CN211457089U - Amplifying circuit of rotary-change excitation signal and electronic equipment - Google Patents
Amplifying circuit of rotary-change excitation signal and electronic equipment Download PDFInfo
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- CN211457089U CN211457089U CN201922369364.8U CN201922369364U CN211457089U CN 211457089 U CN211457089 U CN 211457089U CN 201922369364 U CN201922369364 U CN 201922369364U CN 211457089 U CN211457089 U CN 211457089U
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Abstract
The application provides an amplifying circuit and electronic equipment of a rotary-change excitation signal, the circuit at least comprises a voltage amplifying circuit and a current amplifying circuit, the input end of the voltage amplifying circuit is connected with an excitation signal source, the output end of the voltage amplifying circuit is connected with the input end of the current amplifying circuit, the output end of the current amplifying circuit is connected with the input end of a rotary transformer, and the base electrode of a first amplifying triode, the collector electrode of a first protection triode and the base electrode of a second amplifying triode are all connected to the input end of the current amplifying circuit; the collector of the first amplifying triode is connected with a power supply, and the emitter of the first amplifying triode is respectively connected with the base of the first protection triode and one end of the first resistor; the other end of the first resistor, the emitter of the first protection triode and the emitter of the second amplification triode are all connected to the output end of the current amplification circuit. By implementing the application, the function of short-circuit protection of the output end can be realized, and the safety of the rotary transformer excitation signal amplifying circuit is improved.
Description
Technical Field
The utility model belongs to the technical field of the electric machine control and specifically relates to a become excitation signal's amplifier circuit and electronic equipment soon.
Background
The resolver is short for a resolver, and a resolver excitation signal can be understood as an excitation signal of the resolver. The rotary transformer is a small alternating current motor used for measuring angular displacement and angular velocity of a rotating object, when the rotary transformer works normally, an external excitation signal is needed to drive an excitation winding of the rotary transformer, and a rotary excitation signal needs to be amplified and then input to the rotary transformer.
In the prior art, the voltage amplification of the rotary transformer excitation signal is realized by an operational amplifier, the current amplification is realized by a push-pull circuit, and the problem of low safety in the prior art is not solved.
SUMMERY OF THE UTILITY MODEL
Based on foretell problem, the utility model provides a become excitation signal's amplifier circuit soon protects the amplifier triode through increasing the protection triode, when becoming excitation signal's amplifier circuit's output and taking place the short circuit condition soon, can realize exporting short-circuit protection's function, has improved and has become excitation signal amplifier circuit's security soon.
In a first aspect, an embodiment of the present application provides an amplifying circuit of a resolver excitation signal, the amplifying circuit of the resolver excitation signal includes at least one sub-amplifying circuit of the resolver excitation signal, the sub-amplifying circuit of the resolver excitation signal includes a voltage amplifying circuit and a current amplifying circuit, an input end of the voltage amplifying circuit is connected to an excitation signal source, an output end of the voltage amplifying circuit is connected to an input end of the current amplifying circuit, an output end of the current amplifying circuit is connected to an input end of a resolver, the current amplifying circuit includes a first amplifying triode, a second amplifying triode, a first protection triode, and a first resistor, where:
the base electrode of the first amplifying triode, the collector electrode of the first protection triode and the base electrode of the second amplifying triode are connected to the input end of the current amplifying circuit; a collector electrode of the first amplifying triode is connected with a power supply, and an emitter electrode of the first amplifying triode is respectively connected with a base electrode of the first protection triode and one end of the first resistor;
the other end of the first resistor, the emitter of the first protection triode and the emitter of the second amplification triode are all connected to the output end of the current amplification circuit, and the collector of the second amplification triode is connected with the ground.
Further, the current amplifying circuit further includes a second protection transistor and a second resistor, wherein:
the collector of the second protection triode is connected to the input end of the current amplification circuit, the base of the second protection triode is connected with one end of the second resistor, and the other end of the second resistor and the emitter of the second protection triode are connected to the output end of the current protection circuit.
