CN103078478A - Controller for switching power supply and switching power supply - Google Patents
Controller for switching power supply and switching power supply Download PDFInfo
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- CN103078478A CN103078478A CN2013100246327A CN201310024632A CN103078478A CN 103078478 A CN103078478 A CN 103078478A CN 2013100246327 A CN2013100246327 A CN 2013100246327A CN 201310024632 A CN201310024632 A CN 201310024632A CN 103078478 A CN103078478 A CN 103078478A
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Abstract
The invention discloses a controller for a switching power supply. The controller comprises a feedback (FB) detection circuit, wherein the output end of the FB detection circuit is connected with an oscillator circuit and an over-current protection circuit; the output ends of the oscillator circuit and the over-current protection circuit are connected with a pulse width modulation (PWM) logic control circuit respectively; and the output end of the PWM logic control circuit is connected with a driving circuit. The controller for the switching power supply is applied to a switching power supply circuit, the FB detection circuit can output different signals according to different load conditions, the oscillator circuit can control the working frequency of the switching power supply according to the output signals of the FB detection circuit, and the over-current protection circuit controls duty ratios of output signals of the oscillator circuit according to the output signals of the FB detection circuit, so that the working frequency can be adapted to different loads, and the energy consumption of the switching power supply is reduced.
Description
Technical field
The present invention relates to power technique fields, particularly a kind of switch power controller and use the Switching Power Supply of this switch power controller.
Background technology
Switching Power Supply is the time ratio that a kind of control switch pipe connected sum turn-offs, and keeps the power supply of regulated output voltage, and Switching Power Supply is widely used in the electronic product with characteristics such as small-sized, light weight, high efficiency.According to statistics, the electric power proportion of the stand-by power consumption of electronic product in the whole world is 3%-13%.Along with the development of power electronic technology and the enhancing of energy-conserving and environment-protective consciousness, the stand-by power consumption of electronic product becomes an important performance characteristic that receives much concern, and low standby power loss becomes the trend of electronic product inevitable development.
Inevitably there is energy loss in the course of the work in Switching Power Supply, for example switching loss, conduction loss and control circuit loss.Energy loss and the operating frequency of Switching Power Supply are proportional, and the trend of miniaturization of electronic products causes the operating frequency of Switching Power Supply to rise, and the energy of loss also constantly increases, and becomes the major part of Switching Power Supply energy loss under underloading or holding state.How to effectively reduce the operating frequency of Switching Power Supply, the operating frequency of Switching Power Supply becomes present problem demanding prompt solution when especially how reducing underloading or zero load.
Summary of the invention
The object of the present invention is to provide a kind of switch power controller and use the Switching Power Supply of this switch power controller, the operating frequency of Switching Power Supply can reduce along with reducing of load, thereby realizes the Switching Power Supply low standby power loss.
In order to realize the foregoing invention purpose, the invention provides following technical scheme:
A kind of switch power controller, comprise the FB testing circuit, the output of described FB testing circuit is connected with pierce circuit and current foldback circuit, the output of described pierce circuit is connected output and is connected respectively the PWM logic control circuit with current foldback circuit, the output of described PWM logic control circuit is connected with drive circuit;
Described switch power controller is applied in the switching power circuit, the MOS power tube in the described drive circuit connecting valve power circuit, and described pierce circuit is according to the operating frequency of the output signal control switch power-supply controller of electric of FB testing circuit; Described current foldback circuit is according to the duty ratio of the output signal control generator circuit output signal of FB testing circuit.
According to the embodiment of the invention, the feedback voltage of the input of FB testing circuit access switch power source output voltage, and obtain the first feedback voltage and the second feedback voltage, export to respectively current foldback circuit and pierce circuit; The benchmark job frequency of the input access Switching Power Supply of pierce circuit, pierce circuit is according to the clock signal of the second feedback voltage output corresponding frequencies, the operating frequency of control switch power-supply controller of electric.
