CN202759386U - Flyback switch power supply circuit and flyback switch power supply - Google Patents
Flyback switch power supply circuit and flyback switch power supply Download PDFInfo
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- CN202759386U CN202759386U CN 201220393557 CN201220393557U CN202759386U CN 202759386 U CN202759386 U CN 202759386U CN 201220393557 CN201220393557 CN 201220393557 CN 201220393557 U CN201220393557 U CN 201220393557U CN 202759386 U CN202759386 U CN 202759386U
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Abstract
The utility model discloses a flyback switch power supply circuit and a flyback switch power supply. The flyback switch power supply circuit comprises a power supply end, a flyback transformer, a main voltage output circuit, a main control circuit and a transformer primary control circuit. The flyback transformer comprises a primary winding and a first secondary winding. The main voltage output circuit comprises a first rectification diode, a first filter capacitor and an electronic switch. The first filter capacitor is a polar capacitor. The anode of the first rectification diode is connected with a homonymous end of the first secondary winding. A synonymous end of the first secondary winding is grounded. The cathode of the first rectification diode is connected with one end of the electronic switch. The other end of the electronic switch is connected with the positive pole of the first filter capacitor. The negative pole of the first filter capacitor is grounded. The control end of the electronic switch is connected with the main control circuit. According to the utility model, at the same time the reliability of the circuit is ensured, the cost of the circuit is reduced.
Description
Technical field
The utility model relates to power technique fields, relates in particular to a kind of inverse-excitation type switch power-supply circuit and inverse-excitation type switch power-supply.
Background technology
When inverse-excitation type switch power-supply refers to armature winding (former limit) conducting when its flyback transformer, its secondary winding (secondary) cut-off, this moment, this flyback transformer was in energy storage state, and when the armature winding (former limit) of flyback transformer ends, its secondary winding (secondary) conducting, stored energy discharged to load before this flyback transformer was incited somebody to action at this moment, made loaded work piece.
As shown in Figure 1, Fig. 1 is the electrical block diagram of a kind of inverse-excitation type switch power-supply circuit in the prior art, and this circuit comprises feeder ear 101, flyback transformer 102, main control circuit 103, principal voltage output circuit 104, standby voltage output circuit 105, principal voltage output 106, standby voltage output 107 and primary control circuit 108.
Particularly, flyback transformer 102 comprises armature winding S1', the first secondary winding S21' and second subprime winding S22', principal voltage output circuit 104 comprises the first rectifier diode D1', the first filter capacitor C1' and an electronic switch K1', the first filter capacitor C1' is polar capacitor, the anode of the first rectifier diode D1' is connected with the Same Name of Ends of the first secondary winding S21' of flyback transformer 102, the different name end ground connection of the first secondary winding S21', the negative electrode of the first rectifier diode D1' is connected with the end of electronic switch K1', the other end of electronic switch K1' is connected with principal voltage output 106, and the control end of electronic switch K1' is connected with main control circuit 103; The positive pole of the first filter capacitor C1' is connected with the negative electrode of the first rectifier diode D1', the minus earth of the first filter capacitor C1', standby voltage output circuit 105 comprises the second rectifier diode D2' and the second filter capacitor C2', the second filter capacitor C2' is polar capacitor, the anode of the second rectifier diode D2' is connected with the Same Name of Ends of the second subprime winding S22' of flyback transformer 102, the different name end ground connection of second subprime winding S22', the negative electrode of the second rectifier diode D2' is connected with the positive pole of the second filter capacitor C2', and be connected the minus earth of the second filter capacitor C2' with standby voltage output 107; Primary control circuit 108 comprises the first metal-oxide-semiconductor Q1' and sampling resistor RS', the first metal-oxide-semiconductor Q1' is the PMOS pipe, the drain electrode of the first metal-oxide-semiconductor Q1' is connected with the Same Name of Ends of the armature winding S1' of flyback transformer 102, the different name end of armature winding S1' is connected with feeder ear 101, the grid of the first metal-oxide-semiconductor Q1' is connected with main control circuit 103, its source electrode is connected with the end of sampling resistor RS', and is connected with main control circuit 103, the other end ground connection of sampling resistor RS'.Circuit shown in Figure 1 also comprises output capacitive loading C3', and the end of output capacitive loading C3' is connected between electronic switch K1' and the principal voltage output 106, the other end ground connection of output capacitive loading C3'.
