Rotary transformer decoding device

Abstract

The utility model discloses a rotary transformer decoding device which comprises a rotary transformer decoding chip with the model of SC2161, a control module, an excitation amplification module and a signal conditioning module. The rotary transformer decoding chip is connected with the control module, the excitation amplification module and the signal conditioning module, and the rotary transformer is connected with the excitation amplification module and the signal conditioning module. Compared with the prior art, the SC2161 chip which is high in stability and interference resistance is adopted to decode the rotary transformer, reliability and stability of decoding results can be guaranteed, meanwhile, the SC2161 chip is high in resolution ratio, tiny changes of output signals of the rotary transformer can be accurately detected, and the reliability of the decoding results is improved. And the accuracy of the decoding result is further improved.

Description

Technical Field

[0001] This utility model relates to the field of rotary transformer decoding technology, and in particular to a rotary transformer decoding device. Background Technology

[0002] Resolvers (also known as rotary transformers) are widely used as angle sensors in servo systems, motor control and other fields. Their output is an analog electrical signal, which needs to be converted into a digital signal by a decoding device before it can be processed by a digital system.

[0003] However, traditional decoding devices suffer from low integration and numerous peripheral components, resulting in large system size, high cost, and poor stability. Some decoding devices also have poor anti-interference capabilities. In complex industrial environments, factors such as electromagnetic interference and temperature changes can cause noise interference to the resolver output signal. Traditional decoding devices lack effective anti-interference mechanisms, leading to deviations in decoding results and affecting the reliability and stability of the system.

[0004] Therefore, existing decoding devices cannot guarantee the reliability and stability of decoding results. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a rotary transformer decoding device, which uses the SC2161 chip with strong stability and anti-interference ability to decode the rotary transformer, so as to ensure the reliability and stability of the decoding result.

[0006] To solve the above problems, this utility model is implemented according to the following solution:

[0007] A resolver decoding device is provided, comprising: a resolver decoding chip of model SC2161, a control module, an excitation amplification module, and a signal conditioning module;

[0008] The resolver decoding chip is connected to the control module, the excitation amplification module, and the signal conditioning module, and the resolver is connected to the excitation amplification module and the signal conditioning module.

[0009] Compared with the prior art, the beneficial effects of the rotary transformer decoding device of this utility model are as follows: by using the SC2161 chip with strong stability and anti-interference ability to decode the rotary transformer, the reliability and stability of the decoding result can be ensured. At the same time, the SC2161 chip has high resolution and can accurately detect the minute changes in the output signal of the rotary transformer, further improving the accuracy of the decoding result.

[0010] Optionally, the excitation amplification module includes two excitation amplification units with identical structures, each of which includes an operational amplifier circuit and an excitation push-pull output circuit.

[0011] The operational amplifier circuit is connected to the resolver decoding chip and the excitation push-pull output circuit; the excitation push-pull output circuit is connected to the resolver.

[0012] Optionally, the operational amplifier circuit includes a first operational amplifier, a second operational amplifier, a first resistor, a second resistor, and a capacitor;

[0013] The first resistor is connected to the resolver decoding chip; the second operational amplifier is connected to the excitation push-pull output circuit; the first operational amplifier is connected to the second operational amplifier, the first resistor, the second resistor, the capacitor, and the reference voltage.

[0014] Optionally, the excitation push-pull output circuit includes a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first diode, a second diode, a first transistor, and a second transistor.

[0015] One end of the third resistor is connected to the other end of the third resistor in sequence through the fourth resistor, the first diode, the second diode, the fifth resistor, the sixth resistor, the second transistor, the eighth resistor, the seventh resistor, and the first transistor;

[0016] The base of the first transistor is connected to the common connection point of the third and fourth resistors; the base of the second transistor is connected to the common connection point of the fifth and sixth resistors; the power supply voltage is connected to the common connection point of the collector of the first transistor and the third resistor; the common connection point of the collector of the second transistor and the sixth resistor is grounded.

[0017] The second operational amplifier is connected to the common connection point of the first diode and the second diode, and the common connection point of the seventh resistor and the eighth resistor.

[0018] Optionally, the signal conditioning module includes a sine signal conditioning circuit and a cosine signal conditioning circuit;

[0019] The resolver decoding chip is connected to the sine signal conditioning circuit and the cosine signal conditioning circuit; the resolver is connected to the sine signal conditioning circuit and the cosine signal conditioning circuit.

[0020] Optionally, the sinusoidal signal conditioning circuit includes a ninth resistor, a tenth resistor, and an eleventh resistor;

[0021] The resolver decoding chip is connected to the ninth resistor; the resolver is connected to the tenth and eleventh resistors; and the ninth resistor is connected to the tenth and eleventh resistors.

[0022] Optionally, the cosine signal conditioning circuit includes a twelfth resistor, a thirteenth resistor, and a fourteenth resistor;

[0023] The resolver decoding chip is connected to the twelfth resistor; the resolver is connected to the thirteenth and fourteenth resistors; and the twelfth resistor is connected to the thirteenth and fourteenth resistors.

[0024] Optionally, the first operational amplifier and the second operational amplifier are operational amplifiers of model LM324.

[0025] Optionally, the control module includes a main control chip; the main control chip is connected to the resolver decoding chip.

[0026] Optionally, the main control chip is an STM32F103C8T6 chip. Attached Figure Description

[0027] Figure 1 This is an overall block diagram of the present invention;

[0028] Figure 2 This is a schematic diagram of the resolver decoding chip of this utility model;

[0029] Figure 3 This is a circuit diagram of the excitation amplification unit of this utility model for receiving the excitation signal EXC;

[0030] Figure 4 This is a circuit diagram of the excitation amplification unit of this utility model for receiving the excitation signal NEXC;

[0031] Figure 5 This is a schematic diagram of the sinusoidal signal conditioning circuit of this utility model;

[0032] Figure 6 This is a schematic diagram of the cosine signal conditioning circuit of this utility model.

[0033] The attached diagram shows the following labels: 1. Resolver decoding chip; 2. Control module; 3. Excitation amplification module; 301. Operational amplifier circuit; 302. Excitation push-pull output circuit; 4. Signal conditioning module; 401. Sine signal conditioning circuit; 402. Cosine signal conditioning circuit; 5. Resolver. Detailed Implementation

[0034] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0035] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] See Figure 1-2 As shown, the present invention discloses a resolver decoding device, comprising: a resolver decoding chip 1 of model SC2161, a control module 2, an excitation amplification module 3, and a signal conditioning module 4; the resolver decoding chip 1 is connected to the control module 2, the excitation amplification module 3, and the signal conditioning module 4, and the resolver 5 is connected to the excitation amplification module 3 and the signal conditioning module 4; wherein the control module 2 includes a main control chip, which is connected to the resolver decoding chip 1, and the main control chip is a chip of model STM32F103C8T6.

[0037] See Figure 3-4 As shown, the excitation amplification module 3 includes two identical excitation amplification units, one of which is used to receive the excitation signal EXC (see Figure 3). Figure 2 As shown), a NEXC for receiving excitation signals (see...) Figure 3 As shown, each excitation amplification unit includes an operational amplifier circuit 301 and an excitation push-pull output circuit 302; the operational amplifier circuit 301 is connected to the resolver decoding chip 1 and the excitation push-pull output circuit 302; the excitation push-pull output circuit is connected to the rotary transformer 5.

[0038] See Figure 3As shown, in the excitation amplification unit used to receive the excitation signal EXC, the operational amplifier circuit 301 includes a first operational amplifier U1A, a second operational amplifier U1B, a first resistor R1, a second resistor R2, and a capacitor C1; the first resistor R1 is connected to the resolver decoding chip 1; the second operational amplifier U1B is connected to the excitation push-pull output circuit 302; the first operational amplifier U1A, the second operational amplifier U1B, the first resistor R1, the second resistor R2, the capacitor C1, and the reference voltage VREF are connected, and the reference voltage VREF is obtained by dividing the 12V voltage through voltage divider resistors R15 and R16.

[0039] Specifically, the positive input terminal of the first operational amplifier U1A is connected to the reference voltage VREF. The inverting input terminal of the first operational amplifier U1A is connected to the resolver decoder chip 1 through the first resistor R1 to receive the excitation signal EXC from the selector decoder chip. The inverting input terminal of the first operational amplifier U1A is connected to the output terminal of the first operational amplifier U1A through the second resistor R2. Capacitor C1 is connected in parallel with the second resistor R2. The output terminal of the first operational amplifier U1A is connected to the positive input terminal of the second operational amplifier U1B. The inverting input terminal and the output terminal of the second operational amplifier U1B are connected to the excitation push-pull output circuit 302. This operational amplifier circuit 301 mainly amplifies and filters the weak excitation signal EXC output by the resolver 5 to improve signal quality.

[0040] The push-pull output circuit 302 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first diode D1, a second diode D2, a first transistor Q1, and a second transistor Q2; one end of the third resistor R3 is connected to the other end of the third resistor R3 in sequence through the fourth resistor R4, the first diode D1, the second diode D2, the fifth resistor R5, the sixth resistor R6, the second transistor Q2, the eighth resistor R8, the seventh resistor R7, and the first transistor Q1; The base of the first transistor Q1 is connected to the common connection point of the third resistor R3 and the fourth resistor R4; the base of the second transistor Q2 is connected to the common connection point of the fifth resistor R5 and the sixth resistor R6; the 12V supply voltage is connected to the common connection point of the collector of the first transistor Q1 and the third resistor R3; the common connection point of the collector of the second transistor Q2 and the sixth resistor R6 is grounded; the second operational amplifier U1B is connected to the common connection point of the first diode D1 and the second diode D2, and the common connection point of the seventh resistor R7 and the eighth resistor R8.

[0041] Specifically, the first terminal of the seventh resistor R7 is connected to the first terminal of the eighth resistor R8. The inverting input terminal of the second operational amplifier U1B is connected to the common connection point of the seventh resistor R7 and the eighth resistor R8. The output terminal of the second operational amplifier U1B is connected to the cathode of the first diode D1 and the anode of the second diode D2. The anode of the first diode D1 is connected to the first terminal of the fourth resistor R4. The first terminal of the fourth resistor R4 is connected to the first terminal of the third resistor R3 and the base of the first transistor Q1. The collector of the first transistor Q1 is connected to the power supply voltage of 12V. The emitter of the first transistor Q1 is connected to the second terminal of the seventh resistor R7. The second terminal of the eighth resistor R8 is connected to the emitter of the second transistor Q2. The cathode of the second diode D2 is connected to the first terminal of the fifth resistor R5. The second terminal of the fifth resistor R5 is connected to the first terminal of the sixth resistor R6 and the base of the second transistor Q2. The second terminal of the sixth resistor R6 and the collector of the second transistor Q2 share a common ground. The excitation push-pull output circuit 302 is responsible for amplifying the signal processed by the operational amplifier circuit 301 to drive the rotary transformer 5 to work normally. At the same time, the excitation push-pull output circuit 302 can enhance the output load capacity and save the cost of the decoding device.

[0042] See Figure 4 As shown, in the excitation amplification unit used to receive the excitation signal NEXC, the operational amplifier circuit 301 includes a first operational amplifier U1A', a second operational amplifier U1B', a first resistor R1', a second resistor R2', and a capacitor C1'; the first resistor R1' is connected to the resolver decoding chip 1; the second operational amplifier U1B' is connected to the excitation push-pull output circuit 302; the first operational amplifier U1A' is connected to the second operational amplifier U1B', the first resistor R1', the second resistor R2', the capacitor C1', and the reference voltage VREF.

[0043] Specifically, the positive input terminal of the first operational amplifier U1A' is connected to the reference voltage VREF. The inverting input terminal of the first operational amplifier U1A' is connected to the resolver decoder chip 1 through the first resistor R1' to receive the excitation signal NEXC from the selector decoder chip. The inverting input terminal of the first operational amplifier U1A' is connected to the output terminal of the first operational amplifier U1A' through the second resistor R2'. The capacitor C1' is connected in parallel with the second resistor R2'. The output terminal of the first operational amplifier U1A' is connected to the positive input terminal of the second operational amplifier U1B'. The inverting input terminal and the output terminal of the second operational amplifier U1B' are connected to the excitation push-pull output circuit 302. This operational amplifier circuit 301 mainly amplifies and filters the weak excitation signal NEXC output by the resolver 5 to improve signal quality.

[0044] The push-pull output circuit 302 includes a third resistor R3', a fourth resistor R4', a fifth resistor R5', a sixth resistor R6', a seventh resistor R7', an eighth resistor R8', a first diode D1', a second diode D2', a first transistor Q1', and a second transistor Q2'. One end of the third resistor R3' is connected to the other end of the third resistor R3' via the fourth resistor R4', the first diode D1', the second diode D2', the fifth resistor R5', the sixth resistor R6', the second transistor Q2', the eighth resistor R8', the seventh resistor R7', and the first transistor Q1'. One end: The base of the first transistor Q1' is connected to the common connection point of the third resistor R3' and the fourth resistor R4'; the base of the second transistor Q2' is connected to the common connection point of the fifth resistor R5' and the sixth resistor R6'; the 12V supply voltage is connected to the common connection point of the collector of the first transistor Q1' and the third resistor R3'; the common connection point of the collector of the second transistor Q2' and the sixth resistor R6' is grounded; the second operational amplifier U1B' is connected to the common connection point of the first diode D1' and the second diode D2', and the common connection point of the seventh resistor R7' and the eighth resistor R8'.

[0045] Specifically, the first terminal of the seventh resistor R7' is connected to the first terminal of the eighth resistor R8'. The inverting input terminal of the second operational amplifier U1B' is connected to the common connection point of the seventh resistor R7' and the eighth resistor R8'. The output terminal of the second operational amplifier U1B' is connected to the cathode of the first diode D1' and the anode of the second diode D2'. The anode of the first diode D1' is connected to the first terminal of the fourth resistor R4'. The first terminal of the fourth resistor R4' is connected to the first terminal of the third resistor R3' and the first transistor Q1'. The base of the first transistor Q1' is connected to the base of the second transistor Q2'. The collector of the first transistor Q1' is connected to the 12V power supply. The emitter of the first transistor Q1' is connected to the second terminal of the seventh resistor R7'. The second terminal of the eighth resistor R8' is connected to the emitter of the second transistor Q2'. The cathode of the second diode D2' is connected to the first terminal of the fifth resistor R5'. The second terminal of the fifth resistor R5' is connected to the first terminal of the sixth resistor R6' and the base of the second transistor Q2'. The second terminal of the sixth resistor R6' and the collector of the second transistor Q2' share a common ground. This push-pull output circuit 302 is responsible for amplifying the signal processed by the operational amplifier circuit 301 to drive the rotary transformer 5 to work normally. At the same time, the push-pull output circuit 302 can enhance the output load capacity and save the cost of the decoding device.

[0046] In one embodiment of this utility model, the first operational amplifiers U1A and U1A' and the second operational amplifiers U1B and U1B' are all operational amplifiers of model LM324.

[0047] The signal conditioning module 4 includes a sine signal conditioning circuit 401 and a cosine signal conditioning circuit 402; the resolver decoding chip 1 is connected to the sine signal conditioning circuit 401 and the cosine signal conditioning circuit 402; and the rotary transformer 5 is connected to the sine signal conditioning circuit 401 and the cosine signal conditioning circuit 402.

[0048] See Figure 5 As shown, in one embodiment of this utility model, the sinusoidal signal conditioning circuit 401 includes a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11; the resolver decoding chip 1 is connected to the ninth resistor R9; the resolver 5 is connected to the tenth resistor R10 and the eleventh resistor R11; and the ninth resistor R9 is connected to the tenth resistor R10 and the eleventh resistor R11.

[0049] See Figure 6 As shown, in one embodiment of this utility model, the cosine signal conditioning circuit 402 includes a twelfth resistor R12, a thirteenth resistor R13, and a fourteenth resistor R14; the resolver decoding chip 1 is connected to the twelfth resistor R12; the resolver 5 is connected to the thirteenth resistor R13 and the fourteenth resistor R14; and the twelfth resistor R12 is connected to the thirteenth resistor R13 and the fourteenth resistor R14.

[0050] Control module 2 sends configuration commands to SC2161 chip (resolver decoder chip 1) via its SPI interface to set parameters such as excitation frequency and resolution; the programmable sine wave oscillator inside SC2161 chip (resolver decoder chip 1) generates excitation signal EXC / NEXC, which is amplified by operational amplifier circuit 301 and then output to resolver 5 by excitation push-pull output circuit 302.

