WO2014170958A1

WO2014170958A1 - Led lamp lighting apparatus and method for controlling led lamp lighting apparatus

Info

Publication number: WO2014170958A1
Application number: PCT/JP2013/061309
Authority: WO
Inventors: 高嶋　豊隆
Original assignee: 新電元工業株式会社
Priority date: 2013-04-16
Filing date: 2013-04-16
Publication date: 2014-10-23
Also published as: TWI554151B; JP5654175B1; IN2014DN03506A; JPWO2014170958A1; TW201442568A

Abstract

An LED lamp lighting apparatus (100) is connected between a first power supply terminal (TS1) on the low potential side of a lamp drive power supply (10), and a second power supply terminal (TS2) on the high potential side of the lamp drive power supply, and receives supply of a drive current from the lamp drive power supply (10), thereby lighting a plurality of LED lamps by means of the drive current, said LED lamps being connected in series.

Description

LED lamp lighting device and control method of LED lamp lighting device

The present invention relates to an LED lamp lighting device and a method for controlling the LED lamp lighting device.

In general, LED (Light Emitting Diode) lamps can be driven at a low voltage and have longer life, lower power consumption, faster reaction speed, and higher impact resistance than filament lamps (bulb lamps). Therefore, the size and weight can be reduced.

For this reason, the LED lamp can be suitably used for, for example, a vehicle headlamp.

As an example of such an LED lamp driving device, for example, there is an LED lighting control device as disclosed in JP 2012-160413 A.

The LED lighting control device described in Japanese Patent Application Laid-Open No. 2012-160413 can detect an LED open error with a simple circuit configuration and determine an LED voltage that does not cause the LED open error.

However, when a plurality of LED lamps connected in series are driven by a single driver circuit as in the LED lighting control device disclosed in Japanese Patent Laid-Open No. 2012-160413, any one of the LED lamps is destroyed (disconnected). ) If this happens, there is a problem that all LED lamps are turned off. The LED lighting control device described in Japanese Patent Application Laid-Open No. 2012-160413 cannot operate in the same manner as a conventional general bulb lamp lighting device.

An LED lamp lighting device according to an embodiment according to one aspect of the present invention,
Connected between a first power supply terminal on the low potential side and a second power supply terminal on the high potential side of the lamp drive power supply, receives a drive current from the lamp drive power supply, and is connected in series by the drive current. An LED lamp lighting device for lighting a plurality of LED lamps,
A first external terminal connected to the first power supply terminal;
A second external terminal connected to the second power supply terminal;
A first lamp circuit comprising one LED lamp or a plurality of LED lamps connected in series, one end of which is connected to the first external terminal;
A second lamp circuit composed of one LED lamp or a plurality of LED lamps connected in series, one end of which is connected to the other end of the first lamp circuit;
A third lamp having one LED lamp or a plurality of LED lamps connected in series, one end connected to the other end of the second lamp circuit and the other end connected to the second external terminal Circuit,
Between a first reference node and a first contact connected to the first external terminal, or a second reference node and a second contact connected to the other end of the first ramp circuit. A first switch circuit that conducts only one of the contacts of
Between a second reference node connected to the other end of the first ramp circuit and a third contact connected to the first reference node, or between the second reference node and a fourth A second switch circuit that conducts only one of the contacts;
Between the third reference node connected to the first reference node and the fifth contact connected to the second external terminal, between the third reference node and the sixth contact Or a third switch circuit that conducts only one of the third reference node and a seventh contact connected to the other end of the second ramp circuit;
A diode having a cathode connected to the other end of the second ramp circuit and an anode connected to the fourth contact;
A switching element having one end connected to the fourth contact and the other end connected to the second external terminal;
A switch control circuit for controlling the switch element in accordance with a potential difference between the fourth contact and the second external terminal;
The switch control circuit includes:
When the magnitude of the potential difference between the fourth contact and the second external terminal is equal to or higher than a preset reference voltage, the switch element is turned on,
When the magnitude of the potential difference between the fourth contact and the second external terminal is less than the reference voltage, the switch element is turned off.

In the LED lamp lighting device,
The first lamp circuit, the second lamp circuit, and the third lamp circuit are extinguished by short-circuiting between the first external terminal and the second external terminal. Features.

In the LED lamp lighting device,
The switch element is a thyristor having a cathode connected to the fourth contact and an anode connected to the second external terminal.

In the LED lamp lighting device,
The switch control circuit includes:
A first resistor having one end connected to the fourth contact and the other end connected to the gate of the thyristor;
A second resistor having one end connected to the other end of the first resistor;
A Zener diode having an anode connected to the other end of the second resistor and a cathode connected to the second external terminal.

In the LED lamp lighting device,
The lamp driving power source is
A first input terminal connected to one end of the alternator;
A second input terminal connected to the other end of the AC generator;
A power switch element having one end connected to the first input terminal and the other end connected to the first power terminal;
A capacitor having one end connected to the other end of the power switch element and the other end connected to the second input terminal;
A detection resistor having one end connected to the second input terminal and the other end connected to the second power supply terminal;
When the current flows through the detection resistor, the power switch element is controlled so that the current flowing through the detection resistor is constant. On the other hand, when the current does not flow through the detection resistor, the first resistor A drive control circuit that controls the power switch element so that a voltage between a power supply terminal and the second power supply terminal is a predetermined voltage set in advance.

In the LED lamp lighting device,
The power switch element is a thyristor having a cathode connected to the first input terminal, an anode connected to the first power supply terminal, and a gate to which a control signal is input from the drive control circuit. And

In the LED lamp lighting device,
The lamp driving power source is
It has a constant voltage control function and a constant current control function,
When a current can be supplied to any one of the first lamp circuit, the second lamp circuit, and the third lamp circuit, a constant current is supplied to the LED lamp by the constant current control function. ,
When no current can flow through any of the LED lamps in the first lamp circuit, the second lamp circuit, and the third lamp circuit, the constant voltage control function causes the first power supply terminal to The output voltage output between the second power supply terminal is raised to a predetermined voltage set in advance and limited to a constant voltage.

In the LED lamp lighting device,
The one end of the first lamp circuit is a cathode side of the LED lamp of the first lamp circuit;
The other end of the first lamp circuit is an anode side of the LED lamp of the first lamp circuit;
The one end of the second lamp circuit is a cathode side of the LED lamp of the second lamp circuit;
The other end of the second lamp circuit is an anode side of the LED lamp of the second lamp circuit;
The one end of the third lamp circuit is a cathode side of the LED lamp of the third lamp circuit;
The other end of the third lamp circuit is an anode side of the LED lamp of the third lamp circuit.

In the LED lamp lighting device,
The first switch circuit, the second switch circuit, and the third switch circuit are manually controlled by a user.

In the LED lamp lighting device,
The LED lamp of the first lamp circuit is a high beam lamp of a vehicle headlamp,
The LED lamp of the second lamp circuit is a low beam lamp of the headlamp,
The LED lamp of the third lamp circuit is a position lamp of the vehicle.

