CN113410985A - Direct-current voltage conversion circuit, voltage conversion shunt switch, device and power supply system - Google Patents
Direct-current voltage conversion circuit, voltage conversion shunt switch, device and power supply system Download PDFInfo
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- CN113410985A CN113410985A CN202110729767.8A CN202110729767A CN113410985A CN 113410985 A CN113410985 A CN 113410985A CN 202110729767 A CN202110729767 A CN 202110729767A CN 113410985 A CN113410985 A CN 113410985A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Abstract
The invention provides a direct-current voltage conversion circuit, a voltage conversion shunt switch and a shunt switch device, wherein the direct-current voltage conversion circuit comprises: a voltage input unit for inputting a direct current voltage; the conversion chip is electrically connected with the voltage input unit; the voltage conversion output unit is electrically connected with the conversion chip and used for converting the direct current voltage together with the conversion chip to obtain direct current output voltage so as to output the converted direct current output voltage, the voltage conversion shunt switch comprises an output control unit and N direct current voltage conversion circuits, the N direct current voltage conversion circuits are connected in parallel, the same input voltage is connected among the N direct current voltage conversion circuits, and the output control unit is electrically connected with the N direct current voltage conversion circuits.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a dc voltage converting circuit, a voltage converting shunt switch, and a shunt switch device.
Background
In batch testing of electronic devices, a power supply is an indispensable device and the demand is large. Meanwhile, in order to prevent the unrecoverable influence of voltage instability on the to-be-detected part, a precise voltage-stabilized power supply is generally adopted.
However, the cost of the precision voltage stabilization is high, the difficulty and complexity of the test cost and the test system are increased, a plurality of power supply devices are often required to output different voltages, the use cost is increased, and the test system is more complex.
Therefore, there is a need to provide a novel dc voltage converting circuit, a voltage converting shunt switch and a shunt switch device to solve the above problems in the prior art.
Disclosure of Invention
The invention aims to provide a direct-current voltage conversion circuit, a voltage conversion shunt switch and a shunt switch device, which can convert one path of input direct-current voltage into different direct-current voltages and are convenient to control the magnitude of output voltage.
In a first aspect, to achieve the above object, the dc voltage converting circuit of the present invention includes:
a voltage input unit for inputting a direct current voltage;
the conversion chip is electrically connected with the voltage input unit;
and the voltage conversion output unit is electrically connected with the conversion chip and used for converting the direct current voltage together with the conversion chip to obtain direct current output voltage so as to output the converted direct current output voltage.
The direct-current voltage conversion circuit has the beneficial effects that: the direct-current voltage input by the voltage input unit is subjected to voltage conversion through the conversion chip and the voltage conversion output unit, the input direct-current voltage is converted into direct-current output voltage, the direct-current output voltage is output through the voltage conversion output unit, the input direct-current voltage is converted into different direct-current voltages to be output, and output voltage requirements of different requirements are met.
In some possible embodiments, the voltage conversion output unit includes a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, an inductor, and a transistor, two ends of the first capacitor are respectively and electrically connected with the BST interface and the SW interface of the conversion chip, the SW interface is also connected with one end of the inductor, one end of the inductor is respectively and electrically connected with one end of the first resistor, one end of the second capacitor and the voltage output end, the other end of the first resistor is respectively and electrically connected with one end of the second resistor, one end of the third resistor and the FB interface of the conversion chip, the other end of the third resistor is electrically connected with the cathode of the triode, the anode of the triode is electrically connected with an external digital-to-analog conversion output end, and the other end of the second capacitor and the other end of the second resistor are both grounded. The beneficial effects are that: the proportion between the input direct-current voltage and the output direct-current voltage is adjusted through the first resistor, the second resistor and the third resistor, so that the output direct-current voltage is controlled to meet the output requirements of different magnitudes.
