CN219643617U - Battery charging protection circuit - Google Patents
Battery charging protection circuit Download PDFInfo
- Publication number
- CN219643617U CN219643617U CN202320116177.2U CN202320116177U CN219643617U CN 219643617 U CN219643617 U CN 219643617U CN 202320116177 U CN202320116177 U CN 202320116177U CN 219643617 U CN219643617 U CN 219643617U
- Authority
- CN
- China
- Prior art keywords
- circuit
- light emitting
- input
- battery charging
- protection circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 description 5
- 101100236764 Caenorhabditis elegans mcu-1 gene Proteins 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model provides a battery charging protection circuit, which comprises an input circuit, a detection circuit connected to the input circuit and a comparison circuit connected with the detection circuit and the input circuit respectively, wherein the detection circuit comprises an optocoupler switch and a light emitting diode, and the input circuit, the detection circuit and the comparison circuit are arranged, when the input circuit is connected with correct polarity in the charging process, current is conducted along the optocoupler switch to enable the optocoupler switch to be opened and communicated with the detection circuit and the comparison circuit to be communicated with the input circuit, so as to form a conducting loop, and when the input circuit is connected with opposite polarity in the charging process, current is conducted along the light emitting diode and the optocoupler switch is closed and is not conducted with the comparison circuit, so that a conducting loop cannot be formed, and the purpose of reverse connection protection is achieved.
Description
Technical Field
The utility model belongs to the technical field of electronic circuits, and particularly relates to a battery charging protection circuit.
Background
With the development of society, electronic devices are visible everywhere, and circuits are an indispensable part of electronic devices, which deserves research.
In a battery charging system, the direct current has directivity, so that the positive and negative power supply cannot be connected reversely during operation, otherwise, the power supply or equipment can be damaged.
In the current battery charging system, most connectors are designed to be reverse connection-preventing, such as a diode is connected, so that the use effect is poor, however, the connectors are far from enough, in the actual wiring process, equipment is always damaged due to positive and negative reverse connection, and the reliability is not high.
Disclosure of Invention
Based on the above, the utility model aims to provide a battery charging protection circuit, which aims to solve the problems of poor reverse connection prevention design effect and low reliability in the prior art.
The utility model provides a battery charging protection circuit, which comprises an input circuit, a detection circuit connected to the input circuit and a comparison circuit connected with the detection circuit and the input circuit respectively, wherein the detection circuit comprises an optocoupler switch and a light emitting diode, the optocoupler switch comprises a light emitting part connected with the input circuit and a light receiving part connected with the comparison circuit, and the light emitting diode is arranged between the light emitting part and the input circuit;
when the connection polarity of the input circuit is correct in the charging process, the current enables the light emitting part to be conducted and is conducted after the light receiving part obtains the light signal, the optocoupler switch is turned on and is communicated with the detection circuit and the comparison circuit, and the comparison circuit is communicated with the input circuit to form a conducting loop;
when the connection polarity of the input circuit is opposite in the charging process, current is conducted along the light emitting diode, and no current passes through the light emitting part on the optocoupler switch, so that the light emitting part is closed.
According to the battery charging protection circuit, the input circuit, the detection circuit and the comparison circuit are arranged, when the connection polarity of the input circuit is correct in the charging process, the current is conducted along the optocoupler switch to enable the optocoupler switch to be opened and to be communicated with the detection circuit and the comparison circuit and the input circuit to form a conducting loop, when the connection polarity of the input circuit is opposite in the charging process, the current is conducted along the light emitting diode and the optocoupler switch is closed and is not conducted with the comparison circuit to form a conducting loop, and therefore the purpose of reverse connection protection is achieved.
Further, the input circuit comprises a battery charging end and a power input end electrically connected with the battery charging end, and an MOS tube is connected between the battery charging end and the power input end.
Further, the light emitting part is connected with the battery charging end, the light emitting diode is arranged between the light emitting part and the battery charging end, and a first protection circuit is connected in parallel between the light emitting part and the battery charging end.
Further, the first protection circuit and the output end of the light emitting diode are connected with a first resistor, and the battery charging end is connected with a first filter capacitor.
