CN204538973U - A kind of reverse exciting switching voltage regulator with protective circuit - Google Patents
A kind of reverse exciting switching voltage regulator with protective circuit Download PDFInfo
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- CN204538973U CN204538973U CN201520047131.5U CN201520047131U CN204538973U CN 204538973 U CN204538973 U CN 204538973U CN 201520047131 U CN201520047131 U CN 201520047131U CN 204538973 U CN204538973 U CN 204538973U
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Abstract
The utility model relates to a kind of reverse exciting switching voltage regulator with protective circuit, comprise voltage reference circuit, voltage controller, current controller and PWM generative circuit, main circuit, DC bus, primary current sample circuit and output voltage sampling circuit, also comprise protective circuit, described protective circuit comprises buffer circuit, output overcurrent protective circuit, output overvoltage protection circuit, transformer overheating protection circuit and input voltage abnormity protection circuit, the input of output overcurrent protective circuit is connected to the output current sampling end of main circuit, the input of output overvoltage protection circuit is connected to the voltage output end of main circuit, transformer overheating protection circuit input termination one power supply, output overcurrent protective circuit, output overvoltage protection circuit and transformer overheating protection circuit output are connected to buffer circuit input through diode respectively, input voltage abnormity protection circuit input termination DC bus output, its output and buffer circuit output are connected to voltage controller output.Improve output voltage precision, accelerate the change response speed to load.
Description
Technical field
The utility model relates to a kind of reverse exciting switching voltage regulator, is specifically related to a kind of reverse exciting switching voltage regulator with protective circuit.
Background technology
Switching Power Supply is described as energy-efficient power supply, has now become the main product of stabilized voltage power supply, and Switching Power Supply adopts power semiconductor as switching device, and by work periodically indirectly, the duty ratio of control switch device carrys out regulation output voltage.
The advantages such as reverse exciting switching voltage regulator is simple with its structure, components and parts are few are used widely in the equipment of automatic control, intelligent instrument etc.The main operational principle of reverse exciting switching voltage regulator is: when metal-oxide-semiconductor is opened, transformer primary side storage power, during shutoff, the energy of storage is sent to transformer secondary, obtains required voltage after capacitor filtering.Traditional voltage-type reverse exciting switching voltage regulator compresses into row FEEDBACK CONTROL from transformer inputs power taking, and structure is simple, cost is low, be easy to realization.But; voltage-type reverse exciting switching voltage regulator does not gather output voltage, controls, and makes its output voltage precision not high, fast not to the change response speed of load; can not provide during operation irregularity and protect timely, unnecessary loss may be caused to power supply itself and load thereof.
Summary of the invention
For the problems referred to above, the utility model provides the reverse exciting switching voltage regulator with protective circuit that a kind of output accuracy is high, load applicability is strong.
For solving the problem, the technical scheme that the utility model is taked is: a kind of reverse exciting switching voltage regulator with protective circuit, comprise voltage reference circuit, voltage controller, current controller and PWM generative circuit, main circuit, DC bus, primary current sample circuit and output voltage sampling circuit, the in-phase input end of voltage controller is connected to the output Uref of voltage reference circuit, its inverting input is connected to the output Uf of output voltage sampling circuit, and its output Ucomp is connected with the first input end of current controller and PWM generative circuit, second input of current controller and PWM generative circuit is connected to the output If of primary current sample circuit, the output of current controller and PWM generative circuit is connected with the PWM input PWM of main circuit, the direct-flow input end Ui of main circuit is connected with the output of DC bus, the primary current output Is of main circuit is connected with the input of primary current sample circuit, its voltage output end Uo is connected to the input of output voltage sampling circuit simultaneously as sampled voltage as power supply, also comprise protective circuit, described protective circuit comprises buffer circuit, output overcurrent protective circuit, output overvoltage protection circuit, transformer overheating protection circuit and input voltage abnormity protection circuit, the input of output overcurrent protective circuit is connected to the output current sampling end of main circuit, the input of output overvoltage protection circuit is connected to the voltage output end Uo of main circuit, transformer overheating protection circuit input termination one power supply, output overcurrent protective circuit, output overvoltage protection circuit and transformer overheating protection circuit output are connected to buffer circuit input through diode respectively, input voltage abnormity protection circuit input termination DC bus output, its output and buffer circuit output are connected to voltage controller output Ucomp.
