CN104022554A - Battery charging and discharging circuit based on AT89C2051 single chip microcomputer and UC3842 chip - Google Patents
Battery charging and discharging circuit based on AT89C2051 single chip microcomputer and UC3842 chip Download PDFInfo
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- CN104022554A CN104022554A CN201410284358.1A CN201410284358A CN104022554A CN 104022554 A CN104022554 A CN 104022554A CN 201410284358 A CN201410284358 A CN 201410284358A CN 104022554 A CN104022554 A CN 104022554A
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Abstract
The invention discloses a battery charging and discharging circuit based on an AT89C2051 single chip microcomputer and a UC3842 chip. According to the battery charging and discharging circuit, the electric quantity of a nickel-metal hydride battery B is monitored by the AT89C2051 single chip microcomputer; when the electric quantity is lower than a rated value, the UC3842 chip is used for switching the output end of a charger to the nickel-metal hydride battery to start to charge the nickel-metal hydride battery, so as to continuously charge; when the electric quantity is fully charged, the UC3842 chip is used for detecting current flowing through a resistor R4 so as to narrow the conduction width through a current amplifier in the UC3842 chip; the output voltage is reduced until the UC3842 stops working and no triggering pulse is output; a field-effect tube is cut off so as to realize the aim of protecting a power tube; after a short-circuit phenomenon disappears, a power supply automatically recovers normal work. Therefore, the accuracy of charging the battery is effectively controlled and the over-charging is prevented; the characteristic of over-current protection of the UC3842 chip is sufficiently utilized so that the reliability of the circuit is enhanced.
Description
Technical field
The present invention relates to power technique fields, specifically a kind of battery impulse electricity road based on AT89C2051 single-chip microcomputer and UC3842 chip.
Background technology
Because lead-acid battery and lithium battery can not be at heavy-current discharges under cryogenic conditions, the uninterrupted power supply therefore working in low temperature environment generally need be selected Ni-MH battery.The charging modes of Ni-MH battery is different from lead-acid battery and lithium battery, and floating charge, can only adopt constant current charge mode for a long time.The constant current charger of existing uninterrupted power supply will quit work after battery is full of to electricity, but for realizing online zero handoff functionality of uninterrupted power supply, Ni-MH battery keeps Hot Spare state always, that is to say that Ni-MH battery is full of after electricity always in low discharging current state, cause the charge cycle of Ni-MH battery to shorten, the charging frequency increases, and greatly reduces the useful life of Ni-MH battery, has improved the operation and maintenance cost of uninterrupted power supply.
Summary of the invention
The object of the present invention is to provide a kind of battery charging and discharging circuit of uninterrupted power supply, to extend the useful life of Ni-MH battery, reduce the operation and maintenance cost of uninterrupted power supply, to solve the problem proposing in above-mentioned background technology.
