High-frequency rectification power supply based on single-stage circuit

Abstract

The utility model provides a high-frequency rectification power supply based on a single-stage circuit. The high-frequency rectification power supply based on the single-stage circuit comprises a soft start circuit, a rectifier bridge and a double-active-bridge inverter which are connected in sequence, the soft start circuit comprises a contactor, a thyristor, a first voltage sensor, an absolute value detection circuit and a comparison circuit, and a normally open contact of the contactor is connected with the thyristor in parallel. The two ends of the thyristor are connected with the input end of the first voltage sensor, the control end of the thyristor is connected with the first signal output end of the controller, the output end of the first voltage sensor is connected with the input end of the absolute value detection circuit, and the output end of the absolute value detection circuit is connected into the first input end of the comparison circuit. The second input end of the comparison circuit is connected with the first reference voltage, and the output end of the comparison circuit is used for controlling on-off of the contactor. The problem that an existing rectification power supply circuit is complex in structure and inconvenient to maintain can be solved.

Description

Technical Field

[0001] This disclosure relates to the field of power supply technology, and in particular to a high-frequency rectified power supply based on a single-stage circuit. Background Technology

[0002] As rectifier power supply technology has matured, rectifier power supplies have begun to be used in various high-power demand scenarios. Most current high-frequency rectifier power supplies are two-stage rectifier circuits. Although this reduces current ripple to some extent, it also increases the number of components used. When problems occur in the rectifier circuit, it is not easy to analyze the cause of the damage, which increases the difficulty of repair. Utility Model Content

[0003] This disclosure provides a high-frequency rectified power supply based on a single-stage circuit to solve the problems of complex circuit structure and inconvenient maintenance of existing rectified power supplies.

[0004] This disclosure provides a high-frequency rectified power supply based on a single-stage circuit, comprising a soft-start circuit, a rectifier bridge, and a dual active bridge inverter connected in sequence.

[0005] One end of the soft-start circuit is used to connect to the AC power supply, and the output end of the dual active bridge inverter is used to connect to the load.

[0006] The soft-start circuit includes a contactor, a thyristor, a first voltage sensor, an absolute value detection circuit, and a comparator circuit. The normally open contact of the contactor is connected in parallel with the thyristor. The two ends of the thyristor are connected to the input terminal of the first voltage sensor. The control terminal of the thyristor is connected to the first signal output terminal of the controller.

[0007] The output terminal of the first voltage sensor is connected to the input terminal of the absolute value detection circuit. The output terminal of the absolute value detection circuit is connected to the first input terminal of the comparison circuit. The second input terminal of the comparison circuit is connected to the first reference voltage. The output terminal of the comparison circuit is used to control the on / off state of the contactor.

[0008] In one exemplary embodiment of this disclosure, the high-frequency rectified power supply based on a single-stage circuit further includes a switching transistor Q9. The control terminal of the switching transistor Q9 is connected to the output terminal of the comparator circuit. The first terminal of the switching transistor Q9 is connected to the first terminal of the contactor coil. The second terminal of the contactor coil is connected to a first power supply. The second terminal of the switching transistor Q9 is grounded.

[0009] In one exemplary embodiment of this disclosure, an AND gate U3 is provided between the output terminal of the comparator circuit and the control terminal of the switching transistor Q9.

[0010] The first input terminal of AND gate U3 is connected to the output terminal of the comparator circuit, the second input terminal of AND gate U3 is connected to the second signal output terminal of the controller, and the output terminal of AND gate U3 is connected to the control terminal of the switch Q9.

[0011] In one exemplary embodiment of this disclosure, a first amplification circuit is provided between the output terminal of the first voltage sensor and the absolute value detection circuit.

[0012] In one exemplary embodiment of this disclosure, the absolute value detection circuit includes operational amplifier U1B, operational amplifier U1C, resistor R6, resistor R7, and diode D8.

[0013] The first end of resistor R6 is connected to the output terminal of the first amplifier circuit, which is the inverting input terminal of operational amplifier U1B. The non-inverting input terminal of operational amplifier U1B is grounded. The output terminal of operational amplifier U1B is connected to the anode of diode D8. The cathode of diode D8 is fed back to the inverting input terminal of operational amplifier U1B through resistor R7.

