CN219544540U - Temperature protection circuit for electric vehicle charger - Google Patents

Temperature protection circuit for electric vehicle charger Download PDF

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Publication number
CN219544540U
CN219544540U CN202320504577.0U CN202320504577U CN219544540U CN 219544540 U CN219544540 U CN 219544540U CN 202320504577 U CN202320504577 U CN 202320504577U CN 219544540 U CN219544540 U CN 219544540U
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resistor
circuit
capacitor
amplifier
protection circuit
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CN202320504577.0U
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Chinese (zh)
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陈雷
何昌良
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Wuxi Dapai Electronic Co ltd
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Wuxi Dapai Electronic Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The utility model discloses a temperature protection circuit, which belongs to the technical field of electric vehicle chargers, and particularly relates to a temperature protection circuit for an electric vehicle charger, comprising: the primary side flyback transformer comprises a primary side flyback transformer circuit, a transformer, a rectifying circuit, an amplifying circuit, an electronic switch, an isolating circuit, a temperature grading regulating circuit and a protecting circuit; the utility model carries out over-temperature protection on the battery, carries out graded adjustment on charging current according to the temperature of the central battery, has reliable electrical isolation when charging between battery packs, simultaneously adapts to a wider charging power supply voltage range, and adopts isolation flyback conversion topology.

