JP2012119541A - Power supply system for led lighting device and power supply method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply power to LED lighting devices having different drive systems, rated voltages or rated currents by using one power supply system.SOLUTION: The power supply system for an LED lighting device comprises a variable power supply 2 which applies a variable voltage to a power supply side plus terminal 100a, and a constant current control circuit connected in series with the power supply side plus terminal 100a or a power supply side minus terminal 100b. A determination is made whether a lighting device connected with each terminal of 100a, 100b on the power supply side is a constant voltage drive LED lighting device 200 or a constant current drive LED lighting device 300, and the control method is differentiated according to the type of the connected lighting device.

Description

  The present invention relates to a power supply system and a power supply method for supplying power to different types of LED lighting devices such as a constant voltage method or a constant current method.

  Conventional LED lighting devices having different driving methods such as a constant voltage method or a constant current method are appropriately used according to various applications. Some constant current type LED lighting devices are driven by various rated currents, and some constant voltage type LED lighting devices are driven by various rated voltages.

  For example, a 12V rated voltage or 24V rated voltage LED lighting device (constant voltage method) includes a 12V rated voltage constant voltage power supply (12V power supply) or a 24V rated voltage constant voltage power supply (24V power supply), respectively. Connected and powered by, for example, PWM control.

  In addition to the constant voltage drive system, this LED illumination apparatus includes a constant current system. As shown in Patent Document 1, an identification resistor for identifying a rated current is provided inside the LED illumination apparatus. The power supply device connected to the LED lighting device is configured to determine the rated current of the LED lighting device by applying a voltage to the identification resistor and detecting the flowing current. And the electric current which flows into an LED lighting apparatus is controlled by the constant current control circuit connected in series with the said LED lighting apparatus so that it may become the discriminated rated current.

  Furthermore, as an LED illumination device (constant current method) for spot illumination use, it has one power LED (LED capable of continuously flowing a current of 200 mA or more). A power supply device with variable current at a constant voltage of 5 V is connected, and power is supplied so that a predetermined current flows.

  As described above, it is necessary for the conventional LED lighting device to prepare a dedicated power supply device depending on the difference in driving method and the difference in rated voltage or rated current. Then, it is necessary to prepare a dedicated power supply device when using the LED lighting device according to the application, and it is necessary to pay attention to selection and connection of the corresponding power supply device in order to prevent failure of the LED lighting device and the like. . In addition, since it is necessary to prepare a plurality of power supply devices, not only the cost is increased, but also the storage space is increased, which places a burden on the user.

  In addition, LED lighting devices for spot lighting are connected to a multi-channel 12V power source or 24V power source. Specifically, a separate resistance circuit is interposed between the LED lighting device and the power supply device to reduce the voltage or current so that it becomes the rated voltage or rated current of the LED lighting device. In such a case, there is a problem in that unnecessary heat is generated in the resistance circuit, which has a thermal effect on peripheral devices and the like, or power consumption increases.

  In addition, when connecting an LED lighting device with a rated voltage of 12V to a 24V power supply, or when using a strobe power supply for strobe emission with the current kept within the rated range, it is necessary to connect a separate resistance circuit as described above. There is a problem that unnecessary heat is generated and the peripheral devices are affected by heat, or the power consumption is increased.

  In addition, for example, when the cable connecting the LED lighting device (constant current method) for spot lighting and the power supply device is long, the luminance of light emitted from the LED due to a voltage drop generated in the cable with a constant voltage power supply of 5.5V There is also a problem that decreases.

JP 2004-158840 A

  Accordingly, the present invention has been made to solve the above-mentioned problems all at once, and is mainly intended to enable LED lighting apparatuses having different driving methods, rated voltages, or rated currents to be fed by a single power supply system. It is to be an issue.

  That is, the power supply system for an LED lighting device according to the present invention should be energized with a predetermined rated current, and is provided with a constant current drive type LED lighting provided with an identification resistor for identifying the rated current, or a predetermined rated voltage Connected to the power supply side positive terminal to which the constant voltage drive type LED lighting to be energized is connected, the illumination side positive terminal is connected, the power supply side negative terminal to which the illumination side negative terminal is connected, and the negative terminal of the identification resistor A variable power supply unit for applying a variable voltage to the power supply side positive terminal, a constant current control circuit unit connected in series to the power supply side positive terminal or the power supply side negative terminal, and a power supply side Whether the lighting connected to each terminal is a constant voltage driving type LED lighting or a constant current driving type LED lighting, a power source side positive terminal and sensing When the lighting system connected to each terminal on the power source side is a constant current drive type LED illumination, the constant current drive type LED illumination And a constant current drive control unit that discriminates a rated current based on a resistance value of the identification resistor given to the voltage and gradually increases a voltage applied to the plus terminal so as to obtain the rated current.

  If it is such, while being able to discriminate | determine the drive system of LED illumination by the drive system discrimination | determination part, and it is discriminate | determined as constant current drive type LED illumination, the constant current drive type LED illumination of the constant current drive type LED illumination will be carried out. The rated current can be determined. The constant current drive control unit can supply power to a plurality of constant current drive type LED lights having different rated currents by one power supply system by applying a voltage so as to obtain the obtained rated current. Thereby, the problem of the unnecessary heat generation which has arisen by the conventional resistance box can be solved preferably. Furthermore, the constant current drive control unit gradually increases the voltage applied to the positive terminal so that the current flowing through the constant current drive LED lighting is the rated current, thereby allowing the constant current drive LED lighting and the power supply system to The rated current can be passed through the constant current drive type LED lighting without being affected by the voltage drop caused by the intervening cable. Thereby, the brightness fall of constant current drive type LED illumination can be prevented.

