CN220022628U - High-power wide-range output circuit - Google Patents

Abstract

The utility model provides a high-power and wide-range output circuit, which comprises a primary side input switch module, a transformer module, a secondary side output switch module and an output module which are sequentially connected in series; the primary side input switch module is used for inputting a power supply to the transformer; the transformer module is used for changing the size of the output power supply; the secondary side output switch module is used for rectifying the voltage output by the transformer module; the output module is used for connecting a load and supplying power to the load; the transformer module comprises M transformers with the same parameters, the number of turns of primary coils of each transformer is the same, and the number of turns of secondary coils of each transformer is the same; every two transformers are a group of transformers, primary coils of the same group of transformers are connected in parallel to obtain (M/2) parallel circuits, and the (M/2) parallel circuits are connected in series to form an input circuit; the transformer module comprises two groups of secondary coils, each group of secondary coils comprises one secondary coil in each transformer in the same group, and each group of secondary coils are connected in series or in parallel to form one output circuit. The utility model reduces the circuit cost.

Description

High-power wide-range output circuit

Technical Field

The utility model relates to the technical field of power electronics, in particular to a high-power and wide-range output circuit.

Background

With the rapid development of electric automobile technology, the output power requirement on the charging module is larger and larger, and the output voltage range is wider and wider (50V-1000V). However, due to the limitation of the external dimensions of the charging module and the limitation of the process of the magnetic device, a small-sized device is required to realize high power output. For example, the voltage is often increased by a plurality of small-sized transformers to achieve a high-power, wide-range output.

For a high-power, wide-range output circuit based on a transformer, the circuit comprises other elements, such as a diode and a capacitor, besides a plurality of transformers, and in order to reduce the selection pressure of the other elements, the output voltages of the output ends of the transformer modules are generally set to be the same.

For example, assuming that the transformer module includes two output terminals, namely a first output terminal and a second output terminal, when the difference between the two output terminals is relatively large, for example, the output voltage of the first output terminal is 800V, and the output voltage of the second output terminal is 200V, in order to ensure stable operation of the transformer module, when the output circuit corresponding to the first output terminal selects a model with a working range matched with 800V of the output voltage, the model also needs to be selected, and obviously, the requirements on the diode and the capacitor are relatively high, so that the model selecting pressure is increased, and the cost is increased. Therefore, the parameters of the transformers are the same during setting so as to make the voltages at the output ends of the transformers the same as much as possible.

However, due to the fact that the tolerance of the magnetic core, the machining tolerance of an air gap, the process tolerance of winding and the like still exist among a plurality of transformers of the same actual model, the differences can lead to non-uniform voltage and non-uniform current of the windings of the transformers, the non-uniform voltage can lead to different magnetic flux densities of the transformers, and the transformers with large partial voltage have large magnetic flux densities and large magnetic losses; and the transformer windings with large current distribution have large copper loss due to no current sharing, and the difference superposition of magnetic loss and copper loss leads to the difference of the losses of a plurality of transformers with the same model. Therefore, it is more necessary to make the current of each primary winding and the current of each secondary winding of the transformer as close as possible, and the output voltage of each output terminal is as close as possible.

The comparative document CN201922180195 discloses a wide-range constant-power bidirectional dc converter comprising: the primary side input switch module, the transformer module, the secondary side output switch module and the voltage equalizing control network are sequentially connected. By setting a high-low voltage mode switching network, the constant power input and output of the voltage in a wide range can be realized. However, in the prior art, a voltage equalizing network needs to be added to make the voltages of the first output network and the second output network equal, so that the circuit cost is increased, and the circuit cost is higher.

Disclosure of Invention

The present utility model provides a high power, wide range output circuit to solve the problems of the prior art.