Further, when the second feedback voltage during in the reference voltage range of setting, the operating frequency of switch power controller is the benchmark job frequency; When the second feedback voltage reduced and reach the step-down threshold value of switch power controller setting, the operating frequency of switch power controller reduced gradually along with the second reducing of feedback voltage; When the second feedback voltage during less than or equal to the voltage stabilizing threshold value set, the operating frequency of switch power controller is to keep the minimum frequency of operation of Switching Power Supply work.
According to the embodiment of the invention; sampled voltage when the input of current foldback circuit accesses the conducting of MOS power tube; current foldback circuit compensates sampled voltage; make sampled voltage increase set point; when the sampled voltage after the compensation reached the first feedback voltage, current foldback circuit output signal control PWM logical circuit turn-offed the MOS power tube.
Preferably, the input of current foldback circuit also is connected with the overcurrent protection compensating circuit, the input access input current of described overcurrent protection compensating circuit, input current forms overcurrent protection bucking voltage, overcurrent protection bucking voltage input overcurrent protection circuit through the overcurrent protection compensating circuit; When the sampled voltage after the compensation reached the overcurrent protection bucking voltage, current foldback circuit output signal control PWM logical circuit turn-offed the MOS power tube.In MOS power tube conduction period, sampled voltage increases gradually.If but load is very heavy, the first feedback voltage is then very large, if the sampled voltage after the compensation always less than the first feedback voltage, then uncontrollable MOS power tube turn-offs.Therefore the overcurrent protection compensating circuit is set, turn-offs by overcurrent protection bucking voltage control MOS power tube, effectively ensured the shutoff of MOS power tube.
Preferably, switch power controller also comprises temperature protection circuit, and the output of temperature protection circuit connects the input of PWM logic control circuit, and the input of temperature protection circuit connects photo resistance; When the input voltage of temperature protection circuit was lower than the setting voltage threshold value, temperature protection circuit was used for turn-offing the signal of MOS power tube to the output of PWM logic control circuit.
Preferably, switch power controller also comprises start-up circuit, described start-up circuit comprises charging circuit, the power input VIN of the input connecting valve power-supply controller of electric of described charging circuit, the feeder ear VDD of the output connecting valve power-supply controller of electric of charging circuit, described power input VIN access input voltage charges, and starting switch power-supply controller of electric when charging voltage reaches the starting resistor of switch power controller stops charging simultaneously.
The present invention also provides a kind of AC-DC Switching Power Supply of using above-mentioned switch power controller, comprise switch power controller and transformer, the output of drive circuit connects the grid of MOS power tube in the switch power controller, the armature winding of the drain electrode connection transformer of MOS power tube, the armature winding of transformer also is connected with rectification circuit, the two ends of primary winding are connected with the RCD absorption circuit, the source electrode of MOS power tube is by sampling resistor ground connection, the input of current foldback circuit connects the source electrode of MOS power tube in the switch power controller, the power supply port VDD of switch power controller is by the auxiliary winding of diode connection transformer, the secondary winding of transformer is connected with the output voltage feedback circuit, the input of FB testing circuit in the optical coupler connecting valve power-supply controller of electric in the described output voltage feedback circuit; The input of pierce circuit connection reference frequency arranges resistance in the switch power controller, and described reference frequency arranges the other end ground connection of resistance.
According to the embodiment of the invention; in MOS power tube conduction period; access the armature winding of transformer after the rectification of AC-input voltage process rectification circuit with DC input voitage; form the inductive current that increases gradually at the primary winding; this inductive current flows through sampling resistor, forms sampled voltage and accesses current foldback circuit in the switch power controller.At MOS power tube blocking interval, the armature winding of transformer is released to the magnetic energy of storage by the RCD absorption circuit: the secondary winding of transformer is connected with the first rectifier diode, and the secondary winding of transformer provides output voltage by the first rectifier diode; The auxiliary winding of transformer is connected with the second rectifier diode, and the auxiliary winding of transformer is the power supply port VDD power supply of switch power controller by the second rectifier diode.
