CN107070218A - A kind of high-power soft switchs chopper circuit - Google Patents
A kind of high-power soft switchs chopper circuit Download PDFInfo
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- CN107070218A CN107070218A CN201710345982.1A CN201710345982A CN107070218A CN 107070218 A CN107070218 A CN 107070218A CN 201710345982 A CN201710345982 A CN 201710345982A CN 107070218 A CN107070218 A CN 107070218A
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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
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Abstract
The present invention relates to induction heating power field, a kind of disclosed high-power soft switch chopper circuit, including Sofe Switch copped wave module, transformer T1, high-frequency rectification semiconductor devices D7, D8, D9, D10, reactor L2, capacitor C3, it is electrically connected to form by Sofe Switch copped wave module by transformer T1, with reactor L2, capacitor C3, bridge circuit is made up of high-frequency rectification semiconductor devices D7, D8, D9, D10；Described Sofe Switch copped wave module is electrically connected to form by three-phase rectifier by reactor L1, D.C. contactor KM1, capacitor C1 and resonance H bridges, the present invention improves grid side power factor, reduce the pollution to power network, Sofe Switch chopper circuit, the loss of power device switching process is greatly reduced, perfect condition is almost nil, can increase power supply capacity by the way that multiple Sofe Switch copped wave wired in parallel, transformer are exported into the various ways such as series, parallel operation.
Description
Technical field
The invention belongs to induction heating power field, a kind of high-power induction heating power for being related to induction heating power soft is opened
Close chopper circuit.
Background technology
Induction heating power is, according to electromagnetic induction principle and joule-Lenz's theorem, to be heated using being vortexed, heating
Speed is fast, efficiency high, and automation journey is high, energy-conserving and environment-protective.The development of induction heating power technology and the hair of power semiconductor
Closely related, high capacity, high frequency with power device are opened up, and then has driven the high capacity and height of induction heating power
Frequencyization.
At present, the regulation of Parallel Resonant induction heating power power output is mainly by adjusting DC voltage come real
Existing, DC side Power Regulation mainly has the Power Regulation of Thyristor Controlled rectifying and pressure-regulating and the major class of DC chopped-wave voltage-regulating Power Regulation two.
Thyristor Controlled commutation technique refers to the angle of flow by adjusting IGCT, makes its output voltage values continuously adjustabe,
The power adjusting of system is realized, it is general to use three-phase bridge phase control rectifier circuit in induction heating system.This Power Regulation mode
Comparative maturity, cost is relatively low.But, Thyristor Controlled regulator rectifier circuit is in the case where pilot angle is larger, input work
Rate factor is very low, and input current waveform is spike, and harmonic content is very high, and larger pollution is formd to power network.And it is brilliant
The EMI of brake tube regulator rectifier circuit is very big, and the electrical equipment and the control circuit of itself to periphery will produce larger interference.
DC chopped-wave voltage-regulating Power Regulation refers to use buck circuit in dc bus side, by the size for changing dutycycle
To adjust VD, the regulation to power output is realized.The main circuit of the Power Regulation mode is uncontrollable whole using diode
Current circuit, compares with Thyristor Controlled rectification circuit and improves grid side power factor, reduces the pollution to power network.But
Switching on and off for device for power switching in Buck circuits belongs to hard switching, exist in switching process, on device voltage and
The current superimposition time, switching loss is than larger, so being unsuitable for applying in high frequency and hicap.
The content of the invention
Direction with induction heating power towards high frequency and high capacity is developed, and is adjusted to give full play to direct current voltage reulation
The advantage of work(circuit, while overcoming its shortcoming, the present invention discloses a kind of high-power soft switch chopper circuit.
