CN115566874A - Circuit with wide output voltage range - Google Patents

Abstract

The invention discloses a circuit with a wide output voltage range, which comprises a power output circuit and an output control circuit which are electrically connected in sequence, wherein the power output circuit comprises at least one power module, the power module is provided with a plurality of secondary windings, and the output ends of the secondary windings are connected in parallel or in series by using the output control circuit; when the output ends of the secondary windings are connected in parallel, the output current of the whole power supply module is increased, and the output voltage is kept unchanged; when the output ends of the secondary windings are connected in series, the output voltage of the whole power supply module is increased, and meanwhile the output current is kept unchanged. When a plurality of power modules are connected in parallel or in series for output, not only can the constant-power wide-voltage output of a single module be realized, but also the multi-module capacity expansion of the power supply is facilitated. This technical scheme can be applied to the occasion of various wide power output ranges, for example electric automobile fills electric pile, laser power, various lithium battery charger etc..

Description

A circuit with wide output voltage range

technical field

The invention relates to the technical field of power supply output circuits, in particular to a circuit with a wide output voltage range.

Background technique

In modern life, electronic products are ubiquitous, ranging from mobile phones, Bluetooth headsets, to new energy vehicles, all of which require charging equipment for charging. In practical applications, due to the different operating voltages of various devices and the voltage range of batteries, chargers with different output voltages are required, resulting in more and more types of chargers, and the development of chargers has become more and more cumbersome.

Contents of the invention

In view of this, it is necessary to provide a circuit with a wide output voltage range that adopts a modular superposition design and can adjust the output voltage within a relatively large output voltage range.

A circuit with a wide output voltage range, including a power output circuit and an output control circuit electrically connected in sequence, the power output circuit includes at least one power module, each of the power modules includes a transformer circuit, and the transformer circuit includes Two secondary windings arranged in parallel, the output ends of each of the secondary windings are electrically connected to an output rectifying circuit, each of the output rectifying circuits includes a pair of output ends; each of the power modules includes a first The secondary winding outputs the positive pole, the first secondary winding outputs the negative pole, the second secondary winding outputs the positive pole and the second secondary winding outputs the negative pole; the output control circuit includes a first switch circuit, a second switch circuit and a third switch circuit , the first switch circuit is electrically connected to the output negative pole of the first secondary winding and the positive output pole of the second secondary winding, and the second switch circuit is electrically connected to the negative output pole of the first secondary winding and the negative output pole of the second secondary winding, and the third switch circuit is electrically connected to the positive output pole of the first secondary winding and the positive output pole of the second secondary winding.

Preferably, it also includes an output terminal group, the output terminal group includes a positive output terminal and a negative output terminal, the positive output terminal is connected to the positive output of the first secondary winding, and the negative output terminal is connected to the first The output of the secondary winding is negative.

Preferably, when the power output circuit has two or more power modules, the first secondary windings of multiple power modules output positive poles, the first secondary windings output negative poles, and the first secondary windings output negative poles. The output positive pole of the second secondary winding and the negative output pole of the second secondary winding are arranged in parallel, so that the output terminals of the corresponding secondary windings in different power modules are connected in parallel.

Preferably, the transformer circuit includes one primary winding or two primary windings, and the two primary windings are connected in series or in parallel.

Preferably, the power supply output circuit includes a three-phase LLC resonant circuit, each phase output branch includes one transformer circuit, each transformer circuit includes two secondary windings, and two secondary windings The windings are respectively a first secondary winding and a second secondary winding; in the three transformer circuits, the negative poles of the three first secondary windings are electrically connected to the negative poles of the three second secondary windings respectively The positive poles of the three first secondary windings and the three positive poles of the second secondary windings are respectively connected to two sets of output rectification circuits, and the two sets of output rectification circuits are respectively arranged in parallel.

Preferably, the positive output terminal includes a first switching circuit, and the first switching circuit is used to realize the connection between the positive output terminal and the output positive pole of the first secondary winding and the negative output pole of the first secondary winding. switch.

Preferably, the negative output terminal includes a second switching circuit, and the second switching circuit is used to realize the connection between the negative output terminal and the positive output pole of the second secondary winding and the negative output pole of the second secondary winding. switch.

Preferably, the first switch circuit adopts one of MOS transistor, triode, IGBT, and relay, and the second switch circuit and the third switch circuit respectively adopt one of diode, MOS transistor, triode, IGBT, and relay. A sort of.

