JP2020107432A - Electric power unit, load drive system, and illumination system - Google Patents

Abstract

To simplify circuit structure.SOLUTION: An electric power unit 1 includes multiple DC power supply circuits 10 electrically connected in parallel, and multiple MOSFETs 11, in one-to-one correspondence with the multiple DC power supply circuits 10, and electrically connected in forward direction with the output terminals 101 of corresponding multiple DC power supply circuits 10, respectively. The electric power unit 1 includes multiple drive circuits 12, in one-to-one correspondence with the multiple MOSFETs 11 and turning the multiple MOSFETs 11 ON/OFF, respectively. Each of the multiple DC power supply circuits 10 includes a switching power supply circuit 102 having a transformer T1 for electrically insulating an input terminal 100 and an output terminal 101. The drive circuit 12 operates with a voltage Vn3 induced in the auxiliary winding N3 of the transformer T1, and turns the MOSFET11 ON, when the voltage Vn3 goes above a threshold level. The drive circuit 12 turns the MOSFET11 OFF, when the voltage Vn3 goes below the threshold level.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a power supply device, a load driving system, and a lighting system. More specifically, the present disclosure relates to a power supply device including a plurality of power supply circuits electrically connected in parallel to a load, a load drive system including the power supply device and the load, and lighting that is the power supply device and the load. Lighting system with load.

As a conventional example, a DC power supply device described in Patent Document 1 will be illustrated. In the conventional example described in Patent Document 1, a plurality of DC power supply units and a negative electrode and a positive electrode of adjacent DC power supply units which are connected to the output terminals of the plurality of DC power supply units via diodes for preventing backflow are provided. And a plurality of switch circuits connected to each other. Furthermore, the conventional example described in Patent Document 1 includes a control circuit that selectively controls the plurality of switch circuits and connects the plurality of DC power supply units in series, parallel, or series-parallel. The reverse current blocking diode is a parasitic diode of a field effect transistor. The field effect transistor is switched between an on state and an off state by a gate control signal output from the control circuit. In the conventional example described in Patent Document 1, since the parasitic diode of the field effect transistor is used as the diode for blocking the reverse current, the forward voltage drop is reduced and the loss is reduced as compared with the case where the diode which is an independent circuit component is used. Is being reduced.

JP, 2003-304688, A

By the way, in the conventional example described in Patent Document 1, when any of the output terminals of the DC power supply unit is short-circuited, the parasitic diode of the field effect transistor prevents the backflow of current. In the conventional example described in Patent Document 1, a field effect transistor is on/off controlled by a control circuit including a microprocessor or a logic circuit. However, in such a power supply device (DC power supply device), simplification of the circuit configuration is desired, and in the conventional example described in Patent Document 1, it is difficult to simplify the circuit configuration.

An object of the present disclosure is to provide a power supply device, a load driving system, and a lighting system that can simplify the circuit configuration.

A power supply device according to an aspect of the present disclosure includes a plurality of DC power supply circuits in which respective output terminals are electrically connected in parallel to a load. The power supply device includes a plurality of semiconductor switching elements that correspond one-to-one with the plurality of DC power supply circuits and are electrically connected to the output terminals of the corresponding plurality of DC power supply circuits in the forward direction. The power supply device includes a plurality of drive circuits that correspond to the plurality of semiconductor switching elements in a one-to-one manner and that turn on/off each of the corresponding plurality of semiconductor switching elements. Each of the plurality of DC power supply circuits has a switching power supply circuit having a transformer for electrically insulating the input terminal and the output terminal. The drive circuit operates with a voltage induced in the auxiliary winding of the transformer, and turns on the semiconductor switching element when the voltage is equal to or higher than a threshold value. The drive circuit turns off the semiconductor switching element when the voltage is less than the threshold value.

A load drive system according to an aspect of the present disclosure includes the power supply device and one or more loads driven by the power supply device.

An illumination system according to an aspect of the present disclosure includes the power supply device and one or more lighting loads driven by the power supply device.

The power supply device, the load driving system, and the lighting system according to the present disclosure have an effect that the circuit configuration can be simplified.

FIG. 1 is a configuration diagram illustrating a circuit configuration of a power supply device 1 according to an embodiment of the present disclosure, a load drive system, and a system configuration of a lighting system. FIG. 2 is a circuit configuration diagram of a main part of the above power supply device. FIG. 3 is a system configuration diagram of the above illumination system. FIG. 4A is a time chart of the output current of the first DC power supply circuit in the above power supply device. FIG. 4B is a time chart of the output current of the second DC power supply circuit in the above power supply device. FIG. 4C is a time chart of the output current of the third DC power supply circuit in the above power supply device. FIG. 4D is a time chart of the total output current of the above power supply device. FIG. 5: is a system block diagram of the illumination system of the modification same as the above.

