CN102480232A - Single-ended flyback switching power supply and control device thereof - Google Patents
Single-ended flyback switching power supply and control device thereof Download PDFInfo
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Abstract
The invention provides a single-ended flyback switching power supply and a control device thereof, wherein the control device of the single-ended flyback switching power supply comprises a control signal generation module, a voltage feedback module and a current feedback module, the voltage feedback module comprises a voltage-stabilizing filtering unit, a voltage-stabilizing amplification unit, a photoelectric coupler and a voltage-stabilizing unit, and the voltage-stabilizing filtering unit, the voltage-stabilizing amplification unit, the photoelectric coupler and the voltage-stabilizing unit are sequentially connected. The single-ended flyback switching power supply comprises a transformer, a control switch, a first diode and the single-ended flyback switching power supply control device, wherein the control switch is switched between a conducting state and a turning-off state under the control of a control signal generated by the single-ended flyback switching power supply control device. According to the single-ended flyback switching power supply and the control device thereof, the voltage feedback module improves the stability of the single-ended flyback switching power supply through the arrangement of the voltage stabilizing filtering unit, the voltage stabilizing amplifying unit, the photoelectric coupler and the voltage stabilizing unit.
Description
Technical field
The present invention relates to switch power technology, relate in particular to a kind of single-ended reverse exciting switching voltage regulator and control device thereof.
Background technology
Along with the develop rapidly of modern science and technology, power device is also brought in constant renewal in, and Switching Power Supply is described as energy-efficient power supply, and it is representing the direction of stabilized voltage power supply, has become the main product of stabilized voltage power supply at present.
Fig. 1 is the single-ended reverse exciting switching voltage regulator electrical block diagram of prior art; As shown in Figure 1; This single-ended reverse exciting switching voltage regulator comprises transformer T, control switch M and control signal generating module 101; Control switch M adopts power semiconductor usually, between conducting and off state, switches under the control of the pulse width modulation that control switch M produces in control signal generating module 101 (Pulse Width Modulation is called for short PWM) signal.Control switch M is connected between transformer T primary coil and the ground contacts, can recently adjust the ON time of control switch M through the duty of control pwm signal, with the adjustment output voltage.The end of the same name of the primary coil of transformer T and secondary coil is opposite; And the secondary coil of transformer T is connected with the first diode D1, and the basic functional principle of single-ended reverse exciting switching voltage regulator circuit is: when control switch M is closed, because the voltage direction of the voltage direction of secondary coil and primary coil is opposite; The first diode D1 oppositely ends; The primary coil storage power, when control switch M turn-offs, the voltage reversal of secondary coil; The first diode D1 conducting, the power conversion of primary coil is to secondary coil.
Single-ended reverse exciting switching voltage regulator generally adopts the double loop feedback control system, and double loop feedback comprises output dc voltage feedback loop and the primary coil peak current feedback loop that magnetizes.The sampled voltage signal of isolating sampling feedback external loop feedback according to output dc voltage and the primary coil sample rate current signal that peak current sampling feedback inner looping feeds back that magnetizes; The duty ratio of indication control signal generating module 101 adjustment pwm signals; Thereby in each cycle, the output voltage in previous cycle and the primary coil peak current that magnetizes is effectively regulated, reached the purpose of regulated output voltage.
Fig. 2 is the electrical block diagram of the output dc voltage feedback circuit of prior art, and is as shown in Figure 2, and this voltage feedback circuit is simple in structure; But poor anti jamming capability, control precision are not high, and must possess frequency compensated circuit 102; But frequency compensated circuit 102 also brings vibration to Switching Power Supply simultaneously; Can influence the operate as normal of Switching Power Supply when serious, for load variations big with output voltage variation situation greatly under low-response, be not suitable for the occasion of the higher or load variations wider range of precision.The primary coil of the single-ended reverse exciting switching voltage regulator of the prior art peak current feedback loop that magnetizes adopts the Direct Sampling resistance mode usually, this mode when electric current flows through sampling resistor, certain perceptual voltage of will inducting.The impedance meeting that this inductive component appears when high frequency is very big, circuit is produced disturb, and it will consume very big power simultaneously.Increase along with frequency; The electric current that flows through sampling resistor might also not put before the next one concussion cycle arrives; The electric current that sampling resistor bears so not only consumes a lot of power of Switching Power Supply with increasing, also may cause the misoperation of control signal generating module 101 simultaneously.