The utility model provides a high-power and wide-range output circuit, which comprises a primary side input switch module, a transformer module, a secondary side output switch module and an output module which are sequentially connected in series;

the primary side input switch module is used for inputting a power supply to the transformer;

the transformer module is used for changing the voltage of the output power supply;

the secondary side output switch module is used for rectifying the voltage output by the transformer module;

the output module is used for connecting other loads and supplying power to the loads;

the transformer module comprises M transformers with the same parameters, wherein the number of turns of primary side coils of each transformer is the same, and the number of turns of secondary side coils of each transformer is the same, wherein M is an even number greater than or equal to 4;

every two transformers are used as a group of transformers, primary coils of the same group of transformers are connected in parallel to obtain (M/2) parallel circuits, and the (M/2) parallel circuits are sequentially connected in series to form an input circuit;

the transformer module comprises two groups of secondary coils, each group of secondary coils comprises one secondary coil in each transformer in the same group, and each group of secondary coils are connected in series or in parallel to form one output circuit.

Optionally, M is equal to 4, and each group of secondary coils are connected in series to each other to form an output circuit.

Optionally, M is equal to 4, and each group of secondary coils are connected in parallel to each other and serve as one output circuit.

Optionally, the primary side input switch module includes (M/4) full-bridge circuits, each full-bridge circuit corresponds to one input circuit of the transformer module, and two output ends of the full-bridge circuits are electrically connected with two ends of one input circuit of the transformer module.

Optionally, the full-bridge circuit includes two parallel bridge arms, each bridge arm includes two switch circuits connected in series, each switch circuit includes a controllable switch tube and a first diode, the controllable switch tube is connected in parallel with the first diode, two input ends are connected at two ends of the bridge arm connected in series, the output ends are two midpoints of the two switch circuits connected in series, and the two midpoints are marked as a first midpoint and a second midpoint, and the first midpoint and the second midpoint are electrically connected with two ends of one input circuit of the transformer module.

Optionally, the controllable switch tube is a MOS tube, a source electrode of the MOS tube is connected to the positive electrode of the first diode, and a drain electrode of the MOS tube is connected to the negative electrode of the first diode.

Optionally, the primary side input switch module further includes a resistive inductor circuit and a second capacitor, the resistive inductor circuit is connected in series with one end of the two primary side coils connected in series with the first midpoint, and the second capacitor is connected in series with the other end of the two primary side coils connected in series with the second midpoint.

Optionally, the primary side input switch module further includes a first capacitor connected in parallel to an input of the full bridge circuit.

Optionally, a sampling resistor is connected in series between the first capacitor and the full bridge circuit.

Optionally, the secondary side output switch module includes two full-bridge rectifier circuits connected in series, each full-bridge rectifier circuit includes four diodes and a third capacitor, every two diodes are connected in parallel to obtain a first series diode group and a second series diode group, the first series diode group, the second series diode group and the third capacitor are connected in parallel, and two output ends of each output circuit are respectively connected between the two diodes connected in series.

The high-power and wide-range output circuit provided by the embodiment of the utility model comprises a transformer module, wherein the transformer module comprises M transformers with the same parameters, each two transformers are used as a group of transformers, primary coils of each group of transformers are connected in parallel to obtain a plurality of parallel circuits, and the parallel circuits are connected in series to form an input circuit after being connected in series; because the secondary coil of each transformer is not used as one output circuit, all the secondary coils are divided into two groups, each group comprises only one secondary coil in one group of transformers, and each group of secondary coils is connected in series or in parallel with each other to form two output circuits. According to the voltage balancing method, the voltage of the two output circuits of the transformer module is obtained through the combined action of the secondary coils of a plurality of different transformers, instead of one transformer corresponding to one output, so that the voltage of the two output circuits of the transformer module is controlled by one transformer, but is controlled by M transformers, the transformers are mutually restricted and mutually influenced, voltage balancing of the M transformers is achieved, in the voltage balancing process, the primary coils enable the voltages of the secondary coils to be approximately equal, the secondary coils enable the voltages of the primary coils to be approximately equal, the primary coils and the secondary coils interact, the mutual influence is achieved, and the voltage balancing effect is improved. Compared with the prior art, the voltage equalizing circuit realizes the voltage equalizing of a plurality of transformers, and the high-power and wide-range output circuit provided by the embodiment of the utility model realizes the purpose of multi-path output voltage equalizing through the serial-parallel connection of the primary coil and the secondary coil of the transformer, so that the voltage equalizing circuit is omitted, and the cost is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a diagram of a high power, wide range output circuit for each set of secondary windings of a transformer in series with one another, provided by an embodiment of the present utility model;

