CN217063337U - Undervoltage protection circuit with dynamically adjustable protection value - Google Patents
Undervoltage protection circuit with dynamically adjustable protection value Download PDFInfo
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- CN217063337U CN217063337U CN202220307914.2U CN202220307914U CN217063337U CN 217063337 U CN217063337 U CN 217063337U CN 202220307914 U CN202220307914 U CN 202220307914U CN 217063337 U CN217063337 U CN 217063337U
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Abstract
The utility model discloses an undervoltage protection circuit with dynamically adjustable protection value, relating to the circuit field; the circuit comprises a power supply, a switch detection circuit, a power supply detection circuit and a processing module; the POWER supply comprises an input POWER supply POWER _ I N for supplying POWER to the switch control circuit and the voltage detection circuit; the processing module comprises an operation processor U1, the model of the operation processor U1 is STM32F103RCT6, and the operation processor U1 comprises an OFF pin and an ADC _ I N13 pin. The utility model has the advantages that: through switch control and voltage detection, the low-voltage protection value requirements of different customers can be met.
Description
Technical Field
The utility model relates to a circuit field, specific theory involves an undervoltage protection circuit of adjustable guard value of developments.
Background
At present, for products to be powered by batteries, such as various vehicle-mounted Beidou positioning terminals, an undervoltage protection function for power supply needs to be provided for preventing the batteries from being damaged due to over-discharge. The undervoltage protection circuit has various design modes, but the protection voltage value is basically determined by hardware when the hardware is designed. With the increase of product customers, different customers may be equipped with different batteries, and different protection levels are required, i.e., different under-voltage protection values of products are required. Adjusting hardware to meet the requirements of each customer results in numerous hardware versions and complex management and control.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides an undervoltage protection circuit of dynamic adjustable protection value, this circuit can carry out on-off control and voltage detection, realizes the dynamic configuration to the low pressure protection under the condition that does not increase the hardware cost.
The utility model provides a technical scheme that its technical problem adopted is: an undervoltage protection circuit with a dynamically adjustable protection value specifically comprises a power supply, a processing module, a switch control circuit and a voltage detection circuit.
IN the above structure, the POWER supply includes an input POWER supply POWER _ IN for supplying POWER to the switch control circuit and the voltage detection circuit.
IN the above configuration, the processing module includes an arithmetic processor U1, and the arithmetic processor U1 includes an OFF pin and an ADC _ IN13 pin.
In the above structure, the switch control circuit includes a switch transistor Q1, a MOS transistor Q2, a triode Q3, a three-terminal regulator U2 and a zener diode D1; the S pole of the switching tube Q1 is connected with an input POWER supply POWER _ IN, the D pole is connected with a system POWER supply VSYS, and the G pole is connected with the input POWER supply POWER _ IN and the S pole of the MOS tube Q2; a G pole of the MOS tube Q2 is connected with a grounding end, and a D pole is connected with an input POWER supply POWER _ IN and the grounding end; the A pole of the three-terminal voltage-stabilizing tube U2 is connected with a grounding end, the K pole is connected with the G pole of the switch tube Q1, and the R pole is connected with an input POWER supply POWER _ IN; the collector of the triode Q3 is connected with the G pole of the MOS tube Q2, the base is connected with the OFF pin of the arithmetic processor U1, and the emitter is grounded.
In the above structure, the undervoltage protection circuit with dynamically adjustable protection value further comprises a voltage detection circuit; the voltage detection circuit comprises resistors R11 and R12, a capacitor C3 and a diode D2; the anode of the diode D2 is connected with the pin of ADC _ IN13 of the arithmetic processor U1, the anode is grounded through a capacitor C3, and the cathode is connected with the end of the VMCU; the resistor R11 and the resistor R12 are connected IN series between the input POWER supply POWER _ IN and the ground terminal, and the pin of the ADC _ IN13 of the arithmetic processor U1 is connected between the resistor R11 and the resistor R12.