Summary of the invention
The present invention provides a kind of single-ended reverse exciting switching voltage regulator and control device thereof, to improve the stability of single-ended reverse exciting switching voltage regulator.
The present invention provides a kind of single-ended reverse exciting switching voltage regulator control device; Be used to control the control switch of single-ended reverse exciting switching voltage regulator; Comprise control signal generating module, Voltage Feedback module and current feedback module; Said Voltage Feedback module is connected between the Voltage Feedback input of output and said control signal generating module of said single-ended reverse exciting switching voltage regulator; Said current feedback module is connected between the current feedback input of input and said control signal generating module of said single-ended reverse exciting switching voltage regulator; Said control signal generating module produces control signal according to the sampled voltage signal of said Voltage Feedback module generation and the sample rate current signal of said current feedback module generation, wherein
Said Voltage Feedback module comprises voltage regulation filtering unit, voltage stabilizing amplifying unit, photoelectrical coupler and voltage regulation unit; The input of said voltage regulation filtering unit links to each other with the output of said single-ended reverse exciting switching voltage regulator; Said voltage regulation filtering unit, said voltage stabilizing amplifying unit, said photoelectrical coupler are connected with said voltage regulation unit successively, and the output of said voltage regulation unit links to each other with the Voltage Feedback input of said control signal generating module.
Aforesaid single-ended reverse exciting switching voltage regulator control device, wherein,
Said current feedback module comprises current transformer and sampling resistor; The input of said current transformer links to each other with the input of said single-ended reverse exciting switching voltage regulator, and the output of said current transformer links to each other with the current feedback input of said control signal generating module through said sampling resistor.
Aforesaid single-ended reverse exciting switching voltage regulator control device, wherein,
Said photoelectrical coupler comprises first photoelectric conversion unit, second photoelectric conversion unit, voltage input end, pressure feedback port and voltage output end; Said first photoelectric conversion unit is connected between said voltage input end and the said pressure feedback port, and said second photoelectric conversion unit is connected between said voltage input end and the said voltage output end;
Said voltage regulation filtering unit comprises first operational amplifier and first electric capacity; The output of said first operational amplifier links to each other with the inverting input of said first operational amplifier; The in-phase input end of said first operational amplifier links to each other with the output of said single-ended reverse exciting switching voltage regulator, and is connected to said ground contacts through said first electric capacity;
Said voltage stabilizing amplifying unit comprises second operational amplifier and first resistance; The in-phase input end of said second operational amplifier links to each other with the output of said first operational amplifier; The inverting input of said second operational amplifier links to each other with the pressure feedback port of said photoelectrical coupler; And being connected to said ground contacts through said first resistance, the output of said second operational amplifier links to each other with the voltage input end of said photoelectrical coupler;
Said voltage regulation unit comprises the 3rd operational amplifier and second resistance; The in-phase input end of said the 3rd operational amplifier links to each other with the voltage output end of said photoelectrical coupler; And be connected to said ground contacts through said second resistance; The output of said the 3rd operational amplifier links to each other with the inverting input of said the 3rd operational amplifier, and links to each other with the Voltage Feedback input of said control signal generating module.
Aforesaid single-ended reverse exciting switching voltage regulator control device, wherein, said Voltage Feedback module also comprises partial pressure unit,
Said partial pressure unit comprises the 3rd resistance and the 4th resistance; Be connected across between the output of said single-ended reverse exciting switching voltage regulator after said the 3rd resistance and the series connection of said the 4th resistance, the tie point of said the 3rd resistance and said the 4th resistance links to each other with the in-phase input end of said first operational amplifier.