In a possible embodiment, the amplification circuit of the rotated excitation signal comprises two sub-amplification circuits of the rotated excitation signal;
the input ends of the sub-amplifying circuits of the two rotary-change excitation signals are respectively connected with two excitation signal sources, and the phase difference of the excitation signals output by the two excitation signal sources is 180 degrees.
Optionally, the amplification circuit of the revolutionary excitation signal further includes a differential mode interference suppression circuit, where the differential mode interference suppression circuit is between output ends of the sub-amplification circuits of the two revolutionary excitation signals.
In one possible implementation, the differential mode interference suppression circuit includes a first capacitor, a third resistor, and a second capacitor, where:
one end of the first capacitor is connected with the output end of one of the sub-amplification circuits of the rotary-change excitation signal, the other end of the first capacitor is connected with one end of the third resistor, and the other end of the third resistor is connected with the output end of the other sub-amplification circuit of the rotary-change excitation signal.
Furthermore, the sub-amplifying circuit of the rotary-change excitation signal further comprises a third capacitor;
the output end of the current amplification circuit is connected with the input end of the rotary transformer, and the current amplification circuit comprises:
and the output end of the current amplification circuit is connected with the rotary transformer through the third capacitor.
In a possible embodiment, the current amplifying circuit further includes a first diode, a second diode, a fourth resistor, and a fifth resistor;
the base of the first amplifying triode, the collector of the first protection triode and the base of the second amplifying triode are all connected to the input end of the current amplifying circuit, and the current amplifying circuit comprises:
a connection point of a base electrode of the first amplifying triode and a collector electrode of the first protection triode is connected with a connection point of an anode of the first diode and one end of the fourth resistor, a cathode of the first diode is connected with an input end of the current amplifying circuit, and the other end of the fourth resistor is connected with a power supply;
the base electrode of the second amplifying triode is connected with the cathode of the second diode and the connection point of one end of the fifth resistor, the anode of the second diode is connected with the input end of the current amplifying circuit, and the other end of the fifth resistor is connected with the ground.
Optionally, the current amplifying circuit further includes a fifth capacitor and a sixth capacitor, where:
one end of the fifth capacitor is connected with the power supply, and the other end of the fifth capacitor is respectively connected with the base electrode of the first amplifying triode, the collector electrode of the first protection triode and the anode of the first diode;
one end of the sixth capacitor is connected with the base electrode of the second amplifying triode and the cathode of the second diode respectively, and the other end of the sixth capacitor is connected with the ground.
In one possible implementation manner, the voltage amplifying circuit includes a first operational amplifier, a sixth resistor, a seventh resistor, and a fourth capacitor, where:
one end of the sixth resistor is connected to the input end of the voltage amplifying circuit, and the other end of the sixth resistor is respectively connected to the inverting input end of the first operational amplifier, one end of the fourth capacitor and one end of the seventh resistor;
the other end of the fourth capacitor is connected with the other end of the seventh resistor and the output end of the current amplification circuit respectively, and the output end of the first operational amplifier is connected to the output end of the voltage amplification circuit.
In a second aspect, the present application provides an electronic device, which includes the above aspects and the circuit included in any one of the possible embodiments.
This application protects the amplifying triode through increasing the protection triode, when the output of the amplifying circuit of spin-transformer excitation signal takes place the short circuit, can realize the function of output short-circuit protection, has improved the security of spin-transformer excitation signal amplifying circuit.
