WO2012066822A1

WO2012066822A1 - Led illumination

Info

Publication number: WO2012066822A1
Application number: PCT/JP2011/066410
Authority: WO
Inventors: 小野　恭裕; 隆浩宮島
Original assignee: アイリスオーヤマ株式会社
Priority date: 2010-11-17
Filing date: 2011-07-20
Publication date: 2012-05-24
Also published as: JPWO2012066822A1; JP2015146327A; JP5732072B2

Abstract

In the present invention, a control circuit (50) performs: a first determination process that determines whether there is an open state or a shorted state between the first terminal and second terminal in each base (21, 22); a second determination process that determines whether or not the voltage between the first terminal and second terminal of at least one of the bases (21, 22) is at or below a baseline voltage value; and a switching process that switches a switch (40) from an off state to an on state when, in the first determination process, it has been determined that there is a shorted state between the first terminal and second terminal of all the bases (21, 22), and, in the second determination process, it has been determined that the voltage between the first terminal and second terminal of at least one of the bases (21, 22) is at or below the baseline voltage value.

Description

LED lighting

The present invention relates to an LED illumination using an LED (Light Emitting Diode) as a light source.

In recent years, with increasing environmental awareness, LED lighting using LEDs with excellent power saving as a light source has been actively used. Particularly recently, straight tube LED lighting in which only a tube body is replaced with LED lighting without changing the mounting base of the fluorescent lamp is also rapidly spreading in lighting apparatuses using fluorescent lamps. However, when this replaceable straight tube LED illumination is used, there are the following problems.

Generally, an external ballast is always attached to a straight tube fluorescent lamp. The ballast applies a high voltage for generating an electric discharge inside the fluorescent lamp at the start of lighting of the fluorescent lamp. If a high voltage is applied when a straight tube type LED illumination is mounted, there is a possibility that the LED which is the light source element and the semiconductor element of the power supply circuit are damaged and deteriorated earlier. Also, the ballast itself could generate heat.

Therefore, there has been an LED lighting device as disclosed in JP 2010-157480 A to solve this problem. The LED lighting device includes a plurality of LEDs connected in parallel or in series, and two electrodes inserted into connection terminals of a fluorescent lighting system for a magnetic or electronic lighting system. A first power supply terminal and a second power supply terminal receiving an input of an AC power supply from the fluorescent lamp lighting system through the terminal; and a first power supply terminal for removing an overvoltage or overcurrent component included in the AC power supply input from the first power supply terminal 1 power supply part, 2nd power supply part which removes the overvoltage or overcurrent component contained in the AC power supply input from the second power supply terminal, and full-wave rectification of the AC voltage output from the first power supply part A first rectification unit; a second rectification unit for full-wave rectification of the AC voltage output from the second; and the first rectification unit coupled in parallel with the output stages of the first rectification unit and the second rectification unit. And the full-wave rectified power in the second rectifier A filter unit that smoothes the pressure and converts it to direct current, and a drive that lights the plurality of LEDs by outputting rated voltages and currents for the plurality of LEDs from a direct current power source output from the filter unit Part.

However, the LED lighting device disclosed in Japanese Patent Application Laid-Open No. 2010-157480 requires a varistor for protecting the circuit from overvoltage and a fuse for protecting from overcurrent on the first power supply terminal side and the second power supply terminal side, Furthermore, since it is necessary to provide the first rectification unit and the second rectification unit on the first power supply terminal side and the second power supply terminal side, respectively, there is a problem that the circuit becomes complicated and expensive.

The present invention has been made in view of the above problems, and according to some aspects of the present invention, an LED illumination that does not damage an LED when connected to a conventional fluorescent lamp fixture is provided. Can be provided.

(1) The LED illumination according to the present invention is
LED,
Two bases each having a first terminal and a second terminal;
A power supply circuit for supplying power to the LED;
A switch for switching whether to supply external power to the power supply circuit via the base;
A control circuit for controlling the switch;
Including
The control circuit includes:
A first determination process for determining whether the first terminal and the second terminal are open or short in each of the caps;
A second determination process for determining whether or not a voltage between the first terminal and the second terminal is equal to or lower than a reference voltage value in at least one of the caps;
In the first determination process, it is determined that any of the bases is in a short state between the first terminal and the second terminal, and in the second determination process, at least one of the bases A switching process for switching the switch from an off state to an on state when it is determined that the voltage between the first terminal and the second terminal is equal to or lower than a reference voltage value;
I do.

