CN209298949U - A kind of battery low-voltage protection circuit - Google Patents
A kind of battery low-voltage protection circuit Download PDFInfo
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- CN209298949U CN209298949U CN201920165555.XU CN201920165555U CN209298949U CN 209298949 U CN209298949 U CN 209298949U CN 201920165555 U CN201920165555 U CN 201920165555U CN 209298949 U CN209298949 U CN 209298949U
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Abstract
The utility model provides a kind of battery low-voltage protection circuit, including the metal-oxide-semiconductor of on-off control is connect with external equipment for battery output and for the low pressure voltage-stablizer of control, the input terminal of the low pressure voltage-stablizer and enable end are connect with battery output, the output end of the low pressure voltage-stablizer passes sequentially through the 4th resistance and the 5th resistance is connect with ground wire, to form low pressure voltage-stablizer output control circuit by the 4th resistance and the 5th resistance, the output end is connected by the grid of first resistor and metal-oxide-semiconductor, the source electrode of the metal-oxide-semiconductor is connect with battery output, the drain electrode of the metal-oxide-semiconductor is connect with external equipment, the grid of the metal-oxide-semiconductor passes sequentially through second resistance and 3rd resistor connects with electric wire, to pass through first resistor, second resistance and 3rd resistor form metal-oxide-semiconductor turn-on control circuit.Battery protection can be effectively carried out by the utility model, reduce power consumption and cost.
Description
Technical field
The utility model belongs to battery protection field more particularly to a kind of battery low-voltage protection circuit.
Background technique
Currently, single-unit battery core in the market, is all without battery protection.But the characteristic according to battery core is not allow to surpass
Pressure input charging, does not allow low pressure overdischarge yet, if needing to increase on product when being applied directly in product corresponding
Protect circuit.For over-voltage charge protection, all charging management chips all have the function of over-voltage cut-off charging, but do not have
There is the function with low pressure over.Meanwhile currently on the market dedicated for the core of the battery protection for low pressure overdischarge
Piece is all that fixed voltage value can not be adjusted protection voltage according to the actual situation, and power consumption is higher, and circuit is more complicated.
So a kind of corresponding battery low pressure over-discharge protection circuit reply is needed to use needs.
Utility model content
The purpose of this utility model is to provide a kind of battery low-voltage protection circuit, can effectively carry out battery protection, reduce
Power consumption and cost.
To realize the purpose, a kind of battery low-voltage protection circuit is provided, including be used for battery output and external equipment
The metal-oxide-semiconductor that connection on-off controls and the low pressure voltage-stablizer for control, the input terminal of the low pressure voltage-stablizer and enable end and electricity
The connection of pond output end, the output end of the low pressure voltage-stablizer passes sequentially through the 4th resistance and the 5th resistance is connect with ground wire, thus
Form low pressure voltage-stablizer output control circuit by the 4th resistance and the 5th resistance, the output end by first resistor with
The grid of metal-oxide-semiconductor connects, and the source electrode of the metal-oxide-semiconductor is connect with battery output, and the drain electrode of the metal-oxide-semiconductor and external equipment connect
It connects, the grid of the metal-oxide-semiconductor passes sequentially through second resistance and 3rd resistor connects with electric wire, to pass through first resistor, second
Resistance and 3rd resistor form metal-oxide-semiconductor turn-on control circuit.
Preferably, the input terminal of the low pressure voltage-stablizer also passes through third capacitor and connect with ground wire.
Preferably, the third capacitor is 4.7uF.
Preferably, the input terminal of the low pressure voltage-stablizer is connect by first capacitor with ground wire.
Preferably, the first capacitor is 2.2uF.
Preferably, the drain electrode of the metal-oxide-semiconductor is connect by the second capacitor with ground wire.
Preferably, second capacitor is 2.2uF.
Preferably, the 4th resistance and the 5th resistance are 100k Ω.
Preferably, the first resistor is 100k Ω, and the second resistance is 300k Ω, and the 3rd resistor is 200k
Ω。
Preferably, the empty foot of the low pressure voltage-stablizer is connect with the connecting pin of the 4th resistance and the 5th resistance.
The utility model compared with prior art, the beneficial effect is that:
The pressure stabilizing control protection electric circuit combined in the present invention by low pressure voltage-stablizer and metal-oxide-semiconductor, can be effectively
Low-voltage over is carried out to battery core, prevents battery core after low-voltage since overdischarge causes the battery core service life to be affected
The problem of even battery core can not charge, so as to effectively carry out battery protection, reduce power consumption and cost.Pass through the utility model
It can overcome the problems, such as that the low-voltage variation voltage of existing battery core protection IC is fixed value and can not change, it can be according to practical feelings
The characteristic of condition and battery core adjusts blanking voltage.Make overall cost cheap by the utility model, is suitble to volume production and electricity
Road is ingenious, and operating power consumption is relatively low.
