CN215733609U - Multifunctional protection circuit of charging equipment - Google Patents
Multifunctional protection circuit of charging equipment Download PDFInfo
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- CN215733609U CN215733609U CN202122229549.6U CN202122229549U CN215733609U CN 215733609 U CN215733609 U CN 215733609U CN 202122229549 U CN202122229549 U CN 202122229549U CN 215733609 U CN215733609 U CN 215733609U
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Abstract
The utility model discloses a multifunctional protection circuit of charging equipment, and belongs to the technical field of charging protection circuits. The utility model monitors the voltage of the output end, when the output voltage or current is in the range specified by the design, the MOS normally switches on the output voltage and current, when the circuit is abnormal and the output voltage exceeds the preset voltage and current, the operation control circuit or the reverse connection protection circuit outputs the abnormal voltage, and the MOS tube is switched off and output, thereby effectively protecting the output end; the utility model adopts a single-operational logic circuit structure, removes a complex circuit device, can protect the charging equipment and the battery from overcharging the battery, preventing connection ignition, preventing the battery from being reversely connected to damage the circuit and preventing the circuit from being short-circuited.
Description
Technical Field
The utility model relates to the technical field of charging protection circuits, in particular to a multifunctional protection circuit of charging equipment.
Background
The development of electric energy is wider and wider, and the application of electric energy is more and more, so various situations can occur during the use of the charging device, for example: the battery is greatly damaged in a fluctuating circuit due to overcharge, connection ignition, reverse connection of the battery and short circuit of the circuit, the service life is shortened, and the capacity and the electric quantity of the battery are reduced; the integration level of the circuit board is higher and higher at present, the damage cost is higher and higher, and how to provide a stable working circuit environment for the charging equipment and the battery is a problem which needs to be solved urgently.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to a multifunctional protection circuit for a charging device, so as to solve the problems mentioned in the background art.
In order to solve the technical problems, the utility model provides the following technical scheme: the utility model provides a multi-functional protection circuit of battery charging outfit, includes power and battery, power one end is connected with the battery positive pole, the power other end is connected with the battery negative pole through short-circuit protection circuit, blocking circuit, the parallelly connected operation control circuit in power both ends, operation control circuit and short-circuit protection circuit, blocking circuit and the protection circuit that connects conversely are parallelly connected, the battery positive pole and the parallelly connected protection circuit that connects conversely of battery negative pole.
The arithmetic control circuit includes: operational amplifier U1A, resistor R8, power supply 2.5V, resistor R7, diode D2, resistor R3, diode D4, resistor R9, diode D3, resistor R5, resistor R6, resistor R10 and zener diode DZ 1;
the positive input end of the operational amplifier U1A is connected with a power supply by a resistor R8 for 2.5V, the power supply is connected with the cathode of a diode D2 after being connected with a resistor R7 in parallel by 2.5V, the anode of the diode D2 is connected with a reverse connection protection circuit, the anode of the diode D2 is connected with a resistor R3 in parallel, the other end of the resistor R3 is connected with the output end of the operational amplifier by a diode D4, one end of the resistor R3 connected with the diode D4 is connected with a blocking circuit in parallel, a resistor R9 and a diode D3 are connected between the positive input end of the operational amplifier and the output end of the operational amplifier in parallel, the negative output end of the operational amplifier U1A is connected with a resistor R5 and a resistor R6 in parallel, the other end of the resistor R5 is connected with the positive electrode of the power supply, the other end of the resistor R6 is grounded, one end of the resistor R6 is connected with a resistor R10 in parallel, the other end of the resistor R10 is connected with the operational amplifier U1A in parallel, the positive input end of the operational amplifier U1 is connected with the positive input end of the resistor R9 and the cathode of the zener diode DZ1, the anode of the voltage stabilizing diode DZ1 is connected with the end of the power supply connected with the short-circuit protection circuit and then grounded, and the end of the resistor R9 connected with the resistor R10 is connected with the short-circuit protection circuit in parallel.