In the above structure, the resistor R1 is disposed between the base of the transistor Q3 and the OFF pin of the processor U1, and the resistor R2 is disposed between the base of the transistor Q3 and the ground terminal; the capacitor C1 is arranged between the G pole of the MOS transistor Q2 and the grounding end, and the resistor R3 is connected in parallel to two ends of the capacitor C1; the resistor R4 is arranged between the G pole of the MOS tube Q2 and a system power supply VSYS, the resistor R5 is arranged between the G pole of the switch tube Q1 and the S pole of the MOS tube Q2, and the resistor R6 is arranged between the G pole of the switch tube Q1 and the K pole of the three-terminal regulator tube U2; the resistor R7 and the capacitor C2 are arranged between the G pole of the switching tube Q1 and the input POWER supply POWER _ IN, and the resistor R8, the resistor R9 and the resistor R10 are sequentially arranged between the D pole of the MOS tube Q2 and the input POWER supply POWER _ IN IN series; the R pole of the three-terminal voltage regulator tube U2 is connected with an input POWER supply POWER _ IN through a resistor R9 and a resistor R10; the zener diode D1 is disposed between the R pole of the three-terminal regulator tube U2 and ground.
In the above structure, the model of the arithmetic processor U1 is STM32F103RCT 6.
In the structure, the model of the three-terminal voltage stabilizing tube U2 is RS 431A.
In the structure, the model of the switching tube Q1 is LM7P 20.
In the structure, the model of the MOS transistor Q2 is 2N 7002.
In the structure, the model of the transistor Q3 is BC 846B.
In the structure, the model of the zener diode D1 is BZT52C3V 0.
In the structure, the model of the diode D2 is 1N 4148.
The utility model has the advantages that: through switch control and voltage detection, the low-voltage protection value requirements of different customers can be met.
Drawings
Fig. 1 is the structure schematic diagram of the undervoltage protection circuit of the dynamic adjustable protection value of the present invention.
Fig. 2 is the utility model relates to a switching control circuit schematic diagram in the undervoltage protection circuit of the adjustable guard value of developments.
Fig. 3 is the utility model relates to a voltage detection circuit schematic diagram in undervoltage protection circuit of dynamic adjustable guard value.
Fig. 4 is a structural diagram of an operation processor U1 in the undervoltage protection circuit with dynamically adjustable protection value according to the present invention.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention. In addition, all the connection/connection relations referred to in the patent do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliary components according to specific implementation conditions. The utility model discloses each technical feature in the creation can the interactive combination under the prerequisite that does not contradict conflict each other.
Referring to fig. 1 to 4, the present invention discloses an under-voltage protection circuit with dynamically adjustable protection value, specifically, the circuit includes a power supply 10, a processing module 20, a switch control circuit 30 and a voltage detection circuit 40.
The POWER supply 10 includes an input POWER supply POWER IN for powering the switch control circuit 30 and the voltage detection circuit 40.
The processing module 20 comprises an arithmetic processor U1, the model of the arithmetic processor U1 is STM32F103RCT6, and the arithmetic processor U1 comprises an OFF pin and an ADC _ IN13 pin.
The switch control circuit 30 comprises a switch tube Q1, a MOS tube Q2, a triode Q3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a capacitor C1, a capacitor C2, a three-terminal voltage-regulator tube U2 and a voltage-regulator diode D1;
the model of the switching tube Q1 is LM7P20, which is provided with G, S and a D pole, the model of the MOS tube Q2 is 2N7002, which is provided with G, S and the D pole, the model of the three-terminal voltage-stabilizing tube U2 is RS431A, which is provided with a positive pole, a negative pole and a reference end, the model of the voltage-stabilizing diode D1 is BZT52C3V0, and the model of the triode Q3 is BC 846B.
An S pole of the switching tube Q1 is connected with an input POWER supply POWER _ IN, a D pole is connected with a system POWER supply VSYS, and a G pole is connected with the input POWER supply POWER _ IN and an S pole of the MOS tube Q2; the G pole of the MOS tube Q2 is connected with the grounding end, and the D pole is connected with the input POWER supply _ IN and the grounding end; the A pole of the three-terminal voltage-stabilizing tube U2 is connected with a grounding end, the K pole is connected with the G pole of the switch tube Q1, and the R pole is connected with an input POWER supply POWER _ IN; the collector of the triode Q3 is connected with the G pole of the MOS tube Q2, the base is connected with the OFF pin of the arithmetic processor U1, and the emitter is grounded.
The resistor R1 is arranged between the base of the transistor Q3 and the OFF pin of the arithmetic processor U1, and the resistor R2 is arranged between the base of the transistor Q3 and the ground terminal; the capacitor C1 is arranged between the G pole of the MOS transistor Q2 and the grounding end, and the resistor R3 is connected in parallel to two ends of the capacitor C1; the resistor R4 is arranged between the G pole of the MOS tube Q2 and a system power supply VSYS, the resistor R5 is arranged between the G pole of the switch tube Q1 and the S pole of the MOS tube Q2, and the resistor R6 is arranged between the G pole of the switch tube Q1 and the K pole of the three-terminal regulator tube U2; the resistor R7 and the capacitor C2 are arranged between the G pole of the switching tube Q1 and the input POWER supply POWER _ IN, and the resistor R8, the resistor R9 and the resistor R10 are sequentially arranged between the D pole of the MOS tube Q2 and the input POWER supply POWER _ IN IN series; the R pole of the three-terminal voltage regulator tube U2 is connected with an input POWER supply POWER _ IN through a resistor R9 and a resistor R10; the zener diode D1 is disposed between the R pole of the three-terminal regulator tube U2 and ground.
