JP2013037763A - Led lighting circuit and led lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the brightness of LEDs variable, and protect the LEDs against damage from an excessive temperature rise and an excessive current.SOLUTION: Between power input terminals T1, T2 for inputting an AC power supply and an LED group 142 comprising a plurality of LEDs 411-41n connected in series, a switching circuit section 13 in which a switch 132 can select a capacitor 131 and a short circuit is provided in series with an inductor 12 and a circuit connected with a voltage doubler rectifier circuit section 11. When the switch 132 selects the short circuit, a current flowing to the LED group 142 flows through the short circuit to set up a normal light emission state in which the LED group 142 emits light with normal luminance. When the switch 132 selects the capacitor 131, the current flowing to the LED group 142 flows through the capacitor 131 and decreases accordingly to set up a low luminance light emission state in which the LED group 142 emits light with low luminance.

Description

  The present invention relates to an LED illumination circuit that emits an LED (light emitting diode) from a commercial AC power supply, and an LED illumination device using the LED illumination circuit.

  In recent years, attention has been paid to an illumination circuit (LED illumination circuit) using an LED illumination tube with good luminous efficiency instead of a conventional illumination tube such as an incandescent bulb or a fluorescent tube. An LED is a solid-state element that emits light with a predetermined light emission efficiency in accordance with a current flowing through a pn junction formed on a semiconductor substrate, and it cannot be said that the amount of light emission per LED is large. Therefore, the LED illumination circuit includes a light emitting element unit formed by connecting a large number of LEDs to form a light emitting circuit unit, and emits light having a required light emission amount (luminance). In addition, the LED lighting circuit has a lower maximum application temperature than a solid-state LED or incandescent bulb or fluorescent tube (for example, 80 ° C. or less), and the maximum rated current is not large. Consideration is also required to prevent the LED from being destroyed by the current.

  An LED illumination circuit 100 shown in FIG. 15 is a typical conventional example (see, for example, Patent Document 1). The LED lighting circuit 100 rectifies the AC voltage Ea of the commercial AC power supply ACS by a diode bridge 110 including four diodes 111 to 114, and inputs the rectified voltage to the constant current circuit 120. A constant current is supplied to the light emitting circuit unit 130 including the light emitting element unit 131. A capacitor 140 is connected between the input terminal of the constant current circuit 120 and the output terminal of the light emitting element unit 131, and the rectified voltage by the diode bridge 110 is smoothed. The charging current flowing through the capacitor 140 is concentrated near the peak of the AC voltage, and there is a problem that the inrush current that is the charging current when the power is turned on is large, and countermeasures are desired. The constant current circuit 120 includes a DC circuit system and a switching circuit system. In such an LED lighting circuit 100, although the light emission amount of the light emitting circuit unit 130 is theoretically stable, in the constant current circuit 120, the voltage applied to both ends of the constant current circuit 120 and the light emitting element unit 131 in the DC circuit system. The power loss due to the current flowing through the AC increases in a high voltage region due to the voltage fluctuation of the AC power supply. In such a switching circuit system that can reduce power loss, EMI (electromagnetic interference) is likely to occur due to large high-frequency noise.

  An LED illumination circuit 200 shown in FIG. 16 is an example using a voltage doubler rectifier circuit unit 210 that has been conventionally used in a power supply device or the like (see, for example, Patent Document 2). This LED illumination circuit 200 is not provided with a circuit like the constant current circuit 120, but is provided with a voltage doubler rectifier circuit unit 210 including a first capacitor 211, a second capacitor 212, a first diode 213, and a second diode 214, A current limiting capacitor 220 is provided between the voltage doubler rectifier circuit unit 210 and the commercial AC power supply ACS. The current limiting capacitor 220 is a capacitor for limiting the current flowing through the light emitting circuit unit 230 including the LED group 231. Further, a leveling capacitor 240 for leveling the current flowing through the LED group 231 is connected in parallel with the LED group 231.

The AC voltage Ea of the commercial AC power supply ACS input to the power input terminals T1 and T2 of the LED lighting circuit 200 changes as shown by the waveform shown in the upper part of FIG. 17, and from the commercial AC power supply ACS to the LED lighting circuit 200. The current Ia flowing through the capacitor changes as shown by the waveform shown in the lower part of FIG.
Here, the current Ia shown in the lower part of the figure passes through the current limiting capacitor 220 until the AC voltage Ea reaches the positive peak value (Vp) from the middle of the negative voltage toward the positive direction. The first capacitor 211 flows as a charging current, and also flows as a discharging current from the second capacitor 212 through a current path of the light emitting circuit unit 230 and the first diode 213 in this order. Similarly, the AC voltage Ea flows from the second diode 214 to the second capacitor 212 as a charging current during the period from the positive value toward the negative direction to the negative peak value (−Vp) and emits light. This is a combined current that flows as a discharge current in the current path from the circuit unit 230 and the first capacitor 211 to the current limiting capacitor 220. The phase of the current Ia is approximately 90 degrees ahead of the waveform of the AC voltage Ea of the commercial AC power supply ACS as shown in the lower part of the figure.
Furthermore, since the current limiting capacitor 220 is inserted in series with the voltage doubler rectifier circuit 210, the amplitude of the AC voltage Ea of the commercial AC power supply ACS decreases at the connection portion between the first capacitor 211 and the second capacitor 212. For this reason, it is difficult to supply a sufficiently large direct current for flowing a current to a light emitting element portion formed by connecting a large number of LEDs.

JP 2006-278304 A JP 2008-263203 A

  As described above, the LED lighting circuit 200 using the voltage doubler rectifier circuit 210 that is a current output does not require a circuit that causes wasteful power consumption like the constant current circuit 120, and thus the power consumed by the light emitting circuit unit 230. The efficiency of can be increased. In addition, useless power consumption consumed by the constant current circuit and its peripheral circuits can be omitted.

  However, the capacitor 220 inserted in series between the voltage doubler rectifier circuit 210 and the AC power supply ACS limits the current flowing through the LED group 231. In other words, a high voltage is required to pass a current through an LED group in which a large number of LEDs are connected in series, but the AC voltage drops when the capacitor 220 is inserted, and a sufficiently large DC current is passed. It was difficult.

Further, the LED lighting circuit 200 has a poor power factor. The reason is that the phase of the current Ia flowing from the commercial AC power supply ACS to the LED lighting circuit 200 advances by nearly 90 degrees with respect to the phase of the AC voltage Ea by driving the capacitors 220, 211, 212, and is almost the first half of the positive and negative half cycles. Because it would be only.
Furthermore, since a large current flows in the inrush current when the power is turned on as in the capacitor input method using the diode bridge, it has been desired to take measures to alleviate the peak current.

Further, in the LED illumination circuits described in Patent Documents 1 and 2, the luminance (brightness) of the LED cannot be changed efficiently and easily. In recent years, the development of high brightness LEDs has been promoted, and LEDs that can be sufficiently used for illumination have come to the market. However, it may be desirable to darken the lighting depending on the location, or depending on the situation or time of day. In such a case, the proposal of the technique which can switch the brightness of LED easily was calculated | required.
Further, a protection circuit that prevents the LED from being destroyed by an excessive temperature rise or an excessive current has been desired.

  The present invention has been considered in view of the above circumstances, and can reduce the inrush current, improve the power factor, and easily change the brightness of the LED. It is an object of the present invention to provide an LED lighting circuit and an LED lighting device including a protection circuit that prevents the LED from being destroyed by the current.

  In order to achieve the above object, an LED lighting circuit of the present invention includes a power input terminal for inputting AC power, an inductor, a voltage doubler rectifier circuit for rectifying the AC power, and a plurality of LEDs connected in series. An LED lighting circuit including a light emitting circuit unit including an LED group, a capacitor and a short circuit in series with a circuit in which an inductor and a voltage doubler rectifier circuit unit are connected between a power input terminal and the LED group When the switch selects the short circuit, the current flowing through the LED group flows through the short circuit, and the LED group enters a normal light emitting state where light is emitted at normal luminance. When selected, the current that flows in the LED group flows through the capacitor, and becomes a current that is less than the current that flows in the LED group in the normal light emitting state. , LED group is usually a low luminance light emission state to emit light at a lower luminance than the luminance of the light emitting state configuration.

  In addition, the LED illumination circuit of the present invention includes an abnormality detection unit that detects an abnormality related to the LED group, and when the abnormality detection unit detects an abnormality, the switch selects a capacitor to switch the LED group. The capacitor has switching control means for causing a current to flow through the capacitor, and the capacitor is configured to reduce the current flowing through the LED group by causing the current to flow through the capacitor, thereby causing the LED group to emit light in a low-luminance light emitting state.

  In addition, the LED lighting device of the present invention includes an LED lighting tube having a substrate on which a plurality of LEDs are arranged, and a lighting fixture that supports the LED lighting tube, and the LED lighting tube is attached to the lighting fixture. A lighting fixture socket that engages with the lighting tube socket, and a power input. A lighting fixture side circuit disposed between the terminal and the lighting fixture socket, wherein the LED lighting tube side circuit includes a part of the LED lighting circuit according to any one of claims 1 to 13. The lighting fixture side circuit includes another part of the LED lighting circuit.

According to the LED lighting circuit and the LED lighting device according to the present invention, since the inductor is provided between the power input terminal and the voltage doubler rectifier circuit unit to provide the choke input, the inrush current can be reduced.
In addition, by providing the inductor as described above, in a normal operation state where the LED emits light with normal luminance, the phase of the current flowing through the LED group of the light emitting circuit unit approaches the phase of the AC voltage, and the rest period is shortened. As a result, a high power factor can be obtained.

Further, when the LED emits light with a lower luminance than the normal luminance, when the low luminance light emitting state is set, the switching circuit unit that switches between the low luminance light emitting state and the normal operation state is provided. The brightness of the LED can be changed by switching the part.
Moreover, since an abnormality detection unit that detects an abnormality related to the LED group and a switching control unit that switches a switch to flow a current to the capacitor when the abnormality is detected by the abnormality detection unit, when an abnormality is detected, Since the current flowing through the capacitor is reduced to reduce the current flowing through the LED to obtain a low-luminance light emitting state, the LED can be prevented from being destroyed by an excessive temperature rise or an excessive current.

It is a circuit diagram which shows the structure of the LED illumination circuit which concerns on 1st embodiment of this invention. The waveform of each voltage or electric current in the LED illumination circuit shown in FIG. 1 is shown. It is a circuit diagram which shows the structure of the LED illumination circuit which concerns on 2nd embodiment of this invention. It is an external appearance perspective view which shows the structure of the LED lighting apparatus of this invention. It is a circuit diagram which shows the case where the LED lighting circuit which concerns on 3rd embodiment of this invention is attached to the glow starter type | mold fluorescent lamp lighting fixture. It is a circuit diagram which shows the structure of the lighting fixture side circuit provided in a rapid starter type fluorescent lamp lighting fixture. It is an external appearance perspective view which shows the other structure of the LED lighting apparatus of this invention. It is a circuit diagram which shows the lighting fixture side circuit provided in the rapid starter type | mold fluorescent lamp lighting fixture for 2 lights. It is a circuit diagram which shows the structure of the LED illumination circuit which concerns on 4th embodiment of this invention. It is a circuit diagram which shows the other structure of the LED illumination circuit which concerns on 4th embodiment of this invention. It is a circuit diagram which shows the structure at the time of attaching the LED illumination circuit of FIG. 5 to the LED illumination tube lighting fixture provided with the power supply switching circuit part shown in FIG. It is an external appearance perspective view which shows other structure of the LED lighting apparatus of this invention. It is a circuit diagram which shows the structure of the LED illumination circuit which concerns on 5th embodiment of this invention. It is a circuit diagram which shows the structure of the power supply switching circuit part with which the LED illumination circuit shown in FIG. 13 is equipped. It is a circuit diagram which shows the structure of the conventional LED illumination circuit. It is a circuit diagram which shows the other structure of the conventional LED lighting circuit. It is a wave form diagram which shows the waveform of the voltage Ea and the electric current Ia in the LED illumination circuit shown in FIG.

  Hereinafter, preferred embodiments of an LED lighting circuit and an LED lighting device according to the present invention will be described with reference to the drawings.

[First embodiment of LED lighting circuit]
First, a first embodiment of the LED illumination circuit of the present invention will be described with reference to FIG.
This figure is a circuit diagram showing the configuration of the LED illumination circuit of the present embodiment.
Here, the following items will be described in order.
(1) Configuration of LED lighting circuit (2) Function of inductor (3) Normal lighting and dimmer lighting (4) Voltage and current characteristics of LED lighting circuit

(1) Configuration of LED Lighting Circuit As shown in the figure, the LED lighting circuit 10-1 includes power input terminals T1, T2, a voltage doubler rectifier circuit unit 11, an inductor 12-1, and a switching circuit unit 13-. 1 and the light emitting circuit unit 14-1.
The power input terminals T1 and T2 are input terminals to which the AC voltage Ea of the commercial AC power supply ACS is applied. In the present embodiment, T1 is a first power input terminal and T2 is a second power input terminal.

  The voltage doubler rectifier circuit unit 11 outputs a DC current Ib rectified from the AC power supply Ea input as the AC power supply ACS, and includes a first capacitor 111, a second capacitor 112, a first diode 113, A bridge circuit is configured with the second diode 114. Specifically, one end of the first capacitor 111 and one end of the second capacitor 112 are connected. This connection portion is referred to as a connection portion M1. The first diode 113 has an anode connected to the other end of the first capacitor 111. This connection portion is referred to as a connection portion M2. The cathode of the second diode 114 is connected to the other end of the second capacitor 112. This connecting portion is referred to as a connecting portion M3. The cathode of the first diode 113 and the anode of the second diode 114 are connected. This connecting portion is referred to as a connecting portion M4.

The inductor 12-1 is an electronic component having an inductance component.
The switching circuit unit 13-1 is a circuit for switching the magnitude of the current Ib supplied to the light emitting circuit unit 14-1. Details of the switching circuit unit 13-1 will be described later.
The inductor 12-1 and the switching circuit unit 13-1 are connected in series between the first power supply input terminal T1 and the connection part (input terminal) M1 of the voltage doubler rectifier circuit part 11. Specifically, one end of the inductor 12-1 is connected to the first power input terminal T1, and the other end is connected to one end of the switching circuit unit 13-1. A connection portion between the inductor 12-1 and the switching circuit portion 13-1 is referred to as a connection portion M0. The other end of the switching circuit unit 13-1 is connected to the connection unit M <b> 1 of the voltage doubler rectifier circuit unit 11. And the connection part M4 of the voltage doubler rectifier circuit part 11 is connected to the 2nd power supply input terminal T2.

In FIG. 1, the switching circuit unit 13-1 is connected in series between the inductor 12-1 and the voltage doubler rectifier circuit unit 11, but is not limited thereto. It can be connected in series between the power input terminal T1 and the inductor 12-1. In this case, the switching circuit unit 13-1 has one end connected to the first power input terminal T1 and the other end connected to one end of the inductor 12-1. And the other end of the inductor 12-1 is connected to the connection part M1.
The switching circuit unit 13-1 can be connected in series between the second power input terminal T <b> 2 and the voltage doubler rectifier circuit unit 11. Specifically, one end of the switching circuit unit 13-1 can be connected to the second power input terminal T2, and the other end can be connected to the connection unit M4 of the voltage doubler rectifier circuit unit 11. In this case, one end of the inductor 12-1 is connected to the first power input terminal T <b> 1, and the other end is connected to the connection part M <b> 1 of the voltage doubler rectifier circuit part 11.

Further, in FIG. 1, the inductor 12-1 is connected in series between the first power input terminal T1 and the switching circuit unit 13-1, but is not limited to this. Can be connected in series between the power input terminal T2 and the voltage doubler rectifier circuit unit 11. Specifically, one end of the inductor 12-1 is connected to the second power input terminal T2, and the other end is connected to the connection part M4 of the voltage doubler rectifier circuit part 11. In this case, one end of the switching circuit unit 13-1 is connected to the first power input terminal T 1 and the other end is connected to the connection unit M 1 of the voltage doubler rectifier circuit unit 11.
Further, the inductor 12-1 can be composed of a plurality of inductors and connected in series. That is, the power input terminals T1 and T2, the inductor 12-1, the voltage doubler rectifier circuit unit 11 and the switching circuit unit 13-1 can be connected in series in any order.

The switching circuit unit 13-1 includes a capacitor 131 and a main switch 132. One end of the capacitor 131 is connected to the other end (connection portion M0) of the inductor 12-1, and the other end is connected to the connection portion M1 of the voltage doubler rectifier circuit portion 11. The main switch 132 has a contact terminal connected to one end of the capacitor 131 and a common terminal connected to the other end of the capacitor 131.
In this embodiment, the main switch 132 is a manual changeover switch, but is not limited to a manual changeover switch. For example, the LED group of the light emitting element unit 141 is caused by overcurrent or overheating of the light emitting element unit 141. It can be used as a means for protecting 142 from being destroyed. This configuration will be described in the second and subsequent embodiments.

