CN210111651U - Battery self-discharge prevention circuit and charger - Google Patents
Battery self-discharge prevention circuit and charger Download PDFInfo
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- CN210111651U CN210111651U CN201921205769.1U CN201921205769U CN210111651U CN 210111651 U CN210111651 U CN 210111651U CN 201921205769 U CN201921205769 U CN 201921205769U CN 210111651 U CN210111651 U CN 210111651U
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Abstract
The utility model discloses a prevent battery self discharge circuit and charger, through setting up switch unit and partial pressure unit. In the practical application process, when the battery is charged, the MOS tube Q1 is conducted, when the battery is fully charged, the voltage value at the moment is acquired by the acquisition end of the control chip through the voltage division of the resistor R4 and the resistor R5, the battery is judged to be fully charged, at the moment, the control chip outputs a low level signal through the control output end to enable the MOS tube Q1 to be cut off, the connection with the battery is disconnected, the connection with the battery is cut off in time, the fully charged battery is prevented from discharging, and the circuit stability is strong; in addition, the resistor R1 and the resistor R2 both have the function of limiting current, so that the circuit is prevented from being burnt by overlarge current; in addition, the capacitor C1 and the capacitor C2 both play a role of filtering, and voltage waveforms are improved.
Description
Technical Field
The utility model relates to a charger technical field especially relates to a prevent battery self discharge circuit and charger.
Background
At present, a charger adopts a high-frequency power supply technology and an advanced intelligent dynamic adjustment charging technology. The power frequency machine is designed by the traditional analog circuit principle, the internal electric devices of the machine are large, and small noise exists in the general operation with large load, but the machine type has stronger resistance performance in severe power grid environment conditions, and the reliability and the stability are stronger than those of a high-frequency machine. There are many chargers, such as lead-acid battery chargers, testing and monitoring of valve-controlled sealed lead-acid batteries, cadmium-nickel battery chargers, nickel-hydrogen battery chargers, lithium ion battery chargers, portable electronic device lithium ion battery chargers, lithium ion battery protection circuit chargers, electric vehicle battery chargers, vehicle chargers, and the like.
The existing charger is internally provided with a charging circuit, but the existing charging circuit can not cut off the connection with the battery after the battery is fully charged, because the chemical property of the battery is active, if the connection with the battery is not cut off in time after the battery is fully charged, the battery can usually discharge by itself, and when the phenomenon occurs, the discharge of the battery can influence the working stability of the charging circuit, and even the charging circuit can be damaged in serious cases; in addition, the conventional charging circuit is not provided with a related current-limiting electronic element inside, and if the current of the charging circuit is large, the working stability of the charging circuit is also affected, and the charging circuit may be burnt in severe cases; in addition, the conventional charging circuit does not perform filtering processing on the voltage waveform, so that clutter signals contained in the voltage waveform in the charging circuit are excessive, and the working stability of the charging circuit is also affected.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the weak point among the prior art, provide one kind after the battery is full of electricity, can in time cut off and be connected between the battery, prevent that battery self is discharged, stability is stronger, possesses current-limiting function, prevents that the too big circuit that burns out of electric current and can also carry out filtering to voltage and handle, improve the voltage waveform prevent battery self discharge circuit and charger.
The purpose of the utility model is realized through the following technical scheme:
a battery self-discharge prevention circuit comprising:
a switch unit, which includes a resistor R1, a resistor R2, a MOS transistor Q1, a resistor R3 and a capacitor C1, wherein a source of the MOS transistor Q1 is connected in series with the resistor R1 as a first input terminal of the switch unit and connected to a positive electrode of a battery, a gate of the MOS transistor Q1 is connected in series with the resistor R3 as a second input terminal of the switch unit and connected to a control output terminal of a control chip, a drain of the MOS transistor Q1 is connected to an output terminal of the switch unit, one end of the resistor R2 is connected to one end of the resistor R1, and the other end of the resistor R2 is connected to a source of the MOS transistor Q1 and one end of the capacitor C1, respectively; and
the voltage dividing unit comprises a resistor R4, a resistor R5, a resistor R6 and a capacitor C2, one end of the resistor R4 is used as the input end of the voltage dividing unit and is connected with the drain electrode of the MOS tube Q1, the other end of the resistor R4 is respectively connected with one end of the resistor R5, the other end of the capacitor C1 and one end of the capacitor C2 are connected, the other end of the resistor R4 is grounded, the other end of the resistor R5 is connected with the grid electrode of the MOS tube Q1, one end of the resistor R6 is connected with one end of the resistor R4, the other end of the resistor R6 is used as the output end of the voltage dividing unit and is connected with the acquisition end of the control chip, and the other end of the capacitor C2 is connected with the other end of the resistor R6.
In one embodiment, the resistance R1 has a value of 180K Ω.
In one embodiment, the resistance R2 has a value of 180K Ω.
In one embodiment, the capacitance size of the capacitor C1 is 0.1 uF.
In one embodiment, the resistance R3 has a value of 1.2K Ω.
In one embodiment, the resistance R4 has a value of 16K Ω.
In one embodiment, the resistance R5 is 20K Ω.
In one embodiment, the resistance R6 has a value of 10K Ω.
In one embodiment, the capacitance of the capacitor C2 is 1000 pF.
A charger comprises the circuit for preventing the self-discharge of the battery.
The utility model discloses compare in prior art's advantage and beneficial effect as follows:
the utility model discloses a prevent battery self discharge circuit and charger, through setting up switch unit and partial pressure unit. In the practical application process, when the battery is charged, the MOS tube Q1 is switched on, after the battery is fully charged, the voltage value at the moment is acquired by the acquisition end of the control chip through the voltage division of the resistor R1, the resistor R2 and the resistor R4, the battery is judged to be fully charged, at the moment, the control chip outputs a low-level signal through the control output end to enable the MOS tube Q1 to be cut off, the connection with the battery is disconnected, the connection between the control chip and the battery is cut off in time, the fully charged battery is prevented from discharging, and the circuit stability is strong; in addition, the resistor R1 and the resistor R2 also have the function of limiting current, so that the circuit is prevented from being burnt by overlarge current; in addition, the capacitor C1 and the capacitor C2 both play a role of filtering, and voltage waveforms are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic circuit diagram of a battery self-discharge prevention circuit according to an embodiment of the present invention.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a charger includes a battery self-discharge prevention circuit 10, wherein the battery self-discharge prevention circuit 10 includes a switch unit 100 and a voltage division unit 200.
As such, it should be noted that the switch unit 100 functions as a switch for disconnecting or connecting the battery; the voltage dividing unit 200 functions to divide voltage.
Referring to fig. 1, the switch unit 100 includes a resistor R1, a resistor R2, a MOS transistor Q1, a resistor R3, and a capacitor C1, a source series resistor R1 of the MOS transistor Q1 is used as a first input terminal of the switch unit 100 and connected to the positive electrode of the battery, a gate series resistor R3 of the MOS transistor Q1 is used as a second input terminal of the switch unit 100 and connected to the control output terminal of the control chip, a drain of the MOS transistor Q1 is used as an output terminal of the switch unit, one end of the resistor R2 is connected to one end of the resistor R1, and the other end of the resistor R2 is connected to a source of the MOS transistor Q1 and one end of the capacitor C1, respectively.
Therefore, it should be noted that both the resistor R1 and the resistor R2 function as current limiting to prevent the circuit from being burnt by excessive current; the MOS transistor Q1 plays a role of a switch, when the grid electrode of the MOS transistor Q1 inputs a high level, the MOS transistor Q1 is conducted, and is connected with the battery at the moment; when the grid of the MOS transistor Q1 inputs a low level, the MOS transistor Q1 is cut off, and the battery is disconnected at the moment; the resistor R3 plays a role in protecting the MOS transistor Q1; the capacitor C1 acts as a filter.
Referring to fig. 1, the voltage dividing unit 200 includes a resistor R4, a resistor R5, a resistor R6, and a capacitor C2, one end of the resistor R4 is connected to the drain of the MOS transistor Q1 as the input terminal of the voltage dividing unit 200, the other end of the resistor R4 is connected to one end of the resistor R5, the other end of the capacitor C1, and one end of the capacitor C2, the other end of the resistor R4 is grounded, the other end of the resistor R5 is connected to the gate of the MOS transistor Q1, one end of the resistor R6 is connected to one end of the resistor R4, the other end of the resistor R6 is connected to the output terminal of the voltage dividing unit 200 and the acquisition terminal of the control chip, and the other end of the capacitor C2 is connected to the.
Therefore, it should be noted that, when the battery is charged, the MOS transistor Q1 is turned on, after the battery is fully charged, the voltage value at this time is collected by the collection end of the control chip through the voltage division of the resistor R1, the resistor R2 and the resistor R4, and it is determined that the battery is fully charged, at this time, the control chip outputs a low level signal through the control output end to prompt the MOS transistor Q1 to be turned off, the connection with the battery is disconnected, the connection with the battery is cut off in time, the fully charged battery is prevented from being discharged, and the circuit stability is strong; the resistor R6 also plays a role in limiting current; the capacitor C2 acts as a filter to improve the voltage waveform.
