CN219833752U - Voltage protection anti-interference circuit - Google Patents
Voltage protection anti-interference circuit Download PDFInfo
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- CN219833752U CN219833752U CN202321018901.4U CN202321018901U CN219833752U CN 219833752 U CN219833752 U CN 219833752U CN 202321018901 U CN202321018901 U CN 202321018901U CN 219833752 U CN219833752 U CN 219833752U
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Abstract
The embodiment of the utility model discloses an anti-interference circuit for voltage protection, which comprises: the device comprises a switch assembly, a control unit, a comparison unit and an anti-interference unit; one end of the switch component is connected with a power supply; the other end of the switch component is connected with the product; the switch component is used for being conducted or cut off under the control of the control unit so that the power supply supplies power to the product or stops supplying power; the comparison unit is used for comparing the voltage output by the power supply to the product with a set voltage protection value so as to output an electric signal whether voltage protection is adopted or not; the anti-interference unit is used for eliminating coupling interference on the electric signal to form an output signal, and transmitting the output signal to the control unit so that the control unit controls the on or off of the switch assembly. By implementing the circuit provided by the embodiment of the utility model, the anti-interference performance of the voltage protection acquisition electric signal can be improved, the risk of false triggering or incapability of triggering high-low voltage protection in time is reduced, and the accuracy of the high-low voltage protection is improved.
Description
Technical Field
The utility model relates to the technical field of anti-interference circuits, in particular to an anti-interference circuit with voltage protection.
Background
The high-low voltage protection of most projects is to detect the working voltage supplied to the circuit board through an acquisition circuit of the MCU, the acquisition result is compared on a hardware comparator or on an MCU software algorithm, after the acquisition result exceeds the set result range, a return signal is transmitted to the MCU, and the MCU can disconnect a loop for supplying power to the circuit board through a control switch, so that the high-low voltage protection is triggered. But on some circuit boards with larger space, the wiring of the acquisition circuit electrical signal which is transmitted back to the MCU is longer, and other interference can be coupled in the process, so that larger burr noise is caused to the electrical signal, and the acquired electrical signal recognized by the MCU is greatly deviated from the actual situation, so that the risk of false triggering or incapability of triggering high-low voltage protection in time can be possibly caused.
Therefore, a new circuit is necessary to be designed, so that the anti-interference performance of the collected electric signal of the voltage protection is improved, the risk of false triggering or incapability of triggering high-low voltage protection in time is reduced, and the accuracy of the high-low voltage protection is improved.
Disclosure of Invention
The utility model aims to provide an anti-interference circuit with voltage protection.
In order to solve the technical problems, the aim of the utility model is realized by the following technical scheme: provided is a voltage-protected anti-interference circuit, including: the device comprises a switch assembly, a control unit, a comparison unit and an anti-interference unit; one end of the switch component is connected with a power supply; the other end of the switch component is connected with a product; the switch component is used for being conducted or cut off under the control of the control unit so that the power supply supplies power to the product or stops supplying power; the comparison unit is used for comparing the voltage output by the power supply to the product with a set voltage protection value so as to output an electric signal whether voltage protection is adopted or not; the anti-interference unit is used for eliminating coupling interference on the electric signal to form an output signal, and transmitting the output signal to the control unit so that the control unit controls the on or off of the switch assembly.
The further technical scheme is as follows: the switch component comprises an MOS tube Q3 and an MOS tube Q2, and the MOS tube Q3 is respectively connected with the MOS tube Q2 and the power supply; the MOS tube Q2 is connected with the product; and the MOS tube Q3 and the MOS tube Q2 are respectively connected with the control unit.
The further technical scheme is as follows: the comparison unit comprises a first comparator U1 and a second comparator U3, wherein the inverting input end of the first comparator U1 and the inverting input end of the second comparator U3 are respectively connected between the MOS tube Q2 and the product.
The further technical scheme is as follows: the output end of the first comparator U1 and the output end of the second comparator U3 are respectively connected with the anti-interference unit.
