Intelligent control circuit of variable frequency inverter power supply

Abstract

The application discloses a kind of variable frequency inverter power intelligent control circuit, it is related to variable frequency inverter power technical field, including micro control module, control first energy storage capacitor and second energy storage capacitor in variable frequency control module, when the power module access electric energy in positive half cycle and negative half cycle, energy storage, voltage boost discharge and variable frequency inverter processing are carried out, and power supply module is powered to load module, drive connected load work, micro control module can be when power module detects that the direct current electric energy accessed is less than the voltage threshold set and greater than low voltage threshold, can be during positive and negative half cycle work, by changing the transmission path of electric energy, control first energy storage capacitor and second energy storage capacitor carry out series voltage boost processing.The variable frequency inverter power intelligent control circuit of the application can reduce circuit complexity, maximum degree expands the voltage range that power module can input.

Description

Technical Field

[0001] This invention relates to the field of variable frequency inverter power supply technology, specifically a variable frequency inverter power supply intelligent control circuit. Background Technology

[0002] Variable frequency inverters are important power conversion and frequency regulation devices in the field of power electronics. They are widely used in various industrial fields, such as variable speed drives, material handling, fans, and pump loads. Current variable frequency inverters generally consist of four sets of MOSFETs, and the power conversion and frequency regulation are controlled by a microcontroller through PWM modulation. In order to meet the requirements of low input voltage frequency conversion applications, a cascaded DC-DC converter circuit on the DC side or an auxiliary power supply for voltage compensation is used to improve the boost capability of the variable frequency inverter. However, the cascaded DC-DC converter circuit on the DC side increases the number of conversion stages, increases the circuit complexity, and cannot further expand the input voltage range. The auxiliary power supply for voltage compensation increases the circuit size. Therefore, improvements are needed. Summary of the Invention

[0003] This invention provides an intelligent control circuit for a variable frequency inverter power supply to solve the problems mentioned in the background art.

[0004] According to an embodiment of the present invention, a smart control circuit for a frequency converter is provided, comprising: The power module is used to receive DC power, divide the DC power and output a voltage signal, and compare the voltage signal with the voltage of a set voltage threshold and a low voltage threshold. The frequency conversion control module is connected to the power supply module and the load module. It is used to receive DC power, store and boost discharge through the first energy storage capacitor during the positive half cycle, and store and boost discharge through the second energy storage capacitor during the negative half cycle. It performs frequency conversion processing on the energy released by the first energy storage capacitor and the energy released by the second energy storage capacitor and outputs AC power to supply power to the load module. The self-boosting module is connected to the frequency converter control module and is used to change the connection state of the first energy storage capacitor and the second energy storage capacitor, and control the first energy storage capacitor and the second energy storage capacitor in the frequency converter control module to perform series discharge processing in the positive half cycle and the negative half cycle. The microcontroller module is connected to the power supply module, the frequency converter control module, and the autonomous boost module. It is used to control the first energy storage capacitor to perform energy storage and boost discharge during the positive half-cycle, and to control the second energy storage capacitor to perform energy storage and boost discharge during the negative half-cycle. When the voltage signal is less than the voltage threshold and greater than the low voltage threshold, it controls the autonomous boost module to change the connection state of the first energy storage capacitor and the second energy storage capacitor. The load module is used to filter AC power and drive the load.

[0005] As a further embodiment of the present invention: the power supply module includes a power interface; the frequency conversion control module includes a first inductor, a third diode, a fourth diode, a fourth power transistor, and a first power transistor; the microcontroller module includes a first controller; Preferably, the first end of the power interface is connected to the anode of the third diode and the anode of the fourth diode through the first inductor, the cathode of the third diode is connected to the drain of the fourth power transistor, the cathode of the fourth diode is connected to the drain of the first power transistor, the source of the first power transistor is connected to the source of the fourth power transistor and the second end of the power interface, and the gate of the first power transistor and the gate of the fourth power transistor are respectively connected to the IO3 and IO1 terminals of the first controller.