According to the present invention, in any of the caps, it is determined that the first terminal and the second terminal are short-circuited, and the voltage between the first terminal and the second terminal in at least one of the caps. Is determined to be less than or equal to the reference voltage value, the switch is switched from the off state to the on state, so that the switch is turned off when connected to a conventional fluorescent lamp fixture. Therefore, it is possible to provide LED lighting that does not damage the LED when connected to a conventional fluorescent lamp fixture.

(2) This LED lighting
The control circuit, in the switching process,
In the first determination process, when it is determined that any of the caps is in an open state between the first terminal and the second terminal, or in the second determination processing, at least one of the caps When it is determined that the voltage between the first terminal and the second terminal exceeds a reference voltage value, the switch may be switched from the on state to the off state.

According to the present invention, when it is determined that the gap between the first terminal and the second terminal is open in any of the caps, or between at least one of the caps between the first terminal and the second terminal. When it is determined that the voltage exceeds the reference voltage value, the switch is switched from the on state to the off state, so that the switch is turned off when connected to a conventional fluorescent lamp fixture. Therefore, it is possible to provide LED lighting that does not damage the LED when connected to a conventional fluorescent lamp fixture.

(3) This LED lighting
The control circuit includes:
A signal output circuit for outputting a voltage signal from the output terminal;
A first resistor having one end connected to the output terminal;
The first terminal of the primary winding is connected to the other end of the first resistor, the first terminal of the secondary winding is connected to the first terminal of one of the caps, and the second terminal of the secondary winding A transformer connected to the second terminal of one of the caps;
A voltage detection circuit for detecting a voltage at a connection point between the first resistor and the transformer;
A first determination circuit that performs the first determination process based on a voltage detected by the voltage detection circuit;
May be included.

Thereby, the first determination process can be performed in a state where the first determination circuit and the external power source are not connected in a direct current manner.

(4) This LED lighting
The control circuit includes:
A photocoupler in which an anode terminal and a cathode terminal are connected via a second resistor between the first terminal and the second terminal of one of the caps;
A second determination circuit that performs the second determination process based on whether the photocoupler is in an ON state;
May be included.

Thus, the second determination process can be performed in a state where the second determination circuit and the external power source are not connected in a direct current manner.

(5) This LED lighting
A current limiting circuit that limits a current value supplied to the control circuit via the base to a reference current value or less may be further included.

According to the present invention, if only one base is connected to the external power source and the other base contacts the human body, only a current equal to or lower than the reference current value limited by the current limiting circuit flows. Therefore, it is possible to provide LED lighting that prevents electric shock that occurs during replacement.

FIG. 1 is a circuit diagram for explaining an LED illumination 1 according to the present embodiment. FIG. 2 is a circuit diagram illustrating a configuration example of the power supply circuit 30. FIG. 3 is a circuit diagram when the LED illumination 1 is connected to a correctly wired lamp. FIG. 4 is a circuit diagram when the LED illumination 1 is connected to a glow-type fluorescent lamp fixture. FIG. 5 is a circuit diagram when the LED illumination 1 is connected to an inverter type fluorescent lamp fixture. FIG. 6 is a circuit diagram when the LED illumination 1 is connected to a rapid start type fluorescent lamp fixture. FIG. 7 is a circuit diagram for explaining a part of the configuration of the control circuit 50. FIG. 8 is a graph illustrating an example of an output signal of the signal output circuit 501 and a voltage input to the A / D converter 503. FIG. 9 is a circuit diagram for explaining a part of the configuration of the control circuit 50. FIG. 10 is a circuit diagram for explaining a part of the configuration of the control circuit 50. FIG. 11 is a circuit diagram showing a state in which the base 21 of the LED lighting 1 according to this embodiment is connected to a socket and the base 22 is in contact with a human body.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The embodiments described below do not unduly limit the contents of the present invention described in the claims. Also, not all of the configurations described below are essential constituent requirements of the present invention.

FIG. 1 is a circuit diagram for explaining an LED illumination 1 according to the present embodiment. In this embodiment, a straight tube type LED illumination whose outer shape is the same as that of a straight tube type fluorescent lamp will be described as an example. However, the present invention is, for example, U-shaped even if the outer shape is similar to a ring type fluorescent lamp. Even if it is the same as a fluorescent lamp, it is applicable.

