CN111934287A - Battery protection circuit - Google Patents

Battery protection circuit Download PDF

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Publication number
CN111934287A
CN111934287A CN202010762452.9A CN202010762452A CN111934287A CN 111934287 A CN111934287 A CN 111934287A CN 202010762452 A CN202010762452 A CN 202010762452A CN 111934287 A CN111934287 A CN 111934287A
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CN
China
Prior art keywords
switching element
resistor
battery
series
source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010762452.9A
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Chinese (zh)
Inventor
杨小兵
林建良
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Foshan Shunde Guangyuda Power Supply Co
Original Assignee
Foshan Shunde Guangyuda Power Supply Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Foshan Shunde Guangyuda Power Supply Co filed Critical Foshan Shunde Guangyuda Power Supply Co
Priority to CN202010762452.9A priority Critical patent/CN111934287A/en
Publication of CN111934287A publication Critical patent/CN111934287A/en
Priority to CN202011565967.6A priority patent/CN112510652B/en
Priority to PCT/CN2021/106457 priority patent/WO2022022291A1/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0034—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using reverse polarity correcting or protecting circuits

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

A battery protection circuit comprises a switch element and a resistor which are connected with the anode or the cathode of a power supply, wherein the switch element and the resistor are respectively provided with more than one, the switch element comprises a switch element Q1, a switch element Q2 and a switch element Q3, the switch element Q3 is connected with the resistor in series, and the switch element Q3 and the resistor are connected with the switch element Q2 in parallel; alternatively, the switching element Q3, a resistor and the switching element Q1 are connected in parallel, one end of the grid of the switching element Q1 is provided with a first access terminal G1 for detecting the battery, the grid of the switching element Q1 is electrically connected with the first access terminal G1, one end of the grid of the switching element Q2 is provided with a second access terminal G2 for connecting the battery circuit, and the grid of the switching element Q2 is electrically connected with the second access terminal G2. The invention effectively prevents the battery from being reversely connected with larger current, prevents the output of short-circuit large current and prevents the current of the battery from reversely flowing; the limit stress of the output switch element is reduced, and the control drive of the battery detection is simplified.