Further, described output voltage feedback circuit also comprises the first resistance and second resistance of series connection, the 3rd resistance, diode and the TL431 of series connection, and the first resistance is connected with the secondary winding of transformer respectively with the 3rd resistance; The output voltage feedback circuit is sampled to output voltage by the first resistance and second resistance of series connection; and the 3rd resistance, diode and TL431 generation feedback current by connecting; feedback current is transferred to FB testing circuit in the switch power controller by optical coupler again; feedback current generates the first feedback voltage and the second feedback voltage through the FB testing circuit, exports to respectively current foldback circuit and pierce circuit.
According to the embodiment of the invention, current foldback circuit receives sampled voltage and sampled voltage is compensated, make sampled voltage increase set point, when the sampled voltage after the compensation reached the first feedback voltage, the output of current foldback circuit generating output signal control PWM logic control circuit was used for turn-offing the signal of MOS power tube; MOS power tube ON time
, wherein,
Expression MOS power tube ON time size,
The armature winding inductance value size of indication transformer 104,
Expression MOS power tube conduction period is flow through the maximum current of the armature winding of transformer,
DC input voitage value after the rectification of expression AC-input voltage process rectification circuit.
According to the embodiment of the invention, pierce circuit is regulated the frequency of the clock signal of its generation automatically according to the second feedback voltage of input: when the second feedback voltage during in the reference voltage range of setting, the frequency of the clock signal of pierce circuit output is for arranging the benchmark job frequency that resistance arranges by reference frequency in advance; When the second feedback voltage reduced gradually and reach the step-down threshold value, the frequency of clock signal reduced continuously along with the second reducing of feedback voltage; When the second feedback voltage during less than or equal to the voltage stabilizing threshold value, the frequency of clock signal is to keep the minimum frequency of operation of Switching Power Supply work.The transformable clock signal that pierce circuit will generate is exported to the PWM logic control circuit, and the PWM logic control circuit is according to the work period of the FREQUENCY CONTROL MOS power tube of the clock signal of pierce circuit output.
The power input mouth VIN of switch power controller connects the output of rectification circuit by current-limiting resistance.The input of temperature protection circuit connects photo resistance NTC in the switch power controller.When the resistance of external photo resistance reduces along with the rising of ambient temperature; the input voltage of temperature protection circuit also descends thereupon; when dropping to the voltage threshold that temperature protection circuit establishes; the PWM logic control circuit sends for the signal that turn-offs the MOS power tube to drive circuit, turn-offs the MOS power tube.
Compared with prior art, beneficial effect of the present invention:
The feedback voltage of switch power source output voltage has reacted the loading condition in the switching power circuit, switch power controller of the present invention can be according to the feedback voltage that gathers switch power source output voltage, dynamically adjust the operating frequency of Switching Power Supply and the ON time of an interior MOS power tube of work period, so that the operating frequency of Switching Power Supply reduces along with reducing of load, and then reduced the energy loss of Switching Power Supply.
Switching Power Supply provided by the invention has been used switch power controller of the present invention, be provided with in the switching power circuit for the feedback circuit that gathers output voltage, generate feedback voltage, switch power controller can be according to opening that feedback voltage is dynamically adjusted the operating frequency of Switching Power Supply and the ON time of MOS power tube in work period, so that the operating frequency of Switching Power Supply reduces along with reducing of load, and then reduced the energy loss of Switching Power Supply.
Description of drawings:
Fig. 1 is the theory structure block diagram of switch power controller of the present invention.
Fig. 2 is a kind of switching power circuit figure that uses switch power controller shown in Figure 1.
Mark among the figure: 101-Switching Power Supply control chip, 102-rectification circuit, 103-RCD absorption circuit; the 104-transformer circuit, 105-optical coupler, 106-MOS power tube; the 107-thermistor; the 201-start-up circuit, 202-current foldback circuit, 203-FB testing circuit; the 204-pierce circuit; the 205-PWM logic control circuit, 206-drive circuit, 207-temperature protection circuit.
