CN102820796B - Power supply conversion module - Google Patents
Power supply conversion module Download PDFInfo
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- CN102820796B CN102820796B CN201110152136.0A CN201110152136A CN102820796B CN 102820796 B CN102820796 B CN 102820796B CN 201110152136 A CN201110152136 A CN 201110152136A CN 102820796 B CN102820796 B CN 102820796B
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Abstract
The invention provides a power supply conversion module which is a full digital module and comprises a reference voltage generating unit, a voltage loop control unit, a current loop control unit, an input voltage compensation unit and a pulse width modulation generating unit. According to the power supply conversion module, an external driver is used for driving a bridge switch unit to convert an input power supply into a stable output power supply so as to supply power for an external loading device; and the voltage loop control unit and the current loop control unit are provided with proportional integral differentiators and used for receiving signals relevant to current and voltage of the loading device to form a voltage control loop and a current control loop, and the pulse width modulation generating unit has a function of setting required dead time and is used for improving qualities of the output power supply and reducing influences of the input power supply and loading changes so as to provide a stable sine wave output power supply for the external loading device.
Description
Technical field
The present invention relates to a kind of power transfer module, particularly relate to proportion of utilization integral-derivative controller and form voltage circuit control unit and current circuit control unit to improve out-put supply quality and to reduce the impact of input power and load variations.
Background technology
Inverter (Inverter) is otherwise known as frequency converter, inverter or electric pressure converter, it is a kind of electric device that DC power conversion can be become alternating current, there is the characteristic of variable ac frequency, in order to power supply to the device needing alternating current to operate, the power switching module of such as solar cell, the power switching module of wind power generation, alternating current motor power supply unit, the backlight module of liquid crystal panel, charger, UPS.
In prior art, the function that inverter general voltage or current circuit control, to obtain stable out-put supply, but, the shortcoming of prior art is that out-put supply is subject to momentary load variable effect, that is dynamic response is not enough, the compensation ability especially for nonlinear effect is not good, causes load device to lose efficacy or damages.Therefore, the power transfer module needing a kind of double loop of the voltage circuit control unit and current circuit control unit with proportional-integral-differential structure to control, uses the problem solving above-mentioned prior art.
Summary of the invention
Main purpose of the present invention is to provide a kind of power transfer module, this power transfer module is full digital module, comprise reference voltage generation unit, voltage circuit control unit, current circuit control unit, input voltage compensation unit and pulse width modulation generation unit, in order to coordinate outside pulse width modulation driver and the bridge switch unit of full-bridge or half-bridge, and input power is converted to stable out-put supply to supply outside load device.
Reference voltage generation unit foundation DC input voitage is to produce reference voltage, voltage circuit control unit receives external voltage and outside first electric current, and according to reference voltage to produce reference current, current circuit control unit receives external voltage and outside second electric current, and according to reference current to produce the first utility voltage, input voltage compensation unit receives external dc voltage and according to the first utility voltage to produce the second utility voltage, pulse width modulation generation unit receives the second utility voltage, to produce pulse width modulation signal, the pulse width modulation signal of pulse width modulation generation unit is supplied to external driver device and receives in order to control outside switch element, and then provide stable sine wave to supply power supply to the external loading being connected to switch element.
Therefore, power transfer module of the present invention operates in a digital manner, there is very high operational stability and reliability, the interference of external noise can be reduced, use the voltage control loop and electric current control loop that are formed respectively by voltage circuit control unit and current circuit control unit simultaneously, and pulse width modulation generation unit has the function of setting required dead time, use and improve out-put supply quality and the impact reducing input power and load variations, be well suited for being applied to power supply change-over device, such as online UPS (Online UPS), solar power supply system, wind power generation power-supply system or alternating current motor power supply.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of power transfer module of the present invention;
Fig. 2 is the application schematic diagram of power transfer module of the present invention;
Fig. 3 is the functional block diagram of reference voltage generator in power transfer module of the present invention;
Fig. 4 is the functional block diagram of voltage circuit controller in power transfer module of the present invention;
Fig. 5 is the functional block diagram of current circuit controller in power transfer module of the present invention;
Fig. 6 is the functional block diagram of input voltage compensation device in power transfer module of the present invention; And
Fig. 7 is the functional block diagram of PWM generation unit in power transfer module of the present invention.
