WO2006019024A1 - スイッチング電源装置 - Google Patents
スイッチング電源装置 Download PDFInfo
- Publication number
- WO2006019024A1 WO2006019024A1 PCT/JP2005/014655 JP2005014655W WO2006019024A1 WO 2006019024 A1 WO2006019024 A1 WO 2006019024A1 JP 2005014655 W JP2005014655 W JP 2005014655W WO 2006019024 A1 WO2006019024 A1 WO 2006019024A1
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- Prior art keywords
- power supply
- voltage
- turned
- circuit
- switching
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
Definitions
- the present invention relates to a switching power supply device that can shorten the reset time of a latch circuit by quickly discharging the charge of a smoothing capacitor.
- FIG. 1 shows a circuit configuration diagram of a conventional switching power supply device.
- the full-wave rectifier circuit RC1 rectifies the AC input voltage of the AC power supply Vac that is input via the switch SW1, and the smoothing capacitor C1 smoothes the voltage rectified by the full-wave rectifier circuit RC1 to generate a direct current. Convert to voltage.
- Connected to both ends of the smoothing capacitor C1 is a series circuit of a primary winding P1 (number nl) of the transformer T and a switching element Q7 composed of an FET.
- the control unit 40 controls the switching operation of the switching element Q7 by the DC voltage from the smoothing capacitor C1.
- a series circuit of a diode D1 and a smoothing capacitor C3 is connected to both ends of the secondary winding S1 (number n2) of the transformer T, and the output voltage of the smoothing capacitor C3 is supplied to a load (not shown).
- the detector 43 detects an error voltage between the output voltage of the smoothing capacitor C3 and the reference voltage, and outputs the error voltage to the control circuit 44.
- a series circuit of FETQ1, resistor R2 and capacitor C2 is connected to both ends of smoothing capacitor C1, and resistor R1 is connected between the drain and gate of FETQ1.
- FETQ2 is connected between the connection point of resistor R2 and capacitor C2 and the gate of FETQ1, and Zener diode Z D1 is connected between the drain and source of FETQ2.
- a resistor R4 is connected between the drain and gate of FETQ2, FETQ3 is connected between the gate of FETQ2 and one end of capacitor C2, and a series circuit of resistor R3 and FETQ4 is connected to both ends of capacitor C2. ing.
- Comparator CP1 is a comparator with hysteresis.
- the voltage divided by resistors R5 and R6 is input to the + terminal, the reference voltage Vrl is input to the-terminal, and the voltage at the + terminal is the first voltage.
- Exceeds the threshold TH1 When the output becomes H level, the threshold value is set to the second threshold value TH2, which is smaller than the first threshold value TH1, and when the voltage falls below the second threshold value TH2, the output becomes L level and the threshold value becomes the first threshold value. Reset.
- the output of comparator CP1 is output to the base of transistor Q6 and the gate of FETQ3.
- the comparator CP2 inputs the voltage divided by the resistors R7 and R8 to one terminal, inputs the reference voltage Vr2 to the + terminal, and inputs the first threshold TH 1 and the second threshold of the comparator CP1. It is set to the third threshold TH3, which is lower than the threshold TH2, and the output goes to L level when the voltage force at one terminal exceeds the third threshold TH3, and the output goes to H level when it falls below the third threshold TH3.
- the output of the comparator CP2 is output to the latch circuit 41.
- a resistor R9 is connected between the base and collector of the transistor Q6, and a Zener diode ZD2 is connected between the collector emitters of the transistor Q6.
- the emitter of transistor Q6 is connected to the base of transistor Q5, and the collector of transistor Q5 is connected to the connection point of resistor R2 and capacitor C2.
- a resistor R10 is connected between the base and collector of the transistor Q5, and the collector of the transistor Q5 is connected to the oscillator 42 and the control circuit 44.
- the latch circuit 41 When the latch circuit 41 is reset by the H level from the comparator CP2 and the control circuit 44 also receives an uncontrollable detection signal indicating an abnormal state, an oscillation stop signal for stopping the switching operation of the switching element Q7. Is output to the oscillator 42 and the switching element Q7 is held (set). The output of latch circuit 41 is output to the gate of FETQ4. The control circuit 44 generates a control signal for turning on and off the switching element Q 7 based on the error voltage from the detector 43 and outputs the control signal to the oscillator 42. The oscillator 42 controls the switching operation of the switching element Q7 based on the control signal from the control circuit 44 and the signal from the latch circuit 41.
