CN203951366U - A kind of power supply for power information acquisition terminal - Google Patents

A kind of power supply for power information acquisition terminal Download PDF

Info

Publication number
CN203951366U
CN203951366U CN201420286877.7U CN201420286877U CN203951366U CN 203951366 U CN203951366 U CN 203951366U CN 201420286877 U CN201420286877 U CN 201420286877U CN 203951366 U CN203951366 U CN 203951366U
Authority
CN
China
Prior art keywords
circuit
power
information acquisition
winding
power factor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201420286877.7U
Other languages
Chinese (zh)
Inventor
纪峰
周超
鲍进
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, State Grid Jiangsu Electric Power Co Ltd, Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201420286877.7U priority Critical patent/CN203951366U/en
Application granted granted Critical
Publication of CN203951366U publication Critical patent/CN203951366U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/10Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Abstract

The utility model discloses a kind of power supply for power information acquisition terminal, divide and adopt two stage power factor correcting technology at power input part, the first order is active power factor correction and rectifying and wave-filtering part, and the second level is pulse-width modulation flyback output.First order rectifying and wave-filtering has used high voltage thin film electric capacity to replace the scheme of high-voltage electrolytic capacitor, and second level pulsewidth debugging flyback part adopts quasi-resonance technology.The utility model adopts active power factor correction technology, increases substantially terminal power factor, reduces reactive loss, has improved utilization rate of electrical, meanwhile, reduces rectifying part and produces the interference of harmonic wave to whole electrical network.

