CN104467449A - Power frequency synchronization follow current control device of AC chopper circuit - Google Patents
Power frequency synchronization follow current control device of AC chopper circuit Download PDFInfo
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- CN104467449A CN104467449A CN201410833038.7A CN201410833038A CN104467449A CN 104467449 A CN104467449 A CN 104467449A CN 201410833038 A CN201410833038 A CN 201410833038A CN 104467449 A CN104467449 A CN 104467449A
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- control device
- power frequency
- alternating current
- continued flow
- flow switch
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Classifications
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
- H02M5/293—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
Abstract
The invention relates to a power frequency synchronization follow current control device of an AC chopper circuit. The AC chopper circuit comprises a chopping switch IGBT component, a power frequency synchronization follow current control device body Q, a follow current switch component, a filter inductor L, a filter capacitor C and a load RL. Follow current control signal voltage output by the power frequency synchronization follow current control device body Q is only identical with alternating current input in the chopping switch IGBT component in power frequency. Self-inductance current of the load RL and self-inductance current of the filter inductor L are obtained through a closed circuit formed by a follow current switch T1 switched on in each positive semicircle and a follow current switch T2 switched on in each negative semicircle after each switching off of the chopping switch IGBT component. By means of the power frequency synchronization follow current control device, AC chopping does not need a dead time, in-time follow current without a time difference is achieved between a follow current start time and a chopping shutoff time.
Description
Technical field
The present invention relates to mains chopper control technical field, is a kind of power frequency synchronous freewheeling control device of alternating-current chopper circuit.
Background technology
AC chopping is a kind of best technology type realizing civil power pressure regulation conversion, and Fig. 1 is shown in by its circuit structure block diagram, comprises chopping switch assembly 1, copped wave and follow current control device 2, continued flow switch assembly 3, filter inductance 4, filter capacitor 5 and load 6.Due to the effect of induction reactance, the induced current that filter inductance 4 and the shutoff of load 6 after each conducting of chopping switch assembly 1 can be formed, need to provide the path continuing circulation to induced current, namely the circuit after chopping switch assembly 1 will be connected in parallel the continued flow switch assembly 3 bearing induced current continuation circulation effect, the conducting of control continued flow switch assembly 3 and the voltage signal of shutoff are produced by follow current control device.The best effects of afterflow is that freewheel current start time and chopper current turn off not free interval between the moment.
The afterflow control signal voltage that the follow current control device of current technology produces is closely related with the signal voltage controlling chopping switch assembly, the frequency of afterflow control signal voltage is identical with the frequency of chopping control signal voltage, " u copped wave and u afterflow " in Fig. 2 is that chopping control signal voltage waveform and continued flow switch control signal voltage waveform are illustrated respectively, because chopping switch assembly and continued flow switch assembly are all adopt IGBT switch element, turning on and off of IGBT switch element needs the time, and in order to prevent from the IGBT in continued flow switch assembly from misleading causing the short circuit to copped wave back-end circuit, moment t1 and continued flow switch need be turned off at chopping switch to open between moment t2 and arrange one section of time delay, this section of time delay is commonly called as " Dead Time " in electrical technology is capable.Due to " Dead Time " Δ t, just cause freewheel current start time to lag behind chopper current and turn off Δ t of a bit of time in moment, i in Fig. 2 lags behind the waveform signal that chopper current turns off the moment freewheel current start time, Fig. 3 is the amplification effect figure of part A in Fig. 2, and chopper current and freewheel current are respectively with to fill compared with deep fill and more shallow filling represents.T0 in Fig. 2 and Fig. 3 is each copped wave stream electric current start time, t1 is that each chopper current turns off the moment, t2 is each freewheel current start time, Δ t lags behind the time that chopper current turns off the moment freewheel current start time, freewheel current start time lag behind chopper current turn off the moment just cause afterflow not in time, have impact on the afterflow effect of AC chopping, also owing to necessarily arranging " Dead Time " Δ t, the frequency of AC chopping is improved further and is restricted.When carrying out three-phase alternating current copped wave, the phase place of the control signal to chopping switch and continued flow switch is also needed to carry out more accurate and complicated control.
Summary of the invention
The technical solution adopted for the present invention to solve the technical problems is:
A kind of power frequency synchronous freewheeling control device of alternating-current chopper circuit, alternating-current chopper circuit comprises chopping switch IGBT assembly, power frequency synchronous freewheeling control device Q, continued flow switch assembly, filter inductance L, filter capacitor C, with load RL, continued flow switch assembly comprises continued flow switch T1 and continued flow switch T2, power frequency synchronous freewheeling control device Q outpat control signal voltage is to chopping switch IGBT assembly, power frequency synchronous freewheeling control device Q exports afterflow control signal voltage to continued flow switch assembly, it is characterized in that, it is identical with the work frequency of the alternating current of input chopping switch IGBT assembly with the frequency of the afterflow control signal voltage signal of continued flow switch T2 that power frequency synchronous freewheeling control device Q exports to continued flow switch T1.
Industrial-frequency alternating current is transformed into the afterflow control signal voltage that two-way corresponds respectively to the positive half cycle of alternating current and negative half period by power frequency synchronous freewheeling control device Q; First via afterflow control signal voltage is applied on the gate pole of continued flow switch T1, and become high level in each positive half cycle start time of industrial-frequency alternating current and maintain the half period time, each negative half period start time with industrial-frequency alternating current becomes low level and maintains the half period time, make continued flow switch T1 be in conducting state in each positive half cycle of industrial-frequency alternating current, in each negative half period of industrial-frequency alternating current, be in off state; Second tunnel afterflow control signal voltage is applied on the gate pole of continued flow switch T2, and become high level in each negative half period start time of industrial-frequency alternating current and maintain the half period time, each positive half cycle start time with industrial-frequency alternating current becomes low level and maintains the half period time, make continued flow switch T2 be in conducting state in each negative half period of alternating current, in each positive half cycle of industrial-frequency alternating current, be in off state.
Three power frequency synchronous freewheeling control device Q are applied on three-phase circuit, just form three-phase alternating current copped wave power frequency synchronous freewheeling control device.
The first via and the second tunnel afterflow control signal voltage are applied on the gate pole of continued flow switch T1 and T2 by power frequency synchronous freewheeling control device respectively, the alternate conduction synchronous by the power frequency of continued flow switch T1 and T2 and shutoff, freewheel current start time and chopper current were turned off between the moment not free poor, achieve the timely afterflow that afterflow effect is best.
The invention has the beneficial effects as follows:
(1) the afterflow control signal voltage that the power frequency synchronous freewheeling control device of alternating-current chopper circuit exports makes continued flow switch T1 and T2 respectively between each positive half period of alternating current and be in opening state between negative half-cycle always, each shutoff of chopping switch assembly is made to be obtained for timely afterflow without any time delay, the better effects if of afterflow.
(2) do not have " Dead Time " owing to opening between the moment in chopping switch shutoff moment and afterflow, therefore alternating-current chopper circuit can adopt higher chopping frequency, improves the technical performance of alternating-current chopper circuit.
(3) the afterflow control signal voltage produced due to the power frequency synchronous freewheeling control device of alternating-current chopper circuit only with the frequency cadence synchronization of the alternating current of institute copped wave, make the structure of copped wave follow current control device circuit more simple, improve the reliability of alternating-current chopper circuit work.
(4) the present invention is adopted can to produce the general AC chopper voltage regulator applying any character load.
(5) the present invention is adopted can also to produce the AC power with automatic voltage regulation function.
Accompanying drawing explanation
Fig. 1 is that alternating-current chopper circuit forms block diagram.
Fig. 2 is the waveform schematic diagram that afterflow starts to turn off with copped wave life period and postpones.
Fig. 3 is the chopper current and freewheel current waveform time relation schematic diagram that in Fig. 2, part A is exaggerated.
Fig. 4 is that the beginning of power frequency synchronous freewheeling and copped wave turn off the not free waveform schematic diagram postponed.
Fig. 5 is the chopper current and freewheel current waveform time relation schematic diagram that in Fig. 4, part B is exaggerated.
Fig. 6 is the circuit block diagram of the embodiment of the present invention 1.
Fig. 7 is the circuit block diagram of the embodiment of the present invention 2.
Fig. 8 is the circuit block diagram of the embodiment of the present invention 3.
Fig. 9 is the circuit block diagram of the embodiment of the present invention 4.
Figure 10 is a kind of concrete circuit diagram that the present invention realizes power frequency synchronous freewheeling control device.
Figure 11 is the first constituted mode of AC chopping switch module in the present invention.
Figure 12 is the second constituted mode of AC chopping switch module in the present invention.
Figure 13 is the third constituted mode of AC chopping switch module in the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment 1
See shown in Fig. 4, Fig. 5 and Fig. 6, the present embodiment is made up of chopping switch IGBT assembly, continued flow switch T1 and T2, power frequency synchronous freewheeling control device Q, filter inductance L, filter capacitor C and AC load RL, chopping switch IGBT assembly enter termination power phase line, the end that goes out of chopping switch IGBT assembly is connected with filter inductance L one end, and the other end of inductance L is connected with one end of AC load with one end of filter capacitor.The end that goes out of chopping switch IGBT assembly is also connected with the collector electrode of continued flow switch T2, and the emitter of T2 is connected with the emitter of T1, and the collector electrode of T1 is connected with mains neutral line, and mains neutral line is also connected with the other end of filter capacitor, the other end of load RL.To work as power supply phase line L is that just mains neutral line is the positive half cycle that negative state is defined as alternating current, and it is negative for working as power supply phase line L, and mains neutral line is the negative half period that positive state is defined as alternating current.Then by the collector electrode of T1 to emitter, positive pole again through the damper diode in parallel with inter-collector with T2 emitter constitutes freewheeling path corresponding to the positive half cycle of alternating current to negative pole, by the positive pole of the T1 emitter damper diode in parallel with inter-collector to negative pole, then constitute freewheeling path corresponding to alternating current negative half period through the collector electrode of T2 to emitter.
Chopping switch is under the chopping signal that power frequency synchronous freewheeling control device Q exports drives, carry out the AC chopping of pulse width modulation mode, what produced by power frequency synchronous freewheeling control device Q changes synchronous afterflow control signal voltage with the positive and negative half cycle of alternating current and is applied on the gate pole of continued flow switch T1 and T2 respectively, and synchronous afterflow control signal voltage makes that continued flow switch elements T 1 and T2's alternately turn on and off the positive and negative half cycle corresponding respectively to alternating current.Because continued flow switch T1 is in conducting state in each positive half cycle of alternating current, each shutoff after chopping switch IGBT opens for more than thousands of times in each positive half cycle, all makes the induced current that in filter inductance and load RL, inductance produces obtain afterflow timely by the freewheeling path corresponding to the positive half cycle of alternating current.In like manner, because continued flow switch T2 is in conducting state in each negative half period of alternating current, each shutoff after chopping switch IGBT opens for more than thousands of times in each negative half period, all makes the induced current that in filter inductance L and load RL, inductance produces obtain afterflow timely by the freewheeling path corresponding to alternating current negative half period.Fig. 4 be power frequency synchronous freewheeling control device produce chopping control signal voltage " u copped wave ", the positive half cycle afterflow control signal " u afterflow just " synchronous with alternating current power frequency, and the waveform of synchronous negative half period afterflow control signal " u afterflow is born ", chopper current and the freewheel current i time relationship of alternating current power frequency illustrate, Fig. 5 is the amplification effect figure of part B in Fig. 4.T0 in Fig. 4 and Fig. 5 is each copped wave stream electric current start time, t1 is that each chopper current turns off moment and each freewheel current start time, namely freewheel current start time and chopper current to turn off between the moment not free poor, achieve the timely afterflow that afterflow effect is best.
Because continued flow switch T2 is in off state in each positive half cycle of alternating current, so the collector electrode that the chopper current of positive half cycle can not flow through T2 forms short circuit to emitter.Because continued flow switch T1 is in off state in each negative half period of alternating current, so the collector electrode that the chopper current of negative half period can not flow through T1 forms short circuit to emitter.After copped wave, alternating voltage is through the filtering of inductance L and electric capacity C, and AC load RL just obtains the sinusoidal ac after chopper control.
Embodiment 2
See Fig. 4, Fig. 5 and Fig. 7, shown in, the present embodiment is made up of chopping switch IGBT assembly, continued flow switch T1, diode D1, continued flow switch T2, diode D2, power frequency synchronous freewheeling control device Q, filter inductance L, filter capacitor C and AC load RL.Chopping switch IGBT assembly enter termination power phase line, chopping switch IGBT assembly go out end be connected with filter inductance L one end, the other end of inductance L is connected with one end of AC load with one end of filter capacitor.The output of chopping switch IGBT assembly is also connected with the positive pole of D2, the negative pole of D1, the positive pole of D1 is connected with the emitter of continued flow switch T1, the negative pole of D2 is connected with the collector electrode of continued flow switch T2, and the emitter of mains neutral line and T1, the collector electrode of T2, the other end of filter capacitor, the other end of load RL are connected.To work as power supply phase line L is that just mains neutral line is the positive half cycle that negative state is defined as alternating current, and it is negative for working as power supply phase line L, and mains neutral line is the negative half period that positive state is defined as alternating current.Then by the collector electrode of T1 to emitter, then through just constituting to negative pole the freewheeling path that AC chopping corresponds to positive half cycle with the positive pole of D1, by the positive pole of D2 to negative pole, then constitute the freewheeling path of AC chopping corresponding to negative half period through the collector electrode of T2 to emitter.
The chopping control signal voltage " u copped wave " of embodiment 2, afterflow control signal voltage " u afterflow just " and " u afterflow is born ", chopper current and the signal of freewheel current waveform are still shown in Fig. 4 and Fig. 5.In the same manner as in Example 1, it is not free poor that freewheel current start time and chopper current turned off between the moment course of work of embodiment 2, achieves the timely afterflow that afterflow effect is best.AC load RL obtains the sinusoidal ac after chopper control.
Embodiment 3
See shown in Fig. 4, Fig. 5 and Fig. 8, embodiment 3 is similar to Example 1, difference is, the present embodiment is the alternating-current chopper circuit that have employed three power frequency synchronous freewheeling control device Q in the same manner as in Example 1 on three-phase line, form the main circuit structure that power frequency synchronous freewheeling controls three-phase alternating current copped wave, operation principle no longer describes in detail.
Embodiment 4
See shown in Fig. 4, Fig. 5 and Fig. 9, embodiment, 4 is similar to Example 2, difference is, the present embodiment is the alternating-current chopper circuit that have employed three power frequency synchronous freewheeling control device Q in the same manner as in Example 2 on three-phase line, form the main circuit structure that power frequency synchronous freewheeling controls three-phase alternating current copped wave, operation principle no longer describes in detail.
In above-mentioned four embodiments, realize a kind of physical circuit that power frequency synchronous freewheeling control device Q function can take and see Figure 10, power frequency synchronous freewheeling control device Q is made up of Q1 circuit, Q2 circuit and Q3 circuit, wherein Q1 circuit produces the chopping control signal voltage " u copped wave " of pulse width modulation mode, and this chopping control signal voltage is transported to the control gate pole of chopping switch assembly; Q2 circuit produces the afterflow control signal voltage " u afterflow just " synchronous with power frequency and " u afterflow is born ", is transported to the control gate pole of continued flow switch T1 and T2 respectively; Civil power is transformed into the mutually isolated DC power supply in four tunnels by Q3 circuit, powers to respectively each functional circuit in Q1 and Q2.VCC1, VSS1 of VCC1, VSS1 correspondence access Q1 circuit of Q3 circuit, VCC2, VSS2 of VCC2, VSS2 correspondence access Q1 circuit of Q3 circuit; VCC3, VSS3 of VCC3, VSS3 correspondence access Q2 circuit of Q3 circuit, VCC4, VSS4 of VCC4, VSS4 correspondence access Q2 circuit of Q3 circuit.
The physical circuit realizing power frequency synchronous freewheeling control device Q can also have multiple, but no matter physical circuit how, the afterflow control signal voltage that it produces all has the synchronous feature of power frequency, exactly industrial-frequency alternating current is transformed into the two-way afterflow control signal voltage corresponding respectively to and exchange positive half cycle and negative half period; First via afterflow control signal voltage becomes high level in each positive half cycle start time of alternating current and maintains the half period time, and each negative half period start time with industrial-frequency alternating current becomes low level and maintains the half period time; Second tunnel afterflow control signal voltage becomes high level in each negative half period start time of alternating current and maintains the half period time, and each positive half cycle start time with industrial-frequency alternating current becomes low level and maintains the half period time.Namely the alternately change of power frequency synchronous freewheeling control signal voltage is only associated with alternating current, does not have any association with chopping control signal voltage.
In above-mentioned four embodiments, AC chopping switch I GBT assembly mainly contains three kinds of forms of the composition, as Figure 11 to Figure 13.The first sees Figure 11, be made up of transistor IGBT, diode D1, D2, D3 and D4, D1, D2, D3 and D4 form rectifier bridge, the collector electrode of the positive output termination transistor IGBT of rectifier bridge, the collector electrode of the negative output termination IGBT of rectifier bridge, an ac input end of rectifier bridge meets mains supply phase line L, and another ac input end of rectifier bridge is exactly copped wave output; The second is shown in Figure 12, be made up of transistor T1, T2, diode D1 and D2, the collector electrode of T1 is all connected with mains supply phase line L with the emitter of T2, the emitter of T1 is connected with the positive pole of diode D1, the collector electrode of T2 is connected with the negative pole of diode D2, the negative pole of D1 and the positive pole of D2 are connected to form tie point, and this tie point is exactly copped wave output; The third sees Figure 13, is to be made up of transistor T1, T2, and the collector electrode of T1 meets mains supply phase line L, and the emitter of T1 is connected with the emitter of T2, and the collector electrode of T2 is exactly copped wave output.
In above-mentioned four embodiments, with original technology difference be, the frequency of the afterflow control signal voltage that power frequency synchronous freewheeling control device of the present invention exports is exactly the work frequency of the alternating current of input chopping switch IGBT assembly, i.e. afterflow control signal voltage is only synchronous with the work frequency of alternating current, the Frequency Synchronization do not changed with the break-make of chopping switch, the turn-on and turn-off of continued flow switch element of the present invention correspond respectively to the positive and negative half cycle alternately change of alternating current, do not change corresponding with the conducting of chopping switch with shutoff.
Above-described embodiment example, is only preferred embodiment of the present invention, such as according to the equivalent arrangements that the scope of the claims of the present invention does, all should be technology of the present invention and contained.
Claims (3)
1. the power frequency synchronous freewheeling control device of an alternating-current chopper circuit, alternating-current chopper circuit comprises chopping switch IGBT assembly, power frequency synchronous freewheeling control device Q, continued flow switch assembly, filter inductance L, filter capacitor C, with load RL, continued flow switch assembly comprises continued flow switch T1 and continued flow switch T2, power frequency synchronous freewheeling control device Q outpat control signal voltage is to chopping switch IGBT assembly, power frequency synchronous freewheeling control device Q exports afterflow control signal voltage to continued flow switch assembly, it is characterized in that, it is identical with the work frequency of the alternating current of input chopping switch IGBT assembly with the frequency of the afterflow control signal voltage signal of continued flow switch T2 that power frequency synchronous freewheeling control device Q exports to continued flow switch T1.
2. the power frequency synchronous freewheeling control device of a kind of alternating-current chopper circuit according to claim 1, it is characterized in that, industrial-frequency alternating current is transformed into the two-way afterflow control signal voltage corresponding respectively to and exchange positive half cycle and negative half period by power frequency synchronous freewheeling control device Q; First via afterflow control signal voltage is applied on the gate pole of continued flow switch T1, and become high level in each positive half cycle start time of industrial-frequency alternating current and maintain the half period time, each negative half period start time with industrial-frequency alternating current becomes low level and maintains the half period time, make continued flow switch T1 be in conducting state in each positive half cycle of industrial-frequency alternating current, in each negative half period of industrial-frequency alternating current, be in off state;
Second tunnel afterflow control signal voltage is applied on the gate pole of continued flow switch T2, and become high level in each negative half period start time of industrial-frequency alternating current and maintain the half period time, each positive half cycle start time with industrial-frequency alternating current becomes low level and maintains the half period time, make continued flow switch T2 be in conducting state in each negative half period of alternating current, in each positive half cycle of industrial-frequency alternating current, be in off state.
3. a kind of power frequency synchronous freewheeling control device of alternating-current chopper circuit according to any one of claim 1 to 2, it is characterized in that, three power frequency synchronous freewheeling control device Q are applied on three-phase circuit, just form three-phase alternating current copped wave power frequency synchronous freewheeling control device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410833038.7A CN104467449A (en) | 2014-12-29 | 2014-12-29 | Power frequency synchronization follow current control device of AC chopper circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410833038.7A CN104467449A (en) | 2014-12-29 | 2014-12-29 | Power frequency synchronization follow current control device of AC chopper circuit |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10160361A1 (en) * | 2001-12-08 | 2003-07-03 | Ixys Semiconductor Gmbh | Device for providing alternating or 3-phase currents has control circuit that switches reverse blocking IGBTs connected in reverse parallel on and off during positive and negative half waves |
| WO2010079478A1 (en) * | 2009-01-07 | 2010-07-15 | Powersines Ltd. | Solid state voltage regulator |
| CN102291005A (en) * | 2010-06-18 | 2011-12-21 | 上海威曼电气科技发展有限公司 | AC chopper |
| CN102412731A (en) * | 2010-09-25 | 2012-04-11 | 樊远征 | Chopped AC (alternating current) voltage regulator |
| CN104201905A (en) * | 2014-08-30 | 2014-12-10 | 龚秋声 | Two-way AC chopper control circuit |
| CN204304795U (en) * | 2014-12-29 | 2015-04-29 | 韩亚兰 | The power frequency synchronous freewheeling control device of alternating-current chopper circuit |
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2014
- 2014-12-29 CN CN201410833038.7A patent/CN104467449A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10160361A1 (en) * | 2001-12-08 | 2003-07-03 | Ixys Semiconductor Gmbh | Device for providing alternating or 3-phase currents has control circuit that switches reverse blocking IGBTs connected in reverse parallel on and off during positive and negative half waves |
| WO2010079478A1 (en) * | 2009-01-07 | 2010-07-15 | Powersines Ltd. | Solid state voltage regulator |
| CN102291005A (en) * | 2010-06-18 | 2011-12-21 | 上海威曼电气科技发展有限公司 | AC chopper |
| CN102412731A (en) * | 2010-09-25 | 2012-04-11 | 樊远征 | Chopped AC (alternating current) voltage regulator |
| CN104201905A (en) * | 2014-08-30 | 2014-12-10 | 龚秋声 | Two-way AC chopper control circuit |
| CN204304795U (en) * | 2014-12-29 | 2015-04-29 | 韩亚兰 | The power frequency synchronous freewheeling control device of alternating-current chopper circuit |
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