CN213521352U - Battery reverse connection prevention circuit - Google Patents
Battery reverse connection prevention circuit Download PDFInfo
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- CN213521352U CN213521352U CN202022510195.8U CN202022510195U CN213521352U CN 213521352 U CN213521352 U CN 213521352U CN 202022510195 U CN202022510195 U CN 202022510195U CN 213521352 U CN213521352 U CN 213521352U
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- battery
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- mos tube
- pin
- reverse connection
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Abstract
The utility model discloses a battery prevents reverse-connection circuit, including control IC UP1, MOS pipe QP1 and MOS pipe QP2, the input of battery with control IC UP 1's BATT pin and MOS pipe QP 2's source connection, control IC UP 1's BGATE pin respectively with MOS pipe QP 2's drain electrode and MOS pipe QP 1's gate are connected, MOS pipe QP 2's gate is through resistance RP1 ground connection, MOS pipe QP 1's source with MOS pipe QP 2's source connection, MOS pipe QP 1's drain electrode is connected to the output. The utility model provides high portable electronic product's reliability.
Description
Technical Field
The utility model relates to a battery power supply technical field, especially a reverse connection circuit is prevented to battery.
Background
At present, portable electronic products are more in the market, and the power supply mode of the portable electronic products generally adopts the power supply mode of an adapter and a lithium battery. The lithium battery has a reverse insertion condition during production operation, and the power supply of the portable electronic product has a reverse condition at the moment, so that a rear-stage circuit is damaged.
SUMMERY OF THE UTILITY MODEL
For solving the problem that exists among the prior art, the utility model aims at providing a battery prevents reverse connection circuit, the utility model provides the high reliability of portable electronic product.
In order to achieve the above object, the utility model adopts the following technical scheme: a battery reverse connection prevention circuit comprises a control IC UP1, a MOS tube QP1 and a MOS tube QP2, wherein the input end of a battery is connected with a BATT pin of the control IC UP1 and the source electrode of the MOS tube QP2, the BGATE pin of the control IC UP1 is respectively connected with the drain electrode of the MOS tube QP2 and the grid electrode of the MOS tube QP1, the grid electrode of the MOS tube QP2 is grounded through a resistor RP1, the source electrode of the MOS tube QP1 is connected with the source electrode of the MOS tube QP2, and the drain electrode of the MOS tube QP1 is connected with the output end.
As a further improvement of the present invention, MOS pipe QP1 and MOS pipe QP2 are N-channel switch MOS pipes.
As a further improvement of the present invention, the input end of the battery is connected with an input capacitor CP1 for filtering the input voltage.
As a further improvement of the present invention, a resistor RP3 is connected between the input terminal of the battery and the BATT pin of the control IC UP 1.
As a further improvement of the present invention, a resistor RP2 is connected between the BGATE pin of the control IC UP1 and the gate of the MOS transistor QP 1.
As a further improvement of the present invention, the output end is connected with a load capacitor CP1 and a load capacitor CP2, and the load capacitor CP2 and the load capacitor CP3 are connected in parallel.
The utility model has the advantages that:
the utility model provides a reverse connection circuit is prevented to battery through simple circuit structure, prevents that the reverse power supply of lithium cell from burning out the back stage circuit, improves portable electronic product reliability.
Drawings
Fig. 1 is a circuit structure diagram of an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Examples
As shown in fig. 1, an anti-reverse connection circuit for a battery includes a control IC UP1, a MOS transistor QP1 and a MOS transistor QP2, an input end of the battery is connected to a BATT pin of the control IC UP1 and a source of the MOS transistor QP2, a BGATE pin of the control IC UP1 is connected to a drain of the MOS transistor QP2 and a gate of the MOS transistor QP1, a gate of the MOS transistor QP2 is grounded via a resistor RP1, a source of the MOS transistor QP1 is connected to a source of the MOS transistor QP2, and a drain of the MOS transistor QP1 is connected to an output end.
In this embodiment, the MOS transistor QP1 and the MOS transistor QP2 are both N-channel switching MOS transistors.
In this embodiment, an input capacitor CP1 for filtering the input voltage is connected to the input terminal of the battery.