- FIG. 2 is a timing chart for explaining the operation of each part of the conventional switching power supply device shown in FIG.
- Vac is the voltage of the AC power supply
- VC1 is the voltage of the smoothing capacitor C1
- VLT is the output of the latch circuit 41
- VQ1 is the voltage of FETQ1
- VQ4 is the voltage of FETQ4
- VC2 is the voltage of capacitor C2
- VCP1 is the comparator CP1
- VCP2 indicates the output of comparator CP2.
- the switch SW1 when the switch SW1 is turned on, the AC input voltage from the AC power supply Vac is rectified by the full-wave rectifier circuit RC1, smoothed by the smoothing capacitor C1, and converted to a DC voltage. Due to this DC voltage, a constant current determined by the gate-source voltage Vgs, Zener diode ZD1, and resistor R2 of FETQ 1 flows through FETQ1, and capacitor C2 is charged.
- the comparator CP1 When the voltage VC2 divided by the resistor R5 and the resistor R6 becomes equal to or higher than the first threshold TH1, the comparator CP1 outputs the output VCP1 to the H level and the threshold is smaller than the first threshold TH1.
- the threshold value TH2 is set and the voltage VC2 falls below the second threshold value TH2, the output VCP1 force becomes SL level and the threshold value is reset to the first threshold value TH1.
- the comparator CP2 is set to the third threshold TH3. When the voltage VC2 exceeds the third threshold TH3, the output VCP2 becomes L level, and when the voltage VC2 becomes equal to or lower than the third threshold TH3, the output VCP2 becomes H level.
- the capacitor C2 is gradually charged by the current flowing through the FETQ1, and when the voltage VC2 of the capacitor C2 exceeds the third threshold TH3 of the comparator CP2, the output VCP2 of the comparator CP2 becomes L level, and the latch The circuit 41 is ready to accept the set signal.
- the switching element Q7 starts a switching operation
- energy is transmitted from the primary side to the secondary side via the transformer T
- the voltage generated in the secondary winding S1 of the transformer T2 is the diode D1
- the DC voltage is output after being rectified and smoothed by the smoothing capacitor C3.
- the control circuit 44 generates a control signal based on the error voltage from the detector 43, changes the ON width of the switching element Q7 by the control signal, and controls the output voltage of the smoothing capacitor C3 to a predetermined voltage.
- the auxiliary power generated by the tertiary winding P2 of the transformer T and the diode D4 is supplied to the transmitter 42 and the control circuit 44 via the transistor Q5, and the switching operation of the switching element Q7 is continued.
- the output voltage of the smoothing capacitor C3 cannot be controlled to a predetermined voltage, the voltage of the auxiliary power source by the tertiary winding P2 is lowered, and the voltage VC2 of the capacitor C2 is also lowered.
- the voltage VC2 reaches the second threshold value TH2 of the comparator CP1
- the output VCP1 of the comparator CP1 is inverted and becomes L level
- the transistor Q6 is turned on and the transistor Q5 is turned off, so that the oscillator 41, the control circuit 44
- the power supply to is cut off, and switching element Q7 stops switching.
- FETQ3 turns off and FETQ2 turns off.
- FETQ1 turns on and charging of capacitor C2 begins.
- the control circuit 44 does not resume operation.
- the detector 43 detects an abnormal state such as an overvoltage and outputs an abnormal state detection signal to the control circuit 44.
- the control circuit 44 outputs an uncontrollable detection signal to the latch circuit 41 based on the abnormal state detection signal, and sets the latch circuit 41. Therefore, the oscillation stop signal, which is the output VLT of the latch circuit 41, becomes H level, the oscillator 42 stops oscillating by the oscillation stop signal, and the switching element Q7 stops the switching operation.
- FETQ4 is turned on by the output VLT from the latch circuit 41, and the charge of the capacitor C2 is discharged through the resistor R3. For this reason, the voltage VC2 of the capacitor C2 decreases.
- the second threshold TH2 of the comparator CP1 is reached at time t2
- the output VCP1 of the comparator CP1 is inverted and becomes L level.
- the transistor Q6 is turned on and the transistor Q5 is turned off, so that power is not supplied to the oscillator 42 and the control circuit 44.
- FETQ1 turns on because FE TQ3 turns off and FETQ2 turns off.