FIG. 2 is a diagram of a high power, wide range output circuit for each set of secondary windings of a transformer in parallel with one another, provided by an embodiment of the present utility model;

FIG. 3 is a circuit diagram of an implementation of a high power, wide range output circuit according to the one shown in FIG. 1;

FIG. 4 is a circuit diagram of an implementation of a high power, wide range output circuit according to the one shown in FIG. 3;

FIG. 5 is a circuit diagram of an implementation of a high power, wide range output circuit according to the one shown in FIG. 2;

fig. 6 is a circuit variant of a high power, wide range output circuit according to the one shown in fig. 5.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions in the embodiments of the present utility model will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are also within the scope of the utility model. In addition, the embodiments of the present utility model and the features of the embodiments may be combined with each other without collision. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Fig. 3-6 are various exemplary diagrams of high power, wide range output circuits, shown in accordance with embodiments of the present utility model. As shown in fig. 3-6, the circuit includes a primary side input switch module 100, a transformer module 200, a secondary side output switch module 300, and an output module 400, which are sequentially connected in series.

The primary side input switch module 100 is used for inputting power to the transformer;

the transformer module 200 is used for changing the voltage of the output power supply;

the secondary side output switch module 300 is used for rectifying the voltage output by the transformer module 200;

the output module 400 is used for connecting other loads and supplying power to the loads;

referring to fig. 1-6, the transformer module 200 includes M transformers with the same parameters, where the number of turns of primary windings of each transformer is the same, and the number of turns of secondary windings is the same, where M is an even number greater than or equal to 4;

every two transformers are used as a group of transformers, primary coils of the same group of transformers are connected in parallel to obtain (M/2) parallel circuits, and the (M/2) parallel circuits are sequentially connected in series to form an input circuit;

the transformer module 200 includes two sets of secondary windings, each set of secondary windings including one secondary winding of each same set of transformers, each set of secondary windings being connected in series or in parallel to form a path of output circuit.

Wherein, the transformers with the same M parameters can be understood as follows: as many as possible, for example, each transformer includes only one primary coil, and the number of turns of the primary coil is the same; each transformer comprises only one secondary coil, the number of turns of each secondary coil is the same, and further, each primary coil and each secondary coil use the same conductive material.

It should be noted that, even if the M transformers are identical as much as possible, the M transformers are not guaranteed to be identical at a time, and there are some uncontrollable reasons that may cause differences in the respective transformers. For example, the tightness of the turns of each transformer cannot be identical; the winding mode of each coil is also possible to be different when the coils are wound; even if the same wire is used for winding, the resistance cannot be the same. For another example, there is still a difference between transformers of the same parameters due to the tolerance of the core itself, the machining tolerance of the air gap, the machining tolerance of the winding, etc.

Thus, although the parameters of the transformers are the same, they are not identical, and thus, for convenience of description, the transformers are described as different transformers in the present utility model. Further, for ease of description and understanding, different transformers may be numbered, e.g., 01, 02, 03, etc.

Of course, the transformers and coils are not limited to the use of numbers, and may be sequentially identified as a first transformer, a second transformer, a third transformer, and the like.

The number of turns of the primary winding of each transformer is the same, for example, n1=n3=n5=n7 in fig. 1. The number of turns of the secondary winding of each transformer is the same, for example, n2=n4=n6=n8 in fig. 1. Further, the turns ratio of the primary coil to the secondary coil of each transformer is the same, i.e., N1: n2=n3: n4=n5: n6=n7: and N8.

Wherein every two transformers are used as a group of transformers, and are connected in parallel with primary windings of the group of transformers to obtain (M/2) parallel circuits, and the (M/2) parallel circuits are sequentially connected in series to form an input circuit, that is, the transformer module 200 comprises one input circuit.

