CN210141868U - Circuit device and electronic equipment - Google Patents

Abstract

The utility model discloses a circuit arrangement and electronic equipment, this circuit arrangement includes signal processing circuit, analog front end circuit, resistance adjustment control circuit and at least one adjustable resistor, at least one adjustable resistor is used for forming the wheatstone bridge with at least one sensor resistance connection that is located the circuit arrangement outside, the input of analog front end circuit is connected to the output of wheatstone bridge, signal processing circuit's input is connected to the output of analog front end circuit, signal processing circuit's input is connected to the output, adjustable resistor's control end is connected to resistance adjustment control circuit's output. This technical scheme, on the one hand can reduce the manufacturing cost of sensor and reduce the area of sensor, and on the other hand can realize no matter the resistance quantity in the sensor is one or more, and this circuit arrangement homoenergetic effectively detects the output signal of sensor, compares application scope wider, the practicality is stronger with traditional sensing signal detection circuitry.

Description

Circuit device and electronic equipment

Technical Field

The utility model relates to a measurement field, in particular to circuit arrangement and electronic equipment.

Background

As is well known, a sensing device mainly includes a sensing signal detection circuit for signal processing and a sensor for signal measurement, the existing sensor generally includes 2 or 4 resistors forming a wheatstone bridge structure, and when the sensor adopts a wheatstone half-bridge structure, the sensor includes 2 resistors, and the connection point of the 2 resistors is the output end of the wheatstone half-bridge. When the sensor adopts a Wheatstone full-bridge structure, the sensor comprises 4 resistors, the 4 resistors are connected into two parallel Wheatstone half-bridges, and the output end of each Wheatstone half-bridge is the sensor output end.

Therefore, each sensor in the existing sensor structure at least comprises 2 resistors, when the number of the sensors is large, the number of the resistors is multiplied, the whole occupied area is large, and the sensors are difficult to apply to narrow surfaces. The traditional sensing signal detection circuit can only detect signals of a sensor with at least 2 resistors, and the number of the resistors in the sensor cannot be reduced so as to adapt to a narrow application scene, so that the application range is not wide and the practicability is not strong.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the present invention provides a circuit device and an electronic apparatus, which aim to solve the technical problem of how to reduce the area of a sensor and improve the application range of a sensing signal detection circuit.

In order to solve the technical problem, the utility model provides a circuit device, including signal processing circuit, analog front end circuit, resistance adjustment control circuit and at least one adjustable resistor, at least one adjustable resistor is used for being located with at least one the outside sensor resistance of circuit device connects and forms the wheatstone bridge, the output of wheatstone bridge is connected analog front end circuit's input, analog front end circuit's output is connected signal processing circuit's input, signal processing circuit's output is connected resistance adjustment control circuit's input, resistance adjustment control circuit's output is connected adjustable resistor's control end.

Optionally, the at least one adjustable resistor includes a first adjustable resistor, the at least one sensor resistor includes a first sensor resistor, the first adjustable resistor is connected with the first sensor resistor to form the wheatstone bridge, one end of the first adjustable resistor, which is far away from the first sensor resistor, is connected to a preset first reference input end, one end of the first sensor resistor, which is far away from the first adjustable resistor, is connected to a preset second reference input end, a connection line of the first adjustable resistor and the first sensor resistor leads out an output end of the wheatstone bridge, and an output end of the resistance value adjustment control circuit is connected to a control end of the first adjustable resistor.

Optionally, the circuit device further includes a first switch, and one end of the first adjustable resistor, which is far away from the first sensor resistor, is connected to a preset first reference input end through the first switch.

Optionally, the at least one adjustable resistor includes a second adjustable resistor and a third adjustable resistor, the at least one sensor resistor includes a second sensor resistor, and the circuit device further includes a second switch and a third switch; the second switch, the second adjustable resistor, the third adjustable resistor and the third switch are sequentially connected in series between a preset first reference input end and a preset second reference input end, a connection point of the second adjustable resistor and the third adjustable resistor is used for being connected with one end of the second sensor resistor, and the other end of the second sensor resistor is connected with the first reference input end or the second reference input end; the output end of the Wheatstone bridge is led out from the connection point of the second adjustable resistor, the third adjustable resistor and the second sensor resistor, and the output end of the resistance value adjusting control circuit is respectively connected with the control end of the second switch, the control end of the second adjustable resistor, the control end of the third adjustable resistor and the control end of the third switch.

