TW201705666A - Multi-output switching power converter - Google Patents

Abstract

A multi-output switching power converter comprises a transformer, a primary side circuit which electrically couples with a DC source and the primary side winding, a rectify and filter circuit which rectifies and filters the induced velocity produced by the secondary side winding of the transformer and outputs a DC voltage, a regulated circuit which acquires the DC voltage and transfers it into another DC voltage with different level according by a control signal, a feedback circuit which detects the another DC voltage and generates a feedback signal, and a regulate control circuit which accepts the feedback signal and generates the control signal to the regulated circuit according to the feedback signal.

Description

Multi-output switching power converter

The present invention relates to a switched power converter, and more particularly to a multiple output switched power converter.

Referring to FIG. 1, a conventional multi-output switching power converter 1 has a transformer T1, a primary side circuit 11 electrically coupled to the primary side winding Lp of the transformer T1, and a first secondary winding of the transformer T1. The first rectifying and filtering circuit 12 electrically coupled to the Ls1 is configured to rectify and filter the induced voltage generated by the first secondary side winding Ls1 to output a first voltage V1 (+12V) to the load 21, and a second to the transformer T1. a second rectifying and filtering circuit 13 electrically coupled to the secondary side winding Ls2, which rectifies and filters the induced voltage generated by the second secondary side winding Ls2 to output a second voltage V2 (+5V) to the load 22, and a The third rectifying and filtering circuit 14 electrically coupled to the third secondary side winding Ls3 of the transformer T1 rectifies and filters the induced voltage generated by the third secondary side winding Ls3 to output a third voltage V3 (+3.3V) supply. The load 23 is further coupled to a voltage stabilizing circuit 15 that receives the third voltage V3 and maintains a stable output of the third voltage V3 according to a control signal from a voltage stabilizing control circuit 16. And a feedback circuit 17 is electrically coupled to the output end of the voltage stabilization circuit 15 to detect The three voltages V3 generate a feedback signal to the voltage stabilization control circuit 16, so that the control signal is generated according to the feedback signal to the voltage stabilization circuit 15.

However, if the above-described multi-output switching power converter 1 outputs a plurality of different voltages, it is necessary to use different secondary side windings Ls1, Ls2, and Ls3 for various output voltages and correspondingly to a rectifying and filtering circuit 12, 13, 14 so that The number of secondary side windings of the transformer T1 is increased and the circuit is more complicated, which not only increases the manufacturing cost of the transformer T1 but also increases the volume of the transformer T1, and cannot effectively save circuit space.

Accordingly, it is an object of the present invention to provide a multi-output switching power converter that can simplify circuits, reduce circuit size, and save manufacturing costs.

Thus, the multi-output switching power converter of the present invention converts a DC power source into a plurality of voltage outputs, and includes: a transformer including a primary side winding and at least one primary side winding; a primary side circuit, and the DC The power source and the primary side winding are electrically coupled to control whether the DC power source is input to the primary side winding; a rectifying and filtering circuit is electrically coupled to the secondary side winding, and an induced voltage generated by the secondary side winding is performed Rectifying and filtering to output a DC voltage; a first voltage stabilizing circuit is electrically coupled to the rectifying and filtering circuit to obtain the DC voltage, and converting the DC voltage into a first voltage according to a first control signal and outputting Wherein the first voltage is different from the DC voltage; a first feedback circuit is electrically coupled to the first voltage stabilizing circuit to detect the first voltage and generate a first feedback signal; and a first voltage stabilizing control circuit electrically coupled to the first feedback circuit, Receiving the first feedback signal, and generating the first control signal to the first voltage stabilization circuit according to the first feedback signal.