The control method of the LED lamp lighting device according to one aspect of the present invention includes:
Connected between a first power supply terminal on the low potential side and a second power supply terminal on the high potential side of the lamp drive power supply, receives a drive current from the lamp drive power supply, and is connected in series by the drive current. An LED lamp lighting device for lighting a plurality of LED lamps, a first external terminal connected to the first power supply terminal, a second external terminal connected to the second power supply terminal, A first lamp circuit composed of one LED lamp or a plurality of LED lamps connected in series, one end of which is connected to the first external terminal, and one LED lamp or a plurality of LEDs connected in series A second lamp circuit having one end connected to the other end of the first lamp circuit, and one LED lamp or a plurality of LED lamps connected in series, and one end being the second lamp circuit. Lamp circuit Between a third ramp circuit connected to the other end, the other end connected to the second external terminal, a first reference node, and a first contact connected to the first external terminal Or a first switch circuit that conducts only one of the first reference node and a second contact connected to the other end of the first ramp circuit, and the first switch circuit. Between the second reference node connected to the other end of the ramp circuit and the third contact connected to the first reference node, or between the second reference node and the fourth contact A second switch circuit that conducts only one of them, a third reference node connected to the first reference node, and a fifth contact connected to the second external terminal. Or between the third reference node and the sixth contact, or between the third reference node and the second ramp circuit. A third switch circuit that conducts only one of the seventh contact connected to the other end, a cathode connected to the other end of the second ramp circuit, and an anode connected to the fourth contact A switch element having one end connected to the fourth contact and the other end connected to the second external terminal; and between the fourth contact and the second external terminal. A switch control circuit for controlling the switch element in accordance with the potential difference of the LED lamp lighting device comprising:
When the magnitude of the potential difference between the fourth contact and the second external terminal is equal to or higher than a preset reference voltage, the switch element is turned on,
When the magnitude of the potential difference between the fourth contact and the second external terminal is less than the reference voltage, the switch element is turned off.

An LED lamp driving device according to an aspect of the present invention is connected between a low-potential-side first power supply terminal and a high-potential-side second power supply terminal of a lamp drive power supply. The plurality of LED lamps connected in series with the drive current are turned on by the supply. The LED lamp lighting device includes a first external terminal connected to the first power supply terminal, a second external terminal connected to the second power supply terminal, and a plurality of LED lamps connected in series. The first lamp circuit is composed of an LED lamp, one end of which is connected to the first external terminal, and one LED lamp or a plurality of LED lamps connected in series, and one end of the first lamp circuit. It consists of a second lamp circuit connected to the other end and one LED lamp or a plurality of LED lamps connected in series, with one end connected to the other end of the second lamp circuit and the other end being the second. A third ramp circuit connected to the external terminal of the first, a first reference node, and a first contact connected to the first external terminal, or a first reference node, Any one between the second contact point connected to the other end of the ramp circuit Between a first switch circuit conducting only one, a second reference node connected to the other end of the first ramp circuit, and a third contact connected to the first reference node, or , A second switch circuit that conducts only one of the second reference node and the fourth contact point, a third reference node connected to the first reference node, and a second external Between the fifth contact connected to the terminal, between the third reference node and the sixth contact, or between the third reference node and the other end of the second ramp circuit. A third switch circuit that conducts only one of the first and second contacts, a diode having a cathode connected to the other end of the second lamp circuit, an anode connected to the fourth contact, and one end Is connected to the fourth contact and the other end is connected to the second external terminal, the fourth contact and the second contact According to the potential difference between the external terminal comprises a switch control circuit for controlling the switching element.

The switch control circuit turns on the switch element when the magnitude of the potential difference between the fourth contact and the second external terminal is equal to or higher than a preset reference voltage, When the magnitude of the potential difference with the second external terminal is less than the reference voltage, the switch element is turned off.

Thereby, the LED lamp lighting device according to the present invention can operate in the same manner as a conventional general bulb lamp lighting device.

FIG. 1 is a circuit diagram illustrating an example of a configuration of an LED lamp lighting device according to a first embodiment which is an aspect of the present invention. FIG. 2 is a diagram showing a relationship between on / off of each switch of a general bulb lamp lighting device and lighting of each bulb lamp. FIG. 3 is a diagram illustrating a relationship between on / off of each switch of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 and lighting of each LED lamp. FIG. 4 is a circuit diagram illustrating an example of an operation during a normal operation in which the LED lamp of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 has not failed. FIG. 5 is a circuit diagram illustrating an example of an operation during a normal operation in which the LED lamp of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is not malfunctioning. FIG. 6 is a circuit diagram illustrating an example of an operation during normal operation in which the LED lamp of the lamp lighting device 100 according to the first embodiment illustrated in FIG. FIG. 7 is a circuit diagram illustrating an example of an operation during a normal operation in which the LED lamp of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is not malfunctioning. FIG. 8 is a circuit diagram illustrating an example of an operation during a normal operation in which the LED lamp of the lamp lighting device 100 according to the first embodiment illustrated in FIG. FIG. 9 is a circuit diagram illustrating an example of an operation during a normal operation in which the LED lamp of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is not malfunctioning. FIG. 10 is a circuit diagram illustrating an example of an operation during a normal operation in which the LED lamp of the lamp lighting device 100 according to the first embodiment illustrated in FIG. FIG. 11 is a circuit diagram illustrating an example of operation during normal operation in which the LED lamp of the lamp lighting device 100 according to the first embodiment illustrated in FIG. FIG. 12 is a circuit diagram illustrating an example of an operation during a normal operation in which the LED lamp of the lamp lighting device 100 according to the first embodiment illustrated in FIG. FIG. 13 is a circuit diagram illustrating an example of an operation during a normal operation in which the LED lamp of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is not malfunctioning. FIG. 14 is a circuit diagram illustrating an example of an operation during a normal operation in which the LED lamp of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is not malfunctioning. FIG. 15 is a circuit diagram illustrating an example of operation during normal operation in which the LED lamp of the lamp lighting device 100 according to the first embodiment illustrated in FIG. FIG. 16 is a diagram showing a relationship between on / off of each switch of a general bulb lamp lighting device and lighting of each bulb lamp when the position lamp Po is out of order. FIG. 17 is a diagram illustrating a relationship between on / off of each switch of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 and lighting of each LED lamp when the position lamp Po is out of order. FIG. 18 is a circuit diagram illustrating an example of an operation when the position lamp Po of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is out of order. FIG. 19 is a circuit diagram showing an example of the operation when the position lamp Po of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order. FIG. 20 is a circuit diagram illustrating an example of the operation when the position lamp Po of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is out of order. FIG. 21 is a circuit diagram showing an example of the operation when the position lamp Po of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order. FIG. 22 is a circuit diagram illustrating an example of an operation when the position lamp Po of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is out of order. FIG. 23 is a circuit diagram illustrating an example of the operation when the position lamp Po of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is out of order. FIG. 24 is a circuit diagram illustrating an example of an operation when the position lamp Po of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is out of order. FIG. 25 is a circuit diagram illustrating an example of an operation when the position lamp Po of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is out of order. FIG. 26 is a circuit diagram illustrating an example of the operation when the position lamp Po of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is out of order. FIG. 27 is a circuit diagram showing an example of the operation when the position lamp Po of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order. FIG. 28 is a circuit diagram illustrating an example of the operation when the position lamp Po of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is out of order. FIG. 29 is a circuit diagram illustrating an example of an operation when the position lamp Po of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is out of order. FIG. 30 is a diagram showing a relationship between on / off of each switch of a general bulb lamp lighting device and lighting of each bulb lamp when the low beam lamp Lo is out of order. FIG. 31 is a diagram illustrating a relationship between on / off of each switch of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 and lighting of each LED lamp when the low beam lamp Lo is malfunctioning. . FIG. 32 is a circuit diagram illustrating an example of the operation when the low beam lamp Lo of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is out of order. FIG. 33 is a circuit diagram showing an example of the operation when the low beam lamp Lo of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order. FIG. 34 is a circuit diagram showing an example of the operation when the low beam lamp Lo of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order. FIG. 35 is a circuit diagram illustrating an example of the operation when the low beam lamp Lo of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is out of order. FIG. 36 is a circuit diagram showing an example of the operation when the low beam lamp Lo of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order. FIG. 37 is a circuit diagram showing an example of the operation when the low beam lamp Lo of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order. FIG. 38 is a circuit diagram illustrating an example of an operation when the low beam lamp Lo of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is out of order. FIG. 39 is a circuit diagram showing an example of the operation when the low beam lamp Lo of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order. FIG. 40 is a circuit diagram illustrating an example of the operation when the low beam lamp Lo of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is out of order. FIG. 41 is a circuit diagram illustrating an example of the operation when the low beam lamp Lo of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is out of order. FIG. 42 is a circuit diagram illustrating an example of the operation when the low beam lamp Lo of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is out of order. FIG. 43 is a circuit diagram illustrating an example of the operation when the low beam lamp Lo of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is out of order. FIG. 44 is a diagram showing a relationship between on / off of each switch of a general bulb lamp lighting device and lighting of each bulb lamp when the high beam lamp Hi is out of order. FIG. 45 is a diagram illustrating a relationship between on / off of each switch of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 and lighting of each LED lamp when the high beam lamp Hi is out of order. . FIG. 46 is a circuit diagram showing an example of the operation when the high beam lamp Hi of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order. FIG. 47 is a circuit diagram showing an example of the operation when the high beam lamp Hi of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order. FIG. 48 is a circuit diagram showing an example of operation when the high beam lamp Hi of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order. FIG. 49 is a circuit diagram showing an example of the operation when the high beam lamp Hi of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order. FIG. 50 is a circuit diagram illustrating an example of an operation when the high beam lamp Hi of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 is out of order. FIG. 51 is a circuit diagram showing an example of the operation when the high beam lamp Hi of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order. FIG. 52 is a circuit diagram showing an example of the operation when the high beam lamp Hi of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order. FIG. 53 is a circuit diagram showing an example of the operation when the high beam lamp Hi of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order. FIG. 54 is a circuit diagram showing an example of the operation when the high beam lamp Hi of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order. FIG. 55 is a circuit diagram showing an example of operation when the high beam lamp Hi of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order. FIG. 56 is a circuit diagram showing an example of operation when the high beam lamp Hi of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order. FIG. 57 is a circuit diagram showing an example of the operation when the high beam lamp Hi of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order.

