Control circuit of vehicle-mounted charger

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The charging switch module, battery feedback module and high-temperature control module in the on-board charger control circuit solve the problem of overheating of equipment charging in high-temperature environments, and achieve safe charging and automatic power-off protection of the equipment.

CN223414623UActive Publication Date: 2025-10-03GUANGZHOU YUNYANG ELECTRONIC TECH CO LTD

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Patent Information

Application Number: CN202422739012.8
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-11-11
Publication Date: 2025-10-03
Estimated Expiration: 2034-11-11

AI Technical Summary

Technical Problem

Charging mobile devices in high-temperature environments may cause the devices to overheat and be damaged, and existing technologies lack effective protection mechanisms.

Method used

A vehicle charger control circuit is designed, which includes a charging switch module, a battery feedback module, a power-off control module, and a high-temperature control module. By detecting the battery power and ambient temperature, the charging switch is automatically controlled to ensure charging when the battery is low and power is cut off when the temperature is high. This circuit has a higher priority than the power control module.

Benefits of technology

It realizes automatic power-off in high temperature environment, protects the safety of equipment, avoids equipment overheating and damage, ensures that the battery automatically cuts off the power after being fully charged at the appropriate time, and improves the safety of equipment use.

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Abstract

The utility model relates to the field of charging, and discloses a control circuit of a vehicle-mounted charger, which comprises a charging switch module used for constructing a power supply loop of a power supply and a battery; the battery feedback module is used for acquiring voltage information of the battery, acquiring sampling voltage and feeding back the sampling voltage to the power-off control module; the power-off control module is used for controlling the charging switch module to be switched on or switched off based on the reference voltage and the sampling voltage, controlling the charging switch module to be switched on when the electric quantity of the battery is insufficient, and controlling the charging switch module to be switched off when the electric quantity of the battery is fully charged; compared with the prior art, the utility model has the beneficial effects that the charging switch module is designed as a public switch, can be used as a battery charging switch and can be automatically switched off after the battery is fully charged, and can also be used as a switch-off switch in a high-temperature environment; and the priority of the high-temperature control module for controlling the charging switch module is higher than that of the power-off control module, so that the power utilization safety is ensured.

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Description

Technical Field

[0001] The utility model relates to the field of charging, in particular to a control circuit of a vehicle charger. Background Art

[0002] For drivers and passengers, in-car charging provides a convenient way to charge mobile devices such as mobile phones, tablets, and navigation systems. During long-distance driving or daily commuting, these devices may run out of power due to frequent use. In-car charging can ensure that these devices maintain sufficient power when needed.

[0003] It should be noted that charging a device in a high-temperature environment may cause the device to overheat and damage it, so charging needs to be restricted. Utility Model Content

[0004] The purpose of the present utility model is to provide a control circuit of a vehicle charger to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A control circuit for a vehicle charger, comprising:

[0007] Charging switch module, used to build a power supply circuit for the power supply and battery;

[0008] The battery feedback module is used to obtain the battery voltage information, obtain the sampled voltage, and feed it back to the power-off control module;

[0009] A power-off control module, configured to control the charging switch module to be turned on or off based on a reference voltage and a sampling voltage. When the battery power is low, the charging switch module is controlled to be turned on, and when the battery power is full, the charging switch module is controlled to be turned off.

[0010] The high temperature control module is used to detect the ambient temperature. When the ambient temperature reaches a threshold, the charging switch module is controlled to disconnect. The high temperature control module has a higher priority than the power-off control module in controlling the charging switch module.

[0011] The charging switch module is connected to the battery feedback module, the battery feedback module is connected to the power-off control module, the power-off control module is connected to the charging switch module, and the high-temperature control module is connected to the charging switch module.

[0012] As a further solution of the present invention: the charging switch module includes a switch S1, a resistor R5, a MOS tube V1, a transistor V2, and a diode D3. One end of the switch S1 is connected to the power supply voltage VCC, the other end of the switch S1 is connected to one end of the resistor R5 and the power-off control module, the other end of the resistor R5 is connected to the D pole of the MOS tube V1, the G pole of the MOS tube V1 is connected to the power-off control module and the collector of the transistor V2, the emitter of the transistor V2 is grounded, the base of the transistor V2 is connected to the high-temperature control module, the S pole of the MOS tube V1 is connected to the positive pole of the diode D3, and the negative pole of the diode D3 is connected to the battery feedback module.

