CN214315241U - Current signal conversion circuit of force sensor - Google Patents
Current signal conversion circuit of force sensor Download PDFInfo
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- CN214315241U CN214315241U CN202120539299.3U CN202120539299U CN214315241U CN 214315241 U CN214315241 U CN 214315241U CN 202120539299 U CN202120539299 U CN 202120539299U CN 214315241 U CN214315241 U CN 214315241U
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Abstract
The current signal conversion circuit of the force sensor comprises a signal input circuit connected with a signal line interface J2/CON4 of the force sensor, an A/D conversion chip connected with the signal vehicle input circuit, a power supply circuit for supplying power to the A/D conversion chip, a power supply circuit connected with the A/D conversion chip for supplying power to the force sensor and a voltage stabilizing circuit for stabilizing the voltage of the A/D conversion chip, wherein a current signal is transmitted to the A/D conversion chip from the signal input circuit and is converted into a mathematical signal by the A/D conversion chip and then output to an upper computer unit, the signal input circuit is a differential signal input circuit, the A/D conversion chip is a dual-channel conversion chip with two differential input channels, and the signal input circuit is connected with one differential input channel in the A/D conversion chip, and the other path of the differential input channel of the A/D conversion chip is grounded. The utility model discloses realize steady voltage, high-efficient and the signal conversion of high accuracy, circuit structure is reliable and stable, and the practicality is strong.
Description
Technical Field
The utility model relates to a force sensor's current signal conversion circuit belongs to sensor signal acquisition technical field.
Background
Force is usually detected directly by a force sensor, which can be classified into a direct output type and an indirect output type according to the output type; the sensor generates elastic deformation under the action of external force by means of the bearing force of the elastic body, and then the magnitude of the combined force is converted and calculated by utilizing various force measurement detection circuits. In order to increase the versatility and universality of the force sensor, a force sensing element is usually placed at the front end, and the magnitude of the force is converted into the change of the current to be directly output, which is called as a direct output type. Aiming at a high-precision force sensor, particularly under the action of multidimensional external force, a sensitive element at the front end of the sensor can sense external acting force and convert the force into the change of current in a physical elastic deformation mode, but the change of the current is a weak analog signal, an upper computer end cannot recognize and correctly read, a circuit capable of converting a high-precision current signal into a digital signal needs to be designed, the circuit needs to efficiently and accurately convert the current signal into the digital signal, and the high-precision force sensor has good stability, high reliability and certain application value.
SUMMERY OF THE UTILITY MODEL
The utility model provides a force sensor's current signal conversion circuit realizes steady voltage, high-efficient and high accuracy signal conversion, improves force sensor's signal acquisition flexibility ratio and precision, and power supply circuit, supply circuit and voltage stabilizing circuit's combination realizes effectively resisting the interference to AD conversion chip and force sensor's power supply and circuit steady voltage, and circuit structure is reliable and stable, and the practicality is strong.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
the current signal conversion circuit of force sensor connects between force sensor and host computer unit, its characterized in that: comprises a signal input circuit connected with a signal line interface J2/CON4 of the force sensor, an A/D conversion chip connected with the signal vehicle input circuit, a power supply circuit for supplying power for the A/D conversion chip, a power supply circuit connected with the A/D conversion chip for supplying power for the force sensor and a voltage stabilizing circuit for stabilizing the voltage of the A/D conversion chip, wherein the current signal of the force sensor is transmitted to the A/D conversion chip by the signal input circuit, converted into a mathematical signal by the A/D conversion chip and then output to an upper computer unit, the signal input circuit is a differential signal input circuit, the A/D conversion chip is a dual-channel conversion chip with two differential input channels, the signal conversion input circuit is connected with one differential input channel of the A/D conversion chip, and the other differential input channel of the A/D conversion chip is grounded.
