AC-AC voltage regulating system based on chopper circuit

Abstract

The utility model relates to an AC-AC voltage regulation system based on a chopper circuit, comprising a chopper circuit, the input end of which is used for inputting a voltage to be regulated, and the chopper circuit carries out voltage regulation processing on the voltage to be regulated according to a control signal to obtain an initial regulation voltage; the filter circuit is connected with the chopper circuit and is used for filtering the initial regulation voltage to obtain a target output voltage; the sampling circuit is connected with the filter circuit and is used for collecting the voltage value of the target output voltage; and the control module is respectively connected with the chopper circuit and the sampling circuit, and the control module generates a control signal according to a difference value between the voltage value of the target output voltage and a preset voltage value, so that the chopper circuit executes a voltage regulation action according to the control signal. Therefore, the problems of complex structure, low circuit efficiency, poor stability and the like of an alternating-current voltage regulating system in the prior art are solved, the circuit structure is simplified, the circuit efficiency is improved, and the circuit stability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hardware circuits, in particular to an AC-AC voltage regulation system based on a chopper circuit. Background Art

[0002] The voltage regulation system is an important component of the power system. It is used in many industries such as industrial production and new energy vehicles and has a wide range of applications.

[0003] In the related art, a high-frequency chopping method is used to reduce a higher input AC voltage to a lower output AC voltage, and a subsequent filtering circuit is used to reduce the high-frequency harmonic components in the circuit.

[0004] However, the output voltage adjustment range of the AC chopper system in related technologies is limited and unstable, and the load regulation rate and circuit efficiency are low, which affects the stability and practicality in actual applications and needs to be solved urgently. Utility Model Content

[0005] This utility model provides an AC-AC voltage regulation system based on a chopper circuit to solve the problems of complex structure, low circuit efficiency, and poor stability of traditional AC voltage regulation systems. It simplifies the circuit structure, improves circuit efficiency, and enhances circuit stability.

[0006] The utility model provides an AC-AC voltage regulation system based on a chopper circuit, comprising: a chopper circuit, wherein an input end of the chopper circuit is used to input a voltage to be regulated, and the chopper circuit performs voltage regulation processing on the voltage to be regulated according to a control signal to obtain an initial regulated voltage; a filter circuit, which is connected to the chopper circuit and is used to perform filtering processing on the initial regulated voltage to obtain a target output voltage; a sampling circuit, which is connected to the filter circuit and is used to collect the voltage value of the target output voltage; and a control module, which is respectively connected to the chopper circuit and the sampling circuit, and generates the control signal according to the difference between the voltage value of the target output voltage and a preset voltage value, so that the chopper circuit performs a voltage regulation action according to the control signal.

[0007] Furthermore, the chopper circuit includes: a first MOS transistor, wherein the gate of the first MOS transistor is connected to the control module, and the drain of the first MOS transistor is connected to one end of the AC power input device; a second MOS transistor, wherein the gate of the second MOS transistor is connected to the control module, and the drain of the second MOS transistor is connected to the source of the first MOS transistor; a third MOS transistor, wherein the gate of the third MOS transistor is connected to the control module, the source of the third MOS transistor is connected to the source of the second MOS transistor, and the drain of the third MOS transistor is connected to the filter circuit; and a fourth MOS transistor, wherein the gate of the fourth MOS transistor is connected to the control module, the drain of the fourth MOS transistor is connected to the other end of the AC power input device, and the source of the fourth MOS transistor is respectively connected to the drain of the third MOS transistor and the filter circuit.

[0008] Furthermore, the filtering circuit includes: a first inductor, one end of the first inductor being respectively connected to the source of the fourth MOS transistor and the drain of the third MOS transistor, and the other end of the first inductor being connected to the sampling circuit; a second inductor, one end of the second inductor being respectively connected to the source of the first MOS transistor and the drain of the second MOS transistor, and the other end of the second inductor being connected to the sampling circuit; and a capacitor, one end of the capacitor being connected to the other end of the first inductor, and the other end of the capacitor being connected to the other end of the second inductor.

[0009] Furthermore, the sampling circuit includes: an intersensory module and a data acquisition system, wherein the intersensory module, the input end of the intersensory module is connected to the filtering circuit, and the intersensory module is used to process the voltage value of the target output voltage and the output current value of the filtering circuit based on the sampling requirements of the data acquisition system; the input end of the data acquisition system is connected to the intersensory module, and the output end of the data acquisition system is connected to the control module, and the data acquisition system is used to collect the voltage value of the target output voltage and the output current value of the filtering circuit, wherein the control module generates a protection signal when the absolute value of the difference between the output current value of the filtering circuit and the preset current value is greater than a preset threshold.

[0010] Furthermore, the mutual inductance module includes: a current sampling module, which is connected to the current output end of the filter circuit and is used to generate a mutual inductance current corresponding to the output current of the filter circuit based on the sampling requirements of the data acquisition system; and a voltage sampling module, which is connected to the voltage output end of the filter circuit and is used to generate an AC voltage corresponding to the target output voltage based on the sampling requirements of the data acquisition system.

[0011] Furthermore, the data acquisition system adopts ADS8688 chip.

[0012] Furthermore, the AC-AC voltage regulation system based on the chopper circuit also includes: a rectifier module, the input end of the rectifier module is connected to the AC current output end of the AC input device; a power supply module, the input end of the power supply module is connected to the output end of the rectifier module, and the output end of the power supply module is respectively connected to the chopper circuit, the control module, the intersensory module and the data acquisition system to respectively power the chopper circuit, the control module, the intersensory module and the data acquisition system.

[0013] Furthermore, the AC-AC voltage regulation system based on the chopper circuit also includes: an alarm module, which is connected to the control module, and the alarm module issues an alarm reminder when the absolute value of the difference between the output current value of the filter circuit and the preset current value is greater than the preset threshold.

[0014] Furthermore, the alarm module includes: an acoustic alarm unit, which is connected to the control module, and performs an acoustic alarm reminder when the absolute value of the difference between the output current value of the filter circuit and the preset current value is greater than the preset threshold value; and / or an optical alarm unit, which is connected to the control module, and performs an optical alarm reminder when the absolute value of the difference between the output current value of the filter circuit and the preset current value is greater than the preset threshold value.

[0015] Furthermore, the AC-AC voltage regulation system based on the chopper circuit also includes: a display module, which is connected to the control module and is used to display the voltage value of the target output voltage, the preset voltage value, the output current value of the filter circuit and the preset current value.

[0016] The chopper-circuit-based AC-AC voltage regulation system provided by the utility model achieves voltage regulation by using a single-chip microcomputer to output a control signal (i.e., a PWM wave) via a PID algorithm. Thyristor devices control the on / off switching of the circuit to achieve this. This solves the problems of traditional AC voltage regulation systems, such as complex structure, low circuit efficiency, and poor stability, by simplifying the circuit structure, improving circuit efficiency, and enhancing circuit stability.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1 Schematic diagram of a block diagram of an AC-AC voltage regulation system based on a chopper circuit according to an embodiment of the present invention;

[0020] Figure 2 A block diagram of an AC-AC voltage regulation system based on a chopper circuit according to an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of a chopper circuit topology according to an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of a half-bridge module circuit provided according to an embodiment of the present utility model;

[0023] Figure 5 Schematic diagram of an isolation drive circuit according to one embodiment of the present utility model;

[0024] Figure 6 is a schematic diagram of chopping voltage characteristics according to an embodiment of the present utility model;

[0025] Figure 7 A schematic diagram of an ADS8688 chip module circuit according to one embodiment of the present invention;

[0026] Figure 8 The figure is a circuit diagram of an auxiliary power module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] The following describes an AC-AC voltage regulation system based on a chopper circuit according to an embodiment of the present invention, with reference to the accompanying drawings. To address the issues mentioned in the background art regarding the limited and unstable output voltage regulation range of the AC chopper systems mentioned above, as well as their low load regulation and circuit efficiency, which affect stability and practicality in practical applications, the present invention provides an AC-AC voltage regulation system based on a chopper circuit. This system achieves voltage regulation by outputting a control signal (i.e., a PWM wave) via a single-chip microcomputer using a PID algorithm. The system then controls the conduction and shutdown of the circuit using thyristor devices. This solves the problems of complex circuit structure, low circuit efficiency, and poor stability.

[0029] First, combine Figure 1 An AC-AC voltage regulation system based on a chopper circuit according to an embodiment of the present utility model is introduced.

[0030] Specifically, Figure 1 A block diagram of an AC-AC voltage regulation system based on a chopper circuit provided by an embodiment of the present utility model.

[0031] like Figure 1 As shown, the AC-AC voltage regulation system 10 based on the chopper circuit includes: a chopper circuit 100 , a filter circuit 200 , a sampling circuit 300 and a control module 400 .

[0032] Among them, the input end of the chopping circuit 100 is used to input the voltage to be adjusted, and the chopping circuit 100 adjusts the voltage to be adjusted according to the control signal to obtain an initial adjustment voltage; the filtering circuit 200 is connected to the chopping circuit 100, and is used to filter the initial adjustment voltage to obtain a target output voltage; the sampling circuit 300 is connected to the filtering circuit 200, and is used to collect the voltage value of the target output voltage; the control module 400 is respectively connected to the chopping circuit 100 and the sampling circuit 300, and the control module 400 generates a control signal according to the difference between the voltage value of the target output voltage and the preset voltage value, so that the chopping circuit 100 performs a voltage adjustment action according to the control signal.

[0033] Specifically, in the chopper circuit 100, the embodiment of the present invention can use thyristor devices to control the conduction and shutdown of the circuit. These devices can be turned on and off respectively in the positive and negative half cycles of the alternating current. Using a single-chip microcomputer, a PID algorithm outputs a control signal, that is, in the form of a PWM wave, to control the conduction and shutdown of the four thyristor devices, thereby controlling the waveform of the alternating current and achieving the purpose of voltage regulation. The filter circuit 200 can be composed of an inductor and a capacitor to form a low-pass filter to filter out clutter and noise in the current. The sampling circuit 300 is divided into an intersensory module (current, voltage transformer chip and operational amplifier) ​​and a sampling chip module, which converts the output current and voltage of the main circuit into digital signals that can be read by the single-chip microcomputer. The control module 400 serves as a DC power supply for the drive in the system, including +5V, -5V auxiliary power supplies and a +12V isolated power supply.

[0034] To improve circuit efficiency, the design can be divided into three aspects. First, select an appropriate switching frequency. A lower switching frequency requires a larger inductor, which increases the circuit size and core losses. Higher switching frequencies also increase the losses of the switch transistor. Therefore, considering all factors, a switching frequency of 20kHz is recommended. Second, select a switch transistor with low gate capacitance and low on-resistance. Reducing the gate series resistance of the switch transistor can control the timing of the pulse rise and fall, prevent oscillation, and reduce the drain surge voltage of the switch transistor. Furthermore, connecting a larger protection resistor in parallel between the gate and source of the switch transistor can reduce the quiescent current when the switch transistor is off. In summary, the CSD19536 is a good choice for the switch transistor. Finally, select an appropriate inductor and capacitor. Select a high-resistivity core and improve the winding process to reduce inductor losses. Multiple filter capacitors should be connected in parallel to reduce the equivalent series resistance.

[0035] To facilitate those skilled in the art to further understand the AC-AC voltage regulation system 10 based on the chopper circuit according to the embodiment of the present invention, a detailed description will be given below in conjunction with specific embodiments.

[0036] in, Figure 2 FIG1 is a block diagram of an AC-AC voltage regulation system based on a chopper circuit according to an embodiment of the present invention. Figure 3 A schematic diagram of a chopper circuit topology according to a novel embodiment of the present invention is shown in FIG. Figure 4 The figure is a schematic diagram of a half-bridge module circuit provided according to one embodiment of the present invention.

[0037] First, combine Figure 2 and Figure 3 The chopper circuit 100 will be described in detail.

[0038] As a possible way to achieve this, Figure 2 and Figure 3As shown, in some embodiments, the chopper circuit 100 includes: a first MOS transistor 101, a second MOS transistor 102, a third MOS transistor 103, and a fourth MOS transistor 104. The gate of the first MOS transistor 101 is connected to the control module 400, and the drain of the first MOS transistor 101 is connected to one end of an AC power input device; the gate of the second MOS transistor 102 is connected to the control module 400, and the drain of the second MOS transistor is connected to the source of the first MOS transistor 101; the gate of the third MOS transistor 103 is connected to the control module 400, the source of the third MOS transistor 103 is connected to the source of the second MOS transistor 102, and the drain of the third MOS transistor 103 is connected to the filter circuit 200; the gate of the fourth MOS transistor 104 is connected to the control module 400, the drain of the fourth MOS transistor 104 is connected to the other end of the AC power input device, and the source of the fourth MOS transistor 104 is connected to the drain of the third MOS transistor 103 and the filter circuit 200, respectively.

[0039] Specifically, the chopper circuit 100 of the embodiment of the present invention can be composed of a first MOS transistor 101 and a fourth MOS transistor 104 to form a chopper circuit, and a second MOS transistor 102 and a fourth MOS transistor 104 to form a freewheeling circuit. The thyristors are controlled by a single-chip microcomputer outputting a PWM mode, so that the first MOS transistor 101 and the fourth MOS transistor 104 are switched on and off multiple times during the positive and negative half-cycles of the input AC. The second MOS transistor 102 and the third MOS transistor 103 provide a freewheeling circuit for the load during the off periods of the first MOS transistor 101 and the fourth MOS transistor 104, respectively. In an actual design, the complementary first MOS transistor 101 and the second MOS transistor 102 are combined to form a half-bridge module.

[0040] Specifically, combined Figure 3 and Figure 4 Schematic diagram of a half-bridge module circuit for a chopper circuit. During a sinusoidal cycle of an AC voltage, during the positive half-cycle of the sinusoidal cycle, the fourth MOS transistor 104 is turned on and the third MOS transistor 103 is turned off, achieving energy transfer. When the fourth MOS transistor 104 is turned off and the third MOS transistor 103 is turned on, achieving freewheeling. During the negative half-cycle of the sinusoidal cycle of an AC voltage, the first MOS transistor 101 is turned on and the second MOS transistor 102 is turned off, achieving energy transfer. When the first MOS transistor 101 is turned off and the second MOS transistor 102 is turned on, achieving freewheeling. The diode protects the device from reverse voltage.

[0041] Furthermore, in some embodiments, Figure 5 As shown, Figure 5This is a schematic diagram of an isolated drive circuit according to one embodiment of the present invention. Since the MOS transistor only conducts when there is a 12V potential difference between the gate and source, the sources of the two half-bridges in the AC circuit are isolated from the ground formed by the AC rectification, and the ground of the half-bridge drive circuit is also disconnected from the digital ground. Therefore, an isolated power supply B1212S-2W is required to ensure that the half-bridge driver chip UCC74211 can properly generate the level signal that controls the switching transistor. Since the UCC27211 and the single-chip microcomputer do not share a common ground, and to avoid mixing the DC circuit with the AC circuit, which would cause backflow and affect system stability, an isolated driver chip ISO7760 is also required to ensure that the STM32 control signal properly controls the UCC27211. Due to the presence of the MOS transistor bootstrap diode, the sources of the four MOS transistors can share a common analog ground. Therefore, only an isolated power supply B1212S-2W and an isolated driver chip ISO7760 are required to ensure normal and safe control of the chopper circuit.

