CN204012674U - A kind of Overdischarge protection device for storage battery - Google Patents
A kind of Overdischarge protection device for storage battery Download PDFInfo
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- CN204012674U CN204012674U CN201420469995.1U CN201420469995U CN204012674U CN 204012674 U CN204012674 U CN 204012674U CN 201420469995 U CN201420469995 U CN 201420469995U CN 204012674 U CN204012674 U CN 204012674U
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- storage battery
- effect transistor
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- optocoupler
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Abstract
A kind of Overdischarge protection device for storage battery, comprising: the source electrode of field effect transistor connects the negative pole of storage battery drain electrode connecting charger and the load of field effect transistor; The connect collector electrode of connecting triode after a current-limiting resistance of the grid of field effect transistor, the collector electrode of triode connects the outlet side of optocoupler; The anode of the input side of optocoupler is connected to the positive pole of storage battery by pull-up resistor, the negative electrode of the input side of optocoupler connects the drain electrode of field effect transistor; The positive-negative input end of differential amplifier is connected with source electrode with the drain electrode of field effect transistor respectively, and the output of differential amplifier is connected with the positive input terminal of voltage comparator; The negative input end of voltage comparator connects the output of voltage stabilizing circuit; The base stage of the output connecting triode of voltage comparator.The anode of optocoupler input side is connected with input signal source by input signal interface.The utility model is effectively avoided life-span, the electric arc of mechanical contact and is subject to the problem of external vibration effects, simple in structure, easy for installation, has improved over performance.
Description
Technical field
The utility model relates to DC UPS technology, particularly relates to a kind of Overdischarge protection device for storage battery.
Background technology
The a lot of directly employing of the accurate power consumption equipment direct current supply that communication equipment etc. are important, its power supply is transformed to stable, clean direct current from AC network and by rectifying power supply apparatus.In order to ensure that main equipment can continuous continual work, the power supply system for communications is parallel with batteries conventionally.In the time that AC network has a power failure, batteries, because adopt type of attachment directly in parallel with rectifier power source and load equipment, can be powered to load equipment immediately, thereby guarantee that load equipment is not affected by external power failure.
But the capacity of batteries is limited, in the time of external power failure overlong time, the electric energy of batteries will exhaust, thereby stops output.In the time that the electric energy of batteries is about to exhaust, its voltage obviously declines, although at this moment can also continue electric discharge, will cause expendable injury to batteries itself.For fear of batteries overdischarge, conventionally need to adopt Overdischarge protection device for storage battery to stop in time storage battery and continue electric discharge.
Overdischarge protection device for storage battery approaches before being discharged and takes measures to disconnect battery discharging circuit at storage battery, stops battery discharging.Traditional way is to realize the cut-out in battery power discharge loop by relay or D.C. contactor.But relay or contactor are all mechanical contacts, and the life-span is limited, and to cut off discharge loop be to there will be larger electric arc, easily causes contact to be damaged, and in order to control larger electric current, its volume, weight are larger.In addition, mechanical contact is subject to external vibration effects.
In prior art, also there is Overdischarge protection device for storage battery, the for example patent No. 201020209243.3, a kind of Overdischarge protection device for storage battery of patent name, the utility model relates to a kind of Overdischarge protection device for storage battery, wherein, ON-OFF control circuit, receive operation signal and send the automatic recovery testing circuit of detection signal and receive the voltage signal of storage battery and send and disconnect control signal and receive described detection signal and send the control circuit of connecting control signal according to described detection signal according to described voltage signal, described ON-OFF control circuit comprises and disconnects with described connection control signal according to described disconnection control signal or connect the first field effect transistor that described storage battery is connected with power supply circuits, the grid of described the first field effect transistor is connected with described control circuit, the source electrode of described the first field effect transistor is connected with described battery terminal negative, the drain electrode of described the first field effect transistor is connected with power supply circuits.But this infrastructure cost is higher, and the structure of recording from the utility model is different.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of Overdischarge protection device for storage battery is provided, and increases the service life, and is convenient to installation and maintenance, has reduced production and use cost.