Hereinafter, each embodiment according to the present invention will be described with reference to the drawings.

FIG. 1 is a circuit diagram showing an example of the configuration of an LED lamp lighting device according to a first embodiment which is an aspect of the present invention. The example shown in FIG. 1 is an example of a headlamp of a vehicle, for example.

As shown in FIG. 1, a lamp driving power source 10 is connected to the LED lamp lighting device 100. An AC generator G is connected to the lamp driving power source 10.

Here, the AC generator G is a single-phase AC generator, and is configured to generate AC power by rotating in conjunction with an engine of a vehicle, for example.

One end G1 of the AC generator G is connected to the first input terminal TI1 of the lamp driving power source 10, and the other end G2 is grounded. The AC generator G is configured to output the generated AC voltage VA to the lamp driving power source 10.

The first power supply terminal TS1 on the negative voltage side (low potential side) of the lamp driving power supply 10 is connected to the external terminal Ta1 of the LED lamp lighting device 100, and the positive voltage side (high potential side) of the lamp driving power supply 10 is connected. The second power supply terminal TS2 is connected to the external terminal Ta2 of the LED lamp lighting device 100. The lamp driving power supply 10 supplies the LED lamp driving current to the LED lamp lighting device 100.

That is, the LED lamp lighting device 100 is connected between the low-potential-side first power supply terminal TS1 and the high-potential-side second power supply terminal TS2 of the lamp drive power supply 10, and the drive current from the lamp drive power supply 10 is reduced. A plurality of LED lamps connected in series are lit by the drive current when supplied.

For example, as shown in FIG. 1, the LED lamp lighting device 100 includes a first external terminal Ta1, a second external terminal Ta2, a first lamp circuit L1, a second lamp circuit L2, 3 lamp circuit L3, first switch circuit SW1, second switch circuit SW2, third switch circuit SW3, switch element SCR, diode D, and switch control circuit C1.

The first external terminal Ta1 is connected to the first power supply terminal TS1.

The second external terminal Ta2 is connected to the second power supply terminal TS2.

The first lamp circuit L1 includes one LED lamp or a plurality of LED lamps connected in series, and one end is connected to the first external terminal Ta1. In the example of FIG. 1, the first lamp circuit L1 is configured by connecting two LED lamps in series.

As shown in FIG. 1, one end of the first lamp circuit L1 is the cathode side of the LED lamp of the first lamp circuit L1. The other end of the first lamp circuit L1 is the anode side of the LED lamp of the first lamp circuit L1.

The LED lamp of the first lamp circuit L1 is, for example, a high beam lamp (for example, a driving headlamp) Hi of a vehicle headlamp.

The second lamp circuit L2 includes one LED lamp or a plurality of LED lamps connected in series, and one end is connected to the other end of the first lamp circuit L1. In the example of FIG. 1, the second lamp circuit L2 is configured by connecting two LED lamps in series.

As shown in FIG. 1, one end of the second lamp circuit L2 is the cathode side of the LED lamp of the second lamp circuit L2. The other end of the second lamp circuit L2 is the anode side of the LED lamp of the second lamp circuit L2.

The LED lamp of the second lamp circuit L2 is, for example, a low beam lamp (for example, a headlight for passing) Lo of the headlamp.

The third lamp circuit L3 includes one LED lamp or a plurality of LED lamps connected in series, one end connected to the other end of the second lamp circuit L2, and the other end to the second external terminal Ta2. It is connected to the. In the example of FIG. 1, the third lamp circuit L3 is composed of one LED lamp.

As shown in FIG. 1, one end of the third lamp circuit L3 is the cathode side of the LED lamp of the third lamp circuit L3. The other end of the third lamp circuit L3 is the anode side of the LED lamp of the third lamp circuit L3.

The LED lamp of the third lamp circuit L3 is, for example, the position lamp Po of the vehicle.

The first switch circuit SW1 includes a first reference node NB1 and the first contact NS1 connected to the first external terminal Ta1, or the first reference node NB1 and the first reference node NB1. Only one of the second contacts NS2 connected to the other end of the lamp circuit L1 is conducted.

The first switch circuit SW1 is a switch for turning on (passing) the high lamp of the headlamp of the vehicle described above.

The second switch circuit SW2 is between the second reference node NB2 connected to the other end of the first ramp circuit L1 and the third contact NS3 connected to the first reference node NB1, or Only one of the second reference node NB2 and the fourth contact NS4 is conducted.

