Voltage stabilizer based on voltage conversion, control method and storage medium

Abstract

The invention provides a voltage stabilizer based on voltage conversion, a control method and a storage medium, and the voltage stabilizer comprises a PFC chopping boost circuit which receives an input alternating current and a boost duty ratio, carries out the chopping boost of the input alternating current based on the boost duty ratio, and outputs a high-voltage chopping alternating current signal; the positive and negative half-cycle filter circuit is connected with the PFC chopping booster circuit and is used for rectifying and filtering the high-voltage chopping alternating-current signal to obtain a positive voltage-stabilizing chopping alternating-current signal and a negative voltage-stabilizing chopping alternating-current signal; the positive and negative half-cycle voltage reduction and stabilization circuit is connected with the positive and negative half-cycle filter circuit, receives the voltage reduction duty ratio, and performs voltage reduction and stabilization on the positive voltage stabilization chopping alternating current signal and the negative voltage stabilization chopping alternating current signal based on the voltage reduction duty ratio to obtain a preset actual positive electric signal and a preset actual negative electric signal; and the output voltage merging circuit is connected with the positive and negative half-cycle voltage reducing and stabilizing circuit, and integrates the preset actual positive electric signal and the preset actual negative electric signal to obtain a voltage stabilizing electric signal. According to the invention, the voltage fluctuation is quickly responded at low cost.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a voltage regulator, control method and storage medium based on voltage conversion. Background Technology

[0002] Power electronic conversion technology is a core supporting technology in key areas of modern society such as industrial production, consumer electronics, and communications, and its performance directly determines the quality of the power supply system. Among them, the voltage conversion technology between alternating currents (AC) and AC is a crucial link in ensuring that different electrical equipment is adapted to the grid voltage and resisting grid fluctuations. It plays an irreplaceable role in scenarios with stringent power quality requirements, such as precision manufacturing equipment, data center servers, and communication base stations.

[0003] Currently, most mainstream AC voltage conversion solutions on the market adopt a bipolar conversion architecture of AC-DC-AC. This architecture works by first converting the input AC to DC through rectification, then stabilizing it through an intermediate DC energy storage stage, and finally inverting the DC back into AC at the target frequency and amplitude through an inverter circuit. While this bipolar conversion architecture can achieve voltage conversion, its limitations lead to decreased dynamic response performance and high costs, making it unable to quickly and cost-effectively respond to grid voltage fluctuations. Summary of the Invention

[0004] To provide a low-cost and rapid response to grid voltage fluctuations, embodiments of this application provide a voltage conversion-based regulator, control method, and storage medium.

[0005] In a first aspect, this embodiment provides a voltage regulator based on voltage conversion, the voltage regulator comprising: A PFC chopper boost circuit is used to receive input AC power and obtain the boost duty cycle used to control the controllable switch in the PFC chopper boost circuit. Based on the boost duty cycle, the input AC power is chopper boosted to output a high-voltage chopped AC signal. The positive and negative half-cycle filtering circuit is connected to the output terminal of the PFC chopper boost circuit. It is used to rectify and filter the positive high-voltage chopper AC signal and the negative high-voltage chopper AC signal respectively to obtain the positive regulated chopper AC signal and the negative regulated chopper AC signal. A positive and negative half-cycle step-down voltage regulator circuit is connected to the output terminal of the positive and negative half-cycle filter circuit. It is used to receive the step-down duty cycle and perform step-down voltage regulation on the positive regulated chopper AC signal and the negative regulated chopper AC signal based on the step-down duty cycle to obtain a preset actual positive electrical signal and a preset actual negative electrical signal. The output voltage merging circuit is connected to the positive and negative half-cycle buck regulator circuit to integrate the preset actual positive electrical signal and the preset actual negative electrical signal to obtain a regulated electrical signal.

[0006] In some embodiments, the PFC chopper boost circuit includes a first inductor, a first N-type IGBT, and a second N-type IGBT, wherein... The input terminal of the first inductor receives the input AC power, the output terminal of the first inductor is connected to the emitter of the second N-type IGBT, the collector of the second N-type IGBT is connected to the collector of the first N-type IGBT, and the emitter of the first N-type IGBT is connected to the neutral wire. The gates of the first N-type IGBT and the second N-type IGBT receive the boost duty cycle to boost the input AC power, so as to output a high-voltage chopped AC signal through the output terminal of the first inductor.

[0007] In some embodiments, the boost duty cycle includes a positive boost duty cycle and a negative boost duty cycle, and obtaining the boost duty cycle used to control the controllable switch in the PFC chopper boost circuit includes: Obtain the most recent output voltage and the preset boost value in the PFC chopper boost circuit, and determine the voltage deviation based on the preset boost value and the most recent output voltage; The voltage deviation is processed using a PID controller to obtain the duty cycle adjustment. Based on the input AC power, obtain the electrical signal symbol and the most recent boost duty cycle corresponding to the electrical signal symbol; If the electrical signal sign is positive, add the duty cycle adjustment amount to the most recent boost duty cycle to obtain a positive boost duty cycle; If the electrical signal sign is negative, the most recent boost duty cycle is added to the duty cycle adjustment amount to obtain a negative boost duty cycle.

