CN101527514A - Direct current power supply - Google Patents
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- CN101527514A CN101527514A CN200810101326A CN200810101326A CN101527514A CN 101527514 A CN101527514 A CN 101527514A CN 200810101326 A CN200810101326 A CN 200810101326A CN 200810101326 A CN200810101326 A CN 200810101326A CN 101527514 A CN101527514 A CN 101527514A
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Abstract
The invention discloses a direct current power supply, which comprises a rectifying unit, an inverter unit, an output rectifying unit, a detection unit and a DSP processor, wherein the detection unit is arranged at the downstream of the output rectifying unit to detect a voltage transmitted by an output filter unit to a load and transmits a detected value to the DSP processor; and the DSP processor is arranged between the detection unit and the inverter unit to output a corresponding PWM control signal according to the detected value of the voltage of the load and an expected value input in advance of the load to the inverter unit to control the on and off of a switch element in the inverter unit and to adjust the dutyfactor of the switch element in the inverter unit to adjust the output voltage of the inverter unit to allow to the detected value of the load to approach the expected value of the voltage of the load. The output voltage of the direct current power supply is high in quality and small in harmonic content and interference, so the direct current power supply meets the electricity use requirements of precise instruments and effectively avoids damages to the precise instruments caused by power supply quality.
Description
Technical field
The present invention relates to electronic technology field, in particular to a kind of DC power supply.
Background technology
As everyone knows, in semiconductor equipment, usually be provided with or dispose some precision instruments, such as high vacuum rule and mass flowmenter (MFC, Mass Flow Controller).These precision instruments are powered to it by DC power supply usually.At present, DC power supply can be divided into linear power supply and Switching Power Supply according to its basic functional principle.
Wherein, as shown in Figure 1, linear power supply mainly comprises Industrial Frequency Transformer, output rectifier filter, control circuit (figure does not show) and protective circuit (figure does not show) etc.Usually, the course of work of linear power supply is: by Industrial Frequency Transformer the alternating current of importing is carried out transformation earlier, then carry out rectifying and wave-filtering through the output rectifier filter again, to obtain needed direct voltage.
At present, the technology of linear power supply is comparatively ripe, can reach very high stability, and ripple is also very little, and the interference and the noise that do not have Switching Power Supply to have.But in actual applications, there is such shortcoming in it: one because the volume of filter capacitor in the rectification circuit and transformer is bigger, thereby causes whole power volume huge and heavy; They are two years old, voltage feedback circuit in the linear power supply is usually operated at linear condition, there is certain voltage drop on its adjustment pipe and causes certain power consumption, especially when the big operating current of output, the power consumption of adjusting pipe is bigger usually, thereby cause conversion efficiency low, and power consumption also causes the heat that produces more greatly, and this just need to install very big fin.
In view of linear power supply above-mentioned shortcoming in actual use, it is replaced by Switching Power Supply.
As shown in Figure 2, Switching Power Supply mainly comprises input rectification circuit, converter, output rectification circuit.Wherein, the effect of above-mentioned various piece with operation principle is: input rectification circuit carries out rectifying and wave-filtering to exchanging input, will exchange input and become direct voltage, and be input to converter.Converter is transformed into high-frequency alternating current with direct current, and passes through the switching frequency of power controlling field effect transistor, and the size of regulating output dc voltage that is to say that AC-input voltage becomes great direct voltage and finished by this one; Converter can also play the effect that output and input electrical network are isolated in addition.Output rectification circuit is with the high-frequency ac voltage rectifying and wave-filtering of converter output, with the direct voltage that needing to obtain; Simultaneously, output rectification circuit also prevents the interference of high-frequency noise to load.
By foregoing description as can be seen, the course of work of Switching Power Supply generally includes following three processes: promptly, interchange becomes direct current, and direct current becomes required interchange, then this interchange is carried out filtering to obtain required direct current.
With respect to linear power supply, advantages such as the regular tap power supply has that volume is little, in light weight, self strong interference immunity, output voltage range are wide, modularization, however in actual applications, its shortcoming also is tangible, for example, ripple is big, output harmonic wave content is abundant, bigger to load effect.