Description

Temperature protection circuit for electric vehicle charger
Technical Field
The utility model discloses a temperature protection circuit, belongs to the technical field of electric vehicle chargers, and particularly relates to a temperature protection circuit for an electric vehicle charger.
Background
The charger is an accessory of the electric bicycle and is a device for supplementing electric energy to the storage battery. The electric bicycle can meet the electricity consumption requirement of the electric bicycle, protect the storage battery and effectively prolong the service life of the storage battery.
The charger of the electric bicycle generally adopts a switch power supply charger and is divided into two stages of charging modes and three stages of charging modes.
The charging process is divided into constant-current and constant-voltage charging stages, and the charging current gradually decreases along with the voltage rise of the storage battery. When the electric quantity of the storage battery rises to a certain degree, the storage battery is changed into constant voltage charge, so that the voltage in the storage battery slowly rises, and when the voltage of the storage battery reaches the charging termination voltage of a charger (different charging modes, different voltages, the termination voltage of a multi-stage charging mode is generally 41.4V, the constant voltage charging mode is generally 43.8-44.4V), the storage battery is changed into trickle charge, namely floating charge, so that the storage battery can be effectively protected, and the service life of the storage battery is prolonged. Three-stage charging is commonly adopted for electric vehicles.
The electric bicycle charger is independent from the electric bicycle. The charger is a device for supplementing the storage battery with electric energy. The quality of the charger has direct influence on the service life of the storage battery and the normal running of the electric bicycle. The storage battery used for the electric bicycle has various types, and various types of charging modes are different, but the working principle is different.
But in the prior art, because the increase of electric motor car battery capacity and the promotion of battery efficiency, this is very big to the charging efficiency requirement of charger, when promoting charging efficiency, the inside temperature of charger is also increasing this moment, and traditional then adopts the fan to dispel the heat, and this kind of heat dissipation only can reduce fractional temperature, can not solve the too high problem of temperature completely.
Disclosure of Invention
The utility model aims to: a temperature protection circuit for an electric vehicle charger is provided that solves the above-mentioned problems.
The technical scheme is as follows: a temperature protection circuit for an electric vehicle charger, the temperature protection circuit being connected between a power source and a battery pack;
the temperature protection circuit includes: the primary side flyback transformer circuit is connected with the power supply, the transformer and the input end are connected with the primary side flyback transformer circuit, the rectifying circuit, the input end is connected with the output end of the transformer, the amplifying circuit and the output end of the rectifying circuit, the electronic switch and the output end of the amplifying circuit are connected, the output end of the amplifying circuit is connected with the battery pack, the isolating circuit is connected with the primary side flyback transformer circuit and the rectifying circuit, the temperature grading regulating circuit is connected with the output end of the isolating circuit, the protecting circuit is connected with the electronic switch, the temperature sensor is connected between the protecting circuit and the temperature grading regulating circuit.
In a further embodiment, the protection circuit includes: the resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8, the resistor R9, the resistor R10, the resistor R11, the resistor R12, the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4, the amplifier U3A, the amplifier U3B, the thermistor RT1 and the triode Q1;
one end of the controllable silicon U1 is connected with one end of the resistor R1, the other end of the controllable silicon U1 is connected with one end of the resistor R2, the control end of the controllable silicon U1 is simultaneously connected with the other end of the resistor R1 and the other end of the resistor R2, one end of the capacitor C1 is simultaneously connected with one end of the resistor R1 and one end of the resistor R3, the other end of the capacitor C1 is simultaneously connected with one end of the resistor R2 and one end of the resistor R4, one end of the resistor R5 is simultaneously connected with one end of the controllable silicon U2, the control end and one end of the thermistor RT1, the other end of the thermistor RT1 is simultaneously connected with one end of the resistor R6 and one end of the capacitor C2 and the in-phase input end of the amplifier U3A, the positive voltage end of the amplifier U3A is simultaneously connected with the other end of the resistor R5 and one end of the resistor R3A, the inverting input end of the amplifier U3A is simultaneously connected with one end of the resistor R7 and one end of the resistor R8 and one end of the capacitor C3, the negative voltage end of the amplifier U3A is simultaneously connected with the other end of the resistor R7, the other end of the capacitor C2, the other end of the resistor R6, the other end of the resistor R4 and the other end of the silicon controlled rectifier U2, the output end of the amplifier U3A is simultaneously connected with the other end of the resistor R8, the other end of the capacitor C3 and one end of the resistor R10, the non-inverting input end of the amplifier U3B is simultaneously connected with the other end of the resistor R3 and the other end of the resistor R4, the inverting input end of the amplifier U3B is simultaneously connected with the other end of the resistor R10, one end of the resistor R9 and one end of the capacitor C4, the output end of the amplifier U3B is simultaneously connected with the other end of the resistor R9, the other end of the capacitor C4 and one end of the resistor R11, the base of the triode Q1 is simultaneously connected with the other end of the resistor R11 and one end of the resistor R12, the incident electrode of the triode Q1 outputs positive voltage, and the emitting electrode of the triode Q1 is simultaneously connected with the other end of the resistor R12 and the negative voltage end of the amplifier U3A and outputs negative voltage.
In a further embodiment, a filter capacitor is arranged between the temperature protection circuit and the power supply, and the filter capacitor is connected between the power supply and the primary side flyback variation circuit.
In a further embodiment, the isolation circuit is constituted by a photo-isolator.
In a further embodiment, the electronic switch is composed of two P-channel enhancement field effect transistors Q2 and Q3 with ultra-low on-resistance.
In a further embodiment, the field effect transistor Q2 is connected to an input terminal of a protection circuit, and the field effect transistor Q3 is connected to an output terminal of the protection circuit.