In an embodiment, the multi-output switching power converter further includes: a second voltage stabilizing circuit electrically coupled to the first voltage stabilizing circuit to obtain the first voltage, and according to a second control signal Converting the first voltage into a second voltage and outputting, wherein the second voltage is different from the first voltage and the DC voltage; and a second feedback circuit is electrically coupled to the second voltage stabilizing circuit Detecting the second voltage and generating a second feedback signal; and a second voltage stabilization control circuit electrically coupled to the second feedback circuit to receive the second feedback signal, and according to the The second feedback signal generates the second control signal to the second voltage stabilizing circuit.

In one embodiment, the transformer has a first secondary side winding and a second secondary side winding, and the multiple output switching power converter has a first rectifying and filtering circuit and a second rectifying and filtering circuit. a rectifying and filtering circuit is electrically coupled to the first secondary side winding, and rectifying and filtering the induced voltage generated by the first secondary side winding to output a first DC voltage, the second rectifying and filtering circuit and the first The second secondary winding is electrically coupled, and the induced voltage generated by the second secondary winding is rectified and filtered to output a second DC voltage, wherein the second DC voltage is different from the first DC voltage. And the first voltage stabilizing circuit is electrically coupled to the second rectifying and filtering circuit, and according to the first control signal, converting the second DC voltage into the first voltage and outputting, wherein the first voltage level is Different from the first DC voltage and the second DC voltage.

In the above embodiment, the multi-output switching power converter The method further includes: a second voltage stabilizing circuit electrically coupled to the first voltage stabilizing circuit to obtain the first voltage, and converting the first voltage into a second voltage according to a second control signal and outputting The second voltage is different from the first voltage, the first DC voltage, and the second DC voltage. A second feedback circuit is electrically coupled to the second voltage regulator to detect the second voltage. And generating a second feedback signal; and a second voltage stabilization control circuit electrically coupled to the second feedback circuit to receive the second feedback signal, and generating the second feedback signal according to the second feedback signal The second control signal is applied to the second voltage stabilizing circuit.

Or in another embodiment, the multi-output switching power converter further includes: a second voltage stabilizing circuit electrically coupled to the first rectifying and filtering circuit to obtain the first DC voltage, and according to a second control signal, the first DC voltage is converted into a second voltage and output, wherein the second voltage is different from the first voltage, the first DC voltage, and the second DC voltage; The circuit is electrically coupled to the second voltage stabilizing circuit to detect the second voltage and generate a second feedback signal; and a second voltage stabilizing control circuit is electrically coupled to the second feedback circuit, Receiving the second feedback signal, and generating the second control signal to the second voltage stabilization circuit according to the second feedback signal.

Or in another embodiment, the multi-output switching power converter further includes a voltage stabilizing circuit electrically coupled to the second rectifying and filtering circuit, a feedback circuit, and a voltage stabilizing control circuit, the voltage stabilizing circuit Obtaining the second DC voltage, and adjusting the second DC voltage according to a control signal from the voltage stabilization control circuit, the feedback circuit is electrically coupled to the voltage stabilization circuit to detect the second DC Voltage and generate a feedback signal, the voltage control The circuit is electrically coupled to the feedback circuit to receive the feedback signal, and the control signal is generated according to the feedback signal to the voltage stabilization circuit.

And in an embodiment, the multiple output switched power converter can be a forward circuit architecture or a flyback circuit architecture.

The invention obtains the DC voltage outputted by the rectifying and filtering circuit connected to the secondary side winding by the voltage stabilizing circuit, converts it into a preset other DC voltage output, and detects the voltage stabilizing circuit by the feedback circuit The output voltage is supplied to the voltage stabilization control circuit to generate a control signal to control the voltage regulator circuit to regulate its output voltage. Therefore, when a plurality of different output voltages are required, it is not necessary to wind a plurality of different number of secondary side windings on the secondary side of the transformer, and correspondingly to the rectifying and filtering circuit, that is, a plurality of different levels can be generated. In addition to simplifying the transformer circuit and reducing the manufacturing cost of the transformer, the output voltage can also reduce the volume of the transformer relatively, and effectively save the circuit space, and indeed achieve the efficacy and purpose of the present invention.