In this embodiment, a resistor RP3 is connected between the input terminal of the battery and the BATT pin of the control IC UP 1.
In the present embodiment, a resistor RP2 is connected between the BGATE pin of the control IC UP1 and the gate of the MOS transistor QP 1.
In the present embodiment, the output terminal is connected to the load capacitor CP1 and the load capacitor CP2, and the load capacitor CP2 and the load capacitor CP3 are connected in parallel.
The principle of this embodiment is further explained below:
when the lithium battery is normally connected, the voltage of the lithium battery enters the control IC UP1 through the resistor RP3, and bootstrap voltage generated in the control IC UP1 is output through a 11-pin BGATE pin of the control IC; the gate voltage (0V) of the 1 st pin of the N-channel switch MOS transistor QP2 is less than the bootstrap output voltage (higher than the lithium battery voltage) of the 11 th pin BGATE pin of the control IC UP1, so the N-channel switch MOS transistor QP2 is in an off state; the output of the 11 th foot BGATE pin of the control IC UP1 of the N-channel switch MOS tube QP1 is higher than the input of a lithium battery, so that the lithium battery is in an open state, and the load capacitor CP2 and the load capacitor CP3 are normally supplied with power by the lithium battery.
When the lithium battery is reversely connected, the grid voltage (lithium battery voltage) of a pin 1 of the N-channel switch MOS tube QP2 is higher than the drain voltage (no bootstrap) of a pin 3 of the N-channel switch MOS tube QP2, so that the N-channel switch MOS tube QP2 is conducted, and a pin 11 BGATE of the control IC UP1 is connected to the ground; the 2 nd pin source voltage of the N-channel switch MOS tube QP2 is equal to the 2 nd pin source voltage of the N-channel switch MOS tube QP1 and the 11 th pin BGATE pin voltage of the control IC UP1, so that the N-channel switch MOS tube QP1 is in a turn-off state, the voltage of a lithium battery cannot supply power to a rear-stage circuit through the N-channel MOS tube QP1, and the purpose of protecting the rear-stage circuit is achieved.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is specific and detailed, but not 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.
Claims (6)
1. The battery anti-reverse connection circuit is characterized by comprising a control IC UP1, a MOS tube QP1 and a MOS tube QP2, wherein the input end of the battery is connected with a BATT pin of the control IC UP1 and the source electrode of the MOS tube QP2, the BGATE pin of the control IC UP1 is respectively connected with the drain electrode of the MOS tube QP2 and the gate electrode of the MOS tube QP1, the gate electrode of the MOS tube QP2 is grounded through a resistor RP1, the source electrode of the MOS tube QP1 is connected with the source electrode of the MOS tube QP2, and the drain electrode of the MOS tube QP1 is connected with the output end.
2. The battery reverse connection prevention circuit according to claim 1, wherein the MOS transistor QP1 and the MOS transistor QP2 are both N-channel switch MOS transistors.
3. The battery reverse connection prevention circuit according to claim 1, wherein an input capacitor CP1 for filtering an input voltage is connected to an input terminal of the battery.
4. The battery anti-reverse connection circuit of claim 1, wherein a resistor RP3 is connected between the input terminal of the battery and the BATT pin of the control IC UP 1.
5. The battery anti-reverse connection circuit as claimed in claim 1, wherein a resistor RP2 is connected between the BGATE pin of the control IC UP1 and the gate of the MOS transistor QP 1.
6. The battery reverse connection prevention circuit according to claim 1, wherein a load capacitor CP2 and a load capacitor CP3 are connected to the output terminal, and a load capacitor CP2 and a load capacitor CP3 are arranged in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022510195.8U CN213521352U (en) | 2020-11-03 | 2020-11-03 | Battery reverse connection prevention circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022510195.8U CN213521352U (en) | 2020-11-03 | 2020-11-03 | Battery reverse connection prevention circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213521352U true CN213521352U (en) | 2021-06-22 |
Family
ID=76420387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022510195.8U Active CN213521352U (en) | 2020-11-03 | 2020-11-03 | Battery reverse connection prevention circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213521352U (en) |
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2020
- 2020-11-03 CN CN202022510195.8U patent/CN213521352U/en active Active
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