The present invention is for the used technical scheme that solves the above problems：
A kind of high-power soft switchs chopper circuit, including Sofe Switch copped wave module, transformer T1, high-frequency rectification semiconductor devices
D7, D8, D9, D10, reactor L2, capacitor C3, transformer T1 and reactor L2, capacitor are passed through by Sofe Switch copped wave module
C3 is electrically connected to form, and bridge circuit is made up of high-frequency rectification semiconductor devices D7, D8, D9, D10；
Described Sofe Switch copped wave module passes through reactor L1, D.C. contactor KM1, capacitor C1 and resonance by three-phase rectifier
H bridges are electrically connected to form, the resonance H bridges by metal-oxide-semiconductor Q1, Q2, Q3, Q4, rectifying tube DQ1, DQ2, DQ3, DQ4, electric capacity CQ1,
CQ2, Cb and transformer T1 compositions, one route a metal-oxide-semiconductor Q1 output end by rectifying tube DQ1, electric capacity CQ1 parallel circuit,
It is in series again by rectifying tube DQ2, electric capacity CQ2 parallel circuit with another metal-oxide-semiconductor Q2 output ends；Series connection point a passes through
The output end that electric capacity Cb, transformer leakage inductance L1k are electrically connected to form is H bridge output voltage Uinv one end；One metal-oxide-semiconductor of another route
Q3 output ends are connected again by rectifying tube DQ3 series circuits with a metal-oxide-semiconductor Q4 output end by rectifying tube DQ4 series circuits
Constitute；Series connection point b output end is the H bridge output voltage Uinv other ends；Constitute full-bridge soft-switching copped wave module；Wherein electric capacity
Device C1 two ends are connected with Hall voltage sensor CHV1, and Hall current is connected between D.C. contactor KM1 and capacitor C1
Sensor CHK1.
A kind of high-power chopping switch circuit, described metal-oxide-semiconductor Q1, Q2, Q3, Q4 or replaces with IGCT, IGBT；Wherein
Q1 grid source drives signal connection G1, E1, Q2 grid source drives signal connection G2, E2, Q3 grid source drives signal connection G3,
E3, Q4 grid source drive signal connect G4, E4.
A kind of high-power soft switchs chopper circuit, and described Hall voltage sensor power end CHV1 15V+, 15V- connect
Meet external power source+15V, -15V；Sampling end DCVP, DCVN are sampling and outputting voltage signal.
A kind of high-power soft switchs chopper circuit, and several described Sofe Switch copped wave modules electrically connect composition with transformer
Sofe Switch chopper circuit, transformer therein includes：The secondary simplex winding output of single transformer primary Multiple coil, multiple transformations
The series connection output of device secondary windings, multiple transformer secondary output winding parallel outputs.
The first by several Sofe Switch copped wave modules output end respectively with single secondary simplex winding, primary Multiple coil
The corresponding primary Multiple coil of transformer, which is connected, to be constituted；
Second of output end by several Sofe Switch copped wave modules respectively with multiple one to one winding transformer secondary windings strings
The corresponding armature winding of transformer of connection, which is connected, to be constituted；
The third by several Sofe Switch copped wave modules output end respectively with multiple one to one winding transformer secondary windings simultaneously
The corresponding armature winding of transformer of connection, which is connected, to be constituted.