A power supply device, a load driving system, and a lighting system according to embodiments of the present disclosure will be described in detail with reference to the drawings. However, the drawings described in the embodiments below are schematic views, and the respective ratios of the sizes and thicknesses of the respective constituent elements do not necessarily reflect the actual dimensional ratios. The configurations described in the embodiments below are merely examples of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications can be made according to the design and the like as long as the effects of the present disclosure can be exhibited.

As shown in FIG. 1, the load drive system 2 according to the embodiment includes a power supply device 1 according to the embodiment and one or more loads 20 driven by the power supply device 1. The load 20 is, for example, a lighting load (lighting fixture 30). The load drive system 2 in the case where the load 20 is the lighting load 30 corresponds to the embodiment of the lighting system 3. In the following description, a case where the load 20 is a lighting load (lighting fixture 30) and the load driving system 2 corresponds to the lighting system 3 will be described. However, the load 20 is not limited to a lighting load, but is preferably a load having a generally constant voltage characteristic (voltage-current characteristic such that a change in load voltage is sufficiently small with respect to a change in load current).

The lighting fixture 30 includes a plurality (three in the illustrated example) of LEDs (Light Emitting Diodes) 300. The plurality of LEDs 300 are electrically connected in series. The lighting fixture 30 may have a solid-state light source such as an organic electroluminescence element or a semiconductor laser instead of the LED 300.

The power supply device 1 converts, for example, AC power supplied from a commercial power system 4 into DC power and supplies the DC power to a lighting load (lighting fixture 30). As shown in FIG. 1, the power supply device 1 includes a plurality (three in the illustrated example) of DC power supply circuits 10, a plurality of (the same number as the DC power supply circuits 10) semiconductor switching elements (MOSFETs 11 ), and a plurality of (the same number as MOSFET 11 ). ) Drive circuit 12). In the following description, in order to distinguish the three DC power supply circuits 10, they may be referred to as a first DC power supply circuit 10A, a second DC power supply circuit 10B, and a third DC power supply circuit 10C. However, since the three DC power supply circuits 10 have a common circuit configuration, the detailed circuit configuration of only one DC power supply circuit 10 (first DC power supply circuit 10A) is shown in FIG.

The DC power supply circuit 10 includes a pair of input terminals 100, a pair of output terminals 101, a first rectifier circuit DB1, a second rectifier circuit DB2, a switching power supply circuit 102, a PFC circuit 103, an abnormality detection circuit 13, a first control circuit 15 and It has a second control circuit 16. The pair of input terminals 100 are electrically connected to the positive electrode and the negative electrode of the power system 4 in a one-to-one relationship. The pair of output terminals 101 are electrically connected to the positive electrode and the negative electrode of the lighting fixture 30 in a one-to-one relationship. That is, the three DC power supply circuits 10 are electrically connected in parallel to the power system 4 and the lighting fixture 30.

The first rectifier circuit DB1 is a diode bridge. One positive electrode and one negative electrode of the power system 4 are electrically connected to each of the pair of AC input terminals of the first rectifier circuit DB1. A smoothing capacitor C0 is electrically connected between the pulsating current output terminals of the first rectifier circuit DB1. The AC voltage input from the power system 4 is full-wave rectified by the first rectifier circuit DB1 and then smoothed by the capacitor C0.

A PFC (Power Factor Correction) circuit 103 is electrically connected to both ends of the capacitor C0. The PFC circuit 103 has a choke coil L1, a diode D1, a switching element Q1 and a smoothing capacitor C1. The PFC circuit 103 improves the power factor by boosting the voltage across the capacitor C0. The switching element Q1 is switched by the first control circuit 15. The first control circuit 15 performs PWM (Pulse Width Modulation) control of the switching element Q1 so that the voltage across the smoothing capacitor C1 becomes a constant voltage.

The switching power supply circuit 102 steps down the output voltage of the PFC circuit 103 (voltage across the smoothing capacitor C1) to a DC voltage required by the lighting load (lighting fixture 30). The switching power supply circuit 102 in the embodiment is a so-called LLC current resonance converter. The switching power supply circuit 102 includes a half-bridge circuit in which two switching elements Q2 and Q3 are electrically connected in series, a resonance capacitor C2 and an inductor L2, a transformer T1, a second rectifier circuit DB2, and a smoothing capacitor. With C3. The resonance capacitor C2, the inductor L2, and the primary winding N1 of the transformer T1 are electrically connected in series to the switching element Q3 of the lower arm. Both ends of the secondary winding N2 of the transformer T1 are electrically connected to the pair of AC input terminals of the second rectifier circuit DB2. A smoothing capacitor C3 is electrically connected in series to the pair of pulsating current output terminals of the second rectifier circuit DB2. Both ends of the capacitor C3 are electrically connected in series with the pair of output terminals 101 one by one.

