CN220964677U - Rotation-varying excitation circuit and double-end rotation-varying excitation circuit - Google Patents
Rotation-varying excitation circuit and double-end rotation-varying excitation circuit Download PDFInfo
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- CN220964677U CN220964677U CN202322327349.3U CN202322327349U CN220964677U CN 220964677 U CN220964677 U CN 220964677U CN 202322327349 U CN202322327349 U CN 202322327349U CN 220964677 U CN220964677 U CN 220964677U
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Abstract
The utility model discloses a rotary-transformation excitation circuit and a double-end rotary-transformation excitation circuit, which comprise an excitation signal generation circuit, an excitation signal current amplification circuit and a blocking capacitor circuit. The output end of the excitation signal generating circuit is connected with the input end of the excitation signal current amplifying circuit. The input end of the blocking capacitor circuit is connected with the output end of the excitation signal amplifying circuit and is used for isolating the direct current component in the excitation signal output by the excitation signal amplifying circuit. The DC component in the excitation signal is filtered through the characteristic that the DC blocking capacitor circuit is in AC blocking DC, and only the AC component in the excitation signal is transmitted to the rotary transformer. The negative influence of direct current on the rotary transformer is solved under the abnormal condition of the working condition of the rotary transformer, and the electric corrosion damage of the rotary transformer excitation winding is avoided.
Description
Technical Field
The utility model relates to the technical field of motor rotation control, in particular to a rotation-varying excitation circuit and a double-end rotation-varying excitation circuit.
Background
The rotary transformer is an electromagnetic sensor for measuring the angular displacement and angular speed of rotating shaft of rotating object, and is composed of stator and rotor. Wherein the stator winding is used as the primary side of the transformer and receives the exciting voltage. The rotor winding is used as the secondary side of the transformer, the induction voltage is obtained through electromagnetic coupling, and the output voltage changes along with the rotor rotation angle. The rotary transformer is installed on the motor, and the rotary transformer excitation circuit is used for providing sine excitation signals for the rotary transformer, and the motor rotating speed and angle are measured by analyzing the signals fed back by the rotary transformer.
Currently, the excitation signal generated by the rotary excitation circuit has a direct current component. When the rotary enameled wire is abnormal in insulation and has a skin breaking condition, and the rotary magnetic core is grounded, the direct current with power output can cause the rotary excitation winding in the rotary transformer to have the problem of electric corrosion damage.
Disclosure of utility model
Based on the above problems, the present utility model provides a spin-on excitation circuit and a double-ended spin-on excitation circuit to reduce the possibility of electrical corrosion damage.
The embodiment of the utility model discloses the following technical scheme:
In a first aspect, the present utility model provides a spin-on excitation circuit comprising: an excitation signal generating circuit, an excitation signal current amplifying circuit and a blocking capacitor circuit;
the output end of the excitation signal generation circuit is connected with the input end of the excitation signal current amplification circuit;
The input end of the blocking capacitor circuit is connected with the output end of the excitation signal current amplifying circuit and is used for isolating the direct current component in the excitation signal output by the excitation signal current amplifying circuit;
the excitation signal current amplifying circuit comprises a current detecting resistor, a first push-pull triode and a second push-pull triode;
And the emitter of the first push-pull triode and the emitter of the second push-pull triode are respectively connected with two ends of the current detection resistor.
Optionally, the excitation signal current amplifying circuit further includes: a first protection triode and a second protection triode;
The collector electrode and the base electrode of the first protection triode are respectively connected with the base electrode and the emitter electrode of the first push-pull triode; the emitter of the first protection triode is connected with the emitter of the second protection triode;
and the collector electrode and the base electrode of the second protection triode are respectively connected with the base electrode and the emitter electrode of the second push-pull triode.
Optionally, the dc blocking capacitance circuit includes two capacitors connected in parallel.
Optionally, the excitation signal generating circuit comprises an excitation signal acquisition circuit, a direct current bias generating circuit and an operational amplifier circuit;
One end of the excitation signal acquisition circuit is connected with an original excitation signal, and the other end of the excitation signal acquisition circuit is connected with a first input end of the operational amplifier circuit;
The DC bias generating circuit is connected with the second output end of the operational amplifier circuit, and the output end of the operational amplifier circuit is connected with the input end of the excitation signal current amplifying circuit.
Optionally, the circuit further comprises an excitation signal voltage amplifying circuit;
And two ends of the excitation signal voltage amplifying circuit are respectively connected with the first input end of the operational amplifier circuit and the output end of the excitation signal current amplifying circuit.
