JP6075749B2 - LED lamp - Google Patents

Description

  The present invention relates to an LED lamp that can be mounted in common on various start-type lighting fixtures to which a fluorescent lamp is mounted.

  Fluorescent lamps that emit visible light by irradiating the fluorescent material applied to the inner wall of the glass tube with ultraviolet rays generated by the discharge of the filament are used as light sources by various types of lighting fixtures. Typical starting methods for lighting fixtures include a glow start type, a rapid start type, and an inverter type. The inverter type includes a self-excited resonance type, a separately excited resonance type, and a half-bridge type.

  On the other hand, LED lamps using light-emitting diodes having a long life and low power consumption as light sources have been developed. The LED lamp employs an LED instead of a light bulb as a light source. From an LED used as a light source, several tens to several hundreds of LEDs instead of a fluorescent lamp are connected in series, or in series. There are various things, from those connected in parallel to those connected in parallel.

  In the case of an LED lamp that can be used in place of a fluorescent lamp, there is a case where a lighting fixture for a fluorescent lamp is remodeled and mounted, but it is desirable that it can be lit even if it is mounted on a lighting fixture for a fluorescent lamp without modification. . Then, the fluorescent lamp can be replaced with the LED lamp as it is, and it is expected that the spread will be further increased. As LED lamps that can be used in place of such fluorescent lamps, those described in Patent Documents 1 to 3 are known.

  In the LED illumination device of Patent Document 1, the anode side of the LED unit circuit is connected between the rectifier diodes that are the output ends of the respective diode bridges provided between the electrode pins at both ends, and the rectifier diode that is the input end It is described that the cathode side of the LED unit circuit is connected in between, so that the current does not flow to the glow starter due to the action of the rectifier diode even when current is input from one of the electrode pins. .

  In addition, since the lighting fixture of Patent Document 2 includes two diode bridge circuits, two terminals that are not supplied with AC power when AC power is supplied to any two of the four terminal pins. Since there is no influence of the AC power supplied to the pins, it is described that the inverter system and the rapid start system can be used without any modification.

  In addition, in the LED illuminating lamp of Patent Document 3, a resistor and a capacitor having an impedance equivalent to a filament of 10Ω are connected in parallel between the two terminals of the first terminal pin pair and between the two terminals of the second terminal pin pair. By connecting each of the connected devices, in the glow start type, a large current from a commercial power source is passed through a resistor and a capacitor to prevent a failure of the electronic ballast energizing circuit. It is described that current detection between two terminal pins can be performed.

JP 2004-192833 A JP 2008-103304 A JP 2008-277188 A

  However, in the inverter-type fluorescent lamp lighting device, power is supplied to the fluorescent lamp at the rated output. Therefore, the load of the power-saving LED lamp is too low, and the safety mechanism of the lighting fixture may not operate to start. is there. Therefore, even if the conventional LED lamps described in Patent Documents 1 to 3 that are simply rectified by a diode bridge can be lit and mounted on a glow start type or rapid start type lighting fixture, There is a possibility that it cannot be lit.

  In the LED illuminating lamp described in Patent Document 3, a resistor having an impedance equivalent to a filament of 10Ω is connected between the two terminals of the first terminal pin pair and between the two terminals of the second terminal pin pair. Therefore, it seems that it is possible to consume a surplus current more than the LED consumes with this resistor. However, in a lighting fixture modified for mounting an LED lamp, a commercial power supply of 100 V may be directly connected to the socket. Therefore, when a lighting fixture is mounted on such a lighting fixture, a large current flows through the resistor, so There is a risk of dropping the breaker or burning the resistance.

  Therefore, the present invention can be mounted not only with a glow start type, rapid start type, and inverter type lighting fixtures but also with a lighting fixture in which a commercial power source is directly connected to a socket, and an LED lamp capable of saving power in any lighting fixture. The purpose is to provide.

  The LED lamp of the present invention is a lighting control that outputs a driving current based on a pair of terminal pins provided at both ends for mounting on a pair of sockets of a fluorescent lamp luminaire and an alternating current from the pair of terminal pins. And an LED illumination unit that is lit by a drive current from the lighting control unit, the lighting control unit includes a pair of rectification units that rectify alternating current from the pair of terminal pins, and the pair of rectification units. And a current source unit that outputs a drive current based on the pulsating current from the lamp, and is connected in parallel with the current source unit between the pair of rectifying units and is larger than the current consumed by the LED illumination unit. A load portion that consumes surplus current from the lighting fixture is provided.

