JP2013223358A - Switching power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switching power supply device capable of preventing a deviation from a harmonic regulation.SOLUTION: The switching power supply device 100 includes: a power factor improvement circuit 1 that converts an input AC voltage into a DC voltage; a DC-DC converter section 52 that boosts the converted DC voltage and supplies the voltage to a load; a malfunction detection circuit 6 that detects a malfunction in the power factor improvement circuit 1; and a stopping circuit 7 that stops the operation of the DC-DC converter section 52 when the malfunction detection circuit 6 detects a malfunction in the power factor improvement circuit 1.

Description

  The present invention relates to a switching power supply device, and more particularly to a switching power supply device using a power factor correction circuit for harmonics.

  As a countermeasure against harmonics of the switching power supply, an active clamp type power factor correction circuit (PFC circuit) that achieves high efficiency and high power factor is used. A control IC (Integrated Circuit) for controlling the power factor correction circuit is provided by each manufacturer.

  Here, when the smoothing circuit on the input side of the switching power supply device is a capacitor input type, the input current flows only during the period when the voltage after rectification is higher than the charging voltage of the input smoothing capacitor. There was a problem that the angle was narrow and the power factor was lowered. In order to solve this problem, a switching power supply device having a boost chopper circuit having a power factor correction function has been conventionally used.

  For example, Patent Document 1 discloses the following switching power supply device that employs such a configuration. That is, a PFC circuit that includes a switching element and converts an input AC voltage into a DC voltage by switching operation of the switching element, a DC-DC converter circuit that boosts the converted DC voltage and supplies the converted DC voltage to a load, and the switching A PFC control circuit that controls switching of elements, a PFC activation power supply circuit that activates the PFC control circuit by outputting a voltage to the PFC control circuit based on the input AC voltage, and the switching performed by the PFC control circuit A PFC auxiliary power supply circuit that outputs a voltage to the PFC control circuit after element switching control is started, and a voltage output of the PFC activation power supply circuit after a predetermined time has elapsed since the PFC auxiliary power supply circuit started voltage output Power supply device comprising a PFC start-up power supply stop circuit for stopping It is disclosed in Patent Document 1.

JP 2007-329996 A (released on December 20, 2007)

  In the switching power supply device of Patent Document 1, when the power factor correction circuit stops due to some failure, if the subsequent DC-DC converter circuit continues to operate, it deviates from the harmonic regulation. Currently, the harmonic regulation is voluntary, but it is desirable to comply with the harmonic regulation.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a switching power supply device capable of preventing deviation from harmonic regulation.

  In order to solve the above problems, a switching power supply device according to the present invention includes a first switching element, and a power factor correction circuit that converts an input AC voltage into a DC voltage by a switching operation of the first switching element; A switching power supply comprising: a DC-DC converter circuit that boosts the converted DC voltage and supplies the boosted DC voltage to a load; and a power factor correction control circuit that performs switching control of the first switching element. A malfunction detection unit that detects malfunction of the rate improvement circuit, and a stop unit that stops the operation of the DC-DC converter circuit when the malfunction detection unit detects a malfunction of the power factor correction circuit. Yes.

  According to said structure, when a malfunction detection part detects the malfunction of a power factor improvement circuit, a stop part stops operation | movement of a DC-DC converter circuit. Therefore, it is possible to prevent the harmonic regulation from deviating by continuing the operation of the DC-DC converter circuit in a state where the power factor correction circuit malfunctions. Therefore, it is possible to provide a switching power supply device that can prevent deviation from harmonic regulations.

  In the switching power supply according to the present invention, the malfunction detection unit detects the output voltage of the power factor correction control circuit after the switching control of the first switching element by the power factor correction control circuit is started. A malfunction detection circuit that detects malfunction of the power factor correction circuit based on the detected output voltage, and the stop unit detects malfunction of the power factor correction circuit. In this case, it is preferable to stop the voltage supply to the load of the DC-DC converter circuit.

  According to the above configuration, after the switching control of the first switching element by the power factor correction control circuit is started, the detection circuit detects the output voltage of the power factor correction control circuit. Here, when the power factor correction circuit malfunctions, the voltage detected by the detection circuit also changes. Thereby, the malfunction detection circuit can detect malfunction of the power factor correction circuit. Moreover, a stop part stops the voltage supply to the load of a DC-DC converter circuit, when a malfunction detection circuit detects the malfunction of a power factor improvement circuit. Thereby, the deviation | shift of a harmonic regulation can be prevented.

  In the switching power supply according to the present invention, the malfunction detection unit detects the output voltage of the power factor correction control circuit after the switching control of the first switching element by the power factor correction control circuit is started. A malfunction detection circuit that detects malfunction of the power factor correction circuit based on the detected output voltage, and the stop unit detects malfunction of the power factor correction circuit. In this case, it is preferable to stop the supply of the DC voltage from the power factor correction circuit to the DC-DC converter circuit.

  According to the above configuration, after the switching control of the first switching element by the power factor correction control circuit is started, the detection circuit detects the output voltage of the power factor correction control circuit. Here, when the power factor correction circuit malfunctions, the voltage detected by the detection circuit also changes. Thereby, the malfunction detection circuit can detect malfunction of the power factor correction circuit. Further, when the malfunction detection circuit detects a malfunction of the power factor correction circuit, the stop unit stops the supply of DC voltage from the power factor correction circuit to the DC-DC converter circuit. As a result, the operation of the DC-DC converter circuit can be stopped and the deviation from the harmonic regulation can be prevented.

  In the switching power supply according to the present invention, the malfunction detection unit detects an alternating current input to the power factor correction circuit after the switching control of the first switching element by the power factor correction control circuit is started. A detection unit; and a malfunction detection circuit that detects malfunction of the power factor correction circuit based on the detected input AC current, and the stop unit detects malfunction of the power factor correction circuit. When detected, it is preferable to stop the voltage supply to the load of the DC-DC converter circuit.