Optionally, the circuit further comprises an interface protection circuit;
One end of the interface protection circuit is connected with the blocking capacitor circuit, and the other end of the interface protection circuit outputs an excitation signal.
Optionally, the interface protection circuit includes an EMI filter capacitor, an EMS protection TVS, and a common mode inductance;
The EMI filter capacitor, the EMS protection TVS and the common mode inductor are sequentially connected.
Optionally, the current detection resistor comprises two groups of parallel resistors connected in series, and the parallel resistors comprise two resistors connected in parallel.
Optionally, the EMI filter capacitor comprises two capacitors connected in parallel.
In a second aspect, the present utility model provides a double-ended rotation-varying excitation circuit, which is characterized by comprising two rotation-varying excitation circuits according to the first aspect.
Compared with the prior art, the utility model has the following beneficial effects:
The utility model provides a rotation-varying excitation circuit and a double-end rotation-varying excitation circuit. The DC component in the excitation signal is filtered through the characteristic that the DC blocking capacitor circuit is in AC blocking DC, and only the AC component in the excitation signal is transmitted to the rotary transformer. The negative influence of direct current on the rotary transformer is solved under the abnormal condition of the working condition of the rotary transformer, and the electric corrosion damage of the rotary transformer excitation winding is weakened.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of a spin-on excitation circuit provided by the present utility model;
FIG. 2 is a schematic diagram of a second embodiment of a gyratory excitation circuit according to the present utility model;
FIG. 3 is a third schematic diagram of the spin-on excitation circuit according to the present utility model;
FIG. 4 is a schematic diagram of a gyratory excitation circuit according to the present utility model;
FIG. 5 is a schematic diagram of a gyratory excitation circuit according to the present utility model;
FIG. 6 is a schematic diagram of a gyratory excitation circuit according to the present utility model;
FIG. 7 is a schematic diagram of a spin-on excitation circuit according to the present utility model;
FIG. 8 is a schematic diagram of a spin-on excitation circuit according to the present utility model;
FIG. 9 is a topology of a spin-on excitation circuit provided by the present utility model;
Fig. 10 is a topology diagram of a double-ended rotary excitation circuit provided by the utility model.
Detailed Description
In order to make the present utility model better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, fig. 1 is a schematic diagram of a gyratory excitation circuit provided by the utility model.
Referring to fig. 1, the spin-on excitation circuit provided by the present utility model includes:
An excitation signal generation circuit 10, an excitation signal current amplification circuit 20, and a blocking capacitance circuit 30;
The output end of the excitation signal generation circuit 10 is connected with the input end of the excitation signal current amplification circuit 20; the input end of the blocking capacitor circuit 30 is connected with the output end of the excitation signal current amplifying circuit 20.
The excitation signal generation circuit 10 may generate the excitation signal so that the excitation signal is processed by the subsequent-stage excitation-signal current amplification circuit.
The excitation signal current amplifying circuit 20 amplifies the current of the excitation signal after receiving the excitation signal.
The blocking capacitance circuit 30 is used to isolate the dc component of the excitation signal output from the excitation signal current amplifying circuit 20.
When the direct current component flows through the rotary transformer, the direct current component can cause water stains in the rotary transformer to generate electrolysis to generate oxygen. Oxygen reacts with the rotary excitation winding in the rotary transformer in an oxidation way to corrode the rotary excitation winding. Therefore, the dc component of the excitation signal is isolated by the dc blocking capacitance circuit 30, and the probability of occurrence of electrolytic corrosion damage can be reduced to some extent.
The utility model provides a rotary-transformer excitation circuit which comprises an excitation signal generation circuit, an excitation signal current amplification circuit and a blocking capacitor circuit. The DC component in the excitation signal is filtered through the characteristic that the DC blocking capacitor circuit is in AC blocking DC, and only the AC component in the excitation signal is transmitted to the rotary transformer. The negative influence of direct current on the rotary transformer is solved under the abnormal condition of the working condition of the rotary transformer, and the electric corrosion damage of the rotary transformer excitation winding is avoided.
In one possible implementation, as shown in fig. 2, the excitation signal current amplifying circuit 20 includes a current detection resistor R0, a first push-pull transistor Q1, and a second push-pull transistor Q2.
The emitter of the first push-pull triode Q1 and the emitter of the second push-pull triode Q2 are respectively connected with two ends of the current detection resistor R0. The current detection resistor R0 is formed by connecting two groups of parallel resistors in series. As shown in fig. 2, parallel connection of R11 and R12 and parallel connection of R13 and R14 are connected in series, and a common terminal of the current detection resistor R0, R13 and R14 is connected with the blocking capacitor circuit.
The collector of the first push-pull triode Q1 is connected with a 12V power supply and one end of R15, the emitter is connected with the common end of R11 and R12, and the base is connected with the other end of R15 and one end of R16.
The collector of the second push-pull transistor Q2 is grounded and connected to one end of R18, the emitter is connected to the common terminal of R13 and R14, and the base is connected to the other end of R18 and one end of R17.
The current of the excitation signal is amplified by controlling the on and off of the Q1 and the Q2 through a push-pull circuit formed by the first push-pull triode Q1 and the second push-pull triode Q2 until the rated working current of the spin transformer is met, and then the output driving capability of the excitation signal is improved.
The current detection resistor R0 is used for turning off the first push-pull triode Q1 and the second push-pull triode Q2 when overcurrent occurs in the circuit, and protecting the first push-pull triode Q1 and the second push-pull triode Q2.
The transistor in this embodiment may be an Insulated Gate bipolar transistor (Insulated Gate BipolarTransistor, IGBT) or a metal-oxide semiconductor field effect transistor MOSFET, which is not limited in this utility model.
In one possible implementation, as shown in fig. 3, the excitation signal current amplifying circuit further includes a first protection transistor Q3 and a second protection transistor Q4.
The collector electrode and the base electrode of the first protection triode Q3 are respectively connected with the base electrode and the emitter electrode of the first push-pull triode Q1; the emitter of the first protection triode Q3 is connected with the emitter of the second protection triode Q4.
The collector and base of the second protection triode Q4 are respectively connected with the base and emitter of the second push-pull triode Q2.
An R19 is connected in series between the base of the first push-pull transistor Q1 and the collector of the first protection transistor Q3. And R20 is connected in series between the collector of the second protection triode Q4 and the base of the second push-pull triode Q2.
When overcurrent occurs in the spin-to-drive circuit, the first protection triode Q3 and the second protection triode Q4 are in a conducting state, and the first push-pull triode Q1 and the second push-pull triode Q2 are in a cutting-off state. At this time, the first protection transistor Q3 and the second protection transistor Q4 play a role in current limiting, and protect the first push-pull transistor Q1 and the second push-pull transistor Q2.
When the resistors R11, R12, R13 and R14 are 10 Ω current detection resistors, the series-parallel connection is followed by a 5 Ω current detection resistor R0. The overcurrent protection current imax=1.2/5=0.24A, according to the transistor saturated conduction typical value of 1.2V. When the current is greater than or equal to 0.24A typical value, Q3 and Q4 are conducted, signals are output before passing through the blocking capacitor, alternating current sinusoidal signals of the upper triode and the lower triode cannot be conducted in a crossing mode, the signals become direct current signals with irregular amplitude changes, and all the signals are positive values.
In one possible implementation, as shown in fig. 4, the dc blocking capacitance circuit 30 includes two capacitances, C1 and C2, in parallel.
Referring to fig. 4, a capacitor C1 and a capacitor C2 are connected in parallel to the excitation signal current amplifying circuit 20.
Since the direct current component exists in the excitation signal, the direct current component in the excitation signal is correspondingly amplified after the excitation signal passes through the excitation signal current amplifying circuit 20. By utilizing the characteristic that the capacitor is connected with alternating current and is blocked from direct current, the amplified direct current component is filtered through the capacitor C1 and the capacitor C2 which are connected in parallel, so that the alternating current component in the excitation signal passes through. Thereby achieving the effect of reducing the possibility of electric corrosion damage.
In addition, when the overcurrent is not detected by the current detection resistor R0, the first protection transistor Q3 and the second protection transistor Q4 are in an off state. At this time, the dc blocking capacitance circuit 30 isolates the dc component in the excitation signal and allows only the ac component to pass. Since the ac component of the excitation signal is typically lower than the dc component, isolating the dc component and allowing only the ac component to pass through may reduce the electrochemical corrosion of the rotating excitation winding to some extent.
When the overcurrent is detected by the current detection resistor R0, the first protection transistor Q3 and the second protection transistor Q4 are in a conductive state. At this time, the ac component in the excitation signal is converted into a dc component by the first protection transistor Q3 and the second protection transistor Q4, and is also passed by the dc blocking capacitor circuit 30, so that the ac component and the dc component in the excitation signal cannot pass through, and electrochemical corrosion to the rotary excitation winding is reduced.
