Rotary transformer analog circuit based on multiplication principle

Abstract

The utility model discloses a rotary transformer analog circuit based on a multiplication principle. The analog circuit comprises an excitation signal modulation circuit, a DAC modulation circuit, a signal processing circuit, a multiplication circuit, an analog COS signal output circuit and an analog SIN signal output circuit. The output end of the excitation signal modulation circuit is connected with the input end of the multiplication circuit; the output end of the STM32 single-chip microcomputer is connected with the input end of the DAC modulation circuit. The multiplication circuit multiplies a signal output by the DAC modulation circuit and an excitation signal modulation circuit output signal for inputting an excitation signal to generate a sine and cosine signal, the input end of the multiplication circuit is connected with the excitation signal modulation circuit and the DAC modulation circuit, and the output end of the multiplication circuit is connected with the analog COS signal output circuit and the analog SIN signal output circuit; the analog COS signal output circuit and the analog SIN signal output circuit output analog COS signals and analog SIN signals, and the output end of the analog COS signal output circuit and the output end of the analog SIN signal output circuit are connected with the controller.

Description

TECHNICAL FIELD

[0001] The utility model relates to a rotary transformer analog circuit technical field especially relates to a kind of rotary transformer analog circuit based on multiplication principle. BACKGROUND

[0002] With the wide application of high-performance motor drive system in electric vehicles, traction locomotive, wind power generation and aviation power fields, higher requirements are put forward for the performance test of motor and controller. Engineers and researchers urgently need effective tools to test, analyze motor system characteristics, response performance and control strategy, so the related motor simulator is crucial. When testing the performance of motor, if all real objects are used for testing, it will cause long development cycle, high cost and poor experimental repeatability. In order to overcome these shortcomings, semi-physical real-time simulation system is used at home and abroad at present, especially hardware-in-the-loop real-time simulation technology (HIL), which simulates motor system characteristics through power electronic devices, connects with real control system, tests the feasibility of control system and the effectiveness of control strategy, shortens the development cycle of control strategy, reduces the development cost, and improves the experimental repeatability.

[0003] Rotary transformer is a kind of electrical equipment for measuring rotation angle, angular velocity and its change. The working principle of rotary transformer is to generate an alternating magnetic field through the main stator winding, and then induce a voltage signal related to rotation angle in the auxiliary stator winding. The change of rotation angle will cause the change of amplitude and phase of induced signal, so as to realize accurate measurement of angle.

[0004] In order to realize the closed-loop control simulation of motor simulator, the rotor of rotary transformer cannot be driven to rotate synchronously in the motor simulation system without actual rotating shaft, so the real rotary transformer cannot be used to measure angle. It is necessary to simulate the real rotary transformer by using power electronic devices to realize efficient and accurate test, and to measure the rotation angle of motor by building simulation circuit to simulate the output characteristics of rotary transformer. UTILITY MODEL CONTENTS

[0005] In view of the above technical problems to be solved, the utility model provides a kind of rotary transformer analog circuit based on multiplication principle, simulates the real rotary transformer by using power electronic devices, realizes efficient and accurate test, and measures the rotation angle of motor by building simulation circuit to simulate the output characteristics of rotary transformer.

[0006] To solve the above technical problems, the technical scheme provided by the utility model is:

[0007] The application discloses a resolver analog circuit based on a multiplication principle, which comprises an excitation signal modulation circuit, a DAC modulation circuit, a signal processing circuit, a multiplication circuit, an analog COS signal output circuit and an analog SIN signal output circuit; the output end of the excitation signal modulation circuit is connected with the input end of the multiplication circuit; the output end of an STM32 single-chip microcomputer is connected with the input end of the DAC modulation circuit; the DAC modulation circuit is used for modulating the positive and negative cosine PWM digital signals generated by the STM32 single-chip microcomputer, and then the signals are processed by the signal processing circuit and output to be connected with the input end of the multiplication circuit; the multiplication circuit multiplies the signals output by the DAC modulation circuit with the signals output by the excitation signal modulation circuit of the input excitation signal to generate positive and negative cosine signals; the input end of the multiplication circuit is connected with the excitation signal modulation circuit and the DAC modulation circuit; the output end of the multiplication circuit is connected with the analog COS signal output circuit and the analog SIN signal output circuit; the analog COS signal output circuit and the analog SIN signal output circuit output analog COS signals and analog SIN signals; and the output ends of the analog COS signal output circuit and the analog SIN signal output circuit are connected with a controller.

[0008] As a further improvement of the above technical solution, the application provides the following technical scheme:

[0009] Preferably, in the resolver analog circuit, the excitation signal is EXC=A0sin(ωt), the signal output by the excitation signal modulation circuit is EXC'=A0sin(ωt), the positive and negative cosine modulation signals generated by the positive and negative cosine PWM digital signals after being processed by the DAC modulation circuit and the signal processing circuit are COS'=Tcos(θ) and SIN'=Tsin(θ) respectively; the output signals of the DAC modulation circuit and the excitation signal modulation circuit are multiplied in the multiplication circuit, and then single-ended to differential processing is performed to generate analog positive and negative cosine signals, wherein the analog COS signal is COS=A0Tcos(θ)sin(ωt), and the analog SIN signal is SIN=A0Tsin(θ)sin(ωt).

[0010] Preferably, the signal processing circuit comprises a signal modulation circuit and a signal circuit.

[0011] Preferably, the excitation signal modulation circuit comprises a differential to single-ended chip U2, resistors R2, R5, R6, R7, R15, R17, R19, R22, R23, capacitors C6, C7 and a tantalum capacitor C4; one end of the resistor R7 is connected with an excitation excitation signal EXC+, and the other end of the resistor R7 is grounded; one end of the resistor R15 is connected with an excitation excitation signal EXC-, and the other end of the resistor R15 is grounded; the positive input end of the differential to single-ended chip U2 is connected with the excitation excitation signal EXC+ and the excitation excitation signal EXC-; the negative input end of the differential to single-ended chip U2 is connected with the excitation excitation signal EXC+ and the excitation excitation signal EXC-; the output end of the differential to single-ended chip U2 is connected with the resistor R2, the resistor R5, the resistor R6, the resistor R7, the resistor R15, the resistor R17, the resistor R19, the resistor R22, the resistor R23, the capacitor C6, the capacitor C7 and the tantalum capacitor C4. #Pin connected with excitation signal EXC+ after series resistance R5, positive input end 9 of differential to single-ended chip U2 # Pin connected with excitation signal EXC+ after series resistance R2, 8 of differential to single-ended chip U2 # Pin grounded, 7 of differential to single-ended chip U2 # Pin left floating, reverse output end 6 of differential to single-ended chip U2 # Pin grounded after series resistance R6, reverse input end 1 of differential to single-ended chip U2 # Pin connected with excitation signal EXC- after series resistance R17, reverse input end 2 of differential to single-ended chip U2 # Pin connected with excitation signal EXC- after series resistance R22, 3 of differential to single-ended chip U2 # Pin connected circuit is divided into two branches, one branch is connected with +5V power voltage, and the other branch is grounded after passing through parallelly arranged capacitor C7 and tantalum capacitor C4; 4 of differential to single-ended chip U2 # Pin connected circuit is divided into three branches, one branch is connected with +5V power voltage after series resistance R19, one branch is grounded after series resistance R23, and the other branch is grounded after series capacitor C6; positive output end 5 of differential to single-ended chip U2 # Pin outputs single-ended excitation signal EXC′+ after modulation.

[0012] Preferably, the DAC modulation circuit comprises chip U10, DAC chip U11, resistance R44, resistance R45, resistance R46, resistance R47; input end 1 of the chip U10 is connected with the SPI_MOSI signal of the STM32 single-chip microcomputer # Pin connected with SPI_MOSI signal of the STM32 single-chip microcomputer, output end 2 of chip U10 # Pin outputs MOSI_DAC signal, input end 3 of chip U10 # Pin connected with SPI_CLK signal of the STM32 single-chip microcomputer, output end 4 of chip U10 # Pin outputs CLK_DAC signal, input end 5 of chip U10 # Pin connected with SPI_CS signal of the STM32 single-chip microcomputer, output end 6 of chip U10 # Pin outputs CS_DAC signal, 7 of chip U10 # Pin grounded, output end 8 of chip U10 # Pin outputs LOAD_DAC signal and connected with +5V voltage after series resistance R44, 14# pin of chip U10 is connected with +5V power voltage, 9# pin, 10# pin, 11# pin, 12# pin, 13# pin of the chip U10 are left floating; 1 of the DAC chip U11 is connected with the SPI_MOSI signal of the STM32 single-chip microcomputer #Pin connects +5V power voltage, input end 2 of the DAC chip U11 # Pin connects the output signal CS_DAC of the chip U10 and is connected with +5V voltage after connecting with resistance R46 in series, input end 3 of the DAC chip U11 # Pin connects the output signal CLK_DAC of the chip U10 and is connected with +5V voltage after connecting with resistance R45 in series, input end 4 of the DAC chip U11 # Pin connects the output signal MOSI_DAC of the chip U10 and is connected with +5V voltage after connecting with resistance R47 in series, input end 5 of the DAC chip U11 # Pin connects the output signal LOAD_DAC of the chip U10, 7 of the DAC chip U11 # Pin connects ground, output end 6 of the DAC chip U11 # Pin outputs DAC_S signal, output end 8 of the DAC chip U11 # Pin outputs DAC_C signal.

[0013] Preferably, the signal modulation circuit comprises chip U7, chip U8, chip U12.1, resistance R30, resistance R32, resistance R35, resistance R36, resistance R38, resistance R39, resistance R42, resistance R43, capacitor C10, capacitor C12, capacitor C14, capacitor C15; 2 of the chip U7 is connected with the output signal DAC_S of the chip U11 after connecting with resistance R30 in series, # Pin connects the circuit into two branches, one branch 6 of the chip U7 is connected with the output signal DAC_S of the chip U11 after connecting with resistance R30 in series, # Pin connects, and the other branch is connected with 3 of the chip U12.1 after connecting with resistance R35 in series; # Pin connects; 3 of the chip U7 is connected with the output signal DAC_C of the chip U11 after connecting with resistance R32 in series, # Pin connects the circuit into two branches, one branch is connected with the output signal DAC_C of the chip U11 after connecting with resistance R32 in series, and the other branch is grounded after connecting with capacitor C12 in series; 4 of the chip U7 # Pin connects ground, 7 of the chip U7 # Pin connects +5V power voltage, 1 of the chip U7 # Pin, 5 # Pin, 8 # Pin is left floating; 2 of the chip U8 # Pin connects the circuit into three branches, one branch 6 of the chip U8 is connected with 2 of the chip U12.1 after connecting with resistance R36 in series, # Pin connects, one branch is connected with 2 of the chip U12.1 after connecting with resistance R36 in series, # Pin connects, and the other branch is grounded after connecting with resistance R38 in series; 3 of the chip U8 #The circuit splits into two branches after being connected in series with resistor R39. One branch is connected in series with resistor R43 and then to a +3.3V power supply. The other branch is connected in parallel with resistor R42 and capacitor C14 and then grounded. The 4th pin of chip U8... # Pin grounded, chip U8's 7 # Pin 1 is connected to a +5V power supply. # pin, 5 # pins, 8 # The pin is left floating; pin 1 of the chip U12.1 # The pin is connected to the 3rd pin of chip U12.1 via a resistor R30 and a capacitor C10 connected in parallel. # Pin connections, and chip U12.1's 1 # The pin outputs the modulated DAC signal DAC_COS, which is used to output to the multiplication module; the 4 pins of the chip U12.1 # The pin is connected to a +5V power supply, and the +5V power supply is connected in series with capacitor C15 and then grounded; the 8 pins of the chip U12.1 # The pin is connected to a -5V power supply voltage.

[0014] Preferably, the signal circuit includes chips U6, U9, U12.2, resistors R28, R29, R31, R33, R34, R37, R40, R41, capacitors C11, C13, and C16; the two-phase circuit of chip U6... # The circuit connected to the pins is divided into two branches, one of which connects to the 6 pins of chip U6. # The pin connections are as follows: another series resistor R34 is connected to pin 6 of chip U12.2. # Pin connections; the 3rd pin of the chip U6 # The pin is connected in series with resistor R31 and then splits into two branches. One branch is connected in series with resistor R28 and then to the +3.3V power supply voltage. The other branch is connected in parallel with resistor R29 and capacitor C11 and then grounded. The 4 pins of chip U6... # Pin grounded, chip U6's 7 # Pin 1 is connected to a +5V power supply. # pin, 5 # pins, 8 # Pin floating; pin 2 of chip U9 # The circuit connected to the pins is divided into two branches, one of which is connected to the 6 pins of the chip U9. # The pin connections are as follows: another series resistor R37 is connected to the 5 pin of chip U12.2. # Pin connections; the 3rd pin of the chip U9 #The pin is connected with two branches of circuit, one branch is connected with the output signal DAC_S of the chip U11 after series connection of the resistance R40, and the other branch is connected with the ground after series connection of the capacitor C12; the pin 4 # The pin is grounded, and the pin 7 of the chip U9 is connected with the ground # The pin is connected with +5V power voltage, and the pin 1 of the chip U9 is connected with +5V power voltage # The pin 5 of the chip U9 is connected with the ground # The pin 8 of the chip U9 is connected with the ground # The pin is left floating; the pin 5 of the chip U12.2 is connected with the ground # The pin is connected with two branches of circuit, one branch is connected with the pin 7 of the chip U12.2 after series connection of the resistance R41 and the capacitor C13 which are connected in parallel, and the other branch is connected with the ground after series connection of the resistance R37; the pin 7 of the chip U12.2 is connected with the ground # The pin 7 of the chip U12.2 is connected with the ground # The pin outputs the DAC signal DAC_SIN after modulation, and is used for outputting to the multiplication module; the pin 6 of the chip U12.2 is connected with the ground # The pin is connected with the ground after series connection of the resistance R33.

[0015] Preferably, the multiplication circuit comprises the chip U1, the chip U4, the resistance R3, the resistance R8, the resistance R13, the resistance R14, the resistance R16 and the resistance R20; the input end 1 of the chip U1 is connected with the DAC_SIN signal after signal processing circuit # The pin is connected with the DAC_SIN signal after signal processing circuit, and the input end 2 of the chip U1 is connected with the DAC_SIN signal after signal processing circuit # The pin is grounded, and the pin 3 of the chip U1 is grounded # The pin is connected with -5V voltage; the input end 4 of the chip U1 is connected with -5V voltage # The pin is connected with two branches of circuit, one branch is connected with the ground after series connection of the resistance R8, and the other branch is connected with the output end 5 of the chip U1 after series connection of the resistance R3 # The pin is connected with the output end 5 of the chip U1 # The pin outputs the analog sine signal SIN after processing of the multiplier; the pin 6 of the chip U1 is connected with the ground # The pin is connected with +5V power voltage; the input end 7 of the chip U1 is connected with +5V power voltage # The pin is connected with the ground after series connection of the resistance R14; the input end 7 of the chip U1 is connected with the ground after series connection of the resistance R14 # The pin is connected with the single-ended excitation signal EXC′+ after modulation of the chip U2 after series connection of the resistance R13; the input end 8 of the chip U1 is connected with the single-ended excitation signal EXC′+ after modulation of the chip U2 after series connection of the resistance R13 # The pin is grounded; the input end 1 of the chip U4 is grounded # The pin is connected with the DAC_COS signal after signal processing circuit, and the input end 2 of the chip U4 is connected with the DAC_COS signal after signal processing circuit # The pin is grounded, and the pin 3 of the chip U4 is grounded # The pin is connected with -5V voltage; the input end 4 of the chip U4 is connected with -5V voltage # The pin is connected with the ground after series connection of the resistance R20, and the pin 4 of the chip U4 is connected with the ground after series connection of the resistance R20 # The pin is connected with the output end 5 of the chip U4 after series connection of the resistance R16# Pin connects the output 5 of the chip U4 # Pin outputs the analog cosine signal COS processed by the multiplier; 6 of the chip U4 # Pin connects the +5V power voltage; input 7 of the chip U4 # Pin connects the series resistance R14 to the ground, input 7 of the chip U4 # Pin connects the series resistance R13 to the single-ended excitation signal EXC′+ modulated by the chip U2; input 8 of the chip U4 # Pin connects the ground.

[0016] Preferably, the analog SIN signal output circuit comprises a single-ended to differential chip U3, a pin seat terminal CN1, a resistance R1, a resistance R4, a resistance R9, a resistance R10, a resistance R11, a resistance R12, a tantalum capacitor C3, a capacitor C1, a capacitor C2; 1 of the chip U3 # Pin connects the series resistance R11 to the ground; 2 of the chip U3 # Pin connects the series resistance R12 to the ground; 3 of the chip U3 # Pin connects the circuit in two branches, one branch connects the +5V power voltage, and the other branch connects the capacitor C2 and the tantalum capacitor C3 in parallel to the ground; 4 of the chip U3 # Pin connects the capacitor C1 and the resistance R4 in parallel to the ground, and connects the +5V power voltage through the series resistance R1; 7 of the chip U3 # Pin is left floating; 8 of the chip U3 # Pin connects the ground; 9 of the chip U3 # Pin connects the output signal SIN from the chip U1 through the series resistance R9; 10 of the chip U3 # Pin connects the output signal SIN of the chip U1 through the series resistance R10; the positive output end 5 of the chip U3 # Pin outputs the analog sine signal SIN+ of the resolver simulator; the negative output end 6 of the chip U3 # Pin outputs the analog sine signal SIN- of the resolver simulator; the pin seat terminal CN1 connects the analog sine differential signal of the resolver simulator output by the chip U3.

[0017] Preferably, the analog COS signal output circuit comprises a chip U5, a pin seat terminal CN3, a resistance R18, a resistance R21, a resistance R24, a resistance R25, a resistance R26, a resistance R27, a tantalum capacitor C9, a capacitor C5, a capacitor C8; 1 of the chip U5 # Pin connects the series resistance R26 to the ground; 2 of the chip U5 # Pin connects the series resistance R27 to the ground; 3 of the chip U5 #The pin is connected with the capacitor C5 and the resistor R21 in parallel and then grounded and connected with the +5V power supply voltage through the resistor R18 in series; the 7th pin of the chip U5 # The pin is connected with the capacitor C5 and the resistor R21 in parallel and then grounded and connected with the +5V power supply voltage through the resistor R18 in series; the 7th pin of the chip U5 # The pin is left hanging; the 8th pin of the chip U5 # The pin is grounded; the 9th pin of the chip U5 # The pin is connected with the output signal COS from the chip U4 through the resistor R24 in series; the 10th pin of the chip U5 # The pin is connected with the output signal COS from the chip U4 through the resistor R25 in series; the positive output end 5 of the chip U5 # The pin outputs the analog cosine signal COS+ of the rotary transformer simulator; the negative output end 6 of the chip U5 # The pin outputs the analog cosine signal COS- of the rotary transformer simulator; the needle seat terminal CN3 is connected with the analog cosine differential signal of the rotary transformer simulator output by the chip U5.

[0018] Compared with the prior art, the rotary transformer simulation circuit based on the multiplication principle has the following advantages:

[0019] The rotary transformer simulation circuit based on the multiplication principle of the utility model does not need to collect the excitation signal through the traditional high-speed ADC, and is modulated by the DAC signal modulation circuit to the positive and sine PWM digital signals generated by the STM32 single-chip microcomputer, and finally the excitation signal and the positive and sine signals modulated by the DAC are multiplied through the multiplication circuit to generate the analog positive and sine signals. The rotary transformer simulation circuit of the utility model can save the high-speed ADC collection module, directly processes through the multiplication circuit, greatly reduces the cost, and transmits the positive and sine signals faster. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structure schematic view of the simulation circuit of the utility model.

[0021] Figure 2 It is an excitation signal modulation circuit diagram of the utility model.

[0022] Figure 3 It is a DAC modulation circuit diagram of the utility model.

[0023] Figure 4 It is a signal modulation circuit diagram of the utility model.

[0024] Figure 5 It is a signal circuit diagram of the utility model.

[0025] Figure 6 It is a multiplication circuit diagram of the utility model.

[0026] Figure 7 It is the analog COS signal output circuit diagram of the utility model.

[0027] Figure 8 It is the analog SIN signal output circuit diagram of the utility model. DETAILED DESCRIPTION

[0028] The specific embodiments described here are only used to illustrate and explain the utility model, and are not used to limit the utility model.

[0029] The utility model discloses a resolver analog circuit based on multiplication principle, include: excitation signal modulation circuit, DAC modulation circuit, signal processing circuit, multiplication circuit, analog COS signal output circuit, analog SIN signal output circuit.Signal processing circuit includes signal modulation circuit and signal circuit. Figure 1 As shown in the figure, the excitation signal is connected with the multiplication circuit input end through the output end of excitation signal modulation circuit, and the output end of STM32 singlechip is connected with the input end of DAC modulation circuit, and the DAC modulation circuit is modulated to the sine PWM digital signal generated by STM32 singlechip, and then the output after signal processing circuit processing is connected with the multiplication circuit input end.The multiplication circuit is used for generating the sine signal containing excitation signal, and the signal output by DAC modulation circuit is multiplied with the excitation signal modulation circuit output signal of input excitation signal to generate sine signal.The multiplication circuit input end is connected with excitation signal modulation circuit and DAC modulation circuit, and the multiplication circuit output end is connected with analog COS signal output circuit and analog SIN signal output circuit, and the analog COS signal output circuit and analog SIN signal output circuit output analog COS signal and analog SIN signal, and the output end of analog COS signal output circuit and analog SIN signal output circuit is connected with the controller.

[0030] In the resolver analog circuit, the excitation signal is EXC=A0 sin (ωt), the signal output by excitation signal modulation circuit is EXC'=A0 sin (ωt), the sine modulation signal generated after the sine PWM digital signal is processed through DAC modulation circuit and signal processing circuit is respectively COS'=Tcos (θ) and SIN'=Tsin (θ).The signal is multiplied in the multiplication circuit, and the output signal is processed to single-ended differential, and finally the analog sine signal of resolver simulator is generated.Analog COS signal is COS=A0Tcos (θ) sin (ωt), and analog SIN signal is SIN=A0Tsin (θ) sin (ωt).

[0031] As shown in the figure, Figure 2As shown, the excitation signal modulation circuit is a differential-to-single-ended circuit for input excitation signals. The differential-to-single-ended circuit includes a differential-to-single-ended chip U2, resistors R2, R5, R6, R7, R15, R17, R19, R22, R23, capacitors C6 and C7, and a tantalum capacitor C4. The differential-to-single-ended chip U2 uses an AD8475ARMZ. One end of resistor R7 is connected to the excitation signal EXC+, and the other end is grounded; one end of resistor R15 is connected to the excitation signal EXC-, and the other end is grounded; the positive input terminal 10 of the differential-to-single-ended chip U2... # The pin is connected in series with resistor R5 and then to the excitation signal EXC+, which is the positive input terminal 9 of the differential-to-single-ended chip U2. # The pin is connected in series with resistor R2 and then to the excitation signal EXC+, which is the 8 pin of the differential to single-ended chip U2. # Pin grounded, differential to single-ended chip U2's 7 # Pin 6 is left floating; the inverting output of differential-to-single-ended chip U2 is left floating. # The pin is connected in series with resistor R6 and then grounded. The inverting input of differential to single-ended converter U2 is pin 1. # The pin is connected in series with resistor R17 and then to the excitation signal EXC-, which is the inverting input of the differential-to-single-ended chip U2. # The pin is connected in series with resistor R22 and then to the excitation signal EXC-, which is the 3rd pin of the differential to single-ended chip U2. # The circuit connected to the pins is divided into two branches: one is connected to the +5V power supply voltage, and the other is grounded after passing through a parallel capacitor C7 and a tantalum capacitor C4; the differential to single-ended converter chip U2 has pin 4. # The circuit connected to the pins is divided into three branches: one is connected to the +5V power supply after series resistor R19, one is connected to ground after series resistor R23, and the other is connected to ground after series capacitor C6; the positive output terminal 5 of the differential to single-ended chip U2 is connected to the ground. # The pin outputs the modulated single-ended excitation signal EXC′+.

[0032] In this embodiment, the excitation signal modulation circuit realizes the differential-to-single-ended conversion of the excitation signal in the rotary transformer simulator through the differential-to-single-ended chip U2. The signal output by the differential-to-single-ended circuit of the excitation signal EXC=A0 sin(ωt) after passing through the differential-to-single-ended chip U2 is EXC′=A0 sin(ωt).

[0033] like Figure 3As shown, the DAC modulation circuit includes chip U10, DAC chip U11, resistor R44, resistor R45, resistor R46, resistor R47. The chip U10 is a high level output six-way buffer, mainly used to enhance the positive and negative sine PWM digital signal generated by STM32 single-chip microcomputer, model SN74LS07DR. The input end 1 # pin is connected with the SPI_MOSI signal of the STM32 single-chip microcomputer, the output end 2 # of the chip U10 outputs the MOSI_DAC signal, the input end 3 # of the chip U10 is connected with the SPI_CLK signal of the STM32 single-chip microcomputer, the output end 4 # of the chip U10 outputs the CLK_DAC signal, the input end 5 # of the chip U10 is connected with the SPI_CS signal of the STM32 single-chip microcomputer, the output end 6 # of the chip U10 outputs the CS_DAC signal, the 7 # pin of the chip U10 is grounded, the output end 8 # of the chip U10 outputs the LOAD_DAC signal and is connected with +5V voltage after being connected with resistor R44 in series, the 14# pin of the chip U10 is connected with +5V power voltage, the 9# pin, 10# pin, 11# pin, 12# pin, 13# pin of the chip U10 are left floating. The DAC chip U11 is a dual-channel digital-to-analog converter (DAC), mainly used for converting digital signals into analog signals, model MCP4822-E / SN. The 1 # pin of the DAC chip U11 is connected with +5V power voltage, the input end 2 # of the DAC chip U11 is connected with the output signal CS_DAC of the chip U10 and is connected with +5V voltage after being connected with resistor R46 in series, the input end 3 # of the DAC chip U11 is connected with the output signal CLK_DAC of the chip U10 and is connected with +5V voltage after being connected with resistor R45 in series, the input end 4 # of the DAC chip U11 is connected with the output signal MOSI_DAC of the chip U10 and is connected with +5V voltage after being connected with resistor R47 in series, the input end 5 # of the DAC chip U11 is connected with the output signal LOAD_DAC of the chip U10, the 7 # pin of the DAC chip U11 is grounded, the output end 6 # of the DAC chip U11 outputs the DAC_S signal, the output end 8 # of the DAC chip U11 outputs the DAC_C signal.

[0034] In this embodiment, the DAC modulation circuit enhances the sine and cosine PWM digital signals generated by the STM32 microcontroller through chip U10 and DAC chip U11, and converts the digital signals into analog signals. In this invention, there is no need to acquire the excitation signal through a high-speed ADC; instead, the sine and cosine PWM digital signals generated by the STM32 microcontroller are modulated by the DAC modulation circuit. Finally, the excitation signal is multiplied by the DAC-modulated sine and cosine signals to generate analog sine and cosine signals, greatly reducing costs, accelerating the development process, and enabling faster transmission of sine and cosine signals.

[0035] like Figure 4 As shown, the signal modulation circuit includes chips U7, U8, U12.1, resistors R30, R32, R35, R36, R38, R39, R42, R43, capacitors C10, C12, C14, and C15. Chips U7 and U8 are ultra-high-speed voltage feedback operational amplifiers used to process high-speed DAC signals, model AD8005ARZ. Chip U12.1 is a high-speed, low-power, low-distortion dual operational amplifier used to process high-speed DAC signals, model AD8052ARZ-REEL. Chip U7 has two... # The circuit connected to the pins is divided into two branches, one of which is the 6 pins of chip U7. # The pin connections are as follows: another series resistor R35 is connected to pin 3 of chip U12.1. # Pin connections; the 3rd pin of the chip U7 # The circuit connected to the pins is divided into two branches. One branch is connected in series with resistor R32 and then to the output signal DAC_C of chip U11. The other branch is connected in series with capacitor C12 and then to ground. The 4 pins of chip U7... # Pin grounded, chip U7's 7 # Pin 1 is connected to a +5V power supply. # pin, 5 # pins, 8 # The pin is floating. The second pin of chip U8... # The circuit connected to the pins is divided into three branches, one of which is connected to the six pins of the chip U8. # The pin connections are as follows: a series resistor R36 is connected to pin 2 of chip U12.1. # The pin is connected, and another series resistor R38 is grounded; the 3rd pin of the chip U8 # The circuit splits into two branches after being connected in series with resistor R39. One branch is connected in series with resistor R43 and then to a +3.3V power supply. The other branch is connected in parallel with resistor R42 and capacitor C14 and then grounded. The 4th pin of chip U8... # Pin grounded, chip U8's 7 #Pin, 1 # Pin, 5 # Pin, 8 # Pin, 1 # Pin, 3 # Pin, 1 # Pin, 4 # Pin, 8 # Pin, -5V power supply voltage.

[0036] As Figure 5 shown, the signal circuit includes chip U6, chip U9, chip U12.2, resistor R28, resistor R29, resistor R31, resistor R33, resistor R34, resistor R37, resistor R40, resistor R41, capacitor C11, capacitor C13, capacitor C16. The chip of the signal circuit is consistent with the chip of the signal modulation circuit. The model of chip U6, U9 adopts AD8005ARZ, and the model of chip U12.2 adopts AD8052ARZ-REEL. Pin 2 # of the chip U6 is connected to two branches, one branch is connected to pin 6 # of the chip U6, and the other branch is connected to pin 6 # of the chip U6 in series with resistor R34; pin 3 # of the chip U6 is connected to two branches, one branch is connected to +3.3V power supply voltage in series with resistor R28, and the other branch is connected to ground in series with resistor R29 and capacitor C11; pin 4 # of the chip U6 is connected to ground, pin 7 # of the chip U6 is connected to +5V power supply voltage, pin 1 # Pin, 5 # Pin, 8 # Pin, 1 # Pin, 6 # Pin, 5 # Pin, 3 # Pin, 4 # Pin, ground, pin 7# Pin connects +5V power voltage, 1 # Pin, 5 # Pin, 8 # Pin is left floating. The 5 # Pin is connected to a circuit which is divided into two branches, one branch is connected with the parallelly arranged resistor R41 and capacitor C13 and then connected with the 7 # Pin is connected, and the other branch is connected with the resistor R37 in series; the 7 # Pin outputs the modulated DAC signal DAC_SIN and is used for outputting to the multiplication module; the 6 # Pin is connected with the resistor R33 in series and then grounded.

[0037] In the embodiment, the signal modulation circuit and the signal circuit realize the modulation processing of the signals DAC_C and DAC_S from the output of the chip U1 through the chip U6, the chip U7, the chip U8, the chip U9, the chip U12.1 and the chip U12.2; in the utility model, the positive and negative sine PWM digital signals generated by the STM32 single-chip microcomputer are subjected to the DAC modulation circuit and the signal processing circuit, and the generated positive and negative sine modulation signals are COS'=Tcos(θ) and SIN'=Tsin(θ) respectively, which are applied in the multiplication circuit.

[0038] As Figure 6 shown, the multiplication circuit comprises the chip U1, the chip U4, the resistor R3, the resistor R8, the resistor R13, the resistor R14, the resistor R16 and the resistor R20. The chip U1 and the chip U4 are a high-speed and precise analog multiplier, and its main function is to perform the multiplication operation of two analog signals, and the model adopts AD835ARZ. In the utility model, the modulated excitation signal is multiplied with the positive and negative sine modulation signals to generate the analog positive and negative sine signals of the resolver simulator; the input end 1 # Pin (Y1) is connected with the DAC_SIN signal subjected to the signal processing circuit, and the input end 2 # Pin (Y2) is grounded, and the 3 # Pin is connected with -5V voltage; the input end 4 # of the chip U1, the circuit connected with the pin (Z) is divided into two branches, one branch is connected with the resistor R8 in series and then grounded, and the other branch is connected with the resistor R3 in series and then connected with the output end 5 # of the chip U1, the pin (W) is connected; the output end 5 # of the chip U1, the pin (W) outputs the analog sine signal SIN subjected to the multiplier processing; the 6 # Pin is connected with +5V power voltage; the input end 7 #Pin (X2) is connected to ground via series resistor R14, and input terminal 7 of chip U1 is connected to ground. # Pin (X2) is connected in series with resistor R13 and is connected to the modulated single-ended excitation signal EXC′+ of chip U2; input terminal 8 of chip U1 # Pin (X1) is grounded. Input terminal 1 of chip U4. # Pin (Y1) is connected to the DAC_COS signal processed by the signal processing circuit, and pin 2 is the input terminal of chip U4. # Pin (Y2) is grounded, and pin 3 of chip U4 is connected. # Pin 4 is connected to -5V voltage; input terminal 4 of chip U4 # Pin (Z) is connected in series with resistor R20 to ground, and chip U4's 4 # The series resistor R16 on pin (Z) is connected to the output terminal 5 of chip U4. # Pin (W) connection; Output terminal 5 of chip U4 # Pin (W) outputs the analog cosine signal COS processed by the multiplier; pin 6 of chip U4 # Pin 7 is connected to a +5V power supply; input terminal 7 of chip U4. # Pin (X2) is connected to ground via series resistor R14, and input terminal 7 of chip U4 is connected to ground. # Pin (X2) is connected in series with resistor R13 and is connected to the modulated single-ended excitation signal EXC′+ of chip U2; input terminal 8 of chip U4 # Pin (X1) is grounded.