The transformer module 200 includes two sets of secondary windings, each set of secondary windings includes one secondary winding of the same set of transformers, and each set of secondary windings is connected in series or in parallel to form a path of output circuit, so that the transformer module 200 includes two paths of output circuits.

In addition, each time two transformers are added, a primary side portion of the transformer module 200 is added with one parallel circuit, and two output circuits of a secondary side portion are added with one series or parallel circuit.

Since the primary coil has only one connection method and the secondary coil has two connection methods, the transformer module provided by the embodiment of the utility model has two connection methods. The two connection methods and the process of realizing the voltage equalizing are respectively described as follows.

The first connection method comprises the following steps: each group of primary coils are connected in parallel firstly and then connected in series to form one input circuit; each group of secondary coils are connected in series to form one output circuit. The pressure equalizing principle of the connecting method is as follows:

for the primary coil to the secondary coil, the primary coils in the same group are in parallel connection, so that the voltages of the two primary coils in the same group are equal, and the voltages of the secondary coils corresponding to the two primary coils are also equal because each transformer is a transformer with the same parameters and the turns ratio of the primary coil to the corresponding secondary coil is equal. Further, each group of secondary coils comprises one secondary coil in each same group of transformers, when the same group of secondary coils are connected in series to form one output circuit, the voltages output by each circuit are equal, voltage sharing is achieved, after the secondary coils are subjected to voltage sharing, the primary coils and the secondary coils are mutually affected, and voltage sharing is achieved jointly.

Illustratively, referring to fig. 1, four transformers are T1, T2, T3, and T4, respectively, L1 is the primary winding of T1, N1 is the number of turns of primary winding L1 of T1, V1 is the voltage across primary winding L1 of T1, and I1 is the current flowing through primary winding L1 of T1. L2 is the secondary coil of T1, N2 is the number of turns of the secondary coil L2 of T1, V2 is the voltage across the secondary coil L2 of T1, and I2 is the current flowing through the secondary coil L2 of T1; vout1 and Vout2 are output voltages of two output circuits of the secondary winding. The construction of the other transformers is similar and will not be described in detail herein with reference to the accompanying drawings.

The process of realizing voltage equalizing from the primary coil to the secondary coil comprises the following steps: because the primary coils in the same group are in parallel connection, the voltages of the two primary coils in the same group are equal, namely v1=v3 and v5=v7; since N1: n2=n3: n4=n5: n6=n7: n8, so that the voltages of the secondary windings corresponding to the two primary windings are also equal, that is, v2=v4, v6=v8; thus, v2+v6=v4+v8, that is, vout 1=vout 2, thereby achieving voltage equalizing.

Further, from the secondary coil to the primary coil, the secondary coils are in series connection with the same output circuit, so that the currents of the two secondary coils connected in series are equal in the same output circuit; the turns ratio of the primary coil to the corresponding secondary coil is equal, so that the primary coil is converted, the currents of the series primary coils are equal, and the current sharing of the primary coils is realized.

Illustratively, still referring to fig. 1, the process of achieving current sharing from the secondary coil to the primary coil is: for the same output circuit, the secondary windings are in a series connection relationship, so that in the same output circuit, the currents of the two secondary windings connected in series are equal, namely i2=i6, i4=i8, namely i2+i4=i6+i8; since N1: n2=n3: n4=n5: n6=n7: n8, it is converted into current sharing of the primary coil, i.e. i1=i5, i3=i7, and since after parallel connection of L1 and L3, the primary coil is connected in series with L5 and L7, and current sharing is performed in series, i1+i3=i5+i7, so i1=i3=i5=i7, and current sharing of the primary coil is achieved.

