CN101814726B - Battery discharge prevention circuit - Google Patents
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- CN101814726B CN101814726B CN2010101473714A CN201010147371A CN101814726B CN 101814726 B CN101814726 B CN 101814726B CN 2010101473714 A CN2010101473714 A CN 2010101473714A CN 201010147371 A CN201010147371 A CN 201010147371A CN 101814726 B CN101814726 B CN 101814726B
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Abstract
The invention relates to a self-locking battery discharge prevention circuit which comprises a reference circuit, an undervoltage detection circuit, a charging detection circuit, a protection self-locking circuit and a protection output circuit. The undervoltage detection circuit detects the low voltage of a battery, outputs an undervoltage signal of the battery and triggers the protection self-locking circuit to form self-locking and control the protection output circuit to switch output off. When the battery is charged, and the charging detection circuit detects an output charging signal and triggers the protection self-locking circuit to unlock and control the protection output circuit to switch output on. Due to the use of an accurate constant pressure source, the self-locking battery discharge prevention circuit can realize accurate undervoltage detection, immediately triggers a self-locking circuit and switches a load-discharging loop off when detecting the undervoltage battery. The self-locking circuit can be unlocked only after the battery is charged by the circuit. Accordingly, the circuit takes the extremely reliable protection for the excessive discharge of the battery.
Description
Technical field
The present invention relates to DC power supply protective circuit field, particularly online back-up source can self-locking battery discharge prevention circuit.
Background technology
The repeated charge technology of battery advances all the time, and the technology that discharges and recharges that particularly non-maintaining formula plumbic acid cuts down the formula battery constantly improves especially.Since non-maintaining formula plumbic acid cut down the formula battery have capacity big, can hold that density height, manufacture difficulty are little, low price, dimensions is unified and the advantage that need not maintain, therefore is widely used in the back-up source of various device as energy storage device.Yet there are many shortcomings again in lead-acid battery itself, and along with the increase of access times and service time, the internal resistance that constantly descends of the capacity of battery increases.Especially the overdischarge of lead-acid battery will cause battery capacity sharply to descend to shorten useful life, even causes battery to damage.Therefore the discharge to lead-acid battery is necessary to protect, and the lead-acid battery in the particularly online back-up source need be protected discharge especially.
Common discharge protection circuit is that the voltage to battery detects in real time, when detecting when being lower than setting voltage, just turn-offs the discharge loop of battery.Sort circuit is can the discharge of battery be played a protective role in theory, but in fact really not so.Because turn-offed the discharge loop of battery, cell voltage can go up a bit again, and surpass the voltage of setting; Thereby discharge loop is connected again, after the connection, can be occurred cell voltage again and be lower than setting voltage; Turn-off the discharge loop of battery again, cell voltage gos up again, and discharge loop is connected again; Be lower than setting voltage when so repeatedly, finally making cell voltage unloaded and overdischarge occurs.Though this overdischarge can not cause battery to damage, but can accelerate battery capacity decrease speed, reduction of service life.Especially when protection occurring because connect times without number, the discharge loop of disconnecting consumers, will cause very big impact to load equipment, even damage load equipment.Also there are many circuit to adopt the battery management integrated circuit to make the battery management system circuit, though can play good protection to battery, its complicated circuit, the loaded down with trivial details and mutual overlapping of function, cost is also higher, and the waste rate is also high.
Summary of the invention
The present invention addresses the above problem the battery discharge prevention circuit that the self-locking of a kind of ability is provided; Circuit just triggers latching circuit when under-voltage at once detecting battery; And the switching off load discharge loop, and only after battery being charged, just can solve the self-locking of circuit through this circuit.Therefore, this circuit has played very reliable protection to the over-discharge can of battery, and circuit is simple, and is with low cost.
