CN220775376U - Overvoltage protection circuit for collecting analog quantity - Google Patents
Overvoltage protection circuit for collecting analog quantity Download PDFInfo
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- CN220775376U CN220775376U CN202322519337.0U CN202322519337U CN220775376U CN 220775376 U CN220775376 U CN 220775376U CN 202322519337 U CN202322519337 U CN 202322519337U CN 220775376 U CN220775376 U CN 220775376U
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- 239000003990 capacitor Substances 0.000 claims description 38
- 238000001514 detection method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
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Abstract
The utility model discloses an overvoltage protection circuit for collecting analog quantity, which comprises an overvoltage protection circuit for collecting voltage and an overvoltage protection circuit for collecting current; when the current signal is collected, an overvoltage threshold value can be set to be any voltage value of 2-36V, and the overvoltage threshold value exceeds the threshold value, so that the current collection circuit performs power-off protection to stop working; for voltage signal acquisition, different application scenes can be applied by calculating the resistance value.
Description
Technical Field
The utility model belongs to the field of analog signals, and particularly relates to a multi-parameter sensor detection circuit technology based on electrochemistry.
Background
The controller in the engineering machinery mostly needs to collect analog signals and circuits for analog signals, besides the precision requirement, more importantly, the overvoltage protection is needed, because the engineering machinery vehicle is mostly outdoors and is easily affected by severe environment, the connector port is interfered, and the analog acquisition circuits are burnt out by high voltage. In order to prevent the product from failing to work normally, an overvoltage protection circuit is required to be designed.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, in order to achieve the above-mentioned objects, the present utility model provides, in one aspect, the following technical solutions:
the overvoltage protection circuit is characterized by comprising a voltage acquisition overvoltage protection circuit and a current acquisition overvoltage protection circuit, wherein the voltage acquisition overvoltage protection circuit and the current acquisition overvoltage protection circuit are arranged in parallel, and an analog signal is input into the current acquisition overvoltage protection circuit.
Preferably, the overvoltage protection circuit for voltage acquisition comprises a capacitor C1, a resistor R2, a micro control unit MCU and a conducting device D1.
More preferably, the micro control unit MCU is respectively connected with the conduction device D1 and the capacitor C1; the output end of the conduction device D1 is respectively connected with 3V3, and the input end of the conduction device D is grounded and connected with the capacitor C1; the capacitor C1 is connected with the resistor R1 in parallel, and the resistor R1 is connected with the resistor R2.
Preferably, the overvoltage protection circuit for current collection includes a diode D2, a capacitor C2, a resistor R3, a resistor R4, a transistor Q1, a resistor R5, a resistor R6, an aic_ctr terminal, an amplifier U1, a capacitor C3, a resistor R7, and a resistor R8.
More preferably, one end of the diode D2 is connected with the analog signal and the capacitor C2, and the other end of the diode D2 is grounded; one end of the capacitor C2 is connected with the diode D2 and the resistor R3 respectively, and the other end of the capacitor C is grounded; the resistor R3 is connected with the resistor R4 and the triode Q1 respectively, the resistor R4 and the triode Q1 are arranged in parallel, and the emitter of the triode Q1 is grounded and the base of the triode Q1 is connected with the resistor R5 and the output end of the amplifier U1 respectively.
Preferably, the resistor R5 is connected to the resistor R6 and the aic_ctr terminal, respectively.
More preferably, one input end of the amplifier U1 is connected with the capacitor C3, and the other end of the capacitor C3 is grounded; the capacitor C3 is also connected with the resistor R8 in parallel, and the other end of the resistor R8 is grounded; resistor R8 is also connected to resistor R7.
Preferably, the resistor R7 is connected to the diode D2.
Based on the defects existing in the prior art, the utility model provides the overvoltage protection circuit for collecting the analog quantity, wherein an overvoltage threshold value can be freely set when a current signal is collected, and the overvoltage threshold value exceeds the threshold value, so that the current collection circuit stops working when the current signal is subjected to power-off protection, and different application scenes can be applied by calculating the resistance value when the voltage signal is collected.
Drawings
Fig. 1 is a circuit diagram of the utility model for collecting analog quantities for overvoltage protection.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. 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.