20‧‧‧Control circuit

21‧‧‧Primary side circuit

22, 22'‧‧‧ Rectifier filter circuit

23‧‧‧First voltage regulator circuit

24‧‧‧First feedback circuit

25‧‧‧First voltage regulator control circuit

26‧‧‧Second voltage regulator circuit

27‧‧‧Second feedback circuit

28‧‧‧Second voltage control circuit

31‧‧‧ Voltage regulator circuit

32‧‧‧Return circuit

33‧‧‧ Voltage Control Circuit

221, 221'‧‧‧ first rectification filter circuit

222, 222'‧‧‧Second rectification filter circuit

T2, T2', T3, T3'‧‧‧ transformers

Vdc‧‧‧DC power supply

V1‧‧‧ DC voltage

V1'‧‧‧ first DC voltage

V2‧‧‧ first voltage

V2'‧‧‧second DC voltage

V3‧‧‧second voltage

Lp‧‧‧ primary side winding

Ls‧‧‧ secondary side winding

Ls1‧‧‧First secondary winding

Ls2‧‧‧second secondary winding

C1‧‧‧ capacitor

Q1‧‧‧Power switch

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a circuit diagram of a conventional multi-output switching power converter; FIG. 2 is a multi-output switching power supply of the present invention. FIG. 3 is a circuit diagram of a first embodiment using a flyback circuit architecture; FIG. 4 is a circuit diagram of a second embodiment of the multiple output switching power converter of the present invention; 5 is a circuit diagram of a second embodiment using a flyback circuit architecture; FIG. 6 is a circuit diagram of a third embodiment of the multi-output switching power converter of the present invention; and FIG. 7 is a third embodiment using a flyback circuit FIG. 8 is a circuit diagram of a fourth embodiment of a multi-output switching power converter of the present invention; and FIG. 9 is a circuit diagram of a fourth embodiment using a flyback circuit architecture.

Referring to FIG. 2, it is a first embodiment of the multi-output switching power converter of the present invention, which adopts a forward topology circuit structure for converting a DC power supply Vdc into a plurality of DC voltage outputs, and mainly includes a The transformer T2, a primary side circuit 21, a rectifying and filtering circuit 22, a first voltage stabilizing circuit 23, a first feedback circuit 24 and a first voltage stabilizing control circuit 25.

The transformer T2 includes a primary side winding Lp and a primary side winding Ls. The primary side circuit 21 is electrically coupled to the DC power source Vdc and the primary side winding Lp for controlling whether the DC power source Vdc is input to the primary side winding Lp, and mainly includes a capacitor C1 connected in parallel with the DC power source Vdc, and an electrical coupling at the primary stage. A power switch Q1 between one end of the side winding Lp and one end of the DC power source Vdc, and the power switch Q1 is controlled by a control circuit 20 to control whether the DC power source Vdc is input to the primary side winding Lp. The rectifying and filtering circuit 22 is electrically coupled to the secondary side winding Ls, and rectifies and filters an induced voltage generated by the secondary side winding Ls to output a DC voltage V1 (for example, +12 V).

The first voltage stabilizing circuit 23 and the rectifying and filtering circuit 22 and the first stable The voltage control circuit 25 is electrically coupled to adjust the DC voltage V1 to a predetermined first voltage V2 different from the DC voltage V1 according to a first control signal provided by the first voltage regulator control circuit 23 (for example, +5V) And outputting, and simultaneously regulating the first voltage V2 to output a stable first voltage V2.

The first feedback circuit 24 is electrically coupled to the first voltage stabilizing circuit 23 and the first voltage stabilizing control circuit 25 to detect the first voltage V2 output by the first voltage stabilizing circuit 23 and generate a first feedback signal to the first a voltage stabilizing control circuit 25 causes the first voltage stabilizing control circuit 25 to generate the first control signal to the first voltage stabilizing circuit 23 according to the first feedback signal, thereby enabling the first voltage stabilizing circuit 23 to stably output and fix The first voltage V2 is such that it is not affected by external factors such as input voltage variation or load weight.

