CN101572420A - Current type double-input uninterrupted switch power supply - Google Patents
Current type double-input uninterrupted switch power supply Download PDFInfo
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Abstract
The invention relates to a current type double-input uninterrupted switch power supply comprising a main power transformer, a high-voltage switch circuit, a low-voltage switch circuit, a pulse width modulator and a central control unit. The central control unit samples the current of the high voltage switch circuit, the low voltage switch circuit and the voltage of an output circuit and then analyzes and judges the current and the voltage, and controls the output of the pulse width modulator to further control the work of the high-voltage switch circuit and the low-voltage switch circuit. The main power transformer comprises a first winding connected with the high-voltage switch circuit, a second winding connected with the output circuit, a third winding connected with the low-voltage switch circuit, and a forth winding used for providing power for the pulse width modulator and the central control unit, wherein and the initial end of the third winding is connected with the tail end of the second winding and grounded. The current type double-input uninterrupted switch power supply not only has small volume, simple circuits, and low cost, but also has high reliability.
Description
Technical field
The present invention relates to the voltage transformation technology, be meant a kind of current type double-input uninterrupted switch power supply especially.
Background technology
Along with information industry develops rapidly, nearly all IT system all can be equipped traditional UPS, but adopts ups power, exists energy repeatedly to repeat conversion, problems such as cost height.And, from statistical analysis, between supply network and sensitive equipment, insert a reliability and be lower than 100% UPS, not to improve to the reliability of total system, but reduce.This is very simple and clear, is analyzed as follows:
If: an equipment is to the sensitivity of powering, the reliability of its its own power source is 99%, the power supply reliability that supply network offers this equipment is 99%, and the reliability that the then final load of this equipment (as: mainboard, hard disk etc.) obtains electric energy work from supply network is 99% * 99% ≈ 98%.
Establish again, if the possibility in order to protect this equipment to avoid 2% power supply to lose efficacy and adds a UPS, then this equipment finally load to the probability that chain between the electrical network socket is connected to following outage, examination is analyzed as follows:
Grid cut-off, UPS is normal, and load is protected, and is working properly.
Electrical network is normal, the UPS fault, and therefore load cuts off the power supply, and work is interrupted.
Grid cut-off, UPS can not protect, and therefore load cuts off the power supply, and work is interrupted.
The reliability of any electronic equipment can not be 1, and UPS is no exception, and the reliability of supposing UPS is 99%, then passes through UPS to the final load of this equipment from electrical network, and total reliability should be (98% * 99%) ≈ 97%.
So people begin to replace UPS with USPS (uninterrupted switch power supply), the power supply at sensitive equipment itself adds backup second energy in other words, avoids the every power supply Single Point of Faliure of device external.Its systems reliability analysis brief introduction is as follows:
As shown in Figure 4, two energy of AC and DC are inputs arranged side by side, in case the AC outage, DC remains what working, provide energy process electromagnetic conversion to output equally.If the reliability of the AC of this USPS part is 99%, the reliability of the DC part that adds in parallel is 99%, and then total reliability is: 1-(1-99%) * (1-99%) ≈ 99.99%.
Summary of the invention
The purpose of this invention is to provide a kind of reliability height, circuit is simple, cost is low, volume is little current type double-input uninterrupted switch power supply.
Current type double-input uninterrupted switch power supply of the present invention, comprise: main power transformer, the high pressure energy of input is coupled to the high-voltage switch gear loop of output loop through described main power transformer, the low tension switch loop of energy when being lower than set point or interrupting, input AC is provided to output loop through described main power transformer, a pulse width modulator and a centralized control unit, described centralized control unit is by the described high-voltage switch gear of sampling loop, the electric current in low tension switch loop and the voltage of output loop, after the analysis and judgement, the output of control pulse width modulator, and then control high-voltage switch gear loop and low tension switch loop works, wherein, described main power transformer comprises:
First winding, it is connected in the described high-voltage switch gear loop;
Second winding, it is connected in the described output loop;
The tertiary winding, it is connected in the described low tension switch loop, and its head end is connected with the end of second winding and ground connection; And,
The 4th winding that is used for providing power supply to pulse width modulator and centralized control unit;
The number of turn N of this main power transformer tertiary winding
LCalculate definite by following formula:
N in the formula
HBe the number of turn of first winding that inserts the high-voltage switch gear loop, V
HTBe the lowest AC input voltage effective value of given low tension switch loop battery discharge starting point correspondence, V
LCMaximum for the tertiary winding both end voltage in the low tension switch loop.