Optionally, the at least one adjustable resistor includes a fourth adjustable resistor and a fifth adjustable resistor, the at least one sensor resistor includes a third sensor resistor and a fourth sensor resistor, and the circuit device further includes a fourth switch and a fifth switch; one end of the fourth adjustable resistor is led out of the first output end of the Wheatstone bridge and is used for being connected with the third sensor resistor, the other end of the fourth adjustable resistor is connected with a preset first reference input end through the fourth switch, and one end, far away from the fourth adjustable resistor, of the third sensor resistor is connected with a preset second reference input end; one end of the fifth adjustable resistor is led out of the second output end of the Wheatstone bridge and is used for being connected with the fourth sensor resistor, the other end of the fifth adjustable resistor is connected with a preset second reference input end through the fifth switch, and one end, far away from the fifth adjustable resistor, of the fourth sensor resistor is connected with a preset first reference input end; the first output end and the second output end are respectively connected with the input end of the analog front-end circuit, and the output end of the resistance value adjusting control circuit is respectively connected with the control end of the fourth switch, the control end of the fourth adjustable resistor, the control end of the fifth adjustable resistor and the control end of the fifth switch.

Optionally, the preset first reference input terminal is a positive reference input terminal, and the preset second reference input terminal is a negative reference input terminal; or, the preset first reference input end is a negative reference input end, and the preset second reference input end is a positive reference input end.

Optionally, the circuit device includes a plurality of adjustable resistors, the circuit device is configured to adapt to a plurality of sensors, at least one sensor resistor in each sensor is connected to at least one adjustable resistor in the circuit device to form a wheatstone bridge, and an output terminal of each wheatstone bridge is connected to an input terminal of the analog front-end circuit.

Optionally, the circuit device is a circuit board or a chip.

Furthermore, in order to solve the above technical problem, the present invention provides an electronic device including the sensing device as described above.

Optionally, the electronic device is a mobile terminal, a wearable device, a household appliance, an electronic scale, an electronic cigarette, an intelligent toilet, or an earphone.

The utility model provides a circuit arrangement and electronic equipment, its circuit arrangement include signal processing circuit, analog front end circuit, resistance adjustment control circuit and at least one adjustable resistor, at least one adjustable resistor be used for with at least one be located circuit arrangement outside sensor resistance connects and forms the wheatstone bridge, and the input of analog front end circuit is connected to the output of wheatstone bridge, and signal processing circuit's input is connected to the output of analog front end circuit, and signal processing circuit's output is connected resistance adjustment control circuit's input, and adjustable resistor's control end is connected to resistance adjustment control circuit's output. When the circuit device works, the adjustable resistor arranged in the circuit device is connected with the sensor resistor to form a Wheatstone bridge, the analog front-end circuit collects output signals of the Wheatstone bridge and sends the output signals to the signal processing circuit to be processed, so that the resistance value change of the sensor resistor is detected, and the change of pressure value, the change of light intensity or the change of temperature is calculated. Therefore, when the circuit device is matched with a sensor for use, the number of the sensor resistors required to be arranged in the sensor can be as low as 1 at least, so that the production cost of the sensor can be reduced, and the area of the sensor can be reduced. Moreover, because the resistance value of the adjustable resistor in the circuit device is variable, the resistance value adjusting control circuit can adjust the resistance value of the internal adjustable resistor according to the processing result of the signal processing circuit so as to adapt to the resistance value of the external sensor resistor, and the voltage formed by the external sensor resistor and the internal adjustable resistor is adapted to the signal sampling input range of the analog front-end circuit. Therefore, by adopting the embodiment, no matter the number of the resistors in the sensor is one or more, the circuit device can effectively detect the output signal of the sensor, and has wider application range and stronger practicability compared with the traditional sensing signal detection circuit.

Drawings

Fig. 1 is a schematic structural diagram of a circuit device according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a combined structure of the adjustable resistor of the circuit apparatus shown in fig. 1.

Fig. 3 is a schematic diagram of another combination structure of the adjustable resistor of the circuit apparatus shown in fig. 1.