The light emitting circuit unit 14-1 includes a light emitting element unit 141 provided between the connecting unit M3 and the connecting unit M2, and a light emitting element unit 141 in parallel in order to level the current flowing through the light emitting element unit 141 (that is, , And a leveling capacitor 15 provided between the connection portion M3 and the connection portion M2.
The light emitting element unit 141 includes an LED group 142 in which a plurality of LEDs 411 to 41n are connected in series. The plurality of LEDs 411 to 41n are connected to the cathodes and anodes of the adjacent LEDs 411 to 41n, respectively. The anode of the LED 411 at the start of the LED group 142 is connected to the connection M3, and the cathode of the LED 41n at the end is connected to the connection M2.
In FIG. 1, only one LED group 142 is provided, but the number is not limited to one, and two or more LED groups 142 may be provided and connected in parallel. In this case, the number of LEDs constituting each LED group is the same (n).

(2) Function of Inductor As described above, the inductor 12-1 is connected in series with the voltage doubler rectifier circuit unit 11 between the first power input terminal T1 and the second power input terminal T2. . As a result, the power supply circuit of the LED lighting circuit 10-1 (the circuit portion of the LED lighting circuit 10-1 that receives the commercial AC power supply ACS and supplies power to the light emitting circuit unit 14-1) becomes the choke input method. Inrush current when the AC power source Ea is turned on can be extremely reduced.
For example, as shown in FIG. 15 or FIG. 16, in the LED lighting circuits 100 and 200 having the capacitor input type rectifier circuit, the current for charging the capacitor when the power is turned on, that is, the inrush current is large. The rectifier diode requires a component with a large rated current. Furthermore, in many cases, a lighting device in which many of the same products are connected in parallel on the ceiling of a building is turned on / off by a wall switch for the entire room or floor. If the moment when the switch is turned on is close to the peak value of the AC power supply voltage, an excessive instantaneous current of about ten times or more of the normal current flows, and the contact of the switch progresses and the number of times is shortened. Moreover, adverse effects such as fluctuations in the power supply voltage are exerted on devices connected to the same AC power supply.

  In contrast, the LED lighting circuit 10-1 of the present embodiment includes a voltage doubler rectifier circuit unit 11, a switching circuit unit 13-1, and the like between the first power input terminal T1 and the second power input terminal T2. The inrush current can be extremely reduced by adopting a choke input system in which the inductor 12-1 is connected in series, and by turning on the power when the main switch 132 of the switching circuit unit 13-1 is off. Moreover, the input current from the commercial AC power supply ACS during normal operation has a waveform that is close to the AC voltage, and the current is concentrated only in a specific portion (phase) close to the peak value of the AC voltage waveform, as in the capacitor input method. Never do.

(3) Normal illumination and dimmer illumination In the LED illumination circuit 10-1 shown in FIG. 1, light is emitted by operating the main switch 132 after applying the AC voltage Ea from the commercial AC power supply ACS to the power input terminals T1 and T2. The luminance of the LED group 142 of the element unit 141 can be switched from normal luminance to low luminance and vice versa.

For example, when the common terminal and the contact terminal of the main switch 132 are connected and turned on (turned on), both ends of the capacitor 131 are short-circuited. In this case, the current Ia flows through the shorted main switch 132 and the current Ia does not flow through the capacitor 131 (bypassing the capacitor 131). That is, the inductor 12-1 and the voltage doubler rectifier circuit unit 11 are connected in series between the first power input terminal T1 and the second power input terminal T2. At this time, the current Ic flows through the light emitting element portion 141, and the LED group 142 emits light with normal luminance.
Note that a circuit in which both ends of the capacitor 131 are short-circuited and current flows through the shorted main switch 132 is referred to as a short circuit.
The state in which the LED group 142 emits light with normal luminance is referred to as “normal illumination state” or “normal light emission state”. Furthermore, a state in which the LED illumination circuit 10-1 operates so that the LED group 142 emits light with normal luminance is referred to as a “normal operation state”.

On the other hand, when the common terminal and the contact terminal of the main switch 132 are disconnected and turned off (opened), the circuit in which the short is selected by the main switch 132 is switched to the circuit in which the capacitor 131 is selected, and the current Ia flows through the capacitor 131. . In this case, the inductor 12-1, the capacitor 131, and the voltage doubler rectifier circuit unit 11 are connected in series between the first power input terminal T1 and the second power input terminal T2. The voltage supplied to the connection portion M1 and the connection portion M4, which are input terminals of the voltage doubler rectifier circuit portion 11, is divided by the impedance of the capacitor 131 and the capacitor portion (a parallel circuit of the first capacitor 111 and the second capacitor 112). Since the voltage is reduced, the current Ic supplied to the light emitting element portion 141 is reduced, and the LED group 142 emits light with a luminance lower than the normal luminance. Further, the current Ic at this time is set by the capacitance of the capacitor 131 with respect to the parallel capacitance of the first capacitor 111 and the second capacitor 112 of the voltage doubler rectifier circuit unit 11 (for example, the latter is set to 1/10 with respect to the former). be able to.
A state in which the LED group 142 emits light with a luminance lower than the normal luminance is referred to as a “dimmer illumination state” or a “low luminance light emission state”. In addition, a state in which the LED lighting circuit 10-1 operates so that the LED group 142 emits light with luminance lower than normal luminance is referred to as a “dima operation state”.

  In this way, when the main switch 132 of the switching circuit unit 13-1 is turned on and the short circuit is selected, normal illumination is obtained, and when the main switch 132 is turned off and the capacitor 131 is selected, dimmer illumination with darkened illumination is obtained. That is, the user of the LED illumination circuit 10-1 can switch between normal illumination and dimmer illumination arbitrarily by manually switching the main switch 132 on and off.

  Further, by providing the main switch 132 on the input side of the voltage doubler rectifier circuit unit 11, even if the LED group 142 is disconnected and the path of the current flowing through the LED group 142 is disconnected and the load is lightened, the voltage doubler rectification is performed. The circuit unit 11 is not operated originally, and a high voltage (2 × √2 times the AC voltage) is not output (described later). As a result, the first capacitor 111 and the second capacitor 112 of the voltage doubler rectifier circuit unit 11 do not need to have a high breakdown voltage, and can have a breakdown voltage comparable to that of a normal diode bridge rectifier circuit.

(4) Voltage and Current Characteristics of LED Lighting Circuit The voltage and current characteristics of the LED lighting circuit 10-1 will be described with reference to FIG. The upper waveform in the figure shows the waveform of the AC voltage Ea (broken line) supplied from the commercial AC power supply ACS to the power supply input terminals T1 and T2 and the voltage Eb (solid line) at the connection portion M1. The voltages Ea and Eb are based on the potential of the connection portion M4 of the voltage doubler rectifier circuit portion 11. The middle waveform in the figure shows the waveform of the current Ia supplied from the commercial AC power supply ACS at the first power input terminal T1. The lower waveform in the figure shows the current (discharge current of the first capacitor 111 and the second capacitor 112) Ib (solid line) input to the light emitting circuit unit 14-1 and the current Ic (broken line) flowing in the light emitting element unit 141. The waveform is shown.

In the normal operation state, the rectifier circuit composed of the voltage doubler rectifier circuit unit 11 and the inductor 12-1 is a low impedance circuit because the LED group 142 of the light emitting circuit unit 14-1 as a load is a low impedance circuit, as will be described below. Furthermore, it functions as a circuit that outputs a rectified DC current from the commercial AC power supply ACS to the light emitting circuit unit 14-1.
In the half cycle in which the AC voltage Ea is positive (FIG. 2A), the first capacitor 111 is charged, and at the same time, the charge of the second capacitor 112 charged so far is used as a discharge current to the light emitting circuit unit 14-1. Shed. On the other hand, in the negative half cycle ((b) in the figure), the second capacitor 112 is charged, and at the same time, the load of the first capacitor 111 charged so far is used as a discharge current to the light emitting circuit unit 14-1. Shed.

When the capacitors 111 and 112 are charged, the voltage (Vk) is near the peak voltage (Vp) of the AC voltage Ea supplied from the commercial AC power supply ACS. When the current Ia starts to decrease, the inductor 12-1 Is a counter electromotive force due to the action of maintaining the current Ia, and is obtained as a kick voltage Vk larger than the peak voltage (Vp) of the AC voltage Ea.
In the AC voltage Ea is negative half-cycle, the charge Q _C2 accumulated in the second capacitor 112 before the second capacitor 112 begins to discharge, as shown in equation (1), in negative charge Q _C2 is there.
Q _C2 = C · (−Vk) (1)
In the equation (1), C is a capacitance value of the second capacitor 112. Further, the peak value (−Vk) of the negative kick voltage and the peak value (Vk) of the positive kick voltage depend on the inductance L of the inductor 12-1 and the AC voltage Ea, and the magnitudes of the absolute values thereof. Is larger than the peak value (Vp) of the AC voltage Ea and is proportional to the AC voltage Ea. Since the forward voltage drop due to the second diode 114 is small (about 0.8 V), it is ignored in the expression (1) and the following description. The same applies to the first diode 113.

While the AC voltage Ea rises from the negative peak value, the current Ia supplied from the commercial AC power supply ACS becomes zero, and the voltage at the connection M3 rises to n · Vd after the rest period Ts. The second capacitor 112 starts discharging from the time when it reaches. Here, n is the number of LEDs constituting the LED group 142 of the light emitting element unit 141, and Vd is the forward voltage drop of the LEDs. As this voltage increases, the discharge start timing of the second capacitor 112 is delayed.
Discharge current Ib of the second capacitor 112 while discharging the electric charge _{Q C2} of the second capacitor 112 is accumulated, the connecting portion M3 from the second capacitor 112, the light emitting circuit section 14-1, the connection portion M2, the first diode 113, It continues to flow through the current path in the order of the second power input terminal T2 and the current path in the order of the inductor 12-1, the switching circuit unit 13-1, and the second capacitor 112 from the first power input terminal T1. On the other hand, the first capacitor 111 continues to be charged while the voltage Eb of the connection portion M1 increases. The sum of the discharge current Ib of the second capacitor 112 and the charging current of the first capacitor 111 is the current Ia supplied from the commercial AC power supply ACS.

When the AC voltage Ea approaches the positive peak value (Vp) and the absolute value of the current Ia supplied from the commercial AC power supply ACS and flowing through the inductor 12-1 starts to decrease, the current Ia is generated by the counter electromotive force of the inductor 12-1. A positive kick voltage is generated by the action to maintain the voltage, and the voltage Eb of the connection portion M1 rises. Then, the voltage Eb of the connection portion M1 reaches the positive peak value (Vk) until the discharge current Ib of the second capacitor 112 disappears and the current Ia becomes zero. At this time, the second capacitor 112 accumulates a positive charge Q _D2 on the connection portion M1 side as shown in the following equation (2).
Q _D2 = C · (Vk−n · Vd) (2)
The first capacitor 111, as shown in (1 ') below, to accumulate positive charge Q _C1 in accordance with the positive peak value of the voltage Eb of the connection part M1 (Vk) to the connection portion M1 side .
Q _C1 = C · Vk (1 ')
In the equation (1 ′), C is a capacitance value of the first capacitor 111 and is the same value as the capacitance value of the second capacitor 112.

While the AC voltage Ea is decreasing in the negative direction from the positive peak value, the current Ia supplied from the commercial AC power supply ACS becomes zero, and after the rest period Ts, the voltage at the connection portion M2 decreases. The first capacitor 111 starts discharging from the point of time when −n · Vd is reached. A period from when the current Ia becomes zero to when discharge is started is referred to as a rest period Ts. Discharge current Ib of the first capacitor 111, while discharging the electric charge _{Q C1} of the first capacitor 111 is stored, the switching circuit 13-1 from the first capacitor 111, an inductor 12-1, a first power supply terminal T1 It continues to flow through the forward current path and the forward current path from the second power input terminal T2 to the second diode 114, the connection portion M3, the light emitting circuit portion 14-1, the connection portion M2, and the first capacitor 111. On the other hand, the second capacitor 112 continues to be charged while the voltage Eb at the connection portion M1 drops. The sum of the discharge current Ib of the first capacitor 111 and the charging current of the second capacitor 112 is the current Ia supplied from the commercial AC power supply ACS.

When the AC voltage Ea approaches the negative peak value (−Vp) and the absolute value of the current Ia flowing through the inductor 12-1 starts to decrease, the current Ia is maintained by the counter electromotive force of the inductor 12-1. A negative kick voltage is generated, and the voltage Eb at the connection M1 drops. Then, the voltage Eb of the connection portion M1 reaches the negative peak value (−Vk) until the discharge current Ib of the first capacitor 111 disappears and the current Ia becomes zero. At this time, the first capacitor 111 accumulates a negative charge Q _D1 on the connection portion M1 side as shown in the following equation (2 ′).
Q _D1 = C · (n · Vd−Vk) (2 ′)
The second capacitor 112, as shown in the above (1), and accumulates the negative peak value of the voltage Eb of the connecting portion M1 a negative charge _{Q C2} corresponding to (-Vk) to the connection portion M1 side Will be.

  In this way, in the light emitting circuit unit 14-1, the discharge current Ib generated by the first capacitor 111 and the second capacitor 112 is supplied to the voltage doubler rectifier circuit unit via the inductor 12-1, as shown in the lower part of FIG. 11 alternately flows according to the alternating voltage Ea applied to the terminal 11. That is, the discharge current Ib by the second capacitor 112 flows in most of the period from the first half to the latter half of the period in which the AC voltage Ea is a positive value, and the first half to the latter half of the period in which the AC voltage Ea is a negative value. During most of the period, the discharge current Ib from the first capacitor 111 flows. As shown in the middle part of FIG. 2, the phase of the current Ia, which is the sum of the discharge current Ib and the charging current, approaches the phase of the AC voltage Ea, and the rest period Ts becomes very short, resulting in a high power factor. Can be obtained.

The reason why the suspension period Ts shown in the middle part of FIG. 2 is shorter than the suspension period Ts ′ shown in the lower part of FIG. 17 will be further described.
When the voltage Ea of the AC power supply ACS goes from negative to positive, the current Ia (of the charging current to the capacitor 111 and the discharging current Ib to the light emitting element portion 141 through the capacitor 112) passes through the inductor 12-1. A current delayed by about 90 degrees flows (due to the integral action of the inductor) from the current phase in the lower stage of FIG. 17 which is a current when there is no inductor. When the aforementioned combined current Ia starts to decrease as the AC voltage Ea reaches the positive peak voltage Vp, the inductor 12-1 releases current to continue the charged current. That is, when the AC voltage Ea of the AC power supply ACS reaches the peak voltage, the current when the inductor 12-1 is not present (the lower stage in FIG. 17) becomes zero, but the current when the inductor 12-1 is present (FIG. 2). In the middle stage, the current Ia is continued by discharging the current charged in the inductor 12-1, so that the pause period is shortened.

In a normal lighting state, in order to obtain a higher power factor, the combined capacitance value of the first capacitor 111 and the second capacitor 112 so that the phase of the AC voltage Ea of the AC power supply ACS and the current Ia flowing through the LED lighting circuit are close to each other. It is preferable to set (2C) and the inductance L of the inductor 12-1. When the voltage n · Vd between the connecting portions M2 and M3 is small, the reactance at the time of series resonance is canceled at the frequency F (angular frequency ω) of the AC voltage Ea. Since the voltage n · Vd between them is large, as described above, the discharge start timing of the second capacitor 112 or the first capacitor 111 is delayed, and during this time, the current Ia is delayed. As described above, the reactance of the inductance L is adjusted to be smaller than the reactance of the capacitor 2C.
ωL ≦ 1 / ω (2C) (3)

As shown in the lower part of FIG. 2, the current Ib input to the light emitting circuit unit 14-1 is leveled by the leveling capacitor 15 and becomes the current Ic flowing through the light emitting element unit 141. The average currents of the current Ib and the current Ic are the same. The average current of the current Ic (current Ib) is expressed by the following equation (4): charge transfer (Q _C1 -Q _D1 ) and (Q _C2 -Q _D2 ) that occur during one period (1 / F) ).
Ic = 2F · C · (2Vk−n · Vd) (4)
Since the kick voltage Vk in the equation (4) is proportional to the AC voltage Ea, it can be replaced with an equation (α · Ea) multiplied by a constant α. For this reason, the current Ic can be easily adjusted by the capacitance values C of the first capacitor 111 and the second capacitor 112.

[Second Embodiment of LED Lighting Circuit]
Next, 2nd embodiment of the LED lighting circuit of this invention is described with reference to FIG.
This figure is a circuit diagram showing the configuration of the LED illumination circuit of the present embodiment.
Compared with the first embodiment, the present embodiment provides a current supplied to the light emitting element portion in order to prevent the LED from being destroyed when an overcurrent, overheating, disconnection or short circuit occurs in the light emitting element portion. The difference is that a switching circuit unit for switching and a protection circuit for controlling on / off of the switching circuit unit are provided. Other components are the same as those in the first embodiment.
Therefore, in FIG. 3, the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

Here, the following items will be described in order.
(1) Configuration of LED lighting circuit (2) Operation of LED lighting circuit

(1) Configuration of LED Lighting Circuit As shown in FIG. 3, the LED lighting circuit 10-2 includes power input terminals T1 and T2, a voltage doubler rectifier circuit unit 11, an inductor 12-1, and a switching circuit unit 13-. 2 and the light emitting circuit unit 14-2.
Here, the configuration of the light emitting circuit unit 14-2 will be described first, and then the configuration of the switching circuit unit 13-2 will be described.