[0006] As a further embodiment of the present invention: the frequency conversion control module further includes a first capacitor, a fifth thyristor, a second inverter, a second capacitor, a sixth thyristor, a first inverter, a first diode, and a second diode; Preferably, the positive terminal of the first capacitor is connected to the cathode of the fourth diode, the negative terminal of the first capacitor is connected to one end of the fifth thyristor, the other end of the fifth thyristor is connected to the anode of the first diode, the cathode of the first diode is connected to the cathode of the second diode and the second end of the power interface, the anode of the second diode is connected to one end of the sixth thyristor, the other end of the sixth thyristor is connected to the negative terminal of the second capacitor, the positive terminal of the second capacitor is connected to the cathode of the third diode, and the input terminal of the first inverter is connected to the input terminal of the second inverter.

[0007] As a further embodiment of the present invention: the frequency conversion control module further includes a third power transistor, a fifth power transistor, a second power transistor, and a sixth power transistor; the load module includes a second inductor, a fourth capacitor, and a load interface; Preferably, the source of the third power transistor is connected to the anode of the first diode, the drain of the third power transistor is connected to the source of the fifth power transistor and connected to one end of the fourth capacitor and the first end of the load interface through the second inductor, the drain of the fifth power transistor is connected to the drain of the second power transistor and the cathode of the first diode, the source of the second power transistor is connected to the drain of the sixth power transistor, the other end of the fourth capacitor and the second end of the load interface, the source of the sixth power transistor is connected to the anode of the second diode, and the gates of the third power transistor, the fifth power transistor, the second power transistor and the sixth power transistor are respectively connected to the IO3, IO2, IO4 and IO1 terminals of the first controller.

[0008] As a further embodiment of the present invention: the autonomous boost module includes a first thyristor, a fifth diode, and a second thyristor; Preferably, the anode of the first thyristor is connected to the cathode of the third diode, the cathode of the first thyristor is connected to the positive terminal of the second capacitor, the anode of the second thyristor is connected to the anode of the first diode, the cathode of the second thyristor is connected to the negative terminal of the second capacitor, the control terminal of the first thyristor is connected to the anode of the fifth diode, the control terminal of the second thyristor and the IO5 terminal of the first controller, and the cathode of the fifth diode is connected to the input terminal of the second inverter.

[0009] As a further embodiment of the present invention: the autonomous boost module also includes a third thyristor, a fourth thyristor, and a sixth diode; Preferably, the anode of the third thyristor is connected to the positive terminal of the first capacitor, the cathode of the third thyristor is connected to the negative terminal of the second capacitor, the cathode of the fourth thyristor is connected to the negative terminal of the first capacitor, the anode of the fourth thyristor is connected to the anode of the second diode, the control terminal of the fourth thyristor is connected to the control terminal of the third thyristor, the IO6 terminal of the sixth diode and the first controller, and the cathode of the sixth diode is connected to the input terminal of the first inverter.

[0010] As a further embodiment of the present invention: the power module further includes a first resistor, a second resistor, a first comparator, a first reference power supply, a second reference power supply, and a second comparator; Preferably, the inverting input of the first comparator is connected to the first terminal of the first resistor and the non-inverting input of the second comparator, and is connected to the second terminal of the power interface through the second resistor. The second terminal of the first resistor is connected to the first terminal of the power interface. The non-inverting input of the first comparator and the inverting input of the second comparator are respectively connected to the first reference power supply and the second reference power supply. The output terminals of the first comparator and the second comparator are respectively connected to the IO7 and IO8 terminals of the first controller.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: The intelligent control circuit of the variable frequency inverter power supply of the present invention can be controlled by the microcontroller module to perform energy storage, voltage boosting and discharge, and variable frequency inversion processing on the electrical energy connected to the power supply module during the positive and negative half-cycles, and to supply power to the load module to drive the connected load to work. This can reduce circuit complexity and expand the input voltage range of the power supply module. When the power supply module detects that the input DC power is less than the set voltage threshold but greater than the low voltage threshold, the microcontroller module can control the first and second energy storage capacitors to perform series boosting processing by changing the power transmission path during the positive and negative half-cycles, further expanding the input voltage range of the power supply module. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic block diagram of a variable frequency inverter power supply intelligent control circuit provided in an embodiment of the present invention.

[0014] Figure 2 The circuit diagram is provided for an embodiment of the present invention of an intelligent control circuit for a frequency converter power supply.

[0015] Figure 3 This is a first circuit diagram of a power module provided in an embodiment of the present invention.

[0016] Figure 4 This is a second circuit diagram of a power module provided in an embodiment of the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In one embodiment, see Figure 1 A variable frequency inverter power supply intelligent control circuit includes: Power module 1 is used to receive DC power, divide the DC power and output a voltage signal, and compare the voltage signal with the voltage of a set voltage threshold and a low voltage threshold. The frequency conversion control module 2 is connected to the power supply module 1 and the load module 5. It is used to receive DC power, store and boost discharge through the first energy storage capacitor during the positive half-cycle, store and boost discharge through the second energy storage capacitor during the negative half-cycle, and perform frequency conversion processing on the power released by the first energy storage capacitor and the power released by the second energy storage capacitor to output AC power to power the load module 5. The self-boosting module 4 is connected to the frequency converter control module 2 and is used to change the connection state of the first energy storage capacitor and the second energy storage capacitor, and control the first energy storage capacitor and the second energy storage capacitor in the frequency converter control module 2 to perform series discharge processing in the positive half cycle and the negative half cycle. The microcontroller module 3 is connected to the power supply module 1, the frequency converter control module 2 and the autonomous boost module 4. It is used to control the first energy storage capacitor to perform energy storage and boost discharge during the positive half-cycle, and to control the second energy storage capacitor to perform energy storage and boost discharge during the negative half-cycle. When the voltage signal is less than the voltage threshold and greater than the low voltage threshold, it controls the autonomous boost module 4 to change the connection state of the first energy storage capacitor and the second energy storage capacitor. Load module 5 is used to filter AC power and drive the load.

[0019] In a specific embodiment, the power supply module 1 can be a power circuit composed of a power interface, resistors, comparators, and a reference power supply. It can accept DC power and perform voltage division processing on the DC power. It compares the voltage of the divided power with a set voltage threshold and a low voltage threshold. The voltage threshold is greater than the low voltage threshold and is the lowest voltage value that the frequency conversion control module 2 can input. The frequency conversion control module 2 can be a frequency conversion control circuit composed of field-effect transistors, energy storage capacitors, diodes, etc. It can control the energy storage state of the first energy storage capacitor and the energy storage state of the energy storage capacitor during the positive and negative half-cycles to realize the positive and negative half-cycles. The system performs cyclic energy storage, discharge, voltage boosting, and frequency conversion inversion. The microcontroller module 3 can be a microcontroller circuit composed of a single-chip microcomputer, integrating arithmetic logic unit, controller, memory, and input / output devices to realize functions such as signal processing, data storage, module control, and timing control. The self-boosting module 4 can be a self-boosting circuit composed of thyristors and diodes, which can change the power transmission path, change the working state of the frequency conversion control module 2, and realize voltage diffusion processing. The load module 5 can be a load circuit composed of inductors, capacitors, and load interfaces to filter the input power and supply power to the connected load.

[0020] In this embodiment, please refer to Figure 2 , Figure 3 and Figure 4 The power module 1 includes a power interface; the frequency converter control module 2 includes a first inductor L1, a third diode D3, a fourth diode D4, a fourth power transistor Q4, and a first power transistor Q1; the microcontroller module 3 includes a first controller U1. Specifically, the first end of the power interface is connected to the anode of the third diode D3 and the anode of the fourth diode D4 through the first inductor L1. The cathode of the third diode D3 is connected to the drain of the fourth power transistor Q4. The cathode of the fourth diode D4 is connected to the drain of the first power transistor Q1. The source of the first power transistor Q1 is connected to the source of the fourth power transistor Q4 and the second end of the power interface. The gate of the first power transistor Q1 and the gate of the fourth power transistor Q4 are respectively connected to the IO3 and IO1 terminals of the first controller U1.

