WO2004068686A1 - 電源装置 - Google Patents
電源装置 Download PDFInfo
- Publication number
- WO2004068686A1 WO2004068686A1 PCT/JP2004/000089 JP2004000089W WO2004068686A1 WO 2004068686 A1 WO2004068686 A1 WO 2004068686A1 JP 2004000089 W JP2004000089 W JP 2004000089W WO 2004068686 A1 WO2004068686 A1 WO 2004068686A1
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- Prior art keywords
- diode
- power supply
- current
- resistor
- voltage
- Prior art date
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Classifications
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- 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
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- 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
- H02M3/338—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 in a self-oscillating arrangement
- H02M3/3385—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 in a self-oscillating arrangement with automatic control of output voltage or current
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S323/00—Electricity: power supply or regulation systems
- Y10S323/907—Temperature compensation of semiconductor
Definitions
- the present invention relates to a power supply device such as a DC-DC converter, and more particularly to a technique for protecting a power supply device from overheating and overvoltage.
- the overheat protection circuit of a DC-DC converter includes a temperature-sensitive element such as a thermistor and a control element such as a thyristor that operates in response to the temperature-sensitive element.
- the control element stops the power supply to the control circuit by discharging the control power supply capacitor, and stops the operation of the DC-DC converter.
- a power supply device provided with an overvoltage protection circuit
- a power supply device in which a resistor is connected in parallel to a light emitting diode forming a photo-power blur is known.
- the leakage current when the temperature of the diode diode is low flows through the light emitting diode bypassing the light emitting diode, and when the current from the voltage detection circuit becomes equal to or more than the set current value, the starting voltage of the light emitting diode is increased.
- a resistor having a resistance value that can establish the resistance is selected to prevent malfunction at high temperatures (see Japanese Patent Application Laid-Open No. Hei 6-233528).
- An object of the present invention is to provide a power supply device that can reduce costs.
- the present invention focuses on the fact that the reverse current of a short-circuit diode rapidly increases at a high temperature of, for example, 120 ° C., and utilizes this characteristic to provide overheat protection and overvoltage protection functions.
- a first invention is a power supply device having a main circuit for converting an input AC or DC to another DC, and a control circuit for controlling the main circuit, wherein the power supply device is disposed at a temperature measurement site as a temperature detecting element.
- the reverse voltage is applied, a reverse leakage current flows, a Schottky diode flows, a detecting means for detecting the reverse leakage current flowing in the Schottky barrier diode, and an output of the detecting means is equal to or more than a predetermined value.
- a control element for stopping the operation of the control circuit when the control circuit is turned off.
- the detecting means includes: a light-emitting element connected to a DC output terminal of the main circuit; a light-receiving element that flows a current in response to light emission of the light-emitting element; and a short-circuit diode.
- Current control means connected between the light emitting element and flowing a current to the light emitting element when a voltage corresponding to a reverse leakage current flowing through the short-circuit diode becomes equal to or higher than a reference voltage;
- the control element is based on a current flowing through the light receiving element. The operation of the control circuit is stopped.
- the current control means supplies the current to the light emitting element when the voltage corresponding to the reverse leakage current flowing in the Schottky barrier diode becomes equal to or higher than the reference voltage.
- the overheat protection level (latch temperature) can be set accurately without being affected by the current transfer ratio.
- the voltage corresponding to the reverse leakage current flowing through the Schottky rear diode is equal to or lower than the reference voltage, the reverse leakage current does not flow into the light emitting element, so that the reverse leakage current does not affect the overvoltage protection circuit.
- Overvoltage protection level (latch voltage) can be set accurately.
- the current control means includes a resistor connected in series with the Schottky barrier diode, and a voltage generated in the resistor due to a reverse leakage current flowing through the Schottky barrier diode.
- the invention has a Zener diode connected between an output terminal of the comparator and a negative electrode terminal of the DC output terminal, wherein the Zener diode has a predetermined voltage between the DC output terminals. A current is supplied to the light emitting element when the voltage becomes higher than the breakdown voltage.
- the current control means is configured such that a voltage generated in the resistor due to a resistor connected in series with the short-circuit diode and a reverse leakage current flowing in the short-circuit diode becomes equal to or higher than a reference voltage.
- the light emitting element is connected between a positive terminal of the DC output terminal and the transistor, and emits light when a current of a predetermined value or more flows when the transistor is turned on. It is characterized by I do.
- the invention includes a zener diode connected between the light emitting element and a negative electrode end of the DC output terminal, wherein the zener diode has a voltage between the DC output terminals greater than a predetermined breakdown voltage. When this happens, a current is passed through the light emitting element.
- the current control means has a resistor connected in series to the Schottky barrier diode, and the light emitting element is connected to both ends of the resistor, and a current flowing through the Schottky diode is connected to the opposite end of the Schottky diode.
- the current control means has a resistor connected in series to the short-circuit diode, and a diode having a node connected to a connection point between the Schottky diode and one end of the resistor.
- the light emitting element is connected between a force source of the diode and the other end of the resistor, and a voltage generated in the resistor due to a reverse leakage current flowing through the Schottky rear diode has a forward threshold voltage of the diode.