Drawings
Fig. 1 is a block diagram of an amplifying circuit for a rotary-transform excitation signal according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of an amplifying circuit for a rotary-transform excitation signal according to an embodiment of the present disclosure;
fig. 3 is an electronic device according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The following describes embodiments of the present application in further detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a block diagram of a structure of an amplifying circuit for a rotary excitation signal according to an embodiment of the present disclosure. As shown in fig. 1, the amplifying circuit of the rotary-transformed excitation signal includes at least one sub-amplifying circuit 10 of the rotary-transformed excitation signal, the sub-amplifying circuit 10 of the rotary-transformed excitation signal includes a voltage amplifying circuit 100 and a current amplifying circuit 101, an input terminal of the voltage amplifying circuit 100 is connected to an excitation signal source, an output terminal of the voltage amplifying circuit 100 is connected to an input terminal of the current amplifying circuit 101, an output terminal of the current amplifying circuit 101 is connected to an input terminal of a rotary transformer, the current amplifying circuit 101 includes a first amplifying transistor Q1, a second amplifying transistor Q2, a first protection transistor QP1, and a first resistor R1, wherein:
the base of the first amplifying transistor Q1, the collector of the first protection transistor QP1, and the base of the second amplifying transistor Q2 are all connected to the input end of the current amplifying circuit 101; a collector of the first amplifying triode Q1 is connected with a power supply VCC, and an emitter of the first amplifying triode Q1 is connected with a base of the first protection triode QP1 and one end of the first resistor R1, respectively;
the other end of the first resistor R1, the emitter of the first protection transistor QP1, and the emitter of the second amplifying transistor Q2 are all connected to the output end of the current amplifying circuit 101, and the collector of the second amplifying transistor Q2 is connected to ground GND.
The working principle of the sub-amplifying circuit 10 for the rotary-change excitation signal is as follows:
the voltage amplification circuit 100 performs voltage amplification on an excitation signal output by an excitation signal source, and sends the excitation signal after the voltage amplification to the current amplification signal 100, it can be understood that the excitation signal is an alternating current signal, and optionally, the excitation signal may be a sine envelope signal or a cosine envelope signal, and has high and low levels. When the pumping signal is high, the first amplifying transistor Q1 is turned on, and the second amplifying transistor Q2 is turned off; when the excitation signal is at a low level, the first amplifying transistor Q1 is turned off, the second amplifying transistor Q2 is turned on, the current of the resolver may be discharged through the second amplifying transistor Q2, the output power of the current amplifying circuit 101 may be increased due to the existence of the second amplifying transistor, when the output end of the amplifying circuit of the resolver excitation signal is short-circuited and the first amplifying transistor Q1 is in a conducting state, the current of the power source VCC passes through the first amplifying transistor Q1 and the first resistor R1 to ground, the current of the power source VCC is very large at this time, a large voltage drop is formed across the first resistor R1, when the voltage drop across the first resistor R1 is greater than the conducting voltage drop of the first protecting transistor QP1, the first protecting transistor QP1 is turned on, and the base of the first amplifying circuit Q1 may be considered as being connected to ground, the base voltage of the first amplifying circuit Q1 is zero, and the first amplifying transistor Q1 is turned off.
Optionally, the voltage amplification circuit 100 may perform voltage amplification on the resolver excitation signal output by the excitation signal source through an operational amplifier, or may implement voltage amplification through an independent component having a voltage amplification function, for example, a triode or a field effect transistor.
In one possible embodiment, the excitation signal source is a rotary digital decoding chip, such as AD2S90, that decodes a digital signal carrying the rotor position of the resolver into an analog signal. In another possible embodiment, the excitation signal source is a Processor with a digital-to-analog conversion function, and the Processor may be an integrated circuit, including but not limited to a Central Processing Unit (CPU), an embedded microcontroller Unit (MCU), an embedded microprocessor Unit (MPU), and an embedded System on Chip (SoC).
This application is through increasing first protection triode QP1 is right first amplification triode Q1 protects, when the output of the amplifier circuit of spin-transformer excitation signal takes place the short circuit, can realize the function of circuit output short-circuit protection, has improved the security of spin-transformer excitation signal amplifier circuit.
The corresponding block diagram of fig. 1 will be described with reference to specific components. Referring to fig. 2, fig. 2 is a schematic diagram of an amplifying circuit for a rotating excitation signal according to an embodiment of the present disclosure. As shown in fig. 2, the amplifying circuit 20 of the rotated excitation signal includes at least one sub-amplifying circuit of the rotated excitation signal, and for example, the amplifying circuit 20 of the rotated excitation signal includes a first sub-amplifying circuit 200 of the rotated excitation signal and a second sub-amplifying circuit 210 of the rotated excitation signal, wherein:
the first sub-amplifying circuit 200 for the rotary excitation signal comprises a first voltage amplifying circuit 2000 and a first current amplifying circuit 2001, wherein the input end of the first voltage amplifying circuit 2000 is connected with an excitation signal source, the output end of the first voltage amplifying circuit 2000 is connected with the input end of the first current amplifying circuit 2001, the output end of the first current amplifying circuit 2001 is connected with the input end of a rotary transformer, and the first current amplifying circuit 2001 comprises a first amplifying triode Q1, a second amplifying triode Q2, a first protection triode QP1 and a first resistor R1.