Aforesaid single-ended reverse exciting switching voltage regulator control device, wherein, said Voltage Feedback module also comprises:
The 5th resistance is connected between the tie point of in-phase input end and said the 3rd resistance and said the 4th resistance of said first operational amplifier;
The 6th resistance is connected between the in-phase input end of output and said second operational amplifier of said first operational amplifier;
The 7th resistance is connected between the in-phase input end and said ground contacts of said second operational amplifier;
The 8th resistance is connected between the voltage input end of output and said photoelectrical coupler of said second operational amplifier.
Aforesaid single-ended reverse exciting switching voltage regulator control device, wherein, said current feedback module also comprises:
Second electric capacity is connected between the output and said ground contacts of said current transformer.
The present invention provides a kind of single-ended reverse exciting switching voltage regulator; Comprise transformer, control switch and first diode; Said control switch is connected between the primary coil and ground contacts of said transformer, and said first diode is connected with the secondary coil of said transformer, when said control switch conducting; Said first diode reverse is ended; It is characterized in that, also comprise single-ended reverse exciting switching voltage regulator control device provided by the invention, said control switch switches between conducting and off state under the control of the control signal that said single-ended reverse exciting switching voltage regulator control device produces.
Aforesaid single-ended reverse exciting switching voltage regulator also comprises the input protection module, the parallel connection of primary windings of said input protection module and said transformer, and said input protection module comprises:
The 9th resistance, the 3rd electric capacity and second diode are connected with said second diode after said the 9th resistance and said the 3rd electric capacity parallel connection.
Aforesaid single-ended reverse exciting switching voltage regulator also comprises buffer module, and said buffer module is connected between the primary coil and said ground contacts of said transformer, and parallelly connected with said control switch, and said buffer module comprises:
The tenth resistance, the 4th electric capacity and the 3rd diode, said the tenth resistance with after said the 3rd diode is parallelly connected with said the 4th capacitances in series.
Aforesaid single-ended reverse exciting switching voltage regulator, wherein, the quantity of the secondary coil of said transformer is a plurality of.
Can know by technique scheme; Single-ended reverse exciting switching voltage regulator provided by the invention and control device thereof; The Voltage Feedback module is through the setting of voltage regulation filtering unit, voltage stabilizing amplifying unit, photoelectrical coupler and voltage regulation unit; Voltage feedback signal is carried out voltage stabilizing, filtering, isolation and processing and amplifying, improved the stability of single-ended reverse exciting switching voltage regulator.
Description of drawings
Fig. 1 is the single-ended reverse exciting switching voltage regulator electrical block diagram of prior art;
Fig. 2 is the electrical block diagram of the output dc voltage feedback circuit of prior art;
The single-ended reverse exciting switching voltage regulator control device structural representation that Fig. 3 provides for the embodiment of the invention one;
The single-ended reverse exciting switching voltage regulator control device electrical block diagram that Fig. 4 provides for the embodiment of the invention two;
The single-ended reverse exciting switching voltage regulator electrical block diagram that Fig. 5 provides for the embodiment of the invention three.
Reference numeral:
The 101-control signal generating module; The 102-frequency compensated circuit; 103-Voltage Feedback module;
104-current feedback module; 113-voltage regulation filtering unit; 123-voltage stabilizing amplifying unit;
The 133-photoelectrical coupler; The 143-voltage regulation unit; The T-transformer;
The M-control switch; The GND-ground contacts; D1-first diode;
D2-second diode; D3-the 3rd diode; R1-first resistance;
R2-second resistance; R3-the 3rd resistance; R4-the 4th resistance;
R5-the 5th resistance; R6-the 6th resistance; R7-the 7th resistance;
R8-the 8th resistance; R9-the 9th resistance; R10-the tenth resistance;
A1-first operational amplifier; C1-first electric capacity; C2-second electric capacity;
A2-first operational amplifier; C3-the 3rd electric capacity; C4-the 4th electric capacity;
A3-first operational amplifier.