Preferably, the output rectification circuit adopts one of a full-wave rectification circuit, a full-bridge rectification circuit, a voltage doubler rectifier circuit, and a current doubler rectifier circuit.

Preferably, the first switching circuit and the second switching circuit adopt relay switching circuits.

In the above circuit with a wide output voltage range, the power module has multiple secondary windings, and the output control circuit is used to connect the output ends of multiple secondary windings in parallel or in series; when multiple secondary windings When the output ends of the secondary windings are connected in parallel, the output current of the entire power module is increased while keeping the output voltage constant; when the output ends of multiple secondary windings are connected in series, the output voltage of the entire power module is increases while keeping the output current constant. When multiple power modules are output in parallel or in series, not only can a single module achieve constant power and wide voltage output, but also facilitate multi-module expansion of the power supply. The technical solution can be applied to various occasions with a wide power output range, such as electric vehicle charging piles, laser power supplies, various lithium battery chargers, and the like. The invention has the advantages of simple structure, easy realization, low cost and convenient popularization.

Description of drawings

FIG. 1 is a schematic diagram of the circuit structure of a single power supply module of a circuit with a wide output voltage range according to an embodiment of the present invention (secondary windings are connected in series/parallel).

Fig. 2 is a schematic diagram of the circuit structure of a single power supply module of a circuit with a wide output voltage range according to an embodiment of the present invention (primary in series and secondary in series/parallel).

Fig. 3 is a schematic diagram of the circuit structure of a single power supply module of a circuit with a wide output voltage range according to an embodiment of the present invention (primary parallel connection and secondary series/parallel connection).

FIG. 4 is a schematic diagram of the circuit structure of two power supply modules of the circuit with a wide output voltage range according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of the circuit structure of multiple power supply modules of the circuit with a wide output voltage range according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of the circuit structure of a three-phase LLC resonant circuit power supply module of a circuit with a wide output voltage range according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of the circuit structure of two three-phase LLC resonant circuit power supply modules of a circuit with a wide output voltage range according to an embodiment of the present invention.

FIG. 8 is a schematic diagram of a circuit structure of a single power supply module of a circuit with a wide output voltage range according to an embodiment of the present invention (full-wave rectification).

FIG. 9 is a schematic diagram of a circuit structure of a single power supply module of a circuit with a wide output voltage range according to an embodiment of the present invention (full-bridge rectification).

Fig. 10 is a schematic diagram of the circuit structure of a single power supply module of a circuit with a wide output voltage range according to an embodiment of the present invention (MOS tube, full-wave rectification).

FIG. 11 is a schematic circuit structure diagram (switching circuit) of a single power supply module of a circuit with a wide output voltage range according to an embodiment of the present invention.

detailed description

This embodiment takes a circuit with a wide output voltage range as an example, and the present invention will be described in detail below in conjunction with specific embodiments and accompanying drawings.

Please refer to Figure 1, which shows a circuit with a wide output voltage range provided by an embodiment of the present invention, including a power output circuit and an output control circuit electrically connected in sequence, the power output circuit includes at least one power module, each of which The power supply module includes a transformer circuit, the transformer circuit includes two secondary windings arranged in parallel, the output terminals of each of the secondary windings are electrically connected to an output rectifier circuit, and each of the output rectifier circuits includes a For the output terminal; each of the power modules includes the first secondary winding output positive pole, the first secondary winding output negative pole, the second secondary winding output positive pole and the second secondary winding output negative pole; the output control circuit includes the first A switch circuit, a second switch circuit and a third switch circuit, the first switch circuit is electrically connected to the negative output pole of the first secondary winding and the positive output pole of the second secondary winding, the second switch circuit electrically connected to the output negative pole of the first secondary winding and the negative output pole of the second secondary winding, and the third switch circuit is electrically connected to the positive output pole of the first secondary winding and the second secondary winding Winding output positive.

Preferably, it also includes an output terminal group, the output terminal group includes a positive output terminal and a negative output terminal, the positive output terminal is connected to the positive output of the first secondary winding, and the negative output terminal is connected to the first The output of the secondary winding is negative.