The light emitting circuit unit 14-2 includes a light emitting element unit 141 and a protection circuit 17.
The light emitting element 141, as shown in the figure, a plurality of LED411~41n is an LED group 142 ₁ connected in series, a plurality of LED421~42n is an LED group 142 ₂ connected in series, connected in parallel Has been. The number of LED421~42n constituting the number of LED411~41n constituting these LED group 142 _1, the LED group 142 ₂ are the same (n).
In the figure, two LED groups are connected in parallel. However, the number of LED groups is not limited to two, and three or more LED groups may be provided and connected in parallel. In this case, the number of LEDs constituting each LED group is the same (n).

As shown in the figure, the protection circuit 17 includes a constant voltage generation unit 171, a first reference voltage generation unit 172, an overcurrent detection unit 173, an overheat detection unit 174, a latch circuit unit 175, and a driver unit 176. And a leveling capacitor 15 and a varistor 16.
The constant voltage generation unit 171 includes a resistor R11, a Zener diode Z11, and a capacitor C11.
The resistor R11 and the Zener diode Z11 are connected in series between the connection part M3 and the connection part M2 of the voltage doubler rectifier circuit part 11. Specifically, one end of the resistor R11 is connected to the connection portion M3 of the voltage doubler rectifier circuit portion 11 (that is, the input terminal M5 of the light emitting element portion 141), and the other end is connected to the cathode of the Zener diode Z11. The anode of the Zener diode Z11 is connected to the connection part M2 of the voltage doubler rectifier circuit part 11.
One end of the capacitor C11 is connected to the connection portion M6 between the resistor R11 and the Zener diode Z11, and the other end is connected to the connection portion M2 of the voltage doubler rectifier circuit portion 11.

  The first reference voltage generator 172 includes a resistor R21, a resistor R22, a transistor Q21, and a resistor R23. One end of the resistor R21 is connected to the connecting portion M6 (the output terminal of the constant voltage generating portion 171), and the other end is connected to one end of the resistor R22. The other end of the resistor R22 is connected to the connection M2 of the voltage doubler rectifier circuit unit 11. The transistor Q21 has a base connected to the connection portion M8 between the resistors R21 and R22 and a negative input terminal (described later) of the amplifier AMP51, a collector connected to the connection portion M6, an emitter connected to one end of the resistor R23, and the transistors Q31 and Q32. Connected to each emitter (described later). The other end of the resistor R23 is connected to the connection portion M2 of the voltage doubler rectifier circuit portion 11. A portion where the emitter of the transistor Q21 and each emitter of the transistors Q31 and Q32 are connected is defined as an overcurrent comparison terminal M9.

The overcurrent detection unit 173 includes a resistor R31, a resistor R32, a transistor Q31, and a transistor Q32.
Specifically, the resistance R31, one end connected to the LED group 142 ₁ of end terminals (cathode of LED41n), the other end is connected to the connection portion M2 of the voltage doubler rectifier circuit 11. Resistor R32 has one end connected to the end terminal of the LED group 142 ₂ (cathode of LED42n), the other end is connected to the connection portion M2 of the voltage doubler rectifier circuit 11. The transistor Q31 has a base connected to one end of the resistor R31, a collector connected to an OR circuit connection unit M10 (described later), and an emitter connected to an overcurrent comparison terminal M9. The transistor Q32 has a base connected to one end of the resistor R32, a collector connected to an OR circuit connection unit M10 (described later), and an emitter connected to an overcurrent comparison terminal M9.

  Further, the transistor Q31 and the transistor Q21 constitute a differential amplifier circuit that compares the first reference voltage and the voltage drop across the resistor R31 by using the collector of the transistor Q31 as an output. Further, the transistor Q32 and the transistor Q21 constitute a differential amplifier circuit that compares the first reference voltage and the voltage drop across the resistor R32 using the collector of the transistor Q32 as an output.

The overheat detection unit 174 includes a resistor R41, a resistor R42, a resistor R43, a transistor Q41, and a diode D41.
Specifically, the resistor R41 has one end connected to the connection portion M6 and the other end connected to one end of the resistor R42. The other end of the resistor R42 is connected to the connection M2 of the voltage doubler rectifier circuit unit 11. The transistor Q41 has a base connected to the connection portion between the resistors R41 and R42, a collector connected to the connection portion M6 via the resistor R43, and an emitter connected to the connection portion M2 of the voltage doubler rectifier circuit portion 11. . The diode D41 has a cathode connected to a connection portion between the collector of the transistor Q41 and the resistor R43, and an anode connected to an OR circuit connection portion M10 (described later).
The transistor Q41 is provided at a position in contact with or close to any of the LEDs 411 to 41n, the LEDs 421 to 42n, and the varistor 16, and the LEDs 411 to 41n, the LEDs 421 to 42n, and the varistor 16 are overheated. Is detected. The details of the operation related to this detection will be described in detail in “(2) Operation of LED illumination circuit” described later.

  The latch circuit unit 175 includes a resistor R51, a capacitor C51, and an amplifier AMP51. Specifically, the resistor R51 has one end connected to the connection unit M6 and the other end connected to the positive input terminal of the amplifier AMP51. The capacitor C51 has one end connected to the output terminal of the amplifier AMP51 and the other end connected to the positive input terminal of the amplifier AMP51. The amplifier AMP51 has a negative input terminal connected to the base of the transistor Q21 of the first reference voltage generation unit 172, and an output terminal connected to one end of the capacitor C51 and one end of a resistor R61 (described later) of the driver unit 176. . That is, the latch circuit unit 175 constitutes a monostable multivibrator by the resistor R51, the capacitor C51, and the amplifier AMP51. A connection portion where the positive input terminal of the amplifier AMP51, the other end of the resistor R51, and the other end of the capacitor C51 are connected is referred to as an OR circuit connection portion M10.

  The driver unit 176 includes a resistor R61, a resistor R62, a resistor R63, a resistor R64, a capacitor C61, and an amplifier AMP61. Specifically, one end of the resistor R61 is connected to the output terminal of the amplifier AMP51 of the latch circuit unit 175, and the other end is connected to the positive input terminal of the amplifier AMP61. The resistor R62 has one end connected to the positive input terminal of the amplifier AMP61 and the other end connected to the connection M2 of the voltage doubler rectifier circuit unit 11. The resistor R63 has one end connected to the positive input terminal of the amplifier AMP61 and the other end connected to an output terminal of the amplifier AMP61 and one end of a resistor 136 (described later) of the switching circuit unit 13-2. The resistor R64 has one end connected to the output terminal of the amplifier AMP61 and the other end connected to the negative input terminal of the amplifier AMP61. The capacitor C61 has one end connected to the negative input terminal of the amplifier AMP61 and the other end connected to the connection M2 of the voltage doubler rectifier circuit unit 11. Note that the power supply of the amplifier AMP51 of the latch circuit unit 175 and the power supply of the amplifier AMP61 of the driver unit 176 are both supplied from the constant voltage Ec of the constant voltage generation unit 171.

  In other words, this configuration is as follows. An integration delay circuit divided by a resistor R64 and a capacitor C61 is connected as a negative feedback circuit from the output terminal to the negative input terminal of the amplifier AMP61. The positive input terminal of the amplifier AMP61 is connected, as a positive feedback circuit, through a resistor R63, and a connection portion obtained by dividing the output of the latch circuit portion 175 by the resistors R61 and R62. With this configuration, the driver unit 176 forms an astable multivibrator (ASTABLE MULTIVIBRATOR). Note that the output terminal of the amplifier AMP61 is referred to as an output terminal M11 of the driver unit 176.

  The varistor 16 is connected in parallel to the leveling capacitor 15 between the connection part M3 and the connection part M2 of the voltage doubler rectifier circuit part 11.

The switching circuit unit 13-2 includes both terminals of the inductor 12-1 and the input terminal M1 and the connection unit M4 of the voltage doubler rectifier circuit unit 11 between the first power input terminal T1 and the second power input terminal T2. And connected in series.
The switching circuit unit 13-2 includes a capacitor 131, a main switch 132 ′ that is a triac, a light transmission element 133, a dimmer switch 134, a dimmer display LED 135, and a resistor 136.
Specifically, one end of the capacitor 131 is connected to the other end of the inductor 12-1, and the other end is connected to the connection portion M 1 of the voltage doubler rectifier circuit portion 11. In the triac that is the main switch 132 ′, the T2 terminal is connected to the other end of the inductor 12-1, the T1 terminal is connected to the connection part M 1 of the voltage doubler rectifier circuit unit 11, and the gate is the light receiving part 133 of the light transmission element 133. ₂ (described later). Light transmitting element 133, and a light receiving portion 133 ₂ is a light emitting portion 133 ₁ and the triac is a light emitting diode, an anode of the light emitting diode is connected to the x contacts the dimmer switch 134 and a cathode of the voltage doubler rectifier circuit 11 Connected to the connection portion M2, the T1 terminal of the triac is connected to the gate of the main switch 132 ′, and the T2 terminal is connected to the T2 terminal of the main switch 132 ′. The dimmer switch 134 is a manual changeover switch that switches between two contacts (x contact, y contact), and the y contact is connected to the anode of the dimmer display LED 135. The cathode of the dimmer display LED 135 is connected to the connection portion M <b> 2 of the voltage doubler rectifier circuit portion 11. One end of the resistor 136 is connected to the other end of the resistor R63 of the driver unit 176, and the other end is connected to the common terminal of the dimmer switch 134.

(2) Operation of LED Lighting Circuit The operation of the LED lighting circuit 10-2 will be described with reference to FIG.
Here, the following items will be described in order.
(2-1) Function and operation of each component of protection circuit 17 (2-2) Function and operation of each component of switching circuit unit 13-2 (2-3) When dimmer switch 134 is connected to x contact (2-4) Operation when the dimmer switch 134 is connected to the y contact

(2-1) Function and Operation of Each Part of Protection Circuit 17 Here, the function and operation of each part constituting protection circuit 17 will be described.
In the following description, “normal operation” refers to the operation of the LED lighting circuit 10-2 when the LED group 142 ₁ and the LED group 142 ₂ of the light emitting element unit 141 emit light with normal luminance. The “dimming operation” refers to the operation of the LED illumination circuit 10-2 when the LED group 142 ₁ and the LED group 142 ₂ emit light with a luminance lower than that emitted in “normal operation”.

The constant voltage generation unit 171 divides the voltage from the connection unit M3 of the voltage doubler rectifier circuit unit 11 by the resistor R11 and the Zener diode Z11 in which the capacitor C11 is connected in parallel, and the resistor R11, the Zener diode Z11, and the capacitor The constant voltage Ec generated at the connection M6 with C11 is output.
Note that the constant voltage generator 171 supplied as the power source of the amplifier AMP61 generates the constant voltage Ec with a small current (for example, 1 mA) passing through the resistor R11 from the output terminal M3 of the voltage doubler rectifier circuit unit 11. By connecting a capacitor C11 in parallel with the Zener diode Z11 that obtains the constant voltage Ec, a 10 mA pulse current is caused to flow from the output terminal of the amplifier AMP61 through the resistor 136, as will be described later, by the charge accumulated in the capacitor C11. Can do.

  The first reference voltage generation unit 172 divides the constant voltage Ec from the constant voltage generation unit 171 (resistance division) by the resistors R21 and R22 connected in series. The voltage generated at the connection M8 between the resistor R21 and the resistor R22 due to this voltage division is input to the base of the transistor Q21 as the first reference voltage that sets the upper limit of the current. The emitter voltage of the transistor Q21 is supplied to the emitters of the transistors Q31 and Q32 of the overcurrent detection unit 173 via the overcurrent comparison terminal M9.

Overcurrent detection unit 173, a voltage drop generated in the resistor R31 (comparison voltage generating unit) by the current from the LED group 142 ₁ is input to the base of the transistor Q31 (voltage comparator), the first reference voltage generator 172 The first reference voltage (current upper limit set voltage) is compared. Further, the voltage drop occurring in the resistor R32 (comparison voltage generating unit) by the current from the LED group 142 ₂ input to the base of the transistor Q32 (voltage comparator), a first reference voltage of the first reference voltage generator 172 and Compare
Here, when the LED group 142 ₁ and 142 ₂ to the normal current (current flowing in the normal operation state) is flowing in the transistors Q31, Q32, because the base voltage is lower than the emitter voltage, the collector - emitter Current does not flow. Therefore, the potential of the OR circuit connection unit M10 to which the collectors of the transistors Q31 and Q32 are connected is maintained at a high level, and the potential of the positive input terminal of the amplifier AMP51 of the latch circuit unit 175 to which the OR circuit connection unit M10 is connected is A high level signal is output from the output terminal of the amplifier AMP 51 to the driver unit 176 while maintaining the high level. The subsequent operation will be described in detail in the description of the driver unit 176.

In contrast, LED group 142 ₁ or 142 ₂ of one of the columns in the overcurrent (predetermined reference value (e.g., 1.2 times the normal) than the current) when the flow is a resistor R31 or the resistor R32 The generated voltage drop becomes high, and in the transistor Q31 or the transistor Q32, the base voltage becomes higher than the first reference voltage, and a current flows between the collector and the emitter. Accordingly, when the potential of the OR circuit connection unit M10 is pulled to a low level (lowered to a low level), the latch circuit unit 175 is triggered (the potential of the positive input terminal of the amplifier AMP51 is decreased to a low level). The output terminal of the amplifier AMP51 is also at a low level. As a result, the oscillation of the driver unit 176 is stopped and the output is also at a low level, the main switch 132 ′ is turned off, the current Ic supplied to the light emitting element unit 141 is decreased, and the dimmer illumination is switched.

The resistors R31 and R32 convert the current flowing through the LED group 142 into a voltage, and thus have a function as a “comparison voltage generator”.
The transistors Q31 and Q32 compare the comparison voltage from the comparison voltage generator (resistor R31, resistor R32) with the first reference voltage from the first reference voltage generator 172, and the comparison voltage is the first reference voltage. If the overcurrent is detected, a predetermined voltage is applied to the switching control means (a circuit portion constituted by the light transmission element 133, the dimmer switch 134, the dimmer display LED 135, and the resistor 136 of the switching circuit 13-2). Therefore, it has a function as a “voltage comparison unit”.

The overheat detection unit 174 divides the constant voltage Ec output from the constant voltage generation unit 171 by a resistor R41 and a resistor R42 provided between the connection unit M6 and the connection unit M2 of the constant voltage generation unit 171 (resistance division). To do. The voltage generated between the resistors R41 and R42 is input to the base of the transistor Q41 as the second reference voltage.
The second reference voltage is set to a base-emitter voltage Vbe (for example, about 0.40 V) when a collector current of the transistor Q41 at a predetermined temperature flows through a predetermined amount (for example, about 100 μA).
The resistor R41 and the resistor R42 provide a second reference voltage to the base of the transistor Q41 (temperature detection transistor), and thus constitute a “reference voltage generation unit”.

The transistor Q41 is a temperature detecting transistor, and for example, an NPN bipolar transistor can be used. The transistor Q41 is disposed at an appropriate position where the temperatures of the LEDs 411 to 41n and 421 to 42n can be detected, such as the vicinity of the LEDs 411 to 41n and 421 to 42n constituting the LED groups 142 ₁ and 142 ₂ .
When the transistor Q41 reaches a predetermined temperature or higher, the collector current starts to flow from the connection portion M6 of the constant voltage Ec through the resistor R43. When the collector current reaches a predetermined current value (for example, about 100 μA), the voltage of the OR circuit connection unit M10 is equal to the predetermined voltage applied to the negative input terminal of the amplifier AMP51 of the latch circuit unit 175. It has become. That is, the resistance values of the resistor R51 and the resistor R43 are set so that the latch circuit portion 175 is triggered when the collector current of the transistor Q41 flowing from the connection portion M6 of the constant voltage Ec through the resistor R43 reaches a predetermined current. ing.