The further technical scheme is as follows: the non-inverting input end of the first comparator U1 is connected with a resistor R4, and a resistor R6 with one end grounded is connected between the resistor R4 and the non-inverting input end of the first comparator U1.
The further technical scheme is as follows: the non-inverting input end of the second comparator U3 is connected with a resistor R24, and a resistor R26 with one end grounded is connected between the resistor R24 and the non-inverting input end of the second comparator U3.
The further technical scheme is as follows: the anti-interference unit comprises a first anti-interference subunit and a second anti-interference subunit, and the first anti-interference subunit is connected with the output end of the first comparator U1; the second anti-interference subunit is connected with the output end of the second comparator U3; the output end of the first anti-interference subunit and the output end of the second anti-interference subunit are respectively connected with the control unit.
The further technical scheme is as follows: the first anti-interference subunit comprises a comparator U4, and the non-inverting input end of the comparator U4 is connected with the output end of the first comparator U1.
The further technical scheme is as follows: the second anti-interference subunit comprises a comparator U3, and the non-inverting input end of the comparator U3 is connected with the output end of the second comparator U3.
The further technical scheme is as follows: the inverting input end of the comparator U4 is connected with a resistor R17 with one end grounded.
Compared with the prior art, the utility model has the beneficial effects that: the utility model compares the voltage output by the power supply to the product with the set voltage protection value by the comparison unit to output whether the voltage protection electric signal is adopted, wherein the voltage protection can be high voltage or low voltage, the anti-interference unit eliminates coupling interference to the electric signal to form an output signal, and the output signal is transmitted to the control unit, so that the control unit controls the switch assembly to be conducted or cut off, the anti-interference performance of the voltage protection acquisition electric signal is improved, the risk of false triggering or incapability of timely triggering high-low voltage protection is reduced, and the accuracy of the high-low voltage protection is improved.
The utility model is further described below with reference to the drawings and specific embodiments.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of a voltage-protected anti-tamper circuit according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a voltage-protected anti-interference circuit according to an embodiment of the present utility model;
the figure identifies the description:
10. a switch assembly; 20. a control unit; 30. a comparison unit; 40. an anti-interference unit; 50. a power supply; 60. and (5) a product.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Referring to fig. 1, fig. 1 is a schematic block diagram of an anti-interference circuit with voltage protection according to an embodiment of the present utility model, where the circuit can be applied to a product 60 with high and low voltage protection, and can be applied to SSD test boards, eMMC test boards, UFS test boards, and other test board products, so as to improve the anti-interference performance of voltage protection for collecting electric signals, reduce the risk of false triggering or failing to trigger high and low voltage protection in time, and improve the accuracy of high and low voltage protection.
Referring to fig. 1, the anti-interference circuit for voltage protection includes: a switch assembly 10, a control unit 20, a comparison unit 30, and an anti-interference unit 40; one end of the switch assembly 10 is connected with a power supply 50; the other end of the switch assembly 10 is connected with the product 60; a switch assembly 10 for being turned on or off under the control of the control unit 20 so that the power source 50 supplies or stops supplying power to the product 60; a comparison unit 30 for comparing the voltage output from the power supply 50 to the product 60 with a set voltage protection value to output an electrical signal whether voltage protection is adopted; the anti-interference unit 40 is configured to cancel coupling interference of the electrical signal to form an output signal, and transmit the output signal to the control unit 20, so that the control unit 20 controls the on or off of the switch assembly 10.
In this embodiment, the switching assembly 10 may control the interrupt signal when it is detected by the control unit 20, and open or close the path of the power supply 50 to the product 60; the comparing unit 30 compares the voltage supplied to the product 60 with the set high-low voltage protection value to determine whether to use high-low protection to form an electrical signal; the anti-interference unit 40 eliminates coupling interference to the electrical signal and forms a feedback signal, which is transmitted to the control unit 20, so that the control unit 20 controls the on or off of the switch assembly 10 according to the feedback signal.
In the present embodiment, the chip model of the control unit 20 is, but not limited to, HDSC-HC32F4A0.