  Various constant current drive type LED lightings are connected to the power supply system. In order to prevent each constant current drive type LED lighting from being damaged, the rated current discrimination unit has a resistance value of an identification resistor. It is desirable to perform overcurrent detection using the rated current determined by.

  Further, the power supply system for an LED lighting device according to the present invention should be energized with a predetermined rated current and provided with an identification resistor for identifying the rated current, or with a predetermined rated voltage. Connected to the power supply side positive terminal to which the constant voltage drive type LED lighting to be energized is connected, the illumination side positive terminal is connected, the power supply side negative terminal to which the illumination side negative terminal is connected, and the negative terminal of the identification resistor A variable power supply unit for applying a variable voltage to the power supply side positive terminal, a constant current control circuit unit connected in series to the power supply side positive terminal or the power supply side negative terminal, and a power supply side Whether the illumination connected to each terminal is a constant voltage drive type LED illumination or a constant current drive type LED illumination, whether the power supply side plus terminal and the sensing terminal When the lighting connected to each terminal on the power source side is a constant voltage driving type LED lighting, the constant current control circuit unit A constant voltage drive control unit that determines a rated voltage of the constant voltage drive type LED illumination by flowing a predetermined current through the voltage drive type LED illumination and detecting a voltage at a minus terminal of the constant voltage drive type LED illumination;

  If it is such, while being able to discriminate | determine the drive system of LED illumination by the drive system discrimination | determination part, and it is discriminate | determined as constant current drive type LED illumination, the constant current drive type LED illumination of the constant current drive type LED illumination will be carried out. The rated current can be determined. The constant current drive control unit can supply power to a plurality of constant current drive type LED lights having different rated currents by one power supply system by applying a voltage so as to obtain the obtained rated current. Thereby, the problem of the unnecessary heat generation which has arisen by the conventional resistance box can be solved preferably. Furthermore, the constant current drive control unit gradually increases the voltage applied to the positive terminal so that the current flowing through the constant current drive LED lighting is the rated current, thereby allowing the constant current drive LED lighting and the power supply system to The rated current can be passed through the constant current drive type LED lighting without being affected by the voltage drop caused by the intervening cable. Thereby, the brightness fall of constant current drive type LED illumination can be prevented.

  If it is such, while the drive system discrimination | determination part can discriminate | determine the drive system of LED lighting, and when it is discriminate | determined as constant voltage drive type LED illumination, the constant voltage drive type | mold illumination part of constant voltage drive type LED illumination will be determined. The rated voltage can be determined. Further, the constant voltage drive control unit can supply power to a plurality of constant voltage drive type LED lights having different rated voltages by one power supply system by applying the obtained rated voltage to the constant voltage drive type LED lighting. it can. Thereby, the problem of the unnecessary heat generation which has arisen by the conventional resistance box can be solved preferably.

  In order to accurately and easily determine the rated voltage of the constant voltage drive type LED lighting by the constant voltage drive control unit, the characteristic data storing the characteristic data indicating the current voltage characteristics of each of the plural types of constant voltage drive type LED lighting The constant voltage drive control unit applies a predetermined voltage to the plus terminal of the constant voltage drive type LED lighting, and causes the constant current control circuit unit to pass a predetermined constant current, The rated voltage of the connected constant voltage driving type LED lighting may be determined from the differential voltage between the positive terminal voltage and the negative terminal voltage of the constant voltage driving type LED lighting and the current voltage characteristic indicated by the characteristic data. desirable. In addition, when the type of the constant voltage drive type LED illumination to be connected is specified, the negative terminal of the constant voltage drive type LED illumination when a predetermined constant current is passed by the constant current control circuit unit The rated voltage of the constant voltage drive type LED illumination to be connected can be determined based on the magnitude relationship of the voltages.

  Various constant voltage drive type LED lightings are connected to the power supply system. In order to prevent each constant voltage drive type LED lighting from being damaged, the constant voltage drive control unit has determined the rated voltage. It is desirable to perform overcurrent detection using the rated current flowing in the constant voltage drive type LED lighting by applying.

  The power supply system for an LED lighting device according to the present invention should be energized with a predetermined rated current, and is a constant current drive type LED illumination provided with an identification resistor for identifying the rated current, or with a predetermined rated voltage. Sensing to which a constant voltage drive type LED illumination to be energized is connected, a power source side positive terminal to which the illumination side positive terminal is connected, a power source side negative terminal to which the illumination side negative terminal is connected, and a negative terminal of the identification resistor are connected A variable power supply unit that has a terminal and applies a variable voltage to the power supply side positive terminal, a constant current control circuit unit connected in series to the power supply side positive terminal or the power supply side negative terminal, and connected to each terminal on the power supply side Whether the applied illumination is constant voltage drive type LED illumination or constant current drive type LED illumination is applied between the power supply side positive terminal and the sensing terminal. A drive method determining unit that determines using a current value that flows according to a voltage; a drive control unit that performs control according to the type of illumination connected to each terminal on the power source side based on the result obtained by the drive method determining unit; It is characterized by providing.

