CN107070218B - High-power soft switch chopper circuit - Google Patents
High-power soft switch chopper circuit Download PDFInfo
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- CN107070218B CN107070218B CN201710345982.1A CN201710345982A CN107070218B CN 107070218 B CN107070218 B CN 107070218B CN 201710345982 A CN201710345982 A CN 201710345982A CN 107070218 B CN107070218 B CN 107070218B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention relates to the field of induction heating power supplies, and discloses a high-power soft switch chopper circuit, which comprises a soft switch chopper module, a transformer T1, high-frequency rectification semiconductor devices D7, D8, D9 and D10, a reactor L2 and a capacitor C3, wherein the soft switch chopper module is electrically connected with the reactor L2 and the capacitor C3 through the transformer T1, and a bridge circuit consists of the high-frequency rectification semiconductor devices D7, D8, D9 and D10; the soft switch chopper circuit has the advantages that the power factor of the power grid side is improved, the pollution to the power grid is reduced, the loss of the power device in the switching process is greatly reduced, the ideal state is almost zero, and the power capacity can be increased in various modes of parallel connection of a plurality of soft switch chopper modules, series connection and parallel operation of transformer output and the like.
Description
Technical Field
The invention belongs to the field of induction heating power supplies, and relates to a soft switch chopper circuit of a high-power induction heating power supply.
Background
The induction heating power supply utilizes eddy current to heat according to the electromagnetic induction principle and the Joule-Lenz theorem, and has the advantages of high heating speed, high efficiency, high automation range, energy conservation and environmental protection. The development of the induction heating power supply technology is closely related to the development of the power semiconductor device, and the induction heating power supply is driven to have larger capacity and higher frequency along with the larger capacity and higher frequency of the power device.
At present, the output power of the parallel resonance type induction heating power supply is mainly regulated by regulating the voltage of a direct current side, and the direct current side power regulation mainly comprises two major types of thyristor phase control rectification voltage regulation and power regulation and direct current chopper voltage regulation and power regulation.
The thyristor phase control rectification technology is to continuously adjust the output voltage value by adjusting the conduction angle of the thyristor, so as to realize the power adjustment of the system. The power regulating mode is mature and has low cost. However, under the condition of larger control angle, the thyristor phase control rectification voltage regulating circuit has low input power factor, the input current waveform is spike pulse, the harmonic content is high, and larger pollution is formed to the power grid. And the EMI of the thyristor rectifying voltage regulating circuit is very large, and the peripheral electrical equipment and the control circuit thereof are greatly disturbed.
The direct-current chopping voltage and power regulation means that a step-down chopper circuit is adopted at the side of a direct-current bus, and direct-current output voltage is regulated by changing the duty ratio, so that the regulation of output power is realized. The main circuit of the power regulating mode adopts a diode uncontrollable rectifying circuit, and compared with a thyristor phase control rectifying circuit, the power factor of the power grid side is improved, and the pollution to the power grid is reduced. However, the on and off of the power switching device in the Buck circuit belongs to a hard switch, and in the switching process, the voltage and current overlapping time exists on the device, so that the switching loss is relatively large, and the power switching device is not suitable for being applied to a high-frequency and large-capacity system.
Disclosure of Invention
Along with the development of induction heating power supply toward high frequency and large capacity, the invention discloses a high-power soft switch chopper circuit in order to fully exert the advantages of a direct current voltage and power regulating circuit and overcome the disadvantages.