[0008] In some embodiments, the positive and negative half-cycle filter circuit includes a positive half-cycle filter circuit and a negative half-cycle filter circuit, wherein, The positive half-cycle filter circuit includes a first diode and a first capacitor, and the negative half-cycle filter circuit includes a second diode and a second capacitor. The anode of the first diode is connected to the output terminal of the first inductor to receive a positive high voltage chop AC signal. The cathode of the first diode is connected to the positive terminal of the first capacitor. The negative terminal of the first capacitor is grounded. The positive terminal of the first capacitor outputs a positive regulated chop AC signal. The cathode of the second diode is connected to the output terminal of the first inductor to receive the negative high-voltage chopped AC signal. The anode of the second diode is connected to the negative terminal of the second capacitor. The positive terminal of the second capacitor is grounded. The negative terminal of the second capacitor outputs a negative regulated chopped AC signal.

[0009] In some embodiments, the positive and negative half-cycle buck regulator circuit includes a positive half-cycle buck regulator circuit and a negative half-cycle buck regulator circuit, and the buck duty cycle includes a positive buck duty cycle and a negative buck duty cycle, wherein, The positive half-cycle buck regulator circuit includes a third N-type IGBT, a second inductor, a third diode, and a third capacitor; the negative half-cycle buck regulator circuit includes a fourth N-type IGBT, a third inductor, a fourth diode, and a fourth capacitor. The collector of the third N-type IGBT is connected to the positive terminal of the first capacitor to receive a positive regulated chopper AC signal. The gate of the third N-type IGBT receives a positive buck duty cycle. The emitter of the third N-type IGBT is connected to the cathode of the third diode and one end of the second inductor. The anode of the third diode is grounded. The other end of the second inductor is connected to the positive terminal of the third capacitor. The negative terminal of the third capacitor is grounded. The positive terminal of the third capacitor outputs a preset actual positive electrical signal. The emitter of the fourth N-type IGBT is connected to the negative terminal of the second capacitor to receive a negative regulated chopper AC signal. The gate of the fourth N-type IGBT receives a negative step-down duty cycle. The collector of the fourth N-type IGBT is connected to the anode of the fourth diode and one end of the third inductor. The cathode of the fourth diode is grounded. The other end of the third inductor is connected to the negative terminal of the fourth capacitor. The positive terminal of the fourth capacitor is grounded. The negative terminal of the fourth capacitor outputs a preset actual negative electrical signal.

[0010] In some embodiments, the buck duty cycle includes a positive buck duty cycle and a negative buck duty cycle, and the receiving buck duty cycle includes: Obtain the preset voltage value; If the electrical signal is positive, obtain the most recent actual positive voltage regulation value and the most recent positive buck duty cycle of the most recent output in the positive half-cycle buck regulator circuit, and determine the positive voltage regulation deviation value based on the most recent preset actual positive electrical signal and the preset voltage value; If the positive voltage regulation deviation is zero, the most recent positive buck duty cycle will be taken as the positive buck duty cycle; If the positive voltage regulation deviation value is not zero, the positive voltage regulation deviation value is processed by the PID controller to obtain the positive buck duty cycle adjustment amount, and the most recent positive buck duty cycle is added to the positive buck duty cycle adjustment amount to obtain the positive buck duty cycle; If the electrical signal is negative, obtain the most recent actual negative voltage regulation value and the most recent negative voltage buck duty cycle of the most recent output in the negative half-cycle buck voltage regulation circuit, and determine the negative voltage regulation deviation value based on the most recent preset actual negative electrical signal and the preset voltage value. If the negative voltage regulation deviation value is zero, the most recent negative voltage drop duty cycle shall be taken as the negative voltage drop duty cycle; If the negative voltage regulation deviation value is not zero, the negative voltage regulation deviation value is processed by the PID controller to obtain the negative buck duty cycle adjustment amount, and the most recent negative buck duty cycle is added to the negative buck duty cycle adjustment amount to obtain the negative buck duty cycle.

[0011] In some embodiments, the output voltage combining circuit includes a fifth capacitor, wherein, The positive terminal of the third capacitor and the negative terminal of the fourth capacitor are connected to the first terminal of the fifth capacitor. The second terminal of the fifth capacitor is grounded, and the first terminal of the fifth capacitor outputs a regulated electrical signal.

[0012] Secondly, this embodiment provides a control method for a voltage-conversion-based regulator, using a voltage-conversion-based regulator as described in the first aspect, the method comprising: The circuit receives input AC power and obtains the boost duty cycle. Based on the boost duty cycle, it controls the operating state of the PFC chopper boost circuit to process the input AC power to obtain a high-voltage chopped AC signal. The high-voltage chopped AC signal includes a positive high-voltage chopped AC signal and a negative high-voltage chopped AC signal. The positive high-voltage chopped AC signal and the negative high-voltage chopped AC signal are rectified and filtered respectively to obtain the positive regulated chopped AC signal and the negative regulated chopped AC signal; Obtain the buck duty cycle, and control the working state of the positive and negative half-cycle buck regulator circuit to process the positive and negative regulated AC signals based on the buck duty cycle, so as to obtain the preset actual positive signal and the preset actual negative signal. The preset actual positive electrical signal and the preset actual negative electrical signal are integrated to obtain a regulated electrical signal.

[0013] In some embodiments, the boost duty cycle includes a positive boost duty cycle and a negative boost duty cycle, and obtaining the boost duty cycle includes: Obtain the most recent output voltage and the preset boost value in the PFC chopper boost circuit, and determine the voltage deviation based on the preset boost value and the most recent output voltage; The voltage deviation is processed using a PID controller to obtain the duty cycle adjustment. Based on the input AC power, obtain the electrical signal symbol and the most recent boost duty cycle corresponding to the electrical signal symbol; If the electrical signal sign is positive, add the duty cycle adjustment amount to the most recent boost duty cycle to obtain a positive boost duty cycle; If the electrical signal sign is negative, the most recent boost duty cycle is added to the duty cycle adjustment amount to obtain a negative boost duty cycle.

[0014] Thirdly, this embodiment provides a computer-readable storage medium storing a computer program that can run on a processor, wherein the computer program, when executed by the processor, implements a control method for a voltage-conversion-based regulator as described in the second aspect.

[0015] By employing the aforementioned voltage regulator, the voltage regulator of this application includes: a PFC chopper boost circuit, used to receive input AC power and acquire the boost duty cycle used to control the controllable switch in the PFC chopper boost circuit, and to chop and boost the input AC power based on the boost duty cycle to output a high-voltage chopped AC signal; a positive and negative half-cycle filter circuit, connected to the output terminal of the PFC chopper boost circuit, used to rectify and filter the positive and negative high-voltage chopped AC signals respectively to obtain a positive regulated chopped AC signal and a negative regulated chopped AC signal; and a positive and negative half-cycle buck regulator circuit, connected to the output terminal of the positive and negative half-cycle filter circuit, used to receive the buck duty cycle, and to buck and regulate the positive and negative regulated chopped AC signals respectively based on the buck duty cycle to obtain a preset actual positive signal and a preset actual negative signal. The output voltage merging circuit, connected to the positive and negative half-cycle buck regulator circuit, integrates the preset actual positive and negative electrical signals to obtain a regulated electrical signal. Thus, the voltage converter regulator of this application adopts a small-size and low-cost architecture, eliminating the need for a complex bipolar converter architecture. By controlling the corresponding duty cycle, it can respond quickly and accurately to fluctuations in the mains voltage with a small size and low cost. Attached Figure Description

[0016] Figure 1 This is a circuit diagram of a voltage regulator based on voltage conversion provided in this application.

[0017] Figure 2 This is a block diagram of a method provided in this application for obtaining the boost duty cycle of a controllable switch in a PFC chopper boost circuit.

[0018] Figure 3 This application provides a control method for a voltage regulator based on voltage conversion. Detailed Implementation

[0019] To better understand the purpose, technical solutions, and advantages of this application, it has been described and illustrated below with reference to the accompanying drawings and embodiments. However, those skilled in the art should understand that this application can be implemented without these details. It will be apparent to those skilled in the art that various modifications can be made to the embodiments disclosed in this application, and the general principles defined in this application can be applied to other embodiments and application scenarios without departing from the principles and scope of this application. Therefore, this application is not limited to the illustrated embodiments, but is consistent with the broadest scope claimed in this application.

[0020] The embodiments of this application will now be described in further detail with reference to the accompanying drawings.

[0021] Figure 1 This is a circuit diagram of a voltage regulator based on voltage conversion provided in this application. Figure 1 As shown, a voltage regulator based on voltage conversion includes a PFC chopper boost circuit, a positive and negative half-cycle filter circuit, a positive and negative half-cycle buck regulator circuit, and an output voltage merging circuit. The positive and negative half-cycle filter circuit includes a positive half-cycle filter circuit and a negative half-cycle filter circuit, and the positive and negative half-cycle buck regulator circuit includes a positive half-cycle buck regulator circuit and a negative half-cycle buck regulator circuit.

[0022] The PFC chopper boost circuit is used to receive the input AC power and obtain the boost duty cycle used to control the controllable switch in the PFC chopper boost circuit. Based on the boost duty cycle, the input AC power is chopped and boosted to output a high-voltage chopped AC signal.

[0023] The PFC chopper boost circuit includes a first inductor L1, a first N-type IGBT Q1, and a second N-type IGBT Q2. The input terminal of the first inductor L1 receives the input AC power, the output terminal of the first inductor L1 is connected to the emitter of the second N-type IGBT Q2, the collector of the second N-type IGBT Q2 is connected to the collector of the first N-type IGBT Q1, and the emitter of the first N-type IGBT Q1 is connected to the neutral wire.

[0024] The first N-type IGBT Q1 and the second N-type IGBT Q2 represent the controllable switches in the aforementioned PFC chopper boost circuit. The boost duty cycle includes a positive boost duty cycle and a negative boost duty cycle. The positive boost duty cycle represents the duty cycle during the positive half-cycle of the input AC current for chopping and boosting operations, while the negative boost duty cycle represents the duty cycle during the negative half-cycle of the input AC current for chopping and boosting operations. The gate of the first N-type IGBT Q1 receives the positive boost duty cycle to achieve boosting operation during the positive half-cycle of the input AC current, and the gate of the second N-type IGBT Q2 receives the negative boost duty cycle to achieve boosting operation during the negative half-cycle of the input AC current. A high-voltage chopped AC signal, containing both positive and negative high-voltage chopped AC signals, is output through the output terminal of the first inductor.