Fig. 4 is a schematic structural diagram of another circuit device according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of another circuit device according to an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of another circuit device according to an embodiment of the present invention.

Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Fig. 8 is a schematic structural diagram of another electronic device according to an embodiment of the present invention.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention clearer and more obvious, the following description of the present invention with reference to the accompanying drawings and embodiments is provided for further details. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the following description, suffixes such as "module", "part", or "unit" used to denote elements are used only for the convenience of description of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.

It should be noted that the terms "first," "second," and the like in the description and in the claims, and in the drawings described above, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

In one embodiment, as shown in fig. 1, the present invention provides a circuit device 100, the circuit device 100 includes a signal processing circuit 110, an analog front-end circuit 120, a resistance adjustment control circuit 130, and at least one adjustable resistor 140 located outside the circuit device 100, the at least one adjustable resistor 140 is used for being connected with at least one sensor resistor 1 to form a wheatstone bridge, an input end of the analog front-end circuit 120 is connected to an output end of the wheatstone bridge, an input end of the signal processing circuit 110 is connected to an output end of the analog front-end circuit 120, an input end of the resistance adjustment control circuit 130 is connected to an output end of the signal processing circuit 110, and a control end of the adjustable resistor 140 is connected to an output end of the resistance adjustment control circuit 130.

In this embodiment, the sensor resistor 1 may be a force-sensitive resistor, a photo-sensitive resistor, or a thermistor. The wheatstone bridge may be a wheatstone half bridge or a wheatstone full bridge. When the wheatstone bridge is a half bridge, the wheatstone bridge is formed by connecting an adjustable resistor 140 in the circuit device 100 in series with a sensor resistor 1 outside the circuit device 100, wherein a connection point of the adjustable resistor 140 and the sensor resistor 1 is an output end of the wheatstone half bridge. The two ends of the adjustable resistor 140, which are connected in series with the sensor resistor 1, are respectively connected with a positive reference voltage and a negative reference voltage to supply power to the half-bridge wheatstone. When the sensor is influenced by the external environment to cause the resistance value of the sensor to change, the electric signal output by the output end of the Wheatstone half bridge changes. At this time, the analog front-end circuit samples and processes the electrical signal output from the output terminal of the wheatstone half-bridge as a single-ended input signal.

When the Wheatstone bridge is a full bridge, the Wheatstone bridge is formed by connecting two half bridges in parallel, wherein the output end of each half bridge is the output end of the sensor. When the resistance value of the sensor changes, the electric signal output by the output end of each Wheatstone half bridge changes. At this time, the analog front-end circuit samples and processes two electrical signals output from the output terminals of the two wheatstone half-bridges as differential input signals.

Specifically, the analog front-end circuit may be configured to perform analog-to-digital conversion on the above single input signal or the differential input signal to obtain a corresponding digital signal, and transmit the digital signal to the signal processing circuit for processing, so as to detect a change in the resistance of the sensor resistor 1, and further calculate a change in the pressure value, a change in the light intensity, or a change in the temperature. In some alternative embodiments, the analog front-end circuit may further amplify the above single input signal or differential input signal to facilitate processing by the signal processing circuit.

Because the signal sampling input range of the analog front-end circuit is limited, when the output signal of the output end of the Wheatstone bridge exceeds the signal sampling input range, the output signal cannot be detected. To solve this problem, a resistor for fitting to the sensor in the circuit device is designed as an adjustable resistor, and a resistance adjustment control circuit 130 is provided. In this way, before the sensor and the circuit device are assembled and shipped, the resistance value adjustment control circuit 130 can apply a control signal to the control end of the adjustable resistor 140, and further adjust the resistance value of the adjustable resistor 140 according to the resistance value of the sensor resistor 1, so that the output signal of the output end of the wheatstone bridge after the two are adapted is within the sampling range of the analog front-end circuit. Or, after the sensor and the circuit device are assembled, each time the power is turned on, the signal processing circuit 110 may adjust the resistance of the adjustable resistor 140 through the resistance adjustment control circuit 130 according to the detected signal, so that the resistance is matched with the resistance of the sensor resistor, thereby ensuring that the output signal of the output end of the wheatstone bridge is within the sampling range of the analog front-end circuit.