  According to said structure, after switching control of the 1st switching element by a power factor improvement control circuit is started, a detection part detects the input alternating current to a power factor improvement circuit. Here, when the power factor correction circuit malfunctions, the input alternating current waveform detected by the detection unit changes. Thereby, the malfunction detection circuit can detect malfunction of the power factor correction circuit. Moreover, a stop part stops the voltage supply to the load of a DC-DC converter circuit, when a malfunction detection circuit detects the malfunction of a power factor improvement circuit. Thereby, the deviation | shift of a harmonic regulation can be prevented.

  In the switching power supply according to the present invention, the malfunction detection unit detects an alternating current input to the power factor correction circuit after the switching control of the first switching element by the power factor correction control circuit is started. A detection unit; and a malfunction detection circuit that detects malfunction of the power factor correction circuit based on the detected input AC current, and the stop unit detects malfunction of the power factor correction circuit. When detected, it is preferable to stop the supply of the DC voltage from the power factor correction circuit to the DC-DC converter circuit.

  According to said structure, after switching control of the 1st switching element by a power factor improvement control circuit is started, a detection part detects the input alternating current to a power factor improvement circuit. Here, when the power factor correction circuit malfunctions, the input alternating current waveform detected by the detection unit changes. Thereby, the malfunction detection circuit can detect malfunction of the power factor correction circuit. Further, when the malfunction detection circuit detects a malfunction of the power factor correction circuit, the stop unit stops the supply of DC voltage from the power factor correction circuit to the DC-DC converter circuit. As a result, the operation of the DC-DC converter circuit can be stopped and the deviation from the harmonic regulation can be prevented.

  In the switching power supply according to the present invention, the DC-DC converter circuit includes a transformer, a second switching element connected to the primary winding of the transformer, and a switching operation of the second switching element. A primary side control circuit for controlling, and boosting the converted DC voltage by a switching operation of the second switching element, and the stop unit includes the malfunction detection circuit and the power factor correction circuit. It is preferable to stop the switching operation of the second switching element in the primary side control circuit when a malfunction is detected.

  According to the above configuration, the stop unit causes the primary side control circuit to stop the switching operation of the second switching element when the malfunction detection circuit detects the malfunction of the power factor correction circuit. Thereby, the voltage supply to the load of the DC-DC converter circuit can be stopped, so that deviation from the harmonic regulation can be prevented.

  In the switching power supply according to the present invention, the stopping unit includes a switch provided between the power factor correction circuit and the DC-DC converter circuit, and the malfunction detection circuit detects a malfunction of the power factor correction circuit. In this case, it is preferable to provide a stop circuit that brings the switch into a non-conductive state.

  According to the above configuration, when the malfunction detection circuit detects the malfunction of the power factor correction circuit, the stop circuit turns off the switch provided between the power factor correction circuit and the DC-DC converter circuit. As a result, the supply of the DC voltage from the power factor correction circuit to the DC-DC converter circuit can be stopped, so that deviation from the harmonic regulation can be prevented.

  In order to solve the above problems, a switching power supply device according to the present invention includes a switching element, a power factor correction circuit that converts an input AC voltage into a DC voltage by a switching operation of the switching element, and the converted DC current A switching power supply device comprising: a DC-DC converter circuit that boosts a voltage and supplies it to a load; and a power factor correction control circuit that performs switching control of the switching element, wherein the malfunction detects the malfunction of the power factor correction circuit When the malfunction detection part detects a malfunction of the power factor correction circuit, it includes a warning generation part that issues a warning.

  According to the above configuration, when the malfunction detection unit detects a malfunction of the power factor correction circuit, the warning generation unit issues a warning to notify the user that the power factor correction circuit 1 is malfunctioning. As a result, the user can stop the operation of the DC-DC converter circuit by a method such as shutting off the power supply to the switching power supply device, so that the DC-DC converter circuit can be operated in a state where the power factor correction circuit malfunctions. By continuing to operate, it is possible to prevent deviation from the harmonic regulation. Therefore, it is possible to provide a switching power supply device that can prevent deviation from harmonic regulations.

  In the switching power supply according to the present invention, the malfunction detection unit detects a voltage output from the power factor correction control circuit after the switching control of the switching element by the power factor correction control circuit is started, A malfunction detection circuit that detects malfunction of the power factor correction circuit based on the detected output voltage, and the warning generator, when the malfunction detection circuit detects malfunction of the power factor correction circuit, It is preferable to issue a warning.

  According to the above configuration, after the switching control of the switching element by the power factor correction control circuit is started, the detection circuit detects the output voltage of the power factor correction control circuit. Here, when the power factor correction circuit malfunctions, the voltage detected by the detection circuit also changes. Thereby, the malfunction detection circuit can detect malfunction of the power factor correction circuit.

  In the switching power supply device according to the present invention, the malfunction detection unit includes a detection unit that detects an alternating current input to the power factor correction circuit after the switching control of the switching element by the power factor correction control circuit is started. A malfunction detection circuit that detects a malfunction of the power factor correction circuit based on the detected input AC current, and the warning generator detects the malfunction of the power factor correction circuit. If this is the case, it is preferable to issue a warning.

  According to said structure, after switching control of the switching element by a power factor improvement control circuit is started, a detection part detects the input alternating current to a power factor improvement circuit. Here, when the power factor correction circuit malfunctions, the input alternating current waveform detected by the detection unit changes. Thereby, the malfunction detection circuit can detect malfunction of the power factor correction circuit.

  In order to solve the above problems, a switching power supply device according to the present invention includes a switching element, a power factor correction circuit that converts an input AC voltage into a DC voltage by a switching operation of the switching element, and the converted DC current A switching power supply device comprising: a DC-DC converter circuit that boosts a voltage and supplies it to a load; and a power factor correction control circuit that performs switching control of the switching element, wherein the malfunction detects the malfunction of the power factor correction circuit When the detection unit and the malfunction detection unit detect a malfunction of the power factor correction circuit, a stop unit that stops the operation of the DC-DC converter circuit, and the malfunction detection unit detects a malfunction of the power factor correction circuit. In this case, a warning generation unit that issues a warning is provided.