Furthermore, references to "first," "second," etc. in this disclosure are for descriptive purposes only and are not to be construed as indicating or implying a relative importance or the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the technical solutions should be considered that the combination does not exist and is not within the scope of protection claimed by the present utility model.
It should be noted that, in the practical application of the present utility model, the application is inevitably applied to software programs, but the applicant states that the software programs applied in the implementation of the technical solution are all the prior art, and in the present application, modification and protection of the software programs are not involved, but protection of a hardware architecture designed for achieving the purpose of the present utility model.
The utility model provides an overvoltage protection circuit for collecting analog quantity, referring to fig. 1, fig. 1 is a schematic circuit connection diagram of the overvoltage protection circuit for collecting analog quantity, wherein the content of a dotted line box is the overvoltage protection circuit for collecting voltage, and the rest is the overvoltage protection circuit for collecting current.
The overvoltage protection circuit for collecting analog quantity comprises a voltage collection overvoltage protection circuit and a current collection overvoltage protection circuit, wherein the voltage collection overvoltage protection circuit and the current collection overvoltage protection circuit are connected in parallel, and analog signal input is connected into the current collection overvoltage protection circuit.
Preferably, the overvoltage protection circuit for voltage acquisition comprises a capacitor C1, a resistor R2, a micro control unit MCU and a conducting device D1.
More preferably, the micro control unit MCU is respectively connected with the conduction device D1 and the capacitor C1; the output end of the conduction device D1 is respectively connected with 3V3, and the input end of the conduction device D is grounded and connected with the capacitor C1; the capacitor C1 is connected with the resistor R1 in parallel, and the resistor R1 is connected with the resistor R2.
The conducting device D1 is formed by connecting two diodes in series, wherein the anode of one diode is grounded, the cathode of the other diode is connected with the anode of the other diode, the connecting point is connected with C1 and MCU, and the cathode of the other diode is connected with 3.3V.
The overvoltage protection during voltage acquisition is realized by the resistor R1, the resistor R2 and the conducting device D1, the voltage of the input end is compared with the Vr and Pd of the D1 through the resistor R1 and the voltage value (V2) divided by the resistor R2, the MCU can be protected when the V2 is smaller than the Vr, the voltage value cannot be higher than 3.6V, a proper diode is required to be selected according to practical application, and the power of the voltage dividing resistors R1 and R2 is also key to selection.
Preferably, the overvoltage protection circuit for current collection includes a diode D2, a capacitor C2, a resistor R3, a resistor R4, a transistor Q1, a resistor R5, a resistor R6, an aic_ctr terminal, an amplifier U1, a capacitor C3, a resistor R7, and a resistor R8.
More preferably, one end of the diode D2 is connected with the analog signal and the capacitor C2, and the other end of the diode D2 is grounded; one end of the capacitor C2 is connected with the diode D2 and the resistor R3 respectively, and the other end of the capacitor C is grounded; the resistor R3 is connected with the resistor R4 and the triode Q1 respectively, the resistor R4 and the triode Q1 are arranged in parallel, and the emitter of the triode Q1 is grounded and the base of the triode Q1 is connected with the resistor R5 and the output end of the amplifier U1 respectively.
Wherein the diode D2 is connected in parallel with the capacitor C2, one end of the capacitor C2 and one end of the diode D2 are both grounded, and the other end is an analog signal input end
Preferably, the resistor R5 is connected to the resistor R6 and the aic_ctr terminal, respectively.
More preferably, one input end of the amplifier U1 is connected with the capacitor C3, and the other end of the capacitor C3 is grounded; the capacitor C3 is also connected with the resistor R8 in parallel, and the other end of the resistor R8 is grounded; resistor R8 is also connected to resistor R7.
The analog signal input is divided by the resistor R7 and the resistor R8 to the input of the amplifier U1.
Preferably, the resistor R7 is connected to the diode D2.