Wherein, above-mentioned electronic switch K1' is the MOS switching tube, and when electronic switch K1' was the MOS switching tube, the source electrode of MOS switching tube was connected with the negative electrode of the first rectifier diode D1', the drain electrode of MOS switching tube is connected with principal voltage output 106, and the grid of MOS switching tube is connected with main control circuit 103.
The first filter capacitor C1' in the circuit shown in Figure 1 represents the electric capacity on the power panel of this inverse-excitation type switch power-supply, the Voltage-output of electronic switch K1' control principal voltage output 106, because this electronic switch K1' is located between the first filter capacitor C1' and the output capacitive loading C3', so that will there be very large electric current in the first filter capacitor C1' in conducting moment of electronic switch K1', so that electronic switch K1' will be subject to the impact of large electric current in its conducting moment, thereby reduced the reliability of electronic switch K1'.In the prior art, in order to improve the reliability of electronic switch K1', normally adopt powerful MOS switching tube to realize, yet, powerful MOS switching tube expensive, thus the increase of circuit cost caused.
The utility model content
Main purpose of the present utility model provides a kind of inverse-excitation type switch power-supply circuit, when being intended to guarantee the inverse-excitation type switch power-supply circuit reliability, reduces the cost of inverse-excitation type switch power-supply circuit.
In order to achieve the above object, the utility model proposes a kind of inverse-excitation type switch power-supply circuit, comprise be used to the feeder ear that supply power voltage is provided, be used for described supply power voltage is carried out the flyback transformer of inverse-excitation type transformation, a principal voltage output circuit that is used for the output principal voltage, and main control circuit and a primary control circuit, described flyback transformer comprises armature winding and the first secondary winding, the described principal voltage output circuit of described master control circuit controls is exported described principal voltage, and according to the feedback current of the armature winding of described flyback transformer, control the ON time of described armature winding through described primary control circuit;
Described principal voltage output circuit comprises the first rectifier diode, the first filter capacitor and an electronic switch; The anode of described the first rectifier diode is connected with the Same Name of Ends of the first secondary winding of described flyback transformer, the different name end ground connection of described the first secondary winding, the negative electrode of described the first rectifier diode is connected with an end of described electronic switch, the other end of described electronic switch is connected with an end of described the first filter capacitor, this end of described the first filter capacitor is the voltage output end of described principal voltage output circuit, the other end ground connection of described the first filter capacitor, the control end of described electronic switch is connected with described main control circuit.
Preferably, described the first filter capacitor is polar capacitor, and the positive pole of described the first filter capacitor is connected through the negative electrode of described electronic switch with described the first rectifier diode, the minus earth of described the first filter capacitor.
Preferably, described inverse-excitation type switch power-supply circuit comprises that also described flyback transformer also comprises the second subprime winding for the standby voltage output circuit of output standby voltage; The Same Name of Ends of described second subprime winding is connected with described standby voltage output circuit, the different name end ground connection of described second subprime winding.
Preferably, described inverse-excitation type switch power-supply circuit also comprises an output capacitive loading, and an end of described output capacitive loading is connected with the positive pole of described the first filter capacitor, the other end ground connection of described output capacitive loading.
Preferably, described feeder ear is connected with the different name end of the armature winding of described flyback transformer, and the Same Name of Ends of described armature winding is connected with described main control circuit through described primary control circuit.
Preferably, described standby voltage output circuit comprises the second rectifier diode and the second filter capacitor, and described the second filter capacitor is polar capacitor; The anode of described the second rectifier diode is connected with the Same Name of Ends of the second subprime winding of described flyback transformer, the negative electrode of described the second rectifier diode is connected with the positive pole of described the second filter capacitor, the voltage output end of the just very described standby voltage output circuit of described the second filter capacitor, the minus earth of described the second filter capacitor.
Preferably, described primary control circuit comprises the first metal-oxide-semiconductor and sampling resistor; Described the first metal-oxide-semiconductor is the PMOS pipe; The drain electrode of described the first metal-oxide-semiconductor is connected with the Same Name of Ends of the armature winding of described flyback transformer, its grid is connected with described main control circuit, its source electrode is connected with an end of described sampling resistor, and is connected with described main control circuit, the other end ground connection of described sampling resistor.
Preferably, described electronic switch in the described principal voltage output circuit is the MOS switching tube, the source electrode of described MOS switching tube is connected with the negative electrode of described the first rectifier diode, and its drain electrode is connected with the positive pole of described the first filter capacitor, and its grid is connected with described main control circuit.
The utility model also proposes a kind of inverse-excitation type switch power-supply, described inverse-excitation type switch power-supply comprises inverse-excitation type switch power-supply circuit, described inverse-excitation type switch power-supply circuit comprises be used to the feeder ear that supply power voltage is provided, be used for described supply power voltage is carried out the flyback transformer of inverse-excitation type transformation, a principal voltage output circuit that is used for the output principal voltage, and main control circuit and a primary control circuit, described flyback transformer comprises armature winding and the first secondary winding, the described principal voltage output circuit of described master control circuit controls is exported described principal voltage, and according to the feedback current of the armature winding of described flyback transformer, control the ON time of described armature winding through described primary control circuit;
Described principal voltage output circuit comprises the first rectifier diode, the first filter capacitor and an electronic switch; The anode of described the first rectifier diode is connected with the Same Name of Ends of the first secondary winding of described flyback transformer, the different name end ground connection of described the first secondary winding, the negative electrode of described the first rectifier diode is connected with an end of described electronic switch, the other end of described electronic switch is connected with an end of described the first filter capacitor, this end of described the first filter capacitor is the voltage output end of described principal voltage output circuit, the other end ground connection of described the first filter capacitor, the control end of described electronic switch is connected with described main control circuit.
The inverse-excitation type switch power-supply circuit that the utility model proposes, because the electronic switch in the principal voltage output circuit is located at the first filter capacitor of principal voltage output circuit and the front of output capacitive loading, thereby so that the utility model has avoided this electronic switch to be subject to the impact of large electric current in its conducting moment, thereby increased the reliability of this electronic switch, be that the utility model can select lower-powered MOS switching tube as the electronic switch in the principal voltage output circuit, thereby so that the utility model when improving circuit reliability, has reduced the cost of circuit.
Description of drawings
Fig. 1 is the electrical block diagram of a kind of inverse-excitation type switch power-supply circuit in the prior art;
Fig. 2 is the electrical block diagram of the utility model inverse-excitation type switch power-supply circuit preferred embodiment;
Fig. 3 is the corresponding current waveform figure of the utility model inverse-excitation type switch power-supply circuit preferred embodiment when working in continuous current mode;
Fig. 4 is the corresponding current waveform figure of the utility model inverse-excitation type switch power-supply circuit preferred embodiment when working in discontinuous current mode;
Fig. 5 is the corresponding current waveform figure of the utility model inverse-excitation type switch power-supply circuit preferred embodiment when working in critical continuous conduction mode.
The realization of the utility model purpose, functional characteristics and advantage are described further with reference to accompanying drawing in connection with embodiment.
Embodiment
Further specify the technical solution of the utility model below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
Fig. 2 is the electrical block diagram of the utility model inverse-excitation type switch power-supply circuit preferred embodiment.
With reference to Fig. 2, the utility model inverse-excitation type switch power-supply circuit comprises feeder ear 201, flyback transformer 202, main control circuit 203, principal voltage output circuit 204, standby voltage output circuit 205, principal voltage output 206, standby voltage output 207 and primary control circuit 208.Wherein, flyback transformer 202 comprises armature winding S1, the first secondary winding S21 and second subprime winding S22.
Wherein, feeder ear 201 is used for providing supply power voltage, flyback transformer 202 is used for the supply power voltage of feeder ear 201 is carried out the inverse-excitation type transformation, principal voltage output circuit 204 is used for the output principal voltage, standby voltage output circuit 205 is used for the output standby voltage, main control circuit 203 is used for the described principal voltage of control principal voltage output circuit 204 outputs, main control circuit 203 also is used for the feedback current according to the armature winding S1 of flyback transformer 202, controls the ON time of the armature winding S1 of flyback transformers 202 through primary control circuit 208.
Particularly, feeder ear 201 is connected with the different name end of the armature winding S1 of flyback transformer 202, and the Same Name of Ends of armature winding S1 is connected with main control circuit 203 through primary control circuit 208; The Same Name of Ends of the first secondary winding S21 of flyback transformer 202 is connected with principal voltage output 206 through principal voltage output circuit 204, the different name end ground connection of the first secondary winding S21; The Same Name of Ends of the second subprime winding S22 of flyback transformer 202 is connected with standby voltage output 207 through standby voltage output circuit 205, the different name end ground connection of second subprime winding S22.
The utility model inverse-excitation type switch power-supply circuit also comprises an output capacitive loading C3, and the end of output capacitive loading C3 is connected with the positive pole of the first filter capacitor C1, the other end ground connection of output capacitive loading C3.
Wherein, above-mentioned principal voltage output circuit 204 comprises the first rectifier diode D1, the first filter capacitor C1 and electronic switch K1, and the first filter capacitor C1 is polar capacitor.Particularly, the anode of the first rectifier diode D1 is connected with the Same Name of Ends of the first secondary winding S21 of flyback transformer 202, the different name end ground connection of the first secondary winding S21, the negative electrode of the first rectifier diode D1 is connected with the end of electronic switch K1, the other end of electronic switch K1 is connected with the positive pole of the first filter capacitor C1, and be connected with principal voltage output 206 and through output capacitive loading C3 ground connection, the minus earth of the first filter capacitor C1, the control end of electronic switch K1 is connected with main control circuit.Electronic switch K1 in the present embodiment is the MOS switching tube, the source electrode of this MOS switching tube is connected with the negative electrode of the first rectifier diode D1, its drain electrode is connected with the positive pole of the first filter capacitor C1, and is connected with principal voltage output 206, and its grid is connected with main control circuit 203.
Above-mentioned standby voltage output circuit 205 comprises the second rectifier diode D2 and the second filter capacitor C2, and the second filter capacitor C2 is polar capacitor.Particularly, the anode of the second rectifier diode D2 is connected with the Same Name of Ends of the second subprime winding S22 of flyback transformer 202, the negative electrode of the second rectifier diode D2 is connected with the positive pole of the second filter capacitor C2, and is connected the minus earth of the second filter capacitor C2 with standby voltage output 207.
Above-mentioned primary control circuit 208 comprises the first metal-oxide-semiconductor Q1 and sampling resistor RS.In the present embodiment, the first metal-oxide-semiconductor is the PMOS pipe.Particularly, the drain electrode of the first metal-oxide-semiconductor Q1 is connected with the Same Name of Ends of the armature winding S1 of flyback transformer 202, the grid of the first metal-oxide-semiconductor Q1 is connected with main control circuit 203, the source electrode of the first metal-oxide-semiconductor Q1 is connected with the end of sampling resistor RS, and be connected the other end ground connection of sampling resistor RS with main control circuit 203.
The utility model inverse-excitation type switch power-supply circuit has three kinds of mode of operations, is respectively continuous current mode, discontinuous current mode and critical continuous conduction mode.
Wherein, continuous current mode is: when the utility model inverse-excitation type switch power-supply circuit is in fully loaded or heavy condition, the duty cycle of switching of the first metal-oxide-semiconductor Q1 in the primary control circuit 208 is larger, thereby so that when the first rectifier diode D1 in the principal voltage output circuit 204 does not turn-off, the first conducting of metal-oxide-semiconductor Q1 in the primary control circuit 208.Therefore, when the utility model inverse-excitation type switch power-supply circuit worked in continuous current mode, the armature winding S1 of its flyback transformer 202 and the electric current of the first secondary winding S21 were not 0 situation simultaneously.When the utility model works in continuous current mode, the armature winding S1 of its flyback transformer 202 and the current waveform of the first secondary winding S21 are as shown in Figure 3, Ip among Fig. 3 is the current waveform of the armature winding S1 of flyback transformer 202, Is is the current waveform of the first secondary winding S21 of flyback transformer 202, Ton is the ON time of the first metal-oxide-semiconductor Q1, Toff is the deadline of the first metal-oxide-semiconductor Q1, and Ts is the first metal-oxide-semiconductor Q1 switch periods.
Discontinuous current mode is: when the utility model inverse-excitation type switch power-supply circuit was in zero load or light condition, the utility model inverse-excitation type switch power-supply circuit might work in discontinuous current mode.At this moment, the duty cycle of switching of the first metal-oxide-semiconductor Q1 in the primary control circuit 208 is less, the first metal-oxide-semiconductor Q1 in the primary control circuit 208 closes and has no progeny, the electric current linearity of the first secondary winding S21 of flyback transformer 202 reduces, if before the first metal-oxide-semiconductor Q1 conducting, the electric current of the first secondary winding S21 of flyback transformer 202 has been reduced to 0, then the armature winding S1 of flyback transformer 202 and the electric current of the first secondary winding S21 are 0 at this moment, at this moment, the utility model inverse-excitation type switch power-supply circuit works in discontinuous current mode.When the utility model works in discontinuous current mode, the armature winding S1 of its flyback transformer 202 and the current waveform of the first secondary winding S21 are as shown in Figure 4, Ip among Fig. 4 is the current waveform of the armature winding S1 of flyback transformer 202, Is is the current waveform of the first secondary winding S21 of flyback transformer 202, Ton is the ON time of the first metal-oxide-semiconductor Q1, Toff is the deadline of the first metal-oxide-semiconductor Q1, and Ts is the first metal-oxide-semiconductor Q1 switch periods.As shown in Figure 4, when the utility model worked in discontinuous current mode, before a switch periods did not finish, the electric current I p of the first secondary winding S21 of flyback transformer 202 had been reduced to 0, thereby so that interrupted state has appearred in electric current.
Critical continuous conduction mode is a transition between continuous current mode and the discontinuous current mode, critical continuous conduction mode is: the first metal-oxide-semiconductor Q1 in the primary control circuit 208 closes and has no progeny, the electric current linearity of the first secondary winding S21 of flyback transformer 202 reduces, when the first metal-oxide-semiconductor Q1 began conducting, the electric current of the first secondary winding S21 of flyback transformer 202 just was reduced to 0.When the utility model works in critical continuous conduction mode, the armature winding S1 of its flyback transformer 202 and the current waveform of the first secondary winding S21 are as shown in Figure 5, Ip among Fig. 5 is the current waveform of the armature winding S1 of flyback transformer 202, Is is the current waveform of the first secondary winding S21 of flyback transformer 202, Ton is the ON time of the first metal-oxide-semiconductor Q1, Toff is the deadline of the first metal-oxide-semiconductor Q1, and Ts is the first metal-oxide-semiconductor Q1 switch periods.As shown in Figure 5, when the utility model worked in critical continuous conduction mode, when a switch periods finished, the electric current I p of the first secondary winding S21 of flyback transformer 202 just was reduced to 0, and electric current is in continuous and interrupted critical condition.
In the present embodiment, the energy of the armature winding S1 of flyback transformer 202 storage is:
(wherein, Ip is the electric current of armature winding S1; A
LBe inductance coefficent; Np is the coil turn of armature winding S1; F is the operating frequency of flyback transformer 202).