  According to said structure, when a malfunction detection part detects the malfunction of a power factor improvement circuit, while a stop part stops operation | movement of a DC-DC converter circuit, a warning generation part issues a warning. Therefore, it is possible to prevent the harmonic regulation from deviating by continuing the operation of the DC-DC converter circuit in a state where the power factor correction circuit malfunctions. Therefore, it is possible to provide a switching power supply device that can prevent deviation from harmonic regulations.

  As described above, the switching power supply apparatus according to the present invention includes the first switching element, the power factor improving circuit that converts the input AC voltage into the DC voltage by the switching operation of the first switching element, and the converted power supply device. A switching power supply device comprising: a DC-DC converter circuit that boosts a direct-current voltage to supply to a load; and a power factor correction control circuit that performs switching control of the first switching element, wherein the power factor correction circuit includes: A malfunction detection unit that detects a malfunction and a stop unit that stops the operation of the DC-DC converter circuit when the malfunction detection unit detects a malfunction of the power factor correction circuit.

  Also, the switching power supply according to the present invention is a switching power supply according to the present invention, including a switching element, and a power factor improving circuit that converts an input AC voltage into a DC voltage by a switching operation of the switching element, and the converted power supply. A switching power supply device comprising: a DC-DC converter circuit that boosts a DC voltage that is supplied to a load and a power factor correction control circuit that performs switching control of the switching element, and detects a malfunction of the power factor correction circuit And a warning generation unit that issues a warning when the malfunction detection unit detects a malfunction of the power factor correction circuit.

  Therefore, there is an effect that it is possible to provide a switching power supply device that can prevent deviation of harmonic regulation.

1 is a circuit diagram showing a configuration of a switching power supply device according to a first embodiment of the present invention. It is a circuit diagram which shows the structure of the switching power supply device which concerns on the 2nd Embodiment of this invention. It is a circuit diagram which shows the structure of the switching power supply device which concerns on the 3rd Embodiment of this invention. It is a circuit diagram which shows the structure of the switching power supply device which concerns on the 4th Embodiment of this invention. It is a wave form chart of the input current waveform to a power factor improvement circuit, (a) shows a waveform at the time of normal operation of a power factor improvement circuit, and (b) shows a waveform at the time of malfunction of a power factor improvement circuit. Show. It is a circuit diagram which shows the structure of the switching power supply device which concerns on the 5th Embodiment of this invention. It is a circuit diagram which shows the structure of the switching power supply device which concerns on the 6th Embodiment of this invention. It is a circuit diagram which shows the structure of the switching power supply device which concerns on the 7th Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<First Embodiment>
The following describes the first embodiment of the present invention with reference to FIG.

(Configuration of switching power supply apparatus 100)
FIG. 1 is a circuit diagram showing a configuration of a switching power supply apparatus 100 according to the present embodiment. The switching power supply apparatus 100 includes a power factor improving unit 51, a DC-DC converter unit (DC-DC converter circuit) 52, input terminals TIN1 and TIN2, and output terminals TOUT1 and TOUT2. The power factor improving unit 51 includes a bridge diode BD1, a capacitor C1, a power factor improving circuit 1, a power factor improving starting power supply circuit 2, a power factor improving control circuit 3, and a first detection circuit 4. The DC-DC converter unit 52 includes a DC-DC auxiliary power circuit 11, a voltage detection circuit 12, a primary side control circuit 13, a primary-secondary transmission circuit 14, a transformer T1, a transistor (second circuit). Switching element) Q4, capacitor C6, and diode D2.

  The power factor correction circuit 1 includes a transistor (switching element, first switching element) Q1, a choke coil L1, a diode D1, and a capacitor C2. The coil (auxiliary winding) L2 constitutes a power factor improving auxiliary power circuit. The power factor correction control circuit 3 performs switching control of the transistor Q1. The power factor correction start-up power supply circuit 2 starts the power factor correction control circuit 3 by outputting a voltage to the power factor correction control circuit 3 based on the input AC voltage. The first detection circuit 4 includes resistors R1 and R2. For example, the transistors Q1 and Q2 are MOSFETs.

  The configuration of the power factor improvement unit 51 will be described in more detail. Input terminals TIN1 and TIN2 are connected to corresponding input terminals of bridge diode BD1, respectively. One output terminal of the bridge diode BD1, one end of the capacitor C1, and one end of the choke coil L1 are connected. The other end of the choke coil L1, the anode of the diode D1, and the drain of the transistor Q1 are connected. The gate of the transistor Q1 is connected to the output of the power factor correction control circuit 3. The cathode of the diode D1, the positive electrode of the capacitor C2, and one end of the resistor R1 are connected to each other. The other end of the resistor R1, one end of the resistor R2, and the input of the power factor correction control circuit 3 are connected. That is, the voltage detection result of the first detection circuit is output to the power factor correction control circuit 3.

  Next, the configuration of the DC-DC converter unit 52 will be described in more detail. The transistor Q4 has a drain connected to the other end of the winding L11 and a gate connected to the output of the primary side control circuit 13. The DC-DC auxiliary power supply circuit 11 has an input connected to one end of the winding L <b> 13 and an output connected to the input of the primary side control circuit 13. The anode of the diode D2 is connected to one end of the winding L12, and the cathode is connected to the positive electrode of the capacitor C6, the input of the voltage detection circuit 12, and the output terminal TOUT1. The negative electrode of capacitor C6, the other end of winding L12, and output terminal TOUT2 are connected. The voltage detection result of the voltage detection circuit 12 is output to the primary side control circuit 13 via the primary-secondary transmission circuit 14.

  Thus, the DC-DC converter unit 52 includes the transformer T1, the transistor Q4 connected to the primary winding L11 of the transformer T1, and the primary side control circuit 13 that controls the switching operation of the transistor Q4. The DC voltage from the power factor correction circuit 1 is boosted by the switching operation of the transistor Q4.

  The other output terminal of the bridge diode BD1, the other end of the capacitor C1, the other end of the coil L2, the source of the transistor Q1, the negative electrode of the capacitor C2, the other end of the resistor R2, and the source of the transistor Q4; The other end of the winding L13 is connected to a common connection point.

  The power factor correction starting power supply circuit 2 outputs a voltage to the power factor correction control circuit 3 based on the input AC voltage, and starts the power factor correction control circuit 3. More specifically, the AC voltage supplied from the outside to the input terminals TIN1 and TIN2 is full-wave rectified by the bridge diode BD1. The voltage output from the bridge diode BD1 is rectified and smoothed by the choke coil L1, the diode D1, and the capacitor C2, and becomes a DC voltage.

  When power is supplied from the power factor correction start-up power supply circuit 2, the power factor correction control circuit 3 applies a control voltage to the base of the transistor Q1 in the power factor correction circuit 1 based on the voltage detection result of the first detection circuit 4. Is output to perform switching control of the transistor Q1. More specifically, the power factor correction control circuit 3 performs switching between the ON state and the OFF state of the transistor Q1, boosts the voltage that has been full-wave rectified by the bridge diode BD1, and converts it into a DC voltage. Output to the DC converter 52. Here, the DC voltage boosted by the power factor correction control circuit 3 has a higher voltage value than the AC voltage input from the outside. The power factor correction control circuit 3 switches the transistor Q1 between the on state and the off state so that the voltage value detected by the first detection circuit 4 is constant.

  The DC-DC converter unit 52 boosts the DC voltage received from the power factor correction circuit 1 and outputs the boosted voltage to the outside.

  More specifically, a voltage is induced in the coil (auxiliary winding) L2 magnetically coupled to the choke coil L1 by the switching operation of the transistor Q1. The voltage induced in the coil L2 is supplied to the power factor correction control circuit 3.

(Prevention of deviation from harmonic regulations)
The above configuration of the switching power supply apparatus 100 is an existing circuit configuration included in the conventional switching power supply apparatus described in Patent Document 1. Here, when the power factor correction circuit 1 stops due to some failure, if the subsequent DC-DC converter unit 52 continues to operate, it deviates from the harmonic regulation.

  Therefore, the switching power supply device 100 according to the present embodiment includes a second detection circuit (malfunction detection unit, detection circuit) 5, a malfunction detection circuit (malfunction detection unit) 6, and a stop circuit (stop unit) 7. It has more. Second detection circuit 5 includes resistors R3 and R4. One end of the resistor R3 is connected to the cathode of the diode D1, the positive electrode of the capacitor C2, and one end of the resistor R1. The other end of the resistor R3 is connected to one end of the resistor R4 and the input of the malfunction detection circuit 6, and the other end of the resistor R4 is connected to a common connection point to which the source and the like of the transistor Q1 are connected.

  The voltage detected by the second detection circuit 5 is input to the malfunction detection circuit 6. The malfunction detection circuit 6 is connected to the stop circuit 7, and the stop circuit 7 is further connected to the primary side control circuit 13.

  In the above configuration, when the power factor correction circuit 1 malfunctions, the voltage of the capacitor C2 differs from a predetermined value, so that the voltage detected by the second detection circuit 5 also changes. Accordingly, the malfunction detection circuit 6 determines that the power factor correction circuit 1 has malfunctioned, and inputs information indicating malfunction of the power factor correction circuit 1 to the stop circuit 7.

  When the stop circuit 7 receives information indicating a malfunction of the power factor correction circuit 1, the stop circuit 7 causes the primary side control circuit 13 to stop the switching operation of the transistor Q4. As a result, the operation of the DC-DC converter unit 52 is stopped, and the supply of voltage to the loads connected to the output terminals TOUT1 and TOUT2 is stopped.

  As described above, the switching power supply device 100 is configured to stop the operation of the DC-DC converter unit 52 when the power factor correction circuit 1 malfunctions. be able to.

  In the switching power supply device 100, the voltage supply to the load of the DC-DC converter unit 52 is stopped by stopping the switching operation of the transistor Q4. However, the voltage supply to the load of the DC-DC converter unit 52 is stopped. The method of stopping is not limited to this.

  Further, in the switching power supply device 100, the output voltage of the power factor correction circuit 1 is detected by the second detection circuit 5 in order to determine the malfunction of the power factor correction circuit 1, but the first detection circuit 4 The function of the second detection circuit 5 may also be provided. In this case, instead of providing the second detection circuit 5, the connection point between the resistor R1 and the resistor R2 in the first detection circuit 4 is not only the input of the power factor correction control circuit 3, but also the malfunction detection circuit 6 Connect to the input. Thereby, the malfunction detection circuit 6 can detect malfunction of the power factor correction circuit 1 based on the voltage detected by the first detection circuit 4.

<Second Embodiment>
The following describes the second embodiment of the present invention with reference to FIG. The present embodiment relates to a switching power supply apparatus 200 whose configuration is changed as compared with the switching power supply apparatus 100 according to the first embodiment.

(Configuration of switching power supply device 200)
FIG. 2 is a circuit diagram showing a configuration of switching power supply apparatus 200 according to the present embodiment. The switching power supply device 200 includes a power factor correction unit 51, a DC-DC converter unit 52, input terminals TIN1 and TIN2, output terminals TOUT1 and TOUT2, a second detection circuit 5, a malfunction detection circuit 6, and a stop. A circuit (stop unit) 17 and a switch SW1 are provided. That is, the switching power supply apparatus 200 has a configuration in which the stop circuit 7 is replaced with the stop circuit 17 and the switch SW1 in the switching power supply apparatus 100 according to the first embodiment.

  The switch SW1 is provided between the power factor correction circuit 1 and the DC-DC converter unit 52. By controlling the conduction / non-conduction of the switch SW1, it is possible to control ON / OFF of the supply of the DC voltage from the power factor correction circuit 1 to the DC-DC converter unit 52.

  The stop circuit 17 is a circuit that controls conduction / non-conduction of the switch SW1. The input of the stop circuit 17 is connected to the output of the malfunction detection circuit 6. When the power factor correction circuit 1 is operating normally, the stop circuit 17 controls the switch SW1 to be in a conductive state.

(Prevention of deviation from harmonic regulations)
On the other hand, when the power factor correction circuit 1 malfunctions, the voltage detected by the second detection circuit 5 changes, and the malfunction detection circuit 6 determines that the power factor correction circuit 1 malfunctions. Information indicating a malfunction is input to the stop circuit 17. When the stop circuit 17 receives the information indicating the malfunction of the power factor correction circuit 1, the stop circuit 17 switches the switch SW1 to the non-conductive state. Thereby, the supply of the DC voltage from the power factor correction circuit 1 to the DC-DC converter unit 52 is cut off, and the DC-DC converter unit 52 stops its operation.

  As described above, the switching power supply device 200 is configured to stop the operation of the DC-DC converter unit 52 when the power factor correction circuit 1 malfunctions, as with the switching power supply device 100 according to the first embodiment. Therefore, it is possible to prevent deviation from the harmonic regulation.

<Third Embodiment>
The following describes the third embodiment of the present invention with reference to FIG. The present embodiment relates to a switching power supply apparatus 300 whose configuration is changed as compared with the switching power supply apparatus 100 according to the first embodiment.

(Configuration of switching power supply apparatus 300)
FIG. 3 is a circuit diagram showing a configuration of switching power supply apparatus 300 according to the present embodiment. The switching power supply device 300 includes a power factor correction unit 51, a DC-DC converter unit 52, input terminals TIN1 and TIN2, output terminals TOUT1 and TOUT2, a second detection circuit 5, a malfunction detection circuit 6, and a warning. And a generation circuit (warning generation unit) 8. That is, the switching power supply apparatus 200 has a configuration in which the stop circuit 7 is replaced with the warning generation circuit 8 in the switching power supply apparatus 100 according to the first embodiment.

  The warning generation circuit 8 is connected to a notification means such as a speaker or a lamp. The input of the warning generation circuit 8 is connected to the output of the malfunction detection circuit 6.

(Prevention of deviation from harmonic regulations)
When the power factor correction circuit 1 malfunctions, the voltage detected by the second detection circuit 5 changes. Therefore, the malfunction detection circuit 6 determines that the power factor correction circuit 1 malfunctions, and the power factor correction circuit 1 malfunctions. Is input to the warning generation circuit 8. When the warning generation circuit 8 receives the information indicating the malfunction of the power factor correction circuit 1, the warning generation circuit 8 operates the notification means to warn the user that the power factor correction circuit 1 is malfunctioning. The user can stop the operation of the DC-DC converter unit 52 by, for example, disconnecting an AC outlet that supplies power to the switching power supply device 300.

  As described above, the switching power supply apparatus 300 is configured to warn the user when the power factor correction circuit 1 malfunctions, so that it can be prevented from deviating from the harmonic regulation.

<Fourth embodiment>
The following describes the fourth embodiment of the present invention with reference to FIG. 4 and FIG. The present embodiment relates to a switching power supply device 400 whose configuration is changed as compared to the switching power supply device 100 according to the first embodiment.

(Configuration of switching power supply device 400)
FIG. 4 is a circuit diagram showing a configuration of switching power supply apparatus 400 according to the present embodiment. The switching power supply device 400 includes a power factor correction unit 51, a DC-DC converter unit 52, input terminals TIN1 and TIN2, output terminals TOUT1 and TOUT2, a second detection circuit 5, a stop circuit 7, and a coil L3. L4 and a malfunction detection circuit (malfunction detection unit) 16. That is, in the switching power supply apparatus 400 according to the first embodiment, the switching power supply apparatus 400 omits the second detection circuit 5, replaces the malfunction detection circuit 6 with the malfunction detection circuit 16, and further replaces the coils L3 and L4. This is a configuration provided.

  The coil L3 is provided between the input terminal TIN2 and the corresponding input terminal of the bridge diode BD1. The coil L4 is magnetically coupled to the coil L3 and is connected to the malfunction detection circuit 16. Thereby, the coils L3 and L4 detect the input current waveforms of the input terminals TIN1 and TIN2. The malfunction detection circuit 16 detects malfunction of the power factor correction circuit 1 based on the input current waveform detected by the coils L3 and L4.

  5A and 5B are waveform diagrams of input current waveforms of the input terminals TIN1 and TIN2. FIG. 5A shows a waveform during normal operation of the power factor correction circuit 1, and FIG. The waveform at the time of malfunction is shown.

  As shown in FIG. 5A, during the normal operation of the power factor correction circuit 1, when the absolute value of the input voltage is greater than or equal to a predetermined value, the input current gradually changes according to the input voltage. Also, the frequency characteristic of the current is below the standard value indicated by the broken line.

  On the other hand, as shown in FIG. 5B, when the power factor correction circuit 1 malfunctions, the change of the input current with respect to the input voltage becomes sharper than when the power factor correction circuit 1 operates normally. Further, the frequency characteristic of the current also exceeds the standard value indicated by the broken line.

(Prevention of deviation from harmonic regulations)
The malfunction detection circuit 16 detects malfunction of the power factor correction circuit 1 based on the above characteristics of the input current waveform with respect to the operating state of the power factor correction circuit 1. That is, when the power factor correction circuit 1 malfunctions and the input current waveform becomes as shown in FIG. 5B, the malfunction detection circuit 16 determines that the power factor correction circuit 1 is malfunctioning. Then, information indicating a malfunction of the power factor correction circuit 1 is input to the stop circuit 7.