Embodiment
For making the object of the invention, technical scheme and advantage clearer; To combine the accompanying drawing in the embodiment of the invention below; Technical scheme in the embodiment of the invention is carried out clear, intactly description; Need to prove that in accompanying drawing or specification, similar or components identical is all used identical Reference numeral.Obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Embodiment one
The single-ended reverse exciting switching voltage regulator control device structural representation that Fig. 3 provides for the embodiment of the invention one; As shown in Figure 3; This single-ended reverse exciting switching voltage regulator control device comprises control signal generating module 101, Voltage Feedback module 103 and current feedback module 104, is used to control the control switch M of single-ended reverse exciting switching voltage regulator.Voltage Feedback module 103 is connected between the Voltage Feedback input of output and control signal generating module 101 of single-ended reverse exciting switching voltage regulator; Voltage Feedback module 103 is used for the output voltage of the output of single-ended reverse exciting switching voltage regulator is handled, to produce the sampled voltage signal.Current feedback module 104 is connected between the current feedback input of input and control signal generating module 101 of single-ended reverse exciting switching voltage regulator; Current feedback module 104 is used for the electric current of single-ended reverse exciting switching voltage regulator input is handled, to produce the sample rate current signal.Control signal generating module 101 produces control signal according to the sampled voltage signal of Voltage Feedback module 103 generations and the sample rate current signal of current feedback module 104 generations.Voltage Feedback module 103 comprises voltage regulation filtering unit 113, voltage stabilizing amplifying unit 123, photoelectrical coupler 133 and voltage regulation unit 143; The input of voltage regulation filtering unit 113 links to each other with the output of single-ended reverse exciting switching voltage regulator; Voltage regulation filtering unit 113, voltage stabilizing amplifying unit 123, photoelectrical coupler 133 and voltage regulation unit 143 are connected successively, and the output of voltage regulation unit 143 links to each other with the Voltage Feedback input of control signal generating module 101.The single-ended reverse exciting switching voltage regulator control device that present embodiment provides; The output voltage of the output of single-ended reverse exciting switching voltage regulator is handled the sampled voltage signal stabilization height that the back produces through voltage regulation filtering unit 113, voltage stabilizing amplifying unit 123, photoelectrical coupler 133 and voltage regulation unit 143; Feedback speed is fast, need not to increase the frequency compensation link, makes Voltage Feedback have real-time; And dead-beat influences, and has improved the stability of single-ended reverse exciting switching voltage regulator.
In the present embodiment; Current feedback module 104 can comprise current transformer and sampling resistor; The input of current transformer links to each other with the input of single-ended reverse exciting switching voltage regulator, and the output of current transformer links to each other with the current feedback input of control signal generating module 101 through sampling resistor R.Current transformer generally includes mutual inductor, resistance of cross-over connection between the secondary coil of mutual inductor, and the umber of turn of secondary coil is greater than the umber of turn of primary coil.Therefore the setting through current transformer; Can the bigger input current of the input of single-ended reverse exciting switching voltage regulator be converted to less current output; Not only realize the electrical isolation of input and output, reduced the loss of single-ended reverse exciting switching voltage regulator, and owing to reduce through the electric current on the sampling resistor; The impedance of sampling resistor can not increase sharply along with the increase of frequency; Even under high frequency situations, the power that sampling resistor consumed is also very little, further improved the antijamming capability and the operating efficiency of single-ended reverse exciting switching voltage regulator.