Further, the comparison circuit comprises a power supply and a micro control unit which are sequentially connected in parallel on the light receiving part circuit, and an inverter connected with the power supply.
Further, the power supply is connected with the input end of the inverter, a second resistor is connected between the power supply and the light receiving part, and a third resistor is connected between the micro control unit and the light receiving part.
Further, the output end of the inverter is connected with the grid electrode of the MOS tube.
Further, a fourth resistor is connected between the output end of the inverter and the grid electrode of the MOS tube, and a second filter capacitor is connected between the power input end and the MOS tube.
Other advantages and technical effects of a battery charge protection circuit according to the present utility model will be described in detail in the detailed description.
Drawings
Fig. 1 is a schematic structural diagram of a battery charging protection circuit according to an embodiment of the present utility model;
fig. 2 is a schematic circuit diagram of a battery charging protection circuit according to an embodiment of the present utility model;
the following detailed description will further illustrate the utility model with reference to the above-described drawings.
Detailed Description
In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Several embodiments of the utility model are presented in the figures. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of a battery charging protection circuit according to an embodiment of the present utility model, and fig. 2 is a schematic circuit diagram of the battery charging protection circuit according to an embodiment of the present utility model, wherein the battery charging protection circuit includes an input circuit, a detection circuit connected to the input circuit, and a comparison circuit connected to the detection circuit and the input circuit, respectively, the detection circuit includes an optocoupler switch U1 and a light emitting diode D1, when the input circuit is connected with correct polarity in a charging process, a current is conducted along the optocoupler switch U1 to turn on the optocoupler switch U1 and connect the detection circuit with the comparison circuit and the comparison circuit with the input circuit to form a conductive loop, and when the input circuit is connected with opposite polarity in a charging process, a current is conducted along the light emitting diode D1 and the optocoupler switch U1 is closed and is not conducted with the comparison circuit to form a conductive loop.
Further, the input circuit includes a battery charging end and a power input end electrically connected with the battery charging end, the battery charging end includes a bat+ and a bat-disposed on a battery, the power input end includes a dcin+ and a DCIN-communicated with a power VCC, a MOS tube Q1 is connected between the battery charging end and the power input end, wherein the MOS tube Q1 is disposed between the DCIN-and the bat-for avoiding high voltage generated when a subsequent polarity error occurs to control the MOS tube Q1 to open and close, the optocoupler switch U1 includes a light emitting portion connected with the battery charging end and a light receiving portion connected with a comparison circuit, in this embodiment, the light emitting portion may be a second light emitting diode identical to the light emitting diode D1, and the optocoupler is also referred to as a photo-isolator or a photo-coupler, simply referred to as an optocoupler. The device uses light as medium to transmit electric signal, usually packages the light emitter (infrared light emitting diode LED) and light receiver (photosensitive semiconductor tube, photosensitive resistor) in the same tube, when the input end is powered up, the light emitter emits light, the light receiver receives light to generate photocurrent, and flows out from the output end, thus realizing 'electro-photo-electro' control, the light emitting diode D1 is arranged between the light emitting part and the battery charging ends BATT+ and BATT-, and the first protection circuit Z1 is connected in parallel between the light emitting part and the battery charging ends, in the alternative embodiment of the utility model, Z1 is TVS also called transient voltage-like diode, the main function is clamping battery voltage, the output ends of the first protection circuit Z1 and the light emitting diode D1 are connected with a first resistor R1, wherein R1 mainly acts as a current limiting resistor of the ab input end of the photo-coupling switch U1, the second light emitting diode inside the opto-coupler switch U1 is prevented from being damaged, a first filter capacitor C1 is further connected between the battery charging ends BATT+ and BATT-, the comparison circuit comprises a power supply VCC and a micro control unit MCU1 which are sequentially connected in parallel on the circuit of the output end of the light receiving part cd and an inverter U2 connected with the power supply, the power supply VCC is connected with the input end of the inverter U2, a second resistor R2 is connected between the power supply VCC and the end of the light receiving part cd, wherein R2 mainly acts as the current limiting resistor of the cd end of the opto-coupler switch U1 and U2, the transistor inside the opto-coupler switch U1 is prevented from being damaged, a third resistor R3 is connected between the micro control unit MCU1 and the end of the light receiving part cd, wherein R3 mainly has the current limiting function, a driving signal of the MOS tube Q1 is transmitted to the MCU1, the output end of the inverter U2 is connected with the grid of the MOS tube Q1, a fourth resistor R4 is connected between the output end of the inverter U2 and the grid electrode of the MOS tube, wherein the R4 mainly acts as the grid electrode resistor of the MOS tube Q1, and a second filter capacitor C2 is connected between the power input end and the MOS tube Q1, wherein the C2 is the grid electrode capacitor of the MOS tube, and erroneous conduction is prevented.