Detailed description of the invention
Fig. 1 is the electrical block diagram of the utility model.
Specific embodiment
The technical solution of the utility model, but the protection scope of the utility model are described in further detail with reference to the accompanying drawing
It is not limited to as described below.
As shown in Figure 1, the utility model provides a kind of battery low-voltage protection circuit, including it is used for battery output VBAT
The metal-oxide-semiconductor Q1 of on-off control and the low pressure voltage-stablizer U1 for control, the input terminal of low pressure voltage-stablizer U1 are connect with external equipment
It is connect with enable end with battery output VBAT, the output end of low pressure voltage-stablizer U1 passes sequentially through the 4th resistance R4 and the 5th resistance
R5 is connect with ground wire, to form low pressure voltage-stablizer output control circuit by the 4th resistance R4 and the 5th resistance R5, output
End is connect by first resistor R1 with the grid of metal-oxide-semiconductor Q1, and the source electrode of metal-oxide-semiconductor Q1 is connect with battery output VBAT, metal-oxide-semiconductor Q1
Drain electrode connect with external equipment, the grid of metal-oxide-semiconductor Q1 passes sequentially through second resistance R2 and 3rd resistor R3 is connected with electric wire, from
And metal-oxide-semiconductor turn-on control circuit is formed by first resistor R1, second resistance R2 and 3rd resistor R3.
In the present embodiment, battery output VBAT is positive terminal.Low pressure voltage-stablizer U1 is low pressure difference linear voltage regulator, type
Number be SOT23-5 or SGM2028-3.3.
The input terminal of low pressure voltage-stablizer U1 also passes through third capacitor C3 and connect with ground wire.Third capacitor C3 is 4.7uF.Low pressure
The input terminal of voltage-stablizer U1 is connect by first capacitor C1 with ground wire.First capacitor C1 is 2.2uF.The drain electrode of metal-oxide-semiconductor Q1 passes through
Second capacitor C2 is connect with ground wire.Second capacitor C2 is 2.2uF.Pass through first capacitor C1, the second capacitor C2 and third capacitor C3
It being capable of limited guarantee work and the detection steady point of voltage.
4th resistance R4 and the 5th resistance R5 is 100k Ω.First resistor R1 is 100k Ω, and second resistance R2 is 300k
Ω, 3rd resistor R3 are 200k Ω.In addition, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4 and the 5th
The resistance of resistance R5 can be set according to the size of cell voltage, to adapt to different protection circuits.
In the present embodiment, the on-off of metal-oxide-semiconductor Q1 depends on the voltage difference Vgs between the source electrode and drain electrode of metal-oxide-semiconductor Q1, and
The on state threshold voltage of metal-oxide-semiconductor Q1 is 0.9V, by controlling Vgs > 0.9V, metal-oxide-semiconductor Q1 conducting, the operation of complete machine power supply system；Vgs
Then metal-oxide-semiconductor Q1 is completely switched off by < 0.8V, and complete machine is for being electrically turn off.After this circuit connects battery core, low pressure voltage-stablizer U1 output setting
Voltage value, by partial pressure after metal-oxide-semiconductor Q1 grid voltage and battery voltage determine metal-oxide-semiconductor Q1 on and off to
Control the cut-off electric discharge of battery.The output voltage of its mesolow voltage-stablizer U1 and the grid voltage of metal-oxide-semiconductor Q1 can pass through resistance
Different values is set, so that different battery core ending discharge voltage values be arranged.Wherein first resistor R1, second resistance R2, third
Resistance R3 is used to adjust the grid voltage of metal-oxide-semiconductor Q1；4th resistance R4 and the 5th resistance R5 is for adjusting low pressure voltage-stablizer U1's
Output voltage.
As in the present embodiment, low pressure voltage-stablizer U1 output voltage is 3.3V, as long as battery output VBAT voltage is greater than
The output voltage of 3.3V, low pressure voltage-stablizer U1 can reach 3.3V, and the grid voltage that metal-oxide-semiconductor Q1 is then arranged is 3.3*
(500)/(600)=2.75V；2.75+0.9=3.65V, being higher than 3.65V or more voltage in battery just can open metal-oxide-semiconductor Q1, be
System normal power supply；The grid voltage of metal-oxide-semiconductor Q1 is 2.75+0.8=3.55V when low-voltage, and cell voltage is lower than 3.55V, metal-oxide-semiconductor
Q1 cut-off, cell cutoff are equipment power supply.So can be by the way that the output voltage of low pressure voltage-stablizer U1 and the grid of metal-oxide-semiconductor Q1 be arranged
The discharge cut-off voltage of pole tension setting battery core.In addition, the present embodiment mesolow voltage-stablizer U1 power consumption when zero load is only
115uA, power consumption are very low.
