CN103001524A - Single-phase inverter - Google Patents
Single-phase inverter Download PDFInfo
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- CN103001524A CN103001524A CN2011102671844A CN201110267184A CN103001524A CN 103001524 A CN103001524 A CN 103001524A CN 2011102671844 A CN2011102671844 A CN 2011102671844A CN 201110267184 A CN201110267184 A CN 201110267184A CN 103001524 A CN103001524 A CN 103001524A
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- switching device
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Abstract
The invention discloses a double-BUCK single-phase inverter which is used for converting direct current output by a direct current power supply into alternating current. The single-phase inverter comprises an energy storage circuit, a first BUCK circuit and a second BUCK circuit and a full bridge inverter circuit, wherein the energy storage circuit is connected to two ends of the direct current power supply and used for filtering high frequency component in voltage output by the direct current power supply; the first BUCK circuit and the second BUCK circuit are connected in series and then parallelly connected to two ends of the direct current power supply, the first BUCK circuit is connected with the positive end of the direct current power supply, the second BUCK circuit and is connected with the negative end of the direct current power supply, and the first BUCK circuit and the second BUCK circuit are used for converting direct-current voltage output by the direct current power supply into lower direct-current voltage and outputting the lower direct-current voltage. The full bridge inverter circuit is used for converting the lower direct-current voltage output by the first BUCK circuit and the second BUCK circuit into alternating-current voltage. The inverter can effectively suppress common mode current leakage and improve energy conversion efficiency.
Description
Technical field
The present invention relates to the voltage transitions technical field, be specifically related to a kind of single-phase inverter.
Background technology
At present in the device of converting direct-current voltage into alternating-current voltage, in order to improve as far as possible conversion efficiency, exchanging the scheme that can adopt transless to be incorporated into the power networks of holding, thereupon needing problems of concern is the over the ground existence of parasitic capacitance and the interference of the common mode leakage current that brings of DC power supply (for example solar panel), namely, time variant voltage acted on the parasitic capacitance when action of switching device may produce high frequency, and then caused leakage current generating also may go beyond the scope.High-frequency leakage current can reduce system effectiveness, and the infringement output quality of power supply increases system's electromagnetic interference, and the person is threatened, and forms potential safety hazard, and easily causes the protective device of leakage current escape, affects the reliability of whole system.
The device of converting direct-current voltage into alternating-current voltage adopts full bridge inverter usually, and the converting direct-current voltage into alternating-current voltage that DC power supply is exported offers load.In order to improve as far as possible conversion efficiency, can adopt transformerless scheme at the interchange end, if conventional full bridge inverter adopts bipolar modulated, can obtain stable common-mode voltage, the common mode leakage current is less, but conversion efficiency is poor, inductive current pulsation is large, needs to adopt larger filter inductance; If adopt the one pole modulation, then the differential mode characteristic good receives publicity as the input direct voltage utilance is high, the filter inductance current pulsation is little and efficient is high, but produces simultaneously the common-mode voltage of switching frequency pulsation, and then produces the common mode leakage current.
Can address the above problem to a certain extent although increase the leakage current absorption plant, can bring again problems such as increasing cost, reduction energy conversion efficiency.
Summary of the invention
The embodiment of the invention provides a kind of single-phase inverter for the problem that above-mentioned prior art exists, with common-mode voltage, inhibition common mode leakage current, reduction electromagnetic interference, the energy conversion efficiency that improves of avoiding producing the switching frequency pulsation.
For this reason, the embodiment of the invention provides following technical scheme:
A kind of single-phase inverter is used for the converting direct-current power into alternating-current power with DC power supply output, comprising:
Accumulator is connected to described DC power supply two ends, is used for the high fdrequency component of the described DC power output voltage of filtering;
The one BUCK circuit and the 2nd BUCK circuit, after being connected in series, a described BUCK circuit and the 2nd BUCK circuit be connected in parallel on the two ends of described DC power supply, a described BUCK circuit links to each other with the anode of described DC power supply, described the 2nd BUCK circuit links to each other with the negative terminal of described DC power supply, and a described BUCK circuit and the 2nd BUCK circuit are used for the direct voltage of described DC power supply output is converted to lower direct voltage and output;
Full bridge inverter links to each other with the 2nd BUCK circuit with a described BUCK circuit respectively, is used for the direct voltage of a described BUCK circuit and the output of the 2nd BUCK circuit is converted to alternating voltage.
