CN103368235B - Nickel-metal hydride battery charge-discharge circuit in uninterruptible power supply - Google Patents

Nickel-metal hydride battery charge-discharge circuit in uninterruptible power supply Download PDF

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Publication number
CN103368235B
CN103368235B CN201310324538.3A CN201310324538A CN103368235B CN 103368235 B CN103368235 B CN 103368235B CN 201310324538 A CN201310324538 A CN 201310324538A CN 103368235 B CN103368235 B CN 103368235B
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China
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power supply
discharge
charge
nickel
metal hydride
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CN201310324538.3A
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CN103368235A (en
Inventor
董银虎
管恩怀
赵书伟
路瑜亮
王京民
郭玺
王大海
葛鹏
郝晓阳
孟宪高
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Shijiazhuang Guoyuo Electrnic Science & Technology Co., Ltd.
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Shijiazhuang Guoyuo Electrnic Science & Technology Co Ltd
SHENZHEN GUOYAO ELECTRONICS TECHNOLOGY Co Ltd
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Abstract

The invention discloses a nickel-metal hydride battery charge-discharge circuit in an uninterruptible power supply. The nickel-metal hydride battery charge-discharge circuit in the uninterruptible power supply comprises a charger, a discharge diode and a charge and discharge control circuit; the charge and discharge control circuit comprises a singlechip, a charging relay and a charging MOS (metal oxide semiconductor) tube; the charger charges a nickel-metal hydride battery through the normally open contact of the charging relay and is connected with the input end of a direct-current booster of the uninterruptible power supply through the normally closed contact of the charging relay; the control signal input end of the charger is connected with the output port of the singlechip; the charging MOS tube controls a charging relay control coil; the gate of the charging MOS tube is connected with the output port of the singlechip; the output voltage of the nickel-metal hydride battery is connected with a voltage sampling port of the singlechip after being subjected to partial pressure by a first resistor and a second resistor; a third resistor is connected in series between the cathode of the nickel-metal hydride battery and the output ground of the charger; the output signal of the third resistor is connected with a current sampling port of the singlechip; and the nickel-metal hydride battery supplies power to an inverter through the discharge diode. By the nickel-metal hydride battery charge-discharge circuit in the uninterruptible power supply, charging frequency is greatly reduced, so that the service life of the nickel-metal hydride battery is prolonged, and the operation cost and the maintenance cost of the uninterruptible power supply are reduced.

Description

Nickel-metal hydride battery charge-discharge circuit in a kind of uninterrupted power supply
Technical field
The present invention relates to a kind of battery charger preventing the frequent discharge and recharge of uninterrupted power supply interior nickel hydrogen battery, belong to power technique fields.
Background technology
Because lead-acid battery and lithium battery can not heavy-current discharges under cryogenic, the uninterrupted power supply therefore worked in low temperature environment generally need select Ni-MH battery.The charging modes of Ni-MH battery and lead-acid battery and lithium battery different, can not floating charge for a long time, can only adopt constant current charge mode.Will quit work after battery is full of electricity by the constant current charger of existing uninterrupted power supply, but for realizing online zero handoff functionality of uninterrupted power supply, Ni-MH battery keeps warm standby state always, that is Ni-MH battery is in low discharging current state after being full of electricity always, the charge cycle of Ni-MH battery is caused to shorten, the charging frequency increases, and greatly reduces the useful life of Ni-MH battery, improves the operation and maintenance cost of uninterrupted power supply.
Summary of the invention
The object of the invention is to the drawback for prior art, provide a kind of uninterrupted power supply inner nickel-hydrogen battery charging circuit, to extend the useful life of Ni-MH battery, reduce the operation and maintenance cost of uninterrupted power supply.
Problem of the present invention realizes with following technical proposals:
Nickel-metal hydride battery charge-discharge circuit in a kind of uninterrupted power supply, formation comprises charger, discharge diode and charge-discharge control circuit, described charge-discharge control circuit comprises single-chip microcomputer, charge relay, charging metal-oxide-semiconductor and three resistance, described charger connects the DC boosting input of uninterrupted power supply through the normally opened contact of charge relay to Ni-MH battery charging through the normally-closed contact of charge relay, its control signal input connects the output port of single-chip microcomputer; Described charging metal-oxide-semiconductor controls charge relay control coil, and its grid connects the output port of single-chip microcomputer; The output voltage of Ni-MH battery connects the voltage sample port of single-chip microcomputer after the first resistance and the second electric resistance partial pressure, and the 3rd resistance is serially connected in nickel-hydrogen battery negative pole and charger exports between ground, and its output signal connects the current sample port of single-chip microcomputer through amplifier; Ni-MH battery is powered to the DC voltage booster circuit of uninterrupted power supply through discharge diode.
Nickel-metal hydride battery charge-discharge circuit in above-mentioned uninterrupted power supply, electric discharge relay, electric discharge metal-oxide-semiconductor and D.C. contactor is also comprised in formation, Ni-MH battery two ends are connected to after the described normally opened contact of electric discharge relay is connected in series with the control coil of D.C. contactor, the control coil of described electric discharge metal-oxide-semiconductor controlled discharge relay, its grid connects the output port of single-chip microcomputer; The normally opened contact of described D.C. contactor is attempted by discharge diode.
Nickel-metal hydride battery charge-discharge circuit in above-mentioned uninterrupted power supply, described charger comprises rectifier bridge, switching tube, transformer, rectifier diode and PWM isolated drive circuit, the direct voltage that rectifier bridge exports is connect after the primary coil of described switching tube and transformer is connected in series, the input of described PWM isolated drive circuit connects the output port of single-chip microcomputer, and it exports the grid of termination switching tube; The secondary coil one termination charger of described transformer exports ground, and one end connects the common of charge relay through rectifier diode.
Nickel-metal hydride battery charge-discharge circuit in above-mentioned uninterrupted power supply, described charge-discharge control circuit is powered by DC/DC accessory power supply, the direct-flow input end of the input termination uninterrupted power supply of described accessory power supply.
Nickel-metal hydride battery charge-discharge circuit in above-mentioned uninterrupted power supply, on the control coil of described charge relay and electric discharge relay all and be connected to fly-wheel diode.
Nickel-metal hydride battery charge-discharge circuit in above-mentioned uninterrupted power supply, is serially connected with fuse in the discharge loop of Ni-MH battery.