[0021] In a specific embodiment, the first power transistor Q1 and the second power transistor Q2 can be N-channel MOSFETs, which can control the energy storage state of the first inductor L1; the first controller U1 can be an STM32 microcontroller.

[0022] Furthermore, the frequency converter control module 2 also includes a first capacitor C1, a fifth thyristor S5, a second inverter J2, a second capacitor C2, a sixth thyristor S6, a first inverter J1, a first diode D1, and a second diode D2. Specifically, the positive terminal of the first capacitor C1 is connected to the cathode of the fourth diode D4, the negative terminal of the first capacitor C1 is connected to one end of the fifth thyristor S5, the other end of the fifth thyristor S5 is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to the cathode of the second diode D2 and the second end of the power interface, the anode of the second diode D2 is connected to one end of the sixth thyristor S6, the other end of the sixth thyristor S6 is connected to the negative terminal of the second capacitor C2, the positive terminal of the second capacitor C2 is connected to the cathode of the third diode D3, and the input terminal of the first inverter J1 is connected to the input terminal of the second inverter J2.

[0023] In a specific embodiment, both the fifth thyristor S5 and the sixth thyristor S6 can be bidirectional thyristors; both the first inverter J1 and the second inverter J2 can be NOT gates; and the first capacitor C1 and the second capacitor C2 can be used as the first energy storage capacitor and the second energy storage capacitor, respectively.

[0024] Furthermore, the frequency converter control module 2 also includes a third power transistor Q3, a fifth power transistor Q5, a second power transistor Q2, and a sixth power transistor Q6; the load module 5 includes a second inductor L2, a fourth capacitor C4, and a load interface; Specifically, the source of the third power transistor Q3 is connected to the anode of the first diode D1, the drain of the third power transistor Q3 is connected to the source of the fifth power transistor Q5 and connected to one end of the fourth capacitor C4 and the first end of the load interface through the second inductor L2, the drain of the fifth power transistor Q5 is connected to the drain of the second power transistor Q2 and the cathode of the first diode D1, the source of the second power transistor Q2 is connected to the drain of the sixth power transistor Q6, the other end of the fourth capacitor C4 and the second end of the load interface, the source of the sixth power transistor Q6 is connected to the anode of the second diode D2, and the gates of the third power transistor Q3, the fifth power transistor Q5, the second power transistor Q2 and the sixth power transistor Q6 are respectively connected to the IO3, IO2, IO4 and IO1 terminals of the first controller U1.

[0025] In a specific embodiment, the third power transistor Q3, the fifth power transistor Q5, the second power transistor Q2, and the sixth power transistor Q6 can all be N-channel MOSFETs. The frequency of the output power can be adjusted by regulating the frequency of the PWM signal input to the fifth power transistor Q5 or the second power transistor Q2.

[0026] Furthermore, the autonomous boost module 4 includes a first thyristor S1, a fifth diode D5, and a second thyristor S2; Specifically, the anode of the first thyristor S1 is connected to the cathode of the third diode D3, the cathode of the first thyristor S1 is connected to the positive terminal of the second capacitor C2, the anode of the second thyristor S2 is connected to the anode of the first diode D1, the cathode of the second thyristor S2 is connected to the negative terminal of the second capacitor C2, the control terminal of the first thyristor S1 is connected to the anode of the fifth diode D5, the control terminal of the second thyristor S2 and the IO5 terminal of the first controller U1, and the cathode of the fifth diode D5 is connected to the input terminal of the second inverter J2.

[0027] In a specific embodiment, both the first thyristor S1 and the second thyristor S2 can be selected as unidirectional thyristors.