Preferably, described accumulator comprises:
The first electric capacity that is connected in series and the second electric capacity, the junction of described the first electric capacity and the second electric capacity form midpoint potential and output;
Being connected in series a little of a described BUCK circuit and described the 2nd BUCK circuit links to each other with described midpoint potential.
Preferably, a described BUCK circuit comprises: the 5th switching device, and the first diode and the first inductance, wherein, the first end of the 5th switching device connects the anode of described DC power supply, and an end of the first inductance is connected to described full bridge inverter; Described the 2nd BUCK circuit comprises: the 6th switching device, and the second diode and the second inductance, wherein, the first end of the 6th switching device connects the negative terminal of described DC power supply, and an end of the second inductance is connected to described full bridge inverter; The anode of the first diode links to each other with the negative electrode of the second diode, is used for obtaining the midpoint potential of described accumulator output.
Preferably, described full bridge inverter comprises: four switching devices, wherein:
The first end of the first end of the first switching device and second switch device is connected to a described BUCK circuit together;
The second end of the 3rd switching device and the second end of the 4th switching device are connected to described the 2nd BUCK circuit together;
The second end of the first switching device links to each other with the first end of the 3rd switching device as an output of described single-phase inverter, and the second end of second switch device links to each other as another output of described single-phase inverter with the first end of the 4th switching device.
Preferably, the front half period within a work period, the 5th switching device and the 6th switching device be with synchronous high-frequency pulse signal trigger action, the first switching device and the 4th switching device conducting, and second switch device and the 3rd switching device turn-off; In the later half cycle within a work period, the 5th switching device and the 6th switching device are with synchronous high-frequency pulse signal trigger action, and the first switching device and the 4th switching device turn-off, second switch device and the 3rd switching device conducting.
Preferably, described high-frequency pulse signal is pwm pulse signal.
Preferably, described high-frequency pulse signal is the pulse signal in the KHz scope.
Preferably, described single-phase inverter also comprises:
Filter element is connected between the output of the output of a described BUCK circuit and described the 2nd BUCK circuit, is used for the high fdrequency component of the direct voltage of the described BUCK circuit of filtering and the 2nd BUCK circuit output.
Preferably, described filter element is electric capacity.
The single-phase inverter that the embodiment of the invention provides, by the clamp circuit in continuous current circuit, can establishment common mode leakage current, improve energy conversion efficiency.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use among the embodiment, apparently, the accompanying drawing that the following describes only is some embodiment that put down in writing among the present invention, for those of ordinary skills, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the theory diagram of embodiment of the invention single-phase inverter;
Fig. 2 is a kind of physical circuit figure of embodiment of the invention single-phase inverter;
Fig. 3 is the driving signal of each switching device in the embodiment of the invention inverter course of work and the voltage signal schematic diagram on the filter capacitor;
Fig. 4 is the current circuit schematic diagram of embodiment of the invention inverter when load voltage positive half period pwm pulse triggering and conducting;
Fig. 5 is the current circuit schematic diagram of embodiment of the invention inverter when load voltage positive half period pwm pulse turn-offs;
Fig. 6 is the current circuit schematic diagram of embodiment of the invention inverter when load voltage negative half-cycle pwm pulse triggering and conducting;
Fig. 7 is the current circuit schematic diagram of embodiment of the invention inverter when load voltage negative half-cycle pwm pulse turn-offs.
Embodiment
In order to make those skilled in the art person understand better the scheme of the embodiment of the invention, below in conjunction with drawings and embodiments the embodiment of the invention is described in further detail.
As shown in Figure 1, be a kind of circuit diagram of embodiment of the invention single-phase inverter.
This inverter is used for the converting direct-current power into alternating-current power with DC power supply 101 outputs, offers AC load 102.This inverter comprises:
Accumulator 11 is connected to DC power supply 101 two ends, is used for the high fdrequency component of filtering DC power supply 101 output voltages;
The one BUCK circuit 12 and the 2nd BUCK circuit 13, be connected in parallel on the two ends of DC power supply 101 after being connected in series, the one BUCK circuit 12 links to each other with the anode of DC power supply 101, the 2nd BUCK circuit 13 links to each other with the negative terminal of DC power supply 101, and a BUCK circuit 12 and the 2nd BUCK circuit 13 are used for the direct voltage of DC power supply 101 outputs is converted to lower direct voltage and output;
Being connected in series a little of an above-mentioned BUCK circuit 12 and the 2nd BUCK circuit 13 links to each other with the midpoint potential of accumulator 11 outputs.