The invention adopts the technical proposal for solving the problems that:
a high-power soft switch chopper circuit comprises a soft switch chopper module, a transformer T1, high-frequency rectification semiconductor devices D7, D8, D9 and D10, a reactor L2 and a capacitor C3, wherein the soft switch chopper module is electrically connected with the reactor L2 and the capacitor C3 through the transformer T1, and a bridge circuit is composed of the high-frequency rectification semiconductor devices D7, D8, D9 and D10;
the soft switch chopper module is formed by electrically connecting a three-phase rectifier with a resonance H bridge through a reactor L1, a direct current contactor KM1 and a capacitor C1, wherein the resonance H bridge consists of MOS tubes Q1, Q2, Q3 and Q4, rectifying tubes DQ1, DQ2, DQ3 and DQ4, capacitors CQ1, CQ2 and Cb and a transformer T1, and one path of the soft switch chopper module is formed by connecting the output end of one MOS tube Q1 with the output end of the other MOS tube Q2 in series through a parallel circuit of the rectifying tube DQ1 and the capacitor CQ 1; the output end formed by electrically connecting the series point a through a capacitor Cb and a transformer leakage inductance L1k is one end of an H-bridge output voltage Uinv; the other route is formed by connecting the output end of one MOS tube Q3 with the output end of one MOS tube Q4 in series through a rectifying tube DQ3 series circuit and then connecting the output end of one MOS tube Q3 with the output end of one MOS tube Q4 in series through a rectifying tube DQ4 series circuit; the output end of the series point b is the other end of the H-bridge output voltage Uinv; forming a full-bridge soft switch chopper module; the two ends of the capacitor C1 are connected with a Hall voltage sensor CHV1, and a Hall current sensor CHK1 is connected between the direct current contactor KM1 and the capacitor C1.
The MOS transistors Q1, Q2, Q3 and Q4 are replaced by thyristors and IGBT; wherein the Q1 gate-source drive signal connection G1, E1, the Q2 gate-source drive signal connection G2, E2, the Q3 gate-source drive signal connection G3, E3, the Q4 gate-source drive signal connection G4, E4.
A high-power soft switching chopper circuit is characterized in that 15V+ and 15V-of a power supply end CHV1 of a Hall voltage sensor are connected with an external power supply +15V and 15V; the sampling terminals DCVP and DCVN sample the output voltage signal.
A high-power soft switch chopper circuit, a plurality of soft switch chopper modules are electrically connected with a transformer to form the soft switch chopper circuit, wherein the transformer comprises: and the single transformer primary winding is output by a plurality of secondary windings, the plurality of secondary windings are output in series, and the plurality of secondary windings are output in parallel.
The first type is formed by connecting the output ends of a plurality of soft switch chopper modules with primary multi-windings corresponding to single secondary single-winding and primary multi-winding transformers respectively;
the second type is formed by connecting the output ends of a plurality of soft switch chopper modules with corresponding primary windings of a plurality of transformers which are connected in series with the secondary windings of the one-to-one winding transformers;
the third type is formed by connecting the output ends of a plurality of soft switch chopper modules with corresponding primary windings of a plurality of transformers which are connected in parallel with the secondary windings of the one-to-one winding transformers.