Preferably, the a/D conversion chip includes an INNA/INPA differential signal input channel and an INNB/INPB differential signal input channel, the signal input circuit is connected to the signal line interface J2/CON4 and the INNA/INPA differential signal input channel, the INNB/INPB differential signal input channel is grounded, the signal input circuit includes a first input line connected to the signal line interface J2/CON4 and the INNA differential signal input channel, a second input line connected to the signal line interface J2/CON4 and the INPA differential signal input channel, and a capacitor C43 connected in parallel to the first input line and the second input line, the first input line is connected in series to a 1K resistor R60, and the second input line is connected in series to a 1K resistor R61.
Preferably, the power circuit comprises a power supply +5V2 and an electrolytic cell C37, one end of the power supply +5V2 is connected to the DVDD pin of the a/D conversion chip, and the other end is connected to the VSUP pin of the a/D conversion chip and is connected in series with the electrolytic cell C37, and then is grounded.
Preferably, the power supply circuit comprises a triode Q4/8550 and a capacitor C39, wherein the triode Q4/8550 is connected with the power supply circuit at one end and is connected with the BASE pin at one end, the AVDD pin of the A/D conversion chip and the signal line interface J2/CON4 at the other end are connected with the signal line interface J2/CON4 for supplying power to the force sensor, and the capacitor C39 is connected with the signal line interface J2/CON4 in series and is grounded.
Preferably, the voltage stabilizing circuit comprises a resistor R55 connected in series with the AVDD pin and a resistor R57 connected in series with the resistor R55, the resistor R55 is connected with the VFB pin of the A/D conversion chip, and the resistor R57 is connected with the AGND pin of the A/D conversion chip and is grounded.
Preferably, the voltage stabilizing circuit further comprises a capacitor C41 connected in series with a pin of the reference power output terminal VGB of the a/D conversion chip, one end of the capacitor C41 is connected to the pin of the reference power output terminal VGB, and the other end is grounded.
Preferably, the a/D conversion chip has a signal output port DOUT connected to the upper computer unit, an output data RATE control port RATE for controlling an output data RATE, a clock signal output port PD-SCK connected to the upper computer unit, a reserved expansion input port XO, and a ground terminal X1, where the output data RATE control port RATE is connected to a power supply +5V2 in the power supply circuit.
Preferably, the a/D conversion chip is an HX711 chip.
The utility model has the advantages that:
the current signal conversion circuit of the force sensor of the utility model is connected between the force sensor and the upper computer unit, which converts the current signal of the force sensor into digital signal and inputs the digital signal into the upper computer unit, wherein, the force sensor and the A/D conversion chip are connected by the signal input circuit, the signal input circuit is a differential signal input circuit, the current signal of the force sensor is amplified by the differential signal input circuit and eliminates the dry and excellent signal therein and transmits the signal to the A/D conversion chip, the A/D conversion chip converts the received current signal into digital signal and transmits the digital signal to the upper computer unit, the A/D conversion chip is a dual-channel conversion chip with two differential input channels, which has good expansibility, can convert the current signal into 24-bit high-precision digital signal, the power circuit provides stable power for the whole circuit, the power supply circuit supplies power for the force sensor, and voltage stabilizing circuit plays the steady voltage effect to whole circuit, realizes steady voltage, high-efficient and high accuracy signal conversion, improves force sensor's signal acquisition flexibility ratio and precision, guarantees that the host computer can effectively and the accurate real-time inductive value that reads force sensor transmission. The combination of the power circuit, the power supply circuit and the voltage stabilizing circuit realizes the power supply and the circuit voltage stabilization of the A/D conversion chip and the force sensor, effectively resists interference, and has stable and reliable circuit structure and strong practicability.
Drawings
Fig. 1 is a block diagram of a current signal conversion circuit of the force sensor of the present invention.
Fig. 2 is a circuit diagram of a current signal conversion circuit of the force sensor.
Detailed Description
The following describes embodiments of the present invention in detail with reference to fig. 1 to 2.
