CN217183184U - Self-adaptive adjusting circuit for push-pull booster circuit transformer - Google Patents

Abstract

The application relates to a self-adaptive adjusting circuit of a push-pull booster circuit transformer, which comprises a transformer, a power circuit, a switching circuit, a rectifying circuit and an adjusting circuit; the primary winding of the transformer is respectively connected with a power circuit and a switch circuit, and the power circuit is connected with the switch circuit; the secondary winding of the transformer is connected with a rectifying circuit and a regulating circuit, and the rectifying circuit is electrically connected with the regulating circuit; the first power supply input by the power supply circuit outputs a second power supply after being boosted by the transformer and rectified by the rectifying circuit. The beneficial effects are that: this application is under the prerequisite of guaranteeing other functional integrality, through changing the push-pull boost circuit among the prior art, can realize being suitable for the wide range of input voltage, thereby reaches the function that the dynamic adjustment number of turns is in normal range to control secondary output voltage, makes the security of dc-to-ac converter promote greatly.

Description

Self-adaptive adjusting circuit for push-pull booster circuit transformer

Technical Field

The application relates to the technical field of battery management systems, in particular to a self-adaptive adjusting circuit for a push-pull booster circuit transformer.

Background

At present, a push-pull booster circuit is an important application circuit in a portable outdoor energy storage scheme, and an MOS (metal oxide semiconductor) tube, a transformer and an inductor are extremely important devices in the push-pull booster circuit. The utility model discloses the circuit is applied to portable dc-to-ac converter to self-adaptation push-pull boost that this paper introduced, has great practical meaning and application space.

The transformer winding of the push-pull booster circuit determines the turn ratio of the original secondary side, so that the boosting ratio is also determined. Most of existing battery packs adopt ternary lithium battery cells (3.0V-4.2V), the voltage range is wide, and if the input voltage of a primary battery end is too high, the voltage of a secondary bus can be increased at the same time. Similarly, if the input voltage at the primary battery terminal is too low, the secondary bus voltage is reduced to a level lower than the desired value. In the inverter, the bus voltage obtained by push-pull boosting is used for a later-stage inversion part, and the inversion output voltage and the inversion efficiency are directly influenced, so that whether the bus voltage is in a proper voltage range is important. In the conventional application circuit at present, when the input voltage range is wide, the solution is to adopt a closed-loop control strategy, and stabilize the bus voltage by controlling the duty ratio of a push-pull MOS tube and increasing an inductor L behind a rectifier bridge.

However, this method has problems that: since the duty cycle is continuously adjusted in a closed loop, a large filter inductor is required for filtering, otherwise the bus capacitor is damaged due to large ripple.

SUMMERY OF THE UTILITY MODEL

The application provides a self-adaptive adjusting circuit of a push-pull booster circuit transformer, in order to solve the problem that a push-pull booster circuit in the prior art must use a large filter inductor for filtering because the duty ratio is continuously adjusted in a closed loop, otherwise, the problem that a bus capacitor is damaged due to large ripples is caused.

A self-adaptive regulating circuit of a push-pull booster circuit transformer comprises a transformer, a power circuit, a switching circuit, a rectifying circuit and a regulating circuit;

the primary winding of the transformer is respectively connected with a power circuit and a switch circuit, and the power circuit is connected with the switch circuit; the secondary winding of the transformer is connected with a rectifying circuit and a regulating circuit, and the rectifying circuit is electrically connected with the regulating circuit;

the first power supply input by the power supply circuit outputs a second power supply after being boosted by the transformer and rectified by the rectifying circuit.

Optionally, the primary winding of the transformer is provided with a first input end, a second input end, and a third input end; the positive end of the power circuit is connected with the first input end, and the negative end of the power circuit is connected with the switch circuit; the switch circuit is connected with the first input end, and the third input end is connected with a primary power ground.

Optionally, the power supply circuit comprises at least one energy storage battery.

Optionally, the switch circuit includes a switch chip, a first MOS transistor, and a second MOS transistor, where the switch chip is provided with a first driving signal terminal and a second driving signal terminal;

the grid electrode of the first MOS tube is connected with a first driving signal end, the drain electrode of the first MOS tube is connected with the first input end, and the source electrode of the first MOS tube is connected with the cathode end of the power circuit and the source electrode of the second MOS tube;

and the grid electrode of the second MOS tube is connected with a second driving signal end, and the drain electrode of the second MOS tube is connected with a primary side power ground.

Optionally, the secondary winding of the transformer is provided with a first output end, a second output end and a third output end;

the rectifying circuit is connected with the first output end and is connected with the second output end or the third output end through the regulating circuit.

Optionally, the rectifying circuit comprises a first capacitor, a rectifying bridge,

the first connecting end of the rectifier bridge is connected with a secondary power ground, the second connecting end of the rectifier bridge is connected with the first output end of the rectifier bridge through a first capacitor, the third connecting end of the rectifier bridge outputs a second power, and the fourth connecting end of the rectifier bridge is connected with the regulating circuit.

Optionally, the adjusting circuit includes a main control chip and a first relay, and the first relay is connected to the rectifying circuit, the second output end, and the third output end;

the main control chip is provided with a detection end and a control end, the detection end is connected with the fourth connecting end of the rectifier bridge, the control end is connected with the first relay, and the first relay is driven to connect the rectifier circuit with the second output end or the third output end.

Optionally, the first relay is provided with a first end, a second end, a third end, a fourth end and a fifth end, the first end is connected to a secondary power ground, the second end is connected to the rectifying circuit, the third end is connected to the third output end, the fourth end is connected to the fourth output end, and the fifth end is connected to the control end.

Optionally, the second connection end of the rectifier bridge is further connected to a voltage conversion circuit, so that direct current of the second power supply is converted into alternating current.

Optionally, the voltage conversion circuit includes an MOS driver chip, a third MOS transistor, a fourth MOS transistor, a fifth MOS transistor, and a sixth MOS transistor;

and the grid electrode of the third MOS tube, the grid electrode of the fourth MOS tube, the grid electrode of the fifth MOS tube and the grid electrode of the sixth MOS tube are respectively connected with a third driving signal end, a fourth driving signal end, a fifth driving signal end and a sixth driving signal end of the MOS driving chip.

The drain electrode of the third MOS tube is connected with a second power supply, and the source electrode of the third MOS tube is connected with the drain electrode of the fourth MOS tube; the source of the fourth MOS tube is connected with a secondary side power ground;

the drain of the fifth MOS transistor is connected with a second power supply, and the source of the fifth MOS transistor is connected with the drain of the sixth MOS transistor; and the source of the sixth MOS tube is connected with a secondary side power ground.

The application discloses self-adaptation adjusting circuit of push-pull boost circuit transformer, its beneficial effect lies in:

(1) this application is under the prerequisite of guaranteeing other functional integrality, through changing the push-pull boost circuit among the prior art, can realize being suitable for the wide range of input voltage, thereby reaches the function that the dynamic adjustment number of turns is in normal range to control secondary output voltage, makes the security of dc-to-ac converter promote greatly.

(2) The software control algorithm of this application becomes simple, and the closed-loop control that the push-pull was boosted changes open-loop control into, and need not increase too many judgement conditions, only needs to gather second power BUS + voltage value through main control chip's inspection end, can output signal control relay whether need switch over the contact.

(3) The cost of the electromagnetic relay increased by the application is far lower than that of a large inductor, and in addition, the electromagnetic relay further has the characteristics of low power consumption, high reliability of a hardware analog circuit, simplicity in software control and high response speed by setting the relay.

Drawings

Fig. 1 is a circuit block diagram of an embodiment of the present application.

Fig. 2 is a schematic circuit diagram according to an embodiment of the present application.

Fig. 3 is a schematic diagram of a voltage conversion circuit according to an embodiment of the present application.

Detailed Description

The following detailed description of the preferred embodiments of the present application, taken in conjunction with the accompanying drawings, will make the advantages and features of the present application more readily appreciated by those skilled in the art, and thus will more clearly define the scope of the invention.

The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", and the like, if any, are used in the orientations and positional relationships indicated in the drawings only for the convenience of describing the present application and for simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore the terms describing the positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

Furthermore, if the terms "first," "second," and the like are used for descriptive purposes only, they are used for mainly distinguishing different devices, elements or components (the specific types and configurations may be the same or different), and they are not used for indicating or implying relative importance or quantity among the devices, elements or components, but are not to be construed as indicating or implying relative importance.

In the case of the example 1, the following examples are given,

in the embodiment shown in fig. 1-3, the present application provides a push-pull boost circuit transformer adaptive adjustment circuit, which includes a transformer T1, apower supply circuit 1, aswitch circuit 2, arectification circuit 3, and anadjustment circuit 4; a primary winding of the transformer T1 is respectively connected with thepower circuit 1 and theswitch circuit 2, and thepower circuit 1 is connected with theswitch circuit 2; the secondary winding of the transformer T1 is connected with the rectifyingcircuit 3 and the regulatingcircuit 4, and the rectifyingcircuit 3 is electrically connected with the regulator; the first power supply BAT + input by thepower supply circuit 1 is boosted by the transformer T1, rectified by the rectifyingcircuit 3 and then output to the second power supply BUS +. In the embodiment, the number of turns connected to the secondary winding is adjusted by arranging the adjustingcircuit 4 on the secondary winding of the transformer T1; meanwhile, the on-off of theswitch circuit 2 is controlled; the push-pull boost circuit can realize self-adaptive adjustment. This application is under the prerequisite of guaranteeing other functional integrality, through changing the push-pull boost circuit among the prior art, can realize being suitable for the wide range of input voltage, thereby reaches the function that the dynamic adjustment number of turns is in normal range to control secondary output voltage, makes the security of dc-to-ac converter promote greatly. The software control algorithm of this application becomes simple, and the closed-loop control that the push-pull was boosted changes open-loop control into, and need not increase too many judgement conditions, only needs to gather second power BUS + voltage value through main control chip's inspection end, can output signal control relay whether need switch over the contact. The cost of the electromagnetic relay increased by the application is far lower than that of a large inductor, and in addition, the electromagnetic relay further has the characteristics of low power consumption, high reliability of a hardware analog circuit, simplicity in software control and high response speed by setting the relay.

In the case of the example 2, the following examples are given,

the primary winding of the transformer T1 is provided with a first input end T1_1, a second input end T1_2 and a thirdinput end T1_ 3; the positive end of thepower circuit 1 is connected with the first input end, and the negative end of thepower circuit 1 is connected with theswitch circuit 2; theswitch circuit 2 is connected with the first input end, and the third input end is connected with the primary power ground. In this embodiment, the first input terminal and the third input terminal are located at the head end and the tail end of the primary winding, and the second input terminal is located between the head end and the tail end of the primary winding. The positive terminal of thepower circuit 1 is connected with the second input terminal, and theswitch circuit 2 is connected with the first input terminal and the third input terminal.

In the case of the example 3, the following examples are given,

thepower supply circuit 1 comprises at least one energy storage battery. In this embodiment, thepower circuit 1 of the present application may be composed of four energy storage batteries; the voltage of the battery cell monomer can be 3V-4.2V, and the total voltage of the battery end can be 12V-16.8V. The positive terminal of thepower supply circuit 1 outputs a first power supply BAT + to the transformer T1.