  Furthermore, the power supply method for an LED lighting device according to the present invention should be energized at a predetermined rated current, and is a constant current drive type LED illumination provided with an identification resistor for identifying the rated current, or a predetermined rating Constant voltage drive type LED lighting to be energized by voltage is connected, the power source side positive terminal to which the illumination side positive terminal is connected, the power source side negative terminal to which the illumination side negative terminal is connected, and the negative terminal of the identification resistor are connected A variable power supply unit for applying a variable voltage to the power supply side positive terminal, and a constant current control circuit unit connected in series to the power supply side positive terminal or the power supply side negative terminal. A power supply method for an LED illumination device using the LED illumination device power supply system, wherein the illumination connected to each terminal on the power source side is a constant voltage drive type LED illumination. Or a constant current drive type LED lighting, using a current flowing by a predetermined voltage applied between the power supply side positive terminal and the sensing terminal, a driving method determination step, and connection to each terminal on the power supply side When the illuminated light is a constant current drive type LED illumination, the rated current is determined based on the resistance value of the identification resistor applied to the constant current drive type LED illumination, and applied to the plus terminal so as to be the rated current. And a constant current drive control step of gradually increasing the voltage.

  The power supply method for an LED lighting device according to the present invention should be energized with a predetermined rated current, and is a constant current drive type LED illumination provided with an identification resistor for identifying the rated current, or a predetermined rating Constant voltage drive type LED lighting to be energized by voltage is connected, the power source side positive terminal to which the illumination side positive terminal is connected, the power source side negative terminal to which the illumination side negative terminal is connected, and the negative terminal of the identification resistor are connected A variable power supply unit for applying a variable voltage to the power supply side positive terminal, and a constant current control circuit unit connected in series to the power supply side positive terminal or the power supply side negative terminal. A power supply method for an LED lighting device using a power system for the LED lighting device, wherein the lighting connected to each terminal on the power source side is a constant voltage drive type LED lighting A driving method discrimination step for discriminating whether there is a constant current drive type LED lighting or not using a current flowing by a predetermined voltage applied between the power source side positive terminal and the sensing terminal, and connected to each terminal on the power source side When the illumination is constant voltage drive type LED illumination, the constant current control circuit unit applies a predetermined current to the constant voltage drive type LED illumination and detects the voltage at the negative terminal of the constant current drive type LED illumination. And a constant voltage drive control step of determining a rated voltage of the constant voltage drive type LED illumination.

  In addition, a constant voltage drive type LED lighting to be energized at a predetermined rated voltage according to the present invention is connected, and a power source side positive terminal to which an illumination side positive terminal is connected and a power source side negative terminal to which an illumination side negative terminal is connected are provided. A variable power supply unit for applying a variable voltage to the power supply side positive terminal, a constant current control circuit unit connected in series to the power supply side positive terminal or the power supply side negative terminal, and the constant current control circuit unit A constant voltage drive control unit that determines a rated voltage of the constant voltage drive type LED illumination by flowing a predetermined current through the constant voltage drive type LED illumination and detecting a voltage at a minus terminal of the constant voltage drive type LED illumination; A characteristic data storage unit that stores characteristic data indicating current-voltage characteristics of each of a plurality of types of constant current drive type LED lighting, and the constant voltage drive control unit includes the constant voltage drive control unit. When a predetermined voltage is applied to the positive terminal of the pressure-driven LED lighting and a predetermined constant current is caused to flow by the constant current control circuit unit, the positive terminal voltage and the negative terminal voltage of the constant-voltage driving LED lighting The rated voltage of the connected constant voltage drive type LED lighting is determined from the differential voltage and the current-voltage characteristic indicated by the characteristic data. In this case, the constant voltage drive control unit can determine the rated voltage of the constant voltage drive type LED illumination. Further, the constant voltage drive control unit can supply power to a plurality of constant voltage drive type LED lights having different rated voltages by one power supply system by applying the obtained rated voltage to the constant voltage drive type LED lighting. it can. Thereby, the problem of the unnecessary heat generation which has arisen by the conventional resistance box can be solved preferably. In addition, by using the characteristic data indicating the current-voltage characteristics of each of the plurality of types of constant current drive type LED lighting, it is possible to accurately and easily determine the rated voltage of the constant voltage drive type LED lighting by the constant voltage drive control unit. it can.

  According to the present invention configured as described above, LED lighting devices having different driving methods, rated voltages, or rated currents can be fed by a single power supply system.

The schematic diagram which shows the structure of the power source system for LED light source devices which concerns on one Embodiment of this invention. The figure which shows the specific function structure of the control apparatus of the embodiment. The schematic diagram of the current-voltage characteristic which the characteristic data of the embodiment shows. The flowchart which shows operation | movement of the power supply system for LED lighting apparatuses of the embodiment.

  Hereinafter, an embodiment of a power supply system 100 for an LED lighting device according to the present invention will be described with reference to the drawings.

<Device configuration>
The power supply system 100 for an LED lighting device according to this embodiment includes an LED lighting device having a constant voltage driving type LED lighting 200 driven by a constant voltage method or a constant current driving type LED lighting 300 driven by a constant current method. It is a power supply device to which the LED lighting device is connected.

  Specifically, as shown in FIG. 1, a power source side positive terminal 100a to which a constant voltage driving type LED lighting 200 or a constant current driving type LED lighting 300 is connected and a circuit side positive terminal is connected, as shown in FIG. The power supply side negative terminal 100b to which the terminal is connected and the sensing terminal 100c to which the negative terminal of the identification resistor is connected.

  As shown in FIG. 1A, the constant voltage drive type LED lighting 200 is to be energized with a predetermined rated voltage (for example, 12V or 24V), and is connected to the power source side positive terminal 100a. 200a and a circuit side minus terminal 200b connected to the power source side minus terminal 100b, and one or a plurality of LED light emitting units 200d, in which a plurality of LEDs are connected in series, are connected in parallel to the plus terminal 200a and the minus terminal 200b. It is configured. Since the LED illumination 200 is a constant voltage drive type, a current limiting resistor 200r is connected to each LED light emitting unit 200d in series with the LED. Further, the constant voltage drive type LED lighting 200 is provided with a dummy terminal 200 c connected to the sensing terminal 100 c of the power supply system 100. The dummy terminal 200c is electrically separated from the plus terminal 200a. Note that the dummy terminal 200c may be omitted.