The LED illumination 1 according to this embodiment includes an LED 10, two

bases

21 and 22 each having a first terminal and a second terminal, a power supply circuit 30 that supplies power to the LED 10, and the

bases

21 and 22. The power supply circuit 30 includes a switch 40 that switches whether external power is supplied or not, and a control circuit 50 that controls the switch 40. The control circuit 50 includes a first terminal and a second terminal in each of the

caps

21 and 22. Whether or not the voltage between the first terminal and the second terminal in the at least one of the

caps

21 and 22 is equal to or lower than the reference voltage value in the first determination process for determining whether the terminal is open or shorted In the second determination process and the first determination process for determining whether the first terminal and the second terminal are short-circuited in any of the

caps

21 and 22, and In the second determination process, when it is determined that the voltage between the first terminal and the second terminal in at least one of the

caps

21 and 22 is equal to or lower than the reference voltage value, the switch 40 is changed from the off state to the on state. And a switching process for switching.

The LED 10 is turned on when power is supplied from the power supply circuit 30. The LED illumination 1 may include a plurality of LEDs as the LED 10. In this case, a plurality of LEDs may be connected in series or in parallel, or both may be combined.

The base 21 has a first terminal 211 and a second terminal 212. The first terminal 211 and the second terminal 212 function as terminals for supplying external power to the LED illumination 1. The base 22 has a first terminal 221 and a second terminal 222. The first terminal 221 and the second terminal 222 function as terminals for supplying external power to the LED illumination 1.

The power supply circuit 30 supplies power to the LED 10. In the example shown in FIG. 1, the first terminal of the power supply circuit 30 is connected to the first terminal 211 of the base 21 via the switch 40, and the second terminal 32 of the power supply circuit 30 is the first terminal 221 of the base 22. It is connected to the. The third terminal 33 of the power supply circuit 30 is connected to the anode side (high potential side) of the LED 10, and the fourth terminal 34 of the power supply circuit 30 is connected to the cathode side (low potential side) of the LED 10.

AC voltage is supplied to the power supply circuit 30 via the

caps

21 and 22. In the present embodiment, the power supply circuit 30 converts AC voltage into DC voltage and supplies power to the LED 10.

FIG. 2 is a circuit diagram illustrating a configuration example of the power supply circuit 30. In the example shown in FIG. 2, the power supply circuit 30 includes a full-wave rectifier bridge circuit for rectifying the alternating current supplied from the first terminal 31 and the second terminal 32 into a direct current, and the like. 301, a noise filter 302 for removing harmonics from the output of the rectifier 301 and outputting, a known power factor improvement circuit 303 for improving the power factor, a known switching circuit and a PWM (PulsePWidth Modulation) circuit The LED driving circuit 304 for causing the LED 10 to emit light by outputting PWM between the third terminal 33 and the fourth terminal 34, a protective fuse, a surge countermeasure varistor, and the like are configured. A protection circuit 305 provided between the terminal 32 and the terminal 32 is included.

The switch 40 switches whether to supply external power to the power supply circuit 30 via the

caps

21 and 22. In the example shown in FIG. 1, the switch 40 is provided between the first terminal 211 of the base 21 and the first terminal 31 of the power supply circuit 30. As the switch 40, various known configurations such as a transistor, a thyristor, a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), an IGBT (Insulated Gate Bipolar Transistor), and a relay circuit can be employed. When the switch 40 is not controlled by the control circuit 50 (for example, when power necessary for the operation of the control circuit 50 is not supplied to the control circuit 50), the switch 40 is off.

The control circuit 50 controls the switch 40. The control circuit 50 may be configured by using a dedicated circuit. For example, a microprocessor (Micro-Processing Unit) is connected to a storage device (not shown) such as a ROM (Read Only Memory) or a RAM (Random Access Memory). The computer may function as a computer by executing a stored control program, and may be configured to perform control described later.