Specifically, accompanying drawing 1 shows a single power supply module circuit, the secondary of the transformer circuit in the single power supply module circuit includes two secondary windings, which are respectively the first secondary winding and the second secondary winding, The first switch circuit connects the negative output terminal U_out1- of the first secondary winding to the positive output terminal U_out2+ of the second secondary winding; the second switch circuit connects the negative output terminal U_out1- of the first secondary winding to the second secondary winding. The negative output terminal U_out2- of the primary winding; the third switch circuit connects the positive output terminal U_out1+ of the first secondary winding and the positive output terminal U_out2+ of the second secondary winding.

When the first switch circuit is closed and the second switch circuit and the third switch circuit are disconnected, the negative output terminal U_out1- of the first secondary winding of the transformer circuit is connected to the positive output terminal U_out2+ of the second secondary winding. The primary windings are rectified and connected in series, and the output voltage of the power module is the sum of the output voltages of the two secondary windings.

When the first switch circuit is disconnected and the second switch circuit and the third switch circuit are closed, the negative output terminal U_out1- of the first secondary winding of the transformer circuit is connected to the negative output terminal U_out2- of the second secondary winding, and the first The positive output terminal U_out1+ of the secondary winding is connected to the positive output terminal U_out2+ of the second secondary winding. The two secondary windings are rectified and connected in parallel. The output voltage of the power module is the output voltage of one secondary winding, and the output current of the power module is The sum of the output currents of the two secondary windings.

The two connection methods of the two secondary windings of the transformer circuit can output the same power. After the secondary windings of the transformer circuit are rectified, the output voltage of the series connection is twice the output voltage of the parallel connection, and the output current of the series connection is the parallel connection. 1/2 of the output current.

In some other embodiments, when the power output circuit has two or more power modules, the first secondary windings of multiple power modules output positive poles, and the first secondary windings output The negative electrode, the positive output electrode of the second secondary winding and the negative output electrode of the second secondary winding are respectively arranged in parallel, so that the output ends of the corresponding secondary windings in different power modules are connected in parallel.

Preferably, the transformer circuit includes one primary winding or two primary windings, and the two primary windings are connected in series or in parallel.

Specifically, when the transformer circuit includes one primary winding, two secondary windings are arranged on the secondary side, and the two secondary windings are arranged in parallel. When the transformer circuit includes two primary windings, the two secondary windings are arranged corresponding to one primary winding.

Figure 2 and Figure 3 show the application scenarios of multiple primary transformers connected in series and secondary series/parallel with a single power supply module and multiple transformers connected in primary parallel and secondary series/parallel with a single power supply module.

In Fig. 4 and Fig. 5, application scenarios in which multiple power modules are connected in series/parallel are shown.

Specifically, when the system needs to be expanded, multiple modules can be connected in series and in parallel. The transformer circuit in the single power supply module connected in series/parallel has two secondary winding outputs, as shown in Figure 1, Figure 2 and Figure 3, when two power modules are connected in series/parallel, the two power modules include the first power module and The second power module connects the positive output terminal U_1out1+ of the first secondary winding of the first power module with the positive output terminal U_2out1+ of the first secondary winding of the second power module, and connects the first The negative output terminal U_1out1- of the secondary winding is connected with the negative output terminal U_2out1- of the first secondary winding of the second power module, and the positive output terminal U_1out2+ of the second secondary winding of the first power module is connected with the second power supply The positive output terminal U_2out2+ of the second secondary winding of the module is connected together, and the negative output terminal U_1out2- of the second secondary winding of the first power module is connected with the negative output terminal U_2out2- of the second secondary winding of the second power module. Connected together, the positive output terminal U_out+ in the output terminal group is connected to the positive output terminal U_1out1+ of the first secondary winding of the first power module, and the negative output terminal U_out- in the output terminal group is connected to the second secondary winding of the second power module. The negative output terminal U_2out2- of the secondary winding.

The first switch circuit is connected to the negative output terminal U_1out1- of the first secondary winding of the first power module and the positive output terminal U_2out2+ of the second secondary winding of the second power module, and the second switch circuit is connected to the first The negative output terminal U_1out1- of the secondary winding and the negative output terminal U_2out2- of the second secondary winding of the second power module, the third switch circuit connects the positive output terminal U_1out1+ of the first secondary winding of the first power module and the second The positive output terminal U_2out2+ of the second secondary winding of the power module.

