CN105471291A - Flyback type AC-DC voltage conversion circuit and flyback type voltage converter - Google Patents
Flyback type AC-DC voltage conversion circuit and flyback type voltage converter Download PDFInfo
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- CN105471291A CN105471291A CN201511032395.4A CN201511032395A CN105471291A CN 105471291 A CN105471291 A CN 105471291A CN 201511032395 A CN201511032395 A CN 201511032395A CN 105471291 A CN105471291 A CN 105471291A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal 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
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention is applicable to the field of an integrated circuit, and provides a flyback type AC-DC voltage conversion circuit and a flyback type voltage converter. The flyback type AC-DC voltage conversion circuit comprises a source side power tube, coils, a secondary side power tube, an input capacitor, an output capacitor, a resistor, a diode, a source side control unit, a voltage sampling unit, and a secondary side control unit, wherein the source side control unit is used for generating a fixed conduction time signal for controlling the source side power tube to be switched on, generating a pulse time signal for controlling the source side power tube to be switched off, and performing voltage conversion though a secondary side inductor; the voltage sampling unit is used for sampling the output voltage; and the secondary side control unit is used for generating a switching frequency signal according to the sampled voltage to control the secondary side power tube to be switched on, and to further control the source side power tube to be re-switched on. According to the flyback type AC-DC voltage conversion circuit, the starting signal for the source side power tube is generated through the voltage sampling unit of the primary side; a switch-off signal for controlling the source side power tube is generated through the source side control unit of the source side, so that the voltage conversion is realized without requiring an optical coupler, a source side auxiliary winding and a resistor; and therefore, the cost and the standby power consumption are reduced, and the conversion efficiency and the heavy load efficiency are improved.
Description
Technical field
The invention belongs to field of power supplies, particularly relate to a kind of inverse-excitation type AC-DC voltage conversion circuit and inverse-excitation type electric pressure converter.
Background technology
Flyback voltage converting circuit, also known as Flyback voltage conversion circuit, this circuit, in main switch conduction period storage power, at main switch blocking interval to load transfer energy, is particularly suitable for the application demand of small-power, multiple-channel output.
Current inverse-excitation type AC-DC voltage conversion circuit mainly adopts two kinds of control methods below:
1, opto-coupled feedback, but this mode needs an outside connection optic coupling element usually, and cost compare is high;
2, limit, source feedback, but this mode needs an auxiliary winding to sample to output voltage usually, and have higher stand-by power consumption.
Further, existing inverse-excitation type AC-DC voltage conversion circuit needs sampling resistor to limit, source electric current of sampling, and sampling resistor can produce power consumption, thus reduces conversion efficiency.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of inverse-excitation type AC-DC voltage conversion circuit, and being intended to solve existing inverse-excitation type change-over circuit needs sampling resistor to limit, source electric current of sampling, and reduces the problem of conversion efficiency.
The embodiment of the present invention is achieved in that a kind of inverse-excitation type AC-DC voltage conversion circuit, and described circuit comprises:
Limit, source power tube, coil, secondary power tube; And
Limit, source control unit, for generating limit, source power tube conducting described in fixing ON time signal controlling, one-pulse time signal is generated after the power tube conducting of limit, described source, at the end of described pulse period signal limit, described source power tube turn off, and by described coil control its secondary inductance carry out voltage transitions export VD;
Voltage sampling unit, for sampling to described VD, generates sampled voltage;
Secondary control unit, for generating according to described sampled voltage the conducting that switch frequency signal controls described secondary power tube, controls the conducting again of limit, described source power tube after the conducting of described secondary power tube;
Described circuit also comprises:
Input capacitance Cin, output capacitance Cout, resistance R3 and diode D1;
The Same Name of Ends of limit, described coil source inductance is the input connection input voltage of described circuit, the Same Name of Ends of limit, described coil source inductance is also by described input capacitance Cin ground connection, the different name end of limit, described coil source inductance is connected with the input of limit, described source control unit and the input of limit, described source power tube simultaneously, the output head grounding of limit, described source power tube, the output of limit, described source control unit is connected with the control end of limit, described source power tube, and the control end of limit, described source power tube is also connected with the feedback end of limit, described source control unit;
The different name end of described coil secondary inductance is the output output VD of described circuit, the different name end of described coil secondary inductance is also by described output capacitance Cout ground connection, the different name end of described coil secondary inductance is also connected with the input of described voltage sampling unit, the output of described voltage sampling unit is connected with the input of described secondary control unit, the output of described secondary control unit is connected with the control end of described secondary power tube, the input of described secondary power tube is connected with one end of described resistance R3, the other end of described resistance R3 is connected with the Same Name of Ends of described coil secondary inductance and the negative electrode of described diode D1 simultaneously, the anode of described diode D1 and the output of described secondary power tube ground connection simultaneously.