In the example shown in FIG. 1, the first terminal 51 of the control circuit 50 and the first terminal 211 of the base 21 are connected, the second terminal 52 of the control circuit 50 and the second terminal 212 of the base 21 are connected, The third terminal 53 of the control circuit 50 and the first terminal 221 of the base 22 are connected, and the fourth terminal 54 of the control circuit 50 and the second terminal 222 of the base 22 are connected. A switching signal that is a signal for switching the switch 40 is output from the fifth terminal 55 of the control circuit 50.

The control circuit 50 performs a first determination process for determining whether the first terminal and the second terminal are in an open state or a short state in each of the

caps

21 and 22.

FIG. 3 is a circuit diagram when the LED illumination 1 is connected to a correctly wired lamp. FIG. 4 is a circuit diagram when the LED illumination 1 is connected to a glow-type fluorescent lamp fixture. FIG. 5 is a circuit diagram when the LED illumination 1 is connected to an inverter type fluorescent lamp fixture. FIG. 6 is a circuit diagram when the LED illumination 1 is connected to a rapid start type fluorescent lamp fixture.

As shown in FIG. 3, the correctly wired lamp has a first terminal 711 and a second terminal 712 connected to the socket 71 to which the base 21 is connected, and a socket 72 to which the base 22 is connected. The first terminal 721 and the second terminal 722 are connected. Therefore, when the base 21 is connected to the socket 71, the first terminal 211 and the second terminal 212 of the base 21 are short-circuited. Similarly, when the base 22 is connected to the socket 72, the first terminal 221 and the second terminal 222 of the base 22 are short-circuited.

As shown in FIG. 4, in the glow type fluorescent lamp fixture, the first terminal 711 of the socket 71 to which the base 21 is connected and the first terminal 721 of the socket 72 to which the base 22 is connected form the glow lamp 91. The second terminal 712 of the socket 71 to which the base 21 is connected is connected to the second terminal 722 of the socket 72 to which the base 22 is connected via the AC power supply 80 and the ballast 92. Therefore, when the base 21 is connected to the socket 71, the first terminal 211 and the second terminal 212 of the base 21 are open. Similarly, when the base 22 is connected to the socket 72, the first terminal 221 and the second terminal 222 of the base 22 are open.

As shown in FIG. 5, in the inverter type fluorescent lamp fixture, the first terminal 711 of the socket 71 to which the base 21 is connected and the first terminal 721 of the socket 72 to which the base 22 is connected are connected via a capacitor 93. The second terminal 712 of the socket 71 to which the base 21 is connected and the second terminal 722 of the socket 72 to which the base 22 is connected are connected via an AC power supply 80 and a ballast 94. Therefore, when the base 21 is connected to the socket 71, the first terminal 211 and the second terminal 212 of the base 21 are open. Similarly, when the base 22 is connected to the socket 72, the first terminal 221 and the second terminal 222 of the base 22 are open.

As shown in FIG. 6, in the rapid start type fluorescent lamp fixture, in the socket 71 to which the base 21 is connected, the first terminal 711 and the second terminal 712 form the winding of the transformer that constitutes the ballast 95. In the socket 72 to which the base 22 is connected, the first terminal 721 and the second terminal 722 are connected via a transformer winding constituting the ballast 95. Therefore, when the base 21 is connected to the socket 71, the first terminal 211 and the second terminal 212 of the base 21 are short-circuited. Similarly, when the base 22 is connected to the socket 72, the first terminal 221 and the second terminal 222 of the base 22 are short-circuited.

Accordingly, the control circuit 50 determines whether the first terminal 211 and the second terminal 212 of each base 21 and the first terminal 221 and the second terminal 222 of the base 22 are in an open state or a short state. By performing the first determination process, it can be determined that the LED illumination 1 is connected to a correctly wired lamp or rapid start type fluorescent lamp fixture. In other words, by performing the first determination process, it can be determined that the lamp to which the LED illumination 1 is connected is not a glow-type fluorescent lamp fixture or an inverter-type fluorescent lamp fixture.

The control circuit 50 performs a second determination process for determining whether or not the voltage between the first terminal and the second terminal is at or below the reference voltage value in at least one of the

caps

21 and 22. In the following, the case of a correctly wired lamp and a rapid start type fluorescent lamp apparatus that are determined to be in a short state in the first determination process will be described.