The latch circuit unit 175 has a predetermined bias voltage (a first reference voltage from the first reference voltage generation unit 172 in FIG. 3) applied to a negative input terminal (an input terminal where the polarity of the output terminal is inverted) of the amplifier AMP51. ), A capacitor C51 is connected between the positive input terminal connected to the OR circuit connection part M10 (an input terminal where the polarity of the output terminal is not inverted) and the output terminal, and a connection part M6 between the positive input terminal and the constant voltage Ec. A monostable multivibrator is configured in which a resistor R51 is connected between them.
The latch circuit unit 175 latches the trigger signal. For example, if the potential of the positive input terminal of the amplifier AMP51 is high level during normal operation, the potential of the output terminal also becomes high level, the driver unit 176 oscillates, and sends a rectangular wave signal to the switching circuit unit 13-2. The main switch 132 ′ is turned on and normal illumination is obtained. In contrast, an abnormality is detected by the overcurrent detection unit 173 or the overheat detection unit 174, the potential of the OR circuit connection unit M10 is pulled to a low level (lowered), and the potential of the positive input terminal of the amplifier AMP51 is negative. When the voltage is lower than the reference voltage (which is a predetermined voltage) connected to the input terminal, the output terminal of the amplifier AMP51 becomes low level, the positive input terminal is pulled to low level through the capacitor C51, positive feedback is applied, and the output terminal is low. Temporarily stabilizes at level. At this time, the oscillation of the driver unit 176 stops, the main switch 132 ′ of the switching circuit unit 13-2 is turned off, and the current Ib supplied from the voltage doubler rectifier circuit unit 11 is reduced through the capacitor 131. Switch to. The light emitting element unit 141 becomes dimmer illumination by the reduced current Ib, and the output voltage Ec of the constant voltage generation unit 171 is maintained.

  When the overcurrent detection unit 173 or the overheat detection unit 174 does not detect the abnormality and the OR circuit connection unit M10 is not pulled to a low level, the positive input terminal of the amplifier AMP51 charges the capacitor C51 through the resistor R51 in the positive direction. When the voltage rises above the reference voltage, the output terminal operates as a monostable multivibrator that returns to a high level. In such an operation, for example, when overheating is detected and the main switch 132 ′ is turned off, the current Ic flowing through the light emitting element portion 141 decreases, the temperature decreases, and overheating is not detected, and the OR circuit connection portion M10. Is not pulled to the low level, the main switch 132 'is turned on again after the time constant determined by the resistor R51 and the capacitor C51 from that point in time to return to the normal illumination state. By this method, normal lighting and dimmer lighting are alternately turned on and displayed in an abnormal state, and damage is prevented as long as the current flowing through the light emitting element portion 141 and the temperature rise due to heat generation do not exceed each set value as an average value. While maintaining normal lighting.

In the present embodiment, the latch circuit unit 175 constitutes a monostable multivibrator. For example, the latch circuit unit 175 constitutes a bistable multivibrator by replacing the capacitor C51 with a resistor R52 (not shown). be able to. In this case, the resistance value of the resistor R52 is set so that the voltage at the positive input terminal divided by the resistor R52 and the resistor R51 is equal to or lower than the first reference voltage when the output terminal of the amplifier AMP51 becomes low level. . When the potential of the OR circuit connection portion M10 is pulled to a low level (the potential of the OR circuit connection portion M10 is lowered to a low level) and the positive input terminal becomes equal to or lower than the first reference voltage, the output terminal becomes a low level, and the OR The circuit connection M10 is pulled to a low level, and the output terminal of the amplifier AMP51 is stabilized at a low level. As a result, the oscillation of the driver unit 176 is stopped and the main switch 132 ′ is kept off.
This method can be used as a countermeasure when an overcurrent or overheat is detected in the light emitting element portion 141. That is, when such an abnormality is detected, an environment in which the use environment of the LED illumination circuit 10-2 is inconvenient for the LED illumination circuit 10-2 (for example, an AC voltage Ea having a very high voltage value is supplied. As a countermeasure for this, the dimmer illumination state in which the reduced current Ic flows to the light emitting element portion 141 is maintained, thereby preventing the LED from being damaged.

  The driver unit 176 drives the switching circuit unit 13-2 on and off. That is, the driver unit 176 sends a pulse current that is oscillated when the output of the latch circuit unit 175 is at a high level and is subjected to positive duty control to the switching circuit unit 13-2, and keeps the main switch 132 ′ on. Maintain normal lighting. As described above, the driver unit 176 forms an astable multivibrator.

  When the output of the latch circuit unit 175 becomes high level, the bias voltage divided by the resistors R61, R62, and R63 is applied to the positive input terminal of the amplifier AMP61 and becomes higher level than the negative input terminal, so that the output terminal M11 is high. Become a level. At that time, the voltage at the negative input terminal rises in the positive direction from the output terminal M11 to the integrating circuit of the resistor R64 and the capacitor C61. When the voltage at the negative input terminal becomes higher than that at the positive input terminal, the output terminal M11 is inverted and becomes low level. As a result, the voltage at the positive input terminal, which is the voltage dividing point of the resistors R61 and R62, is reduced through the resistor R63 (positive feedback is applied). Since the negative input terminal is at the high level and the output terminal M11 is at the low level, the voltage of the capacitor C61 discharges and drops through the resistor R64, and the output terminal M11 is inverted when the negative input terminal is at a lower level than the voltage of the positive input terminal. As a result, the voltage at the positive input terminal, which is the voltage dividing point of the resistors R61 and R62, is increased through the resistor R63 (positive feedback is applied). By such backlash characteristics, inversion is repeated and switched, and the output terminal M11 of the driver unit 176 outputs a rectangular wave. When the output of the latch circuit unit 175 is at a low level, the circuit configuration is such that the voltage at the positive input terminal is lower than the voltage at the negative input terminal of the amplifier AMP61 (not shown). The output terminal is at a low level (for example, there is a method of applying a positive bias voltage to the negative input terminal through a resistor).

(2-2) Configuration and Operation of Each Unit of Switching Circuit Unit 13-2 Here, among the operations of switching circuit unit 13-2, the function and operation of main switch 132 ′ and the function and operation of optical transmission element 133 Will be described.

(2-21) Function and operation of main switch 132 'The triac, which is the main switch 132', is in an off state in which no current is conducted between the T1 terminal and the T2 terminal when no current flows through the gate. When a predetermined amount of current flows through the gate, the T1 terminal and the T2 terminal are turned on. However, there is a characteristic in which an alternating current flows between the T1 terminal and the T2 terminal in the on state and the polarity of the current is reversed, that is, when the current becomes zero, the current is turned off and the current does not flow. . Such a state occurs when the current Ia shown in the middle stage of FIG. 2 becomes zero. Since a reverse polarity current begins to flow after the rest period Ts, it is necessary to trigger the main switch 132 ′ at that time (a predetermined amount of current flows through the gate). This trigger will be described in detail later in “(2-22) Function and operation of light transmission element 133”.

The main switch 132 ′ is obtained by replacing the main switch 132 of the switching circuit unit 13-1 in the first embodiment with a main switch 132 ′ using a triac. To OFF control of the main switch 132 ', the light receiving portion 133 ₂ of the optical transmission element 133, its gate, is connected between the terminal T2.

(2-22) Function and Operation of Light Transmission Element 133 The light transmission element 133 is a signal transmission element that switches the main switch 132 ′ based on a rectangular wave signal from the driver unit 176. The optical transmission device 133 includes a light emitting portion 133 ₁ that emit light when receiving a square wave signal of a high level (high level), receiving the electric current to the gate of the receiving light main switch 132 'from the light emitting unit 133 ₁ and a part 133 _2. By thus emitting portion 133 ₁ and the light receiving portion 133 ₂ is provided with a light transmitting element 133 isolated (insulated), in accordance with the rectangular wave signal of a direct current, it is possible to turn on and off the main switch 132 'for the AC .

For example, a phototriac coupler can be used as the light transmission element 133. Photo-triac coupler is provided with a light-emitting diode as a light emitting unit 133 _1, a photocoupler provided with a triac as the light receiving unit 133 _2. This phototriac coupler can be operated by intermittent driving described below.
To keep the always-on state of the main switch 132 'to the AC voltage Ea is made to turn on the light receiving portion 133 ₂ of the photo-triac coupler, in this case, electric current of about 10mA to the light emitting unit 133 ₁ There is a need. However, when the power consumption required to supply this current is converted into the input power of the AC power source, the power consumption is about 1 W when the AC power source is 100 VAC, for example. However, since this 1 W power consumption is too large for a 10 W lighting fixture, the output of the driver unit 176 is made a pulse train for duty control to reduce the power consumption. Specifically, for example, if the output of the amplifier AMP61 is set to a high level for 10 μsec and flows for about 10 mA and then is not set to a low level for 90 μsec and no current is supplied, 1/10 intermittent control (DUTY CONTROL) drive. Even if the main switch 132 ′ is turned off when the trigger current becomes 0, the trigger is triggered at least after 90 μsec. Although the power consumption required for this trigger is reduced to 1/10 here, the power consumption can be reduced to 1/20 if the intermittent drive ratio is 1/20. In this way, in order to make the high level period of the trigger signal shorter than the low level period, it is sufficient that the rising edge is fast and the falling edge is late at the negative input terminal of the amplifier AMP61, so that the voltage is divided by the resistors R61 and R62. It can be obtained by lowering the voltage of the positive input terminal. For example, to set the period during which the output of the amplifier AMP61 is at a low level (assuming 0V) to 90 μsec, the ratio of the voltage when the positive input terminal is low to the voltage when the positive input terminal is high is about 0.37. If there is, it can be obtained by setting the time constant by the resistor R64 and the capacitor C61 to about 90 μsec.

In the present embodiment, a phototriac coupler is employed as the light transmission element 133. However, the light transmission element 133 is not limited to a phototriac coupler, and, for example, a MOS photo relay (not shown) is employed. You can also. Different from the of these photo-triac coupler and MOS photo relay, using the former, whereas the using switch as the light receiving portion 133 _{and second} output side, the latter, the MOSFET is a resistance variation element as the light receiving unit 133 ₂ It is in place. However, in either case, the main switch 132 ′ can be turned on / off by connecting between the gate and the T2 terminal of the main switch 132 ′ and passing a current between the gate and the T2 terminal.

  In the above description, the light transmission element 133 has been described as having a characteristic in which the normal state is off, such as a phototriac coupler. However, the present invention is not limited to this. For example, the normal state is in the on state. It is also possible to employ a switch having the above characteristics. In the latter case, the circuit configuration is such that the signal is inverted.

  Further, in addition to the main switch 132 ′ and the light transmission element 133, the switching circuit unit 13-2 displays a dimmer display LED 135 that displays the dimmer illumination state by lighting, and a resistor 136 that determines an output current of the driver unit 176. And a dimmer switch 134 for switching the output current to flow to the light transmission element 133 side or the dimmer display LED 135 side. The functions and operations of the dimmer display LED 135, the dimmer switch 134, and the resistor 136 will be described in "(2-3) When the dimmer switch 134 is connected to the x contact" and "(2-4) Dima switch". This will be described in detail in “When 134 is Connected to Y-Contact”.

(2-3) When the dimmer switch 134 is connected to the x contact Here, the dimmer switch 134 is connected to the x contact, and both the overcurrent detection unit 173 and the overheat detection unit 174 are abnormal. The operation of the LED lighting circuit 10-2 when no signal is detected will be described.

When the AC voltage Ea is input to the power input terminals T1 and T2, the main switch 132 ′ that is a triac is a normally OFF switch, so the AC voltage Ea is the inductor 12-1, the capacitor 131, and the voltage doubler. It is applied to the series circuit of the rectifier circuit unit 11 (between the connection unit M1 and the connection unit M4). At this time, since the capacitor 131 is inserted in series with respect to the voltage doubler rectifier circuit unit 11 (between the connection unit M1 and the connection unit M4), the voltage applied to the voltage doubler rectifier circuit unit 11 is a normal operation. Lower than time. That is, the voltage applied to the voltage doubler rectifier circuit unit 11 is divided by the capacitance of the capacitor 131 and the impedance of the capacitor of the voltage doubler rectifier circuit unit 11 (a parallel circuit of the first capacitor 111 and the second capacitor 112). It becomes a pressed voltage. Since this voltage is lower than that during normal operation (when the capacitor 131 is not inserted), the current Ic supplied to the light emitting element portion 141 decreases, and the LED groups 142 ₁ and 142 ₂ emit light with low luminance. (Dima lighting). At this time, the current flowing through the LED groups 142 ₁ and 142 ₂ is sufficiently lower than the current during normal operation, and this current value is set by selecting the capacitance of the capacitor 131. The current required for the operation of the protection circuit 17, since it is supplied from the voltage applied to the LED group 142 ₁ and 142 ₂ are adapted to operate at very low currents.

Immediately after on of the AC voltage Ea, it becomes the dimmer illumination as described above, between the connection portion M2 and the input terminal M3 of the light emitting element section 141, of the LED groups 142 ₁ LED411~41n (or LED group 142 ₂ A voltage determined by the number n of LEDs 421 to 42n) connected in series and the forward voltage Vd of the LED is applied. The constant voltage generation unit 171 connected between the input terminal M3 of the light emitting element unit 141 and the connection unit M2 generates a constant voltage Ec divided by the resistor R11 and the Zener diode Z11 at the connection unit M6, and protects it. The circuit 17 is in an operating state. The potential of the OR circuit connection unit (negative logic) M10 that is an input terminal of the latch circuit unit 175 becomes a high level when neither an overcurrent detection unit 173 nor an overheat detection unit 174 detects an abnormality, and the latch circuit unit 175 The driver terminal 176 oscillates and generates a high-level pulse train trigger signal, and the current set by the resistor 136 passes through the x contact from the common terminal of the dimmer switch 134 to transmit light. The light-emitting unit 133 ₁ of the element 133 is driven to turn on the light-receiving unit 133 ₂ , the gate of the main switch 132 ′ serving as a triac and the T 2 terminal are turned on, the main switch 132 ′ is turned on, and normal operation starts. . At this time, the current Ia during normal operation starts to flow from the AC voltage Ea.

Thus, when the main switch 132 ′ is turned on, both ends of the capacitor 131 are short-circuited, and the current Ia flows through the shorted main switch 132 ′. At this time, the inductor 12-1 and the voltage doubler rectifier circuit unit 11 (between the connection part M1 and the connection part M4) are connected in series between the first power supply input terminal T1 and the second power supply input terminal T2. Therefore, the current Ic supplied to the light emitting element unit 141 is the current set by the first capacitor 111 and the second capacitor 112 of the voltage doubler rectifier circuit unit 11. Then, by this current Ic flows, LED group ₁₄₂ 1 of the light emitting element 141, 142 ₂ emits light at normal intensity.

So far, the operation in the case where the dimmer switch 134 is connected to the x contact has been described. However, as described above, neither the overcurrent detection unit 173 nor the overheat detection unit 174 detects an abnormality. When is the operation. The operation when either the overcurrent detection unit 173 or the overheat detection unit 174 detects an abnormality is as described in “(2-1) Function and operation of each component of the protection circuit 17”.
A circuit in which both ends of the capacitor 131 are short-circuited and a current flows through the shorted main switch 132 ′ is referred to as a short circuit.
The amplifier AMP61 of the driver unit 176 corresponds to a component or circuit that outputs a pulse train, and the driver unit 176 corresponds to a circuit that drives and controls the amplifier AMP61.

(2-4) When the dimmer switch 134 is connected to the y contact Here, the dimmer switch 134 is connected to the y contact, and both the overcurrent detection unit 173 and the overheat detection unit 174 are abnormal. The operation of the LED lighting circuit 10-2 when no signal is detected will be described.

When the dimmer switch 134 is connected to the y contact, the operation of the LED lighting circuit 10-2 immediately after the AC voltage Ea is turned on is the AC voltage Ea applied when the dimmer switch 134 is connected to the x contact. The operation is the same as that of the LED illumination circuit 10-2 immediately after the operation, and dimmer illumination is performed. Further, the operation of the protection circuit 17 immediately after the AC voltage Ea is turned on, that is, the constant voltage Ec is generated by the constant voltage generation unit 171, and the protection circuit 17 enters the operating state, and the overcurrent detection unit 173 and the overheat detection unit If none of 174 detects an abnormality, the OR circuit connection unit (negative logic) M10 becomes high level, the output terminal of the amplifier AMP51 also becomes high level, and the driver unit 176 oscillates to trigger a high-level pulse train. The operation of generating a signal is the same. However, when the dimmer switch 134 is connected to the y contact, the current set by the resistor 136 of the switching circuit unit 13-2 passes through the y contact from the common terminal of the dimmer switch 134 and further passes through the dimmer display LED 135. . Thereby, the dimmer display LED 135 emits light. At this time, no current flows through the light emitting portion 133 ₁ of the optical transmission element 133, light receiving unit 133 ₂ will remain off, the main switch 132 'is also in a state of off, dimmer illumination continues.

In this way, the dimmer illumination can be always made by manually performing the switching operation so that the dimmer switch 134 is connected to the y contact. Further, by visually confirming the lighting of the dimmer display LED 135, it can be confirmed that the dimmer illumination is selected by the dimmer switch 134.
In this dimmer illumination state, since the current Ic flowing through the light emitting element portion 141 is reduced and the power consumption is also reduced, overcurrent and overheat detection are eliminated, so that the protection circuit 17 outputs from the driver portion 176 with no abnormality. A current is output, and the dimmer display LED 135 is lit by the current. This lit state indicates the dimmer illumination state and at the same time the normal illumination standby state.
In addition, the dimmer display LED 135 has a function as a “low luminance state display unit” because it displays that the LED group 142 is in a state of emitting light with low luminance by light emission.