The two switching elements Q2 and Q3 are switched by the second control circuit 16. The second control circuit 16 converts the DC voltage input from the PFC circuit 103 into a rectangular wave pulse voltage by performing PFM (Pulse Frequency Modulation) control on the two switching elements Q2 and Q3. .. Then, the pulsed voltage is converted into a sine wave voltage having a frequency corresponding to the switching frequency of the PFM control by the series resonance circuit of the resonance capacitor C2, the inductor L2, and the primary winding N1 of the transformer T1. This sine wave voltage is stepped down by the transformer T1, full-wave rectified by the second rectifier circuit DB2, smoothed by the capacitor C3, and converted into a DC voltage.

The source of the MOSFET 11 is electrically connected to the output terminal 101 on the high potential side (positive electrode) of the pair of output terminals 101 of the DC power supply circuit 10. The drain of the MOSFET 11 is electrically connected to the positive electrode of the lighting load (lighting fixture 30). The MOSFET 11 is an enhancement-type N-channel MOSFET, and a parasitic diode exists between the source and the drain.

The drive circuit 12 controls ON/OFF of the MOSFET 11 by adjusting the gate-source voltage of the MOSFET 11. The drive circuit 12 operates with the voltage Vn3 induced in the auxiliary winding N3 of the transformer T1 of the DC power supply circuit 10, and turns on the MOSFET 11 when the voltage Vn3 is equal to or higher than the threshold value. Further, the drive circuit 12 turns off the MOSFET 11 when the voltage Vn3 is less than the threshold value. The voltage Vn3 input to the drive circuit 12 is half-wave rectified by the diode D2 and smoothed by the capacitor C4. Then, if the voltage is not induced in the auxiliary winding N3, the charged electric charge of the capacitor C4 is discharged through the resistor R2, and the voltage Vn3 falls below the threshold value.

The DC power supply circuit 10 also has an abnormality detection circuit 13. The abnormality detection circuit 13 detects the voltage across the resistor R1 inserted between the switching power supply circuit 102 and the output terminal 101 on the low potential side (negative electrode). The abnormality detection circuit 13 compares the voltage across the resistor R1 with a threshold value, and detects the occurrence of an abnormality when the voltage across the resistor R1 is less than the threshold value. If no abnormality occurs in the DC power supply circuit 10 and the power supply device 1, the output current (load current) of the switching power supply circuit 102 flows through the resistor R1 and the voltage across the resistor R1 exceeds the threshold value. Therefore, the abnormality detection circuit 13 does not detect the occurrence of abnormality. On the other hand, when some failure occurs in the DC power supply circuit 10 or the power supply device 1, for example, when the capacitor C3 of the switching power supply circuit 102 has a short-circuit failure, current does not flow in the resistor R1 and therefore the voltage across the resistor R1 becomes a threshold. Below the value. The abnormality detection circuit 13 detects the occurrence of the abnormality due to the voltage across the resistor R1 falling below the threshold value, and informs the second control circuit 16 that the abnormality has been detected. Specifically, the abnormality detection circuit 13 and the second control circuit 16 are connected by the photocoupler PC, and the abnormality detection circuit 13 transmits the detection of the abnormality occurrence to the second control circuit 16 through the photocoupler PC. The second control circuit 16 preferably stops the switching power supply circuit 102 or lowers the output voltage when the abnormality detection circuit 13 reports that the abnormality has occurred.

Here, when the capacitor C3 of the switching power supply circuit 102 has a short circuit failure as described above, the induced voltage of the secondary winding N2 of the transformer T1 and the induced voltage (voltage Vn3) of the auxiliary winding N3 decrease. When the voltage Vn3 drops below the threshold value, the drive circuit 12 turns off the MOSFET 11. When the MOSFET 11 is turned off, the switching power supply circuit 102 (DC power supply circuit 10) in which the capacitor C3 has a short circuit fault is electrically disconnected from the other DC power supply circuit 10. As a result, the normal output current of the DC power supply circuit 10 is prevented from flowing back to the DC power supply circuit 10 in which the abnormality has occurred.

In the power supply device 1, since the semiconductor switching element (MOSFET 11) is used as the circuit element that blocks the reverse flow of the current to each DC power supply circuit 10, the power consumption of the circuit element is reduced as compared with the case where the diode is used. be able to. In addition, when some abnormality occurs in the power supply device 1, the voltage supplied to the drive circuit 12 decreases, and the normally open (normally off) MOSFET 11 is immediately turned off. Therefore, the circuit configuration can be simplified as compared with the case where the field effect transistor is on/off controlled by the control circuit including the microprocessor or the logic circuit as in the conventional example described in Patent Document 1.