  According to the LED lamp of the present invention, alternating current is supplied from a pair of terminal pins at both ends, and a driving current to the LED illumination unit is output by the lighting control unit. The inverter-type lighting fixture for fluorescent lamps has a rated output larger than the power consumption of the LED lamp, but the LED lamp of the present invention has a load portion, so that a fluorescent current supplied with a current larger than the current consumed by the LED lighting portion is supplied. The surplus current from the lamp lighting device can be consumed by the load section. Therefore, even if the LED lamp of the present invention is an inverter type lighting device for fluorescent lamps, it can mistakenly recognize that a fluorescent lamp is mounted and can start lighting. Since the load unit is connected in parallel with the current source unit between the pair of rectifier units, the impedance viewed from the rectifier unit is a combined impedance of the load unit and the current source unit. Therefore, since the load portion can have a high resistance, it does not burn even when a high voltage is applied from the socket, and the power consumed by the load portion can be suppressed.

  A pair of the load parts are provided corresponding to the pair of rectification parts, and a first rectification element with a forward direction facing inward is provided on a power supply line between the load part and the current source part, respectively. It is desirable that a second rectifier element having a forward direction outward is provided on a ground line between the load unit and the current source unit.

When the rectifying element is provided in the power supply line between the load unit and the lighting driver and the rectifying element with the forward direction facing inward is provided, the current passing through the first rectifying element is the other side of the opposite side Since it is interrupted by the first rectifier element, it does not flow out. In addition, when the second rectifying element with the forward direction facing outward is provided on the ground line between the load unit and the current source unit, the second rectifying element is connected to the inside through the load unit. Cut off current flow. Accordingly, since the resistance value between the pair of terminal pins can be made high resistance, the present invention can be applied even to an inverter type fluorescent lamp illuminator for confirming the insulating property of the fluorescent lamp between the pair of terminal pins. LED lamps can be recognized as fluorescent lamps.
Here, the outer side means a method facing the terminal pin side, and the inner side means the internal circuit side in the opposite direction.

  If the load part is a resistance element having an inductance component whose impedance increases with increasing frequency, the glow start type and rapid start type are supplied with a high frequency while suppressing wasteful power consumption because they are low frequency. It is an inverter type and can consume a large amount of power.

  In the present invention, since the load portion can have a high resistance, it does not burn even when a high voltage is applied from the socket, and the power consumed by the load portion can be suppressed. It is possible to mount not only a type and inverter type lighting fixture but also a lighting fixture in which a commercial power source is directly connected to a socket, and power saving can be achieved with any lighting fixture.

It is a figure which shows the structure of the LED lamp which concerns on embodiment of this invention. It is a figure of the circuit example of the LED lamp shown in FIG. It is a circuit diagram for demonstrating the LED illumination part of the LED lamp shown in FIG. It is a figure for demonstrating the direction which attaches the LED lamp shown in FIG. 1 to a socket. It is a figure for demonstrating the state which mounted | wore the glow start type fluorescent lamp lighting fixture with the LED lamp shown in FIG. It is a figure for demonstrating the state which mounted | wore the rapid start type fluorescent lamp lighting fixture with the LED lamp shown in FIG. It is a figure for demonstrating the state which mounted | wore the inverter type lighting device for LED lamps shown in FIG. (A) And (B) is a circuit diagram for demonstrating that a load part becomes a substitute of a filament. (A) And (B) is a circuit diagram for demonstrating the function of a rectifier.

The LED lamp which concerns on embodiment of this invention is demonstrated based on drawing.
The LED lamp 10 shown in FIG. 1 is a straight tube lamp that can be mounted on any of the glow start type, rapid start type, and inverter type fluorescent lamp lighting fixtures (hereinafter simply referred to as lighting fixtures). The LED lamp 10 is provided with terminal pins 11 and 12 at both ends for mounting in a pair of sockets of a lighting fixture.