The second switch circuit SW2 is a switch for switching between the high beam and the low beam of the vehicle headlamp described above.

The third switch circuit SW3 includes a third reference node between the third reference node NB3 connected to the first reference node NB1 and the fifth contact NS5 connected to the second external terminal Ta2. Between NB3 and the sixth contact NS6, or only between the third reference node NB3 and the seventh contact NS7 connected to the other end of the second ramp circuit L2. It is designed to conduct.

The third switch circuit SW3 is a switch for controlling the lighting of the vehicle position lamp and the lighting or extinguishing of each lamp.

Note that the first switch circuit SW1, the second switch circuit SW2, and the third switch circuit SW3 are manually controlled by the user.

The diode D has a cathode connected to the other end of the second ramp circuit L2, and an anode connected to the fourth contact NS4.

The switch element SCR has one end connected to the fourth contact NS4 and the other end connected to the second external terminal Ta2. As shown in FIG. 1, the switch element SCR is a thyristor having a cathode connected to the fourth contact NS4 and an anode connected to the second external terminal Ta2.

The switch control circuit C1 controls the switch element SCR according to the potential difference between the fourth contact NS4 and the second external terminal Ta2.

For example, the switch control circuit C1 is configured such that the magnitude (absolute value) of the potential difference between the fourth contact NS4 (one end (cathode) of the switch element SCR) and the second external terminal Ta2 is a preset reference voltage. In the above case, the switch element SCR is turned on. The reference voltage is compared with the magnitude (absolute value) of the value (the same applies hereinafter).

On the other hand, the switch control circuit C1 is configured such that the magnitude (absolute value) of the potential difference between the fourth contact NS4 (one end (cathode) of the switch element SCR) and the second external terminal Ta2 is less than the reference voltage. The switch element SCR is turned off.

As shown in FIG. 1, the switch control circuit C1 includes, for example, a first resistor R1, a second resistor R2, and a Zener diode Ze.
The first resistor R1 has one end connected to the fourth contact NS4 and the other end connected to the gate of the thyristor (switch element) SCR.

The second resistor R2 has one end connected to the other end of the first resistor R1.

The Zener diode Ze has an anode connected to the other end of the second resistor R2 and a cathode connected to the second external terminal Ta2.

The switch control circuit C1 is configured to monitor the voltage of the fourth contact NS4 by the first resistor R1, the second resistor R2, and the Zener diode Ze.

That is, when the potential difference (absolute value) between the fourth contact and the second external terminal Ta2 becomes larger than the reference voltage, the Zener diode Ze is turned on, and a current flows through the second resistor R2. It is configured to flow.

Then, the Zener diode Ze is turned on, and a current flows through the second resistor R2, whereby a voltage is generated between the anode and the gate of the switch element (thyristor) SCR. This voltage causes a gate current to flow through the gate of the switch element SCR, and the switch element SCR is turned on.

The reference voltage can be set to a desired value based on the resistance values of the first resistor R1 and the second resistor R2 and the breakdown voltage of the Zener diode Ze.

Here, the lamp driving power supply 10 described above includes, for example, a first input terminal TI1, a second input terminal TI2, a first power supply terminal TS1, and a second power supply terminal, as shown in FIG. TS2, a power switch element X, a capacitor CX, a detection resistor RX, and a drive control circuit CON are included.

The first input terminal TI1 is connected to one end G1 of the AC generator G.

The second input terminal TI2 is connected to the other end G2 of the AC generator G via a ground.

The power switch element X has one end connected to the first input terminal TI1 and the other end connected to the first power terminal TS1.

As shown in FIG. 1, the power switch element X has, for example, a cathode connected to the first input terminal TI1, an anode connected to the first power terminal TS1, and a gate having a control signal from the drive control circuit CON. Is a thyristor to which is input.

The capacitor CX has one end connected to the other end of the power switch element X and the other end connected to the second input terminal TI2. This capacitor CX is a smoothing capacitor (electrolytic capacitor).

The detection resistor RX has one end connected to the second input terminal TI2 and the other end connected to the second power supply terminal TS2.

When the current flows through the detection resistor RX, the drive control circuit CON controls the power switch element X so that the current flowing through the detection resistor RX is constant.

As a result, the power switch element (thyristor) X rectifies the negative-side voltage of the AC voltage VA output from the AC generator G by half-wave rectification based on the control of the drive control circuit CON, and supplies it to the LED lamp lighting device 100. A drive current is supplied. The power switch element (thyristor) X charges the capacitor CX during the conduction period. The capacitor CX serves as a rectifying and smoothing capacitor for supplying current to the LED lamp lighting device 100 during the non-conduction period of the power switch element (thyristor) X.

That is, the drive control circuit CON controls the conduction timing (ignition phase) of the power switch element (thyristor) X so that the effective value or average value of the current flowing through the LED lamp lighting device 100 is constant.

On the other hand, when no current flows through the detection resistor RX, the drive control circuit CON is configured so that the potential difference between the first power supply terminal TS1 and the second power supply terminal TS2 becomes a preset specified voltage. The power switch element X is controlled.

As described above, the lamp driving power source 10 has a constant voltage control function and a constant current control function.

That is, when the lamp driving power source 10 can supply a current to any of the LED lamps in the first lamp circuit L1, the second lamp circuit L2, and the third lamp circuit L3, the constant current control function Then, a constant current is passed through the LED lamp (a constant current is output from the second power supply terminal TS2).

In addition, here, the case where the current can be supplied to the LED lamp is a case where the LED lamp is not broken (conducted).

On the other hand, when the lamp driving power source 10 cannot pass current (fails) to any of the LED lamps in the first lamp circuit L1, the second lamp circuit L2, and the third lamp circuit L3. By the constant voltage control function, the output voltage output between the first power supply terminal TS1 and the second power supply terminal TS2 is raised to a preset specified voltage to be a constant voltage.

In addition, here, the case where the current cannot be supplied to the LED lamp is a case where the LED lamp is broken (disconnected) and is in an open load state.

Here, the operation of the LED lamp lighting device 100 having the above configuration will be described.

First, the operation during normal operation in which the LED lamp of the lamp lighting device 100 is not broken will be described.

FIG. 2 is a diagram showing a relationship between on / off of each switch of a general bulb lamp lighting device and lighting of each bulb lamp. FIG. 3 is a diagram illustrating a relationship between on / off of each switch of the lamp lighting device 100 according to the first embodiment illustrated in FIG. 1 and lighting of each LED lamp. FIGS. 4 to 15 are circuit diagrams showing an example of operation during normal operation in which the LED lamp of the lamp lighting device 100 according to the first embodiment shown in FIG.

For example, in the example of FIG. 4, the first switch circuit SW1 is electrically connected between the first reference node NB1 and the first contact NS1. Further, the second switch circuit SW2 conducts between the second reference node NB2 and the third contact NS3. The third switch circuit SW3 is electrically connected between the third reference node NB3 and the fifth contact NS5.

That is, the user switches the first switch circuit SW1 to turn off the passing, the second switch circuit SW2 to switch the low beam lamp Lo, and the third switch to turn off the lighting. The switch circuit SW3 is switched.