IN the implementation, when the battery charging terminals batt+ and BATT-are not connected with the battery, the voltage ab at the input terminal of the opto-coupler switch U1 is 0, and the two ends of the output terminal cd of the opto-coupler switch U1 are not conducted, so that the voltage at the U2-1 connected with the power VCC is equal to the voltage of the power VCC, and when the voltage exists at the U2-1 due to the fact that the U2 is the output of the inverter, the voltage is not output at the U2-2, and therefore the MOS transistor Q1 connected with the U2-2 is turned off when no voltage is output, and the corresponding DC IN-to-BATT-is disconnected. Therefore, no voltage is output between the battery connection ends BATT+ and BATT-where the polarity is correct, if the polarity of BATT+ and BATT-where the ab end of the opto-coupler switch U1 is switched on, the cd end of the opto-coupler switch is switched on, when the voltage at the power supply VCC is switched on along the DCIN-of the cd end after the cd end is switched on, the voltage at the power supply VCC is enabled to be 0 when the voltage reaches the U2-1, the U2-2 end outputs a high level through the inverter U2, so that the MOS transistor Q1 is switched on, the corresponding DC IN-where the BATT is switched on, the BATT+ and the BATT-where the polarity is reversed, the light emitting diode D1 is switched on, the opto-coupler switch U1 is switched off, and the MOS transistor Q1 is switched off IN the same way as the current conduction mode after the photo-coupler switch U1 is switched off when the battery charging end BATT+ and the BATT-where the battery are not connected, and the light emitting diode D1 is switched on and the light emitting diode and the BATT-where the light emitting diode is enabled to be switched off, and the data of the microcontroller can be transmitted to the MCU1 through the feedback circuit.
In summary, the battery charging protection circuit provided by the utility model has the advantages that the input circuit, the detection circuit and the comparison circuit are arranged, when the input circuit is connected with correct polarity in the charging process, the current is conducted along the optocoupler switch U1 to enable the optocoupler switch U1 to be opened and communicated with the detection circuit and the comparison circuit to be communicated with the input circuit, a conducting loop is formed, when the input circuit is connected with opposite polarity in the charging process, the current is conducted along the light emitting diode D1 and the optocoupler switch U1 is closed and is not conducted with the comparison circuit, and a conducting loop cannot be formed, so that the purpose of reverse connection protection is achieved, the conducting of the U1 determines the conducting opening and closing of the MOS tube Q1 which is connected with the input circuit at present, the MOS tube Q1 has better circuit protection effect, the situation that high level generated after the reverse connection circuit is damaged is avoided, the reliability of reverse connection prevention design is improved to a certain extent, and the problem that in the battery charging system at present, most connectors are in reverse connection prevention design, such as a diode is connected, and the reliability of use effect is not high is solved.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing examples illustrate only a few embodiments of the utility model and are described in detail herein without thereby limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (8)
1. The battery charging protection circuit is characterized by comprising an input circuit, a detection circuit connected to the input circuit and a comparison circuit connected with the detection circuit and the input circuit respectively, wherein the detection circuit comprises an optocoupler switch and a light emitting diode, the optocoupler switch comprises a light emitting part connected with the input circuit and a light receiving part connected with the comparison circuit, and the light emitting diode is arranged between the light emitting part and the input circuit;
when the connection polarity of the input circuit is correct in the charging process, the current enables the light emitting part to be conducted and is conducted after the light receiving part obtains the light signal, the optocoupler switch is turned on and is communicated with the detection circuit and the comparison circuit, and the comparison circuit is communicated with the input circuit to form a conducting loop;
when the connection polarity of the input circuit is opposite in the charging process, current is conducted along the light emitting diode, and no current passes through the light emitting part on the optocoupler switch, so that the light emitting part is closed.