Embodiment
Below coordinate Figure of description to do more detailed description to embodiments of the present invention, can implement according to this after studying this specification carefully to make those skilled in the art.
With reference to the schematic diagram that figure 1, Fig. 1 is power transfer module of the present invention.As shown in Figure 1, power transfer module 1 of the present invention comprises reference voltage generation unit 10, voltage circuit control unit 20, current circuit control unit 30, input voltage compensation unit 40 and pulse width modulation (PWM) generation unit 50, wherein all unit realize with digital design, that is power transfer module of the present invention 1 is not containing analog circuit.
Reference voltage generation unit 10 receives external voltage VO, according to DC input voitage VDC and with reference to AC-input voltage VAC to produce reference voltage S1, voltage circuit control unit 20 receives external voltage VO and the first foreign current I1, and according to reference voltage S1 to produce reference current S2, current circuit control unit 30 receives external voltage VO and the second foreign current I2, and according to reference current S2 to produce the first utility voltage S3, input voltage compensation unit 40 receive external dc voltage VB and according to the first utility voltage S3 to produce the second utility voltage S4, pulse width modulation generation unit 50 receives the second utility voltage S4, to produce pulse width modulation (PWM) signal S5.
With reference to the application schematic diagram that figure 2, Fig. 2 is power transfer module of the present invention.It should be noted that, for clearly demonstrating feature of the present invention, part application circuit is omitted in Fig. 2, the analog-to-digital converter such as inputted for analog signal and export and digital to analog converter, especially, therefore and be not used to limit scope of the present invention Fig. 2 is the possible application explaining power transfer module of the present invention in the mode of exemplary embodiment and the effect that can reach.
As shown in Figure 2, the pwm signal S5 that power transfer module 1 of the present invention produces provides pwm driver DVR, use the grid driving four-wheel drive transistor M1, M2, M3 and M4 in bridge-type switch element, and then utilize filter inductance L and filter capacitor C to produce stable out-put supply with power supply to load device RL.The drain of driving transistors M1, M3 connects high direct voltage voltage VB, and the source electrode of driving transistors M3 connects filter inductance L, and filter capacitor C connects filter inductance L, and filter capacitor C is connected in parallel load device RL.Second foreign current I2 can be the switched output current or the electric current relevant to switched output current that flow through switch element, such as flow through the portion of electrical current of the electric current of filter inductance L, and the first foreign current I1 can be the load current or the electric current relevant to load current that flow through load device, such as flowing through the electric current of filter inductance L and flowing through the difference electric current of electric current of filter capacitor C, and external voltage VO refers to the terminal voltage of load device RL or the voltage relevant to this terminal voltage, AC-input voltage VAC can be civil power, the flip-flop voltage that DC input voitage VDC exports for power transfer module.
Therefore, power transfer module 1 of the present invention can utilize the first foreign current I1, the second foreign current I2 and external voltage VO and control pwm signal S5, use and form feedback circuit controls mechanism, can guarantee that driving transistors M1 ~ M4 can provide stable out-put supply to load device RL.
Below by graphic with the operation describing internal element of the present invention in detail and feature for cooperation.
With reference to the functional block diagram that figure 3, Fig. 3 is reference voltage generator in power transfer module of the present invention.As shown in Figure 3, reference voltage generator 10 comprises root mean square (RMS) magnitude calculator 11, chase after phase waveform generator 13, reference voltage buffer 15 and reference voltage multiplexer 17, wherein RMS magnitude calculator 11 receives external voltage VO to calculate and to produce RMS amplitude, chase after phase waveform generator 13 and receive DC input voitage VDC and AC-input voltage VAC, and according to RMS amplitude, reference voltage VRAC is exchanged to produce, and reference voltage multiplexer 17 receives the DC reference voltage VRDC exchanging reference voltage VRAC and reference voltage buffer 15, and select signal SELR according to the reference of reference voltage buffer 15, exchange reference voltage VRAC or DC reference voltage VRDC and be used as reference voltage S1 to choose and send out.
Above-mentioned RMS magnitude calculator 11 mainly comprises calculator and compensating controller (not shown), and wherein compensating controller can be one of them of proportional controller, proportional-plus-integral controller and proportional-integral-differential (PID) controller.The default root-mean-square value that calculator utilizes reference voltage buffer 15 to preset and compare to produce RMS error amount with the RMS value of external voltage VO, corresponding compensatory control is carried out again by compensating controller, such as proportional compensation control, proportional, integral compensatory control or proportional-integral-differential compensatory control, use and convert required RMS amplitude to.
Chase after phase waveform generator 13 and comprise phase hunter, waveform generator, compensating controller and calculator (above unit does not show in the drawings), wherein phase hunter compares AC-input voltage VAC and external voltage VO to produce corresponding phase signal, waveform generator chooses signal according to the waveform of reference voltage buffer 15, to produce corresponding sine wave signal, and phase signal is in order to control the frequency of sine wave signal, and sine wave signal is multiplied by the RMS amplitude of RMS magnitude calculator 11, produce reference waveform.Compensating controller can be one of them of proportional controller, proportional-plus-integral controller and proportional-integral-differential (PID) controller.The DC compensation that compensating controller receives DC input voitage VDC and reference voltage buffer 15 controls default value, mat compensates control (such as proportional compensation control, proportional, integral compensatory control or proportional-integral-differential compensatory control) and produces DC compensation controlling value, and DC compensation controlling value adds that reference waveform exchanges reference voltage VRAC to produce.
With reference to the functional block diagram that figure 4, Fig. 4 is voltage circuit controller in power transfer module of the present invention.As shown in Figure 4, voltage circuit controller 20 of the present invention comprises voltage circuit operation processing unit 21, nonlinear load controller 23 and voltage circuit buffer 27.Voltage circuit operation processing unit 21 receives external voltage VO and reference voltage S1, and carries out subtracting each other rear generation reference error value, and is sent to nonlinear load controller 23.Nonlinear load controller 23 according to the nonlinear load controller parameter of this voltage circuit buffer 27, and carries out nonlinear load control to reference error value, exports, be applicable to nonlinear load to produce nonlinear Control.Voltage circuit operation processing unit 21 receives nonlinear Control and exports, and with the compensatory control parameter (such as scale parameter, integral parameter and differential parameter at least one of them) according to voltage circuit buffer 27 to carry out corresponding compensatory control (such as proportional compensation controls, proportional, integral compensatory control or proportional-integral-differential compensatory control), and then produce compensatory control and export.Compensatory control exports chooses signal to determine whether carry out Current Decoupling for the first foreign current 11 according to the Current Decoupling of voltage circuit buffer 27 further, if do not carry out Current Decoupling, then PID directly exports and is used as reference current S2 by voltage circuit operation processing unit 21, and if Current Decoupling will be carried out, then voltage circuit operation processing unit 21 by PID export add that the first foreign current I1 is to produce reference current S2.
With reference to the functional block diagram that figure 5, Fig. 5 is current circuit controller in power transfer module of the present invention.As shown in Figure 5, current circuit controller 30 of the present invention comprises current circuit operation processing unit 31, compensating controller 33, current circuit filter 35 and current circuit buffer 37.Current circuit operation processing unit 31 receives the reference current S2 of the second foreign current I2 and voltage circuit controller 20, and carry out subtracting each other with generation current error amount, and current error value (is such as proportional controller by compensating controller 33 further, one of them of proportional-plus-integral controller and proportional-integral derivative controller) according to the current error compensatory control parameter of current circuit buffer 37 to compensate control, such as proportional compensation controls, proportional, integral compensatory control, or proportional-integral-differential compensatory control, and then generation current error compensation control exports.Current circuit filter 35 received current error compensation control exports, and the current error filtering parameter of foundation current circuit buffer 37 is to carry out filtering process, and then generation current error filtering value, and is received by current circuit operation processing unit 31.Whether current circuit operation processing unit 31 carries out voltage decoupling according to the voltage decoupling Selecting All Parameters of current circuit buffer 37 with decision, if and do not carry out voltage decoupling, then current error filter value is directly used as the first utility voltage S3 by current circuit operation processing unit 31, and if voltage decoupling will be carried out, then current error filter value is added that external voltage VO is to produce the first utility voltage S3 by current circuit operation processing unit 31.