[0042] Furthermore, if Figure 6 As shown, Figure 6 This is a schematic diagram of the chopping voltage characteristics of a specific embodiment of the utility model. Figure 6 In the example, the switch control input, as indicated by signal G, ensures that the output voltage contains only the fundamental and higher harmonic components, eliminating lower harmonics. The subsequent LC filtering circuit produces an output voltage with adjusted amplitude. In actual wiring, complementary PWM signals are input to the two MOSFETs in the same half-bridge module, with an appropriate dead time (approximately 200ns) to prevent all MOSFETs from turning on simultaneously, causing a short circuit.

[0043] Next, the filter circuit 200 is described in detail with reference to a specific embodiment. The filter circuit 200 includes: a first inductor 201, a second inductor 202, and a capacitor 203. One end of the first inductor 201 is connected to the source of the fourth MOS transistor 104 and the drain of the third MOS transistor 103, respectively, and the other end of the first inductor 201 is connected to the sampling circuit 300. One end of the second inductor 202 is connected to the source of the first MOS transistor 101 and the drain of the second MOS transistor 102, respectively, and the other end of the second inductor 202 is connected to the sampling circuit 300. One end of the capacitor 203 is connected to the other end of the first inductor 201, and the other end of the capacitor 203 is connected to the other end of the second inductor 202.

[0044] The LC filter circuit composed of the first inductor 201, the second inductor 202 and the capacitor 203 is a low-voltage filter circuit, which is used to remove clutter and excess noise in the circuit and provide a more stable power supply for the system.

[0045] Again, the sampling circuit 300 is described in detail in conjunction with a specific embodiment, wherein the sampling circuit 300 includes: an intersensor module 301 and a data acquisition system 302, wherein the input end of the intersensor module 301 is connected to the filter circuit 200, and the intersensor module 301 is used to process the voltage value of the target output voltage and the output current value of the filter circuit 200 based on the sampling requirements of the data acquisition system 302; the input end of the data acquisition system 302 is connected to the intersensor module 301, and the output end of the data acquisition system 302 is connected to the control module 400, and the data acquisition system 302 is used to collect the voltage value of the target output voltage and the output current value of the filter circuit 200, wherein the control module 400 generates a protection signal when the absolute value of the difference between the output current value of the filter circuit 200 and the preset current value is greater than a preset threshold.

[0046] Furthermore, in some embodiments, the mutual inductance module 301 includes: a current sampling module, which is connected to the current output end of the filter circuit 200 and is used to generate a mutual inductance current corresponding to the output current of the filter circuit 200 based on the sampling requirements of the data acquisition system 302; and a voltage sampling module, which is connected to the voltage output end of the filter circuit 200 and is used to generate an AC voltage corresponding to the target output voltage based on the sampling requirements of the data acquisition system 302.

[0047] Optionally, the data acquisition system 302 of the embodiment of the present invention may use the ADS8688 chip. The mutual induction module 301 of the embodiment of the present invention may be composed of TA1015, TV1013, and OPA2197. During the operation of the voltage regulation system, current sampling: TA1015 is connected in series with the main line, and a linearly related mutual induction current is generated in the sampling module through the mutual induction coil. This current is converted into an AC voltage linearly related to the main line current through OPA2227. Voltage sampling: TV1013 is connected in parallel with the main line, first converting the main line voltage into current, and then generating a mutual induction current linearly related to the original voltage in the sampling module through the mutual induction coil. This current is converted into an AC voltage linearly related to the main line voltage through OPA2227. The two sampled voltages are then transmitted to the ADS8688 module for sampling.

[0048] Specifically, if Figure 7 As shown, Figure 7 This is a circuit diagram of the ADS8688 chip module provided by one embodiment of the present invention. After passing through the sympathetic module, AC voltage is fed into the 16-bit, 500kHz sampling rate, 8-channel ADS8688 chip. The ADS8688 is powered by a 5V auxiliary power supply. The ADS8688 and STM32 communicate via SPI.