According to the embodiment, when the circuit device is used together with a sensor, the number of the sensor resistors required to be arranged in the sensor can be as low as 1 at least, so that the production cost of the sensor can be reduced, and the area of the sensor can be reduced. Moreover, since the adjustable resistor 140 in the circuit apparatus 100 has a variable resistance, the resistance adjustment control circuit 130 can adjust the resistance of the internal adjustable resistor 140 according to the processing result of the signal processing circuit 110 to adapt to the resistance of the external sensor resistor 1, so that the voltage formed by the external sensor resistor 1 and the internal adjustable resistor 140 is adapted to the signal sampling input range of the analog front-end circuit 120. Therefore, with the present embodiment, the circuit device 100 can effectively detect the output signal of the sensor no matter the number of the resistors included in the external sensor is one or more, and therefore, the application range is wider and the practicability is stronger than that of the traditional sensing signal detection circuit.

It should be noted that the functions of the signal processing circuit 110 and the analog front-end circuit 120 in this embodiment can be implemented by a commercially available circuit board of a commercially available chip, for example, the analog front-end circuit 120 can be implemented by an analog-to-digital converter in the commercially available chip. The control of the resistance of the adjustable resistor 140 by the resistance adjustment control circuit 130 can also be realized by the existing control logic. The main purpose of the present application is to utilize the existing functions of each circuit module or each circuit element itself, and through the improvement of the connection relation or the circuit structure, to constitute a circuit device capable of detecting the output signal of the sensor, so as to solve the technical problems of how to effectively reduce the production cost of the sensor, reduce the area of the sensor, and improve the application range of the sensing signal detection circuit in the prior art.

In an embodiment, the adjustable resistor 140 mentioned above may be formed by a plurality of resistors and a plurality of switches in series/parallel, and the embodiment takes six resistors and five switches as an example, and the specific combination form of the adjustable resistor 140 may be as shown in fig. 2 or fig. 3. Accordingly, the control terminals of the switches are the control terminals of the adjustable resistor, and the resistance adjustment control circuit 130 applies an electrical signal to the control terminals of the switches to control the on/off of each switch, so that when the number of the switches to be turned on is changed, the resistance of the adjustable resistor 140 is changed, thereby adjusting the resistance.

As shown in fig. 4, the utility model provides a circuit device 200, this circuit device 200 includes signal processing circuit 210, analog front end circuit 220, resistance adjustment control circuit 230 and first adjustable resistor R11, first adjustable resistor R11 is used for being connected with the first sensor resistor R21 that is located the circuit device 200 outside and forms the wheatstone bridge, analog front end circuit 220's input is connected to the output of wheatstone bridge, signal processing circuit 210's input is connected to analog front end circuit 220's output, signal processing circuit 210's output connection resistance adjustment control circuit 230's input, first adjustable resistor R11's control end is connected to resistance adjustment control circuit 230's output.

In this embodiment, one end of the first adjustable resistor R11, which is far away from the first sensor resistor R21, is connected to a preset first reference input terminal REF1, one end of the first sensor R21, which is far away from the first adjustable resistor R11, is connected to a preset second reference input terminal REF2, and a connection line between the first adjustable resistor R11 and the first sensor resistor R21 leads out an output end of the wheatstone bridge. Preferably, the circuit device 200 further includes a first switch SW1, and an end of the first adjustable resistor R11 away from the first sensor resistor R21 is connected to a preset first reference input terminal REF1 through the first switch SW1, so as to control on/off of the first adjustable resistor R11 through the first switch SW 1. A preset first reference input REF1 is a positive reference input and a preset second reference input REF2 is a negative reference input; alternatively, the default first reference input REF1 is a negative reference input and the default second reference input REF2 is a positive reference input. The wheatstone bridge of the present embodiment is a wheatstone half bridge, and the analog front-end circuit 220 samples a voltage at an output terminal of the wheatstone half bridge and sends the sampled voltage to the signal processing circuit 210 for comparison, so as to calculate a change in pressure, a change in temperature, a change in brightness, or the like from a voltage signal at the output terminal. When the circuit device 200 is used with a sensor, only the first sensor resistor R21 needs to be arranged in the sensor, so that the production cost of the sensor can be reduced, and the area of the sensor can be reduced. Moreover, since the resistance of the first adjustable resistor R11 in the circuit apparatus 200 is variable, the resistance adjustment control circuit 230 can adjust the resistance of the internal first adjustable resistor R11 according to the processing result of the signal processing circuit 210 to adapt to the resistance of the external first sensor resistor R21, so that the voltage formed by the first sensor resistor R21 and the first adjustable resistor R11 is adapted to the signal sampling input range of the analog front-end circuit 120. Therefore, with the present embodiment, no matter how large the resistance variation range of the first sensor resistor R21 in the sensor is, the circuit device 100 can effectively detect the output signal of the sensor, and therefore, the application range is wider and the practicability is stronger than that of the conventional sensing signal detection circuit.

