JP2012028271A - Electrical power system and lighting system using power supply device of the electrical power system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrical power system capable of reducing a manufacturing cost, and a lighting system using a power supply device of the electrical power system.SOLUTION: In the electrical power system, a first power supply device 11 and a second power supply device 12 have: two power supply circuits 21 and 31 and two power supply circuits 22 and 32, respectively; and control circuits 41 and 42 provided in each of the power supply circuits 21, 22, 31 and 32, respectively, and driving switching elements Q1-Q6. Since each of the control circuits 41 and 42 is used in both of the first power supply device 11 and the second power supply device 12, a manufacturing cost as the total of the first power supply device 11 and the second power supply device 12 can be reduced by mass production effects of each of the control circuits 41 and 42.

Description

  The present invention relates to a power supply system and a lighting device using the power supply device of the power supply system.

  Conventionally, a power supply device in which a half-bridge inverter is connected to a subsequent stage of an AC-DC converter has been provided (see, for example, Patent Document 1 and Patent Document 2).

  In the AC-DC converter, a known boost converter is connected between the DC output terminals of a diode bridge that performs full-wave rectification on AC power input from an AC power supply.

  The half-bridge inverter includes a series circuit of two switching elements and a resonance circuit connected between both ends of one switching element. The DC power output from the AC-DC converter is converted into AC power by resonance generated in the resonance circuit when the two switching elements are alternately turned on and off. The AC power output from the half-bridge inverter is used for lighting a hot cathode type discharge lamp, for example.

Japanese Patent No. 3521687 JP 2007-265700 A

  In the case of producing a plurality of types of power supply devices, the manufacturing cost can be reduced if there are more parts common to the plurality of types of power supply devices.

  The present invention has been made in view of the above-described reasons, and an object of the present invention is to provide a power supply system capable of reducing manufacturing costs and a lighting device using the power supply device of the power supply system.

  The power supply system of the present invention includes a first power supply device and a second power supply device, and each of the first power supply device and the second power supply device has at least one switching element and is input with electric power. Of the input side power supply circuit, the input side power supply circuit for converting each of the switching elements of the input side power supply circuit, and the input side power supply circuit having at least one switching element. An output-side power supply circuit for converting an output; and an output-side control circuit for driving each switching element of the output-side power supply circuit. The circuit configuration of the input-side control circuit in the first power supply device and the second The circuit configuration of the output-side control circuit in the power supply device is common to each other, and the circuit configuration of the output-side control circuit in the first power supply device and the second power supply device Characterized in that the circuit configuration of definitive the input control circuit are common to each other.

  In this power supply system, it is preferable that the output-side control circuit in the first power supply device alternately turns on and off two switching elements connected in series.

  Further, in this power supply system, in the first power supply device, the input-side power supply circuit has a boost converter, the output-side power supply circuit has a half-bridge inverter, and in the second power supply device, the input-side power supply circuit Preferably includes a step-up converter, and the output side power supply circuit includes a step-down converter.

  Furthermore, in this power supply system, it is preferable that in each of the first power supply device and the second power supply device, the input-side power supply circuit has a boost converter, and the output-side power supply circuit has a buck converter.

  The power supply system preferably includes an external connection terminal electrically connected to an output terminal on the high voltage side of the boost converter.

  Furthermore, in this power supply system, it is preferable that the inductance of one inductor of the boost converter and the buck converter is twice the inductance of the other inductor.

  In the power supply system, it is preferable that the input side control circuit and the output side control circuit are integrated in a one-chip integrated circuit in each of the first power supply device and the second power supply device. .

  The lighting device of the present invention is turned on by at least one of the first power supply device and the second power supply device and output power of the first power supply device or the second power supply device in any one of the power supply systems described above. And an optical light source.

  In this illumination device, it is preferable that a solid light-emitting element is provided as the electrical light source.