  As shown in FIGS. 1B and 1C, the constant current drive type LED lighting 300 is to be energized with a predetermined rated current, and the circuit side plus terminal 300a connected to the power source side plus terminal 100a. And a circuit side minus terminal 300b connected to the power source side minus terminal 100b, and a plurality of LED light emitting units 300d formed by connecting one LED or a plurality of LEDs in series are connected in parallel between the plus terminal 300a and the minus terminal 300b. Has been configured. In addition, since this LED lighting 300 is a constant current drive type, there is no need to provide a current limiting resistor in each LED light emitting unit 300d.

  In addition, the constant current drive type LED lighting 300 includes an identification resistor 300e for identifying a model having a resistance value corresponding to the standard or usage characteristics of the LED lighting 300. The identification resistor 300e of this embodiment is for identifying a rated current that is the maximum allowable current of the dimming upper limit (maximum light output level) of the constant current drive type LED lighting 300, and is a positive terminal of the identification resistor 300e. Is connected to the positive terminal side of the LED light emitting unit 300d, and the negative terminal 300c of the identification resistor 300e is connected to the power supply side sensing terminal 100c. Thereby, the circuit formed by the plus terminal 300a and the minus terminal 300b forms a circuit network independent of the LED light emitting unit 300d.

  In FIG. 1, the constant current drive type LED lighting 300 is configured by connecting an LED light emitting unit 300d in which a plurality of LEDs are connected in series to a positive terminal 300a and a negative terminal 300b in parallel (FIG. 1B). LED light emitting unit 300d composed of one power LED (LED capable of continuously flowing a current of 200 mA or more) and connected to the plus terminal 300a and the minus terminal 300b (see FIG. 1C) However, it is not limited to this.

  Thus, the power supply system 100 includes a variable power supply unit 2 for applying a variable voltage to the power supply side positive terminal 100a, and a constant current / PWM control circuit connected in series to the power supply side positive terminal 100a or the power supply side negative terminal 100b. And a control device 4 that controls the variable power supply unit 2 and the constant current / PWM control circuit unit 3.

The variable power source unit 2 is, for example, a transformer circuit (DCDC converter) 21 that transforms a voltage (V _in ) from an AC power source capable of supplying a voltage of DC 48 V or higher, and a DC voltage obtained by rectifying and smoothing the AC voltage from the transformer circuit 21. and _{(V out +)} rectifying and smoothing circuit 22 for outputting, and a voltage dividing circuit (voltage detection circuit) 23 for detecting an output voltage _{(V out +)} applied to the power supply side positive terminal 100a. The transformer circuit (DCDC converter) 21 adjusts the voltage (V _in ) from the AC power source to a predetermined voltage based on a voltage command value from the control device 4 described later. The output terminal of the rectifying / smoothing circuit 22 is connected to the power supply side positive terminal 100a.

  The constant current / PWM control circuit unit 3 is configured by using an operational amplifier and an FET, and an output end thereof is connected to the cathode side of the LED through a power source side negative terminal 100b.

  The constant current / PWM control circuit unit 3 controls a current flowing through the LED lightings 200 and 300 or a voltage applied to the constant voltage drive type LED lighting 200 based on a current command value from the control device 4 to be described later. Although the details will be described later, the constant current / PWM control circuit unit 3 exhibits both a function as a constant current control circuit and a function as a PWM control circuit when the constant voltage drive type LED lighting 200 is connected. When the constant current drive type LED lighting 300 is connected, it functions as a constant current control circuit.

  The constant current / PWM control circuit unit 3 adjusts the current flowing through the LED lightings 200 and 300 connected to the terminals 100a to 100c of the power supply system 100 to a predetermined value. For example, the constant current / PWM control circuit unit 3 uses the dimming signal set by the dimming setting unit 5 when the constant current drive type LED lighting 300 is connected to each terminal 100 a to 100 c of the power supply system 100. A control current having a proportional strength is supplied to the constant current drive type LED lighting 300.

  On the other hand, the constant current / PWM control circuit unit 3 outputs the dimming signal set by the dimming setting unit 5 when the constant voltage drive type LED lighting 200 is connected to the terminals 100a to 100c of the power supply system 100. Based on this, the voltage applied to the LED constant voltage circuit 200 is subjected to PWM control in order to adjust the light amount of the constant voltage drive type LED lighting 200.

  The control device 4 determines the driving method of the LED lightings 200 and 300 to which the terminals 100a to 100c on the power supply side are connected, and sets the LED lightings 200 and 300 in accordance with the driving method of the connected LED lightings 200 and 300. For example, a dedicated or general-purpose computer including a CPU, a memory, an input / output interface, and the like.

  Then, a predetermined program is installed in the memory, and the CPU and peripheral devices cooperate with each other based on the program. As a result, as shown in FIG. 2, the drive method determination unit 41, the characteristic data storage unit D1, the constant voltage drive It functions as the control unit 42, the constant current drive control unit 43, and the like.

Hereinafter, each part 41-43 and D1 are demonstrated.
The drive method discriminating unit 41 discriminates the drive method of the LED lightings 200 and 300 connected to the terminals 100a to 100c on the power source side, applies a predetermined voltage to the power source side positive terminal 100a and the sensing terminal 100c, The current flowing through the sensing terminal 100c is detected, and it is determined whether it is the constant voltage drive type LED lighting 200 or the constant current drive type LED lighting 300.