- the power supply device further includes a zener diode connected between a positive electrode end of the DC output terminal and the light emitting element, wherein the zener diode has a voltage between the DC output terminals lower than a predetermined breakdown voltage. An electric current is supplied to the light emitting element when it becomes larger.
- a rectifier diode connected to a main current path of the main circuit, wherein the Schottky diode and the rectifier diode are thermally coupled and mechanically integrated. It is characterized by having.
- a current connected to a main current path of the main circuit It has a detection resistor, and the Schottky barrier diode and the current detection resistor are thermally coupled and mechanically integrated.
- FIG. 1 is a circuit diagram illustrating a configuration of the power supply device according to the first embodiment.
- FIG. 2 shows a Schottky parier die used in the power supply device of the first embodiment.
- FIG. 6 is a characteristic diagram showing a relationship between the temperature of the diode and the reverse current.
- FIG. 3 is a front view schematically showing a composite part of a Schottky barrier diode and a rectifying diode used in the power supply device of the first embodiment.
- FIG. 4 is a circuit diagram illustrating a configuration of a power supply device according to the second embodiment.
- FIG. 5 is a circuit diagram illustrating a configuration of a power supply device according to the third embodiment.
- FIG. 6 is a circuit diagram illustrating a configuration of a power supply device according to the fourth embodiment.
- FIG. 7 is a circuit diagram illustrating a configuration of a power supply device according to the fifth embodiment.
- FIG. 8 is a circuit diagram illustrating a configuration of a power supply device according to the sixth embodiment.
- FIG. 9 is a front view schematically showing a composite part of a Schottky barrier diode and a resistor used in the power supply device according to the sixth embodiment.
- FIG. 10 is a circuit diagram showing a configuration of a power supply device according to the seventh embodiment.
- FIG. 11 is a circuit diagram illustrating a configuration of a power supply device according to the eighth embodiment.
- FIG. 12 is a circuit diagram showing the configuration of the power supply device according to the ninth embodiment. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a circuit diagram showing a configuration of the power supply device of the first embodiment.
- the rectifying / smoothing circuit 2 of the input stage connected to 1 is provided.
- the rectifying and smoothing circuit 2 includes a diode bridge rectifying circuit 3 and an input stage smoothing capacitor C1.
- the input terminal of the diode bridge rectifier circuit 3 is connected to AC input terminals 1a and 1 and the output terminal is connected to a pair of DC lines 4a and 4b.
- Smoothing capacitor C1 is connected between DC lines 4a and 4b.
- the rectifying and smoothing circuit 2 converts an AC voltage applied from the AC power supply 1 via the AC input terminals 1a and 1b into a DC voltage.
- a switch Q 1 composed of a field effect transistor is connected through a primary winding N 1 of a transformer 5. Is connected.
- the transformer 5 has a secondary winding N2 and an auxiliary winding N3 electromagnetically coupled to a primary winding N1 via a core 6.
- the secondary winding N 2 is connected to a load 8 via a rectifying and smoothing circuit 7 in the output stage.
- the rectifying / smoothing circuit 7 includes a rectifying diode D 51 and a smoothing capacitor C 51.
- the smoothing capacitor C 51 is connected in parallel to the secondary winding N 2 via a rectifying diode D 51.
- the polarity of the secondary winding N2 and the rectifying diode D51 is determined so that the rectifying diode D51 conducts while the switch Q1 is off.
- a pair of DC output terminals 8 a and 8 b for connecting the load 8 are connected to both ends of the smoothing capacitor C 51.
- the rectifying / smoothing circuit 7 converts the voltage induced in the secondary winding N2 into a DC voltage and outputs the DC voltage to a pair of DC output terminals 8a and 8b.
- the rectifier diode D51 may be configured to conduct while the switch Q1 is on.
- the rectifying / smoothing circuit 2 in the input stage, the transformer 5, the switch Q1, and the rectifying / smoothing circuit 7 in the output stage correspond to the main circuit of the present invention.
- a first circuit 16a constituting a part of the overheat and overvoltage protection device is provided.
- the first circuit 16a is a pair Between the DC output terminals 8 a and 8 b of the first series circuit of a diode D 53, a resistor R 54 and a light emitting diode PC 2, and a Zener diode D 53 and a resistor R 54 And a second series circuit of a short signal diode D52 for small signals and a resistor R52 connected in parallel with each other.
- the light-emitting diode PC2 corresponds to the light-emitting device of the present invention and is a part of the photocabler.
- the Schottky barrier diode D52 is composed of silicon or a group 315 compound semiconductor and a Schottky parier electrode, and has a rectification characteristic of the Schottky parrier.
- the power source of this Schottkin diode D52 is connected to the positive voltage output terminal of the rectifying and smoothing circuit 7 (that is, the DC output terminal 8a) so as to be reverse-biased.
- 2 and the light emitting diode PC 2 are connected to the negative voltage output terminal of the rectifying and smoothing circuit 7 (that is, the DC output terminal 8 b).