When the first switch circuit is closed and the second switch circuit and the third switch circuit are disconnected, the first power module and the second power module are connected in series; when the first switch circuit is disconnected, the second switch circuit and the third switch circuit are closed , the first power supply module and the second power supply module are connected in parallel, and the series/parallel connection of the two power supply modules is realized through switching of the switch circuit. The output power is the sum of the power of the two power modules, the output voltage in parallel connection is the voltage of a single power module, the output current is the sum of the currents of the two power modules, the output voltage in series is the sum of the voltages of the two power modules, and the output current is A voltage module current, the schematic diagram of the circuit structure is shown in Figure 4.

In another embodiment, as shown in FIG. 5, N power supply modules are connected in series and parallel, and the positive output ends of the first secondary windings of the power supply modules 1, 2...n are connected together, and the power supply modules 1, 2...n are connected together. Connect the negative output terminals of the first secondary windings of the power modules 1, 2...n together, connect the positive output terminals of the second secondary windings of the power modules 1, 2...n together, connect the second secondary windings of the power modules 1, 2...n Connect the negative output terminals together.

The first switch circuit is connected to the negative output terminal of the first secondary winding of the first power module and the positive output terminal of the second secondary winding of the nth power module, and the second switch circuit is connected to the first secondary winding of the first power module and the negative output terminal of the second secondary winding of the nth power module, and the third switch circuit connects the positive output terminal of the first secondary winding of the first power module and the second secondary winding of the nth power module positive output terminal.

In the connection switch circuit shown in Fig. 5, multiple power supply modules can be connected in series/parallel. This method is simple in structure, convenient in capacity expansion, and widely used in practice.

In some embodiments, the power supply output circuit includes a three-phase LLC resonant circuit, each phase output branch includes one of the transformer circuits, each of the transformer circuits includes two of the secondary windings, and the two of the The secondary windings are respectively the first secondary winding and the second secondary winding; in the three transformer circuits, the negative poles of the three first secondary windings and the negative poles of the three second secondary windings are respectively Electrically connected, the positive poles of the three first secondary windings and the three positive poles of the second secondary windings are respectively connected to two sets of output rectification circuits, and the two sets of output rectification circuits are respectively arranged in parallel.

Specifically, the three transformer circuits include a first transformer circuit, a second transformer circuit and a third transformer circuit, the first transformer circuit includes a 1-1 secondary winding and a 1-2 secondary winding, and the The second transformer circuit includes a 2-1 secondary winding and a 2-2 secondary winding, and the third transformer circuit includes a 3-1 secondary winding and a 3-2 secondary winding, wherein the 1-1 The negative poles of the secondary winding, the 2-1 secondary winding and the 3-1 secondary winding are connected to each other, the negative poles of the 1-2 secondary winding, the 2-2 secondary winding and the 3-2 secondary winding are connected to each other connect.

In accompanying drawings 6 and 7, application scenarios of single or multiple three-phase LLC resonant circuit power supply modules are shown.

Specifically, as shown in FIG. 6, the first secondary winding T1_NS1 of the first transformer T1, the first secondary winding T2_NS1 of the second transformer T2, and the first secondary winding T3_NS1 of the third transformer T3 are rectified in parallel to form a first The positive output terminal U_out1+ of the secondary winding and the negative output terminal U_out1- of the first secondary winding; the second secondary winding T1_NS2 of the first transformer T1, the second secondary winding T2_NS2 of the second transformer T2 and the first secondary winding T2_NS2 of the third transformer T3 The secondary winding T3_NS2 is rectified in parallel to form the positive output terminal U_out2+ of the second secondary winding and the negative output terminal U_out2− of the second secondary winding.

The first switch circuit connects the negative output terminal U_out1- of the first secondary winding with the positive output terminal U_out2+ of the second secondary winding; the second switch circuit connects the negative output terminal U_out1- of the first secondary winding with the negative output terminal of the second secondary winding U_out2−; the third switch circuit is connected to the positive output terminal U_out1+ of the first secondary winding and the positive output terminal U_out2+ of the second secondary winding.

When the first switch circuit is closed and the second switch circuit and the third switch circuit are disconnected, the negative output terminal U_out1- of the first secondary winding is connected to the positive output terminal U_out2+ of the second secondary winding, and the two output rectifier circuits are connected in series, and the output The voltage is the sum of the voltages of the two output rectification circuits.