The second connection method is as follows: each group of primary coils are connected in parallel firstly and then connected in series to form one input circuit; each group of secondary coils are connected in parallel to form one output circuit. The pressure equalizing principle of the connecting method is as follows:

for the primary side to the secondary side, the sum of currents of the two groups of primary side coils connected in series is equal; because the turns ratio of the primary coil and the corresponding secondary coil is equal, the current sum of the corresponding secondary coils is equal; in combination with the analysis of the first connection method, the voltages of the same output circuit are equal, the voltages of the secondary coils in the two output circuits are correspondingly equal, and the voltages in the two output circuits are equal, so that output voltage sharing of the secondary coils is realized, and after the secondary coils are subjected to voltage sharing, the primary coils are subjected to voltage sharing, so that the primary coils and the secondary coils are mutually influenced, and the voltage sharing is realized jointly.

Illustratively, referring to fig. 2, from primary to secondary, the transformer module 200 includes two sets of transformers, i.e., two sets of primary windings, two sets of secondary windings, a first set of primary windings being L1 and L3, a second set of primary windings being L5 and L7, the sum of the currents of the two sets of primary windings being equal, i.e., i1+i3=i5+i7, due to the series connection of the first and second sets of primary windings; the primary coil L1 and the primary coil L3 of first group, the secondary coil that corresponds are L2 and L4 in proper order, and the primary coil L5 and the secondary coil L7 of second group, and the secondary coil that corresponds is L6 and L8 in proper order, because primary coil equals with the turns ratio of the secondary coil that corresponds, N1: n2=n3: n4=n5: n6=n7: n8, the sum of the currents of the corresponding secondary windings is equal, i.e., i2+i4=i6+i8; v2+v4=v6+v8. Since the secondary windings are connected in parallel, v2=v6, v4=v8, V2 and V4 are converted into two primary windings L1 and L3, and v1=v3 are connected in parallel, so v2=v4, v2=v4=v6=v8, that is, all secondary windings are balanced, and Vout 1=v2=v6, vout 2=v4=v8 are also balanced, so Vout 1=vout 2 is realized.

For the secondary coils to the primary coils, each group of secondary coils is connected in parallel, the voltages of the two secondary coils included in each group of secondary coils are equal, i.e. v2=v6, v4=v8, and thus v2+v4=v6+v8; because the turn ratio of the primary coil and the corresponding secondary coil is equal, the voltage sum of the primary coil is equal, namely V1 +V3=V5 +V7, so that the primary coil is subjected to voltage equalizing, the secondary coil is subjected to voltage equalizing after the primary coil is subjected to voltage equalizing, and the secondary coil is subjected to voltage equalizing, so that the primary coil and the secondary coil are mutually influenced, and the voltage equalizing is commonly realized.

For simplicity of the drawing, only the input switch module 100, the transformer module 200, the secondary output switch module 300, and the output module 400 are shown in fig. 3, and the coil is not shown in fig. 3 to 6.

In addition, in the prior art, regarding the transformer module 200, one primary winding of the same transformer is used as an input circuit, and a secondary winding of the same transformer is used as an output circuit, so that when the voltage of the transformer is larger than the voltage of other transformers, the output voltage of the transformer is larger than the output voltage of the other transformers. In the utility model, every two transformers are used as a group of transformers, primary coils of each group of transformers are connected in parallel to obtain a plurality of parallel circuits, and the parallel circuits are connected in series to form one input circuit; because the secondary coil of each transformer is not used as one output circuit, but all the secondary coils are divided into two groups, each group comprises only one secondary coil in one group of transformers, and each group of secondary coils are mutually connected in series or in parallel to form two output circuits, even if the voltage of the primary coil or the secondary coil of one transformer is different from that of the coils of other transformers, the difference is also reflected in all the output circuits, so that the output voltages of all the output circuits are equal, and the voltage equalizing is realized.