Another object of the embodiment of the present invention is, provides a kind of inverse-excitation type electric pressure converter comprising above-mentioned inverse-excitation type AC-DC voltage conversion circuit.
The embodiment of the present invention adopts fixing ON time to control limit, source power tube by limit, source, to reach the object controlling output voltage, and the voltage sampling unit of secondary generates the start signal of limit, control source power tube to output voltage sampling, the cut-off signals of limit, control source power tube is generated again by limit, the source control unit on limit, source, and by loop cycle, complete AC-DC voltage transitions, winding is assisted without the need to optocoupler, limit, source, also without the need to resistance, reduce cost and stand-by power consumption, improve conversion efficiency and heavy duty efficiency.
Accompanying drawing explanation
The structure chart of the inverse-excitation type AC-DC voltage conversion circuit that Fig. 1 provides for the embodiment of the present invention;
The exemplary circuit structure chart of the inverse-excitation type AC-DC voltage conversion circuit that Fig. 2 provides for the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each execution mode of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
The embodiment of the present invention generates the start signal of limit, control source power tube by the voltage sampling unit sampling of secondary, the cut-off signals of limit, control source power tube is generated again by limit, the source control unit on limit, source, realize AC-DC voltage transitions, winding and resistance is assisted without the need to optocoupler, limit, source, reduce cost and stand-by power consumption, improve conversion efficiency and heavy duty efficiency.
Fig. 1 shows the structure of the inverse-excitation type AC-DC voltage conversion circuit that the embodiment of the present invention provides, and for convenience of explanation, illustrate only part related to the present invention.
As one embodiment of the invention, this inverse-excitation type AC-DC voltage conversion circuit can be applied in multiple inverse-excitation type electric pressure converter, such as AC-DC charger, LED driving governor etc.
This inverse-excitation type AC-DC voltage conversion circuit comprises:
Limit, source power tube M1, coil T, secondary power tube M2; And
Limit, source control unit 1, the power tube M1 conducting of limit, source is controlled for generating fixing ON time signal Tc, one-pulse time signal is generated after the power tube M1 conducting of limit, source, at the end of pulse period signal, limit, source power tube M1 turns off, and by coil T control its secondary inductance L1 carry out voltage transitions export VD Vout;
Voltage sampling unit 3, for sampling to VD Vout, generates sampled voltage Vsence;
Secondary control unit 2, for generating according to sampled voltage Vsence the conducting that switch frequency signal Tsw controls secondary power tube M2, controls limit, source power tube M1 conducting again after the conducting of secondary power tube M2;
This inverse-excitation type AC-DC voltage conversion circuit also comprises:
Input capacitance Cin, output capacitance Cout, resistance R3 and diode D1;
The Same Name of Ends of limit, coil T source inductance L 0 is the input connection input voltage vin of this inverse-excitation type AC-DC voltage conversion circuit, the Same Name of Ends of limit, coil T source inductance L 0 is also by input capacitance Cin ground connection, the different name end of limit, coil T source inductance L 0 is connected with the input of limit, source control unit 1 and the input of limit, source power tube M1 simultaneously, the output head grounding of limit, source power tube M1, the output of limit, source control unit 1 is connected with the control end of limit, source power tube M1, and the control end of limit, source power tube M1 is also connected with the feedback end of limit, source control unit 1;
The different name end of coil T secondary inductance L1 is the output output VD Vout of this inverse-excitation type AC-DC voltage conversion circuit, the different name end of coil T secondary inductance L1 is also by output capacitance Cout ground connection, the different name end of coil T secondary inductance L1 is also connected with the input of voltage sampling unit 3, the output of voltage sampling unit 3 is connected with the input of secondary control unit 2, the output of secondary control unit 2 is connected with the control end of secondary power tube M2, the input of secondary power tube M2 is connected with one end of resistance R3, the other end of resistance R3 is connected with the Same Name of Ends of coil T secondary inductance L1 and the negative electrode of diode D1 simultaneously, the anode of diode D1 and the output of secondary power tube M2 ground connection simultaneously.