When the first switch circuit is open and the second switch circuit and the third switch circuit are closed, the negative output terminal U_out1- of the first secondary winding and the negative output terminal U_out2- of the second secondary winding are connected, and the positive output terminal of the first secondary winding is The terminal U_out1+ is connected to the positive output terminal U_out2+ of the second secondary winding, the two output rectification circuits are connected in parallel, and the output voltage of the power supply is the voltage of one output rectification circuit.

The circuit with a wide voltage output range provided by this technical solution is also suitable for series/parallel connection of two or more three-phase LLC resonant circuit power modules. The connection methods are the same, and will not be repeated here.

Preferably, the first switch circuit adopts one of MOS transistor, triode, IGBT, and relay, and the second switch circuit and the third switch circuit respectively adopt one of diode, MOS transistor, triode, IGBT, and relay. A sort of.

Preferably, the output rectification circuit adopts one of a full-wave rectification circuit, a full-bridge rectification circuit, a voltage doubler rectifier circuit, and a current doubler rectifier circuit.

Specifically, the first switching circuit in accompanying drawings 1 to 7 can be composed of switching devices such as MOS tubes, triodes, IGBTs, and relays with their own drive circuits; the second switching circuit and the third switching circuit can be composed of diodes, MOS tubes, and triodes. , IGBT, relay and other switching devices are combined with their respective drive circuits.

Please refer to an embodiment shown in FIG. 8, wherein the first switch circuit is composed of a MOS transistor Q1, the second switch circuit and the third switch circuit are composed of diodes D1 and D2, and the secondary output rectification circuit of the transformer circuit is a full wave rectification circuit. When the MOS transistor Q1 is turned on, the output terminals are connected in series, and the output voltage is the sum of the output voltages of the two output rectifier circuits; when the MOS transistor Q1 is turned off, the two rectifier outputs are connected in parallel.

Please refer to an embodiment shown in FIG. 9, wherein the first switch circuit is composed of a MOS transistor Q1, the second switch circuit and the third switch circuit are composed of diodes D1 and D2, and the secondary output rectification circuit of the transformer circuit is a full Bridge rectifier circuit. When the MOS transistor Q1 is turned on, the output terminals are connected in series, and the output voltage is the sum of the output voltages of the two output rectifier circuits; when the MOS transistor Q1 is turned off, the two output rectifier circuits are connected in parallel.

Please refer to FIG. 10 to show an embodiment, wherein the first switch circuit, the second switch circuit and the third switch circuit are all composed of MOS transistors, and the secondary output rectification circuit of the transformer circuit is a full-wave rectification circuit. When the MOS transistor Q1 is turned on, and when Q2 and Q3 are turned off, the output terminals are connected in series, and the output voltage is the sum of the output voltages of the two output rectifier circuits; when the MOS transistor Q1 is turned off, and when Q2 and Q3 are turned on, the two output rectifier circuits circuits in parallel.

In some other embodiments, the positive output terminal includes a first switching circuit, and the first switching circuit is used to realize the connection between the positive output terminal and the first secondary winding output positive pole and the first secondary winding output switching between negative poles. The negative output terminal includes a second switching circuit for switching between the negative output terminal, the positive output of the second secondary winding, and the negative output of the second secondary winding. The first switching circuit and the second switching circuit adopt relay switching circuits.

Specifically, in this embodiment, as shown in FIG. 11 , when the first switch circuit and the second switch circuit are disconnected and the third switch circuit is closed, the first switch circuit connects the positive output terminal to the When the first secondary winding outputs the negative pole and the second switching circuit connects the negative output terminal to the second secondary winding output negative pole, the voltage value output by the output terminal group is that of the second secondary winding the difference between the output voltage and the output voltage of the first secondary winding;

When the first switch circuit and the third switch circuit are disconnected and the second switch circuit is closed, the first switch circuit connects the positive output terminal to the positive output terminal of the first secondary winding, and the second switch circuit connects When the negative output terminal is connected to the second secondary winding to output the positive pole, the output voltage value of the output terminal group is the difference between the output voltage of the first secondary winding and the output voltage of the second secondary winding .

Specifically, when changing the turns ratio of the first secondary winding and the second secondary winding, the output voltages of the first secondary winding and the second secondary winding can be changed, through the first switch circuit, the second switch circuit, the third switch circuit, the first switch circuit and the second switch circuit, the output voltage/current of the first secondary winding is added to the output voltage/current of the second secondary winding or subtraction to achieve a wide range output of output voltage/current.