A working method of a high-power soft switch chopper circuit comprises the steps that a three-phase uncontrolled rectifying circuit formed by rectifying diodes D1, D2, D3 and D4 changes power frequency three-phase alternating current into pulsating direct current, and a reactor L1 limits the secondary value of the direct current pulsation after rectification to enable the secondary value to be smooth direct current;
during starting, the direct current contactor and the capacitor C1 form a soft starting loop, the voltage Ud1 of the resonant H-bridge direct current bus slowly rises, and current impact in the starting process is reduced;
when the switching tubes Q1, Q4 or Q2, Q3 are simultaneously conducted, the primary side of the transformer provides energy for the load; through phase shift control, Q4 is not turned off immediately when Q1 is turned off, but a phase shift angle is determined according to an output feedback signal, and then Q4 is turned off after a certain time, and before Q1 is turned off, the voltage on a parallel capacitor CQ1 is equal to the conduction voltage drop of Q1 due to the conduction of Q1, and the value is zero under ideal conditions;
when the Q1 is turned off, CQ1 starts to charge, and as the capacitor voltage cannot be suddenly changed, Q1 is turned off at zero voltage; due to the leakage inductance L1k of the transformer and the effect of the secondary side rectifying and filtering inductance, after Q1 is turned off, primary side current cannot be suddenly changed, cb is continuously charged, and CQ2 is discharged through the primary side;
when the voltage of the CQ2 is reduced to zero, the DQ2 is naturally conducted, and then the Q2 is turned on, namely, the zero voltage is turned on;
when CQ1 is fully charged and CQ2 is discharged, because DQ2 is conducted, the voltage applied to the primary winding and leakage inductance of the transformer is the voltage at two ends of a blocking capacitor Cb, the primary current starts to decrease, but Cb is continuously charged until the primary current is zero, and because of the blocking effect of DQ4, the capacitor Cb cannot be discharged through Q2, Q4 and DQ4, the voltage at two ends of Cb is kept unchanged, the current flowing through Q4 is zero, and the turn-off Q4 is zero current turn-off;
the full-bridge soft-switching chopper module is composed of Q1, Q2, Q3, Q4, DQ1, DQ2, DQ3, DQ4, CQ1, CQ2, cb and a transformer T1, so that the loss of a switching tube when the switching tube is switched on and off is greatly reduced, and the efficiency of the soft-switching chopper is improved;
the soft switch chopper module adjusts the output voltage Uinv of the H bridge in a phase-shifting voltage-regulating mode, and the secondary side of the transformer outputs smooth and controllable direct-current voltage Ud2 through an uncontrolled full-bridge rectifying and LC filter circuit; wherein G1 and E1 are connected with Q1 grid source electrode driving signals, G2 and E2 are connected with Q2 grid source electrode driving signals, G3 and E3 are connected with Q3 grid source electrode driving signals, and G4 and E4 are connected with Q4 grid source electrode driving signals.
By adopting the technical scheme, the invention has the following advantages:
a high-power soft switch chopper circuit improves the power factor at the side of a power grid, reduces the pollution to the power grid, greatly reduces the loss in the switching process of a power device, has almost zero ideal state, and can increase the power supply capacity by a plurality of modes of parallel connection of a plurality of soft switch chopper modules, serial connection and parallel operation of transformer outputs and the like.
Drawings
Fig. 1 is a schematic diagram of a soft-switching chopper module.
Fig. 2 is a schematic diagram of a single soft-switching chopper circuit, single output transformer primary single winding, secondary single winding output.
Fig. 3 is a schematic diagram of multiple soft switching chopper circuits connected in parallel, multiple output transformers primary multi-winding, secondary single winding output.
Fig. 4 is a schematic diagram of a series output of a plurality of output transformer secondary windings with a plurality of soft switching chopper circuits connected in parallel.
Fig. 5 is a schematic diagram of a parallel output of multiple output transformer secondary windings with multiple soft-switching chopper circuits in parallel.
Fig. 6 is a key node waveform diagram.
Detailed Description
As shown in fig. 1, 2, 3, 4, 5 and 6, the high-power soft-switching chopper circuit comprises a soft-switching chopper module, a transformer T1, high-frequency rectification semiconductor devices D7, D8, D9 and D10, a reactor L2 and a capacitor C3, wherein the soft-switching chopper module is electrically connected with the reactor L2 and the capacitor C3 through the transformer T1, and the bridge circuit is composed of high-frequency rectification semiconductor devices D7, D8, D9 and D10;
the soft switch chopper module is formed by electrically connecting a three-phase rectifier with a resonance H bridge through a reactor L1, a direct current contactor KM1 and a capacitor C1, wherein the resonance H bridge consists of MOS tubes Q1, Q2, Q3 and Q4, rectifying tubes DQ1, DQ2, DQ3 and DQ4, capacitors CQ1, CQ2 and Cb and a transformer T1, and one path of the soft switch chopper module is formed by connecting the output end of one MOS tube Q1 with the output end of the other MOS tube Q2 in series through a parallel circuit of the rectifying tube DQ1 and the capacitor CQ 1; the output end formed by electrically connecting the series point a through a capacitor Cb and a transformer leakage inductance L1k is one end of an H-bridge output voltage Uinv; the other route is formed by connecting the output end of one MOS tube Q3 with the output end of one MOS tube Q4 in series through a rectifying tube DQ3 series circuit and then connecting the output end of one MOS tube Q3 with the output end of one MOS tube Q4 in series through a rectifying tube DQ4 series circuit; the output end of the series point b is the other end of the H-bridge output voltage Uinv; forming a full-bridge soft switch chopper module; the two ends of the capacitor C1 are connected with a Hall voltage sensor CHV1, and a Hall current sensor CHK1 is connected between the direct current contactor KM1 and the capacitor C1.