The current amplifying circuit 20 and the blocking capacitance circuit 30 are energized by an excitation signal. When no overcurrent condition occurs, the direct current component in the excitation signal is isolated, so that the electrochemical corrosion of the rotary excitation winding is reduced. When the overcurrent condition occurs, namely the working condition of ground short circuit or line short circuit occurs, the alternating current excitation signal is subjected to wave sealing, and the alternating current signal is converted into a triode Vbesat fixed level signal, so that the blocking of alternating current components and direct current components is realized, and the electrochemical corrosion to the variable excitation winding is further reduced.
In one possible implementation, as shown in fig. 5, the excitation signal generation circuit includes an excitation signal acquisition circuit 11, a dc bias generation circuit 12, and an operational amplifier circuit 13.
One end of the excitation signal acquisition circuit 11 is connected with an original excitation signal, and the other end is connected with a first input end of the operational amplifier circuit 13.
The dc bias generating circuit 12 is connected to the second output terminal of the operational amplifier circuit, and the output terminal of the operational amplifier circuit 13 is connected to the input terminal of the excitation signal current amplifying circuit 20.
The excitation signal acquisition circuit 11 is configured to acquire an original excitation signal and transmit the original excitation signal to the operational amplifier circuit 13.
The dc bias generation circuit 12 is configured to generate a dc bias voltage.
The original excitation signal is sinusoidal, and clipping and distortion may occur if the original excitation signal is directly current amplified. Therefore, a dc offset generating circuit is added to the input end of the operational amplifier circuit 20 to increase the dc offset voltage for the original excitation signal, thereby reducing the possibility of clipping and distortion after the excitation signal is amplified.
In one possible implementation, see fig. 6. The excitation signal acquisition circuit 11 acquires an original excitation signal EXC, and is connected to a first input terminal of the operational amplifier circuit 13 through R21.
The direct current bias generating circuit comprises R22 and R23 which are connected in series, and the resistance value of R22 is the same as that of R23. The common terminal of R22 and R23 is connected to the second input terminal of the op-amp circuit 13. One end of the capacitor C3 is grounded, the other end of the capacitor C3 is connected with the common end of the R22 and the R23, and the capacitor C3 is used for direct current bias filtering. The 12V voltage is converted to a 6V dc bias voltage by R22 and R23 in series.
The operational amplifier circuit 13 adjusts the amplitude of the voltage of the original excitation signal by using the dc bias voltage. Thereby reducing the likelihood of clipping and distortion after amplification of the excitation signal.
In one possible implementation, referring to fig. 7, the circuit further includes an excitation signal voltage amplifying circuit 40.
The two ends of the excitation signal voltage amplifying circuit 40 are respectively connected with the first input end of the operational amplifier circuit 13 and the output end of the excitation signal acquisition circuit 11.
The excitation signal voltage amplifying circuit 40 is used for amplifying the voltage of the original excitation signal to meet the rated rotation rated working voltage, and feeding back the voltage through connecting with the output end of the excitation signal acquisition circuit 11.
In one possible implementation, referring to fig. 8, the spin-on excitation circuit further includes an interface guard circuit 50.
One end of the interface protection circuit 50 is connected to the blocking capacitance circuit 30, and the other end outputs excitation signals EXC-and exc+.
It will be appreciated that the output of the interface guard circuit is connected to a rotary excitation winding in the rotary transformer. The resolver may operate according to the excitation signal after receiving the excitation signal.
The interface protection circuit 50 can isolate dangerous signals outside to a certain extent, prevent external interference signals from entering the circuit, thereby causing damage to the circuit and reducing the influence of the outside on the normal operation of the circuit.
In one possible implementation, referring to fig. 9, the interface protection circuit 50 includes an EMI filter capacitor 51, an EMS protection TVS52, and a common mode inductance 53.
The EMI filter capacitor 51, the EMS protection TVS52 and the common mode inductor 53 are connected in sequence. The EMI filter capacitor 51 acquires the excitation signals filtered by the blocking capacitor circuit 30, the common-mode inductor 53 outputs excitation signals EXC-and EXC+, and the excitation signals EXC-and EXC+ are connected to the induction coil, so that corrosion is reduced while protection of the induction coil is realized.
The EMI filter capacitor 51 is formed by connecting a capacitor C5 and a capacitor C6 in parallel, and is used for filtering electromagnetic interference.
The EMS protective TVS52 is composed of two diodes and two voltage regulators D2 for suppressing transient pulses.
The common-mode inductor 53 (L1) is used to filter out common-mode interference on the differential lines.
The embodiment is a single-ended spin-conversion excitation circuit provided by the utility model, and is used for realizing the output of a single-ended common mode excitation signal. Correspondingly, the utility model also provides a double-end rotary-transformer excitation circuit, which consists of two rotary-transformer excitation circuits. When the interference signals exist, the same interference can be generated on the excitation signals at the two ends, and the interference signals are mutually offset through the difference between the two excitation signals, so that the effective input of the interference signals is zero, and common-mode interference resistance is realized.