Therefore, in this embodiment, by setting the first voltage stabilizing circuit 23, the first feedback circuit 24, and the first voltage stabilizing control circuit 25, the first DC voltage V1 is obtained from the output end of the rectifying and filtering circuit 22, and is converted into The first voltage V2 is output, and the other secondary side winding is not required to be wound on the secondary side of the transformer T2 and correspondingly coupled with a rectifying and filtering circuit, that is, another output voltage (ie, the first voltage V2) can be generated, so that the transformer The circuit of T2 is relatively simple, except that the manufacturing cost of the transformer T2 is reduced, and the volume of the transformer T2 is relatively reduced, thereby effectively saving circuit space.

Referring to FIG. 3 again, the first embodiment may also adopt a flyback topology circuit architecture, which is different from FIG. 2 in that the transformer T2 in the forward topology circuit architecture of FIG. 2 is in accordance with the secondary side winding Lp and The turns ratio of the primary side winding Ls shifts the DC power supply Vdc proportionally to the secondary side and stores the electrical energy by the output inductor L1 of the rectifying and filtering circuit 22, and the flyback topology of FIG. Transformer T2' in the circuit architecture can store electrical energy and transfer electrical energy to rectifying and filtering circuit 22'.

Referring to FIG. 4, it is a second embodiment of the multi-output switching power converter of the present invention, which adopts a forward topology circuit architecture, and which is different from the first embodiment in that it further includes a second voltage regulator circuit. 26, a second feedback circuit 27 and a second voltage regulation control circuit 28, wherein the second voltage stabilization circuit 26 is electrically coupled to the output end of the first voltage stabilization circuit 23 to obtain the first voltage V2, and The second voltage stabilizing circuit 26 converts the obtained first voltage V2 into a preset second voltage V3 different from the first voltage V2 and the direct current voltage V1 according to a second control signal provided by the second voltage stabilizing control circuit 28 ( For example, +3.3V) and output, and simultaneously regulate the second voltage V3 to maintain the output second voltage V3 at a fixed value.

The second feedback circuit 27 is electrically coupled to the second voltage stabilizing circuit 26 and the second voltage stabilizing control circuit 28 to detect the second voltage V3 output by the second voltage stabilizing circuit 26 and generate a second feedback signal to the second The second voltage stabilizing control circuit 28 causes the second voltage stabilizing control circuit 28 to generate the second control signal to the second voltage stabilizing circuit 26 according to the second feedback signal. Thereby, the second voltage stabilizing circuit 26 can stably output the fixed second voltage V3 so as not to be affected by external factors (for example, input voltage fluctuation or load weight).

Similarly, as can be seen from the above description, when another (or more) DC voltages different from the DC voltage V1, the first voltage V2, and the second voltage V3 are to be generated, the rectification filter circuit 22 is first used. The output terminal of the voltage stabilizing circuit 23 or the second voltage stabilizing circuit 26 takes the DC voltage V1, the first voltage V2 or the second voltage V3 and inputs it to the other (or more relative) The voltage stabilizing circuit converts the input voltage into a different voltage from the DC voltage V1, the first voltage V2, and the second voltage V3 according to the control signal provided by the other (or more corresponding) voltage stabilizing control circuit a DC voltage and providing a detection result to the other (or more corresponding) voltage stabilization control circuit by another (or more corresponding) feedback circuit to generate the control signal to the Another (or more corresponding) voltage stabilizing circuit, that is, another (or more) can be generated without correspondingly increasing the number of secondary side windings of the transformer T2 and the corresponding rectifying and filtering circuit Output voltage at different levels.

As shown in FIG. 5, the second embodiment can also be implemented by using a flyback circuit architecture. The difference from FIG. 4 is that the transformer T2 in the forward topology circuit structure of FIG. 4 is proportionally transferred to the secondary side according to the turns ratio of the secondary side winding Lp and the primary side winding Ls, and The electrical energy is stored by the output inductor L1 of the rectifying and filtering circuit 22, and the transformer T2' in the flyback topology of FIG. 5 can store electrical energy and transfer the electrical energy to the rectifying and filtering circuit 22'.

