Angle sensor circuit for double-layer circuit board stacking application

Abstract

The utility model relates to a double-layer circuit board stacking application angle sensor circuit, which comprises a power supply input interface protection circuit, a power supply circuit, a Hall chip module, a signal processing and adjusting circuit and an output interface circuit, the power supply circuit is electrically connected with the Hall chip module and the signal processing and adjusting circuit, signals of the Hall chip module are electrically connected with the signal processing and adjusting circuit, and the signal processing and adjusting circuit is electrically connected with the output interface circuit. According to the utility model, the power supply circuit is protected through the power supply input interface protection circuit, stable output of power supply voltage is ensured, angle signals are collected by the Hall chip module, voltage-to-current conversion processing is carried out by the signal processing and adjusting circuit, output signals are more stable, and the power supply circuit is separated from the signal processing and adjusting circuit, so that the cost is reduced. Signal interference is reduced, improvement of electromagnetic compatibility and overall circuit performance is facilitated, and the whole circuit is small in size, light in weight and completely sealed.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor circuits, in particular to an angle sensor circuit applied to the stacking of double-layer circuit boards. Background Art

[0002] The existing angle sensors use a single board to implement circuit functions. When the sensor rotating shaft rotates, the magnetic field of the magnet changes, and the Hall chip senses the magnetic field change and transmits the sensed data to the inside of the single-chip microcomputer or the signal processing module for processing. The processed data is output through the output interface circuit. The existing angle sensors use a single board to implement circuit functions. In terms of design, the single board inevitably has relatively poor electromagnetic interference suppression ability. In actual applications, the actual finished product made of a single board may be slightly larger in volume, which is not conducive to installation in a narrow space. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide an angle sensor circuit applied to the stacking of double-layer circuit boards aiming at the deficiencies of the above-mentioned existing technologies.

[0004] The technical solution of the utility model for solving the above technical problem is as follows: An angle sensor circuit applied to the stacking of double-layer circuit boards includes a power input interface protection circuit, a power circuit, a Hall chip module, a signal processing and regulating circuit, and an output interface circuit. The input end of the power input interface protection circuit is connected to an external power supply, the output end of the power input interface protection circuit is electrically connected to the input end of the power circuit, the output end of the power circuit is respectively electrically connected to the power input ends of the Hall chip module and the signal processing and regulating circuit, the signal output end of the Hall chip module is electrically connected to the signal input end of the signal processing and regulating circuit, the signal output end of the signal processing and regulating circuit is electrically connected to the input end of the output interface circuit, the output end of the output interface circuit outputs a detection signal externally, the power input interface protection circuit and the power circuit are jointly arranged on one layer, and the Hall chip module, the signal processing and regulating circuit, and the output interface circuit are jointly arranged on another layer.

[0005] The beneficial effects of the utility model are as follows: For the angle sensor circuit applied to the stacking of double-layer circuit boards of the utility model, the power input interface protection circuit protects the power circuit to ensure stable output of the power voltage. The Hall chip module is used to collect angle signals and is subjected to voltage-to-current conversion processing through the signal processing and regulating circuit, so that the output signal is more stable. At the same time, the power circuit and the signal processing and regulating circuit are separated, reducing signal interference, which is beneficial to improving electromagnetic compatibility and the overall circuit performance. The entire sensor circuit is small in volume, light in weight, and completely sealed, facilitating installation and use by customers, and is applicable to fields such as small-range mobile construction machinery and industrial machinery.

[0006] Based on the above technical solutions, the present utility model can also be improved as follows:

[0007] Further: The power input interface protection circuit includes a TVS tube T1, a capacitor C1, an inductor FB1, an inductor FB2, a capacitor C2, an inductor FB3, a capacitor C3, a capacitor C4, and a diode D1. The TVS tube T1 and the capacitor C1 are connected in parallel between the positive pole of the external power supply and the ground. The inductor FB1, the capacitor C2, and the inductor FB2 are provided. The common end of the capacitor C2 and the inductor FB2 is grounded. The inductor FB3, the capacitor C3, and the capacitor C4 are connected in series in sequence and then connected in parallel with the capacitor C2. The common end of the inductor FB3 and the capacitor C3 is electrically connected to the positive pole of the diode D1. The negative pole of the diode D1 is electrically connected to the input end of the power supply circuit. The common end of the capacitor C3 and the capacitor C4 is electrically connected to the analog signal ground.

