Battery charging state identification circuit in electric vehicle charger
By constructing a battery charging state recognition circuit by using optocoupler components in the electric vehicle charger, the problem of low silicon recognition efficiency and unsatisfactory battery polarity is solved, and the function of efficient identification and automatic power off has been realized.
Patent Information
- Application Number
- CN202421207834.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-30
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-05-30
AI Technical Summary
In the prior art, when Thyristor is used for battery status recognition, the recognition efficiency is low, the battery polarity cannot be recognized, and automatic power outage cannot be achieved.
The optical coupling component is used instead of pure thyristor, and the battery charging state recognition circuit is constructed through the first and second -optical coupling devices, field effect tube and other components to achieve fast -tole and automatic power off -power disconnection function.
It improves the efficiency of battery charging state recognition, can quickly identify the battery polarity, and automatically disconnects the power when the battery is fully charged to avoid charging accidents.
Smart Images
Figure CN222407965U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of electricity, in particular to an electronic circuit, in particular to a battery charging state identification circuit in an electric vehicle charger. Background Art
[0002] Electric vehicles are one of the important means of transportation for human life and travel. At present, the batteries used in the electric vehicle industry are mostly lead-acid batteries and lithium batteries. The matching chargers use a constant voltage charging method. After the battery is fully charged, the charging voltage does not decrease, which can easily cause charging accidents. The traditional battery status recognition circuit in the prior art is passively realized through thyristors, that is, after the battery is connected, the main charging circuit is opened using the characteristics of thyristors, which has the problems of too much material and low efficiency; due to the large voltage drop of thyristors, there is a tailing effect, and the circuit cannot be quickly turned on and off; in addition, the polarity and charging status of the battery cannot be identified through thyristors, and the automatic power-off function cannot be realized. Summary of the invention
[0003] The utility model aims to provide a battery charging state identification circuit in an electric vehicle charger, which solves the technical problems in the prior art of low thyristor identification efficiency, inability to identify battery polarity, and inability to automatically cut off power.
[0004] The battery charging state identification circuit in the electric vehicle charger of the utility model comprises a first optocoupler device, a second optocoupler device, a first diode and a second diode, wherein the positive electrode of the light-emitting diode in the first optocoupler device is connected to the negative electrode of the first diode, the positive electrode of the first diode is connected to a positive terminal of a battery, the negative electrode of the light-emitting diode in the first optocoupler device is connected to one end of a first resistor, the other end of the first resistor is connected to a negative terminal of a battery, the collector in the first optocoupler device is connected to a first CPU signal terminal, the emitter in the first optocoupler device is grounded, the positive electrode of the light-emitting diode in the second optocoupler device is connected to the negative electrode of the second diode, the positive electrode of the second diode is connected to the negative terminal of the battery, the negative electrode of the light-emitting diode in the second optocoupler device is connected to one end of a second resistor, the other end of the second resistor is connected to the positive terminal of the battery, the collector of the second optocoupler device is connected to a second CPU signal terminal, and the emitter of the second optocoupler device is grounded.
[0005] Furthermore, the battery charging status identification circuit in the electric vehicle charger also includes a first field effect tube and a second field effect tube, the source of the first field effect tube is connected to the positive terminal of the battery, the drain of the first field effect tube is connected to a power input terminal, the drain of the second field effect tube is connected to the negative terminal of the battery, the source of the second field effect tube is connected to one end of a third resistor, and the other end of the third resistor is grounded.
[0006] The working principle of the utility model is as follows: a battery is inserted between the positive terminal and the negative terminal of the battery. If the battery connection polarity is normal, the first optical coupler device is activated, the potential of the first CPU signal terminal is pulled low, and the battery status is known by the CPU. When the battery is low in power, the CPU control system charges the battery. When the battery is fully charged, the potential of the first CPU signal terminal returns to a high level, the battery status is known by the CPU, and the CPU control system stops charging the battery. If the battery connection polarity is abnormal, the second optical coupler device is activated, the potential of the second CPU signal terminal is pulled low, the battery status is known by the CPU, and the CPU control system does not charge the battery.
[0007] Compared with the prior art, the utility model has positive and obvious effects: the utility model adopts optical coupling elements instead of pure thyristors to construct a circuit to identify the battery charging status, has a fast switching speed, high identification efficiency, can identify the battery polarity, and can automatically cut off the power when the battery is fully charged. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 The utility model discloses a circuit diagram of a battery charging state identification circuit in an electric vehicle charger. DETAILED DESCRIPTION
[0009] The following embodiments will further illustrate the present invention, but are not intended to limit the present invention.
[0010] like Figure 1The present embodiment provides a battery charging state identification circuit in an electric vehicle charger, comprising a first optocoupler device U1, a second optocoupler device U2, a first diode D1 and a second diode D2, wherein the anode of the light-emitting diode in the first optocoupler device U1 is connected to the cathode of the first diode D1, the anode of the first diode D1 is connected to a battery positive terminal BAT+, the cathode of the light-emitting diode in the first optocoupler device U1 is connected to one end of a first resistor R1, the other end of the first resistor R1 is connected to a battery negative terminal BAT-, the first optocoupler device U1 The collector of the first optocoupler U1 is connected to a first CPU signal terminal S1, the emitter of the first optocoupler U1 is grounded, the anode of the light-emitting diode in the second optocoupler U2 is connected to the cathode of the second diode D2, the anode of the second diode D2 is connected to the negative terminal BAT- of the battery, the cathode of the light-emitting diode in the second optocoupler U2 is connected to one end of a second resistor R2, the other end of the second resistor R2 is connected to the positive terminal BAT+ of the battery, the collector of the second optocoupler U2 is connected to a second CPU signal terminal S2, and the emitter of the second optocoupler U2 is grounded.
[0011] Furthermore, the battery charging status identification circuit in the electric vehicle charger also includes a first field effect transistor Q1 and a second field effect transistor Q2, the source of the first field effect transistor Q1 is connected to the positive terminal BAT+ of the battery, the drain of the first field effect transistor Q1 is connected to a power input terminal Vin, the drain of the second field effect transistor Q2 is connected to the negative terminal BAT- of the battery, the source of the second field effect transistor Q2 is connected to one end of a third resistor R3, and the other end of the third resistor R3 is grounded.
[0012] The working principle of this embodiment is as follows: the battery is inserted between the positive terminal BAT+ and the negative terminal BAT- of the battery. If the battery connection polarity is normal, the first optocoupler device U1 is activated, the potential of the first CPU signal terminal S1 is pulled low, and the battery status is known by the CPU. When the battery is low in power, the CPU control system charges the battery. When the battery is fully charged, the potential of the first CPU signal terminal S1 returns to a high level, the battery status is known by the CPU, and the CPU control system stops charging the battery. If the battery connection polarity is abnormal, the second optocoupler device U2 is activated, the potential of the second CPU signal terminal S2 is pulled low, the battery status is known by the CPU, and the CPU control system does not charge the battery.
[0013] Specifically, the first optocoupler device U1 and the second optocoupler device U2 are both optocouplers in the prior art.
[0014] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A battery charging status identification circuit in an electric vehicle charger, comprising a first optocoupler device, a second optocoupler device, a first diode and a second diode, characterized in that: The positive electrode of the light-emitting diode in the first optocoupler device is connected to the negative electrode of the first diode, the positive electrode of the first diode is connected to the positive terminal of a battery, the negative electrode of the light-emitting diode in the first optocoupler device is connected to one end of a first resistor, the other end of the first resistor is connected to the negative terminal of a battery, the collector in the first optocoupler device is connected to a first CPU signal terminal, the emitter in the first optocoupler device is grounded, the positive electrode of the light-emitting diode in the second optocoupler device is connected to the negative electrode of the second diode, the positive electrode of the second diode is connected to the negative terminal of the battery, the negative electrode of the light-emitting diode in the second optocoupler device is connected to one end of a second resistor, the other end of the second resistor is connected to the positive terminal of the battery, the collector in the second optocoupler device is connected to a second CPU signal terminal, and the emitter in the second optocoupler device is grounded.
2. The battery charging status identification circuit in an electric vehicle charger as claimed in claim 1, characterized in that: The battery charging state identification circuit in the electric vehicle charger also includes a first field effect tube and a second field effect tube, the source of the first field effect tube is connected to the positive terminal of the battery, the drain of the first field effect tube is connected to a power input terminal, the drain of the second field effect tube is connected to the negative terminal of the battery, the source of the second field effect tube is connected to one end of a third resistor, and the other end of the third resistor is grounded.