Referring to FIG. 6, a third embodiment of the multi-output switching power converter of the present invention adopts a forward topology circuit architecture, and is different from the first embodiment in that the transformer T3 has a different number of turns. a first secondary side winding Ls1 and a second secondary side winding Ls2, and the present embodiment includes a first rectifying and filtering circuit 221 electrically coupled to the first secondary side winding Ls1, and a second secondary side winding Ls2 The second rectifying and filtering circuit 222 is electrically coupled, wherein the first rectifying and filtering circuit 221 rectifies and filters the induced voltage generated by the first secondary side winding Ls1 to output a first DC voltage V1' ( For example, +12V), the second rectifying and filtering circuit 222 rectifies and filters the induced voltage generated by the second secondary side winding Ls2 to output a second DC voltage V2' different from the first DC voltage V1' (for example, +5V). The first voltage stabilizing circuit 23 is electrically coupled to the second rectifying and filtering circuit 222, and converts the second DC voltage V2' into a different DC voltage than the first DC voltage according to the first control signal provided by the first voltage stabilizing control circuit 25. The first voltage V2 (for example, +3.3 V) of V1' and the second DC voltage V2' is output and simultaneously regulates the first voltage V2.

In the embodiment, a voltage stabilizing circuit 31 is electrically coupled to the output end of the second rectifying and filtering circuit 222 to stabilize the second DC voltage V2' output by the second rectifying and filtering circuit 222, and the voltage stabilizing circuit 31 It is operated according to a control signal provided by a voltage regulator control circuit 32, and a feedback circuit 33 detects the second DC voltage V2' and provides a detection result to the voltage stabilization control circuit 32 to generate the control signal.

In addition, as shown in FIG. 7, the third embodiment can also be implemented by using a flyback circuit architecture. The difference from FIG. 6 is that the transformer T3 in the forward topology circuit structure of FIG. 6 is a DC power supply according to the turns ratio of the first secondary side winding Ls1 and the second secondary side winding Ls2 to the primary side winding Ls. The Vdc is proportionally transferred to the secondary side, and the electrical energy is stored by the corresponding first rectifying and filtering circuit 221 and the output reductor L1 of the second rectifying and filtering circuit 222, and the transformer T3' in the flyback topology of FIG. The electrical energy can be stored and transferred to the corresponding first rectifying and filtering circuit 221' and the second rectifying and filtering circuit 222'.

Referring again to FIG. 8, a fourth embodiment of the multi-output switching power converter of the present invention adopts a forward topology circuit architecture, and The difference from the third embodiment further includes a second voltage stabilizing circuit 26, a second feedback circuit 27 and a second voltage stabilizing control circuit 28, wherein the second voltage stabilizing circuit 26 and the first voltage stabilizing circuit 23 The output terminal is electrically coupled to obtain the first voltage V2, and the second voltage stabilizing circuit 26 converts the obtained first voltage V2 into a preset one according to a second control signal provided by the second voltage regulator control circuit 28. Different from the first DC voltage V1', the second DC voltage V2', and the second voltage V3 of the first voltage V2 (for example, +2.5V), and outputting, and simultaneously regulating the second voltage V3, so that the second voltage V3 Maintain at a fixed value. Of course, the second voltage stabilizing circuit 26 can also be electrically coupled to the output end of the first rectifying and filtering circuit 221 to obtain the first DC voltage V1' and convert it into a second voltage V3 output.