The voltage detection circuit 40 comprises resistors R11 and R12, a capacitor C3 and a diode D2; the model of the diode D2 is 1N4148, the anode of the diode D2 is connected with the pin of the ADC _ IN13 of the operation processor U1, the anode is grounded through a capacitor C3, and the cathode is connected with the end of the VMCU; the resistor R11 and the resistor R12 are connected IN series between the input POWER supply _ IN and the ground terminal, and the pin of the ADC _ IN13 of the operation processor U1 is connected between the resistor R11 and the resistor R12.
According to the scheme, a voltage detection circuit 30 and an operation processor U1 are designed to detect the power supply voltage, the operation processor U1 can control the voltage detection circuit 30 to be used for powering on the starting equipment, and when the input voltage reaches a threshold value, the equipment is started; the operation processor U1 can also control the switch control circuit 30, when the processing detects that the supply voltage is too low through the AD port, and the device needs to be shut down to protect the battery, the processor releases the locked state with the IO output signal, and cuts off the power supply to realize the undervoltage protection.
The operation processor U1 is used for obtaining voltage data from the voltage detection circuit 30, comparing the voltage data with a protection voltage value set by a user, and outputting a signal to cut off the power supply when the power supply voltage is lower than the protection voltage value.
The switch control circuit 30 is used to implement power-on and power-off functions during power-on, power supply self-locking and protection.
The voltage detection circuit 40 is used for detecting the power supply voltage, and is implemented by a voltage dividing resistor in cooperation with an AD converter. The divider resistor reduces the power supply voltage to a voltage value suitable for an AD port in proportion, and the AD converter realizes analog-to-digital conversion and data acquisition. The switch tube Q1 is a channel of the main circuit, and the switch tube Q1 is in a closed state under normal conditions; when the reference end voltage of the three-terminal voltage-stabilizing tube U2 is lower than 2.5V, the anode and the cathode of the three-terminal voltage-stabilizing tube U2 are not conducted, and when the reference end voltage is higher than 2.5V, the anode and the cathode of the three-terminal voltage-stabilizing tube U2 are conducted.
When the voltage of the three-terminal voltage-stabilizing tube U2 is higher than 2.5V, the G pole of the switch tube Q1 is pulled down through the resistor R6 after the anode and the cathode are conducted, so that voltage difference is directly formed between the S poles of the G poles of the switch tube Q1, the switch tube Q1 is conducted, the power supply is output to the system power supply VSYS, and power-on starting is achieved.
After the system power supply VSYS is electrified, the capacitor C1 is charged through the resistor R4, the G pole voltage of the capacitor C1 and the MOS tube Q2 can be quickly increased to be higher than the starting voltage of 1.8V, the MOS tube Q2 is conducted, the G pole of the switch tube Q1 is pulled down through the resistor R5 after the MOS tube Q2 is conducted, the voltage difference between the G, S poles of the switch tube Q1 is maintained, the conduction state of the switch tube Q1 is also maintained, and therefore self-locking of the conduction state is achieved.
When the processor detects that the input voltage is too low, the processor sends a high level to the triode Q3 through the GPIO and the R1, the triode Q3 is conducted, the capacitor C1 is discharged, the MOS tube Q2 is closed, the circuit is cut off, the input voltage is inevitably lower than the starting voltage (the set protection voltage is necessarily lower than the starting voltage), the three-terminal voltage regulator tube U2 is also closed, the switch tube Q1 is closed under the action of the pull-up resistor R7, the power supply is cut off, and low-voltage protection is achieved.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (10)
1. An undervoltage protection circuit with a dynamically adjustable protection value is characterized by comprising a processing module, a switch control circuit, an input POWER supply POWER _ IN and a system POWER supply VSYS;
the processing module comprises an arithmetic processor U1, the arithmetic processor U1 comprises an OFF pin and an ADC _ IN13 pin;
the switch control circuit comprises a switch tube Q1, a MOS tube Q2, a triode Q3, a three-terminal voltage regulator tube U2 and a voltage regulator diode D1; the S pole of the switching tube Q1 is connected with an input POWER supply POWER _ IN, the D pole is connected with a system POWER supply VSYS, and the G pole is connected with the input POWER supply POWER _ IN and the S pole of the MOS tube Q2; the G pole of the MOS tube Q2 is connected with the grounding end, and the D pole is connected with the input POWER supply _ IN and the grounding end; the A pole of the three-terminal voltage-stabilizing tube U2 is connected with a grounding end, the K pole is connected with the G pole of the switch tube Q1, and the R pole is connected with an input POWER supply POWER _ IN; the collector of the triode Q3 is connected with the G pole of the MOS transistor Q2, the base is connected with the OFF pin of the arithmetic processor U1, and the emitter is grounded.