  Specifically, the driving method determination unit 41 controls the transformer circuit 21 so as to apply a predetermined voltage between the power supply side positive terminal 100a and the sensing terminal 100c, and the current flowing through the sensing terminal 100c when the predetermined voltage is applied. To detect. If the current is zero, it is determined that the dummy terminal 200c of the constant voltage driving type LED lighting 200 is connected to the sensing terminal 100c, and the LED lighting connected to the power supply system 100 is the constant voltage driving type LED. The lighting 200 is determined. On the other hand, if a current flows through the sensing terminal 100c, it is determined that the negative terminal 300c of the identification resistor 300e is connected to the sensing terminal 100c, and the LED illumination connected to the power supply system 100 is the constant current drive type LED illumination. Judged to be 300.

When the LED lighting connected to the power supply system 100 is determined to be the constant voltage driving type LED lighting 200, the constant voltage driving control unit 42 determines the rated voltage of the constant voltage driving type LED lighting 200, and The variable power supply unit 2 is controlled so that the rated voltage is applied to the drive type LED lighting 200. The constant voltage drive control unit 42 acquires the measured value of the voltage (V _in ) output from the AC power supply and the measured value of the voltage dividing circuit 23, and increases or decreases the voltage value (V _in ). A voltage command value is output to the transformer circuit 21.

Specifically, the constant voltage drive control unit 42 outputs a predetermined current command value to the constant current control circuit unit 3 to flow a predetermined current through the constant voltage drive type LED lighting 200, and the negative terminal of the constant voltage drive type LED lighting 200. By detecting the voltage (V _out− ) of 200b, the rated voltage of the constant voltage drive type LED lighting 200 is determined.

Specifically, the constant voltage drive control unit 42 outputs a voltage command value to the transformer circuit 21 and applies a predetermined voltage (for example, 24 V or the like) to the plus terminal 200 a of the constant voltage drive type LED lighting 200. The constant voltage drive control unit 42 outputs a current command value to the constant current control circuit unit 3 so that a predetermined constant current (10 mA (current command value)) flows through the constant voltage drive type LED lighting 200. . Then, the constant voltage drive control unit 42 calculates a differential voltage (V _f ) between the plus terminal voltage (V _{out +} ) and the minus terminal voltage (V _out− ) of the constant voltage drive type LED lighting 200. Further, the constant voltage drive control unit 42 acquires the characteristic data from the characteristic data storage unit D1, and from the current voltage characteristic indicated by the data, the differential voltage (V _f ), and the current flowing through the constant voltage drive type LED lighting 200, The rated voltage of the connected constant voltage drive type LED lighting 200 is determined.

The characteristic data storage unit D1 stores characteristic data indicating the current-voltage characteristics of each of a plurality of types of constant current drive type LED lighting 200. As shown in FIG. 3, the current-voltage characteristic is data indicating that the energization start voltage (V _fmin ) varies depending on the constant voltage drive type LED lighting 200 in which the rated voltage is determined. In the current-voltage characteristics, the energization start voltage (V _fmin ) varies depending on the number of LEDs in series, and the slope varies depending on the number of parallel connection circuits and the presence or absence of a current limiting resistor.

  When the LED lighting connected to the power supply system 100 is determined to be the constant current driving LED lighting 300, the constant current driving control unit 43 controls the dimming upper limit value (maximum light output level) of the constant current driving LED lighting 300. ) Is detected, and the variable power supply unit 2 is controlled so that the rated current flows through the constant current drive type LED lighting 300.

  Specifically, the constant current drive control unit 43 detects a current flowing through the sensing terminal 100c when a predetermined voltage is applied between the power supply side positive terminal 100a and the sensing terminal 100c by the drive method determination unit 41, thereby providing a constant current. The resistance value of the identification resistor 300e applied to the drive type LED illumination 300 is calculated. Then, the rated current of the LED constant current circuit 300 is determined based on the resistance value. The correspondence data between the resistance value of the identification resistor 300e and the rated current is stored in the memory of the control device 4 in advance.

Further, the constant current drive control unit 43 sets the voltage command value to be output to the transformer circuit 21 so as to gradually increase the voltage (V _{out +} ) applied to the circuit-side plus terminal 300a so that the determined rated current is obtained. The transformer circuit 21 is controlled by changing gradually.

Specifically, the constant current drive control unit 43 acquires the detected current obtained from the constant current control circuit unit 3 and compares it with the determined rated current, so that the detected current becomes the rated current. The voltage (V _{out +} ) applied to the constant current drive type LED lighting 300 is increased step by step.

  The power supply system 100 is provided with a control mode setting unit 6, and a control mode (for example, a constant voltage PWM control mode) of the constant voltage drive type LED lighting 200 or the constant current drive type LED lighting 300 by a user's external operation. , Strobe light emission control mode, etc.) can be selected.

  Next, the operation of the power supply system 100 according to the present embodiment will be described with reference to the flowchart of FIG.

  After connecting a desired LED lighting device (constant voltage driving LED lighting 200 or constant current driving LED lighting 300) to the power supply system 100, the power is turned on. The power supply system 100 is configured to be switchable between a sensing ON setting that exhibits a sensing function for determining a driving method and a sensing OFF setting that does not exhibit a sensing function. Hereinafter, a case where the sensing ON setting is set will be described.