In order to achieve the above object, the present invention has adopted following technical scheme:
A kind of battery discharge prevention circuit; Can make accurate judgement to battery is under-voltage; And locking is closed electric; And can only could open electric through battery is charged, form by reference circuit, undervoltage detection circuit, charging testing circuit, protection latching circuit, five parts of protection output circuit; The power supply of said battery discharge prevention circuit is provided by battery or voltage conversion device; When the power supply of battery discharge prevention circuit is provided by battery; Battery is directly connected to the feeder ear of battery discharge prevention circuit it is supplied power; Anode is received the power supply positive terminal, and GND is received the power supply negative pole end as a reference; Undervoltage detection circuit detects battery low pressure output battery under-voltage signal; The trigger protection latching circuit forms from lock control protection output circuit and turn-offs output; When battery is charged; The charging testing circuit detects output charging signals trigger protection latching circuit and separates lock control protection output circuit unlatching output, is embodied in:
Said reference circuit is made up of adjustable voltage stabilizing didoe, first electric capacity and first resistance; The anode of adjustable voltage stabilizing didoe connects with reference to ground; Negative electrode is received positive source through first resistance and is constituted parallel reference voltage-stabilizing circuit; Export a reference voltage accurately from the negative electrode of adjustable voltage stabilizing didoe; First electric capacity is parallel on the negative electrode and anode of adjustable voltage stabilizing didoe, plays the effect of anti-interference filtration and decoupling, and the adjustment end of adjustable voltage stabilizing didoe comes reference voltage is finely tuned through outer meeting resistance network or adjustable resistance network;
Said undervoltage detection circuit is made up of one tunnel first integrated operational amplifier, second resistance, the 3rd resistance and second electric capacity; Second resistance and the 3rd resistance string are linked to carries out dividing potential drop to cell voltage on the battery and obtains sampling voltage; Dividing point is received an input of first integrated operational amplifier; The reference voltage of sampling voltage and first another input of integrated operational amplifier compares; By the output of first integrated operational amplifier output sampling result is under-voltage signal, accomplishes the sampling to cell voltage, at the sampling input of first integrated operational amplifier to playing the anti-interference filtration effect with reference to the ground and second electric capacity that connects;
Said charging testing circuit is made up of one tunnel second integrated operational amplifier, power diode, first current-limiting resistance and light-emitting diode; The positive terminal that charge power supply inserts directly is connected with anode; Power diode is connected in the battery charge loop; Anode is connected with GND, and negative electrode is received the negative pole end that charge power supply inserts, and the bipod of power diode is connected to two inputs of second integrated operational amplifier simultaneously; When battery is charged; The positive bias-voltage of power diode forms relatively at two inputs of second integrated operational amplifier, and exporting comparative result by the output of second integrated operational amplifier is charging signals, accomplishes the detection of charged state; First current-limiting resistance and light-emitting diode positively biased are connected in series to the charge power supply incoming end and play the charging indicative function, are again that second integrated operational amplifier provides the upset bias voltage when not charging;
Described protection latching circuit is made up of one tunnel the 3rd integrated operational amplifier, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 3rd electric capacity and the 4th electric capacity; Two inputs of the 3rd integrated operational amplifier are received reference voltage by the 4th resistance and the 5th resistance respectively reference offset are provided; The 6th resistance is received normal phase input end from the output of the 3rd integrated operational amplifier and is formed the positive feedback self-locking structure; The 7th resistance is received the power supply positive terminal by the output of the 3rd integrated operational amplifier and is formed to export and draw; Two inputs of the 3rd integrated operational amplifier insert under-voltage signal and charging signals respectively; When undervoltage detection circuit is exported under-voltage signal, the protection latching circuit just is triggered and locks the output result be guard mode, when the testing circuit that charges detects charging signals; The protection latching circuit is triggered again and locks the output result for opening output state; By the output output lock-out state signal of the 3rd integrated operational amplifier, the 3rd electric capacity and the 4th electric capacity are received with reference to ground by two inputs of the 3rd integrated operational amplifier respectively, and the triggering signal of input is carried out anti-interference filtration; Simultaneously also be that the initial condition locking is provided with element, the initial condition of circuit locking is by the initial charge speed decision of the 3rd electric capacity and the 4th electric capacity;