By the way, when the operating voltage of the abnormality detection circuit 13 is secured from the output voltage of the switching power supply circuit 102, the power supply to the abnormality detection circuit 13 is cut off when the capacitor C3 of the switching power supply circuit 102 has a short circuit failure as described above. There is a possibility that

Therefore, the power supply device 1 preferably includes a control power supply circuit 14 that generates a control power supply voltage from the output voltage of the PFC circuit 103 (voltage across the smoothing capacitor C1) (see FIG. 2). It is preferable that the plurality of abnormality detection circuits 13 operate with the control power supply voltage generated by the control power supply circuit 14.

The control power supply circuit 14 is a flyback converter. As shown in FIG. 2, the control power supply circuit 14 has a switching element Q4, a transformer T2, a diode D3, and a smoothing capacitor C5. The switching element Q4 is an enhancement type N-channel MOSFET. The drain of the switching element Q4 is electrically connected to one end of the capacitor C5 on the high potential side and the cathode of the diode D4. The anode of the diode D4 is electrically connected to the high-potential-side output terminal of the PFC circuit 103 (the high-potential-side terminal of the smoothing capacitor C1). The control power supply circuit 14 supplies the DC voltage (control power supply voltage Vcc) obtained by reducing the voltage across the capacitor C5 to the abnormality detection circuit 13 from both ends of the capacitor C4 by switching the switching element Q4.

In the power supply device 1, since the abnormality detection circuit 13 operates by the control power supply voltage Vcc generated by the insulating control power supply circuit 14, the electrical insulation between the primary side and the secondary side of the switching power supply circuit 102 is maintained. Until then, the abnormality detection circuit 13 can be stably operated.

The control power supply voltage Vcc for operating the first control circuit 15 and the second control circuit 16 is also preferably generated from the output voltage of the PFC circuit 103. For example, as shown in FIG. 2, the current flowing in the primary winding of the transformer T2 is smoothed by the capacitor C6 to generate a direct current voltage, and the direct current voltage is converted into a constant voltage by the three-terminal regulator 104, thereby controlling the control power supply voltage. Vcc may be generated.

Here, an example of a system configuration of the illumination system 3 according to the embodiment will be described with reference to FIG. The lighting system 3 illustrated in FIG. 3 includes three lighting fixtures 30, one power supply device 1, and one power supply cable 181 that electrically connects the one power supply device 1 and the three lighting fixtures 30. Have and. However, the number of lighting fixtures 30 and the number of power supply devices 1 included in the lighting system 3 are not limited to three and one, respectively.

The power supply device 1 preferably includes a case 180 that accommodates the three DC power supply circuits 10, the MOSFET 11, and the drive circuit 12. The case 180 is formed in a box shape with an electric conductor (for example, metal). The case 180 is preferably grounded at a place having a stable potential (for example, ground).

The power supply cable 181 has two power supply lines 182A and 182B and a sheath 183 that covers these two power supply lines 182A and 182B. One end of one power supply line 182A is branched and connected to the output terminal 101 on the high potential side of the DC power supply circuit 10 via the three MOSFETs 11 in the case 180 of the power supply device 1. One end of the other power supply line 182B is branched and connected to the output terminal 101 on the low potential side of each of the three DC power supply circuits 10 in the case 180 of the power supply device 1. The other end of one power supply line 182A is branched and connected to the positive electrodes of the three lighting fixtures 30. The other end of the other power supply line 182B is branched and connected to the negative electrodes of the three lighting fixtures 30.

For example, the three lighting fixtures 30 are floodlights used for illuminating the stadium, and are installed at the tip (high place) of an illumination column or the like. On the other hand, the power supply device 1 is installed in, for example, a building provided in a stadium. That is, when the lighting device (power supply device) for lighting the floodlight is installed at a high place together with the floodlight, the maintenance work of the lighting device is a work at a high place, which imposes a heavy burden on a worker who performs the maintenance work. Will end up. On the other hand, in the lighting system 3 according to the embodiment, since the power supply device 1 can be installed at a place distant from the lighting fixture 30, compared to the case where the power supply device 1 is installed at a high place like the lighting fixture 30. Therefore, the workability of maintenance work can be improved. Moreover, since one power supply device 1 and a plurality of (three in the illustrated example) lighting fixtures 30 are connected by one power supply cable 181, wiring can be saved.

Here, since the three DC power supply circuits 10 and the two power supply lines 182A and 182B are housed in the case 180 formed of an electrical conductor, the high frequency noise generated from the switching power supply circuit 102 is radiated noise and thus the case 180 is generated. Can be prevented from leaking outside.