  The power supply system 100 performs sensing within a predetermined time (for example, several seconds) immediately after the power is turned on. First, the drive method determination unit 41 outputs a predetermined voltage command value to the transformer circuit 21 of the variable power supply unit 2, applies a predetermined constant voltage (for example, 5V) to the power supply side positive terminal 100a, and performs sensing. The current flowing through the terminal 100c is detected (step S1). Accordingly, when a current flows through the sensing terminal 100c, the drive method determination unit 41 determines that the constant current drive type LED lighting 300 is connected to the terminals 100a to 100c on the power supply side. On the other hand, when no current flows through the sensing terminal 100c, the drive method determination unit 41 determines that the constant voltage drive type LED lighting 200 is connected to each of the terminals 100a to 100c on the power supply side (step S2).

When it is determined that the constant voltage drive type LED lighting 200 is connected to each of the terminals 100 a to 100 c on the power supply side, the drive method determination unit 41 outputs the determination signal to the constant voltage drive control unit 42. The constant voltage drive control unit 42 that has received this determination signal outputs a predetermined voltage command value to the transformer circuit 21, and applies a predetermined constant voltage (for example, 24V) to the power supply side positive terminal 100a (circuit side positive terminal 200a). In addition, a predetermined current (for example, 10 mA) is output as a current command value to the constant current / PWM control circuit unit 3. Then, the constant voltage control circuit unit 42 controls the current flowing through the constant voltage drive type LED lighting 200 based on the current command value. At this time, the constant voltage drive control unit 42 detects the voltage (V _out− ) of the minus terminal 200b (power source side minus terminal 100b) of the constant current drive type LED lighting 200, and is applied to the power source side plus terminal 100a. calculating a voltage _{(V out +)} differential voltage between the _(V out _{+ -V out-)} which have, for the differential voltage between specific forward voltage of the constant voltage drive type LED lighting 200 _{(V f)} (step S3). If no current flows through the constant voltage drive LED lighting 200 at this time, it is determined that the constant voltage drive LED lighting 200 is not connected (step S4), and the process returns to step S1.

Further, the constant voltage drive control unit 42 acquires the characteristic data from the characteristic data storage unit D1, and the relationship between the current voltage characteristics indicated by the characteristic data, the calculated forward voltage (V _f ), and the constant voltage drive type LED illumination. The rated voltage (12 V or 24 V in the present embodiment) of the constant voltage drive type LED lighting 200 is determined from the current flowing through 200 (step S5). At this time, if it is determined that the rated voltage is not 12V or 24V, it is determined that the connected LED lighting device is not rated, and the process returns to step S1 after error processing.

  When the constant voltage drive control unit 42 determines in step S5 that the rated voltage of the constant voltage drive type LED lighting 200 is 12V or 24V, the determined rated voltage is supplied to the power source side positive terminal 100a (circuit side). A voltage command value indicating the rated voltage is output to the transformer circuit 21 so as to be applied to the plus terminal 200a) (step S6). Thereby, a desired rated voltage is applied to the constant voltage drive type LED lighting 200. In addition, after completion of sensing, the constant voltage drive control unit 42 performs dimming control using the constant current / PWM control circuit unit 3 in accordance with the dimming signal acquired from the dimming setting unit 5.

  Furthermore, the constant voltage drive control unit 42 detects the rated current flowing through the constant voltage drive type LED lighting 200 at the dimming upper limit value (maximum light output level) by applying the determined rated voltage, and calculates the rated current. A reference value for overcurrent detection is stored in a predetermined area of the memory (step S7), and subsequent overcurrent detection is also performed. In addition, when an overcurrent occurs in the constant voltage drive type LED lighting 200 in the overcurrent detection, the circuit is cut off to the constant voltage drive type LED lighting 200 in order to prevent failure of the constant voltage drive type LED lighting 200. Stop power supply.

  On the other hand, when it is determined that the constant current drive type LED lighting 300 is connected to each of the terminals 100 a to 100 c on the power source side, the drive method determination unit 41 outputs the determination signal to the constant current drive control unit 43. The constant current drive control unit 43 that has received this determination signal calculates the resistance value of the identification resistor 300e from the current flowing through the sensing terminal 100c and the voltage between the plus terminal 100a and the sensing terminal 100c, and the constant current drive type is calculated from the resistance value. The rated current of the LED lighting 300 is determined (step S8). Then, by outputting a voltage command value to the transformer circuit 21 so that the current of the minus terminal 300b (power source side minus terminal 100b) of the constant current drive type LED lighting 300 becomes the determined rated current, the power source side plus terminal The voltage of 100a is increased stepwise. At this time, the FET of the constant current / PWM control circuit unit 3 is in the ON state. The applied voltage when the current flowing through the constant current drive type LED lighting 300 becomes the rated current is set as a control voltage in the subsequent lighting (step S9). In addition, after the end of sensing, the constant current drive control unit 43 outputs a current command value to the constant current / PWM control circuit unit 3 in accordance with the dimming signal acquired from the dimming setting unit 5, and this current command value is output. The acquired constant current / PWM control circuit unit 3 controls the current flowing through the constant current drive type LED lighting 300 in accordance with the current command value.

  Further, the constant current drive control unit 43 stores the rated current determined by the resistance value of the identification resistor 300e as a reference value for performing overcurrent detection in a predetermined area of the memory (step S10), and the subsequent overcurrent detection is also performed. Do. In addition, when an overcurrent occurs in the constant current drive type LED lighting 300 in the overcurrent detection, the circuit is cut off to the constant current drive type LED lighting 300 in order to prevent a failure of the constant current drive type LED lighting 300. Stop power supply.

<Effect of this embodiment>
According to the LED lighting apparatus power supply system 100 according to the present embodiment configured as described above, the driving method discriminating unit 41 can discriminate the driving method of the LED lightings 200 and 300, and is discriminated as the constant voltage driving type LED lighting 200. In this case, the rated voltage of the constant voltage drive type LED lighting 200 can be determined by the constant voltage drive control unit 42, and when it is determined as the constant current drive type LED lighting 300, the constant current drive control unit 43. Thus, the rated current of the constant current drive type LED lighting 300 can be determined.