In order to achieve the above object, the technical solution adopted in the utility model is:
A kind of Overdischarge protection device for storage battery, comprises field effect transistor, current-limiting resistance, optocoupler, triode, pull-up resistor, differential amplifier, voltage comparator, voltage stabilizing circuit and storage battery;
The source electrode of field effect transistor connects the negative pole of storage battery, and drain electrode connecting charger and the load of field effect transistor form major loop, i.e. the main power circuit of load;
The connect collector electrode of connecting triode after a current-limiting resistance of the grid of field effect transistor, the collector electrode of triode connects the outlet side of optocoupler, forms drive circuit;
The anode of the input side of optocoupler is connected to the positive pole of storage battery by pull-up resistor, the negative electrode of the input side of optocoupler connects the drain electrode of field effect transistor;
The positive-negative input end of differential amplifier is connected with source electrode with the drain electrode of field effect transistor respectively, and the output of differential amplifier is connected with the positive input terminal of voltage comparator; The negative input end of voltage comparator connects the output of voltage stabilizing circuit; The base stage of the output connecting triode of voltage comparator, forms short-circuit protection circuit.
Preferably, the anode of described optocoupler input side is connected with input signal source by input signal interface, for controlling the grid voltage of field effect transistor.
Preferably, described input signal source is connected with charger, is powered by charger.
Preferably, described input signal is pulldown signal.
Preferably, described input signal source is made up of control circuit, and described control circuit is CPU or Master control chip.
Preferably, described optocoupler, differential amplifier, voltage comparator are connected with voltage stabilizing circuit, are powered by voltage stabilizing circuit, and voltage stabilizing circuit is connected with storage battery, by storage battery power supply.
Preferably, the supplying resistance of connecting between described voltage stabilizing circuit and optocoupler outlet side.
Preferably, on the shell of described field effect transistor, a radiator is set.
Preferably, described field effect transistor is reinforced insulation grid type N channel field-effect pipe.
Preferably, described voltage stabilizing circuit by source of stable pressure as voltage stabilizing didoe or like and EMC the electric circuit constitute.
Compared with prior art, the beneficial effects of the utility model are: replace traditional relay or contactor by field effect transistor, can effectively avoid life-span, the electric arc of mechanical contact and be subject to the problem of external vibration effects; Whole device volume and weight are less, install simple and conveniently, have saved cost; In addition, adding of radiator improved surge withstand resistance, and overload, short-circuit protection circuit have further improved the reliability of device.
Brief description of the drawings
Fig. 1 is apparatus structure schematic diagram of the present utility model.
Embodiment
Purport of the present utility model is to overcome the deficiencies in the prior art; a kind of Overdischarge protection device for storage battery for the power supply system for communications and similar DC UPS system is provided; comprise reinforced metal oxide field-effect transistor and the driving/control circuit thereof of some parallel connections; all components and parts of the present utility model can be arranged in a printed circuit board; described device is series in the accumulator cell charging and discharging loop of DC power system, and the main control module that has interface to be connected to power-supply system is accepted its control signal and control the break-make in storage battery loop.The utility model is controlled storage battery loop by field effect pipe belt for traditional D.C. contactor or relay, has overcome the shortcoming that the mechanical contact life-span is short, have electric arc, anti-vibration ability, has reduced production cost simultaneously.
Be elaborated with reference to accompanying drawing below in conjunction with embodiment, to technical characterictic of the present utility model and advantage are interpretated more in-depth.
Apparatus structure schematic diagram of the present utility model as shown in Figure 1; a kind of Overdischarge protection device for storage battery, comprises field effect transistor 1, current-limiting resistance 2, optocoupler 3, triode 4, pull-up resistor 5, differential amplifier 6, voltage comparator 7, voltage stabilizing circuit 9 and storage battery 10.
Overdischarge protection device for storage battery described in the utility model mainly comprises major loop, drive circuit, input signal control circuit, the overload short circuit protective circuit in over loop.Certainly; as required; Overdischarge protection device for storage battery described in the utility model, for the power supply system for communications and similar DC UPS system, can arrange the reinforced metal oxide field-effect transistor and the driving/control circuit thereof that comprise some parallel connections as required.
Over major loop described in the utility model is: the source electrode of field effect transistor 1 connects the negative pole of storage battery 10, drain electrode connecting charger and the load of field effect transistor 1.As shown in Figure 1; field effect transistor 1 is connected on the negative pole of the storage battery 10 in DC power system accumulator cell charging and discharging loop; the drain electrode of field effect transistor 1 is connecting charger and load respectively, and the source electrode of field effect transistor 1 connects the negative pole of storage battery 10, forms the major loop in battery overdischarge protection loop.Drive circuit described in the utility model is: the connect collector electrode of the rear connecting triode 4 of a current-limiting resistance 2 of the grid of field effect transistor 1, the collector electrode of triode 4 connects the outlet side of optocoupler 3, forms drive circuit.