Embodiment
The present invention is described in further detail below in conjunction with test example and embodiment.But this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following embodiment, all technology that realizes based on content of the present invention all belong to scope of the present invention.
With reference to figure 1; switch power controller of the present invention comprises FB testing circuit 203; pierce circuit (OSC) 204; current foldback circuit (OCP) 202 and PWM logic control circuit 205; the input of the output difference connection oscillator circuit 204 of described FB testing circuit 203 and the input of current foldback circuit 202; the output that the output of pierce circuit 204 is connected with current foldback circuit connects respectively the input of PWM logic control circuit 205; the output of PWM logic control circuit 205 is connected with drive circuit 206, and described drive circuit 206 is used for the shutoff of the MOS power tube of control switch power circuit.Described pierce circuit 204 is according to the operating frequency of the output signal control switch power supply of FB testing circuit 203; Described current foldback circuit 202 is namely controlled the ON time of MOS power tube in the work period according to the duty ratio of the output signal control generator circuit output signal of FB testing circuit 203.
Switch power controller is applied in the switching power circuit; the feedback current of the input access sampling switch electric power output voltage of FB testing circuit 203; FB testing circuit 203 detects the feedback current of input; and obtain the first feedback voltage and the second feedback voltage, export to respectively current foldback circuit 202 and pierce circuit 204.The benchmark job frequency of the input access Switching Power Supply of pierce circuit 204, pierce circuit 204 is according to the clock signal of the second feedback voltage output corresponding frequencies, and transfer to PWM logic control circuit 205, transfer to drive circuit 206 through PWM logic control circuit 205 again, drive circuit 206 turn-offs according to the output signal control MOS power tube of PWM logic control circuit 205.When the second feedback voltage during in normal range (NR), switch power controller is operated under the benchmark job frequency; When load reduces, when namely the second feedback voltage reduced and reach step-down threshold value that switch power controller sets, the operating frequency of Switching Power Supply reduced gradually along with the second reducing of feedback voltage; When the second feedback voltage continued to be reduced to the voltage stabilizing threshold value of setting, it is constant that the operating frequency of Switching Power Supply reaches minimum frequency of operation and keeps this minimum frequency of operation, to guarantee the Switching Power Supply normal operation.
MOS power tube conduction period is to the voltage that flows through the MOS power tube generation sampled voltage of sampling.The input of current foldback circuit 202 accesses sampled voltage, and sampled voltage is compensated, and makes sampled voltage increase set point.In MOS power tube conduction period, sampled voltage increases gradually, and the sampled voltage after the compensation is also corresponding to be increased gradually.When the sampled voltage after the compensation reached the first feedback voltage, current foldback circuit 202 output signals control PWM logical circuit 205 turn-offed the MOS power tube.Be that current foldback circuit 202 is according to the ON time of the first feedback voltage control switch power-supply controller of electric MOS power tube within a work period.
Switch power controller of the present invention is according to the feedback voltage of switch power source output voltage, the ON time of metal-oxide-semiconductor in the dynamic operating frequency of adjusting switch power controller and work period, so that the operating frequency of Switching Power Supply reduces along with reducing of load, and then reduce the energy loss of Switching Power Supply.
A kind of preferred implementation as switch power controller of the present invention; switch power controller also comprises temperature protection circuit (OTP protection) 207; the output of temperature protection circuit 207 connects the input of PWM logic control circuit 205; in switching power circuit, the external photo resistance of the input of temperature protection circuit 207.Temperature protection circuit 207 is unlikely to can't work because of excess Temperature for the protection of the components and parts in the switching power circuit.
Another kind of preferred implementation as switch power controller of the present invention, switch power controller also comprises start-up circuit 201, start-up circuit 201 comprises charging circuit, the power input mouth VIN of the input connecting valve power-supply controller of electric of charging circuit, the access input voltage charges, the power supply port VDD of the output connecting valve power-supply controller of electric of charging circuit, switch power controller is started working when charging voltage reaches the starting resistor of switch power controller, stops simultaneously charging.
