CN220438448U - Differential high-voltage sampling circuit integrating voltage division, active filtering and protection - Google Patents
Differential high-voltage sampling circuit integrating voltage division, active filtering and protection Download PDFInfo
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- CN220438448U CN220438448U CN202322048599.3U CN202322048599U CN220438448U CN 220438448 U CN220438448 U CN 220438448U CN 202322048599 U CN202322048599 U CN 202322048599U CN 220438448 U CN220438448 U CN 220438448U
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- 238000005070 sampling Methods 0.000 title claims abstract description 44
- 238000001914 filtration Methods 0.000 title claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims description 22
- 238000005457 optimization Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of electronic circuits, in particular to a differential high-voltage sampling circuit integrating voltage division, active filtering and protection.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to a differential high-voltage sampling circuit integrating voltage division, active filtering and protection.
Background
Aiming at the rising of the current new energy industry and the rapid development of the inverter, the method is particularly important for controlling the voltage of each section of the inverter, in particular to measuring and controlling the voltages such as a medium-voltage direct-current bus, a high-voltage direct-current bus, an alternating-current side voltage and the like. At present, differential low-voltage sampling circuits are widely applied, but high-voltage sampling needs a special voltage sensor for sampling, and the differential low-voltage sampling circuits occupy large space and have high price. Meanwhile, the port of the singlechip chip is also easy to burn by high voltage or reverse voltage.
Disclosure of Invention
The utility model provides a differential high-voltage sampling circuit integrating voltage division, active filtering and protection, which simplifies the circuit and saves the cost.
In order to achieve the purpose of the utility model, the technical scheme adopted is as follows: the utility model provides a differential high voltage sampling circuit that collection partial pressure, active filtering and protection are integrative, includes low voltage differential sampling circuit, differential high voltage signal's bleeder circuit, active filter circuit and clamp protection circuit, low voltage differential sampling circuit is used for gathering voltage, differential high voltage signal's bleeder circuit is used for taking the partial pressure sample of high voltage signal into low voltage signal, active filter circuit is used for filtering high frequency interference, clamp protection circuit is used for avoiding the port of singlechip chip to be burnt by high voltage or reverse voltage.
As an optimization scheme of the utility model, the low-voltage differential sampling circuit comprises a resistor R1, a resistor R3, a resistor R7, a resistor R4, a resistor R8 and an operational amplifier U1, wherein the resistor R1 and the resistor R4 are connected in series between a 2 nd pin and a 1 st pin of the operational amplifier U1, one end of the resistor R8 and one end of the resistor R7 are both connected with a 3 rd pin of the operational amplifier U1, and one end of the resistor R3 is connected with the 2 nd pin of the operational amplifier U1.
As an optimization scheme of the utility model, the low-voltage differential sampling circuit comprises a bias voltage Vb, and the other end of the resistor R8 is connected with the bias voltage Vb.
As an optimization scheme of the utility model, the voltage dividing circuit of the differential high-voltage signal comprises a resistor R2, a resistor R3, a resistor R6 and a resistor R7, wherein the resistor R2 and the resistor R3 are connected in series between the D-port and the 2 nd pin of the operational amplifier U1, and the resistor R6 and the resistor R7 are connected in series between the D+ port and the 3 rd pin of the operational amplifier U1.
As an optimization scheme of the utility model, the active filter circuit comprises a resistor R1, a resistor R3, a resistor R7, a resistor R8, an operational amplifier U1, a capacitor C2, a capacitor C3 and a capacitor C4, wherein the capacitor C1 is connected in parallel with two ends of the resistor R1, the capacitor C4 is connected in parallel with two ends of the resistor R8, the capacitor C2 is connected between the 2 nd pin of the operational amplifier U1 and the ground, and the capacitor C3 is connected between the 3 rd pin of the operational amplifier U1 and the ground.
As an optimization scheme of the utility model, the clamping protection circuit comprises a diode D1 and a diode D2, wherein the anode of the diode D1 is connected with one end of a resistor R4, and the cathode of the diode D2 is connected with one end of the resistor R4.
The utility model has the positive effects that: 1) The utility model integrates the voltage dividing circuit, the low-voltage differential sampling circuit, the active filter circuit and the port protection circuit of the singlechip chip into a whole, simplifies the complex connection between the circuits, adopts simple devices to realize the functions, thereby saving the space of a PCB, reducing the number of components, further saving the cost and reducing the debugging time.
