CN218549746U - Ceramic pressure sensor adjusting circuit - Google Patents
Ceramic pressure sensor adjusting circuit Download PDFInfo
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- CN218549746U CN218549746U CN202222773155.1U CN202222773155U CN218549746U CN 218549746 U CN218549746 U CN 218549746U CN 202222773155 U CN202222773155 U CN 202222773155U CN 218549746 U CN218549746 U CN 218549746U
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Abstract
The utility model discloses a pottery pressure sensor adjustment circuit, include: ceramic pressure sensor, power module and operational amplifier module, the module is put including handling chip U2, resistance R3, resistance R4, resistance R5, electric capacity C4, adjustable resistance RT1, adjustable resistance RT2 to fortune, the Vin-foot and the Vin + foot of handling chip U2 with ceramic pressure sensor connects and is used for receiving voltage signal SensorOut-and voltage signal SensorOut + respectively, the Vout foot of handling chip U2 loops through behind resistance R5 and the electric capacity R4 and is connected with signal ground, the V + foot and the REF foot of handling chip U2 pass through resistance R3 and connect, the REF foot and the V-foot of handling chip U2 pass through adjustable resistance RT2 and connect, the V-foot still is connected with signal ground, it has resistance R4 and adjustable resistance RT1 to handle between two G feet of chip U2 series connection. The utility model has the advantages of simple structure and low cost.
Description
Technical Field
The utility model relates to a sensor technical field, in particular to pottery pressure sensor adjusting circuit.
Background
At present, two types of ceramic sensor interface circuits are provided, one type is a special interface chip, the cost is high, the other type is an instrument amplifying circuit built by using a general operational amplifier, the circuit of the mode is complex, and the requirement on the installation space of the sensor is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a pottery pressure sensor regulating circuit, it has simple structure, and is with low costs, can accomplish the advantage to ceramic pressure sensor's automatic debugging.
The above technical object of the present invention can be achieved by the following technical solutions:
a ceramic pressure sensor adjustment circuit comprising: a ceramic pressure sensor, a power supply module and an operational amplifier module,
the ceramic pressure sensor outputs voltage signals SensorOut + and SensorOut-to the operational amplifier module, and a grounding end VS-of the ceramic pressure sensor is connected with a resistor RS1 and is connected with a signal ground through the resistor RS 1;
the operational amplifier module comprises a processing chip U2, a resistor R4, a resistor R5, a capacitor C4 and an adjustable resistor RT1, wherein a Vin-pin and a Vin + pin of the processing chip U2 are connected with the ceramic pressure sensor and are respectively used for receiving a voltage signal SensorOut-and a voltage signal SensorOut +, a Vout pin of the processing chip U2 is connected with a signal ground after sequentially passing through the resistor R5 and the capacitor R4, the V-pin is also connected with the signal ground, the resistor R4 and the adjustable resistor RT1 are connected in series between two G pins of the processing chip U2, the V + pin and the REF pin of the processing chip U2 and the REF pin and the V-pin are connected through resistors, and at least one of the resistors is an adjustable resistor;
the power supply module is used for connecting a power supply end VS + of the ceramic pressure sensor and a V + pin of the processing chip U2 and converting externally-accessed direct-current voltage into a fixed power supply VCC to supply power to the operational amplifier module and the ceramic pressure sensor.
Further setting: the processing chip U2 is specifically an SGM621 chip.
Further setting: the adjustable resistor RT1 and the adjustable resistor RT2 are laser adjustable resistors.
Further setting: the power supply module comprises a voltage stabilizing chip U1, an inductor L1, a resistor R2, a capacitor C1, a capacitor C2 and a capacitor C3, wherein an I pin of the voltage stabilizing chip U1 is connected with an external power supply through the inductor L1, the I pin is further connected with a signal ground through the capacitor C1, a G pin of the voltage stabilizing chip U1 is connected with the signal ground, an E pin of the voltage stabilizing chip U1 is connected with the I pin, the resistor R2 and the capacitor C2 are connected between an A pin of the voltage stabilizing chip U1 and the signal ground after being connected in parallel, an O pin of the voltage stabilizing chip U1 outputs a fixed power supply VCC, the O pin is further connected with the A pin through the resistor R1, and the O pin is connected with the signal ground through the capacitor C3.