In some possible embodiments, the voltage input unit includes a voltage input terminal and a third capacitor, the voltage input terminal is electrically connected to one end of the third capacitor, the VIN interface and the EN interface of the conversion chip, respectively, and the other end of the third capacitor is grounded.
In a second aspect, the invention discloses a voltage conversion shunt switch, which includes N direct-current voltage conversion circuits, and further includes an output control unit, where the N direct-current voltage conversion circuits are connected in parallel, the N direct-current voltage conversion circuits are connected with one another by a same input voltage, the output control unit is electrically connected with the N direct-current voltage conversion circuits to control the magnitude of the output voltage of each direct-current voltage conversion circuit, and N is a positive integer.
The voltage conversion shunt switch has the advantages that: output through a plurality of direct current voltage converting circuit of output control unit control to make the direct current voltage of input can convert into the direct current voltage output of a plurality of differences, thereby satisfy the power supply demand of different voltages, a plurality of direct current voltage converting circuit convert into a plurality of different voltage output through same input voltage input moreover, can provide the different output voltage of multichannel through input voltage all the way.
In some possible embodiments, the output control unit includes a microcontroller and a digital-to-analog converter, an input end of the microcontroller is connected to the outside, an output end of the microcontroller is electrically connected to an input end of the digital-to-analog converter, and an output end of the digital-to-analog converter is electrically connected to a positive electrode of a triode of the dc voltage conversion circuit.
In some possible embodiments, the microcontroller is communicatively connected with an external program through a USB interface to control the voltage conversion output unit to output different voltages. The beneficial effects are that: the voltage conversion shunt switch is in communication connection with an external program through a USB interface, so that the voltage output of the whole voltage conversion shunt switch is controlled, and the output requirements of different voltage levels are met.
In a third aspect, the present invention further provides a shunt switch device, which is applied to the above voltage-converting shunt switch, and the shunt switch device includes a box body, and the voltage-converting shunt switch is installed inside the box body.
The shunt switch device has the advantages that: through installing voltage conversion shunt switch inside the box, when playing the guard action to voltage conversion shunt switch through the box, with voltage conversion shunt switch integration inside the box, be convenient for install and remove, it is more convenient to use.
In some possible embodiments, an input port, a start switch and an indicator light are arranged on one side of the box body, the input port is electrically connected with the voltage input unit, one end of the start switch is electrically connected with the input port, the other end of the start switch is electrically connected with the voltage input unit, the indicator light is electrically connected with the start switch, and when the start switch is turned on, the indicator light is in a working state.
In some possible embodiments, an output load interface is disposed on a surface of the box, and an output end of the voltage conversion output unit is electrically connected to the output load interface.
In a fourth aspect, the present invention further provides a power supply system, including the above voltage converting shunt switch, and further including a power supply device and N electronic devices, where the power supply device is electrically connected to the N electronic devices through the voltage converting shunt switch to output a voltage to each of the electronic devices, and N is a positive integer.
The power supply system has the beneficial effects that: the power supply device supplies power, the N electronic devices are respectively supplied with power under the action of the voltage conversion shunt switch, a plurality of precise power supplies are not required to be independently supplied with power, the number of the power supply devices is effectively reduced, and the cost is saved.
Drawings
Fig. 1 is a circuit diagram of a dc voltage converting circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of a circuit structure of a voltage conversion shunt switch according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a shunt switch device according to an embodiment of the present invention;
fig. 4 is a schematic back structural diagram of a shunt switch device according to an embodiment of the present invention;
fig. 5 is a block diagram of a power supply system according to an embodiment of the present invention;
fig. 6 is a schematic current trend diagram of a dc voltage converting circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. As used herein, the word "comprising" and similar words are intended to mean that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items.
Before describing the embodiments of the present invention in detail, some terms used in the embodiments of the present invention will be explained below to facilitate understanding by those skilled in the art.