[0028] Furthermore, the autonomous boost module 4 also includes a third thyristor S3, a fourth thyristor S4, and a sixth diode D6; Specifically, the anode of the third thyristor S3 is connected to the positive terminal of the first capacitor C1, the cathode of the third thyristor S3 is connected to the negative terminal of the second capacitor C2, the cathode of the fourth thyristor S4 is connected to the negative terminal of the first capacitor C1, the anode of the fourth thyristor S4 is connected to the anode of the second diode D2, the control terminal of the fourth thyristor S4 is connected to the control terminal of the third thyristor S3 and the IO6 terminal of the first controller U1 of the sixth diode D6, and the cathode of the sixth diode D6 is connected to the input terminal of the first inverter J1.

[0029] In a specific embodiment, both the third thyristor S3 and the fourth thyristor S4 can be unidirectional thyristors.

[0030] Furthermore, the power module 1 also includes a first resistor R1, a second resistor R2, a first comparator A1, a first reference power supply VF1, a second reference power supply VF2, and a second comparator A2; Specifically, the inverting input of the first comparator A1 is connected to the first terminal of the first resistor R1 and the non-inverting input of the second comparator A2, and is connected to the second terminal of the power interface through the second resistor R2. The second terminal of the first resistor R1 is connected to the first terminal of the power interface. The non-inverting input of the first comparator A1 and the inverting input of the second comparator A2 are respectively connected to the first reference power supply VF1 and the second reference power supply. The output terminals of the first comparator A1 and the second comparator A2 are respectively connected to the IO7 and IO8 terminals of the first controller U1.

[0031] In a specific embodiment, the first resistor R1 and the second resistor R2 are used for voltage division sampling; the first reference power supply VF1 and the second reference power supply VF2 can provide a voltage threshold and a low voltage threshold, respectively; the first comparator A1 and the second comparator A2 can both be LM358 comparators.