  According to the present invention, since each control circuit is used for both the first power supply device and the second power supply device, the first power supply device and the second power supply device can be connected to each other due to the mass production effect of each control circuit. The manufacturing cost as a whole can be reduced.

It is explanatory drawing which shows schematic structure of Embodiment 1 of this invention. It is a circuit block diagram which shows a 1st power supply device same as the above. It is a circuit block diagram which shows the 2nd power supply device same as the above. It is explanatory drawing which shows an example of the time change of the on-off state of the switching element Q1 of the input side power supply circuit in the 1st power supply device same as the above, and circuit current IL1. It is explanatory drawing which shows an example of the time change of the input voltage VAC from AC power supply and circuit current IL1 in a 1st power supply device same as the above. It is explanatory drawing which shows an example of the time change of the on-off state of switching element Q2, Q3 of the output side power supply circuit in the 1st power supply device same as the above, and the output voltage VL. It is explanatory drawing which shows an example of the time change of the input voltage VAC from alternating current power supply in the same 2nd power supply device, and the electric current IL3 which flows into the inductor of an input side power supply circuit. (A) and (b) are the circuit block diagrams which respectively show Embodiment 2 of this invention, (a) shows a 1st power supply device, (b) shows a 2nd power supply device. It is a disassembled perspective view which shows an example of the illuminating device using the power supply device same as the above. It is a disassembled perspective view which shows another example of the illuminating device using the power supply device same as the above.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment 1)
The power supply system according to the present embodiment is a power supply system including a first power supply device 11 illustrated in FIGS. 1 and 2 and a second power supply device 12 illustrated in FIGS. 1 and 3. As a usage pattern, the first power supply device 11 and the second power supply device 12 may be used independently.

  Each of the power supply devices 11 and 12 includes input side power supply circuits 21 and 22 that convert alternating current power into direct current power, and output side power supply circuits 31 and 32 that convert direct current power input from the input side power supply circuits 21 and 22, respectively. With.

  Each of the power supply circuits 21, 22, 31, 32 is a so-called switching converter. The input-side power supply circuit 21 of the first power supply device 11 and the output-side power supply circuit 32 of the second power supply device 12 each have one switching element Q1, Q6. Further, the output-side power supply circuit 22 of the first power supply device 11 and the input-side power supply circuit 31 of the second power supply device 12 each have two switching elements Q2 to Q5 connected in series with each other. Each switching element Q1-Q6 consists of MOSFET, for example.

  Further, each of the power supply devices 11 and 12 alternately turns on and off the first switching circuit Q1 and Q6 and the two switching elements Q2 to Q5 alternately. A second control circuit 42. Each control circuit 41, 42 is composed of an integrated circuit.

  First, the first power supply device 11 will be described in detail mainly using FIG. An input-side power supply circuit (hereinafter referred to as “first input-side power supply circuit”) 21 of the first power supply device 11 is a diode bridge that performs full-wave rectification of AC power input from the AC power supply 6 via the low-pass filter 2a. 2b and a boost converter (boost chopper circuit) that converts the DC output of the diode bridge 2b into DC power of a predetermined voltage. That is, the first input side power supply circuit 21 includes an inductor L1 having one end connected to the DC output end on the high voltage side of the diode bridge 2b, a diode D1 having an anode connected to the other end of the inductor L1, and the diode An output capacitor C1 having one end connected to the cathode of D1 and the other end connected to the ground, and one end connected to a connection point between the inductor L1 and the diode D1 and the other end connected to a resistor (hereinafter referred to as “current detection resistor”). And a switching element Q1 connected to the ground via R1, and the voltage across the output capacitor C1 is used as the output voltage. As the output capacitor C1, for example, an electrolytic capacitor can be used.