Described main circuit comprises the transformer that has one group of former limit winding and four groups of vice-side winding, former limit winding input is connected with the output of DC bus as the direct-flow input end of main circuit, export the drain electrode of termination NMOS field effect transistor, its grid drives resistance to be connected with the output of current controller and PWM generative circuit as the PWM input of main circuit through one, and its source electrode is connected to the input of primary current sample circuit as the primary current output of main circuit; In four vice-side winding loops, string has one for the switching diode of rectification respectively, and the first vice-side winding, after switching diode rectification, obtains direct current and exports after a filter capacitor being parallel with voltage stabilizing didoe; The output loop of the second vice-side winding and the 3rd vice-side winding is respectively in series with a current sampling resistor, first, second sampling end of output current of drawing main circuit is respectively connected to the input of output overcurrent protective circuit, and the second vice-side winding output is connected to the input of output overvoltage protection circuit as voltage output end; 4th secondary winding loop connects one for stablizing the three terminal regulator of its output voltage; Altogether, the second vice-side winding, the 3rd vice-side winding and the 4th vice-side winding are altogether and isolate with former limit winding and the first vice-side winding for former limit winding and the first vice-side winding.
Described output overcurrent protective circuit is such: comparator in-phase input end ground connection, inverting input is connected to 2.5V reference voltage through divider resistance, output current first sampling end being simultaneously connected to main circuit through divider resistance provides overcurrent protection for the second vice-side winding, the output of comparator is connected to diode anode, and diode cathode is connected to buffer circuit; Comparator in-phase input end ground connection; inverting input is connected to 2.5V reference voltage through divider resistance; output current second sampling end that divider resistance simultaneously through being parallel with filter capacitor is connected to main circuit provides overcurrent protection for the 3rd vice-side winding; the output of comparator is connected to the in-phase input end of comparator; the anti-phase input termination 2.5V reference power supply of comparator, comparator output terminal is connected to buffer circuit through diode.Described output overvoltage protection circuit is such: comparator anti-phase input termination 2.5V reference voltage; in-phase input end is through being parallel with the divider resistance ground connection of filter capacitor; connect main circuit voltage output end through divider resistance simultaneously; comparator output terminal connects diode anode, and diode cathode is connected to buffer circuit.
Described transformer overheating protection circuit is such: comparator in-phase input end connects 2.5V reference power supply; inverting input is through being parallel with the divider resistance ground connection of filter capacitor; simultaneously through divider resistance series connection one be fixed on magnetic core of transformer for gather magnetic core of transformer temperature thermistor after connect 15V power supply; comparator output terminal connects diode anode, and diode cathode is connected to buffer circuit.Input voltage abnormity protection circuit comprises protection reference circuit, input open-phase protection circuit and input undervoltage protection circuit, and protection reference circuit comprises the voltage stabilizing didoe that is parallel with filter capacitor, and voltage stabilizing didoe connects DC bus output through current-limiting resistance; Input open-phase protection circuit comprises a comparator, and comparator anti-phase input is connected to the protection benchmark realized by divider resistance, and comparator in-phase input end is through triode input phase failure detection signal, and comparator is connected to the anode of diode through scale base circuit; Input undervoltage protection circuit comprises comparator; its anti-phase input is connected to the protection benchmark realized by divider resistance; its in-phase input end is a scale base circuit, and its output is connected to the anode of diode, and the negative electrode of diode and diode is all connected to buffer circuit through triode.
Current controller and PWM generative circuit adopt integrated chip to realize, and former limit sample circuit carries out sampling through sampling resistor to primary current and is connected to current controller second input.
Described voltage controller, comprise a pi controller and an isolation photoelectric coupled circuit, the input of proportional integrator is the input of voltage controller, the output of pi controller is connected with the input of isolation photoelectric coupled circuit, isolate the output of output as voltage controller of photoelectric coupled circuit, output voltage sampling circuit is that main circuit output voltage is connected to pi controller inverting input after divider resistance dividing potential drop.
Described DC bus is such: three-phase alternating current input is connected to one end of three fuses respectively after three binding posts, three fuses are connected respectively and are connect three open-phase protections after three current-limiting resistances and detect resistance one end, input phase failure detection signal is obtained after three open-phase protections detect the other end short circuit of resistance, in addition the 3rd current-limiting resistance is connected to the first ac input end of the first rectifier bridge and the second rectifier bridge, second current-limiting resistance is connected to the second ac input end of the second rectifier bridge, first current-limiting resistance is connected to the second ac input end of the first rectifier bridge, obtain level and smooth direct current through electrochemical capacitor after two rectifier bridge output-parallels to export.
