High-reliability universal rotary transformer decoding circuit module

Abstract

The invention relates to the field of motor control systems, and discloses a high-reliability universal rotary transformer decoding circuit module, which comprises a decoder AD2S1210, a power supply circuit, a rotary transformer excitation signal driving circuit, a rotary transformer feedback signal conditioning circuit, a communication interface circuit and a self-checking circuit, the output end of the decoder AD2S1210 is connected to the input end of the rotary transformer excitation signal driving circuit, and the signal is output to the rotary transformer after being driven and amplified; a feedback signal of the rotary transformer is connected to the input end of the rotary transformer feedback signal conditioning circuit, and a signal of the rotary transformer feedback signal conditioning circuit is output to the input end of the decoder AD2S1210; the decoder AD2S1210 interacts with an external controller through the communication interface circuit; and the self-checking circuit feeds back an acquisition result to the module external unit. According to the invention, the quality of an excitation signal and a feedback signal can be ensured, and various position information interfaces and a key voltage self-checking high-reliability universal rotary transformer decoding circuit are led out.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor control systems, in particular to a high-reliability general resolver decoding circuit module. BACKGROUND

[0002] With the development of digital control technology and digital signal processing technology, the requirements and performance of servo control are continuously improving. In the vector control speed regulation system of permanent magnet synchronous motor, it is necessary to detect the position of the motor rotor in real time to realize the closed-loop control of speed and position. Commonly used position detection sensors include synchros, photoelectric encoders, Hall sensors and rotary transformers. Rotary transformers are composed of high-performance silicon steel laminations and enameled wires with special electromagnetic design. They have good impact resistance, temperature resistance, simple structure, high precision and good time effectiveness, and are widely used in the field of sinusoidal wave permanent magnet synchronous motor control. The resolver circuit needs a resolver decoding chip to provide a sinusoidal oscillator, which provides sinusoidal excitation for the resolver circuit and converts the information at the sine and cosine input ends into digital quantities corresponding to the input angle and speed to transmit to the processor. The processor obtains the angle and speed information to control the motor accordingly.

[0003] The design of the resolver decoding circuit is crucial to the performance and reliability of the resolver decoding. The traditional resolver decoding circuit improves the stability and precision of the decoding circuit through multiple operational amplifiers. Patent No. CN113236441A discloses a single-channel resolver conditioning circuit based on AD2S1210, which uses 12 operational amplifier chips on the AD2S1210 chip and its related circuit to form a high-precision and high-stability resolver conditioning circuit. It aims to solve the problem of low precision of angle sensors and position detection elements in traditional servo mechanisms, but the resolver conditioning circuit uses a large number of components and lacks fault detection function. Patent No. CN117092479A discloses an anti-interference device and method for resolver circuit, which solves the problem of large hardware modification and high cost of existing anti-interference methods, and cannot timely handle faults caused by interference, resulting in poor reliability. However, the method of realizing resolver decoding circuit fault detection completely depends on the first and second fault signals generated by the resolver decoding chip and the processor, and the fault detection form is single. SUMMARY

[0004] The present application provides a high-reliability general resolver decoding circuit module, which aims to solve the problem of insufficient reliability and insufficient universality of existing resolver decoding circuits.

[0005] To solve the above technical problems, the application adopts the following technical solutions: the application provides a high-reliability general resolver decoding circuit module, comprising a decoder AD2S1210, a power supply circuit, a resolver excitation signal driving circuit, a resolver feedback signal conditioning circuit, a communication interface circuit and a self-checking circuit; The power supply circuit provides working power supply for the decoder AD2S1210, the resolver excitation signal driving circuit, the resolver feedback signal conditioning circuit, the communication interface circuit and the self-checking circuit; The excitation signal output end of the decoder AD2S1210 is connected to the input end of the resolver excitation signal driving circuit, and is output to the excitation winding of the resolver after being amplified by driving; the feedback signal of the resolver is connected to the input end of the resolver feedback signal conditioning circuit, and the signal output by the resolver feedback signal conditioning circuit is output to the feedback signal input end of the decoder AD2S1210; the decoder AD2S1210 calculates the position and speed information of the resolver through an internal decoding algorithm, and interacts with an external controller through the communication interface circuit; the self-checking circuit collects the key voltage node signals of the power supply circuit, the resolver excitation signal driving circuit and the resolver feedback signal conditioning circuit respectively, and feeds back the collection results to an external unit of the module, so as to realize system state monitoring and fault diagnosis.