2) Compared with the prior low-voltage differential sampling circuit, the utility model has the advantages that the active filtering and protecting functions are added, and the interference signals above the set frequency can be separated, so that the sampling signals are purer. The added protection function can protect the singlechip chip port at the rear end under the condition that an operational amplifier or a differential branch does not work or is damaged, so that larger loss is prevented. The positive and negative ends of the operational amplifier are made to be part of a high voltage dividing circuit by utilizing the characteristic of the positive and negative ends of the operational amplifier, so that the high voltage dividing circuit can be reduced in proportion.
3) The utility model is realized mainly by integrating the high-voltage dividing circuit, the differential sampling circuit and the filter circuit, reduces the number of components, saves the PCB space and reduces the debugging time.
Drawings
For a clearer description of the technical solutions of embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and should not be considered limiting in scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
fig. 1 is a schematic circuit diagram of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
As shown in FIG. 1, the differential high-voltage sampling circuit integrating voltage division, active filtering and protection comprises a low-voltage differential sampling circuit, a differential high-voltage signal voltage division circuit, an active filtering circuit and a clamping protection circuit, wherein the low-voltage differential sampling circuit is used for collecting voltage, the differential high-voltage signal voltage division circuit is used for dividing and sampling the high-voltage signal into a low-voltage signal, the active filtering circuit is used for filtering high-frequency interference, and the clamping protection circuit is used for preventing the port of a singlechip chip from being burnt by high voltage or reverse voltage. Wherein: the low-voltage differential sampling circuit is used for collecting the required analog electric signals (gain is within the voltage range of the IO port or voltage following is carried out), and the voltage dividing circuit of the differential high-voltage signals is used for carrying out voltage dividing processing on the electric power high-voltage signals so as to divide and sample the high-voltage signals into low-voltage signals.
The low-voltage differential sampling circuit comprises a resistor R1, a resistor R3, a resistor R7, a resistor R4, a resistor R8 and an operational amplifier U1, wherein the resistor R1 and the resistor R4 are connected in series between a 2 nd pin and a 1 st pin of the operational amplifier U1, one end of the resistor R8 and one end of the resistor R7 are both connected with a 3 rd pin of the operational amplifier U1, and one end of the resistor R3 is connected with the 2 nd pin of the operational amplifier U1. The other end of the resistor R7 is connected with the resistor R6, and the other end of the resistor R3 is connected with the resistor R2.
The low-voltage differential sampling circuit comprises a bias voltage Vb, and the other end of the resistor R8 is connected with the bias voltage Vb.
The voltage dividing circuit of the differential high voltage signal comprises a resistor R2, a resistor R3, a resistor R6 and a resistor R7, wherein the resistor R2 and the resistor R3 are connected in series between the D-and the 2 nd pin of the operational amplifier U1, and the resistor R6 and the resistor R7 are connected in series between the D+ and the 3 rd pin of the operational amplifier U1.
The active filter circuit comprises a resistor R1, a resistor R3, a resistor R7, a resistor R8, an operational amplifier U1, a capacitor C2, a capacitor C3 and a capacitor C4, wherein the capacitor C1 is connected in parallel with two ends of the resistor R1, the capacitor C4 is connected in parallel with two ends of the resistor R8, the capacitor C2 is connected between the 2 nd pin of the operational amplifier U1 and the ground, and the capacitor C3 is connected between the 3 rd pin of the operational amplifier U1 and the ground.
The clamp protection circuit comprises a diode D1 and a diode D2, wherein the anode of the diode D1 is connected with one end of a resistor R4, and the cathode of the diode D2 is connected with one end of the resistor R4.
When the differential sampling circuit is implemented, a low-voltage differential sampling circuit is taken as a main body, two resistors with large resistance are added to the input, corresponding capacitors and sampling circuits are added to the circuit to form an active filter circuit, and two diodes are added to the output part to clamp the output signal voltage.
The circuit gain of the low-voltage differential sampling circuit is determined by a resistor R1, a resistor R3, a resistor R7 and a resistor R8. On the basis, a bias voltage Vb is added to solve the problem that the positive and negative differential signals are smaller than 0V through the gain output signal Uo, and the voltage value obtained by the ADC is Uo+vb.
The resistor R2, the resistor R3, the resistor R6 and the resistor R7 are combined with the virtual short-circuit and virtual break characteristics of the operational amplifier U1 to form a voltage divider circuit of a differential high-voltage signal, the resistor R2 and the resistor R6 are resistors with large resistance values, and voltages at two ends of the resistor R3 and the resistor R7 are input parts of the integral low-voltage differential sampling circuit.