[0008] The beneficial effect of the above further solution is: The TVS tube T1 can prevent damage to the circuit caused by electrostatic surges. The inductors FB1 and FB3, together with the capacitors C1 and C2, form an LC filter circuit, making the power input more stable and improving the anti-interference ability of the circuit. The diode D1 can play a role in preventing reverse connection.

[0009] Further: The power supply circuit includes a first step-down chip U1, a capacitor C5, a capacitor C6, a capacitor C7, a resistor R1, a capacitor C8, and a second step-down chip U2. The output end of the power input interface protection circuit is electrically connected to the input end of the first step-down chip U1. The input end and the grounding end of the first step-down chip U1 are grounded. A capacitor C6, a capacitor C7, and a resistor R1 are connected in parallel between the output end of the first step-down chip U1 and the ground. The output end of the first step-down chip U1 is electrically connected to the input end and the enable input end of the second step-down chip U2. The grounding end of the second step-down chip U2 is grounded. The output end of the second step-down chip U2 is grounded through the capacitor C8. The output end of the second step-down chip U2 is respectively electrically connected to the power input ends of the Hall chip module and the signal processing and regulation circuit.

[0010] The beneficial effect of the above further solution is: The power supply circuit is composed of two-stage step-down. The first-stage step-down circuit supplies power to the first step-down chip U1 through the output end VCC of the power supply circuit. The first step-down chip U1 is used as a linear voltage regulator to step down and output a 12V voltage. Among them, the capacitors C5 and C6 play a filtering role. The capacitor C7 is the input filter capacitor in the second-stage step-down module. The second step-down chip U2 is used as a linear voltage regulator to output a 5V voltage signal. The capacitor C8 plays a role in output filtering, making the output voltage signal more stable.

[0011] Further: The Hall chip module adopts a Hall effect sensor with the model number HAR3725.

[0012] The beneficial effects of the above further solution are as follows: two signals are output through the Hall chip module, and in cooperation with the peripheral filter capacitors C9 and C12, the power supply voltage input of the Hall chip module is made more stable, and C10 and C11 are filter capacitors to make the signal output by the Hall chip module more stable.

[0013] Furthermore: the signal processing and regulating circuit includes a first signal processing and regulating circuit and a second signal processing and regulating circuit. The input ends of the first signal processing and regulating circuit and the second signal processing and regulating circuit are respectively and correspondingly electrically connected to the two signal output ends of the Hall chip module, and the output ends of the first signal processing and regulating circuit and the second signal processing and regulating circuit are respectively electrically connected to the two input ends of the output interface circuit.

[0014] The beneficial effects of the above further solution are as follows: the two signals of the Hall chip module are respectively regulated and processed by the first signal processing and regulating circuit and the second signal processing and regulating circuit and then output to the output interface circuit, enhancing its current output capacity.

[0015] Further: The first signal processing and regulating circuit includes resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, resistor R9, zener diode D2, capacitor C13, capacitor C14, capacitor C15, capacitor C16, operational amplifier U4A, triode Q1, triode Q2, triode Q3, resistor R10, resistor R11, and resistor R12. Between a signal output terminal of the Hall chip module and the non-inverting input terminal of the operational amplifier U4A, resistor R2, resistor R3, and resistor R4 are sequentially connected in series. Between the non-inverting input terminal of the operational amplifier U4A and the positive power supply input terminal, capacitor C14 and capacitor C13 are connected in series, and the common terminal of capacitor C14 and capacitor C13 is connected to the analog signal ground. The zener diode D2 is electrically connected between the positive power supply input terminal of the operational amplifier U4A and the analog signal ground. The positive power supply input terminal of the operational amplifier U4A is electrically connected to the output terminal of the power supply circuit through resistor R7. Between the inverting input terminal of the operational amplifier U4A and the analog signal ground, resistor R5 and resistor R6 are connected in series. The inverting input terminal of the operational amplifier U4A is connected to the analog signal ground through capacitor C15. Between the inverting input terminal and the output terminal of the operational amplifier U4A, capacitor C16 is electrically connected. The negative power supply input terminal of the operational amplifier U4A is grounded. The output terminal of the operational amplifier U4A is electrically connected to the base of the triode Q1. The emitter of the triode Q1 is connected to the analog signal ground through resistor R10. The collector of the triode Q1 is electrically connected to the collectors of the triode Q2 and the base of the triode Q3 respectively. The emitter of the triode Q2 is electrically connected to the output terminal of the power supply circuit. Between the base and the emitter of the triode Q2, resistor R11 is electrically connected. The base of the triode Q2 is electrically connected to the emitter of the triode Q3. Between the common terminal of resistor R3 and resistor R4 and the collector of the triode Q3, resistor R9 and resistor R12 are connected in series, and the common terminal of resistor R9 and resistor R12 serves as an output terminal and is electrically connected to an input terminal of the output interface circuit. Between the common terminal of resistor R5 and resistor R6 and the collector of the triode Q3, resistor R8 is electrically connected.