With reference to figure 2, above-mentioned switch power controller is packaged into the Switching Power Supply control chip, be applied in the switching power circuit.The Switching Power Supply control chip comprises eight pins, being respectively startup pin VIN(startup pin VIN namely is the power input mouth of switch power controller), supply power voltage pin VDD(supply power voltage pin VDD namely is the power supply port of switch power controller), grounding pin GND, feedback pin FB, sampling pin CS, temperature monitoring pin RT, benchmark job set of frequency pin RI, and output control pin GATE.Wherein, starting pin VIN is the input of charging circuit; supply power voltage pin VDD is the output of charging circuit; feedback pin FB is the input of FB testing circuit 203; sampling pin CS is the input of current foldback circuit 202; temperature monitoring pin RT is the input of temperature protection circuit 207, and benchmark job set of frequency pin RI is the input of pierce circuit 204, and output control pin GATE is the output of drive circuit 206.As shown in Figure 1.
Above-mentioned switch power controller is applied in the switching power circuit, for example will be packaged into the Switching Power Supply control chip and be applied in the AC-DC Switching Power Supply that present embodiment enumerates, as shown in Figure 2.The output of Switching Power Supply control chip 101 control pin GATE connects that the MOS power tube is N-type MOS power tube in the MOS power tube 106(present embodiment) grid, the source electrode of MOS power tube is by sampling resistor R5 ground connection, the sampling pin CS of Switching Power Supply control chip 101 connects the source electrode of MOS power tube, be used for receiving the sampled voltage at sampling resistor R5 two ends, the armature winding of the drain electrode connection transformer 104 of MOS power tube, the two ends of transformer 104 armature windings connect RCD absorption circuit 103.The supply power voltage pin VDD of Switching Power Supply control chip 101 is by the auxiliary winding of diode D3 connection transformer 104, the secondary winding of transformer 104 (being the output of transformer 104) connects output voltage feedback circuit, the feedback pin FB of the optical coupler 105 connecting valve power supply control chips 101 in the output voltage feedback circuit.The startup pin VIN of Switching Power Supply control chip 101 connects rectification circuit 102 by current-limiting resistance R1, and the benchmark job set of frequency pin RI of Switching Power Supply control chip connects reference frequency resistance R 6 is set, and reference frequency arranges the other end ground connection of resistance R 6.The grounding pin GND ground connection of Switching Power Supply control chip.The temperature monitoring pin RT of Switching Power Supply control chip connects photo resistance 107.
The startup pin VIN of Switching Power Supply control chip 101 is connected with supply power voltage pin VDD by charging circuit.AC-input voltage AC is by rectification circuit 102 rectifications, form DC input voitage, DC input voitage starts pin VIN by current-limiting resistance R1 access, starting pin VIN charges to supply power voltage pin VDD by charging circuit, when voltage reaches the starting resistor of Switching Power Supply control chip 101 inner settings, Switching Power Supply control chip 101 is started working, and starts simultaneously pin VIN and stops supply power voltage pin VDD is charged.
In the Switching Power Supply control chip 101 whole courses of work, the signal that feedback pin FB feeds back by optical coupler 105 is judged the loading condition of Switching Power Supply, and the operating frequency of Switching Power Supply is regulated.The output voltage feedback circuit is sampled to output voltage by divider resistance R3 and R4; and the series connection of passing through TL431, resistance R 2 and diode generates feedback current; feedback current is transferred to the feedback pin FB of Switching Power Supply control chip 101 again by optical coupler 105; it is feedback current is transferred to the FB testing circuit again by optical coupler 105 input; feedback current generates the first feedback voltage and the second feedback voltage by the FB testing circuit again, exports to respectively current foldback circuit 202 and pierce circuit 204.
After current foldback circuit 202 receives sampled voltage, by internal circuit sampled voltage is compensated, make sampled voltage increase set point, the sampled voltage after will compensating is again compared with the first feedback voltage.When the sampled voltage after the compensation rose to the first feedback voltage, current foldback circuit 202 output signals control PWM logical circuit 205 turn-offed the MOS power tube.Current foldback circuit 202 is namely controlled the ON time of MOS power tube in the work period, MOS power tube ON time according to the duty ratio of the output signal of sampled voltage control pin GATE end
, wherein:
Expression MOS power tube ON time size;
The armature winding inductance value size of indication transformer 104;
Expression MOS power tube conduction period is flow through the maximum current of the armature winding of transformer 104;
AC is through the DC input voitage value behind the rectification circuit 102 for the expression AC-input voltage.
In MOS power tube conduction period, sampled voltage is linear and increases.If but the load that Switching Power Supply connects is larger, then the first feedback voltage is larger, if the sampled voltage after the compensation can't reach the first feedback voltage, then uncontrollable MOS power tube turn-offs.Therefore; starting pin VIN also is connected with current foldback circuit 202 by the overcurrent protection compensating circuit; flow through the electric current that starts pin VIN and generate overcurrent protection bucking voltage, overcurrent protection bucking voltage input overcurrent protection circuit 202 through the overcurrent protection compensating circuit.When the sampled voltage after the compensation reached the overcurrent protection bucking voltage of generation, current foldback circuit 202 output signals control PWM logical circuit 205 turn-offed the MOS power tube.
Described the second feedback voltage reduces along with reducing of output voltage, the second feedback voltage has reflected the situation of change of output voltage, pierce circuit 204 is regulated the frequency of the clock signal of its generation automatically according to the second feedback voltage of input, namely regulate the operating frequency of AC-DC Switching Power Supply, namely control the work period of MOS power tube.The method of frequency that pierce circuit 204 is regulated the clock signal of its generation automatically is: when the second feedback voltage when normal range (NR) (reference voltage range that normal range (NR) is namely set), the frequency of the clock signal of pierce circuit 204 outputs be the benchmark job frequency of resistance R 6 settings by the connection of benchmark job set of frequency pin RI end in advance; When the load minimizing, when the second feedback voltage was reduced to step-down threshold value (described step-down threshold value is a magnitude of voltage of setting) gradually, the frequency of clock signal reduced continuously along with the second reducing of feedback voltage; When the second feedback voltage was reduced to voltage stabilizing threshold value (described voltage stabilizing threshold value is the magnitude of voltage of another setting) always, it is constant that the frequency dimension of clock signal is held in a very low value (being minimum frequency of operation), thereby guarantee the Switching Power Supply normal operation.The transformable clock signal that pierce circuit 204 will generate is exported to the PWM logic control circuit, the PWM logic control circuit according to work period of the FREQUENCY CONTROL MOS power tube of the clock signal of pierce circuit 204 output (work period of described MOS power tube be the MOS power tube this turn-off finish to turn-off the time that finishes next time), thereby the output voltage of Switching Power Supply is carried out frequency adjustment.
The external photo resistance 107(NTC of temperature monitoring pin RT of Switching Power Supply control chip 101).Switching Power Supply control chip 101 inside are connected with PWM logic control circuit 205 by temperature protection circuit 207.When the resistance of external photo resistance 107 reduces along with the rising of switch power supply system temperature; the voltage of temperature monitoring pin RT port also will descend thereupon; when dropping to the voltage threshold that temperature protection circuit establishes; PWM logic control circuit 205 sends for the signal that turn-offs the MOS power tube to drive circuit; drive circuit turn-offs the MOS power tube by the signal of output control pin GATE output shutoff MOS power tube.
Switch power controller of the present invention can be applicable to the switching power circuit of various types of pwm patterns, the AC-DC switching power circuit that is not limited to enumerate in the present embodiment.
Claims (10)
1. switch power controller, it is characterized in that, comprise the FB testing circuit, the output of described FB testing circuit is connected with pierce circuit and current foldback circuit, the output of described pierce circuit is connected output and is connected respectively the PWM logic control circuit with current foldback circuit, the output of described PWM logic control circuit is connected with drive circuit;
Described switch power controller is applied in the switching power circuit, the MOS power tube in the described drive circuit connecting valve power circuit, and described pierce circuit is according to the operating frequency of the output signal control switch power-supply controller of electric of FB testing circuit; Described current foldback circuit is according to the duty ratio of the output signal control generator circuit output signal of FB testing circuit.
2. switch power controller according to claim 1, it is characterized in that, the feedback voltage of the input access switch power source output voltage of FB testing circuit, and obtain the first feedback voltage and the second feedback voltage, export to respectively current foldback circuit and pierce circuit; The benchmark job frequency of the input access Switching Power Supply of pierce circuit, pierce circuit is according to the clock signal of the second feedback voltage output corresponding frequencies, the operating frequency of control switch power-supply controller of electric.
3. switch power controller according to claim 2 is characterized in that, when the second feedback voltage during in the reference voltage range of setting, the operating frequency of switch power controller is the benchmark job frequency; When the second feedback voltage reduced and reach the step-down threshold value of switch power controller setting, the operating frequency of switch power controller reduced gradually along with the second reducing of feedback voltage; When the second feedback voltage during less than or equal to the voltage stabilizing threshold value set, the operating frequency of switch power controller is to keep the minimum frequency of operation of Switching Power Supply work.
4. switch power controller according to claim 3; it is characterized in that; sampled voltage when the input of current foldback circuit accesses the conducting of MOS power tube; current foldback circuit compensates sampled voltage; make sampled voltage increase set point; when the sampled voltage after the compensation reached the first feedback voltage, current foldback circuit output signal control PWM logical circuit turn-offed the MOS power tube.
5. switch power controller according to claim 4, it is characterized in that, the input of current foldback circuit also is connected with the overcurrent protection compensating circuit, the input access input current of described overcurrent protection compensating circuit, input current forms overcurrent protection bucking voltage, overcurrent protection bucking voltage input overcurrent protection circuit through the overcurrent protection compensating circuit; When the sampled voltage after the compensation reached the overcurrent protection bucking voltage, current foldback circuit output signal control PWM logical circuit turn-offed the MOS power tube.
6. switch power controller according to claim 1, it is characterized in that, switch power controller also comprises temperature protection circuit, and the output of temperature protection circuit connects the input of PWM logic control circuit, and the input of temperature protection circuit connects photo resistance; When the input voltage of temperature protection circuit was lower than the setting voltage threshold value, temperature protection circuit was used for turn-offing the signal of MOS power tube to the output of PWM logic control circuit.
7. switch power controller according to claim 1, it is characterized in that, switch power controller also comprises start-up circuit, described start-up circuit comprises charging circuit, the power input VIN of the input connecting valve power-supply controller of electric of described charging circuit, the feeder ear VDD of the output connecting valve power-supply controller of electric of charging circuit, described power input VIN access input voltage charges, starting switch power-supply controller of electric when charging voltage reaches the starting resistor of switch power controller stops charging simultaneously.
8. an application rights requires the AC-DC Switching Power Supply of 1 described switch power controller, it is characterized in that, comprise switch power controller and transformer, the output of drive circuit connects the grid of MOS power tube in the switch power controller, the armature winding of the drain electrode connection transformer of MOS power tube, the armature winding of transformer also is connected with rectification circuit, the two ends of primary winding are connected with the RCD absorption circuit, the source electrode of MOS power tube is by sampling resistor ground connection, the input of current foldback circuit connects the source electrode of MOS power tube in the switch power controller, the power supply port VDD of switch power controller is by the auxiliary winding of diode connection transformer, the secondary winding of transformer is connected with the output voltage feedback circuit, the input of FB testing circuit in the optical coupler connecting valve power-supply controller of electric in the described output voltage feedback circuit; The input of pierce circuit connection reference frequency arranges resistance in the switch power controller, and described reference frequency arranges the other end ground connection of resistance.
9. AC-DC Switching Power Supply according to claim 8, it is characterized in that, in MOS power tube conduction period, access the armature winding of transformer after the rectification of AC-input voltage process rectification circuit with DC input voitage, form the inductive current that increases gradually at the primary winding, this inductive current flows through sampling resistor, forms sampled voltage and accesses current foldback circuit in the switch power controller; At MOS power tube blocking interval, the armature winding of transformer is released to the magnetic energy of storage by the RCD absorption circuit: the secondary winding of transformer is connected with the first rectifier diode, and the secondary winding of transformer provides output voltage by the first rectifier diode; The auxiliary winding of transformer is connected with the second rectifier diode, and the auxiliary winding of transformer is the power supply port VDD power supply of switch power controller by the second rectifier diode.
10. AC-DC Switching Power Supply according to claim 9, it is characterized in that, described output voltage feedback circuit comprises the first resistance and second resistance of series connection, the 3rd resistance, diode and the TL431 of series connection, and the first resistance is connected with the secondary winding of transformer respectively with the 3rd resistance; The output voltage feedback circuit is sampled to output voltage by the first resistance and second resistance of series connection; and the 3rd resistance, diode and TL431 generation feedback current by connecting; feedback current is transferred to FB testing circuit in the switch power controller by optical coupler again; feedback current passed through the FB testing circuit and generated the first feedback voltage and the second feedback voltage, exported to respectively current foldback circuit and pierce circuit.
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| CN108008180A (en) * | 2017-09-25 | 2018-05-08 | 珠海智融科技有限公司 | A kind of current sampling circuit of Switching Power Supply |
| CN108736706A (en) * | 2018-08-01 | 2018-11-02 | 杭州老板电器股份有限公司 | Controllable switch power supply and purification water tank comprising the power supply |
| CN109862653A (en) * | 2018-09-14 | 2019-06-07 | 苏州瑞铬优电子科技有限公司 | A kind of illumination driving circuit for High Power Factor LED |
| CN109818489A (en) * | 2019-01-31 | 2019-05-28 | 矽恩微电子(厦门)有限公司 | An accurate and fast-response step-down switching power supply switching frequency regulator |
| CN109742737B (en) * | 2019-03-19 | 2023-10-03 | 无锡麟力科技有限公司 | Overcurrent protection circuit based on fixed period switching power supply |
| CN109742737A (en) * | 2019-03-19 | 2019-05-10 | 无锡麟力科技有限公司 | Current foldback circuit based on fixed cycle Switching Power Supply |
| CN110299848A (en) * | 2019-06-29 | 2019-10-01 | 南京白牙智能科技有限公司 | A kind of oscillator adaptive controller, control method and switching power converters |
| CN111884512A (en) * | 2020-03-18 | 2020-11-03 | 深圳市航嘉驰源电气股份有限公司 | Switching power supply, power adapter and charger |
| CN112783254A (en) * | 2020-12-23 | 2021-05-11 | 南京交通职业技术学院 | Auxiliary voltage source capable of automatically adjusting output and suitable for building safety |
| CN112865541A (en) * | 2021-01-22 | 2021-05-28 | 成都启臣微电子股份有限公司 | Synchronous rectification controller, synchronous rectification system and synchronous rectification control method |
| CN112865541B (en) * | 2021-01-22 | 2022-03-29 | 成都启臣微电子股份有限公司 | Synchronous rectification controller, synchronous rectification system and synchronous rectification control method |
| WO2022206481A1 (en) * | 2021-03-31 | 2022-10-06 | 华为技术有限公司 | Power conversion circuit and adapter |
| CN113258912A (en) * | 2021-04-29 | 2021-08-13 | 珠海格力电器股份有限公司 | Control device and method of switch tube and electrical equipment |
| CN113258912B (en) * | 2021-04-29 | 2024-05-03 | 珠海格力电器股份有限公司 | Control device and method of switching tube and electrical equipment |
| CN115276418A (en) * | 2022-08-17 | 2022-11-01 | 深圳市诚芯微科技股份有限公司 | High-frequency switching power supply circuit, switching power supply and switching unit |
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