[0014] The non-inverting input terminal of the operational amplifier U1 is connected to the cathode of the diode D8, the output terminal of the operational amplifier U1C is fed back to the inverting input terminal of the operational amplifier U1C, and the output terminal of the operational amplifier U1C is the output terminal of the absolute value detection circuit.

[0015] In one exemplary embodiment of this disclosure, the high-frequency rectified power supply based on a single-stage circuit further includes resistors R8 and R9.

[0016] The first end of the resistor R9 is connected to the first power supply, and the second end of the resistor R9 is grounded through the resistor R8. The second end of the resistor R9 is the first reference voltage.

[0017] In one exemplary embodiment of this disclosure, the dual active bridge inverter is sequentially connected to a DC-AC circuit, a transformer, and an AC-DC circuit. The input terminal of the DC-AC circuit is the input terminal of the dual active bridge inverter, and the output terminal of the AC-DC circuit is the output terminal of the dual active bridge inverter.

[0018] The high-frequency rectified power supply based on a single-stage circuit also includes a transformer turns ratio detection circuit, which comprises a second voltage sensor, a second amplification circuit, a third voltage sensor, a third amplification circuit, and a subtraction circuit.

[0019] The second voltage sensor is used to detect the voltage on the primary side of the transformer, and the output terminal of the second voltage sensor is connected to the first input terminal of the subtraction circuit through the second amplification circuit.

[0020] The third voltage sensor is used to detect the voltage on the secondary side of the transformer. The output of the third voltage sensor is connected to the second input of the subtraction circuit through the third amplification circuit. The output of the subtraction circuit is connected to the first signal input of the controller.

[0021] The high-frequency rectified power supply based on a single-stage circuit provided in this disclosure has the following working principle and beneficial effects:

[0022] In this embodiment, the AC power supply is rectified by the rectifier bridge and then converted by the dual active bridge inverter (DAB converter). In other words, the input three-phase AC power is converted from AC to DC through one main conversion process. The circuit structure is simple and easy to maintain.

[0023] The DAB converter includes a DC-AC circuit, a transformer, and an AC-DC circuit connected in sequence. Considering that when the DAB converter is started under full load, a very large primary or secondary transformer current will be generated during the establishment of the secondary output voltage of the transformer, which will affect the reliability of the start-up. The problem is more serious when the input voltage is higher, the load power is greater, or the capacitive load is started.

[0024] To address the aforementioned issues, this embodiment of the present disclosure incorporates a soft-start circuit. A thyristor is connected in parallel across the normally open contact of the contactor, and a first voltage sensor detects the voltage across the thyristor. Upon startup, the controller gradually increases the conduction angle of the thyristor, causing the voltage across the thyristor to decrease continuously, while the current on the primary and secondary sides of the transformer gradually increases. When the voltage across the thyristor decreases to a set value, the output voltage of the first voltage sensor becomes less than a first reference voltage. The comparator circuit then outputs a high-level signal, controlling the contactor to conduct, thus achieving a smooth start-up of the rectified power supply.

[0025] Therefore, this embodiment realizes the power conversion of the rectifier power supply based on a single-stage circuit. The circuit structure is simple and easy to maintain. At the same time, the setting of the soft-start circuit further realizes the smooth start of the rectifier power supply and improves the stability of the rectifier power supply. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a high-frequency rectified power supply based on a single-stage circuit provided in an embodiment of this disclosure;

[0028] Figure 2 This is a schematic diagram of a transformer turns ratio detection circuit provided in an embodiment of this disclosure. Detailed Implementation

[0029] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.

[0030] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.

[0031] The implementation of this disclosure will be described in detail below with reference to the specific accompanying drawings:

[0032] Figure 1 A schematic diagram of a high-frequency rectified power supply based on a single-stage circuit is provided for embodiments of this disclosure. (Refer to...) Figure 1 This high-frequency rectified power supply based on a single-stage circuit includes a soft-start circuit, a rectifier bridge, and a dual active bridge inverter connected in sequence.

[0033] One end of the soft-start circuit is used to connect to the AC power supply, and the output of the dual active bridge inverter is used to connect to the load.