  When the stop circuit 7 receives information indicating a malfunction of the power factor correction circuit 1, the stop circuit 7 causes the primary side control circuit 13 to stop the switching operation of the transistor Q4. As a result, the operation of the DC-DC converter unit 52 is stopped, and the supply of the output voltage to the output terminals TOUT1 and TOUT2 is stopped.

  As described above, the switching power supply device 400 is configured to stop the operation of the DC-DC converter unit 52 when the power factor correction circuit 1 malfunctions, like the switching power supply device 100 according to the first embodiment. Therefore, it is possible to prevent deviation from the harmonic regulation.

<Fifth embodiment>
The following describes the fifth embodiment of the present invention with reference to FIG. The present embodiment relates to a switching power supply device 500 whose configuration is changed as compared with the switching power supply device 400 according to the fourth embodiment.

(Configuration of switching power supply device 500)
FIG. 6 is a circuit diagram showing a configuration of switching power supply device 500 according to the present embodiment. The switching power supply device 500 includes a power factor correction unit 51, a DC-DC converter unit 52, input terminals TIN1 and TIN2, output terminals TOUT1 and TOUT2, coils L3 and L4, malfunction detection circuit 16, and stop circuit 17. And a switch SW1. That is, the switching power supply device 500 has a configuration in which the stop circuit 7 is replaced with the stop circuit 17 and the switch SW1 in the switching power supply device 400 according to the fourth embodiment.

  The switch SW1 and the stop circuit 17 are the same as the switch SW1 and the stop circuit 17 shown in FIG. When the power factor correction circuit 1 is operating normally, that is, when the input current waveforms at the input terminals TIN1 and TIN2 are as shown in FIG. 5A, the stop circuit 17 is connected to the switch SW1. Control to be in a state.

(Prevention of deviation from harmonic regulations)
On the other hand, when the power factor correction circuit 1 malfunctions and the input current waveforms of the input terminals TIN1 and TIN2 become waveforms as shown in FIG. 5B, the malfunction detection circuit 16 causes the power factor correction circuit 1 to malfunction. Information indicating malfunction of the power factor correction circuit 1 is input to the stop circuit 17. When the stop circuit 17 receives the information indicating the malfunction of the power factor correction circuit 1, the stop circuit 17 switches the switch SW1 to the non-conductive state. Thereby, the supply of the DC voltage from the power factor correction circuit 1 to the DC-DC converter unit 52 is cut off, and the DC-DC converter unit 52 stops its operation.

  As described above, the switching power supply device 500 is configured to stop the operation of the DC-DC converter unit 52 when the power factor correction circuit 1 malfunctions, like the switching power supply device 400 according to the fourth embodiment. Therefore, it is possible to prevent deviation from the harmonic regulation.

<Sixth Embodiment>
The following describes the sixth embodiment of the present invention with reference to FIG. The present embodiment relates to a switching power supply 600 in which the configuration is changed as compared to the switching power supply 400 according to the fourth embodiment.

(Configuration of switching power supply device 600)
FIG. 7 is a circuit diagram showing a configuration of switching power supply apparatus 600 according to the present embodiment. Switching power supply device 600 includes power factor improving unit 51, DC-DC converter unit 52, input terminals TIN1 and TIN2, output terminals TOUT1 and TOUT2, coils L3 and L4, malfunction detection circuit 16, and warning generation circuit. 8. That is, the switching power supply device 600 has a configuration in which the stop circuit 7 is replaced with the warning generation circuit 8 in the switching power supply device 400 according to the fourth embodiment.

  The warning generation circuit 8 is connected to a notification means such as a speaker or a lamp. The input of the warning generation circuit 8 is connected to the output of the malfunction detection circuit 16.

(Prevention of deviation from harmonic regulations)
When the power factor correction circuit 1 malfunctions and the input current waveforms at the input terminals TIN1 and TIN2 become waveforms as shown in FIG. 5B, the malfunction detection circuit 16 indicates that the power factor correction circuit 1 malfunctions. The information indicating the malfunction of the power factor correction circuit 1 is input to the stop circuit 17. When the warning generation circuit 8 receives the information indicating the malfunction of the power factor correction circuit 1, the warning generation circuit 8 operates the notification means to warn the user that the power factor correction circuit 1 is malfunctioning. For example, the user can stop the operation of the DC-DC converter unit 52 by unplugging the AC outlet.

  As described above, since the switching power supply apparatus 600 is configured to warn the user when the power factor correction circuit 1 malfunctions, it can prevent the deviation from the harmonic regulation.

<Seventh embodiment>
The following describes the seventh embodiment of the present invention with reference to FIG.

(Configuration of switching power supply 700)
FIG. 8 is a circuit diagram showing a configuration of switching power supply apparatus 700 according to the present embodiment. Switching power supply device 700 includes power factor correction unit 51, DC-DC converter unit 52, input terminals TIN1 and TIN2, output terminals TOUT1 and TOUT2, coils L3 and L4, second detection circuit 5, and malfunction. A detection circuit (malfunction detection unit) 26, a stop circuit (stop unit) 27, and a warning generation circuit 8 are provided. The configuration other than the malfunction detection circuit 26 and the stop circuit 27 is the same as that in the first to sixth embodiments.

  The malfunction detection circuit 26 has both the functions of the malfunction detection circuit 6 shown in FIGS. 1 to 3 and the function of the malfunction detection circuit 16 shown in FIGS. 4, 6 and 7. That is, the malfunction detection circuit 26 can detect malfunction of the power factor correction circuit 1 based on both the voltage detected by the second detection circuit 5 and the input current waveforms of the input terminals TIN1 and TIN2. . More specifically, when the voltage detected by the second detection circuit 5 changes by more than a predetermined value, and when the input current waveforms at the input terminals TIN1 and TIN2 become waveforms as shown in FIG. In at least one of the cases, the malfunction detection circuit 26 determines that the power factor correction circuit 1 is malfunctioning, and inputs information indicating malfunction of the power factor correction circuit 1 to the stop circuit 27. Thereby, the malfunction detection circuit 26 can detect the malfunction of the power factor correction circuit 1 more reliably than the malfunction detection circuit 6 and the malfunction detection circuit 16.

