CN214707216U - Lead-acid battery charging control indicating circuit - Google Patents
Lead-acid battery charging control indicating circuit Download PDFInfo
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- CN214707216U CN214707216U CN202120449231.6U CN202120449231U CN214707216U CN 214707216 U CN214707216 U CN 214707216U CN 202120449231 U CN202120449231 U CN 202120449231U CN 214707216 U CN214707216 U CN 214707216U
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Abstract
The embodiment of the utility model provides a lead acid battery charging control indicating circuit is related to, include: the output rectifying and filtering module, the switch control module and the state indicating module; the switch control module includes: the resistor R1, the resistor R2 and the NMOS transistor Q1; the resistor R1 and the resistor R2 are connected between the output end of the output rectifying and filtering module and the ground in series; the drain electrode of the NMOS tube Q1 is connected with the output end of the output rectifying and filtering module, the source electrode is connected with the input end of the switch control module, the grid electrode is connected with the connecting node between the resistor R1 and the resistor R2, and the drain electrode and the grid electrode of the NMOS tube Q1 are connected with the resistor R1 in parallel; the status indication module includes: a relay RL 1; when the lead-acid battery is connected with the positive output terminal and the negative output terminal, the coil of the relay is electrified, the fixed end of the relay is communicated with the first contact end, and the state indicating module is connected into the loop; after the lead-acid battery is removed from the space between the positive output terminal and the negative output terminal, the coil of the relay loses power, the fixed end of the relay is disconnected with the first contact end, the second contact end is contacted, and the state indicating module is disconnected.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to a lead acid battery charging control indicating circuit.
Background
A lead-acid battery is a storage battery with electrodes mainly made of lead and its oxides and electrolyte solution of sulfuric acid solution. In the discharge state of the lead-acid battery, the main component of the positive electrode is lead dioxide, and the main component of the negative electrode is lead; in a charged state, the main components of the positive electrode and the negative electrode are lead sulfate.
Although the conventional charging device has a light jump display after the lead-acid battery is fully charged, the charging device can still keep the charging state, and the lead-acid battery is easily charged to an overvoltage state. The side reaction of electrolysis water can be produced in the excessive pressure charging, lead-acid batteries positive pole produces oxygen and shifts to the negative pole and take place oxygen complex reaction, it makes lead-acid batteries temperature rise to emit the heat, can reduce lead-acid batteries's life-span greatly on the one hand like this, also can bring the uncertainty to lead-acid batteries's safety, the charge indicator of the current charger of on the other hand still is in the state of normally shining under the condition that the battery does not have the access, the existing life-span that decreases the inside components and parts of charger of long-time use like this, again energy-concerving and environment-protective.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a lead acid battery charge control indicating circuit can avoid lead acid battery to be full of the unable automatic cutout charging circuit in back and produce overvoltage voltage, causes the problem of harm easily, and effectual guarantee lead acid battery's safety can automatic cutout charge indicator simultaneously after removing lead acid battery, realizes energy-concerving and environment-protective.
Therefore, the embodiment of the utility model provides a lead-acid batteries charging control indicating circuit is provided, lead-acid batteries charging control indicating circuit includes: the output rectifying and filtering module, the switch control module and the state indicating module;
the switch control module includes: the resistor R1, the resistor R2 and the NMOS transistor Q1; the resistor R1 and the resistor R2 are connected between the output end of the output rectifying and filtering module and the ground in series; the drain electrode of the NMOS tube Q1 is connected with the output end of the output rectifying and filtering module, the source electrode is connected with the input end of the switch control module, the grid electrode is connected with the connecting node between the resistor R1 and the resistor R2, and the drain electrode and the grid electrode of the NMOS tube Q1 are connected with the resistor R1 in parallel;
the status indication module comprises: a relay RL 1; the relay RL1 is provided with a fixed end, a first contact end, a second contact end and a relay coil, wherein the relay coil is provided with two output terminals which are respectively connected with a positive output terminal and a negative output terminal of the lead-acid battery charging control indication circuit for charging and outputting the lead-acid battery; the first contact end is the input end of the switch control module, the second contact end is suspended, and the fixed end is connected with the positive output terminal;
when the lead-acid battery is connected with the positive output terminal and the negative output terminal, the coil of the relay is electrified, the fixed end of the relay is communicated with the first contact end, and the state indicating module is connected into the loop;
after the lead-acid battery is removed from the space between the positive output terminal and the negative output terminal, the coil of the relay loses power, the fixed end of the relay is disconnected with the first contact end, the second contact end is contacted, and the state indicating module is disconnected.