In an embodiment, as shown in fig. 5, the present invention provides a circuit apparatus 300, where the circuit apparatus 300 includes a signal processing circuit 310, an analog front end circuit 320, a resistance adjustment control circuit 330, a second adjustable resistor R12 and a third adjustable resistor R13, the second adjustable resistor R12 and the third adjustable resistor R13 are sequentially connected in series between a preset first reference input terminal REF1 and a preset second reference input terminal REF2, a connection point of the second adjustable resistor R12 and the third adjustable resistor R13 is used to connect one end of a second sensor resistor R22 located outside the circuit apparatus 200, and the other end of the second sensor resistor R22 is connected to the first reference input terminal REF1 or the second reference input terminal REF 2; the output end of the wheatstone bridge is led out from the connection points of the second adjustable resistor R12, the third adjustable resistor R13 and the second sensor resistor R22, the output end of the wheatstone bridge is connected with the input end of the analog front-end circuit 320, the output end of the analog front-end circuit 320 is connected with the input end of the signal processing circuit 310, the output end of the signal processing circuit 310 is connected with the input end of the resistance value adjusting control circuit 230, and the output end of the resistance value adjusting control circuit 330 is respectively connected with the control end of the second adjustable resistor R12 and the control end of the third adjustable resistor R13.

In this embodiment, the circuit device 300 further includes a second switch SW2 and a third switch SW3, the second switch SW2, the second adjustable resistor R12, the third adjustable resistor R13 and the third switch SW3 are sequentially connected in series between the preset first reference input terminal REF1 and the preset second reference input terminal REF2, the second switch SW2 can control on/off of the second adjustable resistor R12, and the third switch SW3 can control on/off of the third adjustable resistor R13. The output terminal of the resistance adjustment control circuit 330 is further connected to the control terminal of the second switch SW2 and the control terminal of the third switch SW3, respectively.

Wherein the preset first reference input terminal REF1 is a positive reference input terminal, and the preset second reference input terminal REF2 is a negative reference input terminal; alternatively, the default first reference input REF1 is a negative reference input and the default second reference input REF2 is a positive reference input. The positive reference input end is used for connecting a positive reference voltage signal, and the negative reference input end is used for connecting a negative reference voltage signal, so that the Wheatstone bridge is powered. Optionally, the negative reference input terminal may be grounded or ungrounded, and may be selected according to actual needs, which is not limited in this application.