  Between the terminal pins 11 and 12, a lighting control unit 14 that outputs a driving current based on an alternating current from the terminal pins 11 and 12, an LED lighting unit 15 that lights up by the driving current from the lighting control unit 14, and a load The part 16 (161, 162) is connected. The lighting control unit 14 includes rectifying units 141 and 142, a smoothing unit 143, and a current source unit 144.

  The terminal pins 11 and 12 are formed on a base provided at both ends of a cylindrical casing. The terminal pins 11 and 12 are provided with pins 11a and 11b and pins 12a and 12b that are fitted into sockets of a lighting fixture. When the straight tube type LED lamp 10 is held horizontally, the pin 11a and the pin 12a are the same top or bottom. At that time, the pin 11b and the pin 12b are on the opposite side or on the opposite side. That is, the combination of the pin 11a and the pin 12a and the combination of the pin 11b and the pin 12b are at the coaxial line position.

A rectifying element 17 (171, 172) which is the first rectifying element with the forward direction facing inward at a position which is the power line L1 from the rectifying parts 141, 142 and inside the load part 16 and the current source part 144. ) Is inserted. Further, a rectifying element 18 (181, 182), which is a second rectifying element with the forward direction facing outward, is inserted into the ground line L2 from the rectifying units 141, 142 and inside the load unit 16. Has been.
The rectifying units 141 and 142, the lighting control unit 14, the load unit 16, and the rectifying elements 17 and 18 excluding the LED illumination unit 15 are mounted on one printed board.

  The rectifier 141 has an input terminal connected to the terminal pin 11, and the rectifier 142 has an input terminal connected to the terminal pin 12. One output terminal of the rectifying units 141 and 142 is the power supply line L1, and the other output terminal of the rectifying units 141 and 142 is the ground line L2. The rectifiers 141 and 142 perform half-wave rectification or full-wave rectification of the alternating currents from the terminal pins 11 and 12.

  The smoothing unit 143 is connected between the power supply line L1 from the rectifying units 141 and 142 and the ground line L2. The smoothing unit 143 may be connected to any position as long as it is between the power supply line L1 between the rectifying elements 171 and 172 and the ground line L2 between the rectifying elements 181 and 182. The smoothing unit 143 has a function of smoothing the pulsating flow from the rectifying units 141 and 142 to make a direct current. The smoothing unit 143 can be a capacitor.

  The current source unit 144 is connected between the power supply line L1 from the rectifying units 141 and 142 and the ground line L2. The current source unit 144 is a switching power supply that functions as a constant current source that outputs a stable current to the LED illumination unit 15. The voltage (internal reference voltage) that is supplied by the current source unit 144 and turns on the LED lighting unit 15 is a lighting device to be mounted among lighting devices such as a glow start type, a rapid start type, or an inverter type. This is the lowest voltage in the output voltage range to be supplied. That is, the current source unit 144 is set to start the switching operation when the voltage of the power supply line L1 becomes higher than the internal reference voltage.

The LED illumination unit 15 is connected between the power supply line and the current source unit 144. The LED illumination unit 15 is a unit in which a plurality of LEDs connected in series are connected in parallel.
The load unit 161 is connected in parallel between the rectification unit 141 and the current source unit 144, and the load unit 162 is connected in parallel between the rectification unit 142 and the current source unit 144. The load unit 16 has a function of consuming surplus current from the fluorescent lamp luminaire that is larger than the current consumed by the LED illumination unit.
The rectifying elements 17 and 18 have a function of cutting off current from the opposite direction by flowing current only in one direction. Since the rectifying elements 17 and 18 can be used as long as they have a rectifying action, various diodes and transistors can be used.

Next, a specific circuit example of the LED lamp 10 will be described with reference to FIGS.
Further, as the rectifying unit 141, four diodes D <b> 11 to D <b> 14 are connected to the terminal pin 11 as a rectifying unit 141 in a diode bridge. Similarly, the terminal pin 12 and the four diodes D21 to D24 are connected to form a diode bridge. The four diodes D11 to D14 and D21 to D24 are desirably high-switching diodes so that they can be switched even at a high frequency supplied from an inverter-type lighting fixture.