Yet in actual applications, precision instrument requires usually also than higher the ripple of DC power supply, and for example, the instrument that has requires ripple less than 20mv.Yet general Switching Power Supply ripple is 1%, that is to say, for the Switching Power Supply of 15v, its ripple is approximately 150mv, and this can not satisfy above-mentioned requirements.
For this reason, people attempt to seek a kind of DC power supply that can satisfy the precision instrument power reguirements always.For example, prior art is once a kind of so improved DC power supply is provided.Particularly, this improved DC power supply increases simple filter circuit on the basis of regular tap power supply shown in Figure 2, like this, the output signal of Switching Power Supply shown in Figure 2 transfers to this simple filter circuit, by this filter circuit it is carried out filtering, and directly export filtered voltage to the precision instrument even load, so that these precision instruments are powered.In other words, prior art one is exactly that the voltage signal that the regular tap power supply is exported is carried out filtering and after reducing ripple, offers these precision instrument even loads again through filter circuit.
In actual applications, although this DC power supply can reduce ripple, and the quality of output voltage improved to some extent, yet still there is such deficiency in it: promptly, the DC power supply that prior art one provides adopts open loop control mode, that is to say that signal is an one-way flow, particularly, electric power signal is through input rectification circuit--just directly exports the precision instrument even load to behind converter--output rectification circuit---output filter circuit.Like this, in above-mentioned signal flow, the signal of telecommunication of downstream part can be subjected to the influence of upstream portion, and the signal of telecommunication of upstream portion is then irrelevant with the downstream part, can not be subjected to the influence of downstream part.In this case, this DC power supply can only be controlled its actual voltage that outputs in the load according to its desired value of desiring to output to the voltage of load.Yet, each link in the above-mentioned open loop control flow all might produce power loss, the power loss of filter circuit self particularly, therefore, only control the output of this DC power supply according to the desired value of input in advance, then can cause existing between the real output value of this DC power supply and its desired value bigger deviation, in other words, will make and exist between the voltage that outputs on the precision instrument even load and its desired value than large deviation, make this DC power supply still have bigger ripple, and the output voltage precision is lower, so just makes load influence work because of the operating voltage that can not get expecting, even causes the damage of this load.
Summary of the invention
For solving the problems of the technologies described above, the invention provides the DC power supply that a kind of ripple is little, interference is less.The voltage accuracy of this power supply output is higher, can satisfy the needs of equipment such as precision instrument.
For this reason, the invention provides a kind of DC power supply, it comprises input rectifying unit, inversion unit and output rectification unit, wherein, described input rectifying unit is used for the alternating current from electrical network is carried out rectification, being converted into direct current, and described direct current is transferred to inversion unit; Described inversion unit is used for described direct current is carried out inverse transformation, being converted into alternating current, and described alternating current is transferred to the output rectification unit; Described output rectification unit is used for the alternating current from described inversion unit is carried out rectification, to be converted into direct current and to export to load.And described DC power supply also comprises detecting unit and dsp processor, and wherein, described detecting unit is arranged on the downstream of described output rectification unit, detects in order to the voltage that the output filter unit is transferred to load, and detected value is transferred to dsp processor; Described dsp processor is arranged between described detecting unit and the inversion unit, in order to export corresponding PWM to described inversion unit according to the load voltage desired value of the detected value of described load voltage and input in advance, break-make with switching device in the control inversion unit, adjust its duty ratio, and then adjust the output voltage of inversion unit, so that the detected value of load voltage levels off to the desired value of load voltage.
Preferably, described DC power supply also comprises the output filter unit, and it is arranged on the downstream of described output rectification unit, in order to the direct current from described output rectification unit is carried out filtering, and exports filtered direct current to load and described detecting unit.
Wherein, described output filter unit comprises the LC filter.
Wherein, described dsp processor adopts the TMS320LF2407 of TI company or the processor of TMS320F240 or TMS320C2812 model.
Preferably, described inversion unit comprises n the inversion submodule of series connection mutually, stagger the mutually electrical degree of 360 °/n of the intercarrier of described n inversion submodule, thereby the level number that makes inverter voltage increases and its total voltage value is constant, with the dv/dt value of the pulse-width modulation waveform that reduces inverter voltage, and then reduce harmonic content in the inverter voltage, improve the quality of output voltage, wherein, n is the integer more than or equal to 2.