The wheatstone bridge of the present embodiment is a wheatstone half bridge, when one end of the second sensor resistor R22 far from the second adjustable resistor R12 or the third adjustable resistor R13 is connected to the preset first reference input terminal REF1, the resistance adjustment control circuit 330 controls the second switch SW2 to be turned off, so that the connection between the second adjustable resistor R12 and the first reference input terminal REF1 is turned off, meanwhile, the resistance adjustment control circuit 330 controls the connection of the third switch SW3 to connect the third adjustable resistor R13 with the second reference input terminal REF2, at this time, the third adjustable resistor R13 is connected with the second sensor resistor R22 to form a wheatstone half-bridge, the analog front-end circuit 320 samples the voltage at the output terminal of the wheatstone half-bridge and sends the sampled voltage to the signal processing circuit 310 for comparison, to calculate the change of pressure, or the change of temperature, or the change of brightness, etc. according to the voltage signal of the output terminal. When one end of the second sensor resistor R22, which is far from the second adjustable resistor R12 or the third adjustable resistor R13, is connected to a preset second reference input terminal REF2, the resistance adjustment control circuit 330 controls the second switch SW2 to be connected, so that the second adjustable resistor R12 is connected to the first reference input terminal REF1, and at the same time, the resistance adjustment control circuit 330 controls the third switch SW3 to be disconnected, so that the third adjustable resistor R13 is disconnected from the second reference input terminal REF2, at this time, the second adjustable resistor R12 is connected to the second sensor resistor R22 to form a wheatstone bridge, the analog front-end circuit 320 samples the voltage at the output terminal of the wheatstone bridge and sends the sampled voltage to the signal processing circuit 310 for comparison, so as to calculate the pressure change, the temperature change, the brightness change, and the like according to the voltage signal at the output terminal. Compared with the previous embodiment, in addition to having all the advantages of the previous embodiment, since the present embodiment is provided with two adjustable resistors and two switches, the signal detection requirement of the second sensor resistor R22 in different external access environments can be respectively met, and the application range of the circuit apparatus 200 is further enlarged and the practicability thereof is enhanced.

In one embodiment, as shown in fig. 6, the present invention provides a circuit device 400, where the circuit device 400 includes a signal processing circuit 410, an analog front end circuit 420, a resistance adjustment control circuit 430, a fourth adjustable resistor R14 and a fifth adjustable resistor R15, one end of the fourth adjustable resistor R14 leads out a first output end of a wheatstone bridge and is used for being connected with a third sensor resistor R23, and one end of the fifth adjustable resistor R15 leads out a second output end of the wheatstone bridge and is used for being connected with a fourth sensor resistor R24; the first output terminal and the second output terminal are respectively connected to the input terminal of the analog front-end circuit 420, and the output terminal of the resistance adjustment control circuit 430 is respectively connected to the control terminal of the fourth adjustable resistor R14 and the control terminal of the fifth adjustable resistor R15.

In the present embodiment, the circuit device 300 further includes a fourth switch SW4 and a fifth switch SW5,

one end of the fourth adjustable resistor R14, which is far away from the third sensor resistor R23, is connected to a preset first reference input terminal REF1 through a fourth switch SW4, one end of the third sensor resistor R23, which is far away from the fourth adjustable resistor R14, is connected to a preset second reference input terminal REF2, one end of the fifth adjustable resistor R15, which is far away from the fourth sensor resistor R24, is connected to a preset second reference input terminal REF2 through a fifth switch SW5, and one end of the fourth sensor resistor R24, which is far away from the fifth adjustable resistor R15, is connected to a preset first reference input terminal REF 1. The fourth switch SW4 may control the on/off of the fourth adjustable resistor R14, and the fifth switch SW5 may control the on/off of the fifth adjustable resistor R15. The output terminal of the resistance adjustment control circuit 430 is further connected to the control terminal of the fourth switch SW4 and the control terminal of the fifth switch SW5, respectively.

Wherein the preset first reference input terminal REF1 is a positive reference input terminal, and the preset second reference input terminal REF2 is a negative reference input terminal; alternatively, the default first reference input REF1 is a negative reference input and the default second reference input REF2 is a positive reference input.

The circuit arrangement 400 can be adapted to a single sensor (only the third sensor resistor R23 and the fourth sensor resistor R24 need to be provided in the sensor). When the fourth switch SW5 and the fifth switch SW5 are turned on simultaneously, the wheatstone bridge is a wheatstone full bridge, and the analog front-end circuit 420 samples voltages of a first output end and a second output end of the wheatstone full bridge respectively and sends the sampled voltages to the signal processing circuit 410 for comparison so as to calculate a change in pressure, a change in temperature, a change in brightness, and the like according to voltage signals of the first output end and the second output end.