The second feedback circuit 27 is electrically coupled to the second voltage stabilizing circuit 26 and the second voltage stabilizing control circuit 28 to detect the second voltage V3 output by the second voltage stabilizing circuit 26 and generate a second feedback signal to the second The second voltage stabilizing control circuit 28 causes the second voltage stabilizing control circuit 28 to generate the second control signal to the second voltage stabilizing circuit 26 according to the second feedback signal. Thereby, the second voltage stabilizing circuit 26 can stably output the fixed second voltage V3 so as not to be affected by external factors (for example, input voltage fluctuation or load weight).

Therefore, as can be seen from the above description, when another (or more) DC voltages different from the first DC voltage V1', the second DC voltage V2', the first voltage V2, and the second voltage V3 are to be generated, Obtain an output voltage from an output of the first rectification filter circuit 221, the second rectification filter circuit 222, the first voltage stabilization circuit 23, or the second voltage stabilization circuit 26, and input it to another (or more corresponding) Voltage regulator circuit that makes another one (or more) a corresponding control signal provided by the voltage stabilizing control circuit, converting the input voltage into a voltage different from the aforementioned DC voltage, and providing detection by another (or more corresponding) feedback circuit The result is given to the other (or more corresponding) voltage stabilizing control circuit, so that the control signal is generated to control the other (or more corresponding) voltage stabilizing circuit for voltage regulation, so that no corresponding increase is required In the case of the number of secondary side windings of transformer T3 and the corresponding rectifying and filtering circuit, another (or more) output voltages of different levels are generated.

And similarly, the fourth embodiment can also be implemented by using a flyback circuit architecture as shown in FIG. 9. The difference from FIG. 8 is that the transformer T3 in the forward topology of FIG. 8 is a DC power supply according to the turns ratio of the first secondary side winding Ls1 and the second secondary side winding Ls2 to the primary side winding Ls. The Vdc is proportionally transferred to the secondary side, and the electrical energy is stored by the corresponding first rectifying and filtering circuit 221 and the output reductor L1 of the second rectifying and filtering circuit 222, and the transformer T3' in the flyback topology of FIG. The electrical energy can be stored and transferred to the corresponding first rectifying and filtering circuit 221' and the second rectifying and filtering circuit 222'.

In summary, in the above embodiment, the constant current voltage is obtained from the output end of the rectifying and filtering circuit connected to the secondary side winding by the voltage stabilizing circuit, and converted into a preset other DC voltage output, and is returned by The circuit detects the output voltage of the voltage regulator circuit, and provides the detection result to the voltage stabilization control circuit, so as to generate a control signal to control the voltage regulator circuit to regulate the output voltage. Therefore, when a plurality of output voltages are required, it is not necessary to wind a plurality of different number of secondary side windings on the secondary side of the transformer, and correspondingly to the rectifying and filtering circuit, that is, an output of a plurality of different levels can be generated. Voltage, in addition to being able to change The circuit of the compressor is simplified, and the manufacturing cost of the transformer can be reduced, and the volume of the transformer is relatively reduced, and the circuit space is effectively saved, and the effect and purpose of the present invention are indeed achieved.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.

20‧‧‧Control circuit

21‧‧‧Primary side circuit

22‧‧‧Rectifier filter circuit

23‧‧‧First voltage regulator circuit

24‧‧‧First feedback circuit

25‧‧‧First voltage regulator control circuit

T2‧‧‧ transformer

Vdc‧‧‧DC power supply

V1‧‧‧ DC voltage

V2‧‧‧ first voltage

Lp‧‧‧ primary side winding

Ls‧‧‧ secondary side winding

C1‧‧‧ capacitor

Q1‧‧‧Power switch

Claims (8)

