CN215498326U - Charger identification protection circuit - Google Patents
Charger identification protection circuit Download PDFInfo
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- CN215498326U CN215498326U CN202121249794.7U CN202121249794U CN215498326U CN 215498326 U CN215498326 U CN 215498326U CN 202121249794 U CN202121249794 U CN 202121249794U CN 215498326 U CN215498326 U CN 215498326U
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Abstract
The utility model provides a charger identification protection circuit, which is characterized in that: the charging control module is arranged between a charging port and a battery pack interface, is used for detecting charging voltage or/and current, and is controlled by the MCU main control module to realize on/off control of output of the battery pack interface. The MCU master control module comprises an MCU master control chip, and the MCU master control chip is provided with a charging current detection pin, a charger detection pin and a charging control pin which are connected with the charging control module; the charging control module comprises a current detection circuit in butt joint with the charging current detection pin, a voltage detection circuit in butt joint with the charger detection pin and a charging control circuit in butt joint with the charging control pin.
Description
Technical Field
The utility model belongs to the technical field of charging, and particularly relates to a charger identification protection circuit.
Background
The rechargeable battery pack has strict parameter requirements on the charger, and the safety can be ensured only by using the charger meeting the requirements to charge the battery pack, so that accidents are avoided. At present, electronic products are generally equipped with chargers when being shipped, if the chargers are damaged or lost, some users may use chargers of other devices to charge, but because battery packs selected by different products have differences, electrical specifications of the battery packs are different, if voltage or current of the chargers exceeds charging limit values of the products, the battery packs and battery control boards are damaged, and even the battery packs are seriously ignited and exploded. Therefore, in addition to enhancing the safety awareness of the user, the charging identification and protection mechanism on the electronic product should be improved.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems in the prior art, the utility model provides a charger identification protection circuit, which is realized by the following technical means: the charger identification protection circuit comprises an MCU main control module and a charging control module connected with the MCU main control module, wherein the charging control module is arranged between a charging port and a battery pack interface, is used for detecting charging voltage or/and current and is controlled by the MCU main control module to realize on/off control of output of the battery pack interface.
In one or more embodiments of the present invention, the MCU main control module includes an MCU main control chip, and the MCU main control chip is provided with a charging current detection pin, a charger detection pin, and a charging control pin, which are connected to the charging control module; the charging control module comprises a current detection circuit in butt joint with a charging current detection pin, a voltage detection circuit in butt joint with a charger detection pin and a charging control circuit in butt joint with the charging control pin, the current detection circuit is arranged between a negative electrode C-of the charging port and a ground end, the voltage detection circuit is arranged between a positive electrode C + of the charging port and the ground end, and the charging control circuit is arranged between the charging port and a battery pack interface.
In one or more embodiments of the present invention, the voltage detection circuit includes resistors R3 and R14 connected in series between the positive electrode C + of the charging port and the ground, the connection point of the resistors R3 and R14 is connected to the charger detection pin, and a capacitor C3 is connected in parallel to the two ends of the resistor R14.
In one or more embodiments of the present invention, the current detection circuit includes resistors R5, R8, and R23 connected in sequence, a connection point of the resistors R8 and R23 is connected to the negative electrode C of the charging port, and a connection point of the resistors R5 and R8 is connected to the charging current detection pin and is grounded via a capacitor C5; the resistor R5 is connected to a reference positive voltage.
In one or more embodiments of the present invention, the charging control circuit includes switching tubes Q1 and Q2 and a diode D1, the switching tube Q1 is connected between the positive electrode C + of the charging port and the diode D1, the cathode of the diode D1 is connected to the battery pack interface, the switching tube Q2 is connected between the control electrode of the switching tube Q1 and the ground, and the control electrode thereof is connected to the charging control pin.
In one or more embodiments of the present invention, a fuse F1 is connected between the cathode of the diode D1 and the battery pack interface.
In one or more embodiments of the present invention, the charging control pin outputs a PWM pulse signal.