So far, have been described in detail the operation of the LED lighting circuit 10-2, the circuit 10-2, not only reduce the current Ic when detecting an overcurrent and overheating in the LED group 142 ₁ and 142 _2, It can also deal with the following abnormalities.
For example, when the AC voltage Ea having an abnormally high voltage is supplied, the current Ic increases as shown in the above equation (4), so that the overcurrent detection unit 173 detects the overcurrent, and the LED Breakage of the groups 142 ₁ and 142 ₂ can be prevented.
In addition, when either of the LED groups 142 ₁ or 142 ₂ connected in parallel is disconnected, the current distributed to the other LED groups 142 ₂ or 142 ₁ increases. 173 by detecting the overcurrent can be prevented from being damaged LED group 142 ₂ or 142 _1.

Further, when one of the LED groups 142 ₁ or 142 ₂ is short-circuited, current concentrates on the LED group 142 ₁ or 142 ₂ in the shorted column, and when the upper limit current value is exceeded, current Ic is detected by overcurrent detection. Is reduced, it is possible to prevent the LEDs 411 to 41n and 421 to 42n from being damaged.
Moreover, when the LED group 142 ₁ and the LED group 142 ₂ constituting the light emitting element section 141 is disconnected either the current Ic flowing in the light emitting element 141 flows through the varistor 16, high leveling capacitor 15 A voltage can be prevented from being applied. Further, when the current Ic flows and the varistor 16 is overheated in this way, the overheat detection unit 174 detects this overheating, thereby reducing the current Ic and preventing the varistor 16 from being overheated. 15 breakage and deterioration can be prevented.

As described above, the LED illumination circuit according to the present embodiment can obtain a high power factor because the inductor is provided between the power input terminal and the voltage doubler rectifier circuit unit.
Further, the LED lighting circuit can determine that the LED lighting circuit is abnormal when the temperature rises excessively or an excessive current flows, and can switch to the dimmer lighting in which the current flowing through the LED group is reduced. As a result, the LED can be prevented from being damaged by overheating or overcurrent, and the occurrence of a failure such as the inability to turn on the LED due to the damage of the LED can be avoided, and the electronic component is melted or burned out due to overheating. The occurrence of disasters such as can be suppressed.

Furthermore, since a dimmer switch for manually switching between normal illumination and dimmer illumination is provided, for example, an LED illumination device that does not require normal illumination (illumination device equipped with an LED illumination circuit) can be switched to dimmer illumination without being turned off. By doing so, power consumption can be suppressed. Moreover, since the normal lighting and the dimmer lighting can be switched at an arbitrary timing, for example, TPO (Time
Depending on the Place Occasion, the brightness of the LED can be used properly. In addition, a dimmer illumination can be used to suspend the LED when it is unnecessary, and a normal illumination can be restored when it is necessary, thereby realizing an LED illumination device having a power saving effect.

Incidentally, the overcurrent detection unit 173 and the overheat detecting section 174 are both LED group ₁₄₂ 1, 142 ₂ on Abnormal (LED group ₁₄₂ 1, 142 ₂ in flowing excessive current, or, LED group ₁₄₂ 1, 142 ₂ of overheating) Therefore, it has a function as an “abnormality detection unit”.
Further, the light transmission element 133, the dimmer switch 134, the dimmer display LED 135, and the resistor 136 of the switching circuit unit 13-2 are switched when an abnormality is detected by the abnormality detection unit (overcurrent detection unit 173 or overheat detection unit 174). Since the main switch 132 ′) is switched to pass a current through the capacitor 131, it has a function as a “switching control means”.

[Third Embodiment of LED Lighting Circuit (First Embodiment of LED Lighting Device)]
Next, a third embodiment of the LED lighting circuit of the present invention (first embodiment of the LED lighting device) will be described with reference to FIGS. FIG. 4 is an external perspective view showing the configuration of the fluorescent lamp lighting fixture and the LED lighting tube, and FIG. 5 is a circuit showing the configuration of the existing glow starter type fluorescent lighting fixture and the LED lighting circuit disposed in the LED lighting tube. FIG.
The present embodiment is different from the first embodiment of the LED lighting circuit in that the LED lighting circuit has a circuit configuration for applying to an existing fluorescent lamp lighting fixture. That is, in the first embodiment, the lighting fixture to which the LED lighting circuit is applied is not specified, whereas in this embodiment, the fixture to which the LED lighting circuit is applied is a fluorescent lighting fixture, and the fluorescent lighting fixture is It differs in the point which showed the structure of the LED illumination circuit for applying. Other components are the same as those in the first embodiment.
Therefore, in FIGS. 4 and 5, the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

Here, the following items will be described.
(1) Fluorescent lamp lighting equipment and LED lighting tube (2) LED lighting circuit Among these, in (1), the LED lighting circuit 10-1 of the first embodiment or the LED lighting circuit 10-2 of the second embodiment is used. The structure of the fluorescent lamp lighting fixture 20 and the LED lighting tube 30 which can be arrange | positioned is demonstrated. Moreover, (2) demonstrates the structure of the LED lighting circuit arrange | positioned at the fluorescent lamp lighting fixture 20 and the LED lighting tube 30. FIG.

(1) Fluorescent lamp illuminator and LED illuminator tube As shown in FIG. 4, the fluorescent lamp illuminator 20 includes a plate-like base 21 attached to a ceiling of a building and a plurality of ( In the figure, two lighting fixture sockets 22 (22a, 22b) are provided.
The lighting fixture socket 22 is a member projecting vertically downward from the lower surface 23 of the base portion 21, and the distance between the lighting fixture socket 22 a and the lighting fixture socket 22 b is substantially the same as the axial length of the LED lighting tube 30. It has become.

In addition, the lighting fixture socket 22a and the lighting fixture socket 22b are provided with insertion holes 24 on the faces thereof. By inserting the light tube socket terminals 33 (described later) of the light tube sockets 32a and 32b of the LED light tube 30 into the insertion hole 24, the light tube socket 32a and the light fixture socket 22a, and the light tube socket 32b and the light fixture socket 22b. Are respectively engaged, and the lighting fixture sockets 22a and 22b support both ends of the LED lighting tube 30.
In addition, in FIG. 4, although the fluorescent lamp lighting fixture 20 for 1 lamp | ramp which can attach one LED lighting tube 30 is shown, the fluorescent lamp lighting fixture 20 is not restricted to one lamp, For example, Further, it may be a fluorescent lamp lighting fixture for two lamps (see FIG. 7) to which two LED lighting tubes 30 can be attached.

  The fluorescent lamp luminaire 20 is a luminaire for emitting a fluorescent lamp (one that emits visible light by irradiating a fluorescent substance with ultraviolet rays in accordance with discharge between internal electrodes), such as a ceiling of a building. The existing fluorescent lamp luminaire can be used as the fluorescent lamp luminaire 20 of the present embodiment. However, the fluorescent lamp luminaire 20 is not limited to the existing fluorescent lamp luminaire, and may be a newly arranged fluorescent lamp luminaire.

The LED illumination tube 30 includes a cylindrical hollow tube portion 31 and illumination tube sockets 32 (32 a and 32 b) fitted to both ends of the tube portion 31.
The tube portion 31 is a transparent or translucent tubular member, and a substrate (not shown) is inserted therein. The LED group 142 which comprises the light emitting element part 141 is arrange | positioned at this board | substrate. And the light radiated | emitted from LED group 142 permeate | transmits the tube part 31, and is discharge | released outside. Thereby, the LED illumination tube 30 functions as an LED illumination tube that irradiates the object with the light of the LED group 142.

The illumination tube socket 32 is a lid member that closes the opening at the end of the tube portion 31. On the outer circular surface of the illumination tube socket 32, illumination tube socket terminals 33 (33a1, 33a2, 33b1, and 33b2) projecting outward are formed. By inserting the lighting tube socket terminal 33 into the insertion hole 24 of the lighting device socket 22 in the fluorescent lighting device 20 described above, the LED lighting tube 30 can be attached to the fluorescent lighting device 20.
In addition, a dimmer switch 134 (or main switch 132) and a selection switch 182 (described later) are provided on the side surface of the lighting tube socket 32. These dimmer switches 134 and the like are provided such that a knob portion that is manually reciprocated and a support frame that supports the knob portion are exposed from the side surface of the lighting tube socket 32.
In the present embodiment, the dimmer switch 134 and the like are provided on the side surface of the lighting tube socket 32, but are not limited to the side surface of the lighting tube socket 32. You can also.

Thus, the LED illumination tube 30 can have an external shape similar to that of a conventionally known fluorescent lamp. However, the LED illumination tube 30 is not limited to an external shape similar to a fluorescent lamp, and may be an external shape similar to a conventionally known incandescent lamp, for example. In this case, an incandescent lamp illuminator to which the incandescent lamp type LED lighting tube can be attached can be used as the luminaire.
Moreover, in this embodiment, these fluorescent lamp lighting fixtures 20 and the LED lighting tube 30 are collectively referred to as “LED lighting device B”.

(2) LED illumination circuit (2-1) Configuration of LED illumination circuit In the fluorescent lamp illumination fixture 20 and the LED illumination tube 30 described in "(1) Fluorescent lamp illumination fixture and LED illumination tube", the first embodiment is used. The LED illumination circuit 10-1 or the LED illumination circuit 10-2 in the second embodiment can be disposed. For example, when the LED illumination circuit 10-1 in the first embodiment is disposed in the glow starter type fluorescent lamp illumination fixture 20 and the LED illumination tube 30, the LED illumination circuit 10-1 is illustrated in FIG. The circuit configuration as shown in FIG. Here, the LED illumination circuit shown in FIG. 5 will be described as “LED illumination circuit 10-3”.

  As shown in the figure, the LED lighting circuit 10-3 includes power input terminals T1, T2, an inductor (ballast) 12-3, a lighting fixture socket terminal 25 (25a1, 25a2, 25b1, 25b2), and an illumination. Tube socket terminal 33 (33a1, 33a2, 33b1, 33b2), capacitor 181, selection switch 182, switching circuit unit 13-1, first voltage doubler rectifier circuit unit 11, and second voltage doubler rectifier circuit Part 11 'and light emitting circuit part 14-1.

Here, the inductor 12-3 is a ballast provided in the existing fluorescent lamp lighting apparatus 20. This ballast is usually installed on the inside or the back surface of the base 21 of the fluorescent lamp lighting device 20.
One end of the primary side of the inductor 12-3 is connected to the first power input terminal T1, and the other end is connected to the second power input terminal T2. Moreover, the secondary side of the inductor 12-3 has one end connected to the lighting fixture socket terminal 25a2 and the other end connected to the lighting fixture socket terminal 25b2.
The inductor 12-3 corresponds to the inductor 12-1 of the LED lighting circuit 10-1 in the first embodiment.

The lighting fixture socket terminal 25 is a terminal disposed inside the lighting fixture socket 22. The lighting fixture socket terminal 25 is connected to the lighting tube socket terminal 33 when the lighting tube socket terminal 33 of the LED lighting tube 30 is inserted into the insertion hole 24 of the lighting fixture socket 22. Thereby, the circuit (lighting fixture side circuit SK1 (described later)) provided in the lighting fixture 20 and the circuit (LED lighting tube side circuit SC (described later)) provided in the lighting tube 30 are electrically connected. It is designed to conduct.
Two of the lighting fixture socket terminals 25 are arranged inside one lighting fixture socket 22. Specifically, lighting fixture socket terminals 25a1 and 25a2 are arranged inside the lighting fixture socket 22a, and lighting fixture socket terminals 25b1 and 25b2 are arranged inside the lighting fixture socket 22b.

  The fluorescent lamp luminaire 20 is provided with a socket 26 for attaching a glow lamp for starting lighting. A lighting fixture socket terminal 25 a 1 is connected to the first terminal 26 a of the socket 26, and a lighting fixture socket terminal 25 b 1 is connected to the second terminal 26 b of the socket 26. Since no voltage is applied to the first terminal 26a and the second terminal 26b of the socket 26, there is no problem even if a glow lamp is connected (for example, when the connection portion M4 ′ is at a high level, the connection portion M4). However, for the sake of explanation, the glow lamp will be explained in a state where it is not connected.

  As described above, the lighting tube socket terminal 33 is a terminal formed to project from the circular surface outside the lighting tube socket 32. Two lighting tube socket terminals 33 are formed in one lighting tube socket 32. Specifically, lighting tube socket terminals 33a1 and 33a2 are formed in the lighting tube socket 32a, and lighting tube socket terminals 33b1 and 33b2 are formed in the lighting tube socket 32b.

One end of the capacitor 181 is connected to the light tube socket terminal 33a1, and the other end is connected to the light tube socket terminal 33a2.
The selection switch 182 is a manual changeover switch, the common terminal is connected to one end of the switching circuit unit 13-1 via the connection unit M0, the y contact is connected to the lighting tube socket terminal 33a1, and the x contact is illuminated. It is connected to the tube socket terminal 33a2.

  The first voltage doubler rectifier circuit unit 11 has the same configuration as the voltage doubler rectifier circuit unit 11 in the first embodiment. In the first voltage doubler rectifier circuit section 11, the connection section M1 is connected to the other end of the switching circuit section 13-1, the connection section M2 is connected to the output terminal of the light emitting circuit section 14-1, and the connection section M3 is connected. It is connected to the input terminal of the light emitting circuit section 14-1, and the connection section M4 is connected to the lighting tube socket terminal 33b2.

The second voltage doubler rectifier circuit unit 11 ′ has a configuration in which a first capacitor 111, a second capacitor 112, a third diode 113 ′, and a fourth diode 114 ′ are connected in a bridge shape. Here, the first capacitor 111 and the second capacitor 112 are the same as the first capacitor 111 and the second capacitor 112 in the first voltage doubler rectifier circuit unit 11. That is, the first voltage doubler rectifier circuit unit 11 and the second voltage doubler rectifier circuit unit 11 ′ share the first capacitor 111 and the second capacitor 112. In addition, a connection portion M1 between one end of the first capacitor 111 and one end of the second capacitor 112 is also a common connection portion M1 between the first voltage doubler rectifier circuit portion 11 and the second voltage doubler rectifier circuit portion 11 ′. It has become.
A connection part M2 between the other end of the first capacitor 111 and the anode of the third diode 113 ′ is connected to the output terminal of the light emitting circuit part 14-1. A connection part M3 between the other end of the second capacitor 112 and the cathode of the fourth diode 114 ′ is connected to an input terminal of the light emitting circuit part 14-1. A connection portion M4 ′ between the cathode of the third diode 113 ′ and the anode of the fourth diode 114 ′ is connected to the illumination tube socket terminal 33b1.

In the LED lighting circuit 10-3 having such a configuration, the power input terminals T1, T2, the inductor 12-3, and the lighting fixture socket terminal 25 are provided in the fluorescent lamp lighting fixture 20, and the lighting tube socket terminal 33 is provided. A capacitor 181, a selection switch 182, a switching circuit unit 13-1, a first voltage doubler rectifier circuit unit 11, a second voltage doubler rectifier circuit unit 11 ′, and a light emitting circuit unit 14-1. The LED lighting tube 30 is provided.
Here, a circuit configured by the power input terminals T1 and T2, the inductor 12-3, and the lighting fixture socket terminal 25 provided in the fluorescent lamp lighting fixture 20 is referred to as a lighting fixture side circuit SK1. Further, the capacitor 181, the selection switch 182, the switching circuit unit 13-1, the first voltage doubler rectifier circuit unit 11, the second voltage doubler rectifier circuit unit 11 ′, and the light emitting circuit unit 14-provided in the LED lighting tube 30. A circuit constituted by 1 and the lighting tube socket terminal 33 is referred to as an LED lighting tube side circuit SC.
Thus, the lighting fixture side circuit SK1 is a circuit disposed between the power input terminals T1 and T2 and the lighting fixture sockets 22a and 22b, and the configuration of the LED lighting circuit 10-1 in the first embodiment. (Power input terminals T1, T2, inductor 12, etc.). Further, the LED lighting tube side circuit SC is a circuit disposed between the lighting tube sockets 32a and 32b and the plurality of LEDs 411 to 41n, and is other than the configuration of the LED lighting circuit 10-1 in the first embodiment. (A voltage doubler rectifier circuit unit 11, a switching circuit unit 13-1, a light emitting circuit unit 14-1, etc.).