[0049] Furthermore, in some embodiments, the AC-AC voltage regulation system 10 based on the chopper circuit further includes: a rectifier module 500 and a power supply module 600, wherein the input end of the rectifier module 500 is connected to the AC current output end of the AC input device; the input end of the power supply module 600 is connected to the output end of the rectifier module 500, and the output end of the power supply module 600 is respectively connected to the chopper circuit 100, the control module 400, the intersensory module 301 and the data acquisition system 302, so as to respectively power the chopper circuit 100, the control module 400, the intersensory module 301 and the data acquisition system 302.

[0050] Finally, the control module 400 of the present invention is described in conjunction with a specific embodiment. It should be noted that since the voltage of the input AC power after full-bridge rectification may not reach the driving threshold and fail, the embodiment of the present invention can add an auxiliary power supply module (i.e., power supply module 600) after the rectification process. Figure 8 This is a schematic diagram of an auxiliary power supply module circuit according to an embodiment of the present invention.

[0051] like Figure 8 As shown in the figure, the auxiliary power supply module uses LM5164 and LM2663 voltage regulator chips. The input AC power is rectified by a full-bridge and then passes through the voltage regulator chip to obtain 12V and ±5V power supplies for driving the MOSfet, microcontroller and sampling module.

[0052] As a possible implementation, the control module 400 is centered around a single-chip microcomputer (STM32f407zgt6). Users can set the output voltage via a peripheral matrix keyboard and view the preset output voltage, along with sampled output current and voltage, on the peripheral LCD. The MCU uses the preset and sampled voltages to update the PWM signal parameters controlling the MOSFET in real time using a PID algorithm to regulate and stabilize the voltage. Simultaneously, based on the sampled current, the MCU determines whether the sampled current is excessive and, if so, activates the protection circuit.

[0053] In order to more clearly demonstrate the technical effects of the embodiments of the present utility model, the technical effects of the AC-AC voltage regulation system based on the chopper circuit will be demonstrated in detail below in combination with specific test results.

[0054] Among them, Table 1 is the voltage stabilization test table of the AC-AC voltage regulation system based on the chopper circuit (R L =20Ω), Table 2 is the load regulation test table of the AC-AC voltage regulation system based on the chopper circuit, and Table 3 is the efficiency test table of the AC-AC voltage regulation system based on the chopper circuit. The load is 20Ω.

[0055] Table 1

[0056]

[0057] Table 2

[0058]

[0059] Table 3

[0060] Input voltage Input current Output voltage Output current efficiency 36.1662 1.7881 30 2 92.78％

[0061] Specifically, when the input voltage is 36V and the load is 20Ω, the output voltage can be set in the range of 1V to 35V through the keyboard, and the setting can be achieved in steps of 0.5V. When the input voltage is 36V and the output voltage is set to 30V, the load regulation rate S is 0.1 when the output current changes within a certain range. i =0.33%; when the input voltage is 36V RMS, the output voltage is 30V RMS, and the output current is 2A RMS, the efficiency of the AC-AC conversion circuit is 92.78%, which can better realize the design function of chopping voltage regulation.

[0062] Thus, the single-chip microcomputer outputs a control signal (PWM wave) through a PID algorithm, and the thyristor device controls the on and off of the circuit to achieve the purpose of voltage regulation. This solves the problems of traditional AC voltage regulation systems such as complex structure, low circuit efficiency, and poor stability, simplifies the circuit structure, improves circuit efficiency, and enhances circuit stability.

[0063] Furthermore, in some embodiments, the AC-AC voltage regulation system based on the chopper circuit further includes: an alarm module 700, which is connected to the control module 400, and the alarm module 700 issues an alarm reminder when the absolute value of the difference between the output current value of the filter circuit 100 and the preset current value is greater than a preset threshold.