Description

Battery protection circuit
Technical Field
The invention relates to the technical field of electronics, in particular to a protection circuit.
Background
Referring to fig. 5, the circuit uses a single signal, cannot be isolated alone under non-isolated drive, switches S2 and R0 are connected in series, both of which are connected in parallel with switch S1, when switch S1 is open, switch S2 is closed to precharge the motor M load, and switches S2, S1 are non-directional relays.
Referring to fig. 6, the circuit uses two signals DHG and DSG, but the circuit does not have a current limiting function, and measuring the battery voltage after switching can cause leakage of the battery, and after measuring the voltage by the resistance on the battery, the battery power can slowly leak through the resistance as the battery is stored.
Disclosure of Invention
The invention aims to provide a battery protection device which can effectively prevent a battery from being reversely connected with a larger current, prevent a large current from being output in a short circuit and prevent the current of the battery from flowing backwards; the limit stress of the output switch element is reduced, and a battery protection circuit for controlling and driving the battery detection is simplified, so that the defects in the prior art are overcome.
The battery protection circuit designed according to the purpose comprises a switch element and a resistor which are connected with the anode or the cathode of a power supply, wherein the switch element and the resistor are respectively provided with more than one, and the switch element is an N-MOS (N-metal oxide semiconductor) transistor, a P-MOS transistor or a BJT (bipolar junction transistor); the switching element comprises a switching element Q1, a switching element Q2 and a switching element Q3, wherein the switching element Q3 is connected with a resistor in series, and the switching element Q3 and the resistor are connected with the switching element Q2 in parallel; alternatively, the switching element Q3, a resistor and the switching element Q1 are connected in parallel, one end of the grid of the switching element Q1 is provided with a first access terminal G1 for detecting the battery, the grid of the switching element Q1 is electrically connected with the first access terminal G1, one end of the grid of the switching element Q2 is provided with a second access terminal G2 for connecting the circuit of the battery, and the grid of the switching element Q2 is electrically connected with the second access terminal G2 to form two separated signals.
The resistor comprises a resistor R1 and a resistor R2, one end of the resistor R1, a drain of a switching element Q1, a source of the switching element Q1, a source of the switching element Q2, a drain of the switching element Q2 and a negative electrode of the battery are sequentially and electrically connected in series to form a series circuit, the drain of the switching element Q3 is connected with one end of the resistor R2, and the other end of the resistor R2 is connected to a circuit path formed by the series circuit between the drain of the switching element Q2 and the negative electrode of the battery; the source of the switching element Q3 is connected in the series circuit path between the source of the switching element Q1 and the source of the switching element Q2, and the gate of the switching element Q3 is connected in the electrical connection path between the gate of the switching element Q1 and the first access terminal G1. So that the current flowing to the switching element Q1 flows along the switching element Q3 and the resistor R2 across the switching element Q2 and the second connection terminal G2 to the negative electrode of the battery.
The battery charging circuit also comprises a transformer T, a rectifier D1 and a capacitor C, wherein the other end of the resistor R1, the transformer T, the rectifier D1 and the anode of the battery are electrically connected in series in sequence; capacitor C is connected at one end to the series circuit path between rectifier D1 and the battery positive terminal. The other end of the capacitor C is connected to a circuit path connected in series between the other end of the resistor R1 and the transformer T.
The battery charging system also comprises a transformer T and a rectifier D1, wherein the resistor comprises a resistor R1 and a resistor R2, one end of the resistor R1, the transformer T, the rectifier D1, a drain of a switching element Q1, a source of a switching element Q1, a source of a switching element Q2, a drain of the switching element Q2 and a positive electrode of the battery are sequentially electrically connected and form a series connection; the other end of the resistor R1 is electrically connected with the negative electrode of the battery and is connected in series; the drain of the switching element Q3 is connected with one end of a resistor R2, and the other end of the resistor R2 is connected to a circuit path in series between the drain of the switching element Q2 and the positive electrode of the battery; the source of the switching element Q3 is connected in the series circuit path between the source of the switching element Q1 and the source of the switching element Q2, and the gate of the switching element Q3 is connected in the electrical connection path between the gate of the switching element Q1 and the first access terminal G1.
The circuit further comprises a capacitor C, wherein one end of the capacitor C is connected to a circuit path which is connected between the rectifier D1 and the drain electrode of the switching element Q1 in series; the other end of the capacitor C is connected to a circuit path connected in series between the other end of the resistor R1 and the transformer T.
The resistor comprises a resistor R1 and a resistor R2, one end of the resistor R1 is electrically connected with the source of the switching element Q1, the drain of the switching element Q1, the drain of the switching element Q2, the source of the switching element Q2 and the negative electrode of the battery in sequence to form series connection; the drain of the switching element Q3 is connected with one end of a resistor R2, and the other end of the resistor R2 is connected with a circuit path which is connected between the source of the switching element Q2 and the cathode of the battery in series; the source of the switching element Q3 is connected to a circuit path in series between one end of the resistor R1 and the source of the switching element Q1; the gate of the switching element Q3 is connected to a circuit path electrically connecting the gate of the switching element Q2 and the second input terminal G2.