A kind of high-power soft switchs the method for work of chopper circuit, and the three-phase of commutation diode D1, D2, D3, D4 composition is not
Control rectifying circuit, power frequency three-phase alternating current is changed into the direct current of pulsation, the secondary value of DC pulse, makes after reactor L1 limitation rectifications
It is changed into smooth direct current；
During startup, D.C. contactor slowly rises with capacitor C1 formation soft starts loop, resonance H bridge DC bus-bar voltages Ud1,
Reduce the rush of current in start-up course；
When switching tube Q1, Q4 or Q2, Q3 are simultaneously turned on, transformer primary side provides energy to load；By phase shifting control, closing
Q4 is not turned off during disconnected Q1 at once, but phase shifting angle is determined according to output feedback signal, Q4 is turned off again after certain time,
Turn off before Q1, due to Q1 conductings, voltage is equal to Q1 conduction voltage drop on its shunt capacitance CQ1, and ideally its value is zero；
When the shut-off Q1 moment, CQ1 is started to charge up, because capacitance voltage can not be mutated, and therefore, Q1 is zero voltage turn-off；Due to
Transformer leakage inductance L1k and secondary rectifying and wave-filtering inductance effect, after Q1 shut-offs, primary current can not be mutated, and continue to fill to Cb
Electricity, while CQ2 discharges also by primary side；
After CQ2 voltages drop to zero, DQ2 is turned on naturally, at this moment opens Q2, then Q2 is that no-voltage is open-minded；
When CQ1 is fully charged, CQ2 discharge offs after, because DQ2 is conducting, be now added in transformer primary side winding and leakage inductance
Voltage be blocking capacitor Cb both end voltages, primary current starts to reduce, but continues to give Cb chargings, until primary current is zero,
At this moment due to DQ4 blocking effect, electric capacity Cb can not be discharged by Q2, Q4, DQ4, and Cb both end voltages remain unchanged, at this moment
It is zero to flow through Q4 electric currents, and shut-off Q4 is zero-current switching；
Q1, Q2, Q3, Q4, DQ1, DQ2, DQ3, DQ4, CQ1, CQ2, Cb and transformer T1 compositions full-bridge soft-switching copped wave module,
Loss when switching tube is turned on and off is greatly reduced, the efficiency of the Sofe Switch chopper is improved from face；
The Sofe Switch copped wave module adjusts H bridge output voltage Uinv by phase-shift voltage regulating mode, and transformer secondary is complete by not controlling
Bridge rectification, LC filter circuits, the controllable DC voltage Ud2 of output smoothing；Wherein G1, E1 connect Q1 grid source drive signals, G2, E2
Q2 grid source drive signals are connect, G3, E3 connect Q3 grid source drive signals, and G4, E4 connect Q4 grid source drive signals.
Due to using technical scheme as described above, the present invention has following superiority：
A kind of high-power soft switchs chopper circuit, improves grid side power factor, reduces the pollution to power network, Sofe Switch is cut
Wave circuit, power device switching process loss is greatly reduced, and perfect condition is almost nil, can be by by multiple Sofe Switch copped wave moulds
The various ways increase power supply capacitys such as block is in parallel, transformer output series, parallel operation.
Brief description of the drawings
Fig. 1 is the schematic diagram of Sofe Switch copped wave module.
Fig. 2 is single Sofe Switch chopper circuit, single output primary simplex winding, secondary simplex winding output principle
Figure.
Fig. 3 is that multiple Sofe Switch chopper circuits are in parallel, and multiple output primary Multiple coils, secondary simplex winding output are former
Reason figure.
Fig. 4 is that multiple Sofe Switch chopper circuits are in parallel, multiple output transformer secondary output windings in series output principle figures.
Fig. 5 is that multiple Sofe Switch chopper circuits are in parallel, multiple output transformer secondary output winding parallel output principle figures.
Fig. 6 is key node oscillogram.
Embodiment
As shown in Fig. 1,2,3,4,5,6, a kind of high-power soft switchs chopper circuit, including Sofe Switch copped wave module, transformation
Device T1, high-frequency rectification semiconductor devices D7, D8, D9, D10, reactor L2, capacitor C3, by Sofe Switch copped wave module by becoming
Depressor T1, it is electrically connected to form with reactor L2, capacitor C3, bridge circuit is by high-frequency rectification semiconductor devices D7, D8, D9, D10
Composition；
Described Sofe Switch copped wave module passes through reactor L1, D.C. contactor KM1, capacitor C1 and resonance by three-phase rectifier
H bridges are electrically connected to form, the resonance H bridges by metal-oxide-semiconductor Q1, Q2, Q3, Q4, rectifying tube DQ1, DQ2, DQ3, DQ4, electric capacity CQ1,
CQ2, Cb and transformer T1 compositions, one route a metal-oxide-semiconductor Q1 output end by rectifying tube DQ1, electric capacity CQ1 parallel circuit,
It is in series again by rectifying tube DQ2, electric capacity CQ2 parallel circuit with another metal-oxide-semiconductor Q2 output ends；Series connection point a passes through
The output end that electric capacity Cb, transformer leakage inductance L1k are electrically connected to form is H bridge output voltage Uinv one end；One metal-oxide-semiconductor of another route
Q3 output ends are connected again by rectifying tube DQ3 series circuits with a metal-oxide-semiconductor Q4 output end by rectifying tube DQ4 series circuits
Constitute；Series connection point b output end is the H bridge output voltage Uinv other ends；Constitute full-bridge soft-switching copped wave module；Wherein electric capacity
Device C1 two ends are connected with Hall voltage sensor CHV1, and Hall current is connected between D.C. contactor KM1 and capacitor C1
Sensor CHK1.