Description

A kind of power supply for power information acquisition terminal
Technical field
The utility model relates to a kind of power supply for power information acquisition terminal, belongs to power information collecting device field.
Background technology
A critical function of power information collecting device is exactly that electric weight and power to electric energy meter measures incessantly, again by metering result by being uploaded to power supply department control room as the communication modes such as carrier wave, GPRS, power supply department is again according to electricity consumption situation reasonable distribution electric power resource.This just needs power information collecting device to work incessantly.Conventionally power information acquisition terminal plant capacity factor is only less than 0.4, means that the electric energy that power plant sends 10 units has the energy loss of 6 units to fall.And electric information acquisition terminal needs long-term continual operation, this certainly will cause valuable power resource greatly to waste.
Power grid environment noise can affect common quality conventionally, if power carrier communication mode is to couple a signal in power line, by power line by signal transmission.Acquisition terminal generally provides electric energy by power supply, when common power rectifying and wave-filtering, can produce humorous wave interference, and these interference signals can be added on normal communication signal, affects the success rate of terminal called.
Power information acquisition terminal adopts three-phase four-wire system input mode conventionally, when specified input voltage, and the about 540V of direct voltage after rectification, when maximum input voltage, after rectification, direct current reaches 700V.Incoming frequency 50Hz, this just need to adopt the high withstand voltage capacitor of large capacity, and way is to adopt two electrochemical capacitor series systems to meet high withstand voltage large capacity requirement conventionally.The volume dependent of electrochemical capacitor is in how much electrolytical, and electrolyte can gradually reduce with increasing service time, and electrochemical capacitor capacity gradually reduces, until final electrochemical capacitor lost efficacy.Power information acquisition terminal designed life conventionally need to be higher than 10 years, and high-voltage electrolytic capacitor normally affects one of bottleneck of terminal bulk life time.
The plurality of advantages such as Switching Power Supply has volume little, and efficiency is high, and cost is low, so power information acquisition terminal adopts Switching Power Supply mode to power conventionally, adopt flyback topological structure conventionally.Flyback topological structure is in metal-oxide-semiconductor conducting moment, due to transformer primary side inductance and metal-oxide-semiconductor equivalence output junction capacitance resonance formation switching noise, it is electromagnetic interference, electromagnetic interference can conduct in electrical network along with power line, also can radiate with the form of radiation impact electronic product and power grid quality around.
Utility model content
The utility model provides a kind of power supply for power information acquisition terminal, and its object is that power information collection improves the power factor of terminal, and harmonic reduction disturbs, and improves the electrical network quality of power supply.
For achieving the above object, the technical scheme that the utility model adopts is as follows:
For a power supply for power information acquisition terminal, comprise primary-side circuitry and secondary-side circuitry, described primary-side circuitry comprises the rectified three-phase circuit, circuit of power factor correction, filter circuit and the quasi-resonance circuit of reversed excitation that connect successively; Described secondary-side circuitry comprises output circuit.
Aforesaid rectified three-phase circuit forms three-phase bridge full-wave rectifying circuit by rectifier diode.
Aforesaid circuit of power factor correction is by power factor correction controller U1, PFC switch MOS pipe Q1, PFC boost inductance L1 forms, the grid series winding of the driving pin of described power factor correction controller U1 and described PFC switch MOS pipe Q1, the drain electrode series winding of described PFC boost inductance L1 and described PFC switch MOS pipe Q1, described PFC boost inductance L1 and rectified three-phase circuit are in series, and described PFC switch MOS pipe Q1 and rectified three-phase circuit are in parallel.
Aforesaid power factor correction controller U1 is also connected with input voltage sample circuit and input current sample circuit, an input of described input voltage sample circuit access power factor correcting controller U1 comparator, adopts the electric resistance partial pressure mode input voltage of sampling; Another input of described input current sample circuit access power factor correcting controller U1 comparator, together with employing sampling coil is closely wound on PFC boost inductance L1, the current waveform on sampling PFC boost inductance L1.
Aforesaid filter circuit comprises PFC rectifier diode D1 and filter capacitor C1, and described PFC rectifier diode D1 and rectified three-phase circuit are in series, and described filter capacitor C1 and rectified three-phase circuit are in parallel.
Aforesaid filter capacitor C1 is high voltage thin film electric capacity.
Aforesaid quasi-resonance circuit of reversed excitation comprises quasi-resonance controller U2, switch MOS pipe Q2, transformer T1 and feedback network; Described transformer T1 comprises primary side winding and primary side winding; The driving pin of described quasi-resonance controller U2 connects the grid of described switch MOS pipe Q2, and the drain electrode of described switch MOS pipe Q2 connects the first side winding of described transformer T1, and described primary side winding connects main road output circuit; The primary side winding of described transformer T1 connects bypass output circuit; The signal of described feedback network sampling main road output circuit, feeds back to 2 pin of described quasi-resonance controller U2.
Aforesaid quasi-resonance controller U2 is also connected with the lowest point testing circuit, and described the lowest point testing circuit connects the ZCD pin of a resistance to power factor correction controller U1 by auxiliary winding.
Aforesaid output circuit comprises main road output and bypass output, and described main road output and bypass output are by primary side winding and the primary side winding isolation output of transformer T1.
Advantage of the present utility model: 1) used circuit of power factor correction, made electric current there is High Power Factor, reduced reactive loss, improved utilization rate of electrical; 2) replaced the high electrochemical capacitor of failure rate, extended useful life, reliability gets a promotion; 3) use quasi-resonance technology to raise the efficiency, reduced electromagnetic disturbance level.
Brief description of the drawings
Fig. 1 is the structured flowchart of the power supply of power information acquisition terminal of the present utility model;
Fig. 2 is the circuit diagram of the power supply of power information acquisition terminal of the present utility model;
Fig. 3 is that power factor correction controller of the present utility model adopts peak-current mode current waveform to follow voltage waveform view;
Fig. 4 is voltage waveform view on continuous mode, discontinuous mode and quasi-resonant mode flyback metal-oxide-semiconductor;
Fig. 5 is the pin schematic diagram of the utility model power factor correction controller U1;
Fig. 6 is the pin schematic diagram of the utility model quasi-resonance controller U2.
Embodiment
Describe the utility model in detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, power supply for power information acquisition terminal of the present utility model, comprise primary-side circuitry and secondary-side circuitry, concrete annexation is: three-phase input ac voltage, by becoming pulsating dc voltage after rectified three-phase circuit, as the input of power factor correction (PFC) circuit, the output of power factor correction (PFC) circuit becomes galvanic current pressure after circuit after filtering, again this direct voltage is passed through to DC-DC quasi-resonance circuit of reversed excitation, isolation output.Output circuit comprises main road output and bypass output, main road output and bypass output are by primary side winding and the primary side winding isolation output of transformer T1, main road output to quasi-resonance controller U2, is controlled bypass output by feedback network sampling and outputting voltage signal.
As shown in Figure 2, rectified three-phase circuit of the present utility model forms three-phase bridge full-wave rectifying circuit by rectifier diode.