Charge-discharge control circuit of the present invention can carry out Real-Time Monitoring to the voltage of Ni-MH battery, when after battery charging complete, charger output is switched to the DC boosting input of uninterrupted power supply, by charger for uninterrupted power supply provides energy consumption needed for Hot Spare; When Ni-MH battery causes cell voltage to reduce because of self discharge, capacity reduces thereupon, Single Chip Microcomputer (SCM) program is according to the sampled voltage of Ni-MH battery, calculate battery capacity, when Ni-MH battery capacity drops to 80% of rated value, charger output is switched to Ni-MH battery by charge-discharge control circuit again, starts to charge to Ni-MH battery.Because Ni-MH battery need not provide Hot Spare energy after being full of electricity, greatly reduce the velocity of discharge of battery, decrease the charging frequency, thus extend the useful life of Ni-MH battery, reduce the operation and maintenance cost of uninterrupted power supply.In addition, the present invention also has that circuit structure is simple, with low cost, high reliability.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is electrical schematic diagram of the present invention.
In figure, each list of reference numerals is: B, Ni-MH battery; U1, single-chip microcomputer; U2, PWM isolation drive; ZQ, rectifier bridge; DC/DC, accessory power supply; T, transformer; NB, uninterrupted power supply DC boosting; K1, electric discharge relay; K2, charge relay; K3, D.C. contactor; D1, the first fly-wheel diode; D2, the second fly-wheel diode; D3, discharge diode; D4, rectifier diode; T1, electric discharge metal-oxide-semiconductor; T2, charging metal-oxide-semiconductor; T3, switching tube; R1 ~ R3, the first resistance ~ the 3rd resistance; FU, fuse.
Embodiment
Referring to Fig. 1, the present invention is made up of charger, discharge diode, accessory power supply and charge-discharge control circuit.Wherein charger is made up of PWM isolation drive U2, rectifier bridge ZQ, transformer T, rectifier diode D4 and switch transistor T 3; Charge-discharge control circuit is made up of single-chip microcomputer U1, electric discharge relay K 1, charge relay K2, D.C. contactor K3, the first sustained diode 1, second sustained diode 2, discharge diode D3, electric discharge metal-oxide-semiconductor T1, charging metal-oxide-semiconductor T2, the first resistance R1 ~ the 3rd resistance R3 and fuse FU, and accessory power supply is that charge-discharge control circuit is powered.
The operation principle of this circuit is as follows:
The terminal voltage of the bleeder circuit monitoring Ni-MH battery B that single-chip microcomputer U1 consists of the first resistance R1 and the second resistance R2, judge that Ni-MH battery B is the need of charging, monitored the charging current of Ni-MH battery B by the 3rd resistance R3, and control the output current of constant current charger.When Ni-MH battery B be monitored to be full of electricity time, the P1.3 port of single-chip microcomputer U1 provides low level signal, and this signal delivers to the grid of electric discharge metal-oxide-semiconductor T1, electric discharge metal-oxide-semiconductor T1 cut-off, electric discharge relay K 1 is disconnected, and after electric discharge relay K 1 disconnects, D.C. contactor K3 disconnects, meanwhile, the low level signal that the P1.4 port of single-chip microcomputer U1 also provides, this signal delivers to the grid of charging metal-oxide-semiconductor T2, charging metal-oxide-semiconductor T2 cut-off, the normally opened contact of charge relay K2 disconnects, normally-closed contact closes, the output of charger is made to be connected to the input of the DC boosting NB of uninterrupted power supply, simultaneously, control program by the output voltage stabilization of charger on maximum charging voltage, the now terminal voltage of charger output voltage >=Ni-MH battery B, i.e. cathode voltage >=its anode voltage of discharge diode D3, Ni-MH battery B can not outwards discharge, battery also can not be charged.Now, direct current input Hot Spare power demand is provided by charger completely.
When the interchange input of uninterrupted power supply occurs abnormal, charger output voltage V+ reduces rapidly, as the conduction voltage drop+charger output voltage V+ of the terminal voltage >=discharge diode D3 of Ni-MH battery B, the input of uninterrupted power supply DC boosting NB is powered by discharge diode D3 by Ni-MH battery B, realizes uninterrupted power supply zero handoff functionality.Meanwhile, the P1.3 port of single-chip microcomputer U1 provides high level signal, this signal delivers to the grid of electric discharge metal-oxide-semiconductor T1, electric discharge metal-oxide-semiconductor T1 conducting, and then guiding discharge relay K 1 adhesive, after the adhesive of electric discharge relay K 1, D.C. contactor K3 adhesive, discharge diode D3, by D.C. contactor K3 short circuit, ensures that discharge diode D3 does not work long hours, decreases the loss of energy.In whole process, Vin+ is not less than battery undervoltage voltage, and accessory power supply working stability is normal.
When the voltage of Ni-MH battery B is detected too low, uninterrupted power supply DC boosting NB under-voltage protection, no longer consuming cells electricity.When exchanging input and recovering normal, the output signal of its P1.4 port is adjusted to high level by single-chip microcomputer U1, and this level delivers to charging metal-oxide-semiconductor T2 grid, charging metal-oxide-semiconductor T2 conducting, charge relay K2 adhesive, makes V+ be connected to the positive pole of Ni-MH battery B, starts to charge to Ni-MH battery B.Now the P1.3 port of single-chip microcomputer U1 is low level, and D.C. contactor K3 disconnects, charger for battery charging while by diode D3 for uninterrupted power supply DC boosting NB provides Hot Spare DC power supply.
Fuse FU effect is in circuit protection Ni-MH battery B and DC circuit; First sustained diode 1 and acting as of the second sustained diode 2 slow down surge voltage disturbance.

Claims (5)

1. the nickel-metal hydride battery charge-discharge circuit in a uninterrupted power supply, it is characterized in that, described circuit comprises charger, discharge diode (D3) and charge-discharge control circuit, described charge-discharge control circuit comprises single-chip microcomputer (U1), charge relay (K2) and charging metal-oxide-semiconductor (T2), and described charger connects the input of uninterrupted power supply DC boosting (NB) through the normally opened contact of charge relay (K2) to Ni-MH battery (B) charging through the normally-closed contact of charge relay (K2); The drain electrode of described charging metal-oxide-semiconductor (T2) connects the control coil of charge relay (K2), and its grid connects the P1.4 port of single-chip microcomputer (U1), the source ground of charging metal-oxide-semiconductor; The output voltage of Ni-MH battery (B) connects the voltage sample port of single-chip microcomputer (U1) after the first resistance (R1) and the second resistance (R2) dividing potential drop, 3rd resistance (R3) is serially connected in Ni-MH battery (B) negative pole and charger exports between ground, and the output signal of the 3rd resistance (R3) connects the current sample port of single-chip microcomputer (U1); Ni-MH battery (B) is powered to the DC boosting of uninterrupted power supply (NB) through discharge diode (D3);
Electric discharge relay (K1), electric discharge metal-oxide-semiconductor (T1) and D.C. contactor (K3) is also comprised in formation, Ni-MH battery (B) two ends are connected to after the normally opened contact of described electric discharge relay (K1) is connected in series with the control coil of D.C. contactor (K3), the drain electrode of described electric discharge metal-oxide-semiconductor (T1) connects the control coil of electric discharge relay (K1), grid connects the P1.3 port of single-chip microcomputer (U1), electric discharge metal-oxide-semiconductor source ground; The normally opened contact of described D.C. contactor (K3) is attempted by discharge diode (D3).
2. the nickel-metal hydride battery charge-discharge circuit in a kind of uninterrupted power supply according to claim 1, it is characterized in that, described charger comprises rectifier bridge (ZQ), switching tube (T3), transformer (T), rectifier diode (D4) and PWM isolated drive circuit (U2), the direct voltage that rectifier bridge (ZQ) exports is connect after described switching tube (T3) and the primary coil of transformer (T) are connected in series, the input of described PWM isolated drive circuit (U2) connects the P1.2 port of single-chip microcomputer (U1), and it exports the grid of termination switching tube (T3); The secondary coil one termination charger of described transformer (T) exports ground, and one end connects the common of charge relay (K2) through rectifier diode (D4).
3. the nickel-metal hydride battery charge-discharge circuit in a kind of uninterrupted power supply according to claim 2, it is characterized in that, described charge-discharge control circuit is powered by DC/DC accessory power supply, the input of input termination uninterrupted power supply DC boosting (NB) of described accessory power supply.
4. the nickel-metal hydride battery charge-discharge circuit in a kind of uninterrupted power supply according to claim 3, is characterized in that, on the control coil of described charge relay (K2) and electric discharge relay (K1) all and be connected to fly-wheel diode.
5. the nickel-metal hydride battery charge-discharge circuit in a kind of uninterrupted power supply according to claim 4, is characterized in that, is serially connected with fuse (FU) in the discharge loop of Ni-MH battery (B).
CN201310324538.3A 2013-07-30 2013-07-30 Nickel-metal hydride battery charge-discharge circuit in uninterruptible power supply Active CN103368235B (en)

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CN105305606B (en) * 2015-11-25 2017-02-22 江永县元杰科技有限公司 Self-powered monitoring device in power outage
CN110061560A (en) * 2019-05-24 2019-07-26 联正电子(深圳)有限公司 Off-line type uninterruptible power supply and its control method

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Effective date of registration: 20151109

Address after: 050035 No. 56, 3 Kunlun street, Shijiazhuang Development Zone, Hebei, China

Patentee after: Shijiazhuang Guoyuo Electrnic Science & Technology Co., Ltd.

Address before: 518129, 6 floor, 10 Dragon Industrial Zone, Buji Town, Shenzhen Town, Longgang District, Guangdong, Bantian

Patentee before: Shenzhen Guoyao Electronics Technology Co., Ltd.

Patentee before: Shijiazhuang Guoyuo Electrnic Science & Technology Co., Ltd.