The battery charging circuit also comprises a transformer T, a rectifier D1 and a capacitor C, wherein the other end of the resistor R1, the transformer T, the rectifier D1 and the anode of the battery are electrically connected in series in sequence; capacitor C is connected at one end to the series circuit path between rectifier D1 and the battery positive terminal. The other end of the capacitor C is connected to a circuit path connected in series between the other end of the resistor R1 and the transformer T.
The battery charging system also comprises a transformer T and a rectifier D1, wherein the resistor comprises a resistor R1 and a resistor R2, one end of the resistor R1 is electrically connected with the transformer T, the rectifier D1, a source of a switching element Q1, a drain of a switching element Q1, a drain of the switching element Q1, a drain of the switching element Q2, a source of a switching element Q2 and a positive electrode of the battery in series; the drain of the switching element Q3 is connected to one end of a resistor R2, and the other end of the resistor R2 is connected to a circuit path formed by connecting the drain of the switching element Q1 and the drain of the switching element Q2 in series; the source of the switching element Q3 is connected in the circuit path in series between the rectifier D1 and the source of the switching element Q1; the gate of the switching element Q3 is connected to a circuit path electrically connecting the gate of the switching element Q2 and the second connection terminal G2; the other end of the resistor R1 is electrically connected to the negative electrode of the battery and is connected in series.
The circuit further comprises a capacitor C, wherein one end of the capacitor C is connected to a circuit path which is connected between the rectifier D1 and the source electrode of the switching element Q1 in series; the other end of the capacitor C is connected to a circuit path connected in series between the other end of the resistor R1 and the transformer T.
The invention has the following beneficial effects: two separate signals, one for detecting the battery (first input terminal G1) and the other for connecting to the battery or load (second input terminal G2) after safety. When the battery is reversely connected, the negative voltage is small, the reverse current is limited by the resistor R1 to protect the switching element Q1, the switching element Q3 and the switching element Q2, when the battery is correctly connected, the reverse current can be grounded through a part of the voltage resistor, the current of the battery can pass through the resistor R1 along with the storage time, and the switching element Q1 can block the current to prevent the battery from leaking electricity due to the long-time storage, so that the battery does not have any electric quantity.
In conclusion, the invention effectively prevents the battery from being reversely connected with larger current, prevents the output of short-circuit large current and prevents the current of the battery from flowing backwards; the limit stress of the output switch element is reduced, and the control drive of the battery detection is simplified.
Drawings
Fig. 1 is a structural view of a battery protection circuit according to a first embodiment of the present invention.
Fig. 2 is a structural diagram of a battery protection circuit according to a second embodiment of the present invention.
Fig. 3 is a diagram illustrating a battery protection circuit according to a third embodiment of the present invention.
Fig. 4 is a diagram illustrating a battery protection circuit according to a fourth embodiment of the present invention.
Fig. 5 and 6 are schematic diagrams of a battery detection circuit in the prior art.
Detailed Description
The invention is further described with reference to the following figures and examples.
First embodiment
Referring to fig. 1, a battery protection circuit includes a capacitor C connected to a positive electrode of a battery, a rectifier D1, a transformer T, a switching element Q1, a switching element Q2, a switching element Q3, a resistor R1 and a resistor R2, wherein a connection pin of the switching element Q3 is connected in series with the resistor R2, and the two are connected in parallel with the switching element Q2, wherein a first connection terminal G1 for detecting the battery is provided at one end of a gate of the switching element Q1, a gate of the switching element Q1 is electrically connected to the first connection terminal G1, a second connection terminal G2 for connecting a battery circuit is provided at one end of a gate of the switching element Q2, and a gate of the switching element Q2 is electrically connected to the second connection terminal G2.
One end of the resistor R1, the drain of the switching element Q1, the source of the switching element Q1, the source of the switching element Q2, the drain of the switching element Q2 and the negative electrode of the battery are electrically connected in series in this order.
The drain of the switching element Q3 is connected to one end of a resistor R2, and the other end of the resistor R2 is connected to a circuit path formed by connecting the drain of the switching element Q2 and the negative electrode of the battery in series.
The source of the switching element Q3 is connected in the series circuit path between the source of the switching element Q1 and the source of the switching element Q2, and the gate of the switching element Q3 is connected in the electrical connection path between the gate of the switching element Q1 and the first access terminal G1. So that the current flowing to the switching element Q1 flows along the switching element Q3 and the resistor R2 across the switching element Q2 and the second connection terminal G2 to the negative electrode of the battery.
The other end of the resistor R1, the transformer T, the rectifier D1 and the anode of the battery are electrically connected in sequence and form a series connection.
Capacitor C is connected at one end to the series circuit path between rectifier D1 and the battery positive terminal.
The other end of the capacitor C is connected to a circuit path connected in series between the other end of the resistor R1 and the transformer T.