The LED illumination circuit 10-3 is a circuit configuration in the case where the LED illumination circuit 10-1 of the first embodiment is disposed in a glow starter type fluorescent lamp luminaire and an LED illumination tube. Instead of the LED illumination circuit 10-1, the LED illumination circuit 10-2 of the second embodiment can be arranged. Specifically, the circuit configuration in this case includes a light emitting circuit unit 14-2 of the LED lighting circuit 10-2 instead of the light emitting circuit unit 14-1 in the LED lighting circuit 10-3 illustrated in FIG. Instead of the switching circuit unit 13-1, the switching circuit unit 13-2 of the LED illumination circuit 10-2 is provided. The LED lighting circuit 10-3 includes a lighting fixture side circuit SK1, a capacitor 181, a selection switch 182, a first voltage doubler rectifier circuit unit 11, a second voltage doubler rectifier circuit unit 11 ′, and the like. Even when 2 is provided, the circuit configuration is the same.
In this case, the lighting fixture side circuit SK1 includes a part of the configuration of the LED lighting circuit 10-2 in the second embodiment (power input terminals T1, T2, inductor 12, etc.). Further, the LED lighting tube side circuit SC is another part of the configuration of the LED lighting circuit 10-2 in the second embodiment (double voltage rectifier circuit unit 11, switching circuit unit 13-2, light emitting circuit unit 14-2, etc. ) Is included.

(2-2) Operation of LED Illumination Circuit The LED illumination circuit 10-3 shown in FIG. 5 operates as follows.
It is assumed that the main switch 132 of the switching circuit unit 13-1 is in an on state.
The AC voltage Ea of the commercial AC power supply ACS is applied between the lighting fixture socket terminal 25a2 and the lighting fixture socket terminal 25b2 via (through) the inductor 12-3.

When this LED lighting tube 30 is attached to the fluorescent lamp lighting fixture 20 by inserting the lighting tube socket terminal 33 of the LED lighting tube 30 into the insertion hole 24 of the lighting fixture socket 22 of the fluorescent lamp lighting fixture 20, the selection switch 182 Depending on the selection, the following two illumination states (Go) and (No) occur.
For example, when the selection switch 182 is connected to the x contact, the light tube socket terminals 33a2 and 33b2 are connected to the light fixture socket terminals 25a2 and 25b2, respectively, and the light tube socket terminals 33a1 and 33b1 are respectively the light fixture socket terminals 25a1. And 25b1, the AC voltage Ea of the commercial AC power supply ACS is applied to the lighting tube socket terminal 33a2 and the lighting tube socket terminal 33b2 via the inductor 12-3. Thereby, the applied voltage passes through the selection switch 182, passes through the switching circuit unit 13-1, is applied to the first voltage doubler rectifier circuit unit 11, and the current Ib is supplied to the light emitting circuit unit 14-1. Thus, the LED group 142 is in a normal illumination state (Go) in which light is emitted with normal luminance.

  On the other hand, by changing the connection of the light tube socket, the light tube socket terminals 33a2 and 33b2 are connected to the light fixture socket terminals 25a1 and 25b1, respectively, and the light tube socket terminals 33a1 and 33b1 are connected to the light fixture socket terminals 25a2 and 25b2, respectively. When connected, the AC voltage Ea of the commercial AC power supply ACS is applied to the lighting tube socket terminal 33a1 and the lighting fixture socket terminal 33b1. Here, since the selection switch 182 is connected to the x contact (the y contact is open), the lighting tube socket terminal 33a1 and the connection portion M0 are not connected, so that the applied The voltage is applied from the lighting tube socket terminal 33a1 through the capacitor 181, through the switching circuit unit 13-1, and to the second voltage doubler rectifier circuit unit 11 '. And the reduced electric current Ib is supplied to the light emission circuit part 14-1, and it will be in the dimmer illumination state (No) in which the LED group 142 light-emits with a brightness | luminance lower than usual. In this case, since the switching circuit unit 13-1 is in the ON state and the dimmer illumination is performed, even if the user of the LED illumination tube 30 performs the switching operation of the main switch 132, it cannot be switched to the normal illumination. Thereby, the user can know that the connection state of the LED illumination tube 30 is (No) connection. Further, in this state, when the user switches the selection switch 182 to the y contact side, the AC voltage Ea of the commercial AC power supply ACS is applied to the second voltage rectifying circuit unit 11 ′, and the light emitting circuit unit 14-1 Since the current Ib is supplied, the normal illumination state (Go) is entered.

Thus, the LED lighting circuit 10-3 has the first voltage doubler rectifier circuit 11 or the second voltage doubler rectifier circuit when an AC voltage is applied to either one of the light tube socket terminals 33b1 or 33b2. One of the sections 11 ′ is selected, but when either the light tube socket terminal 33 a 1 or 33 a 2 is selected, the selection is made by switching the selection switch 182. Here, it is possible to omit the selection switch 182 by short-circuiting the lighting tube socket terminal 33a1 and the connection portion M0, and the lighting tube socket terminal 33a2 and the connection portion M0, respectively. , The heater voltage is applied between the lighting tube socket terminals 33a1 and 33a2, and there is a risk of damaging the rapid starter type fluorescent lamp lighting fixture. Conventionally, since the LED lighting tube 30 of the glow starter type and the rapid starter type fluorescent lamp fixture has the same shape, the alternative LED lighting lamp has the same shape. Become.
In addition, since the current (current Ia, discharge current Ib, charging current) that flows through the LED lighting circuit 10-3 is the same as the current that flows through the LED lighting circuit 10-1 of the first embodiment in principle, The description in is omitted.

(2-3) Other configurations of the LED lighting circuit (2-31) In the case of a rapid starter type fluorescent lamp lighting fixture for one lamp Next, the fluorescent lamp lighting fixture is a rapid starter type fluorescent lamp lighting fixture for one lamp. The configuration of the LED illumination circuit in this case will be described with reference to FIG.
This figure is a circuit diagram showing a configuration of a lighting fixture side circuit SK2 provided in a rapid starter type fluorescent lamp lighting fixture for one lamp.

As shown in the figure, the AC voltage Ea of the commercial AC power supply ACS is supplied to the lighting fixture socket terminals in the first lighting fixture socket 22a and the second lighting fixture socket 22b via the inductor (stabilizer) 12-3 ′. Applied between 25a (25a1 and 25a2) and the luminaire socket terminal 25b (25b1 and 25b2).
The lighting fixture socket terminals 25a1, 25a2, 25b1, 25b2 of the lighting fixture side circuit SK2 are heater power terminals provided to heat the heaters of the connected fluorescent tubes. A voltage of about 3 Vrms is applied.

  When the LED lighting tube 30 having the LED lighting tube side circuit SC shown in FIG. 5 is attached to the lighting fixture 20 ′ (not shown) having the lighting device side circuit SK2 shown in FIG. 6, the commercial AC power supply ACS is used. The AC voltage Ea is applied to both the lighting fixture socket terminals 25a1 and 25a2 and the lighting fixture socket terminals 25b1 and 25b2 via the inductor 12-3 ′. As a result, since one of the AC voltages is supplied to both the lighting tube socket terminals 33a1 and 33a2 and the lighting tube socket terminals 33b1 and 33b2, the selection switch 182 selects either the x contact or the y contact. You may choose. The lighting tube socket terminal 33b2 of the lighting tube socket 32b is connected to the connection part M4 of the first voltage doubler rectification circuit unit 11, and the lighting tube socket terminal 33b1 is connected to the connection part M4 ′ of the second voltage doubler rectification circuit unit 11 ′. Since the heater voltage is superimposed between both terminals, the current is supplied from the higher voltage. Since the same operation is performed when the combination of the light tube sockets is changed, it is not necessary to switch the selection switch 182 in this case. Therefore, in this case, the capacitor 181 and the selection switch 182 can be omitted.

  Here, the capacity of the first capacitor 111 and the second capacitor 112 of the voltage doubler rectifier circuit section 11 or 11 ′ of the LED lighting tube side circuit SC connected to the lighting fixture side circuit SK2 shown in FIG. Is connected in series with the phase advance capacitor 12c included in the voltage of the second voltage doubler rectifier circuit unit 11 'and the voltage between the input terminal M1 of the first voltage doubler rectifier circuit unit 11 and the connection unit M4. The voltage between the input terminal M1 and the connection portion M4 ′ (that is, the voltage Eb shown in FIG. 2) is approximately halved. Since the term Vk shown in the above equation (4) is about ½, for example, it can be corrected by doubling the term C. Therefore, the discharge current Ib can be set to a predetermined current by increasing the capacity of the first capacitor 111 and the second capacitor 112 of the voltage doubler rectifier circuit section 11 or 11 ′ of the LED lighting tube side circuit SC by about twice. it can. That is, when the LED lighting tube 30 provided with the LED lighting tube side circuit SC shown in FIG. 5 is attached to the glow starter type fluorescent lamp lighting device provided with the lighting device side circuit SK1 shown in FIG. When attached to a rapid starter type fluorescent lamp luminaire, the capacity of the first capacitor 111 and the second capacitor 112 of the latter voltage doubler rectifier circuit unit 11 is approximately doubled, which is equivalent to the case of attaching to the former. The discharge current Ib can flow.

  The configuration of the LED lighting tube side circuit SC connected to the lighting fixture side circuit SK2 shown in FIG. 6 is the circuit corresponding to the LED lighting tube side circuit SC in the LED lighting circuit 10-1 shown in FIG. The structure may be sufficient, and the structure of the circuit of the part corresponded to the LED illumination tube side circuit SC among the LED illumination circuits 10-2 shown in FIG. 3 may be sufficient. In the latter case, when the main switch 132 ′ of the switching circuit unit 13-2 is turned off, the capacitor 131 is inserted between the connection unit M 0 that is an input terminal for AC voltage and the connection unit M 1 of the voltage doubler rectification circuit unit 11. As a result, the current Ib flowing through the light emitting circuit unit 14-2 decreases and the dimmer illumination state is set. At this time, the condition for turning off the main switch 132 ′ to enter the dimmer illumination state may be due to detection of an overcurrent or overheat of the light emitting element portion 141 and switching of the dimmer switch 134.

(2-32) In the case of a rapid starter type fluorescent lamp lighting fixture for two lamps Next, with respect to the configuration of the LED lighting circuit when the fluorescent lamp lighting fixture is a rapid starter type fluorescent lamp lighting fixture for two lamps, FIG. This will be described with reference to FIG.
FIG. 7 is an external perspective view showing the configuration of the fluorescent lamp illuminator for two lamps and the LED lighting tube, and FIG. 8 is the configuration of the luminaire side circuit SK3 provided in the rapid starter type fluorescent lamp illuminator for two lamps. FIG.

As shown in FIG. 7, the rapid starter type fluorescent lamp lighting equipment 20 ″ for two lamps can be attached with two LED lighting tubes 30 and corresponds to each of the two LED lighting tubes 30. And the lighting fixture socket 22 (22a, 22b, 22c, 22d) is arrange | positioned. Specifically, lighting fixture sockets 22a and 22c are arranged corresponding to one LED lighting tube 30, and lighting fixture sockets 22b and 22d are arranged corresponding to the other LED lighting tubes 30. ing.
In addition, the rapid starter type fluorescent lamp lighting fixture 20 ″ for two lamps and the LED lighting tube 30 shown in the figure are collectively referred to as “LED lighting device B ′”.

As shown in FIG. 8, the luminaire side circuit SK3 provided in the rapid starter type fluorescent lamp illuminating device 20 '' for two lights is provided in the rapid starter type fluorescent lamp illuminating device 20 for one lamp shown in FIG. Compared with the luminaire side circuit SK2, the luminaire sockets 22c and 22d are newly provided.
The luminaire socket terminal 25c1 of the luminaire socket 22c and the luminaire socket terminal 25d1 of the luminaire socket 22d, and the luminaire socket terminal 25c2 and the luminaire socket terminal 25d2 are directly connected to each other. The ballasts are connected to each other via a secondary winding 12d provided on 12-3 ″. Other configurations are the same as those of the lighting fixture circuit SK2 shown in FIG.

When the LED lighting tube 30 is attached to the rapid starter type fluorescent lamp lighting fixture 20 ″ for two lamps in which the lighting fixture circuit SK3 shown in FIG. 8 is arranged, the one LED lighting tube 30 includes the lighting fixture socket 22a and the lighting fixture. The other LED lighting tube 30 is mounted between the lighting fixture socket 22c, and the other LED lighting tube 30 is mounted between the lighting fixture socket 22b and the lighting fixture socket 22d. Thereby, those two LED lighting tubes 30 are connected in series between the lighting fixture socket 22a and the lighting fixture socket 22b.
As described above, when the two LED lighting tubes 30 are attached to the fluorescent lamp lighting device 20 '' having the lighting device side circuit SK3 shown in FIG. 8, the LED lighting tube side circuit SC operates equivalently with an alternating current. Since this is a circuit in which the LED group 142, which is a saturated load, is connected in series to a constant current circuit having a capacitive reactance configuration, the circuit is a circuit in which the two constant current circuits and the two loads are connected in series. Since this constant current circuit is a capacitor, it is equivalent to a circuit in which two capacitors are connected in series. Therefore, the voltages applied to the two capacitors are distributed in inverse proportion to the capacitance, and the same current Ib flowing through the two capacitors flows through each light emitting circuit unit 14-1 in series to illuminate. .

When the main switch 132 of the switching circuit section 13-1 of one of the two lamps is turned off, the capacitor 131 is connected between the connection section M0 that is an input terminal for AC voltage and the connection section M1 of the voltage doubler rectification circuit section 11. Becomes a circuit inserted in series with the two capacitors described above, and the current Ib determined by the total capacity flows to both lamps and enters the dimmer illumination state. When both lamps are off, a current Ib (about ½) with a smaller total capacity flows through both lamps, resulting in a dimmer illumination state.
As the LED lighting tube side circuit SC, the switching circuit unit 13-2, the voltage doubler rectification circuit unit 11, and the light emitting circuit unit 14-2 of the LED lighting circuit 10-2 shown in FIG. In this case, the condition for turning off the main switch 132 ′ of the switching circuit unit 13-2 to enter the dimmer illumination state is based on detection of overcurrent or overheating of the light emitting element unit 141 and switching of the dimmer switch 134. is there.

  Note that the lighting tube socket terminals 33a1, 33a2, 33b1, and 33b2 of one LED lighting tube 30 are connected to the lighting fixture socket terminals 25a1, 25a2, 25c1, and 25c2, and other LED lightings. Regardless of how the light tube socket terminals 33a1, 33a2, 33b1, 33b2 of the tube 30 are connected to the light fixture socket terminals 25b1, 25b2, 25d1, 25d2, in both cases both light emitting circuit sections 14 are properly applied. −1 can be supplied with the discharge current Ib.

[Fourth Embodiment of LED Lighting Circuit (Second Embodiment of LED Lighting Device)]
Next, a fourth embodiment of the LED lighting circuit of the present invention (second embodiment of the LED lighting device) will be described with reference to FIG. This figure is a circuit diagram showing the configuration of the LED illumination circuit of the present embodiment.
In this embodiment, when compared with the first embodiment of the LED illumination circuit, instead of the switching circuit unit that can switch between normal illumination and dimmer illumination, power off, power on (normal illumination), dimmer illumination, The difference is that a power supply switching circuit unit that can switch between these three states is provided. Other components are the same as those of the first embodiment of the LED lighting circuit.
Therefore, in FIG. 9, the same components as those in FIG.

Here, the following items will be described in order.
(1) Configuration of LED lighting circuit (2) Operation of LED lighting circuit (3) Configuration when LED lighting circuit is provided in lighting fixture and LED lighting tube

(1) Configuration of LED Lighting Circuit As shown in FIG. 9, the LED lighting circuit 10-4 includes power input terminals T1 and T2, a voltage doubler rectifier circuit unit 11, an inductor 12-1, and a power supply switching circuit unit 13. -4 and a light emitting circuit unit 14-1.
The power supply switching circuit unit 13-4 includes a capacitor 131 and a changeover switch 132-4.
The change-over switch 132-4 is a one-circuit, three-contact manual switch. In the changeover switch 132-4, the common terminal (COM) is connected to the second power input terminal T2, the first contact terminal x is opened, and the second contact terminal y is the voltage doubler rectifier circuit. The third contact terminal z is connected to one end of the capacitor 131. The other end of the capacitor 131 is connected to the connection portion M4 of the voltage doubler rectifier circuit portion 11.

  In FIG. 9, the power supply switching circuit unit 13-4 is connected in series between the second power supply input terminal T <b> 2 and the connection unit M <b> 4 of the voltage doubler rectifier circuit unit 11, but is not limited thereto. Instead, for example, the first power supply input terminal T1 and the inductor 12-1 can be connected in series. In this case, the common terminal (COM) of the changeover switch 132-4 is connected to the first power input terminal T1, the first contact terminal x is opened, and the second contact terminal y is connected to one end of the inductor 12-1. The third contact terminal z is connected to one end of the capacitor 131, and the other end of the capacitor 131 is connected to one end of the inductor 12-1.

Further, as shown in FIG. 10, the power supply switching circuit unit 13-4 has a power switch 19 that switches between power-on (ON) and power-off (OFF), and a switching circuit unit 13- that switches between normal illumination and dimmer illumination. It can be divided into 1. As a circuit configuration in this case, the power switch 19 is connected in series between the second power input terminal T2 and the connection part M4 of the voltage doubler rectifier circuit part 11, and the switching circuit part 13-1 is connected to the inductor 12. -1 and the connection part M1 of the voltage doubler rectifier circuit part 11 can be connected in series.
That is, the inductor 12-1, the switching circuit unit 13-1, the voltage doubler rectifier circuit unit 11, and the power switch 19 can be connected in series in any order between the power input terminals T1 and T2. However, the COM terminal of the power switch 19 is preferably a circuit connected to either the power input terminal T1 or T2.