Embodiment two
The single-ended reverse exciting switching voltage regulator control device electrical block diagram that Fig. 4 provides for the embodiment of the invention two; The photoelectrical coupler 133 of this single-ended reverse exciting switching voltage regulator control device specifically can comprise first photoelectric conversion unit, second photoelectric conversion unit, voltage input end, pressure feedback port and voltage output end; First photoelectric conversion unit is connected between voltage input end and the pressure feedback port, and second photoelectric conversion unit is connected between voltage input end and the voltage output end.Preferably, photoelectrical coupler 133 can adopt CNR201, and CNR201 is the high-speed linear optocoupler, has improved feedback response speed, and then has improved the accuracy of Voltage Feedback.Realize output and the isolation of importing through being provided with of photoelectrical coupler 133, improved the stability of Voltage Feedback.Voltage regulation filtering unit 113 can comprise first operational amplifier A 1 and first capacitor C 1; The output of first operational amplifier A 1 links to each other with the inverting input of first operational amplifier A 1; The in-phase input end of first operational amplifier A 1 links to each other with the output of single-ended reverse exciting switching voltage regulator, and is connected to ground contacts GND through first capacitor C 1.Voltage stabilizing amplifying unit 123 can comprise second operational amplifier A 2 and first resistance R 1; The in-phase input end of second operational amplifier A 2 links to each other with the output of first operational amplifier A 1; The inverting input of second operational amplifier A 2 links to each other with the pressure feedback port of photoelectrical coupler 133; And being connected to ground contacts GND through first resistance R 1, the output of second operational amplifier A 2 links to each other with the voltage input end of photoelectrical coupler 133.Voltage regulation unit 143 can comprise the 3rd operational amplifier A 3 and second resistance R 2; The in-phase input end of the 3rd operational amplifier A 3 links to each other with the voltage output end of photoelectrical coupler 133; And be connected to ground contacts GND through second resistance R 2; The output of the 3rd operational amplifier A 3 links to each other with the inverting input of the 3rd operational amplifier A 3, and links to each other with the Voltage Feedback input of control signal generating module 101.Preferably; First operational amplifier A 1, second operational amplifier A 2 and the 3rd operational amplifier A 3 all can adopt LM158; LM158 is a low-power consumption high-gain dual operational amplifier, can reduce the power loss of Voltage Feedback module 103, improves the stability of Voltage Feedback.Those skilled in the art also can adopt other elements, and perhaps other circuit forms are realized voltage regulation filtering unit 113, voltage stabilizing amplifying unit 123, photoelectrical coupler 133 and voltage regulation unit 143, do not exceed with present embodiment.
In the present embodiment; Voltage Feedback module 103 can also comprise partial pressure unit; Partial pressure unit comprises the 3rd resistance R 3 and the 4th resistance R 4; Be connected across between the output of single-ended reverse exciting switching voltage regulator after the 3rd resistance R 3 and 4 series connection of the 4th resistance R, the tie point of the 3rd resistance R 3 and the 4th resistance R 4 links to each other with the in-phase input end of first operational amplifier A 1.Through the setting of partial pressure unit, when excessive, can carry out dividing potential drop to the output voltage range of single-ended reverse exciting switching voltage regulator to it, the input voltage that is about to Voltage Feedback module 103 is adjusted within the working range, has improved the fail safe of Voltage Feedback module 103.Can come division module is provided with according to physical circuit input voltage demand, not exceed with present embodiment.
For obtaining suitable voltage; Can connect suitable resistance element between each device of technique scheme; Voltage Feedback module 103 comprises that also the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7 and the 8th resistance R 8, the five resistance R 5 are connected between the tie point of in-phase input end and the 3rd resistance R 3 and the 4th resistance R 4 of first operational amplifier A 1.The 6th resistance R 6 is connected between the in-phase input end of output and second operational amplifier A 2 of first operational amplifier A 1.The 7th resistance R 7 is connected between the in-phase input end and ground contacts GND of second operational amplifier A 2.The 8th resistance R 8 is connected between the voltage input end of output and photoelectrical coupler 133 of second operational amplifier A 2.Current feedback module 104 can also comprise that second capacitor C, 2, the second capacitor C 2 are connected between the output and ground contacts GND of current transformer.Through the setting of second capacitor C 2, feedback current is carried out filtering, improved the stability of current feedback.