When the battery is stored for a long time, the switching element Q1, the switching element Q3 and the switching element Q2 are all turned off, and the reverse leakage current of the battery is blocked. When the battery state is detected, the battery voltage can be detected from the capacitor C. The switching element Q1 and the switching element Q3 need to be turned on first, but the switching element Q2 is turned off. If the battery connection direction is correct and the positive electrode voltage can be determined, the switching element Q1, the switching element Q3, and the switching element Q2 can all be turned on. When the battery is connected in reverse, the negative voltage should be small because the transformer T and the rectifier D1 are forward. The reverse current will be limited by the resistor R1 to protect all of the switching element Q1, the switching element Q3, and the switching element Q2. The switching elements Q1 and Q3 can open the small pulse for checking. The switching element Q1, the switching element Q3 and the switching element Q2 can be changed from N-MOS transistors to P-MOS transistors or BJT transistors.
The invention is characterized by two separated signals, one is used for detecting the battery (the first access terminal G1), and the other is connected with the battery or the load (the second access terminal G2) after the safety.
When the battery is reversely connected, the negative voltage is small, and the reverse current is limited by the resistor R1 to protect the switching element Q1, the switching element Q3, and the switching element Q2.
When the battery is connected correctly, the reverse current will pass through the partial voltage resistor to ground, the current of the battery will pass through the resistor R1 with the storage time, and the switch element Q1 will block the current, so as to prevent the battery from leaking electricity due to the long-time storage, and the battery has no electric quantity.
Second embodiment
Referring to fig. 2, a battery protection circuit is different from the first embodiment in that, with the gate of the switching element Q1 electrically connected to the first input terminal G1 and the gate of the switching element Q2 electrically connected to the second input terminal G2 unchanged:
one end of the resistor R1, the transformer T, the rectifier D1, the drain of the switching element Q1, the source of the switching element Q1, the source of the switching element Q2, the drain of the switching element Q2, and the positive electrode of the battery are electrically connected in series.
The other end of the resistor R1 is electrically connected to the negative electrode of the battery and is connected in series.
The drain of the switching element Q3 is connected to one end of a resistor R2, and the other end of the resistor R2 is connected to a circuit path formed by connecting the drain of the switching element Q2 and the positive electrode of the battery in series.
The source of the switching element Q3 is connected in the series circuit path between the source of the switching element Q1 and the source of the switching element Q2, and the gate of the switching element Q3 is connected in the electrical connection path between the gate of the switching element Q1 and the first access terminal G1.
One end of the capacitor C is connected to a circuit path connected in series between the rectifier D1 and the drain of the switching element Q1.
The other end of the capacitor C is connected to a circuit path connected in series between the other end of the resistor R1 and the transformer T.
Other parts not described are the same as those of the first embodiment, and are not described in detail here.
Third embodiment
Referring to fig. 3, a battery protection circuit is different from the first embodiment in that, with the gate of the switching element Q1 electrically connected to the first input terminal G1 and the gate of the switching element Q2 electrically connected to the second input terminal G2 unchanged: one end of the resistor R1 is electrically connected in series with the source of the switching element Q1, the drain of the switching element Q1, the drain of the switching element Q2, the source of the switching element Q2, and the negative electrode of the battery in this order.
The drain of the switching element Q3 is connected to one end of a resistor R2, and the other end of the resistor R2 is connected to a circuit path formed by connecting the source of the switching element Q2 and the negative electrode of the battery in series.
The source of the switching element Q3 is connected to a circuit path in series between one end of the resistor R1 and the source of the switching element Q1.
The gate of the switching element Q3 is connected to a circuit path electrically connecting the gate of the switching element Q2 and the second input terminal G2.
Capacitor C is connected at one end to the series circuit path between rectifier D1 and the battery positive terminal.
The other end of the capacitor C is connected to a circuit path connected in series between the other end of the resistor R1 and the transformer T.
Other parts not described are the same as those of the first embodiment, and are not described in detail here.
Fourth embodiment
Referring to fig. 4, a battery protection circuit is different from the first embodiment in that, with the gate of the switching element Q1 electrically connected to the first input terminal G1 and the gate of the switching element Q2 electrically connected to the second input terminal G2 unchanged: one end of the resistor R1 is electrically connected in series with the transformer T, the rectifier D1, the source of the switching element Q1, the drain of the switching element Q1, the drain of the switching element Q1, the drain of the switching element Q2, the source of the switching element Q2, and the positive electrode of the battery in this order.
The drain of the switching element Q3 is connected to one end of a resistor R2, and the other end of the resistor R2 is connected to a circuit path formed by connecting the drain of the switching element Q1 and the drain of the switching element Q2 in series.
The source of the switching element Q3 is connected in the series circuit path between the rectifier D1 and the source of the switching element Q1.
The gate of the switching element Q3 is connected to a circuit path electrically connecting the gate of the switching element Q2 and the second input terminal G2.
The other end of the resistor R1 is electrically connected to the negative electrode of the battery and is connected in series.
One end of the capacitor C is connected to a circuit path connected in series between the rectifier D1 and the source of the switching element Q1.
The other end of the capacitor C is connected to a circuit path connected in series between the other end of the resistor R1 and the transformer T.
Other parts not described are the same as those of the first embodiment, and are not described in detail here.
The foregoing is a preferred embodiment of the present invention, and the basic principles, principal features and advantages of the invention are shown and described. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and the invention is intended to be protected by the following claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (9)

1. The utility model provides a battery protection circuit, is including connecting switching element, the resistance on power positive pole or negative pole, and switching element, resistance are equipped with more than one respectively, its characterized in that: the switch element is an N-MOS tube, a P-MOS tube or a BJT tube; the switching element comprises a switching element Q1, a switching element Q2 and a switching element Q3, wherein the switching element Q3 is connected with a resistor in series, and the switching element Q3 and the resistor are connected with the switching element Q2 in parallel; alternatively, the switching element Q3, a resistor and the switching element Q1 are connected in parallel, one end of the grid of the switching element Q1 is provided with a first access terminal G1 for detecting the battery, the grid of the switching element Q1 is electrically connected with the first access terminal G1, one end of the grid of the switching element Q2 is provided with a second access terminal G2 for connecting the circuit of the battery, and the grid of the switching element Q2 is electrically connected with the second access terminal G2 to form two separated signals.
2. The battery protection circuit of claim 1, wherein: the resistor comprises a resistor R1 and a resistor R2, one end of the resistor R1, a drain of a switching element Q1, a source of the switching element Q1, a source of the switching element Q2, a drain of the switching element Q2 and a negative electrode of the battery are sequentially and electrically connected in series to form a series circuit, the drain of the switching element Q3 is connected with one end of the resistor R2, and the other end of the resistor R2 is connected to a circuit path formed by the series circuit between the drain of the switching element Q2 and the negative electrode of the battery; the source of the switching element Q3 is connected to the circuit path in series between the source of the switching element Q1 and the source of the switching element Q2, and the gate of the switching element Q3 is connected to the electrical connection path between the gate of the switching element Q1 and the first access terminal G1; so that the current flowing to the switching element Q1 flows along the switching element Q3 and the resistor R2 across the switching element Q2 and the second connection terminal G2 to the negative electrode of the battery.
3. The battery protection circuit of claim 2, wherein: the battery charging circuit also comprises a transformer T, a rectifier D1 and a capacitor C, wherein the other end of the resistor R1, the transformer T, the rectifier D1 and the anode of the battery are electrically connected in series in sequence; one end of the capacitor C is connected to a circuit path which is connected between the rectifier D1 and the anode of the battery in series; the other end of the capacitor C is connected to a circuit path connected in series between the other end of the resistor R1 and the transformer T.
4. The battery protection circuit of claim 1, wherein: the battery charging system also comprises a transformer T and a rectifier D1, wherein the resistor comprises a resistor R1 and a resistor R2, one end of the resistor R1, the transformer T, the rectifier D1, a drain of a switching element Q1, a source of a switching element Q1, a source of a switching element Q2, a drain of the switching element Q2 and a positive electrode of the battery are sequentially electrically connected and form a series connection; the other end of the resistor R1 is electrically connected with the negative electrode of the battery and is connected in series; the drain of the switching element Q3 is connected with one end of a resistor R2, and the other end of the resistor R2 is connected to a circuit path in series between the drain of the switching element Q2 and the positive electrode of the battery; the source of the switching element Q3 is connected in the series circuit path between the source of the switching element Q1 and the source of the switching element Q2, and the gate of the switching element Q3 is connected in the electrical connection path between the gate of the switching element Q1 and the first access terminal G1.
5. The battery protection circuit of claim 4, wherein: the circuit further comprises a capacitor C, wherein one end of the capacitor C is connected to a circuit path which is connected between the rectifier D1 and the drain electrode of the switching element Q1 in series; the other end of the capacitor C is connected to a circuit path connected in series between the other end of the resistor R1 and the transformer T.
6. The battery protection circuit of claim 1, wherein: the resistor comprises a resistor R1 and a resistor R2, one end of the resistor R1 is electrically connected with the source of the switching element Q1, the drain of the switching element Q1, the drain of the switching element Q2, the source of the switching element Q2 and the negative electrode of the battery in sequence to form series connection; the drain of the switching element Q3 is connected with one end of a resistor R2, and the other end of the resistor R2 is connected with a circuit path which is connected between the source of the switching element Q2 and the cathode of the battery in series; the source of the switching element Q3 is connected to a circuit path in series between one end of the resistor R1 and the source of the switching element Q1; the gate of the switching element Q3 is connected to a circuit path electrically connecting the gate of the switching element Q2 and the second input terminal G2.
7. The battery protection circuit of claim 6, wherein: the battery charging circuit also comprises a transformer T, a rectifier D1 and a capacitor C, wherein the other end of the resistor R1, the transformer T, the rectifier D1 and the anode of the battery are electrically connected in series in sequence; one end of the capacitor C is connected to a circuit path which is connected between the rectifier D1 and the anode of the battery in series; the other end of the capacitor C is connected to a circuit path connected in series between the other end of the resistor R1 and the transformer T.
8. The battery protection circuit of claim 1, wherein: the battery charging system also comprises a transformer T and a rectifier D1, wherein the resistor comprises a resistor R1 and a resistor R2, one end of the resistor R1 is electrically connected with the transformer T, the rectifier D1, a source of a switching element Q1, a drain of a switching element Q1, a drain of the switching element Q1, a drain of the switching element Q2, a source of a switching element Q2 and a positive electrode of the battery in series; the drain of the switching element Q3 is connected to one end of a resistor R2, and the other end of the resistor R2 is connected to a circuit path formed by connecting the drain of the switching element Q1 and the drain of the switching element Q2 in series; the source of the switching element Q3 is connected in the circuit path in series between the rectifier D1 and the source of the switching element Q1; the gate of the switching element Q3 is connected to a circuit path electrically connecting the gate of the switching element Q2 and the second connection terminal G2; the other end of the resistor R1 is electrically connected to the negative electrode of the battery and is connected in series.
9. The battery protection circuit of claim 8, wherein: the circuit further comprises a capacitor C, wherein one end of the capacitor C is connected to a circuit path which is connected between the rectifier D1 and the source electrode of the switching element Q1 in series; the other end of the capacitor C is connected to a circuit path connected in series between the other end of the resistor R1 and the transformer T.
CN202010762452.9A 2020-07-31 2020-07-31 Battery protection circuit Pending CN111934287A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202010762452.9A CN111934287A (en) 2020-07-31 2020-07-31 Battery protection circuit
CN202011565967.6A CN112510652B (en) 2020-07-31 2020-12-25 Battery charging circuit, charging device and electronic device
PCT/CN2021/106457 WO2022022291A1 (en) 2020-07-31 2021-07-15 Battery charging circuit, charging device, and electronic device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010762452.9A CN111934287A (en) 2020-07-31 2020-07-31 Battery protection circuit

Publications (1)

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CN111934287A true CN111934287A (en) 2020-11-13

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Application Number Title Priority Date Filing Date
CN202010762452.9A Pending CN111934287A (en) 2020-07-31 2020-07-31 Battery protection circuit

Country Status (1)

Country Link
CN (1) CN111934287A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022022291A1 (en) * 2020-07-31 2022-02-03 佛山市顺德区冠宇达电源有限公司 Battery charging circuit, charging device, and electronic device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022022291A1 (en) * 2020-07-31 2022-02-03 佛山市顺德区冠宇达电源有限公司 Battery charging circuit, charging device, and electronic device

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Application publication date: 20201113