In an embodiment, referring to fig. 2, the switch assembly 10 includes a MOS transistor Q3 and a MOS transistor Q2, and the MOS transistor Q3 is connected to the MOS transistor Q2 and the power supply 50 respectively; MOS tube Q2 is connected with product 60; the MOS transistor Q3 and the MOS transistor Q2 are connected to the control unit 20, respectively.
When the circuit board is powered on, the control unit 20 will pull the mcu_trigger to a high level by default, the MOS transistor Q3 is turned on due to the actual voltage of Vgs being greater than the turn-on voltage, and then the MOS transistor Q2 is also turned on, and the Power supply 50power_in is supplied to the product 60 from the power_out terminal through the MOS transistor Q2.
In an embodiment, referring to fig. 2, the comparing unit 30 includes a first comparator U1 and a second comparator U3, wherein an inverting input terminal of the first comparator U1 and an inverting input terminal of the second comparator U3 are respectively connected between the MOS transistor Q2 and the product 60.
The principle of the comparator is that when the IN+ voltage is larger than the IN-voltage, the output is high level; otherwise, the output is low. The output signals of the first comparator U1 and the second comparator U3 are electrical signals that determine whether to use high/low voltage protection. The first comparator U1 forms a high-voltage protection circuit, and the second comparator U3 forms a low-voltage protection circuit.
In an embodiment, the output end of the first comparator U1 and the output end of the second comparator U3 are respectively connected to the anti-interference unit 40.
In an embodiment, referring to fig. 2, a resistor R4 is connected to the non-inverting input terminal of the first comparator U1, and a resistor R6 with a grounded end is connected between the resistor R4 and the non-inverting input terminal of the first comparator U1.
When the circuit works, the voltage is abnormally higher and higher than the set voltage division value of the high-voltage protection formed by the combination of R4 and R6, the first comparator U1 outputs an electric signal which is converted from low level to high level, the electric signal is used for determining whether to adopt high-voltage protection, and the electric signal is subjected to the anti-interference unit 40, so that the anti-interference unit 40 can determine whether to adopt the high-voltage protection and the corresponding reference ground to make a difference. Even if coupling interference comes at this time, the electrical signal determining whether to use high voltage protection and the corresponding reference ground will have the same interference source, when the two are bad, the same interference source will cancel out, and the remaining electrical signal will be transmitted back to the control unit 20 through mcu_int2.
In an embodiment, referring to fig. 2, a resistor R24 is connected to the non-inverting input terminal of the second comparator U3, and a resistor R26 with a grounded end is connected between the resistor R24 and the non-inverting input terminal of the second comparator U3.
In this embodiment, when the voltage of the circuit is abnormally low and is lower than the low-voltage protection set voltage division value formed by R24 and R26 during operation, the second comparator U3 will output an electrical signal converted from low level to high level, the electrical signal is an electrical signal for determining whether to use low-voltage protection, and then the electrical signal for determining whether to use low-voltage protection is subjected to a difference between the electrical signal for determining whether to use low-voltage protection and the corresponding reference ground through the anti-interference unit 40, even if coupling interference comes at this time, the electrical signal for determining whether to use low-voltage protection and the corresponding reference ground both have the same interference source, after the difference is made between the electrical signal and the reference ground, the same interference source will be cancelled, and the remaining electrical signal is transmitted back to the control unit 20 through the mcu_int1.
In an embodiment, referring to fig. 2, the anti-interference unit 40 includes a first anti-interference subunit and a second anti-interference subunit, where the first anti-interference subunit is connected to the output end of the first comparator U1; the second anti-interference subunit is connected with the output end of the second comparator U3; the output of the first anti-interference subunit and the output of the second anti-interference subunit are respectively connected with the control unit 20.
In an embodiment, referring to fig. 2, the first anti-interference subunit includes a comparator U4, and a non-inverting input terminal of the comparator U4 is connected to an output terminal of the first comparator U1.
In an embodiment, referring to fig. 2, the second anti-interference subunit includes a comparator U3, and a non-inverting input terminal of the comparator U3 is connected to an output terminal of the second comparator U3.