- the reverse leakage current of the short-circuit diode D52 that is, the reverse current Ir rapidly increases in a specific temperature range, for example, 110 to 130 ° C.
- the specific temperature range of 110 to 130 ° C. in which the reverse current Ir of the Schottky diode D52 rapidly increases corresponds to the temperature at which the overheat protection starts.
- the specific temperature range of 110 ° C to 130 ° C at which the reverse current Ir of the short-circuit diode D52 rapidly changes is a desirable value as a temperature for preventing smoke and ignition.
- the short cut diode D52 is located anywhere in the power supply case or at or near a location that may overheat.
- the Schottky diode D52 is connected to the mains of the power supply.
- the current is thermally coupled to the flowing rectifier diode D51.
- the Schottky barrier diode D 52 and the rectifying diode D 51 are mechanically integrated through a highly thermally conductive support 29, thereby forming the composite part 28. Make up.
- the Schottky diode D52 and the rectifying diode D51 may be integrated by an insulating enclosure.
- the composite part 28 may be configured using a well-known TO-22 or TO-3P package.
- a rectifying / smoothing circuit 9 for a control power supply is connected to the auxiliary winding N 3 of the transformer 5.
- the rectifying and smoothing circuit 9 includes a rectifying diode D4 and a smoothing capacitor C3.
- the smoothing capacitor C3 is connected in parallel with the auxiliary winding N3 via the rectifier diode D4.
- the polarities of the rectifier diode D 4 and the auxiliary winding N 3 are determined so that the rectifier diode D 4 conducts while the switch Q 1 is off.
- a control circuit 12 is connected to a control terminal (gate) of the switch Q1 in order to perform on / off control of the switch Q1.
- the control circuit 12 has a first power supply terminal 13 and a second power supply terminal 14 to which a control power supply voltage is supplied, and an output terminal 15 that outputs a PWM (pulse with modulation) control signal.
- the PWM control signal from 15 is supplied to the control terminal of switch Q1.
- a control power supply capacitor C 2 is provided to supply a DC voltage to the control circuit 12 .
- One end and the other end of the control power supply capacitor C 2 are connected to the first power supply terminals 13 and 13 of the control circuit 12. They are connected to the second power terminals 14 respectively.
- the control power supply capacitor C2 is connected between the pair of DC lines 4a and 4b via a starting resistor R1 functioning as a starting charging circuit.
- the rectifying and smoothing circuit 9 which functions as a charging circuit after the control power supply capacitor C2 is started, is used to form the second part of the overheat and overvoltage protection device, It is connected in parallel to the control power supply capacitor C 2 via the transistor Q 2 and the diode D 1 included in the path 16 b.
- the second circuit 16b includes a phototransistor PC1, a thyristor TH1, a transistor Q2, a diode D1, a diode D2, a resistor R2, a resistor R3, a resistor R4, and a resistor R5.
- the phototransistor P C1 corresponds to the light receiving element of the present invention, and is another part of the photo power blur.
- the light emitting diode PC2 of the first circuit 16a and the phototransistor PC1 of the second circuit 16b are optically coupled.
- the thyristor TH1 corresponds to the control element of the present invention and has a conduction maintaining function.
- One main terminal (anode) of the thyristor TH1 is connected to one end of a control power supply capacitor C2 and a first power supply terminal 13 of the control circuit 12 via a resistor R3, and the other main terminal of the thyristor TH1 is connected to the other main terminal (anode).
- the terminal (force source) is connected to the other end of the control power supply capacitor C 2 and the second power supply terminal 14 of the control circuit 12.
- the collector of ⁇ ⁇ ⁇ type transistor Q2 which functions as an auxiliary switch for overheating protection and a constant voltage control element, is connected to DC line 9a, and the emitter is one end of control power supply capacitor C2 via diode D1. And the base is connected to the DC line 9a via the resistor R4.
- the control power capacitor C is connected via the starting resistor R1. 2 is charged.
- the supply of the PWM control signal from the control circuit 12 to the switch Q 1 is started.
- the rectifier diode D51 and the rectifier diode D4 are non-conductive, and energy is stored in the transformer 5.
- the energy stored in the transformer 5 is released during the off period of the switch Q1, the smoothing capacitor C51 is charged via the rectifying diode D51, and the smoothing capacitor C3 is charged via the rectifying diode D4.
- a well-known output voltage detection circuit for detecting the DC output voltage between the DC output terminals 8a and 8 is provided, and the control circuit 12 controls the output of the output voltage detection circuit. In response, it forms a PWM pulse to make the output voltage constant and supplies it to switch Q1. Therefore, the voltage between the DC output terminals 8 a and 8 b, that is, the voltage across the smoothing capacitor C 51, becomes constant, and the voltage of the smoothing capacitor C 3 of the rectifying and smoothing circuit 9 also becomes constant. .
- the transistor Q2 and the diode D1 as auxiliary switches conduct, and the control power supply capacitor C2 rectifies and smoothes. Is charged by the output voltage of
- the short cut diode D 52 is connected between the pair of DC output terminals 8 a and 8 b via a resistor R 52 and a light emitting diode PC 2 so as to be reverse biased. .