[0025] Specifically, when the input AC current is in the positive half-cycle, the corresponding first N-type IGBT Q1 receives a positive boost duty cycle, thus storing energy in the first inductor L1 when it is turned on and releasing energy when it is turned off, thereby outputting a positive high-voltage chopped AC signal. Similarly, when the input AC current is in the negative half-cycle, the corresponding second N-type IGBT Q2 receives a negative boost duty cycle, thus storing energy in the first inductor L1 when it is turned on and releasing energy when it is turned off, thereby outputting a negative high-voltage chopped AC signal. In this way, the PFC chopper boost circuit receives the input AC current and generates a high reverse peak voltage of thousands of volts by controlling the boost duty cycle, thereby improving conversion efficiency and power factor.

[0026] In order to solve the problem of slow output voltage response when the voltage changes rapidly, the voltage fluctuation can be monitored in real time and the boost duty cycle of the PFC chopper boost circuit can be dynamically adjusted to achieve rapid voltage tracking. That is, the boost duty cycle needs to be determined. Figure 2 This is a block diagram of a method provided in this application for obtaining the boost duty cycle of a controllable switch in a PFC chopper boost circuit. (See diagram for example.) Figure 2 As shown, obtaining the boost duty cycle used to control the controllable switch in the PFC chopper boost circuit includes the following steps: Step S101: Obtain the most recent output voltage and the preset boost value in the PFC chopper boost circuit, and determine the voltage deviation based on the preset boost value and the most recent output voltage.

[0027] Step S102: Use a PID controller to process the voltage deviation to obtain the duty cycle adjustment amount.

[0028] Step S103: Obtain the electrical signal symbol based on the input AC power, and obtain the most recent boost duty cycle corresponding to the electrical signal symbol.

[0029] Step S104: If the electrical signal sign is positive, add the duty cycle adjustment amount to the most recent boost duty cycle to obtain a positive boost duty cycle.

[0030] Step S105: If the electrical signal sign is negative, add the duty cycle adjustment amount to the most recent boost duty cycle to obtain a negative boost duty cycle.

[0031] The aforementioned most recent output voltage refers to the latest high-voltage chopped AC signal output by the PFC chopper boost circuit within its current cycle attribute. The preset boost value refers to the voltage value the user expects the PFC chopper boost circuit to achieve. The most recent output voltage can be obtained by measuring the output terminal of the PFC chopper boost circuit, and the preset boost value can be obtained by reading stored information. The voltage deviation is then obtained by subtracting the preset boost value from the most recent output voltage. If the voltage deviation is positive, it indicates that the actual most recent output voltage is too high, and the boost duty cycle needs to be reduced. If the voltage deviation is negative, it indicates that the actual most recent output voltage is insufficient, and the boost duty cycle needs to be increased. If the voltage deviation is zero, it indicates that the actual most recent output voltage meets the preset boost value, meaning that no adjustment to the boost duty cycle is required.

[0032] The voltage deviation obtained above is then fed into a voltage loop PID controller. The PID controller calculates an adjustment amount, i.e., the duty cycle adjustment amount, based on the magnitude, integral, and derivative of the error. The sign of the electrical signal can then be obtained by checking whether the input AC current is in the positive or negative half-cycle. If the input AC current is in the positive half-cycle, the electrical signal sign is positive. If the input AC current is in the negative half-cycle, the electrical signal sign is negative.

[0033] The aforementioned most recent boost duty cycle specifically refers to the most recently determined boost duty cycle of the input AC power within its current cycle attribute. This most recent boost duty cycle can be obtained by reviewing the information already available. When the signal sign is positive, the obtained most recent boost duty cycle is added to the duty cycle adjustment amount to obtain the positive boost duty cycle that needs to be controlled at the gate of the first N-type GIBT transistor Q1 in the PFC chopper boost circuit. This ensures that the PFC chopper boost circuit can stably and efficiently output a high-voltage chopped AC signal, thereby achieving stable and efficient voltage boosting. When the signal sign is negative, the obtained most recent boost duty cycle is added to the duty cycle adjustment amount to obtain the negative boost duty cycle that needs to be controlled at the gate of the second N-type GIBT transistor Q2 in the PFC chopper boost circuit. This ensures that the PFC chopper boost circuit can stably and efficiently output a high-voltage chopped AC signal, thereby achieving stable and efficient voltage boosting.

[0034] Preferably, to improve voltage conversion efficiency and reduce energy consumption, the operating state of the PFC chopper circuit can be automatically adjusted based on the load. This involves acquiring the load state of the load connected to the regulator output. If the load state is no-load, the PFC chopper boost circuit will operate at zero frequency, entering an energy-saving mode, such as standby mode. In this energy-saving mode, the switching losses and core losses of the PFC chopper boost circuit are significantly reduced, resulting in a substantial decrease in standby power. When the load state is not no-load, the PFC chopper boost circuit operates at its operating frequency, entering standby mode.

[0035] The positive and negative half-cycle filter circuits are connected to the output of the PFC chopper boost circuit. They are used to rectify and filter the positive and negative high-voltage chopped AC signals, respectively, to obtain positive and negative regulated chopped AC signals. The positive and negative half-cycle filter circuits include a positive half-cycle filter circuit and a negative half-cycle filter circuit.

[0036] The positive half-cycle filter circuit includes a first diode D1 and a first capacitor C1, and the negative half-cycle filter circuit includes a second diode D2 and a second capacitor C2. The anode of the first diode D1 is connected to the output terminal of the first inductor L1 to receive a positive high-voltage chopped AC signal. The cathode of the first diode D1 is connected to the positive terminal of the first capacitor C1, and the negative terminal of the first capacitor C1 is grounded. The positive terminal of the first capacitor C1 outputs a positive regulated chopped AC signal. The cathode of the second diode D2 is connected to the output terminal of the first inductor L1 to receive a negative high-voltage chopped AC signal. The anode of the second diode D2 is connected to the negative terminal of the second capacitor C2, and the positive terminal of the second capacitor C2 is grounded. The negative terminal of the second capacitor C2 outputs a negative regulated chopped AC signal.