As shown in FIG. 3, the correctly wired lamp has a first terminal 711 and a second terminal 712 directly connected in the socket 71 to which the base 21 is connected, and a socket 72 to which the base 22 is connected. The first terminal 721 and the second terminal 722 are directly connected. Therefore, when the base 21 is connected to the socket 71, the resistance between the first terminal 211 and the second terminal 212 of the base 21 is relatively low. Similarly, when the base 22 is connected to the socket 72, the resistance between the first terminal 221 and the second terminal 222 of the base 22 is relatively low. In this case, the voltage between the first terminal 211 and the second terminal 212 of the base 21 or the voltage between the first terminal 221 and the second terminal 222 of the base 22 is equal to or lower than the reference voltage value Vref. Thus, the reference voltage value Vref is set.

As shown in FIG. 6, in the rapid start type fluorescent lamp fixture, in the socket 71 to which the base 21 is connected, the first terminal 711 and the second terminal 712 form the winding of the transformer that constitutes the ballast 95. In the socket 72 to which the base 22 is connected, the first terminal 721 and the second terminal 722 are connected via a transformer winding constituting the ballast 95. Therefore, when the base 21 is connected to the socket 71, the first terminal 211 and the second terminal 212 of the base 21 are relatively relative to each other through the transformer winding constituting the ballast 95. High resistance. Similarly, when the base 22 is connected to the socket 72, the relative distance between the first terminal 221 and the second terminal 222 of the base 22 is through the winding of the transformer constituting the ballast 95. High resistance. In this case, the voltage between the first terminal 211 and the second terminal 212 of the base 21 or the voltage between the first terminal 221 and the second terminal 222 of the base 22 exceeds the reference voltage value Vref. Is set to the reference voltage value Vref.

Therefore, the control circuit 50 performs the second determination process for determining whether or not the voltage between the first terminal and the second terminal in at least one of the

caps

21 and 22 is equal to or lower than the reference voltage value Vref. It can be determined whether the lamp to which the illumination 1 is connected is a correctly wired lamp or a rapid start type fluorescent lamp fixture. That is, if the voltage between the first terminal and the second terminal in at least one of the

caps

21 and 22 is equal to or lower than the reference voltage value Vref, the lamp to which the LED illumination 1 is connected is a rapid start type fluorescent lamp fixture. It can be determined that the lamp is correctly wired.

In the first determination process, the control circuit 50 determines that both the

bases

21 and 22 are in a short state between the first terminal and the second terminal, and in the second determination process, the control circuit 21 and the base 21 When at least one of the terminals 22 determines that the voltage between the first terminal and the second terminal is equal to or lower than the reference voltage value, a switching process for switching the switch 40 from the off state to the on state is performed.

In the first determination process, if it is determined that the first terminal and the second terminal are in a short state in both the

caps

21 and 22, the lamp to which the LED illumination 1 is connected is correctly wired. Or a rapid-start fluorescent lamp fixture. In this case, in the second determination process, if it is determined that the voltage between the first terminal and the second terminal in at least one of the

caps

21 and 22 is equal to or lower than the reference voltage value, the LED illumination 1 is connected. The lit lamp is a correctly wired lamp. That is, when it is determined that the LED illumination 1 is connected to a correctly wired lamp, the control circuit 50 performs a switching process for switching the switch 40 from the off state to the on state. Therefore, when the LED illumination 1 is connected to a conventional fluorescent lamp fixture, the switch 40 remains off. Therefore, it is possible to provide LED lighting that does not damage the LED when connected to a conventional fluorescent lamp fixture.

In the switching process, the control circuit 50 determines in the first determination process that the first terminal and the second terminal are open in any of the

caps

21 and 22, or the second determination process. When it is determined that at least one of the

caps

21 and 22 the voltage between the first terminal and the second terminal exceeds the reference voltage value Vref, the switch 40 is switched from the on state to the off state. Also good. That is, when it is determined that the LED illumination 1 is not connected to a correctly wired lamp, the control circuit 50 performs a switching process for switching the switch 40 from the off state to the on state.

This will turn off the switch when connected to a conventional fluorescent lamp fixture. Therefore, it is possible to provide LED lighting that does not damage the LED when connected to a conventional fluorescent lamp fixture.