- a predetermined temperature for example, 120 ° C
- the current of the phototransistor PC1 also increases, and a trigger current flows through the thyristor TH1.
- the trigger current of the thyristor TH1 is injected from the gate of the thyristor TH1 to the force source via the phototransistor PC1, turning on the thyristor TH1.
- the thyristor THI keeps the on state until the current becomes equal to or less than the holding current.
- the thyristor T H1 When the thyristor T H1 is turned on based on the detection of overheating of the Schottky diode D 52, the diode D 2 is forward-biased and turned on, and the transistor Q 2 is turned off. As a result, the charging current supplied from the rectifying and smoothing circuit 9 to the control power supply capacitor C2 is cut off. At the same time, the thyristor TH1 short-circuits both ends of the control power capacitor C2 via the resistor R3, so that the electric charge of the control power capacitor C2 is discharged through the resistor R3 and the thyristor TH1.
- the overheat protection state is maintained until the AC input terminals 1a and 1b are disconnected from the AC power supply 1 or the power switch (not shown) is turned off.
- the thyristor TH1 is also turned off. If the overheat condition is resolved, the thyristor TH1 is kept off even if the power supply from the AC power supply 1 is restarted, so that the overheat protection by the short-circuit diode D52 can be performed. Become.
- the light emitting diode PC2 emits light, so that the phototransistor PC1 also conducts, and a trigger current flows through the thyristor TH1.
- the thyristor T H1 is turned on, the on / off operation of the switch Q1 is stopped, and the load 8 is protected from overvoltage.
- the overheat protection can be achieved by using the relatively inexpensive Schottky diode D52 for small signals as a temperature detection element, so that the power supply device is low. Cost and size can be reduced.
- the thyristor TH1 forms a discharge circuit for the control power supply capacitor C2 and turns off the transistor Q2 to cut off the charging current, quick overheat protection can be achieved.
- the overheating and overvoltage protection circuit is implemented by sharing the light emitting diode PC2.
- the cost can be significantly reduced.
- the rectifying diode D 51 and the short circuit diode D 52 are configured as an integrated composite part, the thermal coupling between the two can be made denser, and the thermal coupling can be accurately performed. Can be done.
- the power supply of the second embodiment is an improvement of the power supply of the first embodiment described above.
- the detection of the reverse current Ir of the short-circuit diode D52 is performed on the primary side via the photo-power blur (light emitting diode PC2 and phototransistor PC1). Can be considered.
- the detection result of the reverse current Ir of the Schottky barrier diode D52 is greatly influenced by the current transfer ratio (CTR) of the photo-force bra.
- CTR current transfer ratio
- the CTR of a photo bra is highly variable. Therefore, in the power supply device of the first embodiment configured as described above, the overheat protection level (latch temperature) varies. In addition, since the CTR varies depending on the temperature and the forward current, setting the latch temperature becomes extremely difficult.
- the current flowing through the light emitting diode PC 2 is the sum of the reverse current I r of the Schottky diode D 52 and the current flowing through the zener diode D 53,
- the overvoltage protection level (latch voltage) changes due to a change in the reverse current Ir of the shot diode D52 due to temperature.
- the power supply device has a configuration in which the overheat protection circuit is configured not to be affected by the CTR of the photocoupler to solve the problems of the power supply device according to the first embodiment.
- the reverse current Ir of the short-circuit diode D52 detects the overvoltage of the overvoltage protection circuit.
- the configuration does not affect the current flowing through the zener diode D53.
- FIG. 4 is a circuit diagram showing a configuration of the power supply device according to the second embodiment. Note that the same or corresponding portions as those of the power supply device of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted or simplified.
- the configuration and operation of the first circuit 16a1 are different from those of the first circuit 16a of the first embodiment. That is, the first circuit 16a1 is composed of a series circuit including a Schottky diode D52, a resistor R52, and a resistor R51 connected in series between the DC output terminals 8a and 8b, A series circuit consisting of a light emitting diode PC 2 connected in series between the DC output terminals 8a and 8b, a resistor R54 and a diode diode D53, and a light emitting diode PC2 connected in parallel to the light emitting diode PC2. It is composed of a resistor R53 and a comparator Z51.
- the inverting input terminal (1) of the comparator Z51 is connected to the connection point between the resistors R52 and R51, and the non-inverting input terminal (+) is connected to the power supply that supplies the reference voltage Vref. ing.
- the output terminal of the comparator Z51 is connected to the connection point between the resistor R54 and the Zener diode D53.
- the cathode of the Schottky diode D52 is connected to the DC output terminal 8a so as to be reverse biased.
- the light emitting diode PC 2 is a part of the photo power blur, and corresponds to the light emitting device of the present invention. Next, the operation of the power supply device according to the second embodiment will be described.
- the reverse current Ir of the Schottky diode D52 flows into the light emitting diode PC2. Absent. Therefore, when the first circuit 16a1 functions as an overvoltage protection circuit, it is not affected by the reverse current Ir.