  The stop circuit 27 has both the function of the stop circuit 7 shown in FIGS. 1 and 4 and the function of the stop circuit 17 shown in FIGS. 2 and 6. That is, when the stop circuit 27 receives information indicating a malfunction of the power factor correction circuit 1, the stop circuit 27 causes the primary side control circuit 13 to stop switching the transistor Q4 and switches the switch SW1 to a non-conductive state. Thus, when the power factor correction circuit 1 malfunctions, the stop circuit 27 can stop the operation of the DC-DC converter unit 52 more reliably than the stop circuit 7 and the stop circuit 17.

  As described above, the switching power supply device 700 is configured to stop the operation of the DC-DC converter unit 52 when the power factor correction circuit 1 malfunctions. be able to.

<Additional notes>
In the embodiment described above, when a malfunction of the power factor correction circuit is detected, the voltage supply to the load of the DC-DC converter circuit is stopped or the DC voltage from the power factor correction circuit to the DC-DC converter circuit is stopped. However, the specific method for stopping the operation of the DC-DC converter circuit is not limited to these, and any known method is used. be able to.

  Also, a specific method for warning the user of malfunction of the power factor correction circuit is not limited to the method described in the above-described embodiment, and any known method can be used.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  The present invention can also be expressed as follows.

  A switching power supply apparatus according to the present invention includes a switching element, a power factor correction circuit that converts an input AC voltage into a DC voltage by a switching operation of the switching element, and boosts the converted DC voltage and supplies it to a load. A DC-DC converter circuit; a power factor correction control circuit that performs switching control of the switching element; and a voltage output to the power factor correction control circuit based on the input AC voltage. A power factor correction start-up power supply circuit to be started; a circuit for detecting an output voltage of the power factor correction circuit after switching control of the switching element by the power factor correction control circuit is started; and the DC-DC converter circuit power supply A switching power supply device including a stop circuit that stops voltage output of the circuit.

  A switching power supply apparatus according to the present invention includes a switching element, a power factor correction circuit that converts an input AC voltage into a DC voltage by a switching operation of the switching element, and boosts the converted DC voltage and supplies it to a load. A DC-DC converter circuit; a power factor correction control circuit that performs switching control of the switching element; and a voltage output to the power factor correction control circuit based on the input AC voltage. Switching comprising: a power factor improvement starting power supply circuit to be started; a circuit for detecting an output voltage of the power factor improvement circuit after switching control of the switching element by the power factor improvement control circuit is started; and a warning generation circuit It is a power supply device.

  A switching power supply apparatus according to the present invention includes a switching element, a power factor correction circuit that converts an input AC voltage into a DC voltage by a switching operation of the switching element, and boosts the converted DC voltage and supplies it to a load. A DC-DC converter circuit; a power factor correction control circuit that performs switching control of the switching element; and a voltage output to the power factor correction control circuit based on the input AC voltage. A power factor correction start-up power supply circuit to be started; a circuit for detecting an output voltage of the power factor correction circuit after switching control of the switching element by the power factor correction control circuit is started; and the DC-DC converter circuit power supply A stop circuit for stopping the voltage output of the circuit, and supply of power to the DC-DC converter circuit power supply circuit It is a switching power supply apparatus comprising a switch for disconnection.

  A switching power supply apparatus according to the present invention includes a switching element, a power factor correction circuit that converts an input AC voltage into a DC voltage by a switching operation of the switching element, and boosts the converted DC voltage and supplies it to a load. A DC-DC converter circuit; a power factor correction control circuit that performs switching control of the switching element; and a voltage output to the power factor correction control circuit based on the input AC voltage. A power factor correction start-up power supply circuit to be started, a circuit for detecting a malfunction of the power factor correction circuit after the switching control of the switching element by the power factor correction control circuit is started, and the DC-DC converter circuit power supply A switching power supply device including a stop circuit that stops voltage output of the circuit.

  A switching power supply apparatus according to the present invention includes a switching element, a power factor correction circuit that converts an input AC voltage into a DC voltage by a switching operation of the switching element, and boosts the converted DC voltage and supplies it to a load. A DC-DC converter circuit; a power factor correction control circuit that performs switching control of the switching element; and a voltage output to the power factor correction control circuit based on the input AC voltage. Switching comprising: a power factor improvement starting power supply circuit to be started; a circuit for detecting non-operation of the power factor improvement circuit after switching control of the switching element by the power factor improvement control circuit is started; and a warning generation circuit It is a power supply device.

  A switching power supply apparatus according to the present invention includes a switching element, a power factor correction circuit that converts an input AC voltage into a DC voltage by a switching operation of the switching element, and boosts the converted DC voltage and supplies it to a load. A DC-DC converter circuit; a power factor correction control circuit that performs switching control of the switching element; and a voltage output to the power factor correction control circuit based on the input AC voltage. A power factor correction start-up power supply circuit to be started, a circuit for detecting a malfunction of the power factor correction circuit after the switching control of the switching element by the power factor correction control circuit is started, and the DC-DC converter circuit power supply A stop circuit for stopping the voltage output of the circuit and the power supply to the DC-DC converter circuit power supply circuit. It is a switching power supply apparatus comprising a switch for.

  The present invention is particularly suitable for a switching power supply device using a power factor correction circuit that supports harmonics.