[0037] The positive half-cycle filter circuit rectifies and filters the positive high-voltage chopped AC signal, removing high-frequency noise and ensuring stable operation of subsequent circuits. The negative half-cycle filter circuit rectifies and filters the negative high-voltage chopped AC signal, removing high-frequency noise and ensuring stable operation of subsequent circuits.

[0038] A positive and negative half-cycle buck regulator circuit, connected to the output of a positive and negative half-cycle filter circuit, is used to receive the buck duty cycle. Based on the buck duty cycle, it performs buck regulation on the positive and negative regulated AC signals respectively to obtain a preset actual positive and a preset actual negative electrical signal. The positive and negative half-cycle buck regulator circuit includes a positive half-cycle buck regulator circuit and a negative half-cycle buck regulator circuit, and the buck duty cycle includes a positive buck duty cycle and a negative buck duty cycle.

[0039] The positive half-cycle buck regulator circuit includes a third N-type IGBT Q3, a second inductor L2, a third diode D3, and a third capacitor C3. The collector of the third N-type IGBT Q3 is connected to the positive terminal of the first capacitor C1 to receive the positive regulated chopper AC signal. The gate of the third N-type IGBT Q3 receives the positive buck duty cycle. The emitter of the third N-type IGBT Q3 is connected to the cathode of the third diode D3 and one end of the second inductor L2. The anode of the third diode D3 is grounded. The other end of the second inductor L2 is connected to the positive terminal of the third capacitor C3. The negative terminal of the third capacitor C3 is grounded. The positive terminal of the third capacitor C3 outputs a preset actual positive electrical signal.

[0040] The negative half-cycle buck regulator circuit includes a fourth N-type IGBT Q4, a third inductor L3, a fourth diode D4, and a fourth capacitor C4. The emitter of the fourth N-type IGBT Q4 is connected to the negative terminal of the second capacitor C2 to receive the negative regulated chopper AC signal. The gate of the fourth N-type IGBT Q4 receives the negative buck duty cycle. The collector of the fourth N-type IGBT Q4 is connected to the anode of the fourth diode D4 and one end of the third inductor L3. The cathode of the fourth diode D4 is grounded. The other end of the third inductor L3 is connected to the negative terminal of the fourth capacitor C4. The positive terminal of the fourth capacitor C4 is grounded. The negative terminal of the fourth capacitor C4 outputs the actual negative electrical signal.

[0041] Specifically, when the positive half-cycle filter circuit outputs a positive stable chopped AC signal, the corresponding third N-type IGBT Q3 receives a positive step-down duty cycle. This allows the second inductor L2 to store energy when the circuit is on and release energy when it is off. Simultaneously, the third diode D3 and the third capacitor C3 provide voltage regulation, achieving a stable and accurate step-down of the positive stable chopped AC signal. The preset positive signal is then output through the positive terminal of the third capacitor. In this way, the positive half-cycle filter circuit stably steps down the positive regulated chopped AC signal output from the positive half-cycle filter circuit, adjusting it to the required positive voltage, i.e., the preset positive signal.

[0042] When the negative half-cycle filter circuit outputs a negative stable chopped AC signal, the corresponding fourth N-type IGBT Q4 receives a negative step-down duty cycle. This allows the third inductor L3 to store energy during turn-on and release energy during turn-off. Simultaneously, the fourth diode D4 and the fourth capacitor C4 provide voltage regulation, achieving a stable and accurate step-down of the negative regulated chopped AC signal. The preset negative signal is then output through the negative terminal of the third capacitor. In this way, the negative half-cycle filter circuit stably steps down the negative regulated chopped AC signal, adjusting it to the required negative voltage, i.e., the preset negative signal.

[0043] To enable faster and more accurate voltage conversion, the buck duty cycle can be automatically adjusted based on the load and the desired preset voltage value. The step-down duty cycle measurement includes the following steps: Step S301: Obtain the preset voltage value.

[0044] Step S302: If the electrical signal sign is positive, obtain the most recent actual positive voltage regulation value and the most recent positive buck duty cycle of the most recent output in the positive half-cycle buck regulator circuit, and determine the positive voltage regulation deviation value based on the most recent preset actual positive electrical signal and preset voltage value.

[0045] Step S303: If the positive voltage regulation deviation value is zero, the most recent positive voltage buck duty cycle is taken as the positive voltage buck duty cycle.

[0046] Step S304: If the positive voltage regulation deviation value is not zero, use the PID controller to process the positive voltage regulation deviation value to obtain the positive buck duty cycle adjustment amount, and add the most recent positive buck duty cycle to the positive buck duty cycle adjustment amount to obtain the positive buck duty cycle.

[0047] Step S305: If the electrical signal sign is negative, obtain the most recent actual negative voltage regulation value and the most recent negative voltage buck duty cycle of the most recent output in the negative half-cycle buck voltage regulator circuit, and determine the negative voltage regulation deviation value based on the most recent preset actual negative electrical signal and preset voltage value.