The high-power and wide-range output circuit provided by the embodiment of the utility model comprises a transformer module 200, wherein the transformer module 200 comprises M transformers with the same parameters, each two transformers are used as a group of transformers, primary coils of each group of transformers are connected in parallel to obtain a plurality of parallel circuits, and the parallel circuits are connected in series to form an input circuit after being connected in series; because the secondary coil of each transformer is not used as one output circuit, all the secondary coils are divided into two groups, each group comprises only one secondary coil in one group of transformers, and each group of secondary coils is connected in series or in parallel with each other to form two output circuits. As can be seen from this disclosure, the voltages of the two output circuits of the transformer module 200 are output by the common action of the secondary windings of the plurality of different transformers instead of one transformer, so that the voltages of the two output circuits of the transformer module 200 are controlled by not only one transformer but M transformers, and the transformers are controlled by each other in a mutually restricting and mutually influencing manner, so as to realize voltage equalizing of the M transformers. Compared with the prior art, the voltage equalizing circuit realizes the voltage equalizing of a plurality of transformers, and the high-power and wide-range output circuit provided by the embodiment of the utility model realizes the purpose of multi-path output voltage equalizing through the serial-parallel connection of the primary coil and the secondary coil of the transformer, so that the voltage equalizing circuit is omitted, and the cost is reduced.

Alternatively, referring to fig. 1, M is equal to 4, and each set of secondary coils are connected in series as one output circuit.

M is equal to 4, i.e. the transformer module 200 comprises 4 transformers, the 4 transformers being divided into two sets of primary windings and two sets of secondary windings.

The circuit analysis shown in fig. 1 is described in detail in the above description.

Alternatively, referring to fig. 2, M is equal to 4, and each set of secondary coils are connected in parallel to each other as a path of output circuit.

The main difference between the embodiment shown in fig. 2 and the embodiment shown in fig. 1 is that each set of secondary windings in fig. 1 is connected in series, and each set of secondary windings in fig. 2 is connected in parallel.

The specific operation of the transformer module 200 shown in fig. 2 is similar to that of the transformer module 200 shown in fig. 1, and will not be described in detail herein.

Optionally, referring to fig. 3 to 6, the primary input switch module 100 includes (M/4) full-bridge circuits 101, each full-bridge circuit 101 corresponds to one input circuit of the transformer module 200, and two output ends of the full-bridge circuit 101 are electrically connected to two ends of one input circuit of the transformer module 200.

The transformer can only receive ac power, so that the full-bridge circuit 101 can be used to convert dc power into ac power to meet the input requirement of the transformer.

The full-bridge circuit 101 includes two parallel bridge arms, each bridge arm includes two series-connected switch circuits, each switch circuit includes a controllable switch tube and a first diode, the controllable switch tube is connected in parallel with the first diode, two input ends are connected at two ends of the series bridge arm, an output end is two midpoints of the two series-connected switch circuits, and the two midpoints are marked as a first midpoint and a second midpoint, and the first midpoint and the second midpoint are electrically connected with two ends of one input circuit of the transformer module 200.

The two ends of one input circuit of the transformer module 200 are two ends of two primary coils connected in series.

Optionally, the controllable switch tube is a MOS tube, a source electrode of the MOS tube is connected to the positive electrode of the first diode, and a drain electrode of the MOS tube is connected to the negative electrode of the first diode.

It should be noted that, the MOS transistor body at the primary side coil side also includes a source-to-drain diode, so the first diode is not necessary, but after the first diode is disposed, current reverse current can be better prevented.

Optionally, the primary side input switch module 100 further includes a first capacitor connected in parallel to an input of the full bridge circuit 101. Further, the number of the first capacitors may be one or more, which is not limited in the embodiment of the present utility model.

The first capacitor is used for filtering the input current and improving the smoothness of the current.

Optionally, a sampling resistor is connected in series between the first capacitor and the full bridge circuit 101. The sampling resistor is used for sampling the magnitude of the current in the circuit.

Optionally, the primary side input switch module 100 further includes a resistive inductor circuit Lr1 and a second capacitor, where the resistive inductor circuit Lr1 is connected in series between the first midpoint and one end of the two primary side coils connected in series, and the second capacitor is connected in series between the second midpoint and the other end of the two primary side coils connected in series.

The resistance inductance circuit Lr1 and the second capacitor are used as a whole, square wave alternating current is converted into sine wave alternating current, and the functions of zero current on and small current off of the switch are achieved.