To sum up, the utility model discloses following beneficial effect has: in the 5V power supply mode, the voltage between the output terminal of the ceramic sensor and the GND is about 2.5V, and the ceramic sensor is directly connected to the input terminal (Vin-or Vin +) of the operational amplifier of the instrument, which may cause that many operational amplifiers of the instrument cannot directly output rail-to-rail signals (caused by voltage drop inside the operational amplifier of the instrument). This patent is at resistance of ceramic sensor's GND termination for raise the voltage between the end of ceramic sensor output and GND, make the instrument fortune put can normally output the rail to the rail signal. The amplification factor of the instrument operational amplifier is adjusted by using two resistors between the amplification factor adjusting end, namely two G pins, of the instrument operational amplifier, namely the processing chip U2, wherein one resistor is a laser adjustable resistor. Two resistors are connected between the V + and the V-, and the middle node is connected with a reference voltage input end of the instrument operational amplifier, namely a REF pin; wherein the resistor connected with the V-is a laser adjustable resistor. The circuit can use the laser adjustable resistor RT1 to adjust the amplification factor of the instrument operational amplifier, and use the laser adjustable resistor RT2 to adjust the zero point of the sensor, thus completing automatic debugging.
Drawings
FIG. 1 is a schematic circuit diagram of a ceramic pressure sensor in an embodiment;
FIG. 2 is a circuit schematic diagram of an operational amplifier module in an embodiment;
fig. 3 is a circuit schematic of a power supply module in an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example (b):
as shown in fig. 1, 2 and 3, a ceramic pressure sensor adjustment circuit includes: a ceramic pressure sensor, a power supply module and an operational amplifier module,
the ceramic pressure sensor outputs voltage signals SensorOut + and SensorOut-to the operational amplifier module, and a grounding end VS-of the ceramic pressure sensor is connected with a resistor RS1 and is connected with a signal ground through the resistor RS 1;
the operational amplifier module comprises a processing chip U2, a resistor R4, a resistor R5, a capacitor C4 and an adjustable resistor RT1, wherein a Vin-pin and a Vin + pin of the processing chip U2 are connected with the ceramic pressure sensor and are respectively used for receiving a voltage signal SensorOut-and a voltage signal SensorOut +, a Vout pin of the processing chip U2 is connected with signal ground after sequentially passing through the resistor R5 and the capacitor R4, the V-pin is also connected with the signal ground, a resistor R4 and an adjustable resistor RT1 are connected in series between two G pins of the processing chip U2, a V + pin and a REF pin of the processing chip U2 and a REF pin and a V-pin are connected through resistors, any one of the two connected resistors can be an adjustable resistor or both can be an adjustable resistor, in the embodiment, a resistor R3 is arranged between the V + pin and the REF pin, and an adjustable resistor RT2 is arranged between the V-pin and the REF pin.
The power supply module is used for connecting a power supply end VS + of the ceramic pressure sensor and a V + pin of the processing chip U2 and converting externally-accessed direct-current voltage into a fixed power supply VCC to supply power to the operational amplifier module and the ceramic pressure sensor.
The processing chip U2 is specifically an SGM621 chip.
The adjustable resistor RT1 and the adjustable resistor RT2 are laser adjustable resistors.
The power supply module comprises a voltage stabilizing chip U1, an inductor L1, a resistor R2, a capacitor C1, a capacitor C2 and a capacitor C3, wherein an I pin of the voltage stabilizing chip U1 is connected with an external power supply through the inductor L1, the I pin is further connected with a signal ground through the capacitor C1, a G pin of the voltage stabilizing chip U1 is connected with the signal ground, an E pin of the voltage stabilizing chip U1 is connected with the I pin, the resistor R2 and the capacitor C2 are connected between an A pin of the voltage stabilizing chip U1 and the signal ground after being connected in parallel, an O pin of the voltage stabilizing chip U1 outputs a fixed power supply VCC, the O pin is further connected with the A pin through the resistor R1, and the O pin is connected with the signal ground through the capacitor C3.