In the description of the circuit structure of each circuit above and the schematic diagram of the circuit structure in the accompanying drawings, only the circuit topology is described and explained, and the specific circuit structure is not defined.

In the above circuit with a wide output voltage range, the power module has multiple secondary windings, and the output control circuit is used to connect the output ends of multiple secondary windings in parallel or in series; when multiple secondary windings When the output ends of the secondary windings are connected in parallel, the output current of the entire power module is increased while keeping the output voltage constant; when the output ends of multiple secondary windings are connected in series, the output voltage of the entire power module is increases while keeping the output current constant. When multiple power modules are output in parallel or in series, not only can a single module achieve constant power and wide voltage output, but also facilitate multi-module expansion of the power supply. The technical solution can be applied to various occasions with a wide power output range, such as electric vehicle charging piles, laser power supplies, various lithium battery chargers, and the like. The invention has the advantages of simple structure, easy realization, low cost and convenient popularization.

It should be noted that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A circuit with a wide output voltage range is characterized by comprising a power output circuit and an output control circuit which are electrically connected in sequence, wherein the power output circuit comprises at least one power module, each power module comprises a transformer circuit, the transformer circuit comprises two secondary windings which are arranged in parallel, the output end of each secondary winding is electrically connected with an output rectifying circuit, and each output rectifying circuit comprises a pair of output ends; each power module comprises a first secondary winding output positive pole, a first secondary winding output negative pole, a second secondary winding output positive pole and a second secondary winding output negative pole; the output control circuit comprises a first switch circuit, a second switch circuit and a third switch circuit, wherein the first switch circuit is electrically connected to the output cathode of the first secondary winding and the output anode of the second secondary winding, the second switch circuit is electrically connected to the output cathode of the first secondary winding and the output cathode of the second secondary winding, and the third switch circuit is electrically connected to the output anode of the first secondary winding and the output anode of the second secondary winding.

2. The wide output voltage range circuit of claim 1, further comprising a set of output terminals including a positive output terminal connected to the first secondary winding output positive and a negative output terminal connected to the second secondary winding output negative.

3. The circuit with wide output voltage range according to claim 1, wherein when the power output circuit has two or more power modules, the first secondary winding output positive electrode, the first secondary winding output negative electrode, the second secondary winding output positive electrode and the second secondary winding output negative electrode of the plurality of power modules are respectively arranged in parallel, so that the output ends of the corresponding secondary windings in different power modules are connected in parallel.

4. The wide output voltage range circuit of claim 1, wherein said transformer circuit comprises one primary winding or two primary windings, said two primary windings being arranged in series or in parallel.

5. The wide output voltage range circuit of claim 1, wherein said power output circuit comprises a three-phase LLC resonant circuit, each phase output branch comprising one said transformer circuit, each said transformer circuit comprising two said secondary windings, a first secondary winding and a second secondary winding; in the three transformer circuits, the cathodes of the three first secondary windings and the cathodes of the three second secondary windings are electrically connected, the anodes of the three first secondary windings and the anodes of the three second secondary windings are respectively connected to the two groups of output rectification circuits, and the two groups of output rectification circuits are respectively arranged in parallel.

6. The wide output voltage range circuit of claim 2, wherein the positive output terminal comprises a first switching circuit for switching between the positive output terminal and the first secondary winding output positive and negative.

7. The wide output voltage range circuit of claim 6, wherein said negative output terminal includes a second switching circuit for effecting switching between said negative output terminal and said second secondary winding output positive and said second secondary winding output negative.

8. The circuit with wide output voltage range according to claim 1, wherein the first switching circuit is one of a MOS transistor, a triode, an IGBT, and a relay, and the second switching circuit and the third switching circuit are one of a diode, a MOS transistor, a triode, an IGBT, and a relay, respectively.

9. The wide output voltage range circuit according to claim 1, wherein the output rectifying circuit employs one of a full-wave rectifying circuit, a full-bridge rectifying circuit, a voltage doubler rectifying circuit, and a current doubler rectifying circuit.

10. The wide output voltage range circuit of claim 7, wherein the first switching circuit and the second switching circuit employ a relay switching circuit.

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