The beneficial effects are that: the utility model discloses a temperature protection circuit, which belongs to the technical field of electric vehicle chargers, and particularly relates to a temperature protection circuit for an electric vehicle charger, comprising: the utility model relates to a battery charging device, which comprises a primary flyback transformer circuit, a rectifier circuit, an electronic switch, an isolating circuit, a temperature grading regulating circuit, a protection circuit, a temperature sensor, a protection circuit and a temperature grading regulating circuit, wherein the primary flyback transformer circuit is connected with a power supply, the transformer and the input end are connected with the primary flyback transformer circuit, the rectifier circuit is connected with the input end of the transformer, the input end of the amplifying circuit is connected with the output end of the rectifier circuit, the electronic switch is connected with the output end of the primary flyback transformer circuit, the input end of the amplifying circuit is connected with the battery pack, the isolating circuit is connected with the primary flyback transformer circuit and the rectifier circuit, the temperature grading regulating circuit is connected with the protection circuit, the battery is subjected to overtemperature protection according to the temperature grading regulation of a central battery, and the battery pack is provided with reliable electrical isolation during charging and is suitable for a wider charging power supply voltage range.
Drawings
Fig. 1 is a schematic diagram of the present utility model.
Fig. 2 is a schematic diagram of the protection circuit of the present utility model.
Fig. 3 is a schematic diagram of an electronic switch of the present utility model.
Description of the embodiments
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, a temperature protection circuit for an electric vehicle charger is connected between a power supply and a battery pack;
the temperature protection circuit includes: the primary side flyback transformer circuit is connected with the power supply, the transformer and the input end are connected with the primary side flyback transformer circuit, the rectifying circuit, the input end is connected with the output end of the transformer, the amplifying circuit and the output end of the rectifying circuit, the electronic switch and the output end of the amplifying circuit are connected, the output end of the amplifying circuit is connected with the battery pack, the isolating circuit is connected with the primary side flyback transformer circuit and the rectifying circuit, the temperature grading regulating circuit is connected with the output end of the isolating circuit, the protecting circuit is connected with the electronic switch, the temperature sensor is connected between the protecting circuit and the temperature grading regulating circuit.
In one embodiment, as shown in fig. 2, the protection circuit includes: the resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8, the resistor R9, the resistor R10, the resistor R11, the resistor R12, the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4, the amplifier U3A, the amplifier U3B, the thermistor RT1 and the triode Q1;
one end of the controllable silicon U1 is connected with one end of the resistor R1, the other end of the controllable silicon U1 is connected with one end of the resistor R2, the control end of the controllable silicon U1 is simultaneously connected with the other end of the resistor R1 and the other end of the resistor R2, one end of the capacitor C1 is simultaneously connected with one end of the resistor R1 and one end of the resistor R3, the other end of the capacitor C1 is simultaneously connected with one end of the resistor R2 and one end of the resistor R4, one end of the resistor R5 is simultaneously connected with one end of the controllable silicon U2, the control end and one end of the thermistor RT1, the other end of the thermistor RT1 is simultaneously connected with one end of the resistor R6 and one end of the capacitor C2 and the in-phase input end of the amplifier U3A, the positive voltage end of the amplifier U3A is simultaneously connected with the other end of the resistor R5 and one end of the resistor R3A, the inverting input end of the amplifier U3A is simultaneously connected with one end of the resistor R7 and one end of the resistor R8 and one end of the capacitor C3, the negative voltage end of the amplifier U3A is simultaneously connected with the other end of the resistor R7, the other end of the capacitor C2, the other end of the resistor R6, the other end of the resistor R4 and the other end of the silicon controlled rectifier U2, the output end of the amplifier U3A is simultaneously connected with the other end of the resistor R8, the other end of the capacitor C3 and one end of the resistor R10, the non-inverting input end of the amplifier U3B is simultaneously connected with the other end of the resistor R3 and the other end of the resistor R4, the inverting input end of the amplifier U3B is simultaneously connected with the other end of the resistor R10, one end of the resistor R9 and one end of the capacitor C4, the output end of the amplifier U3B is simultaneously connected with the other end of the resistor R9, the other end of the capacitor C4 and one end of the resistor R11, the base of the triode Q1 is simultaneously connected with the other end of the resistor R11 and one end of the resistor R12, the incident electrode of the triode Q1 outputs positive voltage, and the emitting electrode of the triode Q1 is simultaneously connected with the other end of the resistor R12 and the negative voltage end of the amplifier U3A and outputs negative voltage.
In one embodiment, as shown in fig. 1, a filter capacitor is disposed between the temperature protection circuit and the power supply, and the filter capacitor is connected between the power supply and the primary flyback converter circuit.
In one embodiment, the isolation circuit is comprised of a photo-isolator.
In one embodiment, as shown in fig. 3, the electronic switch is composed of two P-channel enhancement field effect transistors Q2 and Q3 with ultra-low on-resistance, and in order to minimize the power consumption of the battery output main circuit, the P-channel enhancement field effect transistors with ultra-low on-resistance are selected for Q1 and Q2.
In one embodiment, the fet Q2 is connected to an input terminal of a protection circuit, and the fet Q3 is connected to an output terminal of the protection circuit.
Working principle: in the utility model, a 5V power supply is formed by a silicon controlled rectifier U1, a resistor R1 and a resistor R2 for use by a later-stage circuit, a 2.5V accurate power supply is independently formed by the silicon controlled rectifier U2 for use by a temperature measuring circuit, a temperature measuring and in-phase proportional amplifying circuit is formed by an amplifier U3A, a thermistor RT1, a resistor R9, a resistor R6 and a resistor R7, when the temperature of a battery is increased, the resistance value of the thermistor RT1 is reduced, the voltage at two ends of the resistor R6 is increased, the output voltage of an 8 pin of the amplifier U3A is increased, the amplifier U3B, the resistor R9 and the resistor R10 form a voltage hysteresis comparison circuit, the upper threshold voltage and the lower threshold voltage can be respectively calculated according to different values (VOH or VOL) of the output voltage, when the temperature is increased, the resistance value of the thermistor RT1 is reduced, the temperature measuring output voltage is increased, when the temperature is greater than the upper threshold voltage, the amplifier U3B outputs a low level, a triode Q1 is turned off, and a field effect transistor Q2 and a field effect transistor Q3 are turned off simultaneously due to the increase of the grid voltage, and then the battery is cut off; when the temperature drops, the resistance of the thermistor RT1 is increased, the temperature measurement output voltage is reduced, when the temperature measurement output voltage is smaller than the lower threshold voltage, the amplifier U3B outputs a high level, the triode Q1 is conducted, the field effect transistor Q2 and the field effect transistor Q3 are simultaneously conducted due to the reduction of the grid voltage, and then the battery is connected, so that the over-temperature power-off and fault self-recovery functions of the battery pack can be realized.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims (6)