- the Zener diode D53 allows a current to flow through the light emitting diode PC2 when the voltage between the DC output terminals 8a and 8b becomes larger than a predetermined breakdown voltage.
- the overheat and overvoltage protection circuits are not affected by the CTR of the photo power blur. Since the reverse current Ir of the Schottky diode D52 that detects overheating does not affect the current flowing through the zener diode D53 that detects overvoltage, the overheat protection level (latch temperature) and the overvoltage protection level (Latch voltage) can be set accurately.
- the power supply device of the third embodiment can be replaced by a transistor in which the comparator Z51 included in the first circuit 16a1 of the power supply device of the second embodiment is replaced by a transistor.
- FIG. 5 is a circuit diagram showing a configuration of a power supply device according to the third embodiment.
- the same or corresponding parts as those of the power supply device according to the second embodiment are denoted by the same reference numerals, and the description is omitted or simplified.
- the first circuit 16a2 of the power supply is composed of a short-circuit diode D52, a resistor R52, and a resistor R52 connected in series between the DC output terminals 8a and 8b.
- 5 a series circuit composed of a light emitting diode PC 2 and a zener diode D 5 3 connected in series between the DC output terminals 8 a and 8 b, and a light emitting diode PC 2 in parallel with the light emitting diode PC 2.
- It comprises a connected resistor R53 and a series circuit composed of a resistor R54 connected in parallel with the Zener diode D53 and an npn transistor Q51.
- the base of transistor Q51 is connected to the connection point between resistors R52 and R51.
- the cathode of the Schottky rear diode D52 is connected to the DC output terminal 8a so as to be a reverse bias.
- the light emitting diode PC2 is a part of the photo power blur, and corresponds to the light emitting device of the present invention.
- the operation of the power supply device will be described.
- the temperature of the Schottky rear diode D52 increases and the reverse current Ir increases, the voltage generated in the resistor R51 increases.
- this voltage becomes equal to or higher than the base-emitter threshold voltage of the transistor Q51, the transistor Q51 is turned on.
- a current flows through the light emitting diode PC2 to emit light, and the thyristor TH1 is turned on by the same operation as the power supply device of the first embodiment, and the operation of the control circuit 12 is stopped.
- the voltage across the resistor R51 When the transistor Q51 is smaller than the base-emitter threshold voltage of the transistor Q51, the transistor Q51 is off, and the reverse current Ir of the Schottky diode D52 does not flow into the light emitting diode PC2. Therefore, when the first circuit 16a1 functions as an overvoltage protection circuit, it is not affected by the reverse current Ir.
- the Zener diode D53 allows a current to flow through the light emitting diode PC2 when the voltage between the DC output terminals 8a and 8b becomes larger than a predetermined breakdown voltage.
- the transistor Q51 is used instead of the comparator Z51. There is no need to generate the voltage V ref, and the circuit configuration is simplified.
- the power supply according to the fourth embodiment is configured such that the transistor Q51 included in the first circuit 16a2 of the power supply according to the third embodiment is removed, and the light emitting diode PC2 is set to the negative voltage side (DC output terminal 8b side). Connected to.
- FIG. 6 is a circuit diagram showing the configuration of the power supply device according to the fourth embodiment.
- the same or corresponding portions as those of the power supply device according to the third embodiment are denoted by the same reference numerals, and description thereof will be omitted or simplified.
- the first circuit 16a3 of the power supply device includes a Schottky diode D52, a resistor R52, and a resistor R5 connected in series between the DC output terminals 8a and 8b. 1, a zener diode D53, a resistor R54, and a light emitting diode connected in series between the DC output terminals 8a and 8b. And a series circuit composed of an electronic PC 2.
- the connection point between the resistor R52 and the resistor R51 is connected to the connection point between the resistor R54 and the light emitting diode PC2.
- the cathode of the Schottky barrier diode D52 is connected to the DC output terminal 8a so as to form an inverse bias.
- the light emitting diode PC2 is a part of the photo power blur, and corresponds to the light emitting element of the present invention.
- the operation of the power supply device will be described.
- the temperature of the short-circuit diode D52 rises and the reverse current Ir increases, and the voltage generated at the resistor R51 exceeds the forward threshold voltage of the light-emitting diode PC2, the light-emitting diode PC2 is turned on. Electric current flows to emit light. Thereby, the thyristor TH1 is turned on by the same operation as the power supply device of the first embodiment, and the operation of the control circuit 12 is stopped.
- the Zener diode D53 allows a current to flow through the light emitting diode PC2 when the voltage between the DC output terminals 8a and 8b becomes larger than a predetermined breakdown voltage.
- the power supply device of the fourth embodiment since active elements such as a comparator and a transistor are unnecessary, it is possible to further reduce the cost and size of the power supply device.
- the power supply device includes a connection point of the first circuit 16a3 of the power supply device of the fourth embodiment between the resistor R52 and the resistor R51, the resistor R54 and the light emitting diode PC.
- Diode D54 is introduced between the point of connection with 2.
- the Zener diode D53 and the resistor R54 are connected to the light emitting diode PC 2 from the DC output terminal 8a side.
