CN103997226A - Power source for electricity utilizing information collecting terminal - Google Patents
Power source for electricity utilizing information collecting terminal Download PDFInfo
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- CN103997226A CN103997226A CN201410235793.5A CN201410235793A CN103997226A CN 103997226 A CN103997226 A CN 103997226A CN 201410235793 A CN201410235793 A CN 201410235793A CN 103997226 A CN103997226 A CN 103997226A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The invention discloses a power source for an electricity utilizing information collecting terminal. A two-stage power factor correction technology is adopted in a power source input part, an active power factor correction and rectifying filtering part is adopted as the first stage, and a pulse width modulation flyback output part is adopted as the second stage. The scheme of replacing a high voltage electrolytic capacitor with a high voltage thin-film capacitor is adopted in the first stage of rectifying filtering, and a quasi resonant technology is adopted in the second stage of pulse width modulation flyback output part. The active power-factor correction technology is adopted, the terminal power factor is greatly improved, reactive losses are reduced, the electric energy utilization rate is improved, and meanwhile the interference of harmonic waves generated by the rectifying part to the whole power grid is reduced.
Description
Technical field
The present invention relates to a kind of power supply for power information acquisition terminal, belong 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.
Summary of the invention
The invention provides a kind of power supply for power information acquisition terminal, 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 solution adopted in the present invention 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 invention: 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 invention;
Fig. 2 is the circuit diagram of the power supply of power information acquisition terminal of the present invention;
Fig. 3 is that power factor correction controller of the present invention 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 power factor correction controller U1 of the present invention;
Fig. 6 is the pin schematic diagram of quasi-resonance controller U2 of the present invention.
Embodiment
Describe the present invention 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 invention, 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 invention 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 invention 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 present invention 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 invention 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 invention 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 present invention 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 present invention 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:
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 invention, 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:
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 present invention 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 present invention 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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410235793.5A CN103997226A (en) | 2014-05-30 | 2014-05-30 | Power source for electricity utilizing information collecting terminal |
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|---|---|---|---|
| CN201410235793.5A CN103997226A (en) | 2014-05-30 | 2014-05-30 | Power source for electricity utilizing information collecting terminal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105301351A (en) * | 2015-12-04 | 2016-02-03 | 中国电力科学研究院 | Power supply alternating current acquisition module for power consumption information acquisition system modularization terminal |
| CN106849638A (en) * | 2017-02-24 | 2017-06-13 | 深圳市华星光电技术有限公司 | A kind of power circuit and liquid crystal display |
| CN113595419A (en) * | 2021-06-17 | 2021-11-02 | 中国电力科学研究院有限公司 | Power panel of relay protection device and configuration method thereof |
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Application publication date: 20140820 |