Series half-bridge scr resonant power supply for ceramic induction cooker

Abstract

The utility model relates to SCR resonant power supply, concretely relates to a series connection half -bridge SCR resonant power supply for ceramic induction cooker, including three -phase electric interface, input filter module, SCR phase -controlled rectifier module, direct current reactance filter module, capacitor filter module and SCR half -bridge inverter module that link up in proper order, be equipped with rectification control module on the SCR phase -controlled rectifier module, the SCR half -bridge inverter module is linked to the induction coil of ceramic induction cooker, be equipped with inverter control module on the SCR half -bridge inverter module, and inverter control module is connected with the thermocouple in ceramic induction cooker through PID temperature regulator, the utility model discloses can realize the continuous regulation of power, and power is continuously adjustable from starting power to rated power, simultaneously, still realize the PID regulation of power, improve the temperature precision in ceramic induction cooker.

Description

Technical Field

[0001] This utility model relates to SCR resonant power supplies, specifically to a series half-bridge SCR resonant power supply for ceramic induction cookers. Background Technology

[0002] Traditionally, coated sheet and strip production lines have used industrial frequency ceramic induction plating pots for coating production. In traditional processes, the temperature control of the plating solution inside the industrial frequency ceramic induction galvanizing pot relies on an industrial frequency (fixed frequency) power supply. Specifically, the control method involves using a thermocouple inserted into the plating solution to provide real-time feedback on the solution temperature. This temperature is compared with the temperature set in the process, and a low-temperature or high-temperature control signal is output based on the comparison result. This signal then controls the industrial frequency (fixed frequency) power supply to apply high or low voltage, thereby regulating the voltage and power of the industrial frequency ceramic induction galvanizing pot and ultimately controlling the temperature of the plating solution to meet the requirements of the sheet and strip coating production process.

[0003] Currently, there are several types of popular power frequency power supply devices, including those using the "capacitor-reactance balance" principle, the "capacitor V-type balance" principle, and the Scott transformer principle. These power supply devices all regulate voltage and power output by controlling the voltage levels of a voltage regulator. While this can meet the basic requirements of strip coating production, the inability to achieve continuous adjustment results in poor temperature accuracy within the ceramic induction cooker, thus affecting the stability of coating production quality. Utility Model Content

[0004] The purpose of this invention is to solve the technical problem that traditional power frequency power supply devices cannot achieve continuous adjustment, resulting in poor temperature accuracy inside the ceramic induction pot, which in turn affects the stability of coating production quality. The invention provides a series half-bridge SCR resonant power supply for ceramic induction pots.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A series half-bridge SCR resonant power supply for ceramic induction cookers includes a three-phase electrical interface, an input filter module, an SCR phase-controlled rectifier module, a DC reactor filter module, a capacitor filter module, and an SCR half-bridge inverter module connected in sequence.

[0007] The SCR phase-controlled rectifier module is equipped with a rectifier control module;

[0008] The SCR half-bridge inverter module is connected to the induction coil of the ceramic induction cooker.

[0009] The SCR half-bridge inverter module is equipped with an inverter control module, which is connected to the thermocouple inside the ceramic induction cooker through a PID temperature regulator.

[0010] Furthermore, the SCR half-bridge inverter module includes capacitors Cs1 and Cs2 with the same capacitance value, and one end of capacitor Cs1 and one end of capacitor Cs2 are both connected to one end of the induction coil.

[0011] A first thyristor half-bridge inverter circuit is provided between the other end of capacitor Cs1 and the other end of induction coil.

[0012] A second thyristor half-bridge inverter circuit is provided between the other end of capacitor Cs2 and the other end of the induction coil.

[0013] The first and second thyristor half-bridge inverter circuits are respectively connected in parallel with a first surge voltage absorption circuit and a second surge voltage absorption circuit.

[0014] Furthermore, the first thyristor half-bridge inverter circuit includes an SCR device T7, the anode of the SCR device T7 being connected to one end of the inductor LP1 and the cathode of the diode ZK1.