[0013] As a further solution of the present invention: the battery feedback module includes a battery E1, a resistor R8, a resistor R9, a resistor R7, and a capacitor C3. The positive electrode of the battery E1 is connected to one end of the resistor R8 and the charging switch module, the negative electrode of the battery E1 is grounded, the other end of the resistor R8 is connected to one end of the resistor R9 and one end of the resistor R7, the other end of the resistor R9 is grounded, the other end of the resistor R7 is connected to one end of the capacitor C3 and the power-off control module, and the other end of the capacitor C3 is grounded.

[0014] As a further solution of the present invention: the power-off control module includes a resistor R4, a diode D2, an amplifier U3, a resistor R6, and a capacitor C4. One end of the resistor R4 is connected to the charging switch module, the other end of the resistor R4 is connected to the cathode of the diode D2 and the non-inverting end of the amplifier U3, the positive end of the diode D2 is grounded, the inverting end of the amplifier U3 is connected to the battery feedback module, the output end of the amplifier U3 is connected to one end of the resistor R6, the other end of the resistor R6 is connected to one end of the capacitor C4 and the charging switch module, and the other end of the capacitor C4 is grounded.

[0015] As a further solution of the present utility model: the high temperature control module includes a temperature sensor U1, an amplifier U2, a resistor R1, a capacitor C1, a resistor R2, a resistor R3, a capacitor C2, a potentiometer RP1, and a diode D1. The power supply end of the temperature sensor U1 is connected to the power supply voltage VCC, the output end of the temperature sensor U1 is connected to one end of the resistor R1, one end of the capacitor C1, and the non-inverting end of the amplifier U2, the other end of the resistor R1 is grounded, the other end of the capacitor C1 is grounded, the inverting end of the amplifier U2 is connected to one end of the resistor R2, one end of the resistor R3, and one end of the capacitor C2, the other end of the resistor R2 is grounded, the other end of the resistor R3 is connected to one end of the potentiometer RP1, the other end of the potentiometer RP1 is connected to the other end of the capacitor C2, the output end of the amplifier U2, and the negative pole of the diode D1, and the positive pole of the diode D1 is connected to the charging switch module.

[0016] The utility model designs a charging switch module as a common switch, which can be used as a battery charging switch, automatically disconnecting when the battery is fully charged, and can also be used as a disconnect switch in a high-temperature environment. The high-temperature control module controls the charging switch module with a higher priority than the power-off control module, ensuring power safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a schematic diagram of a control circuit of an on-board charger.

[0018] Figure 2 This is the circuit diagram of the charging switch module, power-off control module and battery feedback module.

[0019] Figure 3 This is the circuit diagram of the high temperature control module. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] See also Figure 1 The utility model provides a control circuit of a vehicle charger, comprising:

[0022] Charging switch module, used to build a power supply circuit for the power supply and battery;

[0023] The battery feedback module is used to obtain the battery voltage information, obtain the sampled voltage, and feed it back to the power-off control module;

[0024] A power-off control module, configured to control the charging switch module to be turned on or off based on a reference voltage and a sampling voltage. When the battery power is low, the charging switch module is controlled to be turned on, and when the battery power is full, the charging switch module is controlled to be turned off.

[0025] The high temperature control module is used to detect the ambient temperature. When the ambient temperature reaches a threshold, the charging switch module is controlled to disconnect. The high temperature control module has a higher priority than the power-off control module in controlling the charging switch module.

[0026] The charging switch module is connected to the battery feedback module, the battery feedback module is connected to the power-off control module, the power-off control module is connected to the charging switch module, and the high-temperature control module is connected to the charging switch module.

[0027] In this example: See Figure 2The charging switch module includes a switch S1, a resistor R5, a MOS tube V1, a transistor V2, and a diode D3. One end of the switch S1 is connected to the power supply voltage VCC, the other end of the switch S1 is connected to one end of the resistor R5 and the power-off control module, the other end of the resistor R5 is connected to the D electrode of the MOS tube V1, the G electrode of the MOS tube V1 is connected to the power-off control module and the collector of the transistor V2, the emitter of the transistor V2 is grounded, the base of the transistor V2 is connected to the high-temperature control module, the S electrode of the MOS tube V1 is connected to the anode of the diode D3, and the cathode of the diode D3 is connected to the battery feedback module.

[0028] After the switch S1 is closed, when the high temperature control module does not output a voltage signal and the power off control module outputs a voltage signal, the G pole of the MOS tube V1 is at a high level, the MOS tube V1, the circuit is turned on, and power is supplied to the battery E1.

[0029] In this example: See Figure 2 The battery feedback module includes a battery E1, a resistor R8, a resistor R9, a resistor R7, and a capacitor C3. The positive electrode of the battery E1 is connected to one end of the resistor R8 and the charging switch module, the negative electrode of the battery E1 is grounded, the other end of the resistor R8 is connected to one end of the resistor R9 and one end of the resistor R7, the other end of the resistor R9 is grounded, the other end of the resistor R7 is connected to one end of the capacitor C3 and the power-off control module, and the other end of the capacitor C3 is grounded.

[0030] After the voltage is input, the battery E1 is charged, and the sum of the voltages across the resistors R8 and R9 is the voltage across the battery E1. The voltage across the resistor R9 is used as a sampling voltage and is output to the power-off control module after passing through the resistor R7 and the capacitor C3.

[0031] In this example: See Figure 2 The power-off control module includes a resistor R4, a diode D2, an amplifier U3, a resistor R6, and a capacitor C4. One end of the resistor R4 is connected to the charging switch module, the other end of the resistor R4 is connected to the cathode of the diode D2 and the non-inverting end of the amplifier U3, the anode of the diode D2 is grounded, the inverting end of the amplifier U3 is connected to the battery feedback module, the output end of the amplifier U3 is connected to one end of the resistor R6, the other end of the resistor R6 is connected to one end of the capacitor C4 and the charging switch module, and the other end of the capacitor C4 is grounded.

[0032] Diode D2 is a voltage regulator diode, which enables the non-inverting terminal of amplifier U3 to obtain a stable voltage as a reference voltage. The inverting terminal of amplifier U3 feeds back the current voltage of battery E1. When battery E1 is not fully charged, the voltage at the non-inverting terminal of amplifier U3 is higher than the voltage at the inverting terminal, and the output is a high level, triggering MOS tube V1 to turn on, and the circuit charges battery E1. After battery E1 is fully charged, the voltage at the non-inverting terminal of amplifier U3 is lower than the voltage at the inverting terminal, and the output is a low level, MOS tube V1 is cut off, and battery E1 stops charging.

[0033] In this example: See Figure 3 The high temperature control module includes a temperature sensor U1, an amplifier U2, a resistor R1, a capacitor C1, a resistor R2, a resistor R3, a capacitor C2, a potentiometer RP1, and a diode D1. The power supply end of the temperature sensor U1 is connected to the power supply voltage VCC, the output end of the temperature sensor U1 is connected to one end of the resistor R1, one end of the capacitor C1, and the non-inverting end of the amplifier U2, the other end of the resistor R1 is grounded, the other end of the capacitor C1 is grounded, the inverting end of the amplifier U2 is connected to one end of the resistor R2, one end of the resistor R3, and one end of the capacitor C2, the other end of the resistor R2 is grounded, the other end of the resistor R3 is connected to one end of the potentiometer RP1, the other end of the potentiometer RP1 is connected to the other end of the capacitor C2, the output end of the amplifier U2, and the cathode of the diode D1, and the anode of the diode D1 is connected to the charging switch module.

[0034] When the ambient temperature is normal, the voltage output by the temperature sensor U1 is not enough to turn on the voltage-stabilizing diode D1 after being amplified by the amplifier U2. When the ambient temperature is higher than the set threshold, the diode D1 is turned on, causing the transistor V2 to be turned on, so that the G pole of the MOS tube V1 is grounded through the transistor V1, and the MOS tube V1 is cut off. When the amplifier U3 outputs a high level, the G pole of the MOS tube V1 is still in a low level state due to the conduction and grounding of the transistor V1.

[0035] The working principle of the present utility model is as follows: the charging switch module is used to construct a power supply circuit between the power supply and the battery; the battery feedback module is used to obtain the voltage information of the battery, obtain the sampled voltage, and feed it back to the power-off control module; the power-off control module is used to control the charging switch module to be turned on or off based on the reference voltage and the sampled voltage. When the battery power is insufficient, the charging switch module is controlled to be turned on, and when the battery power is fully charged, the charging switch module is controlled to be disconnected; the high-temperature control module is used to detect the ambient temperature, and when the ambient temperature reaches a threshold, the charging switch module is controlled to be disconnected. The high-temperature control module has a higher priority in controlling the charging switch module than the power-off control module.

[0036] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive.

[0037] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A control circuit for a vehicle charger, characterized in that: include: Charging switch module, used to build a power supply circuit for the power supply and battery; The battery feedback module is used to obtain the battery voltage information, obtain the sampled voltage, and feed it back to the power-off control module; A power-off control module, configured to control the charging switch module to be turned on or off based on a reference voltage and a sampling voltage. When the battery power is low, the charging switch module is controlled to be turned on, and when the battery power is full, the charging switch module is controlled to be turned off. The high temperature control module is used to detect the ambient temperature. When the ambient temperature reaches a threshold, the charging switch module is controlled to disconnect. The high temperature control module has a higher priority than the power-off control module in controlling the charging switch module. The charging switch module is connected to the battery feedback module, the battery feedback module is connected to the power-off control module, the power-off control module is connected to the charging switch module, and the high-temperature control module is connected to the charging switch module.

2. The control circuit of the vehicle charger according to claim 1, characterized in that: The charging switch module includes a switch S1, a resistor R5, a MOS transistor V1, a transistor V2, and a diode D3. One end of the switch S1 is connected to the power supply voltage VCC, the other end of the switch S1 is connected to one end of the resistor R5 and the power-off control module, the other end of the resistor R5 is connected to the D electrode of the MOS transistor V1, the G electrode of the MOS transistor V1 is connected to the power-off control module and the collector of the transistor V2, the emitter of the transistor V2 is grounded, the base of the transistor V2 is connected to the high-temperature control module, the S electrode of the MOS transistor V1 is connected to the anode of the diode D3, and the cathode of the diode D3 is connected to the battery feedback module.

3. The control circuit of the vehicle charger according to claim 1, characterized in that: The battery feedback module includes a battery E1, a resistor R8, a resistor R9, a resistor R7, and a capacitor C3. The positive electrode of the battery E1 is connected to one end of the resistor R8 and the charging switch module, the negative electrode of the battery E1 is grounded, the other end of the resistor R8 is connected to one end of the resistor R9 and one end of the resistor R7, the other end of the resistor R9 is grounded, the other end of the resistor R7 is connected to one end of the capacitor C3 and the power-off control module, and the other end of the capacitor C3 is grounded.

4. The control circuit of the vehicle charger according to claim 2, characterized in that: The power-off control module includes a resistor R4, a diode D2, an amplifier U3, a resistor R6, and a capacitor C4. One end of the resistor R4 is connected to the charging switch module, the other end of the resistor R4 is connected to the cathode of the diode D2 and the non-inverting end of the amplifier U3, the anode of the diode D2 is grounded, the inverting end of the amplifier U3 is connected to the battery feedback module, the output end of the amplifier U3 is connected to one end of the resistor R6, the other end of the resistor R6 is connected to one end of the capacitor C4 and the charging switch module, and the other end of the capacitor C4 is grounded.

5. The control circuit of the vehicle charger according to claim 2, characterized in that: The high-temperature control module includes a temperature sensor U1, an amplifier U2, a resistor R1, a capacitor C1, a resistor R2, a resistor R3, a capacitor C2, a potentiometer RP1, and a diode D1. The power supply end of the temperature sensor U1 is connected to the power supply voltage VCC, the output end of the temperature sensor U1 is connected to one end of the resistor R1, one end of the capacitor C1, and the non-inverting end of the amplifier U2, the other end of the resistor R1 is grounded, the other end of the capacitor C1 is grounded, the inverting end of the amplifier U2 is connected to one end of the resistor R2, one end of the resistor R3, and one end of the capacitor C2, the other end of the resistor R2 is grounded, the other end of the resistor R3 is connected to one end of the potentiometer RP1, the other end of the potentiometer RP1 is connected to the other end of the capacitor C2, the output end of the amplifier U2, and the negative electrode of the diode D1, and the positive electrode of the diode D1 is connected to the charging switch module.