  The first control circuit 41 serving as an input-side control circuit in the first power supply device 11 includes an output terminal OUT connected to the gate of the switching element Q1 and a voltage across the output capacitor C1 (that is, an output of the first input-side power supply circuit 21). Voltage) is divided by resistors R3 and R4 and input to feedback terminal FB1, current detection resistor R1 is input to current detection terminal CS to which voltage smoothed by resistor Rb and capacitor Cb is input, and inductor L1. A zero-cross terminal ZCD into which the voltage across the provided secondary winding is input via the resistor Rz, a comparison terminal CMP connected to the ground via the capacitor Ca, and the DC output voltage of the diode bridge 2b are the resistors R5 and R5. And a multiplication terminal MUL to which the voltage divided by R6 is input.

  Further, the first control circuit 41 includes a first comparator CP1 having an inverting input terminal connected to the feedback terminal FB1 and a constant voltage Va input to the non-inverting input terminal, and a capacitor Ca connected to the comparison terminal CMP. 1 a multiplier 41a that outputs a voltage obtained by multiplying the output voltage of the comparator CP1 by the input voltage from the multiplication terminal MUL; and the output voltage of the multiplier 41a is input to the inverting input terminal and non-inverted. A second comparator CP2 whose input terminal is connected to the current detection terminal CS; a third comparator CP3 whose constant voltage Vb is input to its inverting input terminal and whose non-inverting input terminal is connected to the zero-cross terminal ZCD; and a reset terminal R Is supplied with the output voltage of the second comparator CP2, and the third comparator CP is connected to the set terminal S. RS-type flip-flop circuit 41b to which the output voltage is input, and a buffer BF1 that converts the output voltage from the output terminal Q of the flip-flop circuit 41b into a voltage suitable for driving the switching element Q1 and outputs the voltage to the output terminal OUT With. That is, the switching element Q1 is turned on while the output of the flip-flop circuit 41b is at the H level, and the switching element Q1 is turned off while the output of the flip-flop circuit 41b is at the L level. Further, the output voltage of the third comparator CP3 becomes H level at the zero cross point of the current flowing through the inductor L1 connected to the zero cross terminal ZCD.

  Operations of the first input side power supply circuit 21 and the first control circuit 41 will be described. First, during the period when the switching element Q1 is on, energy is accumulated in the inductor L1, and the current flowing through the inductor L1 (hereinafter referred to as “circuit current”) IL1, that is, the current flowing through the switching element Q1 increases. Thus, the input voltage to the current detection terminal CS gradually increases. When the input voltage to the current detection terminal CS reaches the output voltage of the multiplier 41a, the output of the second comparator CP2 becomes H level, the output of the flip-flop circuit 41b becomes L level, and the switching element Q1 Driven off. During the period when the switching element Q1 is off, the output capacitor C1 is charged by the voltage on which the voltage of the inductor L1 is superimposed. During this time, the circuit current IL1 gradually decreases. When the circuit current IL1 reaches 0, the output of the third comparator CP3 becomes H level, so that the output of the flip-flop circuit 41b becomes H level, and the switching element Q1 is driven on. Thereafter, the same operation is repeated. That is, the first input side power supply circuit 21 operates in a so-called current critical mode. The on / off drive frequency of the switching element Q1 is sufficiently higher than the frequency of the AC power input from the AC power supply 6. With the above operation, the switching element Q1 is periodically turned on and off as shown in the lower part of FIG. 4, and the waveform of the circuit current IL1 becomes a triangular wave as shown in the upper part of FIG. The circuit current IL1 at the timing when the switching element Q1 is controlled to be off is proportional to the DC output voltage of the diode bridge 2b. Therefore, for the input voltage VAC from the AC power supply 6 as shown in the upper part of FIG. 5, the envelope of the circuit current IL1 substantially matches the waveform of the DC output voltage of the diode bridge 2b as shown in the lower part of FIG. The high-frequency component in the input current to the diode bridge 2b is suppressed by the low-pass filter 2a, so that the input current becomes sinusoidal, that is, the input current distortion is suppressed. In order to sufficiently suppress the input current distortion, it is desirable to maintain the voltage across the output capacitor C1 at or above the peak value of the input voltage from the AC voltage 6.