Specifically, the connection point P11 between the anode of the diode D11 and the cathode of the diode D12 is used as an input terminal and is connected to the pin 11a of the terminal pin 11. The connection point P12 between the anode of the diode D13 and the cathode of the diode D14 is connected to the pin 11b of the terminal pin 11 with the connection point P12 as an input end.
A connection point P13 between the cathode of the diode D11 and the cathode of the diode D13 is used as an output terminal and is connected to the power supply line L1. A connection point P14 between the anode of the diode D12 and the anode of the diode D14 is used as an output terminal, and is connected to the ground line L2.
The connection point P21 between the anode of the diode D21 and the cathode of the diode D22 is connected to the pin 12a of the terminal pin 12 with the input terminal P21 as an input end. The connection point P22 between the anode of the diode D23 and the cathode of the diode D24 is connected to the pin 12b of the terminal pin 12 with the input end being an input terminal.
A connection point P23 between the cathode of the diode D21 and the cathode of the diode D23 is connected to the power supply line L1. A connection point P24 between the anode of the diode D22 and the anode of the diode D24 is used as an output terminal, and is connected to the ground line L2.

As the smoothing unit 143, a capacitor C1 is connected between the power supply line L1 and the ground line L2.
Further, as the current source unit 144, a lighting driver DV having a Zener diode ZD interposed between the power supply line L1 and the Vin terminal and having the GND terminal connected to the ground line L2, a transistor Tr, and a transistor Tr A diode D3 connected between the drain D of the transistor Tr1 and the power supply line L1, a resistor R1 connected between the source S of the transistor Tr and the ground line L2, and a gate G of the transistor Tr and the illumination driver DV. And a coil L connected between the drain D of the transistor Tr and the LED lighting unit 15.

The diode D3 functions as a free-wheeling diode that suppresses the voltage drop to the LED illumination unit 15 by blocking the current flow from the power line L1 and returning the delayed current from the coil L to the power line L1. .
The resistor R1 functions as a limiting resistor that limits the current flowing to the LED illumination unit 15, and is a resistor for monitoring the voltage that the illumination driver DV switches. The resistance value of the resistor R1 is a glow start type, a rapid start type, an inverter type, or the like, and when the lowest voltage in the output voltage range to be supplied is applied in the lighting fixture to be mounted, This is determined based on the current flowing to the LED illumination unit 15.
The Zener diode ZD is for preventing an excessive voltage application to the illumination driver DV. The lighting driver DV has a function of monitoring the voltage of the CS terminal (voltage of the resistor R1) and turning on and off the GATE terminal to turn on and off the transistor Tr and perform a switching operation.

  As shown in FIG. 3, the LED illumination unit 15 is configured by connecting nine sets of 17 LEDs connected in series in parallel. The LED illumination unit 15 has an anode side connected to the power supply line L1 and a cathode side connected to the coil L. The number of LEDs can be appropriately changed according to the required illuminance of the LED lamp. Details of the number of LED elements in series in the LED illumination unit 15 will be described later.

As the load part 161, a resistor R3 is connected in parallel between a power supply line L1 from the connection point P13 of the diodes D11 and D13 and a ground line L2 from the connection point P14 of the diodes D12 and D14.
As the load unit 162, a resistor R4 is connected in parallel between the power supply line L1 from the connection P23 of the diodes D21 and D23 and the ground line L2 from the connection point P24 of the diodes D22 and D24. The resistance values of the resistors R3 and R4 can be 10 kΩ.

As the rectifying element 171, a diode D41 is inserted in the power supply line L1 inside the resistor R3 with the forward direction facing inward. As the rectifying element 181, a diode D42 is inserted in the ground line L2 inside the resistor R3 with the forward direction facing outward.
As the rectifying element 172, a diode D51 is inserted in the power supply line L1 inside the resistor R4 with the forward direction facing inward. As the rectifying element 182, a diode D52 is inserted in the ground line L2 inside the resistor R4 with the forward direction facing outward.

The relationship between the series number and the parallel number of the LED illumination part 15 of the LED lamp 10 which concerns on embodiment of this invention comprised as mentioned above, and the drive current of the current source part 144 is demonstrated.
In the 40W type or 32W type glow start type or rapid start type, a voltage of about 90V to about 100V is output. In the 32W type inverter type, a voltage of about 60 V to about 70 V is generally output, and a low voltage of about 50 V is output. Since this voltage varies depending on the ballast, it varies depending on the model and manufacturer.