For achieving the above object, the invention provides following technical scheme:
A kind of battery impulse electricity road based on AT89C2051 single-chip microcomputer and UC3842 chip, described circuit comprises charger, discharge diode D3, electric discharge relay K 1, charge-discharge control circuit and resistance R 1～4, described charge-discharge control circuit comprises single chip computer AT 89C2051, charge relay K2 and charging metal-oxide-semiconductor T2, described charger through the normally opened contact of charge relay K2 to Ni-MH battery B charging and connect the input of uninterrupted power supply DC boosting NB through the normally-closed contact of charge relay K2; Described charging metal-oxide-semiconductor T2 controls charge relay K2 control coil, and its grid connects the output port of single-chip microcomputer AT89C2051; Described resistance R 1 and resistance R 2 series connection, resistance R 1 and the resistance R 2 of series connection are in parallel with resistance R 4 again, the output voltage of described Ni-MH battery B connects the voltage sample port of single-chip microcomputer AT89C2051 after resistance R 1 and resistance R 2 dividing potential drops, the 3rd resistance R 3 is serially connected between Ni-MH battery B negative pole and charger output ground, and its output signal connects the current sample port of single-chip microcomputer AT89C2051; Ni-MH battery B is the DC boosting NB power supply to uninterrupted power supply through discharge diode D3, the normally opened contact of described electric discharge relay K 1 is connected to Ni-MH battery B two ends after being connected in series with the control coil of D.C. contactor K3, the control coil of described electric discharge metal-oxide-semiconductor T1 controlled discharge relay K 1, its grid connects the output port of single-chip microcomputer AT89C2051; The normally opened contact of described D.C. contactor K3 is attempted by discharge diode D3, described charger comprises rectifier bridge ZQ, switch transistor T 3, transformer T, rectifier diode D4 and PWM isolated drive circuit UC3842, after being connected in series, the primary coil of described switch transistor T 3 and transformer T connects the direct voltage of rectifier bridge ZQ output, the input of described PWM isolated drive circuit UC3842 connects the output port of single-chip microcomputer AT89C2051, the grid of its output termination switch transistor T 3, one end of the Voltage Feedback port contact resistance R4 of described PWM isolated drive circuit UC3842; The secondary coil one termination charger output ground of described transformer T, one end connects the common of charge relay K2 through rectifier diode D4, described charge-discharge control circuit is powered by DC/DC accessory power supply, the input of the input termination uninterrupted power supply DC boosting NB of described accessory power supply, on the control coil of described charge relay K2 and electric discharge relay K 1 all and be connected to fly-wheel diode.
Further, in the discharge loop of Ni-MH battery B, be serially connected with fuse FU.
Compared with prior art, the invention has the beneficial effects as follows: the present invention monitors the electric weight of Ni-MH battery B by AT89C2051 single-chip microcomputer, when electric weight lower than rated value is, UC3842 chip switches to Ni-MH battery by charger output, start to charge to Ni-MH battery, thereby guarantee continual charging, after electric weight is full of, UC3842 chip flows through the electric current of resistance R 4 by detection, thereby carry out making conducting narrowed width by UC3842 chip internal current amplifier, output voltage declines, until UC3842 is quit work, there is no trigger impulse output, make field effect transistor cut-off, reach the object of protection power tube, after short circuit phenomenon disappears, power supply recovers normal work automatically.Thereby the accuracy of effectively having controlled the charging of battery, prevents overshoot, the feature that takes full advantage of the overcurrent protection of UC3842 chip strengthens the reliability of this circuit.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, in the embodiment of the present invention, a kind of battery impulse electricity road based on AT89C2051 single-chip microcomputer and UC3842 chip, described circuit comprises charger, discharge diode D3, electric discharge relay K 1, charge-discharge control circuit and resistance R 1～4, described charge-discharge control circuit comprises single chip computer AT 89C2051, charge relay K2 and charging metal-oxide-semiconductor T2, described charger through the normally opened contact of charge relay K2 to Ni-MH battery B charging and connect the input of uninterrupted power supply DC boosting NB through the normally-closed contact of charge relay K2; Described charging metal-oxide-semiconductor T2 controls charge relay K2 control coil, and its grid connects the output port of single-chip microcomputer AT89C2051; Described resistance R 1 and resistance R 2 series connection, resistance R 1 and the resistance R 2 of series connection are in parallel with resistance R 4 again, the output voltage of described Ni-MH battery B connects the voltage sample port of single-chip microcomputer AT89C2051 after resistance R 1 and resistance R 2 dividing potential drops, the 3rd resistance R 3 is serially connected between Ni-MH battery B negative pole and charger output ground, and its output signal connects the current sample port of single-chip microcomputer AT89C2051; Ni-MH battery B is the DC boosting NB power supply to uninterrupted power supply through discharge diode D3.