Said protection output circuit; Form by one tunnel the 4th integrated operational amplifier, positive-negative-positive triode, the 8th resistance, second current-limiting resistance and a diode; Input of the 4th integrated operational amplifier is directly connected to reference voltage provides reference offset, and another input inserts the lock-out state signal through one the 8th resistance, inserts charging signals through diode simultaneously and forms logical AND or logic OR structure; The output result of common control the 4th integrated operational amplifier output is the load switch control signal; When the charging testing circuit detects charging signals, its output is the result just be changed to and close load condition, when the charging testing circuit does not detect charging signals; The result is by the lock-out state signal deciding in its output; The lock-out state signal is when opening output state, and its output result is unlatching electric state, when the lock-out state signal is guard mode; The result is for closing load condition in its output; Whether the output of the 4th integrated operational amplifier is received the base stage of positive-negative-positive triode through second current-limiting resistance, controlled electric with the power supply positive terminal with reference to ground external load power switch control device together by the emitter and collector of PNP triode, and external electric switch controlling device is selected from pliotron, power field effect pipe or relay circuit structure.
Said reference circuit also can be made up of external direct current regulation circuit structure, and external direct current regulation circuit structure is selected from Zener diode, integrated regulator and transistor stabilized circuit structure.
Described protection output circuit; Can also form by one tunnel the 4th integrated operational amplifier, positive-negative-positive triode, the 8th resistance and second current-limiting resistance; Input of the 4th integrated operational amplifier is directly connected to reference voltage provides reference offset; Another input is the load switch control signal through the output result that one the 8th resistance inserts lock-out state signal controlling the 4th integrated operational amplifier output; When the lock-out state signal was the unlatching output state, the result was for opening the electric state, when the lock-out state signal is guard mode in its output; The result is for closing load condition in its output; Whether the output of the 4th integrated operational amplifier is received the base stage of positive-negative-positive triode through second current-limiting resistance, controlled electric with the power supply positive terminal with reference to ground external load power switch control device together by the emitter and collector of PNP triode, and external electric switch controlling device is selected from pliotron, power field effect pipe or relay circuit structure.
Said protection output circuit; Also can form by one tunnel the 4th integrated operational amplifier, the 8th resistance and a diode; Input of the 4th integrated operational amplifier is directly connected to reference voltage provides reference offset; Another input inserts the lock-out state signal through one the 8th resistance, inserts charging signals through diode simultaneously and forms logical AND or logic OR structure, and the output result who controls the 4th integrated operational amplifier output jointly is the load switch control signal; When the charging testing circuit detects charging signals; Its output result just is changed to and closes load condition, and when the charging testing circuit did not detect charging signals, the result was by the lock-out state signal deciding in its output; The lock-out state signal is when opening output state; Its output result is for opening the electric state, and when the lock-out state signal was guard mode, the result was for closing load condition in its output; Whether the output of the 4th integrated operational amplifier is controlled electric with the power supply positive terminal with reference to ground external load power switch control device together, and external electric switch controlling device is selected from the power switch circuit structure of triode, optocoupler, FET and pliotron, power field effect pipe or relay formation.
Optimum; The positive supply pin of described first integrated operational amplifier, second integrated operational amplifier, the 3rd integrated operational amplifier and the 4th integrated operational amplifier is all directly received the power supply positive terminal; The negative supply pin is all directly received the power supply negative pole end, and between first integrated operational amplifier, second integrated operational amplifier, the 3rd integrated operational amplifier and the positive and negative power pins of the 4th integrated operational amplifier all and be connected to an electric capacity that power supply is carried out the filtering decoupling.