In the case of the example 4, the following examples are given,

theswitch circuit 2 comprises a switch chip, a first MOS tube Q1 and a second MOS tube Q2, wherein the switch chip is provided with a first driving signal end and a second driving signal end; the grid electrode of the first MOS transistor Q1 is connected with a first driving signal end, the drain electrode is connected with a first input end, and the source electrode is connected with the cathode end of thepower circuit 1 and the source electrode of the second MOS transistor Q2; the gate of the second MOS transistor Q2 is connected to the second driving signal terminal, and the drain is connected to the primary power ground. In this embodiment, the positive terminal of the power supply outputs the first power supply BAT +, and the first power supply BAT + is connected to the push-pull MOS transistor: in the first MOS transistor Q1 and the second MOS transistor Q2, the voltage is boosted by the transformer T1 and rectified by therectifier circuit 3, and a second power BUS + for the BUS voltage is obtained. In addition, the voltage of the second power supply BUS + is greater than the voltage of the first power supply BAT +. In the prior art, the duty ratio of a first driving signal end connected to the gate of the first MOS transistor Q1 and a second driving signal end connected to the gate of the second MOS transistor Q2 is continuously adjusted in a closed loop; the filtering is required to be continuously carried out through a large inductor; in this embodiment, the first driving signal terminal and the second driving signal terminal of the present application may be set with fixed values for control, so that the first MOS transistor Q1 and the second MOS transistor Q2 perform on-off control according to the fixed values. And the circuit can reduce inductance by matching with the regulatingcircuit 4, so that push-pull boosting is realized. The switch chip can be a chip with the model of a signal channel XL 3525.

In the case of the example 5, the following examples were conducted,

the secondary winding of the transformer T1 is provided with a first output end T1_4, a second output end T1_5 and a third output end T1_ 6; therectifying circuit 3 is connected with the first output end, and therectifying circuit 3 is connected with the second output end or the third output end through the regulatingcircuit 4. In this embodiment, the first output end and the third output end of the present application are located at the head end and the tail end of the secondary winding, and the second output end is located between the head end and the tail end of the primary winding. The sorting circuit is connected with the first output end, and the regulatingcircuit 4 is connected with the second output end and the third output end.

In the case of the example 6, it is shown,

therectifying circuit 3 comprises a first capacitor C and a rectifying bridge BD1, a first connection end BD1_1 of the rectifying bridge BD1 is connected with a secondary power ground, a second connection end BD1_2 is connected with a first output end through the first capacitor, a third connection end BD1_3 is connected with a second power BUS +, and a fourth connection end BD1_4 is connected with the regulatingcircuit 4. In this embodiment, the voltage output from the secondary winding of the transformer T1 is filtered by the first capacitor C and rectified by the rectifier bridge BD1 to output a stable second power BUS +.