[0064] Among them, in some embodiments, the alarm module includes: an acoustic alarm unit 701, the acoustic alarm unit 701 is connected to the control module 400, and the acoustic alarm unit 701 performs an acoustic alarm reminder when the absolute value of the difference between the output current value of the filter circuit 100 and the preset current value is greater than a preset threshold; and / or, an optical alarm unit 702, the optical alarm unit 702 is connected to the control module 400, and the optical alarm unit 702 performs an optical alarm reminder when the absolute value of the difference between the output current value of the filter circuit 100 and the preset current value is greater than a preset threshold.

[0065] Optionally, the acoustic alarm unit 701 may be a buzzer, and the optical alarm unit 702 may be an LED light. For example, when the absolute value of the difference between the output current value of the filter circuit 100 and the preset current value is greater than a preset threshold, an acoustic alarm reminder is performed, and the buzzer sounds and an alarm reminder is performed. For another example, when the absolute value of the difference between the output current value of the filter circuit 100 and the preset current value is greater than a preset threshold, an optical alarm reminder is performed, and the LED light lights up and flashes, and an optical alarm is performed. Alternatively, when the absolute value of the difference between the output current value of the filter circuit 100 and the preset current value is greater than a preset threshold, an acoustic alarm reminder and an optical alarm reminder are performed simultaneously, and the buzzer sounds and the LED light lights up and flashes, and an alarm is performed simultaneously.

[0066] Furthermore, in some embodiments, the AC-AC voltage regulation system based on the chopper circuit further includes: a display module 800, which is connected to the control module 400 and is used to display the voltage value of the target output voltage, the preset voltage value, the output current value of the filter circuit, and the preset current value.

[0067] The display module 800 is connected to the control module 400 via a data transmission line. The display module 800 can be displayed and operated using an LCD touch screen. A technician can use the touch screen to switch the display interface to view various parameters of the AC-AC voltage regulation system based on the chopper circuit 100. The AC-AC voltage regulation system based on the chopper circuit provided by the present invention achieves voltage regulation by outputting a control signal (i.e., a PWM wave) via a single-chip microcomputer using a PID algorithm. The thyristor device controls the on and off of the circuit to achieve voltage regulation. This solves the problems of complex structure, low circuit efficiency, and poor stability of traditional AC voltage regulation systems, simplifies the circuit structure, improves circuit efficiency, and enhances circuit stability.

[0068] It should be noted that the scope of protection of this utility model is not limited to the design of a chopper voltage regulation system with fixed components. By changing the types of corresponding components, more requirements can be met. Obviously, those skilled in the art can replace the types of certain components and modify the circuits of this utility model without departing from the scope and spirit of this utility model. If such modifications and variations fall within the scope of the utility model claims and their equivalents, the utility model is intended to include such modifications and variations.

[0069] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0071] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "N" means at least two, for example, two, three, etc., unless otherwise specifically defined.

Claims

1. An AC-AC voltage regulation system based on a chopper circuit, characterized in that: include: a chopper circuit, wherein an input terminal of the chopper circuit is used to input a voltage to be adjusted, and the chopper circuit performs voltage regulation on the voltage to be adjusted according to a control signal to obtain an initial regulated voltage; a filter circuit, connected to the chopper circuit, configured to filter the initial adjustment voltage to obtain a target output voltage; a sampling circuit, the sampling circuit being connected to the filtering circuit and being configured to collect a voltage value of the target output voltage; A control module is connected to the chopping circuit and the sampling circuit respectively, and the control module generates the control signal according to the difference between the voltage value of the target output voltage and the preset voltage value, so that the chopping circuit performs the voltage regulation action according to the control signal.