Furthermore, the lighting system 3 preferably comprises a controller 5. The controller 5 is electrically connected to the power supply device 1 via the signal line 50 (see FIG. 3). The controller 5 transmits a dimming signal via the signal line 50. The controller 5 transmits, for example, a PWM signal as a dimming signal to the power supply device 1. That is, the controller 5 indicates the dimming level to the power supply device 1 by the duty ratio of the dimming signal (PWM signal).

On the other hand, the power supply device 1 includes a dimming signal reception circuit 17 that receives the dimming signal transmitted from the controller 5 in each DC power supply circuit 10 (see FIG. 2 ). The dimming signal receiving circuit 17 converts the dimming signal received from the controller 5 into a dimming signal having a voltage corresponding to the duty ratio of the PWM signal by integrating the dimming signal in the integrating circuit. The dimming signal receiving circuit 17 outputs the converted dimming signal to the second control circuit 16. The second control circuit 16 adjusts the switching frequency of the PFM control according to the voltage of the dimming signal received from the dimming signal receiving circuit 17, and changes the magnitude of the current supplied to the lighting device 30 to control the lighting device 30. Dimming.

Further, it is preferable that the dimming signal receiving circuit 17 also outputs the converted dimming signal to the abnormality detecting circuit 13. The abnormality detection circuit 13 detects the presence or absence of abnormality according to the dimming level instructed by the dimming signal, that is, the magnitude of the output current (output current of the DC power supply circuit 10) corresponding to the dimming level. It is preferable to change the condition (threshold value) for Specifically, the abnormality detection circuit 13 preferably reduces the threshold value to be compared with the voltage across the resistor R1 as the dimming level decreases (the output current decreases). In other words, if the abnormality detection circuit 13 changes the threshold value according to the dimming level, the abnormality detection circuit 13 may erroneously detect the occurrence of an abnormality when the output current decreases according to the dimming level. Can be lowered.

In the power supply device 1, when any of the abnormality detection circuits 13 detects the occurrence of an abnormality, it is not preferable to leave the DC power supply circuit 10 in which the abnormality has occurred. Therefore, it is preferable that the power supply device 1 includes a notification unit that notifies the abnormality detection of the abnormality detection circuit 13. In the power supply device 1, for example, among the plurality of DC power supply circuits 10, the second control circuit 16 of the DC power supply circuit 10 in which the abnormality detection is not detected by the abnormality detection circuit 13 adjusts the output current so that the lighting fixture 30 is controlled. It is preferable to make it blink. Alternatively, the second control circuit 16 may cause the lighting device 30 to transmit an optical signal by adjusting the output current. In this case, the second control circuit 16 corresponds to the notification unit. Alternatively, the abnormality detection circuit 13 may notify the controller 5 of the abnormality detection, and the controller 5 may transmit a dimming signal to the power supply device 1 to notify the power supply device 1 (blinking of the lighting fixture 30).

When the notification unit of the power supply device 1 notifies the abnormality detection, the administrator who manages the lighting fixture 30 is informed of the occurrence of the abnormality of the power supply device 1, and appropriate measures such as repair of the power supply device 1 (DC power supply circuit 10) are taken. Can be encouraged to take place.

However, even if the notification unit of the power supply device 1 reports the abnormality detection as described above, some time is required until the DC power supply circuit 10 in which the abnormality has occurred is repaired or replaced and restored. Therefore, in the power supply device 1, it is desirable to suppress a decrease in the light amount of the lighting fixture 30 by temporarily increasing the output current of the normal DC power supply circuit 10 until the DC power supply circuit 10 in which the abnormality has occurred is restored. ..

4A to 4C are time charts in which the horizontal axis represents time and the vertical axis represents the magnitude of the output current of each of the three DC power supply circuits 10. 4D is a time chart in which the horizontal axis represents time and the vertical axis represents the total output current of the three DC power supply circuits 10 (output current of the power supply device 1). As shown in FIGS. 4A to 4C, during the period from time t=0 to time t=t1, all three DC power supply circuits 10 output normal and rated output currents. Therefore, in the period from time t=0 to time t=t1, an output current that is three times the output current of one DC power supply circuit 10 flows from the power supply device 1 to the three lighting fixtures 30.

When the first DC power supply circuit 10A fails and the output current stops at time t=t1, the output current of the first DC power supply circuit 10A becomes zero, so the total output from the power supply device 1 is reduced. The current is reduced by two thirds. As a result, the total amount of light of the three lighting fixtures 30 also decreases to two-thirds of the amount of light from time t=0 to time t=t1.