A multi-output switching power converter for converting a DC power supply into a plurality of DC voltage outputs, and comprising: a transformer comprising a primary side winding and at least one secondary side winding; a primary side circuit, and the DC power supply And the primary side winding is electrically coupled to control whether the DC power source is input to the primary side winding; a rectifying and filtering circuit is electrically coupled to the secondary side winding, and rectifies an induced voltage generated by the secondary side winding Filtering to output a DC voltage; a first voltage stabilizing circuit is electrically coupled to the rectifying and filtering circuit to obtain the DC voltage, and according to a first control signal, converting the DC voltage into a first voltage and outputting, wherein The first voltage is electrically coupled to the first voltage stabilizing circuit to detect the first voltage and generate a first feedback signal; a voltage stabilizing control circuit electrically coupled to the first feedback circuit to receive the first feedback signal, and generating the first control signal according to the first feedback signal to the first voltage stabilizing circuit The multi-output switching power converter of claim 1, further comprising: a second voltage stabilizing circuit electrically coupled to the first voltage stabilizing circuit to obtain the first voltage and according to a second control signal Converting the first voltage into a second voltage and outputting, wherein the second voltage is different from the first voltage and the DC voltage; a second feedback circuit electrically coupled to the second voltage stabilizing circuit to detect the second voltage and generate a second feedback signal; and a second voltage stabilizing control circuit and the second feedback circuit Electrically coupled to receive the second feedback signal, and generate the second control signal to the second voltage stabilization circuit according to the second feedback signal. The multi-output switching power converter of claim 1, wherein the transformer has a first secondary side winding and a second secondary side winding, and the multiple output switching power converter has a first rectifying and filtering circuit And a second rectifying and filtering circuit, the first rectifying and filtering circuit is electrically coupled to the first secondary side winding, and rectifying and filtering the induced voltage generated by the first secondary side winding to output a first DC voltage The second rectifying and filtering circuit is electrically coupled to the second secondary side winding, and rectifies and filters the induced voltage generated by the second secondary side winding to output a second DC voltage, wherein the second DC voltage The level of the first DC voltage is different from the first DC voltage, and the first voltage stabilizing circuit is electrically coupled to the second rectifier filter circuit, and the second DC voltage is converted into the first voltage according to the first control signal. And an output, wherein a level of the first voltage is different from the first DC voltage and the second DC voltage. The multi-output switching power converter of claim 3, further comprising: a second voltage stabilizing circuit electrically coupled to the first voltage stabilizing circuit to obtain the first voltage and according to a second control signal Converting the first voltage into a second voltage and outputting, wherein the second voltage is different from the first voltage, the first DC voltage, and the second DC voltage; a second feedback circuit, and the The second voltage stabilizing circuit is electrically coupled to detect Measuring the second voltage and generating a second feedback signal; and a second voltage stabilization control circuit electrically coupled to the second feedback circuit to receive the second feedback signal, and according to the second feedback The signal generates the second control signal to the second voltage stabilizing circuit. The multi-output switching power converter of claim 3, further comprising: a second voltage stabilizing circuit electrically coupled to the first rectifying and filtering circuit to obtain the first DC voltage, and according to a second control a signal, the first DC voltage is converted into a second voltage and output, wherein the second voltage is different from the first voltage, the first DC voltage, and the second DC voltage; a second feedback circuit, Electrically coupled to the second voltage stabilizing circuit to detect the second voltage and generate a second feedback signal; and a second voltage stabilizing control circuit electrically coupled to the second feedback circuit to receive the a second feedback signal, and generating the second control signal to the second voltage stabilization circuit according to the second feedback signal. The multi-output switching power converter of claim 3, further comprising: a voltage stabilizing circuit electrically coupled to the second rectifying and filtering circuit, a feedback circuit, and a voltage stabilizing control circuit, wherein the voltage stabilizing circuit obtains the a second DC voltage, and the second DC voltage is regulated according to a control signal from the voltage stabilization control circuit, the feedback circuit is electrically coupled to the voltage stabilization circuit to detect the second DC voltage and A feedback signal is generated, and the voltage stabilization control circuit is electrically coupled to the feedback circuit to receive the feedback signal, and the control signal is generated according to the feedback signal to the voltage stabilization circuit. Multi-output switching power conversion as described in any one of claims 1 to 6. The device is a forward-oriented circuit architecture. The multi-output switching power converter of any one of claims 1 to 6 adopts a flyback circuit architecture.