Wherein, the quantity of described inversion submodule is 2, and the modulating wave of described 2 inversion submodules is identical, and carrier wave differs 180 °, and the level number of inverter voltage increases to 4 and its total voltage value remains unchanged.
Wherein, switching element T 1 and T3 in the first inversion submodule connect mutually, and switching element T 2 and T4 connect mutually; Switching element T 5 and T7 in the second inversion submodule connect mutually, switching element T 6 and T8 connect mutually, and link to each other with serial connection point between switching element T 5 and the T7 by the serial connection point between switching element T 2 and the T4 and to realize that the described first inversion submodule and the second inversion submodule connect mutually; Serial connection point between switching element T 1 and the T3 is exported mutually as the U of described inversion unit, and the serial connection point between switching element T 6 and the T8 is exported mutually as the V of described inversion unit.
Wherein, described switching device comprises triode, field effect transistor, thyristor.
Wherein, the upstream of described inversion unit also comprises the bleeder circuit of being made up of several division module, and the quantity of described division module is corresponding with the quantity of inversion submodule, and the voltage that each division module is obtained offers corresponding inversion submodule.
Wherein, described division module comprises electric capacity or electric resistance partial pressure device.
With respect to prior art, the present invention has following beneficial effect:
Because comprise feedback control loop in the DC power supply provided by the invention, particularly, this DC power supply comprises detecting unit and dsp processor, this detecting unit exports the voltage actual value of load in order to detection, and transmits it to dsp processor; Dsp processor is used for controlling inversion unit switching device break-make according to load voltage actual value and desired value thereof, thereby adjusts the output of this DC power supply.Like this, although each link in the control loop all might produce power loss, but this dsp processor can be controlled the break-make of switching device in the inversion unit according to load voltage actual value and desired value thereof, rather than only controls the break-make of switching device in the inversion unit according to the desired value of predefined load voltage.Therefore, can make the voltage actual value that exports load to level off to its desired value by this control mode, and reduce the ripple of output voltage, and then the quality of raising output voltage, so that provide the voltage that satisfies its job requirement to supply with to the precision instrument even load, guaranteeing this load operate as normal, and avoid supplying with the damage that causes because of voltage.
In addition, in a preferred embodiment of the invention, inversion unit comprises at least two inversion submodules of series connection mutually, and unlike inversion unit of the prior art, only comprise an inversion submodule, therefore, the intercarrier of a plurality of inversion submodules in the preferred embodiment certain electrical degree that staggers mutually, can make inverter voltage like this under the constant prerequisite of its total voltage value, increase its level number, thereby reduce the dv/dt value of the PWM waveform of inverter voltage, and then the harmonic content in the minimizing inverter voltage, so just can make the quality of voltage of DC power supply output higher, disturb less.Like this, the electricity consumption requirement of precision instrument not only can be satisfied, but also the damage that precision instrument caused because of the power supply quality problem can be avoided effectively.
Description of drawings
Fig. 1 is the operation principle schematic diagram of prior art neutral line power supply;
Fig. 2 is the operation principle schematic diagram of Switching Power Supply in the prior art;
Fig. 3 is the inverter voltage PWM waveform schematic diagram of Switching Power Supply shown in Figure 2;
The theory diagram of the DC power supply that Fig. 4 provides for first embodiment of the invention;
The partial circuit figure of the DC power supply that Fig. 5 provides for second embodiment of the invention; And
Fig. 6 is the PWM waveform schematic diagram of DC power supply shown in Figure 5.
Embodiment
Key point of the present invention is that the Switching Power Supply that prior art provides is improved, particularly,
The present invention controls the voltage that the DC power supply output ripple is little, precision is high by adopting the closed-loop control strategy, to improve the power supply quality of power supply, reduces the adverse effects such as interference to load.
For making those skilled in the art person understand technical scheme of the present invention better, DC power supply provided by the invention is described in detail below in conjunction with accompanying drawing.
See also Fig. 4, DC power supply 100 provided by the invention mainly comprises: inversion unit 110, output filter unit 120, detecting unit 130 and dsp processor 140.
Wherein, 110 pairs of civil powers after over commutation, dividing potential drop of this inversion unit carry out inverse transformation, and the alternating current after the inversion is transferred to output filter unit 120.