In one or more embodiments of the present invention, the utility model further includes a power management module, where the power management module includes a voltage regulator chip U2, a transistor Q9 and a transistor Q10, a fast-conducting diode D4, and a voltage regulator tube D5; the collector of the triode Q10 is connected to the positive electrode B + of the battery pack interface through resistors R33 and R36, and the emitter of the triode Q10 is grounded; the resistors R38 and R39 are connected in series between the MCU main control chip and the ground, and the connection point of the resistors R38 and R39 is connected with the base electrode of the triode Q10; the connecting point of the resistors R33 and R36 is connected with the base electrode of the triode Q9, and the emitting electrode of the triode Q9 is connected with the positive electrode B + of the battery pack interface; the fast-conducting diode D4 has two anodes and a common cathode, wherein one anode is connected with the collector of the triode Q9, and the other anode is connected with the charging electrode C +, and the common cathode is connected with the input end of the voltage-stabilizing chip U2 through the voltage-stabilizing tube D5; the MCU master control module further comprises a capacitor C16, a resistor R35 and a resistor R37 which are connected in series between a +5V power supply end and a ground end, and the connection point of the resistor R35 and the resistor R37 is used as a connection resistor R38 to output a power supply ON or power supply OFF signal.
In one or more embodiments of the present invention, the LED display module further includes a light source LED1 and a light source LED2 with different colors, and the light source LED1 and the light source LED2 are used to indicate the circuit operation status.
In one or more embodiments of the present invention, the MCU master control module further includes a capacitor C16, a resistor R35 and a resistor R37 connected in series between the +5V power terminal and the ground terminal, wherein a connection point of the resistors R35 and R37 outputs a power ON or power OFF signal.
Compared with the prior art, the utility model detects the electrical parameters of the charger connected with the product in real time, realizes the timely stop of the charging action of the charger which does not meet the requirement, and ensures the use safety of the battery pack.
Drawings
Fig. 1 is a schematic block diagram of the present invention.
Fig. 2 is a schematic circuit diagram of the power management module of the present invention.
Fig. 3 is a schematic circuit diagram of the MCU master control module of the present invention.
Fig. 4 is a schematic circuit diagram of the charge control module of the present invention.
Fig. 5 is a schematic circuit diagram of the LED display module of the present invention.
Detailed Description
The scheme of the present application is further described below with reference to the accompanying drawings 1 to 5:
referring to fig. 1, the charger identification protection circuit includes an MCU main control module, a charging control module, a power management module, and an LED display module, wherein the charging control module is disposed between a charging port and a battery pack interface, and is configured to detect charging voltage or/and current, and is controlled by the MCU main control module to implement on/off control of output of the battery pack interface.
Referring to fig. 2 to 5, the MCU main control module includes an MCU main control chip (for example, a siyuan 92 series single chip microcomputer is adopted, and a 12-bit AD and a 10-bit PWM function module are integrated therein), and the MCU main control chip is provided with a charging current detection pin, a charger detection pin, and a charging control pin connected to the charging control module; the MCU master control module further comprises a capacitor C16, a resistor R35 and a resistor R37 which are connected in series between the +5V power supply end and the ground end, and the connection point of the resistor R35 and the resistor R37 outputs a power supply ON or power supply OFF signal.
The charging control module comprises a current detection circuit in butt joint with a charging current detection pin, a voltage detection circuit in butt joint with a charger detection pin and a charging control circuit in butt joint with the charging control pin, the current detection circuit is arranged between a negative electrode C-of the charging port and a ground end, the voltage detection circuit is arranged between a positive electrode C + of the charging port and the ground end, and the charging control circuit is arranged between the charging port and a battery pack interface.
The voltage detection circuit comprises resistors R3 and R14 which are connected in series between the positive electrode C + of the charging port and the ground, the connection point of the resistors R3 and R14 is connected to the detection pin of the charger, and two ends of the resistor R14 are connected with a capacitor C3 in parallel. When the charger is plugged, the voltage of the charging port is divided by the resistors R3 and R14, and then filtered by the capacitor C3 to obtain a stable electric signal which is sent to the charger detection pin of the MCU main control chip, and then compared with the reference voltage set inside the MCU main control chip to calculate whether the control signal is to close or open the charging control. In the circuit, a high-precision resistor is required to be adopted for a voltage dividing resistor used for voltage division, a 1% precision resistor is selected, the identification voltage range is wide, and the voltage after voltage division cannot be larger than the working voltage of the MCU main control chip.