Further, in the voltage after passing through the rectifying unit 141, the rectifying unit 142, and the smoothing unit 143, there is a voltage drop at each location, and thus the voltage further decreases.
Therefore, about 50V which is the minimum value of the output voltage range of the 32W type inverter type in the output voltage range of the fluorescent tube luminaire to be mounted is set as the reference voltage of the input voltage, the rectifier 141, the rectifier 142, the smoother If the voltage drop by 143 is about 10%, the voltage (internal reference voltage) applied to the LED illumination unit 15 is about 45V.

Assuming that the voltage after smoothing by the smoothing unit 143, about 45V, is the internal reference voltage, and the forward voltage of the LED elements of the LED lighting unit 15 is about 2.7V, the number of LED elements in series can be 17.
Next, the current flowing through the LED element when a voltage of 2.7 V is applied is obtained from the voltage-current characteristics of the LED element. For example, it is assumed that the current when the voltage applied to the LED element is 2.7 V is about 66 mA. Further, the total number of LED elements is calculated from the illuminance required for the LED illumination unit 15, and the total number is divided by 17 in series to calculate the parallel number. For example, the parallel number of 17 LED elements connected in series is 9 rows.

  When the number of parallel elements is obtained, about 66 mA flows in the series connection of one LED element. Therefore, the current source unit 144 needs to drive about 594 mA to the LED illumination units 15 arranged in parallel. When the drive current of the current source unit 144 is obtained in this way, the resistance value of the resistor R1 is calculated based on this drive current. In the present embodiment, the resistance R1 is set to 0.3Ω as a result of calculation based on the standard of the illumination driver DV and experiments.

Next, the operation of the LED lamp according to the embodiment of the present invention will be described based on the drawings.
As shown in FIG. 2, an AC voltage is applied to the terminal pins 11 and 12 although the frequency is different in any of the glow start type, the rapid start type, and the inverter type.
The LED lamp 10 is capable of full-wave rectification of alternating current because the diodes D11 to D14 and the diodes D21 to D24 that constitute a diode bridge are connected to both of the terminal pins 11 and 12.
The pulsating flow due to the full-wave rectification becomes almost a direct current between the power supply line L1 and the ground line L2 by the capacitor C1 to be smoothed.

  When the voltage between the power supply line L1 and the ground line L2 enters the operating range of the lighting driver DV by the power supply from the lighting fixture, the lighting driver DV starts to operate. When the illumination driver DV starts to operate, the GATE terminal outputs an H level by turning on the GATE terminal. When the GATE terminal outputs an H level, the gate of the transistor Tr is turned on, and the drain-source is turned on. As a result, the current from the power supply line L1 flows through the LED illumination unit 15, flows between the drain and source of the transistor Tr via the coil L, and flows to the ground line L2 via the resistor R1. The LED illumination unit 15 is turned on by this current flow.

  The lighting driver DV monitors the voltage generated in the resistor R1 by the current flowing through the resistor R1 by the CS terminal for each cycle of the internal oscillator that oscillates at 80 kHz. If the voltage between the power supply line L1 and the ground line L2 becomes higher than about 45 V that is the internal reference voltage, the voltage of the resistor R1 becomes higher than a predetermined voltage. When the voltage of the resistor R1 becomes higher than a predetermined voltage, the lighting driver DV turns off the GATE terminal in units of cycles. That is, the illumination driver DV turns off the GATE terminal during the cycle period in which the resistance R1 is equal to or higher than the predetermined voltage.

  When the transistor Tr is turned off, a current delayed by the coil L flows as a return current to the power supply line L1 via the diode D3 and flows to the LED illumination unit 15, and thus a voltage drop due to switching of the illumination driver DV is suppressed.

  When the transistor Tr is turned off, the voltage at the resistor R1 is lowered to a predetermined voltage or lower. When the lighting driver DV detects that the voltage of the resistor R1 has become equal to or lower than the predetermined voltage by the CS terminal, the lighting driver DV sets the GATE terminal to the H level again. Therefore, if the voltage between the power supply line L1 and the ground line L2 is higher than about 45V, the lighting driver DV performs a switching operation that is repeatedly turned on and off at a frequency lower than the frequency of the internal oscillator. Is supplied with a constant current.