[0006] Further, the power supply circuit comprises a first voltage reduction unit and a secondary voltage reduction unit, the first voltage reduction unit adopts a DCDC BUCK circuit, is used for accepting a wide voltage input, and generates an analog circuit power supply, and the secondary voltage reduction unit is used for generating a digital circuit power supply through the analog circuit power supply.

[0007] Further, the resolver excitation signal driving circuit comprises a first filter unit, a bias voltage generation unit, a signal amplification unit, a current amplification unit and a first EMC protection unit; The first filter unit is used for filtering out the noise generated by the programmable sine wave oscillator in the AD2S1210; The bias voltage generation unit is used for pushing the center voltage of the resolver excitation signal to 6V, so that the resolver decoding circuit module does not need a negative power supply; The signal amplification unit is used for amplifying the amplitude of the resolver excitation signal to a rated value required by the resolver; The current amplification unit is used for amplifying the power of the resolver excitation signal; The first EMC protection unit is used for reducing the electromagnetic emission on the signal line, and is used for protecting the resolver decoding circuit module from the external electromagnetic interference conducted through the resolver excitation signal line.

[0008] Further, the resolver feedback signal conditioning circuit comprises a bias unit, a second filter unit and a second EMC protection unit; The bias unit is used for pulling the resolver feedback signal to the bias 2.5V position; The second filtering unit is used to filter out noise generated by the resolver itself; The second EMC protection unit is used to reduce electromagnetic emissions on the signal lines and to protect the resolver decoding circuit module from external electromagnetic interference conducted through the resolver feedback signal lines.

[0009] Furthermore, the self-test circuit includes a power supply circuit voltage output unit, a resolver excitation signal drive circuit key voltage output unit, a resolver feedback signal conditioning circuit key voltage output unit, and a resolver decoding chip fault generation unit. The power supply circuit voltage lead-out unit is used to lead out and detect the analog circuit power supply and the digital circuit power supply. The key voltage extraction unit of the resolver excitation signal driving circuit includes a low-pass filter for extracting and detecting the center voltage of the resolver excitation signal driving circuit. The key voltage extraction unit of the resolver feedback signal conditioning circuit includes a low-pass filter for extracting and detecting the center voltage of the resolver feedback signal driving circuit. The resolver decoding chip fault generation unit is part of the decoder AD2S1210. It is used to autonomously detect whether there is a problem with the sine and cosine feedback signals in the decoding circuit and to represent it through logic levels.

[0010] Furthermore, it adopts a highly universal physical interface design, facilitating connection with various controller models that require receiving digital signals or incremental encoder signals. The beneficial effects of this invention are: it can guarantee the quality of excitation signal and feedback signal, introduces multiple position information interfaces, and introduces a high-reliability general-purpose resolver decoding circuit with key voltage self-test. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the circuit framework of the resolver decoding circuit module of the present invention; Figure 2 This is a schematic diagram of the specific circuit of the resolver excitation signal driving circuit of the present invention; Figure 3 This is a schematic diagram of the specific circuit of the resolver feedback signal conditioning circuit of the present invention; Figure 4 This is a schematic diagram of the self-test circuit of the present invention. Detailed Implementation

[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] like Figure 1 As shown, the resolver decoding circuit module of the present invention is connected between the MCU and the resolver. The resolver decoding circuit module includes a decoder AD2S1210, a power supply circuit, a resolver excitation signal driving circuit, a resolver feedback signal conditioning circuit, a communication interface circuit, and a self-test circuit.

[0014] like Figure 2 As shown, the resolver excitation signal driving circuit includes a first filtering unit, a bias voltage generation unit, a signal amplification unit, a current amplification unit, and a first EMC protection unit. It receives two differential sinusoidal signals from the decoder AD2S1210 and outputs the driven signal to the resolver. The first filtering unit is used to filter out noise from the differential signal generated by the decoder AD2S1210; The bias voltage generation unit is used to push the center voltage of the resolver excitation signal to 6V, so that the resolver decoding module does not require a negative power supply. The signal amplification unit is used to amplify the amplitude of the resolver excitation signal to the rated value required by the resolver; The current amplification unit is used to amplify the power of the resolver excitation signal; The first EMC protection unit serves two purposes: firstly, to reduce electromagnetic emissions on the signal lines, and secondly, to protect the resolver decoding circuit from external electromagnetic interference conducted through the resolver excitation signal lines, thereby maintaining signal integrity and system reliability.

[0015] In this embodiment, please refer to Figure 2 Taking the excitation signal EXC as an example, the excitation signal EXC is generated by the decoder AD2S1210 and is the input of the signal amplification unit. The signal amplification unit consists of an operational amplifier U7, a first resistor R8, and a second resistor R9. The operational amplifier U7 also has the function of current amplification. The filter unit is connected in parallel on the operational amplifier feedback loop and consists of a first capacitor C24. The bias voltage generation unit consists of a third resistor R19 and a first resistor array RN7. The EMC protection unit consists of a first ferrite bead L18 and a bidirectional transient voltage suppressor D3. The bias voltage is input to the positive terminal of the operational amplifier U7, and the excitation signal EXC is input to the negative terminal of the operational amplifier U7. The output of the operational amplifier U7 is sent to the EMC protection unit. The driving circuit of the excitation signal EXC- is the same as the above circuit.

[0016] like Figure 3 As shown, the resolver feedback signal conditioning circuit includes a bias unit, a second filter unit, and a second EMC protection unit. The bias unit is used to pull the resolver feedback signal to the bias 2.5V position; The second filtering unit is used to filter out noise generated by the resolver itself; The second EMC protection unit serves two purposes: firstly, to reduce electromagnetic emissions on the signal lines, and secondly, to protect the resolver decoding circuit from external electromagnetic interference conducted through the resolver feedback signal lines, thereby maintaining signal integrity and system reliability.

[0017] In this embodiment, please refer to Figure 3 The +2.5V voltage in the bias unit is provided by the AD2S1210 decoder and connected to the four feedback signals through the third resistor array RN9. The second filter unit consists of the second resistor array RN8, the second capacitor C43, the third capacitor C44, the fourth capacitor C45, and the fifth capacitor C46, ​​forming an RC low-pass filter. The EMC protection unit consists of the second ferrite bead L8, the third ferrite bead L9, the fourth ferrite bead L10, the fifth ferrite bead L11, the first bidirectional transient voltage suppressor U18, and the second bidirectional transient voltage suppressor U19. The resolver feedback signals SIN_BE, SINOL_BE, COSOL_BE, and COS_BE are first input to the second filter unit. The filtered signals are then input to the bias unit. The signals affected by the bias unit are input to the second EMC protection unit. Finally, SIN, SINOL, COSOL, and COS signals with appropriate voltage ranges are generated and input to the AD2S1210 decoder.

[0018] Figure 4 This is a schematic diagram of the self-test circuit of this application, as shown below. Figure 4 As shown, the self-test circuit includes a power supply circuit voltage output unit, a resolver excitation signal drive circuit key voltage output unit, a resolver feedback signal conditioning circuit key voltage output unit, and a resolver decoding chip fault generation unit.

[0019] The power supply circuit voltage lead-out unit is used to lead out and detect the analog circuit power supply and the digital circuit power supply. The key voltage extraction unit of the resolver excitation signal driving circuit includes a first low-pass filter for extracting and detecting the center voltage of the resolver excitation signal driving circuit. The key voltage extraction unit of the resolver feedback signal conditioning circuit includes a second low-pass filter for extracting and detecting the center voltage of the resolver feedback signal driving circuit. The resolver decoding chip fault generation unit is part of the decoder AD2S1210. It can autonomously detect whether there is a problem with the sine and cosine feedback signals in the decoding circuit and represent it through logic levels.

[0020] In this embodiment, please refer to Figure 4 The power supply circuit voltage output unit is directly connected to the power supply. The resolver decoding chip fault generation unit is provided by the decoder AD2S1210. The resolver excitation signal drive circuit key voltage output unit consists of the fourth resistor R16, the fifth resistor R17, the sixth capacitor C35, and the sixth resistor R36. The resolver feedback signal conditioning circuit key voltage output unit includes all the detected quantities connected to the external controller through a connector.