In Fig. 1, the three-phase uncontrollable rectifier circuit of commutation diode D1, D2, D3, D4 compositions, by power frequency three-phase alternating current
It is changed into the direct current of pulsation, the secondary value of DC pulse after reactor L1 limitation rectifications, so that it becomes smooth direct current.During startup, directly
Contactor and capacitor C1 formation soft starts loop are flowed, resonance H bridge DC bus-bar voltages Ud1 slowly rises, and reduces start-up course
In rush of current.
When switching tube Q1, Q4 or Q2, Q3 are simultaneously turned on, transformer primary side provides energy to load.By phase shifting control,
Do not turn off Q4 at once when turning off Q1, but phase shifting angle is determined according to output feedback signal, turned off again after certain time
Q4, before shut-off Q1, due to Q1 conductings, voltage is equal to Q1 conduction voltage drop on its shunt capacitance CQ1, ideally its value
It is zero, when the shut-off Q1 moment, CQ1 is started to charge up, because capacitance voltage can not be mutated, and therefore, Q1 is zero voltage turn-off.Due to
Transformer leakage inductance L1k and secondary rectifying and wave-filtering inductance effect, after Q1 shut-offs, primary current can not be mutated, and continue to fill to Cb
Electricity, while CQ2 discharges also by primary side, after CQ2 voltages drop to zero, DQ2 is turned on naturally, at this moment opens Q2, then Q2 is zero
Voltage is open-minded.When CQ1 is fully charged, CQ2 discharge offs after, because DQ2 is conducting, be now added in transformer primary side winding and leakage
Voltage in sense is blocking capacitor Cb both end voltages, and primary current starts to reduce, but continues to charge to Cb, until primary current is
Zero, at this moment due to DQ4 blocking effect, electric capacity Cb can not be discharged by Q2, Q4, DQ4, and Cb both end voltages remain unchanged,
At this moment it is zero to flow through Q4 electric currents, and shut-off Q4 is zero-current switching.
Q1, Q2, Q3, Q4, DQ1, DQ2, DQ3, DQ4, CQ1, CQ2, Cb and transformer T1 compositions full-bridge soft-switching copped wave
Module, greatly reduces loss when switching tube is turned on and off, and the efficiency of the Sofe Switch chopper is improved from face.This is soft to open
Close copped wave module and H bridge output voltage Uinv are adjusted by phase-shift voltage regulating mode, transformer secondary is filtered by not controlling full-bridge rectification, LC
Wave circuit, the controllable DC voltage Ud2 of output smoothing.G1, E1 connect Q1 grid source drive signals, and G2, E2 connect Q2 grid source drives
Signal, G3, E3 connect Q3 grid source drive signals, and G4, E4 connect Q4 grid source drive signals.
In fig. 2, single Sofe Switch copped wave module is connected on single transformer armature winding, secondary simplex winding output, often
Individual Sofe Switch copped wave module embodiment is identical with described in Fig. 1.
In figure 3, multiple Sofe Switch copped wave modules are connected on the multiple armature windings of single transformer respectively, secondary simplex winding
Output, each Sofe Switch copped wave module embodiment is identical with described in Fig. 1.
In Fig. 4, multiple Sofe Switch copped wave wired in parallel, multiple output transformer secondary output windings in series outputs are each soft
Switch copped wave module embodiment identical with described in Fig. 1.