During this power work, at the centralized control unit of high-pressure side work to the voltage sample of secondary output loop, simultaneously the current signal in high-voltage switch gear loop and low tension switch loop is sampled, judge by analysis, the output of control pulse width modulator (PWM), and then work simultaneously by high-voltage switch gear in the described PWM control high-voltage switch gear loop and the low tension switch in the low tension switch loop, make: when the AC input just often, the high-voltage switch gear loop is with first winding coupled to the second winding output of high voltage electric energy through main power transformer; When the AC input was lower than set point, described PWM control high-voltage switch gear loop and low tension switch loop provided energy simultaneously, and the energy that the low tension switch loop replenishes is coupled to the output of second winding through the tertiary winding of main power transformer; When the AC input was interrupted fully, the low tension switch loop provided whole institutes energy requirement under the control of described PWM, and energy is coupled to the output of second winding by the tertiary winding of main power transformer.In addition, when the AC input is arranged, with four winding of a part of couple electrical energy, power to centralized control unit to main power transformer by the high-voltage switch gear loop; When the AC input is interrupted, with four winding of a part of couple electrical energy, power to centralized control unit to main power transformer by the low tension switch loop.
Also can comprise an AC detecting unit that is used to detect the situation of input ac voltage.
Also can comprise a controlled charhing unit, the described output loop of this charhing unit input termination, the battery pack in the described low tension switch of output termination loop, the control end of this charhing unit is connected with the output of described AC detecting unit, controls controlled charhing unit and only imports just often just to batteries charging at AC.
Also can comprise a controlled battery cell monitoring unit, this battery cell monitoring unit comprises voltage sampling circuit and comparator, voltage sampling circuit to the voltage sample of the battery pack in described low tension switch loop after input comparator, relatively judge the discharge scenario of battery pack with reference voltage, thus the signal of comparator output battery condition.
This current type double-input uninterrupted switch power supply adopts the primary side current control mode, and it cooperates peripheral circuit by the design to main power transformer electromagnetic relationship, realized the two-way energy input function of compensation automatically, it is online uninterrupted to reach output, simultaneously, has obtained high conversion rate.The alternation procedure of two energy need not artificial logic control, and whole transfer process is slick and sly and do not have and interruptedly realize, has reduced the stress of power electronic device, avoids producing transient state sudden change (di/dt) and causes electromagnetic interference.
It is a kind of current-mode inverse-excitation type USPS, and not only volume is little, and circuit is simple, and cost is low, and the reliability height.
Description of drawings
Fig. 1 is a present embodiment current-mode inverse-excitation type uninterrupted switch power supply functional-block diagram;
Fig. 2 is its on high-tension side physical circuit figure;
Fig. 3 is the circuit diagram of its low-pressure side;
Fig. 4 is USPS systems reliability analysis figure.
Embodiment
Below in conjunction with accompanying drawing the present invention is elaborated.
With reference to Fig. 1, this current type double-input uninterrupted switch power supply, comprise: main power transformer 200, the high pressure energy of input is coupled to the high-voltage switch gear loop 100 of output loop 600 through described main power transformer, the low tension switch loop 400 of energy when being lower than set point or interrupting, input AC is provided to output loop 600 through described main power transformer, a pulse width modulator and a centralized control unit 301, (in the present embodiment, pulse width modulator is included in the centralized control unit 301), described centralized control unit 301 is by the described high-voltage switch gear of sampling loop 100, the voltage of the electric current in low tension switch loop 400 and output loop 600, after the analysis and judgement, the output of control pulse width modulator, and then control high-voltage switch gear loop 100 and 400 work of low tension switch loop, described main power transformer 200 comprises:
The tertiary winding 203, it is connected in the described low tension switch loop 400, and the tertiary winding 203 and second winding 202 are anti-phase and altogether, that is: and the tertiary winding 203 head ends are connected with the end of second winding 202 and connect low pressure ground; And,
The 4th winding 204 that is used for providing power supply to pulse width modulator and centralized control unit;
The number of turn N of this main power transformer tertiary winding 203
LCalculate definite by following formula:
N in the formula
HBe the number of turn of first winding 201 that inserts the high-voltage switch gear loop, V
HTBe the lowest AC input voltage effective value of given low tension switch loop battery discharge starting point correspondence, V
LCMaximum for 203 both end voltage of the tertiary winding in the low tension switch loop.The number of turn N of the tertiary winding 203
LThe absolute value of value is corresponding to the circuit of reversed excitation negative value, and is anti-phase with the output winding.Corresponding to forward converter, get on the occasion of, with output winding homophase, and insert the output winding.