DESCRIPTION OF SYMBOLS 1 Power factor improvement circuit 2 Power factor improvement starting power supply circuit 3 Power factor improvement control circuit 4 1st detection circuit 5 2nd detection circuit (malfunction detection part, detection circuit)
6 Malfunction detection circuit (Malfunction detection unit)
7 Stop circuit (stop part)
8 Warning generation circuit (Warning generator)
11 DC-DC auxiliary power circuit 12 Voltage detection circuit 13 Primary side control circuit 14 Primary-secondary transmission circuit 16 Malfunction detection circuit (malfunction detection unit)
17 Stop circuit (stop unit)
26 Malfunction detection circuit (malfunction detection unit)
27 Stop circuit (stop unit)
51 Power Factor Improvement Unit 52 DC-DC Converter Unit 100 Switching Power Supply Device 200 Switching Power Supply Device 300 Switching Power Supply Device 400 Switching Power Supply Device 500 Switching Power Supply Device 600 Switching Power Supply Device 700 Switching Power Supply Device BD1 Bridge Diode C1 Capacitor C2 Capacitor C6 Capacitor D1 Diode D2 Diode L1 Choke coil L2 Coil L3 Coil L4 Coil L11 Winding L12 Winding L13 Winding Q1 Transistor (switching element, first switching element)
Q4 transistor (second switching element)
R1 resistor R2 resistor R3 resistor R4 resistor SW1 switch T1 transformer TIN1 input terminal TIN2 input terminal TOUT1 output terminal TOUT2 output terminal

Claims (11)

A power factor correction circuit including a first switching element and converting an input AC voltage into a DC voltage by a switching operation of the first switching element;
A DC-DC converter circuit that boosts the converted DC voltage and supplies it to a load;
A switching power supply device comprising a power factor correction control circuit that performs switching control of the first switching element,
A malfunction detection unit for detecting malfunction of the power factor correction circuit;
A switching power supply comprising: a stop unit that stops the operation of the DC-DC converter circuit when the malfunction detection unit detects a malfunction of the power factor correction circuit. The malfunction detector is
A detection circuit for detecting an output voltage of the power factor correction circuit after switching control of the first switching element by the power factor correction control circuit is started;
A malfunction detection circuit that detects malfunction of the power factor correction circuit based on the detected output voltage;
The stop part is
2. The switching power supply device according to claim 1, wherein when the malfunction detection circuit detects a malfunction of the power factor correction circuit, voltage supply to the load of the DC-DC converter circuit is stopped. The malfunction detector is
A detection circuit for detecting an output voltage of the power factor correction circuit after switching control of the first switching element by the power factor correction control circuit is started;
A malfunction detection circuit that detects malfunction of the power factor correction circuit based on the detected output voltage;
The stop part is
The supply of the DC voltage from the power factor correction circuit to the DC-DC converter circuit is stopped when the malfunction detection circuit detects a malfunction of the power factor improvement circuit. Switching power supply. The malfunction detector is
After the switching control of the first switching element by the power factor correction control circuit is started, a detection unit that detects an input AC current to the power factor correction circuit;
A malfunction detection circuit that detects malfunction of the power factor correction circuit based on the detected input AC current;
The stop part is
2. The switching power supply device according to claim 1, wherein when the malfunction detection circuit detects a malfunction of the power factor correction circuit, voltage supply to the load of the DC-DC converter circuit is stopped. The malfunction detector is
After the switching control of the first switching element by the power factor correction control circuit is started, a detection unit that detects an input AC current to the power factor correction circuit;
A malfunction detection circuit that detects malfunction of the power factor correction circuit based on the detected input AC current;
The stop part is
The supply of the DC voltage from the power factor correction circuit to the DC-DC converter circuit is stopped when the malfunction detection circuit detects a malfunction of the power factor improvement circuit. Switching power supply. The DC-DC converter circuit is
With a transformer,
A second switching element connected to the primary winding of the transformer;
A primary side control circuit for controlling a switching operation of the second switching element,
Boosting the converted DC voltage by a switching operation of the second switching element;
The said stop part makes the said primary side control circuit stop switching operation | movement of a said 2nd switching element, when the said malfunction detection circuit detects the malfunctioning of the said power factor improvement circuit, The said switching part is characterized by the above-mentioned. 5. The switching power supply device according to 4. The stop unit includes a switch provided between the power factor correction circuit and the DC-DC converter circuit;
6. The switching power supply device according to claim 3, further comprising: a stop circuit configured to turn off the switch when the malfunction detection circuit detects malfunction of the power factor correction circuit. 7. A power factor improving circuit that includes a switching element and converts an input AC voltage into a DC voltage by a switching operation of the switching element;
A DC-DC converter circuit that boosts the converted DC voltage and supplies it to a load;
A switching power supply device comprising a power factor correction control circuit that performs switching control of the switching element,
A malfunction detection unit for detecting malfunction of the power factor correction circuit;
A switching power supply device comprising: a warning generation unit that issues a warning when the malfunction detection unit detects a malfunction of the power factor correction circuit. The malfunction detector is
A detection circuit for detecting an output voltage of the power factor correction control circuit after switching control of the switching element by the power factor correction control circuit is started;
A malfunction detection circuit that detects malfunction of the power factor correction circuit based on the detected output voltage;
The switching power supply device according to claim 8, wherein the warning generation unit issues a warning when the malfunction detection circuit detects a malfunction of the power factor correction circuit. The malfunction detector is
After the switching control of the switching element by the power factor correction control circuit is started, a detection unit that detects an input AC current to the power factor correction circuit;
A malfunction detection circuit that detects malfunction of the power factor correction circuit based on the detected input AC current;
The switching power supply device according to claim 8, wherein the warning generation unit issues a warning when the malfunction detection circuit detects a malfunction of the power factor correction circuit. A power factor improving circuit that includes a switching element and converts an input AC voltage into a DC voltage by a switching operation of the switching element;
A DC-DC converter circuit that boosts the converted DC voltage and supplies it to a load;
A switching power supply device comprising a power factor correction control circuit that performs switching control of the switching element,
A malfunction detection unit for detecting malfunction of the power factor correction circuit;
A stop unit for stopping the operation of the DC-DC converter circuit when the malfunction detection unit detects a malfunction of the power factor correction circuit;
A switching power supply device comprising: a warning generation unit that issues a warning when the malfunction detection unit detects a malfunction of the power factor correction circuit.

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