Therefore, in the power supply device 1, the fact that the abnormality detection circuit 13 of the first DC power supply circuit 10A has detected the occurrence of abnormality is also notified to the second control circuit 16 of each of the second and third DC power supply circuits 10B and 10C. Tell. Then, the second control circuit 16 of each of the second and third DC power supply circuits 10B and 10C controls the switching power supply circuit 102 of each of the second and third DC power supply circuits 10B and 10C to output an output current of 30. % Increase (time t=t2). As a result, the total output current output from the power supply device 1 increases from 2/3 to 26/30, so that the total light amount of the three lighting fixtures 30 also changes from time t=0 to time t=t1. It can be increased from 2/3 to 26/30 (see FIG. 4D). Therefore, the power supply device 1 can suppress a decrease in illuminance until the failed DC power supply circuit 10 (first DC power supply circuit 10A) is restored.

Here, an example of a system configuration of a modified example of the illumination system 3 will be described with reference to FIG. In the lighting system 3 of the modified example shown in FIG. 5, three lighting fixtures 30 are electrically connected in series to one power supply device 1 via one power cable 181. In the lighting system 3 of the modified example, even if the voltage-current characteristics of the three lighting fixtures 30 are not equal, the same current can flow through the three lighting fixtures 30. However, in the illumination system 3 of the modified example, it is necessary to increase the output voltage of the power supply device 1 (for example, about 3 times) as compared with the illumination system 3 according to the embodiment (see FIG. 3 ).

Also in the lighting system 3 of the modified example, since the power supply device 1 can be installed at a place distant from the lighting fixture 30, compared with the case where the power supply device 1 is installed at a high place like the lighting fixture 30, maintenance work can be performed. Workability can be improved. Moreover, since one power supply device 1 and a plurality of (three in the illustrated example) lighting fixtures 30 are connected by one power supply cable 181, wiring can be saved.

As described above, the power supply device (1) according to the first aspect includes the plurality of DC power supply circuits (10) in which the output terminals (101) are electrically connected in parallel to the load (20). .. The power supply device (1) according to the first aspect has a one-to-one correspondence with a plurality of DC power supply circuits (10), and is forwardly connected to the respective output terminals (101) of the corresponding plurality of DC power supply circuits (10). A plurality of semiconductor switching elements (MOSFET 11) electrically connected are provided. The power supply device (1) according to the first aspect includes a plurality of drive circuits (12) that correspond to the plurality of semiconductor switching elements in a one-to-one manner and that turn on/off each of the corresponding plurality of semiconductor switching elements. Each of the plurality of DC power supply circuits (10) has a switching power supply circuit (102) having a transformer (T1) for electrically insulating the input terminal (100) and the output terminal (101). The drive circuit (12) operates with the voltage (Vn3) induced in the auxiliary winding (N3) of the transformer (T1), and turns on the semiconductor switching element when the voltage (Vn3) is equal to or higher than the threshold value. The drive circuit (12) turns off the semiconductor switching element when the voltage (Vn3) is less than the threshold value.

Since the power supply device (1) according to the first aspect uses the semiconductor switching element as the circuit element that blocks the reverse flow of the current to each DC power supply circuit (10 ), the circuit element in the circuit element is different from that in the case of using the diode. It is possible to reduce power consumption. Moreover, in the power supply device (1) according to the first aspect, the semiconductor switching element is immediately turned off when the voltage (Vn3) supplied to the drive circuit (12) is reduced when some abnormality occurs. As a result, in the power supply device (1) according to the first aspect, compared to the case of controlling the field effect transistor on/off by the control circuit including the microprocessor or the logic circuit as in the conventional example described in Patent Document 1, The circuit configuration can be simplified.

The power supply device (1) according to the second aspect can be realized by a combination with the first aspect. In the power supply device (1) according to the second aspect, the semiconductor switching element is preferably a field effect transistor.

The power supply device (1) according to the second aspect can further reduce the power consumption by using the field effect transistor as the semiconductor switching element.

The power supply device (1) according to the third aspect can be realized by a combination with the first or second aspect. The power supply device (1) according to the third aspect corresponds to the plurality of DC power supply circuits (10) on a one-to-one basis, and detects a plurality of abnormalities in each of the corresponding plurality of DC power supply circuits (10). It is preferable to include a detection circuit (13). Each of the plurality of DC power supply circuits (10) may reduce the output to the load (20) when the corresponding abnormality detection circuit (13) among the plurality of abnormality detection circuits (13) detects an abnormality. preferable.

In the power supply device (1) according to the third aspect, when the abnormality detection circuit (13) detects an abnormality, the DC power supply circuit (10) corresponding to the abnormality detection circuit (13) outputs to the load (20). By reducing the power consumption, it is possible to suppress unnecessary power consumption.