In an embodiment, referring to fig. 2, the inverting input terminal of the comparator U4 is connected to a resistor R17 with one end grounded.
When the remaining electrical signals are transmitted back to the control unit 20, the control unit 20 immediately triggers an interrupt mechanism, and the MOS transistor Q3 and the MOS transistor Q2 are closed by pulling the MCU_trigger to a low level, so that the power supply 50 is interrupted to continuously deliver the product 60, and high-low voltage protection is realized.
In an embodiment, referring to fig. 2, the inverting input terminal of the comparator U2 is connected to a resistor R13 with one end grounded.
The non-inverting input end of the comparator U2 is connected with the output end of the second comparator U3 through a triode Q4; the non-inverting input terminal of the comparator U4 is connected with the output terminal of the first comparator U1 through the triode Q1.
In the present embodiment, the MCU in fig. 2 refers to the control unit 20.
Specifically, when the circuit board is powered on, the control unit 20 will pull mcu_trigger high by default, Q3 is turned on because Vgs actual voltage is greater than the on voltage, and Q2 is also turned on, and the Power supply 50power_in is supplied to the product 60 from the power_out terminal through Q2. The principle of the comparator is as follows: when the IN+ voltage is larger than the IN-voltage, the output is high level; otherwise, the output is low. The output signals of the first comparator U1 and the second comparator U3 are electrical signals for determining whether to use high/low voltage protection. The first comparator U1 forms a high-voltage protection circuit, and the second comparator U3 forms a low-voltage protection circuit. When the circuit works, the voltage is abnormally higher and is higher than the high-voltage protection set voltage division value of the resistors R4 and R6, the first comparator U1 outputs an electric signal which is converted from low level to high level, the electric signal is an electric signal for determining whether to adopt high-voltage protection, and then the electric signal passes through the comparator U4, and the comparator U4 determines whether to adopt the high-voltage protection and the corresponding reference ground to make a difference. Even if coupling interference comes at this time, the electric signal for high-voltage protection and the corresponding reference ground are determined to have the same interference source, after the electric signal and the reference ground are bad, the same interference source is offset, the remaining electric signal is transmitted back to the control unit 20 through the MCU_INT2, the control unit 20 immediately triggers an interrupt mechanism, and the MOS transistor Q3 and the MOS transistor Q2 are closed by pulling the MCU_trigger to a low level, so that the power supply 50 is interrupted to continue to convey to the product 60, and high-voltage protection is realized; similarly, when the circuit is in operation, the voltage is abnormally low and is lower than the low-voltage protection set voltage division value of the resistors R24 and R26, the second comparator U3 will output an electrical signal from low level to high level, the electrical signal is an electrical signal for determining whether to use low-voltage protection, and then the electrical signal is passed through the comparator U2, and the comparator U2 will determine whether to use low-voltage protection to make a difference with the corresponding reference ground. Even if coupling interference comes at this time, the electric signal for determining whether to adopt low-voltage protection and the corresponding reference ground all have the same interference source, after the electric signal and the reference ground are bad, the same interference source is cancelled, the remaining electric signal is transmitted back to the control unit 20 through the MCU_INT1, the control unit 20 immediately triggers an interrupt mechanism, and the MOS tube Q3 and the MOS tube Q2 are closed by pulling the MCU_trigger to a low level, so that the power supply 50 is interrupted to continue to convey to the product 60, and the low-voltage protection is realized. The anti-interference performance of the output electric signal of the high-low voltage protection is enhanced, and the accuracy of the high-low voltage protection is improved.
In this embodiment, the anti-interference unit 40 should be close to the control unit 20 when the PCB is laid out, so as to weaken the coupling interference path of the output signal.
The high voltage range in this embodiment is determined by the resistance values of the resistor R4 and the resistor R6; the low voltage range is determined by the resistance of the resistor R24 and the resistor R26.