As shown in fig. 10, fig. 10 is a schematic diagram of a dual-end gyratory excitation circuit according to the present utility model. The double-end rotation-varying excitation circuit comprises two rotation-varying excitation circuits, a first rotation-varying excitation circuit and a second rotation-varying excitation circuit. The output end of the first rotary-transformation excitation circuit and the output end of the second rotary-transformation excitation circuit are connected with the same rotary-transformation excitation winding.
The difference with the single-end rotation-transformation excitation circuit is that the double-end rotation-transformation excitation circuit comprises two groups of blocking capacitance circuits, and one rotation-transformation excitation circuit corresponds to each other; and the EMI filter capacitor is formed by connecting three capacitors in parallel.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A gyratory excitation circuit, comprising: an excitation signal generating circuit, an excitation signal current amplifying circuit and a blocking capacitor circuit;
the output end of the excitation signal generation circuit is connected with the input end of the excitation signal current amplification circuit;
The input end of the blocking capacitor circuit is connected with the output end of the excitation signal current amplifying circuit and is used for isolating the direct current component in the excitation signal output by the excitation signal current amplifying circuit;
the excitation signal current amplifying circuit comprises a current detecting resistor, a first push-pull triode and a second push-pull triode;
And the emitter of the first push-pull triode and the emitter of the second push-pull triode are respectively connected with two ends of the current detection resistor.
2. The circuit of claim 1, wherein the excitation signal current amplifying circuit further comprises: a first protection triode and a second protection triode;
The collector electrode and the base electrode of the first protection triode are respectively connected with the base electrode and the emitter electrode of the first push-pull triode; the emitter of the first protection triode is connected with the emitter of the second protection triode;
and the collector electrode and the base electrode of the second protection triode are respectively connected with the base electrode and the emitter electrode of the second push-pull triode.
3. A circuit according to any one of claims 1 or 2, wherein the dc blocking capacitance circuit comprises two capacitors connected in parallel.
4. The circuit of claim 3, wherein the excitation signal generation circuit comprises an excitation signal acquisition circuit, a dc bias generation circuit, and an operational amplifier circuit;
One end of the excitation signal acquisition circuit is connected with an original excitation signal, and the other end of the excitation signal acquisition circuit is connected with a first input end of the operational amplifier circuit;
The DC bias generating circuit is connected with the second output end of the operational amplifier circuit, and the output end of the operational amplifier circuit is connected with the input end of the excitation signal current amplifying circuit.
5. The circuit of claim 4, further comprising an excitation signal voltage amplifying circuit;
And two ends of the excitation signal voltage amplifying circuit are respectively connected with the first input end of the operational amplifier circuit and the output end of the excitation signal current amplifying circuit.
6. The circuit of claim 1, wherein the circuit further comprises an interface protection circuit;
One end of the interface protection circuit is connected with the blocking capacitor circuit, and the other end of the interface protection circuit outputs an excitation signal.
7. The circuit of claim 6, wherein the interface protection circuit comprises an EMI filter capacitor, an EMS protection TVS, and a common mode inductance;
The EMI filter capacitor, the EMS protection TVS and the common mode inductor are sequentially connected.
8. The circuit of claim 1, wherein the current sensing resistor comprises two sets of parallel resistors in series, the parallel resistors comprising two resistors in parallel.
9. The circuit of claim 7, wherein the EMI filter capacitor comprises two capacitors connected in parallel.
10. A double-ended gyratory exciter circuit comprising two gyratory exciter circuits according to any one of claims 1 to 9, a first gyratory exciter circuit and a second gyratory exciter circuit;
The output end of the first rotary excitation circuit and the output end of the second rotary excitation circuit are connected with the same rotary excitation winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322327349.3U CN220964677U (en) | 2023-08-28 | 2023-08-28 | Rotation-varying excitation circuit and double-end rotation-varying excitation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322327349.3U CN220964677U (en) | 2023-08-28 | 2023-08-28 | Rotation-varying excitation circuit and double-end rotation-varying excitation circuit |
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| Publication Number | Publication Date |
|---|---|
| CN220964677U true CN220964677U (en) | 2024-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322327349.3U Active CN220964677U (en) | 2023-08-28 | 2023-08-28 | Rotation-varying excitation circuit and double-end rotation-varying excitation circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220964677U (en) |
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2023
- 2023-08-28 CN CN202322327349.3U patent/CN220964677U/en active Active
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