  An output side power supply circuit (hereinafter referred to as “first output side power supply circuit”) 31 of the first power supply device 11 is a so-called half-bridge inverter, and the DC power output from the first input side power supply circuit 21. Is converted into AC power and output to the discharge lamp 51, which is an electrical light source, to light the discharge lamp 51. That is, the first output side power supply circuit 31 includes a series circuit of two switching elements Q2 and Q3 connected between the output terminals of the first input side power supply circuit 21 and the current detection resistor R2, and switching on the low voltage side. An inductor L1 connected between both ends of a series circuit of the element Q3 and the current detection resistor R2 and a series circuit of two capacitors C2 and C3 are provided, and both ends of one capacitor C2 serve as output ends. Since the discharge lamp 51 is a known hot cathode type discharge lamp, detailed illustration and description thereof will be omitted. The switching elements Q2 and Q3 are connected such that the direction of the parasitic diode is opposite to the direction of the output voltage of the first input side power supply circuit 21, that is, the source is the ground side.

  The second control circuit 42 serving as an output side control circuit in the first power supply device 11 includes a feedback terminal FB2 to which a voltage obtained by smoothing the voltage across the current detection resistor R2 by the resistor Rc and the capacitor Cc is input, and a resistor Rt A resistor connection terminal RT connected to the ground via the capacitor Ct, a capacitor connection terminal CT connected to the ground via the capacitor Ct, and a high voltage side output terminal HO connected to the gate of the high voltage side switching element Q2. The source terminal VS connected to the source of the switching element Q2 on the high voltage side (that is, the drain of the switching element Q3 on the low voltage side), and connected to the source terminal VS via the capacitor Cd and fixed via the diode De. The first drive terminal VB connected to the voltage Vcc and maintained at a higher potential than the source terminal VS, and switching on the low voltage side Has a low-voltage side output terminal LO is connected to the gate of the child Q3, and a ground terminal GND connected to the ground, and a second drive terminal VD for the constant voltage Vcc is input.

  The second control circuit 42 is connected to the resistor connection terminal RT and the capacitor connection terminal CT, and the resistance value of the resistor Rt connected to the resistor connection terminal RT and the capacitance of the capacitor Ct connected to the capacitor connection terminal CT. Is provided with an oscillation circuit 42a that generates a rectangular wave having a frequency inversely proportional to the product of Furthermore, in order to prevent the two switching elements Q1 and Q2 from being turned on simultaneously, the second control circuit 42 includes a period during which one switching element Q1 is turned on and a period during which the other switching element Q2 is turned on. A period (hereinafter referred to as “dead time”) in which both switching elements Q1, Q2 are turned off is provided between the two. Specifically, the second control circuit 42 includes two dead time generation circuits 42b and 42c that shape the waveform of the output of the oscillation circuit 42a so that a dead time is formed. The output of one dead time generation circuit 42b is input to the high side buffer BF2 via the level shift circuit 42d. The high side buffer BF2 selectively switches and connects the high voltage side output terminal HO to one of the first drive terminal VB and the source terminal VS according to the output level of the level shift circuit 42d. The switching element Q2 whose gate is connected to the side output terminal HO is driven to turn on and off. The output of the other dead time generation circuit 42c is input to the low side buffer BF3 via the delay circuit 42e. The low side buffer BF3 selectively switches and connects the low voltage side output terminal LO to one of the second drive terminal VD and the ground terminal GND according to the output level of the delay circuit 42e. The switching element Q3 whose gate is connected to the terminal LO is driven to turn on and off. As described above, the two switching elements Q1 and Q2 of the first output-side power supply circuit 31 are alternately turned on and off at the output frequency of the oscillation circuit 42a (hereinafter referred to as “drive frequency”). Thereby, as shown in FIG. 6, the waveform of the output voltage VL of the first output side power supply circuit 31 becomes a sine wave.