Power factor correction (PFC) circuit is by power factor correction controller U1, PFC switch MOS pipe Q1, and PFC boost inductance L1 forms, and as shown in Figure 5, power factor correction controller U1 of the present utility model adopts the STL6562 of ST Microelectronics.The GD of power factor correction controller U1 drives pin, grid series winding with PFC switch MOS pipe Q1, the drain electrode series winding of PFC boost inductance L1 and PFC switch MOS pipe Q1, PFC boost inductance L1 and rectified three-phase circuit are in series, and PFC switch MOS pipe Q1 and rectified three-phase circuit are in parallel.The utility model adopts peak current control program, power factor correction controller U1 connects input voltage sample circuit and input current sample circuit, an input of input voltage sample circuit access power factor correcting controller U1 comparator, be the MULT input in Fig. 5, adopt the electric resistance partial pressure mode input voltage of sampling; Another input of input current sample circuit access power factor correcting controller U1 comparator, i.e. ZCD input in Fig. 5, together with employing sampling coil is closely wound on PFC boost inductance L1, the current waveform on sampling PFC boost inductance L1.
As shown in Figure 2, filter circuit of the present utility model comprises PFC rectifier diode D1 and filter capacitor C1, and wherein PFC rectifier diode D1 and rectified three-phase circuit are in series, and filter capacitor C1 and rectified three-phase circuit are in parallel.
As shown in Figure 2, quasi-resonance circuit of reversed excitation of the present utility model comprises quasi-resonance controller U2, switch MOS pipe Q2, transformer T1 and feedback network.Transformer T1 comprises primary side winding and primary side winding, and 5 pin of quasi-resonance controller U2 are that the DRV in Fig. 6 drives pin, the grid of connecting valve metal-oxide-semiconductor Q2; The first side winding of the drain electrode connection transformer T1 of switch MOS pipe Q2, primary side winding connects main road output circuit; The primary side winding of transformer T1 connects bypass output circuit; The signal of feedback network sampling main road output circuit, feeds back to 2 pin of quasi-resonance controller U2, i.e. FB pin in Fig. 6.
Quasi-resonance controller U2 is also connected with the lowest point testing circuit, and the lowest point testing circuit is realized by auxiliary winding mode, and auxiliary winding connects the ZCD pin of a resistance to power factor correction controller U1.This circuit is assisted voltage system on winding by detection, sense switch metal-oxide-semiconductor Q2 drain-source voltage, and in the time that voltage is minimum, quasi-resonance controller U2 control switch metal-oxide-semiconductor Q2's is open-minded.
The utility model adopts two stage power factor correcting technology at power input, and the first order is power factor correction and rectifying and wave-filtering part, and the second level is pulse-width modulation flyback output.
Power factor refers to the relation between effective power and apparent power, and namely effective power is divided by the ratio of total power consumption (apparent power).That is:
In the principles of electric and electronic engineering, the power factor of linear circuit (PF) habitual definition is cos φ, and φ is the phase angle difference between sinusoidal voltage and sinusoidal current.So the phase difference of managing to reduce between input voltage and input current just can improve power factor.
The utility model increases active power factor correction (PFC) circuit after power information acquisition terminal power supply input rectifying, input voltage waveform frequency only has 50Hz, input voltage sample circuit detects the phase place of input voltage waveform by electric resistance partial pressure mode, as benchmark, as the input of comparator in power factor correction controller U1.Input current sample circuit is the current waveform utilizing on magnet ring coupled modes sampling PFC boost inductance L1, together with this sampling coil being closely wound on PFC boost inductance L1 in actual use, by the waveform of PFC boost inductance L1 another input of device as a comparison.Utilize comparator control metal-oxide-semiconductor conducting and shutoff, meanwhile, current waveform when series resistance sampling MOS opens in metal-oxide-semiconductor, feeds back to 4 pin of power factor correction controller U1, as overcurrent protection.
As shown in Figure 3, figure cathetus is the current waveform after input rectifying, i.e. current waveform on PFC boost inductance L1, and dotted line is input voltage waveform.Under peak-current mode, owing to there being PFC boost inductance L1, this inductance suppresses electric current, and metal-oxide-semiconductor Q1 opens in situation the metal-oxide-semiconductor Q1 cleanliness that powers on and rises, and the rate of rise is determined by PFC boost inductance L1.In the time that current waveform rises to output voltage waveforms, metal-oxide-semiconductor Q1 is turn-offed in comparator action, waits next cycle to arrive, so repeatedly.Final formation as shown in Figure 3, current waveform is followed voltage waveform, thereby reduces the phase angle between input voltage and input current, improves power factor.Fig. 3 is schematic diagram, and actual operating frequency is up to tens KHz, and current waveform, in a half cycle, is opened number of times very many.
In common current rectifying and wave filtering circuit, due to the energy storage effect of the non-linear and electric capacity of rectifying device, even if input voltage is sinusoidal, but there is distortion in input current, and input current effective value is:
Irms = Σ n = 1 ∞ Irms 2 ( n )
In formula, Irms (n) is the effective value of nth harmonic.
Weigh current waveform distortion and adopt total harmonic distortion (THD), it is defined as:
Be that power factor is lower, distort more serious, harmonic wave is also more serious.
Adopt after first order power factor correction of the present utility model, high-frequency circuit is linear to rise, and input current waveform is followed voltage waveform, thereby has reduced harmonic distortion, has improved the quality of power supply of electrical network.
Second level power factor correction technology adopts quasi-resonance flyback topology, and feature is to utilize the lowest point testing circuit control metal-oxide-semiconductor in the lowest point conducting, reduces metal-oxide-semiconductor switching loss, has improved efficiency, has reduced the electromagnetic interference by power generation.Switching loss can be expressed as:
Ploss = 1 2 · V ds · I d · t on · f s + 1 2 · Coss · V ds 2 · f s
In formula, Ploss is switching loss, I dfor metal-oxide-semiconductor drain current, V dsfor the voltage on metal-oxide-semiconductor, Coss is metal-oxide-semiconductor equivalent capacitance value, t onfor metal-oxide-semiconductor ON time, f sfor switching frequency.
For power information acquisition terminal power supply, input voltage is higher, direct voltage V after rectification dcapproximately 540V~700V, adds the reflected voltage of flyback power supply, its V dsup to 640V~800V.As shown in Figure 4, common continuous mode flyback power supply is before metal-oxide-semiconductor is opened, and the voltage being added on metal-oxide-semiconductor just equals V ds, efficiency is not high.And common discontinuous mode flyback power supply is due to transformer primary side inductance and metal-oxide-semiconductor equivalence output junction capacitance resonance, the voltage on metal-oxide-semiconductor is being beated, and metal-oxide-semiconductor conducting voltage is fixing, and this will produce serious electromagnetic interference.And quasi-resonant mode is operated in similar discontinuous mode, detect the upper voltage of MOS by testing circuit, when voltage drop on metal-oxide-semiconductor is during to minimum point, control metal-oxide-semiconductor conducting, so both can raise the efficiency the electromagnetic interference of having avoided again ringing effect to bring.
Metal-oxide-semiconductor is operated in high frequency state, and conventionally operating frequency is tens KHz, and common commutation frequency be power frequency is 50Hz.Under identical load power condition, because operating frequency raises, so the capacitance needing reduces, utilize low-capacitance electric capacity can complete filtering work thereby realize.In addition the utility model adopts secondary PFC structure, contains second level circuit of reversed excitation part, thus less demanding to first order output ripple, can select the capacitor that capacity is less.Capacitor life-span is relevant with capacitor material, contains electrolyte in electrolysis, not higher containing liquid electrolytic capacitor failure rate than solid-state, and the life-span of capacitor and capacity be inversely proportional to, and capacitance is larger, and failure rate is larger.The utility model has used high voltage thin film electric capacity to replace high-voltage electrolytic capacitor, improves product reliability.