The control circuit 50 includes a signal output circuit 501 that outputs a voltage signal from an output terminal 5001, a first resistor 5110 having one end connected to the output terminal 5001, and a first terminal 5211 of the primary winding of the first resistor 5110. The transformer 521 is connected to the other end, the first terminal 5213 of the secondary winding is connected to the first terminal 211 of the base 21, and the second terminal 5214 of the secondary winding is connected to the second terminal 212 of the base 21. A voltage detection circuit 505 that detects a voltage at a connection point between the first resistor 5110 and the transformer 521, and a first determination circuit 507 that performs a first determination process based on the voltage detected by the voltage detection circuit 505. May be included. The control circuit 50 includes a signal output circuit 502 that outputs a voltage signal from the output terminal 5002, a first resistor 5120 that has one end connected to the output terminal 5002, and a first terminal 5221 of the primary winding that is a first resistor. The second terminal of the secondary winding is connected to the first terminal 221 of the base 22, and the second terminal 5224 of the secondary winding is connected to the second terminal 222 of the base 22. A transformer 522; a voltage detection circuit 506 that detects a voltage at a connection point between the first resistor 521 and the transformer 522; and a determination circuit 508 that performs a first determination process based on the voltage detected by the voltage detection circuit 506. May be included.

FIG. 7 is a circuit diagram for explaining a part of the configuration of the control circuit 50. In the example shown in FIG. 7, the circuit on the base 21 side and the circuit on the base 22 side of the control circuit 50 are configured in the same manner. Therefore, the circuit on the base 21 side will be mainly described. The reference numerals of the circuits are shown in parentheses, and detailed description is omitted.

The control circuit 50 includes a microcomputer 500. The microcomputer 500 is a microprocessor, and includes parts that function as a signal output circuit 501 (502), an A / D converter 503 (504), a voltage detection circuit 505 (506), and a first determination circuit 507 (508). Yes.

The signal output circuit 501 (502) outputs a voltage signal from the output terminal 5001 (5002). The voltage signal may be, for example, a rectangular pulse signal or a sine wave AC signal.

The first resistor 5110 (5120) has one end connected to the output terminal 5001 (5002) and the other end connected to the first terminal 5211 (5221) of the primary winding of the transformer 521 (522). It is connected to 500 input terminals 5003 (5004).

The second terminal of the primary winding of the transformer 521 (522) is connected to the ground potential GND. The first terminal 5213 (5223) of the secondary winding of the transformer 521 (522) is connected to the first terminal 211 (221) of the base 21 (22), and the second terminal 5214 (5224) of the secondary winding is a capacitor. It is connected to the second terminal 212 (222) of the base 21 (22) via 531 (532).

FIG. 8 is a graph showing an example of the output signal of the signal output circuit 501 and the voltage input to the A / D converter 503. The horizontal axis represents time, and the vertical axis represents voltage. 8A is an output signal of the signal output circuit 501, and B of FIG. 8 is input to the A / D converter 503 when the first terminal 211 and the second terminal 212 of the base 21 are open. 8C represents the voltage input to the A / D converter 503 when the first terminal 211 and the second terminal 212 of the base 21 are short-circuited.

As shown in FIG. 8A, the signal output circuit 501 outputs a rectangular pulse signal having a relatively high voltage in the period from time t0 to time t1. The length of the period from time t0 to time t1 is preferably shorter as long as the accuracy of the first determination process can be ensured. In the present embodiment, the length of the period from time t0 to time t1 is set to 20 milliseconds or less. When the first terminal 211 and the second terminal 212 of the base 21 are open, the resistance between the first terminal 211 and the second terminal 212 of the base 21 is relatively high. As shown by B in FIG. 8, a relatively high voltage is input to the A / D converter 503. When the first terminal 211 and the second terminal 212 of the base 21 are short-circuited, the resistance between the first terminal 211 and the second terminal 212 of the base 21 is relatively low. As indicated by 8 C, a relatively low voltage is input to the A / D converter 503. Therefore, by appropriately setting the threshold voltage Vth, it can be determined whether the first terminal 211 and the second terminal 212 of the base 21 are in an open state or a short state. Similarly, it can be determined whether the first terminal 221 and the second terminal 222 of the base 22 are in an open state or a short state.

In the example shown in FIG. 7, the voltage detection circuit 505 (506) includes a first resistor 5110 (5120) and a transformer 521 (522) via an input terminal 5003 (5004) and an A / D converter 503 (504). The voltage at the connection point of is detected. The first determination circuit 507 (508) performs a first determination process based on the voltage detected by the voltage detection circuit 505 (506).

Since the control circuit 50 is configured as shown in FIG. 7, the first determination process can be performed in a state where the first determination circuits 507 and 508 (the microcomputer 500) and the external power supply are not connected in a direct current manner. .

At least one of the first terminal 5213 (5223) and the second terminal 5214 (5224) of the secondary winding of the transformer 521 (522) is connected to the first terminal 211 (221) or the second terminal of the base 21 (22) via a capacitor. It may be connected to the two terminals 212 (222). In the example shown in FIGS. 1 and 2, the second terminal 5214 (5224) of the secondary winding of the transformer 521 (522) is connected to the first terminal 211 (221) of the base 21 (22) via the capacitor 531 (532). ) Or the second terminal 212 (222). As a result, the influence of the direct current component included in the external power supply (AC power supply 80) on the control circuit 50 (in particular, the influence on the microcomputer 500 in the example shown in FIG. 7) can be suppressed.

FIG. 9 is a circuit diagram for explaining a part of the configuration of the control circuit 50. The control circuit 50 includes a second terminal between the first terminal 211 and the second terminal 212 of the base (the base 21 or the base 22, which will be described below). A photocoupler 540 connected via a resistor 550 and a second determination circuit 509 that performs a second determination process based on whether the photocoupler 540 is in an on state may be included.

In the example shown in FIG. 9, the control circuit 50 includes a microcomputer 500. The microcomputer 500 is a microprocessor and has portions that function as an A / D converter 509, a voltage detection circuit 510, and a second determination circuit 511.

In the example shown in FIG. 9, the emitter terminal of the photocoupler 540 is connected to the ground potential GND. The collector terminal of the photocoupler 540 is connected to the power supply potential VDD via the third resistor 560 and is also connected to the input terminal 5005 of the microcomputer 500.

In the example shown in FIG. 9, the voltage detection circuit 510 detects the voltage at the connection point between the third resistor 560 and the collector terminal of the photocoupler 540 via the input terminal 5005 and the A / D converter 509. The second determination circuit 511 determines whether or not the photocoupler 540 is on based on the voltage detected by the voltage detection circuit 510. Based on whether or not the photocoupler 540 is on, the second determination circuit performs a second determination process.

By configuring the control circuit 50 as shown in FIG. 9, the second determination process can be performed in a state where the second determination circuit 511 (the microcomputer 500) and the external power source are not connected in a direct current manner.

FIG. 10 is a circuit diagram for explaining a part of the configuration of the control circuit 50. In the example shown in FIG. 10, the control circuit 50 includes a microcomputer 500. The microcomputer 500 is a microprocessor and has portions that function as

first determination circuits

507 and 508, a second determination circuit 511, and a switching circuit 512.

The switching circuit performs switching processing. That is, a switching signal that is a signal for switching the switch 40 based on the results of the first determination processing of the

first determination circuits

507 and 508 and the result of the second determination processing of the second determination circuit 511 is output to the output terminal. Output to the switch 40 via 5006 (may be the same terminal as the fifth terminal 55 of the control circuit 50). As a result, the control circuit 50 can control the switch 40.

The LED illumination 1 may further include a current limiting circuit 60 that limits the current value supplied to the control circuit 50 via the

caps

21 and 22 to a reference current value or less. In the example shown in FIG. 1, in the current limiting circuit 60, the first terminal 61 is connected to the first terminal 211 of the base 21, and the second terminal 62 is connected to the first terminal 221 of the base 22. The current limiting circuit 60 supplies power from the third terminal 63 to the control circuit 50 with a current value equal to or lower than the reference current value based on the power supplied from the first terminal 61 and the second terminal 62. The reference current value is set to a current value that is not regarded as an electric shock. For example, in order to satisfy the standards of the Japanese Electrical Appliance and Material Safety Law, the reference current value is set to 1 mA or less.

FIG. 11 is a circuit diagram showing a state in which the base 21 of the LED lighting 1 according to this embodiment is connected to a socket and the base 22 is in contact with a human body. According to the present embodiment, as shown in FIG. 11, only one base (for example, base 21) is temporarily connected to the external power source (AC power supply 80), and the other base (for example, base 22) is connected to the human body. When M is touched, the switch 40 is in an OFF state, so that only a current equal to or less than the reference current value limited by the current limiting circuit 60 flows. Therefore, it is possible to provide LED lighting that prevents electric shock that occurs during replacement.