1. A DAC, a digital-to-analog converter, also called a D/a converter, or DAC for short, is a device that converts digital quantities into analog quantities. The D/a converter is basically composed of 4 parts, namely a weight resistor network, an operational amplifier, a reference power supply and an analog switch. Analog-to-digital converters, i.e., a/D converters, referred to as ADCs for short, are generally used to convert continuous analog signals into discrete digital signals.
2. The MCU, a Micro Control Unit (MCU), also called a Single Chip Microcomputer (Single Chip Microcomputer) or a Single Chip Microcomputer, properly reduces the frequency and specification of a Central Processing Unit (CPU), and integrates peripheral interfaces such as a memory (memory), a counter (Timer), a USB, an a/D converter, a UART, a PLC, a DMA, and the like, and even an LCD driving circuit on a Single Chip to form a Chip-level computer, which is controlled in different combinations for different applications.
To solve the problems in the prior art, an embodiment of the present invention provides a dc voltage converting circuit, as shown in fig. 1, including:
a voltage input unit 101 for inputting a direct-current voltage;
a conversion chip 102 electrically connected to the voltage input unit 101;
and a voltage conversion output unit 103 electrically connected to the conversion chip 102, and configured to convert the dc voltage together with the conversion chip 102 to obtain a dc output voltage, so as to output the converted dc output voltage.
In the dc-to-voltage conversion circuit of this embodiment, after the voltage input unit 101 inputs the dc voltage, the input dc voltage is converted into the dc output voltage and output through the combined action of the conversion chip 102 and the voltage conversion output unit 103, so as to complete the conversion of the dc voltage, and meet the requirement of outputting different voltages, thereby facilitating the power supply of different electronic devices.
In some embodiments, the voltage conversion output unit 103 includes a first resistor R1, a second resistor R2, a third resistor R3, and a first capacitor CBSTA second capacitor COUTAn inductor L and a triode D1, the first capacitor CBSTIs electrically connected to the BST interface and the SW interface of the conversion chip 102, the SW interface is further connected to one end of the inductor L, and one end of the inductor L is respectively connected to one end of the first resistor R1 and the second capacitor COUTOne terminal of (1), voltage output terminal VOUTThe other end of the first resistor R1 is electrically connected to one end of the second resistor R2, one end of the third resistor R3, and the FB interface of the conversion chip 102, the other end of the third resistor R3 is electrically connected to the negative electrode of the triode D1, the positive electrode of the triode D1 is electrically connected to an external digital-to-analog conversion output terminal, and the second capacitor C is connected to the output terminal of the second capacitor COUTAnd the other end of the second resistor R2 are both grounded.
In the above circuit, the converter chip 102 determines the magnitude of the dc output voltage according to the magnitudes of the first resistor R1, the second resistor R2, and the third resistor R3 during the process of converting the input dc voltage, that is, the conversion efficiency of the voltage is determined according to the first resistor R1, the second resistor R2, and the third resistor R3.
In some embodiments, the voltage input unit includes a voltage input terminal VINAnd a third capacitance CINSaid voltage input terminal VINAre respectively connected with the third capacitor CINThe VIN interface and the EN interface of the conversion chip are electrically connected, and the third capacitor CINIs grounded through a voltage input terminal VINAn external DC voltage is input to the circuit toAnd voltage conversion is carried out through the direct current voltage conversion circuit, so that direct current output voltages with different sizes are obtained.