- the smoothing capacitor C1 Since the switch SW1 is not turned off, the smoothing capacitor C1 has a sufficient voltage, so that the capacitor C2 is charged by the DC voltage of the smoothing capacitor C1.
- the charging current by FETQ1 is set larger than the discharging current by resistor R3, so the voltage VC2 of capacitor C2 begins to rise.
- FETQ3 When the voltage VC2 of the capacitor C2 reaches the first threshold THI at time t3, FETQ3 is turned on and FETQ2 is turned on, so that FETQ1 is turned off and charging of the capacitor C2 is stopped. Then, since the capacitor C2 is only discharged by the resistor R3, the voltage VC2 of the capacitor C2 starts to drop.
- the capacitor C2 is charged as described above.
- the oscillator 42 is stopped by the latch circuit 41 and the switching operation of the switching element Q7 is stopped.
- the comparators CP1, CP2, latch circuit 41, etc. continue to operate while holding the voltage. In this state, the oscillator 42 is stopped by the latch circuit 41, and only a small amount of power is required when the latch circuit 41 is in operation, and it is not necessary to supply continuously from FETQ1, so FETQ1 is turned on. A small amount of power supplied while repeating Z-off is sufficient.
- the starting circuit power supplies the power to continue the operation of the latch circuit 41, but the purpose is different. Reduction of discharge time of smoothing capacitor C1 when switch SW1 is turned off is not considered.
- the switching control circuit 25 When the voltage reaches the specified voltage (starting potential of the switching control circuit 25), the switching control circuit 25 is started, The switching operation of the switching element 17 is started. Then, the triac 15 is turned on via the transformer 18, and the secondary side of the transformer 18 supplies a stable DC voltage to the load 31 by the rectifying and smoothing circuits 9 and 14. Further, since the charging voltage of the primary side smoothing capacitor 16 is higher than the operating voltage of the Zener diodes 38 and 39, the transistor 36 is off.
- the switching control circuit 25 detects when the input voltage is lost by the detection circuit that detects the input voltage consisting of the Zener diode 31, the resistor 32, the transistor 33, the photocoupler 34, and the resistor 35. Stop. Then, the voltage of the primary side smoothing capacitor 16 is detected by the Zener diodes 39 and 38, and when the detected voltage becomes a predetermined voltage or less, the transistor 36 is turned on, and the charge of the primary side smoothing capacitor 16 is resisted. Discharge with 27 and transistor 36.
- the switch SW1 is turned off until the smoothing capacitor C1 is sufficiently discharged (the latch circuit). Reset time when 41 is reset), power cannot be turned on again.
- the smoothing capacitor C1 requires a large capacity in order to extend the guaranteed output time in the event of a power failure. However, if this capacitance is large, the time for which the latch circuit 41 is reset becomes longer.
- the input side force also supplies power to the control unit 40 via the activation circuit in order to operate the latch circuit 41.
- the switch SW1 When the switch SW1 is turned off, the energy stored in the smoothing capacitor C1 is discharged by the start-up circuit, but normally only the power necessary to hold the latch circuit 41 need be supplied, so the reset time is It won't be too short.
- increasing the current flowing through the startup circuit increases the loss and generates heat.
- the capacitance of the smoothing capacitor C1 increases, the discharge energy increases and heat generation increases.
- a discharge resistor is connected in parallel with the smoothing capacitor C1, the discharge will be faster, but since a voltage is always applied to the discharge resistor, a loss occurs and the efficiency deteriorates.
- the primary-side smoothing capacitor 16 can be discharged with a larger current than at the time of startup. Is applied to the resistor 27, and a power loss is always generated in the resistor 27, and the efficiency is lowered.
- the starting current and the discharge current of the primary side smoothing capacitor 16 cannot be adjusted individually, the starting time and the reset time of the latch circuit cannot be arbitrarily set. If the input voltage drops due to some external abnormality and the Zener diodes 38 and 39 do not conduct, the discharge circuit may work and the resistor 27 may overheat.
- An object of the present invention is to provide a switching power supply device that can shorten the reset time of the latch circuit by quickly discharging the charge of the smoothing capacitor on the input side, and can stop the starting circuit in the event of an overheat abnormality.
- a DC voltage obtained by rectifying the AC input voltage of an AC power supply and smoothing it with a smoothing capacitor is converted into a switching element by a control unit.
- a switching power supply device that converts to another DC voltage by performing a switching operation supplies a starting power supply for starting the switching operation of the switching element to the control unit when the AC power supply is turned on.