[0016] The beneficial effects of the above further solution are: Resistor R7 plays a current limiting role, zener diode D2 stabilizes the power supply voltage of operational amplifier U4A, C13 is a filtering capacitor to make the power supply voltage of the operational amplifier more stable, capacitor C14 is a filtering capacitor for the input signal at the non-inverting terminal of the operational amplifier. The voltage collected by the Hall chip is connected in series through resistors to the non-inverting input terminal of the operational amplifier U4A. The output of the operational amplifier U4A is connected to the base of the triode Q1, and the IOUT1 signal is output through resistor R12.

[0017] Further: The second signal processing and regulating circuit includes resistor R13, resistor R14, resistor R15, resistor R16, resistor R17, resistor R18, resistor R19, capacitor C17, capacitor C18, capacitor C19, operational amplifier U4B, triode Q4, triode Q5, triode Q6, resistor R20, resistor R21 and resistor R22. A series connection of the resistor R13, resistor R14 and resistor R15 is sequentially arranged between the other signal output terminal of the Hall chip module and the non-inverting input terminal of the operational amplifier U4B. The non-inverting input terminal of the operational amplifier U4B is connected to the analog signal ground through the capacitor C17. A series connection of the resistor R16 and resistor R17 is arranged between the inverting input terminal of the operational amplifier U4B and the analog signal ground. The inverting input terminal of the operational amplifier U4B is connected to the analog signal ground through the capacitor C18. A capacitor C19 is electrically connected between the inverting input terminal and the output terminal of the operational amplifier U4B. The output terminal of the operational amplifier U4B is electrically connected to the base of the triode Q4. The emitter of the triode Q4 is connected to the analog signal ground through the resistor R20. The collector of the triode Q4 is electrically connected to the collector of the triode Q5 and the base of the triode Q6 respectively. The emitter of the triode Q5 is electrically connected to the output terminal of the power supply circuit. A resistor R21 is electrically connected between the base and the emitter of the triode Q5. The base of the triode Q5 is electrically connected to the emitter of the triode Q6. A resistor R18 is electrically connected between the common terminal of the resistor R16 and resistor R17 and the collector of the triode Q6. A series connection of the resistor R19 and resistor R22 is arranged between the common terminal of the resistor R14 and resistor R15 and the collector of the triode Q6. And the common terminal of the resistor R19 and resistor R22 serves as the output terminal and is electrically connected to the other input terminal of the output interface circuit.

[0018] The beneficial effect of the above further scheme is that the capacitor C17 is a filter capacitor for the input signal of the inverting terminal of the operational amplifier. The voltage collected by the Hall chip is serially connected to the non-inverting input terminal of the operational amplifier U4B through resistors. The output of the operational amplifier U4B is connected to the base of the triode Q4, and the IOUT2 signal is output through the resistor R22.

[0019] Further: The output interface circuit includes inductors FB4 and FB5, capacitors C20, C21, C22, and C23. Two signal output terminals of the signal processing and conditioning circuit are grounded through the capacitors C20 and C22 respectively. A series connection of the inductor FB4 and the capacitor C21 is provided between one signal output terminal of the signal processing and conditioning circuit and the analog signal ground. The common terminal of the inductor FB4 and the capacitor C21 serves as an output terminal to output a detection signal externally. A series connection of the inductor FB5 and the capacitor C23 is provided between the other signal output terminal of the signal processing and conditioning circuit and the analog signal ground. The common terminal of the inductor FB5 and the capacitor C23 serves as another output terminal to output another detection signal externally.

[0020] The beneficial effect of the above further solution is that the two current signals IOUT1 and IOUT2 output by the signal processing and conditioning module are output through the LC filter circuit. The filter circuit of the IOUT1 signal is composed of the inductor FB4, the filter capacitor C20, and the filter capacitor C21. The filter circuit of the IOUT2 signal is composed of the inductor FB5, the filter capacitor C22, and the filter capacitor C23, making the two output signals more stable. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of a dual-layer circuit board stacked application angle sensor circuit according to an embodiment of the present invention;

[0022] Figure 2 It is a schematic circuit diagram of a power input interface protection circuit according to an embodiment of the present invention;

[0023] Figure 3 It is a schematic circuit diagram of a power supply circuit according to an embodiment of the present invention;

[0024] Figure 4 It is a schematic circuit diagram of a Hall chip module according to an embodiment of the present invention;

[0025] Figure 5 It is a schematic circuit diagram of a signal processing and conditioning circuit according to an embodiment of the present invention;

[0026] Figure 6 It is a schematic circuit diagram of an output interface circuit according to an embodiment of the present invention. Detailed Embodiments

[0027] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0028] Such as Figure 1As shown in the figure, a double-layer circuit board stacked application angle sensor circuit includes a power input interface protection circuit, a power supply circuit, a Hall chip module, a signal processing and conditioning circuit, and an output interface circuit. The input end of the power input interface protection circuit is connected to an external power supply, the output end of the power input interface protection circuit is electrically connected to the input end of the power supply circuit, the output end of the power supply circuit is respectively electrically connected to the power input ends of the Hall chip module and the signal processing and conditioning circuit, the signal output end of the Hall chip module is electrically connected to the signal input end of the signal processing and conditioning circuit, the signal output end of the signal processing and conditioning circuit is electrically connected to the input end of the output interface circuit, and the output end of the output interface circuit outputs a detection signal externally. The power input interface protection circuit and the power supply circuit are jointly arranged on one layer, and the Hall chip module, the signal processing and conditioning circuit, and the output interface circuit are jointly arranged on another layer.

[0029] In the double-layer circuit board stacked application angle sensor circuit of the present utility model, the power input interface protection circuit protects the power supply circuit to ensure stable output of the power supply voltage. The Hall chip module is used to collect angle signals, and voltage-to-current conversion processing is performed through the signal processing and conditioning circuit, making the output signal more stable. At the same time, the power supply circuit and the signal processing and conditioning circuit are separated, reducing signal interference, which is beneficial to improving electromagnetic compatibility and the overall circuit performance. The entire sensor circuit is small in size, light in weight, and completely sealed, facilitating installation and use by customers, and is applicable to fields such as small-range mobile construction machinery and industrial machinery.

[0030] As Figure 2 shown, in one or more embodiments of the present utility model, the power input interface protection circuit includes a TVS tube T1, a capacitor C1, inductors FB1, FB2, a capacitor C2, inductors FB3, a capacitor C3, a capacitor C4, and a diode D1. The TVS tube T1 and the capacitor C1 are connected in parallel between the positive pole of the external power supply and the ground. The inductors FB1, C2, and FB2, the common end of the capacitor C2 and the inductor FB2 is grounded. The inductors FB3, C3, and C4 are sequentially connected in series and then connected in parallel with the capacitor C2. The common end of the inductor FB3 and the capacitor C3 is electrically connected to the positive pole of the diode D1, the negative pole of the diode D1 is electrically connected to the input end of the power supply circuit, and the common end of the capacitor C3 and the capacitor C4 is electrically connected to the analog signal ground. The TVS tube T1 can prevent damage to the circuit caused by electrostatic surges. The inductors FB1 and FB3, together with the capacitors C1 and C2, form an LC filter circuit, making the power input more stable and improving the anti-interference ability of the circuit. The diode D1 can play a role in preventing reverse connection.

[0031] As Figure 3As shown, in one or more embodiments of the present utility model, the power supply circuit includes a first step-down chip U1, a capacitor C5, a capacitor C6, a capacitor C7, a resistor R1, a capacitor C8, and a second step-down chip U2. The output end of the power input interface protection circuit is electrically connected to the input end of the first step-down chip U1. The input end and the ground end of the first step-down chip U1 are grounded. A capacitor C6, a capacitor C7, and a resistor R1 are connected in parallel between the output end of the first step-down chip U1 and the ground. The output end of the first step-down chip U1 is electrically connected to the input end and the enable input end of the second step-down chip U2. The ground end of the second step-down chip U2 is grounded. The output end of the second step-down chip U2 is grounded through the capacitor C8. The output end of the second step-down chip U2 is respectively electrically connected to the power input ends of the Hall chip module and the signal processing and regulating circuit.

[0032] Here, the power supply circuit consists of two-stage step-down. The first-stage step-down circuit supplies power to the first step-down chip U1 through the output end VCC of the power supply circuit. The first step-down chip U1 is used as a linear voltage regulator to step down and output a 12V voltage. Among them, the capacitors C5 and C6 play a filtering role. The capacitor C7 is the input filtering capacitor in the second-stage step-down module. The second step-down chip U2 is used as a linear voltage regulator to output a 5V voltage signal. The capacitor C8 plays a role in output filtering to make the output voltage signal more stable.

[0033] Optionally, in one or more embodiments of the present utility model, as Figure 4 shown, the Hall chip module adopts a Hall effect sensor with the model HAR3725. Two signals are output through the Hall chip module, and with the cooperation of the peripheral filtering capacitors C9 and C12, the power supply voltage input of the Hall chip module is made more stable. C10 and C11 are filtering capacitors to make the signals output by the Hall chip module more stable.

[0034] In one or more embodiments of the present utility model, the signal processing and regulating circuit includes a first signal processing and regulating circuit and a second signal processing and regulating circuit. The input ends of the first signal processing and regulating circuit and the second signal processing and regulating circuit are respectively electrically connected to the two signal output ends of the Hall chip module in correspondence. The output ends of the first signal processing and regulating circuit and the second signal processing and regulating circuit are respectively electrically connected to the two input ends of the output interface circuit. The two signals of the Hall chip module are respectively adjusted and processed by the first signal processing and regulating circuit and the second signal processing and regulating circuit, and then output to the output interface circuit to enhance its current output ability.

[0035] Specifically, in one or more embodiments of the present utility model, as Figure 5As shown, the first signal processing and regulating circuit includes resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, resistor R9, zener diode D2, capacitor C13, capacitor C14, capacitor C15, capacitor C16, operational amplifier U4A, triode Q1, triode Q2, triode Q3, resistor R10, resistor R11 and resistor R12. Between one signal output terminal of the Hall chip module and the non-inverting input terminal of the operational amplifier U4A, resistor R2, resistor R3 and resistor R4 are connected in series successively. Between the non-inverting input terminal of the operational amplifier U4A and the positive power supply input terminal, capacitor C14 and capacitor C13 are connected in series, and the common terminal of capacitor C14 and capacitor C13 is connected to the analog signal ground. The zener diode D2 is electrically connected between the positive power supply input terminal of the operational amplifier U4A and the analog signal ground. The positive power supply input terminal of the operational amplifier U4A is electrically connected to the output terminal of the power supply circuit through the resistor R7. Between the inverting input terminal of the operational amplifier U4A and the analog signal ground, resistor R5 and resistor R6 are connected in series. The inverting input terminal of the operational amplifier U4A is connected to the analog signal ground through the capacitor C15. Between the inverting input terminal and the output terminal of the operational amplifier U4A, capacitor C16 is electrically connected. The negative power supply input terminal of the operational amplifier U4A is grounded. The output terminal of the operational amplifier U4A is electrically connected to the base of the triode Q1. The emitter of the triode Q1 is connected to the analog signal ground through the resistor R10. The collector of the triode Q1 is electrically connected to the collector of the triode Q2 and the base of the triode Q3 respectively. The emitter of the triode Q2 is electrically connected to the output terminal of the power supply circuit. Between the base and the emitter of the triode Q2, resistor R11 is electrically connected. The base of the triode Q2 is electrically connected to the emitter of the triode Q3. Between the common terminal of resistor R3 and resistor R4 and the collector of the triode Q3, resistor R9 and resistor R12 are connected in series, and the common terminal of resistor R9 and resistor R12 is used as the output terminal and is electrically connected to one input terminal of the output interface circuit. Between the common terminal of resistor R5 and resistor R6 and the collector of the triode Q3, resistor R8 is electrically connected. The resistor R7 plays a current limiting role, the zener diode D2 plays a role in stabilizing the power supply voltage of the operational amplifier U4A, C13 is a filtering capacitor to make the power supply voltage of the operational amplifier more stable, capacitor C14 is a filtering capacitor for the input signal of the non-inverting terminal of the operational amplifier. The voltage collected by the Hall chip is connected in series through resistors to the non-inverting input terminal of the operational amplifier U4A. The output of the operational amplifier U4A is connected to the base of the triode Q1, and the IOUT1 signal is output through the resistor R12.

[0036] Specifically, in one or more embodiments of the present invention, as Figure 5As shown, the second signal processing and regulation circuit includes resistor R13, resistor R14, resistor R15, resistor R16, resistor R17, resistor R18, resistor R19, capacitor C17, capacitor C18, capacitor C19, operational amplifier U4B, triode Q4, triode Q5, triode Q6, resistor R20, resistor R21, and resistor R22. Between the other signal output terminal of the Hall chip module and the non-inverting input terminal of the operational amplifier U4B, the resistors R13, R14, and R15 are connected in series in sequence. The non-inverting input terminal of the operational amplifier U4B is connected to the analog signal ground through the capacitor C17. Between the inverting input terminal of the operational amplifier U4B and the analog signal ground, the resistors R16 and R17 are connected in series. The inverting input terminal of the operational amplifier U4B is connected to the analog signal ground through the capacitor C18. Between the inverting input terminal and the output terminal of the operational amplifier U4B, the capacitor C19 is electrically connected. The output terminal of the operational amplifier U4B is electrically connected to the base of the triode Q4. The emitter of the triode Q4 is connected to the analog signal ground through the resistor R20. The collector of the triode Q4 is electrically connected to the collector of the triode Q5 and the base of the triode Q6 respectively. The emitter of the triode Q5 is electrically connected to the output terminal of the power supply circuit. Between the base and the emitter of the triode Q5, the resistor R21 is electrically connected. The base of the triode Q5 is electrically connected to the emitter of the triode Q6. Between the common terminal of the resistors R16 and R17 and the collector of the triode Q6, the resistor R18 is electrically connected. Between the common terminal of the resistors R14 and R15 and the collector of the triode Q6, the resistors R19 and R22 are connected in series, and the common terminal of the resistors R19 and R22 is used as the output terminal and is electrically connected to the other input terminal of the output interface circuit.

[0037] Here, the capacitor C17 is the filtering capacitor for the input signal of the inverting terminal of the operational amplifier. The voltage collected by the Hall chip is connected in series to the non-inverting input terminal of the operational amplifier U4B through resistors, and the output of the operational amplifier U4B is connected to the base of the triode Q4, and the IOUT2 signal is output through the resistor R22.

[0038] As Figure 6As shown in the figure, in one or more embodiments of the present utility model, the output interface circuit includes inductors FB4 and FB5, capacitors C20, C21, C22, and C23. Two signal output terminals of the signal processing and conditioning circuit are grounded through capacitors C20 and C22 respectively. An inductor FB4 and a capacitor C21 are connected in series between a signal output terminal of the signal processing and conditioning circuit and the analog signal ground. The common terminal of the inductor FB4 and the capacitor C21 serves as an output terminal to output a detection signal externally. An inductor FB5 and a capacitor C23 are connected in series between another signal output terminal of the signal processing and conditioning circuit and the analog signal ground. The common terminal of the inductor FB5 and the capacitor C23 serves as another output terminal to output another detection signal externally. The two current signals IOUT1 and IOUT2 output by the signal processing and conditioning module are output through the LC filter circuit. The inductor FB4, the filter capacitor C20, and the filter capacitor C21 constitute the filter circuit for the IOUT1 signal, and the inductor FB5, the filter capacitor C22, and the filter capacitor C23 constitute the filter circuit for the IOUT2 signal, making the two output signals more stable.

[0039] The dual-layer circuit board stacked application angle sensor circuit of the present utility model has the following advantages:

[0040] 1. The angle sensor adopts a dual-layer circuit board stacked design, separating the power supply board and the signal board, and laying out lines such as signals, power supplies, and grounds in layers, reducing signal interference and being beneficial to improving electromagnetic compatibility and the overall circuit performance;

[0041] 2. The sensor is small in size and light in weight, facilitating installation and use by customers, and is suitable for fields such as small-range mobile construction machinery and industrial machinery;

[0042] 3. The power input interface is protected against electrostatic surges by adding TVS tubes, and an LC filter circuit is formed by inductors and capacitors to ensure stable output of the power supply voltage without being affected;

[0043] 4. The output interface circuit adopts LC filtering to make the signal output stably without being affected;

[0044] 5. The signal processing and conditioning module uses an operational amplifier plus a triode to convert the voltage collected by Hall into a 4 - 20 mA current output. Adding a triode enhances the current output ability. In a complex working environment, the voltage signal is easily affected by noise interference, and when the voltage signal is transmitted over a long distance, a voltage drop will occur due to the influence of the cable internal resistance. However, for the current, there is no such influence, making the output signal more stable;

[0045] 6. The sensor is completely sealed, eliminating environmental factors such as dust or moisture intrusion into the internal structure of the product, and is suitable for harsh environments such as dust, dirt, and humidity.

[0046] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A double-layer circuit board stacking application angle sensor circuit, characterized in that: It includes a power input interface protection circuit, a power circuit, a Hall chip module, a signal processing and regulation circuit and an output interface circuit. The input end of the power input interface protection circuit is connected to an external power supply, the output end of the power input interface protection circuit is electrically connected to the input end of the power circuit, the output end of the power circuit is electrically connected to the power input end of the Hall chip module and the signal processing and regulation circuit respectively, the signal output end of the Hall chip module is electrically connected to the signal input end of the signal processing and regulation circuit, the signal output end of the signal processing and regulation circuit is electrically connected to the input end of the output interface circuit, the output end of the output interface circuit outputs a detection signal to the outside, the power input interface protection circuit and the power circuit are arranged together on one layer, and the Hall chip module, the signal processing and regulation circuit and the output interface circuit are arranged together on another layer.

2. The angle sensor circuit for double-layer circuit board stacking according to claim 1 is characterized in that: The power input interface protection circuit includes a TVS tube T1, a capacitor C1, an inductor FB1, an inductor FB2, a capacitor C2, an inductor FB3, a capacitor C3, a capacitor C4 and a diode D1. The TVS tube T1 and the capacitor C1 are connected in parallel between the positive electrode of the external power supply and the ground. The common end of the inductor FB1, the capacitor C2 and the inductor FB2, the capacitor C2 and the inductor FB2 are grounded. The inductor FB3, the capacitor C3 and the capacitor C4 are connected in series in sequence and connected in parallel with the capacitor C2. The common end of the inductor FB3 and the capacitor C3 is electrically connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is electrically connected to the input end of the power circuit, and the common end of the capacitor C3 and the capacitor C4 is electrically connected to the analog signal ground.

3. The angle sensor circuit for stacking double-layer circuit boards according to claim 1, characterized in that: The power supply circuit includes a first buck chip U1, a capacitor C5, a capacitor C6, a capacitor C7, a resistor R1, a capacitor C8 and a second buck chip U2. The output end of the power input interface protection circuit is electrically connected to the input end of the first buck chip U1. The input end and the ground end of the first buck chip U1 are grounded. The capacitor C6, the capacitor C7 and the resistor R1 are connected in parallel between the output end of the first buck chip U1 and the ground. The output end of the first buck chip U1 is electrically connected to the input end and the enable input end of the second buck chip U2. The ground end of the second buck chip U2 is grounded. The output end of the second buck chip U2 is grounded through the capacitor C8. The output end of the second buck chip U2 is electrically connected to the power input end of the Hall chip module and the signal processing and regulation circuit respectively.

4. The double-layer circuit board stacking angle sensor circuit according to claim 1, characterized in that: The Hall chip module adopts a Hall effect sensor of model HAR3725.

5. The angle sensor circuit for double-layer circuit board stacking according to claim 1, characterized in that: The signal processing and regulation circuit includes a first signal processing and regulation circuit and a second signal processing and regulation circuit. The input end of the first signal processing and regulation circuit and the input end of the second signal processing and regulation circuit are respectively electrically connected to the two signal output ends of the Hall chip module, and the output end of the first signal processing and regulation circuit and the output end of the second signal processing and regulation circuit are respectively electrically connected to the two input ends of the output interface circuit.

6. The angle sensor circuit for stacking double-layer circuit boards according to claim 5, characterized in that: The first signal processing and regulating circuit includes a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a voltage stabilizing diode D2, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, an operational amplifier U4A, a transistor Q1, a transistor Q2, a transistor Q3, a resistor R10, a resistor R11 and a resistor R12. The resistor R2, the resistor R3 and the resistor R4 are connected in series in sequence between a signal output end of the Hall chip module and the in-phase input end of the operational amplifier U4A. The capacitor C14 and the capacitor C13 are connected in series between the in-phase input terminal and the positive power supply input terminal of the operational amplifier U4A, and the common terminal of the capacitor C14 and the capacitor C13 is connected to the analog signal ground. The voltage regulator diode D2 is electrically connected between the positive power supply input terminal of the operational amplifier U4A and the analog signal ground. The positive power supply input terminal of the operational amplifier U4A is electrically connected to the output terminal of the power supply circuit through the resistor R7. The resistor R5 and the resistor R6 are connected in series between the inverting input terminal of the operational amplifier U4A and the analog signal ground. The inverting input terminal of the amplifier U4A is connected to the analog signal ground through the capacitor C15, the capacitor C16 is electrically connected between the inverting input terminal and the output terminal of the operational amplifier U4A, the negative power input terminal of the operational amplifier U4A is grounded, the output terminal of the operational amplifier U4A is electrically connected to the base of the transistor Q1, the emitter of the transistor Q1 is connected to the analog signal ground through the resistor R10, the collector of the transistor Q1 is electrically connected to the collector of the transistor Q2 and the base of the transistor Q3, and the emitter of the transistor Q2 is electrically connected to the base of the transistor Q1. The output end of the power supply circuit is electrically connected, the resistor R11 is electrically connected between the base and emitter of the transistor Q2, the base of the transistor Q2 is electrically connected to the emitter of the transistor Q3, resistors R9 and R12 are connected in series between the common end of the resistors R3 and R4 and the collector of the transistor Q3, and the common end of the resistors R9 and R12 is electrically connected to an input end of the output interface circuit as an output end, and the resistor R8 is electrically connected between the common end of the resistors R5 and R6 and the collector of the transistor Q3.

7. The angle sensor circuit for stacking double-layer circuit boards according to claim 5, characterized in that: The second signal processing and regulating circuit includes a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a capacitor C17, a capacitor C18, a capacitor C19, an operational amplifier U4B, a transistor Q4, a transistor Q5, a transistor Q6, a resistor R20, a resistor R21 and a resistor R22. The resistor R13, the resistor R14 and the resistor R15 are connected in series in sequence between another signal output end of the Hall chip module and the in-phase input end of the operational amplifier U4B. The in-phase input end of the operational amplifier U4B is connected to the analog signal ground through the capacitor C17. The resistor R16 and the resistor R17 are connected in series between the inverting input end of the operational amplifier U4B and the analog signal ground. The inverting input end of the operational amplifier U4B is connected to the analog signal ground through the capacitor C18. The inverting input end of the operational amplifier U4B is electrically connected to the output end. The capacitor C19 and the output end of the operational amplifier U4B are electrically connected to the base of the transistor Q4, the emitter of the transistor Q4 is connected to the analog signal ground through the resistor R20, the collector of the transistor Q4 is electrically connected to the collector of the transistor Q5 and the base of the transistor Q6 respectively, the emitter of the transistor Q5 is electrically connected to the output end of the power supply circuit, the resistor R21 is electrically connected between the base and the emitter of the transistor Q5, the base of the transistor Q5 is electrically connected to the emitter of the transistor Q6, the resistor R18 is electrically connected between the common end of the resistor R16 and the resistor R17 and the collector of the transistor Q6, the resistor R19 and the resistor R22 are connected in series between the common end of the resistor R14 and the resistor R15 and the collector of the transistor Q6, and the common end of the resistor R19 and the resistor R22 is electrically connected to another input end of the output interface circuit as an output end.

8. The angle sensor circuit for double-layer circuit board stacking according to any one of claims 1 to 7, characterized in that: The output interface circuit includes an inductor FB4, an inductor FB5, a capacitor C20, a capacitor C21, a capacitor C22 and a capacitor C23. The two signal output ends of the signal processing and regulation circuit are grounded respectively through the capacitor C20 and the capacitor C22. The inductor FB4 and the capacitor C21 are connected in series between one signal output end of the signal processing and regulation circuit and the analog signal ground. The common end of the inductor FB4 and the capacitor C21 serves as an output end to output a detection signal to the outside. The inductor FB5 and the capacitor C23 are connected in series between the other signal output end of the signal processing and regulation circuit and the analog signal ground. The common end of the inductor FB5 and the capacitor C23 serves as another output end to output another detection signal to the outside.

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