Claims (9)

1. for a power supply for power information acquisition terminal, it is characterized in that, comprise primary-side circuitry and secondary-side circuitry, described primary-side circuitry comprises the rectified three-phase circuit, circuit of power factor correction, filter circuit and the quasi-resonance circuit of reversed excitation that connect successively; Described secondary-side circuitry comprises output circuit.
2. a kind of power supply for power information acquisition terminal according to claim 1, is characterized in that, described rectified three-phase circuit forms three-phase bridge full-wave rectifying circuit by rectifier diode.
3. a kind of power supply for power information acquisition terminal according to claim 1, it is characterized in that, described circuit of power factor correction is by power factor correction controller U1, PFC switch MOS pipe Q1, PFC boost inductance L1 forms, the grid series winding of the driving pin of described power factor correction controller U1 and described PFC switch MOS pipe Q1, the drain electrode series winding of described PFC boost inductance L1 and described PFC switch MOS pipe Q1, described PFC boost inductance L1 and rectified three-phase circuit are in series, and described PFC switch MOS pipe Q1 and rectified three-phase circuit are in parallel.
4. a kind of power supply for power information acquisition terminal according to claim 3, it is characterized in that, described power factor correction controller U1 is also connected with input voltage sample circuit and input current sample circuit, an input of described input voltage sample circuit access power factor correcting controller U1 comparator, adopts the electric resistance partial pressure mode input voltage of sampling; Another input of described input current sample circuit access power factor correcting controller U1 comparator, together with employing sampling coil is closely wound on PFC boost inductance L1, the current waveform on sampling PFC boost inductance L1.
5. a kind of power supply for power information acquisition terminal according to claim 1, it is characterized in that, described filter circuit comprises PFC rectifier diode D1 and filter capacitor C1, described PFC rectifier diode D1 and rectified three-phase circuit are in series, and described filter capacitor C1 and rectified three-phase circuit are in parallel.
6. a kind of power supply for power information acquisition terminal according to claim 5, is characterized in that, described filter capacitor C1 is high voltage thin film electric capacity.
7. a kind of power supply for power information acquisition terminal according to claim 1, is characterized in that, described quasi-resonance circuit of reversed excitation comprises quasi-resonance controller U2, switch MOS pipe Q2, transformer T1 and feedback network; Described transformer T1 comprises primary side winding and primary side winding; The driving pin of described quasi-resonance controller U2 connects the grid of described switch MOS pipe Q2, and the drain electrode of described switch MOS pipe Q2 connects the first side winding of described transformer T1, and described primary side winding connects main road output circuit; The primary side winding of described transformer T1 connects bypass output circuit; The signal of described feedback network sampling main road output circuit, feeds back to 2 pin of described quasi-resonance controller U2.
8. a kind of power supply for power information acquisition terminal according to claim 7, it is characterized in that, described quasi-resonance controller U2 is also connected with the lowest point testing circuit, and described the lowest point testing circuit connects the ZCD pin of a resistance to power factor correction controller U1 by auxiliary winding.
9. a kind of power supply for power information acquisition terminal according to claim 1, it is characterized in that, described output circuit comprises main road output and bypass output, and described main road output and bypass output are by primary side winding and the primary side winding isolation output of transformer T1.
CN201420286877.7U 2014-05-30 2014-05-30 A kind of power supply for power information acquisition terminal Active CN203951366U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420286877.7U CN203951366U (en) 2014-05-30 2014-05-30 A kind of power supply for power information acquisition terminal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420286877.7U CN203951366U (en) 2014-05-30 2014-05-30 A kind of power supply for power information acquisition terminal

Publications (1)

Publication Number Publication Date
CN203951366U true CN203951366U (en) 2014-11-19

Family

ID=51893381

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201420286877.7U Active CN203951366U (en) 2014-05-30 2014-05-30 A kind of power supply for power information acquisition terminal

Country Status (1)

Country Link
CN (1) CN203951366U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103997226A (en) * 2014-05-30 2014-08-20 国家电网公司 Power source for electricity utilizing information collecting terminal
CN106208667A (en) * 2016-07-20 2016-12-07 广东双核电气有限公司 Novel quantum generator power supply converting system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103997226A (en) * 2014-05-30 2014-08-20 国家电网公司 Power source for electricity utilizing information collecting terminal
CN106208667A (en) * 2016-07-20 2016-12-07 广东双核电气有限公司 Novel quantum generator power supply converting system

Similar Documents

Publication Publication Date Title
CN102014559B (en) Light-emitting diode light source driving power supply
CN103346686B (en) A kind of DC source based on the power taking of current transformer resonance
CN103595027B (en) Method for preventing power output currents from flowing backwards
CN102281006A (en) Novel three-level soft switching converter
CN107800312B (en) A kind of output ripple and low pfc converter
CN103840670A (en) Energy-saving type high-frequency switching power source
CN110365205A (en) A kind of high efficiency totem non-bridge PFC Rectifier
CN202949266U (en) Intelligent charger
CN105140908A (en) Zero-voltage soft-switching control method for photovoltaic high-voltage DC transmission system
CN104578844A (en) Switching mode power supply circuit
CN202455256U (en) Speed adjustment controller of dual-purpose compressor with alternating current-direct current
CN203951366U (en) A kind of power supply for power information acquisition terminal
CN102447396A (en) Transformer with high set-up ratio, solar inverter and solar battery system
CN202424530U (en) LLC circuit and LLC power supply
CN106059306A (en) Multi-unit diode capacitor network high-gain full-bridge isolated direct current converter
CN105978327A (en) Boost converter and control method therefor
CN102122891A (en) Absorption feedback circuit for transformer leakage inductance energy
CN103986185B (en) A kind of photovoltaic combining inverter with active power decoupling zero function
CN202931197U (en) Flyback converter based on transformer transformation
CN108365626A (en) A kind of intelligent residential district power supply system based on solid-state transformer
CN108023411A (en) A kind of single-phase contactless power supply system with power factor emendation function
CN202475260U (en) High step-up ratio converter, solar energy inverter and solar energy cell system
CN103997226A (en) Power source for electricity utilizing information collecting terminal
CN201910951U (en) Light emitting diode (LED) light source drive power supply
CN203219215U (en) Solar energy system comprising power optimizing apparatus

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant