CN218238869U - Excitation signal source circuit for rotary transformer - Google Patents
Excitation signal source circuit for rotary transformer Download PDFInfo
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- CN218238869U CN218238869U CN202222183860.6U CN202222183860U CN218238869U CN 218238869 U CN218238869 U CN 218238869U CN 202222183860 U CN202222183860 U CN 202222183860U CN 218238869 U CN218238869 U CN 218238869U
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Abstract
The utility model discloses an excitation signal source circuit for resolver, include: the DC/DC converter converts direct current input voltage into two paths of same positive and negative voltages and provides power supply voltage for a post-stage sine wave signal generator and a linear power amplifier; a sine wave signal generator for outputting a low distortion sine wave signal; the linear power amplifier module is used for amplifying an input sine wave signal; the transformer comprises a primary side and two identical auxiliary transformers and outputs two paths of alternating-current voltages; and the fault detection circuit rectifies the primary voltage of the transformer and outputs a detection signal through optical coupling isolation. The utility model discloses in, the excitation signal source's of being convenient for stable supply reduces signal distortion, has realized the fault detection of excitation signal source, and the work investigation of being convenient for has improved work efficiency.
Description
Technical Field
The utility model relates to a resolver technical field especially relates to an excitation signal source circuit for resolver.
Background
The resolver is an electromagnetic sensor, also called a synchronous resolver, and is a small-sized ac motor for measuring angles, which is used to measure angular displacement and angular velocity of a rotating shaft of a rotating object and is composed of a stator and a rotor. The stator winding is used as the primary side of the transformer to receive the excitation voltage, the excitation frequency is usually 400 Hz, 3000 Hz, 5000Hz and the like, the rotor winding is used as the secondary side of the transformer to obtain the induction voltage through electromagnetic coupling, and an excitation signal is required to be provided for the rotor winding through an excitation signal source in the use process of the rotary transformer, however, most of the excitation signal source circuits for the rotary transformer in the prior art still have the defects: most of the existing excitation signal source circuits for the rotary transformer adopt external sine wave signals, faults are easy to occur during use, a fault self-detection circuit is not arranged, the using state of the circuit is inconvenient to detect in time, and fault troubleshooting is inconvenient to realize, so that the normal supply of the excitation signal source is influenced, and the working efficiency of the rotary transformer is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: the excitation signal source circuit for the rotary transformer is provided for solving the problems that most of the existing excitation signal source circuits for the rotary transformer adopt external sine wave signals, faults are easy to occur during use, a fault self-checking circuit is not arranged, the using state of the circuit is inconvenient to detect in time, the faults are inconvenient to check, and the normal supply of an excitation signal source is influenced to influence the working efficiency of the rotary transformer.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an excitation signal source circuit for a resolver, comprising:
the DC/DC converter converts direct current input voltage into two paths of same positive and negative voltages and provides power supply voltage for a post-stage sine wave signal generator and a linear power amplifier;
a sine wave signal generator for outputting a low distortion sine wave signal;
the linear power amplifier module is used for amplifying an input sine wave signal;
the transformer comprises a primary side and two identical secondary transformers and outputs two paths of alternating-current voltages;
the fault detection circuit rectifies the primary voltage of the transformer and outputs a detection signal through optical coupling isolation;
the input end of the DC/DC converter is connected with a +/-48V direct current input, the output end of the DC/DC converter is electrically connected with the input ends of the linear power amplification module and the sine wave signal generator respectively, the output end of the sine wave signal generator is electrically connected with the input end of the linear power amplification module, the output end of the linear power amplification module is electrically connected with the input ends of the transformer and the fault detection circuit respectively, and the transformer is used for double-path 26V/2000Hz alternating current output.
As a further description of the above technical solution:
the sine wave signal generator adopts an RC self-oscillation circuit, and can obtain sine waves meeting the requirements of frequency and distortion degree by adjusting the values of a resistor and a capacitor.
As a further description of the above technical solution:
the linear power amplifier module adopts two OPA549 linear power amplifiers to amplify sine wave signals and then outputs one path of alternating voltage through a transformer.
As a further description of the above technical solution:
the fault detection circuit outputs a high level (+ 4V to + 5V) when the fault detection circuit works normally, and outputs a low level (0 to + 1V) when the fault detection circuit does not output.
As a further description of the above technical solution:
the DC/DC converter adopts a forward converter.
As a further description of the above technical solution:
the fault detection circuit comprises a first triode and a second triode, wherein the base of the first triode is connected with one ends of a diode D1 anode, a diode D2 anode and a resistor R8, the other end of the resistor R8 is connected with the collector of the first triode and the base of the second triode through a resistor R6, the other end of the resistor R8 is connected with the collector of the second triode through a resistor R4, an output end is arranged between the resistor R4 and the second triode, and the emitting electrode of the first triode and the emitting electrode of the second triode are grounded together.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
the utility model discloses in, during the use, 48V direct current input obtains two the same positive negative voltages of tunnel through the DC/DC converter, wherein all the way through low distortion sine wave signal of sine wave signal generator output to linear power amplifier module, linear power amplifier module enlargies the sine wave signal of input, realize double-circuit 26V 2000Hz alternating current output through transformer effect, another way fault detection circuit of linear power amplifier module carries out the rectification with transformer primary voltage, output detected signal is kept apart to the rethread opto-coupler, normally work time output high level (+ 4V- + 5V), output low level (0- + 1V) when the trouble does not have the output, the fault detection of excitation signal source has been realized, the work investigation of being convenient for, and the work efficiency is improved.
Drawings
Fig. 1 shows a schematic structural diagram of an excitation principle provided according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a schematic structure of a DC/DC converter provided in accordance with an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a sine wave signal generator according to an embodiment of the present invention;
fig. 4 shows a schematic structural diagram of a linear power amplifier module provided according to an embodiment of the present invention;
fig. 5 shows a schematic structural diagram of a principle of a fault detection circuit provided according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.
Referring to fig. 1-5, the present invention provides a technical solution: an excitation signal source circuit for a resolver includes:
the DC/DC converter converts the direct current input voltage into two paths of same positive and negative voltages and provides power supply voltage for a post-stage sine wave signal generator and a linear power amplifier;
the sine wave signal generator is used for outputting a low-distortion sine wave signal;
the linear power amplifier module is used for amplifying the input sine wave signal;
the transformer comprises a primary side and two identical secondary transformers and outputs two paths of alternating-current voltages;
the fault detection circuit rectifies the primary voltage of the transformer and outputs a detection signal through optical coupling isolation;
the input end of the DC/DC converter is connected with +/-48V direct current input, the output end of the DC/DC converter is electrically connected with the input ends of the linear power amplification module and the sine wave signal generator respectively, the output end of the sine wave signal generator is electrically connected with the input end of the linear power amplification module, the output end of the linear power amplification module is electrically connected with the transformer and the input end of the fault detection circuit respectively, and the transformer is used for double-path 26V/2000Hz alternating current output.
Specifically, as shown in fig. 3, the sine wave signal generator employs an RC self-oscillation circuit, a sine wave meeting the requirements of frequency and distortion degree can be obtained by adjusting the values of a resistor and a capacitor, and a single power supply 48V is used for power input, so that a 20W sine signal, a self-test signal and an output detection signal can be output to the maximum.
Specifically, as shown in fig. 4, the linear power amplifier module employs two OPA549 linear power amplifiers to amplify the sine wave signal, and then outputs one path of ac voltage through the transformer, and the whole module shares two paths to generate two paths of completely isolated outputs.
Specifically, as shown in fig. 2, the DC/DC converter employs a forward converter.
Specifically, as shown in fig. 5, the fault detection circuit outputs a high level (+ 4V to + 5V) when the fault detection circuit normally works, and outputs a low level (0V to + 1V) when the fault detection circuit does not output, the fault detection circuit includes a first triode and a second triode, a base of the first triode is connected to an anode of a diode D1, an anode of a diode D2, and one end of a resistor R8, the other end of the resistor R8 is connected to a collector of the first triode and a base of the second triode through a resistor R6, the other end of the resistor R8 is connected to a collector of the second triode through a resistor R4, an output end is provided between the resistor R4 and the second triode, an emitter of the first triode and an emitter of the second triode are grounded, the first triode and the second triode are both NPN-type triodes of 8050, and the two triodes share an emitter, so that current amplification is realized, a collector dc power supply ensures that the triodes work in an amplification state, a collector load resistor R6 converts a change of the triode collector current into a voltage change, a base bias resistor R8 provides a working point for the amplification circuit, the diode is turned on in a reverse direction, and the fault detection circuit normally works, and outputs a high level (+ 4V to +1V when the fault detection circuit does not output (0V 5V + 1V).
The working principle is as follows: when the linear power amplifier is used, +/-48V direct current input obtains two paths of same positive and negative voltages through a DC/DC converter, one path of the positive and negative voltages outputs a low-distortion sine wave signal to the linear power amplifier module through the sine wave signal generator, the linear power amplifier module amplifies the input sine wave signal and realizes double-path 26V/2000Hz alternating current output through the action of a transformer, the other path of fault detection circuit of the linear power amplifier module rectifies the primary voltage of the transformer and outputs a detection signal through optical coupling isolation, a high level (+ 4V to + 5V) is output during normal work, and a low level (0 to + 1V) is output during no fault output.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (6)
1. An excitation signal source circuit for a resolver, comprising:
the DC/DC converter converts direct current input voltage into two paths of same positive and negative voltages and provides power supply voltage for a post-stage sine wave signal generator and a linear power amplifier;
a sine wave signal generator for outputting a low distortion sine wave signal;
the linear power amplifier module is used for amplifying an input sine wave signal;
the transformer comprises a primary side and two identical secondary transformers and outputs two paths of alternating-current voltages;
the fault detection circuit rectifies the primary voltage of the transformer and outputs a detection signal through optical coupling isolation;
the input end of the DC/DC converter is connected with a +/-48V direct current input, the output end of the DC/DC converter is electrically connected with the input ends of the linear power amplification module and the sine wave signal generator respectively, the output end of the sine wave signal generator is electrically connected with the input end of the linear power amplification module, the output end of the linear power amplification module is electrically connected with the input ends of the transformer and the fault detection circuit respectively, and the transformer is used for double-path 26V/2000Hz alternating current output.
2. The excitation signal source circuit for the rotary transformer according to claim 1, wherein the sine wave signal generator employs an RC self-oscillation circuit, and the sine wave signal generator can obtain a sine wave meeting the requirements of frequency and distortion degree by adjusting the values of a resistor and a capacitor.
3. The excitation signal source circuit for the rotary transformer of claim 1, wherein the linear power amplifier module adopts two OPA549 linear power amplifiers to amplify the sine wave signal, and then outputs an ac voltage through the transformer.
4. The excitation signal source circuit for a resolver according to claim 1, wherein the fault detection circuit outputs a high level (+ 4V to + 5V) when operating normally, and outputs a low level (0 to + 1V) when there is no fault output.
5. The excitation signal source circuit for a resolver according to claim 1, wherein the DC/DC converter is a forward converter.
6. The excitation signal source circuit for the rotary transformer according to claim 1, wherein the fault detection circuit comprises a first triode and a second triode, a base of the first triode is connected with an anode of the diode D1, an anode of the diode D2 and one end of a resistor R8, the other end of the resistor R8 is connected with a collector of the first triode and a base of the second triode through a resistor R6, the other end of the resistor R8 is connected with a collector of the second triode through a resistor R4, an output end is arranged between the resistor R4 and the second triode, and an emitter of the first triode and an emitter of the second triode are connected in common.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222183860.6U CN218238869U (en) | 2022-08-18 | 2022-08-18 | Excitation signal source circuit for rotary transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222183860.6U CN218238869U (en) | 2022-08-18 | 2022-08-18 | Excitation signal source circuit for rotary transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218238869U true CN218238869U (en) | 2023-01-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222183860.6U Active CN218238869U (en) | 2022-08-18 | 2022-08-18 | Excitation signal source circuit for rotary transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218238869U (en) |
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2022
- 2022-08-18 CN CN202222183860.6U patent/CN218238869U/en active Active
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