The energy that the first secondary winding S21 of flyback transformer 202 discharges is:
(wherein, Is is the electric current of the first secondary winding S21; A
LBe inductance coefficent; Ns is the coil turn of the first secondary winding S21; F is the operating frequency of flyback transformer 202).
In the situation that ignore leakage inductance, above three kinds of mode of operations of the present utility model (continuous current mode, discontinuous current mode and critical continuous conduction mode) all satisfy: the energy that armature winding S1 stores should more than or equal to the energy of the first secondary winding S21 release, namely satisfy:
P
i〉=P
S(during perfect condition, get "=" number), that is:
Is≤Ip●(Np/Ns)
And when the model of flyback transformer 202 is determined, the coil turn of its armature winding S1 and the coil turn of the first secondary winding S21 thereof are just certain, and, because being the resistance by sampling resistor RS, the maximum of Ip determines, therefore, the maximum of the electric current I s of the first secondary winding S21 is less than a fixed value, thereby so that the maximum of Is is controlled, the peak current that is electronic switch K1 is controlled, thereby can select the MOS switching tube of suitable performance number as the electronic switch K1 of principal voltage output circuit in the utility model, thereby reduce the cost of circuit.
The inverse-excitation type switch power-supply circuit that the utility model proposes, because the electronic switch in the principal voltage output circuit is located at the first filter capacitor of principal voltage output circuit and the front of output capacitive loading, thereby so that the utility model has avoided this electronic switch to be subject to the impact of large electric current in its conducting moment, thereby increased the reliability of this electronic switch, be that the utility model can select lower-powered MOS switching tube as the electronic switch in the principal voltage output circuit, thereby so that the utility model when improving circuit reliability, has reduced the cost of circuit.
The utility model also proposes a kind of inverse-excitation type switch power-supply, this inverse-excitation type switch power-supply comprises inverse-excitation type switch power-supply circuit, the circuit structure of its inverse-excitation type switch power-supply circuit is identical with the circuit structure of the described inverse-excitation type switch power-supply circuit of top embodiment, repeats no more herein.
The above only is preferred embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (9)
1. inverse-excitation type switch power-supply circuit, comprise be used to the feeder ear that supply power voltage is provided, be used for described supply power voltage is carried out the flyback transformer of inverse-excitation type transformation, a principal voltage output circuit that is used for the output principal voltage, and main control circuit and a primary control circuit, described flyback transformer comprises armature winding and the first secondary winding, the described principal voltage output circuit of described master control circuit controls is exported described principal voltage, and according to the feedback current of the armature winding of described flyback transformer, control the ON time of described armature winding through described primary control circuit; It is characterized in that:
Described principal voltage output circuit comprises the first rectifier diode, the first filter capacitor and an electronic switch; The anode of described the first rectifier diode is connected with the Same Name of Ends of the first secondary winding of described flyback transformer, the different name end ground connection of described the first secondary winding, the negative electrode of described the first rectifier diode is connected with an end of described electronic switch, the other end of described electronic switch is connected with an end of described the first filter capacitor, this end of described the first filter capacitor is the voltage output end of described principal voltage output circuit, the other end ground connection of described the first filter capacitor, the control end of described electronic switch is connected with described main control circuit.
2. inverse-excitation type switch power-supply circuit according to claim 1, it is characterized in that, described the first filter capacitor is polar capacitor, and the positive pole of described the first filter capacitor is connected through the negative electrode of described electronic switch with described the first rectifier diode, the minus earth of described the first filter capacitor.
3. inverse-excitation type switch power-supply circuit according to claim 2 is characterized in that, described inverse-excitation type switch power-supply circuit comprises that also described flyback transformer also comprises the second subprime winding for the standby voltage output circuit of output standby voltage; The Same Name of Ends of described second subprime winding is connected with described standby voltage output circuit, the different name end ground connection of described second subprime winding.