The base of the first amplifying transistor Q1, the collector of the first protection transistor QP1, and the base of the second amplifying transistor Q2 are all connected to the input terminal of the first current amplifying circuit 2000; a collector of the first amplifying triode Q1 is connected with a power supply VCC, and an emitter of the first amplifying triode Q1 is connected with a base of the first protection triode QP1 and one end of the first resistor R1, respectively; the other end of the first resistor R1, the emitter of the first protection transistor QP1, and the emitter of the second amplification transistor Q2 are all connected to the output end of the first current amplification circuit 2001, and the collector of the second amplification transistor Q2 is connected to ground. Specifically, when the output end of the amplifying circuit of the rotary transformer excitation signal is short-circuited and the first amplifying triode Q1 is in a conducting state, the first protection triode QP1 is in a conducting state, and the base voltage of the first amplifying triode Q1 is clamped to a low level, so that the first amplifying triode Q1 is in a cut-off state, and the first amplifying triode Q1 is protected.
Further, the current amplifying circuit further includes a second protection transistor QP2 and a second resistor R2, where: a collector of the second protection transistor QP2 is connected to the input terminal of the first current amplifying circuit 2001, a base of the second protection transistor QP2 is connected to one end of the second resistor R2, and the other end of the second resistor R2 and an emitter of the second protection transistor QP2 are connected to the output terminal of the first current protecting circuit 2001. Specifically, when the output end of the first sub-amplifying circuit 200 of the rotary-change excitation signal is short-circuited and the second amplifying transistor Q2 is in the on state, the current of the rotary transformer passing through the second resistor R2 is increased, so that the voltage drop of the second resistor R2 is increased, and when the voltage drop of the second resistor R2 reaches the on voltage of the second protection transistor QP2, the second protection transistor QP2 is turned on, so that the second amplifying transistor Q2 is in the off state, thereby protecting the second amplifying transistor Q2.
In a possible embodiment, the amplification circuit 20 of the rotated excitation signal comprises two sub-amplification circuits of the rotated excitation signal; the input ends of the sub-amplifying circuits of the two rotary-change excitation signals are respectively connected with two excitation signal sources, and the phase difference of the excitation signals output by the two excitation signal sources is 180 degrees. For example, the input terminal of the first sub-amplifying circuit 200 of the rotary variable driving signal is connected to a first driving signal source, and the input terminal of the second sub-amplifying circuit 210 of the rotary variable driving signal is connected to a second driving signal source, which may be, for example, two output pins of a rotary variable digital decoding chip.
Further, the first sub-amplifying circuit 200 of the rotary-change excitation signal further includes a third capacitor C3; the output terminal of the first current amplifying circuit 2001 is connected to the resolver through the third capacitor C3. The third capacitor C3 is used to isolate the dc power supply of the rotary transformer, so as to protect the second amplifying transistor Q2.