  The number of LED elements in series and the resistance R1 are determined based on the value of the inverter-type lighting fixture having the lowest output voltage range among the lighting fixtures such as the glow start type, the rapid start type, and the inverter type. Therefore, even if this LED lamp 10 is attached to a glow start type or rapid start type lighting fixture or a lighting fixture that is directly connected to a commercial power supply with the ballast removed, the power line L1 and the ground line L2 Since the voltage is only higher than the internal reference voltage, the LED illumination unit 15 can be stably lit by constant current control in the switching operation by the illumination driver DV.

  In addition, when a voltage lower than that of the reference 32W inverter-type lighting fixture is supplied, the voltage of the resistor R1 is also lowered, so that the GATE terminal of the lighting driver DV is always on. Even when the GATE terminal is always on and the transistor Tr is always on, the voltage between the power supply line L1 and the ground line L2 is low, so the current flowing through the LED illumination unit 15 is less than the forward current. It becomes dark because it becomes small according to the voltage.

For example, in LED lamps mounted on inverter-type lighting fixtures with a larger output than 40W type or LED lamps directly connected to commercial power supply 100V, the number of LED elements in series is based on inverter-type lighting fixtures of type 32. More than the LED lamp.
In the LED lamp directly connected to the commercial power supply 100V, when the internal reference voltage is about 90V and the forward voltage of the LED element is about 2.7V, the number of series is 33, compared with 17 of the LED lamp 10 in series. Will increase.
When such an LED lamp is mounted on a lighting fixture having a low output voltage, the voltage drop due to the entire LED elements connected in series is large. Therefore, even if the transistor Tr is always on and current is supplied to the LED lighting unit, each LED Since sufficient current cannot be supplied to the element, it is impossible to emit light that can be visually recognized.

  However, since the LED lamp 10 has a series number of LED elements based on the 32 type inverter type lighting fixture, the LED lamp 10 is mounted on a lighting fixture whose output voltage is lower than that of the 32 type inverter type lighting fixture, and the power line L1. Even if a sufficient voltage cannot be applied to the ground line L2, since the voltage drop by the LED illumination unit 15 is low, a current that can be visually recognized by the LED element can be supplied. Accordingly, the current source unit 144 supplies the LED illumination unit 15 with a current corresponding to the decrease in the supply voltage, so that the LED illumination unit 15 gradually becomes dark according to the decrease in the applied voltage, but can be turned on.

Next, the direction in which the LED lamp 10 is mounted on the lighting fixture will be described with reference to FIG. There are four directions for attaching the LED lamp 10 to the lighting fixture. That is, as shown in FIG. 4A, the terminal pin 11 is attached to the left socket, and the terminal pin 12 is attached to the right socket, and the opposite case as shown in FIG. 4B. 4A and 4B, and the pins 11a and 11b and the pins 12a and 12b in FIG. 4A and FIG. 4B are interchanged by rotation around the axis, There are two types as shown in FIG. Therefore, there are four ways in total.
4A to 4D, even if the terminal pins 11 and 12 are replaced in the socket, the rectifying unit 141 is provided on the terminal pin 11 side, and the rectifying unit 142 is provided on the terminal pin 12 side. Since the diode bridge is rotationally symmetric, any of the glow start type, the rapid start type and the inverter type can be mounted on the socket regardless of the direction.

Here, functions of the load unit 16 and the rectifying element 17.18 when the LED lamp 10 is mounted on various starting-type lighting fixtures will be described with reference to the drawings.
In the glow start type lighting device shown in FIG. 5 and the rapid start type lighting device shown in FIG. 6, the ballast is a coil, so that the lighting device supplies current according to the current consumed by the LED lamp 10. However, in the inverter-type lighting fixture shown in FIG. 7, a fluorescent lamp that cannot flow a predetermined current cannot be turned on with a power-saving conventional LED lamp because the lighting fixture safety mechanism operates and does not start lighting. . For example, there is a type 32 inverter type lighting fixture that checks that about 390 mA flows.
The LED illumination unit 15 consumes about 594 mA when the internal reference voltage is 45V. That is, the power consumption is about 26.7W. When the current consumption in the commercial power source is calculated by dividing approximately 26.7 W by 100 V, the current consumption is 267 mA. That is, the LED lamp 10 consumes approximately 267 mA, but the inverter-type lighting fixture needs to flow approximately 390 mA. Therefore, it is necessary to flow a surplus current having a difference of 123 m in the LED lamp 10.