Beneficial effect of the present invention is following:
The present invention provides a kind of battery discharge prevention circuit with auto-lock function, and therefore this circuit can realize accurate under-voltage detection owing to used accurate constant pressure source; Circuit just triggers latching circuit and switching off load discharge loop when under-voltage at once detecting battery.And only after battery being charged, just can solve the self-locking of circuit through this circuit; Therefore, this circuit has played very reliable protection to the over-discharge can of battery.
Description of drawings
The battery discharge prevention circuit schematic diagram that Fig. 1 constitutes based on LM339 with auto-lock function.
Fine setting Driven MOSFET that Fig. 2 band is under-voltage-N turn-offs the battery discharge prevention circuit schematic diagram of negative pole.
Embodiment
The battery discharge prevention circuit of ability self-locking as shown in Figure 1 is made up of reference voltage circuit, undervoltage detection circuit, charging testing circuit, protection latching circuit, five parts of protection output circuit.Battery discharge prevention circuit that can self-locking directly provides power supply by battery, and the positive pole of battery is connected to the positive source feeder ear of this circuit, and the negative pole of battery is connected to the power cathode feeder ear of this circuit and as a reference.C1 is the bypass of the comparator U2 power filtering capacitor of holding concurrently in this circuit, directly is attempted by on U1_3 and the U1_12 pin.
Reference voltage circuit is made up of the U2 among Fig. 1, R8 and C5.U2 is an adjustable voltage stabilizing didoe, and R8 is a current-limiting resistance; The adjustment pin of U2 is directly drawn as reference voltage fine setting port.C5 is used for the anti-interference filtration of reference voltage source, reduces the internal resistance of reference voltage source simultaneously.Cell voltage forms U2 to be similar to the avalanche breakdown effect of Zener diode through R8, presses by obtaining a constant DC after the R8 dividing potential drop, thereby obtains the reference voltage source of this circuit.
Undervoltage detection circuit is made up of first group of comparator U1A of the R1 among Fig. 1, R2, C2 and U1.Cell voltage obtains sampling voltage through R1, the step-down of R2 series connection ratio, receives U1_5 through the C2 anti-interference filtration, compares with the reference voltage formation of U1_4; When cell voltage was lower than set point, it was under-voltage signal that U1_2 just exports a low level, thus trigger protection latching circuit locking switching off load loop.Do not detecting battery when under-voltage, U1_2 exports high-impedance state, therefore can not produce any influence to the protection latching circuit, and the protection latching circuit is still kept original state.
The charging testing circuit is made up of the 4th group of comparator U1D of R0, LED, D1 and U1 among Fig. 1.Wherein D1 is the charging detecting element, is again the charge protection element, can prevent effectively that charging wire from connecing to cause battery to damage on the contrary.When being used to charge, turn-offs D2 the cell load loop.R0, LED are charging indications, also are simultaneously the upset biasing circuits of charging testing circuit.When through the external charge device battery being charged, LED lights the indication charging through R0 positively biased, and D1 positively biased is charging signals from low level of U1_13 output in U1_10, the last formation of U1_11 relatively, goes the release of trigger protection latching circuit.When battery not being charged, though, do not have loop current because LED is in positively biased; So can not light, can only let D1 constitute reverse bias voltage, and make U1_13 output high-impedance state; Therefore can not produce any influence to the protection latching circuit, the protection latching circuit is still kept original state.