[0034] The soft-start circuit includes a contactor, a thyristor, a first voltage sensor, an absolute value detection circuit, and a comparator circuit. The normally open contact of the contactor is connected in parallel with the thyristor. The two ends of the thyristor are connected to the input terminal of the first voltage sensor, and the control terminal of the thyristor is connected to the first signal output terminal of the controller.

[0035] The output of the first voltage sensor is connected to the input of the absolute value detection circuit. The output of the absolute value detection circuit is connected to the first input of the comparison circuit. The second input of the comparison circuit is connected to the first reference voltage. The output of the comparison circuit is used to control the on / off state of the contactor.

[0036] In this embodiment, the AC power is rectified by the rectifier bridge and then converted by the dual active bridge inverter (DAB converter). In other words, the input three-phase AC power undergoes a major conversion process to complete the conversion from AC to DC. The circuit structure is simple and easy to maintain.

[0037] The DAB converter includes a DC-AC circuit, a transformer, and an AC-DC circuit connected in sequence. When the output phase angle lags behind the input phase angle, energy flows from the AC power supply side through rectification, DAB, and other stages. During this process, electrical energy flows normally from the input end to the output end, providing energy to the load and enabling the load to operate normally. This process is called the forward transmission process. When the input phase angle lags behind the output phase angle, the energy transmission direction is opposite to that of the forward transmission, that is, it is transmitted from the original output end to the input end. This process is called the reverse transmission process. For example, in some energy storage systems, when it is necessary to feed excess electrical energy from the load side back to the power supply side for storage, the reverse transmission situation will occur.

[0038] Considering that when a DAB converter starts under full load, a very large primary or secondary transformer current will be generated during the establishment of the secondary output voltage, which affects the reliability of startup. The problem is more serious when the input voltage is higher, the load power is greater, or the capacitive load is started.

[0039] To address the aforementioned issues, this embodiment incorporates a soft-start circuit. Thyristors (SCR1 / SCR2 / SCR3) are connected in parallel across the normally open contact of contactor KM1. A first voltage sensor detects the voltage across the thyristors. Upon startup, the controller gradually increases the conduction angle of the thyristors, causing the voltage across them to decrease and the current on both the primary and secondary sides of the transformer to gradually increase. When the voltage across the thyristors decreases to a set value, the output voltage of the absolute value detection circuit is less than the first reference voltage. The comparator circuit then outputs a high-level signal, controlling contactor KM1 to conduct, thus achieving a smooth start-up of the rectified power supply. The first voltage sensor is connected to the circuit via terminal J1, the comparator circuit is implemented using comparator U2, and the controller can be implemented using commonly available microcontrollers such as single-chip microcomputers, DSPs, and ARM processors.

[0040] As can be seen from the above, this embodiment realizes the power conversion of the rectifier power supply based on a single-stage circuit. The circuit structure is simple and easy to maintain. At the same time, the setting of the soft-start circuit further realizes the smooth start-up of the rectifier power supply and improves the stability of the rectifier power supply.

[0041] Reference Figure 1 In one exemplary embodiment of this disclosure, the high-frequency rectified power supply based on a single-stage circuit further includes a switching transistor Q9. The control terminal of the switching transistor Q9 is connected to the output terminal of the comparator circuit. The first terminal of the switching transistor Q9 is connected to the first terminal of the contactor coil. The second terminal of the contactor coil is connected to the first power supply. The second terminal of the switching transistor Q9 is grounded.

[0042] In this embodiment, when the comparator circuit outputs a high level, the switch Q9 is turned on, the coil of contactor KM1 is energized, and the normally open contact of contactor KM1 is closed; when the comparator circuit outputs a low level, the switch Q9 is turned off, the coil of contactor KM1 is de-energized, and the normally open contact of contactor KM1 is closed.

[0043] Therefore, the comparator circuit can control the on / off state of contactor KM1 by outputting different level signals.

[0044] Reference Figure 1 In one exemplary embodiment of this disclosure, an AND gate U3 is provided between the output terminal of the comparator circuit and the control terminal of the switching transistor Q9.

[0045] The first input terminal of AND gate U3 is connected to the output terminal of the comparator circuit, the second input terminal of AND gate U3 is connected to the second signal output terminal of the controller, and the output terminal of AND gate U3 is connected to the control terminal of the switching transistor Q9.

[0046] In this embodiment, upon startup, the controller's first signal output terminal outputs a control signal to the thyristor, and the thyristor's conduction angle continuously increases; the controller's second signal output terminal outputs a high-level control signal to the second input terminal of AND gate U3. When the thyristor's conduction voltage drop is large, the voltage across the thyristor is greater than the first reference voltage. The comparator circuit outputs a low-level signal to the first input terminal of AND gate U3, and AND gate U3 outputs a low-level signal, the switch Q9 is turned off, and the contactor KM1 does not operate.

[0047] As the thyristor conduction angle increases, the thyristor conduction voltage drop decreases. When the voltage across the thyristor is less than the first reference voltage, the comparator circuit outputs a high-level signal to the first input of AND gate U3. AND gate U3 outputs a high-level signal, switch Q9 turns on, contactor KM1 turns on, and soft start is completed.

[0048] During normal operation, if it is necessary to turn off contactor KM1, a low-level signal can be output from the second signal output terminal of the controller to the second input terminal of AND gate U3. When AND gate U3 outputs a low-level signal, switch Q9 is turned off, and contactor KM1 is turned off.

[0049] As can be seen from the above, the setting of AND gate U3 in this embodiment realizes the linkage control of contactor KM1, making the conduction and cut-off of contactor KM1 more in line with actual needs.

[0050] Reference Figure 1 In one exemplary embodiment of this disclosure, a first amplification circuit is provided between the output terminal of the first voltage sensor and the absolute value detection circuit.

[0051] In this embodiment, considering that the output signal of the first voltage sensor is relatively weak, by setting a first amplification circuit at the output terminal of the first voltage sensor, the output signal of the first voltage sensor can be amplified to a set level, which is convenient for comparison with the first reference voltage.

[0052] The first amplifier circuit can be implemented by an inverting proportional amplifier circuit consisting of operational amplifier U1A and resistors R2 and R3.

[0053] In one exemplary embodiment of this disclosure, the absolute value detection circuit includes operational amplifier U1B, operational amplifier U1C, resistor R6, resistor R7, and diode D8.

[0054] The first terminal of resistor R6 is connected to the output terminal of the first amplifier circuit of the inverting input terminal of operational amplifier U1B. The non-inverting input terminal of operational amplifier U1B is grounded. The output terminal of operational amplifier U1B is connected to the anode of diode D8. The cathode of diode D8 is fed back to the inverting input terminal of operational amplifier U1B through resistor R7.

[0055] The non-inverting input of operational amplifier U1 is connected to the cathode of diode D8. The output of operational amplifier U1C is fed back to the inverting input of operational amplifier U1C. The output of operational amplifier U1C is the output of the absolute value detection circuit.

[0056] In this embodiment, when the voltage across the thyristor is greater than zero, the output voltage (denoted as uc) of the first amplifier circuit is greater than zero, the voltage at the inverting input of operational amplifier U1B is positive, the voltage at the output is negative, the diode D8 is cut off, and the output voltage of the first amplifier circuit is connected to the non-inverting input of operational amplifier U1C via resistors R6 and R7 in sequence. The voltage at the non-inverting input of operational amplifier U1C is equal to uc. Operational amplifier U1C constitutes a voltage follower, therefore, the output voltage of operational amplifier U1C is also equal to uc. That is, when the output voltage uc of the first amplifier circuit is greater than 0, the output voltage of operational amplifier U1C is equal to uc.

[0057] When the voltage across the thyristor is less than zero, the output voltage (denoted as uc) of the first amplifier circuit is less than zero. The voltage at the inverting input of op-amp U1B is negative, and the voltage at the output is positive. Diode D8 is turned on, and op-amp U1B forms an inverting proportional amplifier circuit. If the resistance values ​​of resistors R6 and R7 are set to be equal, then the amplification factor of the inverting proportional amplifier circuit formed by op-amp U1B is -1, that is, the output voltage of op-amp U1B is equal to -uc. The output voltage of op-amp U1B is connected to the non-inverting input of op-amp U1C, and op-amp U1C forms a voltage follower. Therefore, the output voltage of op-amp U1C is also equal to -uc. That is, when the output voltage uc of the first amplifier circuit is less than 0, the output voltage of op-amp U1C is equal to -uc.

[0058] As can be seen from the above, the configuration of operational amplifier U1B, operational amplifier U1C, resistor R6, resistor R7 and diode D8 in this embodiment realizes the function of detecting the absolute value of the voltage across the thyristor.

[0059] Reference Figure 1 In one exemplary embodiment of this disclosure, the high-frequency rectified power supply based on a single-stage circuit further includes resistors R8 and R9.

[0060] The first terminal of resistor R9 is connected to the first power supply, and the second terminal of resistor R9 is grounded through resistor R8. The second terminal of resistor R9 is the first reference voltage.

[0061] In this embodiment, resistors R8 and R9 form a series voltage divider circuit. The voltage across resistor R8 serves as the first reference voltage. By adjusting the resistance values ​​of resistors R8 and R9, the specific value of the first reference voltage can be adjusted.

[0062] Reference Figure 1 In one exemplary embodiment of this disclosure, the dual active bridge inverter is sequentially connected to a DC-AC circuit, a transformer, and an AC-DC circuit. The input terminal of the DC-AC circuit is the input terminal of the dual active bridge inverter, and the output terminal of the AC-DC circuit is the output terminal of the dual active bridge inverter.

[0063] Reference Figure 2 The high-frequency rectified power supply based on a single-stage circuit also includes a transformer turns ratio detection circuit, which comprises a second voltage sensor, a second amplifier circuit, a third voltage sensor, a third amplifier circuit, and a subtraction circuit.

[0064] The second voltage sensor is used to detect the voltage on the primary side of the transformer. The output of the second voltage sensor is connected to the first input of the subtraction circuit through the second amplifier circuit.

[0065] The third voltage sensor is used to detect the voltage on the secondary side of the transformer. The output of the third voltage sensor is connected to the second input of the subtraction circuit through the third amplifier circuit. The output of the subtraction circuit is connected to the first signal input of the controller.

[0066] In this embodiment, it is considered that when the transformer core is saturated, has uneven permeability, or has broken magnetic circuit, it will affect the transmission and induction of the magnetic field, which will lead to abnormal secondary voltage and mismatch with primary voltage. The mismatch between primary and secondary voltage will result in large reactive current, increase reactive power loss, and reduce circuit efficiency.

[0067] To avoid the above problems, this embodiment is equipped with a transformer turns ratio detection circuit, which can monitor the transformer turns ratio in real time. When the transformer turns ratio exceeds the normal range, it indicates that the primary and secondary voltages of the transformer are mismatched. At this time, an alarm message can be output in time to remind the staff to carry out maintenance in time and avoid the circuit efficiency reduction caused by the mismatch between the primary and secondary voltages of the transformer.

[0068] Specifically, the voltage on the primary side of the transformer can be detected by a second voltage sensor and amplified by a second amplifier circuit, and the voltage on the secondary side of the transformer can be detected by a third voltage sensor and amplified by a third amplifier circuit.

[0069] The second amplifier circuit can be an inverting amplifier circuit consisting of operational amplifier U4A, resistor R12, and resistor R13, and the third amplifier circuit can be an inverting amplifier circuit consisting of operational amplifier U4B, resistor R14, and resistor R15.

[0070] Considering that under normal circumstances, the output voltage of the second voltage sensor is k times the output voltage of the third voltage sensor (where k is the transformer turns ratio), if the amplification factor of the third amplifier circuit is set to k times that of the second amplifier circuit, then the output voltage of the second amplifier circuit will be equal to the output voltage of the third amplifier circuit, and the output of the subtraction circuit will be close to zero. Conversely, if the ratio of the output voltage of the second voltage sensor to the output voltage of the third voltage sensor is inconsistent with the transformer turns ratio k (i.e., the primary and secondary voltages of the transformer are mismatched), then the output of the subtraction circuit will not be zero. The greater the degree of mismatch between the primary and secondary voltages of the transformer, the greater the difference between the output of the subtraction circuit and zero. Therefore, the degree of mismatch between the primary and secondary voltages of the transformer can be determined by detecting the output voltage of the subtraction circuit.

[0071] As can be seen from the above, the transformer ratio detection circuit in this embodiment can monitor the transformer ratio in real time, thereby determining the degree of mismatch between the primary and secondary voltages of the transformer and avoiding the reduction in circuit efficiency caused by the mismatch between the primary and secondary voltages of the transformer.

[0072] The above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A high frequency rectifier power supply based on a single stage circuit, characterized by, The soft start circuit, the rectifier bridge and the dual active bridge inverter are connected in sequence, One end of the soft start circuit is used for connecting with an alternating current power supply, and an output end of the dual active bridge inverter is used for connecting with a load, The soft start circuit comprises a contactor, a thyristor, a first voltage sensor, an absolute value detection circuit and a comparison circuit, the normally open contact of the contactor is connected in parallel with the thyristor, two ends of the thyristor are connected with input ends of the first voltage sensor, and a control end of the thyristor is connected with a first signal output end of a controller, An output end of the first voltage sensor is connected with an input end of the absolute value detection circuit, an output end of the absolute value detection circuit is connected to a first input end of the comparison circuit, a second input end of the comparison circuit is connected with a first reference voltage, and an output end of the comparison circuit is used for controlling on-off of the contactor.

2. The high frequency rectifier power supply based on a single stage circuit according to claim 1, characterized in that, A switching tube Q9 is further included, a control end of the switching tube Q9 is connected with the output end of the comparison circuit, a first end of the switching tube Q9 is connected with a first end of a contactor coil, a second end of the contactor coil is connected with a first power supply, and a second end of the switching tube Q9 is grounded.

3. The high frequency rectifier power supply based on a single stage circuit according to claim 2, characterized in that, A NAND gate U3 is arranged between the output end of the comparison circuit and the control end of the switching tube Q9, a first input end of the NAND gate U3 is connected with the output end of the comparison circuit, a second input end of the NAND gate U3 is connected with a second signal output end of the controller, and an output end of the NAND gate U3 is connected with the control end of the switching tube Q9.

4. The high frequency rectifier power supply based on a single stage circuit according to claim 1, characterized in that, A first amplification circuit is arranged between the output end of the first voltage sensor and the absolute value detection circuit.

5. The high frequency rectifier power supply based on a single stage circuit according to claim 4, characterized in that, The absolute value detection circuit comprises an operational amplifier U1B, an operational amplifier U1C, a resistor R6, a resistor R7 and a diode D8, a first end of the resistor R6 is connected with an inverting input end of the operational amplifier U1B and an output end of the first amplification circuit, a non-inverting input end of the operational amplifier U1B is grounded, an output end of the operational amplifier U1B is connected with an anode of the diode D8, and a cathode of the diode D8 is connected to the inverting input end of the operational amplifier U1B through the resistor R7, a non-inverting input end of the operational amplifier U1C is connected with the cathode of the diode D8, and an output end of the operational amplifier U1C is connected to the inverting input end of the operational amplifier U1C in a feedback mode, and the output end of the operational amplifier U1C is the output end of the absolute value detection circuit.

6. The high frequency rectifier power supply based on a single stage circuit according to claim 1, characterized in that, A resistor R8 and a resistor R9 are further included, a first end of the resistor R9 is connected with the first power supply, a second end of the resistor R9 is grounded through the resistor R8, and the second end of the resistor R9 is the first reference voltage.

7. The high frequency rectifier power supply based on a single stage circuit according to claim 1, characterized in that, The dual active bridge inverter comprises a DC-AC circuit, a transformer and an AC-DC circuit connected in sequence, the input end of the DC-AC circuit is the input end of the dual active bridge inverter, and the output end of the AC-DC circuit is the output end of the dual active bridge inverter, The high-frequency rectification power supply based on the single-stage circuit further comprises a transformer ratio detection circuit, the transformer ratio detection circuit comprises a second voltage sensor, a second amplification circuit, a third voltage sensor, a third amplification circuit and a subtraction circuit, The second voltage sensor is used for detecting the voltage of the primary side of the transformer, and the output end of the second voltage sensor is connected to the first input end of the subtraction circuit through the second amplification circuit, The third voltage sensor is used for detecting the voltage of the secondary side of the transformer, and the output end of the third voltage sensor is connected to the second input end of the subtraction circuit through the third amplification circuit, and the output end of the subtraction circuit is connected to the first signal input end of the controller.

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