With reference to the functional block diagram that figure 6, Fig. 6 is input voltage compensation device in power transfer module of the present invention.As shown in Figure 6, input voltage compensation device 40 of the present invention comprises equilibrium amplitude controller 41, input voltage compensation buffer 43 and input voltage compensation multiplexer 45.Equilibrium amplitude controller 41 receives the first utility voltage S3 of external dc voltage VB and current circuit controller 30, and the balance parameters of foundation input voltage compensation buffer 43 and amplitude parameter are to carry out balance control treatment and amplitude controlling process, and then produce voltage compensation value.
Input voltage compensation multiplexer 45 receives the first utility voltage S3 and voltage compensation value, and the voltage compensation Selecting All Parameters of foundation input voltage compensation buffer 43 is to determine the second utility voltage S4, if wherein voltage compensation Selecting All Parameters represents and does not carry out voltage compensation, then direct first utility voltage S3 is used as the second utility voltage S4, if and voltage compensation Selecting All Parameters represents and will carry out voltage compensation, then choose voltage compensation value and be used as the second utility voltage S4.
With reference to the functional block diagram that figure 7, Fig. 7 is PWM generation unit in power transfer module of the present invention.As shown in Figure 7, PWM generation unit 50 of the present invention comprises PWM generator 51 and PWM buffer 53, wherein PWM generator 51 receives the second utility voltage S4, and according to PWM buffer 53 dead time parameter to determine the dead time of pulse width modulation, the horizontal pulse width modulation process and produce pwm signal S5 of going forward side by side.
Above-mentioned reference voltage buffer 15, voltage circuit buffer 27, current circuit buffer 37, input voltage compensation buffer 43 and PWM buffer 53, also partly can be combined into multiple buffer or be all combined into single cache device and realize.
It should be noted that the circuit box in Fig. 3 to Fig. 7 is the exemplary embodiment that feature of the present invention is described, and be not used to limit scope of the present invention, therefore, the present invention includes the mutually reciprocity circuit can reaching required electric function.
Another embodiment of power transfer module of the present invention is at reference voltage generation unit 10, voltage circuit control unit 20, at least one multiplexer is increased in current circuit control unit 30 and input voltage compensation unit 40, in order to the setting according to corresponding buffer for multiple first foreign current, multiple second foreign current, multiple external voltage and multiple external dc voltage, to choose the first required foreign current I1, second foreign current I2, external voltage VO and external dc voltage VB, two the first foreign currents can be had when being such as applied to semibridge system driving framework, two the second foreign currents, two external voltages and two external dc voltages.
The another embodiment of power transfer module of the present invention comprises further is multiplely used as simulation to numeral and numeral to the external analog circuitry of analog-converted interface, wherein simulate to digital translation interface and become digital signal in order to converting analogue signals, and numeral becomes analog signal to analog-converted interface in order to conversion digital signal.
An embodiment again of power transfer module of the present invention can without the process of current circuit operation processing unit 31, also namely walk around current circuit operation processing unit 31 from the reference current S2 of voltage circuit control unit 20 and directly received by input voltage compensation unit 40, or current circuit operation processing unit 31 is directly converted to the first utility voltage S3 with reference to electric current S2, use and carry out action required, reach best overall transformation efficiency in order to coordinate different application demands.
Feature of the present invention is that power transfer module can realize with Digital Design completely, there is very high operational stability and reliability, and reduce the interference of external noise, also can comprise simulation to realize to numeral and numeral to the analog circuit of analog-converted interface, especially can the inner corresponding temporary set point of mat, to control or to adjust the characteristic of power transfer module, increase the elasticity on using, and then expanded application territory, be well suited for being applied to power supply change-over device, such as online UPS, solar power supply system, wind power generation power-supply system or alternating current motor power supply.
Another feature of the present invention is that voltage circuit control unit and current circuit control unit have proportion integration differentiation device, can set required dead time by the inner corresponding buffer of mat, and then improve sinewave output power supply.
As described above is only to explain preferred embodiment of the present invention; not attempt does any pro forma restriction to the present invention according to this; therefore, all have any modification for the present invention or the change done under identical invention spirit, all must be included in the category that the invention is intended to protect.