4. inverse-excitation type switch power-supply circuit according to claim 3, it is characterized in that, described inverse-excitation type switch power-supply circuit also comprises an output capacitive loading, and an end of described output capacitive loading is connected with the positive pole of described the first filter capacitor, the other end ground connection of described output capacitive loading.
5. inverse-excitation type switch power-supply circuit according to claim 4, it is characterized in that, described feeder ear is connected with the different name end of the armature winding of described flyback transformer, and the Same Name of Ends of described armature winding is connected with described main control circuit through described primary control circuit.
6. inverse-excitation type switch power-supply circuit according to claim 5 is characterized in that, described standby voltage output circuit comprises the second rectifier diode and the second filter capacitor, and described the second filter capacitor is polar capacitor; The anode of described the second rectifier diode is connected with the Same Name of Ends of the second subprime winding of described flyback transformer, the negative electrode of described the second rectifier diode is connected with the positive pole of described the second filter capacitor, the voltage output end of the just very described standby voltage output circuit of described the second filter capacitor, the minus earth of described the second filter capacitor.
7. inverse-excitation type switch power-supply circuit according to claim 6 is characterized in that, described primary control circuit comprises the first metal-oxide-semiconductor and sampling resistor; Described the first metal-oxide-semiconductor is the PMOS pipe; The drain electrode of described the first metal-oxide-semiconductor is connected with the Same Name of Ends of the armature winding of described flyback transformer, its grid is connected with described main control circuit, its source electrode is connected with an end of described sampling resistor, and is connected with described main control circuit, the other end ground connection of described sampling resistor.
8. inverse-excitation type switch power-supply circuit according to claim 7, it is characterized in that, described electronic switch in the described principal voltage output circuit is the MOS switching tube, the source electrode of described MOS switching tube is connected with the negative electrode of described the first rectifier diode, its drain electrode is connected with the positive pole of described the first filter capacitor, and its grid is connected with described main control circuit.
9. an inverse-excitation type switch power-supply is characterized in that, comprises each described inverse-excitation type switch power-supply circuit among the claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220393557 CN202759386U (en) | 2012-08-09 | 2012-08-09 | Flyback switch power supply circuit and flyback switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220393557 CN202759386U (en) | 2012-08-09 | 2012-08-09 | Flyback switch power supply circuit and flyback switch power supply |
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| Publication Number | Publication Date |
|---|---|
| CN202759386U true CN202759386U (en) | 2013-02-27 |
Family
ID=47738545
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220393557 Expired - Fee Related CN202759386U (en) | 2012-08-09 | 2012-08-09 | Flyback switch power supply circuit and flyback switch power supply |
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| CN (1) | CN202759386U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103944398A (en) * | 2014-04-11 | 2014-07-23 | 广东明阳龙源电力电子有限公司 | Double-transistor flyback switching power supply with high voltage input |
| CN107769304A (en) * | 2016-02-05 | 2018-03-06 | 广东欧珀移动通信有限公司 | Charging system, charging method and power supply adaptor for terminal |
| US10910852B2 (en) | 2016-07-26 | 2021-02-02 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Charging system, charging method, and power adapter |
-
2012
- 2012-08-09 CN CN 201220393557 patent/CN202759386U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103944398A (en) * | 2014-04-11 | 2014-07-23 | 广东明阳龙源电力电子有限公司 | Double-transistor flyback switching power supply with high voltage input |
| CN107769304A (en) * | 2016-02-05 | 2018-03-06 | 广东欧珀移动通信有限公司 | Charging system, charging method and power supply adaptor for terminal |
| CN107769304B (en) * | 2016-02-05 | 2020-02-11 | Oppo广东移动通信有限公司 | Charging system, charging method for terminal and power adapter |
| US10727687B2 (en) | 2016-02-05 | 2020-07-28 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Charging system and method for terminal, power adapter and charging device |
| US10910852B2 (en) | 2016-07-26 | 2021-02-02 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Charging system, charging method, and power adapter |
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