In the 5V power supply mode, the voltage between the output end of the ceramic sensor and GND is about 2.5V, and the ceramic sensor is directly connected with the input end (Vin-or Vin +) of the instrument operational amplifier, so that many instrument operational amplifiers cannot directly output rail-to-rail signals (caused by internal voltage drop of the instrument operational amplifier). This patent is at resistance of ceramic sensor's GND termination for raise the voltage between the end of ceramic sensor output and GND, make the instrument fortune put can normally output the rail to the rail signal. The amplification factor of the instrument operational amplifier is adjusted by using two resistors between the amplification factor adjusting end, namely two G pins, of the instrument operational amplifier, namely the processing chip U2, wherein one resistor is a laser adjustable resistor. Two resistors are connected between the V + and the V-, and the middle node is connected with a reference voltage input end of the instrument operational amplifier, namely a REF pin; wherein the resistor connected with the V-is a laser adjustable resistor. The circuit can use the laser adjustable resistor RT1 to adjust the amplification factor of the instrument operational amplifier, and use the laser adjustable resistor RT2 to adjust the zero point of the sensor, thus completing the automatic debugging.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (4)
1. A ceramic pressure sensor adjustment circuit, comprising: a ceramic pressure sensor, a power supply module and an operational amplifier module,
the ceramic pressure sensor outputs voltage signals SensorOut + and SensorOut-to the operational amplifier module, and a grounding end VS-of the ceramic pressure sensor is connected with a resistor RS1 and is connected with a signal ground through the resistor RS 1;
the operational amplifier module comprises a processing chip U2, a resistor R4, a resistor R5, a capacitor C4 and an adjustable resistor RT1, wherein a Vin-pin and a Vin + pin of the processing chip U2 are connected with the ceramic pressure sensor and are respectively used for receiving a voltage signal SensorOut-and a voltage signal SensorOut +, a Vout pin of the processing chip U2 is connected with a signal ground after sequentially passing through the resistor R5 and the capacitor R4, the V-pin is also connected with the signal ground, the resistor R4 and the adjustable resistor RT1 are connected in series between two G pins of the processing chip U2, the V + pin and the REF pin of the processing chip U2 and the REF pin and the V-pin are connected through resistors, and at least one of the resistors is an adjustable resistor;
the power supply module is used for connecting a power supply end VS + of the ceramic pressure sensor and a V + pin of the processing chip U2 and converting externally-accessed direct-current voltage into a fixed power supply VCC to supply power to the operational amplifier module and the ceramic pressure sensor.
2. The ceramic pressure sensor adjusting circuit according to claim 1, wherein the processing chip U2 is particularly an SGM621 chip.
3. The ceramic pressure sensor adjustment circuit of claim 1, wherein the adjustable resistor RT1 and the adjustable resistor RT2 are laser trimmable resistors.
4. The ceramic pressure sensor adjusting circuit according to claim 1, wherein the power supply module includes a voltage stabilizing chip U1, an inductor L1, a resistor R2, a capacitor C1, a capacitor C2, and a capacitor C3, an I pin of the voltage stabilizing chip U1 is connected to an external power supply through the inductor L1, the I pin is further connected to a signal ground through the capacitor C1, a G pin of the voltage stabilizing chip U1 is connected to the signal ground, an E pin of the voltage stabilizing chip U1 is connected to the I pin, the resistor R2 and the capacitor C2 are connected in parallel and then connected between an a pin of the voltage stabilizing chip U1 and the signal ground, an O pin of the voltage stabilizing chip U1 outputs a fixed power supply VCC, the O pin is further connected to the a pin through the resistor R1, and the O pin is connected to the signal ground through the capacitor C3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222773155.1U CN218549746U (en) | 2022-10-20 | 2022-10-20 | Ceramic pressure sensor adjusting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222773155.1U CN218549746U (en) | 2022-10-20 | 2022-10-20 | Ceramic pressure sensor adjusting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218549746U true CN218549746U (en) | 2023-02-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222773155.1U Active CN218549746U (en) | 2022-10-20 | 2022-10-20 | Ceramic pressure sensor adjusting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218549746U (en) |
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2022
- 2022-10-20 CN CN202222773155.1U patent/CN218549746U/en active Active
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