Optionally, referring to fig. 3 to fig. 6, the secondary side output switch module 300 includes two full-bridge rectifying circuits 301 connected in series, each full-bridge rectifying circuit 301 includes four diodes and a third capacitor, each two diodes are connected in parallel to obtain a first series diode group and a second series diode group, the first series diode group, the second series diode group and the third capacitor are connected in parallel, and two output ends of each output circuit are respectively connected between the two diodes connected in series.

Further, a larger power and a wider range of output are achieved by the series-parallel connection of Vout1 and Vout 2.

It should be noted that fig. 4 is a circuit obtained by connecting two circuits shown in fig. 3 in parallel, so as to further expand the voltage output range and the power output range of the circuit.

Finally, it should be noted that what is not described in the technical solution of the present utility model can be implemented using the prior art. In addition, the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will appreciate that; the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. The high-power and wide-range output circuit is characterized by comprising a primary side input switch module, a transformer module, a secondary side output switch module and an output module which are sequentially connected in series;

the primary side input switch module is used for inputting a power supply to the transformer;

the transformer module is used for changing the voltage of the output power supply;

the secondary side output switch module is used for rectifying the voltage output by the transformer module;

the output module is used for connecting other loads and supplying power to the loads;

the transformer module comprises M transformers with the same parameters, wherein the number of turns of primary side coils of each transformer is the same, and the number of turns of secondary side coils of each transformer is the same, wherein M is an even number greater than or equal to 4;

every two transformers are used as a group of transformers, primary coils of the same group of transformers are connected in parallel to obtain (M/2) parallel circuits, and the (M/2) parallel circuits are sequentially connected in series to form an input circuit;

the transformer module comprises two groups of secondary coils, each group of secondary coils comprises one secondary coil in each transformer in the same group, and each group of secondary coils are connected in series or in parallel to form one output circuit.

2. The high power, wide range output circuit of claim 1, wherein M is equal to 4, and each set of secondary windings are connected in series with each other as a single output circuit.

3. The high power, wide range output circuit of claim 1, wherein M is equal to 4, and wherein each set of secondary windings are connected in parallel to each other as a single output circuit.

4. The high-power, wide-range output circuit of claim 1, wherein the primary side input switch module comprises (M/4) full-bridge circuits, each full-bridge circuit corresponding to one input circuit of a transformer module, and two output terminals of the full-bridge circuits are electrically connected to two ends of one input circuit of the transformer module.

5. The high power, wide range output circuit of claim 4 wherein the full bridge circuit comprises two parallel legs, each leg comprising two series connected switching circuits, each switching circuit comprising a controllable switching tube and a first diode, the controllable switching tubes and the first diodes being connected in parallel, two inputs being connected across the series legs, the outputs being two midpoints of the two series connected switching circuits, noted as a first midpoint and a second midpoint, the first midpoint and the second midpoint being electrically connected across an input circuit of the transformer module.

6. The high-power, wide-range output circuit of claim 5, wherein the controllable switch is a MOS transistor, a source of the MOS transistor is connected to a positive electrode of the first diode, and a drain of the MOS transistor is connected to a negative electrode of the first diode.

7. The high power, wide range output circuit of claim 5 wherein the primary side input switch module further comprises a resistive inductor circuit in series with the first midpoint and one end of the two primary side coils in series and a second capacitor in series with the second midpoint and the other end of the two primary side coils in series.

8. The high power, wide range output circuit of claim 5, wherein the primary side input switch module further comprises a first capacitor connected in parallel to an input of the full bridge circuit.

9. The high power, wide range output circuit of claim 8, wherein a sampling resistor is connected in series between the first capacitor and the full bridge circuit.

10. The high power, wide range output circuit of any one of claims 1-9, wherein the secondary side output switch module comprises two full-bridge rectifying circuits connected in series with each other, each full-bridge rectifying circuit comprises four diodes and a third capacitor, each two diodes are connected in parallel in the same direction to obtain a first series diode group and a second series diode group, the first series diode group, the second series diode group and the third capacitor are connected in parallel with each other, and two output ends of each output circuit are respectively connected between the two diodes connected in series.