In specific calculation, the voltage at the junction of the anode of the triode D1 and the external digital-to-analog conversion output end is recorded as VDACThe voltage drop of transistor D1 is denoted as VD1In the process of voltage conversion by the voltage conversion output unit 103, the current in the voltage conversion output unit 103 goes as shown in fig. 6, and the current flowing out through the resistor R3 is denoted as I3The current flowing through the resistor R1 is denoted as I1The current flowing into the resistor R2 is denoted as I2The voltage at the voltage output terminal connected to R2 is VOUTThe output voltage of the FB interface of the conversion chip 102 is denoted as VBFor conversion chips 102 of different specifications, the voltage V at the input end thereofINAnd the output voltage V of FB interfaceBIs determined by inputting a voltage V at the voltage inputINThen, the output voltage V of FB interfaceBIt is determined that the specific principle of the voltage conversion by the voltage conversion output unit 103 is as follows:
in the circuit of the voltage conversion output unit 103, a current I1、I2、I3Satisfies the following conditions:
I1+I3＝I2and respectively calculate I according to the principle of the circuit1、I2、I3Wherein:
according to the above calculation process, the converted output voltage V can be obtainedOUTSatisfies the following calculation formula:
in some embodiments, the first capacitor CBSTIs 0.1 muF, the second capacitance COUTIs 47 muF, the third capacitance CINIs 10 muf, the inductor L is 3.3 muh, the first resistor R1 is 107k omega, the second resistor R2 is 20k omega, the third resistor R3 is 35.7k omega, and the voltage input terminal V isINThe input voltage of (1) is 12V, then the voltage V at the FB interfaceBAlso, the voltage output by the external digital-to-analog conversion output end is determined to be VDACThen finally after conversion, the voltage output end VOUTThe output voltage of (a) is:
VOUT＝10-3×VDAC
in the scheme, the conversion chip 102 and the voltage conversion output unit 103 perform voltage conversion on the dc voltage input by the voltage input unit 101, convert the input dc voltage into a dc output voltage, and output the dc output voltage through the voltage conversion output unit, so that the input dc voltage is converted into different dc voltages to be output, and the output voltage requirements of different requirements are met.
The present invention further provides a voltage converting shunt switch, as shown in fig. 2, including N direct current voltage converting circuits 201, where the voltage converting shunt switch further includes an output control unit 202, the N direct current voltage converting circuits 201 are connected in parallel, the N direct current voltage converting circuits are connected to a same input voltage, the output control unit 202 is electrically connected to the N direct current voltage converting circuits 201 to control the magnitude of the output voltage of each direct current voltage converting circuit, and N is a positive integer.
As shown in fig. 2, in the present embodiment, the DC voltage converting circuit 201 is denoted as DC-DC, and in the voltage converting and shunting switch of the present embodiment, the output voltages passing through each of the DC voltage converting circuits are denoted as VOUT _1, VOUT _2, VOUT _ 3.
In some embodiments, the output control unit 202 includes a microcontroller 2021 and a digital-to-analog converter DAC2022, an input terminal of the microcontroller 2021 is connected to the outside, an output terminal of the microcontroller 2021 is electrically connected to an input terminal of the digital-to-analog converter 2022, and an output terminal of the digital-to-analog converter 2022 is electrically connected to an anode of the transistor D1 of the dc voltage conversion circuit.
In the specific voltage conversion process, the microcontroller 2021 is denoted as an MCU, the digital-to-analog converter 2022 is denoted as a DAC, and after the external dc voltage 12V is input into each dc voltage conversion circuit 201, the microcontroller 2021 and the digital-to-analog converter 2022 input control signals into each dc voltage conversion circuit 201, so as to control the voltage conversion efficiency of each dc voltage conversion circuit 201, that is, to individually control the magnitudes of the output voltages VOUT _1, VOUT _2, VOUT _3, VOUT.
Specifically, after the microcontroller 2021 inputs a digital signal through the control port, the digital signal is converted into a voltage signal through the digital-to-analog converter 2022, that is, the output voltage of the digital-to-analog converter 2022 is denoted as VDACAccording to the above, the output voltage V of the entire DC voltage conversion circuitOUTSatisfies the following calculation formula:
by changing the input digital signal of the microcontroller 2021 through the control port, the magnitude of the voltage signal of the digital-to-analog converter 2022 after digital-to-analog conversion is changed, so as to adjust VDACSo that in the whole voltage conversion shunt switch, different direct current voltage conversion circuits are controlled to output voltages V with different magnitudesOUT。
In the above-mentioned N dc voltage converting circuits, the resistances of the resistors R1, R2, and R3 in different dc voltage converting circuits are the same or different, and are selected according to actual conditions.