In Figure 5, multiple Sofe Switch copped wave wired in parallel, multiple output transformer secondary output winding parallel outputs are each soft
Switch copped wave module embodiment identical with described in Fig. 1.
In figure 6, Uab represents the voltage between 2 points of a, b in Fig. 1, and Ucb is the voltage on blocking capacitor Ub, and Ip is Fig. 2
Transformer T1 primary currents, Urect is the voltage after transformer T1 secondary rectifications.
Above-mentioned T1, T2, T3, T4 model power scr MTC500Y12；U1A, U1B, U2A, U2B model are monostable
State trigger CD4098, U3 model CD4001, U4 model CD4081, U5 model CD4071, U6 model CD4011；On
State model can also substitute model using function identical, belong to same innovation and creation.
Claims (5)
1. a kind of high-power soft switchs chopper circuit, it is characterized in that：Including Sofe Switch copped wave module, transformer T1, high-frequency rectification
Semiconductor devices D7, D8, D9, D10, reactor L2, capacitor C3, transformer T1 and reactance are passed through by Sofe Switch copped wave module
Device L2, capacitor C3 are electrically connected to form, and bridge circuit is made up of high-frequency rectification semiconductor devices D7, D8, D9, D10；
Described Sofe Switch copped wave module passes through reactor L1, D.C. contactor KM1, capacitor C1 and resonance by three-phase rectifier
H bridges are electrically connected to form, the resonance H bridges by metal-oxide-semiconductor Q1, Q2, Q3, Q4, rectifying tube DQ1, DQ2, DQ3, DQ4, electric capacity CQ1,
CQ2, Cb and transformer T1 compositions, one route a metal-oxide-semiconductor Q1 output end by rectifying tube DQ1, electric capacity CQ1 parallel circuit,
It is in series again by rectifying tube DQ2, electric capacity CQ2 parallel circuit with another metal-oxide-semiconductor Q2 output ends；Series connection point a passes through
The output end that electric capacity Cb, transformer leakage inductance L1k are electrically connected to form is H bridge output voltage Uinv one end；One metal-oxide-semiconductor of another route
Q3 output ends are connected again by rectifying tube DQ3 series circuits with a metal-oxide-semiconductor Q4 output end by rectifying tube DQ4 series circuits
Constitute；Series connection point b output end is the H bridge output voltage Uinv other ends；Constitute full-bridge soft-switching copped wave module；Wherein electric capacity
Device C1 two ends are connected with Hall voltage sensor CHV1, and Hall current is connected between D.C. contactor KM1 and capacitor C1
Sensor CHK1.
2. a kind of high-power chopping switch circuit according to claim 1, it is characterized in that：Described metal-oxide-semiconductor Q1, Q2, Q3, Q4
Or replace with IGCT, IGBT；Wherein Q1 grid source drive signal connection G1, E1, Q2 grid source drives signal connection G2,
E2, Q3 grid source drive signal connect G3, E3, the connection of Q4 grid source drives signal G4, E4.
3. high-power soft according to claim 1 switchs chopper circuit, described Hall voltage sensor power end CHV1
15V+, 15V- meet external power source+15V, -15V；Sampling end DCVP, DCVN are sampling and outputting voltage signal, Hall current sensing
Device CHK1 15V+, 15V- meets external power source+15V, -15V；DCIP, DCIN are sampled output current signal.
4. a kind of high-power soft switch chopper circuit according to claim 1, it is characterised in that：Described several soft are opened
The Sofe Switch chopper circuit that copped wave module electrically connects composition with transformer is closed, transformer therein includes：Single transformer is primary
Multiple coil secondary simplex winding output, multiple transformer secondary output windings in series outputs, multiple transformer secondary output winding parallel outputs；
The first by several Sofe Switch copped wave modules output end transformation respectively with single secondary simplex winding, primary Multiple coil
The corresponding primary Multiple coil of device, which is connected, to be constituted；
Second of output end by several Sofe Switch copped wave modules respectively with multiple one to one winding transformer secondary windings strings
The corresponding armature winding of transformer of connection, which is connected, to be constituted；
The third by several Sofe Switch copped wave modules output end respectively with multiple one to one winding transformer secondary windings simultaneously
The corresponding armature winding of transformer of connection, which is connected, to be constituted.