  In the second control circuit 42, the inverting input terminal is connected to the feedback terminal FB2, the constant voltage Vc is input to the non-inverting input terminal, and the output terminal is connected between the oscillation circuit 42a and the resistance connection terminal RT via the resistor Rs. A fourth comparator CP4 connected to the connection point is provided. That is, the higher the average value of the voltage across the current detection resistor R2, the higher the drive frequency. Here, the drive frequency is set in a range higher than the resonance frequency of the resonance circuit formed by the inductor L2 and the capacitors C2 and C3 of the first output side power supply circuit 31 together with the discharge lamp 51. Therefore, since the output power to the discharge lamp 51 is reduced when the drive frequency is increased as described above, the output power to the discharge lamp 51 is feedback-controlled by the above operation.

  Next, the second power supply device 12 will be described in detail mainly using FIG.

  An input-side power supply circuit (hereinafter referred to as “second input-side power supply circuit”) 22 of the second power supply device 12 is a diode bridge that full-wave rectifies the AC power input from the AC power supply 6 via the low-pass filter 2a. A boost converter is connected between the output terminals of 2b. This step-up converter has two capacitors (hereinafter referred to as “input capacitors”) C4 and C5 connected in series between the DC output terminals of the diode bridge 2b, and an anode on the high voltage side of the diode bridge 2b. A first diode D2 connected to the DC output terminal, a second diode D3 whose cathode is connected to the DC output terminal on the low voltage side of the diode bridge 2b, a cathode of the first diode D2, and an anode of the second diode D3. A series circuit of two switching elements Q4 and Q5 connected to each other, an inductor L3 connected between a connection point between the input capacitors C4 and C5 and a connection point between the switching elements Q4 and Q5, An output capacitor C1 connected in parallel to a series circuit of two switching elements Q4 and Q5, and both output capacitors C1 Has an output end a. Further, one end on the low voltage side of the output capacitor C1 is connected to the ground.

  In the second control circuit 42 serving as an input-side control circuit in the second power supply device 12, the output voltage of the second input-side power supply circuit 22 is divided by the resistors R3 and R4 and the resistor Rc and the capacitor at the feedback terminal FB2. It is input after being smoothed with Cc. Other connections are the same as those of the first power supply device 11. That is, in the second control circuit 42, the high voltage side output terminal HO is connected to the gate of the high voltage side switching element Q4, and the low voltage side output terminal LO is connected to the gate of the low voltage side switching element Q5. . The source terminal VS of the second control circuit 42 is connected to the connection point between the two switching elements Q4 and Q5.

  The operation of the second input side power supply circuit 22 will be described. First, during the period when the high-voltage side switching element Q4 is turned on, current flows in the loop formed by the switching element Q4, the inductor L3, the low-voltage side input capacitor C5, the diode bridge 2b, and the first diode D2. The energy is stored in the inductor L3. During this period, the input capacitor C5 on the low voltage side is charged and the input voltage on the high voltage side is set so that the voltage across the series circuit of the two input capacitors C4 and C5 matches the DC output voltage of the diode bridge 2b. Capacitor C4 is discharged.

  Next, when the switching element Q4 on the high voltage side is turned off, the inductor L3, the input capacitor C4 on the high voltage side, the first diode D2, the output capacitor C1, and the parasitic diode of the switching element Q5 on the low voltage side are configured. The output capacitor C1 is charged by the current flowing in the loop using the inductor L3 as a power source. During this period, the energy of the inductor L3 is released, the input capacitor C4 on the high voltage side is further discharged, and the input capacitor C5 on the low voltage side is further charged.

  Next, when the switching element Q5 on the low voltage side is turned on, a current flows through a loop formed by the switching element Q5, the second diode D3, the diode bridge 2b, the input capacitor C4 on the high voltage side, and the inductor L3. Energy is stored in the inductor L3. During this period, the input capacitor C4 on the high voltage side is charged and the input voltage on the low voltage side is set so that the voltage across the series circuit of the two input capacitors C4 and C5 matches the DC output voltage of the diode bridge 2b. Capacitor C5 is discharged.

  Next, when the switching element Q5 on the low voltage side is turned off, the inductor L3, the parasitic diode of the switching element Q4 on the high voltage side, the output capacitor C1, the second diode D3, and the input capacitor C5 on the low voltage side are configured. The output capacitor C1 is charged by the current flowing in the loop using the inductor L3 as a power source. During this period, the energy of the inductor L3 is released, the input capacitor C5 on the low voltage side is further discharged, and the input capacitor C4 on the high voltage side is further charged.

  Thereafter, the above operation is repeated. The frequency of the above operation is sufficiently higher than the frequency of the input voltage VAC from the AC power supply 6. Further, as shown in FIG. 7, the envelope of the current IL3 flowing through the inductor L3 has a shape as if the waveform of the input voltage VAC from the AC power supply 6 is turned up and down.

  Here, when the output voltage of the second input side power supply circuit 22 is increased, the input voltage to the feedback terminal FB2 of the second control circuit 42 is increased, whereby the switching elements Q4 and Q5 of the second input side power supply circuit 22 are increased. The frequency of on / off driving is increased, and thereby the output voltage of the second input side power supply circuit 22 is decreased. That is, the second control circuit 42 performs feedback control so that the output voltage of the second input side power supply circuit 22 is substantially constant. The output voltage of the second input side power supply circuit 22 (that is, the voltage across the output capacitor C1) is a voltage obtained by boosting the effective value of the DC output voltage of the diode bridge 2b.

  The output side power supply circuit (hereinafter referred to as “second output side power supply circuit”) 32 of the second power supply device 12 is a kind of step-down converter, which is a so-called well-known buck converter. That is, the second output side power supply circuit 32 has a series circuit of an output capacitor C6, an inductor L4, a switching element Q6, and a current detection resistor R7 connected between the output terminals of the second input side power supply circuit 22, and an anode that is switched. The diode D4 is connected to the connection point between the element Q6 and the inductor L4, and the cathode is connected to the output terminal on the high voltage side of the second input side power supply circuit 22. In the second output side power supply circuit 32, both ends of the output capacitor C6 are output ends, and a light emitting diode 52 as an electric light source is connected between the output ends.

  In addition, the second power supply device 12 includes an operational amplifier OP1 that is input to the non-inverting input terminal by dividing the ground voltage at the output terminal on the high voltage side of the second output side power supply circuit 32 by the resistors Rf and Rg. . The output terminal on the low voltage side of the second output side power supply circuit 32 is connected to the inverting input terminal of the operational amplifier OP1 through the resistor Rh, and is connected to the output terminal through another resistor Ri.

  In the first control circuit 41 serving as an output side control circuit in the second power supply device 12, the feedback terminal FB1 is connected to the output terminal of the operational amplifier OP1. Further, the constant voltage Vd is input to the multiplication terminal MUL. The connection of the first control circuit 41 to the other terminals is the same as that of the first power supply device 11. That is, the output terminal OUT is connected to the gate of the switching element Q6, the zero-cross terminal ZCD is connected to the secondary winding of the inductor L4 via the resistor Rz, and the voltage across the current detection resistor R7 is a resistance at the current detection terminal CS. The signal is smoothed by Rb and capacitor Cb. That is, the relationship between the on / off state of the switching element Q6 in the second output side power supply circuit 32 and the waveform of the current flowing through the inductor L4 is the same as the on / off state of the switching element Q1 in the first input side power supply circuit 21 described in FIG. This is the same as the relationship with the waveform of the circuit current IL1. Further, the feedback control by the first control circuit 41 is such that the output voltage of the second output side power supply circuit 32 is substantially constant. As a result, the light emitting diode 52 is lit by being supplied with a substantially constant current.

  According to the above configuration, the first control circuit 41 and the second control circuit 42 are used for both the first power supply device 11 and the second power supply device 12, respectively. Due to the mass production effect with the control circuit 42, it is possible to reduce the manufacturing cost of the entire power supply system including the first power supply device 11 and the second power supply device 12.

  The first control circuit 41 and the second control circuit 42 may be integrated on a one-chip integrated circuit, and the number of parts can be reduced and the size can be reduced by integration.

  Further, even between parts having different signs in FIGS. 2 and 3, if many parts of the same type are used as much as possible, the manufacturing cost can be further reduced due to the mass production effect of the parts of that type.

(Embodiment 2)
As shown in FIGS. 8A and 8B, the first power supply device 11 and the second power supply device 12 in the present embodiment are boost converters similar to the first input-side power supply circuit 21 in the first embodiment, respectively. The circuit configuration is such that a buck converter similar to the second output side power supply circuit 32 is connected to the output end. That is, in each of the first power supply device 11 and the second power supply device 12, the first control circuit 41 is used for both the input side control circuit and the output side control circuit.

  Connection and operation to each terminal of the first control circuit 41 serving as the input side control circuit are the same as those in the first power supply apparatus 11 of the first embodiment, and each of the first control circuit 41 serving as the output side control circuit is the same. Since the connection to the terminal and the operation are the same as those in the second power supply device 12 of the first embodiment, illustration and description of common parts are omitted.

  Further, in the present embodiment, the connection position of the output capacitor C6 of the buck converter, the connection position of the diode bridge 2b, and the connection position of the feedback terminal FB1 and the multiplication terminal MUL in each control circuit 41 due to the symmetry of the circuit. Only by changing, the first power supply device 11 and the second power supply device 12 can be changed from each other. That is, as compared with the first embodiment, the number of common parts between the first power supply device 11 and the second power supply device 12 is larger, so that the manufacturing cost of the entire power supply system including the first power supply device 11 and the second power supply device 12 is increased. Can be further suppressed.

  More specifically, when the first power supply device 11 shown in FIG. 8A is changed to the second power supply device 12 shown in FIG. 8B, the output capacitor C6 is input by the first power supply device 11. The side power supply circuit 21 is connected in parallel to the series circuit of the inductor L1 and the diode D1. That is, in each of the first power supply circuit 11 and the second power supply circuit 12, one end of the output capacitor C6 serving as the output terminal on the high voltage side of the output side power supply circuits 31 and 32 is connected to the high side of the input side power supply circuits 21 and 22. It is connected to an external connection terminal electrically connected to one end of the output capacitor C1 which is one end of the voltage side output end. In the above change, the diode bridge 2b is connected between the one end connected to the output capacitor C6 and the ground in the inductor L4 constituting the output-side power circuit 31 in the first power supply device 11. The That is, in both the first power supply device 11 and the second power supply device 12, both ends of the center output capacitor C1 are output ends of the input side power supply circuits 21 and 22.

  8A, voltage dividing resistors R8 and R9 are connected between one end connected to the output capacitor C6 and the ground in the inductor L1 constituting the output side power supply circuit 31 of the first power supply device 11. ing. The output voltage of the diode bridge 2b is applied to the resistor R8 at the multiplication terminal MUL of the first control circuit 41 (on the right side in FIG. 8B) that serves as the input side control circuit in the second power supply device 12. , R9 are divided and input.

  Furthermore, the output terminal of the operational amplifier OP1 shown in FIG. 3 (not shown in FIGS. 8A and 8B) is the first control circuit 41 (that is, the right side in FIG. 8A) that is the output side control circuit. The first control circuit 41 is connected to the feedback terminal FB1 of the left first control circuit 41) in FIG. 8B.