Embodiment three
The single-ended reverse exciting switching voltage regulator electrical block diagram that Fig. 5 provides for the embodiment of the invention three; As shown in Figure 5, this single-ended reverse exciting switching voltage regulator comprises transformer T, control switch M and the first diode D1; Control switch M is connected between the primary coil and ground contacts GND of transformer T; The first diode D1 connects with the secondary coil of transformer T, and when control switch M conducting, the first diode D1 oppositely ends; Single-ended reverse exciting switching voltage regulator also comprises the single-ended reverse exciting switching voltage regulator control device that any embodiment of the present invention provides, and control switch M switches between conducting and off state under the control of the control signal that the single-ended reverse exciting switching voltage regulator control device produces.
Control signal generating module 101 in the single-ended reverse exciting switching voltage regulator control device specifically can adopt UC3844, and control switch M specifically can be isolated gate FET, in practical application; The pulse width modulator chip that control signal generating module 101 also can adopt other does not exceed with present embodiment, and the concrete course of work of this single-ended reverse exciting switching voltage regulator is: control signal generation circuit produces control signal; Specifically can be pwm signal, M controls to control switch, when control switch M is in conducting state; Because the voltage direction of secondary coil is opposite with the voltage direction of primary coil, the first diode D1 oppositely ends, the primary coil storage power; When control switch M turn-offs; The voltage reversal of secondary coil, diode current flow, the power conversion of primary coil is to secondary coil; Further can carry out filtering to output voltage at the across electric capacity of secondary coil.The voltage of transformer T output is through after voltage stabilizing, filtering, amplification and the isolation processing of voltage feedback circuit; Convert the sampled voltage signal to and offer control signal generating module 101; The input current of 104 couples of transformer T of current feedback module primary coil is isolated, after conversion and the Filtering Processing; Generate the sample rate current signal and offer control signal generating module 101, control signal generating module 101 is according to the duty ratio of sampled voltage signal and sample rate current signal adjustment control signal, and then the conducting of adjustment control switch M and the time of shutoff; With the adjustment output voltage, improved the stability of output voltage.
In the present embodiment; Single-ended reverse exciting switching voltage regulator can also comprise the input protection module; The parallel connection of primary windings of input protection module and transformer T; The input protection module comprises the 9th resistance R 9, the 3rd capacitor C 3 and the second diode D2, connects with the second diode D2 in the 9th resistance R 9 and the 3rd capacitor C 3 parallel connection backs.Transformer T in the single-ended reverse exciting switching voltage regulator is generally high frequency transformer, the setting of input protection module, and the peak voltage that the high frequency transformer leakage inductance is caused limits, and has improved the fail safe and the stability of single-ended reverse exciting switching voltage regulator.
In the present embodiment; Single-ended reverse exciting switching voltage regulator can also comprise buffer module; Buffer module is connected between the primary coil and ground contacts GND of transformer T; And parallelly connected with control switch M, buffer module comprises the tenth resistance R 10, the 4th capacitor C 4 and the 3rd diode D3, connects with the 4th capacitor C 4 after the tenth resistance R 10 and the 3rd diode D3 parallel connection.Being provided with of buffer module can prevent that control switch M from bearing big back-pressure in turn off process, avoided the impact failure of control switch M.
In the present embodiment; The quantity of the secondary coil of transformer T is a plurality of; Be that output voltage is a plurality of; The scope of output voltage also can be provided with through the winding of secondary coil, makes single-ended reverse exciting switching voltage regulator can export the direct voltage of different amplitudes, has improved the adaptability of single-ended reverse exciting switching voltage regulator.