The current detection circuit comprises resistors R5, R8 and R23 which are connected in sequence, the connection point of the resistor R8 and the resistor R23 is connected to the negative pole C-of the charging port, and the connection point of the resistor R5 and the resistor R8 is connected to the charging current detection pin and is grounded through a capacitor C5; the resistor R5 is connected to the charge control pin. When the charging port is opened for charging, the charging loop passes through the R23 resistor, when current flows through the loop, negative pressure difference (for the ground wire of the MCU main control chip) can be generated on the R23 resistor, because the MCU main control chip can not detect negative pressure, a reference positive voltage is divided by the resistors R5 and R8, the sum of the two voltages is filtered by the capacitor C5 and then is sent to the charging current detection pin of the MCU main control chip, and the MCU main control chip internally compares and calculates a control signal and sends the control signal to the charging control circuit. In this circuit, the resistance R23 is required to have a resistance value as small as possible, thereby reducing the resistance-to-current loss.
The charging control circuit comprises switching tubes Q1 and Q2 and a diode D1, wherein the switching tube Q1 is connected between the positive electrode C + of the charging port and the diode D1, the cathode of the diode D1 is connected with a battery pack interface, the switching tube Q2 is connected between the control electrode of the switching tube Q1 and the ground end, and the control electrode of the switching tube Q2 is connected to a charging control pin. And a fuse F1 is connected between the cathode of the diode D1 and the interface of the battery pack. And the charging control pin outputs a PWM pulse signal. The circuit controls the circuit switch and the on-off time according to a charging control signal (PWM pulse signal) sent by the MCU main control chip. When a high level is input, the switching tube Q2 is turned on, the potential of the base drain is pulled low, and the switching tube Q1 starts to be turned on to form a loop through the resistor R6 to the gate of the switching tube Q1, so that charging is started. Otherwise, the charging is closed. The on and off time of the switching tube Q1 is adjusted by the duty ratio of the charging control signal (PWM pulse signal), so as to adjust the magnitude and power of the charging current.
The power management module comprises a voltage stabilizing chip U2, triodes Q9 and Q10, a fast-conducting diode D4 and a voltage stabilizing tube D5; the collector of the triode Q10 is connected to the positive electrode B + of the battery pack interface through resistors R33 and R36, and the emitter of the triode Q10 is grounded; the resistors R38 and R39 are connected in series between the MCU main control chip and the ground, and the connection point of the resistors R38 and R39 is connected with the base electrode of the triode Q10; the connecting point of the resistors R33 and R36 is connected with the base electrode of the triode Q9, and the emitting electrode of the triode Q9 is connected with the positive electrode B + of the battery pack interface; the fast-conducting diode D4 has two anodes and a common cathode, wherein one anode is connected with the collector of the triode Q9, and the other anode is connected with the charging electrode C +, and the common cathode is connected with the input end of the voltage-stabilizing chip U2 through the voltage-stabilizing tube D5; the MCU master control module further comprises a capacitor C16, a resistor R35 and a resistor R37 which are connected in series between a +5V power supply end and a ground end, and the connection point of the resistor R35 and the resistor R37 is used as a connection resistor R38 to output a power supply ON or power supply OFF signal. In this module, by steady voltage chip U2, resistance R38, R39, R36, R33, R34, triode Q9 and Q10, the power supply locking circuit that leads diode D4 etc. soon, there is the voltage of charger to supply power for the circuit at the anodal C + of charging mouth when just beginning to insert the charger, then MCU main control chip begins work, the ON _ LOCK foot output high potential of main control chip simultaneously, triode Q10, Q9 switches ON in proper order, realized by charger and two way power supplies of battery package, provide clean stable operating voltage for MCU main control chip after the steady voltage of steady voltage chip U2 steady voltage.
The LED display module comprises light source LEDs 1 and LEDs 2 of different colors, the light source LEDs 1 and the light source LEDs 2 are used for indicating the working state of a circuit, the LED display module specifically comprises a first branch formed by connecting a resistor R50 and a light source LED1 in series and a second branch formed by connecting a resistor R51 and a light source LED2 in series, the light source LED1 is blue light, the light source LED2 is red light, the red light is driven by an MCU (microprogrammed control Unit) main control chip respectively, and the LED display module is normally charged and provided with a bright red light, is fully charged and provided with a bright blue light and is provided with a fault red light.
The above preferred embodiments should be considered as examples of the embodiments of the present application, and technical deductions, substitutions, improvements and the like similar to, similar to or based on the embodiments of the present application should be considered as the protection scope of the present patent.
Claims (10)
1. A charger identification protection circuit is characterized in that: the charging control module is arranged between a charging port and a battery pack interface, is used for detecting charging voltage or/and current, and is controlled by the MCU main control module to realize on/off control of output of the battery pack interface.
2. The charger identification protection circuit of claim 1, wherein: the MCU master control module comprises an MCU master control chip, and the MCU master control chip is provided with a charging current detection pin, a charger detection pin and a charging control pin which are connected with the charging control module; the charging control module comprises a current detection circuit in butt joint with a charging current detection pin, a voltage detection circuit in butt joint with a charger detection pin and a charging control circuit in butt joint with the charging control pin, the current detection circuit is arranged between a negative electrode C-of the charging port and a ground end, the voltage detection circuit is arranged between a positive electrode C + of the charging port and the ground end, and the charging control circuit is arranged between the charging port and a battery pack interface.
3. The charger identification protection circuit of claim 2, wherein: the voltage detection circuit comprises resistors R3 and R14 which are connected in series between the positive electrode C + of the charging port and the ground, the connection point of the resistors R3 and R14 is connected to the detection pin of the charger, and two ends of the resistor R14 are connected with a capacitor C3 in parallel.
4. The charger identification protection circuit of claim 2, wherein: the current detection circuit comprises resistors R5, R8 and R23 which are connected in sequence, the connection point of the resistor R8 and the resistor R23 is connected to the negative pole C-of the charging port, and the connection point of the resistor R5 and the resistor R8 is connected to the charging current detection pin and is grounded through a capacitor C5; the resistor R5 is connected to a reference positive voltage.
5. The charger identification protection circuit of claim 2, wherein: the charging control circuit comprises switching tubes Q1 and Q2 and a diode D1, wherein the switching tube Q1 is connected between the positive electrode C + of the charging port and the diode D1, the cathode of the diode D1 is connected with a battery pack interface, the switching tube Q2 is connected between the control electrode of the switching tube Q1 and the ground end, and the control electrode of the switching tube Q2 is connected to a charging control pin.
6. The charger identification protection circuit of claim 5, wherein: and a fuse F1 is connected between the cathode of the diode D1 and the interface of the battery pack.
7. The charger identification protection circuit of claim 5, wherein: and the charging control pin outputs a PWM pulse signal.
8. The charger identification protection circuit of any one of claims 1 to 7, wherein: the power supply management module comprises a voltage stabilizing chip U2, triodes Q9 and Q10, a fast-conducting diode D4 and a voltage stabilizing tube D5; the collector of the triode Q10 is connected to the positive electrode B + of the battery pack interface through resistors R33 and R36, and the emitter of the triode Q10 is grounded; the resistors R38 and R39 are connected in series between the ON-LOCK pin of the MCU main control chip and the ground, and the connection point of the resistors R38 and R39 is connected with the base electrode of the triode Q10; the connecting point of the resistors R33 and R36 is connected with the base electrode of the triode Q9, and the emitting electrode of the triode Q9 is connected with the positive electrode B + of the battery pack interface; the fast-conducting diode D4 has two anodes and a common cathode, wherein one anode is connected with the collector of the transistor Q9, and the other anode is connected with the charging electrode C +, and the common cathode is connected with the input end of the voltage-stabilizing chip U2 through the voltage-stabilizing tube D5.
9. The charger identification protection circuit of any one of claims 1 to 7, wherein: and the LED display module comprises a light source LED1 and an LED2 with different colors, wherein the light source LED1 and the LED2 are used for indicating the working state of the circuit.
10. The charger identification protection circuit of any one of claims 1 to 7, wherein: the MCU master control module further comprises a capacitor C16, a resistor R35 and a resistor R37 which are connected in series between the +5V power supply end and the ground end, and the connection point of the resistor R35 and the resistor R37 outputs a power supply ON or power supply OFF signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121249794.7U CN215498326U (en) | 2021-06-05 | 2021-06-05 | Charger identification protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121249794.7U CN215498326U (en) | 2021-06-05 | 2021-06-05 | Charger identification protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215498326U true CN215498326U (en) | 2022-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121249794.7U Active CN215498326U (en) | 2021-06-05 | 2021-06-05 | Charger identification protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215498326U (en) |
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2021
- 2021-06-05 CN CN202121249794.7U patent/CN215498326U/en active Active
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Denomination of utility model: Charger identification protection circuit Effective date of registration: 20220927 Granted publication date: 20220111 Pledgee: Science and Technology Branch of Torch Development Zone of Zhongshan Rural Commercial Bank Co.,Ltd. Pledgor: Zhongshan Chunqiao Electronic Technology Co.,Ltd. Registration number: Y2022980016503 |