Note that the above-described embodiments and modifications are merely examples, and the present invention is not limited to these. For example, a plurality of embodiments and modifications can be combined as appropriate.

The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the present invention includes substantially the same configuration (for example, a configuration having the same function, method and result, or a configuration having the same purpose and effect) as the configuration described in the embodiment. In addition, the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. In addition, the present invention includes a configuration that exhibits the same operational effects as the configuration described in the embodiment or a configuration that can achieve the same object. In addition, the invention includes a configuration in which a known technique is added to the configuration described in the embodiment.

1 LED illumination, 10 LED, 21, 22 base, 30 power supply circuit, 31 first terminal, 32 second terminal, 33 third terminal, 34 fourth terminal, 40 switch, 50 control circuit, 51 first terminal, 52 2nd terminal, 53 3rd terminal, 54 4th terminal, 55 5th terminal, 60 current limit circuit, 71, 72 socket, 80 AC power supply, 91 glow lamp, 92 ballast, 93 condenser, 94 ballast, 95 stable , 211 1st terminal, 212 2nd terminal, 221 1st terminal, 222 2nd terminal, 301 rectifier, 302 noise filter, 303 power factor correction circuit, 304 LED drive circuit, 305 protection circuit, 500 microcomputer, 501, 502 Signal output circuit, 503,504 A / D converter, 505,506 voltage Output circuit, 507, 508, first determination circuit, 509 A / D converter, 510 voltage detection circuit, 511, second determination circuit, 512 switching circuit, 521, 522 transformer, 531, 532 capacitor, 540 photocoupler, 550, second resistance 560, third resistor, 711, first terminal, 712, second terminal, 721, first terminal, 722, second terminal, 5001,5002, output terminal, 5003,5004,5005, input terminal, 5006, output terminal, 5110,5120, first resistor , 5211 1st terminal, 5212 2nd terminal, 5213 1st terminal, 5214 2nd terminal, 5221 1st terminal, 5222 2nd terminal, 5223 1st terminal, 5224 2nd terminal

Claims

LED,
Two bases each having a first terminal and a second terminal;
A power supply circuit for supplying power to the LED;
A switch for switching whether to supply external power to the power supply circuit via the base;
A control circuit for controlling the switch;
Including
The control circuit includes:
A first determination process for determining whether the first terminal and the second terminal are open or short in each of the caps;
A second determination process for determining whether or not a voltage between the first terminal and the second terminal is equal to or lower than a reference voltage value in at least one of the caps;
In the first determination process, it is determined that any of the bases is in a short state between the first terminal and the second terminal, and in the second determination process, at least one of the bases A switching process for switching the switch from an off state to an on state when it is determined that the voltage between the first terminal and the second terminal is equal to or lower than a reference voltage value;
LED lighting.
LED lighting according to claim 1,
The control circuit, in the switching process,
In the first determination process, when it is determined that any of the caps is in an open state between the first terminal and the second terminal, or in the second determination processing, at least one of the caps LED lighting that switches the switch from an on state to an off state when it is determined that the voltage between the first terminal and the second terminal exceeds a reference voltage value.
The LED illumination according to claim 1 or 2,
The control circuit includes:
A signal output circuit for outputting a voltage signal from the output terminal;
A first resistor having one end connected to the output terminal;
The first terminal of the primary winding is connected to the other end of the first resistor, the first terminal of the secondary winding is connected to the first terminal of one of the caps, and the second terminal of the secondary winding A transformer connected to the second terminal of one of the caps;
A voltage detection circuit for detecting a voltage at a connection point between the first resistor and the transformer;
A first determination circuit that performs the first determination process based on a voltage detected by the voltage detection circuit;
LED lighting including
The LED illumination according to any one of claims 1 to 3,
The control circuit includes:
A photocoupler in which an anode terminal and a cathode terminal are connected via a second resistor between the first terminal and the second terminal of one of the caps;
A second determination circuit that performs the second determination process based on whether the photocoupler is in an ON state;
LED lighting including
The LED illumination according to any one of claims 1 to 4,
LED lighting further including a current limiting circuit that limits a current value supplied to the control circuit via the base to a reference current value or less.