[0048] Step S306: If the negative voltage regulation deviation value is zero, the most recent negative voltage drop duty cycle is taken as the negative voltage drop duty cycle.

[0049] Step S307: If the negative voltage regulation deviation value is not zero, use the PID controller to process the negative voltage regulation deviation value to obtain the negative buck duty cycle adjustment amount, and add the most recent negative buck duty cycle to the negative buck duty cycle adjustment amount to obtain the negative buck duty cycle.

[0050] The aforementioned preset voltage value refers to the rated voltage value required by the device connected to the output terminal of the output voltage merging circuit, which can be obtained by the user sending the preset voltage value.

[0051] The electrical signal symbol has been obtained above. If the electrical signal symbol is positive, it indicates that the input AC power is in the positive half-cycle, at which time the positive half-cycle buck regulator circuit is working. The most recent actual positive regulated voltage value specifically refers to the latest output voltage value of the output voltage combining circuit during the positive half-cycle, and the most recent positive buck duty cycle specifically refers to the latest determined buck duty cycle of the positive half-cycle buck regulator circuit during the positive half-cycle. The most recent actual positive regulated voltage value and the most recent positive buck duty cycle can be obtained by checking the obtained information. Then, the positive stability deviation value is obtained by subtracting the preset voltage value from the most recent preset actual positive electrical signal.

[0052] If the positive stability deviation is zero, it indicates that the voltage regulator is outputting stably and accurately. At this time, there is no need to adjust the working state of the positive half-cycle buck regulator circuit, that is, there is no need to adjust the positive buck duty cycle. The most recent positive buck duty cycle is determined as the positive buck duty cycle.

[0053] If the positive stability deviation is not zero, it indicates that the voltage regulator is not outputting stably and accurately. In this case, it is necessary to adjust the operating state of the positive half-cycle buck regulator circuit. That is, the positive stability deviation value obtained above is sent to a voltage loop PID controller. The PID controller will calculate an adjustment amount based on the magnitude, integral, and derivative of the error, which is the positive buck duty cycle adjustment amount. Then, the sum of the most recent positive buck duty cycle obtained above and this positive buck duty cycle adjustment amount is taken as the positive buck duty cycle.

[0054] Similarly, if the electrical signal sign is negative, it indicates that the input AC current is in the negative half-cycle, at which time the negative half-cycle buck regulator circuit is working. The aforementioned most recent actual negative regulated voltage value specifically refers to the latest output voltage value of the output voltage combining circuit during the negative half-cycle, and the most recent negative buck duty cycle specifically refers to the latest determined buck duty cycle of the negative half-cycle buck regulator circuit during the negative half-cycle. The most recent actual negative regulated voltage value and the most recent negative buck duty cycle can be obtained by checking the information already available. Then, the negative stability deviation value is obtained by subtracting the preset voltage value from the most recent preset actual negative electrical signal.

[0055] If the negative stability deviation value is zero, it indicates that the voltage regulator is outputting stably and accurately. At this time, there is no need to adjust the working state of the negative half-cycle buck regulator circuit, that is, there is no need to adjust the negative buck duty cycle. The most recent negative buck duty cycle is determined as the negative buck duty cycle.

[0056] If the negative stability deviation value is not zero, it indicates that the voltage regulator is not outputting stably and accurately. In this case, it is necessary to adjust the operating state of the negative half-cycle buck regulator circuit. This involves feeding the obtained negative stability deviation value into a voltage loop PID controller. The PID controller will calculate an adjustment amount based on the magnitude, integral, and derivative of the error, i.e., the negative buck duty cycle adjustment amount. Then, the sum of the most recent negative buck duty cycle obtained above and this negative buck duty cycle adjustment amount is taken as the negative buck duty cycle. In this way, by inputting the AC current cycle, the positive or negative buck duty cycle can be controlled in real time to complete the voltage conversion more quickly and accurately.

[0057] The output voltage merging circuit is connected to the positive and negative half-cycle buck regulator circuit to integrate the preset actual positive electrical signal and the preset actual negative electrical signal to obtain a regulated electrical signal.

[0058] The output voltage combining circuit includes a fifth capacitor, C5. The positive terminal of the third capacitor, C3, and the negative terminal of the fourth capacitor, C4, are connected to the first terminal of the fifth capacitor, C5. The second terminal of the fifth capacitor, C5, is grounded, and the first terminal of C5 outputs a stable electrical signal. The output voltage combining circuit combines the positive and negative half-cycle voltages into a complete sinusoidal AC wave. This voltage regulator employs a small size and low cost architecture, eliminating the need for a complex bipolar converter architecture. By controlling the corresponding duty cycle, it can respond quickly and accurately to fluctuations in the mains voltage with a small size and low cost.

[0059] Figure 3 This is a block diagram of a control method for a voltage regulator based on voltage conversion, as provided in this application. The control method for the voltage regulator based on voltage conversion uses the aforementioned voltage regulator. Figure 3 As shown, a control method for a voltage regulator based on voltage conversion includes the following steps: Step S100: Receive input AC power and obtain boost duty cycle; control the PFC chopper boost circuit to process the working state of the input AC power based on the boost duty cycle to obtain a high-voltage chopped AC signal, wherein the high-voltage chopped AC signal includes a positive high-voltage chopped AC signal and a negative high-voltage chopped AC signal.

