CN214204915U - Circuit with overcurrent protection function - Google Patents
Circuit with overcurrent protection function Download PDFInfo
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- CN214204915U CN214204915U CN202120316303.XU CN202120316303U CN214204915U CN 214204915 U CN214204915 U CN 214204915U CN 202120316303 U CN202120316303 U CN 202120316303U CN 214204915 U CN214204915 U CN 214204915U
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Abstract
The utility model discloses a circuit with overcurrent protection function, the circuit with overcurrent protection function include level conduction switch element, control chip U1, power output end, power input end, load output end and resistance R1, the control conduction switch end of level conduction switch element is connected with the control level pin of control chip U1, the input end of the controlled loop of level conduction switch element is connected with power input end, the output end of the controlled loop of level conduction switch element is connected with load input end, the overcurrent protection pin of automatic input compensation of control chip U1 is connected with the common end of resistance R1 and load output end, the utility model discloses it adopts MCU to detect the current that the sampling resistor on the main loop flows through to go to the break-make of level conduction switch element on the main loop in order to reach protect function, the circuit structure reduces the production cost.
Description
Technical Field
The utility model discloses a circuit with protect function, especially a circuit with overcurrent protection function belongs to domestic appliance control circuit technical field.
Background
In order to ensure the safe and reliable operation of the power supply system, a protection device must be installed so as to monitor the working condition of the power supply system, find out a fault in time and cut off the power supply of the fault equipment, thereby preventing the expansion of the accident. Certain redundancy is reserved when the power electronic switching device is selected, so that the safe and reliable use of the device is ensured. Meanwhile, a protection circuit is also needed to prevent the device from being damaged due to the occurrence of faults. Overcurrent protection is achieved by connecting a fast fuse in series in the circuit, and is suitable for thyristors and GTOs because of their high surge current carrying capacity. For MOSFET, GTR and IGBT, because of their low overcurrent bearing capacity, special overcurrent protection circuit is necessary, and the overcurrent protection circuit is required to complete overcurrent detection, signal transmission and protection in a moment, and the current is limited within the overload capacity within microsecond time.
At present, the circuit structure of the circuit with the overcurrent protection function on the market is complex, and the required power electronic components are more, so that the circuit cost is high.
Disclosure of Invention
To the problem that the circuit with overcurrent protection function is with high costs among the above-mentioned prior art, the utility model provides a circuit with overcurrent protection function, it adopts the sampling resistance current that MCU detection main loop went through to go the break-make of level conduction switch element on the control main loop in order to reach protect function, its circuit structure has reduced manufacturing cost.
The utility model provides a technical scheme that its technical problem adopted is: a circuit with an overcurrent protection function comprises a level conduction switch element, a control chip U1, a power output end, a power input end, a load output end and a resistor R1, wherein the control conduction switch end of the level conduction switch element is connected with a control level pin of a control chip U1, the input end of a controlled loop of the level conduction switch element is connected with the power output end, the output end of the controlled loop of the level conduction switch element is connected with the load input end, an automatic input compensation overcurrent protection pin of the control chip U1 is connected with the common end of the resistor R1 and the load output end, one end of the resistor R1 is connected with the power input end, the other end of the resistor R1 is connected with the load output end, and the power input pin of the control chip U1 is connected with the power output end.
The level conducting switch element is a PMOS transistor, the grid electrode of the PMOS transistor is connected with a control level pin of the control chip U1, the source electrode of the PMOS transistor is connected with the power supply output end, and the drain electrode of the PMOS transistor is connected with the load input end.
The level conducting switch element is an NMOS transistor, the grid electrode of the NMOS transistor is connected with a control level pin of a control chip U1, the source electrode of the NMOS transistor is connected with the power supply output end, and the drain electrode of the NMOS transistor is connected with the load input end.
The level conducting switch element is an NPN type triode, the base electrode of the NPN type triode is connected with a control level pin of the control chip U1, the collector electrode of the NPN type triode is connected with the power supply output end, and the emitter electrode of the NPN type triode is connected with the load input end.
The level switch-on switch element is a PNP type triode, the base of the PNP type triode is connected with a control level pin of the control chip U1, the emitting electrode of the PNP type triode is connected with the power output end, and the collecting electrode of the PNP type triode is connected with the load input end.
The input end of the controlled loop of the level conducting switch element and the control conducting switch end of the level conducting switch element are connected with a resistor R3.
A resistor R2 is connected between the power output end and a power input pin of the control chip U1, a capacitor C1 is connected with the common end of the resistor R2 and the power input pin of the control chip U1, and a capacitor C1 is connected with the power input end.