Moreover, the power supply switching circuit unit 13-4 can be connected to the input circuit unit of the AC power supply ACS of the LED illumination circuit 10-2 shown in FIG.
Furthermore, the power supply switching circuit unit 13-4 can be connected to the lighting fixture side circuits SK1, SK2, and SK3 shown in FIGS. 5, 6, and 8, but these configurations are described later in “(3)”. This will be described in detail in “Configuration when LED lighting circuit is provided in lighting fixture and LED lighting tube”.

(2) Operation of LED Lighting Circuit The LED lighting circuit 10-4 shown in FIG. 9 is powered off, powered on (normal light emission state), dimmer illumination by switching the selector switch 132-4 of the power switching circuit unit 13-4. Three types of states (low luminance emission state) can be selected.
For example, when the switch 132-4 is switched and the common terminal (COM) and the contact terminal x are connected, the path of the current flowing from the AC power supply ACS is cut by the switch 132-4, and the LED group 142 Thus, the LED group 142 is turned off.

  When the change-over switch 132-4 is switched and the common terminal (COM) and the contact terminal y are connected, the power-on (normal light emission state) is selected. In this case, since the second power input terminal T2 and the connection part M4 of the voltage doubler rectifier circuit part 11 are directly connected, the main switch 132 of the switching circuit part 13-1 shown in FIG. It becomes the same state as having entered the state, the current Ic flows through the LED group 142, and the normal light emission state is entered.

Further, when the changeover switch 132-4 is switched and the common terminal (COM) and the contact terminal z are connected, the dimmer illumination (low luminance light emission state) is selected. In this case, since the capacitor 131 is connected in series between the second power supply input terminal T2 and the connection part M4 of the voltage doubler rectifier circuit unit 11, a current flows through the capacitor 131, and the LED The reduced current Ic flows through the group 142, and the light emission state is low.
In this way, by switching the selector switch 132-4 of the power supply switching circuit unit 13-4, any one of power off, power on (normal light emission state), and dimmer illumination (low luminance light emission state) is selected. can do.

Note that the LED lighting circuit 10-4 ′ shown in FIG. 10 can also select three types of states: power-off, power-on, and dimmer lighting, as with the LED lighting circuit 10-4 shown in FIG.
For example, when the power switch 19 is switched and the common terminal (COM) and the contact terminal x are connected, the power off is selected and the LED group 142 is turned off.
Further, when the power switch 19 is switched to connect the common terminal (COM) and the contact terminal y, and when the main switch 132 of the switching circuit unit 13-1 is on, the power on (normal light emission state) is selected. The LED group 142 is in a normal light emission state.
Further, when the power switch 19 is switched to connect the common terminal (COM) and the contact terminal y, and when the main switch 132 of the switching circuit unit 13-1 is OFF, dimmer illumination (low luminance light emission state) is selected. Then, the LED group 142 is in a low-luminance light emission state.

(3) Configuration when LED lighting circuit is provided in lighting fixture and LED lighting tube The LED lighting circuits 10-4 and 10-4 ′ shown in FIGS. 9 and 10 can be arranged in the LED lighting tube. . Among them, when the LED lighting circuit 10-4 shown in FIG. 9 is disposed in the LED lighting tube lighting fixture and the LED lighting tube, the LED lighting circuit 10-4 is, for example, a circuit as shown in FIG. It becomes possible to arrange | position with a structure. Here, the LED illumination circuit shown in FIG. 11 is described as “LED illumination circuit 10-4 ″”.

  As shown in the figure, the LED lighting circuit 10-4 ″ includes power input terminals T1, T2, a power switching circuit unit 13-4, an inductor (ballast) 12-1, and a lighting fixture socket terminal 25 ( 25a1, 25a2, 25b1, 25b2), lighting tube socket terminal 33 (33a1, 33a2, 33b1, 33b2), capacitor 181, selection switch 182, switching circuit unit 13-1, and first voltage doubler rectifier circuit Unit 11, a second voltage doubler rectifier circuit unit 11 ', and a light emitting circuit unit 14-1.

The LED lighting circuit 10-4 ″ having such a configuration includes power input terminals T1, T2, a power switching circuit unit 13-4, an inductor 12-1, and a lighting fixture socket terminal 25. '''(See FIG. 12), the light tube socket terminal 33, the capacitor 181, the selection switch 182, the switching circuit unit 13-1, the first voltage doubler rectifier circuit unit 11, The second voltage doubler rectifier circuit unit 11 ′ and the light emitting circuit unit 14-1 are provided in the LED lighting tube 30.
Here, the circuit constituted by the power input terminals T1, T2, the power switching circuit unit 13-4, the inductor 12-1, and the lighting fixture socket terminal 25 provided in the LED lighting tube lighting fixture 20 ′ ″ is illuminated. Let it be an instrument side circuit SK4.
The lighting fixture side circuit SK4 is a circuit disposed between the power input terminals T1 and T2 and the lighting fixture sockets 22a and 22b, and is a part of the configuration of the LED lighting circuit 10-4 shown in FIG. LED lighting tube lighting fixture side circuit including input terminals T1, T2, power supply switching circuit unit 13-4, inductor 12, and the like.

Further, the LED illumination tube side circuit SC shown in FIG. 11 is the same as the LED illumination tube side circuit SC of the LED illumination circuit 10-3 shown in FIG. That is, the LED illumination circuit 10-4 ″ shown in FIG. 11 includes an LED illumination tube side circuit SC connected to the illumination fixture side circuit SK1 of the glow starter type fluorescent lamp fixture shown in FIG. A lighting fixture side circuit SK4 including a power supply switching circuit unit 13-4 is connected as a side circuit.
The LED lighting tube side circuit SC shown in FIG. 11 includes other parts of the configuration of the LED lighting circuit 10-4 shown in FIG. 9 (such as the voltage doubler rectifier circuit unit 11 and the light emitting circuit unit 14-1). Yes.

  Moreover, the circuit which short-circuited between the lighting fixture socket terminals 25a1 and 25a2 and 25b1 and 25b2 of LED lighting circuit 10-4 '' shown in FIG. 11 can be connected to a glow starter type fluorescent lamp fixture or a rapid starter type fluorescent lamp fixture. The LED lighting tube side circuit SC is a compatible circuit so that it can be connected to the lighting device side circuit SK4 which is the LED lighting tube lighting device side circuit. By short-circuiting both terminals, one of the lighting fixture socket terminals 25a1 and 25a2 is connected to either of the lighting tube socket terminals 33a1 and 33a2, so that the other lighting fixture is connected without operating the selection switch 182. Similarly, the socket terminals 33b1 and 33b2 are connected to both the connection portions M4 and M4 ′ of the first and second voltage doubler rectifier circuit portions 11.

In addition, the power supply switching circuit unit 13-4 can be provided at an arbitrary position on the lower surface 23 of the base 21 of the LED lighting tube lighting fixture 20 ′ ″ as shown in FIG. Specifically, in the power supply switching circuit unit 13-4, a knob portion that is manually slid (sliding) and a support frame that supports the knob portion are provided on the lower surface of the base portion 21 of the LED lighting tube lighting fixture 20 ′ ″. 23 to be exposed.
In the present embodiment, the LED illumination tube luminaire 20 ′ ″ and the LED illumination tube 30 are collectively referred to as “LED illumination device B ″”.

As described above, the LED lighting circuit of the present embodiment is configured to include the power supply switching circuit unit capable of switching between three types of power-off, power-on, and dimmer illumination. It is possible to easily and reliably switch off and dimmer illumination.
Moreover, since the LED illumination circuit of this embodiment can be easily set to dimmer illumination by inserting a capacitor in series with the input circuit of the AC power supply, a power switch for turning on / off the power, normal illumination, and dimmer illumination The LED illumination circuit of this embodiment can be configured by combining a switching circuit unit that switches between the two.

  Furthermore, many of the conventional indoor lightings are configured to turn on / off the power of a plurality of lighting fixtures by a wall switch. By installing a plurality of LED lighting fixtures of the present embodiment on the ceiling of the room and performing individual switching operations (necessity selection), an arbitrary number of LED lighting fixtures can be selected from the plurality of LED lighting fixtures. Energy saving can be achieved by switching the fixture to dimmer lighting and adjusting the brightness.

Moreover, the LED illumination circuit of this embodiment which can implement | achieve dimmer illumination can be used in various places.
For example, it can be used where a small amount of light is required, such as a footlight. Thereby, the LED lighting fixture of this embodiment can satisfy | fill the necessity, without providing the small light bulb (what is called a miniature light bulb) with a low brightness | luminance for obtaining the slight light.
Furthermore, since the LED illumination circuit according to the present embodiment can be easily manually switched between power on / off and dimmer illumination, the LED illumination circuit can be used for a desk lamp or a small lighting fixture, and can easily contribute to energy saving.

The LED illumination circuit 10-4 shown in FIG. 9 includes only one capacitor 131 in the power supply switching circuit unit 13-4, and can select three types of states of power on, power off, and dimmer illumination. However, the present invention is not limited to this configuration. For example, in addition to power-on and power-off, it is possible to select multiple levels of dimmer illumination with different brightness. That is, a plurality of dimmer illuminations with different brightnesses can be selected by connecting a plurality of capacitors having different capacities to the terminals of the changeover switch 132-4 and connecting them to their respective terminals.
In the dimmer illumination state, the capacitor 131 of the power supply switching circuit unit 13-4 is connected in series with the capacitors 111 and 112 of the voltage doubler rectifier circuit unit 11, so that the total capacity of the capacitor is reduced, and therefore the phase of the current Ib is reduced. Progresses and power factor decreases. In order to improve the power factor at this time, it can be adjusted by additionally inserting an inductor in series with the capacitor 131.

[Fifth Embodiment of LED Lighting Circuit (Third Embodiment of LED Lighting Device)]
Next, a fifth embodiment of the LED lighting circuit of the present invention (third embodiment of the LED lighting device) will be described with reference to FIGS. FIG. 13 is a circuit diagram showing a configuration of the LED illumination circuit of the present embodiment. FIG. 14 is a circuit diagram showing a configuration of a power supply switching circuit unit and a remote control transmitter circuit included in the LED illumination circuit shown in FIG.
In the present embodiment, a power supply switching circuit unit that can be added to the LED lighting circuit of the first embodiment and capable of switching between three types of states of power-on, power-off, and dimmer illumination, and this power switching circuit unit are used as a radio signal. It is an LED illumination circuit provided with the remote control transmitter operated by.
In FIG. 13, the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

Here, the following items will be described in order.
(1) Configuration of LED lighting circuit and power supply switching circuit section (2) Operation of LED lighting circuit and power supply switching circuit section

(1) Configuration of LED Lighting Circuit and Power Supply Switching Circuit Unit As shown in FIG. 13, the LED lighting circuit 10-5 of this embodiment includes power input terminals T1 and T2, a power supply switching circuit unit 13-5, and a remote controller. Transmitter circuit 51, inductor (ballast) 12-1, lighting fixture socket terminal 25 (25a1, 25a2, 25b1, 25b2), lighting tube socket terminal 33 (33a1, 33a2, 33b1, 33b2), and capacitor 181, a selection switch 182, a switching circuit unit 13-1, a first voltage doubler rectifier circuit unit 11, a second voltage doubler rectifier circuit unit 11 ′, and a light emitting circuit unit 14-1. Yes.

Here, as illustrated in FIG. 14, the power supply switching circuit unit 13-5 includes a constant voltage generation unit 137, a driver unit 138, and a switch unit 139.
The constant voltage generation unit 137 includes a diode D71, a resistor R71, a Zener diode Z71, and a capacitor C71. The diode D71, the resistor R71, and the Zener diode Z71 are connected in series between the first power input terminal T1 and the second power input terminal T2. Specifically, the cathode of the diode D71 is connected to the first power input terminal T1, and the anode is connected to one end of the resistor R71. The other end of the resistor R71 is connected to the anode of the Zener diode Z71, and the cathode of the Zener diode Z71 is connected to the second power input terminal T2. One end of the capacitor C71 is connected to the connection portion M20 between the resistor R71 and the Zener diode Z71, and the other end is connected to the cathode of the Zener diode Z71.

  The driver unit 138 includes a resistor R81, a resistor R82, a resistor R83, a resistor R84, a capacitor C81, and an amplifier AMP81. Specifically, the resistor R81 has one end connected to the second power input terminal T2 and the other end connected to the positive input terminal of the amplifier AMP81. The resistor R82 has one end connected to the positive input terminal of the amplifier AMP81 and the other end connected to the connection unit M20 of the constant voltage generation unit 137. The resistor R83 has one end connected to the positive input terminal of the amplifier AMP81 and the other end connected to the output terminal of the amplifier AMP81. The resistor R84 has one end connected to the output terminal of the amplifier AMP81 and the other end connected to the negative input terminal of the amplifier AMP81. The capacitor C81 has one end connected to the negative input terminal of the amplifier AMP81 and the other end connected to the connection unit M20 of the constant voltage generation unit 137. The power supply of the amplifier AMP81 is supplied from the constant voltage -Ee of the constant voltage generation unit 137.

The switch unit 139 includes a capacitor C91, a resistor R91, a PIN photodiode PD, a flip-flop FF1, a flip-flop FF2, a NAND circuit (gate) G1, a NAND circuit (gate) G2, a resistor R92, and a resistor R93, triac 132′-1, triac 132′-2, capacitor 131, and remote control light receiving control unit RC.
Here, the capacitor C91 and the resistor R91 are connected in series between the second power input terminal T2 and the connection part M20 of the constant voltage generation part 137. Specifically, one end of the capacitor C91 is connected to the second power input terminal T2, the other end is connected to one end of the resistor R91, and the other end of the resistor R91 is connected to the connection portion M20 of the constant voltage generation unit 137. ing. And the connection part of the capacitor | condenser C91 and resistance R91 is connected to the input terminal S of remote control light reception control part RC.
The PIN photodiode PD has a cathode connected to the input terminal PI of the remote control light reception control unit RC, and an anode connected to the connection unit M20 of the constant voltage generation unit 137.

For example, a D-type flip-flop can be used as the flip-flop FF1 and the flip-flop FF2, and a data input terminal S (S1, S2) for inputting a high level (H) or low level (L) signal and a clock signal are input. An input clock input terminal C (C1, C2), an output terminal Q (Q1, Q2) for outputting a positive output signal, and an output terminal -Q (for outputting a signal inverted from the output signal of the output terminal Q -Q1, -Q2 Originally, as shown in FIG.14, a bar (overbar) should be added above Q1 and Q2, but since this cannot be represented here, "-Q1,- Q2 ”is used instead).
In the flip-flop FF1, the data input terminal S1 is connected to the set output terminal A1 of the remote control light reception control unit RC, the clock input terminal C1 is connected to the output terminal C of the remote control light reception control unit RC, and the output terminal Q1 is a NAND circuit. Connected to one input terminal of G1, the output terminal -Q1 is open. The flip-flop FF2 has a data input terminal S2 connected to the set output terminal A2 of the remote control light reception control unit RC, a clock input terminal C2 connected to the output terminal C of the remote control light reception control unit RC, and an output terminal Q2 of the NAND circuit G2. Connected to one input terminal, the output terminal -Q2 is open.

The other input terminal of the NAND circuit G1 and the other input terminal of the NAND circuit G2 are connected to the output terminal of the amplifier AMP81 of the driver unit 138. The output terminal of the NAND circuit G1 is connected to one end of the resistor R92, and the other end of the resistor R92 is connected to the gate of the triac 132′-1. The output terminal of the NAND circuit G2 is connected to one end of the resistor R93, and the other end of the resistor R93 is connected to the gate of the triac 132′-2.
The triac 132′-1 has a T1 terminal connected to the second power input terminal T2 and a T2 terminal connected to the second power output terminal T2 ′. The triac 132′-2 has a T1 terminal connected to the second power input terminal T2 and a T2 terminal connected to the second power output terminal T2 ′ via the capacitor 131. Note that the second power output terminal T2 ′ is a terminal provided between, for example, the second power input terminal T2 of FIG.

The remote control transmitter circuit 51 is a circuit provided in the remote control transmitter 50.
The remote control transmitter 50 is a so-called remote controller formed independently of the LED lighting tube lighting fixture 20 ′ ″ and the LED lighting tube 30 and is miniaturized for easy carrying and attached to a wall or the like. There is a structure that is fixed to the wall and a structure in which a holder is provided on the wall and can be attached to and detached from the wall.

The remote control transmitter circuit 51 operates a battery BT that supplies power to the remote control transmitter circuit 51, a pulse generator PG that outputs a pulse signal, and an infrared-coded modulated signal based on the pulse signal. It has an infrared light emitting LED (LED2) that emits (wireless transmission) as a signal.
In addition, the remote control transmitter 50 is provided with one or more push buttons (not shown), and the pulse generator PG is selected according to the type of push button pressed or the number of times the push button is pressed. Outputs a predetermined pulse signal, the LED 2 emits light based on this pulse signal, and emits an infrared-coded modulation signal.