Single-ended reverse exciting switching voltage regulator provided by the invention and control device thereof; The Voltage Feedback module is through the setting of voltage regulation filtering unit, voltage stabilizing amplifying unit, photoelectrical coupler and voltage regulation unit; Improved feedback response speed; Make Voltage Feedback have real-time, improved the stability of single-ended reverse exciting switching voltage regulator.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that previous embodiment is put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (10)
1. single-ended reverse exciting switching voltage regulator control device; Be used to control the control switch of single-ended reverse exciting switching voltage regulator; Said device comprises control signal generating module, Voltage Feedback module and current feedback module; Said Voltage Feedback module is connected between the Voltage Feedback input of output and said control signal generating module of said single-ended reverse exciting switching voltage regulator; Said current feedback module is connected between the current feedback input of input and said control signal generating module of said single-ended reverse exciting switching voltage regulator; Said control signal generating module produces control signal according to the sampled voltage signal of said Voltage Feedback module generation and the sample rate current signal of said current feedback module generation, it is characterized in that:
Said Voltage Feedback module comprises voltage regulation filtering unit, voltage stabilizing amplifying unit, photoelectrical coupler and voltage regulation unit; The input of said voltage regulation filtering unit links to each other with the output of said single-ended reverse exciting switching voltage regulator; Said voltage regulation filtering unit, said voltage stabilizing amplifying unit, said photoelectrical coupler are connected with said voltage regulation unit successively, and the output of said voltage regulation unit links to each other with the Voltage Feedback input of said control signal generating module.
2. single-ended reverse exciting switching voltage regulator control device according to claim 1 is characterized in that:
Said current feedback module comprises current transformer and sampling resistor; The input of said current transformer links to each other with the input of said single-ended reverse exciting switching voltage regulator, and the output of said current transformer links to each other with the current feedback input of said control signal generating module through said sampling resistor.
3. single-ended reverse exciting switching voltage regulator control device according to claim 1 is characterized in that:
Said photoelectrical coupler comprises first photoelectric conversion unit, second photoelectric conversion unit, voltage input end, pressure feedback port and voltage output end; Said first photoelectric conversion unit is connected between said voltage input end and the said pressure feedback port, and said second photoelectric conversion unit is connected between said voltage input end and the said voltage output end;
Said voltage regulation filtering unit comprises first operational amplifier and first electric capacity; The output of said first operational amplifier links to each other with the inverting input of said first operational amplifier; The in-phase input end of said first operational amplifier links to each other with the output of said single-ended reverse exciting switching voltage regulator, and is connected to said ground contacts through said first electric capacity;
Said voltage stabilizing amplifying unit comprises second operational amplifier and first resistance; The in-phase input end of said second operational amplifier links to each other with the output of said first operational amplifier; The inverting input of said second operational amplifier links to each other with the pressure feedback port of said photoelectrical coupler; And being connected to said ground contacts through said first resistance, the output of said second operational amplifier links to each other with the voltage input end of said photoelectrical coupler;
Said voltage regulation unit comprises the 3rd operational amplifier and second resistance; The in-phase input end of said the 3rd operational amplifier links to each other with the voltage output end of said photoelectrical coupler; And be connected to said ground contacts through said second resistance; The output of said the 3rd operational amplifier links to each other with the inverting input of said the 3rd operational amplifier, and links to each other with the Voltage Feedback input of said control signal generating module.
4. single-ended reverse exciting switching voltage regulator control device according to claim 3 is characterized in that, said Voltage Feedback module also comprises partial pressure unit,
Said partial pressure unit comprises the 3rd resistance and the 4th resistance; Be connected across between the output of said single-ended reverse exciting switching voltage regulator after said the 3rd resistance and the series connection of said the 4th resistance, the tie point of said the 3rd resistance and said the 4th resistance links to each other with the in-phase input end of said first operational amplifier.
5. single-ended reverse exciting switching voltage regulator control device according to claim 4 is characterized in that, said Voltage Feedback module also comprises:
The 5th resistance is connected between the tie point of in-phase input end and said the 3rd resistance and said the 4th resistance of said first operational amplifier;
The 6th resistance is connected between the in-phase input end of output and said second operational amplifier of said first operational amplifier;
The 7th resistance is connected between the in-phase input end and said ground contacts of said second operational amplifier;
The 8th resistance is connected between the voltage input end of output and said photoelectrical coupler of said second operational amplifier.