High-voltage switch gear loop 100 comprises high-voltage switch gear 101, main power transformer first winding 201 and first current sampler 302, and the positive output end of high voltage direct current connects high pressure winding 201 (promptly main power transformer first winding 201), high-voltage switch gear 101 and the first current sampler 302 negative output terminal formation high-voltage switch gear loop to high voltage direct current successively.Described high-voltage dc voltage is formed behind input protection, High frequency filter, rectifying and wave-filtering by the AC input.
Low tension switch loop 400 comprises battery pack 401, low tension switch 404, second current sampler 304 and the main power transformer tertiary winding 203, the positive pole of battery pack 401 is connected to the end of the main power transformer tertiary winding 203 successively through isolating diode 402, second current sampler 304, low tension switch 404, the head end of the main power transformer tertiary winding 203 is connected with the negative pole of battery pack 401, thereby forms the low tension switch loop.
Centralized control unit 301, first current sampler 302, the driving transformer 303 and second current sampler 304 that are used to drive low tension switch have constituted control circuit 300, control circuit provides operating voltage by high voltage direct current through resistance R 52 when starting, starting the back provides operating voltage by main power transformer first winding 204.
This current type double-input uninterrupted switch power supply also comprises AC detecting unit 500, controlled battery cell monitoring unit 406, controlled charhing unit 407, Alarm Unit and output voltage sampling unit 605.
AC detecting unit 500 contains AC voltage sample network 501 and is located at the isolation optocoupler 502 of AC voltage sample network 501 outputs, and this detecting unit 500 is used to detect the situation of the alternating voltage that inserts described high-voltage switch gear loop 100.The output of AC detecting unit 500 will be controlled controlled battery cell monitoring unit 406, controlled charhing unit 407, Alarm Unit, make: normal as input AC, when battery pack 401 electric weight are discontented, charhing unit charges normal to battery pack; In case the charging output of input AC outage stopping immediately charge circuit provides the signal enabling Alarm Unit outputting alarm signal of AC dump simultaneously and starts battery cell monitoring unit 406.
The situation of the 406 pairs of battery pack 401 in controlled battery cell monitoring unit is carried out full-time ground sampling, compares with preset value, so that low warning information of battery and process interface and software realization monitoring and protection to power supply are provided.
The described output loop 600 of controlled charhing unit 407 input terminations, the battery pack 401 in the described low tension switch of output termination loop 400, the control end of this charhing unit 407 is connected with the output of described AC detecting unit 500, and this controlled charhing unit is only just often just charged to battery pack 401 in the AC input.
The whole system course of work is as follows:
When high-voltage dc voltage is set up, operating voltage is provided for centralized control unit 301 through resistance R 52, PWM work, drive high-voltage switch gear 101 and low tension switch 404 synchronous startup work, first winding 201 of main power transformer 200 produces high frequency magnetic field, be coupled to second winding 202 and export to stable low pressure of load through rectifying and wave-filtering again, produce an auxiliary low pressure at the 4th winding 204 simultaneously, give centralized control unit 301 power supplies.
Output voltage sampling unit 605 is imported centralized control unit 301 with output voltage feedback signal, simultaneously, first current sampler 302 and second current sampler 304 carry out waveform peak sampling one by one to the operating current in high-voltage switch gear loop and low tension switch loop respectively, and input centralized control unit 301, PWM through centralized control unit 301 inside after analyzing relatively modulates high-voltage switch gear 101 and low tension switch 404, to guarantee the stable of output voltage.
In case high voltage direct current power down; the low tension switch 404 of synchronousing working with high-voltage switch gear 101 has electric current to keep magnetic field energy and continued by the main power transformer tertiary winding 203 immediately provides stable voltage through second winding 202 to load; also work capacity is provided for centralized control unit 301 simultaneously through the 4th winding 204; and; also there is current sampling signal to enter 301 couples of PWM of centralized control unit and carries out Waveform Control and protection one by one; simultaneously; PWM in the centralized control unit 301 still is subjected to the control of the feedback signal of secondary output voltage sampling and carries out pulse-width modulation, to guarantee the stable of output voltage.
Fig. 2 and Fig. 3 are respectively the circuit diagram of this current type double-input uninterrupted switch power supply high-pressure side and low-pressure side.Wherein, first current sampler 302 adopts resistor R 53, second current sampler 304 adopts instrument transformer S1, high-voltage switch gear 101 adopts CMOS power switch pipe Q1, low tension switch 404 adopts CMOS power switch pipe Q2, PWM is included in the centralized control unit 301, and PWM drives high-voltage switch gear work, drives low tension switch work by driving transformer T2 by resistance R 51.
With reference to Fig. 2; main source of energy (being the AC input) is received a rectifier bridge BR1 through overprotection EMI filter network; the high voltage DC busses anode of rectifier bridge BR1 output is connected to first winding 201 of main power transformer 200; be connected to CMOS power switch pipe Q1 drain electrode; the source electrode of switching tube Q1 has been formed high-voltage switch gear loop 100 by the negative terminal that pulse current sampling resistor R53 receives high-voltage bus.The filter capacitor C6 of enough capacity jumps to negative terminal from rectifier bridge BR1 output plus terminal.The 4th winding 204 outputs of main power transformer insert the power supply input of centralized control unit 301 through rectifier diode D6 and filter capacitor C7, be centralized control unit 301 power supplies after startup, and when starting, give centralized control unit 301 power supplies through resistance R 52 by high-voltage bus.The PWM drive signal of centralized control unit 301 outputs is received the grid of switching tube Q1 through resistance R 51.PWM output of elementary this centralized control unit of access 301 of driving transformer T2 and ground, high-voltage switch gear loop end, the PWM drive signal is coupled to switching tube Q2 grid through this driving transformer T2.The secondary input of waveform sampling one by one of receiving centralized control unit 301 through diode D7 of sample rate current instrument transformer S1.Output voltage sampling unit 605 is received voltage sampling signal by optocoupler 305 the voltage sample input of centralized control unit 301.AC detecting unit 500 is connected to the AC input, and 502 isolation output to battery cell monitoring unit 406 and battery charging unit 407 through optocoupler in its output.
The course of work is as follows:
The AC input is set up high voltage DC busses voltage through input circuit, then give centralized control unit 301 power supplies by resistance R 52, start, centralized control unit 301 output pwm pulse driving switch pipe Q1 work, main power transformer 200 work go out low pressure at secondary induction and export to load through rectifying and wave-filtering.Centralized control unit 301 is accepted current sampling signal simultaneously and from the voltage feedback signal of sampling optocoupler 305, is carried out continuous comparison and adjustment, and output pwm signal control switch pipe Q1 again is to reach the purpose of regulated output voltage.Simultaneously, AC detecting unit 500 detects the situation of AC input, and export 502 outputs of an ACOK signal process optocoupler and deliver to battery cell monitoring unit 406 and battery charging unit 407, to realize following logic control:
1, when AC just often, no matter battery pack 401 whether connect or battery pack 401 electric weight whether low, do not shut down, by the AC powered operation.
2, when AC is unusual, during battery pack 401 is working properly, provide AC the alarm signal of outage; When AC unusual, battery pack 401 discharge at the end, battery cell monitoring unit 406 output off signals, forced shutdown.
3, when AC just often, open 407 pairs of battery pack of charhing unit 401 charging; When AC is unusual, turn-off charhing unit 407, stop charging.
Fig. 3 is the circuit diagram of present embodiment low-pressure side.Wherein:
Low voltage output loop 600 through the rectifying and wave-filtering network 601 of rectifier diode and filter capacitor composition, is received the load 602 of output by second winding 202 of main power transformer again, receives low pressure by load and forms altogether.Behind the normal boot-strap, any one is normal to need only the AC or low pressure second energy (being battery pack 401), and this output loop 600 will be kept stable voltage and export to load.
Controlled battery cell monitoring unit 406 comprises voltage sampling circuit and two comparator IC1A, IC1B, voltage sampling circuit is by three resistance R 6, R7 and R8 are composed in series, voltage sampling circuit to the voltage sample of the battery pack 401 in described low tension switch loop 400 after the input two comparator IC1A, IC1B, relatively judge the discharge scenario of battery pack 401 with reference voltage, the power end of the comparator of this battery cell monitoring unit 406 connects power supply by an electronic switch Q4, the control end of electronic switch Q4 is connected with the output of described AC detecting unit 500, control this battery cell monitoring unit 406 and only just can export the battery condition signal in the time of battery pack 401 discharges, when this unit 406 hangs down warning information at the output battery, export the forced shutdown signal simultaneously and give centralized control unit 301.After the start, the power supply that the ACOK signal controlling electronic switch Q4 of AC detecting unit output removes switch two comparator IC1A, IC1B, whether the decision comparator works, so that: as long as AC is normal, no matter whether battery pack 401 inserts, perhaps whether battery pack 401 electric weight are lower, all cannot export the signal that battery is low or shut down; Have only AC unusual, when battery discharge work is arranged, just can make this circuit working, battery power discharge is detected, when battery electric quantity is hanged down to certain default level, can export the battery low signal, control Alarm Unit 408 sends alarm; When in case battery hangs down to the critical level that discharge ends, will power cutoff.
Controlled charhing unit 407 is connected to the input of this unit by output loop 600, enters an inner circuit for regulating and controlling LM317, and output is received battery pack 401 positive poles, simultaneously, is connected with the output of AC detecting unit 500, to be subjected to the control of ACOK signal.When power supply behind the AC normal boot-strap, can from output loop 600 obtain voltage through charging control circuit to battery pack 401 charging, charge mode is selected according to the characteristic of different batteries, is full of up to battery, and keeps floating charge state.In case the AC outage, the ACOK signal automatically shuts down the output of this charging circuit, to avoid backflow.
Output voltage sampling unit 605 comprises reference circuit TL431 and optocoupler 305; simultaneously; these output voltage sampling unit 605 inputs also are connected with battery cell monitoring unit 406 1 outputs, at the end turn-off this power supply to be implemented in battery discharge, protection not overdischarge of battery and damaging.
Claims (6)
1, a kind of current type double-input uninterrupted switch power supply, comprise: main power transformer (200), the high pressure energy of input is coupled to the high-voltage switch gear loop (100) of output loop (600) through described main power transformer, the low tension switch loop (400) of energy when being lower than set point or interrupting, input AC is provided to output loop (600) through described main power transformer, a pulse width modulator and a centralized control unit (301), described centralized control unit is by the described high-voltage switch gear of sampling loop, the electric current in low tension switch loop and the voltage of output loop, after the analysis and judgement, the output of control pulse width modulator, and then control high-voltage switch gear loop and low tension switch loop works, it is characterized in that described main power transformer (200) comprising:
First winding (201), it is connected in the described high-voltage switch gear loop (100);
Second winding (202), it is connected in the described output loop (600);
The tertiary winding (203), it is connected in the described low tension switch loop (400), and its head end is connected with the end of second winding (202) and ground connection; And,
The 4th winding (204) that is used for providing power supply to pulse width modulator and centralized control unit;
The number of turn N of this main power transformer tertiary winding
LCalculate definite by following formula:
N in the formula
HBe the number of turn of first winding that inserts the high-voltage switch gear loop, V
HTBe the lowest AC input voltage effective value of given low tension switch loop battery discharge starting point correspondence, V
LCMaximum for the tertiary winding both end voltage in the low tension switch loop.
2, uninterrupted switch power supply according to claim 1, it is characterized in that: also comprise an AC detecting unit (500), this AC detecting unit contains AC voltage sample network (501) and is located at the isolation optocoupler (502) of AC voltage sample network output, and this detecting unit is used for detecting the situation of the alternating voltage that inserts described high-voltage switch gear loop (100).
3, uninterrupted switch power supply according to claim 2, it is characterized in that: also comprise a controlled charhing unit (407), this charhing unit input described output loop of termination (600), the battery pack in output termination described low tension switch loop (400), the control end of this charhing unit is connected with the output of described AC detecting unit (500), controls this charhing unit and only imports just often just to batteries charging at AC.
4, uninterrupted switch power supply according to claim 2, it is characterized in that: also comprise a controlled battery cell monitoring unit (406), this battery cell monitoring unit comprises voltage sampling circuit and comparator, voltage sampling circuit to the voltage sample of the battery pack in described low tension switch loop (400) after input comparator, relatively judge the discharge scenario of battery pack with reference voltage, thus comparator output battery condition signal.
5, uninterrupted switch power supply according to claim 1, it is characterized in that: described high-voltage switch gear loop (100) comprises high-voltage switch gear (101), main power transformer first winding (201) and first current sampler (302), and the positive output end of high voltage direct current connects main power transformer first winding (201), high-voltage switch gear (101) and first current sampler (302) negative output terminal to high voltage direct current successively;
Described low tension switch loop (400) comprises battery pack (401), low tension switch (404), second current sampler (304) and the main power transformer tertiary winding (203), the positive pole of battery pack (401) passes through the end that isolating diode (402), second current sampler (304), low tension switch (404) are connected to the main power transformer tertiary winding (203) successively, and the head end of the main power transformer tertiary winding (203) is connected with the negative pole of battery pack (401).
6, uninterrupted switch power supply according to claim 5 is characterized in that: described first current sampler (302) is a resistor, and second current sampler (304) is an instrument transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810066941XA CN101572420B (en) | 2008-04-30 | 2008-04-30 | Current type double-input uninterrupted switch power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810066941XA CN101572420B (en) | 2008-04-30 | 2008-04-30 | Current type double-input uninterrupted switch power supply |
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| CN101572420A true CN101572420A (en) | 2009-11-04 |
| CN101572420B CN101572420B (en) | 2011-05-04 |
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Cited By (12)
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| CN101707385B (en) * | 2009-11-12 | 2013-01-02 | 胡振辉 | Battery charging device |
| CN103026582A (en) * | 2010-05-27 | 2013-04-03 | 杰兴电子科技（深圳）有限公司 | Two-input uninterruptible voltage converting device and method thereof |
| CN103812207A (en) * | 2012-11-09 | 2014-05-21 | 河南省电力公司焦作供电公司 | Novel power supply device |
| CN104092227A (en) * | 2014-08-05 | 2014-10-08 | 国家电网公司 | Digital discharge coil connected with capacitor bank in parallel in power transmission and transformation system |
| CN104578257A (en) * | 2014-12-19 | 2015-04-29 | 合肥创源车辆控制技术有限公司 | High-voltage and high-power power supply |
| CN104600820A (en) * | 2014-12-30 | 2015-05-06 | 上海力申科学仪器有限公司 | Lead-acid cell quick charge control circuit |
| CN105259968A (en) * | 2015-11-27 | 2016-01-20 | 上海空间电源研究所 | Wide voltage output parallel flexible switching device and switching method thereof |
| CN108475942A (en) * | 2016-01-11 | 2018-08-31 | 赤多尼科两合股份有限公司 | The emergency lighting unit to be charged using AC power |
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| WO2019019297A1 (en) * | 2017-07-27 | 2019-01-31 | 深圳市泰昂能源科技股份有限公司 | Direct-current ups device, system, and control method |
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| CN2208721Y (en) * | 1994-09-10 | 1995-09-27 | 冉茂莘 | Intelligent energy-complementation type on-line UPS power source device |
| GB9500969D0 (en) * | 1995-01-18 | 1995-03-08 | Magnum Power Solutions Ltd | Uninterruptible power supplies |
| CN2563811Y (en) * | 2002-07-24 | 2003-07-30 | 冉茂鑫 | Self coupling mutual induction non-interruption switch power |
| CN201191769Y (en) * | 2008-04-30 | 2009-02-04 | 冉茂鑫 | Current type dual input non-interruption switch power-supply |
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| CN103026582A (en) * | 2010-05-27 | 2013-04-03 | 杰兴电子科技（深圳）有限公司 | Two-input uninterruptible voltage converting device and method thereof |
| CN103812207A (en) * | 2012-11-09 | 2014-05-21 | 河南省电力公司焦作供电公司 | Novel power supply device |
| CN104092227B (en) * | 2014-08-05 | 2016-04-06 | 国家电网公司 | The other digital discharge coil in parallel of Capacitor banks in a kind of power transmission and transformation system |
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| CN104578257A (en) * | 2014-12-19 | 2015-04-29 | 合肥创源车辆控制技术有限公司 | High-voltage and high-power power supply |
| CN104600820A (en) * | 2014-12-30 | 2015-05-06 | 上海力申科学仪器有限公司 | Lead-acid cell quick charge control circuit |
| CN105259968A (en) * | 2015-11-27 | 2016-01-20 | 上海空间电源研究所 | Wide voltage output parallel flexible switching device and switching method thereof |
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| CN108767974A (en) * | 2018-07-23 | 2018-11-06 | 厦门普杰信息科技有限公司 | A kind of power supply automatic switchover circuit of charged pool undervoltage turnoff |
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| CN113364112A (en) * | 2021-06-23 | 2021-09-07 | 安徽南瑞中天电力电子有限公司 | Automatic switching method and device for standby power supply of terminal |
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| CN101572420B (en) | 2011-05-04 |
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