  Here, in the present embodiment, in the first power supply device 11, the inductance of the inductor L <b> 4 that constitutes the output-side power supply circuit 31 is twice the inductance of the inductor L <b> 1 that constitutes the input-side power supply circuit 21. Further, the target value of the output voltage of the input side power supply circuits 21 and 22 is common to the first power supply device 11 and the second power supply device 12. As a result, when the 100V AC power supply 6 is connected to the first power supply device 11 and when the 200V AC power supply 6 is connected to the second power supply device 12, the switching elements Q1, The on / off frequency of Q6 can be substantially matched. Therefore, if the first power supply device 11 is connected to the 100V AC power supply 6 and the second power supply device 12 is connected to the 200V AC power supply 6, the switching element Q1 in the input-side power supply circuits 21 and 22 is assumed. , Q6 has an undesirable frequency such as, for example, a frequency exceeding 150 kHz or a frequency used by a general remote controller (not shown), when the AC power supply 6 is 100V and 200V. It is easy to avoid both.

  Also in this embodiment, if the two control circuits 41 are integrated in a one-chip integrated circuit, the number of parts can be reduced and the size can be reduced.

  As shown in FIGS. 9 and 10, the various power supply devices 11 and 12 can be housed in, for example, the case 70 and housed in the instrument main body 71 as shown by the arrow A <b> 1 to constitute the lighting device 7. . The appliance main body 71 holds an electric light source that is turned on by the output power of the power supply devices 11 and 12 such as the discharge lamp 51 and the light emitting diode 52.

  Further, in each of the first embodiment and the second embodiment, another solid light emitting element such as an organic EL may be used instead of the light emitting diode 52. As described above, when a light emitting diode 52 or a solid light emitting element such as an organic EL is used as an electric light source, power consumption per luminous flux can be reduced as compared with a case where an incandescent lamp is used as an electric light source.

7 Illumination device 11 First power supply device 12 Second power supply device 21, 22 Input side power supply circuit 31, 32 Output side power supply circuit 41 First control circuit (input side control circuit, output side control circuit)
42 Second control circuit (input side control circuit, output side control circuit)
51 Discharge lamp (electrical light source)
52 Light Emitting Diode (Electric Light Source, Solid State Light Emitting Element)
Q1-Q6 switching element

Claims (9)

A first power supply device and a second power supply device;
The first power supply device and the second power supply device are respectively
An input-side power supply circuit that converts the input power having at least one switching element into DC power of a predetermined voltage;
An input side control circuit for driving each switching element of the input side power supply circuit;
An output-side power supply circuit that has at least one switching element and converts the output of the input-side power supply circuit;
An output side control circuit for driving each switching element of the output side power supply circuit,
The circuit configuration of the input side control circuit in the first power supply device and the circuit configuration of the output side control circuit in the second power supply device are common to each other,
And a circuit configuration of the output-side control circuit in the first power supply device and a circuit configuration of the input-side control circuit in the second power supply device are common to each other.   2. The power supply system according to claim 1, wherein the output side control circuit in the first power supply device alternately turns on and off two switching elements connected in series with each other. In the first power supply device, the input-side power supply circuit has a boost converter, and the output-side power supply circuit has a half-bridge inverter,
3. The power supply system according to claim 2, wherein in the second power supply device, the input-side power supply circuit includes a step-up converter, and the output-side power supply circuit includes a step-down converter.   2. The power supply system according to claim 1, wherein in each of the first power supply device and the second power supply device, the input-side power supply circuit includes a boost converter, and the output-side power supply circuit includes a buck converter. .   5. The power supply system according to claim 4, further comprising an external connection terminal electrically connected to an output terminal on the high voltage side of the boost converter.   6. The power supply system according to claim 4, wherein an inductance of one inductor of the boost converter and the buck converter is twice that of the other inductor.   The input side control circuit and the output side control circuit are integrated in a one-chip integrated circuit in each of the first power supply device and the second power supply device. The power supply system according to any one of the above.   The power supply system according to any one of claims 1 to 7, wherein the power supply system is turned on by at least one of the first power supply device and the second power supply device, and output power of the first power supply device or the second power supply device. An illuminating device comprising an electrical light source.   The lighting device according to claim 8, further comprising a solid-state light emitting element as the electrical light source.

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