Described reference circuit generates stable output voltage by voltage stabilizing didoe or three-terminal voltage regulator, for voltage controller provides stable voltage reference.
The utility model take output voltage as sampling control signal, be given voltage with a reference source, make reverse exciting switching voltage regulator controller can adjust duty ratio rapidly, accurately according to the change of output voltage and load, thus make that output voltage precision is higher, workload-adaptability is better.
In addition; increase input undervoltage, input phase failure, output overvoltage, output overcurrent, transformer overheating protection circuit; the PWM output signal of reverse exciting switching voltage regulator controller can be cut off rapidly when above Arbitrary Fault occurs; power supply is stopped to export; improve the reliability of work, fail safe, avoid the infringement to power supply itself and load thereof.
The utility model can gather output voltage by arranging protective circuit, control; improve output voltage precision high; accelerate the change response speed to load, can provide during operation irregularity and protect timely, decrease and unnecessary loss is caused to power supply itself and load thereof.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model;
Fig. 2 is the main circuit schematic diagram of the utility model embodiment 1;
Fig. 3 is the protective circuit schematic diagram of the utility model embodiment 1;
Fig. 4 is the schematic diagram of the current controller of the utility model embodiment 1 and PWM generative circuit, primary current sample circuit;
Fig. 5 is the voltage controller of the utility model embodiment 1 and the schematic diagram of output voltage sampling circuit;
Fig. 6 is the DC bus circuit theory diagrams of the utility model embodiment 1;
Fig. 7 is the voltage reference circuit schematic diagram of the utility model embodiment 1;
Embodiment
A kind of reverse exciting switching voltage regulator with protective circuit, as shown in Figure 1: comprise voltage reference circuit, voltage controller, current controller and PWM generative circuit, main circuit, DC bus, primary current sample circuit and output voltage sampling circuit, the in-phase input end of voltage controller is connected to the output Uref of voltage reference circuit, its inverting input is connected to the output (Uf) of output voltage sampling circuit, and its output Ucomp is connected with the first input end of current controller and PWM generative circuit, second input of current controller and PWM generative circuit is connected to the output If of primary current sampling, the output of current controller and PWM generative circuit is connected with the PWM input PWM of main circuit, the direct-flow input end Ui of main circuit is connected with the output of DC bus, the primary current output Is of main circuit is connected with the input of primary current sample circuit, its voltage output end Uo is connected to the input of output voltage sampling circuit simultaneously as sampled voltage as power supply, also comprise protective circuit, described protective circuit comprises buffer circuit, output overcurrent protective circuit, output overvoltage protection circuit, transformer overheating protection circuit and input voltage abnormity protection circuit, the input of output overcurrent protective circuit is connected to the output current sampling end Uc of main circuit, the input of output overvoltage protection circuit is connected to the voltage output end Uo of main circuit, transformer overheating protection circuit input termination one power supply, output overcurrent protective circuit, output overvoltage protection circuit and transformer overheating protection circuit output are connected to buffer circuit input through diode respectively, input voltage abnormity protection circuit input termination DC bus output, its output and buffer circuit output are connected to voltage controller output Ucomp.
As shown in Figure 2, described main circuit comprises the transformer that has one group of former limit winding and four groups of vice-side winding, former limit winding input is connected with the output of DC bus as the direct-flow input end Ui of main circuit, export termination NMOS field effect transistor Q4 drain electrode, its grid drives resistance R41 to be connected with the output of current controller and PWM generative circuit as the PWM input PWM of main circuit through one, and its source electrode is connected to the input of primary current sample circuit as the primary current output Is of main circuit; In four vice-side winding loops, string has one for switching diode D36, D32, D19, D29 of rectification respectively, and the first vice-side winding, after switching diode D36 rectification, obtains direct current and exports after a filter capacitor C27 being parallel with voltage stabilizing didoe D8; The output loop of the second vice-side winding and the 3rd vice-side winding is respectively in series with current sampling resistor R92, a R79, first, second sampling end of output current Uc1, Uc2 of drawing main circuit are respectively connected to the input of output overcurrent protective circuit, and the second vice-side winding output is connected to the input of output overvoltage protection circuit as voltage output end; 4th secondary winding loop connects one for stablizing the three terminal regulator U14 of its output voltage; Altogether, the second vice-side winding, the 3rd vice-side winding and the 4th vice-side winding are altogether and isolate with former limit winding and the first vice-side winding for former limit winding and the first vice-side winding.