The voltage that 130 pairs of output of detecting unit filter unit 120 offers load 200 detects, and detected value is transferred to dsp processor 140.In actual applications, this detecting unit 130 for example can adopt divider resistance to detect such mode.
Detected value and its desired value that dsp processor 140 offers this DC power supply 100 voltage of load 200 compare, and export control signals according to the difference of the two to inversion unit 110.That is to say, dsp processor 140 is according to the detected value of load voltage and desired value and the drive circuit in inversion unit 110 sends corresponding PWM, after this signal waits processing through amplification, directly control inversion unit 110 in switching device break-make (promptly, the maintained switch frequency is constant and adjust turn-on time of switching device, just adjust its duty ratio), thereby adjust the size of the output voltage of inversion unit 110, and then regulate the size of the direct voltage of whole DC power supply 100 outputs.Particularly, when the detected value of load voltage during less than its desired value, this dsp processor 140 increases duty ratio in real time, increasing the voltage of inversion unit 110 outputs, and then increases the output valve of this DC power supply 100.By this closed-loop control, the detected value that can make this DC power supply 100 offer the voltage of load 200 levels off to its desired value gradually.
In actual applications, dsp processor 140 for example can adopt the processor of the following model of TI company: TMS320LF2407, TMS320F240 and TMS320C2812 etc.These processors aim at real time signal processing and design, and the execution speed of 30MIPS (Million Instructions Per Second, 1,000,000 instructions each second) makes the instruction cycle can shorten to 33ns; 10 A/D converter minimum transition times are 500ns, and have two task manager modules (EVA and EVB), and wherein each task manager module comprises 8 16 pulse-width modulation passage.Processor with above-mentioned performance parameter can integrate processing capability in real time and peripheral functionality, is the preferred version of high speed, real-time processor.
In fact, although adopted dsp processor in the previous embodiment, yet processor is not limited to this type of dsp processor in actual applications, but also can adopt the processor of other types, as long as it can finish the control corresponding function.
As everyone knows, the inverter voltage of regular tap power supply is the PWM waveform, and what it adopted is PWM (Pulse Width Modulation, pulse width modulation) control, i.e. pulse width modulation control.Adopt this control method, switching frequency keeps constant and length turn-on time is variable, and the switch connection time accounts for the ratio in whole cycle in the one-period, is called duty ratio.Adjust duty ratio and can adjust the size of output voltage.And by the Fourier formula analysis as can be known, the PWM voltage waveform contains a large amount of high order harmonic components, and the generation of high order harmonic component mainly is because very high the causing of dv/dt of PWM waveform.These harmonic waves reduce the quality of this switch power source output voltage, and influence the performance of output dc voltage, thereby the system that uses this Switching Power Supply is caused immeasurable loss.
For this reason, as preferred implementation of the present invention, inversion unit wherein can be made up of at least two inversion submodules, that is to say, the inversion unit of this DC power supply adopts many level phase shift PWM technology, promptly, comprise a plurality of inversion submodules in the inversion unit, the inversion submodule of same phase is exported the fundamental voltage of identical amplitude and phase place, certain electrical degree but the intercarrier of a plurality of inversion submodules of mutual series connection staggers mutually, and realize many level PWMs, this makes that the level number of inverter voltage increases but the total voltage value is constant, thereby reduces the dv/dt of PWM waveform greatly.In this case, if comprise n the inversion submodule of series connection mutually in the inversion unit, then the dv/dt of PWM waveform will have only original 1/n, and like this, harmonic content will reduce greatly, thereby improve power quality.
Particularly, see also Fig. 5, the inversion unit in the present embodiment is by two inversion submodules, that is, the first inversion submodule 510 and the second inversion submodule 520 are in series.Civil power carries out dividing potential drop by two equivalent capacitance C1 and C2 after diode D1, D2, D3 and D4 rectification.The V of the first inversion submodule 510 exports V1 mutually and exports U2 mutually with the U of the second inversion submodule 520 and be connected in series each other, and these two inversion submodule modulating waves are identical, but its carrier wave differs 180 °.Like this, the output voltage size of two inversion submodules is identical up and down, but because carrier phase differs certain angle, when the output voltage of these two inversion submodules superposes, just can produce the PWM waveform of being made up of two steps (for example shown in Figure 6).Like this, the inverter voltage level number increases and the inverter voltage total value is constant, and it is original 1/2nd that dv/dt drops to, thereby harmonic content is reduced.
By top description as can be seen, the DC power supply that present embodiment provides is with respect to the main feature of prior art: one, and the DC power supply in the present embodiment has adopted closed-loop control system; Its two, the inversion unit in the present embodiment is connected mutually by a plurality of inversion submodules and is formed.The structure and the operation principle of other parts of the DC power supply that provides as for present embodiment, similar with appropriate section among aforementioned first embodiment, do not repeat them here.
This shows, DC power supply in the present embodiment is the structure that a plurality of inversion submodules are connected mutually because of its inversion unit employing, and this DC power supply also comprises the dsp processor with high speed processing ability, so the direct voltage of this DC power supply output has the few and low characteristics of ripple of harmonic wave simultaneously.And this DC power supply has adopted the voltage close loop control system based on high-speed dsp control, all can regulate the output of this DC power supply in real time, apace corresponding to different load currents like this, thereby provides high-precision direct voltage to supply with to load.In addition, because the control of the DC power supply in the present embodiment is the duty ratio of PWM ripple, and what control unlike linear power supply of the prior art is the angle of flow of adjusting pipe, therefore, this control mode of the present invention can not produce power loss on the adjustment pipe as linear power supply of the prior art.Because the DC power supply in the present embodiment has adopted above-mentioned technological means, therefore this DC power supply not only has the characteristics of few, the low ripple of harmonic wave, but also have characteristics such as low in energy consumption, high accuracy, Adjustable real-time, simultaneously, adopt this DC power supply can also avoid damaging the precision instrument even load.
It is to be noted, although the inversion unit in the previous embodiment comprises two inversion submodules of series connection mutually, yet be understandable that, in actual applications, inversion unit also can be in series by three inversion submodules, correspondingly, equivalent capacitance also with regard to three of needs carrying out dividing potential drop, and the carrier wave of three inversion submodules differs 120 °.In like manner, inversion unit also can be in series by four inversion submodules, correspondingly, equivalent capacitance also just needs four, and the carrier wave of four inversion submodules differs 90 ° ..., by that analogy, inversion unit can be in series by the individual inversion submodule of n (n is more than or equal to 2), and correspondingly, equivalent capacitance also just needs n, and the carrier wave of n inversion submodule differs 360 °/n, like this, dv/dt just drops to original 1/n, thereby harmonic content is significantly reduced.
In addition, in order to be illustrated more clearly in inversion unit before adopting many level phase shift PWM technology and effect afterwards, see also Fig. 3 and Fig. 6.
Wherein, Fig. 3 is the PWM waveform schematic diagram of the inverter voltage of Switching Power Supply in the prior art, and particularly, the waveform of its phase voltage is the PWM waveform that has only 2 level, and its dv/dt is bigger.
The PWM waveform schematic diagram of the inverter voltage of a kind of DC power supply that Fig. 6 provides for second embodiment of the invention, wherein inversion unit has adopted the mode that two-stage inversion submodule is connected mutually, its waveform just becomes the PWM waveform with 4 level like this, and its dv/dt reduces with respect to prior art.
Be understandable that above execution mode only is the illustrative embodiments that adopts for principle of the present invention is described, yet the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement also are considered as protection scope of the present invention.
Claims (10)
1. a DC power supply comprises input rectifying unit, inversion unit and output rectification unit, and wherein, described input rectifying unit is used for the alternating current from electrical network is carried out rectification, being converted into direct current, and described direct current is transferred to inversion unit; Described inversion unit is used for described direct current is carried out inverse transformation, being converted into alternating current, and described alternating current is transferred to the output rectification unit; Described output rectification unit is used for the alternating current from described inversion unit is carried out rectification, and to be converted into direct current and to export to load, it is characterized in that: described DC power supply also comprises detecting unit and dsp processor, wherein
Described detecting unit is arranged on the downstream of described output rectification unit, detects in order to the voltage that the output filter unit is transferred to load, and detected value is transferred to dsp processor;
Described dsp processor is arranged between described detecting unit and the inversion unit, in order to export corresponding PWM to described inversion unit according to the load voltage desired value of the detected value of described load voltage and input in advance, break-make with switching device in the control inversion unit, adjust its duty ratio, and then adjust the output voltage of inversion unit, so that the detected value of load voltage levels off to the desired value of load voltage.