Specifically, in one embodiment, the resistance of the resistor R1 is 180K Ω; the resistance value of the resistor R2 is 180K omega; the capacitance size of the capacitor C1 is 0.1 uF; the resistance value of the resistor R3 is 1.2K omega; the resistance value of the resistor R4 is 16K omega; the resistance value of the resistor R5 is 20K omega; the resistance value of the resistor R6 is 10K omega; the capacitance of the capacitor C2 is 1000 pF.
The utility model discloses a prevent battery self discharge circuit and charger, through setting up switch unit and partial pressure unit. In the practical application process, when the battery is charged, the MOS tube Q1 is conducted, when the battery is fully charged, the voltage value at the moment is acquired by the acquisition end of the control chip through the voltage division of the resistor R4 and the resistor R5, the battery is judged to be fully charged, at the moment, the control chip outputs a low level signal through the control output end to enable the MOS tube Q1 to be cut off, the connection with the battery is disconnected, the connection with the battery is cut off in time, the fully charged battery is prevented from discharging, and the circuit stability is strong; in addition, the resistor R1 and the resistor R2 both have the function of limiting current, so that the circuit is prevented from being burnt by overlarge current; in addition, the capacitor C1 and the capacitor C2 both play a role of filtering, and voltage waveforms are improved.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A battery self-discharge prevention circuit, comprising:
a switch unit, which includes a resistor R1, a resistor R2, a MOS transistor Q1, a resistor R3 and a capacitor C1, wherein a source of the MOS transistor Q1 is connected in series with the resistor R1 as a first input terminal of the switch unit and connected to a positive electrode of a battery, a gate of the MOS transistor Q1 is connected in series with the resistor R3 as a second input terminal of the switch unit and connected to a control output terminal of a control chip, a drain of the MOS transistor Q1 is connected to an output terminal of the switch unit, one end of the resistor R2 is connected to one end of the resistor R1, and the other end of the resistor R2 is connected to a source of the MOS transistor Q1 and one end of the capacitor C1, respectively; and
the voltage dividing unit comprises a resistor R4, a resistor R5, a resistor R6 and a capacitor C2, one end of the resistor R4 is used as the input end of the voltage dividing unit and is connected with the drain electrode of the MOS tube Q1, the other end of the resistor R4 is respectively connected with one end of the resistor R5, the other end of the capacitor C1 and one end of the capacitor C2 are connected, the other end of the resistor R4 is grounded, the other end of the resistor R5 is connected with the grid electrode of the MOS tube Q1, one end of the resistor R6 is connected with one end of the resistor R4, the other end of the resistor R6 is used as the output end of the voltage dividing unit and is connected with the acquisition end of the control chip, and the other end of the capacitor C2 is connected with the other end of the resistor R6.
2. The battery self-discharge prevention circuit as claimed in claim 1, wherein the resistance R1 is 180K Ω.
3. The battery self-discharge prevention circuit as claimed in claim 1, wherein the resistance R2 is 180K Ω.
4. The battery self-discharge prevention circuit as claimed in claim 1, wherein the capacitance of the capacitor C1 is 0.1uF in magnitude.
5. The battery self-discharge prevention circuit as claimed in claim 1, wherein the resistance value of the resistor R3 is 1.2K Ω.
6. The battery self-discharge prevention circuit as claimed in claim 1, wherein the resistance R4 is 16K Ω.
7. The battery self-discharge prevention circuit as claimed in claim 1, wherein the resistance R5 is 20K Ω.
8. The battery self-discharge prevention circuit as claimed in claim 1, wherein the resistance R6 is 10K Ω.
9. The battery self-discharge prevention circuit of claim 1, wherein the capacitance of the capacitor C2 is 1000pF in magnitude.
10. A charger comprising the battery self-discharge prevention circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921205769.1U CN210111651U (en) | 2019-07-29 | 2019-07-29 | Battery self-discharge prevention circuit and charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921205769.1U CN210111651U (en) | 2019-07-29 | 2019-07-29 | Battery self-discharge prevention circuit and charger |
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| Publication Number | Publication Date |
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| CN210111651U true CN210111651U (en) | 2020-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921205769.1U Active CN210111651U (en) | 2019-07-29 | 2019-07-29 | Battery self-discharge prevention circuit and charger |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111884303A (en) * | 2020-08-19 | 2020-11-03 | 深圳市爱都科技有限公司 | Charging control circuit, charging control method and electronic device |
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2019
- 2019-07-29 CN CN201921205769.1U patent/CN210111651U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111884303A (en) * | 2020-08-19 | 2020-11-03 | 深圳市爱都科技有限公司 | Charging control circuit, charging control method and electronic device |
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