Preferably, the sum of the grid-source voltage of the NMOS transistor Q1 and the voltage on the resistor R2 is equal to the lead-acid battery voltage;
after the lead-acid battery is connected into the positive and negative output terminals, the grid source voltage V of the NMOS tube Q1GSGreater than the turn-on voltage VthThe NMOS tube Q1 is connected with the charging loop;
as charging time goes on, the voltage at two ends of the lead-acid battery rises, the partial voltage on the resistor R2 increases, and the grid source voltage V of the NMOS tube Q1GSReduce when the gate-source voltage V of the NMOS transistor Q1 is reducedGSLess than the turn-on voltage VthAnd when the NMOS tube is turned off, the charging loop is disconnected.
Preferably, the status indication module further comprises: resistors R3, R4, R5, R6, R7, R8, R9 and R10, a voltage stabilizing diode ZD1, a voltage comparator U1, a PNP triode Q2, an NPN triode Q3 and light emitting diodes D2 and D3;
the eighth pin of the resistor R3, the resistor R5 and the voltage comparator U1 is respectively connected with a positive output terminal, the other end of the resistor R3 is respectively connected with the third pin of the resistor R4 and the voltage comparator U1, the other end of the resistor R5 is respectively connected with the cathode of the zener diode ZD1 and the second pin of the voltage comparator U1, the other end of the resistor R4 is connected with the anode of the zener diode ZD1 and the fourth pin of the voltage comparator U1 is connected with the ground, and the first pin of the voltage comparator U1 is respectively connected with the resistor R6 and the resistor R7; the other end of the resistor R6 is connected with the base electrode of a PNP triode Q2, the emitter electrode of the PNP triode Q2 is connected with the resistor R8 and then connected with the cathode of the light-emitting diode D2, and the anode of the light-emitting diode D2 is connected with a positive output terminal; the other end of the resistor R7 is connected with the base of an NPN triode Q3 and a resistor R10, the collector of the NPN triode Q3 is connected with the resistor R9 and then connected with the cathode of a light-emitting diode D3, the anode of the light-emitting diode D3 is connected with a positive output terminal, and the emitter of the NPN triode Q3 and the other end of the resistor R10 are connected with the negative output terminal and are grounded.
Further preferably, after the lead-acid battery is connected to the positive and negative output terminals, the divided voltage of the resistor R4 is smaller than the regulated voltage value set by the zener diode ZD1, the voltage of the third pin of the voltage comparator U1 is lower than the voltage of the second pin, the first pin outputs a low level, the PNP triode Q2 is turned on, the NPN triode Q3 is turned off, the light-emitting diode D2 is turned on, and the D3 is turned off;
along with the lapse of charging time, as the voltage of the two ends of the lead-acid battery rises, and the divided voltage of the resistor R4 is greater than the regulated voltage value set by the voltage regulator diode ZD1, the voltage of the third pin of the voltage comparator U1 is greater than the voltage of the second pin, the first pin outputs high level, the PNP triode Q2 is cut off, the NPN triode Q3 is conducted, the light emitting diode D2 is extinguished, and the D3 is lightened.
Preferably, the light emitting diodes D2, D3 are both extinguished after the lead acid battery is removed from between the positive and negative output terminals.
Preferably, the output rectifying and filtering module includes: a schottky diode D1 and an output capacitor C1;
the anode of the Schottky diode D1 is connected with the secondary output of the transformer T1, and the cathode of the Schottky diode D1 is connected with the anode of the electrolytic capacitor C1 to be used as the output end of the output rectifying and filtering module; the negative electrode of the electrolytic capacitor C1 is grounded;
the secondary output of the transformer T1 is rectified by a Schottky diode D1, filtered into a direct current signal by an electrolytic capacitor C1 and output by the output end of the output rectifying and filtering module.
The embodiment of the utility model provides a pair of lead acid battery charge control indicating circuit can be full of the back automatic cutout charging circuit and produce overvoltage voltage, effectual guarantee safety of charging at lead acid battery. The charging indicator lamp can be automatically cut off after the lead-acid battery is removed from the charger, so that energy conservation and environmental protection are realized.