- Latch means for holding a switching operation stop state of the switching element when an abnormality other than an overheat abnormality of the activation means, When the latch means holds the switching operation stopped state, the charge of the smoothing capacitor is discharged to quickly reset the latch means when the AC power supply is turned off, and the detection from the overheat detection means Start control means for stopping the start means by a signal And a step.
- a voltage detecting means for detecting that the AC power supply is turned off based on an AC input voltage of the AC power supply when the latch means holds the stop state of the switching operation.
- the voltage detecting means detects that the AC power supply is turned off, an electric current having an average current larger than the current when the AC power supply is turned on is discharged to discharge the charge of the smoothing capacitor.
- the latch means is reset earlier.
- FIG. 1 is a circuit configuration diagram of Conventional Example 1 of a conventional switching power supply device.
- FIG. 2 is a timing chart for explaining the operation of each part of Conventional Example 1 of a conventional switching power supply device.
- FIG. 3 is a circuit configuration diagram of Conventional Example 2 of a conventional switching power supply device.
- FIG. 4 is a circuit configuration diagram of the switching power supply device according to the first embodiment of the present invention.
- FIG. 5 is a timing chart for explaining the operation of each part of the switching power supply device according to the first embodiment of the present invention.
- FIG. 6 is a circuit configuration diagram of a switching power supply device according to a second embodiment of the present invention.
- FIG. 7 is a timing chart for explaining the operation of each part of the switching power supply device according to the second embodiment of the present invention.
- FIG. 4 is a circuit configuration diagram of the switching power supply device according to the first embodiment of the present invention.
- the current that flows in FETQ1 satisfies the function during start-up, stop, and latch circuit operation (when the oscillation stop signal is output), and FET Q1 overheats.
- the current was set to a level that did not. Therefore, the FETQ1 current does not require a large current and starts when the latch circuit 41 is set and the switch SW1 is turned off. Even if the smoothing capacitor CI was discharged in the circuit, the reset time could not be shortened.
- the switching power supply device of the first embodiment shown in FIG. 4 further includes an overheat detector 45, an AND circuit 46, an inverter 47, and an NAND circuit in addition to the conventional switching power supply device shown in FIG. 48, 49, 50, Comparator CP3, Resistor R13, 14 are provided, the current flowing through the starting circuit is set large, and when the latch circuit 41 is set, the charge of the smoothing capacitor C1 is discharged by the starting circuit, and the switch SW1
- This feature is characterized in that the discharge of the smoothing capacitor C 1 when the switch is turned off is shortened to shorten the reset time.
- FETs Q1 to Q3, resistors Rl, R2, R4, and Zener diode ZD1 constitute a start-up circuit, and this start-up circuit starts to start the switching operation of switching element Q7 when switch SW1 is turned on. After the power is supplied to the control unit 40a and the switching operation of the switching element Q7 is started, the supply of the starting power supply to the control unit 40a is stopped.
- the latch circuit 41 is configured to output a non-controllable signal from the control circuit 44a when the protection circuit is activated due to an output overvoltage or the like (including overheat protection provided separately from the present invention). It is set and the switching operation of switching element Q7 is stopped.
- the overheat detector 45 is thermally coupled to the FETQ1, detects the temperature of the FETQ1, and outputs an H level detection signal indicating an overheat abnormality detection of the FETQ1 when the temperature exceeds a predetermined temperature.
- Inverter 47 inverts the output of overheat detector 45.
- the AND circuit 46 calculates an AND (logical product) of the output of the latch circuit 41 and the output of the inverter 47, and outputs the output to the gate of FETQ4.
- the NAND circuit 50 calculates the NAND (negative AND) of the output of the latch circuit 41 and the output of the comparator CP3 and outputs the output to the NAND circuit 49.
- the NAND circuit 49 calculates the NAND of the output of the NAND circuit 50 and the output of the comparator CP1 and outputs the output to the NAND circuit 48.
- the NAND circuit 48 calculates the NAND of the output of the NAND circuit 49 and the output of the inverter 47 and outputs it to the gate of the FETQ3.
- the inverter 47 and the NAND circuits 48 to 50 are turned off when the switch SW1 is turned off by discharging the charge of the smoothing capacitor C1 when the latch circuit 41 keeps holding the switching operation stop state of the switching element Q7.