As shown in Figure 3, described output overcurrent protective circuit is such: comparator U10B in-phase input end ground connection, inverting input is connected to 2.5V reference voltage through divider resistance R89, the output current first sampling end Uc1 being simultaneously connected to main circuit through divider resistance R90 provides overcurrent protection for the second vice-side winding, the output of comparator U10B is connected to diode D27 anode, and diode D27 negative electrode is connected to buffer circuit; Comparator U10A in-phase input end ground connection; inverting input is connected to 2.5V reference voltage through divider resistance R73; the output current second sampling end Uc2 that divider resistance R74 simultaneously through being parallel with filter capacitor C40 is connected to main circuit provides overcurrent protection for the 3rd vice-side winding; the output of comparator U10A is connected to the in-phase input end of comparator U2B; the anti-phase input termination 2.5V reference power supply of comparator U2B, comparator U2B output is connected to buffer circuit through diode D15.
Described output overvoltage protection circuit is such: comparator U6D anti-phase input termination 2.5V reference voltage; in-phase input end is through being parallel with the divider resistance R85 ground connection of filter capacitor C58; meet main circuit voltage output end Uo through divider resistance R86 simultaneously; comparator U6D exports terminating diode D26 anode, and diode D26 negative electrode is connected to buffer circuit.
Described transformer overheating protection circuit is such: comparator U6B in-phase input end connects 2.5V reference power supply; inverting input is through being parallel with the divider resistance R87 ground connection of filter capacitor C59; simultaneously through divider resistance R88 connect one be fixed on magnetic core of transformer for gather magnetic core of transformer temperature thermistor PT1 after connect 15V power supply; comparator U6B exports terminating diode D28 anode, and diode D27 negative electrode is connected to buffer circuit.
Input voltage abnormity protection circuit comprises protection reference circuit, input open-phase protection circuit and input undervoltage protection circuit, protection reference circuit comprises the voltage stabilizing didoe D11 that is parallel with filter capacitor C47, and voltage stabilizing didoe connects DC bus output through current-limiting resistance R16; Input open-phase protection circuit comprises a comparator U5C, comparator U5C anti-phase input is connected to the protection benchmark realized by divider resistance R75, R200, comparator U5C in-phase input end is through triode Q12 input phase failure detection signal N, and comparator U5C is connected to the anode of diode D24 through scale base circuit; Input undervoltage protection circuit comprises comparator U5B; its anti-phase input is connected to the protection benchmark realized by divider resistance R30, R37; its in-phase input end is a scale base circuit; its output is connected to the anode of diode D23, and the negative electrode of diode D23 and diode D23 is all connected to buffer circuit through triode Q10.
As shown in the figure, current controller and PWM generative circuit adopt integrated chip U5 to realize, and former limit sample circuit carries out sampling through sampling resistor R48 to primary current and is connected to current controller second input.
As shown in Figure 5, described voltage controller, comprise a pi controller and an isolation photoelectric coupled circuit, the input of proportional integrator is the input of voltage controller, the output of pi controller is connected with the input of isolation photoelectric coupled circuit, isolate the output of output as voltage controller of photoelectric coupled circuit, output voltage sampling circuit is that main circuit output voltage is connected to pi controller inverting input after divider resistance R70, R66 dividing potential drop.
As shown in Figure 6, described DC bus is such: three-phase alternating current input is respectively through three binding post J5, J6, three fuse F3 are connected to after J10, F2, one end of F1, three fuse F3, F2, F1 connects three current-limiting resistance R3 respectively, R2, connect open-phase protection after R1 and detect resistance R7, R9, R5 one end, three open-phase protections detect resistance R7, R9, input phase failure detection signal N is obtained after the other end short circuit of R5, in addition current-limiting resistance R3 is connected to first ac input end of rectifier bridge B1 and rectifier bridge B2, current-limiting resistance R2 is connected to second ac input end of rectifier bridge B2, current-limiting resistance R1 is connected to second ac input end of rectifier bridge B1, through electrochemical capacitor C15 after two rectifier bridge output-parallels, C16 obtains level and smooth direct current and exports.