  In the LED lamp 10, as shown in FIG. 2, a current also flows through the resistors R <b> 3 and R <b> 4 of the load units 161 and 162 and consumes power. Accordingly, the surplus current supplied in excess of the current consumed by the LED illumination unit 15 can be sufficiently consumed by the resistors R3 and R4. Therefore, it can be recognized that the fluorescent lamp is attached to the inverter-type lighting fixture.

In a lighting fixture that has been modified so that commercial power is directly applied to the socket, 100 V AC is applied to each of the pins 11 a and 11 b of the terminal pin 11 and the pins 12 a and 12 b of the terminal pin 12. In this case, in the LED lighting described in Patent Document 3, a resistor having an impedance equivalent to 10 Ω is connected between the two terminals of the first terminal pin pair and between the two terminals of the second terminal pin pair. Therefore, there is a risk of burning due to a large current flowing through the resistor.
However, in the LED lamp 10, since the resistors R3 and R4 are arranged inside the diodes D11 to D14 and D21 to D24 that constitute the diode bridge, the illumination that is the capacitor C1 that is the smoothing unit 143 and the current source unit 144 is provided. Since this is a parallel circuit with the driver DV, this combined impedance is lower than the impedance of the resistors R3 and R4 itself. Accordingly, the resistors R3 and R4 can be set to a high resistance such as 10 kΩ, so that even if a high voltage is applied from the socket, the resistors R3 and R4 are not burned, and the power consumed by the resistors R3 and R4 can be suppressed. Even lighting fixtures that supply AC 100V can be lit without problems.

  Further, in the glow start type or rapid start type lighting fixture, since a low-frequency current from a commercial power supply of 50 Hz or 60 Hz flows through the resistors R3 and R4, the impedance due to the inductance components of the resistors R3 and R4 does not increase so much. The resistance element has an inductance component and a capacitance component in addition to the resistance value due to the pure resistance. However, in the commercial power supply, with an alternating current of 50 Hz or 60 Hz, the inductance component and capacitance component of the resistance element are negligible. Therefore, wasteful consumption due to the resistors R3 and R4 can be suppressed.

  Further, in the LED lamp 10, for example, when an inverter type 80 kHz high frequency is supplied from the socket, the full wave rectification is performed by the rectifying units 141 and 142, and a double pulsating flow of 160 kHz is generated. The inductance component of R4 acts to increase the impedance. Therefore, compared with the glow start type or the rapid start type, it is possible to increase the power consumption by the resistors R3 and R4 whose impedance increases with an increase in frequency.

  In the inverter-type lighting fixture shown in FIG. 7, whether or not the fluorescent lamp is mounted in the socket when the power is turned on by passing a direct current through the filament of the fluorescent lamp and checking for continuity before starting the lighting. There is something to check. This is called a fluorescent lamp drop detection function that prevents the fluorescent lamp from being dropped because it is mounted in an incomplete state. If it is determined in this check that the fluorescent lamp is not attached to the lighting fixture, the process does not proceed to start.

  Therefore, in order to avoid this, in the LED lamp 10, as shown in FIG. 8 (A), resistors R3 and R4 are connected as load portions 141 and 142 between the power supply line L1 and the ground line L2. Yes. By doing so, the direct current from the pin 11a flows through the diode D11, the resistor R3, and the diode D14, and is output from the pin 11b. As shown in FIG. 8B, the direct current from the pin 11b flows through the diode D13, the resistor R3, and the diode D12, and is output from the pin 11b. As shown in FIG. 8A, the direct current from the pin 12a flows through the diode D21, the resistor R4, and the diode D24, and is output from the pin 12b. As shown in FIG. 8B, the direct current from the pin 12b flows through the diode D23, the resistor R4, and the diode D22, and is output from the pin 12a. In this way, since the direct current from the terminal pins 11 and 12 flows through the load parts 161 and 162 (resistors R3 and R4), the resistors R3 and R4 can be made to function as detected parts instead of filaments. Even with an inverter-type lighting fixture, lighting can be started.