  Further, the constant voltage drive control unit 42 applies the obtained rated voltage to the constant voltage drive type LED lighting 200, and the constant current drive control unit 43 drives the voltage at a constant current so as to obtain the obtained rated current. By applying the type LED lighting 300, a single power supply system 100 can supply power to the plurality of constant voltage driving type LED lightings 200 having different rated voltages and the plurality of constant current driving type LED lightings 300 having different rated currents. . Thereby, the problem of the unnecessary heat generation and the loss of power consumption which have been caused by the conventional resistance box can be preferably solved.

  Furthermore, the constant current drive control unit 43 gradually increases the voltage applied to the positive terminal 300a so that the current flowing through the constant current drive LED lighting 300 is a rated current, The rated current can be passed through the constant current drive type LED lighting 300 without being affected by a voltage drop caused by a cable interposed between the power supply system 100 and the power supply system 100. Thereby, the brightness | luminance fall of the constant current drive type LED lighting 300 can be prevented.

<Other modified embodiments>
The present invention is not limited to the above embodiment.

For example, the power supply system of the embodiment has a characteristic data storage unit, and determines the rated voltage of each constant voltage drive type LED illumination based on the current-voltage characteristic indicated by the characteristic data and the forward voltage (V _f ). However, the power supply system may not have the characteristic data storage unit. For example, in the case of a model determined in advance such as a 12V rating or a 24 rating of constant voltage drive type LED lighting that can be connected to the power supply system, the connection is made depending on the magnitude of the voltage (V _out− ) of the power source negative terminal. You may comprise so that the rated voltage of the made constant voltage drive type LED illumination may be discriminate | determined.

  In the above embodiment, the constant voltage drive type LED lighting 200 has been described for two types of rated voltages of 12V and 24V. However, the constant voltage drive type LED lighting 200 can also be applied to constant voltage drive type LED lighting having other rated voltages. In this case, characteristic data indicating current-voltage characteristics of the constant voltage drive type LED lighting is stored in the characteristic data storage unit.

  In the above embodiment, the constant current control circuit and the PWM control circuit are realized by the constant current / PWM control circuit unit, but they may be configured by different circuits.

  Furthermore, the identification resistor provided in the constant current drive type LED illumination may be a variable resistor. By configuring in this way, it is possible to correct variations in luminance of the constant current drive type LED illumination.

  Moreover, even if the LED lighting device is not scheduled to be connected to the power supply system of the embodiment, the power supply system of the embodiment can be changed by connecting an external resistor having an identification resistor such as a variable resistor. Can be applied.

  In addition, it goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Power supply system 100a for LED lighting apparatus ... Power source side positive terminal 100b ... Power source side negative terminal 100c ... Sensing terminal 200 ... Constant voltage drive type LED lighting 300 ... Constant current drive type LED illumination 300e ... identification resistors 200a, 300a ... circuit side plus terminals 200b, 300b ... circuit side minus terminal 2 ... variable power supply part 3 ... constant current / PWM control circuit part 41 ... Drive method discriminating unit 42 ... constant voltage drive control unit 43 ... constant current drive control unit D1 ... characteristic data storage unit

Claims (9)