[0039] In this embodiment, the multiplication circuit multiplies the modulated excitation signal with the sine and cosine modulation signal using chips U1 and U4 to generate the simulated sine and cosine signals of the rotary transformer simulator; the multiplier operation formula of chips U1 and U4 is W = (X1-X2)*(Y1-Y2)+Z; next, the simulated COS signal and the simulated SIN signal are differentially processed.

[0040] like Figure 7 As shown, the analog SIN signal output circuit includes a single-ended to differential chip U3, a pin header terminal CN1, resistors R1, R4, R9, R10, R11, and R12, and tantalum capacitors C3, C1, and C2. Chip U3 is an AD8475ARMZ. The chip U3 has a 1... # The pin is connected in series with resistor R11 and then grounded; the 2 of chip U3 # The pin is connected in series with resistor R12 and then grounded; pin 3 of chip U3 # The circuit connected to the pins is divided into two branches: one branch is connected to the +5V power supply voltage, and the other branch is connected to ground after being connected in parallel with capacitor C2 and tantalum capacitor C3; the 4th pin of chip U3 #Pin connected with parallel capacitor C1 and resistor R4, then ground, and then connect +5V power voltage through resistor R1 in series; pin 7 of chip U3 # Pin is left floating; pin 8 of chip U3 # Pin is connected to ground; pin 9 of chip U3 # Pin connects output signal SIN from chip U1 through resistor R9 in series; pin 10 of chip U3 # Pin connects output signal SIN from chip U1 through resistor R10 in series; positive output terminal 5 of chip U3 # Pin outputs analog sine signal SIN+ of resolver simulator; negative output terminal 6 of chip U3 # Pin outputs analog sine signal SIN- of resolver simulator; needle base terminal CN1 connects analog sine differential signal of resolver simulator output by chip U3.

[0041] As shown in Figure 8 , the analog COS signal output circuit includes chip U5, needle base terminal CN3, resistor R18, resistor R21, resistor R24, resistor R25, resistor R26, resistor R27, tantalum capacitor C9, capacitor C5, capacitor C8. Chip U5 uses AD8475ARMZ. Pin 1 of chip U5 # Pin is connected to ground through resistor R26 in series; pin 2 of chip U5 # Pin is connected to ground through resistor R27 in series; pin 3 of chip U5 # Pin is connected to two branches, one branch is connected to +5V power voltage, and the other branch is connected to ground through parallel capacitor C8 and tantalum capacitor C9; pin 4 of chip U5 # Pin is connected to ground through parallel capacitor C5 and resistor R21, and then connect +5V power voltage through resistor R18 in series; pin 7 of chip U5 # Pin is left floating; pin 8 of chip U5 # Pin is connected to ground; pin 9 of chip U5 # Pin connects output signal COS from chip U4 through resistor R24 in series; pin 10 of chip U5 # Pin connects output signal COS from chip U4 through resistor R25 in series; positive output terminal 5 of chip U5 # Pin outputs analog cosine signal COS+ of resolver simulator; negative output terminal 6 of chip U5 # Pin outputs analog cosine signal COS- of resolver simulator; needle base terminal CN3 connects analog cosine differential signal of resolver simulator output by chip U5.

[0042] In the embodiment, the analog SIN signal output circuit and the analog COS signal output circuit are used to convert the analog single-ended cosine signals of the resolver simulator generated by the multiplication circuit into differential cosine signals, the analog COS signal is COS=A0Tcos(θ)sin(ωt), and the analog SIN signal is SIN=A0Tsin(θ)sin(ωt); then the analog single-ended cosine signals are transmitted to the controller to realize the closed-loop control simulation of the motor simulator.

[0043] The above embodiment is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Therefore, any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the present application should fall within the protection scope of the technical scheme of the present application.

Claims

1. A resolver analog circuit based on the principle of multiplication, characterized by The simulation circuit comprises: an excitation signal modulation circuit, a DAC modulation circuit, a signal processing circuit, a multiplication circuit, an analog COS signal output circuit and an analog SIN signal output circuit. An output end of the excitation signal modulation circuit is connected with an input end of the multiplication circuit; an output end of the STM32 single-chip microcomputer is connected with an input end of the DAC modulation circuit, the DAC modulation circuit is used for modulating the sine and cosine PWM digital signals generated by the STM32 single-chip microcomputer, and then the signals are processed by the signal processing circuit and output to be connected with the input end of the multiplication circuit; the multiplication circuit multiplies the signals output by the DAC modulation circuit with the signals output by the excitation signal modulation circuit to generate sine and cosine signals, the input end of the multiplication circuit is connected with the excitation signal modulation circuit and the DAC modulation circuit, and the output end of the multiplication circuit is connected with the analog COS signal output circuit and the analog SIN signal output circuit; the analog COS signal output circuit and the analog SIN signal output circuit output analog COS signals and analog SIN signals, and the output ends of the analog COS signal output circuit and the analog SIN signal output circuit are connected with a controller. In the resolver simulation circuit, the excitation signal is output by the excitation signal modulation circuit, and the sine and cosine signals are converted into sine and cosine modulation signals by the DAC modulation circuit and the signal processing circuit; the output signals of the DAC modulation circuit and the excitation signal modulation circuit are input into the multiplication circuit to generate analog sine and cosine signals.

2. Resolver analog circuit based on the multiplication principle according to claim 1, characterized in that, The signal processing circuit comprises a signal modulation circuit and a signal circuit.

3. Resolver analog circuit based on the multiplication principle according to claim 2, characterized in that, ​ 4. The resolver analog circuit based on the multiplication principle according to claim 3, characterized in that The excitation signal modulation circuit includes differential to single-ended chip U2, resistance R2, resistance R5, resistance R6, resistance R7, resistance R15, resistance R17, resistance R19, resistance R22, resistance R23, capacitor C6, capacitor C7, tantalum capacitor C4; one end of the resistance R7 is connected with excitation signal EXC+, the other end of the resistance R7 is grounded; one end of the resistance R15 is connected with excitation signal EXC-, the other end of the resistance R15 is grounded; the positive input end 10 of the differential to single-ended chip U2 is connected with the resistance R7 # The pin is connected with excitation signal EXC+ after connecting with resistance R5 in series, the positive input end 9 of the differential to single-ended chip U2 is connected with the resistance R5 # The pin is connected with excitation signal EXC+ after connecting with resistance R2 in series, the 8 of the differential to single-ended chip U2 is connected with the resistance R2 # The pin is grounded, the 7 of the differential to single-ended chip U2 is grounded # The pin is left floating, the negative output end 6 of the differential to single-ended chip U2 is left floating # The pin is grounded after connecting with resistance R6 in series, the negative input end 1 of the differential to single-ended chip U2 is grounded after connecting with resistance R6 in series # The pin is connected with excitation signal EXC- after connecting with resistance R17 in series, the negative input end 2 of the differential to single-ended chip U2 is connected with excitation signal EXC- after connecting with resistance R17 in series # The pin is connected with excitation signal EXC- after connecting with resistance R22 in series, the 3 of the differential to single-ended chip U2 is connected with excitation signal EXC- after connecting with resistance R22 in series # The circuit connected with the pin is divided into two branches, one branch is connected with +5V power voltage, the other branch is grounded after passing through capacitor C7 and tantalum capacitor C4 arranged in parallel; the 4 of the differential to single-ended chip U2 is grounded after passing through capacitor C7 and tantalum capacitor C4 arranged in parallel # The circuit connected with the pin is divided into three branches, one branch is connected with +5V power voltage after connecting with resistance R19 in series, one branch is grounded after connecting with resistance R23 in series, the other branch is grounded after connecting with capacitor C6 in series; the positive output end 5 of the differential to single-ended chip U2 is connected with the resistance R19 in series # The pin outputs single-ended excitation signal EXC′+ after modulation.

5. Resolver analog circuit based on the multiplication principle according to claim 4, characterized in that, The DAC modulation circuit includes chip U10, DAC chip U11, resistors R44, R45, R46, and R47; the input terminal of chip U10 is 1. # Pin 2 is connected to the SPI_MOSI signal of the STM32 microcontroller, and is the output of chip U10. # Pin 3 outputs the MOSI_DAC signal, and is the input terminal 3 of chip U10. # The pin is connected to the SPI_CLK signal of the STM32 microcontroller, and the output of chip U10 is 4. # The pin outputs the CLK_DAC signal, and the input terminal 5 of chip U10... # The pin is connected to the SPI_CS signal of the STM32 microcontroller, and the output terminal 6 of chip U10 is... # Pin 7 outputs the CS_DAC signal, which is the 7th pin of chip U10. # Pin grounded, output terminal 8 of chip U10 # The LOAD_DAC signal is output from the pin and connected to a +5V voltage via a series resistor R44. Pin 14 of chip U10 is connected to the +5V power supply, while pins 9, 10, 11, 12, and 13 of chip U10 are left floating. Pin 1 of DAC chip U11... # Pin 2 is connected to a +5V power supply. # Pin 3 is connected to the output signal CS_DAC of chip U10 and then connected to +5V voltage after being connected in series with resistor R46. Input pin 3 of DAC chip U11... # The pin is connected to the output signal CLK_DAC of chip U10 and then connected to +5V after being connected in series with resistor R45. The input pin 4 of DAC chip U11... # The pin is connected to the output signal MOSI_DAC of chip U10 and then connected to +5V after being connected in series with resistor R47. The input terminal of DAC chip U11 is 5. # Pin 7 is connected to the output signal LOAD_DAC of chip U10, and pin 7 of DAC chip U11 is connected to the output signal LOAD_DAC of chip U10. # Pin grounded, output terminal 6 of DAC chip U11 # The pin outputs the DAC_S signal, and the output terminal 8 of the DAC chip U11... # The pin outputs the DAC_C signal.

6. The resolver analog circuit based on the multiplication principle according to claim 5, characterized in that, The signal modulation circuit includes chip U7, chip U8, chip U12.1, resistance R30, resistance R32, resistance R35, resistance R36, resistance R38, resistance R39, resistance R42, resistance R43, capacitor C10, capacitor C12, capacitor C14, capacitor C15; the 2 # pin of the chip U7 is connected with the circuit, one branch is connected with the 6 # pin of the chip U7, and the other branch is connected with the 3 # pin of the chip U12.1 after the resistance R35 is connected in series; the 3 # pin of the chip U7 is connected with the circuit, one branch is connected with the output signal DAC_C of the chip U11 after the resistance R32 is connected in series, and the other branch is connected with the ground after the capacitor C12 is connected in series; the 4 # pin of the chip U7 is connected with the ground, and the 7 # pin of the chip U7 is connected with +5V power voltage, and the 1 # pin of the chip U7, 5 # pin of the chip U7, 8 # pin of the chip U7 is left floating; the 2 # pin of the chip U8 is connected with the circuit, one branch is connected with the 6 # pin of the chip U8, one branch is connected with the 2 # pin of the chip U12.1 after the resistance R36 is connected in series, and the other branch is connected with the ground after the resistance R38 is connected in series; the 3 # pin of the chip U8 is connected with two branch circuits after the resistance R39 is connected in series, one branch is connected with +3.3V power voltage after the resistance R43 is connected in series, and the other branch is connected with the ground after the resistance R42 and the capacitor C14 which are arranged in parallel are connected; the 4 # pin of the chip U8 is connected with the ground, and the 7 # pin of the chip U8 is connected with +5V power voltage, and the 1 # pin of the chip U8, 5 # pin of the chip U8, 8 # pin of the chip U8 is left floating; the 1 # pin of the chip U12.1 is connected with the 3 # pin of the chip U12.1 after the resistance R30 and the capacitor C10 which are arranged in parallel are connected, and the 1 # pin of the chip U12.1 outputs the DAC signal DAC_COS after modulation and is used for outputting to a multiplication module; the 4 # pin of the chip U12.1 is connected with +5V power voltage, and the +5V power voltage is connected with the ground after the capacitor C15 is connected in series; the 8 # pin of the chip U12.1 is connected with -5V power voltage.

7. Resolver analog circuit based on the multiplication principle according to claim 6, characterized in that, The signal circuit includes chip U6, chip U9, chip U12.2, resistance R28, resistance R29, resistance R31, resistance R33, resistance R34, resistance R37, resistance R40, resistance R41, capacitor C11, capacitor C13, capacitor C16; the 2 # pin is connected with the 6 # pin of the chip U6; another branch is connected with the 6 # pin of the chip U12.2 after being connected with the resistance R34 in series; the 3 # pin of the chip U6 is connected with the resistance R31 in series and is divided into two branches, one branch is connected with the +3.3V power voltage after being connected with the resistance R28 in series, and the other branch is connected with the resistance R29 and the capacitor C11 arranged in parallel and then grounded; the 4 # pin of the chip U6 is grounded; the 7 # pin of the chip U6 is connected with the +5V power voltage; the 1 # pin of the chip U6, 5 # pin of the chip U6, 8 # pin of the chip U6 is left floating; the 2 # pin is connected with the 6 # pin of the chip U9, and the other branch is connected with the 5 # pin of the chip U12.2 after being connected with the resistance R37 in series; the 3 # pin of the chip U9 is connected with the output signal DAC_S of the chip U11 after being connected with the resistance R40 in series, and the other branch is connected with the ground after being connected with the capacitor C12 in series; the 4 # pin of the chip U9 is grounded; the 7 # pin of the chip U9 is connected with the +5V power voltage; the 1 # pin of the chip U9, 5 # pin of the chip U9, 8 # pin of the chip U9 is left floating; the 5 # pin is connected with the 7 # pin of the chip U12.2 after being connected with the resistance R41 and the capacitor C13 arranged in parallel, and the other branch is connected with the resistance R37 in series; the 7 # pin of the chip U12.2 outputs the DAC signal DAC_SIN after being modulated and is used for outputting to a multiplication module; the 6 # pin of the chip U12.2 is grounded after being connected with the resistance R33 in series.

8. Resolver analog circuit based on the multiplication principle according to claim 7, characterized in that, The multiplication circuit includes chip U1, chip U4, resistance R3, resistance R8, resistance R13, resistance R14, resistance R16, resistance R20; the input end 1 of the chip U1 # The pin is connected with the DAC_SIN signal passing through the signal processing circuit, and the input end 2 of the chip U1 # The pin is grounded, and the 3 of the chip U1 # The pin is connected with-5V voltage, and the input end 4 of the chip U1 # The pin is connected with the circuit, which is divided into two branches, one branch is connected with the resistance R8 in series and grounded, and the other branch is connected with the resistance R3 in series and the output end 5 of the chip U1 # The pin is connected, and the output end 5 of the chip U1 # The pin outputs the analog sine signal SIN processed by the multiplier, and the 6 of the chip U1 # The pin is connected with +5V power voltage, and the input end 7 of the chip U1 # The pin is connected with the resistance R14 in series and grounded, and the input end 7 of the chip U1 # The pin is connected with the resistance R13 in series and the single-ended excitation signal EXC′+ modulated by the chip U2, and the input end 8 of the chip U1 # The pin is grounded, and the input end 1 of the chip U4 # The pin is connected with the DAC_COS signal passing through the signal processing circuit, and the input end 2 of the chip U4 # The pin is grounded, and the 3 of the chip U4 # The pin is connected with-5V voltage, and the input end 4 of the chip U4 # The pin is connected with the resistance R20 in series and grounded, and the 4 of the chip U4 # The pin is connected with the resistance R16 in series and the output end 5 of the chip U4 # The pin is connected, and the output end 5 of the chip U4 # The pin outputs the analog cosine signal COS processed by the multiplier, and the 6 of the chip U4 # The pin is connected with +5V power voltage, and the input end 7 of the chip U4 # The pin is connected with the resistance R14 in series and grounded, and the input end 7 of the chip U4 # The pin is connected with the resistance R13 in series and the single-ended excitation signal EXC′+ modulated by the chip U2, and the input end 8 of the chip U4 # The pin is grounded.

9. Resolver analog circuit based on the multiplication principle according to claim 8, characterized in that, The analog SIN signal output circuit comprises a single-ended to differential chip U3, a needle base terminal CN1, a resistor R1, a resistor R4, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a tantalum capacitor C3, a capacitor C1 and a capacitor C2; 1 # The pin is connected with the resistor R11 in series and grounded; 2 # The pin is connected with the resistor R12 in series and grounded; 3 # The pin is connected with two branches, one of which is connected with a +5V power voltage, and the other of which is connected with the capacitor C2 and the tantalum capacitor C3 in parallel and grounded; 4 # The pin is connected with the capacitor C1 and the resistor R4 in parallel and grounded, and is further connected with the +5V power voltage in series with the resistor R1; 7 # The pin is left floating; 8 # The pin is grounded; 9 # The pin is connected with the output signal SIN from the chip U1 in series with the resistor R9; 10 # The pin is connected with the output signal SIN from the chip U1 in series with the resistor R10; the positive output end 5 of the chip U3 # The pin outputs the analog sine signal SIN+ of the rotary transformer simulator; the negative output end 6 of the chip U3 # The pin outputs the analog sine signal SIN- of the rotary transformer simulator; the needle base terminal CN1 is connected with the analog sine differential signal of the rotary transformer simulator output by the chip U3.

10. The resolver analog circuit based on the multiplication principle according to claim 9, characterized in that, The simulated COS signal output circuit includes chip U5, pin header terminal CN3, resistors R18, R21, R24, R25, R26, R27, tantalum capacitor C9, capacitor C5, and capacitor C8; the chip U5 has 1 # The pin is connected in series with resistor R26 and then grounded; the 2 of chip U5 # The pin is connected in series with resistor R27 and then grounded; pin 3 of chip U5 # The circuit connected to the pins is divided into two branches: one is connected to the +5V power supply voltage, and the other is connected to ground after being connected in parallel with capacitor C8 and tantalum capacitor C9; the 4th pin of chip U5 # The pin is connected to ground via a parallel capacitor C5 and resistor R21, and then connected in series with resistor R18 to the +5V power supply; chip U5's pin 7 # Pin floating; chip U5's 8 # Pin grounded; chip U5's 9 # The pin is connected in series with resistor R24 ​​to the output signal COS from chip U4; the pin of chip U5 is connected to the 10 # The pin is connected in series with resistor R25 and then connected to the output signal COS of chip U4; the positive output terminal 5 of chip U5 is connected to the pin. # The pin outputs the analog cosine signal COS+ from the rotary transformer simulator; the inverted output terminal 6 of the chip U5... # The pin outputs the analog cosine signal COS- of the rotary transformer simulator; the pin socket terminal CN3 connects to the analog cosine differential signal of the rotary transformer simulator output by chip U5.

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