[0015] The other end of the inductor LP1 is connected to the other end of the capacitor Cs1;

[0016] The anode of the diode ZK1 is connected to the cathode of the SCR device T7, and the cathode of the SCR device T7 is connected to the other end of the induction coil.

[0017] The gate of the SCR device T7 is connected to the inverter control module;

[0018] The second thyristor half-bridge inverter circuit includes an SCR device T8, the anode of which is connected to the cathode of diode ZK2, the other end of the induction coil, and the cathode of SCR device T7.

[0019] The anode of diode ZK2 is connected to the cathode of SCR device T8, the cathode of SCR device T8 is connected to one end of inductor LP2, and the other end of inductor LP2 is connected to the other end of capacitor Cs2.

[0020] The gate of the SCR device T8 is connected to the inverter control module.

[0021] Furthermore, the first surge voltage absorption circuit includes a diode Zx1, the anode of the diode Zx1 is connected to the anode of the SCR device T7, the cathode of the diode Zx1 is connected to one end of the resistor Rx_1, and the other end of the resistor Rx_1 is connected to the cathode of the SCR device T7 through the capacitor Cx1.

[0022] The second surge voltage absorption circuit includes a diode Zx2. The anode of the diode Zx2 is connected to the anode of the SCR device T8, and the cathode of the diode Zx2 is connected to one end of the resistor Rx_2. The other end of the resistor Rx_2 is connected to the cathode of the SCR device T8 through the capacitor Cx2.

[0023] Furthermore, resistors Rb1 and Rb2 are connected in parallel across the two ends of SCR device T7 and the two ends of SCR device T8, respectively.

[0024] Furthermore, the SCR phase-controlled rectifier module includes an A-phase SCR phase-controlled rectifier module, a B-phase SCR phase-controlled rectifier module, and a C-phase SCR phase-controlled rectifier module that are respectively connected to the A-phase, B-phase, and C-phase of the three-phase electrical interface.

[0025] The A-phase SCR phase-controlled rectifier module includes SCR devices T2 and T5; the cathode of SCR device T2 and the anode of SCR device T5 are connected to phase A.

[0026] A resistor R2 and a capacitor C2 are connected in series between the anode and cathode of SCR device T2; a resistor R5 and a capacitor C5 are connected in series between the anode and cathode of SCR device T5.

[0027] The B-phase SCR phase-controlled rectifier module includes SCR devices T3 and T6; the cathode of SCR device T6 and the anode of SCR device T3 are connected to the B phase.

[0028] A resistor R3 and a capacitor C3 are connected in series between the anode and cathode of SCR device T3; a resistor R6 and a capacitor C6 are connected in series between the anode and cathode of SCR device T6.

[0029] The C-phase SCR phase-controlled rectifier module includes SCR devices T1 and T4; the cathode of SCR device T4 and the anode of SCR device T1 are connected to the C phase.

[0030] A resistor R1 and a capacitor C1 are connected in series between the anode and cathode of SCR device T1; a resistor R4 and a capacitor C4 are connected in series between the anode and cathode of SCR device T4.

[0031] The cathodes of the SCR devices T1, T3, and T5 are all connected to the DC reactor filter module.

[0032] The anodes of the SCR devices T2, T4, and T6 are all connected to the DC reactor filter module;

[0033] The gates of the SCR devices T1, T2, T3, T4, T5, and T6 are all connected to the rectifier control module.

[0034] Furthermore, the DC reactance filter module includes an inductor Ld with one end connected to the cathode of SCR devices T1, T3, and T5;

[0035] The other end of the inductor Ld is connected to the anode of the diode ZP, and the cathode of the diode ZP is connected to the capacitor filter module.

[0036] Furthermore, the input filtering module includes inductors La, Lb, and Lc connected in series with phases A, B, and C of the three-phase electrical interface, respectively.

[0037] Furthermore, the capacitor filtering module includes a capacitor Cd, the two ends of which are connected to the cathode of diode ZP and the anode of SCR devices T2, T4, and T6, respectively.

[0038] Resistors R11_1, R11_2, and R11_3 are connected in parallel across the capacitor Cd.

[0039] Furthermore, the rectification control module is a ZL6M-DX rectifier board;

[0040] The ZL6M-DX rectifier board is connected to the gates of SCR devices T1, T2, T3, T4, T5, and T6;

[0041] The inverter control module includes an inverter trigger board and a CBM13 / DX inverter board connected to the inverter trigger board.

[0042] The inverter trigger board is connected to the gates of SCR devices T7 and T8;

[0043] The CBM13 / DX inverter board is connected to the PID temperature regulator.

[0044] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0045] The ceramic induction cooker provided by this utility model uses a series half-bridge SCR resonant power supply. The three-phase grid voltage enters the SCR phase-controlled rectifier module via a three-phase power interface and an input filter module. The SCR phase-controlled rectifier module converts the three-phase power into DC power, which is then filtered by a DC reactance filter module and a capacitor filter module to provide a stable voltage source for the SCR half-bridge inverter module. This voltage source is divided by two sets of capacitors of the same capacitance value, and then, via the first and second thyristor half-bridge inverter circuits, applies half of the fundamental voltage to the induction coil inside the ceramic induction cooker, forming the upper and lower voltages. The lower half-bridge alternating oscillation LC circuit generates eddy currents in the induction coil to heat the raw materials in the ceramic induction cooker. A continuous trigger signal is generated by the inverter control module to control the alternating charging and discharging of the first and second thyristor half-bridge inverter circuits, achieving continuous power regulation. The power is continuously adjustable from the initial power to the rated power. Simultaneously, in conjunction with a PID temperature regulator and thermocouples, the inverter control module generates corresponding trigger signals based on temperature data collected by the thermocouples inside the ceramic induction cooker. This improves the temperature accuracy inside the ceramic induction cooker while achieving PID power regulation. Attached Figure Description

[0046] Figure 1This is a structural block diagram of an embodiment of the present utility model;

[0047] Figure 2 This is a schematic diagram of the circuit structure of an embodiment of the present utility model;

[0048] Figure 3 This is a schematic diagram of the current waveform in the induction coil during the initial state in an embodiment of this utility model;

[0049] Figure 4 This is a schematic diagram of the current waveform in the induction coil when the power is increased in an embodiment of this utility model;

[0050] Figure 5 This is a schematic diagram of the current waveform in the induction coil when the power is at its maximum in an embodiment of this utility model. Detailed Implementation

[0051] The technical solutions of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0052] In this embodiment, the series half-bridge SCR resonant power supply for the ceramic induction cooker is similar to that of a traditional medium-frequency induction heating power supply, adopting an AC-DC-AC conversion mode. The three-phase grid voltage enters the SCR phase-controlled rectifier module through the three-phase power interface and input filter module. After the SCR phase-controlled rectifier module converts the three-phase power into DC power, it is filtered by the DC reactance filter module and the capacitor filter module to provide a stable voltage source for the SCR half-bridge inverter module. The voltage source is divided by two sets of capacitors of the same capacitance value, and then half of the fundamental voltage is applied to the induction coil in the ceramic induction cooker through the first and second thyristor half-bridge inverter circuits, forming an upper and lower half-bridge alternating oscillating LC circuit. Eddy currents are generated in the induction coil to heat the raw materials in the ceramic induction cooker.

[0053] like Figure 1 As shown, a series half-bridge SCR resonant power supply for a ceramic induction cooker includes a three-phase electrical interface, an input filter module, an SCR phase-controlled rectifier module, a DC reactor filter module, a capacitor filter module, and an SCR half-bridge inverter module connected in sequence. The SCR phase-controlled rectifier module is equipped with a rectifier control module. The SCR half-bridge inverter module is connected to the induction coil of the ceramic induction cooker. The SCR half-bridge inverter module is equipped with an inverter control module, which is connected to the thermocouple inside the ceramic induction cooker through a PID temperature regulator.