2. The AC-AC voltage regulation system based on the chopper circuit according to claim 1, characterized in that: The chopper circuit comprises: a first MOS transistor, wherein a gate of the first MOS transistor is connected to the control module, and a drain of the first MOS transistor is connected to one end of an AC power input device; a second MOS transistor, wherein a gate of the second MOS transistor is connected to the control module, and a drain of the second MOS transistor is connected to a source of the first MOS transistor; a third MOS transistor, wherein the gate of the third MOS transistor is connected to the control module, the source of the third MOS transistor is connected to the source of the second MOS transistor, and the drain of the third MOS transistor is connected to the filter circuit; a fourth MOS transistor, wherein a gate of the fourth MOS transistor is connected to the control module, a drain of the fourth MOS transistor is connected to the other end of the AC power input device, and a source of the fourth MOS transistor is respectively connected to the drain of the third MOS transistor and the filter circuit.

3. The AC-AC voltage regulation system based on the chopper circuit according to claim 2, characterized in that: The filtering circuit comprises: a first inductor, one end of the first inductor being connected to the source of the fourth MOS transistor and the drain of the third MOS transistor respectively, and the other end of the first inductor being connected to the sampling circuit; a second inductor, one end of the second inductor being connected to the source of the first MOS transistor and the drain of the second MOS transistor respectively, and the other end of the second inductor being connected to the sampling circuit; A capacitor, one end of the capacitor is connected to the other end of the first inductor, and the other end of the capacitor is connected to the other end of the second inductor.

4. The AC-AC voltage regulation system based on a chopper circuit according to claim 3, characterized in that: The sampling circuit includes: an intersensory module and a data acquisition system, wherein: an intersensory module, wherein an input end of the intersensory module is connected to the filter circuit, and the intersensory module is used to process the voltage value of the target output voltage and the output current value of the filter circuit based on the sampling requirement of the data acquisition system; The input end of the data acquisition system is connected to the intersensory module, and the output end of the data acquisition system is connected to the control module. The data acquisition system is used to collect the voltage value of the target output voltage and the output current value of the filter circuit, wherein the control module generates a protection signal when the absolute value of the difference between the output current value of the filter circuit and the preset current value is greater than a preset threshold.

5. The AC-AC voltage regulation system based on the chopper circuit according to claim 4, characterized in that: The interaction module includes: a current sampling module connected to the current output terminal of the filter circuit and configured to generate a mutual inductance current corresponding to the output current of the filter circuit based on a sampling requirement of the data acquisition system; A voltage sampling module is connected to the voltage output terminal of the filter circuit and is used to generate an AC voltage corresponding to the target output voltage based on a sampling requirement of the data acquisition system.

6. The AC-AC voltage regulation system based on a chopper circuit according to claim 4, characterized in that: The data acquisition system adopts ADS8688 chip.

7. The AC-AC voltage regulation system based on a chopper circuit according to claim 4, characterized in that: Also includes: A rectifier module, wherein the input end of the rectifier module is connected to the AC current output end of the AC input device; A power supply module, wherein the input end of the power supply module is connected to the output end of the rectifier module, and the output end of the power supply module is respectively connected to the chopping circuit, the control module, the intersensory module and the data acquisition system to respectively power the chopping circuit, the control module, the intersensory module and the data acquisition system.

8. The AC-AC voltage regulation system based on a chopper circuit according to claim 1, characterized in that: Also includes: An alarm module is connected to the control module, and the alarm module issues an alarm when the absolute value of the difference between the output current value of the filter circuit and the preset current value is greater than a preset threshold.

9. The AC-AC voltage regulation system based on a chopper circuit according to claim 8, characterized in that: The alarm module comprises: an acoustic alarm unit connected to the control module, and configured to generate an acoustic alarm when the absolute value of the difference between the output current value of the filter circuit and a preset current value is greater than a preset threshold value; And / or, an optical alarm unit, the optical alarm unit is connected to the control module, and the optical alarm unit performs an optical alarm reminder when the absolute value of the difference between the output current value of the filter circuit and the preset current value is greater than the preset threshold.

10. The AC-AC voltage regulation system based on a chopper circuit according to claim 1, characterized in that: Also includes: A display module is connected to the control module and is used to display the voltage value of the target output voltage, the preset voltage value, the output current value of the filter circuit, and the preset current value.

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