(2) Operation of LED Lighting Circuit and Power Supply Switching Circuit Unit The constant voltage generation unit 137 supplies the necessary DC power supply -Ee to the power supply switching circuit unit 13-5 with the second power input terminal T2 as a common (COM). . That is, the AC voltage Ea at the first power input terminal T1 is rectified by the rectifier diode D71 using the second power input terminal T2 as a common terminal (COM), and then divided by the resistor R71 and the Zener diode Z71 to be a DC voltage −Ee. Is output from the connection unit M20.

The driver unit 138 operates in substantially the same manner as the driver unit 176 shown in FIG. 3, and a duty-controlled pulse train necessary for reducing the power for triggering the triacs 132′-1 and 132′-2. Occur.
In the driver unit 138, the resistor R81 is connected to the COM terminal (second power supply input terminal T2) which is at a high level, so that it always oscillates while the AC voltage Ea is supplied. . Since the detailed operation principle has already been described as the operation of the driver unit 176 in the second embodiment, the description thereof is omitted here.

The switch unit 139 receives an infrared coded modulation signal emitted from an external remote control transmitter 50 by a PIN photodiode PD as a sensor, demodulates the electric signal by a remote control light reception control unit RC, and outputs a set output. A set signal is output from the terminals A1 and A2.
The NAND gates G1 and G2 logically select the codes of the flip-flops FF1 and FF2 set by the set signals from the set output terminals A1 and A2, and trigger the gate of the triac 132′-1 or 132′-2 with the pulse train signal. It is supposed to be.

Here, when the NAND circuit G1 is selected, the triac 132'-1 is continuously triggered by the duty-controlled negative pulse train signal through the resistor R92, and the triac 132'-1 is kept in an on state, so that the normal illumination is performed. State.
On the other hand, when the NAND circuit G2 is selected, the triac 132′-2 is continuously triggered through the resistor R93, and the triac 132′-2 is kept in the ON state. Lighting.
If neither of the NAND circuits G1 and G2 is selected, neither gate of the triacs 132′-1 and 132′-2 triggers, and the power is turned off.
The data input terminals S1 and S2 of the flip-flops FF1 and FF2 are also initial setting inputs when the power is turned on, and are set to the normal illumination state when the power is turned on.

  When the operation signal (infrared coded modulation signal) received by the PIN photodiode PD is input at the input terminal PI, the remote control light receiving control unit RC decodes the operation signal and converts it into a command signal. The output signals A1 and A2 are input to the data input terminals S1 and S2 of the flip-flops FF1 and FF2, and set to the flip-flops FF1 and FF2 by the clock signal C. For example, if the set output signal A1 is 1 (H: High) and the set output signal A2 is 0 (L: Low), the output Q of the flip-flop FF1 is 1 (H) and the output Q of the flip-flop FF2 is 0 ( L).

The flip-flops FF1 and FF2 are latch registers, and the set state is held until the next set output signal is input.
The NAND circuits G1 and G2 are two-input NAND gates, and the output becomes L only when both inputs are H. If either or both are L, the output becomes H.
In the triacs 132′-1 and 132′-2, the T1 terminal is connected to the second power input terminal T2, which is a common terminal, and a negative trigger current is passed through the resistor R92 or R93 to the selected gate. To turn on the triac 132′-1 or 132′-2.

  In the initial state in which the AC voltage Ea is supplied, both ends of the capacitor C91 are 0 V. Therefore, when the DC power supply -Ee rises, the input S of the remote control light receiving control unit RC becomes H, the set output A1 becomes 1 (H), The set output A2 becomes 0 (L), and the clock signal C sets the output Q1 of the flip-flop FF1 to H and the output Q2 of the flip-flop FF2 to L. When the input Q1 of the NAND circuit G1 becomes H and the output DR of the driver unit 138 becomes H, the output of the NAND circuit G1 becomes L. That is, in the initial state of power-on, since the flip-flop FF1 is set and the flip-flop FF2 is reset, the output terminal LT of the NAND circuit G2 outputs a negative pulse train, and the triac 132′-1 through the resistor R92. The triac 132'-1 is turned on by triggering the gate, and normal illumination is obtained. At this time, since the output Q2 of the flip-flop FF2 is L, the triac 132'-2 is turned off.

When a command to switch to dimmer illumination is sent from the remote control transmitter 50, the set output A1 of the remote control light receiving control unit RC becomes 0 (L) and the set output A2 becomes 1 (H), and these are set in the flip-flops FF1 and FF2. Since the output Q1 of the flip-flop FF1 is set to L and the output Q2 of the flip-flop FF2 is set to H, a negative pulse train is output from the output DM of the NAND circuit G2, and the triac 132′-2 is turned on and the dimmer illumination is turned on. It becomes. At this time, the triac 132′-1 is turned off.
On the other hand, when a command to turn off the power is sent from the remote control transmitter 50, the set output A1 of the remote control light receiving control unit RC becomes 0 (L) and the set output A2 also becomes 0 (L), and these are set in the flip-flops FF1 and FF2. Then, the output Q1 of the flip-flop FF1 is set to L and the output Q2 of the flip-flop FF2 is also set to L, so that the outputs LT and DM of the NAND circuits G1 and G2 become H, and the triacs 132′-1 and 132 Since '-2 is not triggered, it is turned off and the power is turned off.

  As described above, the LED lighting circuit of the present embodiment operates the remote control transmitter and wirelessly transmits an operation signal to the power switching circuit unit provided in the LED lighting tube lighting fixture, thereby turning off the power. It is possible to easily and surely switch between the three states of power-on and dimmer illumination.

Of the LED illumination circuit 10-5 shown in FIG. 13, the power input terminals T1, T2, the power supply switching circuit unit 13-5, the inductor 12-1, the LED disposed in the LED lighting tube lighting fixture 20 ′ ″ A circuit constituted by the lighting fixture socket terminal 25 is referred to as a lighting fixture side circuit SK5.
14 can be connected to the input terminals of the AC power supplies of the LED lighting circuits 10-1, 10-2, and 10-3 shown in FIGS.
Further, in the present embodiment, the LED lighting tube lighting fixture 20 ′ ″ provided with the lighting fixture side circuit SK5 shown in FIG. 13 and the LED lighting provided with the LED lighting tube side circuit SC shown in FIG. The tube 30 and the “LED lighting device” are collectively referred to.

  In addition, when the LED lighting tube and the LED lighting fixture are separated from each other by a connector, a switching circuit unit controlled by a protection circuit provided in the LED lighting tube and a power source provided on the LED lighting fixture side. The switching circuit unit is connected in series. In the case of a structure in which both are integrated, a signal is sent to the remote control light receiving control unit of the power switching circuit unit on the secondary side of the light transmission element driven by the protection circuit. If sent, the switching circuit portion can be omitted. In other words, when integrated, the two lines on the secondary side of the light transmission element can be connected to the power supply switching circuit, so that the light transmission element can be a photocoupler whose secondary side is a phototransistor. The switching circuit unit can be omitted by inputting a signal to an input terminal (for example, an IO terminal is added) of the remote control light receiving control unit.

  Further, the circuit of the LED lighting tube side circuit SC that can be connected to any of the glow starter type fluorescent lamp fixture, the rapid starter type fluorescent lamp fixture and the LED lighting tube lighting fixture shown in FIG. 5 and FIG. Since the voltages applied to the inductor and the LED lighting tube side circuit SC are different from each other, by setting constant capacitors 111 and 112 suitable for each, and switching according to the lighting fixture to be connected, interchangeability is obtained. be able to.

As mentioned above, although preferred embodiment of the LED lighting circuit and LED lighting device of this invention was described, the LED lighting circuit and LED lighting device which concern on this invention are not limited only to embodiment mentioned above, The present invention is not limited. It goes without saying that various modifications can be made within the range.
For example, in FIG. 1, only one switching circuit unit 13-1 is connected between the inductor 12-1 and the connection part M1 of the voltage doubler rectifier circuit unit 11, but the switching circuit unit 13-1 is However, the number is not limited to one, and a plurality of them can be connected in series between the inductor 12-1 and the connection part M1 of the voltage doubler rectifier circuit part 11. In this case, by switching the main switches 132 of the plurality of switching circuit units 13-1 arbitrarily (or under a predetermined condition), the total capacity of the capacitors 131 connected in series is changed, and the LED group The luminance of 142 can be changed in a plurality of steps according to the change of the total capacity.

The LED lighting circuit of the present invention may be an arbitrary combination of the LED lighting circuits in each of the first to fifth embodiments.
Moreover, the LED lighting device of the present invention may be an arbitrary combination of the LED lighting devices in each of the first to third embodiments.

10 (10-1 to 10-5) LED illumination circuit 11, 11 ′ voltage doubler rectifier circuit unit 111 first capacitor 112 second capacitor 113 first diode 114 second diode 12 (12-1, 12-3, 12− 3 ', 12-3'') Inductors 13-1, 13-2 Switching circuit unit 13-4, 13-5 Power supply switching circuit unit 131 Capacitor 132, 132' Main switch 132-4 Changeover switch 137 Constant voltage generation unit 138 driver unit 139 switch unit 14 (14-1, 14-2) emitting circuit section 141 light-emitting element portion 142,142 _{1, 142} 2 LED group 15 leveling capacitor 16 varistor 17 protection circuit 171 constant-voltage generating unit 172 first reference voltage Generation unit 173 Overcurrent detection unit 174 Overheat detection unit 175 Latch circuit unit 176 Driver unit 20, 20 ′ 20 '' fluorescent lighting fixture 20 '''LED light tube lighting apparatus 30 LED light tube 411 to 41n, 421-42n LED
50 Remote control transmitter 51 Remote control transmitter circuit T1, T2 Power input terminal ACS Commercial AC power supply B, B ′, B ″ LED lighting device SK1, SK2, SK3, SK4, SK5 Lighting fixture side circuit SC LED lighting tube side circuit

Claims (14)

An LED lighting circuit comprising a power input terminal for inputting an AC power source, an inductor, a voltage doubler rectifier circuit unit for rectifying the AC power source, and a light emitting circuit unit including an LED group in which a plurality of LEDs are connected in series. There,
In series with the circuit connected to the inductor and the voltage doubler rectifier circuit unit between the power input terminal and the LED group, a switching circuit unit capable of selecting a capacitor and a short circuit with a switch,
When the switch selects the short circuit, a current flowing through the LED group flows through the short circuit, and the LED group enters a normal light emitting state in which light is emitted at a normal luminance.
When the switch selects the capacitor, the current that flows through the LED group flows through the capacitor and becomes a current that is less than the current that flows through the LED group in the normal light emission state, and the LED group An LED illumination circuit characterized by being in a low-luminance light emission state in which light is emitted at a lower luminance than that in the light emission state. An abnormality detection unit that detects an abnormality related to the LED group,
The switching circuit unit includes a switching control unit that, when an abnormality is detected by the abnormality detection unit, the switch selects the capacitor and causes a current to flow through the LED group to flow through the capacitor;
The LED illumination circuit according to claim 1, wherein when the current flows through the capacitor, the current flowing through the LED group is reduced to cause the LED group to emit light in the low-luminance light emitting state. The capacitor is a current reduction capacitor,
The switching circuit unit is provided between the power input terminal and the voltage doubler rectifier circuit unit, and is provided before or after the inductor,
The voltage doubler rectifier circuit unit includes a first capacitor and a second capacitor connected to one end of each, a first diode having an anode connected to the other end of the first capacitor, and a second capacitor connected to the other end of the second capacitor. A second diode having a cathode connected and an anode connected to the cathode of the first diode;
The switching circuit unit is connected in series to a parallel circuit of the first capacitor and the second capacitor,
When no abnormality is detected by the abnormality detection unit, the switch selects the short circuit, and a current is passed through a parallel circuit of the first capacitor and the second capacitor to cause the LED group to emit the normal light. The light is emitted with the brightness
When an abnormality is detected by the abnormality detection unit, the switch selects the current reduction capacitor, and a current flows through the parallel circuit of the first capacitor and the second capacitor, thereby reducing the current flowing through the LED group. The LED illumination circuit according to claim 2, wherein the LED group emits light at the low luminance. The abnormality detection unit includes an overcurrent detection unit that detects an overcurrent flowing through the LED group,
When the overcurrent is detected by the overcurrent detection unit, the switching control unit of the switching circuit unit selects the current reduction capacitor and causes the current to flow through the current reduction capacitor. The LED illumination circuit according to claim 3, wherein the LED group emits light with the low luminance by reducing a current flowing through the LED group. The abnormality detection unit includes an overheat detection unit that detects overheating in the LED group,
When the overheat is detected by the overheat detection unit, the switching control unit of the switching circuit unit selects the current reduction capacitor, and causes the current to flow through the current reduction capacitor when the overheat is detected. 5. The LED illumination circuit according to claim 3, wherein the LED group emits light with the low luminance by reducing a current flowing through the LED. The switching circuit unit is configured by a circuit in which the switch includes a triac, and the current reducing capacitor is connected between the T1 terminal and the T2 terminal of the triac.
A driver unit that sends a rectangular wave signal that is a pulse train to the switching control means of the switching circuit unit;
The driver part is
When no abnormality is detected by the abnormality detection unit, the drive or control of the component or circuit that outputs the pulse train is performed, the pulse train is sent to the switching circuit unit, and a predetermined current is supplied to the gate of the triac to turn it on. To the normal brightness state by the current flowing through the triac,
When an abnormality is detected by the abnormality detection unit, the rectangular wave signal is not sent to the switching circuit unit, the triac is turned off, a current is supplied to the current reducing capacitor, and a current flowing through the LED group is The LED illumination circuit according to claim 3, wherein the LED group emits light at the low brightness. Comprising a monolithic multivibrator or a bistable multivibrator, comprising a latch circuit part for controlling the driver part,
When an abnormality is detected by the abnormality detection unit, the triac is latched by the latch circuit unit and the output of the driver unit is stopped, thereby keeping the triac off and causing the LED group to emit light at the low luminance. When the abnormality is not detected, when the latch circuit unit is a monostable multivibrator, the latch circuit unit maintains the output stop state of the driver unit until a predetermined time elapses. Maintaining the state where the LED group emits light at the low luminance, and when the predetermined time has elapsed, the output of the driver unit is output to cause the LED group to emit light at the normal luminance,
7. The latch circuit unit according to claim 6, wherein, when the latch circuit unit is a bistable multivibrator, the LED group continues to emit light at the low luminance even when the abnormality is not detected. LED lighting circuit. The switching control means of the switching circuit unit has a light transmission element,
This light transmission element is
A light emitting unit that emits light when receiving the rectangular wave signal from the driver unit;
The LED illumination circuit according to claim 6, further comprising a light receiving unit that switches the switch when receiving light from the light emitting unit. The switching control means of the switching circuit unit is:
A low-luminance state display unit that displays by light emission that the LED group is in a state of emitting light at the low luminance;
The LED illumination circuit according to claim 8, further comprising: a manual changeover switch that sends the rectangular wave signal from the driver unit to either the light transmission element or the low luminance state display unit. A leveling capacitor connected in parallel to the LED group, and a varistor connected in parallel to the leveling capacitor;
When the LED group is disconnected and the voltage applied to both ends of the LED group exceeds a predetermined voltage value, a current flows through the varistor and the leveling capacitor is restricted from being applied with a voltage higher than the predetermined voltage. In addition, the abnormality due to overheating of the varistor is detected, the switching circuit unit switches the switch, the current flowing to the varistor is reduced through the current reducing capacitor, and the leveling capacitor is damaged or deteriorated. The LED illumination circuit according to claim 3, wherein the LED illumination circuit is prevented. The LED lighting circuit according to claim 1, wherein the switch is a manual changeover switch. In addition to the capacitor and the short circuit, the switch of the switching circuit unit can select power off,
When the switch selects the power-off, the path of the current flowing from the AC power supply is cut off, and no current flows through the LED group, and the LED group is turned off so that it does not emit light. 12. The LED illumination circuit according to 1 or 11. A remote control transmitter circuit that wirelessly outputs operation signals is provided.
The switching circuit unit receives the operation signal output from the remote control transmitter circuit, and switches the selection of the capacitor, the short circuit, and the power-off by the switch based on the received operation signal. The LED lighting circuit according to claim 12. An LED lighting tube having a substrate on which a plurality of LEDs are disposed, and a lighting fixture that supports the LED lighting tube;
The LED lighting tube is
A light tube socket for attachment to the lighting fixture;
An LED lighting tube side circuit disposed between the lighting tube socket and the plurality of LEDs,
The lighting fixture is:
A luminaire socket engaging the luminaire socket;
A lighting fixture side circuit disposed between a power input terminal and the lighting fixture socket;
The LED lighting tube side circuit includes a part of the LED lighting circuit according to any one of claims 1 to 13,
The lighting device side circuit includes another part of the LED lighting circuit. The LED lighting device.

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