The overcurrent protection pin for automatic input compensation of the control chip U1 is connected with the load output end through a resistor R4, and the overcurrent protection pin for automatic input compensation of the control chip U1 is connected with the power supply input end through a capacitor C10.
The utility model has the advantages that: the utility model discloses circuit with overcurrent protection adopts MCU to detect the electric current that the sampling resistor on the major loop flowed through to go the break-make of level switch on switch element on the control major loop in order to reach protect function, its circuit structure has also reduced manufacturing cost.
The present invention will be further described with reference to the accompanying drawings and the detailed description.
Drawings
Fig. 1 is a block diagram of the circuit of the present invention.
Fig. 2 is a schematic circuit diagram of the present invention with overcurrent protection function.
Detailed Description
The embodiment is a preferred embodiment of the present invention, and other principles and basic structures are the same as or similar to those of the embodiment, and are within the protection scope of the present invention.
Referring to fig. 1 to fig. 2, the present invention is a circuit with overcurrent protection function, the circuit with the overcurrent protection function comprises a level conduction switch element, a control chip U1, a power supply output end, a power supply input end, a load output end and a resistor R1, wherein the control conduction switch end of the level conduction switch element is connected with a control level pin of the control chip U1, the input end of a controlled loop of the level conduction switch element is connected with the power supply output end, the output end of the controlled loop of the level conduction switch element is connected with the load input end, an automatic input compensation overcurrent protection pin of the control chip U1 is connected with a common end of the resistor R1 and the load output end, one end of the resistor R1 is connected with the power supply input end, the other end of the resistor R1 is connected with the load output end, and the power supply input pin of the control chip U1 is connected with the power supply output end. Through the method, the current flowing through the sampling resistor on the main loop is detected by the MCU, so that the on-off of the level conduction switch element on the main loop is controlled to achieve the protection function.
In this embodiment, the level-on switch element is a PMOS transistor, a gate of the PMOS transistor is connected to the control level pin of the control chip U1, a source of the PMOS transistor is connected to the power output terminal, and a drain of the PMOS transistor is connected to the load input terminal. By the above, the level-on switching element is turned on at a low level.
In this embodiment, the level-on switch element is an NMOS transistor, a gate of the NMOS transistor is connected to a control level pin of the control chip U1, a source of the NMOS transistor is connected to the power output terminal, and a drain of the NMOS transistor is connected to the load input terminal. By the above, the level-on switching element is turned on at a high level.
In this embodiment, the level-switching element is an NPN type transistor, a base of the NPN type transistor is connected to the control level pin of the control chip U1, a collector of the NPN type transistor is connected to the power output terminal, and an emitter of the NPN type transistor is connected to the load input terminal. By the above, the level-on switching element is turned on at a high level.
In this embodiment, the level-on switch element is a PNP type triode, a base of the PNP type triode is connected to a control level pin of the control chip U1, an emitter of the PNP type triode is connected to the power output terminal, and a collector of the PNP type triode is connected to the load input terminal. By the above, the level-on switching element is turned on at a low level.
In this embodiment, the input end of the controlled loop of the level-on switching element and the control conducting switch end of the level-on switching element are connected to a resistor R3. By the above, the bias voltage is supplied to the field effect transistor.
In this embodiment, a resistor R2 is connected between the power output terminal and the power input pin of the control chip U1, a capacitor C1 is connected to a common terminal of the resistor R2 and the power input pin of the control chip U1, and a capacitor C1 is connected to the power input terminal.
In this embodiment, the overcurrent protection pin for automatic input compensation of the control chip U1 is connected to the load output terminal through the resistor R4, and the overcurrent protection pin for automatic input compensation of the control chip U1 is connected to the power input terminal through the capacitor C10.
In this embodiment, the control chip U1 has a model of CSS21P 10.
In this embodiment, VIN + is the power output terminal, VIN-is the power input terminal, OUT + is the load input terminal, and OUT-is the load output terminal.