Further, when the voltage V isBVoltage VD1And voltage VDACSatisfy VB+VD1＝VDACWhile, the output voltage VOUTReaches a maximum value, the output voltage VOUTSatisfies the following equation:
in some embodiments, the microcontroller 2021 is communicatively connected to an external program through the USB interface 2023 to input different digital signals, so as to control the voltage conversion output unit to output voltages of different magnitudes.
Specifically, under the connection action of the USB interface, the control signal can be input into the microcontroller 2021 and the digital-to-analog converter 2022 to control each dc voltage converting circuit 201 to output different voltages.
In the prior art, in order to realize the power supply of a plurality of voltages with different sizes, a plurality of digital direct current power supplies are generally adopted, the use cost is increased, through a voltage conversion shunt switch in the scheme, after one-path direct current voltage is input, each direct current voltage conversion circuit 201 can be controlled to output voltages with different sizes through an output control unit 202, the output of multiple paths of different voltages can be realized through one power supply device input voltage, so that power is supplied to a plurality of electronic devices, the expensive precise power supply is not required to be relied on, only a common direct current power supply is required, in batch electronic product testing, the number of the power supply devices can be reduced, the instrument cost is greatly saved, the integration into an automatic testing system is facilitated, and the testing system is simplified.
The invention discloses a shunt switch device, which is applied to the voltage conversion shunt switch, and as shown in fig. 3, the shunt switch device comprises a box body 301, and the voltage conversion shunt switch is arranged in the box body.
The voltage conversion shunt switch is arranged in the box body 301, so that the voltage conversion shunt switch is convenient to install, and the shunt switch device can realize that one path of voltage is converted and outputs a plurality of different voltages, thereby meeting different use requirements.
In some embodiments, as shown in fig. 3, an input port 302, a start switch 303 and an indicator lamp 304 are disposed on one side of the box 301, the input port 302 is electrically connected to the voltage input unit, one end of the start switch 303 is electrically connected to the input port, the other end of the start switch 303 is electrically connected to the voltage input unit, the indicator lamp 304 is electrically connected to the start switch, and when the start switch is turned on, the indicator lamp is in an operating state.
In some embodiments, fig. 4 is a schematic structural diagram of a back surface of a box of the shunt switch device according to the present invention, an output load interface 305 is disposed on a surface of the box 301, and an output end of the voltage conversion output unit is electrically connected to the output load interface 305.
Further, the output interface of the voltage conversion output unit may be multiple, that is, the output voltage of a single DC voltage conversion circuit may output multiple same voltages at the same time, specifically, in fig. 4, four DC voltage conversion circuits DC-DC are included, each DC voltage conversion circuit DC-DC outputs five same voltages, and each DC voltage conversion circuit DC-DC outputs different voltages, that is, 20 outputs in total.
The invention further provides a power supply system, as shown in fig. 5, including the above-mentioned voltage conversion shunt switch 503, the power supply system further includes a power supply device 501 and N electronic devices 502, the power supply device is electrically connected to the N electronic devices 502 through the voltage conversion shunt switch 503 to output a voltage to each electronic device 502, N is a positive integer.
In the power supply system, an input voltage is provided by one power supply device 501, under the switching action of the voltage conversion shunt switch 503, a plurality of different voltages are respectively converted and output to be output to each electronic device 502, and different voltages are respectively provided for the plurality of electronic devices 502, so that power supply is realized, different use requirements are met, only one power supply needs to be used, the cost is effectively saved, and the complexity of the whole power supply system is reduced.
Since the operation principle of the power supply system is substantially the same as that of the voltage conversion shunt switch, the details are not described herein.