The power supply device (1) according to the fourth aspect can be realized by a combination with the third aspect. In the power supply device (1) according to the fourth aspect, each of the plurality of DC power supply circuits (10) preferably has an AC/DC conversion circuit (PFC circuit 103) that converts an AC voltage into a DC voltage. It is preferable that the switching power supply circuit (102) voltage-converts the DC voltage output from the AC/DC conversion circuit. It is preferable that the power supply device (1) according to the fourth aspect includes a control power supply circuit (14) that generates a control power supply voltage (Vcc) from the DC voltage output from the AC-DC converter circuit. It is preferable that the plurality of abnormality detection circuits (13) operate by the control power supply voltage (Vcc) generated by the control power supply circuit (14).

The power supply device (1) according to the fourth aspect operates the abnormality detection circuit (13) stably because the abnormality detection circuit (13) operates by the control power supply voltage (Vcc) generated by the control power supply circuit (14). Can be made.

The power supply device (1) according to the fifth aspect can be realized by a combination with the third or fourth aspect. In the power supply device (1) according to the fifth aspect, it is preferable that each of the plurality of DC power supply circuits (10) can adjust the output current supplied to the load (20). Each of the plurality of abnormality detection circuits (13) is a condition for detecting the presence or absence of abnormality according to the magnitude of the output current of the corresponding DC power supply circuit (10) of the plurality of DC power supply circuits (10). Is preferably changed.

The power supply device (1) according to the fifth aspect can reduce the possibility that the abnormality detection circuit (13) will erroneously detect the occurrence of an abnormality when the output current becomes small.

The power supply device (1) according to the sixth aspect can be realized by a combination with any one of the third to fifth aspects. In the power supply device (1) according to the sixth aspect, the abnormality detection circuit (13) corresponding to at least one DC power supply circuit (10) of the plurality of DC power supply circuits (10) outputs to the load (20). It is preferable that one or more DC power supply circuits (10) except the DC power supply circuit (10) whose output is decreased by the abnormality detection circuit (13) increase the output to the load.

The power supply device (1) according to the sixth aspect can suppress a decrease in the total output supplied to the load (20) even when an abnormality occurs in any of the DC power supply circuits (10).

The power supply device (1) according to the seventh aspect can be realized by a combination with any one of the third to sixth aspects. In the power supply device (1) according to the seventh aspect, an announcing unit (notifying an anomaly is detected when at least one anomaly detecting circuit (13) of the plurality of anomaly detecting circuits (13) detects an anomaly. 2 control circuit 16) is preferably provided.

In the power supply device (1) according to the seventh aspect, the notification unit notifies that an abnormality has occurred, so that the DC power supply circuit (10) in which the abnormality has occurred can be appropriately repaired. ..

The power supply device (1) according to the eighth aspect can be realized by a combination with any one of the first to seventh aspects. The power supply device (1) according to the eighth aspect preferably includes a case (180) that houses a plurality of DC power supply circuits (10). A power supply device (1) according to an eighth aspect is a power supply cable (a) having a plurality of power supply lines (182A, 182B) each electrically connected to an output terminal (101) of a plurality of DC power supply circuits (10). 181) is preferably provided. The output terminal (101) of each of the plurality of DC power supply circuits (10) is preferably electrically connected to the load (20) via a power supply cable (181).

The power supply device (1) according to the eighth aspect can prevent high frequency noise generated in the DC power supply circuit (10) from leaking out of the case (180) as radiation noise.

A load drive system (2) according to a ninth aspect is a power supply device (1) according to any one of the first to eighth aspects, and one or more loads (20) driven by the power supply device (1). Have and.

The load drive system (2) according to the ninth aspect can simplify the circuit configuration.

The load drive system (2) according to the tenth aspect can be realized by a combination with the ninth aspect. The load drive system (2) according to the tenth aspect preferably has a plurality of loads (20). It is preferable that a plurality of loads (20) are electrically connected in parallel to the power supply device (1).

The load driving system (2) according to the tenth aspect can drive a plurality of loads (20) with one power supply device (1).

The load drive system (2) according to the eleventh aspect can be realized by a combination with the ninth aspect. The load drive system (2) according to the eleventh aspect preferably has a plurality of loads (20). It is preferable that a plurality of loads (20) are electrically connected in series to the power supply device (1).

The load drive system (2) according to the eleventh aspect can drive a plurality of loads (20) with one power supply device (1).

A lighting system (3) according to a twelfth aspect includes a power supply device (1) according to any one of the first to eighth aspects, and one or more lighting loads (lighting fixtures) driven by the power supply device (1). 30) and.

The illumination system (3) according to the twelfth aspect can simplify the circuit configuration.

The illumination system (3) according to the thirteenth aspect can be realized in combination with the twelfth aspect. The lighting system (3) according to the thirteenth aspect preferably has a plurality of lighting loads. It is preferable that a plurality of lighting loads be electrically connected in parallel to the power supply device (1).