The anode of optocoupler 3 input sides is connected to the positive pole of storage battery 10 by pull-up resistor 5, the negative electrode of the input side of optocoupler 3 connects the drain electrode of field effect transistor 1.
Overload short circuit protective circuit of the present utility model is: the positive-negative input end of differential amplifier 6 is connected with source electrode with the drain electrode of field effect transistor 1 respectively, and the output of differential amplifier 6 is connected with the positive input terminal of voltage comparator 7; The negative input end of voltage comparator 7 connects the output of voltage stabilizing circuit 9; The base stage of the output connecting triode 4 of voltage comparator 7, forms short-circuit protection circuit.And the utility model has added overload, short-circuit protection circuit, can effectively prevent that field effect transistor from being damaged by excessive discharging current, further improve the overload short circuit protective capability of device, improve security performance.
Field effect transistor and short-circuit protection circuit are powered by voltage stabilizing circuit by storage battery, but the remote signal of input is powered by charger.As shown in Figure 1, described optocoupler 3, differential amplifier 6, voltage comparator 7 are connected with voltage stabilizing circuit 9, are powered respectively by voltage stabilizing circuit 9; And voltage stabilizing circuit 9 is connected with storage battery 10, powered by storage battery 10, realize the normal operation of whole device.The supplying resistance 8 of connecting between described voltage stabilizing circuit 9 and optocoupler 3 outlet sides.Described voltage stabilizing circuit 9 is made up of source of stable pressure, in the utility model, in order to reach good effect, voltage stabilizing circuit 9 should have enough antijamming capabilities, for good antijamming capability is set, except source of stable pressure, EMC circuit can also be set in voltage stabilizing circuit 9, source of stable pressure forms voltage stabilizing circuit 9 together with EMC circuit, source of stable pressure and EMC circuit are all ripe prior aries, and EMC circuit can prevent that voltage stabilizing circuit 9 is subject to the space radiation of environment preferably, the interference of strong static and highfield etc. and occur that abnormal output causes the phenomenon of the abnormal break-make in battery discharging loop.Meanwhile, in the time that storage battery 10 voltages occur unusual fluctuations as short circuit, can effectively prevent that permanent fault from appearring in voltage stabilizing circuit 9, can effectively prevent that misoperation from appearring in field effect transistor 1 simultaneously.In line component layout, optocoupler 3, differential amplifier 6, voltage comparator 7, storage battery 10, voltage stabilizing circuit 9 keep rational space length with field effect transistor 1, avoid causing electric property abnormal because of the temperature rise of field effect transistor 1.Voltage stabilizing circuit 9 should power consumption arrange enough little, general by being controlled in the 200ppm of main circuit rated current.As while selecting battery discharging loop rated current to be 30A, the operating current of stabilized voltage power supply should be less than 6mA, at this moment stabilized voltage power supply can select common linear stabilized power supply to meet the demands; If use little storage battery, can consider that DC/DC control chip TI LM2593HV with low-power consumption etc. meets the demands.Power consumption arranges and after enough little in order to avoid battery discharge loop cuts off, still continues consuming cells electric energy and cause battery over-discharge.
As embodiment of the present utility model, a radiator is set on the shell of described field effect transistor 1.By radiator is set, can improve preferably field effect transistor 1 antisurge ability.It should be noted that especially the selected field effect transistor of the utility model is reinforced insulation grid type N channel field-effect pipe, and there is higher through-current capability and extremely low conducting resistance, guarantee that conducting resistance is controlled in tens of milliohms.The utility model, had both overcome short, arcing of life-span and had been subject to the shortcoming of vibration influence for relay or contactor by field effect pipe belt, can reduce costs to a certain extent again, and it is also more convenient to install.Certainly, the utility model is not limited to reinforced insulation grid type N channel field-effect pipe, and any other field effect transistor that can realize identical function all should be in protection range of the present utility model.
As shown in Figure 1, in input signal control circuit, the anode of described optocoupler 3 input sides is connected with input signal source by input signal interface, for controlling the grid voltage of field effect transistor 1.Introduce the grid voltage of control signal for the field effect transistor 1 controlled by input signal i port, reach the object of controlling field effect transistor 1 break-make.Described input signal source is connected with charger, is powered by charger.Described input signal i is pulldown signal.Further, described input signal source is made up of control circuit.For example, the break-make in storage battery loop accepted its control signal and controls by the control circuit that input signal source of the present utility model can be connected to power-supply system by interface.Such as control circuit can be CPU or Master control chip etc.
By the technical scheme in above embodiment, the utility model is carried out to clear, complete description, obvious described embodiment is the embodiment of the utility model part, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Claims (9)
1. an Overdischarge protection device for storage battery, is characterized in that:
Comprise field effect transistor (1), current-limiting resistance (2), optocoupler (3), triode (4), pull-up resistor (5), differential amplifier (6), voltage comparator (7), voltage stabilizing circuit (9) and storage battery (10);
The source electrode of field effect transistor (1) connects the negative pole of storage battery (10), and drain electrode connecting charger and the load of field effect transistor (1) form major loop;
The connect collector electrode of connecting triode (4) after a current-limiting resistance (2) of the grid of field effect transistor (1), the collector electrode of triode (4) connects the outlet side of optocoupler (3), forms drive circuit;
The anode of the input side of optocoupler (3) is connected to the positive pole of storage battery (10) by pull-up resistor (5), the negative electrode of the input side of optocoupler (3) connects the drain electrode of field effect transistor (1);
The positive-negative input end of differential amplifier (6) is connected with source electrode with the drain electrode of field effect transistor (1) respectively, and the output of differential amplifier (6) is connected with the positive input terminal of voltage comparator (7); The negative input end of voltage comparator (7) connects the output of voltage stabilizing circuit (9); The base stage of the output connecting triode (4) of voltage comparator (7), forms short-circuit protection circuit.
2. Overdischarge protection device for storage battery according to claim 1, is characterized in that: the anode of described optocoupler (3) input side is connected with input signal source by input signal interface, for controlling the grid voltage of field effect transistor (1).
3. Overdischarge protection device for storage battery according to claim 2, is characterized in that: described input signal source is connected with charger, is powered by charger.
4. Overdischarge protection device for storage battery according to claim 2, is characterized in that: described input signal is pulldown signal.
5. Overdischarge protection device for storage battery according to claim 2, is characterized in that: described input signal source is made up of control circuit, and described control circuit is CPU or Master control chip.
6. Overdischarge protection device for storage battery according to claim 1; it is characterized in that: described optocoupler (3), differential amplifier (6), voltage comparator (7) are connected with voltage stabilizing circuit (9); powered by voltage stabilizing circuit (9); voltage stabilizing circuit (9) is connected with storage battery (10), is powered by storage battery (10).
7. Overdischarge protection device for storage battery according to claim 6, is characterized in that: the supplying resistance (8) of connecting between described voltage stabilizing circuit (9) and optocoupler (3) outlet side.
8. Overdischarge protection device for storage battery according to claim 1, is characterized in that: on the shell of described field effect transistor (1), a radiator is set.
9. Overdischarge protection device for storage battery according to claim 1, is characterized in that: described field effect transistor (1) is reinforced insulation grid type N channel field-effect pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420469995.1U CN204012674U (en) | 2014-08-20 | 2014-08-20 | A kind of Overdischarge protection device for storage battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420469995.1U CN204012674U (en) | 2014-08-20 | 2014-08-20 | A kind of Overdischarge protection device for storage battery |
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| CN204012674U true CN204012674U (en) | 2014-12-10 |
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| CN201420469995.1U Active CN204012674U (en) | 2014-08-20 | 2014-08-20 | A kind of Overdischarge protection device for storage battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300279A (en) * | 2015-05-12 | 2017-01-04 | 高达能源科技股份有限公司 | Forced charge protection circuit after secondary cell overdischarge |
-
2014
- 2014-08-20 CN CN201420469995.1U patent/CN204012674U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300279A (en) * | 2015-05-12 | 2017-01-04 | 高达能源科技股份有限公司 | Forced charge protection circuit after secondary cell overdischarge |
| CN106300279B (en) * | 2015-05-12 | 2018-09-18 | 高达能源科技股份有限公司 | Circuit is protected for the forced charge after secondary cell overdischarge |
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