CN213661197U - Short-circuit protection circuit based on Hall current sensor and voltage comparator - Google Patents
Short-circuit protection circuit based on Hall current sensor and voltage comparator Download PDFInfo
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- CN213661197U CN213661197U CN202022849446.5U CN202022849446U CN213661197U CN 213661197 U CN213661197 U CN 213661197U CN 202022849446 U CN202022849446 U CN 202022849446U CN 213661197 U CN213661197 U CN 213661197U
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Abstract
The utility model discloses a short-circuit protection circuit based on Hall current sensor and voltage comparator, Hall current sensor connects overcurrent threshold value comparator, and overcurrent threshold value comparator connects the latch, and the latch connects the power reset circuit, and the latch electricity is connected signal switch circuit, and signal switch circuit connects the power switch circuit, and the power switch circuit connects the load; the Hall current sensor outputs an analog level to be sent to a positive phase input end of the overcurrent threshold comparator, the power switch circuit comprises a power switch PMOS tube, and a direct current power supply is connected in series to an S electrode of the power switch PMOS tube through two acquisition ports of the Hall current sensor and is used for providing a high-end drive output to the direct current power supply. The utility model discloses a series connection hall current sensor detects and overflows threshold value latch and turn-off MOS control signal, and turn-off fast when MOS pipe overflows, protection MOS pipe avoids burning out the circuit and causes equipment trouble.
Description
Technical Field
The utility model relates to the technical field of circuits, concretely relates to short-circuit protection circuit based on hall current sensor and voltage comparator.
Background
In a circuit using a common field effect transistor (MOS tube) as a switch, when the MOS tube is opened, conduction and internal resistance between a source electrode and a drain electrode are small, if the drain electrode serving as an output end is short-circuited to the ground, current between the source electrode and the drain electrode instantly rises to a large value, and the MOS tube is burnt. Therefore, the MOS transistor lacks the overload capability of the circuit, and when the circuit where the MOS transistor is located has a short circuit or an overcurrent fault, the MOS transistor is very easily broken down, and the control circuit is very easily out of control.
Disclosure of Invention
The utility model provides a short-circuit protection circuit based on hall current sensor and voltage comparator detects through series connection hall current sensor and overflows threshold value latch and turn-off MOS control signal, and turn-off fast when MOS pipe overflows, protection MOS pipe avoids burning out the circuit and causes equipment trouble.
An embodiment of the utility model provides a short-circuit protection circuit based on hall current sensor and voltage comparator. The method comprises the following steps: the output end of the Hall current sensor is electrically connected with the input end of an overcurrent threshold comparator, the overcurrent threshold comparator is electrically connected with the input end of a latch, the latch is connected with a power supply reset circuit, the output end of the latch is electrically connected with the input end of a signal switching circuit, the output end of the signal switching circuit is electrically connected with the input end of a power switching circuit, and the output end of the power switching circuit is connected with a load; the Hall current sensor outputs an analog level to be sent to a positive phase input end of the overcurrent threshold comparator, the power switch circuit comprises a power switch PMOS tube, and a direct current power supply is connected in series to an S electrode of the power switch PMOS tube through two acquisition ports of the Hall current sensor and is used for providing a high-end drive output to the direct current power supply.
Preferably, the output end of the latch is connected with the cathode of the fault low-level turn-off diode, and the MOS switch driving signal is input into the anode of the fault low-level turn-off diode through the divider resistor.
Preferably, the anode of the fault low-level turn-off diode is connected with the reference voltage divider resistor.
Preferably, the positive pole of the fault low-level turn-off diode is connected with a pull-down resistor.
Preferably, the signal switch circuit comprises a signal switch PMOS tube, and the signal switch PMOS tube is connected with the voltage dividing resistor.
The utility model provides a short-circuit protection circuit based on hall current sensor and voltage comparator has following beneficial effect:
1. an MOS control signal is latched and turned off by detecting an overcurrent threshold through a series Hall current sensor, and the MOS transistor is rapidly turned off when the MOS transistor is in overcurrent, so that the MOS transistor is protected, and equipment faults caused by circuit burning are avoided;
2. and an overcurrent threshold comparator and a latch are arranged, so that the circuit is fast in response and strong in anti-interference capability.