As one embodiment of the invention, this pulse period signal is the negative-going pulse signal be directly proportional to input voltage vin.
Limit, source power tube M1 and secondary power tube M2 is N-type metal-oxide-semiconductor, the drain electrode of metal-oxide-semiconductor is the input of limit, source power tube M1 and secondary power tube M2, the source electrode of N-type metal-oxide-semiconductor is the output of limit, source power tube M1 and secondary power tube M2, and the grid of N-type metal-oxide-semiconductor is limit, source power tube M1 and secondary power tube M2 control end.
As one embodiment of the invention, can limit, source control unit 1 and limit, source power tube M1 be integrated in a chip, secondary control unit 2, voltage sampling unit 3, secondary power tube M2 and resistance R3 are integrated in another chip.
In embodiments of the present invention, limit, source control unit 1 generates fixing ON time signal Tc and controls the power tube M1 conducting of limit, source, one-pulse time signal is generated after the power tube M1 conducting of limit, source, at the end of pulse period signal, limit, source power tube M1 turns off, and by coil T control its secondary inductance L1 carry out voltage transitions export VD Vout, voltage sampling unit 3 couples of VD Vout sample, generate sampled voltage Vsence, secondary control unit 2, the conducting that switch frequency signal Tsw controls secondary power tube M2 is generated according to sampled voltage Vsence, limit, source power tube M1 conducting is again controlled after the conducting of secondary power tube M2.
The embodiment of the present invention adopts fixing ON time to control limit, source power tube by limit, source, to reach the object controlling output voltage, and the voltage sampling unit of secondary generates the start signal of limit, control source power tube M1 to output voltage sampling, the cut-off signals of limit, control source power tube M1 is generated again by limit, the source control unit on limit, source, and by loop cycle, complete AC-DC voltage transitions.
The embodiment of the present invention assists winding without the need to optocoupler, limit, source, also realizes inverse-excitation type AC-DC voltage transitions without the need to resistance to the sampling of limit, source, reduces cost and stand-by power consumption, improve conversion efficiency and heavy duty efficiency.
Fig. 2 shows the exemplary circuit structure of the inverse-excitation type AC-DC voltage conversion circuit that the embodiment of the present invention provides, and for convenience of explanation, illustrate only part related to the present invention.
As one embodiment of the invention, this limit, source control unit 1 comprises:
Logic control module 12, controls the power tube M1 conducting of limit, source for generating fixing ON time signal Tc;
First comparison module 11, for the input terminal voltage of limit, source power tube M1 is compared with ground voltage, formation logic digital signal;
ON time generation module 13, for generating ON time signal Ton, adjusts the fixing ON time signal Tc of output for Logic control module 12 according to logic digital signal and ON time signal Ton;
The input of the first comparison module 11 is the input of limit, source control unit 1, the first input end of the output andlogic control module 12 of the first comparison module 11 connects, the output of Logic control module 12 is the output of limit, source control unit 1, the input of ON time generation module 13 is the feedback end of limit, source control unit 1, and the second input of the output andlogic control module 12 of ON time generation module 13 connects.
Preferably, the first comparison module 11 can adopt comparator, and the reverse input end of comparator is the input of the first comparison module 11, the positive input ground connection of comparator, and the output of comparator is the output of the first comparison module 11.
Preferably, Logic control module 12 can be adopted as rest-set flip-flop, the S end of rest-set flip-flop is the first input end of Logic control module 12, and the R end of rest-set flip-flop is the second input of Logic control module 12, and the Q end of rest-set flip-flop is the output of Logic control module 12.
As one embodiment of the invention, this voltage sampling unit 3 comprises:
Resistance R1, resistance R2;
One end of resistance R1 is the input of voltage sampling unit 3, and the other end of resistance R1 is that the output of voltage sampling unit 3 is by resistance R2 ground connection.
As one embodiment of the invention, this secondary control unit 2 comprises:
Current source Iramp, voltage source DC, adder and the second comparison module 21;
The input of current source Iramp connects supply voltage, the output of current source Iramp is connected with the first input end of adder, second input of adder is the input of secondary control unit 2, the output of adder is connected with the first input end of the second comparison module 21, second input of the second comparison module 21 is connected with the positive pole of voltage source DC, the minus earth of voltage source DC, the output of the second comparison module 21 is the output of secondary control unit 2.