The blocking circuit comprises an MOS tube Q2 and a resistor R4, the cathode of the battery is connected with the drain electrode of an MOS tube Q2, the source electrode of the MOS tube Q2 is connected with the grid electrode of the MOS tube Q2 through a resistor R4, one end of the grid electrode of the MOS tube Q2, which is connected with the resistor R4, is connected with the reverse connection protection circuit, and one end of the source electrode of the MOS tube Q2, which is connected with the resistor R4, is connected with the short-circuit protection circuit;
when the circuit is normal and the battery is charged, the resistor R5 and the resistor R6 are connected in series at the positive (+) negative (-) end of the battery to form a voltage dividing point E, the operational amplifier U1A is inverted along with the rise of the voltage of the battery when the voltage at the point E is higher than 1.25V, the output end of the operational amplifier U1A outputs low level, so that the MOS transistor Q2 loses bias voltage and is cut off, and the output is cut off to stop charging;
when the output is in a no-load state, the voltage at the point E is higher than 1.25V, the operational amplifier U1A is inverted, and the output end of the operational amplifier U1A outputs a low level, so that the MOS transistor Q2 loses bias, cuts off and turns off the output, and at the moment, even if the output end is connected with a connector or a short-circuit port, the output cannot be ignited.
The reverse connection protection circuit comprises a diode D1, a triode Q1, a resistor R1 and a resistor R2, wherein the positive electrode of the battery is connected with an emitter of the triode Q1 through a diode D1, the base of the triode Q1 is connected with the emitter through a resistor R1, one end of the base of the triode Q1, which is connected with a resistor R1, is connected with the resistor R2 in parallel and then is grounded, and the collector of the triode Q1 is connected with the operation control circuit; when the output end is connected with the battery in the positive (+) negative (-) direction in a reverse connection mode, the base electrode of the triode Q1 in the reverse connection protection circuit is cut off in the reverse direction of the bias current of the emitter electrode, the collector electrode has no voltage, and therefore the MOS tube Q2 loses the bias voltage and is cut off, and the reverse current is blocked to play a protection role.
The short-circuit protection circuit comprises a triode Q3 and a resistor RS1, wherein a collector of the triode Q3 is connected with the operation control circuit, a base of the triode Q3 is connected with an emitter of the triode Q3 through a resistor RS1, one end of the emitter of the triode Q3, which is connected with the resistor RS1, is connected with the operation control circuit in parallel, and one end of the collector of the triode Q3, which is connected with the resistor RS1, is connected with a blocking circuit in parallel; when the output end is short-circuited, the current of the resistor RS1 increases with time, the base voltage of the triode Q3 rises with the increase of the current, the base voltage of the triode Q3 rises to a conducting voltage, the triode Q3 is conducted, the output voltage of the positive output end of the operational amplifier U1A flows to the ground through the triode Q3, the voltage of the positive output end of the operational amplifier U1A is almost zero, the operational amplifier U1A inverts, the output end of the operational amplifier U1A outputs a low level, the voltage of the resistor R4 is reduced, the MOS transistor Q2 loses bias voltage and is cut off, and the cut-off output plays a role in short-circuit and overcurrent protection.