6. single-ended reverse exciting switching voltage regulator control device according to claim 2 is characterized in that, said current feedback module also comprises:
Second electric capacity is connected between the output and said ground contacts of said current transformer.
7. single-ended reverse exciting switching voltage regulator; Comprise transformer, control switch and first diode; Said control switch is connected between the primary coil and ground contacts of said transformer, and said first diode is connected with the secondary coil of said transformer, when said control switch conducting; Said first diode reverse is ended; It is characterized in that, also comprise the arbitrary described single-ended reverse exciting switching voltage regulator control device of claim 1-6, said control switch switches between conducting and off state under the control of the control signal that said single-ended reverse exciting switching voltage regulator control device produces.
8. single-ended reverse exciting switching voltage regulator according to claim 7 is characterized in that, also comprises the input protection module, the parallel connection of primary windings of said input protection module and said transformer, and said input protection module comprises:
The 9th resistance, the 3rd electric capacity and second diode are connected with said second diode after said the 9th resistance and said the 3rd electric capacity parallel connection.
9. single-ended reverse exciting switching voltage regulator according to claim 8 is characterized in that, also comprises buffer module, and said buffer module is connected between the primary coil and said ground contacts of said transformer, and parallelly connected with said control switch, and said buffer module comprises:
The tenth resistance, the 4th electric capacity and the 3rd diode, said the tenth resistance with after said the 3rd diode is parallelly connected with said the 4th capacitances in series.
10. single-ended reverse exciting switching voltage regulator according to claim 7 is characterized in that: the quantity of the secondary coil of said transformer is a plurality of.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105745101A CN102480232A (en) | 2010-11-30 | 2010-11-30 | Single-ended flyback switching power supply and control device thereof |
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| CN2010105745101A CN102480232A (en) | 2010-11-30 | 2010-11-30 | Single-ended flyback switching power supply and control device thereof |
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| CN2010105745101A Pending CN102480232A (en) | 2010-11-30 | 2010-11-30 | Single-ended flyback switching power supply and control device thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105634282A (en) * | 2014-10-29 | 2016-06-01 | 江苏绿扬电子仪器集团有限公司 | Offline inverter auxiliary power supply device |
| CN106257464A (en) * | 2015-06-16 | 2016-12-28 | 新思科技有限公司 | For the method connecting on and off switch in IC layout |
| CN106301026A (en) * | 2016-08-31 | 2017-01-04 | 淮阴师范学院 | A kind of switching power unit |
| CN111200363A (en) * | 2018-11-19 | 2020-05-26 | 深南电路股份有限公司 | Switching power supply and electronic device |
| CN112398321A (en) * | 2020-11-04 | 2021-02-23 | 株洲格新电气科技有限公司 | Low ripple multi-way switch power supply |
| WO2021036607A1 (en) * | 2019-08-23 | 2021-03-04 | 华为技术有限公司 | Flyback converter and electronic device |
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| CN105634282A (en) * | 2014-10-29 | 2016-06-01 | 江苏绿扬电子仪器集团有限公司 | Offline inverter auxiliary power supply device |
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| CN106257464B (en) * | 2015-06-16 | 2022-03-04 | 新思科技有限公司 | Method for connecting power switches in an IC layout |
| CN106301026A (en) * | 2016-08-31 | 2017-01-04 | 淮阴师范学院 | A kind of switching power unit |
| CN111200363A (en) * | 2018-11-19 | 2020-05-26 | 深南电路股份有限公司 | Switching power supply and electronic device |
| WO2021036607A1 (en) * | 2019-08-23 | 2021-03-04 | 华为技术有限公司 | Flyback converter and electronic device |
| CN112398321A (en) * | 2020-11-04 | 2021-02-23 | 株洲格新电气科技有限公司 | Low ripple multi-way switch power supply |
| CN112398321B (en) * | 2020-11-04 | 2021-08-24 | 株洲格新电气科技有限公司 | Low ripple multi-way switch power supply |
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Application publication date: 20120530 |