In the case of the example 7, the following examples are given,

the regulatingcircuit 4 comprises a main control chip and a first relay K1, and the first relay K1 is connected with the rectifyingcircuit 3, the second output end and the third output end; the main control chip is provided with a detection end and a control end RELAY, the detection end is connected with a fourth connecting end of the rectifier bridge BD1, the control end RELAY is connected with the first RELAY K1, and the first RELAY K1 is driven to connect therectifier circuit 3 with the second output end or the third output end. The first RELAY K1 is provided with a first end K1_1, a second end K1_2, a third end K1_3, a fourth end K1_4 and a fifth end K1_5, the first end is connected with a secondary power ground, the second end is connected with the rectifyingcircuit 3, the third end is connected with a third output end, the fourth end is connected with a fourth output end, and the fifth end is connected with the control end RELAY. In this embodiment, the third connection end of the rectifier bridge BD1 is connected to the second end, and the second output end and the third output end of the transformer T1 are respectively connected to the third end and the fourth end; the first relay K1 controls the connection between the second terminal and the third terminal or between the second terminal and the fourth terminal by receiving the signal of the main control chip. The main control chip is further provided with a detection end, wherein the detection end is connected with the second power supply BUS + and used for obtaining the voltage change of the second power supply BUS +, and therefore the first relay K1 is controlled to be conducted. Specifically, the initial position of the contact of the first relay K1 is that the second end and the fourth end are connected, the number of turns of the winding is small at the moment, and whether the contact needs to be switched is judged by collecting the voltage of the second power supply BUS + after the power is on. When the battery terminal voltage BAT + is at a higher voltage, the first relay K1K1 contact is connected to the second end and the fourth end in a default mode, the number of turns of the secondary winding is relatively small, namely the ratio of the number of turns of the secondary winding to the number of turns of the primary winding is low, the voltage of BUS + is adopted for judgment, the relay contact is not switched at the moment, and the voltage of BUS + cannot be raised too high and is in a proper voltage range. When the battery terminal voltage BAT + discharges to voltage lower, gather the voltage of second power BUS + and judge, find BUS + low voltage, through MCU output signal, through control end RELAY to the fifth end output main control chip of first RELAY K1, make acquiescent second end, fourth end contact connection switch into the second end, third end contact connection, transformer T1 secondary winding number of turns increase this moment, be equivalent to the ratio grow of secondary and primary winding number of turns, the second power BUS + voltage that will originally reduce this moment lifts, rise to suitable voltage range. The master control chip can be a chip with the model of megainnovative GD32F303RCT 6. The first relay may be a relay of model number thirty-friend SJE-SH-112 DH. In addition, the relay can be replaced by circuit components such as a dial switch, a three-section switch, a switch chip and the like.

In the case of the example 8, the following examples are given,

the second connection end of the rectifier bridge BD1 is further connected to avoltage conversion circuit 5, which converts the direct current of the second power supply BUS + into alternating current. Thevoltage conversion circuit 5 comprises a MOS drive chip, a third MOS tube Q3, a fourth MOS tube Q4, a fifth MOS tube Q5 and a sixth MOS tube Q6; the gate of the third MOS transistor Q3, the gate of the fourth MOS transistor Q4, the gate of the fifth MOS transistor Q5, and the gate of the sixth MOS transistor Q6 are respectively connected to the third driving signal terminal, the fourth driving signal terminal, the fifth driving signal terminal, and the sixth driving signal terminal of the MOS driving chip. The drain of the third MOS tube Q3 is connected with the second power supply BUS +, and the source is connected with the drain of the fourth MOS tube Q4; the source of the fourth MOS tube Q4 is connected with the secondary side power ground; the drain of the fifth MOS tube Q5 is connected with the second power supply BUS +, and the source is connected with the drain of the sixth MOS tube Q6; the source of the sixth MOS transistor Q6 is connected to the secondary power ground. In this embodiment, the present application is further provided with a voltage conversion circuit. The second power BUS + output from the secondary winding of the transformer T1 and therectifier circuit 3 is a dc power supply. In this embodiment, a dc-to-ac circuit may be formed by the third MOS transistor Q3, the fourth MOS transistor Q4, the fifth MOS transistor Q5, and the sixth MOS transistor Q6, wherein the gate of the third MOS transistor Q3, the gate of the fourth MOS transistor Q4, the gate of the fifth MOS transistor Q5, and the gate of the sixth MOS transistor Q6 may be controlled by a MOS driver chip; alternatively, the gate of the third MOS transistor Q3, the gate of the fourth MOS transistor Q4, the gate of the fifth MOS transistor Q5, and the gate of the sixth MOS transistor Q6 may be controlled by other logic chips. The direct current of the second power supply BUS + is converted into alternating current by respectively controlling the on-off of the third MOS tube Q3, the fourth MOS tube Q4, the fifth MOS tube Q5 and the sixth MOS tube Q6. Thepower supply circuit 1 can be switched to 380V direct current by the switchingcircuit 2, the transformer T1, the rectifyingcircuit 3, the regulatingcircuit 4 and the voltage conversion circuit, wherein 12V-16.8V in thepower supply circuit 1 can be converted to 380V direct current by the transformer and the rectifying circuit; and then the alternating current is converted into 220V alternating current by the voltage conversion circuit to be output. The MOS driving chip can be a high-performance micro EG2106 chip.