  Moreover, in the inverter type lighting fixture, before starting lighting, a voltage is applied between the opposing sockets to inspect whether or not the pair of terminals of the fluorescent lamp is in an insulated state. This is because the state of the fluorescent lamp is confirmed by confirming the insulation state because the resistance value between the pair of filaments of the fluorescent lamp is close to infinity.

  In the LED lamp 10, as shown in FIG. 9A, since the diodes D41 and D51 are inserted into the power supply line L1 with the forward direction facing inward, the diode D11 passes from the pin 11a or from the pin 11b. The current that has passed through the diode D13 or the like passes through the diode D41 and is then blocked by the diode D51. Further, the current passing through the diode D21 from the pin 12a and passing through the diode D23 from the pin 12b and passing through the diode D51 is blocked by the diode D41.

  Furthermore, as shown in FIG. 9B, since the diodes D42 and 52 are inserted in the ground line L21 with the forward direction facing outward, the diode D11 passes from the pin 11a or the diode D13 passes from the pin 11b. The current that has passed through is blocked by the diode D42 after passing through the resistor R3. Further, the current passing through the diode D21 from the pin 12a or passing through the diode D23 from the pin 12b is blocked by the diode D52 after passing through the resistor R4.

  As described above, in the LED lamp 10, the power supply line L1 between the load parts 161 and 162 and the current source part 144 is provided with the rectifying elements 171 and 172 with the forward direction facing inward, and the load parts 161 and 162 and Since the rectifying elements 181 and 182 with the forward direction facing outward are provided on the ground line L2 between the current source unit 144 and the terminal pin 11 and the terminal pin 12, the high resistance state is achieved. Therefore, the LED lamp 10 can be recognized as a fluorescent lamp by an inverter-type lighting fixture and can be turned on.

  As described above, the LED lamp 10 can be turned on without any trouble even if it is not only a glow start type, a rabbit start type, and an inverter type lighting fixture but also a lighting fixture in which a commercial power source is directly connected to the socket. Further, by using the load unit 16 as the resistors R3 and R4, power can be consumed with a simple circuit.

  The LED lamp 10 is provided with a smoothing unit 143 for smoothing the pulsating flow from the rectifying units 141 and 142. However, if an illumination driver that operates by pulsating flow is used as the current source unit 144, the smoothing unit 143 The part 143 can be omitted.

  Since the LED lamp of the present invention can be mounted instead as long as it is a lighting fixture to which a fluorescent lamp is mounted, it is suitable as a substitute for a straight tube fluorescent lamp or a bent fluorescent lamp.

DESCRIPTION OF SYMBOLS 10 LED lamp 11,12 Terminal pin 11a, 11b Pin 12a, 12b Pin 14 Lighting control part 141,142 Rectification part 143 Smoothing part 144 Current source part 15 LED illumination part 16,161,162 Load part 17,171,172 Rectifier 18, 181, 182 Rectifier C1 Capacitor D11-D14, D21-D24, D3 Diode D41, D42, D51, D52 Diode P11, P12, P21, P22 Connection point P13, P14, P23, P24 Connection point L Coil R1, R2 , R3, R4 Resistance L1 Power supply line L2 Ground line DV Lighting driver Tr transistor ZD Zener diode

Claims (2)

A pair of terminal pins provided at both ends for mounting on a pair of sockets of a fluorescent lighting fixture;
A lighting control unit that outputs a drive current based on alternating current from the pair of terminal pins;
An LED illumination unit that is lit by a drive current from the lighting control unit,
The lighting control unit
A pair of rectifiers for rectifying the alternating current from the pair of terminal pins, respectively;
A current source unit that outputs a drive current based on the pulsating flow from the pair of rectifying units,
It is connected in parallel with the current source unit between the pair of rectifier, a load unit that consumes the surplus current caused by the current from the fluorescent lamp lighting apparatus wherein the LED lighting unit is rather large supply than the current consumed by the A pair corresponding to the pair of rectification units ,
A power supply line between the load unit and the current source unit is provided with a first rectifier element with a forward direction facing inward, and a ground line between the load unit and the current source unit is connected to the power line. 2. An LED lamp, wherein a second rectifying element having a direction directed outward is provided . The load unit, LED lamp of claim 1 Symbol mounting a resistance element having an inductance component whose impedance increases with increasing frequency.

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