1. A temperature protection circuit for an electric vehicle charger, wherein the temperature protection circuit is connected between a power supply and a battery pack;
the temperature protection circuit includes: the primary side flyback transformer circuit is connected with the power supply, the transformer and the input end are connected with the primary side flyback transformer circuit, the rectifying circuit, the input end is connected with the output end of the transformer, the amplifying circuit and the output end of the rectifying circuit, the electronic switch and the output end of the amplifying circuit are connected, the output end of the amplifying circuit is connected with the battery pack, the isolating circuit is connected with the primary side flyback transformer circuit and the rectifying circuit, the temperature grading regulating circuit is connected with the output end of the isolating circuit, the protecting circuit is connected with the electronic switch, the temperature sensor is connected between the protecting circuit and the temperature grading regulating circuit.
2. A temperature protection circuit for an electric vehicle charger according to claim 1, wherein said protection circuit comprises: the resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8, the resistor R9, the resistor R10, the resistor R11, the resistor R12, the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4, the amplifier U3A, the amplifier U3B, the thermistor RT1 and the triode Q1;
one end of the controllable silicon U1 is connected with one end of the resistor R1, the other end of the controllable silicon U1 is connected with one end of the resistor R2, the control end of the controllable silicon U1 is simultaneously connected with the other end of the resistor R1 and the other end of the resistor R2, one end of the capacitor C1 is simultaneously connected with one end of the resistor R1 and one end of the resistor R3, the other end of the capacitor C1 is simultaneously connected with one end of the resistor R2 and one end of the resistor R4, one end of the resistor R5 is simultaneously connected with one end of the controllable silicon U2, the control end and one end of the thermistor RT1, the other end of the thermistor RT1 is simultaneously connected with one end of the resistor R6 and one end of the capacitor C2 and the in-phase input end of the amplifier U3A, the positive voltage end of the amplifier U3A is simultaneously connected with the other end of the resistor R5 and one end of the resistor R3A, the inverting input end of the amplifier U3A is simultaneously connected with one end of the resistor R7 and one end of the resistor R8 and one end of the capacitor C3, the negative voltage end of the amplifier U3A is simultaneously connected with the other end of the resistor R7, the other end of the capacitor C2, the other end of the resistor R6, the other end of the resistor R4 and the other end of the silicon controlled rectifier U2, the output end of the amplifier U3A is simultaneously connected with the other end of the resistor R8, the other end of the capacitor C3 and one end of the resistor R10, the non-inverting input end of the amplifier U3B is simultaneously connected with the other end of the resistor R3 and the other end of the resistor R4, the inverting input end of the amplifier U3B is simultaneously connected with the other end of the resistor R10, one end of the resistor R9 and one end of the capacitor C4, the output end of the amplifier U3B is simultaneously connected with the other end of the resistor R9, the other end of the capacitor C4 and one end of the resistor R11, the base of the triode Q1 is simultaneously connected with the other end of the resistor R11 and one end of the resistor R12, the incident electrode of the triode Q1 outputs positive voltage, and the emitting electrode of the triode Q1 is simultaneously connected with the other end of the resistor R12 and the negative voltage end of the amplifier U3A and outputs negative voltage.
3. The temperature protection circuit for an electric vehicle charger of claim 1, wherein a filter capacitor is disposed between the temperature protection circuit and the power supply, the filter capacitor being connected between the power supply and the primary flyback converter circuit.
4. A temperature protection circuit for an electric vehicle charger according to claim 1, wherein said isolation circuit is constituted by a photo-isolator.
5. A temperature protection circuit for an electric vehicle charger according to claim 1, wherein the electronic switch is composed of two P-channel enhancement field effect transistors Q2 and Q3 having ultra-low on-resistance.
6. The temperature protection circuit for an electric vehicle charger according to claim 5, wherein the field effect transistor Q2 is connected to an input terminal of the protection circuit, and the field effect transistor Q3 is connected to an output terminal of the protection circuit.
CN202320504577.0U 2023-03-16 2023-03-16 Temperature protection circuit for electric vehicle charger Active CN219544540U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202320504577.0U CN219544540U (en) 2023-03-16 2023-03-16 Temperature protection circuit for electric vehicle charger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202320504577.0U CN219544540U (en) 2023-03-16 2023-03-16 Temperature protection circuit for electric vehicle charger

Publications (1)

Publication Number Publication Date
CN219544540U true CN219544540U (en) 2023-08-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202320504577.0U Active CN219544540U (en) 2023-03-16 2023-03-16 Temperature protection circuit for electric vehicle charger

Country Status (1)

Country Link
CN (1) CN219544540U (en)

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