The circuit device 400 can be adapted to two sensors (only the third sensor resistor R23 needs to be arranged in one sensor, and only the fourth sensor resistor R24 needs to be arranged in the other sensor), and can control the fourth switch SW5 and the fifth switch SW5 to be alternately switched on, so that two alternately switched-on wheatstone half-bridges are formed, and time-sharing alternate detection of signals generated by the two sensors is realized. At the moment, the number of the analog front-end circuits is only 1, and the signal detection of a plurality of sensors can be realized, so that the production cost of the circuit device and the whole sensor is reduced, and the area of the sensor is reduced. Moreover, since the resistance of the fourth adjustable resistor R14 and the resistance of the fifth adjustable resistor R15 in the circuit apparatus 400 are both variable, the resistance adjustment control circuit 430 may adjust the resistance of the internal fourth adjustable resistor R14 according to the processing result of the signal processing circuit 410 to adapt to the resistance of the external third sensor resistor R23, so that the voltage formed by the external third sensor resistor R23 and the fourth adjustable resistor R14 is adapted to the signal sampling input range of the analog front-end circuit 420, and adjust the resistance of the internal fifth adjustable resistor R15 according to the processing result of the signal processing circuit 410 to adapt to the resistance of the external fourth sensor resistor R24, so that the voltage formed by the external fourth sensor resistor R24 and the fifth adjustable resistor R15 is adapted to the signal sampling input range of the analog front-end circuit 420.

Therefore, with the present embodiment, no matter how large the resistance variation ranges of the third sensor resistor R23 and the fourth sensor resistor R24 are, the circuit device 400 can effectively detect the output signal of the sensor, and therefore, the application range is wider and the practicability is stronger than that of the conventional sensing signal detection circuit.

In one embodiment, the circuit arrangement includes a plurality of adjustable resistors, the circuit arrangement is adapted with a plurality of sensors, at least one sensor resistor in each sensor is connected with at least one adjustable resistor in the circuit arrangement to form a wheatstone bridge, and an output terminal of each wheatstone bridge is connected with an input terminal of the analog front end circuit.

In one embodiment, the circuit device is a circuit board or chip. Alternatively, the circuit arrangement may be provided on a circuit board or integrated in a chip.

In one embodiment, the present invention provides an electronic device, as shown in fig. 7, including a circuit device according to any one of the above embodiments.

In one embodiment, the electronic device is a mobile terminal, a wearable device, a household appliance, an electronic scale, an electronic cigarette, an intelligent toilet, or an earphone. Among them, the mobile terminal includes but is not limited to: mobile phones, notebook computers, tablet computers, electronic paper book readers, palm computers, POS machines and the like. Wearable devices include, but are not limited to, electronic bracelets, electronic watches, smart clothing, and the like. Automotive electronics include, but are not limited to, vehicle navigation devices, vehicle audio entertainment devices, vehicle instrument display devices, and the like. The household appliances include, but are not limited to, a refrigerator, an electric rice cooker, a washing machine, an air conditioner, an intelligent toilet, etc. Electronic scales include, but are not limited to, kitchen scales, weight scales, body fat scales, and the like. The circuit device can be applied to a pressure-sensitive key or a pressure touch screen of electronic equipment, or applied to other sensing modules of the electronic equipment, such as a light sensing module or a heat sensing module.

In some embodiments, the electronic device further comprises one or more sensors connected to the circuit arrangement, each sensor consisting of at least one sensor resistance. Wherein the sensor is arranged on a housing of the electronic device or below a screen of the electronic device. The circuit device is arranged in the electronic equipment and is connected with the sensor through a flexible circuit board, a flat cable or a printed circuit board. The circuit arrangement described above may be integrated in a chip or arranged on a circuit board.

Taking a mobile phone as an example, assuming that a pressure-sensitive key is prepared on a side frame of the mobile phone, as shown in fig. 8, a sensor resistor 1 (in this case, a force-sensitive resistor) may be attached to the side frame of the mobile phone, and the circuit device 100 may be disposed inside the mobile phone (for example, on a main board). Since the circuit device can be applied to the sensor only comprising a single resistor, at least 1 sensor resistor needs to be arranged in each sensor on the side frame of the mobile phone, and the side frame of the mobile phone can be made narrow.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims (10)

1. The circuit device is characterized by comprising a signal processing circuit, an analog front end circuit, a resistance value adjusting control circuit and at least one adjustable resistor, wherein the at least one adjustable resistor is used for being connected with at least one sensor resistor positioned outside the circuit device to form a Wheatstone bridge, the output end of the Wheatstone bridge is connected with the input end of the analog front end circuit, the output end of the analog front end circuit is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the resistance value adjusting control circuit, and the output end of the resistance value adjusting control circuit is connected with the control end of the adjustable resistor.