In fig. 1, a three-phase uncontrolled rectifying circuit composed of rectifying diodes D1, D2, D3, D4 converts a power frequency three-phase alternating current into a pulsating direct current, and a reactor L1 limits a secondary value of the direct current pulsation after rectification to make it a smooth direct current. During starting, the direct current contactor and the capacitor C1 form a soft starting loop, the voltage Ud1 of the resonant H-bridge direct current bus slowly rises, and current impact in the starting process is reduced.
When the switching tubes Q1, Q4 or Q2, Q3 are simultaneously turned on, the primary side of the transformer provides energy to the load. By the phase shift control, Q4 is not turned off immediately when Q1 is turned off, but the phase shift angle is determined according to the output feedback signal, and Q4 is turned off after a certain time, before Q1 is turned off, the voltage on the parallel capacitor CQ1 is equal to the on voltage drop of Q1 due to Q1 being turned on, and the value is zero under ideal conditions, when Q1 is turned off, CQ1 starts to charge, and because the capacitor voltage cannot be suddenly changed, Q1 is turned off with zero voltage. Due to the leakage inductance L1k of the transformer and the effect of the secondary side rectifying and filtering inductance, after Q1 is turned off, primary side current cannot be suddenly changed, cb is continuously charged, CQ2 is discharged through the primary side, after the voltage of the CQ2 is reduced to zero, DQ2 is naturally turned on, and then Q2 is turned on at zero voltage. When CQ1 is fully charged and CQ2 is discharged, since DQ2 is conducted, the voltage applied to the primary winding and leakage inductance of the transformer is the voltage across the blocking capacitor Cb, the primary current starts to decrease, but Cb is continuously charged until the primary current is zero, and since DQ4 is blocked, the capacitor Cb cannot be discharged through Q2, Q4 and DQ4, the voltage across Cb remains unchanged, and the current flowing through Q4 is zero, and the turn-off Q4 is zero current turn-off.
Q1, Q2, Q3, Q4, DQ1, DQ2, DQ3, DQ4, CQ1, CQ2, cb and transformer T1, the loss of the switching tube when being switched on and off is greatly reduced, and the efficiency of the soft switching chopper is improved. The soft switch chopper module adjusts the output voltage Uinv of the H bridge in a phase-shifting voltage-regulating mode, and the secondary side of the transformer outputs smooth and controllable direct-current voltage Ud2 through an uncontrolled full-bridge rectifying and LC filter circuit. G1 and E1 are connected with Q1 grid source electrode driving signals, G2 and E2 are connected with Q2 grid source electrode driving signals, G3 and E3 are connected with Q3 grid source electrode driving signals, and G4 and E4 are connected with Q4 grid source electrode driving signals.
In fig. 2, a single soft-switching chopper module is connected to a single transformer primary winding, a secondary single winding output, and each soft-switching chopper module embodiment is the same as described in fig. 1.
In fig. 3, a plurality of soft switching chopper modules are connected to a plurality of primary windings of a single transformer, respectively, and a secondary single winding is output, and each soft switching chopper module is implemented as described in fig. 1.
In fig. 4, a plurality of soft-switching chopper modules are connected in parallel, and a plurality of output transformer secondary windings are output in series, each soft-switching chopper module embodiment being the same as described in fig. 1.
In fig. 5, a plurality of soft switching chopper modules are connected in parallel, and a plurality of output transformer secondary windings are connected in parallel for output, each soft switching chopper module embodiment being the same as described in fig. 1.
In fig. 6, uab represents the voltage between points a and b in fig. 1, ucb is the voltage across blocking capacitor Ub, ip is the primary current of transformer T1 in fig. 2, and Urect is the voltage after secondary rectification of transformer T1.
The models T1, T2, T3 and T4 are power thyristors MTC500Y12; model U1A, U1B, U2A, U B are monostable flip-flops CD4098, model U3 is CD4001, model U4 is CD4081, model U5 is CD4071, and model U6 is CD4011; the model can also adopt the alternative model with the same function, and belongs to the same invention.
Claims (4)
1. A working method of a high-power soft switch chopper circuit is characterized in that the adopted high-power soft switch chopper circuit is characterized in that: the high-frequency rectifier circuit comprises a soft switch chopper module, a transformer T1, high-frequency rectifier semiconductor devices D7, D8, D9 and D10, a reactor L2 and a capacitor C3, wherein the soft switch chopper module is electrically connected with the reactor L2 and the capacitor C3 through the transformer T1, and a bridge circuit consists of the high-frequency rectifier semiconductor devices D7, D8, D9 and D10;
the soft switch chopper module is formed by electrically connecting a three-phase rectifier with a resonance H bridge through a reactor L1, a direct current contactor KM1 and a capacitor C1, wherein the resonance H bridge consists of MOS tubes Q1, Q2, Q3 and Q4, rectifying tubes DQ1, DQ2, DQ3 and DQ4, capacitors CQ1, CQ2 and Cb and a transformer T1, and one path of the soft switch chopper module is formed by connecting the output end of one MOS tube Q1 with the output end of the other MOS tube Q2 in series through a parallel circuit of the rectifying tube DQ1 and the capacitor CQ 1; the output end formed by electrically connecting the series point a through a capacitor Cb and a transformer leakage inductance L1k is one end of an H-bridge output voltage Uinv; the other route is formed by connecting the output end of one MOS tube Q3 with the output end of one MOS tube Q4 in series through a rectifying tube DQ3 series circuit and then connecting the output end of one MOS tube Q3 with the output end of one MOS tube Q4 in series through a rectifying tube DQ4 series circuit; the output end of the series point b is the other end of the H-bridge output voltage Uinv; forming a full-bridge soft switch chopper module; the two ends of the capacitor C1 are connected with a Hall voltage sensor CHV1, and a Hall current sensor CHK1 is connected between the direct current contactor KM1 and the capacitor C1; the three-phase uncontrolled rectifying circuit formed by the rectifying diodes D1, D2, D3 and D4 changes the power frequency three-phase alternating current into pulsating direct current, and the reactor L1 limits the secondary value of the direct current pulsation after rectification to enable the secondary value to be smooth direct current;
during starting, the direct current contactor and the capacitor C1 form a soft starting loop, the voltage Ud1 of the resonant H-bridge direct current bus slowly rises, and current impact in the starting process is reduced;
when the switching tubes Q1, Q4 or Q2, Q3 are simultaneously conducted, the primary side of the transformer provides energy for the load; through phase shift control, Q4 is not turned off immediately when Q1 is turned off, but a phase shift angle is determined according to an output feedback signal, and then Q4 is turned off after a certain time, and before Q1 is turned off, the voltage on a parallel capacitor CQ1 is equal to the conduction voltage drop of Q1 due to the conduction of Q1, and the value is zero under ideal conditions;
when the Q1 is turned off, CQ1 starts to charge, and as the capacitor voltage cannot be suddenly changed, Q1 is turned off at zero voltage; due to the leakage inductance L1k of the transformer and the effect of the secondary side rectifying and filtering inductance, after Q1 is turned off, primary side current cannot be suddenly changed, cb is continuously charged, and CQ2 is discharged through the primary side;
when the voltage of the CQ2 is reduced to zero, the DQ2 is naturally conducted, and then the Q2 is turned on, namely, the zero voltage is turned on;
when CQ1 is fully charged and CQ2 is discharged, because DQ2 is conducted, the voltage applied to the primary winding and leakage inductance of the transformer is the voltage at two ends of a blocking capacitor Cb, the primary current starts to decrease, but Cb is continuously charged until the primary current is zero, and because of the blocking effect of DQ4, the capacitor Cb cannot be discharged through Q2, Q4 and DQ4, the voltage at two ends of Cb is kept unchanged, the current flowing through Q4 is zero, and the turn-off Q4 is zero current turn-off;
q1, Q2, Q3, Q4, DQ1, DQ2, DQ3, DQ4, CQ1, CQ2, cb and transformer T1 form a full-bridge soft switching chopper module, so that the loss of a switching tube when the switching tube is switched on and off is reduced, and the efficiency of the soft switching chopper is improved;
the soft switch chopper module adjusts the output voltage Uinv of the H bridge in a phase-shifting voltage-regulating mode, and the secondary side of the transformer outputs smooth and controllable direct-current voltage Ud2 through an uncontrolled full-bridge rectifying and LC filter circuit; wherein G1 and E1 are connected with Q1 grid source electrode driving signals, G2 and E2 are connected with Q2 grid source electrode driving signals, G3 and E3 are connected with Q3 grid source electrode driving signals, and G4 and E4 are connected with Q4 grid source electrode driving signals.
2. The method for operating a high power soft switching chopper circuit of claim 1, wherein: the MOS transistors Q1, Q2, Q3 and Q4 are replaced by thyristors and IGBT; wherein the Q1 gate-source drive signal connection G1, E1, the Q2 gate-source drive signal connection G2, E2, the Q3 gate-source drive signal connection G3, E3, the Q4 gate-source drive signal connection G4, E4.
3. The working method of the high-power soft switch chopper circuit according to claim 1, wherein 15V+, 15V-of a power supply end CHV1 of the Hall voltage sensor is connected with an external power supply +15V and 15V; the sampling ends DCVP and DCVN are sampling output voltage signals, and 15V+ and 15V-of the Hall current sensor CHK1 are connected with an external power supply +15V and 15V; DCIP, DCIN are sampled output current signals.
4. The method for operating a high power soft switching chopper circuit of claim 1, wherein: the soft switch chopper circuit is formed by electrically connecting a plurality of soft switch chopper modules with a transformer, wherein the transformer comprises: a single transformer primary multi-winding secondary single-winding output, a plurality of transformer secondary windings output in series, and a plurality of transformer secondary windings output in parallel;
the first type is formed by connecting the output ends of a plurality of soft switch chopper modules with primary multi-windings corresponding to single secondary single-winding and primary multi-winding transformers respectively;
the second type is formed by connecting the output ends of a plurality of soft switch chopper modules with corresponding primary windings of a plurality of transformers which are connected in series with the secondary windings of the one-to-one winding transformers;
the third type is formed by connecting the output ends of a plurality of soft switch chopper modules with corresponding primary windings of a plurality of transformers which are connected in parallel with the secondary windings of the one-to-one winding transformers.
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| CN109659195B (en) * | 2019-01-07 | 2019-12-17 | 福州大学 | Soft start control method for multi-winding electromagnetic mechanism contactor |
| CN116722752B (en) * | 2023-08-04 | 2023-10-03 | 泉州艾奇科技有限公司 | Chopper step-down module and chopper step-down circuit |
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