The current signal conversion circuit of force sensor connects between force sensor and host computer unit, its characterized in that: comprises a signal input circuit connected with a signal line interface J2/CON4 of the force sensor, an A/D conversion chip connected with the signal vehicle input circuit, a power supply circuit for supplying power for the A/D conversion chip, a power supply circuit connected with the A/D conversion chip for supplying power for the force sensor and a voltage stabilizing circuit for stabilizing the voltage of the A/D conversion chip, wherein the current signal of the force sensor is transmitted to the A/D conversion chip by the signal input circuit, converted into a mathematical signal by the A/D conversion chip and then output to an upper computer unit, the signal input circuit is a differential signal input circuit, the A/D conversion chip is a dual-channel conversion chip with two differential input channels, the signal conversion input circuit is connected with one differential input channel of the A/D conversion chip, and the other differential input channel of the A/D conversion chip is grounded.
The current signal conversion circuit of the force sensor is connected between the force sensor and the upper computer unit to convert the current signal of the force sensor into a digital signal and input the digital signal into the upper computer unit, wherein the signal input circuit is connected with the force sensor and the A/D conversion chip, the signal input circuit is a differential signal input circuit, the current signal of the force sensor is amplified by the differential signal input circuit and the dry-type signal in the current signal is eliminated and is transmitted to the A/D conversion chip, the A/D conversion chip converts the received current signal into the digital signal and transmits the digital signal to the upper computer unit, the A/D conversion chip is a dual-channel conversion chip with two differential input channels, the A/D conversion chip has good expansibility and can convert the current signal into a 24-bit high-precision digital signal, and the power supply circuit provides a stable power supply for the whole circuit, the power supply circuit supplies power for the force sensor, and voltage stabilizing circuit plays the steady voltage effect to whole circuit, realizes steady voltage, high-efficient and high accuracy signal conversion, improves force sensor's signal acquisition flexibility ratio and precision, guarantees that the host computer can effectively and the accurate real-time inductive value that reads force sensor transmission. The combination of the power circuit, the power supply circuit and the voltage stabilizing circuit realizes the power supply and the circuit voltage stabilization of the A/D conversion chip and the force sensor, effectively resists interference, and has stable and reliable circuit structure and strong practicability.
The A/D conversion chip comprises an INNA/INPA differential signal input channel and an INNB/INPB differential signal input channel, a signal input circuit is connected with a signal line interface J2/CON4 and the INNA/INPA differential signal input channel, the INNB/INPB differential signal input channel is grounded, the signal input circuit comprises a first input line, a second input line and a capacitor C43, the first input line is connected with the signal line interface J2/CON4 and the INNA differential signal input channel, the second input line is connected with the signal line interface J2/CON4 and the INPA differential signal input channel, the first input line and the second input line are connected in parallel, a 1K resistor R60 is connected in series on the first input line, and a 1K resistor R61 is connected in series on the second input line. The INNA/INPA differential signal input channel and the INNB/INPB differential signal input channel in the A/D conversion chip can be respectively connected with a signal input circuit, the INNA/INPA differential signal input channel can be selected to be connected with the signal input circuit, the INNB/INPB differential signal input channel is grounded, or the INNB/INPB differential signal input channel is connected with the signal input circuit, and the INNA/INPA differential signal input channel is grounded. As shown in FIG. 2, the INNA/INPA differential signal input channel is selected to be connected with the signal input circuit, the INNB/INPB differential signal input channel is grounded, the signal input circuit comprises a first input line connected with the signal line interface J2/CON4 and the INNA differential signal input channel, a second input line connected with the signal line interface J2/CON4 and the INPA differential signal input channel, the signal source is stabilized by the resistors R60 and R61, filtering is performed by the capacitor C43, interference signals are eliminated, and the stability and the anti-interference performance of the signal input circuit are higher.
The power circuit comprises a power supply source +5V2 and an electrolytic cell C37, wherein one end of the power supply source +5V2 is connected with a DVDD pin of the A/D conversion chip, and the other end of the power supply source +5V2 is connected with a VSUP pin of the A/D conversion chip and is connected with the electrolytic cell C37 in series and then is grounded. The power supply +5V2 supplies power for the A/D conversion chip, and carries out power filtering and grounding through electrolytic cell C37, and the power supply stability is high.