[0060] Step S200: Rectify and filter the positive high-voltage chopper AC signal and the negative high-voltage chopper AC signal respectively to obtain the positive regulated chopper AC signal and the negative regulated chopper AC signal.

[0061] Step S300: Obtain the buck duty cycle, and control the working state of the positive and negative half-cycle buck regulator circuit to process the positive and negative regulated AC signals based on the buck duty cycle, so as to obtain the preset actual positive signal and the preset actual negative signal.

[0062] Step S400: Integrate the preset actual positive electrical signal and the preset actual negative electrical signal to obtain a regulated electrical signal.

[0063] In addition, the boost duty cycle includes positive and negative boost duty cycles. Obtaining the boost duty cycle involves: acquiring the most recent output voltage and a preset boost value from the PFC chopper boost circuit; determining the voltage deviation based on the preset boost value and the most recent output voltage; processing the voltage deviation using a PID controller to obtain the duty cycle adjustment amount; acquiring the electrical signal sign based on the input AC current; and obtaining the most recent boost duty cycle corresponding to the electrical signal sign. If the electrical signal sign is positive, the most recent boost duty cycle is added to the duty cycle adjustment amount to obtain a positive boost duty cycle. If the electrical signal sign is negative, the most recent boost duty cycle is added to the duty cycle adjustment amount to obtain a negative boost duty cycle.

[0064] The control method of the voltage conversion-based regulator described above is based on the regulator architecture described above. The other functions performed and the technical details of each function are the same as or similar to the corresponding features in the voltage conversion-based regulator described above, so they will not be repeated here.

[0065] This application also provides a computer storage medium storing a computer program that, when run on a computer, enables the computer to execute the steps in the control method for a voltage converter based on voltage conversion described above.

[0066] It should be understood that although the steps in the flowcharts in the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily performed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order requirement for the execution of these steps, and they can be performed in other orders.

[0067] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A voltage regulator based on voltage conversion, characterized in that, include: A PFC chopper boost circuit is used to receive input AC power and obtain the boost duty cycle used to control the controllable switch in the PFC chopper boost circuit. Based on the boost duty cycle, the input AC power is chopper boosted to output a high-voltage chopped AC signal. The positive and negative half-cycle filtering circuit is connected to the output terminal of the PFC chopper boost circuit. It is used to rectify and filter the positive high-voltage chopper AC signal and the negative high-voltage chopper AC signal respectively to obtain the positive regulated chopper AC signal and the negative regulated chopper AC signal. A positive and negative half-cycle step-down voltage regulator circuit is connected to the output terminal of the positive and negative half-cycle filter circuit. It is used to receive the step-down duty cycle and perform step-down voltage regulation on the positive regulated chopper AC signal and the negative regulated chopper AC signal based on the step-down duty cycle to obtain a preset actual positive electrical signal and a preset actual negative electrical signal. The output voltage merging circuit is connected to the positive and negative half-cycle buck regulator circuit to integrate the preset actual positive electrical signal and the preset actual negative electrical signal to obtain a regulated electrical signal.

2. The voltage regulator according to claim 1, characterized in that, The PFC chopper boost circuit includes a first inductor, a first N-type IGBT, and a second N-type IGBT, wherein... The input terminal of the first inductor receives the input AC power, the output terminal of the first inductor is connected to the emitter of the second N-type IGBT, the collector of the second N-type IGBT is connected to the collector of the first N-type IGBT, and the emitter of the first N-type IGBT is connected to the neutral wire. The gates of the first N-type IGBT and the second N-type IGBT receive the boost duty cycle to boost the input AC power, so as to output a high-voltage chopped AC signal through the output terminal of the first inductor.

3. The voltage regulator according to claim 2, characterized in that, The boost duty cycle includes a positive boost duty cycle and a negative boost duty cycle. Obtaining the boost duty cycle used to control the controllable switch in the PFC chopper boost circuit includes: Obtain the most recent output voltage and the preset boost value in the PFC chopper boost circuit, and determine the voltage deviation based on the preset boost value and the most recent output voltage; The voltage deviation is processed using a PID controller to obtain the duty cycle adjustment. Based on the input AC power, obtain the electrical signal symbol and the most recent boost duty cycle corresponding to the electrical signal symbol; If the electrical signal sign is positive, add the duty cycle adjustment amount to the most recent boost duty cycle to obtain a positive boost duty cycle; If the electrical signal sign is negative, the most recent boost duty cycle is added to the duty cycle adjustment amount to obtain a negative boost duty cycle.

4. The voltage regulator according to claim 2, characterized in that, The positive and negative half-cycle filter circuit includes a positive half-cycle filter circuit and a negative half-cycle filter circuit, wherein, The positive half-cycle filter circuit includes a first diode and a first capacitor, and the negative half-cycle filter circuit includes a second diode and a second capacitor. The anode of the first diode is connected to the output terminal of the first inductor to receive a positive high voltage chop AC signal. The cathode of the first diode is connected to the positive terminal of the first capacitor. The negative terminal of the first capacitor is grounded. The positive terminal of the first capacitor outputs a positive regulated chop AC signal. The cathode of the second diode is connected to the output terminal of the first inductor to receive the negative high-voltage chopped AC signal. The anode of the second diode is connected to the negative terminal of the second capacitor. The positive terminal of the second capacitor is grounded. The negative terminal of the second capacitor outputs a negative regulated chopped AC signal.