A constant current drive type LED illumination that is to be energized with a predetermined rated current and provided with an identification resistor for identifying the rated current or a constant voltage drive type LED illumination to be energized with a predetermined rated voltage is connected. A power supply side positive terminal to which the illumination side positive terminal is connected, a power supply side negative terminal to which the illumination side negative terminal is connected, and a sensing terminal to which the negative terminal of the identification resistor is connected,
A variable power supply unit for applying a variable voltage to the power supply side positive terminal;
A constant current control circuit unit connected in series to the power supply side positive terminal or the power supply side negative terminal;
Whether the illumination connected to each terminal on the power supply side is constant voltage drive type LED illumination or constant current drive type LED illumination, a current flowing by a predetermined voltage applied between the power supply side positive terminal and the sensing terminal is determined. A driving method discriminating unit for discriminating using,
When the illumination connected to each terminal on the power source side is a constant current drive type LED illumination, the rated current is discriminated based on the resistance value of the identification resistor applied to the constant current drive type LED illumination so that the rated current is obtained. And a constant current drive control unit that gradually increases the voltage applied to the plus terminal.   The power supply system for an LED lighting device according to claim 1, wherein the constant current drive control unit performs overcurrent detection using a rated current determined by a resistance value of an identification resistor. Constant current drive type LED lighting to be energized with a predetermined rated current, or constant voltage drive type LED lighting to be energized with a predetermined rated voltage, and a power supply side positive terminal to which an illumination side positive terminal is connected, an illumination side A power source side negative terminal to which the negative terminal is connected, and a sensing terminal to which the negative terminal of the identification resistor is connected;
A variable power supply unit for applying a variable voltage to the power supply side positive terminal;
A constant current control circuit unit connected in series to the power supply side positive terminal or the power supply side negative terminal;
Whether the illumination connected to each terminal on the power supply side is constant voltage drive type LED illumination or constant current drive type LED illumination, a current flowing by a predetermined voltage applied between the power supply side positive terminal and the sensing terminal is determined. A driving method discriminating unit for discriminating using,
When the illumination connected to each terminal on the power source side is a constant voltage drive type LED illumination, a predetermined current is passed through the constant voltage drive type LED illumination by the constant current control circuit unit, and the minus of the constant voltage drive type LED illumination is obtained. A power supply system for an LED lighting device, comprising: a constant voltage drive control unit that determines a rated voltage of the constant voltage drive type LED lighting by detecting a voltage at a terminal. A characteristic data storage unit that stores characteristic data indicating current-voltage characteristics of each of the plurality of types of constant current drive type LED lightings
The constant voltage drive type LED when the constant voltage drive control unit applies a predetermined voltage to the plus terminal of the constant voltage drive type LED illumination and causes the constant current control circuit unit to pass a predetermined constant current. 4. The LED illumination according to claim 3, wherein the rated voltage of the connected constant voltage drive type LED illumination is discriminated from the differential voltage between the plus terminal voltage and the minus terminal voltage of the illumination and the current-voltage characteristics indicated by the characteristic data. Power supply system for equipment.   5. The power supply system for an LED lighting device according to claim 3, wherein the constant voltage drive control unit performs overcurrent detection using a rated current flowing in the constant current drive type LED lighting by applying the determined rated voltage. A constant current drive type LED illumination that is to be energized with a predetermined rated current and provided with an identification resistor for identifying the rated current, or a constant voltage drive type LED illumination to be energized with a predetermined rated voltage is connected, A power supply side positive terminal to which the illumination side positive terminal is connected, a power supply side negative terminal to which the illumination side negative terminal is connected, and a sensing terminal to which the negative terminal of the identification resistor is connected,
A variable power supply unit for applying a variable voltage to the power supply side positive terminal;
A constant current control circuit unit connected in series to the power supply side positive terminal or the power supply side negative terminal;
Whether the illumination connected to each terminal on the power supply side is constant voltage drive type LED illumination or constant current drive type LED illumination, the current value that flows by a predetermined voltage applied between the power supply side positive terminal and the sensing terminal A driving method discriminating unit for discriminating using
A power supply system for an LED lighting device, comprising: a drive control unit that performs control according to the type of illumination connected to each terminal on the power source side based on a result obtained by the drive method determination unit. Connected to a constant current drive type LED illumination that should be energized with a predetermined rated current and provided with an identification resistor for identifying the rated current, or a constant voltage drive type LED illumination to be energized with a predetermined rated voltage A power supply side positive terminal to which the illumination side positive terminal is connected, a power supply side negative terminal to which the illumination side negative terminal is connected, and a sensing terminal to which the negative terminal of the identification resistor is connected,
A power supply system for an LED lighting device comprising a variable power supply unit for applying a variable voltage to the power supply side positive terminal and a constant current control circuit unit connected in series to the power supply side positive terminal or the power supply side negative terminal was used. A power supply method for an LED lighting device,
Whether the illumination connected to each terminal on the power supply side is constant voltage drive type LED illumination or constant current drive type LED illumination, a current flowing by a predetermined voltage applied between the power supply side positive terminal and the sensing terminal is determined. A driving method determining step to determine using,
When the illumination connected to each terminal on the power source side is a constant current drive type LED illumination, the rated current is discriminated based on the resistance value of the identification resistor applied to the constant current drive type LED illumination so that the rated current is obtained. And a constant current drive control step of gradually increasing the voltage applied to the plus terminal. A constant current drive type LED lighting to be energized with a predetermined rated current or a constant voltage drive type LED illumination to be energized with a predetermined rated voltage is connected, and a power source side positive terminal to which an illumination side positive terminal is connected, an illumination side negative A power source side negative terminal to which the terminal is connected and a sensing terminal to which the negative terminal of the identification resistor is connected;
A power supply system for an LED lighting device comprising a variable power supply unit for applying a variable voltage to the power supply side positive terminal and a constant current control circuit unit connected in series to the power supply side positive terminal or the power supply side negative terminal was used. A power supply method for an LED lighting device,
Whether the illumination connected to each terminal on the power supply side is constant voltage drive type LED illumination or constant current drive type LED illumination, a current flowing by a predetermined voltage applied between the power supply side positive terminal and the sensing terminal is determined. A driving method determining step to determine using,
When the illumination connected to each terminal on the power source side is a constant voltage drive type LED illumination, a predetermined current is passed through the constant voltage drive type LED illumination by the constant current control circuit unit, and the minus of the constant current drive type LED illumination A power supply method for an LED illumination device, comprising: a constant voltage drive control step of determining a rated voltage of the constant voltage drive type LED illumination by detecting a voltage at a terminal. Constant voltage drive type LED lighting to be energized with a predetermined rated voltage is connected, and has a power supply side positive terminal to which the illumination side positive terminal is connected and a power supply side negative terminal to which the illumination side negative terminal is connected,
A variable power supply unit for applying a variable voltage to the power supply side positive terminal;
A constant current control circuit unit connected in series to the power supply side positive terminal or the power supply side negative terminal;
The constant current control circuit unit applies a predetermined current to the constant voltage drive type LED illumination, and detects the voltage at the negative terminal of the constant voltage drive type LED illumination, thereby determining the rated voltage of the constant voltage drive type LED illumination. A constant voltage drive control unit,
A characteristic data storage unit that stores characteristic data indicating current-voltage characteristics of each of the plurality of types of constant current drive type LED lightings;
The constant voltage drive type LED when the constant voltage drive control unit applies a predetermined voltage to the plus terminal of the constant voltage drive type LED illumination and causes the constant current control circuit unit to pass a predetermined constant current. A power supply system for an LED lighting device that determines a rated voltage of a connected constant voltage driving type LED lighting from a differential voltage between a plus terminal voltage and a minus terminal voltage of lighting and a current-voltage characteristic indicated by the characteristic data.