According to the anti-interference circuit for voltage protection, the switch assembly 10, the control unit 20, the comparison unit 30 and the anti-interference unit 40 are arranged, the comparison unit 30 is used for comparing the voltage output by the power supply 50 to the product 60 with the set voltage protection value so as to output whether an electric signal for voltage protection is adopted, the voltage protection can be high voltage or low voltage, the anti-interference unit 40 is used for eliminating coupling interference on the electric signal to form an output signal, and the output signal is transmitted to the control unit 20, so that the control unit 20 controls the switch assembly 10 to be conducted or cut off, the anti-interference performance of the voltage protection acquisition electric signal is improved, the risk of false triggering or incapability of timely triggering high-low voltage protection is reduced, and the accuracy of high-low voltage protection is improved. While the utility model has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.
Claims (10)
1. A voltage-protected anti-tamper circuit, comprising: the device comprises a switch assembly, a control unit, a comparison unit and an anti-interference unit; one end of the switch component is connected with a power supply; the other end of the switch component is connected with a product; the switch component is used for being conducted or cut off under the control of the control unit so that the power supply supplies power to the product or stops supplying power; the comparison unit is used for comparing the voltage output by the power supply to the product with a set voltage protection value so as to output an electric signal whether voltage protection is adopted or not; the anti-interference unit is used for eliminating coupling interference on the electric signal to form an output signal, and transmitting the output signal to the control unit so that the control unit controls the on or off of the switch assembly.
2. The anti-interference circuit of claim 1, wherein the switch assembly comprises a MOS transistor Q3 and a MOS transistor Q2, the MOS transistor Q3 being connected to the MOS transistor Q2 and the power supply, respectively; the MOS tube Q2 is connected with the product; and the MOS tube Q3 and the MOS tube Q2 are respectively connected with the control unit.
3. The voltage-protected anti-interference circuit according to claim 2, wherein the comparing unit comprises a first comparator U1 and a second comparator U3, and the inverting input terminal of the first comparator U1 and the inverting input terminal of the second comparator U3 are respectively connected between the MOS transistor Q2 and the product.
4. A voltage-protected anti-tamper circuit according to claim 3, wherein the output of the first comparator U1 and the output of the second comparator U3 are connected to the anti-tamper unit, respectively.
5. A voltage-protected anti-interference circuit according to claim 3, wherein the non-inverting input terminal of the first comparator U1 is connected to a resistor R4, and a resistor R6 with one end grounded is connected between the resistor R4 and the non-inverting input terminal of the first comparator U1.
6. A voltage-protected anti-interference circuit according to claim 3, wherein the non-inverting input terminal of the second comparator U3 is connected to a resistor R24, and a resistor R26 having a grounded end is connected between the resistor R24 and the non-inverting input terminal of the second comparator U3.
7. The voltage-protected anti-tamper circuit of claim 4, wherein said anti-tamper unit comprises a first anti-tamper subunit and a second anti-tamper subunit, said first anti-tamper subunit being connected to an output of said first comparator U1; the second anti-interference subunit is connected with the output end of the second comparator U3; the output end of the first anti-interference subunit and the output end of the second anti-interference subunit are respectively connected with the control unit.
8. The voltage-protected anti-tamper circuit of claim 7, wherein said first anti-tamper subunit comprises a comparator U4, said comparator U4 having a non-inverting input connected to an output of said first comparator U1.
9. The voltage-protected anti-tamper circuit of claim 7, wherein said second anti-tamper subunit comprises a comparator U3, said comparator U3 having a non-inverting input connected to an output of said second comparator U3.
10. The voltage-protected anti-interference circuit according to claim 8, wherein the inverting input terminal of the comparator U4 is connected to a resistor R17 having one end grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321018901.4U CN219833752U (en) | 2023-04-27 | 2023-04-27 | Voltage protection anti-interference circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321018901.4U CN219833752U (en) | 2023-04-27 | 2023-04-27 | Voltage protection anti-interference circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219833752U true CN219833752U (en) | 2023-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321018901.4U Active CN219833752U (en) | 2023-04-27 | 2023-04-27 | Voltage protection anti-interference circuit |
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| CN (1) | CN219833752U (en) |
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2023
- 2023-04-27 CN CN202321018901.4U patent/CN219833752U/en active Active
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