Claims (9)
1. a power transfer module, is characterized in that, comprising:
One reference voltage generation unit, receives an external voltage, according to a DC input voitage and with reference to an AC-input voltage to produce a reference voltage;
One voltage circuit control unit, receives this external voltage and one first foreign current, and the reference voltage produced according to this reference voltage generation unit is to produce a reference current;
One current circuit control unit, receives this external voltage and one second foreign current, and the reference current produced according to this voltage circuit control unit is to produce one first utility voltage, or directly this reference current is converted to this first utility voltage;
One input voltage compensation unit, receives an external dc voltage, and the first utility voltage produced according to this current circuit control unit is to produce one second utility voltage; And
One pulse width modulation generation unit, receives the second utility voltage that this input voltage compensation unit produces, to produce a pulse width modulation signal,
Wherein this pulse width modulation signal is supplied to an outside pulse width modulation driver, use and drive an outside switch element, and then produce an out-put supply with power supply to an outside load device, this external voltage is the terminal voltage of this load device or the voltage relevant to this terminal voltage, this first foreign current is flow through a switched output current of this switch element or the electric current relevant to this switched output current, this second foreign current is flow through the load current of this load device or the electric current relevant to this load current, this external dc power voltage supply gives this switch element,
Wherein this reference voltage generation unit comprises a RMS magnitude calculator, one chases after phase waveform generator, one reference voltage buffer and a reference voltage multiplexer, this RMS magnitude calculator receives this external voltage to calculate and to produce a RMS amplitude, this chases after phase waveform generator and receives this DC input voitage and this AC-input voltage, and according to this RMS amplitude to produce an interchange reference voltage, and this reference voltage multiplexer receives the DC reference voltage of this interchange reference voltage and this reference voltage buffer, and according to this reference voltage buffer one with reference to selecting signal to choose this interchange reference voltage or this DC reference voltage is used as this reference voltage.
2. power transfer module as claimed in claim 1, it is characterized in that, this RMS magnitude calculator comprises a calculator and a compensating controller, what this calculator utilized this reference voltage buffer to preset one presets root-mean-square value and comparing with the RMS value of this external voltage, to produce a RMS error amount, and compensate control by this compensating controller and convert this RMS amplitude to, and this compensating controller is proportional controller, proportional-plus-integral controller and proportional-integral derivative controller one of them.
3. power transfer module as claimed in claim 1, it is characterized in that, this chases after phase waveform generator and comprises a phase hunter, one waveform generator, one compensating controller and a calculator, this phase hunter compares this AC-input voltage and this external voltage to produce a corresponding phase signal, this waveform generator chooses signal to produce a corresponding sine wave signal according to a waveform of this reference voltage buffer, and this phase signal is in order to control the frequency of this sine wave signal, and this sine wave signal is multiplied by the RMS amplitude of this RMS magnitude calculator, to produce a reference waveform, this compensating controller receives a direct current compensatory control default value of this DC input voitage and this reference voltage buffer, use and carry out corresponding compensatory control and produce a direct current compensatory control value, and this DC compensation controlling value is added that this reference waveform is to produce this interchange reference voltage, and this compensating controller is proportional controller, one of them of proportional-plus-integral controller and proportional-integral derivative controller.
4. power transfer module as claimed in claim 1, it is characterized in that, this voltage circuit controller comprises a voltage circuit operation processing unit, one nonlinear load controller and a voltage circuit buffer, this voltage circuit operation processing unit receives this external voltage and this reference voltage, and carry out subtracting each other rear generation one reference error value and being sent to this nonlinear load controller, this nonlinear load controller is according to a nonlinear load controller parameter of this voltage circuit buffer, and nonlinear load control is carried out to produce a nonlinear Control output to this reference error value, this voltage circuit operation processing unit receives this nonlinear Control according to this voltage circuit buffer and exports, and according to a compensatory control parameter of this voltage circuit buffer to compensate control, and then produce a compensatory control output, this compensatory control parameter comprises a scale parameter, one integral parameter and a differential parameter at least one of them, this compensatory control exports chooses signal to determine whether carry out Current Decoupling for this first foreign current according to a Current Decoupling of this voltage circuit buffer further, if do not carry out Current Decoupling, then this compensatory control directly exports and is used as this reference current by this voltage circuit operation processing unit, and if Current Decoupling will be carried out, then this compensatory control exports and adds that this first foreign current is to produce this reference current by this voltage circuit operation processing unit.