[0054] like Figure 2As shown, the SCR half-bridge inverter module includes capacitors Cs1 and Cs2 with the same capacitance value. One end of capacitor Cs1 and one end of capacitor Cs2 are both connected to one end of the induction coil. A first thyristor half-bridge inverter circuit is provided between the other end of capacitor Cs1 and the other end of the induction coil. A second thyristor half-bridge inverter circuit is provided between the other end of capacitor Cs2 and the other end of the induction coil. A first surge voltage absorption circuit and a second surge voltage absorption circuit are respectively connected in parallel across the two ends of the first and second thyristor half-bridge inverter circuits.

[0055] The SCR half-bridge inverter module operates at a frequency of 35Hz-70Hz; the higher the frequency, the greater the output power. The trigger pulse frequency of the inverter control module is slightly lower than the load resonant frequency f0.

[0056] like Figure 2 As shown, the first thyristor half-bridge inverter circuit includes an SCR device T7. The anode of the SCR device T7 is connected to one end of the inductor LP1 and the cathode of the diode ZK1. The other end of the inductor LP1 is connected to the other end of the capacitor Cs1. The anode of the diode ZK1 is connected to the cathode of the SCR device T7. The cathode of the SCR device T7 is connected to the other end of the induction coil. The gate of the SCR device T7 is connected to the inverter control module.

[0057] like Figure 2 As shown, the second thyristor half-bridge inverter circuit includes an SCR device T8. The anode of the SCR device T8 is connected to the cathode of diode ZK2, the other end of the induction coil, and the cathode of SCR device T7. The anode of diode ZK2 is connected to the cathode of SCR device T8. The cathode of SCR device T8 is connected to one end of inductor LP2. The other end of inductor LP2 is connected to the other end of capacitor Cs2. The gate of SCR device T8 is connected to the inverter control module.

[0058] Inductors LP1 and LP2 are used to suppress the surge current during commutation of the SCR device. At the same time, inductors LP1 and LP2 are also part of the half-bridge inverter circuit, and their size will affect the operating frequency of the SCR half-bridge inverter module.

[0059] In this embodiment, the three-phase power connected to the three-phase power interface is rectified by the SCR phase-controlled rectifier module and output as DC power with voltage Ud; that is, the voltage across capacitor Cd is Ud.

[0060] The voltage across capacitor Cd is divided equally by capacitors Cs1 and Cs2, both of which are charged with a positive voltage at the top and a negative voltage at the bottom.

[0061] When t = to, the SCR device T7 is triggered. At this time, the current flowing through the induction cooker (resistor Rj and inductor DL ​​in this application) consists of two parts: one is the discharge current of capacitor Cs1, and the charging current direction is: upper end of capacitor Cs1 - inductor LP1 - SCR device T7 - ​​resistor Rj - inductor DL ​​- lower end of capacitor Cs1; the other is the charging current of capacitor Cs2, and the charging current direction is: upper end of capacitor Cd - inductor LP1 - SCR device T7 - ​​resistor Rj - inductor DL ​​- capacitor Cs2 - lower end of capacitor Cd. Both of these paths are part of the same resonant circuit. The former consists of capacitor Cs1, inductor LP1, resistor Rj, and inductor DL, and the latter consists of capacitor Cs2, inductor LP2, resistor Rj, and inductor DL. Since capacitors Cs1 and Cs2 have the same capacitance value, the two circuits operate at the same frequency, that is, the same as the resonant frequency of the overall circuit.

[0062] At t = t1, capacitor Cs1 finishes discharging, meaning its voltage is zero. The charging voltage across capacitor Cs2 must be Ud, because the voltage Ud across capacitor Cd is constant and equal to the sum of the voltages across capacitors Cs1 and Cs2. At this time, the current flowing through resistor Rj and inductor DL ​​is at its maximum. Under the influence of the magnetic field energy stored in inductors DL and LP1, the two current paths continue to flow, causing capacitor Cs1 to reverse charge to positive at the bottom and negative at the top, while capacitor Cs2 continues to increase its Ud value until t = t2, when the magnetic field energy drops to zero. At this point, both the reverse voltage across capacitor Cs1 and the voltage across capacitor Cs2 reach their maximum values, and the current flowing through the induction cooker (resistor Rj and inductor DL) is a half-sine wave. Then, under the influence of the voltages of capacitors Cs1 and Cs2, two current paths are formed that are basically the same as the two paths mentioned above (where SCR device T7 is replaced by diode ZK1), but in completely opposite directions. The current continues to change sinusoidally until t = t4, at which point capacitor Cs1 is positively charged to 1 / 2Ud, and the voltage across capacitor Cs2 also returns to 1 / 2Ud. The current drops to zero, and the current flowing through the induction cooker is exactly a negative half-wave of a sine wave. Then, at t = t4, the SCR device T8 is triggered. Capacitor Cs2 discharges through inductor DL, resistor Rj, SCR device T8, and LP2, while capacitor Cs1 is charged by capacitor Cd through inductor DL, resistor Rj, SCR device T8, and LP2. Throughout this process, the waveform of the current flowing through the induction coil of the induction cooker changes as follows: Figures 3 to 5 As shown.

[0063] Since LP1 = LP2, the current flowing through the induction cooker has the same frequency when SCR devices T7 and T8 are triggered.

[0064] During the above operation, the induction cooker draws energy from the power supply according to half a cycle of the circuit's inherent oscillation, and then sends the energy back to the power supply during the other half cycle. Therefore, the power obtained by the induction cooker is very small. In order to make the induction cooker obtain maximum power, the trigger frequency of the SCR device must be increased to make it closer to the circuit's inherent oscillation frequency.

[0065] The trigger pulse frequency of the voltage source series inverter is always lower than the resonant frequency of the induction cooker. When the trigger pulse frequency is closer to the resonant frequency, the impedance of the induction cooker tends to be low, and the output power tends to be the rated power. When the trigger pulse frequency is lower than the resonant frequency of the induction cooker, the impedance of the induction cooker tends to be low, and the output power tends to be the rated power.

[0066] like Figure 2 As shown, the first surge voltage absorption circuit includes a diode Zx1, the anode of which is connected to the anode of the SCR device T7, the cathode of which is connected to one end of a resistor Rx_1, and the other end of the resistor Rx_1 is connected to the cathode of the SCR device T7 through a capacitor Cx1; the second surge voltage absorption circuit includes a diode Zx2, the anode of which is connected to the anode of the SCR device T8, the cathode of which is connected to one end of a resistor Rx_2, and the other end of the resistor Rx_2 is connected to the cathode of the SCR device T8 through a capacitor Cx2.

[0067] like Figure 2 As shown, resistors Rb1 and Rb2 are connected in parallel across the two ends of SCR device T7 and the two ends of SCR device T8, respectively.

[0068] like Figure 2As shown, the SCR phase-controlled rectifier module includes an A-phase SCR phase-controlled rectifier module, a B-phase SCR phase-controlled rectifier module, and a C-phase SCR phase-controlled rectifier module, which are respectively connected to phases A, B, and C of the three-phase power interface. The A-phase SCR phase-controlled rectifier module includes SCR devices T2 and T5; the cathode of SCR device T2 and the anode of SCR device T5 are connected to phase A; a resistor R2 and a capacitor C2 are connected in series between the anode and cathode of SCR device T2; a resistor R5 and a capacitor C5 are connected in series between the anode and cathode of SCR device T5. The B-phase SCR phase-controlled rectifier module includes SCR devices T3 and T6; the cathode of SCR device T6 and the anode of SCR device T3 are connected to phase B; the anode and cathode of SCR device T3 are connected in series... A resistor R3 and a capacitor C3 are connected in series between the anode and cathode of SCR device T6; a resistor R6 and a capacitor C6 are connected in series between the anode and cathode of SCR device T6; the C-phase SCR phase-controlled rectifier module includes SCR devices T1 and T4; the cathode of SCR device T4 and the anode of SCR device T1 are connected to the C phase; a resistor R1 and a capacitor C1 are connected in series between the anode and cathode of SCR device T1; a resistor R4 and a capacitor C4 are connected in series between the anode and cathode of SCR device T4; the cathodes of SCR devices T1, T3, and T5 are all connected to the DC reactor filter module; the anodes of SCR devices T2, T4, and T6 are all connected to the DC reactor filter module; the gates of SCR devices T1, T2, T3, T4, T5, and T6 are all connected to the rectifier control module.

[0069] like Figure 2 As shown, the DC reactance filter module includes an inductor Ld with one end connected to the cathodes of SCR devices T1, T3, and T5; the other end of the inductor Ld is connected to the anode of diode ZP, and the cathode of diode ZP is connected to the capacitor filter module.

[0070] like Figure 2 As shown, the input filtering module includes inductors La, Lb, and Lc connected in series with phases A, B, and C of the three-phase electrical interface, respectively.

[0071] like Figure 2 As shown, the capacitor filter module includes a capacitor Cd, the two ends of which are connected to the cathode of diode ZP and the anode of SCR devices T2, T4 and T6, respectively; resistors R11_1, R11_2 and R11_3 are also connected in parallel across the two ends of capacitor Cd.

[0072] like Figure 2 As shown, the rectifier control module is a ZL6M-DX rectifier board; the ZL6M-DX rectifier board is connected to the gates of SCR devices T1, T2, T3, T4, T5, and T6; the inverter control module includes an inverter trigger board and a CBM13 / DX inverter board connected to the inverter trigger board; the inverter trigger board is connected to the gates of SCR devices T7 and T8; the CBM13 / DX inverter board is connected to a PID temperature regulator.

[0073] Thermocouples collect temperature data from the ceramic induction cooker, and the PID temperature regulator transmits the temperature data to the CBM13 / DX inverter board. The CBM13 / DX inverter board then controls the inverter trigger board to generate corresponding trigger signals based on the temperature data, thereby controlling the first and second thyristor half-bridge inverter circuits in the SCR half-bridge inverter module to output the corresponding power for operation.

[0074] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A series half-bridge SCR resonant power supply for ceramic induction cookers, characterized in that: It includes a three-phase electrical interface, an input filter module, an SCR phase-controlled rectifier module, a DC reactor filter module, a capacitor filter module, and an SCR half-bridge inverter module connected in sequence. The SCR phase-controlled rectifier module is equipped with a rectifier control module; The SCR half-bridge inverter module is connected to the induction coil of the ceramic induction cooker. The SCR half-bridge inverter module is equipped with an inverter control module, which is connected to the thermocouple inside the ceramic induction cooker through a PID temperature regulator.

2. The series half-bridge SCR resonant power supply for ceramic induction cookers according to claim 1, characterized in that: The SCR half-bridge inverter module includes capacitors Cs1 and Cs2 with the same capacitance value. One end of capacitor Cs1 and one end of capacitor Cs2 are both connected to one end of the induction coil. A first thyristor half-bridge inverter circuit is provided between the other end of capacitor Cs1 and the other end of induction coil. A second thyristor half-bridge inverter circuit is provided between the other end of capacitor Cs2 and the other end of the induction coil. The first and second thyristor half-bridge inverter circuits are respectively connected in parallel with a first surge voltage absorption circuit and a second surge voltage absorption circuit.

3. The series half-bridge SCR resonant power supply for ceramic induction cookers according to claim 2, characterized in that: The first thyristor half-bridge inverter circuit includes an SCR device T7, the anode of the SCR device T7 is connected to one end of the inductor LP1 and the cathode of the diode ZK1; The other end of the inductor LP1 is connected to the other end of the capacitor Cs1; The anode of the diode ZK1 is connected to the cathode of the SCR device T7, and the cathode of the SCR device T7 is connected to the other end of the induction coil. The gate of the SCR device T7 is connected to the inverter control module; The second thyristor half-bridge inverter circuit includes an SCR device T8, the anode of which is connected to the cathode of diode ZK2, the other end of the induction coil, and the cathode of SCR device T7. The anode of diode ZK2 is connected to the cathode of SCR device T8, the cathode of SCR device T8 is connected to one end of inductor LP2, and the other end of inductor LP2 is connected to the other end of capacitor Cs2. The gate of the SCR device T8 is connected to the inverter control module.

4. The series half-bridge SCR resonant power supply for ceramic induction cookers according to claim 3, characterized in that: The first surge voltage absorption circuit includes a diode Zx1. The anode of the diode Zx1 is connected to the anode of the SCR device T7, and the cathode of the diode Zx1 is connected to one end of the resistor Rx_1. The other end of the resistor Rx_1 is connected to the cathode of the SCR device T7 through a capacitor Cx1. The second surge voltage absorption circuit includes a diode Zx2. The anode of the diode Zx2 is connected to the anode of the SCR device T8, and the cathode of the diode Zx2 is connected to one end of the resistor Rx_2. The other end of the resistor Rx_2 is connected to the cathode of the SCR device T8 through the capacitor Cx2.

5. The series half-bridge SCR resonant power supply for ceramic induction cookers according to claim 4, characterized in that: Resistors Rb1 and Rb2 are connected in parallel across the two ends of SCR device T7 and SCR device T8, respectively.

6. The series half-bridge SCR resonant power supply for ceramic induction cookers according to claim 1, characterized in that: The SCR phase-controlled rectifier module includes an A-phase SCR phase-controlled rectifier module, a B-phase SCR phase-controlled rectifier module, and a C-phase SCR phase-controlled rectifier module, which are respectively connected to the A-phase, B-phase, and C-phase of the three-phase electrical interface. The A-phase SCR phase-controlled rectifier module includes SCR devices T2 and T5; the cathode of SCR device T2 and the anode of SCR device T5 are connected to phase A. A resistor R2 and a capacitor C2 are connected in series between the anode and cathode of SCR device T2; a resistor R5 and a capacitor C5 are connected in series between the anode and cathode of SCR device T5. The B-phase SCR phase-controlled rectifier module includes SCR devices T3 and T6; the cathode of SCR device T6 and the anode of SCR device T3 are connected to the B phase. A resistor R3 and a capacitor C3 are connected in series between the anode and cathode of SCR device T3; a resistor R6 and a capacitor C6 are connected in series between the anode and cathode of SCR device T6. The C-phase SCR phase-controlled rectifier module includes SCR devices T1 and T4; the cathode of SCR device T4 and the anode of SCR device T1 are connected to the C phase. A resistor R1 and a capacitor C1 are connected in series between the anode and cathode of SCR device T1; a resistor R4 and a capacitor C4 are connected in series between the anode and cathode of SCR device T4. The cathodes of the SCR devices T1, T3, and T5 are all connected to the DC reactor filter module. The anodes of the SCR devices T2, T4, and T6 are all connected to the DC reactor filter module; The gates of the SCR devices T1, T2, T3, T4, T5, and T6 are all connected to the rectifier control module.

7. The series half-bridge SCR resonant power supply for ceramic induction cookers according to claim 6, characterized in that: The DC reactor filter module includes an inductor Ld with one end connected to the cathode of SCR devices T1, T3, and T5; The other end of the inductor Ld is connected to the anode of the diode ZP, and the cathode of the diode ZP is connected to the capacitor filter module.

8. The series half-bridge SCR resonant power supply for ceramic induction cookers according to claim 6, characterized in that: The input filtering module includes inductors La, Lb, and Lc connected in series with phases A, B, and C of the three-phase electrical interface, respectively.

9. The series half-bridge SCR resonant power supply for ceramic induction cookers according to claim 7, characterized in that: The capacitor filter module includes a capacitor Cd, and the two ends of the capacitor Cd are connected to the cathode of diode ZP and the anode of SCR devices T2, T4 and T6, respectively. Resistors R11_1, R11_2, and R11_3 are connected in parallel across the capacitor Cd.

10. The series half-bridge SCR resonant power supply for ceramic induction cookers according to claim 1, 3, or 6, characterized in that: The rectification control module is a ZL6M-DX rectifier board; The ZL6M-DX rectifier board is connected to the gates of SCR devices T1, T2, T3, T4, T5, and T6; The inverter control module includes an inverter trigger board and a CBM13 / DX inverter board connected to the inverter trigger board. The inverter trigger board is connected to the gates of SCR devices T7 and T8; The CBM13 / DX inverter board is connected to the PID temperature regulator.

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