In the case of the example 9, the following examples are given,

the positive terminal of power supply electricity exports first power BAT +, and first power BAT + is connected to push-pull MOS pipe: in the first MOS transistor Q1 and the second MOS transistor Q2, the voltage is boosted by the transformer T1 and rectified by therectifier circuit 3, and a second power BUS + for the BUS voltage is obtained. In addition, the voltage of the second power supply BUS + is greater than the voltage of the first power supply BAT +. The ratio of the voltage of the second power supply BUS + to the voltage of the first power supply BAT + is the ratio of the number of turns of the secondary winding to the number of turns of the primary winding of the transformer T1. The first driving signal end and the second driving signal end can be set with fixed values to control, and the first MOS tube Q1 and the second MOS tube Q2 are controlled to be switched on and off according to the fixed values. And an electromagnetic relay K1 is added to be matched with the application, so that the self-adaptive adjusting circuit becomes a push-pull boosting transformer T1.

First relay K1 contact initial position is second end, fourth end connection, and the winding turn is less this moment, and whether need switch the contact through gathering second power BUS + voltage judgement after the circular telegram. When the voltage BAT + of the battery terminal is higher, the first relay K1 contact is connected to the second end and the fourth end in a default mode, the number of turns of the secondary winding is relatively small, namely the ratio of the number of turns of the secondary winding to the number of turns of the primary winding is low, the voltage of BUS + is adopted for judgment, the relay contact is not switched at the moment, the voltage of BUS + cannot be excessively increased, and the relay contact is in a proper voltage range. When the battery terminal voltage BAT + discharges to voltage lower, gather the voltage of second power BUS + and judge, find BUS + low voltage, through MCU output signal, through control end RELAY to the fifth end output main control chip of first RELAY K1, make acquiescent second end, fourth end contact connection switch into the second end, third end contact connection, transformer T1 secondary winding number of turns increase this moment, be equivalent to the ratio grow of secondary and primary winding number of turns, the second power BUS + voltage that will originally reduce this moment lifts, rise to suitable voltage range. In addition, the voltage of the primary power ground and the secondary power ground of the transformer isolation device can be different.

This application is under the prerequisite of guaranteeing other functional integrality, through changing the push-pull boost circuit among the prior art, can realize being suitable for the wide range of input voltage, thereby reaches the function that the dynamic adjustment number of turns is in normal range to control secondary output voltage, makes the security of dc-to-ac converter promote greatly. The software control algorithm of this application becomes simple, and the closed-loop control that the push-pull was boosted changes open-loop control into, and need not increase too many judgement conditions, only needs to gather second power BUS + voltage value through main control chip's inspection end, can output signal control relay whether need switch over the contact. The cost of the electromagnetic relay increased by the application is far lower than that of a large inductor, and in addition, the electromagnetic relay further has the characteristics of low power consumption, high reliability of a hardware analog circuit, simplicity in software control and high response speed by setting the relay.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present application within the knowledge of those skilled in the art.

Claims (10)

1. A self-adaptive regulating circuit of a push-pull booster circuit transformer is characterized by comprising a transformer, a power circuit, a switching circuit, a rectifying circuit and a regulating circuit;

the primary winding of the transformer is respectively connected with a power circuit and a switch circuit, and the power circuit is connected with the switch circuit; the secondary winding of the transformer is connected with a rectifying circuit and a regulating circuit, and the rectifying circuit is electrically connected with the regulating circuit;

the first power supply input by the power supply circuit outputs a second power supply after being boosted by the transformer and rectified by the rectifying circuit.

2. The self-adaptive adjustment circuit of the push-pull boost circuit transformer of claim 1, characterized in that a primary winding of the transformer is provided with a first input terminal, a second input terminal, and a third input terminal; the positive end of the power circuit is connected with the first input end, and the negative end of the power circuit is connected with the switch circuit; the switch circuit is connected with the first input end, and the third input end is connected with a primary power ground.

3. The push-pull boost circuit transformer adaptation adjustment circuit of claim 2, wherein the power supply circuit comprises at least one energy storage battery.

4. The self-adaptive adjusting circuit of the push-pull booster circuit transformer of claim 2, wherein the switch circuit comprises a switch chip, a first MOS transistor and a second MOS transistor, and the switch chip is provided with a first driving signal end and a second driving signal end;

the grid electrode of the first MOS tube is connected with a first driving signal end, the drain electrode of the first MOS tube is connected with the first input end, and the source electrode of the first MOS tube is connected with the cathode end of the power circuit and the source electrode of the second MOS tube;

and the grid electrode of the second MOS tube is connected with a second driving signal end, and the drain electrode of the second MOS tube is connected with a primary side power ground.

5. The adaptive adjustment circuit for the transformer of the push-pull boost circuit according to claim 4, wherein the secondary winding of the transformer is provided with a first output terminal, a second output terminal and a third output terminal;

the rectifying circuit is connected with the first output end and is connected with the second output end or the third output end through the regulating circuit.

6. The adaptive adjustment circuit for the transformer of the push-pull boost circuit according to claim 5, wherein said rectification circuit comprises a first capacitor and a rectification bridge,

the first connecting end of the rectifier bridge is connected with a secondary power ground, the second connecting end of the rectifier bridge is connected with the first output end of the rectifier bridge through a first capacitor, the third connecting end of the rectifier bridge outputs a second power, and the fourth connecting end of the rectifier bridge is connected with the regulating circuit.

7. The self-adaptive adjusting circuit of the push-pull booster circuit transformer of claim 6, wherein the adjusting circuit comprises a main control chip and a first relay, and the first relay is connected with the rectifying circuit, the second output end and the third output end;

the main control chip is provided with a detection end and a control end, the detection end is connected with the fourth connecting end of the rectifier bridge, the control end is connected with the first relay, and the first relay is driven to connect the rectifier circuit with the second output end or the third output end.

8. The adaptive adjustment circuit for the transformer of the push-pull boost circuit according to claim 7, wherein the first relay is provided with a first terminal, a second terminal, a third terminal, a fourth terminal and a fifth terminal, the first terminal is connected to a secondary power ground, the second terminal is connected to the rectification circuit, the third terminal is connected to the third output terminal, the fourth terminal is connected to the fourth output terminal, and the fifth terminal is connected to the control terminal.

9. The self-adaptive adjusting circuit of the push-pull boosting circuit transformer according to claim 6, wherein the second connection end of the rectifier bridge is further connected with a voltage conversion circuit for converting the direct current of the second power supply into alternating current.

10. The self-adaptive adjusting circuit of the push-pull booster circuit transformer of claim 9, wherein the voltage conversion circuit comprises an MOS driver chip, a third MOS transistor, a fourth MOS transistor, a fifth MOS transistor, and a sixth MOS transistor;

the grid electrode of the third MOS tube, the grid electrode of the fourth MOS tube, the grid electrode of the fifth MOS tube and the grid electrode of the sixth MOS tube are respectively connected with a third driving signal end, a fourth driving signal end, a fifth driving signal end and a sixth driving signal end of the MOS driving chip;

the drain electrode of the third MOS tube is connected with a second power supply, and the source electrode of the third MOS tube is connected with the drain electrode of the fourth MOS tube; the source of the fourth MOS tube is connected with a secondary side power ground;

the drain electrode of the fifth MOS tube is connected with the second power supply, and the source electrode of the fifth MOS tube is connected with the drain electrode of the sixth MOS tube; and the source of the sixth MOS tube is connected with a secondary side power ground.

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