2. The undervoltage protection circuit with dynamically adjustable protection value as claimed in claim 1, wherein the undervoltage protection circuit with dynamically adjustable protection value further comprises a voltage detection circuit;
the voltage detection circuit comprises resistors R11 and R12, a capacitor C3 and a diode D2; the anode of the diode D2 is connected with an ADC _ IN13 pin of the arithmetic processor U1, the anode is grounded through a capacitor C3, and the cathode is connected with the end of the VMCU; the resistor R11 and the resistor R12 are connected IN series between the input POWER supply POWER _ IN and the ground terminal, and the pin of the ADC _ IN13 of the arithmetic processor U1 is connected between the resistor R11 and the resistor R12.
3. The undervoltage protection circuit with the dynamically adjustable protection value according to claim 1, wherein the switch control circuit further comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a capacitor C1, and a capacitor C2;
the resistor R1 is arranged between the base of the triode Q3 and the OFF pin of the arithmetic processor U1, and the resistor R2 is arranged between the base of the triode Q3 and the ground terminal; the capacitor C1 is arranged between the G pole of the MOS transistor Q2 and the grounding end, and the resistor R3 is connected in parallel to two ends of the capacitor C1; the resistor R4 is arranged between the G pole of the MOS tube Q2 and a system power supply VSYS, the resistor R5 is arranged between the G pole of the switch tube Q1 and the S pole of the MOS tube Q2, and the resistor R6 is arranged between the G pole of the switch tube Q1 and the K pole of the three-terminal regulator tube U2; the resistor R7 and the capacitor C2 are arranged between the G pole of the switching tube Q1 and the input POWER supply POWER _ IN, and the resistor R8, the resistor R9 and the resistor R10 are sequentially arranged between the D pole of the MOS tube Q2 and the input POWER supply POWER _ IN IN series; the R pole of the three-terminal voltage regulator tube U2 is connected with an input POWER supply POWER _ IN through a resistor R9 and a resistor R10; the zener diode D1 is disposed between the R pole of the three-terminal regulator tube U2 and ground.
4. The undervoltage protection circuit with the dynamically adjustable protection value as claimed in claim 1, wherein the model of the arithmetic processor U1 is STM32F103RCT 6.
5. The undervoltage protection circuit with dynamically adjustable protection value as claimed in claim 1, wherein said three-terminal regulator U2 is RS 431A.
6. The undervoltage protection circuit with the dynamically adjustable protection value as claimed in claim 1, wherein the type of the switching tube Q1 is T0252.
7. The undervoltage protection circuit with the dynamically adjustable protection value as claimed in claim 1, wherein the MOS transistor Q2 is 2N 7002.
8. The undervoltage protection circuit with dynamically adjustable protection value as claimed in claim 1, wherein the transistor Q3 is of type BC 846B.
9. The undervoltage protection circuit with the dynamically adjustable protection value as claimed in claim 1, wherein the zener diode D1 is model BZT52C3V 0.
10. The undervoltage protection circuit with dynamically adjustable protection value as claimed in claim 2, wherein said diode D2 is 1N4148 type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220307914.2U CN217063337U (en) | 2022-02-15 | 2022-02-15 | Undervoltage protection circuit with dynamically adjustable protection value |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220307914.2U CN217063337U (en) | 2022-02-15 | 2022-02-15 | Undervoltage protection circuit with dynamically adjustable protection value |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217063337U true CN217063337U (en) | 2022-07-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220307914.2U Active CN217063337U (en) | 2022-02-15 | 2022-02-15 | Undervoltage protection circuit with dynamically adjustable protection value |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217063337U (en) |
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2022
- 2022-02-15 CN CN202220307914.2U patent/CN217063337U/en active Active
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