Preferably, second comparison module 21 can adopt comparator, the reverse input end of comparator is the first input end of the second comparison module 21, and the positive input of comparator is the second input of the second comparison module 21, and the output of comparator is the output of the second comparison module 21.
In embodiments of the present invention, after limit, source power tube M1 opens, node M 1D produces a pulse period signal, this pulse period signal is the negative-going pulse signal be directly proportional to the input voltage vin of input ACInput, at the end of this pulse period signal (rising edge of pulse), limit, shutoff source power tube M1, secondary transformer is started working, to output DCOutput output current.
Within the power tube M1 turn-off time of limit, source, current source Iramp produces a downward ramp voltage, the slope of this ramp voltage is proportional to VD, and this ramp voltage is superposed with the sampled voltage Vsence obtained after sampling by adder, produce a feedback signal FB, the reference voltage V ref that this feedback signal FB provides with voltage source DC compares, when feedback voltage FB is less than reference voltage V ref and secondary inductance L1 electric current after zero passage, second comparison module 21 produces a pulse signal and goes to open secondary power tube M2, the Same Name of Ends of secondary inductance L1 is connected to the negative terminal (earth potential) of secondary output voltage by this secondary power tube M2.
At the end of the ON time of secondary power tube M2, secondary power tube M2 turns off, the drain electrode M1D of limit, source power tube M1 can be pulled to negative pressure by limit, source inductance L 0, the drain electrode M1D voltage of the input detection resources limit power tube M1 of the first comparison module, when the M1D voltage that drains is less than limit, source earth potential, open a new switch periods, open limit, source power tube M1.
Another object of the embodiment of the present invention is, provides a kind of inverse-excitation type electric pressure converter comprising above-mentioned inverse-excitation type AC-DC voltage conversion circuit.
The embodiment of the present invention adopts fixing ON time to control limit, source power tube by limit, source, to reach the object controlling output voltage, and the voltage sampling unit of secondary generates the start signal of limit, control source power tube M1 to output voltage sampling, the cut-off signals of limit, control source power tube M1 is generated again by limit, the source control unit on limit, source, and by loop cycle, complete AC-DC voltage transitions.
The embodiment of the present invention assists winding without the need to optocoupler, limit, source, also realizes inverse-excitation type AC-DC voltage transitions without the need to resistance to the sampling of limit, source, reduces cost and stand-by power consumption, improve conversion efficiency and heavy duty efficiency.
These are only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an inverse-excitation type AC-DC voltage conversion circuit, is characterized in that, described circuit comprises:
Limit, source power tube, coil, secondary power tube; And
Limit, source control unit, for generating limit, source power tube conducting described in fixing ON time signal controlling, one-pulse time signal is generated after the power tube conducting of limit, described source, at the end of described pulse period signal limit, described source power tube turn off, and by described coil control its secondary inductance carry out voltage transitions export VD;
Voltage sampling unit, for sampling to described VD, generates sampled voltage;
Secondary control unit, for generating according to described sampled voltage the conducting that switch frequency signal controls described secondary power tube, controls the conducting again of limit, described source power tube after the conducting of described secondary power tube;
Described circuit also comprises:
Input capacitance Cin, output capacitance Cout, resistance R3 and diode D1;
The Same Name of Ends of limit, described coil source inductance is the input connection input voltage of described circuit, the Same Name of Ends of limit, described coil source inductance is also by described input capacitance Cin ground connection, the different name end of limit, described coil source inductance is connected with the input of limit, described source control unit and the input of limit, described source power tube simultaneously, the output head grounding of limit, described source power tube, the output of limit, described source control unit is connected with the control end of limit, described source power tube, and the control end of limit, described source power tube is also connected with the feedback end of limit, described source control unit;
The different name end of described coil secondary inductance is the output output VD of described circuit, the different name end of described coil secondary inductance is also by described output capacitance Cout ground connection, the different name end of described coil secondary inductance is also connected with the input of described voltage sampling unit, the output of described voltage sampling unit is connected with the input of described secondary control unit, the output of described secondary control unit is connected with the control end of described secondary power tube, the input of described secondary power tube is connected with one end of described resistance R3, the other end of described resistance R3 is connected with the Same Name of Ends of described coil secondary inductance and the negative electrode of described diode D1 simultaneously, the anode of described diode D1 and the output of described secondary power tube ground connection simultaneously.
2. circuit as claimed in claim 1, it is characterized in that, described pulse period signal is the negative-going pulse signal be directly proportional to described input voltage.