In this embodiment, when the input voltage is connected to the two terminals VIN + and VIN-, the input voltage supplies power to the control chip U1 through the resistor R2, and then the control level pin of the control chip U1 outputs a low level or a high level to turn on the level-conducting switch element Q2, and the input voltage is transmitted to the output OUT + and OUT-through the level-conducting switch element Q2 and the resistor R1. When the negative currents at the two ends of the output OUT + and the output OUT-are increased and are larger than the set OCP value, the current flowing through the resistor R1 is also increased, so that the voltage difference at the two ends of the resistor R1 is also increased, the voltage is transmitted to an automatic input compensation overcurrent protection pin of the control chip U1 through the resistor R4, the control chip U1 converts an analog voltage signal into a binary mechanical code through software, and then the binary mechanical code is compared through an internal reference value, and when the voltage is larger than the set value, the level of a control level pin of the control chip U1 is changed from low level to high level or from high level to low level, so that the level of the control level pin is turned on to turn off the switch element Q2, thereby disconnecting the current main loop and playing a protection role.
The above is only the preferred embodiment of the present invention, the present invention is not limited to the above embodiment, and the technical solution of the present invention is all within the protection scope of the present invention as long as the present invention is realized by the substantially same means.
Claims (8)
1. A circuit with overcurrent protection function, its characterized in that: the circuit with the overcurrent protection function comprises a level conduction switch element, a control chip U1, a power supply output end, a power supply input end, a load output end and a resistor R1, wherein the control conduction switch end of the level conduction switch element is connected with a control level pin of the control chip U1, the input end of a controlled loop of the level conduction switch element is connected with the power supply output end, the output end of the controlled loop of the level conduction switch element is connected with the load input end, an automatic input compensation overcurrent protection pin of the control chip U1 is connected with a common end of the resistor R1 and the load output end, one end of the resistor R1 is connected with the power supply input end, the other end of the resistor R1 is connected with the load output end, and the power supply input pin of the control chip U1 is connected with.
2. The circuit with overcurrent protection function according to claim 1, wherein: the level conducting switch element is a PMOS transistor, the grid electrode of the PMOS transistor is connected with a control level pin of the control chip U1, the source electrode of the PMOS transistor is connected with the power supply input end, and the drain electrode of the PMOS transistor is connected with the load input end.
3. The circuit with overcurrent protection function according to claim 1, wherein: the level conducting switch element is an NMOS transistor, the grid electrode of the NMOS transistor is connected with a control level pin of a control chip U1, the source electrode of the NMOS transistor is connected with the power supply input end, and the drain electrode of the NMOS transistor is connected with the load input end.
4. The circuit with overcurrent protection function according to claim 1, wherein: the level conducting switch element is an NPN type triode, the base electrode of the NPN type triode is connected with a control level pin of the control chip U1, the collector electrode of the NPN type triode is connected with the power supply input end, and the emitter electrode of the NPN type triode is connected with the load input end.
5. The circuit with overcurrent protection function according to claim 1, wherein: the level switch-on switch element is a PNP type triode, the base electrode of the PNP type triode is connected with the control level pin of the control chip U1, the emitting electrode of the PNP type triode is connected with the power input end, and the collecting electrode of the PNP type triode is connected with the load input end.
6. The circuit with overcurrent protection function according to claim 1, wherein: and a resistor R3 is connected between the input end of the controlled loop of the level conducting switch element and the control conducting switch end of the level conducting switch element.
7. The circuit with overcurrent protection function according to claim 1, wherein: a resistor R2 is connected between the power output end and a power input pin of the control chip U1, a capacitor C1 is connected with the common end of the resistor R2 and the power input pin of the control chip U1, and a capacitor C1 is connected with the power input end.
8. The circuit with overcurrent protection function according to claim 1, wherein: the overcurrent protection pin for automatic input compensation of the control chip U1 is connected with the load output end through a resistor R4, and the overcurrent protection pin for automatic input compensation of the control chip U1 is connected with the power supply input end through a capacitor C10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120316303.XU CN214204915U (en) | 2021-02-04 | 2021-02-04 | Circuit with overcurrent protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120316303.XU CN214204915U (en) | 2021-02-04 | 2021-02-04 | Circuit with overcurrent protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214204915U true CN214204915U (en) | 2021-09-14 |
Family
ID=77638939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120316303.XU Active CN214204915U (en) | 2021-02-04 | 2021-02-04 | Circuit with overcurrent protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214204915U (en) |
-
2021
- 2021-02-04 CN CN202120316303.XU patent/CN214204915U/en active Active
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Address after: Room 602, Introduction Building, District 71, Xingdong Community, Xin'an Street, Bao'an District, Shenzhen, Guangdong, 518000 Patentee after: SHENZHEN LANFENG SHIDAI INDUSTRIAL CO.,LTD. Address before: 1205, Jinqi Zhigu building, No.1, tangling Road, Liuxian Avenue, Nanshan District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN LANFENG SHIDAI INDUSTRIAL CO.,LTD. |