- FIG. 7 is a circuit diagram showing a configuration of a power supply device according to the fifth embodiment. Note that the same or corresponding portions as those of the power supply device of the fourth embodiment are denoted by the same reference numerals, and description thereof will be omitted or simplified.
- the first circuit 16a4 of the power supply device is composed of a short-circuit diode D52, a resistor R52, and a resistor R51 connected in series between the DC output terminals 8a and 8b.
- a series circuit composed of a zener diode D53, a resistor R54, and a light emitting diode PC2 connected in series between the DC output terminals 8a and 8b; and a resistor R5.
- a node is connected to the connection point between the resistor 2 and the resistor R 5 1, a diode D 5 4 whose cathode is connected to a connection point between the resistor R 4 and the light emitting diode PC 2, and a light emitting diode PC 2 are connected in parallel.
- the Schottky barrier diode D52 has its power source connected to the DC output terminal 8a so as to be reverse biased.
- the light emitting diode PC2 is a part of the photocoupler and corresponds to the light emitting device of the present invention. Next, the operation of the power supply device according to the fifth embodiment will be described. When the temperature of the Schottky barrier diode D 52 increases and the reverse current Ir increases, and the voltage generated at the resistor R 51 becomes equal to or greater than the sum of the forward threshold voltages of the diode D 54 and the light emitting diode PC 2, A current flows through the light emitting diode PC 2 to emit light.
- the thyristor TH1 is turned on by the same operation as the power supply device of the first embodiment, and the operation of the control circuit 12 is stopped. Also, when the DC voltage output from the pair of DC output terminals 8a and 8b becomes overvoltage state and the zener diode D53 is turned on, the zener diode D53 passes through the zener diode D53 to the resistor R53. Electric current flows. When the voltage generated in the resistor R53 becomes equal to or higher than the forward threshold voltage of the light emitting diode PC2, a current flows through the light emitting diode PC2 to emit light. Thus, the thyristor TH1 is turned on by the same operation as the power supply device of the first embodiment, and the operation of the control circuit 12 is stopped.
- the diode D53 allows a current to flow through the light emitting diode PC2 when the voltage between the DC output terminals 8a and 8b becomes higher than a predetermined breakdown voltage.
- the power supply device of the fifth embodiment when the voltage generated at the resistor R51 is equal to or less than the sum of the forward threshold voltages of the diode D54 and the light emitting diode PC2, the Schottky barrier diode Since the reverse current Ir of the diode D52 does not flow through the light emitting diode PC2, when the first circuit 16a4 functions as an overvoltage protection circuit, the reverse current Ir is not affected.
- the power supply device includes a rectifier smoother instead of thermally coupling the Schottky diode D52 included in the first circuit 16a1 of the power supply device according to the second embodiment to the rectifier diode D51. It is thermally coupled to a resistor R55 inserted in the output line of circuit 7.
- FIG. 8 is a circuit diagram showing a configuration of a power supply device according to the sixth embodiment. The same or corresponding parts as those of the power supply device according to the second embodiment are denoted by the same reference numerals, and the description is omitted or simplified.
- the resistor R55 is connected in series between one end of the smoothing capacitor C51 and the positive voltage DC output terminal 8a. Therefore, the main current of the power supply, that is, the load current flows through the resistor R55.
- a pair of current detection lines are connected to both terminals of the resistor R55, and a pair of current detection lines are connected to the control circuit 12.
- the control circuit 12 controls the switch Q 1 to reduce the current output from the pair of DC output terminals 8 a and 8 b to a predetermined value or less when the current flowing through the resistor R 55 exceeds a predetermined value. Control.
- the short-circuit diode D52 is thermally coupled to the resistor R55, it is the same as when the rectifier diode D51 in the power supply of the second embodiment (see FIG. 4) is overheated.
- the resistor R55 is overheated, the thyristor TH1 is turned on and the switch Q1 is turned off, and the overheat protection is achieved.
- the Schottky barrier diode D 52 and the resistor R 55 are combined into a mechanically integrated composite part 31 as shown in FIG. 9 in order to make the thermal coupling accurate and tight. I have.
- the short-circuit diode D52 and the resistor R55 may be integrated with each other by an insulating enclosure.
- the composite component 31 may be configured using a well-known package of T O — 220 or T O — 3 P.
- the same operation and effects as those of the power supply device of the second embodiment are exhibited.
- the power supply according to the seventh embodiment is the same as the first circuit 16 of the power supply according to the third embodiment.
- the Schottky diode D 52 included in a 2 is thermally coupled to the resistor R 55 inserted into the output line of the rectifying and smoothing circuit 7 instead of being thermally coupled to the rectifying diode D 51. .
- FIG. 10 is a circuit diagram showing the configuration of the power supply device according to the seventh embodiment.
- the same or corresponding portions as those of the power supply device according to the third embodiment are denoted by the same reference numerals, and description thereof will be omitted or simplified.
- the resistor R55 is connected in series between one end of the smoothing capacitor C51 and the positive voltage DC output terminal 8a. Therefore, the main current of the power supply, that is, the load current flows through the resistor R55.