The power supply circuit comprises a triode Q4/8550 and a capacitor C39, wherein the triode Q4/8550 is connected with a power supply circuit and a BASE pin of the A/D conversion chip, one end of the triode Q4/8550 is connected with the power supply circuit, one end of the triode Q4/8550 is connected with the BASE pin, the other end of the triode Q4/8550 is connected with an AVDD pin of the A/D conversion chip and a signal line interface J2/CON4 to supply power for the force sensor, and the capacitor C39 is connected to the signal line interface J2/CON4 in series and is grounded. The BASE pin is a power output control end, an output power supply is output to the AVDD pin after being stabilized by the triode Q4/8550, the AVDD pin is a power output end and is connected with the signal line interface J2/CON4 to supply power to the force sensor, and a stable power supply is provided for the force sensor.
The voltage stabilizing circuit comprises a resistor R55 connected with an AVDD pin in series and a resistor R57 connected with a resistor R55 in series, wherein the resistor R55 is connected with a VFB pin of the A/D conversion chip, and the resistor R57 is connected with an AGND pin of the A/D conversion chip and is grounded. The VFB pin is the input end of a voltage-stabilizing power supply, a power supply output by the AVDD pin is subjected to voltage stabilization through a resistor R55 and then is input into the VFB pin, and then is connected with the AGND pin through a resistor R57 and is grounded, so that the voltage-stabilizing safety of the voltage-stabilizing power supply is higher.
The voltage stabilizing circuit further comprises a capacitor C41 connected in series with a reference power supply output end VGB pin of the A/D conversion chip, one end of the capacitor C41 is connected with the reference power supply output end VGB pin, and the other end of the capacitor C41 is grounded. The VGB pin is the reference power supply output end, and ground connection behind the series connection electric capacity C41 forms reference voltage through the reference power supply output end, guarantees the voltage stability of AD conversion chip.
The A/D conversion chip is provided with a signal output port DOUT connected with the upper computer unit, an output data RATE control port RATE used for controlling the output data RATE, a clock signal output port PD-SCK connected with the upper computer unit, a reserved expansion input port XO and a grounding end X1, and the output data RATE control port RATE is connected with a power supply +5V2 in the power supply circuit. The clock signal output port PD-SCK is connected with a clock signal end of the upper computer unit; the signal output port DOUT and the signal input end of the upper computer unit are reserved with an expansion input port XO which is suspended to facilitate expansion, and an output data RATE control port RATE controls the signal output RATE of the A/D conversion chip.
Wherein, the A/D conversion chip is an HX711 chip. The HX711 chip is a high-precision 24-bit two-channel conversion chip, and is characterized in that two paths of differential inputs can be selected, the working voltage range is 2.6-5.5V, the working temperature range is-40- +85 ℃, all the control is input by pins, a register in the chip does not need to be reprogrammed, two output rates of 10HZ and 80HZ can be selected, the power supply interference of 50HZ and 60HZ is synchronously inhibited, and the chip is packaged by adopting a 16-pin SOP-16.
The technical solutions of the embodiments of the present invention are completely described above with reference to the accompanying drawings, and it should be noted that the described embodiments are only some embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Claims (8)
1. The current signal conversion circuit of force sensor connects between force sensor and host computer unit, its characterized in that: comprises a signal input circuit connected with a signal line interface J2/CON4 of the force sensor, an A/D conversion chip connected with the signal vehicle input circuit, a power supply circuit for supplying power for the A/D conversion chip, a power supply circuit connected with the A/D conversion chip for supplying power for the force sensor and a voltage stabilizing circuit for stabilizing the voltage of the A/D conversion chip, wherein the current signal of the force sensor is transmitted to the A/D conversion chip by the signal input circuit, converted into a mathematical signal by the A/D conversion chip and then output to an upper computer unit, the signal input circuit is a differential signal input circuit, the A/D conversion chip is a dual-channel conversion chip with two differential input channels, the signal conversion input circuit is connected with one differential input channel of the A/D conversion chip, and the other differential input channel of the A/D conversion chip is grounded.