The overvoltage protection during current collection is protected through a resistor R7, a resistor R8 and an amplifier U1, the voltage of an input end is compared with VREF through the resistor R7, the voltage value (V1) divided by the resistor R8 is compared with VREF, when V1 is smaller than VREF, the amplifier U1 outputs high level, the triode Q1 is conducted at the moment, the current collection function is normal, when V1 is larger than VREF, the amplifier U1 outputs low level, the triode Q1 is not conducted at the moment, the current collection function is protected due to the fact that the voltage of the input end is too high, and the current collection function cannot be achieved. The voltage value of VREF determines the V1 threshold value, and then determines the voltage threshold value of the input end, VREF can be defined by an engineer, has higher flexibility, is suitable for various application scenes, and the amplifier U1 can support overvoltage protection of 4-path current collection and has powerful functions.
The circuit realizes the functions of: collecting voltage of 0-5V; and 4-20mA current collection.
When AIC_CTR is low, transistor Q1 is non-conductive, and is a voltage acquisition circuit. R1 and R2 are divider resistors, D1 is a diode, and after high voltage input, voltage division is performed first, and then the MCU of the later stage is protected by utilizing the volt-ampere characteristic of the diode.
When AIC_CTR is high, Q1 is on, which is the current collection circuit. Q1 is conducted to enable R4 to be short-circuited, R3 is grounded, and voltage obtained by 249 omega and collected current can be calculated according to ohm's law and then divided into voltage for MCU collection.
The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model without requiring creative effort by one of ordinary skill in the art. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by a person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (8)
1. The overvoltage protection circuit is characterized by comprising a voltage acquisition overvoltage protection circuit and a current acquisition overvoltage protection circuit, wherein the voltage acquisition overvoltage protection circuit and the current acquisition overvoltage protection circuit are arranged in parallel, and an analog signal is input into the current acquisition overvoltage protection circuit.
2. The overvoltage protection circuit for collecting analog quantity according to claim 1, wherein the overvoltage protection circuit for collecting voltage comprises a capacitor C1, a resistor R2, a micro control unit MCU and a conducting device D1.
3. The overvoltage protection circuit for collecting analog quantity according to claim 2, wherein the micro control unit MCU is connected with the conducting device D1 and the capacitor C1 respectively; the output end of the conduction device D1 is respectively connected with 3V3, and the input end of the conduction device D is grounded and connected with the capacitor C1; the capacitor C1 is connected with the resistor R1 in parallel, and the resistor R1 is connected with the resistor R2.
4. The overvoltage protection circuit for collecting analog quantity according to claim 1, wherein the overvoltage protection circuit for collecting current comprises a diode D2, a capacitor C2, a resistor R3, a resistor R4, a triode Q1, a resistor R5, a resistor R6, an aic_ctr terminal, an amplifier U1, a capacitor C3, a resistor R7 and a resistor R8.
5. The overvoltage protection circuit for collecting analog quantity according to claim 4, wherein one end of the diode D2 is connected with the analog signal and the capacitor C2, and the other end is grounded; one end of the capacitor C2 is connected with the diode D2 and the resistor R3 respectively, and the other end of the capacitor C is grounded; the resistor R3 is connected with the resistor R4 and the triode Q1 respectively, the resistor R4 and the triode Q1 are arranged in parallel, and the emitter of the triode Q1 is grounded and the base of the triode Q1 is connected with the resistor R5 and the output end of the amplifier U1 respectively.
6. The circuit of claim 4, wherein the resistor R5 is connected to the resistor R6 and aic_ctr terminals, respectively.
7. The circuit for collecting over-voltage protection according to claim 4, wherein one input terminal of the amplifier U1 is connected to a capacitor C3, and the other terminal of the capacitor C3 is grounded; the capacitor C3 is also connected with the resistor R8 in parallel, and the other end of the resistor R8 is grounded; resistor R8 is also connected to resistor R7.
8. An analog quantity detection overvoltage protection circuit according to claim 4, wherein said resistor R7 is connected to a diode D2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322519337.0U CN220775376U (en) | 2023-09-15 | 2023-09-15 | Overvoltage protection circuit for collecting analog quantity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322519337.0U CN220775376U (en) | 2023-09-15 | 2023-09-15 | Overvoltage protection circuit for collecting analog quantity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220775376U true CN220775376U (en) | 2024-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322519337.0U Active CN220775376U (en) | 2023-09-15 | 2023-09-15 | Overvoltage protection circuit for collecting analog quantity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220775376U (en) |
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2023
- 2023-09-15 CN CN202322519337.0U patent/CN220775376U/en active Active
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