- a pair of current detection lines is connected to both terminals of the resistor R55, and the pair of current detection lines is connected to the control circuit 12.
- the control circuit 12 sets the switch Q1 so as to reduce the current output from the pair of DC output terminals 8a and 8b to a predetermined value or less when the current flowing through the resistor R55 exceeds a predetermined value. Control.
- the Schottky diode D52 is thermally coupled to the resistor R55, as in the case where the rectifier diode D51 in the power supply of the third embodiment (see FIG. 5) is overheated.
- the resistor R55 is overheated, the thyristor TH1 is turned on and the switch Q1 is turned off, and the overheat protection is achieved.
- the short-circuit diode D52 and the resistor R55 are, like the sixth embodiment, mechanically integrated composite parts as shown in FIG. 3 1 can be configured. According to the power supply device of the seventh embodiment, the same operations and effects as those of the power supply device of the third embodiment are exhibited.
- the power supply according to the eighth embodiment is the same as the first circuit 16 of the power supply according to the fourth embodiment. Instead of thermally coupling the short-circuit diode D52 included in a3 to the rectifier diode D51, it thermally couples to the resistor R55 inserted into the output line of the rectifier smoothing circuit 7. It is a thing.
- FIG. 11 is a circuit diagram showing the configuration of the power supply device according to the eighth embodiment. Note that the same or corresponding portions as those of the power supply device of the fourth embodiment are denoted by the same reference numerals, and description thereof will be omitted or simplified.
- the resistor R55 is connected in series between one end of the smoothing capacitor C51 and the positive voltage DC output terminal 8a. Therefore, the main current of the power supply, that is, the load current flows through the resistor R55.
- a pair of current detection lines are connected to both terminals of the resistor R 55, and the pair of current detection lines is connected to the control circuit 12.
- the control circuit 12 sets the switch Q1 so as to reduce the current output from the pair of DC output terminals 8a and 8b to a predetermined value or less when the current flowing through the resistor R55 exceeds a predetermined value. Control.
- the short-circuit diode D52 is thermally coupled to the resistor R55, it is the same as when the rectifier diode D51 in the power supply device of the fourth embodiment (see FIG. 6) is overheated.
- the resistor R55 is overheated, the thyristor TH1 is turned on and the switch Q1 is turned off, and the overheat protection is achieved.
- the Schottky barrier diode D52 and the resistor R55 are mechanically integrated as shown in FIG. 9 in the same manner as in the sixth embodiment. Parts 31 can be configured. According to the power supply device of the eighth embodiment, the same operation and effect as those of the power supply device of the fourth embodiment can be obtained.
- the power supply according to the ninth embodiment is the same as the first circuit 16 of the power supply according to the fifth embodiment.
- the Schottky diode D 52 included in a 4 is thermally coupled to the resistor R 55 inserted into the output line of the rectifying and smoothing circuit 7 instead of being thermally coupled to the rectifying diode D 51. .
- FIG. 12 is a circuit diagram showing the configuration of the power supply device according to the ninth embodiment.
- the same or corresponding parts as those of the power supply device according to the fifth embodiment are denoted by the same reference numerals, and description thereof will be omitted or simplified.
- the resistor R55 is connected in series between one end of the smoothing capacitor C51 and the positive voltage DC output terminal 8a. Therefore, the main current of the power supply, that is, the load current flows through the resistor R55.
- a pair of current detection lines are connected to both terminals of the resistor R 55, and the pair of current detection lines is connected to the control circuit 12.
- the control circuit 12 controls the switch Q 1 to reduce the current output from the pair of DC output terminals 8 a and 8 b to a predetermined value or less when the current flowing through the resistor R 55 exceeds a predetermined value. Control.
- the short-circuit diode D52 is thermally coupled to the resistor R55, it is similar to the case where the rectifier diode D51 in the power supply of the fifth embodiment (see FIG. 7) is overheated.
- the resistor R55 is overheated, the thyristor TH1 is turned on and the switch Q1 is turned off, and the overheat protection is achieved.
- the Schottky rear diode D52 and the resistor R55 are mechanically integrated as shown in FIG. 9 as in the sixth embodiment.
- Composite part 31 can be configured. According to the power supply of the ninth embodiment, the same operations and effects as those of the power supply of the fifth embodiment are achieved.
- the present invention is not limited to the above-described first to ninth embodiments.
- the Schottky rear diode D 52 includes a current detection resistor (not shown) connected in series with the primary winding N 1, a diode included in the diode bridge rectifier circuit 3, a smoothing capacitor C l, and a control power supply. Can be thermally coupled to the capacitor C2.
- the composite component 28 shown in FIG. 3 can be used.
- the composite component 31 shown in FIG. 9 can be used.
- a plurality of Schottky barrier diodes are connected in parallel in place of one Schottky barrier diode D52, and each of the plurality of Schottky barrier diodes is connected to a resistor, diode, and capacitor included in the power supply. Etc. can be thermally coupled.
- a plurality of secondary windings N2 are provided in the transformer 5 to supply power to a plurality of loads, and a load circuit equivalent to the first circuit 16a is provided for each load circuit.