[0032] The present invention discloses the working principle of an intelligent control circuit for a frequency converter inverter power supply. DC power is input through a power interface. The first inverter J1 and the second inverter J2 respectively trigger the sixth thyristor S6 and the fifth thyristor S5 to conduct. During the positive half-cycle, the IO1 terminal of the first controller U1 controls the fourth power transistor Q4 and the sixth power transistor Q6 to conduct. The power interface, the first inductor L1, the third diode D3, and the fourth power transistor Q4 form a circuit, and the first inductor L1 stores energy. Then, the IO1 terminal of the first controller U1 stops working, and the power interface, the first inductor L1, the third diode D3, the second capacitor C2, the sixth thyristor S6, and the second diode D2 form a circuit, allowing the DC power input through the power interface to interact with the energy stored in the first inductor L1. The discharge is stored by the first capacitor C1 and the second capacitor C2. Then, the IO1 terminal of the first controller U1 controls the fourth power transistor Q4 and the sixth power transistor Q6 to conduct. At the same time, the IO2 terminal of the first controller U1 controls the fifth power transistor Q5 to conduct, and the frequency can be adjusted by adjusting the conduction frequency of the fifth power transistor Q5. The second capacitor C2, the fourth power transistor Q4, the fifth power transistor Q5, the second inductor L2, the load interface, the sixth power transistor Q6, and the sixth thyristor S6 form a circuit, which stores and filters the fourth power transistor, and then provides power to the load interface for the positive half-cycle. Similarly, in the negative half-cycle, the IO3 terminal of the first controller U1 controls the first power transistor Q1 and the third power transistor Q3 to conduct. The power interface, the first inductor L1, the fourth power transistor Q4, the fifth power transistor Q5, the second inductor L2, the third power transistor Q6, the fourth power transistor Q4, the fifth power transistor Q5, the sixth power transistor Q6, and the sixth thyristor S6 form a circuit, which stores and filters the fourth power transistor, and then provides power to the load interface for the positive half-cycle. Transistor D4 and the first power transistor Q1 form a circuit. The first inductor L1 stores energy. The IO3 terminal of the first controller U1 stops working. The first capacitor C1 and the second capacitor C2 store energy. The IO3 terminal of the first controller U1 is active. The IO4 terminal of the first controller U1 controls the conduction state of the second power transistor Q2, so that the first capacitor C1, the first power transistor Q1, the second power transistor Q2, the load interface, the second inductor L2, the third power transistor Q3, and the fifth thyristor S5 form a circuit. The fourth power source stores and filters energy, and then provides negative half-cycle energy to the load interface. The DC power is divided and sampled by the first resistor R1 and the second resistor R2. When the signal after voltage division is less than the voltage threshold provided by the first reference power supply VF1 and greater than the voltage threshold provided by the second reference power supply VF1, the signal is considered valid. When the low voltage threshold provided by F2 is reached, the first comparator A1 and the second comparator A2 output high levels, which are received by the IO7 and IO8 terminals of the first controller U1, respectively. During the positive half-cycle, the IO6 terminal of the first controller U1 will control the conduction of the fifth power transistor Q5 via the IO2 terminal of the first controller U1, triggering the conduction of the third thyristor S3 and the fourth thyristor S4. The fifth thyristor S5 and the sixth thyristor S6 will be turned off, and the first controller U1 will complete the operation control for the positive half-cycle. This results in a circuit consisting of the second capacitor C2, the fourth power transistor Q4, the fifth power transistor Q5, the second inductor L2, the load interface, the sixth power transistor Q6, the fourth thyristor S4, the first capacitor C1, and the third thyristor S3, which stores and filters the fourth power source.This provides power to the load interface for the positive half-cycle. Similarly, during the negative half-cycle, when the IO5 terminal of the first controller U1 controls the IO4 terminal of the first controller U1 to turn on the second power transistor Q2, it triggers the first thyristor S1 and the second thyristor S2 to turn on. This creates a circuit consisting of the first capacitor C1, the first power transistor Q1, the second power transistor Q2, the load interface, the second inductor L2, the third power transistor Q3, the second thyristor S2, the second capacitor C2, and the first thyristor S1. Energy is stored and filtered by the fourth power source, thus providing power to the load interface for the negative half-cycle.

[0033] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A smart control circuit for a frequency converter inverter power supply, characterized in that, The circuit includes: The power module is used to receive DC power, divide the DC power and output a voltage signal, and compare the voltage signal with the voltage of a set voltage threshold and a low voltage threshold. The frequency conversion control module is connected to the power supply module and the load module. It is used to receive DC power, store and boost discharge through the first energy storage capacitor during the positive half cycle, and store and boost discharge through the second energy storage capacitor during the negative half cycle. It performs frequency conversion processing on the energy released by the first energy storage capacitor and the energy released by the second energy storage capacitor and outputs AC power to supply power to the load module. The self-boosting module is connected to the frequency converter control module and is used to change the connection state of the first energy storage capacitor and the second energy storage capacitor, and control the first energy storage capacitor and the second energy storage capacitor in the frequency converter control module to perform series discharge processing in the positive half cycle and the negative half cycle. The microcontroller module is connected to the power supply module, the frequency converter control module, and the autonomous boost module. It is used to control the first energy storage capacitor to perform energy storage and boost discharge during the positive half-cycle, and to control the second energy storage capacitor to perform energy storage and boost discharge during the negative half-cycle. When the voltage signal is less than the voltage threshold and greater than the low voltage threshold, it controls the autonomous boost module to change the connection state of the first energy storage capacitor and the second energy storage capacitor. The load module is used to filter AC power and drive the load.

2. The intelligent control circuit for a frequency converter power supply according to claim 1, characterized in that, The frequency conversion control module includes a first inductor, a third diode, a fourth diode, a fourth power transistor, and a first power transistor; the microcontroller module includes a first controller; The first end of the power interface is connected to the anode of the third diode and the anode of the fourth diode through the first inductor. The cathode of the third diode is connected to the drain of the fourth power transistor. The cathode of the fourth diode is connected to the drain of the first power transistor. The source of the first power transistor is connected to the source of the fourth power transistor and the second end of the power interface. The gates of the first power transistor and the fourth power transistor are respectively connected to the IO3 and IO1 terminals of the first controller.

3. The intelligent control circuit for a frequency converter power supply according to claim 2, characterized in that, The frequency conversion control module also includes a first capacitor, a fifth thyristor, a second inverter, a second capacitor, a sixth thyristor, a first inverter, a first diode, and a second diode; The positive terminal of the first capacitor is connected to the cathode of the fourth diode, the negative terminal of the first capacitor is connected to one end of the fifth thyristor, the other end of the fifth thyristor is connected to the anode of the first diode, the cathode of the first diode is connected to the cathode of the second diode and the second end of the power interface, the anode of the second diode is connected to one end of the sixth thyristor, the other end of the sixth thyristor is connected to the negative terminal of the second capacitor, the positive terminal of the second capacitor is connected to the cathode of the third diode, and the input terminal of the first inverter is connected to the input terminal of the second inverter.

4. The intelligent control circuit for a frequency converter power supply according to claim 3, characterized in that, The frequency conversion control module also includes a third power transistor, a fifth power transistor, a second power transistor, and a sixth power transistor; the load module includes a second inductor, a fourth capacitor, and a load interface; The source of the third power transistor is connected to the anode of the first diode. The drain of the third power transistor is connected to the source of the fifth power transistor and connected to one end of the fourth capacitor and the first end of the load interface through the second inductor. The drain of the fifth power transistor is connected to the drain of the second power transistor and the cathode of the first diode. The source of the second power transistor is connected to the drain of the sixth power transistor, the other end of the fourth capacitor and the second end of the load interface. The source of the sixth power transistor is connected to the anode of the second diode. The gates of the third power transistor, the fifth power transistor, the second power transistor and the sixth power transistor are respectively connected to the IO3, IO2, IO4 and IO1 terminals of the first controller.

5. The intelligent control circuit for a frequency converter power supply according to claim 4, characterized in that, The autonomous boost module includes a first thyristor, a fifth diode, and a second thyristor; The anode of the first thyristor is connected to the cathode of the third diode, the cathode of the first thyristor is connected to the positive terminal of the second capacitor, the anode of the second thyristor is connected to the anode of the first diode, the cathode of the second thyristor is connected to the negative terminal of the second capacitor, the control terminal of the first thyristor is connected to the anode of the fifth diode, the control terminal of the second thyristor and the IO5 terminal of the first controller, and the cathode of the fifth diode is connected to the input terminal of the second inverter.

6. The intelligent control circuit for a frequency converter power supply according to claim 5, characterized in that, The autonomous boost module also includes a third thyristor, a fourth thyristor, and a sixth diode; The anode of the third thyristor is connected to the positive terminal of the first capacitor, the cathode of the third thyristor is connected to the negative terminal of the second capacitor, the cathode of the fourth thyristor is connected to the negative terminal of the first capacitor, the anode of the fourth thyristor is connected to the anode of the second diode, the control terminal of the fourth thyristor is connected to the control terminal of the third thyristor and the IO6 terminal of the first controller of the sixth diode, and the cathode of the sixth diode is connected to the input terminal of the first inverter.

7. The intelligent control circuit for a frequency converter power supply according to claim 6, characterized in that, The power module further includes a first resistor, a second resistor, a first comparator, a first reference power supply, a second reference power supply, and a second comparator; The inverting input of the first comparator is connected to the first terminal of the first resistor and the non-inverting input of the second comparator, and is connected to the second terminal of the power interface through the second resistor. The second terminal of the first resistor is connected to the first terminal of the power interface. The non-inverting input of the first comparator and the inverting input of the second comparator are respectively connected to the first reference power supply and the second reference power supply. The output terminals of the first comparator and the second comparator are respectively connected to the IO7 and IO8 terminals of the first controller.

Images