Above are merely preferred embodiments of the utility model, it should be understood that the utility model is not limited to be draped over one's shoulders herein
The form of dew, should not be regarded as an exclusion of other examples, and can be used for other combinations, modifications, and environments, and can
In this paper contemplated scope, modifications can be made through the above teachings or related fields of technology or knowledge.And those skilled in the art institute into
Capable modifications and changes do not depart from the spirit and scope of the utility model, then all should be in the guarantor of the appended claims for the utility model
It protects in range.
Claims (10)
1. a kind of battery low-voltage protection circuit, including connecting on-off control with external equipment for battery output (VBAT)
Metal-oxide-semiconductor (Q1) and low pressure voltage-stablizer (U1) for control, which is characterized in that the input terminal of the low pressure voltage-stablizer (U1) and make
Can end connect with battery output (VBAT), the output end of the low pressure voltage-stablizer (U1) passes sequentially through the 4th resistance (R4) and the
Five resistance (R5) are connect with ground wire, to form the output control of low pressure voltage-stablizer by the 4th resistance (R4) and the 5th resistance (R5)
Circuit, the output end are connect by first resistor (R1) with the grid of metal-oxide-semiconductor (Q1), the source electrode of the metal-oxide-semiconductor (Q1) and
Battery output (VBAT) connection, the drain electrode of the metal-oxide-semiconductor (Q1) connect with external equipment, the grid of the metal-oxide-semiconductor (Q1) according to
It is secondary to be connected with electric wire by second resistance (R2) and 3rd resistor (R3), to pass through first resistor (R1), second resistance (R2)
Metal-oxide-semiconductor turn-on control circuit is formed with 3rd resistor (R3).
2. a kind of battery low-voltage protection circuit according to claim 1, which is characterized in that the low pressure voltage-stablizer (U1)
Input terminal also passes through third capacitor (C3) and connect with ground wire.
3. a kind of battery low-voltage protection circuit according to claim 2, which is characterized in that the third capacitor (C3) is
4.7uF。
4. a kind of battery low-voltage protection circuit according to claim 1, which is characterized in that the low pressure voltage-stablizer (U1)
Input terminal is connect by first capacitor (C1) with ground wire.
5. a kind of battery low-voltage protection circuit according to claim 4, which is characterized in that the first capacitor (C1) is
2.2uF。
6. a kind of battery low-voltage protection circuit according to claim 1, which is characterized in that the drain electrode of the metal-oxide-semiconductor (Q1)
It is connect by the second capacitor (C2) with ground wire.
7. a kind of battery low-voltage protection circuit according to claim 6, which is characterized in that second capacitor (C2) is
2.2uF。
8. a kind of battery low-voltage protection circuit according to claim 1, which is characterized in that the 4th resistance (R4) and
Five resistance (R5) are 100k Ω.
9. a kind of battery low-voltage protection circuit according to claim 1, which is characterized in that the first resistor (R1) is
100k Ω, the second resistance (R2) are 300k Ω, and the 3rd resistor (R3) is 200k Ω.
10. a kind of battery low-voltage protection circuit according to claim 1, which is characterized in that the low pressure voltage-stablizer (U1)
Empty foot connect with the connecting pin of the 4th resistance (R4) and the 5th resistance (R5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920165555.XU CN209298949U (en) | 2019-01-30 | 2019-01-30 | A kind of battery low-voltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920165555.XU CN209298949U (en) | 2019-01-30 | 2019-01-30 | A kind of battery low-voltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209298949U true CN209298949U (en) | 2019-08-23 |
Family
ID=67642519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920165555.XU Active CN209298949U (en) | 2019-01-30 | 2019-01-30 | A kind of battery low-voltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209298949U (en) |
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2019
- 2019-01-30 CN CN201920165555.XU patent/CN209298949U/en active Active
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Address after: 511356 Room 501, building 2, No. 63, Yong'an Avenue, Huangpu District, Guangzhou, Guangdong Patentee after: Guangzhou lubangtong Internet of things Technology Co.,Ltd. Address before: 510653 3rd floor, building F, kehuiyuan, 95 Daguan Road, Tianhe District, Guangzhou City, Guangdong Province Patentee before: GUANGZHOU ROBUSTEL TECHNOLOGIES Co.,Ltd. |