As shown in Figure 7, described reference circuit generates stable output voltage by voltage stabilizing didoe or three-terminal voltage regulator, for voltage controller provides stable voltage reference.
The present embodiment AC-input voltage is the common civil power of phase three-wire three, exchange input after rectifier bridge rectification, obtain DC bus output, as shown in Figure 2, DC bus through current-limiting resistance R20 and voltage stabilizing didoe D8 for UC3842 provides initial power supply, after UC3842 starts, export pwm control signal, now output voltage is sampled as 0, and the duty ratio of pwm control signal is maximum (50%); When pwm signal is high, NMOS field effect transistor (Q4) conducting, transformer primary side flows through electric current, transformer stored energy; When pwm signal is low, NMOS field effect transistor (Q4) turns off, the conducting of transformer four secondary diode forward, and transformer releases energy, and four road output voltages start to raise; As shown in Figure 5, after output voltage sampling Uf exceedes voltage reference Uref (the present embodiment is designed to 2.5V), pi controller output voltage step-down, optocoupler U8 starts conducting, voltage controller output signal step-down; As shown in Figure 4, the duty ratio of the pwm control signal exported after the current controller through UC3842 inside, PWM generative circuit diminishes, and four road output voltages start to decline; Same, after output voltage sampling is lower than voltage reference, the pwm control signal duty ratio that PWM generative circuit exports becomes large; Go round and begin again, finally, output voltage tends towards stability, and the size of output voltage is decided by the divider resistance of reference voltage and output voltage sampling circuit; After output voltage stabilization, stable duty ratio, does not carry out the secondary 1 of voltage sample, secondary 3, secondary 4 exports same stable; By regulating the no-load voltage ratio of transformer primary, secondary, the output voltage values of secondary 1, secondary 3, secondary 4 can be regulated arbitrarily; In the present embodiment, secondary 1 output voltage+15V, secondary 2 output voltage+15V, secondary 3 output voltage-24V, secondary 4 output voltage-12V.
As shown in Figure 3, protective circuit operation principle described in the utility model is as follows: input current sampling is from the current sampling resistor of main circuit secondary, electric current is larger, sampled voltage is less, sampled voltage and voltage reference are sued for peace after divider resistance, after the voltage after summation is lower than ground level GND-3, output overcurrent protective circuit exports high level; The overheated sampling of transformer is from the thermistor PT1 be fixed on magnetic core of transformer, magnetic core temperature is higher, and thermistor PT1 resistance is larger, and the anti-phase input terminal voltage of comparator U6B is less thus, when voltage is lower than reference voltage, transformer overheating protection circuit exports high level; Output voltage sampling is obtained by divider resistance, and when sampled voltage is higher than assert during reference voltage that output voltage is too high, output overvoltage protection circuit exports high level; After guard signal uprises arbitrarily above, optocoupler U9 conducting, triode Q15 conducting, voltage controller output voltage is low level by clamper, exports and turns off; Same, when input voltage is lower than alarm limits or input phase of three-phase voltage, triode Q10 conducting, voltage controller output voltage is low level by clamper, exports and turns off.
Claims (9)
1. the reverse exciting switching voltage regulator with protective circuit, comprise voltage reference circuit, voltage controller, current controller and PWM generative circuit, main circuit, DC bus, primary current sample circuit and output voltage sampling circuit, the in-phase input end of voltage controller is connected to the output Uref of voltage reference circuit, its inverting input is connected to the output Uf of output voltage sampling circuit, and its output Ucomp is connected with the first input end of current controller and PWM generative circuit, second input of current controller and PWM generative circuit is connected to the output If of primary current sample circuit, the output of current controller and PWM generative circuit is connected with the PWM input PWM of main circuit, the direct-flow input end Ui of main circuit is connected with the output of DC bus, the primary current output Is of main circuit is connected with the input of primary current sample circuit, its voltage output end Uo is connected to the input of output voltage sampling circuit simultaneously as sampled voltage as power supply, it is characterized in that: also comprise protective circuit, described protective circuit comprises buffer circuit, output overcurrent protective circuit, output overvoltage protection circuit, transformer overheating protection circuit and input voltage abnormity protection circuit, the input of output overcurrent protective circuit is connected to the output current sampling end of main circuit, the input of output overvoltage protection circuit is connected to the voltage output end Uo of main circuit, transformer overheating protection circuit input termination one power supply, output overcurrent protective circuit, output overvoltage protection circuit and transformer overheating protection circuit output are connected to buffer circuit input through diode respectively, input voltage abnormity protection circuit input termination DC bus output, its output and buffer circuit output are connected to voltage controller output Ucomp.