The lighting system (3) according to the thirteenth aspect can drive (light up) a plurality of lighting loads (lighting fixtures 30) with one power supply device (1).

The illumination system (3) according to the fourteenth aspect can be realized in combination with the twelfth aspect. The illumination system (3) according to the fourteenth aspect preferably has a plurality of illumination loads. It is preferable that a plurality of lighting loads be electrically connected in series to the power supply device (1).

The lighting system (3) according to the fourteenth aspect can drive (light up) a plurality of lighting loads (lighting fixtures 30) with one power supply device (1).

1 Power Supply Device 2 Load Drive System 3 Lighting System 10 DC Power Supply Circuit 11 MOSFET (Semiconductor Switching Element)
12 Drive Circuit 13 Abnormality Detection Circuit 14 Control Power Supply Circuit 20 Load 30 Lighting Equipment (Lighting Load)
100 input terminal 101 output terminal 102 switching power supply circuit 103 PFC circuit (AC/DC conversion circuit)
180 case 181 power cable 182 power line T1 transformer N3 auxiliary winding Vn3 voltage induced in auxiliary winding Vcc control power supply voltage

Claims (14)

A plurality of DC power supply circuits in which each output terminal is electrically connected in parallel to the load,
One-to-one correspondence with the plurality of DC power supply circuits, a plurality of semiconductor switching elements electrically connected in the forward direction with each of the output terminals of the corresponding plurality of DC power supply circuits,
A plurality of drive circuits that correspond to the plurality of semiconductor switching elements in a one-to-one correspondence and that turn on/off each of the corresponding plurality of semiconductor switching elements;
Equipped with
Each of the plurality of DC power supply circuits has a switching power supply circuit having a transformer for electrically insulating the input terminal and the output terminal,
The drive circuit operates with a voltage induced in the auxiliary winding of the transformer, turns on the semiconductor switching device when the voltage is equal to or higher than a threshold value, and turns on when the voltage is lower than the threshold value. Turn off the semiconductor switching element,
Power supply. The semiconductor switching element is a field effect transistor,
The power supply device according to claim 1. Corresponding one-to-one with the plurality of DC power supply circuits, a plurality of abnormality detection circuit for detecting the presence or absence of each abnormality of the corresponding plurality of DC power supply circuit,
Each of the plurality of DC power supply circuits reduces the output to the load when the corresponding abnormality detection circuit of the plurality of abnormality detection circuits detects the abnormality,
The power supply device according to claim 1 or 2. Each of the plurality of DC power supply circuits,
It has an AC/DC conversion circuit that converts AC voltage to DC voltage,
The switching power supply circuit voltage-converts the DC voltage output by the AC/DC conversion circuit,
A control power supply circuit for generating a control power supply voltage from the DC voltage output from the AC-DC converter circuit;
The plurality of abnormality detection circuits operate by the control power supply voltage generated by the control power supply circuit,
The power supply device according to claim 3. Each of the plurality of DC power supply circuits is capable of adjusting the output current supplied to the load,
Each of the plurality of abnormality detection circuits changes the condition for detecting the presence or absence of the abnormality according to the magnitude of the output current of the corresponding DC power supply circuit of the plurality of DC power supply circuits,
The power supply device according to claim 3 or 4. When the abnormality detection circuit corresponding to at least one DC power supply circuit among the plurality of DC power supply circuits reduces the output to the load, the abnormality detection circuit reduces the output of the DC power supply circuit. Excluding one or more of the DC power supply circuit increases the output to the load,
The power supply device according to any one of claims 3 to 5. At least one of the plurality of abnormality detection circuits is provided with a notification unit that performs notification of the abnormality detection when the abnormality detection circuit detects the abnormality,
The power supply device according to any one of claims 3 to 6. A case accommodating the plurality of DC power supply circuits,
A power cable having a plurality of power supply lines, each of which is electrically connected to the output terminals of the plurality of DC power supply circuits,
Equipped with
The output terminal of each of the plurality of DC power supply circuit is electrically connected to the load via the power cable,
The power supply device according to claim 1. A power supply device according to claim 1;
And one or more loads driven by the power supply,
Load drive system. Having a plurality of the loads,
A plurality of the loads are electrically connected in parallel to the power supply device,
The load drive system according to claim 9. Having a plurality of the loads,
A plurality of the loads are electrically connected in series to the power supply device,
The load drive system according to claim 9. A power supply device according to claim 1;
And one or more lighting loads driven by the power supply,
Lighting system. Having a plurality of the lighting loads,
A plurality of the lighting loads are electrically connected in parallel to the power supply device,
The lighting system according to claim 12. Having a plurality of the lighting loads,
A plurality of the lighting loads are electrically connected in series to the power supply device,
The lighting system according to claim 12.

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