[0051] Under the excitation signals EXC / NEXC, the rotary transformer 5 outputs a sine analog signal and a cosine analog signal containing position information. After receiving the signal output by the rotary transformer 5, the SC2161 chip (rotary transformer decoding chip 1) processes the signal through a servo loop. During the processing, the sine analog signal and the cosine analog signal are compared and phase-detected with the reference signal inside the SC2161 chip (rotary transformer decoding chip 1), and the sine / cosine analog signal is converted into a digital signal to obtain the position information and speed information of the rotary transformer 5.

[0052] The control module 2 reads the digital signal decoded by the SC2161 chip (resolver decoding chip 1) through its SPI interface, converts the position information in the digital signal from binary encoding into specific angle values, and converts the velocity information in the digital signal into units to obtain angular velocity, thereby improving the reliability, stability and accuracy of the decoding results.

[0053] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A rotary transformer decoding device, characterized in that, include: The SC2161 resolver decoder chip, control module, excitation amplification module, and signal conditioning module; The resolver decoding chip is connected to the control module, the excitation amplification module, and the signal conditioning module, and the resolver is connected to the excitation amplification module and the signal conditioning module; The excitation amplification module includes two excitation amplification units with identical structures. Each excitation amplification unit includes an operational amplifier circuit and an excitation push-pull output circuit. The operational amplifier circuit is connected to the resolver decoding chip and the excitation push-pull output circuit; the excitation push-pull output circuit is connected to the resolver. The operational amplifier circuit includes a first operational amplifier, a second operational amplifier, a first resistor, a second resistor, and a capacitor; The first resistor is connected to the resolver decoding chip; the second operational amplifier is connected to the excitation push-pull output circuit; the first operational amplifier is connected to the second operational amplifier, the first resistor, the second resistor, the capacitor, and the reference voltage. The excitation push-pull output circuit includes a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first diode, a second diode, a first transistor, and a second transistor; One end of the third resistor is connected to the other end of the third resistor in sequence through the fourth resistor, the first diode, the second diode, the fifth resistor, the sixth resistor, the second transistor, the eighth resistor, the seventh resistor, and the first transistor; The base of the first transistor is connected to the common connection point of the third and fourth resistors; the base of the second transistor is connected to the common connection point of the fifth and sixth resistors; the power supply voltage is connected to the common connection point of the collector of the first transistor and the third resistor; the common connection point of the collector of the second transistor and the sixth resistor is grounded. The second operational amplifier is connected to the common connection point of the first diode and the second diode, and the common connection point of the seventh resistor and the eighth resistor.

2. The rotary transformer decoding device according to claim 1, characterized in that, The signal conditioning module includes a sine signal conditioning circuit and a cosine signal conditioning circuit; The resolver decoding chip is connected to the sine signal conditioning circuit and the cosine signal conditioning circuit; the resolver is connected to the sine signal conditioning circuit and the cosine signal conditioning circuit.

3. The rotary transformer decoding device according to claim 2, characterized in that, The sinusoidal signal conditioning circuit includes a ninth resistor, a tenth resistor, and an eleventh resistor; The resolver decoding chip is connected to the ninth resistor; the resolver is connected to the tenth and eleventh resistors; and the ninth resistor is connected to the tenth and eleventh resistors.

4. The rotary transformer decoding device according to claim 2, characterized in that, The cosine signal conditioning circuit includes a twelfth resistor, a thirteenth resistor, and a fourteenth resistor; The resolver decoding chip is connected to the twelfth resistor; the resolver is connected to the thirteenth and fourteenth resistors; and the twelfth resistor is connected to the thirteenth and fourteenth resistors.

5. A rotary transformer decoding device according to claim 1, characterized in that, The first operational amplifier and the second operational amplifier are both LM324 operational amplifiers.

6. The rotary transformer decoding device according to claim 1, characterized in that, The control module includes a main control chip; the main control chip is connected to the resolver decoding chip.

7. A rotary transformer decoding device according to claim 6, characterized in that, The main control chip is an STM32F103C8T6 chip.

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