2. the reverse exciting switching voltage regulator with protective circuit according to claim 1, it is characterized in that: described main circuit comprises the transformer that has one group of former limit winding and four groups of vice-side winding, former limit winding input is connected with the output of DC bus as the direct-flow input end Ui of main circuit, export termination NMOS field effect transistor Q4 drain electrode, its grid drives resistance R41 to be connected with the output of current controller and PWM generative circuit as the PWM input PWM of main circuit through one, its source electrode is connected to the input of primary current sample circuit as the primary current output Is of main circuit, in four vice-side winding loops, string has one for switching diode D36, D32, D19, D29 of rectification respectively, and the first vice-side winding, after switching diode D36 rectification, obtains direct current and exports after a filter capacitor C27 being parallel with voltage stabilizing didoe D8, the output loop of the second vice-side winding and the 3rd vice-side winding is respectively in series with current sampling resistor R92, a R79, first, second sampling end of output current Uc1, Uc2 of drawing main circuit are respectively connected to the input of output overcurrent protective circuit, and the second vice-side winding output is connected to the input of output overvoltage protection circuit as voltage output end, 4th secondary winding loop connects one for stablizing the three terminal regulator U14 of its output voltage, altogether, the second vice-side winding, the 3rd vice-side winding and the 4th vice-side winding are altogether and isolate with former limit winding and the first vice-side winding for former limit winding and the first vice-side winding.
3. the reverse exciting switching voltage regulator with protective circuit according to claim 1, it is characterized in that: described output overcurrent protective circuit is such: comparator U10B in-phase input end ground connection, inverting input is connected to 2.5V reference voltage through divider resistance R89, the output current first sampling end Uc1 being simultaneously connected to main circuit through divider resistance R90 provides overcurrent protection for the second vice-side winding, the output of comparator U10B is connected to diode D27 anode, and diode D27 negative electrode is connected to buffer circuit; Comparator U10A in-phase input end ground connection; inverting input is connected to 2.5V reference voltage through divider resistance R73; the output current second sampling end Uc2 that divider resistance R74 simultaneously through being parallel with filter capacitor C40 is connected to main circuit provides overcurrent protection for the 3rd vice-side winding; the output of comparator U10A is connected to the in-phase input end of comparator U2B; the anti-phase input termination 2.5V reference power supply of comparator U2B, comparator U2B output is connected to buffer circuit through diode D15.
4. the reverse exciting switching voltage regulator with protective circuit according to claim 1; it is characterized in that: described output overvoltage protection circuit is such: comparator U6D anti-phase input termination 2.5V reference voltage; in-phase input end is through being parallel with the divider resistance R85 ground connection of filter capacitor C58; meet main circuit voltage output end Uo through divider resistance R86 simultaneously; comparator U6D exports terminating diode D26 anode, and diode D26 negative electrode is connected to buffer circuit.
5. the reverse exciting switching voltage regulator with protective circuit according to claim 1; it is characterized in that: described transformer overheating protection circuit is such: comparator U6B in-phase input end connects 2.5V reference power supply; inverting input is through being parallel with the divider resistance R87 ground connection of filter capacitor C59; simultaneously through divider resistance R88 connect one be fixed on magnetic core of transformer for gather magnetic core of transformer temperature thermistor PT1 after connect 15V power supply; comparator U6B exports terminating diode D28 anode, and diode D28 negative electrode is connected to buffer circuit.