The active filter circuit can obtain corresponding low-pass cut-off frequency by properly adjusting capacitance parameters, and ensures the filtering of high-frequency interference signals.
The clamping protection circuit selects a diode with smaller forward voltage drop, and when the output sampling signal is larger than the diode conducting voltage +VCC, the signal is clamped at the voltage value of the diode conducting voltage +VCC; when the output sampling signal is smaller than 0V-diode conducting voltage, the signal voltage is clamped at the voltage value of the diode conducting voltage (when the output sampling signal voltage is smaller than 0V, the diode is conducted to the output sampling signal voltage through GND, and the clamping voltage is the conducting voltage of the diode. The port voltage range of the common singlechip chip is-0.3V-VCC+0.3V, and the clamping protection circuit can protect the port from being burnt by high voltage or reverse voltage.
The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.
Claims (6)
1. The utility model provides a collect differential high voltage sampling circuit of partial pressure, active filtering and protection an organic whole which characterized in that: the differential sampling circuit is used for collecting voltage, the differential high-voltage signal voltage dividing circuit is used for dividing and sampling the high-voltage signal into low-voltage signals, the active filter circuit is used for filtering high-frequency interference, and the clamp protection circuit is used for preventing the port of the singlechip chip from being burnt by high voltage or reverse voltage.
2. The differential high voltage sampling circuit integrating voltage division, active filtering and protection as claimed in claim 1, wherein: the low-voltage differential sampling circuit comprises a resistor R1, a resistor R3, a resistor R7, a resistor R4, a resistor R8 and an operational amplifier U1, wherein the resistor R1 and the resistor R4 are connected in series between a 2 nd pin and a 1 st pin of the operational amplifier U1, one end of the resistor R8 and one end of the resistor R7 are both connected with a 3 rd pin of the operational amplifier U1, and one end of the resistor R3 is connected with the 2 nd pin of the operational amplifier U1.
3. The differential high voltage sampling circuit integrating voltage division, active filtering and protection as claimed in claim 2, wherein: the low-voltage differential sampling circuit comprises a bias voltage Vb, and the other end of the resistor R8 is connected with the bias voltage Vb.
4. The differential high voltage sampling circuit integrating voltage division, active filtering and protection as claimed in claim 2, wherein: the voltage dividing circuit of the differential high voltage signal comprises a resistor R2, a resistor R3, a resistor R6 and a resistor R7, wherein the resistor R2 and the resistor R3 are connected in series between the D-port and the 2 nd pin of the operational amplifier U1, and the resistor R6 and the resistor R7 are connected in series between the D+ port and the 3 rd pin of the operational amplifier U1.
5. The differential high voltage sampling circuit integrating voltage division, active filtering and protection as claimed in claim 4, wherein: the active filter circuit comprises a resistor R1, a resistor R3, a resistor R7, a resistor R8, an operational amplifier U1, a capacitor C2, a capacitor C3 and a capacitor C4, wherein the capacitor C1 is connected in parallel with two ends of the resistor R1, the capacitor C4 is connected in parallel with two ends of the resistor R8, the capacitor C2 is connected between the 2 nd pin of the operational amplifier U1 and the ground, and the capacitor C3 is connected between the 3 rd pin of the operational amplifier U1 and the ground.
6. The differential high voltage sampling circuit integrating voltage division, active filtering and protection as claimed in claim 5, wherein: the clamp protection circuit comprises a diode D1 and a diode D2, wherein the anode of the diode D1 is connected with one end of a resistor R4, and the cathode of the diode D2 is connected with one end of the resistor R4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322048599.3U CN220438448U (en) | 2023-08-01 | 2023-08-01 | Differential high-voltage sampling circuit integrating voltage division, active filtering and protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322048599.3U CN220438448U (en) | 2023-08-01 | 2023-08-01 | Differential high-voltage sampling circuit integrating voltage division, active filtering and protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220438448U true CN220438448U (en) | 2024-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322048599.3U Active CN220438448U (en) | 2023-08-01 | 2023-08-01 | Differential high-voltage sampling circuit integrating voltage division, active filtering and protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220438448U (en) |
-
2023
- 2023-08-01 CN CN202322048599.3U patent/CN220438448U/en active Active
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