- the optical output of the plurality of first circuits 16a can be provided to one phototransistor PC1.
- Another control switch element or control switch circuit having a holding function can be used instead of the thyristor TH1 as a control element.
- the present invention is applicable not only to the power supply devices of the first to ninth embodiments but also to all electric circuit devices.
- the whole or a part of the first circuit 16a and the second circuit 16b constituting the overheat and overvoltage protection circuit can be integrally formed as one component.
- any device whose reverse leakage current varies with temperature such as a first trickary diode (FRD), can be used instead of the Schottky diode D52.
- FBD first trickary diode
- the cost can be significantly reduced, and a power supply capable of accurately setting the overheat protection level (latch temperature) and the overvoltage protection level (latch voltage).
- An apparatus can be provided.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US10/520,607 US7315461B2 (en) | 2003-01-28 | 2004-01-09 | Power supply device |
JP2005504664A JPWO2004068686A1 (ja) | 2003-01-28 | 2004-01-09 | 電源装置 |
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JP2003-018778 | 2003-01-28 | ||
JP2003018778 | 2003-01-28 |
Publications (1)
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WO2004068686A1 true WO2004068686A1 (ja) | 2004-08-12 |
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PCT/JP2004/000089 WO2004068686A1 (ja) | 2003-01-28 | 2004-01-09 | 電源装置 |
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US (1) | US7315461B2 (ja) |
JP (1) | JPWO2004068686A1 (ja) |
CN (1) | CN100405725C (ja) |
WO (1) | WO2004068686A1 (ja) |
Cited By (5)
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JP2007135347A (ja) * | 2005-11-11 | 2007-05-31 | Mitsubishi Electric Corp | 電源装置及びそれを用いたシーケンサシステム |
KR100870976B1 (ko) | 2005-12-20 | 2008-12-01 | 산켄덴키 가부시키가이샤 | 전원장치의 과열보호회로 및 직류전원장치 |
JP2009170864A (ja) * | 2007-12-17 | 2009-07-30 | Sanken Electric Co Ltd | 複合半導体装置 |
WO2013098015A2 (en) | 2011-12-26 | 2013-07-04 | Arcelik Anonim Sirketi | A household appliance protected from mains over voltage |
JP2014064376A (ja) * | 2012-09-20 | 2014-04-10 | Fuji Electric Co Ltd | スイッチング電源装置 |
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JP6371543B2 (ja) * | 2014-03-14 | 2018-08-08 | エイブリック株式会社 | 過熱保護回路及びボルテージレギュレータ |
US9466974B2 (en) * | 2014-04-30 | 2016-10-11 | Dell Products L.P. | Systems and methods for inductive overvoltage protection of PFC bulk capacitors in power supplies |
ITMI20150543A1 (it) * | 2015-04-15 | 2016-10-15 | Costr Elettromeccaniche P Torresan S R L | Regolatore di tensione in derivazione di protezione di un carico elettrico da sovratensioni e transitori di tensione |
JP6559343B2 (ja) * | 2016-05-25 | 2019-08-14 | 三菱電機株式会社 | スイッチング電源回路 |
JP6796204B2 (ja) | 2016-11-17 | 2020-12-02 | テーデーカー エレクトロニクス アーゲー | 低減された不所望な共振を伴う絶縁トランス、絶縁トランスを有するエネルギー変換器、絶縁トランスを有する無線エネルギー伝送のためのエネルギー変換器 |
KR20180093451A (ko) * | 2017-02-13 | 2018-08-22 | 삼성전자주식회사 | 전력 소모를 감소한 역전압 모니터링 회로 및 이를 포함하는 반도체 장치 |
CN109600043A (zh) * | 2017-09-29 | 2019-04-09 | 台达电子工业股份有限公司 | 电源转换装置以及稳压回馈电路 |
DE102017126696A1 (de) * | 2017-11-14 | 2019-05-16 | Infineon Technologies Austria Ag | Spannungswandlersteuerung, Spannungswandler und Verfahren zum Betreiben eines Spannungswandlers |
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JP2007135347A (ja) * | 2005-11-11 | 2007-05-31 | Mitsubishi Electric Corp | 電源装置及びそれを用いたシーケンサシステム |
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KR100870976B1 (ko) | 2005-12-20 | 2008-12-01 | 산켄덴키 가부시키가이샤 | 전원장치의 과열보호회로 및 직류전원장치 |
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WO2013098015A2 (en) | 2011-12-26 | 2013-07-04 | Arcelik Anonim Sirketi | A household appliance protected from mains over voltage |
JP2014064376A (ja) * | 2012-09-20 | 2014-04-10 | Fuji Electric Co Ltd | スイッチング電源装置 |
Also Published As
Publication number | Publication date |
---|---|
CN1698257A (zh) | 2005-11-16 |
US7315461B2 (en) | 2008-01-01 |
US20060056205A1 (en) | 2006-03-16 |
CN100405725C (zh) | 2008-07-23 |
JPWO2004068686A1 (ja) | 2006-05-25 |
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