CN110739914A - Rotary transformer excitation circuit based on sine wave - Google Patents
Rotary transformer excitation circuit based on sine wave Download PDFInfo
- Publication number
- CN110739914A CN110739914A CN201910956349.5A CN201910956349A CN110739914A CN 110739914 A CN110739914 A CN 110739914A CN 201910956349 A CN201910956349 A CN 201910956349A CN 110739914 A CN110739914 A CN 110739914A
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- China
- Prior art keywords
- band
- pass filter
- signals
- square wave
- power amplifier
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B28/00—Generation of oscillations by methods not covered by groups H03B5/00 - H03B27/00, including modification of the waveform to produce sinusoidal oscillations
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P13/00—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Theoretical Computer Science (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
The invention discloses a rotary transformer excitation circuit based on sine waves, which comprises a square wave generating circuit, a band-pass filter and a power amplifier, wherein the square wave generating circuit generates square wave signals and inputs the square wave signals into the band-pass filter, the band-pass filter adopts a second-order active band-pass filter, the band-pass filter filters frequency band signals except for central frequency and outputs sine wave signals to the power amplifier, and the power amplifier amplifies the sine wave signals and outputs excitation signals; the excitation circuit has the advantages of simple structure, high stability, small waveform distortion, small influence of ambient temperature and high signal frequency.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to an type rotary transformer excitation circuit based on sine waves.
Background
The resolver is used as a passive element and must be driven by adding a specific sinusoidal signal at an excitation end of the resolver, and for an angle measuring system taking the resolver as a sensor, the excitation signal is just like a heart , the generator is a generator for normal operation of the whole system, and the quality of the signal index directly influences the angle measuring performance of the system.
In recent years, with the development of packaging technology, analog integrated circuits capable of generating waveforms have appeared. A small number of resistor-capacitor devices are arranged on the periphery of the device to generate signals. Although the stability of the excitation signal generated by the analog integrated circuit is improved, the performance of the excitation signal can not meet the requirement in the occasion with severe temperature environment, and the special excitation module has good stability and is less influenced by the environment temperature, but the price is very expensive.
Disclosure of Invention
The invention aims to provide types of sine-wave-based resolver excitation circuits which have the advantages of simple structure, high stability, small waveform distortion degree, small influence of environmental temperature and high signal frequency.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the resolver excitation circuit based on the sine wave comprises a square wave generating circuit, a band-pass filter and a power amplifier, wherein the square wave generating circuit generates square wave signals and inputs the square wave signals into the band-pass filter, the band-pass filter adopts a second-order active band-pass filter, the band-pass filter filters frequency band signals except for central frequency and outputs sine wave signals to the power amplifier, and the power amplifier amplifies the sine wave signals and outputs excitation signals.
The invention has the advantages that the band-pass filter and the power amplifier are adopted to form sine wave signals, the circuit principle is simple, the cost is low, the requirement of wide-range temperature environment can be met, and the excitation circuit is stable and reliable excitation circuits of the rotary transformer.
Drawings
The invention is further illustrated in with reference to the following figures and examples:
FIG. 1 is an electrical block diagram of the present invention;
figure 2 is a circuit schematic of the bandpass filter of the present invention.
Detailed Description
As shown in FIG. 1, the invention provides a resolver excitation circuit based on a sine wave, which comprises a square wave generating circuit 1, a band-pass filter 4 and a power amplifier 5, wherein the square wave generating circuit 1 comprises a frequency divider 2, the frequency divider 2 is powered by a 5V power supply, an oscillator 3 inputs an active crystal oscillator to the frequency divider 2, so that the square wave generating circuit 1 generates a square wave signal, the square wave signal is input to the band-pass filter 4, the band-pass filter 4 adopts a second-order active band-pass filter as shown in FIG. 2, and specifically comprises an operational amplifier N1, resistors R1, R2 and R638, capacitors C1 and C2, a resistor R1 is connected in series with a capacitor C2 and then connected with an inverting input end of the operational amplifier N1, a resistor R2 is connected with a common end of the resistor R1 and the capacitor C2, another is grounded, a end of the capacitor C1 is connected with a common end of the resistor R1 and the capacitor C2 and an output end of the operational amplifier N5928, another end of the operational amplifier R3 is connected with an inverting input end of the operational amplifier N84.
Fig. 2 shows the simplest active filter circuits for implementing a second-order band-pass filter, which is called an infinite gain multi-terminal feedback circuit (MFB) because this circuit has two feedback branches C1 and R3, and the operational amplifier N1 is used as infinite gain devices, in which the capacitors C1 and C2 are arbitrary values and typically selects capacitors C1 and C2 to be a nominal value of approximately 10/fc uF.
When the capacitances C1 and C2 are selected and C1= C2= C, the calculation formula of each resistance value is as follows:
wherein
、
、
、
；
K in the formula is the gain of the second-order filter; f0 is the center frequency of the second order filter. The band-pass filter 4 filters out frequency band signals except the center frequency and outputs sine wave signals to the power amplifier 5, and the power amplifier 5 amplifies the sine wave signals and outputs excitation signals.
The band-pass filter 4 has less temperature drift and direct current component, and the distortion degree of the output waveform is low. The power amplifier 5 is used for improving the driving capability of the output driving source, and the stability of the output signal is good.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention.
Claims (1)
1. The resolver excitation circuit based on the sine wave is characterized by comprising a square wave generating circuit, a band-pass filter and a power amplifier, wherein the square wave generating circuit generates square wave signals and inputs the square wave signals into the band-pass filter, the band-pass filter adopts a second-order active band-pass filter, the band-pass filter filters frequency band signals except for the center frequency and outputs sine wave signals to the power amplifier, and the power amplifier amplifies the sine wave signals and outputs excitation signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910956349.5A CN110739914A (en) | 2019-10-10 | 2019-10-10 | Rotary transformer excitation circuit based on sine wave |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910956349.5A CN110739914A (en) | 2019-10-10 | 2019-10-10 | Rotary transformer excitation circuit based on sine wave |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110739914A true CN110739914A (en) | 2020-01-31 |
Family
ID=69268649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910956349.5A Withdrawn CN110739914A (en) | 2019-10-10 | 2019-10-10 | Rotary transformer excitation circuit based on sine wave |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110739914A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114629738A (en) * | 2020-12-14 | 2022-06-14 | 中国石油化工股份有限公司 | Rotary guide single bus transmission control device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946225A (en) * | 2012-10-18 | 2013-02-27 | 中国兵器工业集团第二一四研究所苏州研发中心 | Exciting circuit for rotating transformer |
-
2019
- 2019-10-10 CN CN201910956349.5A patent/CN110739914A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946225A (en) * | 2012-10-18 | 2013-02-27 | 中国兵器工业集团第二一四研究所苏州研发中心 | Exciting circuit for rotating transformer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114629738A (en) * | 2020-12-14 | 2022-06-14 | 中国石油化工股份有限公司 | Rotary guide single bus transmission control device |
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| PB01 | Publication | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200131 |
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| WW01 | Invention patent application withdrawn after publication |