- the start control means is configured to speed up the reset of the latch circuit 41 and stop the start circuit by the detection signal of the overheat detector 45 force.
- Launch The control means may be configured to reduce the current flowing through the start circuit by the detection signal from the overheat detector 45 instead of stopping the start circuit by the detection signal from the overheat detector 45.
- a series circuit of a resistor 13 and a resistor 14 is connected to both ends of the smoothing capacitor C1, and a connection point between the resistors 13 and 14 is connected to one terminal of the comparator CP3.
- the comparator CP3 detects the voltage of the smoothing capacitor C1, and outputs an H level to the NAND circuit 50 when the divided voltage of the resistor R13 and the resistor R14 becomes equal to or lower than the reference voltage Vr3.
- Resistor R1, 3, resistor 14, reference voltage Vr3, and comparator CP3 constitute the input voltage drop detection circuit.
- the NAND circuits 48, 49, 50 turn on FETQ1 when the latch circuit 41 is set, an oscillation stop signal is output, and the voltage of the smoothing capacitor C1 falls below the reference voltage Vr3.
- the charge of the smoothing capacitor C1 is discharged more quickly. That is, by using the starter circuit positively, the charge of the smoothing capacitor C1 can be discharged by adding a few components.
- the overheat detector 45 thermally coupled to FETQ1 is provided, the current flowing through FETQ1 can be increased safely without considering the ambient temperature.
- the overheat detector 45 detects an overheat abnormality when the temperature of the FETQ1 rises to the specified temperature, and protects the FETQ1 by turning it off with the detection signal. As a result, the current flowing through FETQ1 can be increased safely, and the reset time of the latch circuit 41 can be shortened.
- the latch circuit 41 is set at time tl to stop the switching operation of the switching element Q7.
- the switch is made at time t6.
- the NAND circuit 50 calculates the NAND of the H level from the comparator CP3 and the H level from the latch circuit 41, and outputs the L level to the NAND circuit 49.
- the NAND circuit 49 calculates the NAND between the H level from the comparator CP 1 and the L level from the NAND circuit 50, and outputs the H level to the NAND circuit 48.
- the NAND circuit 48 calculates the NAND of the H level from the NAND circuit 49 and the H level from the inverter 47 (overheat detection! /, When) and after time t9, always FETQ3 and FETQ2 And turn off FETQ1 continuously.
- the FETQ1 when the latch circuit 41 is set and the voltage VC1 of the smoothing capacitor C1 falls below the reference voltage Vr3, the FETQ1 is always turned on, and the current flowing through the FETQ1 is increased. The loss increases and the temperature rises. Then, when the temperature of FETQ1 exceeds the predetermined temperature from time tlO to t11, the overheat detector 45 thermally coupled to FETQ1 detects the overheat abnormality of FETQ1, and the H level is passed through the inverter 47. Output to the NAND circuit 46 and the NAND circuit 48. The AND circuit 46 calculates the AND of the L level from the inverter 47 and the H level from the latch circuit 41, and outputs the L level to the FETQ4. For this reason, FETQ4 turns off and the discharge of capacitor C2 stops.
- NAND circuit 48 calculates the NAND of the L level from inverter 47 and the H level from NAND circuit 49 and outputs an H level to FETQ3, FETQ2 and FETQ3 are turned on, and FETQ1 is Turn off. At this time, no current flows through FETQ1 until the temperature of FETQ1 drops, so even if the set current is increased, the parts will not be damaged.
- FIG. 6 is a circuit configuration diagram of the switching power supply device according to the second embodiment of the present invention.
- FETQ1 when the AC input voltage is monitored and there is no AC input, FETQ1 is always turned on, and FETQ9 is turned on and FETQ8 is turned on to short-circuit the resistor R11.
- FETQ9 when the AC input voltage is monitored and there is no AC input, FETQ9 is turned on and FETQ8 is turned on to short-circuit the resistor R11.
- the current flowing through the starting circuit is increased, and the charge of the smoothing capacitor C1 is discharged more efficiently, thereby shortening the reset time.
- the anode of the diode D2 is connected to one end TP1 of the full-wave rectifier circuit RC1, and the anode of the diode D3 is connected to the other end TP2 of the full-wave rectifier circuit RC1.
- the force swords of the diode D2 and the diode D3 are connected in common, and this connection point is connected to one end of each of the resistor R13 and the capacitor C4.
- a capacitor C4 is connected in parallel to the series circuit of the resistor R13 and the resistor R14.
- Diodes D2 and D3, resistor R13, resistor R14, comparator CP3, and reference voltage Vr3 form an input voltage detection circuit.
- Comparator CP3 is a full-wave rectifier circuit with diodes D2 and D3 and capacitor C4.
- a resistor R11 is connected between the resistor R2 and the capacitor C2
- a FETQ8 is connected in parallel to the resistor R11
- a resistor R12 is connected between the drain and gate of the FETQ8.
- FETQ9 is connected between the gate of FETQ8 and one end of capacitor C2.
- the AND circuit 46b calculates an AND of the output from the comparator CP3 and the output from the latch circuit 41, and outputs the AND output to the gate of the FETQ9.
- the capacitor C4 is sufficiently small and has a capacitance with respect to the smoothing capacitor C1, and when the AC input voltage is lost, the resistor R13, the resistor 14, and the capacitor C4 are immediately discharged immediately before the smoothing capacitor C1.
- the resistor R13, the resistor 14, and the capacitor C4 are immediately discharged immediately before the smoothing capacitor C1.
- set resistor R13, resistor R14, and capacitor C4 so that the output of comparator CP3 is at L level.
- the AND circuit 46b includes an H level from the comparator CP3 and an H level from the latch circuit 41. Calculate AND with level and turn on FETQ9 and FETQ8. For this reason, the current flowing through FETQ1 increases. At this time, about twice as much current flows in FETQ1 as in a normal state (for example, from time t2 to time t8), and FET1Q1 has a voltage VC2 between the second threshold TH2 and the first threshold TH1 of comparator CP1. Since it is turned on / off when it is in between, the on-time and off-time are shorter than in the normal state from time tlO to time tl2.
- the voltage Vcl of the smoothing capacitor C1 decreases as the electric charge of the smoothing capacitor C1 is discharged
- the voltage Vc2 of the capacitor C2 reaches the first threshold THI from the second threshold TH2. Since the time becomes longer, the on-time of FETQ1 gradually increases from time tl4 to time tl5. The voltage Vc2 drops to the third threshold TH3 at time tl6. Accordingly, since the charge of the smoothing capacitor C1 is discharged quickly and efficiently, the reset time of the latch circuit 41 can be shortened efficiently.
- the reset time is the time from time t6 to time tl6.
- the comparator is only set when the latch circuit 41 is set (when the output of the latch circuit 41 is at the H level).
- the above-described operation is performed by a signal from CP3.
- the overheat detector 45 Since the overheat detector 45 is provided, when the overheat detector 45 operates and outputs an H level at the time tl2, FETQ4 is turned off by the inverter 47 and the AND circuit 46a, and the capacitor formed by the resistor R3. C2 discharge stops. Since NAND circuit 48 outputs an H level to FETQ3, FETQ3 is turned on, FETQ2 is turned on, FETQ1 is turned off, and FETQ1 is protected from damage due to overheating. When the temperature of FETQ1 falls, the output of overheat detector 45 goes to L level, and FETQ1 and FETQ4 are turned on again, and the charge of smoothing capacitor C1 is discharged by FETQ1, resistor R2, resistor R3, and FETQ4.
- the components to be used can be integrated into an integrated circuit.
- external components can be eliminated by the integration of an integrated circuit.
- the integrated circuit can reduce the delay in thermal response to the thermal detection of FETQ1, thus improving safety.
- the start-up control means expedites resetting of the latch means when the AC power is turned off by discharging the charge of the smoothing capacitor when the latch means holds the stop state of the switching operation. Therefore, the reset time of the latch means can be shortened.
- the start control means stops the start means by the detection signal from the overheat detection means, the start means can be stopped even when the ambient temperature is high! Can be increased.
- the present invention is applicable to switching power supply devices such as an AC-DC converter and a DC-DC converter.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112005001979T DE112005001979T5 (de) | 2004-08-18 | 2005-08-10 | Schaltleistungs-Zuführvorrichtung |
US11/660,590 US7492614B2 (en) | 2004-08-18 | 2005-08-10 | Switching power supply apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004238283A JP4333519B2 (ja) | 2004-08-18 | 2004-08-18 | スイッチング電源装置 |
JP2004-238283 | 2004-08-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006019024A1 true WO2006019024A1 (ja) | 2006-02-23 |
Family
ID=35907412
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/014655 WO2006019024A1 (ja) | 2004-08-18 | 2005-08-10 | スイッチング電源装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US7492614B2 (ja) |
JP (1) | JP4333519B2 (ja) |
KR (1) | KR100904121B1 (ja) |
CN (1) | CN100456612C (ja) |
DE (1) | DE112005001979T5 (ja) |
WO (1) | WO2006019024A1 (ja) |
Families Citing this family (29)
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US7786533B2 (en) * | 2001-09-07 | 2010-08-31 | Power Integrations, Inc. | High-voltage vertical transistor with edge termination structure |
US6635544B2 (en) * | 2001-09-07 | 2003-10-21 | Power Intergrations, Inc. | Method of fabricating a high-voltage transistor with a multi-layered extended drain structure |
US8009452B1 (en) * | 2007-03-03 | 2011-08-30 | Sadwick Laurence P | Multiple driver power supply |
JP4979499B2 (ja) * | 2007-07-27 | 2012-07-18 | アズビル株式会社 | 監視装置および温度調節計 |
US8564338B2 (en) | 2008-03-03 | 2013-10-22 | Thomson Licensing | Switchable load for initializing an output voltage of a power supply |
DE102008016754A1 (de) * | 2008-03-31 | 2009-10-01 | Tridonicatco Gmbh & Co. Kg | Niedervoltversorgung in Betriebsgeräten für Leuchtmittel |
JP5283751B2 (ja) * | 2009-05-13 | 2013-09-04 | 三菱電機株式会社 | 電力変換装置および電力変換装置のコンデンサ電圧の制御方法 |
US8422179B2 (en) * | 2009-07-22 | 2013-04-16 | Intersil Americas Inc. | Inrush current control |
US8115457B2 (en) | 2009-07-31 | 2012-02-14 | Power Integrations, Inc. | Method and apparatus for implementing a power converter input terminal voltage discharge circuit |
US8339055B2 (en) * | 2009-08-03 | 2012-12-25 | Intersil Americas Inc. | Inrush current limiter for an LED driver |
US8207577B2 (en) * | 2009-09-29 | 2012-06-26 | Power Integrations, Inc. | High-voltage transistor structure with reduced gate capacitance |
EP2517341B1 (en) * | 2009-12-23 | 2019-06-26 | Marvell World Trade Ltd. | Start-up supply for a switch mode power supply |
JP5552847B2 (ja) * | 2010-03-11 | 2014-07-16 | 株式会社リコー | 電源装置、画像形成装置 |
CN102377358B (zh) | 2010-08-23 | 2014-09-10 | 昂宝电子(上海)有限公司 | 用于降低开关模式电源变换器的待机功耗的系统和方法 |
JP5541044B2 (ja) * | 2010-09-28 | 2014-07-09 | サンケン電気株式会社 | ゲート駆動回路及びスイッチング電源装置 |
US9374019B2 (en) * | 2010-09-28 | 2016-06-21 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for discharging an AC input capacitor with automatic detection |
US8742735B2 (en) | 2011-05-16 | 2014-06-03 | Marvell World Trade Ltd. | High-voltage startup circuit |
EP2710724A2 (en) | 2011-05-16 | 2014-03-26 | Marvell World Trade Ltd. | High-voltage startup circuit |
US8710804B2 (en) * | 2011-07-25 | 2014-04-29 | Semiconductor Components Industries, Llc | Discharge circuit and method |
JP5974548B2 (ja) * | 2012-03-05 | 2016-08-23 | 富士電機株式会社 | 半導体装置 |
JP5991109B2 (ja) * | 2012-09-20 | 2016-09-14 | 富士電機株式会社 | スイッチング電源装置 |