2. The current signal conversion circuit of a force sensor according to claim 1, characterized in that: the A/D conversion chip comprises an INNA/INPA differential signal input channel and an INNB/INPB differential signal input channel, a signal input circuit is connected with a signal line interface J2/CON4 and the INNA/INPA differential signal input channel, the INNB/INPB differential signal input channel is grounded, the signal input circuit comprises a first input line, a second input line and a capacitor C43, the first input line is connected with the signal line interface J2/CON4 and the INNA differential signal input channel, the second input line is connected with the signal line interface J2/CON4 and the INPA differential signal input channel, the capacitor C43 is connected with the first input line and the second input line in parallel, a 1K resistor R60 is connected on the first input line in series, and a 1K resistor R61 is connected on the second input line in series.
3. The current signal conversion circuit of a force sensor according to claim 1, characterized in that: the power supply circuit comprises a power supply source +5V2 and an electrolytic solution C37, one end of the power supply source +5V2 is connected with a DVDD pin of the A/D conversion chip, and the other end of the power supply source +5V2 is connected with a VSUP pin of the A/D conversion chip and is connected with the electrolytic solution C37 in series and then is grounded.
4. The current signal conversion circuit of a force sensor according to claim 3, characterized in that: the power supply circuit comprises a triode Q4/8550 and a capacitor C39, wherein the triode Q4/8550 is connected with a power supply circuit and a BASE pin of the A/D conversion chip, one end of the triode Q4/8550 is connected with the power supply circuit, the other end of the triode Q4/8550 is connected with the BASE pin, the other end of the triode Q4/8550 is connected with an AVDD pin of the A/D conversion chip and a signal line interface J2/CON4 to supply power for the force sensor, and the capacitor C39 is connected to the signal line interface J2/CON4 in series and is grounded.
5. The current signal conversion circuit of a force sensor according to claim 4, wherein: the voltage stabilizing circuit comprises a resistor R55 connected with an AVDD pin in series and a resistor R57 connected with a resistor R55 in series, wherein the resistor R55 is connected with a VFB pin of the A/D conversion chip, and the resistor R57 is connected with an AGND pin of the A/D conversion chip and is grounded.
6. The current signal conversion circuit of a force sensor according to claim 5, wherein: the voltage stabilizing circuit further comprises a capacitor C41 connected in series with a reference power supply output end VGB pin of the A/D conversion chip, one end of the capacitor C41 is connected with the reference power supply output end VGB pin, and the other end of the capacitor C41 is grounded.
7. The current signal conversion circuit of a force sensor according to claim 3, characterized in that: the A/D conversion chip is provided with a signal output port DOUT connected with the upper computer unit, an output data RATE control port RATE used for controlling the output data RATE, a clock signal output port PD-SCK connected with the upper computer unit, a reserved expansion input port XO and a grounding end X1, and the output data RATE control port RATE is connected with a power supply +5V2 in the power supply circuit.
8. The current signal conversion circuit of a force sensor according to claim 7, wherein: the A/D conversion chip is an HX711 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120539299.3U CN214315241U (en) | 2021-03-16 | 2021-03-16 | Current signal conversion circuit of force sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120539299.3U CN214315241U (en) | 2021-03-16 | 2021-03-16 | Current signal conversion circuit of force sensor |
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| Publication Number | Publication Date |
|---|---|
| CN214315241U true CN214315241U (en) | 2021-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120539299.3U Active CN214315241U (en) | 2021-03-16 | 2021-03-16 | Current signal conversion circuit of force sensor |
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| CN (1) | CN214315241U (en) |
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2021
- 2021-03-16 CN CN202120539299.3U patent/CN214315241U/en active Active
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