The protection latching circuit is made up of second group of comparator U1B of R3, R4, R5, R6, C3, C4 and U1.R3, R4 constitute the reference offset of latching circuit.R5 constitutes degree of depth positive feedback in circuit, realize the self-locking of circuit.R6 is the pull-up resistor of latching circuit output.The effect of C3, C4 is that triggering signal is carried out anti-interference filtration, increases the stability of circuit, also is simultaneously that the initial condition locking is provided with element.The initial state of this circuit is designed to locking and closes output.When connecting battery for this circuit; Owing to design the charging rate of C3 more slowly than the charging rate of C4, so being lower than the voltage of U_16 inverting input relatively, the voltage of U_17 normal phase input end forms anti-comparison partially, make the U1_1 output low level; Promptly exporting the result is guard mode; Feed back to U1_7 through R5, U1_7 voltage is limited in reference voltage through R3 and R5 voltage after partial value, and U1_6 voltage then maintains reference voltage value; Therefore U1B's instead partially relatively is locked; U1_1 output also just is locked into low level, and the initial state of lock-out state signal is locked into guard mode, thereby having avoided depositing for a long time battery electric quantity to be exhausted do not have electricity because of product deposits the harm to battery.
In Fig. 1, when being locked as, the circuit initial state closes when output, and we just must export the connection load circuit to opening after the battery charge.When battery is charged; The low level of U1_13 output is that charging signals drags down U1_6, and U1B constitutes positively biased relatively, U1_1 output become high-impedance state; By drawing the lock-out state signal of promptly exporting the result for high level on the R6 is to open output state; And U1_7 voltage also by reference voltage through R3 and R5 voltage after partial value become reference voltage add anode to reference voltage through R6, R5, the R3 partial pressure value on R3, promptly the voltage on the U1_7 is maintained at greater than reference voltage value, when having a power failure or break off charger; U1_13 output transfers high-impedance state to; U1_6 returns to reference voltage value, and U1B still keeps the positively biased comparative result, thereby the lock-out state signal is locked into the unlatching output state.When battery battery occurs when under-voltage because of discharge; The low level of U1_2 output is that under-voltage signal drags down U1_7; Form anti-relatively inclined to one side with U1_6; U1_1 output becomes low level by high-impedance state, and the lock-out state signal becomes guard mode, goes to turn-off the power supply to load by protection output circuit control load switch.After load is disconnected; Cell voltage gos up, and U1_13 output changes into high-impedance state, and battery under-voltage signal disappears; The voltage of U1_17 is locked into R5 through the partial pressure value of R3 to reference voltage because of the positive feedback of R5; The anti-comparative result partially of U1B is locked, and U1_1 output also just is locked into low level, and the lock-out state signal is locked into guard mode.
The protection output circuit is made up of the 3rd group of comparator U1C of the R7 among Fig. 1, R9, Q1, D2 and U1.Charging signals is isolated in U1_8 formation logical AND through isolation of R7 current limliting and lock-out state signal through the D2 clamper; The logic level of common control U1_8, when the U1_13 output low level promptly detected charging signals, U1_8 is dragged down was the electronegative potential near 0V; Constitute positively biased relatively with the reference voltage of U1_9; Make U1_14 output high-impedance state, Q1 loses bias current and does not work, and circuit turn-offs the output of this circuit.When U1_13 is a high-impedance state when promptly not detecting charging signals, the voltage of U1_8 is by the lock-out state signal deciding, when the lock-out state signal is that U1_1 is when being high-impedance state for opening output state; U1_8 through R6, R7 by on draw and be high potential near cell voltage; Constitute with the reference voltage of U1_9 and instead partially relatively to make U1_14 form conducting state over the ground, make Q1 obtain forward current and the output of opening this circuit through R9; When the lock-out state signal is that guard mode is that U1_1 is when being low level; U1_8 is dragged down to constituting positively biased relatively near the electronegative potential of 0V and the reference voltage of U1_9, makes U1_14 output high-impedance state; Q1 loses bias current and does not work, and circuit turn-offs the output of this circuit.
The circuit of Fig. 1 relatively is fit to the batteries of 3～24V is carried out discharge prevention; Be particularly suitable for the batteries of 6～18V; For not in the battery pack of said scope, must come this circuit supply through voltage conversion circuit, the input of change-over circuit is received on the battery; Output is received the feeder ear of this circuit, but the method that connects of testing circuit remains unchanged.When the reference voltage of this circuit is provided by other form, as come from the reference voltage of other circuit and the voltage stabilizing circuit of other form, just do not need the reference circuit part in this circuit, external reference voltage directly to receive the reference voltage point of this circuit.For the equipment of built-in rechargable power supplies, in Fig. 1, control the break-make of power supply through external two buttons, be connected to respectively U1_6 to ground the control power connection, U1_7 is the control power remove to ground.When charging need not the disconnecting consumers power supply equipment, D2 does not just insert this circuit.
The circuit of Fig. 2 is the practical application circuit that the present invention is applied to Driven MOSFET-N switching off load negative pole; Be adapted to the discharge prevention of the batteries of 6～18V; As shown in Figure 2, the switch drive among Fig. 11 is received the power supply positive pole, switch drive 2 is received the power supply negative pole through a resistance R 10; And the grid of receiving MOSFET-N from switch drive 2 goes to control the power supply of MOSFET-N switching load, has realized the reliably protecting to battery over-discharge.The source electrode of MOSFET-N is received GND, and the drain electrode of MOSFET-N is as the load negative pole, and anode is anodal as load.
Among Fig. 2, adjust reference voltage, realize setting among a small circle batteries over threshold values through the adjustable resistance network of promptly supply power at reference voltage point, benchmark fine setting end and GND external adjustable resistance RP1 of negative pole end and resistance R 11.
Claims (5)
1. battery discharge prevention circuit; Can make accurate judgement to battery is under-voltage; And locking is closed electric; And can only could open electric through battery is charged, form by reference circuit, undervoltage detection circuit, charging testing circuit, protection latching circuit, five parts of protection output circuit; The power supply of said battery discharge prevention circuit is provided by battery or voltage conversion device; When the power supply of battery discharge prevention circuit is provided by battery; Battery is directly connected to the feeder ear of battery discharge prevention circuit it is supplied power; Anode is received the power supply positive terminal, and GND is received the power supply negative pole end as a reference; Undervoltage detection circuit detects battery low pressure output battery under-voltage signal; The trigger protection latching circuit forms from lock control protection output circuit and turn-offs output; When battery is charged; The charging testing circuit detects output charging signals trigger protection latching circuit and separates lock control protection output circuit unlatching output, it is characterized in that:
Said reference circuit is made up of adjustable voltage stabilizing didoe, first electric capacity and first resistance; The anode of adjustable voltage stabilizing didoe connects with reference to ground; Negative electrode is received positive source through first resistance and is constituted parallel reference voltage-stabilizing circuit; Export a reference voltage accurately from the negative electrode of adjustable voltage stabilizing didoe; First electric capacity is parallel on the negative electrode and anode of adjustable voltage stabilizing didoe, plays the effect of anti-interference filtration and decoupling, and the adjustment end of adjustable voltage stabilizing didoe comes reference voltage is finely tuned through outer meeting resistance network or adjustable resistance network;
Said undervoltage detection circuit is made up of one tunnel first integrated operational amplifier, second resistance, the 3rd resistance and second electric capacity; Second resistance and the 3rd resistance string are linked to carries out dividing potential drop to cell voltage on the battery and obtains sampling voltage; Dividing point is received an input of first integrated operational amplifier; The reference voltage of sampling voltage and first another input of integrated operational amplifier compares; By the output of first integrated operational amplifier output sampling result is under-voltage signal, accomplishes the sampling to cell voltage, at the sampling input of first integrated operational amplifier to playing the anti-interference filtration effect with reference to the ground and second electric capacity that connects;