Drawings
Fig. 1 is a schematic diagram of an embodiment of the short-circuit protection circuit based on the hall current sensor and the voltage comparator.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Referring to fig. 1, in one embodiment of the present invention, a short circuit protection circuit based on a hall current sensor and a voltage comparator. The method comprises the following steps: the output ends of the high-speed Hall current sensor U1 and U1 are electrically connected with the input end of an overcurrent threshold comparator U2, U2 is electrically connected with the input end of a latch U3, a latch U3 is connected with a power supply reset circuit, the output end of a latch U3 is electrically connected with the input end of a signal switch circuit, the output end of the signal switch circuit is electrically connected with the input end of a power switch circuit, and the output end of the power switch circuit is connected with a load; the Hall current sensor U1 outputs analog level to the positive phase input end of the overcurrent threshold comparator U2, the power switch circuit comprises a power switch PMOS tube Q1, a direct current power supply is connected in series to the S pole of the power switch PMOS tube Q1 through two acquisition ports (namely Hall elements in figure 1) of the Hall current sensor to provide a direct current power supply through high-end drive output, the D pole of the Q1 is a load output end, a resistor R2 and a resistor R3 are connected between the S pole and the G pole to divide voltage, the D pole is connected with the D pole of a signal switch NMOS tube Q2, and the S pole is connected with the negative electrode of the power supply.
In an embodiment of the present invention, the output terminal of the latch U3 is connected to the cathode of the fault low-level turn-off diode D1, and the MOS switch driving signal is inputted to the anode of the fault low-level turn-off diode D1 through the voltage dividing resistor R5. The anode of the fault low-level turn-off diode D1 is connected with the reference voltage divider resistor R1. Meanwhile, the anode of the fault low-level turn-off diode D1 is connected with a pull-down resistor R4. The signal switch circuit comprises a signal switch PMOS tube Q1, and the signal switch PMOS tube is connected with voltage dividing resistors R2 and R3.
The resistor R1, the fault low-level turn-off diode D1 and the NMOS transistor Q2 form a MOS transistor fault turn-off circuit. The Hall current sensor U1 outputs analog level to the over-current threshold comparator U2, when the load current exceeds the preset threshold, the over-current threshold comparator U2 outputs high level to the latch U3, before the power supply is powered up again, the output of the latch U3 keeps low level all the time, the grid of the signal switch NMOS tube Q2 is pulled down by the latch U3 connected with the D1 to be closed and cut off instantly, the load switch PMOS tube Q1 also realizes rapid cut-off when the signal switch NMOS tube Q2 is cut off rapidly, the short-circuit over-current fault protection effect is achieved, and the device fault caused by circuit burning is avoided.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A short-circuit protection circuit based on a Hall current sensor and a voltage comparator is characterized in that the output end of the Hall current sensor is electrically connected with the input end of an overcurrent threshold comparator, the overcurrent threshold comparator is electrically connected with the input end of a latch, the latch is connected with a power supply reset circuit, the output end of the latch is electrically connected with the input end of a signal switch circuit, the output end of the signal switch circuit is electrically connected with the input end of a power switch circuit, and the output end of the power switch circuit is connected with a load; the Hall current sensor outputs an analog level to be sent to a positive phase input end of the overcurrent threshold comparator, the power switch circuit comprises a power switch PMOS tube, and a direct current power supply is connected in series to an S electrode of the power switch PMOS tube through two acquisition ports of the Hall current sensor and is used for driving output to a high end to provide the direct current power supply.
2. The short-circuit protection circuit based on the Hall current sensor and the voltage comparator as claimed in claim 1, wherein the output terminal of the latch is connected to a negative electrode of a fault low-level turn-off diode, and the MOS switch driving signal is inputted to a positive electrode of the fault low-level turn-off diode through a voltage dividing resistor.
3. The hall current sensor and voltage comparator based short circuit protection circuit of claim 2 wherein the fault low level turn off diode anode is connected to a reference voltage divider resistor.
4. The hall current sensor and voltage comparator based short circuit protection circuit of claim 2 wherein the fault low level turn off diode anode is connected to a pull down resistor.
5. The short-circuit protection circuit based on the Hall current sensor and the voltage comparator as claimed in claim 1 or 2, wherein the signal switch circuit comprises a signal switch PMOS tube, and the signal switch PMOS tube is connected with a voltage dividing resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022849446.5U CN213661197U (en) | 2020-12-01 | 2020-12-01 | Short-circuit protection circuit based on Hall current sensor and voltage comparator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022849446.5U CN213661197U (en) | 2020-12-01 | 2020-12-01 | Short-circuit protection circuit based on Hall current sensor and voltage comparator |
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| CN213661197U true CN213661197U (en) | 2021-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022849446.5U Active CN213661197U (en) | 2020-12-01 | 2020-12-01 | Short-circuit protection circuit based on Hall current sensor and voltage comparator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113489105A (en) * | 2021-07-14 | 2021-10-08 | 钰泰半导体南通有限公司 | Single-inductor double-output switch charging circuit and control method thereof |
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2020
- 2020-12-01 CN CN202022849446.5U patent/CN213661197U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113489105A (en) * | 2021-07-14 | 2021-10-08 | 钰泰半导体南通有限公司 | Single-inductor double-output switch charging circuit and control method thereof |
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