Further, the normally opened contact of described electric discharge relay K 1 is connected to Ni-MH battery B two ends after being connected in series with the control coil of D.C. contactor K3, the control coil of described electric discharge metal-oxide-semiconductor T1 controlled discharge relay K 1, and its grid connects the output port of single-chip microcomputer AT89C2051; The normally opened contact of described D.C. contactor K3 is attempted by discharge diode D3.
Further, described charger comprises rectifier bridge ZQ, switch transistor T 3, transformer T, rectifier diode D4 and PWM isolated drive circuit UC3842, after being connected in series, the primary coil of described switch transistor T 3 and transformer T connects the direct voltage of rectifier bridge ZQ output, the input of described PWM isolated drive circuit UC3842 connects the output port of single-chip microcomputer AT89C2051, the grid of its output termination switch transistor T 3, one end of the Voltage Feedback port contact resistance R4 of described PWM isolated drive circuit UC3842; The secondary coil one termination charger output ground of described transformer T, one end connects the common of charge relay K2 through rectifier diode D4.
Further, described charge-discharge control circuit is powered by DC/DC accessory power supply, the input of the input termination uninterrupted power supply DC boosting NB of described accessory power supply, on the control coil of described charge relay K2 and electric discharge relay K 1, all and be connected to fly-wheel diode, in the discharge loop of Ni-MH battery B, be serially connected with fuse FU.
When the voltage of Ni-MH battery B is detected when too low, uninterrupted power supply DC boosting NB under-voltage protection, no longer consuming cells electric weight.When interchange input recovers normal, single-chip microcomputer U1 is adjusted into high level by the output signal of its P1.4 port, and this level is delivered 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, D.C. contactor K3 disconnects, when charging for battery, charger provides Hot Spare DC power supply by diode D3 for uninterrupted power supply DC boosting NB, and field effect transistor electric current increases when the electric current overrate of load R4 or short circuit, Voltage Feedback on R4 is to PWM isolated drive circuit UC3842, by PWM isolated drive circuit UC3842 internal current amplifier, make conducting narrowed width, output voltage declines, until UC3842 is quit work, there is no trigger impulse output, make field effect transistor cut-off, reach the object of protection, after short circuit phenomenon disappears, power supply recovers normal work automatically.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and in the situation that not deviating from spirit of the present invention or essential characteristic, can realize the present invention with other concrete form.Therefore, no matter from which point, all should regard embodiment as exemplary, and be nonrestrictive, scope of the present invention is limited by claims rather than above-mentioned explanation, is therefore intended to include in the present invention dropping on the implication that is equal to important document of claim and all changes in scope.Any Reference numeral in claim should be considered as limiting related claim.
In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should make specification as a whole, and the technical scheme in each embodiment also can, through appropriately combined, form other execution modes that it will be appreciated by those skilled in the art that.
Claims (2)
1. the battery impulse electricity road based on AT89C2051 single-chip microcomputer and UC3842 chip, it is characterized in that, described circuit comprises charger, discharge diode D3, electric discharge relay K 1, charge-discharge control circuit and resistance R 1～4, described charge-discharge control circuit comprises single chip computer AT 89C2051, charge relay K2 and charging metal-oxide-semiconductor T2, described charger through the normally opened contact of charge relay K2 to Ni-MH battery B charging and connect the input of uninterrupted power supply DC boosting NB through the normally-closed contact of charge relay K2; Described charging metal-oxide-semiconductor T2 controls charge relay K2 control coil, and its grid connects the output port of single-chip microcomputer AT89C2051; Described resistance R 1 and resistance R 2 series connection, resistance R 1 and the resistance R 2 of series connection are in parallel with resistance R 4 again, the output voltage of described Ni-MH battery B connects the voltage sample port of single-chip microcomputer AT89C2051 after resistance R 1 and resistance R 2 dividing potential drops, the 3rd resistance R 3 is serially connected between Ni-MH battery B negative pole and charger output ground, and its output signal connects the current sample port of single-chip microcomputer AT89C2051; Ni-MH battery B is the DC boosting NB power supply to uninterrupted power supply through discharge diode D3, the normally opened contact of described electric discharge relay K 1 is connected to Ni-MH battery B two ends after being connected in series with the control coil of D.C. contactor K3, the control coil of described electric discharge metal-oxide-semiconductor T1 controlled discharge relay K 1, its grid connects the output port of single-chip microcomputer AT89C2051; The normally opened contact of described D.C. contactor K3 is attempted by discharge diode D3, described charger comprises rectifier bridge ZQ, switch transistor T 3, transformer T, rectifier diode D4 and PWM isolated drive circuit UC3842, after being connected in series, the primary coil of described switch transistor T 3 and transformer T connects the direct voltage of rectifier bridge ZQ output, the input of described PWM isolated drive circuit UC3842 connects the output port of single-chip microcomputer AT89C2051, the grid of its output termination switch transistor T 3, one end of the Voltage Feedback port contact resistance R4 of described PWM isolated drive circuit UC3842; The secondary coil one termination charger output ground of described transformer T, one end connects the common of charge relay K2 through rectifier diode D4, described charge-discharge control circuit is powered by DC/DC accessory power supply, the input of the input termination uninterrupted power supply DC boosting NB of described accessory power supply, on the control coil of described charge relay K2 and electric discharge relay K 1 all and be connected to fly-wheel diode.
2. a kind of battery impulse electricity road based on AT89C2051 single-chip microcomputer and UC3842 chip according to claim 1, is characterized in that, is serially connected with fuse FU in the discharge loop of Ni-MH battery B.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410284358.1A CN104022554A (en) | 2014-06-23 | 2014-06-23 | Battery charging and discharging circuit based on AT89C2051 single chip microcomputer and UC3842 chip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410284358.1A CN104022554A (en) | 2014-06-23 | 2014-06-23 | Battery charging and discharging circuit based on AT89C2051 single chip microcomputer and UC3842 chip |
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| CN201410284358.1A Pending CN104022554A (en) | 2014-06-23 | 2014-06-23 | Battery charging and discharging circuit based on AT89C2051 single chip microcomputer and UC3842 chip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242400A (en) * | 2014-09-29 | 2014-12-24 | 苏州克兰兹电子科技有限公司 | Lithium battery monitoring device |
| CN116366044A (en) * | 2023-03-28 | 2023-06-30 | 重庆大学 | Gate driving circuit for improving overload of power device by adjusting gate voltage |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002095174A (en) * | 2000-09-13 | 2002-03-29 | Casio Comput Co Ltd | Power system and its charging method |
| CN202798049U (en) * | 2012-07-23 | 2013-03-13 | 淄博正大电源有限公司 | Nickel-metal hydride battery charger |
| CN203398833U (en) * | 2013-07-30 | 2014-01-15 | 石家庄国耀电子科技有限公司 | Battery charging/discharging circuit of uninterruptible power supply |
-
2014
- 2014-06-23 CN CN201410284358.1A patent/CN104022554A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002095174A (en) * | 2000-09-13 | 2002-03-29 | Casio Comput Co Ltd | Power system and its charging method |
| CN202798049U (en) * | 2012-07-23 | 2013-03-13 | 淄博正大电源有限公司 | Nickel-metal hydride battery charger |
| CN203398833U (en) * | 2013-07-30 | 2014-01-15 | 石家庄国耀电子科技有限公司 | Battery charging/discharging circuit of uninterruptible power supply |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242400A (en) * | 2014-09-29 | 2014-12-24 | 苏州克兰兹电子科技有限公司 | Lithium battery monitoring device |
| CN116366044A (en) * | 2023-03-28 | 2023-06-30 | 重庆大学 | Gate driving circuit for improving overload of power device by adjusting gate voltage |
| CN116366044B (en) * | 2023-03-28 | 2024-04-30 | 重庆大学 | Gate driving circuit for improving overload of power device by adjusting gate voltage |
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Application publication date: 20140903 |