5. a kind of high-power soft switchs the method for work of chopper circuit, it is characterized in that：Commutation diode D1, D2, D3, D4 composition
Three-phase uncontrollable rectifier circuit, power frequency three-phase alternating current is changed into the direct current of pulsation, DC pulse after reactor L1 limitation rectifications
Pair value, so that it becomes smooth direct current；
During startup, D.C. contactor slowly rises with capacitor C1 formation soft starts loop, resonance H bridge DC bus-bar voltages Ud1,
Reduce the rush of current in start-up course；
When switching tube Q1, Q4 or Q2, Q3 are simultaneously turned on, transformer primary side provides energy to load；By phase shifting control, closing
Q4 is not turned off during disconnected Q1 at once, but phase shifting angle is determined according to output feedback signal, Q4 is turned off again after certain time,
Turn off before Q1, due to Q1 conductings, voltage is equal to Q1 conduction voltage drop on its shunt capacitance CQ1, and ideally its value is zero；
When the shut-off Q1 moment, CQ1 is started to charge up, because capacitance voltage can not be mutated, and therefore, Q1 is zero voltage turn-off；Due to
Transformer leakage inductance L1k and secondary rectifying and wave-filtering inductance effect, after Q1 shut-offs, primary current can not be mutated, and continue to fill to Cb
Electricity, while CQ2 discharges also by primary side；
After CQ2 voltages drop to zero, DQ2 is turned on naturally, at this moment opens Q2, then Q2 is that no-voltage is open-minded；
When CQ1 is fully charged, CQ2 discharge offs after, because DQ2 is conducting, be now added in transformer primary side winding and leakage inductance
Voltage be blocking capacitor Cb both end voltages, primary current starts to reduce, but continues to give Cb chargings, until primary current is zero,
At this moment due to DQ4 blocking effect, electric capacity Cb can not be discharged by Q2, Q4, DQ4, and Cb both end voltages remain unchanged, at this moment
It is zero to flow through Q4 electric currents, and shut-off Q4 is zero-current switching；
Q1, Q2, Q3, Q4, DQ1, DQ2, DQ3, DQ4, CQ1, CQ2, Cb and transformer T1 compositions full-bridge soft-switching copped wave module,
Loss when switching tube is turned on and off is greatly reduced, the efficiency of the Sofe Switch chopper is improved from face；
The Sofe Switch copped wave module adjusts H bridge output voltage Uinv by phase-shift voltage regulating mode, and transformer secondary is complete by not controlling
Bridge rectification, LC filter circuits, the controllable DC voltage Ud2 of output smoothing；Wherein G1, E1 connect Q1 grid source drive signals, G2, E2
Q2 grid source drive signals are connect, G3, E3 connect Q3 grid source drive signals, and G4, E4 connect Q4 grid source drive signals.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109659195A (en) * | 2019-01-07 | 2019-04-19 | 福州大学 | A kind of control of soft method of Multiple coil electromagnetic mechanism contactor |
| CN116722752A (en) * | 2023-08-04 | 2023-09-08 | 泉州艾奇科技有限公司 | Chopper step-down module and chopper step-down circuit |
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| CN207184326U (en) * | 2017-05-17 | 2018-04-03 | 洛阳科诺工业设备有限公司 | A kind of high-power soft switchs chopper circuit |
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| CN109659195A (en) * | 2019-01-07 | 2019-04-19 | 福州大学 | A kind of control of soft method of Multiple coil electromagnetic mechanism contactor |
| CN116722752A (en) * | 2023-08-04 | 2023-09-08 | 泉州艾奇科技有限公司 | Chopper step-down module and chopper step-down circuit |
| 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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