The above description is only a specific implementation of the embodiments of the present application, but the scope of the embodiments of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the embodiments of the present application should be covered by the scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.
Although the embodiments of the present invention have been described in detail hereinabove, it is apparent to those skilled in the art that various modifications and variations can be made to these embodiments. However, it is to be understood that such modifications and variations are within the scope and spirit of the present invention as set forth in the following claims. Moreover, the invention as described herein is capable of other embodiments and of being practiced or of being carried out in various ways.
Claims (10)
1. A dc voltage conversion circuit, comprising:
a voltage input unit for inputting a direct current voltage;
the conversion chip is electrically connected with the voltage input unit;
and the voltage conversion output unit is electrically connected with the conversion chip and used for converting the direct current voltage together with the conversion chip to obtain direct current output voltage so as to output the converted direct current output voltage.
2. The DC voltage converting circuit of claim 1, wherein the voltage converting output unit comprises a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, an inductor, and a transistor, two ends of the first capacitor are respectively and electrically connected with the BST interface and the SW interface of the conversion chip, the SW interface is also connected with one end of the inductor, one end of the inductor is respectively and electrically connected with one end of the first resistor, one end of the second capacitor and the voltage output end, the other end of the first resistor is respectively and electrically connected with one end of the second resistor, one end of the third resistor and the FB interface of the conversion chip, the other end of the third resistor is electrically connected with the cathode of the triode, the anode of the triode is electrically connected with an external digital-to-analog conversion output end, and the other end of the second capacitor and the other end of the second resistor are both grounded.
3. The direct-current voltage conversion circuit according to claim 2, wherein the voltage input unit comprises a voltage input terminal and a third capacitor, the voltage input terminal is electrically connected to one end of the third capacitor, the VIN interface and the EN interface of the conversion chip, and the other end of the third capacitor is grounded.
4. A voltage converting shunt switch comprising N dc voltage converting circuits according to any one of claims 1 to 3, wherein the voltage converting shunt switch further comprises an output control unit, N of the dc voltage converting circuits are connected in parallel, the same input voltage is connected between the N of the dc voltage converting circuits, the output control unit is electrically connected to the N of the dc voltage converting circuits to control the magnitude of the output voltage of each of the dc voltage converting circuits, and N is a positive integer.
5. The voltage converting shunt switch according to claim 4, wherein said output control unit comprises a microcontroller and a digital-to-analog converter, an input terminal of said microcontroller is connected to the outside, an output terminal of said microcontroller is electrically connected to an input terminal of said digital-to-analog converter, and an output terminal of said digital-to-analog converter is electrically connected to a positive electrode of a triode of said DC voltage converting circuit.
6. The voltage converting shunt switch according to claim 5, wherein the microcontroller is communicatively connected to an external program via a USB interface to control the voltage converting output unit to output different voltages.
7. A shunt switch apparatus, applied to the voltage-converting shunt switch according to any one of claims 4 to 6, comprising a case in which the voltage-converting shunt switch is installed.
8. The shunt switch device according to claim 7, wherein an input port, a start switch and an indicator light are provided on one side of the case, the input port is electrically connected to the voltage input unit, one end of the start switch is electrically connected to the input port, the other end of the start switch is electrically connected to the voltage input unit, the indicator light is electrically connected to the start switch, and the indicator light is in an operating state when the start switch is turned on.
9. The shunt switch device of claim 7, wherein an output load interface is provided on a surface of the case, and an output of the voltage conversion output unit is electrically connected to the output load interface.
10. A power supply system comprising the voltage converting shunt switch according to any one of claims 4 to 6, the power supply system further comprising a power supply device and N electronic devices, the power supply device being electrically connected to the N electronic devices through the voltage converting shunt switch to output a voltage to each of the electronic devices, N being a positive integer.
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| 周洁敏，等: "《开关电源理论及设计》", 31 May 2019, 北京航空航天大学出版社 * |
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