Thereby, the current i supplied from the lamp driving power supply 10 flows through the path of “third switch circuit SW3 → first switch circuit SW1”. That is, the first external terminal Ta1 and the second external terminal Ta2 are short-circuited. As a result, the first to third lamp circuits L1 to L3 are turned off (FIG. 3).

Next, in the example of FIG. 5, the first switch circuit SW1 is electrically connected between the first reference node NB1 and the second contact NS2. Further, the second switch circuit SW2 conducts between the second reference node NB2 and the third contact NS3. The third switch circuit SW3 is electrically connected between the third reference node NB3 and the fifth contact NS5.

That is, the user switches the first switch circuit SW1 to turn on the passing, the second switch circuit SW2 to switch the low beam lamp Lo, and the third switch to turn off the lighting. The switch circuit SW3 is switched.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “third switch circuit SW3 → second switch circuit SW2 → first lamp circuit L1”. As a result, a total of two high beam lamps Hi are turned on (FIG. 3).

Next, in the example of FIG. 6, the first switch circuit SW1 is electrically connected between the first reference node NB1 and the first contact NS1. Further, the second switch circuit SW2 conducts between the second reference node NB2 and the fourth contact NS4. The third switch circuit SW3 is electrically connected between the third reference node NB3 and the fifth contact NS5.

That is, the first switch circuit SW1 is switched by the user to turn off the passing, the second switch circuit SW2 is switched so that the high beam lamp Hi is selected, and the third switch is turned off to turn off the lighting. The switch circuit SW3 is switched.

Thereby, the current i supplied from the lamp driving power source 10 flows through the path of “third switch circuit SW3 → first lamp circuit L1”. That is, the first external terminal Ta1 and the second external terminal Ta2 are short-circuited. As a result, the first to third lamp circuits L1 to L3 are turned off (FIG. 3).

Next, in the example of FIG. 7, the first switch circuit SW1 is electrically connected between the first reference node NB1 and the second contact NS2. Further, the second switch circuit SW2 conducts between the second reference node NB2 and the fourth contact NS4. The third switch circuit SW3 is electrically connected between the third reference node NB3 and the fifth contact NS5.

That is, the user switches the first switch circuit SW1 to turn on the passing, the second switch circuit SW2 to switch the high beam lamp Hi, and the third switch to turn off the lighting. The switch circuit SW3 is switched.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “third switch circuit SW3 → first switch circuit SW1 → first lamp circuit L1”. As a result, a total of two high beam lamps Hi are turned on (FIG. 3).

Next, in the example of FIG. 8, the first switch circuit SW1 is electrically connected between the first reference node NB1 and the first contact NS1. Further, the second switch circuit SW2 conducts between the second reference node NB2 and the third contact NS3. The third switch circuit SW3 conducts between the third reference node NB3 and the seventh contact NS7.

That is, the user switches the first switch circuit SW1 so as to turn off the passing, the second switch circuit SW2 is switched so that the low beam lamp Lo is selected, and the position lamp Po is turned on. The third switch circuit SW3 is switched.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “third lamp circuit L3 → third switch circuit SW3 → first switch circuit SW1”. As a result, a total of one position lamp Po is turned on (FIG. 3).

Next, in the example of FIG. 9, the first switch circuit SW1 is electrically connected between the first reference node NB1 and the second contact NS2. Further, the second switch circuit SW2 conducts between the second reference node NB2 and the third contact NS3. The third switch circuit SW3 conducts between the third reference node NB3 and the seventh contact NS7.

That is, the user switches the first switch circuit SW1 so as to turn on the passing, the second switch circuit SW2 is switched so that the low beam lamp Lo is selected, and the position lamp Po is turned on. The third switch circuit SW3 is switched.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “third lamp circuit L3 → third switch circuit SW3 → second switch circuit SW2 → first lamp circuit L1”. As a result, a total of three lamps, the high beam lamp Hi and the position lamp Po, are lit (FIG. 3).

Next, in the example of FIG. 10, the first switch circuit SW1 is electrically connected between the first reference node NB1 and the first contact NS1. Further, the second switch circuit SW2 conducts between the second reference node NB2 and the fourth contact NS4. The third switch circuit SW3 conducts between the third reference node NB3 and the seventh contact NS7.

That is, the first switch circuit SW1 is switched by the user so as to turn off the passing, the second switch circuit SW2 is switched so that the high beam lamp Hi is selected, and the position lamp Po is turned on. The third switch circuit SW3 is switched.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “third lamp circuit L3 → third switch circuit SW3 → first lamp circuit L1”. As a result, a total of one position lamp Po is turned on (FIG. 3).

Next, in the example of FIG. 11, the first switch circuit SW1 is electrically connected between the first reference node NB1 and the second contact NS2. Further, the second switch circuit SW2 conducts between the second reference node NB2 and the fourth contact NS4. The third switch circuit SW3 conducts between the third reference node NB3 and the seventh contact NS7.

That is, the user switches the first switch circuit SW1 so as to turn on the passing, the second switch circuit SW2 is switched so that the high beam lamp Hi is selected, and the position lamp Po is turned on. The third switch circuit SW3 is switched.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “third lamp circuit L3 → third switch circuit SW3 → first switch circuit SW1 → first lamp circuit L1”. As a result, a total of three lamps, the high beam lamp Hi and the position lamp Po, are lit (FIG. 3).

Next, in the example of FIG. 12, the first switch circuit SW1 is electrically connected between the first reference node NB1 and the first contact NS1. Further, the second switch circuit SW2 conducts between the second reference node NB2 and the third contact NS3. The third switch circuit SW3 conducts between the third reference node NB3 and the sixth contact NS6.

That is, the first switch circuit SW1 is switched by the user to turn off the passing, the second switch circuit SW2 is switched so that the low beam lamp Lo is selected, and the third switch is turned on to turn on the lighting. The switch circuit SW3 is switched.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “third lamp circuit L3 → second lamp circuit L2 → second switch circuit SW2 → first switch circuit SW1”. As a result, a total of three lamps, the low beam lamp Lo and the position lamp Po, are lit (FIG. 3).

Next, in the example of FIG. 13, the first switch circuit SW1 is electrically connected between the first reference node NB1 and the second contact NS2. Further, the second switch circuit SW2 conducts between the second reference node NB2 and the third contact NS3. The third switch circuit SW3 conducts between the third reference node NB3 and the sixth contact NS6.

That is, the user switches the first switch circuit SW1 to turn on the passing, the second switch circuit SW2 to switch the low beam lamp Lo, and the third switch to turn on the lighting. The switch circuit SW3 is switched.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “third lamp circuit L3 → second lamp circuit L2 → first lamp circuit L1”. As a result, all of the high beam lamp Hi, the low beam lamp Lo, and the position lamp Po are turned on (FIG. 3).

Next, in the example of FIG. 14, the first switch circuit SW1 is electrically connected between the first reference node NB1 and the first contact NS1. Further, the second switch circuit SW2 conducts between the second reference node NB2 and the fourth contact NS4. The third switch circuit SW3 conducts between the third reference node NB3 and the sixth contact NS6.

That is, the user switches the first switch circuit SW1 to turn off the passing, the second switch circuit SW2 to switch the high beam lamp Hi, and the third switch to turn on the lighting. The switch circuit SW3 is switched.