Drawings
Fig. 1 is a circuit diagram of a lead-acid battery charging control indicating circuit provided by an embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
The embodiment of the utility model provides a lead acid battery charging control indicating circuit, lead acid battery charging control indicating circuit set up the secondary side at charging circuit. As shown in fig. 1, the lead-acid battery charging control indication circuit includes: output rectification filter module, switch control module and state indication module
The output rectifying and filtering module comprises: a schottky diode D1 and an output capacitor C1; the anode of the Schottky diode D1 is connected with the secondary output of the transformer T1, and the cathode of the Schottky diode D1 is connected with the anode of the electrolytic capacitor C1 to be used as the output end of the output rectifying and filtering module; the negative electrode of the electrolytic capacitor C1 is grounded; the secondary output of the transformer T1 is rectified by a Schottky diode D1, filtered into a direct current signal by an electrolytic capacitor C1 and output by the output end of the output rectifying and filtering module.
The switch control module includes: the resistor R1, the resistor R2 and the NMOS transistor Q1; the resistor R1 and the resistor R2 are connected between the output end of the output rectifying and filtering module and the ground in series; the drain electrode of the NMOS tube Q1 is connected with the output end of the output rectifying and filtering module, the source electrode is connected with the input end of the switch control module, the grid electrode is connected with the connecting node between the resistor R1 and the resistor R2, and the drain electrode and the grid electrode of the NMOS tube Q1 are connected with the resistor R1 in parallel;
the switch control module is used for automatically cutting off a charging loop after the lead-acid battery is fully charged to generate overvoltageAnd (6) pressing. Because the sum of the grid-source voltage of the NMOS transistor Q1 and the voltage on the resistor R2 is equal to the voltage of the lead-acid battery, the grid-source voltage V of the NMOS transistor Q1 can be realized after the lead-acid battery is connected to the positive output terminal and the negative output terminal (BATT +/-) in the figure by reasonably configuring the resistor R2GSGreater than the turn-on voltage VthThe NMOS tube Q1 turns on the charging loop, and as the charging time goes on, the voltage at two ends of the lead-acid battery rises, the partial voltage on the resistor R2 increases, and the grid source voltage V of the NMOS tube Q1GSReduce when the gate-source voltage V of the NMOS transistor Q1 is reducedGSLess than the turn-on voltage VthAnd when the NMOS tube is turned off, the charging loop is disconnected.
The status indication module includes: a relay RL 1; the relay RL1 is provided with a fixed end O, a first contact end A, a second contact end B and a relay coil, wherein the relay coil is provided with two output terminals which are respectively connected with a positive output terminal and a negative output terminal of the lead-acid battery charging control indication circuit for charging and outputting the lead-acid battery; the first contact end A is the input end of the switch control module, the second contact end B is suspended, and the fixed end is connected with the positive output terminal.
And under the no-load state of the charging circuit, the fixed end O of the relay is connected with the second contact end B. When the lead-acid battery is connected with the positive output terminal and the negative output terminal, the coil of the relay is electrified, the fixed end O of the relay is communicated with the first contact end A, and the state indicating module is connected into the loop; after the lead-acid battery is removed from the space between the positive output terminal and the negative output terminal, the coil of the relay loses power, the fixed end O of the relay is disconnected with the first contact end A, the fixed end O of the relay is connected with the second contact end B, and the state indicating module is disconnected.
In this embodiment, as shown in fig. 1, a specific implementation circuit of the status indication module includes, in addition to the relay RL 1: resistors R3, R4, R5, R6, R7, R8, R9 and R10, a voltage stabilizing diode ZD1, a voltage comparator U1, a PNP triode Q2, an NPN triode Q3 and light emitting diodes D2 and D3;
the eighth pin of the resistor R3, the resistor R5 and the voltage comparator U1 is respectively connected with a positive output terminal, the other end of the resistor R3 is respectively connected with the third pin of the resistor R4 and the voltage comparator U1, the other end of the resistor R5 is respectively connected with the cathode of the zener diode ZD1 and the second pin of the voltage comparator U1, the other end of the resistor R4 is connected with the anode of the zener diode ZD1 and the fourth pin of the voltage comparator U1 is connected with the ground, and the first pin of the voltage comparator U1 is respectively connected with the resistor R6 and the resistor R7; the other end of the resistor R6 is connected with the base electrode of a PNP triode Q2, the emitter electrode of the PNP triode Q2 is connected with the resistor R8 and then connected with the cathode of the light-emitting diode D2, and the anode of the light-emitting diode D2 is connected with a positive output terminal; the other end of the resistor R7 is connected with the base of an NPN triode Q3 and a resistor R10, the collector of the NPN triode Q3 is connected with the resistor R9 and then connected with the cathode of a light-emitting diode D3, the anode of the light-emitting diode D3 is connected with a positive output terminal, and the emitter of the NPN triode Q3 and the other end of the resistor R10 are connected with the negative output terminal and are grounded.
After the lead-acid battery is connected to the positive output terminal and the negative output terminal, the voltage at the two ends of the lead-acid battery is divided through the resistor R4 and the resistor R3 in series. The divided voltage of the resistor R4 is smaller than the regulated voltage value set by the voltage regulator diode ZD1, the voltage of the third pin of the voltage comparator U1 is lower than the voltage of the second pin, the first pin outputs low level, the PNP triode Q2 is switched on, the NPN triode Q3 is switched off, the light-emitting diode D2 is turned on, and the D3 is turned off;
as the voltage across the lead acid battery increases over the charging time, the voltage division across resistor R4 increases. When the voltage is larger than the regulated voltage value set by the zener diode ZD1, the third pin voltage of the voltage comparator U1 is higher than the second pin voltage, the first pin outputs a high level, the PNP transistor Q2 is turned off, the NPN transistor Q3 is turned on, the light emitting diode D2 is turned off, and the D3 is turned on.
After the lead-acid battery is removed from between the positive and negative output terminals, the light emitting diodes D2, D3 are both extinguished.
Therefore, whether the lead-acid battery is fully charged or not can be clearly known through the on-off states of the light-emitting diodes D2 and D3. For convenient observation, the light emitting diodes D2 and D3 may be beads of different colors, respectively. For example, in this example, red and green leds are used for distinguishing.
According to the circuit provided by the embodiment, the selection of each resistor and each capacitor can be selected according to the actual functional requirements, and the specific numerical values of the resistors and the capacitors are not limited again.
The embodiment of the utility model provides a pair of lead acid battery charge control indicating circuit can be full of the back automatic cutout charging circuit and produce overvoltage voltage, effectual guarantee safety of charging at lead acid battery. The charging indicator lamp can be automatically cut off after the lead-acid battery is removed from the charger, so that energy conservation and environmental protection are realized.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A lead-acid battery charging control indicating circuit, characterized in that, lead-acid battery charging control indicating circuit includes: the output rectifying and filtering module, the switch control module and the state indicating module;
the switch control module includes: the resistor R1, the resistor R2 and the NMOS transistor Q1; the resistor R1 and the resistor R2 are connected between the output end of the output rectifying and filtering module and the ground in series; the drain electrode of the NMOS tube Q1 is connected with the output end of the output rectifying and filtering module, the source electrode is connected with the input end of the switch control module, the grid electrode is connected with the connecting node between the resistor R1 and the resistor R2, and the drain electrode and the grid electrode of the NMOS tube Q1 are connected with the resistor R1 in parallel;
the status indication module comprises: a relay RL 1; the relay RL1 is provided with a fixed end, a first contact end, a second contact end and a relay coil, wherein the relay coil is provided with two output terminals which are respectively connected with a positive output terminal and a negative output terminal of the lead-acid battery charging control indication circuit for charging and outputting the lead-acid battery; the first contact end is the input end of the switch control module, the second contact end is suspended, and the fixed end is connected with the positive output terminal;
when the lead-acid battery is connected with the positive output terminal and the negative output terminal, the coil of the relay is electrified, the fixed end of the relay is communicated with the first contact end, and the state indicating module is connected into the loop;
after the lead-acid battery is removed from the space between the positive output terminal and the negative output terminal, the coil of the relay loses power, the fixed end of the relay is disconnected with the first contact end, the second contact end is contacted, and the state indicating module is disconnected.
2. The lead-acid battery charging control indication circuit according to claim 1, characterized in that the sum of the gate-source voltage of the NMOS transistor Q1 and the voltage across the resistor R2 is equal to the lead-acid battery voltage;
after the lead-acid battery is connected into the positive and negative output terminals, the grid source voltage V of the NMOS tube Q1GSGreater than the turn-on voltage VthThe NMOS tube Q1 is connected with the charging loop;
as charging time goes on, the voltage at two ends of the lead-acid battery rises, the partial voltage on the resistor R2 increases, and the grid source voltage V of the NMOS tube Q1GSReduce when the gate-source voltage V of the NMOS transistor Q1 is reducedGSLess than the turn-on voltage VthAnd when the NMOS tube is turned off, the charging loop is disconnected.
3. The lead-acid battery charging control indication circuit of claim 1, wherein the status indication module further comprises: resistors R3, R4, R5, R6, R7, R8, R9 and R10, a voltage stabilizing diode ZD1, a voltage comparator U1, a PNP triode Q2, an NPN triode Q3 and light emitting diodes D2 and D3;
the eighth pin of the resistor R3, the resistor R5 and the voltage comparator U1 is respectively connected with a positive output terminal, the other end of the resistor R3 is respectively connected with the third pin of the resistor R4 and the voltage comparator U1, the other end of the resistor R5 is respectively connected with the cathode of the zener diode ZD1 and the second pin of the voltage comparator U1, the other end of the resistor R4 is connected with the anode of the zener diode ZD1 and the fourth pin of the voltage comparator U1 is connected with the ground, and the first pin of the voltage comparator U1 is respectively connected with the resistor R6 and the resistor R7; the other end of the resistor R6 is connected with the base electrode of a PNP triode Q2, the emitter electrode of the PNP triode Q2 is connected with the resistor R8 and then connected with the cathode of the light-emitting diode D2, and the anode of the light-emitting diode D2 is connected with a positive output terminal; the other end of the resistor R7 is connected with the base of an NPN triode Q3 and a resistor R10, the collector of the NPN triode Q3 is connected with the resistor R9 and then connected with the cathode of a light-emitting diode D3, the anode of the light-emitting diode D3 is connected with a positive output terminal, and the emitter of the NPN triode Q3 and the other end of the resistor R10 are connected with the negative output terminal and are grounded.
4. The lead-acid battery charging control indication circuit of claim 3,
after the lead-acid battery is connected to the positive output terminal and the negative output terminal, the divided voltage of the resistor R4 is smaller than the regulated voltage value set by the voltage-regulator diode ZD1, the voltage of the third pin of the voltage comparator U1 is lower than the voltage of the second pin, the first pin outputs low level, the PNP triode Q2 is switched on, the NPN triode Q3 is switched off, the light-emitting diode D2 is turned on, and the D3 is turned off;
along with the lapse of charging time, as the voltage of the two ends of the lead-acid battery rises, and the divided voltage of the resistor R4 is greater than the regulated voltage value set by the voltage regulator diode ZD1, the voltage of the third pin of the voltage comparator U1 is greater than the voltage of the second pin, the first pin outputs high level, the PNP triode Q2 is cut off, the NPN triode Q3 is conducted, the light emitting diode D2 is extinguished, and the D3 is lightened.
5. The lead-acid battery charging control indication circuit according to claim 3, characterized in that the light emitting diodes D2, D3 are both extinguished after the lead-acid battery is removed from between the positive and negative output terminals.
6. The lead-acid battery charging control indication circuit according to claim 1, wherein the output rectifying and filtering module comprises: a schottky diode D1 and an output capacitor C1;
the anode of the Schottky diode D1 is connected with the secondary output of the transformer T1, and the cathode of the Schottky diode D1 is connected with the anode of the electrolytic capacitor C1 to be used as the output end of the output rectifying and filtering module; the negative electrode of the electrolytic capacitor C1 is grounded;
the secondary output of the transformer T1 is rectified by a Schottky diode D1, filtered into a direct current signal by an electrolytic capacitor C1 and output by the output end of the output rectifying and filtering module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120449231.6U CN214707216U (en) | 2021-03-02 | 2021-03-02 | Lead-acid battery charging control indicating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120449231.6U CN214707216U (en) | 2021-03-02 | 2021-03-02 | Lead-acid battery charging control indicating circuit |
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| Publication Number | Publication Date |
|---|---|
| CN214707216U true CN214707216U (en) | 2021-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120449231.6U Active CN214707216U (en) | 2021-03-02 | 2021-03-02 | Lead-acid battery charging control indicating circuit |
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| CN (1) | CN214707216U (en) |
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- 2021-03-02 CN CN202120449231.6U patent/CN214707216U/en active Active
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Address after: Room 101-401, building 38, digital Silicon Valley Industrial Park, No. 999, Yinhuang East Road, Maanshan economic and Technological Development Zone, 243000, Anhui Province Patentee after: Dongke semiconductor (Anhui) Co.,Ltd. Address before: Building 38, digital Silicon Valley International Industrial Park, 999 Yinhuang East Road, Dangtu County, Ma'anshan City, Anhui Province 243100 Patentee before: ANHUI DONGKE SEMICONDUCTOR Co.,Ltd. |
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