5. The voltage regulator according to claim 4, characterized in that, The positive and negative half-cycle buck regulator circuit includes a positive half-cycle buck regulator circuit and a negative half-cycle buck regulator circuit, and the buck duty cycle includes a positive buck duty cycle and a negative buck duty cycle, wherein... The positive half-cycle buck regulator circuit includes a third N-type IGBT, a second inductor, a third diode, and a third capacitor; the negative half-cycle buck regulator circuit includes a fourth N-type IGBT, a third inductor, a fourth diode, and a fourth capacitor. The collector of the third N-type IGBT is connected to the positive terminal of the first capacitor to receive a positive regulated chopper AC signal. The gate of the third N-type IGBT receives a positive buck duty cycle. The emitter of the third N-type IGBT is connected to the cathode of the third diode and one end of the second inductor. The anode of the third diode is grounded. The other end of the second inductor is connected to the positive terminal of the third capacitor. The negative terminal of the third capacitor is grounded. The positive terminal of the third capacitor outputs a preset actual positive electrical signal. The emitter of the fourth N-type IGBT is connected to the negative terminal of the second capacitor to receive a negative regulated chopper AC signal. The gate of the fourth N-type IGBT receives a negative step-down duty cycle. The collector of the fourth N-type IGBT is connected to the anode of the fourth diode and one end of the third inductor. The cathode of the fourth diode is grounded. The other end of the third inductor is connected to the negative terminal of the fourth capacitor. The positive terminal of the fourth capacitor is grounded. The negative terminal of the fourth capacitor outputs a preset actual negative electrical signal.

6. The voltage regulator according to claim 5, characterized in that, The step-down duty cycle includes a positive step-down duty cycle and a negative step-down duty cycle, and the receiving step-down duty cycle includes: Obtain the preset voltage value; If the electrical signal is positive, obtain the most recent actual positive voltage regulation value and the most recent positive buck duty cycle of the most recent output in the positive half-cycle buck regulator circuit, and determine the positive voltage regulation deviation value based on the most recent preset actual positive electrical signal and the preset voltage value; If the positive voltage regulation deviation is zero, the most recent positive buck duty cycle will be taken as the positive buck duty cycle; If the positive voltage regulation deviation value is not zero, the positive voltage regulation deviation value is processed by the PID controller to obtain the positive buck duty cycle adjustment amount, and the most recent positive buck duty cycle is added to the positive buck duty cycle adjustment amount to obtain the positive buck duty cycle; If the electrical signal is negative, obtain the most recent actual negative voltage regulation value and the most recent negative voltage buck duty cycle of the most recent output in the negative half-cycle buck voltage regulation circuit, and determine the negative voltage regulation deviation value based on the most recent preset actual negative electrical signal and the preset voltage value. If the negative voltage regulation deviation value is zero, the most recent negative voltage drop duty cycle shall be taken as the negative voltage drop duty cycle; If the negative voltage regulation deviation value is not zero, the negative voltage regulation deviation value is processed by the PID controller to obtain the negative buck duty cycle adjustment amount, and the most recent negative buck duty cycle is added to the negative buck duty cycle adjustment amount to obtain the negative buck duty cycle.

7. The voltage regulator according to claim 5, characterized in that, The output voltage combining circuit includes a fifth capacitor, wherein... The positive terminal of the third capacitor and the negative terminal of the fourth capacitor are connected to the first terminal of the fifth capacitor. The second terminal of the fifth capacitor is grounded, and the first terminal of the fifth capacitor outputs a regulated electrical signal.

8. A control method for a voltage regulator based on voltage conversion, characterized in that, Using the voltage regulator as described in any one of claims 1 to 7, the method comprises: The circuit receives input AC power and acquires the boost duty cycle. Based on the boost duty cycle, it controls the operating state of the PFC chopper boost circuit to process the input AC power to obtain a high-voltage chopped AC signal. The high-voltage chopped AC signal includes a positive high-voltage chopped AC signal and a negative high-voltage chopped AC signal. The positive high-voltage chopped AC signal and the negative high-voltage chopped AC signal are rectified and filtered respectively to obtain the positive regulated chopped AC signal and the negative regulated chopped AC signal; Obtain the buck duty cycle, and control the working state of the positive and negative half-cycle buck regulator circuit to process the positive and negative regulated AC signals based on the buck duty cycle, so as to obtain the preset actual positive signal and the preset actual negative signal. The preset actual positive electrical signal and the preset actual negative electrical signal are integrated to obtain a regulated electrical signal.

9. The method according to claim 8, characterized in that, The boost duty cycle includes a positive boost duty cycle and a negative boost duty cycle, and obtaining the boost duty cycle includes: Obtain the most recent output voltage and the preset boost value in the PFC chopper boost circuit, and determine the voltage deviation based on the preset boost value and the most recent output voltage; The voltage deviation is processed using a PID controller to obtain the duty cycle adjustment. Based on the input AC power, obtain the electrical signal symbol and the most recent boost duty cycle corresponding to the electrical signal symbol; If the electrical signal sign is positive, add the duty cycle adjustment amount to the most recent boost duty cycle to obtain a positive boost duty cycle; If the electrical signal sign is negative, the most recent boost duty cycle is added to the duty cycle adjustment amount to obtain a negative boost duty cycle.

10. A computer-readable storage medium having a computer program stored thereon that can run on a processor, characterized in that, When the computer program is executed by the processor, it implements a control method for a voltage conversion-based regulator as described in any one of claims 8 to 9.

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