An electric quantity sensor and a circuit thereof

Abstract

The application provides a kind of electric quantity sensor circuit, comprising: hall element circuit;First signal modulation circuit is connected with hall element circuit, to amplify the output signal of hall element circuit with modulation;Current amplification circuit is connected with current amplification circuit, to amplify the output current of first signal modulation circuit with processing;Wherein, first signal modulation circuit includes resistance R15, resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, resistance R21, capacitor C5, diode D5, operational amplifier chip U5 and triode Q4;Current amplification circuit includes resistance R22, resistance R23, resistance R24, resistance R25, capacitor C6, capacitor C7, capacitor C8, diode D6 and triode Q5.The signal processed by the above-mentioned mode can be stably output, and the reliability and detection accuracy of output signal can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric quantity sensor, in particular to an electric quantity sensor and a circuit thereof. BACKGROUND

[0002] The electric quantity sensor has the advantages of high reliability, high precision, small size, low power consumption, convenient maintenance and replacement, high cost performance, etc., and is commonly used in instruments, meters and high-precision electronic equipment.

[0003] In the circuit of the Hall electric quantity sensor, the output signal of the Hall element is usually directly amplified and modulated by a transistor or an operational amplifier, and the output is used as a detection signal or a control signal. The signal amplification method directly through the transistor or the operational amplifier cannot well amplify and modulate the output signal of the Hall element, which easily affects the reliability and detection precision of the final output signal. SUMMARY

[0004] The present application provides an electric quantity sensor and a circuit thereof to stabilize the output signal and ensure the reliability and detection precision of the final output signal.

[0005] One aspect of the embodiments of the present specification discloses an electric quantity sensor circuit, comprising: a Hall element circuit; a first signal modulation circuit connected with the Hall element circuit to amplify and modulate the output signal of the Hall element circuit; a current amplification circuit connected with the current amplification circuit to amplify and process the output current of the first signal modulation circuit; wherein the first signal modulation circuit comprises resistors R15, R16, R17, R18, R19, R20, R21, a capacitor C5, a diode D5, an operational amplifier chip U5 and a transistor Q4; the current amplification circuit comprises resistors R22, R23, R24, R25, capacitors C6, C7, C8, a diode D6 and a transistor Q5; one end of the resistor R15, one end of the resistor R16 and one end of the capacitor C5 are connected and connected with the output end of the Hall element circuit, the other end of the resistor R15 is grounded, the other end of the capacitor C5 is grounded, the other end of the resistor R16 is connected with one end of the resistor R20 and the non-inverting terminal of the operational amplifier chip U5, the inverting terminal of the operational amplifier chip U5 is connected with one end of the resistor R17 and one end of the resistor R18, the other end of the resistor R17 is grounded, the positive and negative electrodes of the operational amplifier chip U5 are respectively connected with voltage end VCC+ and voltage end VCC-, the output end of the operational amplifier chip U5 is connected with the negative electrode of the diode D5 and the base of the transistor Q4, the positive electrode of the diode D5 is grounded, the voltage end VCC is connected with the collector of the transistor Q4, the emitter of the transistor Q4 is connected with the other end of the resistor R18 and one end of the resistor R21; the other end of the resistor R20 and the other end of the resistor R21 are connected with one end of the capacitor C6, the other end of the capacitor C6 is connected with one end of the resistor R23, the positive electrode of the diode D6 and the base of the transistor Q5, the negative electrode of the diode D6 is connected with the resistor R22 grounded, the other end of the resistor R23 is connected with one end of the resistor R24 and the capacitor C7 grounded, and then the voltage end VCC is connected, the emitter of the transistor Q5 is connected with one end of the resistor R25 and one end of the capacitor C8, the other end of the resistor R25 and the other end of the capacitor C8 are connected and grounded, and the collector of the transistor Q5 is connected with the other end of the resistor R24 to serve as an output end VOUT1.

[0006] In one embodiment disclosed by the specification, the Hall element circuit comprises resistance R1, resistance R2, thermistor R3, thermistor R4, resistance R5, diode D1, diode D2, diode D3 and Hall chip U1; one end of the resistance R1 and one end of the resistance R2 are respectively connected with power terminal P1, the other end of the resistance R1 is connected with the negative electrode of the diode D1 and the positive electrode of the diode D2, the other end of the resistance R2 is connected with the positive electrode of the diode D1 and the negative electrode of the diode D3, the negative electrode of the diode D2 is connected with the positive input terminal of the Hall chip U1 through the pressure sensitive resistor R3, the positive electrode of the diode D3 is connected with the negative input terminal of the Hall chip U1 through the pressure sensitive resistor R4, and the output terminal of the Hall chip U1 is connected with one end of the resistance R15 through the resistance R5.

[0007] In one embodiment disclosed by the specification, the first signal modulation circuit further comprises resistance R6, resistance R7, resistance R8, capacitor C1 and operational amplifier chip U2, one end of the resistance R6, the positive electrode of the capacitor C1 and the inverting terminal of the operational amplifier chip U2 are connected with the resistance R5, the negative electrode of the capacitor C1 is grounded, the other end of the resistance R6 and the positive terminal of the operational amplifier chip U2 are connected with voltage terminal VCC, the negative terminal of the operational amplifier chip U2 is grounded, the non-inverting terminal of the operational amplifier chip U2 is connected with one end of the resistance R7 and one end of the resistance R8, the other end of the resistance R7 is connected with voltage terminal VCC, the other end of the resistance R8 is grounded, and the output terminal of the operational amplifier chip U2 is connected with one end of the resistance R15.

[0008] In one embodiment disclosed by the specification, the first signal modulation circuit further comprises capacitor C2, capacitor C3, resistance R9, resistance R10, diode D4, operational amplifier chip U3, operational amplifier chip U4 and triode Q1; the non-inverting terminal of the operational amplifier chip U3 is connected with one end of the resistance R10 and the non-inverting terminal of the operational amplifier chip U2, the inverting terminal of the operational amplifier chip U3 is connected with one end of the resistance R9, the negative electrode of the diode D4 and the positive electrode of the capacitor C2, the negative electrode of the capacitor C2 is grounded, the positive electrode of the diode D4 is connected with the other end of the resistance R9, the other end of the resistance R10, the output terminal of the operational amplifier chip U3 and the non-inverting terminal of the operational amplifier chip U4, the inverting terminal and the output terminal of the operational amplifier chip U4 are connected with the negative electrode of the capacitor C3, the base of the triode Q1 is connected with the output terminal of the operational amplifier chip U2, the emitter of the triode Q1 is grounded, and the collector of the triode Q1 is connected with the positive electrode of the capacitor C3 and then connected with one end of the resistance R15.

[0009] In one embodiment disclosed by the specification, the first signal modulation circuit further comprises resistors R11, R12, R13, R14, a capacitor C4 and a transistor Q3, the collector of the transistor Q1 is connected with the base of the transistor Q2, the emitter of the transistor Q2 is grounded, the collector of the transistor Q2 is connected with one end of the resistor R12, the other end of the resistor R12 is connected with one end of the resistor R11 and the base of the transistor Q3, the other end of the resistor R11 and the emitter of the transistor Q3 are connected with the voltage terminal VCC, the collector of the transistor Q3 is connected with the positive terminal of the capacitor C4, one end of the resistor R13 and one end of the resistor R14, the negative terminal of the capacitor C4 and the other end of the resistor R13 are grounded, and the other end of the resistor R14 is connected with one end of the resistor R15.

[0010] In one embodiment disclosed by the specification, the output terminal OUT1 is connected with a second signal modulation circuit, the second signal modulation circuit comprises a capacitor C9, a diode D7, resistors R26, R27, R28, R29, R30 and an operational amplifier chip U6, the positive terminal of the capacitor C9 is connected with the output terminal OUT1, the negative terminal of the capacitor C9 is connected with one end of the resistor R26 and the inverting terminal of the operational amplifier chip, the non-inverting terminal of the operational amplifier chip U6 is connected with one end of the resistor R29 and one end of the resistor R28, the other end of the resistor R28 is connected with one end of the resistor R27 and the positive terminal of the diode D7, the other end of the resistor R27 is connected with the voltage terminal VCC, the other end of the resistor R26, the other end of the resistor R29 and the negative terminal of the diode D7 are connected and grounded, the positive terminal of the operational amplifier chip U6 is connected with the voltage terminal VCC, the negative terminal of the operational amplifier chip U6 is grounded, and the output terminal of the operational amplifier chip U6 is connected with one end of the resistor R30 and serves as a final output terminal together, and the other end of the resistor R30 is connected with the voltage terminal VCC.

[0011] In another aspect of the embodiment disclosed by the specification, an electric quantity sensor is provided, comprising: a shell; a first circuit board arranged on the inner side of the shell; a first magnetic concentrating ring arranged in the shell; a copper plate arranged in the shell and above the first magnetic concentrating ring; a second circuit board arranged on the upper end surface of the copper plate; a second magnetic concentrating ring connected to the second circuit board; a connecting line having one end connected to the first circuit board and the other end extending out of the shell through the first magnetic concentrating ring; and the electric quantity sensor circuit according to any one of the above, a part of which is arranged on the first circuit board and another part of which is arranged on the second circuit board; wherein the first circuit board is connected with the second circuit board through a connector, and the first magnetic concentrating ring is arranged perpendicularly to the second magnetic concentrating ring.

[0012] In one embodiment disclosed in the specification, the connecting wire comprises a terminal post and a conductor wire, the terminal post is arranged on one side of the shell through a bushing, one end of the conductor wire is fixedly connected with the part of the terminal post inside the shell, and the other end extends outside through the first magnetic concentrating ring and the shell.

[0013] The embodiments of the present specification can at least achieve the following beneficial effects:

[0014] The electric quantity sensor circuit of the present application measures (detects) through the Hall element circuit, the output signal of the Hall element circuit is input to the non-inverting terminal of the operational amplifier chip U5 through the resistance R15, the capacitor C5 and the resistance R16, is amplified by the operational amplifier chip U5, the signal amplified is input to the base of the transistor Q4 through the resistance R19, is amplified by the transistor Q4, the signal amplified is fed back to the non-inverting terminal of the operational amplifier chip U5 through the resistance R21 and the resistance R20, and is input to the transistor Q5 through the resistance R21 and the capacitor C6, is amplified again by the transistor Q5, and the final signal is output from the output terminal VOUT1, that is, the output terminal VOUT1 is the final output terminal in the embodiment. The signal processed in the above manner can be stably output, and the reliability and detection accuracy of the output signal can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative effort.

[0016] Figure 1 The schematic diagram of the electric quantity sensor circuit involved in some embodiments of the present application.

[0017] Figure 2 The schematic diagram of the second signal modulation circuit involved in some embodiments of the present application.

[0018] Figure 3 The structural schematic diagram of the electric quantity sensor involved in some embodiments of the present application.

[0019] Figure 4 The Figure 3 The sectional view at A-A in FIG.

[0020] Reference signs:

[0021] 1, shell; 11, upper cover plate; 12, insulating plate; 13, copper plate; 14, bushing; 15, heat-conducting insulating silicone rubber sheet; 16, shielding wire;

[0022] 2, first circuit board; 3, second circuit board; 4, first magnetic concentrating ring; 5, second magnetic concentrating ring;

[0023] 61, spool; 62, conductor wire. DETAILED DESCRIPTION

[0024] In the following, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0025] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0026] The terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "plurality" is two or more, unless otherwise specifically limited.

[0027] In addition, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, can be fixed connection, or detachable connection, or integral; can be directly connected, or indirectly connected through intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0029] As Figure 1As shown, one aspect of the embodiment of the present specification discloses an electric quantity sensor circuit, comprising: a Hall element circuit; a first signal modulation circuit connected with the Hall element circuit to amplify and modulate the output signal of the Hall element circuit; a current amplification circuit connected with the current amplification circuit to amplify and process the output current of the first signal modulation circuit; wherein the first signal modulation circuit comprises resistors R15, R16, R17, R18, R19, R20, R21, a capacitor C5, a diode D5, an operational amplifier chip U5 and a transistor Q4; the current amplification circuit comprises resistors R22, R23, R24, R25, capacitors C6, C7, C8, a diode D6 and a transistor Q5; one end of the resistor R15, one end of the resistor R16 and one end of the capacitor C5 are connected and connected with the output end of the Hall element circuit, the other end of the resistor R15 is grounded, the other end of the capacitor C5 is grounded, the other end of the resistor R16 is connected with one end of the resistor R20 and the non-inverting terminal of the operational amplifier chip U5, the inverting terminal of the operational amplifier chip U5 is connected with one end of the resistor R17 and one end of the resistor R18, the other end of the resistor R17 is grounded, the positive and negative electrodes of the operational amplifier chip U5 are respectively connected with voltage end VCC+ and voltage end VCC-, the output end of the operational amplifier chip U5 is connected with the negative electrode of the diode D5 and the base of the transistor Q4, the positive electrode of the diode D5 is grounded, the voltage end VCC is connected with the collector of the transistor Q4, the emitter of the transistor Q4 is connected with the other end of the resistor R18 and one end of the resistor R21; the other end of the resistor R20 and the other end of the resistor R21 are connected with one end of the capacitor C6, the other end of the capacitor C6 is connected with one end of the resistor R23, the positive electrode of the diode D6 and the base of the transistor Q5, the negative electrode of the diode D6 is connected with the grounded resistor R22, the other end of the resistor R23 is connected with one end of the resistor R24 and the grounded capacitor C7, and then the voltage end VCC is connected, the emitter of the transistor Q5 is connected with one end of the resistor R25 and one end of the capacitor C8, the other end of the resistor R25 is connected with the other end of the capacitor C8, and then grounded, the collector of the transistor Q5 is connected with the other end of the resistor R24, and then the output end VOUT1 is obtained.

[0030] In the embodiment, the measurement (detection) is carried out by the Hall element circuit, the output signal of the Hall element circuit is input to the non-inverting terminal of the operational amplifier chip U5 through the resistor R15, the capacitor C5 and the resistor R16, is amplified by the operational amplifier chip U5, the amplified signal is input to the base of the transistor Q4 through the resistor R19, is amplified by the transistor Q4, one way of the amplified signal is fed back to the non-inverting terminal of the operational amplifier chip U5 through the resistor R21 and the resistor R20, and the other way of the amplified signal is input to the transistor Q5 through the resistor R21 and the capacitor C6, and is amplified again by the transistor Q5, and finally the signal is output from the output terminal VOUT1, that is, in the embodiment, the output terminal VOUT1 is the final output terminal. The signal processed in the above manner can be stably output, and the reliability and detection accuracy of the output signal can be improved.

[0031] In some embodiments, the Hall element circuit includes a resistor R1, a resistor R2, a thermistor R3, a thermistor R4, a resistor R5, a diode D1, a diode D2, a diode D3 and a Hall chip U1; one end of the resistor R1 and one end of the resistor R2 are respectively connected to the power terminal P1, the other end of the resistor R1 is connected to the negative electrode of the diode D1 and the positive electrode of the diode D2, the other end of the resistor R2 is connected to the positive electrode of the diode D1 and the negative electrode of the diode D3, the negative electrode of the diode D2 is connected to the positive input terminal of the Hall chip U1 through the thermistor R3, the positive electrode of the diode D3 is connected to the negative input terminal of the Hall chip U1 through the thermistor R4, and the output terminal of the Hall chip U1 is connected to one end of the resistor R15 through the resistor R5.

[0032] In the embodiment, the temperature compensation circuit is used to compensate for the change of the static working point caused by the change of the internal resistance at the ambient temperature, the static working point will be offset in the high and low temperature environment, the temperature compensation circuit composed of the diode D2, the diode D3, the thermistor R3 and the thermistor R4 can effectively compensate for the change of the internal resistance in the high and low temperature state, keep the working current of the Hall stable, and make the Hall as ideal as possible, and reduce the interference of environmental factors. Moreover, the symmetric compensation is carried out to ensure the stability of the forward and reverse working.

[0033] The voltage stabilizing circuit is used to ensure the linearity of the temperature curve of the Hall. The indium antimonide Hall has different dynamic curves in the constant voltage state and the constant current state, the diode D1 is used for voltage stabilization, so that the Hall is as ideal as possible in the constant voltage working state, and the linearity is maintained.

[0034] In some embodiments, the first signal modulation circuit further comprises a resistor R6, a resistor R7, a resistor R8, a capacitor C1 and an operational amplifier chip U2, one end of the resistor R6, a positive electrode of the capacitor C1 and an inverting terminal of the operational amplifier chip U2 are connected and then connected with the resistor R5, a negative electrode of the capacitor C1 is grounded, the other end of the resistor R6 and a positive terminal of the operational amplifier chip U2 are connected with a voltage terminal VCC, a negative terminal of the operational amplifier chip U2 is grounded, a non-inverting terminal of the operational amplifier chip U2 is connected with one end of the resistor R7 and one end of the resistor R8, the other end of the resistor R7 is connected with the voltage terminal VCC, the other end of the resistor R8 is grounded, and an output terminal of the operational amplifier chip U2 is connected with one end of the resistor R15.

[0035] Based on the above-mentioned embodiments, the device newly added in the present embodiment is connected between the resistor R5 and the resistor R15, that is, in the present embodiment, the resistor R5 is not connected with one end of the resistor R15; the output signal of the Hall element circuit is input to the operational amplifier chip U2 for operational amplification, and then is processed by the operational amplifier chip U5, the transistor Q4 and the transistor Q5 in sequence, and finally the signal is output from the output terminal VOUT1.

[0036] In some embodiments, the first signal modulation circuit further comprises a capacitor C2, a capacitor C3, a resistor R9, a resistor R10, a diode D4, an operational amplifier chip U3, an operational amplifier chip U4 and a transistor Q1; a non-inverting terminal of the operational amplifier chip U3 is connected with one end of the resistor R10 and a non-inverting terminal of the operational amplifier chip U2, an inverting terminal of the operational amplifier chip U3 is connected with one end of the resistor R9, a negative electrode of the diode D4 and a positive electrode of the capacitor C2, a negative electrode of the capacitor C2 is grounded, a positive electrode of the diode D4 is connected with the other end of the resistor R9, the other end of the resistor R10, an output terminal of the operational amplifier chip U3 and a non-inverting terminal of the operational amplifier chip U4, an inverting terminal and an output terminal of the operational amplifier chip U4 are connected with a negative electrode of the capacitor C3, a base of the transistor Q1 is connected with the output terminal of the operational amplifier chip U2, an emitter of the transistor Q1 is grounded, and a collector of the transistor Q1 is connected with a positive electrode of the capacitor C3 and then connected with one end of the resistor R15.

[0037] Based on the above-mentioned embodiments, the device newly added in the present embodiment is connected between the operational amplifier chip U2 and the resistor R15, that is, in the present embodiment, the output terminal of the operational amplifier chip U2 is not connected with one end of the resistor R15; the output signal of the Hall element circuit is input to the operational amplifier chip U2 for operational amplification, is amplified by the transistor Q1, and then is processed by the operational amplifier chip U5, the transistor Q4 and the transistor Q5 in sequence, and finally the signal is output from the output terminal VOUT1.

[0038] In some embodiments, the first signal modulation circuit further comprises resistors R11, R12, R13, R14, a capacitor C4 and a transistor Q3, the collector of the transistor Q1 is connected to the base of the transistor Q2, the emitter of the transistor Q2 is grounded, the collector of the transistor Q2 is connected to one end of the resistor R12, the other end of the resistor R12 is connected to one end of the resistor R11 and the base of the transistor Q3, the other end of the resistor R11 and the emitter of the transistor Q3 are connected to a voltage terminal VCC, the collector of the transistor Q3 is connected to the positive terminal of the capacitor C4, one end of the resistor R13 and one end of the resistor R14, the negative terminal of the capacitor C4 and the other end of the resistor R13 are grounded, and the other end of the resistor R14 is connected to one end of the resistor R15.

[0039] Based on the above embodiments, the device newly added in the present embodiment is connected between the transistor Q1 and the resistor R15, that is, in the present embodiment, the collector of the transistor Q1 is connected to the positive terminal of the capacitor C3 and is not connected to one end of the resistor R15. The output signal of the Hall element circuit is input to the operational amplifier chip U2 for operational amplification, and then is amplified by the transistors Q1, Q2 and Q3, and is sequentially processed by the operational amplifier chip U5, the transistors Q4 and Q5, and finally the signal is output from the output terminal VOUT1.

[0040] In some embodiments, the output terminal OUT1 is connected to a second signal modulation circuit, and the second signal modulation circuit comprises a capacitor C9, a diode D7, resistors R26, R27, R28, R29, R30 and an operational amplifier chip U6. The positive terminal of the capacitor C9 is connected to the output terminal OUT1, the negative terminal of the capacitor C9 is connected to one end of the resistor R26 and the inverting terminal of the operational amplifier chip, the non-inverting terminal of the operational amplifier chip U6 is connected to one end of the resistor R29 and one end of the resistor R28, the other end of the resistor R28 is connected to one end of the resistor R27 and the positive terminal of the diode D7, the other end of the resistor R27 is connected to a voltage terminal VCC, the other end of the resistor R26, the other end of the resistor R29 and the negative terminal of the diode D7 are grounded after being connected, the positive terminal of the operational amplifier chip U6 is connected to a voltage terminal VCC, the negative terminal of the operational amplifier chip U6 is grounded, and the output terminal of the operational amplifier chip U6 is connected to one end of the resistor R30 to serve as a final output terminal together, and the other end of the resistor R30 is connected to a voltage terminal VCC.

[0041] Based on the above embodiment, the device newly added in the present embodiment is connected after the output terminal OUT1, that is, in the present embodiment, the output terminal OUT1 is not the final output terminal; the output signal of the Hall element circuit is input to the operational amplifier chip U2 for operational amplification, then is amplified by the transistors Q1, Q2 and Q3, and is sequentially processed by the operational amplifier chip U5, the transistor Q4 and the transistor Q5, and the signal is input from the output terminal VOUT1 to the operational amplifier chip U6 through the capacitor C9, and is output after operational amplification by the operational amplifier chip U6, that is, the output terminal of the operational amplifier chip U6 is the final output terminal.

[0042] In some embodiments, the second signal modulation circuit further comprises a transistor Q6, a resistor R31, a resistor R32, a resistor R33, a resistor R34, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C15 and an operational amplifier chip U7; the base of the transistor Q6 is connected with the output terminal of the operational amplifier chip U6, the emitter of the transistor Q6 is grounded, the collector of the transistor Q6 is connected with one end of the resistor R31, the other end of the resistor R31 is connected with one end of the capacitor C11 and one end of the capacitor C10, the other end of the capacitor C10 is connected with one end of the resistor R32, one end of the capacitor C13 and the output terminal of the operational amplifier chip U7, the other end of the resistor R32 is connected with one end of the capacitor C12 and the inverting terminal of the operational amplifier chip U7, the other end of the capacitor C12 is connected with the other end of the capacitor C11 and one end of the resistor R31, the non-inverting terminal of the operational amplifier chip U7 is connected with one end of the resistor R33, one end of the resistor R34 and the positive electrode of the capacitor C14, the other end of the resistor R33, the other end of the resistor R31 and the negative electrode of the capacitor C14 are grounded after being connected, the positive electrode of the capacitor C15 is connected with the other end of the resistor R34 after being connected with the voltage terminal VCC, the negative electrode of the capacitor C15 is grounded, and the other end of the capacitor C13 is the final output terminal.

[0043] Based on the above embodiment, the device newly added in the present embodiment is connected after the output terminal OUT1, that is, in the present embodiment, the output terminal OUT1 is not the final output terminal; the output signal of the Hall element circuit is input to the operational amplifier chip U2 for operational amplification, then is amplified by the transistors Q1, Q2 and Q3, and is sequentially processed by the operational amplifier chip U5, the transistor Q4 and the transistor Q5, and the signal is input from the output terminal VOUT1 to the operational amplifier chip U6, by the operational amplifier chip U6 for operational amplification, and is output to the transistor Q6, is amplified by the transistor Q6, and is output after operational amplification by the operational amplifier chip U7 through the capacitor C13, that is, the other end of the capacitor C13 is the final output terminal.

[0044] In some embodiments, the second signal modulation circuit further comprises a diode D8, a rheostat R35, a resistor R36, a capacitor C16, a capacitor C17 and an operational amplifier chip U8; the positive electrode of the diode D8 is connected with the voltage terminal VCC, the negative electrode of the diode D8 is connected with the positive electrode of the operational amplifier chip U8, the first fixed terminal of the rheostat R35 is connected with the other end of the capacitor C13, the movable terminal of the rheostat R35 is connected with the in-phase terminal of the operational amplifier chip U8, the bypass terminal of the operational amplifier chip U8 is connected with the positive electrode of the capacitor C16, the inverting terminal and the negative electrode of the operational amplifier chip U8, the second fixed terminal of the rheostat R35, the negative electrode of the capacitor C16 and one end of the capacitor C17 are connected and grounded, the other end of the capacitor C17 is connected with one end of the resistor R36, the output terminal of the operational amplifier chip U8 is connected with the other end of the resistor R36 and serves as the final output terminal.

[0045] Based on the above embodiments, the device newly added in the present embodiment is connected with the other end of the capacitor C13, that is, in the present embodiment, the other end of the capacitor C13 is not the final output terminal; the output signal of the Hall element circuit is input to the operational amplifier chip U2 for operational amplification, then input to the triode Q1, the triode Q2 and the triode Q3 for signal amplification, then input to the operational amplifier chip U5, the triode Q4 and the triode Q5 for processing in sequence, the signal is input to the operational amplifier chip U6 through the capacitor C9 from the output terminal VOUT1, then output to the triode Q6 after operational amplification by the operational amplifier chip U6, then input to the operational amplifier chip U7 after signal amplification by the triode Q6, then output to the operational amplifier chip U8 through the capacitor C13 and the rheostat R35 after operational amplification by the operational amplifier chip U7, and finally output after operational amplification by the operational amplifier chip U8, that is, the output terminal of the operational amplifier chip U8 is the final output terminal.

[0046] In some embodiments, the second signal modulation circuit further comprises resistors R37, R38, R39, R40, R41, R42, R43, R44, capacitors C18, C19, C20, C21, a transistor Q7 and an operational amplifier chip U9; one end of the resistor R37 is connected to the output end of the operational amplifier chip U8 and the positive electrode of the capacitor C18, the negative electrode of the capacitor C18 is connected to one end of the resistor R38 and the base of the transistor Q7, the other end of the resistor R38 is connected to one end of the resistor R39, the positive electrode of the capacitor C19 and the collector of the transistor Q7, the other end of the resistor R39 is connected to one end of the resistor R43 and then connected to the voltage terminal VCC, the negative electrode of the capacitor C19 is connected to one end of the resistor R40, the other end of the resistor R40 is connected to the other end of the resistor R43, one end of the resistor R41 and the non-inverting terminal of the operational amplifier chip U9, the other end of the resistor R37, the emitter of the transistor Q7, the other end of the resistor R41 and the negative electrode of the capacitor C20 are connected and then grounded, the positive electrode of the capacitor C20 is connected to one end of the resistor R42, the other end of the resistor R42 is connected to one end of the capacitor C21, one end of the resistor R44 and the inverting terminal of the operational amplifier chip U9, the positive terminal of the operational amplifier chip U9 is connected to the voltage terminal VCC, the negative terminal of the operational amplifier chip U9 is grounded, and the output end of the operational amplifier chip U9 is connected to the other end of the capacitor C21 and the other end of the resistor R44, and then serves as the output terminal VOUT2.

[0047] Based on the above embodiments, the device newly added in this embodiment is connected after the output end of the operational amplifier chip U8, that is, in this embodiment, the output end of the operational amplifier chip U8 is not the final output end; the output signal of the Hall element circuit is input to the operational amplifier chip U2 for operational amplification, then input to the transistors Q1, Q2 and Q3 for signal amplification, then sequentially processed by the operational amplifier chip U5, the transistor Q4 and the transistor Q5, the signal is input to the operational amplifier chip U6 through the capacitor C9 from the output terminal VOUT1, and then output to the transistor Q6 after operational amplification by the operational amplifier chip U6, and then input to the operational amplifier chip U8 through the capacitor C13 and the variable resistor R35 after signal amplification by the transistor Q6 and operational amplification by the operational amplifier chip U7, and then input to the transistor Q7 through the capacitor C18 after operational amplification by the operational amplifier chip U8, and then output from the output terminal VOUT2 after signal amplification by the transistor Q7 and operational amplification by the operational amplifier chip U9; wherein the capacitor C21 and the resistor R44 form a feedback loop. That is, the output terminal VOUT2 is the final output terminal.

[0048] In summary, based on different implementation scenarios, different embodiments described above can be applied, different device parameters can be set according to actual conditions, and different signal modulation effects can be achieved to achieve the required reliability and detection accuracy.

[0049] Another aspect of the embodiments of the present specification discloses an electric quantity sensor, comprising: a shell 1; a first circuit board 2 arranged on the inner side of the shell 1; a first magnetic concentrating ring 4 arranged inside the shell 1; a copper plate 13 arranged inside the shell 1 and above the first magnetic concentrating ring 4; a second circuit board 3 arranged on the upper end surface of the copper plate 13; a second magnetic concentrating ring 5 connected to the second circuit board 3; a connecting wire, one end of which is connected to the first circuit board 2, and the other end of which extends outside through the first magnetic concentrating ring 4 and the shell 1; and an electric quantity sensor circuit of any one of the above, a part of which is arranged on the first circuit board 2 and the other part of which is arranged on the second circuit board 3; wherein the first circuit board 2 is connected to the second circuit board 3 through a connector, and the first magnetic concentrating ring 4 and the second magnetic concentrating ring 5 are arranged vertically.

[0050] In some embodiments, the connecting wire comprises a spool 61 and a conductor wire 62, the spool 61 is arranged on one side of the shell 1 through the bushing 14, and one end of the conductor wire 62 is fixedly connected to the part of the spool 61 inside the shell 1, and the other end of the conductor wire 62 extends outside through the first magnetic concentrating ring 4 and the shell 1.

[0051] In summary, it can be understood that the connection mode between the electric quantity sensor circuit on the first magnetic concentrating ring 4, the second magnetic concentrating ring 5, the shielding wire 16, the conductor wire 62, the first circuit board 2 and the second circuit board 3 is the existing mature scheme, and no emphasis is placed on the description, and the focus of the electric quantity sensor is that the first magnetic concentrating ring 4 and the second magnetic concentrating ring 5 are arranged vertically in space; the shell 1 is divided into two parts by the copper plate 13, the two parts are respectively installed with the first magnetic concentrating ring 4 and the second magnetic concentrating ring 5, and the current measurement and the voltage measurement are realized through the corresponding electric quantity sensor circuits on the first circuit board 2 and the second circuit board 3, that is, the current measurement part and the voltage measurement part are separated by the copper plate 13, each independent sensor is surrounded by a magnetic material to sense five-eighths of the magnetic field, and the magnetic field is half-enclosed in this way, which can effectively guarantee the integrity of the measured magnetic circuit and the stability of the measured magnetic field, and can shield the mutual influence of the two independent part measurement magnetic fields and external electromagnetic interference, thereby ensuring the measurement accuracy; the inner circle of the magnetic concentrating ring is increased with a metal shield, and under the condition that the metal shield closes five-eighths of the magnetic induction area of the magnetic concentrating ring, the magnetic concentrating ring can accurately sense the primary side electric signal magnetic field, and can effectively prevent the mutual interference of external electromagnetic interference and internal voltage and current magnetic fields, thereby achieving stable, accurate and pure measurement.

[0052] In the assembly process:

[0053] 1. The conductor wire 62 is a silver-plated copper conductor wire, which is processed and formed according to the typical process of Q / RC.J05.007-2009, the wire length is 250 mm, the head is required to be stripped by 4 mm, the part of the core wire is removed, the remaining core wire is stirred, the outer diameter is slightly smaller than 4 mm, and the stirred tin is treated.

[0054] 2, tin conductor line 62 is aligned with the groove hole of the terminal shaft 61, and is filled with tin material using a 200W soldering iron. The soldering tin is required to be full, and the filling height is to overflow the groove hole.

[0055] 3, the needle (connector) of the second circuit board 3 is welded to the corresponding position of the first circuit board 2, and the board distance is required to be 3mm.

[0056] 4, the second magnetic ring 5 is welded at the corresponding position of the second circuit board 3, and the voltage parameter is debugged according to RC3.910.313S. After debugging, it is cleaned with rectified alcohol, and treated with three-proofing paint.

[0057] 5, the heat-conducting insulating silica gel sheet 15 is trimmed with scissors to pass through the hole, the terminal shaft 61 is passed through the heat-conducting insulating silica gel sheet 15 according to the indicated position, and is installed in the hole of the first circuit board 2 which has passed the debugging, and the terminal shaft 61 is fixed with the first circuit board 2 by soldering.

[0058] 6, the bushing 14 is passed through the mounting hole of the shell 1 from inside to outside, and is fixed with a little 401 glue.

[0059] 7, the installed terminal shaft 61 is passed through the bushing 14. The red line of the first magnetic ring 4 is connected with the core wire of the shielding wire 16, and the black line is mixed and treated.

[0060] 8, the copper plate 13 is installed through the sliding groove according to the indicated position, and is fixed with the second circuit board 3 and the copper plate 13 by cooperating with the screw and the nut; the first magnetic ring 4 is installed in the inner cavity of the shell 1, and the shielding wire 16 is led out from the indicated position. The mixed black line of the first magnetic ring 4 is crimped in the gap between the screw and the nut.

[0061] 9, the insulating plate 12 is covered, and is fixed by dipping the countersunk screw into the thread glue.

[0062] 10, the silicone rubber is configured, is injected, the upper cover plate 11 is slid into assembly according to the indicated position, and is fixed by dipping the countersunk screw into the thread glue.

[0063] 11, the riveting nut is riveted into the shell 1.

[0064] In summary, the application discloses a plurality of specific embodiments. In the case of not being self-contradictory, each embodiment can be freely combined to form a new embodiment, that is, the embodiments belonging to the replacement scheme can be freely replaced, but cannot be combined with each other; the embodiments not belonging to the replacement scheme can be combined with each other, and these new embodiments also belong to the essential content of the application.

[0065] The above embodiments describe a plurality of specific embodiments of the application, but those skilled in the art should understand that various changes or modifications can be made to these embodiments without departing from the principles and essence of the application, and these changes and modifications all fall within the protection scope of the application.

Claims

1. A power sensor circuit, characterized in that, include: Hall element circuit; A first signal modulation circuit is connected to the Hall element circuit to amplify and modulate the output signal of the Hall element circuit. A current amplifier circuit is connected to the first signal modulation circuit to amplify the output current of the first signal modulation circuit. The first signal modulation circuit includes resistors R15, R16, R17, R18, R19, R20, and R21, capacitor C5, diode D5, operational amplifier chip U5, and transistor Q4; the current amplification circuit includes resistors R22, R23, R24, and R25, capacitors C6, C7, and C8, diode D6, and transistor Q5. One end of resistor R15, one end of resistor R16, and one end of capacitor C5 are connected to the output terminal of the Hall element circuit. The other end of resistor R15 is grounded, the other end of capacitor C5 is grounded, the other end of resistor R16 is connected to one end of resistor R20 and the non-inverting input of operational amplifier chip U5, the inverting input of operational amplifier chip U5 is connected to one end of resistor R17 and one end of resistor R18, the other end of resistor R17 is grounded, the positive and negative terminals of operational amplifier chip U5 are respectively connected to external voltage terminals VCC+ and VCC-, the output terminal of operational amplifier chip U5 is connected to the negative terminal of diode D5 and the base of transistor Q4, the positive terminal of diode D5 is grounded, the collector of transistor Q4 is connected to external voltage terminal VCC, and the emitter of transistor Q4 is connected to the other end of resistor R18 and one end of resistor R21. The other ends of resistor R20 and resistor R21 are connected to one end of capacitor C6. The other end of capacitor C6 is connected to one end of resistor R23, the anode of diode D6, and the base of transistor Q5. The cathode of diode D6 is connected to grounded resistor R22. The other end of resistor R23 is connected to one end of resistor R24 ​​and grounded capacitor C7, and then connected to the external voltage terminal VCC. The emitter of transistor Q5 is connected to one end of resistor R25 and one end of capacitor C8. The other end of resistor R25 is connected to the other end of capacitor C8 and then grounded. The collector of transistor Q5 is connected to the other end of resistor R24, and together they serve as the output terminal VOUT1.

2. The power sensor circuit according to claim 1, characterized in that, The Hall element circuit includes resistors R1 and R2, thermistor R3 and R4, resistor R5, diodes D1, D2, and D3, and Hall chip U1. One end of resistor R1 and one end of resistor R2 are respectively connected to power supply terminal P1. The other end of resistor R1 is connected to the cathode of diode D1 and the anode of diode D2. The other end of resistor R2 is connected to the anode of diode D1 and the cathode of diode D3. The cathode of diode D2 is connected to the anode input terminal of Hall chip U1 through the thermistor R3. The anode of diode D3 is connected to the cathode input terminal of Hall chip U1 through the thermistor R3. The output terminal of Hall chip U1 is connected to one end of resistor R15 through resistor R5.

3. The power sensor circuit according to claim 2, characterized in that, The first signal modulation circuit further includes resistors R6, R7, and R8, capacitor C1, and operational amplifier chip U2. One end of resistor R6, the positive terminal of capacitor C1, and the inverting input of operational amplifier chip U2 are connected to resistor R5. The negative terminal of capacitor C1 is grounded. The other end of resistor R6 and the positive terminal of operational amplifier chip U2 are connected to an external voltage terminal VCC. The negative terminal of operational amplifier chip U2 is grounded. The non-inverting input of operational amplifier chip U2 is connected to one end of resistor R7 and one end of resistor R8. The other end of resistor R7 is connected to an external voltage terminal VCC. The other end of resistor R8 is grounded. The output terminal of operational amplifier chip U2 is connected to one end of resistor R15.

4. The power sensor circuit according to claim 3, characterized in that, The first signal modulation circuit also includes capacitor C2, capacitor C3, resistor R9, resistor R10, diode D4, operational amplifier chip U3, operational amplifier chip U4, and transistor Q1; The non-inverting input of operational amplifier chip U3 is connected to one end of resistor R10 and the non-inverting input of operational amplifier chip U2. The inverting input of operational amplifier chip U3 is connected to one end of resistor R9, the cathode of diode D4, and the anode of capacitor C2. The cathode of capacitor C2 is grounded. The anode of diode D4 is connected to the other end of resistor R9, the other end of resistor R10, the output terminal of operational amplifier chip U3, and the non-inverting input of operational amplifier chip U4. The inverting input and output terminal of operational amplifier chip U4 are connected to the cathode of capacitor C3. The base of transistor Q1 is connected to the output terminal of operational amplifier chip U2. The emitter of transistor Q1 is grounded. The collector of transistor Q1 is connected to the anode of capacitor C3 and then to one end of resistor R15.

5. The power sensor circuit according to claim 4, characterized in that, The first signal modulation circuit further includes resistors R11, R12, R13, and R14, capacitor C4, and transistor Q3. The collector of transistor Q1 is connected to the base of transistor Q2, the emitter of transistor Q2 is grounded, the collector of transistor Q2 is connected to one end of resistor R12, the other end of resistor R12 is connected to one end of resistor R11 and the base of transistor Q3, the other end of resistor R11 and the emitter of transistor Q3 are connected to an external voltage terminal VCC, the collector of transistor Q3 is connected to the positive terminal of capacitor C4, one end of resistor R13 and one end of resistor R14, the negative terminal of capacitor C4 and the other end of resistor R13 are grounded, and the other end of resistor R14 is connected to one end of resistor R15.

6. The power sensor circuit according to claim 1, characterized in that, The output terminal VOUT1 is connected to a second signal modulation circuit, which includes a capacitor C9, a diode D7, resistors R26, R27, R28, R29, R30, and an operational amplifier chip U6. The positive terminal of capacitor C9 is connected to the output terminal VOUT1. The negative terminal of capacitor C9 is connected to one end of resistor R26 and the inverting input of the operational amplifier chip. The non-inverting input of operational amplifier chip U6 is connected to one end of resistor R29 and one end of resistor R28. The other end of resistor R28 is connected to one end of resistor R27 and the positive terminal of diode D7. The other end of resistor R27 is connected to the external voltage terminal VCC. The other ends of resistor R26, resistor R29, and diode D7 are connected to ground. The positive terminal of operational amplifier chip U6 is connected to the external voltage terminal VCC. The negative terminal of operational amplifier chip U6 is grounded. The output terminal of operational amplifier chip U6 is connected to one end of resistor R30 to serve as the final output terminal. The other end of resistor R30 is connected to the external voltage terminal VCC.

7. A power sensor, characterized in that, include: shell; The first circuit board is disposed on the inner side of the housing; The first magnetic ring is disposed inside the outer shell; A copper plate is disposed inside the outer casing and located above the first magnetic ring; The second circuit board is disposed on the upper end face of the copper plate; The second magnetic ring is connected to the second circuit board; The connecting wire has one end connected to the first circuit board and the other end passing through the first magnetic ring and extending outward through the outer shell; The power sensor circuit according to any one of claims 1 to 6, wherein a portion is disposed on the first circuit board and another portion is disposed on the second circuit board; The first circuit board is connected to the second circuit board via a connector, and the first magnetic ring... It is positioned perpendicular to the second magnetic ring.

8. The power sensor according to claim 7, characterized in that, The connecting wire includes a connector and a conductor wire. The connector passes through a bushing on one side of the housing. One end of the conductor wire is fixedly connected to the portion of the connector located inside the housing, and the other end passes through the first magnetic ring and extends outward through the housing.

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