3. circuit as claimed in claim 1, it is characterized in that, described source limit power tube and described secondary power tube are N-type metal-oxide-semiconductor, the drain electrode of described N-type metal-oxide-semiconductor is the input of described source limit power tube and described secondary power tube, the source electrode of described N-type metal-oxide-semiconductor is the output of described source limit power tube and described secondary power tube, and the grid of described N-type metal-oxide-semiconductor is described source limit power tube and described secondary power tube control end.
4. circuit as claimed in claim 1, it is characterized in that, limit, described source control unit comprises:
Logic control module, for generating limit, source power tube conducting described in fixing ON time signal controlling;
First comparison module, for the input terminal voltage of limit, described source power tube is compared with ground voltage, formation logic digital signal;
ON time generation module, for generating ON time signal, exports fixing ON time signal for described Logic control module according to described logic digital signal and the adjustment of described ON time signal;
The input of described first comparison module is the input of limit, described source control unit, the output of described first comparison module is connected with the first input end of described Logic control module, the output of described Logic control module is the output of limit, described source control unit, the input of described ON time generation module is the feedback end of limit, described source control unit, and the described output of ON time generation module is connected with the second input of described Logic control module.
5. circuit as claimed in claim 4, it is characterized in that, described first comparison module is comparator, the reverse input end of described comparator is the input of described first comparison module, the positive input ground connection of described comparator, the output of described comparator is the output of described first comparison module.
6. circuit as claimed in claim 4, it is characterized in that, described Logic control module is rest-set flip-flop, the S end of described rest-set flip-flop is the first input end of described Logic control module, the R end of described rest-set flip-flop is the second input of described Logic control module, and the Q end of described rest-set flip-flop is the output of described Logic control module.
7. circuit as claimed in claim 1, it is characterized in that, described voltage sampling unit comprises:
Resistance R1, resistance R2;
One end of described resistance R1 is the input of described voltage sampling unit, and the other end of described resistance R1 is that the output of described voltage sampling unit is by described resistance R2 ground connection.
8. circuit as claimed in claim 1, it is characterized in that, described secondary control unit comprises:
Current source, voltage source, adder and the second comparison module;
The input of described current source connects supply voltage, the output of described current source is connected with the first input end of adder, second input of described adder is the input of described secondary control unit, the output of described adder is connected with the first input end of described second comparison module, second input of described second comparison module is connected with the positive pole of described voltage source, the minus earth of described voltage source, the output of described second comparison module is the output of described secondary control unit.
9. circuit as claimed in claim 8, it is characterized in that, described second comparison module is comparator, the reverse input end of described comparator is the first input end of described second comparison module, the positive input of described comparator is the second input of described second comparison module, and the output of described comparator is the output of described second comparison module.
10. an inverse-excitation type electric pressure converter, is characterized in that, described inverse-excitation type electric pressure converter comprises the inverse-excitation type AC-DC voltage conversion circuit as described in any one of claim 1 to 9.
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|---|---|---|---|
| CN201511032395.4A CN105471291B (en) | 2015-12-31 | 2015-12-31 | A kind of inverse-excitation type AC-DC voltage conversion circuits and inverse-excitation type electric pressure converter |
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| CN201511032395.4A CN105471291B (en) | 2015-12-31 | 2015-12-31 | A kind of inverse-excitation type AC-DC voltage conversion circuits and inverse-excitation type electric pressure converter |
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| CN107196272A (en) * | 2017-07-07 | 2017-09-22 | 成都启臣微电子股份有限公司 | A kind of continuous protection device of Switching Power Supply armature winding peak point current depth |
| CN107196272B (en) * | 2017-07-07 | 2018-12-07 | 成都启臣微电子股份有限公司 | A kind of continuous protective device of Switching Power Supply armature winding peak point current depth |
| US11476768B2 (en) | 2020-02-19 | 2022-10-18 | Alpha And Omega Semiconductor International Lp | Flyback converter for controlling on time variation |
| US11664734B2 (en) | 2020-02-19 | 2023-05-30 | Alpha And Omega Semiconductor International Lp | Flyback converter for controlling on time variation |
| TWI761840B (en) * | 2020-05-22 | 2022-04-21 | 加拿大商萬國半導體國際有限合夥公司 | Flyback converter for controlling on-time variation |
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|---|---|
| CN105471291B (en) | 2018-07-20 |
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