[0021] While preferred embodiments of the present invention have been disclosed above, they are not intended to limit the invention. Obviously, it is neither necessary nor possible to exhaustively describe all possible implementations. Any researcher in the art can modify and alter the research scheme of the present invention using the design methods and content of the disclosed embodiments without departing from the spirit and scope of the invention. Therefore, any simple modifications, parameter changes, and alterations made to the above embodiments based on the research essence of the present invention, without departing from the content of the present invention, fall within the protection scope of the present invention.

[0022] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A highly reliable universal resolver decoding circuit module, characterized in that, include: Decoder AD2S1210, power supply circuit, resolver excitation signal drive circuit, resolver feedback signal conditioning circuit, communication interface circuit and self-test circuit; The power supply circuit provides operating power for the AD2S1210 decoder, the resolver excitation signal drive circuit, the resolver feedback signal conditioning circuit, the communication interface circuit, and the self-test circuit. The excitation signal output of the AD2S1210 decoder is connected to the input of the resolver excitation signal drive circuit. After amplification, the signal is output to the excitation winding of the resolver. The feedback signal of the resolver is connected to the input of the resolver feedback signal conditioning circuit, and the signal output of the resolver feedback signal conditioning circuit is sent to the feedback signal input of the AD2S1210 decoder. The AD2S1210 decoder calculates the position and speed information of the resolver through its internal decoding algorithm and interacts with the external controller through the communication interface circuit. The self-test circuit collects the key voltage node signals of the power supply circuit, the resolver excitation signal drive circuit, and the resolver feedback signal conditioning circuit, and feeds the collection results back to the external unit of the module for system status monitoring and fault diagnosis.

2. The high-reliability universal resolver decoding circuit module as described in claim 1, characterized in that, The power supply circuit includes a first buck unit and a secondary buck unit. The first buck unit uses a DC-DC buck circuit to accept a wide voltage input and generate analog circuit power. The secondary buck unit is used to generate digital circuit power through the analog circuit power.

3. The high-reliability universal resolver decoding circuit module as described in claim 1, characterized in that, The resolver excitation signal driving circuit includes: a first filtering unit, a bias voltage generation unit, a signal amplification unit, a current amplification unit, and a first EMC protection unit; The first filtering unit is used to filter out noise generated by the programmable sine wave oscillator in the AD2S1210; The bias voltage generation unit is used to push the center voltage of the resolver excitation signal to 6V, so that the resolver decoding circuit module does not require a negative power supply. The signal amplification unit is used to amplify the amplitude of the resolver excitation signal to the rated value required by the resolver; The current amplification unit is used to amplify the power of the resolver excitation signal; The first EMC protection unit is used to reduce electromagnetic emissions on the signal lines and to protect the resolver decoding circuit module from external electromagnetic interference conducted through the resolver excitation signal lines.

4. The high-reliability universal resolver decoding circuit module as described in claim 1, characterized in that, The resolver feedback signal conditioning circuit includes: a bias unit, a second filter unit, and a second EMC protection unit; The bias unit is used to pull the resolver feedback signal to the bias 2.5V position; The second filtering unit is used to filter out noise generated by the resolver itself; The second EMC protection unit is used to reduce electromagnetic emissions on the signal lines and to protect the resolver decoding circuit module from external electromagnetic interference conducted through the resolver feedback signal lines.

5. The high-reliability universal resolver decoding circuit module as described in claim 1, characterized in that, The self-test circuit includes a power supply circuit voltage lead-out unit, a resolver excitation signal drive circuit key voltage lead-out unit, a resolver feedback signal conditioning circuit key voltage lead-out unit, and a resolver decoding chip fault generation unit. The power supply circuit voltage lead-out unit is used to lead out and detect the analog circuit power supply and the digital circuit power supply. The key voltage extraction unit of the resolver excitation signal driving circuit includes a low-pass filter for extracting and detecting the center voltage of the resolver excitation signal driving circuit. The key voltage extraction unit of the resolver feedback signal conditioning circuit includes a low-pass filter for extracting and detecting the center voltage of the resolver feedback signal driving circuit. The resolver decoding chip fault generation unit is part of the decoder AD2S1210. It is used to autonomously detect whether there is a problem with the sine and cosine feedback signals in the decoding circuit and to represent it through logic levels.

6. The high-reliability universal resolver decoding circuit module as described in claim 1, characterized in that, It adopts a highly universal physical interface design, which makes it easy to connect and use with various types of controllers that need to receive digital signals or incremental encoder signals.

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