2. The circuit device according to claim 1, wherein the at least one adjustable resistor comprises a first adjustable resistor, the at least one sensor resistor comprises a first sensor resistor, the first adjustable resistor is connected with the first sensor resistor to form the wheatstone bridge, one end of the first adjustable resistor, which is far away from the first sensor resistor, is connected with a first preset reference input terminal, one end of the first sensor resistor, which is far away from the first adjustable resistor, is connected with a second preset reference input terminal, a connection line of the first adjustable resistor and the first sensor resistor leads out an output terminal of the wheatstone bridge, and an output terminal of the resistance value adjustment control circuit is connected with a control terminal of the first adjustable resistor.

3. The circuit arrangement of claim 2, further comprising a first switch, wherein an end of the first adjustable resistor remote from the first sensor resistor is connected to a predetermined first reference input terminal through the first switch.

4. The circuit arrangement of claim 1, wherein the at least one adjustable resistance comprises a second adjustable resistance and a third adjustable resistance, wherein the at least one sensor resistance comprises a second sensor resistance, and wherein the circuit arrangement further comprises a second switch and a third switch;

the second switch, the second adjustable resistor, the third adjustable resistor and the third switch are sequentially connected in series between a preset first reference input end and a preset second reference input end, a connection point of the second adjustable resistor and the third adjustable resistor is used for being connected with one end of the second sensor resistor, and the other end of the second sensor resistor is connected with the first reference input end or the second reference input end; the output end of the Wheatstone bridge is led out from the connection point of the second adjustable resistor, the third adjustable resistor and the second sensor resistor, and the output end of the resistance value adjusting control circuit is respectively connected with the control end of the second switch, the control end of the second adjustable resistor, the control end of the third adjustable resistor and the control end of the third switch.

5. The circuit arrangement of claim 1, wherein the at least one adjustable resistance comprises a fourth adjustable resistance and a fifth adjustable resistance, wherein the at least one sensor resistance comprises a third sensor resistance and a fourth sensor resistance, and wherein the circuit arrangement further comprises a fourth switch and a fifth switch;

one end of the fourth adjustable resistor is led out of the first output end of the Wheatstone bridge and is used for being connected with the third sensor resistor, the other end of the fourth adjustable resistor is connected with a preset first reference input end through the fourth switch, and one end, far away from the fourth adjustable resistor, of the third sensor resistor is connected with a preset second reference input end;

one end of the fifth adjustable resistor is led out of the second output end of the Wheatstone bridge and is used for being connected with the fourth sensor resistor, the other end of the fifth adjustable resistor is connected with a preset second reference input end through the fifth switch, and one end, far away from the fifth adjustable resistor, of the fourth sensor resistor is connected with a preset first reference input end;

the first output end and the second output end are respectively connected with the input end of the analog front-end circuit, and the output end of the resistance value adjusting control circuit is respectively connected with the control end of the fourth switch, the control end of the fourth adjustable resistor, the control end of the fifth adjustable resistor and the control end of the fifth switch.

6. A circuit arrangement as claimed in any one of claims 2 to 5, characterized in that the predetermined first reference input is a positive reference input and the predetermined second reference input is a negative reference input; or, the preset first reference input end is a negative reference input end, and the preset second reference input end is a positive reference input end.

7. A circuit arrangement as claimed in any one of claims 1 to 5, characterized in that the circuit arrangement comprises a plurality of adjustable resistors, the circuit arrangement being adapted to accommodate a plurality of sensors, at least one sensor resistor in each sensor being connected to at least one adjustable resistor in the circuit arrangement to form a Wheatstone bridge, an output of each Wheatstone bridge being connected to an input of the analog front-end circuit.

8. A circuit arrangement as claimed in any one of claims 1 to 5, characterized in that the circuit arrangement is a circuit board or a chip.

9. An electronic device comprising a circuit arrangement according to any one of claims 1 to 8 and at least one sensor, each said sensor comprising at least one sensor resistance.

10. The electronic device of claim 9, wherein the electronic device is a mobile terminal, a wearable device, a household appliance, an electronic scale, an electronic cigarette, a smart toilet, or an earphone.

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