Full bridge inverter 14 links to each other with the 2nd BUCK circuit 13 with a BUCK circuit 12 respectively, is used for the direct voltage of a BUCK circuit 12 and 13 outputs of the 2nd BUCK circuit is converted to alternating voltage, offers AC load 102.
In this embodiment, also can further comprise: filter element (not shown), be connected between the output of the output of a described BUCK circuit 12 and described the 2nd BUCK circuit 13, be used for the high fdrequency component of the direct voltage of the described BUCK circuit 12 of filtering and 13 outputs of the 2nd BUCK circuit.In concrete the application, described filter element can be electric capacity.
As shown in Figure 2, be a kind of physical circuit figure of embodiment of the invention single-phase inverter.
In this embodiment, the first capacitor C 1 that is connected in series and the second capacitor C 2 consist of above-mentioned accumulator, one end of the first capacitor C 1 connects the anode of DC power supply PV, the other end links to each other with the second capacitor C 2, one end of the second capacitor C 2 connects the negative terminal of DC power supply PV, the other end links to each other with the first capacitor C 1, and the junction of the first capacitor C 1 and the second capacitor C 2 forms above-mentioned midpoint potential and output.
The 5th switching device S5, the first diode D1 and the first inductance L 1 consist of an above-mentioned BUCK circuit, the 6th switching device S6, the second diode D2 and the second inductance L 2 consist of above-mentioned the 2nd BUCK circuit.
The first switching device S1, second switch device S2, the 3rd switching device S3 and the 4th switching device S4 consist of above-mentioned full bridge inverter.
In this embodiment, each switching device has respectively a first end and one second end.Wherein:
The 5th switching device S5, the first diode D1, the second diode D2, the 6th switching device S6 are connected in series successively, and the negative electrode of anodic bonding the second diode D2 of the first diode D1.The first end of the 5th switching device S5 connects the anode of DC power supply PV; The first end of the 6th switching device S6 connects the negative terminal of DC power supply PV.
One end of the first inductance L 1 connects respectively the negative electrode of the first diode D1 and the second end of the 5th switching device S5, and the other end of the first inductance L 1 connects respectively the first end of the first switching device S1 and the first end of second switch device S2; One end of the second inductance L 2 connects respectively the anode of the second diode D2 and the second end of the 6th switching device S6, and the other end of the second inductance L 2 connects respectively the second end of the 3rd switching device S3 and the second end of the 4th switching device S4.
The second end of the first switching device S1 links to each other with the first end of the 3rd switching device S3, and the output of end as described inverter should link to each other, the second end of second switch device S2 links to each other with the first end of the 4th switching device S4, and end another output as described inverter that should link to each other.
In this embodiment, the first capacitor C 1 and the second capacitor C 2 can adopt the electric capacity of symmetrical configuration, and electric property is identical, is attempted by the two ends of DC power supply PV after the series connection, play the effect that absorbs voltage ripple and energy storage in the dc bus; The midpoint potential that the junction of C1 and C2 forms DC power supply voltage plays the effect of voltage clamp, and establishment common mode leakage current improves energy conversion efficiency.
In addition, in this embodiment, also can further comprise: filter capacitor C3, its two ends link to each other with the other end of described the first inductance L 1 and the other end of described the second inductance L 2 respectively.Because the existence of the first capacitor C 1 and the second capacitor C 2, filter capacitor C3 can choose the less electric capacity of appearance value, thin-film capacitor for example, and the life-span is long, has increased reliability and the life-span of inverter.
Voltage V after filter capacitor C3 filtering
C3Waveform see Fig. 3, can find out V
C3Be sinusoidal positive half wave, contain hardly high fdrequency component.
Above-mentioned the first switching device S1 to the six switching device S6 can be MOSFET, and correspondingly, the first end of above-mentioned switching device refers to the D utmost point of MOSFET, and the second end refers to the S utmost point of MOSFET.
Above-mentioned the first switching device S1 to the six switching device S6 can also be the IGBT of diode in the belt body not, and correspondingly, the first end of above-mentioned switching device refers to the collector electrode of IGBT, and the second end refers to the emitter of IGBT.
In actual applications, the 5th switching device S5 and the 6th switching device S6 be MOSFET preferably, and the first switching device S1 to the four switching device S4 are IGBT preferably.
Above-mentioned DC power supply PV can be a generator, such as solar generator.
A work period of above-mentioned inverter was comprised of front half period and later half cycle, and the corresponding course of work of inverter within a work period is divided into two stages, was respectively the working stage that load voltage is the working stage of timing and load voltage when negative.
In the work period, a kind of drive signal waveform of each switching tube of inverter as shown in Figure 3, wherein, V
AcVoltage signal in the expression load.
(T represents a switch periods at phase I 0～T/2, it is the load voltage signal cycle), be the working stage of timing corresponding to load voltage, the 5th switching device S5 and the 6th switching device S6 are with synchronous high-frequency pulse signal trigger action, the first switching device S1 and the 4th switching device S4 conducting, second switch device S2 and the 3rd switching device S3 turn-off.
At second stage T/2～T, working stage when being negative corresponding to load voltage, the 5th switching device S5 and the 6th switching device S6 are with synchronous high-frequency pulse signal trigger action, and the first switching device S1 and the 4th switching device S4 turn-off, second switch device S2 and the 3rd switching device S3 conducting.
Above-mentioned high-frequency pulse signal is pwm pulse signal, such as being pulse signal in the KHz scope.
The single-phase inverter of the embodiment of the invention, the structure of the two BUCK circuit+inverter circuits of employing.As shown in Figure 3, only have switching device S5 and S6 in the BUCK circuit to adopt high frequency to trigger in six switching devices, reduced switching loss, further improved efficient, and this symmetrical structure can reduce leakage current effectively.In addition, because the triggering signal of switching device S5 and S6 is identical, bear separately the voltage of half in the course of work, therefore, switching device S5 and S6 can select the lower switching device of electric pressure.
The below is elaborated further combined with the operation principle of driving signal shown in Figure 3 to the two BUCK single-phase inverters of the embodiment of the invention shown in Figure 2.
For convenience, the below defines first following parameter:
V
PVBe the output voltage of DC power supply, V
AOBe the voltage that A point and O among the figure are ordered, V
BOBe the voltage that B point and O among the figure are ordered, V
CMBe common-mode voltage, i
CMBe common mode leakage current, C
CMBe DC power supply PV over the ground the appearance value of parasitic capacitance, i.e. common mode capacitance appearance value.
At phase I 0～T/2, be the working stage of timing corresponding to load voltage, the 5th switching device S5 and the 6th switching device S6 be with synchronous high-frequency pulse signal trigger action, the first switching device S1 and the 4th switching device S4 conducting, and second switch device S2 and the 3rd switching device S3 turn-off.
When the 5th switching device S5, the 6th switching device S6 conducting, the first diode D1 and the second diode D2 bear reverse voltage, are in blocking state, and its current circuit is: PV+ → S5 → L1 → S1 → AC load → S4 → L2 → S6 → PV-, as shown in Figure 4.
At this moment, V
AO=V
PV, V
BO=0, the common-mode voltage of inverter is:
V
CM＝(V
AO+V
BO)/2＝(V
PV+0)/2＝V
PV/2 (1)
When the 5th switching device S5, the 6th switching device S6 turn-off, because the electric current in the first inductance L 1 and the second inductance L 2 can not suddenly change, therefore, the both end voltage of the first diode D1 and the second diode D2 is reverse, the first diode D1 and the second diode D2 transfer opening state to by blocking state, formed continuous current circuit, its current circuit is: L1 → S1 → AC load → S4 → L2 → D2 → D1 → L1, as shown in Figure 5.
At this moment, V
AO=V
PV/ 2, V
BO=V
PV/ 2, the common-mode voltage of inverter is:
V
CM＝(V
AO+V
BO)/2＝(V
PV/2+V
PV/2)/2＝V
PV/2 (2)
As seen, inverter is in the above-mentioned phase I, and common-mode voltage remains unchanged, and is V
PV/ 2.
