An accurate control power regulator for inductive loads

Abstract

The utility model relates to the field of power electronics, concretely is a kind of inductive load's accurate control electric power regulator, including box, circuit board is arranged in the box, power regulation module, digital control module and hardware protection module are arranged on the circuit board, the power regulation module is connected with inductive load by hardware protection module, the power regulation module is also connected with digital control module. The utility model is lack of phase active freewheeling protection, load state is judged in real time by digital control module, need not hardware switching just can be in rectification and inverter mode between smooth transition, and accurately divide load work interval, continuous phase amplitude regulation, adapt to inductive load characteristic dynamic change;In input electrode wiring aspect, three input electrodes are not located in the same horizontal plane, avoid wiring confusion and crowded problem, enhance electrical safety and insulation performance, facilitate installation and maintenance.

Description

Technical Field

[0001] This utility model relates to the field of power electronics technology, and in particular to a precise control power regulator for inductive loads. Background Technology

[0002] Power regulators, as core equipment in industrial applications for controlling inductive loads (such as motors and transformers), directly impact system efficiency and reliability. With modern industry demanding higher levels of dynamic response accuracy, protection capabilities, and energy efficiency, existing technologies suffer from the following shortcomings in circuit design:

[0003] 1. Insufficient protection: When the input phase is lost, the back electromotive force of the inductive load will trigger the freewheeling thyristor TV7.

[0004] 2. The working mode is rigid. The rectification / inverter mode requires hardware switching and cannot be dynamically adjusted. The common fast demagnetization technology on the market adopts a passive method. When the voltage is low, the equipment is prone to enter the negative value region, which reduces the efficiency of the regulator. The passive method cannot accurately determine whether the load belongs to the rectification region or the discharge region.

[0005] 3. Inverter accuracy is limited; traditional inverter solutions have fixed output amplitude or a narrow adjustment range.

[0006] Furthermore, in the design of the power regulator's casing, the three input electrodes are located on the same horizontal plane and are close together. If there are multiple connecting wires, the wiring will be crowded, and there may be a problem that one connecting wire contacts two input electrodes, which will cause safety hazards in the wiring connection. When maintenance is required, the messy wiring will also make it inconvenient to disassemble and maintain.

[0007] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0008] In view of the above-mentioned defects, the purpose of this utility model is to provide a precise control power regulator for inductive loads.

[0009] To achieve the above objectives, this utility model provides a precise control power regulator for inductive loads, including a housing, a circuit board disposed inside the housing, a power regulation module, a digital control module and a hardware protection module disposed on the circuit board, the power regulation module being connected to an inductive load via the hardware protection module, and the power regulation module also being connected to the digital control module;

[0010] The power regulation module includes a thyristor rectifier bridge composed of three bidirectional thyristor groups and a freewheeling thyristor TV7; the hardware protection module includes a Zener diode U1, a series-connected diode D26 and a diode D25; the Zener diode U1 is connected in parallel between the cathode and the control electrode of the freewheeling thyristor TV7 via diode D7, the diode D26 is connected to the diode D25, and the diode D25 is connected to the voltage divider resistor R15 via a semiconductor discharge unit and a power resistor unit.

[0011] As a preferred technical solution, the Zener diode U1 is also connected to one end of the capacitor C2, and the other end of the capacitor C2 is connected to one end of the resistor R9 and one end of the voltage divider resistor R15 respectively. The other end of the resistor R9 is connected to the Zener diode U1, and the other end of the voltage divider resistor R15 is connected to the output electrode OUT+; the diode D26 is also connected to the output electrode OUT-.

[0012] As a preferred technical solution, the semiconductor discharge unit includes four semiconductor discharge tubes TSS1 to TSS4, each of which is connected in parallel with a resistor; the power resistor unit includes two resistors R8 and R13 connected in parallel.

[0013] As a preferred technical solution, one end of the thyristor rectifier bridge is connected to the INA terminal, INB terminal, and INC terminal of the three-phase power grid, and the other end of the thyristor rectifier bridge is connected to the output electrode via a parallel freewheeling thyristor TV7. The output electrode is connected to an inductive load. A bidirectional thyristor group includes two unidirectional thyristors connected in series.

[0014] As a preferred technical solution, the digital control module includes four motor drive chips, wherein three motor drive chips are used to control the six unidirectional thyristors in the thyristor rectifier bridge, and one motor drive chip is used to control the freewheeling thyristor TV7.