Said charging testing circuit is made up of one tunnel second integrated operational amplifier, power diode, first current-limiting resistance and light-emitting diode; The positive terminal that charge power supply inserts directly is connected with anode; Power diode is connected in the battery charge loop; Anode is connected with GND, and negative electrode is received the negative pole end that charge power supply inserts, and the bipod of power diode is connected to two inputs of second integrated operational amplifier simultaneously; When battery is charged; The positive bias-voltage of power diode forms relatively at two inputs of second integrated operational amplifier, and exporting comparative result by the output of second integrated operational amplifier is charging signals, accomplishes the detection of charged state; First current-limiting resistance and light-emitting diode positively biased are connected in series to the charge power supply incoming end and play the charging indicative function, are again that second integrated operational amplifier provides the upset bias voltage when not charging;
Described protection latching circuit is made up of one tunnel the 3rd integrated operational amplifier, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 3rd electric capacity and the 4th electric capacity; Two inputs of the 3rd integrated operational amplifier are received reference voltage by the 4th resistance and the 5th resistance respectively reference offset are provided; The 6th resistance is received normal phase input end from the output of the 3rd integrated operational amplifier and is formed the positive feedback self-locking structure; The 7th resistance is received the power supply positive terminal by the output of the 3rd integrated operational amplifier and is formed to export and draw; Two inputs of the 3rd integrated operational amplifier insert under-voltage signal and charging signals respectively; When undervoltage detection circuit is exported under-voltage signal, the protection latching circuit just is triggered and locks the output result be guard mode, when the testing circuit that charges detects charging signals; The protection latching circuit is triggered again and locks the output result for opening output state; By the output output lock-out state signal of the 3rd integrated operational amplifier, the 3rd electric capacity and the 4th electric capacity are received with reference to ground by two inputs of the 3rd integrated operational amplifier respectively, and the triggering signal of input is carried out anti-interference filtration; Simultaneously also be that the initial condition locking is provided with element, the initial condition of circuit locking is by the initial charge speed decision of the 3rd electric capacity and the 4th electric capacity;
Said protection output circuit; Form by one tunnel the 4th integrated operational amplifier, positive-negative-positive triode, the 8th resistance, second current-limiting resistance and a diode; Input of the 4th integrated operational amplifier is directly connected to reference voltage provides reference offset, and another input inserts the lock-out state signal through one the 8th resistance, inserts charging signals through diode simultaneously and forms logical AND or logic OR structure; The output result of common control the 4th integrated operational amplifier output is the load switch control signal; When the charging testing circuit detects charging signals, its output is the result just be changed to and close load condition, when the charging testing circuit does not detect charging signals; The result is by the lock-out state signal deciding in its output; The lock-out state signal is when opening output state, and its output result is unlatching electric state, when the lock-out state signal is guard mode; The result is for closing load condition in its output; Whether the output of the 4th integrated operational amplifier is received the base stage of positive-negative-positive triode through second current-limiting resistance, controlled electric with the power supply positive terminal with reference to ground external load power switch control device together by the emitter and collector of PNP triode, and external electric switch controlling device is selected from pliotron, power field effect pipe or relay circuit structure.
2. battery discharge prevention circuit according to claim 1; It is characterized in that: the another kind of structure of said reference circuit is: reference circuit is made up of external direct current regulation circuit structure, and external direct current regulation circuit structure is selected from Zener diode, integrated regulator or transistor stabilized circuit structure.
3. battery discharge prevention circuit according to claim 1; It is characterized in that: the another kind of structure of said protection output circuit is: be made up of one tunnel the 4th integrated operational amplifier, positive-negative-positive triode, the 8th resistance and second current-limiting resistance; Input of the 4th integrated operational amplifier is directly connected to reference voltage provides reference offset; Another input is the load switch control signal through the output result that one the 8th resistance inserts lock-out state signal controlling the 4th integrated operational amplifier output; When the lock-out state signal is when opening output state; Its output result is for opening the electric state; When the lock-out state signal was guard mode, the result was for closing load condition in its output, and the output of the 4th integrated operational amplifier is received the base stage of positive-negative-positive triode through second current-limiting resistance; Whether controlled electric with the power supply positive terminal with reference to ground external load power switch control device together by the emitter and collector of PNP triode, external electric switch controlling device is selected from pliotron, power field effect pipe or relay circuit structure.
4. battery discharge prevention circuit according to claim 1; It is characterized in that: the another kind of structure of said protection output circuit is: be made up of one tunnel the 4th integrated operational amplifier, the 8th resistance and a diode; Input of the 4th integrated operational amplifier is directly connected to reference voltage provides reference offset; Another input inserts the lock-out state signal through one the 8th resistance; Insert charging signals through diode simultaneously and form logical AND or logic OR structure, the output result who controls the 4th integrated operational amplifier output jointly is the load switch control signal, when the charging testing circuit detects charging signals; Its output result just is changed to and closes load condition; When the charging testing circuit did not detect charging signals, the result was by the lock-out state signal deciding in its output, and the lock-out state signal is when opening output state; Its output result is for opening the electric state; When the lock-out state signal was guard mode, the result was for closing load condition in its output, the output of the 4th integrated operational amplifier with the power supply positive terminal and with reference to together external load power switch control device control whether to electric; External electric switch controlling device is selected from the power switch circuit structure that triode, optocoupler, power field effect pipe or relay constitute, and perhaps external electric switch controlling device is selected from the power switch circuit structure of FET and pliotron formation.
5. battery discharge prevention circuit according to claim 1; It is characterized in that: the positive supply pin of described first integrated operational amplifier, second integrated operational amplifier, the 3rd integrated operational amplifier and the 4th integrated operational amplifier is all directly received the power supply positive terminal; The negative supply pin is all directly received the power supply negative pole end, and between first integrated operational amplifier, second integrated operational amplifier, the 3rd integrated operational amplifier and the positive and negative power pins of the 4th integrated operational amplifier all and be connected to an electric capacity that power supply is carried out the filtering decoupling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101473714A CN101814726B (en) | 2010-04-14 | 2010-04-14 | Battery discharge prevention circuit |
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| CN2010101473714A CN101814726B (en) | 2010-04-14 | 2010-04-14 | Battery discharge prevention circuit |
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| CN101814726B true CN101814726B (en) | 2012-07-18 |
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| CN105743188B (en) * | 2016-05-13 | 2018-03-20 | 信阳师范学院 | Lead-acid battery group protects system |
| CN106786399B (en) * | 2016-11-30 | 2018-12-25 | 合肥同智机电控制技术有限公司 | A kind of storage battery under-voltage automatically shuts down lock-in circuit |
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| CN108768314A (en) * | 2018-07-18 | 2018-11-06 | 天津大学 | A kind of circuit that amplifier negative port is protected with discrete component |
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| CN109347466B (en) * | 2018-11-12 | 2023-01-13 | 天津航空机电有限公司 | Switching circuit and electronic equipment |
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| CN113362503B (en) * | 2021-06-16 | 2022-06-10 | 佛山予恩科技有限公司 | Entrance guard backup battery controller and automatic door entrance guard control method |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3567512B2 (en) * | 1994-10-11 | 2004-09-22 | ソニー株式会社 | Battery protection circuit |
| CN2922234Y (en) * | 2006-06-08 | 2007-07-11 | 潍坊光华电池有限公司 | Over-discharge protecting circuit for power lithium ion cell |
| CN201146379Y (en) * | 2008-01-25 | 2008-11-05 | 储吉旺 | Accumulator over discharging protector |
-
2010
- 2010-04-14 CN CN2010101473714A patent/CN101814726B/en not_active Expired - Fee Related
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| CN101814726A (en) | 2010-08-25 |
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Application publication date: 20100825 Assignee: SICHUAN TIANYI SCIENCE AND TECHNOLOGY DEV Co.,Ltd. Assignor: Luo Kanglin Contract record no.: 2014510000023 Denomination of invention: Battery discharge prevention circuit Granted publication date: 20120718 License type: Exclusive License Record date: 20140414 |
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