2. DC power supply according to claim 1, it is characterized in that, described DC power supply also comprises the output filter unit, it is arranged on the downstream of described output rectification unit, in order to the direct current from described output rectification unit is carried out filtering, and export filtered direct current to load and described detecting unit.
3. DC power supply according to claim 2 is characterized in that, described output filter unit comprises the LC filter.
4. DC power supply according to claim 1 is characterized in that, described dsp processor adopts the TMS320LF2407 of TI company or the processor of TMS320F240 or TMS320C2812 model.
5. according to any described DC power supply in the claim 1 to 4, it is characterized in that, described inversion unit comprises n the inversion submodule of series connection mutually, the intercarrier of described n the inversion submodule electrical degree of 360 °/n that staggers mutually, thus the level number of inverter voltage is increased and its total voltage value is constant, with the dv/dt value of the pulse-width modulation waveform that reduces inverter voltage, and then the harmonic content in the minimizing inverter voltage, improve the quality of output voltage, wherein, n is the integer more than or equal to 2.
6. DC power supply according to claim 5, it is characterized in that the quantity of described inversion submodule is 2, the modulating wave of described 2 inversion submodules is identical, and carrier wave differs 180 °, and the level number of inverter voltage increases to 4 and its total voltage value remains unchanged.
7. DC power supply according to claim 6 is characterized in that, switching element T 1 and T3 in the first inversion submodule connect mutually, and switching element T 2 and T4 connect mutually; Switching element T 5 and T7 in the second inversion submodule connect mutually, switching element T 6 and T8 connect mutually, and link to each other with serial connection point between switching element T 5 and the T7 by the serial connection point between switching element T 2 and the T4 and to realize that the described first inversion submodule and the second inversion submodule connect mutually; Serial connection point between switching element T 1 and the T3 is exported mutually as the U of described inversion unit, and the serial connection point between switching element T 6 and the T8 is exported mutually as the V of described inversion unit.
8. DC power supply according to claim 7 is characterized in that described switching device comprises triode, field effect transistor, thyristor.
9. DC power supply according to claim 5, it is characterized in that, the upstream of described inversion unit also comprises the bleeder circuit of being made up of several division module, the quantity of described division module is corresponding with the quantity of inversion submodule, and the voltage that each division module is obtained offers corresponding inversion submodule.
10. DC power supply according to claim 9 is characterized in that, described division module comprises electric capacity or electric resistance partial pressure device.
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| CN200810101326A CN101527514A (en) | 2008-03-04 | 2008-03-04 | Direct current power supply |
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| CN200810101326A CN101527514A (en) | 2008-03-04 | 2008-03-04 | Direct current power supply |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101728957B (en) * | 2009-11-24 | 2011-09-28 | 华东交通大学 | Method for reducing no-load loss of inverter with two-stage structure |
| CN103008804A (en) * | 2012-12-12 | 2013-04-03 | 上海新维机电工程技术有限公司 | Direct-current power supply device for electrical cutting |
| CN103629095A (en) * | 2012-08-24 | 2014-03-12 | 岳勇斌 | Small-sized diaphragm pump simulation frequency changing system and control method thereof |
| CN103797699A (en) * | 2011-07-01 | 2014-05-14 | 利纳克有限公司 | Power supply with output rectifier |
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2008
- 2008-03-04 CN CN200810101326A patent/CN101527514A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101728957B (en) * | 2009-11-24 | 2011-09-28 | 华东交通大学 | Method for reducing no-load loss of inverter with two-stage structure |
| CN103797699A (en) * | 2011-07-01 | 2014-05-14 | 利纳克有限公司 | Power supply with output rectifier |
| CN103629095A (en) * | 2012-08-24 | 2014-03-12 | 岳勇斌 | Small-sized diaphragm pump simulation frequency changing system and control method thereof |
| CN103629095B (en) * | 2012-08-24 | 2016-08-17 | 岳勇斌 | Microdiaphragm pump simulated frequency conversion system and control method thereof |
| CN103008804A (en) * | 2012-12-12 | 2013-04-03 | 上海新维机电工程技术有限公司 | Direct-current power supply device for electrical cutting |
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