At second stage T/2～T, working stage when being negative corresponding to load voltage, the 5th switching device S5 and the 6th switching device S6 are with synchronous high-frequency pulse signal trigger action, and the first switching device S1 and the 4th switching device S4 turn-off, second switch device S2 and the 3rd switching device S3 conducting.
When the 5th switching device S5, the 6th switching device S6 conducting, the first diode D1 and the second diode D2 bear reverse voltage, are in blocking state, and its current circuit is: PV+ → S5 → L1 → S2 → AC load → S3 → L2 → S6 → PV-, as shown in Figure 6.
At this moment, V
AO=V
PV, V
BO=0, common-mode voltage is:
V
CM＝(V
AO+V
BO)/2＝(V
PV+0)/2＝V
PV/2； (3)
When the 5th switching device S5, the 6th switching device S6 turn-off, because the electric current in the first inductance L 1 and the second inductance L 2 can not suddenly change, therefore, the both end voltage of the first diode D1 and the second diode D2 is reverse, the first diode D1 and the second diode D2 transfer opening state to by blocking state, formed continuous current circuit, its current circuit is: L1 → S2 → AC load → S3 → L2 → D2 → D1 → L1, as shown in Figure 7.
At this moment, V
AO=V
PV/ 2, V
BO=V
PV/ 2, common-mode voltage is:
V
CM＝(V
AO+V
BO)/2＝(V
PV/2+V
PV/2)/2＝V
PV/2 (4)
As seen, inverter is in above-mentioned second stage, and common-mode voltage remains unchanged, and is V
PV/ 2.
Can find out common-mode voltage V by above-mentioned analysis to the inverter course of work
CMAll the time invariable in the whole course of work, by common-mode voltage V
CMMode ship current i together
CMBetween relation (i
CM=C
CMDV
CM/ dt) as can be known, common mode leakage current i
CMBe always zero.
Two BUCK single-phase inverters of the embodiment of the invention, continuous current circuit and DC side disconnect fully, thereby establishment common mode current, improved the operating efficiency of inverter.
More than the embodiment of the invention is described in detail, used embodiment herein the present invention set forth, the explanation of above embodiment just is used for helping to understand equipment of the present invention; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. a single-phase inverter is used for the converting direct-current power into alternating-current power with DC power supply output, it is characterized in that, comprising:
Accumulator is connected to described DC power supply two ends, is used for the high fdrequency component of the described DC power output voltage of filtering;
The one BUCK circuit and the 2nd BUCK circuit, after being connected in series, a described BUCK circuit and the 2nd BUCK circuit be connected in parallel on the two ends of described DC power supply, a described BUCK circuit links to each other with the anode of described DC power supply, described the 2nd BUCK circuit links to each other with the negative terminal of described DC power supply, and a described BUCK circuit and the 2nd BUCK circuit are used for the direct voltage of described DC power supply output is converted to lower direct voltage and output;
Full bridge inverter links to each other with the 2nd BUCK circuit with a described BUCK circuit respectively, is used for the direct voltage of a described BUCK circuit and the output of the 2nd BUCK circuit is converted to alternating voltage.
2. single-phase inverter according to claim 1 is characterized in that, described accumulator comprises:
The first electric capacity that is connected in series and the second electric capacity, the junction of described the first electric capacity and the second electric capacity form midpoint potential and output;
Being connected in series a little of a described BUCK circuit and described the 2nd BUCK circuit links to each other with described midpoint potential.
3. single-phase inverter according to claim 2 is characterized in that,
A described BUCK circuit comprises: the 5th switching device, and the first diode and the first inductance, wherein, the first end of the 5th switching device connects the anode of described DC power supply, and an end of the first inductance is connected to described full bridge inverter;
Described the 2nd BUCK circuit comprises: the 6th switching device, and the second diode and the second inductance, wherein, the first end of the 6th switching device connects the negative terminal of described DC power supply, and an end of the second inductance is connected to described full bridge inverter;
The anode of the first diode links to each other with the negative electrode of the second diode, is used for obtaining the midpoint potential of described accumulator output.
4. single-phase inverter according to claim 3 is characterized in that, described full bridge inverter comprises: four switching devices, wherein:
The first end of the first end of the first switching device and second switch device is connected to a described BUCK circuit together;
The second end of the 3rd switching device and the second end of the 4th switching device are connected to described the 2nd BUCK circuit together;
The second end of the first switching device links to each other with the first end of the 3rd switching device as an output of described single-phase inverter, and the second end of second switch device links to each other as another output of described single-phase inverter with the first end of the 4th switching device.
5. single-phase inverter according to claim 4, it is characterized in that, the front half period within a work period, the 5th switching device and the 6th switching device are with synchronous high-frequency pulse signal trigger action, the first switching device and the 4th switching device conducting, second switch device and the 3rd switching device turn-off; In the later half cycle within a work period, the 5th switching device and the 6th switching device are with synchronous high-frequency pulse signal trigger action, and the first switching device and the 4th switching device turn-off, second switch device and the 3rd switching device conducting.
6. single-phase inverter according to claim 5 is characterized in that, described high-frequency pulse signal is pwm pulse signal.
7. single-phase inverter according to claim 5 is characterized in that, described high-frequency pulse signal is the pulse signal in the KHz scope.
8. according to claim 1 to 7 each described single-phase inverters, it is characterized in that described single-phase inverter also comprises:
Filter element is connected between the output of the output of a described BUCK circuit and described the 2nd BUCK circuit, is used for the high fdrequency component of the direct voltage of the described BUCK circuit of filtering and the 2nd BUCK circuit output.
9. single-phase inverter according to claim 8 is characterized in that, described filter element is electric capacity.
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|---|---|---|---|
| CN2011102671844A CN103001524A (en) | 2011-09-09 | 2011-09-09 | Single-phase inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102671844A CN103001524A (en) | 2011-09-09 | 2011-09-09 | Single-phase inverter |
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| CN2011102671844A Pending CN103001524A (en) | 2011-09-09 | 2011-09-09 | Single-phase inverter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475233A (en) * | 2013-08-20 | 2013-12-25 | 国家电网公司 | Switching power supply with high electric-energy conversion efficiency |
| CN108988656A (en) * | 2017-05-31 | 2018-12-11 | 南京聚鲲物联网科技有限公司 | A kind of broad stopband high-frequency high-power density inverse method and its system |
| CN114337305A (en) * | 2021-12-31 | 2022-04-12 | 苏州汇川控制技术有限公司 | DC voltage conversion circuit and device |
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| US6104624A (en) * | 1999-03-15 | 2000-08-15 | Mitsubishi Denki Kabushiki Kaisha | System connecting device |
| CH698917B1 (en) * | 2006-12-23 | 2009-12-15 | Dirk Schekulin | Transformerless inverter circuit arrangement, particularly for grid connection of photovoltaic generator or fuel cell system, has synchronized and controlled commutator circuit connected on output side of direct current control circuit |
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2011
- 2011-09-09 CN CN2011102671844A patent/CN103001524A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6104624A (en) * | 1999-03-15 | 2000-08-15 | Mitsubishi Denki Kabushiki Kaisha | System connecting device |
| CH698917B1 (en) * | 2006-12-23 | 2009-12-15 | Dirk Schekulin | Transformerless inverter circuit arrangement, particularly for grid connection of photovoltaic generator or fuel cell system, has synchronized and controlled commutator circuit connected on output side of direct current control circuit |
Non-Patent Citations (1)
| Title |
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| ROBERTO GONZÁLEZ，ETC.: ""Transformerless Inverter for Single-Phase Photovoltaic Systems"", 《IEEE TRANSACTIONS ON POWER ELECTRONICS》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475233A (en) * | 2013-08-20 | 2013-12-25 | 国家电网公司 | Switching power supply with high electric-energy conversion efficiency |
| CN103475233B (en) * | 2013-08-20 | 2017-01-18 | 国家电网公司 | Switching power supply with high electric-energy conversion efficiency |
| CN108988656A (en) * | 2017-05-31 | 2018-12-11 | 南京聚鲲物联网科技有限公司 | A kind of broad stopband high-frequency high-power density inverse method and its system |
| CN114337305A (en) * | 2021-12-31 | 2022-04-12 | 苏州汇川控制技术有限公司 | DC voltage conversion circuit and device |
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Application publication date: 20130327 |