6. the reverse exciting switching voltage regulator with protective circuit according to claim 1, it is characterized in that: input voltage abnormity protection circuit comprises protection reference circuit, input open-phase protection circuit and input undervoltage protection circuit, protection reference circuit comprises the voltage stabilizing didoe D11 that is parallel with filter capacitor C47, and voltage stabilizing didoe connects DC bus output through current-limiting resistance R16; Input open-phase protection circuit comprises a comparator U5C, comparator U5C anti-phase input is connected to the protection benchmark realized by divider resistance R75, R200, comparator U5C in-phase input end is through triode Q12 input phase failure detection signal N, and comparator U5C is connected to the anode of diode D24 through scale base circuit; Input undervoltage protection circuit comprises comparator U5B; its anti-phase input is connected to the protection benchmark realized by divider resistance R30, R37; its in-phase input end is a scale base circuit; its output is connected to the anode of diode D23, and the negative electrode of diode D23 and diode D23 is all connected to buffer circuit through triode Q10.
7. the reverse exciting switching voltage regulator with protective circuit according to claim 1; it is characterized in that: current controller and PWM generative circuit adopt integrated chip U5 to realize, and former limit sample circuit carries out sampling through sampling resistor R48 to primary current and is connected to current controller second input.
8. the reverse exciting switching voltage regulator with protective circuit according to claim 1; it is characterized in that: described voltage controller; comprise a pi controller and an isolation photoelectric coupled circuit; the input of proportional integrator is the input of voltage controller; the output of pi controller is connected with the input of isolation photoelectric coupled circuit; isolate the output of output as voltage controller of photoelectric coupled circuit, output voltage sampling circuit is that main circuit output voltage is connected to pi controller inverting input after divider resistance R70, R66 dividing potential drop.
9. the reverse exciting switching voltage regulator with protective circuit according to claim 1, it is characterized in that: described DC bus is such: three-phase alternating current input is respectively through three binding post J5, J6, three fuse F3 are connected to after J10, F2, one end of F1, three fuse F3, F2, F1 connects three current-limiting resistance R3 respectively, R2, connect open-phase protection after R1 and detect resistance R7, R9, R5 one end, three open-phase protections detect resistance R7, R9, input phase failure detection signal N is obtained after the other end short circuit of R5, in addition current-limiting resistance R3 is connected to first ac input end of rectifier bridge B1 and rectifier bridge B2, current-limiting resistance R2 is connected to second ac input end of rectifier bridge B2, current-limiting resistance R1 is connected to second ac input end of rectifier bridge B1, through electrochemical capacitor C15 after two rectifier bridge output-parallels, C16 obtains level and smooth direct current and exports.
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| CN105449641A (en) * | 2015-12-04 | 2016-03-30 | 中国船舶重工集团公司第七0九研究所 | Direct current power supply with multi-path fault cut-off type protection function |
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| CN107911037A (en) * | 2017-12-11 | 2018-04-13 | 成都互聚科技有限公司 | A kind of strong switching power supply of job stability |
| CN108306254A (en) * | 2018-04-09 | 2018-07-20 | 广州金升阳科技有限公司 | A kind of isolation protective circuit and the Switching Power Supply comprising the circuit |
| CN110649791B (en) * | 2018-06-25 | 2021-05-28 | 株式会社自动网络技术研究所 | Current detection circuit and power supply device |
| CN110649791A (en) * | 2018-06-25 | 2020-01-03 | 株式会社自动网络技术研究所 | Current detection circuit and power supply device |
| CN108683153A (en) * | 2018-07-24 | 2018-10-19 | 深圳市泛海三江电子股份有限公司 | Protection circuit capable of automatically recovering |
| CN108683153B (en) * | 2018-07-24 | 2024-01-23 | 深圳市高新投三江电子股份有限公司 | Protection circuit capable of automatically recovering |
| CN110912415A (en) * | 2019-12-11 | 2020-03-24 | 国网山东省电力公司济南供电公司 | Low-power-consumption isolated output household power supply |
| CN111082676A (en) * | 2019-12-30 | 2020-04-28 | 杭州士兰微电子股份有限公司 | Switching power supply and control circuit and control method thereof |
| CN111082676B (en) * | 2019-12-30 | 2021-04-23 | 杭州士兰微电子股份有限公司 | Switching power supply and control circuit and control method thereof |
| CN114188929A (en) * | 2022-01-21 | 2022-03-15 | 西安微电子技术研究所 | Constant-voltage output overvoltage protection circuit and method of flyback DC/DC converter and switching power supply |
| CN114188929B (en) * | 2022-01-21 | 2023-05-16 | 西安微电子技术研究所 | Constant voltage output overvoltage protection circuit and method of flyback DC/DC converter and switching power supply |
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