2. The battery charge protection circuit of claim 1, wherein the input circuit comprises a battery charging end and a power input end electrically connected with the battery charging end, and a MOS tube is connected between the battery charging end and the power input end.
3. The battery charge protection circuit of claim 2, wherein the light emitting portion is connected to the battery charging terminal, the light emitting diode is disposed between the light emitting portion and the battery charging terminal, and a first protection circuit is further connected in parallel between the light emitting portion and the battery charging terminal.
4. The battery charge protection circuit of claim 3, wherein the first protection circuit and the light emitting diode output terminal are connected with a first resistor, and the battery charge terminal is connected with a first filter capacitor.
5. The battery charge protection circuit according to claim 4, wherein the comparison circuit includes a power supply and a micro control unit connected in parallel to the light receiving section circuit in sequence, and an inverter connected to the power supply.
6. The battery charge protection circuit according to claim 5, wherein the power supply is connected to an input terminal of the inverter, a second resistor is connected between the power supply and the light receiving portion, and a third resistor is connected between the micro control unit and the light receiving portion.
7. The battery charge protection circuit of claim 6, wherein the inverter output is connected to the MOS transistor gate.
8. The battery charge protection circuit of claim 7, wherein a fourth resistor is connected between the inverter output and the MOS transistor gate, and a second filter capacitor is connected between the power input and the MOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320116177.2U CN219643617U (en) | 2023-01-19 | 2023-01-19 | Battery charging protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320116177.2U CN219643617U (en) | 2023-01-19 | 2023-01-19 | Battery charging protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219643617U true CN219643617U (en) | 2023-09-05 |
Family
ID=87818326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320116177.2U Active CN219643617U (en) | 2023-01-19 | 2023-01-19 | Battery charging protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219643617U (en) |
-
2023
- 2023-01-19 CN CN202320116177.2U patent/CN219643617U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11205880B1 (en) | Socket and door with same | |
| CN206164085U (en) | Direct -current input surge suppression circuit | |
| CN219643617U (en) | Battery charging protection circuit | |
| US11128126B2 (en) | Internal voltage-canceling circuit and USB device using the same | |
| CN208386141U (en) | output protecting device and terminal controller | |
| CN101222147A (en) | Electric voltage reverse-connection protection circuit | |
| CN215419641U (en) | Communication system | |
| CN207588827U (en) | A kind of self-locking power switch device | |
| CN203368051U (en) | Charging control circuit and television | |
| CN110445242A (en) | Power supply switch circuit | |
| CN201025484Y (en) | Testing device for voltage sudden wave | |
| CN209964332U (en) | PhotoMOS drive circuit with high reliability | |
| CN218526094U (en) | Circuit structure for realizing three-state control by using power line | |
| CN201955777U (en) | Data switching equipment | |
| CN111879987B (en) | High-voltage-resistant isolated contact detection circuit | |
| CN214310843U (en) | Dry-wet contact integrated input detection circuit | |
| CN218300472U (en) | Patch board | |
| CN107508475A (en) | A kind of robot electric power system | |
| CN112866875B (en) | Startup and shutdown anti-impact circuit for digital audio processor | |
| CN212845680U (en) | Direct current switching value detection circuit with electrical protection function | |
| CN217562479U (en) | Intelligent electronic direct current contactor and electrical equipment | |
| CN215575534U (en) | Direct current injection type detection circuit, power battery output circuit and electric automobile | |
| WO2023198070A1 (en) | Anti-reverse-flow control circuit for in-vehicle redundant power source, and vehicle controller and vehicle | |
| CN216121899U (en) | Hardware self-adaption double-battery switching circuit based on handheld terminal | |
| CN218647796U (en) | Switch detection circuit and electronic switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |