阅读说明：本技术 一种感应式传感器激励信号产生方法 (Method for generating excitation signal of inductive sensor ) 是由 石洪 高文政 程亚博 崔小强 王德才 穆如传 章帆 周柏 王磊 沈孟龙 王柳 于 2021-09-15 设计创作，主要内容包括：一种感应式传感器激励信号产生方法,实现该方法的电路包括反向电路模块、自举升压电路模块、驱动电路模块LC谐振电路模块,反向电路模块用于将MCU输出的低压、高频的方波激励信号进行反向,生成四路相位差180°的控制信号,其中两路相位差180°的相位信号作为自举升压电路模块的输入信号,另外两路相位差180°的相位信号作为驱动电路模块的控制信号；自举升压电路模块用于将电压自举升高并作为驱动电路模块的驱动电压,驱动电路在两路相位差180°的控制信号及驱动电压作用下,生成两路高压、高频的方波信号,高压方波信号经过两路LC谐振电路生成两路高频、高压的差分正弦信号。该方法可以减少脉诊气息磁场中的高次谐波,提升抗干扰能力和测角精度。(A method for generating an excitation signal of an induction type sensor comprises a reverse circuit module, a bootstrap booster circuit module and a drive circuit module LC resonance circuit module, wherein the reverse circuit module is used for reversing low-voltage and high-frequency square wave excitation signals output by an MCU (microprogrammed control Unit) to generate four paths of control signals with 180-degree phase difference, two paths of phase signals with 180-degree phase difference are used as input signals of the bootstrap booster circuit module, and the other two paths of phase signals with 180-degree phase difference are used as control signals of the drive circuit module; the bootstrap booster circuit module is used for boosting voltage in a bootstrap mode and using the boosted voltage as driving voltage of the driving circuit module, the driving circuit generates two paths of high-voltage and high-frequency square wave signals under the action of two paths of control signals with phase difference of 180 degrees and the driving voltage, and the high-voltage square wave signals generate two paths of high-frequency and high-voltage differential sinusoidal signals through two paths of LC resonance circuits. The method can reduce higher harmonics in the pulse-taking breath magnetic field, and improve the anti-interference capability and the angle measurement precision.)

1. A method of generating an excitation signal for an inductive transducer, comprising: the circuit for realizing the method comprises a reverse circuit module, a bootstrap booster circuit module, a driving circuit module and an LC resonance circuit module;

the reverse circuit module is used for reversing the low-voltage and high-frequency square wave excitation signals output by the MCU to generate four paths of control signals with phase difference of 180 degrees, wherein two paths of phase signals with phase difference of 180 degrees are used as input signals of the bootstrap booster circuit module, and the other two paths of phase signals with phase difference of 180 degrees are used as control signals of the driving circuit module;

the bootstrap booster circuit module is used for boosting voltage in a bootstrap mode and using the boosted voltage as driving voltage of the driving circuit module, the driving circuit generates two paths of high-voltage and high-frequency square wave signals under the action of two paths of control signals with phase difference of 180 degrees and the driving voltage, and the high-voltage square wave signals generate two paths of high-frequency and high-voltage differential sinusoidal signals through two paths of LC resonance circuits.

2. The method of generating an inductive sensor excitation signal according to claim 1, wherein: the inversion circuit module comprises a first inversion circuit and a second inversion circuit, wherein the first inversion circuit comprises inverters U1 and U2, the second inversion circuit comprises inverters U3 and U4, the inverters U1 and U2 are connected in series, the inverters U3 and U4 are connected in series, and the input end of the inverter U1 is connected with the input end of the inverter U3;

the first reverse circuit is used for receiving a low-voltage and high-frequency square wave excitation signal generated by the MCU, reversing the square wave excitation signal and generating two paths of signals with phase difference of 180 degrees and supplying the signals to the bootstrap booster circuit module;

the second reverse circuit is used for receiving the low-voltage and high-frequency square wave excitation signals generated by the MCU for reversing, generating two paths of signals with 180-degree phase difference and supplying the two paths of signals to the driving circuit module.

3. The method of generating an inductive sensor excitation signal according to claim 2, wherein: the bootstrap booster circuit module comprises diodes Q1, Q2, Q3, Q4, Q5 and capacitors C1, C2, C3, C4, C5,

the diodes Q1, Q2, Q3, Q4 and Q5 are sequentially connected in series, the input end of Q1 is connected with the output end of U2, one end of a capacitor C1 is connected with the input end of U2, one end of the capacitor C1 is connected with the output end of Q1, one end of a capacitor C2 is connected with the input end of U2, one end of the capacitor C3 is connected with the output end of U2, one end of the capacitor C4 is connected with the output end of Q2, one end of the capacitor C4 is connected with the output end of U2, one end of the capacitor C5 is connected with the ground, and one end of the capacitor C5 is connected with the output end of Q5;

the bootstrap boost circuit module is used for converting a low-voltage square wave signal output by the first inverter circuit into a high-voltage direct-current level through bootstrap.

4. The method of generating an inductive sensor excitation signal according to claim 3, wherein: the driving circuit comprises a first driving circuit and a second driving circuit, the first driving circuit comprises a PMOS transistor Q6 and an NMOS transistor Q7, and the second driving circuit comprises a PMOS transistor Q8 and an NMOS transistor Q9;

wherein the S pole of Q6 is connected with the output terminal of Q5, the G pole of Q6 is connected with the output terminal of U4, the D pole of Q6 is connected with the D pole of Q7, the D pole of Q7 is connected with the D pole of Q6, the G pole of Q7 is connected with the output terminal of U4, the S pole of Q7 is connected with ground, the S pole of Q8 is connected with the output terminal of Q5, the G pole of Q8 is connected with the output terminal of U3, the D pole of Q8 is connected with the D pole of Q9, the D pole of Q9 is connected with the D pole of Q8, the G pole of Q9 is connected with the output terminal of U3, and the S pole of Q9 is connected with ground;

the first driving circuit and the second driving circuit respectively produce two paths of high-voltage square wave signals with the phase difference of 180 degrees under the action of two paths of control signals output by the second reverse circuit and driving voltage output by the bootstrap circuit.

5. The method of generating an inductive sensor excitation signal according to claim 4, wherein: the LC resonance circuit comprises a first resonance circuit and a second resonance circuit, the first resonance circuit comprises an inductor L1 and a capacitor C6, and the second resonance circuit comprises an inductor L2 and a capacitor C7;

one end of an inductor L1 is connected with the C6 in series, the other end of the inductor L1 is connected with the D pole of the Q6, one end of the inductor L2 is connected with the C7 in series, the other end of the inductor L2 is connected with the D pole of the Q8, one end of a capacitor C6 is connected with the inductor L1, the other end of the capacitor C6 is grounded, one end of a capacitor C7 is connected with the inductor L2, and the other end of the capacitor C7 is grounded;

the resonant frequency of the first resonant circuit and the resonant frequency of the second resonant circuit are consistent with the frequency of the excitation signal, and the square wave signals output by the driving circuit are converted into sinusoidal signals with the phase difference of 180 degrees through the action of the first resonant circuit and the second resonant circuit.

6. The method of generating an inductive sensor excitation signal according to claim 5, wherein: in the method, a chip integrating a plurality of inverters is used to replace the inverters U1, U2, U3 and U4 in the inverter reverse circuit;

the chip integrating the multipath diodes is used for replacing diodes Q1-Q5 in the bootstrap booster circuit, and meanwhile, when the chip is used for replacing the diodes Q1-Q5, the number of capacitors C1-C5 is adjusted to be matched with the number of the diodes contained in the chip, and the final boosting size of the bootstrap circuit is adjusted;

the chips integrating multiple MOS tubes are used for replacing the MOS tubes Q6, Q7, Q8 and Q9 in the LC resonant circuit.

Technical Field

The invention relates to the technical field of signal simulation and test, in particular to a method for generating an excitation signal of an induction type sensor.

Background

The induction type angle sensor needs a high-frequency excitation signal to generate a pulse-taking breath magnetic field when angle measurement is carried out, the pulse-taking breath magnetic field is limited by the size of the induction type angle sensor and the size of power supply voltage, the existing excitation signal is generally a single-end low-voltage high-frequency square wave signal, but due to the existence of an eddy current effect, the pulse-taking breath magnetic field is low in strength caused by the adoption of the single-end low-voltage excitation signal, the anti-interference capability of the induction type angle sensor is low, meanwhile, more higher harmonics are caused to exist in the pulse-taking breath magnetic field caused by the adoption of the square wave as the excitation signal, and the final angle measurement precision of the induction type angle sensor is low.

Disclosure of Invention

The invention aims to solve the technical problem of the prior art and provides a method for generating an excitation signal of an induction type sensor by combining a reversing circuit, a bootstrap booster circuit, a drive circuit and an LC resonance circuit.

The technical problem to be solved by the present invention is achieved by the following technical means. The invention relates to a method for generating an excitation signal of an induction type sensor, wherein a circuit for realizing the method comprises a reverse circuit module, a bootstrap booster circuit module, a driving circuit module and an LC resonance circuit module;

the reverse circuit module is used for reversing the low-voltage and high-frequency square wave excitation signals output by the MCU to generate four paths of control signals with phase difference of 180 degrees, wherein two paths of phase signals with phase difference of 180 degrees are used as input signals of the bootstrap booster circuit module, and the other two paths of phase signals with phase difference of 180 degrees are used as control signals of the driving circuit module;

the bootstrap booster circuit module is used for boosting voltage in a bootstrap mode and using the boosted voltage as driving voltage of the driving circuit module, the driving circuit generates two paths of high-voltage and high-frequency square wave signals under the action of two paths of control signals with phase difference of 180 degrees and the driving voltage, and the high-voltage square wave signals generate two paths of high-frequency and high-voltage differential sinusoidal signals through two paths of LC resonance circuits.

The technical problem to be solved by the present invention can be further solved by the following technical solutions, in the above method for generating an excitation signal of an inductive sensor, the inverter module includes a first inverter circuit and a second inverter circuit, the first inverter circuit includes inverters U1 and U2, the second inverter circuit includes inverters U3 and U4, the inverters U1 and U2 are connected in series, the inverters U3 and U4 are connected in series, and an input terminal of the inverter U1 is connected to an input terminal of the inverter U3;

the first reverse circuit is used for receiving a low-voltage and high-frequency square wave excitation signal generated by the MCU, reversing the square wave excitation signal and generating two paths of signals with phase difference of 180 degrees and supplying the signals to the bootstrap booster circuit module;

the second reverse circuit is used for receiving the low-voltage and high-frequency square wave excitation signals generated by the MCU for reversing, generating two paths of signals with 180-degree phase difference and supplying the two paths of signals to the driving circuit module.

The technical problem to be solved by the present invention can be further solved by the following technical solution, in the above method for generating an excitation signal of an inductive sensor, the bootstrap step-up circuit module includes diodes Q1, Q2, Q3, Q4, Q5, capacitors C1, C2, C3, C4, and C5,

the diodes Q1, Q2, Q3, Q4 and Q5 are sequentially connected in series, the input end of Q1 is connected with the output end of U2, one end of a capacitor C1 is connected with the input end of U2, one end of the capacitor C1 is connected with the output end of Q1, one end of a capacitor C2 is connected with the input end of U2, one end of the capacitor C3 is connected with the output end of U2, one end of the capacitor C4 is connected with the output end of Q2, one end of the capacitor C4 is connected with the output end of U2, one end of the capacitor C5 is connected with the ground, and one end of the capacitor C5 is connected with the output end of Q5;

the bootstrap boost circuit module is used for converting a low-voltage square wave signal output by the first inverter circuit into a high-voltage direct-current level through bootstrap.

The technical problem to be solved by the present invention can be further solved by the following technical solutions, in the above method for generating the excitation signal of the inductive sensor, the driving circuit includes a first driving circuit and a second driving circuit, the first driving circuit includes a PMOS transistor Q6 and an NMOS transistor Q7, the second driving circuit includes a PMOS transistor Q8 and an NMOS transistor Q9;

wherein the S pole of Q6 is connected with the output terminal of Q5, the G pole of Q6 is connected with the output terminal of U4, the D pole of Q6 is connected with the D pole of Q7, the D pole of Q7 is connected with the D pole of Q6, the G pole of Q7 is connected with the output terminal of U4, the S pole of Q7 is connected with ground, the S pole of Q8 is connected with the output terminal of Q5, the G pole of Q8 is connected with the output terminal of U3, the D pole of Q8 is connected with the D pole of Q9, the D pole of Q9 is connected with the D pole of Q8, the G pole of Q9 is connected with the output terminal of U3, and the S pole of Q9 is connected with ground;

the first driving circuit and the second driving circuit respectively produce two paths of high-voltage square wave signals with the phase difference of 180 degrees under the action of two paths of control signals output by the second reverse circuit and driving voltage output by the bootstrap circuit.

The technical problem to be solved by the present invention can be further solved by the following technical solutions, in the above method for generating an excitation signal of an inductive sensor, the LC resonant circuit includes a first resonant circuit and a second resonant circuit, the first resonant circuit includes an inductor L1 and a capacitor C6, and the second resonant circuit includes an inductor L2 and a capacitor C7;

one end of an inductor L1 is connected with the C6 in series, the other end of the inductor L1 is connected with the D pole of the Q6, one end of the inductor L2 is connected with the C7 in series, the other end of the inductor L2 is connected with the D pole of the Q8, one end of a capacitor C6 is connected with the inductor L1, the other end of the capacitor C6 is grounded, one end of a capacitor C7 is connected with the inductor L2, and the other end of the capacitor C7 is grounded;

the resonant frequency of the first resonant circuit and the resonant frequency of the second resonant circuit are consistent with the frequency of the excitation signal, and the square wave signals output by the driving circuit are converted into sinusoidal signals with the phase difference of 180 degrees through the action of the first resonant circuit and the second resonant circuit.

The technical problem to be solved by the present invention can be further solved by the following technical solution, wherein for the above-mentioned method for generating an excitation signal of an inductive sensor, a chip integrated with a plurality of inverters is used to replace the inverters U1, U2, U3 and U4 in the inverter inverting circuit;

the chip integrating the multipath diodes is used for replacing diodes Q1-Q5 in the bootstrap booster circuit, and meanwhile, when the chip is used for replacing the diodes Q1-Q5, the number of capacitors C1-C5 is adjusted to be matched with the number of the diodes contained in the chip, and the final boosting size of the bootstrap circuit is adjusted;

the chips integrating multiple MOS tubes are used for replacing the MOS tubes Q6, Q7, Q8 and Q9 in the LC resonant circuit.

Compared with the prior art, the invention has the beneficial effects that:

(1) according to the pulse-taking breath magnetic field sensor, a reverse circuit and a bootstrap booster circuit are adopted to convert a single-ended low-voltage excitation signal into a differential high-voltage excitation signal, so that the strength of the pulse-taking breath magnetic field is improved, and the anti-interference capacity of the induction type angle sensor is improved;

(2) according to the pulse-taking breath magnetic field sensor, the square wave excitation signal is converted into the sine wave excitation signal by the LC resonance circuit, so that higher harmonics in the pulse-taking breath magnetic field are reduced, and the angle measurement precision of the sensor is improved;

(3) by adopting the technology of the invention, the induction type angle sensor uses low voltage as power supply voltage, and the power supply voltage does not need to be changed;

(4) the invention has simple structure and small occupied space, and does not need to increase the volume of the induction type angle sensor.

Drawings

FIG. 1 is a schematic block diagram of the overall circuit configuration of the present invention;

FIG. 2 is a waveform diagram of the input and output of the reverse driving circuit according to the present invention;

FIG. 3 is a voltage waveform diagram of various points of the bootstrap booster circuit of the present invention;

FIG. 4 is a waveform diagram of the input and output of the LC resonant circuit of the present invention;

FIG. 5 is a schematic block diagram of the present invention built using integrated chips.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Embodiment 1, with reference to fig. 1-4, a method of generating an excitation signal for an inductive angle sensor, the method utilizing an excitation signal generating circuit comprising the following four modules: the circuit comprises an inverter circuit module 11, a bootstrap booster circuit module 12, a driving circuit module 13 and an LC resonance circuit module 14;

the inverter circuit module 11 comprises a first inverter circuit and a second inverter circuit, wherein the first inverter circuit comprises inverters U1 and U2, the second inverter circuit comprises U3 and U4, U1 is connected with U2 in series, U3 is connected with U4 in series, and U1 is connected with an input end of U3;

the first reverse circuit receives 4V and 1MHz square wave excitation signals generated by the MCU for reversing to generate two paths of signals with 180-degree phase difference and supplies the two paths of signals to the bootstrap booster circuit module, and the second reverse circuit receives low-voltage and high-frequency square wave excitation signals generated by the MCU for reversing to generate two paths of signals with 180-degree phase difference and supplies the two paths of signals to the driving circuit module;

the bootstrap boost circuit comprises diodes Q1, Q2, Q3, Q4, Q5 and capacitors C1, C2 and C2, wherein the diodes Q2, Q2 and Q2 are sequentially connected in series, the input end of the Q2 is connected with the output end of the U2, one end of the capacitor C2 is connected with the input end of the U2, one end of the capacitor C2 is connected with the output end of the Q2, one end of the capacitor C2 is connected with the input end of the U2, one end of the capacitor C2 is connected with the output end of the U2, one end of the capacitor C2 is connected with the ground, and one end of the capacitor C2 is connected with the output end of the Q2;

the working process of the bootstrap booster circuit is as follows: after electrification, when the point A is high level for the first time and the point B is low level, the point A charges capacitors C1 and C2 through diodes Q1, Q2 and Q3 to enable the voltage at the point C, E to be 4V, then the voltage is output through Q4 and Q5, and the voltage at the point G is 4V; when the point A is at a negative level for the first time and the point B is at a high level, the point B and the capacitor C1 charge the capacitor C3 through the diode Q2, so that the voltage at the point D is 8V; the point B and the capacitor C2 charge the capacitor C4 through the diode Q4, the voltage at the point F is 8V, and then the voltage is output through the diode Q5, and the voltage at the point G is 8V. When the point A is high level for the second time and the point B is low level, the point A and the capacitor C3 charge the capacitor C2 through the diode Q3, so that the voltage of the point E is 12V, the point A and the capacitor C4 are output through the diode Q5, and the point G outputs 12V voltage; when the point A is at the negative level for the second time and the point B is at the high level, the point B and the capacitor C2 charge the capacitor C4 through the diode Q4, so that the voltage at the point F is 16V, then the voltage is output through the Q5, and the voltage of the point G is 16V; when the point A is high for the third time and the point B is low, the point A and the capacitor C4 are output through the diode Q5, and the point G outputs 20V voltage; then, according to the high level and the low level of the square wave signals at the point A and the point B, the point G outputs 20V voltage and 16V voltage; when the 4 th waveform signal is output by the square wave signals at the point A and the point B, the output waveform at the position C, D, E, F, G is stable; g point outputs square wave signals with high level of 20V and low level of 16V, and the square wave signals are filtered by a capacitor C5 to output 16V direct current voltage, so that the voltage boosting from 4V voltage to 16V voltage is realized;

the driving circuit comprises a first driving circuit and a second driving circuit, wherein the first driving circuit comprises a PMOS tube Q6 and an NMOS tube Q7, the second driving circuit comprises a PMOS tube Q8 and an NMOS tube Q9, the S pole of Q6 is connected with the output end of Q5, the G pole of Q6 is connected with the output end of U4, the D pole of Q6 is connected with the D pole of Q7, the D pole of Q7 is connected with the D pole of Q6, the G pole of Q7 is connected with the output end of U4, the S pole of Q7 is connected with ground, the S pole of Q8 is connected with the output end of Q5, the G pole of Q8 is connected with the output end of U3, the D pole of Q8 is connected with the D pole of Q9, the D pole of Q9 is connected with the D pole of Q8, the G pole of Q9 is connected with the output end of U3, and the S pole of Q9 is connected with ground;

the working process of the first driving circuit is as follows: when the square wave output by the U4 is at a low level, the PMOS tube Q6 is switched on, the NMOS tube Q7 is switched off, and at the moment, the first driving circuit outputs a 16V high level; when the square wave output by the U4 is at a high level, the NMOS transistor N7 is switched on, the PMOS transistor Q6 is switched off, and at the moment, the first driving circuit outputs a 0V level;

the second driving circuit works in a similar principle to the first driving circuit;

the LC resonance circuit comprises a first resonance circuit and a second resonance circuit, wherein the first resonance circuit comprises an inductor L1 and a capacitor C6, the second resonance circuit comprises an inductor L2 and a capacitor C7, one end of the inductor L1 is connected with the C6 in series, the other end of the inductor L1 is connected with the D pole of the Q6, one end of the inductor L2 is connected with the C7 in series, the other end of the inductor L2 is connected with the D pole of the Q8, one end of the capacitor C6 is connected with the inductor L1, the other end of the capacitor C6 is grounded, one end of the capacitor C7 is connected with the inductor L2, and the other end of the capacitor C7 is grounded;

the resonance frequency of the first resonance circuit and the second resonance circuit is consistent with the square wave excitation signal, the Q values of the first resonance circuit and the second resonance circuit are also consistent, the square wave can be decomposed into sine waves with the same frequency and higher harmonics thereof according to Fourier decomposition, and the 16V square wave signal and the 1MHz square wave signal output by the driving circuit pass through the resonance circuit and output a difference sine signal which is amplified by Q times and 1MHz according to the amplification and frequency selection effects of LC series resonance.

Example 2, with reference to FIG. 5, the inverters U1-U4 in the inverter circuit module can be replaced by a chip incorporating a multi-way inverter, such as chip N1 including but not limited to an integrated four-way inverter; n1 reverses the 4V and 1MHz square wave excitation signals output by the MCU to generate four paths of control signals with 180-degree phase difference;

the diodes Q1-Q5 in the bootstrap booster circuit can be replaced by chips of integrated multi-path diodes, and meanwhile, when the integrated chips replace the diodes Q1-Q5, the number of the capacitors C1-C5 can be adjusted according to the number of the diodes contained in the chips so as to adjust the final boost size of the bootstrap circuit, for example, N2 including but not limited to integrated four-path diodes is used for replacing the diodes Q1-Q5, and at the moment, 4V and 1MHz square waves output by the N1 are amplified to generate 12V direct current voltage;

MOS tubes Q6, Q7, Q8 and Q9 in the driving circuit can be replaced by chips of integrated multi-path MOS tubes, for example, N3 and N4 including but not limited to integrated PMOS and NMOS are used for replacing MOS tubes Q6-Q9, at the moment, N3 and N4 produce square wave signals of 12V and 1MHz under the action of square wave control signals of 4V and 1MHz output by N1 and 12V driving voltage output by N2, and the square wave signals pass through an LC resonance circuit module to output high-voltage differential sinusoidal signals of 1 MHz.