Here, in the LED lamp lighting device 100, when the first external terminal Ta1 and the second external terminal Ta2 are short-circuited, the first lamp circuit L1, the second lamp circuit L2, and the first 3 lamp circuit L3 is extinguished (for example, the state of FIG. 6 with lighting turned OFF). Then, for example, the third switch circuit SW3 is switched to turn the lighting from OFF (for example, the state of FIG. 6) to ON (for example, the state of FIG. 14). In this case, a current is supplied to the first ramp circuit L1, the second ramp circuit L2, and the third ramp circuit L3 from a state where the first external terminal Ta1 and the second external terminal Ta2 are short-circuited. Flows, and the potential difference between the first external terminal Ta1 and the second external terminal Ta2 gradually increases. Thereby, the rush current when the lighting is switched from OFF to ON can be suppressed.

Next, in the example of FIG. 15, the first switch circuit SW1 is electrically connected between the first reference node NB1 and the second contact NS2. Further, the second switch circuit SW2 conducts between the second reference node NB2 and the fourth contact NS4. The third switch circuit SW3 conducts between the third reference node NB3 and the sixth contact NS6.

That is, the user switches the first switch circuit SW1 so as to turn on the passing, the second switch circuit SW2 is switched so that the high beam lamp Hi is selected, and the third switch so as to turn on the lighting. The switch circuit SW3 is switched.

In the case of the normal operation shown in FIGS. 4 to 15, the switch control circuit C1 does not operate, and the switch control circuit C1 does not affect the current i.

As described above, the operation (FIG. 3) in the normal operation in which the LED lamp of the lamp lighting device 100 according to the first embodiment has not failed is the lighting state when the high beam lamp Hi is selected and the lighting is turned on. Except for the difference, the operation is the same as that of the general bulb lamp lighting device shown in FIG.

Next, the operation when the position lamp Po of the lamp lighting device 100 is broken will be described.

FIG. 16 is a diagram showing a relationship between on / off of each switch of a general bulb lamp lighting device and lighting of each bulb lamp when the position lamp Po is out of order. FIG. 17 is a diagram showing a relationship between on / off of each switch of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 and lighting of each LED lamp when the position lamp Po is out of order. is there. FIGS. 18 to 29 are circuit diagrams showing an example of the operation when the position lamp Po of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order.

For example, in the example of FIG. 18, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the current i supplied from the lamp driving power supply 10 flows through the path of “third switch circuit SW3 → first switch circuit SW1”. That is, the first external terminal Ta1 and the second external terminal Ta2 are short-circuited. As a result, the first to third lamp circuits L1 to L3 are turned off (FIG. 17).

Next, in the example of FIG. 19, the state of the first to third switch circuits SW1 to SW3 is the same as the state shown in FIG.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “third switch circuit SW3 → second switch circuit SW2 → first lamp circuit L1”. As a result, a total of two high beam lamps Hi are turned on (FIG. 17).

Next, in the example of FIG. 20, the state of the first to third switch circuits SW1 to SW3 is the same as the state shown in FIG.

Thereby, the current i supplied from the lamp driving power source 10 flows through the path of “third switch circuit SW3 → first lamp circuit L1”. That is, the first external terminal Ta1 and the second external terminal Ta2 are short-circuited. As a result, the first to third lamp circuits L1 to L3 are turned off (FIG. 17).

Next, in the example of FIG. 21, the state of the first to third switch circuits SW1 to SW3 is the same as the state shown in FIG.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “third switch circuit SW3 → first switch circuit SW1 → first lamp circuit L1”. As a result, a total of two high beam lamps Hi are turned on (FIG. 17).

In the case shown in FIGS. 18 to 21, the switch control circuit C1 does not operate and the switch control circuit C1 does not affect the current i.

Next, in the example of FIG. 22, the state of the first to third switch circuits SW1 to SW3 is the same as the state shown in FIG.

Here, in the state of each of the switch circuits SW1 to SW3, the current i does not flow because the position lamp Po is out of order. However, at this time, as described above, the lamp drive power supply 10 is preset with an output voltage to be output between the first power supply terminal TS1 and the second power supply terminal TS2 by the constant voltage control function. The voltage is raised to a specified voltage and limited to a certain voltage. Thereby, when the magnitude of the potential difference between the fourth contact NS4 and the second external terminal Ta2 becomes equal to or higher than the reference voltage, the switch control circuit C1 turns on the switch element SCR.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “switch element SCR → diode D → third switch circuit SW3 → first switch circuit SW1”. That is, the first external terminal Ta1 and the second external terminal Ta2 are short-circuited. As a result, the first to third lamp circuits L1 to L3 are turned off (FIG. 17).

Next, in the example of FIG. 23, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Then, the switch control circuit C1 turns on the switch element SCR according to the operation principle described with reference to FIG.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “switch element SCR → diode D → third switch circuit SW3 → second switch circuit SW2 → first lamp circuit L1”. As a result, a total of two high beam lamps Hi are turned on (FIG. 17).

Next, in the example of FIG. 24, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Next, in the example of FIG. 25, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the current i supplied from the lamp driving power source 10 flows through the path “switch element SCR → second switch circuit SW2 → first lamp circuit L1”. As a result, a total of two high beam lamps Hi are turned on (FIG. 17).

Next, in the example of FIG. 26, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path “switch element SCR → diode D → second lamp circuit L2 → second switch circuit SW2 → first switch circuit SW1”. As a result, a total of two low beam lamps Lo are lit (FIG. 17).

Next, in the example of FIG. 27, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “switch element SCR → diode D → second lamp circuit L2 → first lamp circuit L1”. As a result, a total of four lamps, the high beam lamp Hi and the low beam lamp Lo, are lit (FIG. 17).

Next, in the example of FIG. 28, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Next, in the example of FIG. 29, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

As described above, the operation (FIG. 17) in the case where the position lamp Po of the lamp lighting device 100 according to the first embodiment has failed is failed in the position lamp Po of the general bulb lamp lighting device shown in FIG. The operation is equivalent to

Next, the operation when the low beam lamp Lo of the lamp lighting device 100 is out of order will be described.

FIG. 30 is a diagram showing a relationship between ON / OFF of each switch of a general bulb lamp lighting device and lighting of each bulb lamp when the low beam lamp Lo is out of order. FIG. 31 is a diagram showing a relationship between on / off of each switch of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 and lighting of each LED lamp when the low beam lamp Lo is out of order. It is. FIGS. 32 to 43 are circuit diagrams showing an example of the operation when the low beam lamp Lo of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order.

For example, in the example of FIG. 32, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the current i supplied from the lamp driving power supply 10 flows through the path of “third switch circuit SW3 → first switch circuit SW1”. That is, the first external terminal Ta1 and the second external terminal Ta2 are short-circuited. As a result, the first to third lamp circuits L1 to L3 are turned off (FIG. 31).

Next, in the example of FIG. 33, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “third switch circuit SW3 → second switch circuit SW2 → first lamp circuit L1”. As a result, a total of two high beam lamps Hi are turned on (FIG. 31).

Next, in the example of FIG. 34, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Next, in the example of FIG. 35, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “third switch circuit SW3 → first switch circuit SW1 → first lamp circuit L1”. As a result, a total of two high beam lamps Hi are turned on (FIG. 31).

Next, in the example of FIG. 36, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “third lamp circuit L3 → third switch circuit SW3 → first switch circuit SW1”. As a result, one of the position lamps Po lights up (FIG. 31).

Next, in the example of FIG. 37, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “third lamp circuit L3 → third switch circuit SW3 → second switch circuit SW2 → first lamp circuit L1”. As a result, a total of three lamps, the position lamp Po and the high beam lamp Hi, are lit (FIG. 31).

Next, in the example of FIG. 38, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

That is, the user switches the first switch circuit SW1 so as to turn off the passing, the second switch circuit SW2 is switched so that the high beam lamp Hi is selected, and the position lamp Po is turned on. The third switch circuit SW3 is switched.

Next, in the example of FIG. 39, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “third lamp circuit L3 → third switch circuit SW3 → first switch circuit SW1 → first lamp circuit L1”. As a result, a total of three lamps, the position lamp Po and the high beam lamp Hi, are lit (FIG. 31).

Next, in the example of FIG. 40, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Here, in the state of each of the switch circuits SW1 to SW3, the current i does not flow because the low beam lamp Lo has failed.

Thereby, the first to third lamp circuits L1 to L3 are turned off.

Next, in the example of FIG. 41, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the first to third lamp circuits L1 to L3 are turned off.

In the case shown in FIGS. 32 to 41, the switch control circuit C1 does not operate, and the switch control circuit C1 does not affect the current i.

Next, in the example of FIG. 42, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Here, in the state of each of the switch circuits SW1 to SW3, the current i does not flow because the low beam lamp Lo has failed. However, at this time, as described above, the lamp drive power supply 10 is preset with an output voltage to be output between the first power supply terminal TS1 and the second power supply terminal TS2 by the constant voltage control function. The voltage is raised to a specified voltage and limited to a certain voltage. Thereby, when the magnitude of the potential difference between the fourth contact NS4 and the second external terminal Ta2 becomes equal to or higher than the reference voltage, the switch control circuit C1 turns on the switch element SCR.

Thereby, the current i supplied from the lamp driving power source 10 flows through the path “switch element SCR → second switch circuit SW2 → first lamp circuit L1”. As a result, a total of two high beam lamps Hi are turned on (FIG. 31).

Next, in the example of FIG. 43, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

That is, the user switches the first switch circuit SW1 to turn on the passing, the second switch circuit SW2 to switch the high beam lamp Hi, and the third switch to turn on the lighting. The switch circuit SW3 is switched.

As described above, the operation when the low beam lamp Lo of the lamp lighting device 100 according to the first embodiment is out of order (FIG. 31) is the lighting state when the low beam lamp Lo is selected and lighting is turned on. Except for the difference, the operation is the same as when the low-beam lamp Lo of the general bulb lamp lighting device shown in FIG. 30 is out of order.

Next, the operation when the high beam lamp Hi of the lamp lighting device 100 is broken will be described.

FIG. 44 is a diagram showing a relationship between on / off of each switch of a general bulb lamp lighting device and lighting of each bulb lamp when the high beam lamp Hi is out of order. FIG. 45 is a diagram showing a relationship between on / off of each switch of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 and lighting of each LED lamp when the high beam lamp Hi is out of order. It is. 46 to 57 are circuit diagrams showing an example of the operation when the high beam lamp Hi of the lamp lighting device 100 according to the first embodiment shown in FIG. 1 is out of order.

For example, in the example of FIG. 46, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the current i supplied from the lamp driving power supply 10 flows through the path of “third switch circuit SW3 → first switch circuit SW1”. That is, the first external terminal Ta1 and the second external terminal Ta2 are short-circuited. As a result, the first to third lamp circuits L1 to L3 are extinguished (FIG. 45).

Next, in the example of FIG. 47, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Here, in the state of each of the switch circuits SW1 to SW3, the current i does not flow because the high beam lamp Hi has failed.

Thereby, the first to third lamp circuits L1 to L3 are extinguished (FIG. 45).

Next, in the example of FIG. 48, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the current i supplied from the lamp driving power source 10 flows through the path of “third switch circuit SW3 → first lamp circuit L1”. That is, the first external terminal Ta1 and the second external terminal Ta2 are short-circuited. As a result, the first to third lamp circuits L1 to L3 are extinguished (FIG. 45).

Next, in the example of FIG. 49, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the first to third lamp circuits L1 to L3 are extinguished (FIG. 45).

Next, in the example of FIG. 50, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “third lamp circuit L3 → third switch circuit SW3 → first switch circuit SW1”. As a result, one of the position lamps Po lights up (FIG. 45).

Next, in the example of FIG. 51, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the first to third lamp circuits L1 to L3 are extinguished (FIG. 45).

Next, in the example of FIG. 52, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “third lamp circuit L3 → third switch circuit SW3 → second switch circuit SW1”. As a result, one of the position lamps Po lights up (FIG. 45).

Next, in the example of FIG. 53, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the first to third lamp circuits L1 to L3 are extinguished (FIG. 45).

Next, in the example of FIG. 54, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the current i supplied from the lamp driving power source 10 flows through a path of “third lamp circuit L3 → second lamp circuit L2 → second switch circuit SW2 → first switch circuit SW1”. As a result, a total of three lamps, the position lamp Po and the low beam lamp Lo, are lit (FIG. 45).

Next, in the example of FIG. 55, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the first to third lamp circuits L1 to L3 are extinguished (FIG. 45).

Next, in the example of FIG. 56, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the first to third lamp circuits L1 to L3 are extinguished (FIG. 45).

Next, in the example of FIG. 57, the states of the first to third switch circuits SW1 to SW3 are the same as the state shown in FIG.

Thereby, the first to third lamp circuits L1 to L3 are extinguished (FIG. 45).

In the case shown in FIGS. 46 to 57, the switch control circuit C1 does not operate, and the switch control circuit C1 does not affect the current i.

As described above, the operation (FIG. 45) in the case where the high beam lamp Hi of the lamp lighting device 100 according to the first embodiment is out of order is turned on when the high beam lamp Hi is selected and the position lamp Po is turned on. Except for a part of the state being different, the operation is the same as when the high beam lamp Hi of the general bulb lamp lighting device shown in FIG. 44 is out of order.

As described above, according to the LED lamp lighting device 100 according to the present invention, an operation equivalent to that of a conventional general bulb lamp lighting device can be performed.

In addition, even when the LED lamp is damaged, the user can control the lighting of each LED lamp by operating each switch circuit.

Furthermore, even in the type of LED lamp (position lamp Po) that is not synchronized with the high beam lamp Hi / low beam lamp Lo, the operation of the high beam lamp Hi / low beam lamp Lo is less affected at the time of failure.

Furthermore, as described above, in the LED lamp lighting device 100, the first external terminal Ta1 and the second external terminal Ta2 are short-circuited, whereby the first lamp circuit L1 and the second lamp circuit. L2 and the third lamp circuit L3 are turned off. Then, for example, the first lamp is switched from the state in which the first external terminal Ta1 and the second external terminal Ta2 are short-circuited by switching the third switch circuit SW3 to turn the lighting from OFF to ON. A current flows through the circuit L1, the second ramp circuit L2, and the third ramp circuit L3, and the potential difference between the first external terminal Ta1 and the second external terminal Ta2 gradually increases. Thereby, the rush current when the lighting is switched from OFF to ON can also be suppressed.

In addition, embodiment is an illustration and the range of invention is not limited to them.

G AC generator 10 Lamp drive power supply 100 LED lamp lighting device Ta1 First external terminal Ta2 Second external terminal L1 First lamp circuit L2 Second lamp circuit L3 Third lamp circuit SW1 First switch circuit SW2 Second switch circuit SW3 Third switch circuit SCR Switch element D Diode C1 Switch control circuit

Claims

Connected between a first power supply terminal on the low potential side and a second power supply terminal on the high potential side of the lamp drive power supply, receives a drive current from the lamp drive power supply, and is connected in series by the drive current. An LED lamp lighting device for lighting a plurality of LED lamps,
A first external terminal connected to the first power supply terminal;
A second external terminal connected to the second power supply terminal;
A first lamp circuit comprising one LED lamp or a plurality of LED lamps connected in series, one end of which is connected to the first external terminal;
A second lamp circuit composed of one LED lamp or a plurality of LED lamps connected in series, one end of which is connected to the other end of the first lamp circuit;
A third lamp having one LED lamp or a plurality of LED lamps connected in series, one end connected to the other end of the second lamp circuit and the other end connected to the second external terminal Circuit,
Between a first reference node and a first contact connected to the first external terminal, or a second reference node and a second contact connected to the other end of the first ramp circuit. A first switch circuit that conducts only one of the contacts of
Between a second reference node connected to the other end of the first ramp circuit and a third contact connected to the first reference node, or between the second reference node and a fourth A second switch circuit that conducts only one of the contacts;
Between the third reference node connected to the first reference node and the fifth contact connected to the second external terminal, between the third reference node and the sixth contact Or a third switch circuit that conducts only one of the third reference node and a seventh contact connected to the other end of the second ramp circuit;
A diode having a cathode connected to the other end of the second ramp circuit and an anode connected to the fourth contact;
A switching element having one end connected to the fourth contact and the other end connected to the second external terminal;
A switch control circuit for controlling the switch element in accordance with a potential difference between the fourth contact and the second external terminal;
The switch control circuit includes:
When the magnitude of the potential difference between the fourth contact and the second external terminal is equal to or higher than a preset reference voltage, the switch element is turned on,
The LED lamp lighting device, wherein the switch element is turned off when the magnitude of the potential difference between the fourth contact and the second external terminal is less than the reference voltage.
In the LED lamp lighting device, the first lamp circuit, the second lamp circuit, and the third lamp circuit are short-circuited between the first external terminal and the second external terminal. The LED lamp lighting device according to claim 1, wherein the lamp circuit is turned off.
2. The LED lamp lighting device according to claim 1, wherein the switch element is a thyristor having a cathode connected to the fourth contact and an anode connected to the second external terminal.
The switch control circuit includes:
A first resistor having one end connected to the fourth contact and the other end connected to the gate of the thyristor;
A second resistor having one end connected to the other end of the first resistor;
The LED lamp lighting device according to claim 3, further comprising: a Zener diode having an anode connected to the other end of the second resistor and a cathode connected to the second external terminal.
The lamp driving power source is
A first input terminal connected to one end of the alternator;
A second input terminal connected to the other end of the AC generator;
A power switch element having one end connected to the first input terminal and the other end connected to the first power terminal;
A capacitor having one end connected to the other end of the power switch element and the other end connected to the second input terminal;
A detection resistor having one end connected to the second input terminal and the other end connected to the second power supply terminal;
When the current flows through the detection resistor, the power switch element is controlled so that the current flowing through the detection resistor is constant. On the other hand, when the current does not flow through the detection resistor, the first resistor The drive control circuit which controls the switch element for power supplies so that the voltage between a power supply terminal and the 2nd power supply terminal may become a regulation voltage set up beforehand. LED lamp lighting device of description.
The lamp driving power source is
It has a constant voltage control function and a constant current control function,
When a current can be supplied to any one of the first lamp circuit, the second lamp circuit, and the third lamp circuit, a constant current is supplied to the LED lamp by the constant current control function. ,
When no current can flow through any of the LED lamps in the first lamp circuit, the second lamp circuit, and the third lamp circuit, the constant voltage control function causes the first power supply terminal to 2. The LED lamp lighting device according to claim 1, wherein an output voltage output between the second power supply terminal is raised to a predetermined voltage set in advance and limited to a constant voltage.
The one end of the first lamp circuit is a cathode side of the LED lamp of the first lamp circuit;
The other end of the first lamp circuit is an anode side of the LED lamp of the first lamp circuit;
The one end of the second lamp circuit is a cathode side of the LED lamp of the second lamp circuit;
The other end of the second lamp circuit is an anode side of the LED lamp of the second lamp circuit;
The one end of the third lamp circuit is a cathode side of the LED lamp of the third lamp circuit;
The LED lamp lighting device according to claim 1, wherein the other end of the third lamp circuit is an anode side of the LED lamp of the third lamp circuit.
The LED lamp according to claim 1, wherein the first switch circuit, the second switch circuit, and the third switch circuit are manually controlled by a user. Lighting device.
The LED lamp of the first lamp circuit is a high beam lamp of a vehicle headlamp,
The LED lamp of the second lamp circuit is a low beam lamp of the headlamp,
2. The LED lamp lighting device according to claim 1, wherein the LED lamp of the third lamp circuit is a position lamp of the vehicle.
Connected between a first power supply terminal on the low potential side and a second power supply terminal on the high potential side of the lamp drive power supply, receives a drive current from the lamp drive power supply, and is connected in series by the drive current. An LED lamp lighting device for lighting a plurality of LED lamps, a first external terminal connected to the first power supply terminal, a second external terminal connected to the second power supply terminal, A first lamp circuit composed of one LED lamp or a plurality of LED lamps connected in series, one end of which is connected to the first external terminal, and one LED lamp or a plurality of LEDs connected in series A second lamp circuit having one end connected to the other end of the first lamp circuit, and one LED lamp or a plurality of LED lamps connected in series, and one end being the second lamp circuit. Lamp circuit Between a third ramp circuit connected to the other end, the other end connected to the second external terminal, a first reference node, and a first contact connected to the first external terminal Or a first switch circuit that conducts only one of the first reference node and a second contact connected to the other end of the first ramp circuit, and the first switch circuit. Between the second reference node connected to the other end of the ramp circuit and the third contact connected to the first reference node, or between the second reference node and the fourth contact A second switch circuit that conducts only one of them, a third reference node connected to the first reference node, and a fifth contact connected to the second external terminal. Or between the third reference node and the sixth contact, or between the third reference node and the second ramp circuit. A third switch circuit that conducts only one of the seventh contact connected to the other end, a cathode connected to the other end of the second ramp circuit, and an anode connected to the fourth contact A switch element having one end connected to the fourth contact and the other end connected to the second external terminal; and between the fourth contact and the second external terminal. A switch control circuit for controlling the switch element in accordance with the potential difference of the LED lamp lighting device comprising:
When the magnitude of the potential difference between the fourth contact and the second external terminal is equal to or higher than a preset reference voltage, the switch element is turned on,
The method for controlling the LED lamp lighting device, wherein the switch element is turned off when the magnitude of the potential difference between the fourth contact and the second external terminal is less than the reference voltage.