[0015] As a preferred technical solution, the four motor drive chips are motor drive chip U15, motor drive chip U16, motor drive chip U17 and motor drive chip U18. Motor drive chip U15, motor drive chip U16 and motor drive chip U17 are used to control the thyristor rectifier bridge, and motor drive chip U18 is used to control the freewheeling thyristor TV7.

[0016] Pin 5 of the motor driver chip U15 is connected to pin 1 of the pulse transformer T1 via capacitor CTV1; pin 2 of the pulse transformer T1 is grounded (GND); pin 3 of the pulse transformer T1 is connected to pin 2 of diode D11 and pin 1 of diode D12 respectively; pin 3 of diode D11 is connected to the control electrode of the unidirectional thyristor TV1 in the power regulation module; pin 3 of diode D12 is connected to the output terminal OUT; pin 4 of the pulse transformer T1 is connected to pin 1 of diode D11 and pin 2 of diode D12 respectively.

[0017] Pin 8 of the motor drive chip U15 is connected to pin 1 of the pulse transformer T2 via capacitor CTV2; pin 2 of the pulse transformer T2 is grounded (GND); pin 3 of the pulse transformer T2 is connected to pin 2 of diode D13 and pin 1 of diode D14 respectively; pin 3 of diode D13 is connected to the control electrode of the unidirectional thyristor TV2 in the power regulation module; pin 3 of diode D14 is connected to the INC terminal of the three-phase power supply; pin 4 of the pulse transformer T2 is connected to pin 1 of diode D13 and pin 2 of diode D14 respectively.

[0018] Pin 5 of the motor driver chip U16 is connected to pin 1 of the pulse transformer T3 via capacitor CTV3; pin 2 of the pulse transformer T3 is grounded (GND); pin 3 of the pulse transformer T3 is connected to pin 2 of diode D15 and pin 1 of diode D16; pin 3 of diode D15 is connected to the control electrode of the unidirectional thyristor TV3 in the power regulation module; pin 3 of diode D16 is connected to the output terminal OUT; pin 4 of the pulse transformer T3 is connected to pin 1 of diode D15 and pin 2 of diode D16.

[0019] Pin 8 of the motor drive chip U16 is connected to pin 1 of the pulse transformer T4 via capacitor CTV4; pin 2 of the pulse transformer T4 is grounded (GND); pin 3 of the pulse transformer T4 is connected to pin 2 of diode D17 and pin 1 of diode D18 respectively; pin 3 of diode D17 is connected to the control electrode of the unidirectional thyristor TV4 in the power regulation module; pin 3 of diode D18 is connected to the INA terminal of the three-phase power supply; pin 4 of the pulse transformer T4 is connected to pin 1 of diode D17 and pin 2 of diode D18 respectively.

[0020] Pin 5 of the motor driver chip U17 is connected to pin 1 of the pulse transformer T5 via capacitor CTV5; pin 2 of the pulse transformer T5 is grounded (GND); pin 3 of the pulse transformer T5 is connected to pin 2 of diode D19 and pin 1 of diode D20 respectively; pin 3 of diode D19 is connected to the control electrode of the unidirectional thyristor TV5 in the power regulation module; pin 3 of diode D20 is connected to the output terminal OUT; pin 4 of the pulse transformer T5 is connected to pin 1 of diode D19 and pin 2 of diode D20 respectively.

[0021] Pin 8 of the motor drive chip U17 is connected to pin 1 of the pulse transformer T6 via capacitor CTV6; pin 2 of the pulse transformer T6 is grounded (GND); pin 3 of the pulse transformer T6 is connected to pin 2 of diode D21 and pin 1 of diode D22 respectively; pin 3 of diode D21 is connected to the control electrode of the unidirectional thyristor TV6 in the power regulation module; pin 3 of diode D22 is connected to the INB terminal of the three-phase power supply; pin 4 of the pulse transformer T6 is connected to pin 1 of diode D21 and pin 2 of diode D22 respectively.

[0022] Pin 5 of the motor driver chip U18 is connected to pin 1 of the pulse transformer T7 via capacitor CTV7; pin 2 of the pulse transformer T7 is grounded (GND); pin 3 of the pulse transformer T7 is connected to pin 2 of diode D23 and pin 1 of diode D24 respectively; pin 3 of diode D23 is connected to the control electrode of the freewheeling thyristor TV7 in the power regulation module; pin 3 of diode D24 is connected to the output terminal OUT; pin 4 of the pulse transformer T7 is connected to pin 1 of diode D23 and pin 2 of diode D24 respectively.

[0023] As a preferred technical solution, an output electrode is provided on one side of the housing, including an output electrode OUT+ and an output electrode OUT-, and an input electrode is provided on the other side of the housing, including an input electrode R, an input electrode T and an input electrode S; wherein the input electrode R, the input electrode T and the input electrode S are located on different horizontal planes.

[0024] As a preferred technical solution, the input electrode R and the input electrode T are located above the input electrode S, and the distance h between the input electrode S and the input electrode R, or between the input electrode S and the input electrode T, is 15-20 mm.

[0025] As a preferred technical solution, the enclosure is also provided with oppositely arranged cooling fans and cooling holes.

[0026] This invention provides a precise control power regulator for inductive loads, featuring active freewheeling protection in case of phase loss. Through a power regulation module and a hardware protection module, it quickly identifies the back EMF path upon phase loss and actively adjusts the freewheeling circuit impedance to suppress voltage spikes. Dynamic mode switching control uses a digital control module's main control board algorithm to judge the load status in real time, allowing for a smooth transition between rectification and inverter modes without hardware switching, and accurately defining the load's operating range. Continuous phase amplitude adjustment employs a closed-loop control strategy, continuously adjusting the duty cycle or conduction angle of the thyristor rectifier bridge to achieve arbitrary adjustment of the inverter amplitude within the range of 0° to 90°, and approaching 0° when stopped to adapt to the dynamic changes in inductive load characteristics. This significantly improves the reliability, energy efficiency, and control accuracy of the power regulator under complex operating conditions, providing a new technical solution for high-precision inductive load control. It is widely used in industrial resistance heating equipment, motor soft starters, and laboratory adjustable power supplies to achieve continuous and precise control of three-phase voltage. Regarding the input electrode wiring, the three input electrodes are not located on the same horizontal plane to avoid wiring confusion and congestion, enhance electrical safety and insulation performance, and facilitate installation and maintenance. Attached Figure Description

[0027] Figure 1 This is a circuit diagram of the power regulator for precise control of inductive loads according to this utility model;

[0028] Figure 2 This is the circuit diagram for the digital control module;

[0029] Figure 3 This is a schematic diagram of the structure of the precision control power regulator for inductive loads according to this utility model;

[0030] Figure 4 This is a front view of the precision control power regulator for inductive loads according to this utility model;

[0031] Figure 5 This is a rear view of the power regulator for precise control of inductive loads according to this utility model;

[0032] Figure 6 This is a top view of the power regulator for precise control of inductive loads according to this utility model;

[0033] In the picture:

[0034] 1-Box housing, 2-Output electrode OUT+, 3-Output electrode OUT-, 4-Heat dissipation hole, 5-Input electrode R, 6-Input electrode T, 7-Input electrode S, 8-Cooling fan. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0036] Example 1:

[0037] See Figures 1 to 3 This utility model provides a precise control power regulator for inductive loads, including a housing 1. A circuit board is housed inside the housing 1. Output electrodes, including output electrode OUT+2 and output electrode OUT-3, are located on one side of the housing 1. Input electrodes, including input electrode R5, input electrode T6, and input electrode S7, are located on different horizontal planes. Preferably, input electrode R5 and input electrode T6 are located above input electrode S7. The distance h between input electrode S7 and input electrode R5, or between input electrode S7 and input electrode T6, is 15-20 mm. By placing input electrodes R5, T6, and S7 on different horizontal planes, contact between the connecting wires of each input electrode R5, T6, and S7 with other input electrodes can be avoided, enhancing electrical safety and insulation performance, and facilitating installation and maintenance.

[0038] The housing 1 is also equipped with a cooling fan 8 and a cooling hole 4 arranged opposite to each other. The cooling hole 4 is preferably located on the side where the input electrode is located; the cooling fan 8 is located on the side where the output electrode is located. Air cooling is used for heat dissipation, which is both environmentally friendly and safe.

[0039] See Figure 1 and Figure 2 The circuit board is equipped with a power regulation module, a digital control module, and a hardware protection module.

[0040] The power regulation module is connected to an inductive load via a hardware protection module, and the power regulation module is also connected to a digital control module.

[0041] The power regulation module includes a thyristor rectifier bridge composed of three bidirectional thyristor groups and a freewheeling thyristor TV7. One end of the thyristor rectifier bridge is connected to the INA, INB, and INC terminals of the three-phase power grid, and the other end of the thyristor rectifier bridge is connected to the output electrode via the parallel freewheeling thyristor TV7. The output electrode is connected to an inductive load, and can be dynamically adjusted and precisely controlled according to the implementation requirements of the inductive load.

[0042] A bidirectional thyristor group consists of two unidirectional thyristors connected in series.

[0043] Three bidirectional thyristor groups are connected in parallel. Specifically, they are: a bidirectional thyristor group consisting of unidirectional thyristor TV1 and unidirectional thyristor TV4; a bidirectional thyristor group consisting of unidirectional thyristor TV3 and unidirectional thyristor TV6; and a bidirectional thyristor group consisting of unidirectional thyristor TV5 and unidirectional thyristor TV2.

[0044] Among them, unidirectional thyristor TV1 and unidirectional thyristor TV4 are connected in series and connected to the INA terminal. The cathode of unidirectional thyristor TV1 is connected to the input terminal of the hardware protection module, and the anode of unidirectional thyristor TV4 is connected to the output terminal of the hardware protection module. The control electrodes of unidirectional thyristor TV1 and unidirectional thyristor TV4 are both connected to the digital control module.

[0045] Unidirectional thyristor TV3 and unidirectional thyristor TV6 are connected in series and connected to the INB terminal. The cathode of unidirectional thyristor TV3 is connected to the input terminal of the hardware protection module, and the anode of unidirectional thyristor TV6 is connected to the output terminal of the hardware protection module. The control electrodes of unidirectional thyristor TV3 and unidirectional thyristor TV6 are both connected to the digital control module.

[0046] Unidirectional thyristor TV5 and unidirectional thyristor TV2 are connected in series and connected to the INC terminal. The cathode of unidirectional thyristor TV5 is connected to the input terminal of the hardware protection module, and the anode of unidirectional thyristor TV2 is connected to the output terminal of the hardware protection module. The control electrodes of unidirectional thyristor TV5 and unidirectional thyristor TV2 are both connected to the digital control module.

[0047] The freewheeling thyristor TV7 is connected in parallel with the hardware protection module and is respectively connected to the output electrode.

[0048] Specifically, the cathode of the freewheeling thyristor TV7 is connected to the input terminal of the hardware protection module, and the anode of the freewheeling thyristor TV7 is connected to the output terminal of the hardware protection module. The control electrode of the freewheeling thyristor TV7 is connected to the digital control module.

[0049] The freewheeling thyristor TV7 was obtained through commercial means, and its model number is ZMM5V6.

[0050] The hardware protection module includes a Zener diode U1, a capacitor C2, and diodes D26 and D25 connected in series.

[0051] The Zener diode U1 is connected in parallel between the cathode and the control electrode of the freewheeling thyristor TV7 via diode D7. The Zener diode U1 is also connected to one end of capacitor C2. The other end of capacitor C2 is connected to one end of resistor R9 and one end of voltage divider resistor R15. The other end of resistor R9 is connected to the Zener diode U1, and the other end of voltage divider resistor R15 is connected to the output electrode OUT+.

[0052] One end of diode D26 is connected to the output electrode OUT-, and the other end of diode D26 is connected to one end of diode D25. The other end of diode D25 is connected to voltage divider resistor R15 via semiconductor discharge unit and power resistor unit.

[0053] The semiconductor discharge unit includes four semiconductor discharge tubes TSS1 to TSS4, and each semiconductor discharge tube is connected in parallel with a resistor.

[0054] The power resistor unit includes two resistors connected in parallel, R8 and R13.

[0055] The voltage regulator U1 was obtained commercially and its model number is ZMM5V6.

[0056] In the hardware protection module, when the power supply is disconnected, the inductive load generates a reverse electromotive force that breaks down the semiconductor discharge tubes (TSS1 to TSS4), generating a voltage to restart the freewheeling thyristor TV7.

[0057] The digital control module includes four motor drive chips, of which three motor drive chips are used to control the six unidirectional thyristors in the thyristor rectifier bridge, and one motor drive chip is used to control the freewheeling thyristor TV7.

[0058] The four motor driver chips are motor driver chip U15, motor driver chip U16, motor driver chip U17 and motor driver chip U18. Motor driver chips U15, U16 and U17 are used to control the thyristor rectifier bridge, and motor driver chip U18 is used to control the freewheeling thyristor TV7.

[0059] Pin 5 of the motor drive chip U15 is connected to pin 1 of the pulse transformer T1 via capacitor CTV1; pin 2 of the pulse transformer T1 is grounded to GND; pin 3 of the pulse transformer T1 is connected to pin 2 of diode D11 and pin 1 of diode D12 respectively; pin 3 of diode D11 is connected to the control electrode of the unidirectional thyristor TV1 in the power regulation module; pin 3 of diode D12 is connected to the output terminal OUT; pin 4 of the pulse transformer T1 is connected to pin 1 of diode D11 and pin 2 of diode D12 respectively.

[0060] Pin 8 of the motor drive chip U15 is connected to pin 1 of the pulse transformer T2 via capacitor CTV2; pin 2 of the pulse transformer T2 is grounded to GND; pin 3 of the pulse transformer T2 is connected to pin 2 of diode D13 and pin 1 of diode D14 respectively; pin 3 of diode D13 is connected to the control electrode of the unidirectional thyristor TV2 in the power regulation module; pin 3 of diode D14 is connected to the INC terminal of the three-phase power supply; pin 4 of the pulse transformer T2 is connected to pin 1 of diode D13 and pin 2 of diode D14 respectively.

[0061] Pin 5 of the motor drive chip U16 is connected to pin 1 of the pulse transformer T3 via capacitor CTV3; pin 2 of the pulse transformer T3 is grounded to GND; pin 3 of the pulse transformer T3 is connected to pin 2 of diode D15 and pin 1 of diode D16 respectively; pin 3 of diode D15 is connected to the control electrode of the unidirectional thyristor TV3 in the power regulation module; pin 3 of diode D16 is connected to the output terminal OUT; pin 4 of the pulse transformer T3 is connected to pin 1 of diode D15 and pin 2 of diode D16 respectively.

[0062] Pin 8 of the motor drive chip U16 is connected to pin 1 of the pulse transformer T4 via capacitor CTV4; pin 2 of the pulse transformer T4 is grounded to GND; pin 3 of the pulse transformer T4 is connected to pin 2 of diode D17 and pin 1 of diode D18 respectively; pin 3 of diode D17 is connected to the control electrode of the unidirectional thyristor TV4 in the power regulation module; pin 3 of diode D18 is connected to the INA terminal of the three-phase power supply; pin 4 of the pulse transformer T4 is connected to pin 1 of diode D17 and pin 2 of diode D18 respectively.

[0063] Pin 5 of the motor drive chip U17 is connected to pin 1 of the pulse transformer T5 via capacitor CTV5; pin 2 of the pulse transformer T5 is grounded to GND; pin 3 of the pulse transformer T5 is connected to pin 2 of diode D19 and pin 1 of diode D20 respectively; pin 3 of diode D19 is connected to the control electrode of the unidirectional thyristor TV5 in the power regulation module; pin 3 of diode D20 is connected to the output terminal OUT; pin 4 of the pulse transformer T5 is connected to pin 1 of diode D19 and pin 2 of diode D20 respectively.

[0064] Pin 8 of the motor drive chip U17 is connected to pin 1 of the pulse transformer T6 via capacitor CTV6; pin 2 of the pulse transformer T6 is grounded to GND; pin 3 of the pulse transformer T6 is connected to pin 2 of diode D21 and pin 1 of diode D22 respectively; pin 3 of diode D21 is connected to the control electrode of the unidirectional thyristor TV6 in the power regulation module; pin 3 of diode D22 is connected to the INB terminal of the three-phase power supply; pin 4 of the pulse transformer T6 is connected to pin 1 of diode D21 and pin 2 of diode D22 respectively.

[0065] Pin 5 of the motor driver chip U18 is connected to pin 1 of the pulse transformer T7 via capacitor CTV7; pin 2 of the pulse transformer T7 is grounded (GND); pin 3 of the pulse transformer T7 is connected to pin 2 of diode D23 and pin 1 of diode D24 respectively; pin 3 of diode D23 is connected to the control electrode of the freewheeling thyristor TV7 in the power regulation module; pin 3 of diode D24 is connected to the output terminal OUT; pin 4 of the pulse transformer T7 is connected to pin 1 of diode D23 and pin 2 of diode D24 respectively.

[0066] Motor driver chips U15, U16, U17 and U18 have the same model number and are all obtained through commercial channels. The model number is DRV88DDAR.

[0067] The digital control module uses four DRV88DDAR motor driver chips to trigger waveforms and drive pulse transformers T1 to T7; it dynamically drives seven unidirectional thyristors according to their status to achieve isolation, and then drives the thyristor module.

[0068] Working principle:

[0069] Status 1: The regulator (the power regulator for precise control of inductive loads of this utility model, hereinafter referred to as the regulator) is starting up.

[0070] When the regulator is in output mode (such as motor start-up or electromagnet magnetization): At this time, the three bidirectional thyristor groups are turned on according to the rectification sequence, and then the freewheeling thyristor TV7 is turned on to prevent the regulator output from entering the negative value region. The output is slowly increased until the target value is reached. At this time, the regulator is in rectification mode.

[0071] Status 2: Regulator in operation.

[0072] By using PID control to stabilize the output at the target value, the AC power from the grid is rectified into DC to drive the inductive load. At this time, the regulator is in rectification mode.

[0073] The target value can be set as needed, such as 50V or 60A.

[0074] Status 3: Regulator stopped.

[0075] When the freewheeling thyristor TV7 is turned off, the three bidirectional thyristor groups (TV1 to TV6) are slowly turned off. Because the freewheeling thyristor TV7 is turned off, alternating or inverting occurs. When the inverting angle gradually approaches 0, the regulator is in a discharge state.

[0076] Energy feedback from inductive loads (such as motor braking, electromagnet demagnetization):

[0077] The main control board reconfiguration trigger waveform gradually decreases in output according to the set time. At the same time, the freewheeling thyristor TV7 is turned off, causing the three bidirectional thyristor groups (TV1 to TV6) to switch to inverter mode. The inductive load generates back electromotive force, which is rectified and the thyristors feed energy back to the grid to achieve discharge. When the inverter angle gradually approaches 0, the regulator is in the discharge state.

[0078] Status 4: Regulator stopped.

[0079] When the inverter angle approaches 0, maintain this position for a period of time to ensure complete discharge until it stops. At this point, the regulator is in the discharge state.

[0080] Status 5: Regulator is malfunctioning.

[0081] Due to factors such as a phase loss in the power grid input or a sudden power outage of the regulator, the inductive load circuit may be disconnected or the inverter may fail. This generates a reverse electromotive force that, through diodes D25 and D26, breaks down multiple semiconductor discharge tubes (TSS1 to TSS4). After passing through power resistors R18 and R13 and voltage divider resistor R15, a voltage is generated across these tubes, driving the freewheeling thyristor TV7 to form a current loop and protect the preceding thyristor rectifier bridge. A ZMM5V6 Zener diode U1 is connected in parallel between the control electrode and cathode of the freewheeling thyristor TV7 to prevent damage to it. At this time, the equipment is in a protected state.

[0082] This invention provides a precise control power regulator for inductive loads, which can be widely used in industrial resistance heating equipment, motor soft starters, laboratory adjustable power supplies and other scenarios to achieve precise regulation and intelligent control of three-phase voltage.

[0083] Phase loss active freewheeling protection technology: Combining freewheeling diodes and intelligent detection modules, it can quickly identify the back EMF path at the moment of phase loss, actively adjust the freewheeling circuit impedance, and suppress voltage spikes.

[0084] Dynamic mode switching control: Based on the main control board algorithm, the load status is judged in real time, and the load can be smoothly transitioned between rectification and inverter modes without hardware switching, and the load working range can be accurately divided.

[0085] Continuous phase amplitude adjustment: A closed-loop control strategy is adopted, which continuously adjusts the duty cycle or conduction angle of the thyristor rectifier bridge to achieve arbitrary adjustment of the inverter amplitude within the range of 0° to 90°, adapting to dynamic changes in load characteristics.

[0086] This invention provides a precise control power regulator for inductive loads, featuring active freewheeling protection in case of phase loss. Through a power regulation module and a hardware protection module, it quickly identifies the back EMF path during phase loss and actively adjusts the freewheeling circuit impedance to suppress voltage spikes. Dynamic mode switching control allows for real-time load status assessment via a digital control module, enabling smooth transition between rectification and inverter modes without hardware switching, and precisely defining the load operating range. Continuous phase amplitude adjustment employs a closed-loop control strategy, continuously adjusting the duty cycle or conduction angle of the thyristor rectifier bridge to achieve arbitrary adjustment of the inverter amplitude within the range of 0° to 90°, adapting to dynamic changes in inductive load characteristics. This significantly improves the reliability, energy efficiency, and control accuracy of the power regulator under complex operating conditions, providing a new technical solution for high-precision inductive load control. It is widely used in industrial resistance heating equipment, motor soft starters, and laboratory adjustable power supplies to achieve precise regulation and intelligent control of three-phase voltage. Regarding input electrode wiring, the three input electrodes are not located on the same horizontal plane, avoiding wiring confusion and congestion, enhancing electrical safety and insulation performance, and facilitating installation and maintenance.

[0087] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

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