Compared with the prior art, the utility model has the following beneficial effects: when the voltage of the battery is charged to exceed the designed required voltage, the output is cut off to stop charging, so that the battery is prevented from being overcharged; when the charger is in an idle state, the output end is in an off state, and ignition cannot be generated when a battery is connected or a port is in short circuit; when the output end and the positive and negative electrodes of the battery end are accidentally connected in reverse, the MOS switch is turned off to block current input; when the output end is short-circuited, the current rises sharply, and when the current rises to a preset value, the MOS switch turns off the output, so that accidents caused by overcurrent heating are prevented; the whole circuit effectively protects the output end, adopts a circuit structure of single operational logic, removes a complex circuit device, effectively reduces circuit faults due to the multi-purpose core, and improves the working reliability of the circuit.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:
fig. 1 is a schematic diagram of a frame of a multifunctional protection circuit of a charging device according to the present invention;
fig. 2 is a schematic structural diagram of a multifunctional protection circuit of a charging device according to the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides the following technical solutions: a multifunctional protection circuit of charging equipment comprises a power supply and a battery, wherein one end of the power supply is connected with the positive electrode of the battery, the other end of the power supply is connected with the negative electrode of the battery through a short-circuit protection circuit and a blocking circuit, two ends of the power supply are connected with an operation control circuit in parallel, the operation control circuit is connected with the short-circuit protection circuit, the blocking circuit and a reverse connection protection circuit in parallel, and the positive electrode of the battery and the negative electrode of the battery are connected with the reverse connection protection circuit in parallel.
The arithmetic control circuit includes: operational amplifier U1A, resistor R8, power supply 2.5V, resistor R7, diode D2, resistor R3, diode D4, resistor R9, diode D3, resistor R5, resistor R6, resistor R10 and zener diode DZ 1;
the positive input end of an operational amplifier U1A is connected with a power supply by a resistor R8 at 2.5V, the power supply is connected with a diode D2 cathode after being connected with a resistor R7 in parallel at 2.5V, the anode of a diode D2 is connected with a reverse connection protection circuit, the anode of a diode D2 is connected with a resistor R3 in parallel, the other end of a resistor R3 is connected with the output end of the operational amplifier by a diode D4, one end of the resistor R3 connected with a diode D4 is connected with a blocking circuit in parallel, a resistor R9 and a diode D3 are connected between the positive input end of the operational amplifier and the output end of the operational amplifier in parallel, the negative output end of the operational amplifier U1A is connected with a resistor R5 and a resistor R6 in parallel, the other end of the resistor R5 is connected with the positive electrode of the power supply, the other end of the resistor R6 is grounded, one end of the resistor R6 is connected with a resistor R10 in parallel, the positive input end of the operational amplifier U1A is connected with the ground, the resistor R867 and the cathode of the zener diode DZ 3687458 is connected with the positive end of the operational amplifier U1, and the short-anode of the zener diode DZ1 is connected with the short-circuit, one end of the resistor R9 connected with the resistor R10 is connected with the short-circuit protection circuit in parallel.
The blocking circuit comprises an MOS tube Q2 and a resistor R4, the cathode of the battery is connected with the drain electrode of the MOS tube Q2, the source electrode of the MOS tube Q2 is connected with the grid electrode of the MOS tube Q2 through a resistor R4, the end, connected with the resistor R4, of the grid electrode of the MOS tube Q2 is connected with the reverse connection protection circuit, and the end, connected with the resistor R4, of the source electrode of the MOS tube Q2 is connected with the short-circuit protection circuit;
when the circuit is normal and the battery is charged, the resistor R5 and the resistor R6 are connected in series at the positive (+) negative (-) end of the battery to form a voltage dividing point E, along with the voltage rise of the battery, when the voltage at the point E is higher than 1.25V, the operational amplifier U1A is inverted, the output end of the operational amplifier U1A outputs low level, so that the MOS transistor Q2 loses bias voltage and is cut off, and the output is turned off to stop charging;
when the output is in a no-load state, the voltage at the point E is higher than 1.25V, the operational amplifier U1A is inverted, and the output end of the operational amplifier U1A outputs low level, so that the MOS transistor Q2 loses bias cut-off output, and even if the output end is connected with a connector or a short-circuit port, the output end cannot be ignited.
The reverse connection protection circuit comprises a diode D1, a triode Q1, a resistor R1 and a resistor R2, wherein the positive electrode of the battery is connected with an emitter of the triode Q1 through a diode D1, the base of the triode Q1 is connected with the emitter through a resistor R1, one end of the base of the triode Q1, which is connected with the resistor R1, is connected with the resistor R2 in parallel and then grounded, and the collector of the triode Q1 is connected with the operation control circuit; when the output end is connected with the battery in the positive (+) negative (-) direction, the base electrode of the triode Q1 in the reverse connection protection circuit is cut off in the reverse direction of the bias current of the emitter electrode, the collector electrode has no voltage, and therefore the MOS tube Q2 loses the bias voltage and is cut off, and the reverse current is blocked to play a protection role.
The short-circuit protection circuit comprises a triode Q3 and a resistor RS1, wherein the collector of a triode Q3 is connected with the operation control circuit, the base of the triode Q3 is connected with the emitter of a triode Q3 through a resistor RS1, the end, connected with the resistor RS1, of the emitter of the triode Q3 is connected with the operation control circuit in parallel, and the end, connected with the resistor RS1, of the collector of the triode Q3 is connected with a blocking circuit in parallel; when the output end is short-circuited, the current of the resistor RS1 increases with time, the voltage of the base of the triode Q3 rises with the increase of the current, the voltage of the base of the triode Q3 rises to the conducting voltage, the triode Q3 is conducted, the output voltage of the positive output end of the operational amplifier U1A flows to the ground through the triode Q3, the voltage of the positive output end of the operational amplifier U1A is almost zero, the operational amplifier U1A inverts, the output end of the operational amplifier U1A outputs a low level, the voltage of the resistor R4 is reduced, the MOS tube Q2 loses the bias voltage and is cut off, and the cut-off output plays a role in short-circuit and overcurrent protection.
The working principle of the utility model is as follows:
1: reverse connection protection: when the output end is connected with the battery in the positive (+) negative (-) direction, the base electrode of the triode Q1 in the reverse connection protection circuit is cut off in the reverse direction of the bias current of the emitter electrode, the collector electrode has no voltage, and therefore the MOS tube Q2 loses the bias voltage and is cut off, and the reverse current is blocked to play a protection role.
2: and (3) overcharge protection: when the circuit is normal and the battery is charged, the resistor R5 and the resistor R6 are connected in series at the positive (+) negative (-) end of the battery to form a voltage dividing point E, along with the voltage rise of the battery, when the voltage at the point E is higher than 1.25V, the operational amplifier U1A is inverted, the output end of the operational amplifier U1A outputs low level, so that the MOS transistor Q2 loses the bias voltage and is cut off, the output is cut off, and the charging is stopped.
3: preventing connection from striking fire: when the output is in a no-load state, the voltage at the point E is higher than 1.25V, the operational amplifier U1A is inverted, and the output end of the operational amplifier U1A outputs low level, so that the MOS transistor Q2 loses bias cut-off output, and even if the output end is connected with a connector or a short-circuit port, the output end cannot be ignited.
4: short-circuit protection: when the output end is short-circuited, the current of the resistor RS1 increases with time, the voltage of the base of the triode Q3 rises with the increase of the current, the voltage of the base of the triode Q3 rises to the conducting voltage, the triode Q3 is conducted, the output voltage of the positive output end of the operational amplifier U1A flows to the ground through the triode Q3, the voltage of the positive output end of the operational amplifier U1A is almost zero, the operational amplifier U1A inverts, the output end of the operational amplifier U1A outputs a low level, the voltage of the resistor R4 is reduced, the MOS tube Q2 loses the bias voltage and is cut off, and the cut-off output plays a role in short-circuit and overcurrent protection.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a multi-functional protection circuit of battery charging outfit which characterized in that: including power and battery, power one end is connected with the battery positive pole, the power other end passes through short-circuit protection circuit, blocking circuit and is connected with the battery negative pole, the parallelly connected operation control circuit in power both ends, operation control circuit and short-circuit protection circuit, blocking circuit and the protection circuit of tying against are parallelly connected, the parallelly connected protection circuit of tying against of battery positive pole and battery negative pole.
2. The multifunctional protection circuit of the charging device of claim 1, wherein: the arithmetic control circuit includes: operational amplifier U1A, resistor R8, power supply 2.5V, resistor R7, diode D2, resistor R3, diode D4, resistor R9, diode D3, resistor R5, resistor R6, resistor R10 and zener diode DZ 1;
the positive input end of the operational amplifier U1A is connected with a power supply by a resistor R8 for 2.5V, the power supply is connected with the cathode of a diode D2 after being connected with a resistor R7 in parallel by 2.5V, the anode of the diode D2 is connected with a reverse connection protection circuit, the anode of the diode D2 is connected with a resistor R3 in parallel, the other end of the resistor R3 is connected with the output end of the operational amplifier by a diode D4, one end of the resistor R3 connected with the diode D4 is connected with a blocking circuit in parallel, a resistor R9 and a diode D3 are connected between the positive input end of the operational amplifier and the output end of the operational amplifier in parallel, the negative output end of the operational amplifier U1A is connected with a resistor R5 and a resistor R6 in parallel, the other end of the resistor R5 is connected with the positive electrode of the power supply, the other end of the resistor R6 is grounded, one end of the resistor R6 is connected with a resistor R10 in parallel, the other end of the resistor R10 is connected with the operational amplifier U1A in parallel, the positive input end of the operational amplifier U1 is connected with the positive input end of the resistor R9 and the cathode of the zener diode DZ1, the anode of the voltage stabilizing diode DZ1 is connected with the end of the power supply connected with the short-circuit protection circuit and then grounded, and the end of the resistor R9 connected with the resistor R10 is connected with the short-circuit protection circuit in parallel.
3. The multifunctional protection circuit of the charging device of claim 1, wherein: the blocking circuit comprises a MOS tube Q2 and a resistor R4, the negative electrode of the battery is connected with the drain electrode of the MOS tube Q2, the source electrode of the MOS tube Q2 is connected with the grid electrode of the MOS tube Q2 through a resistor R4, the grid electrode of the MOS tube Q2 is connected with the resistor R4 at one end and is connected with a reverse connection protection circuit, and the source electrode of the MOS tube Q2 is connected with the resistor R4 at one end and is connected with a short-circuit protection circuit.
4. The multifunctional protection circuit of the charging device of claim 1, wherein: the reverse connection protection circuit comprises a diode D1, a triode Q1, a resistor R1 and a resistor R2, the positive electrode of the battery is connected with an emitting electrode of a triode Q1 through a diode D1, the base electrode of the triode Q1 is connected with the emitting electrode through a resistor R1, one end of the base electrode of the triode Q1, which is connected with a resistor R1, is connected with the resistor R2 in parallel and then grounded, and the collector electrode of the triode Q1 is connected with the operation control circuit.
5. The multifunctional protection circuit of the charging device of claim 1, wherein: the short-circuit protection circuit comprises a triode Q3 and a resistor RS1, wherein a collector electrode of the triode Q3 is connected with the operation control circuit, a base electrode of the triode Q3 is connected with an emitting electrode of the triode Q3 through a resistor RS1, the emitting electrode of the triode Q3 is connected with the resistor RS1 through the parallel operation control circuit, and a blocking circuit is connected with one end of the collector electrode of the triode Q3, which is connected with the resistor RS1, in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122229549.6U CN215733609U (en) | 2021-09-15 | 2021-09-15 | Multifunctional protection circuit of charging equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122229549.6U CN215733609U (en) | 2021-09-15 | 2021-09-15 | Multifunctional protection circuit of charging equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215733609U true CN215733609U (en) | 2022-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122229549.6U Active CN215733609U (en) | 2021-09-15 | 2021-09-15 | Multifunctional protection circuit of charging equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215733609U (en) |
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2021
- 2021-09-15 CN CN202122229549.6U patent/CN215733609U/en active Active
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