5. power transfer module as claimed in claim 1, it is characterized in that, this current circuit controller comprises a current circuit operation processing unit, one compensating controller, one current circuit filter and a current circuit buffer, this current circuit operation processing unit receives this second foreign current and this reference current, and carry out subtracting each other to produce a current error value, and this current error value by this compensating controller according to a current error parameter of this current circuit buffer to compensate control, and then produce a current error compensatory control output, and this compensating controller is proportional controller, one of them of proportional-plus-integral controller and proportional-integral derivative controller, this current circuit filter receives this current error compensatory control and exports, and according to a current error filtering parameter of this current circuit buffer to carry out filtering process, and then produce a current error filter value, and received by this current circuit operation processing unit, whether this current circuit operation processing unit carries out voltage decoupling according to a voltage decoupling Selecting All Parameters of this current circuit buffer with decision, if and do not carry out voltage decoupling, then this current error filter value is directly used as this first utility voltage by this current circuit operation processing unit, and if voltage decoupling will be carried out, then this current error filter value is added that this external voltage is to produce this first utility voltage by this current circuit operation processing unit.
6. power transfer module as claimed in claim 1, it is characterized in that, this input voltage compensation device comprises an equilibrium amplitude controller, one input voltage compensation buffer and an input voltage compensation multiplexer, this equilibrium amplitude controller receives this external dc voltage and this first utility voltage, and according to a balance parameters of this input voltage compensation buffer and an amplitude parameter to carry out balance control treatment and amplitude controlling process, and then produce a voltage compensation value, this input voltage compensation multiplexer receives this first utility voltage and this voltage compensation value, and according to a voltage compensation Selecting All Parameters of this input voltage compensation buffer to determine this second utility voltage, if and this voltage compensation Selecting All Parameters represents and does not carry out voltage compensation, then direct this first utility voltage is used as this second utility voltage, if and this voltage compensation Selecting All Parameters represents and will carry out voltage compensation, then choose this voltage compensation value and be used as this second utility voltage.
7. power transfer module as claimed in claim 1, it is characterized in that, this pulse width modulation generation unit comprises a PWM generator and a PWM buffer, this PWM generator receives this second utility voltage, and according to this PWM buffer one dead time parameter produce this pulse width modulation signal to carry out pulse width modulation process.
8. as claim 1,3,6, power transfer module according to any one of 7, it is characterized in that, this reference voltage generation unit, this voltage circuit control unit, this current circuit control unit and this input voltage compensation unit comprise at least one multiplexer further, in order to the setting according to corresponding buffer for multiple first foreign current, multiple second foreign current, multiple external voltage and multiple external dc voltage, to choose this required first foreign current, this second foreign current, this external voltage and this external dc voltage.
9. power transfer module as claimed in claim 1, is characterized in that, comprises multiple simulation further to digital translation interface and multiple numeral to analog-converted interface, become digital signal, and conversion digital signal becomes analog signal in order to converting analogue signals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110152136.0A CN102820796B (en) | 2011-06-08 | 2011-06-08 | Power supply conversion module |
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| CN201110152136.0A CN102820796B (en) | 2011-06-08 | 2011-06-08 | Power supply conversion module |
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| CN102820796A CN102820796A (en) | 2012-12-12 |
| CN102820796B true CN102820796B (en) | 2015-04-01 |
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| CN107086601B (en) * | 2017-05-18 | 2020-04-21 | 华为技术有限公司 | Photovoltaic power generation system and voltage compensation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1421977A (en) * | 2001-11-22 | 2003-06-04 | 台达电子工业股份有限公司 | Parallel DC-AC voltage converter system and its control method |
| CN1421987A (en) * | 2001-11-22 | 2003-06-04 | 台达电子工业股份有限公司 | DC-to-AC voltage conversion circuit and its control method |
| CN1610234A (en) * | 2003-10-24 | 2005-04-27 | 力博特公司 | UPS inverter and its pulse width modulation dead-zone compensation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7787263B2 (en) * | 2007-05-18 | 2010-08-31 | Texas Instruments Incorporated | Methods and apparatus to control a digital power supply |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1421977A (en) * | 2001-11-22 | 2003-06-04 | 台达电子工业股份有限公司 | Parallel DC-AC voltage converter system and its control method |
| CN1421987A (en) * | 2001-11-22 | 2003-06-04 | 台达电子工业股份有限公司 | DC-to-AC voltage conversion circuit and its control method |
| CN1610234A (en) * | 2003-10-24 | 2005-04-27 | 力博特公司 | UPS inverter and its pulse width modulation dead-zone compensation method |
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