JP6155586B2 (ja) * | 2012-09-21 | 2017-07-05 | サンケン電気株式会社 | スイッチング電源装置 |
CN103019145A (zh) * | 2012-12-20 | 2013-04-03 | 四川九洲电器集团有限责任公司 | 能够实现电源监控及保护的系统 |
US9622331B2 (en) * | 2012-12-26 | 2017-04-11 | Unison Industries, Llc | Discharge switch device for ignition excitation system |
JP2016093064A (ja) * | 2014-11-11 | 2016-05-23 | アール・ビー・コントロールズ株式会社 | 電源装置 |
JP6476447B2 (ja) * | 2014-11-13 | 2019-03-06 | アール・ビー・コントロールズ株式会社 | 電源装置 |
JP6696308B2 (ja) * | 2016-06-09 | 2020-05-20 | 富士電機株式会社 | スイッチング電源装置 |
JP6935137B2 (ja) * | 2017-12-05 | 2021-09-15 | アール・ビー・コントロールズ株式会社 | スイッチング電源装置 |
CN111327214B (zh) * | 2018-12-13 | 2024-04-19 | 恩智浦有限公司 | 用于无线充电系统的同步整流器 |
Citations (4)
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JP2001016863A (ja) * | 1999-06-25 | 2001-01-19 | Matsushita Electric Works Ltd | 電源装置 |
JP2003169471A (ja) * | 2001-12-03 | 2003-06-13 | Murata Mfg Co Ltd | スイッチング電源装置 |
WO2003103121A1 (ja) * | 2002-05-30 | 2003-12-11 | サンケン電気株式会社 | コンバータ |
JP2004080890A (ja) * | 2002-08-14 | 2004-03-11 | Nec Corp | 温度保護回路 |
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US5297014A (en) * | 1991-01-09 | 1994-03-22 | Canon Kabushiki Kaisha | Switching DC power supply apparatus |
JPH07163142A (ja) | 1993-11-30 | 1995-06-23 | Tec Corp | スイッチング電源 |
JPH09247931A (ja) * | 1996-03-13 | 1997-09-19 | Tec Corp | スイッチング電源装置 |
JP3363341B2 (ja) * | 1997-03-26 | 2003-01-08 | 松下電工株式会社 | 非接触電力伝達装置 |
JP3607823B2 (ja) * | 1998-11-19 | 2005-01-05 | 横河電機株式会社 | スイッチング電源装置 |
JP3337009B2 (ja) * | 1999-07-02 | 2002-10-21 | 株式会社村田製作所 | スイッチング電源装置 |
JP2002315342A (ja) * | 2001-04-12 | 2002-10-25 | Tdk Corp | スイッチング電源装置 |
JP2002262556A (ja) * | 2002-03-04 | 2002-09-13 | Seiko Epson Corp | スイッチング電源装置 |
JP3636191B2 (ja) | 2002-04-23 | 2005-04-06 | オンキヨー株式会社 | スイッチング電源 |
US6813170B2 (en) * | 2002-08-19 | 2004-11-02 | Semtech Corporation | Multiple output power supply having soft start protection for load over-current or short circuit conditions |
JP4669306B2 (ja) * | 2005-03-10 | 2011-04-13 | 三洋電機株式会社 | 擬似共振方式スイッチング電源装置及びそれを用いた擬似共振方式スイッチング電源回路 |
US7315130B1 (en) * | 2006-12-27 | 2008-01-01 | General Electric Company | Switching control for inverter startup and shutdown |
-
2004
- 2004-08-18 JP JP2004238283A patent/JP4333519B2/ja not_active Expired - Fee Related
-
2005
- 2005-08-10 WO PCT/JP2005/014655 patent/WO2006019024A1/ja active Application Filing
- 2005-08-10 CN CNB2005800314756A patent/CN100456612C/zh not_active Expired - Fee Related
- 2005-08-10 DE DE112005001979T patent/DE112005001979T5/de not_active Withdrawn
- 2005-08-10 KR KR1020077005995A patent/KR100904121B1/ko not_active IP Right Cessation
- 2005-08-10 US US11/660,590 patent/US7492614B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001016863A (ja) * | 1999-06-25 | 2001-01-19 | Matsushita Electric Works Ltd | 電源装置 |
JP2003169471A (ja) * | 2001-12-03 | 2003-06-13 | Murata Mfg Co Ltd | スイッチング電源装置 |
WO2003103121A1 (ja) * | 2002-05-30 | 2003-12-11 | サンケン電気株式会社 | コンバータ |
JP2004080890A (ja) * | 2002-08-14 | 2004-03-11 | Nec Corp | 温度保護回路 |
Also Published As
Publication number | Publication date |
---|---|
KR20070043888A (ko) | 2007-04-25 |
JP2006060891A (ja) | 2006-03-02 |
KR100904121B1 (ko) | 2009-06-24 |
US7492614B2 (en) | 2009-02-17 |
CN100456612C (zh) | 2009-01-28 |
DE112005001979T5 (de) | 2007-08-02 |
JP4333519B2 (ja) | 2009-09-16 |
US20070274104A1 (en) | 2007-11-29 |
CN101027830A (zh) | 2007-08-29 |
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