In one possible embodiment, the first current amplifying circuit 2001 further includes a first diode D1, a second diode D2, a fourth resistor R4, and a fifth resistor R5; the connection of the base of the first amplifying transistor Q1, the collector of the first protection transistor QP1, and the base of the second amplifying transistor Q2 to the input of the first current amplifying circuit 2001 includes: a connection point of a base of the first amplifying transistor Q1 and a collector of the first protection transistor QP1 is connected to a connection point of an anode of the first diode D1 and one end of the fourth resistor R4, a cathode of the first diode D1 is connected to an input end of the first current amplifying circuit 2001, and the other end of the fourth resistor R4 is connected to a power supply VCC; a base of the second amplifying transistor Q2 is connected to a connection point between the cathode of the second diode D2 and one end of the fifth resistor R5, an anode of the second diode D2 is connected to the input terminal of the first current amplifying circuit 2001, and the other end of the fifth resistor R5 is connected to ground GND. The first diode D1 and the second diode D2 are configured to eliminate cross-over distortion occurring before and after a voltage value of an excitation signal source crosses zero in the first amplifying transistor Q1 and the second amplifying transistor Q2, and may also be understood as non-linear distortion, for example, when the sub-amplifying circuit of the rotary excitation signal receives a first excitation signal output by the excitation signal source, and the voltage value of the first excitation signal is greater than zero but has not yet reached an on-voltage of the first amplifying transistor Q1, the first amplifying transistor Q1 is in an off state, so that the output of the first excitation signal is non-linear output or no output, and the like. For another example, when the voltage value of the first excitation signal is less than zero but has not yet reached the turn-on voltage of the second amplification transistor Q2, the second amplification transistor Q2 is in a cut-off state, which results in the output of the first excitation signal being a non-linear output or no output, etc., the present application provides that the first diode D1 and the second diode D2 are added to make the first amplification transistor Q1 and the second amplification transistor Q2 in a micro-conducting state when the voltage value of the first excitation signal is zero, and when the voltage value of the first excitation signal is greater than zero, the first amplification transistor Q1 immediately enters a linear region; when the first driver signal has a voltage level of one less than zero, the second amplifying transistor Q2 immediately enters the linear region, thereby avoiding the occurrence of non-linear distortion in the first amplifying transistor Q1 and the second amplifying transistor Q2 when the voltage level of the first driver signal is zero.
Optionally, the first current amplifying circuit 2001 further includes a fifth capacitor C5 and a sixth capacitor C6, wherein: one end of the fifth capacitor C5 is connected to the power source VCC, and the other end of the fifth capacitor C5 is connected to the base of the first amplifying transistor Q1, the collector of the first protection transistor QP1, and the anode of the first diode D1, respectively; one end of the sixth capacitor C6 is connected to the base of the second amplifying transistor Q2 and the cathode of the second diode D2, respectively, and the other end of the sixth capacitor C6 is connected to ground GND. Specifically, since the inter-electrode feedback caused by the parasitic capacitance of the transistor causes the transistor to generate the self-excited phenomenon in the high frequency band, the high-frequency self-excited phenomenon caused by the parasitic capacitance of the second amplifying transistor Q2 can be eliminated by adding a neutralization capacitor between the base and the collector of the transistor, for example, the fifth capacitor C5 between the base and the collector of the first amplifying transistor Q1, and for example, the sixth capacitor C6 between the base and the collector of the second amplifying transistor Q2, so that the amplitude of the feedback signal introduced by the parasitic capacitance of the fifth capacitor C5 and the parasitic capacitance of the first amplifying transistor Q1 are equal, and the amplitude of the feedback signal introduced by the parasitic capacitance of the sixth capacitor C6 and the parasitic capacitance of the second amplifying transistor Q2 are equal.
In one possible implementation, the first voltage amplifying circuit 2000 includes a first operational amplifier U1, a sixth resistor R6, a seventh resistor R7, and a fourth capacitor C4, wherein: one end of the sixth resistor R6 is connected to the input end of the first voltage amplifying circuit 2000, and the other end of the sixth resistor R6 is connected to the inverting input end of the first operational amplifier U1, one end of the fourth capacitor C4, and one end of the seventh resistor R7, respectively; the other end of the fourth capacitor C4 is connected to the other end of the seventh resistor R7 and the output end of the first current amplifying circuit 2001, respectively, and the output end of the first operational amplifier U1 is connected to the output end of the first voltage amplifying circuit 2000. Specifically, the seventh resistor R7, the fourth capacitor C4 and the first operational amplifier U1 form a proportional-integral amplifier circuit, the seventh resistor R7 and the fourth capacitor C4 are connected in parallel, and are connected to the output end of the first current amplifier circuit 2001, so as to feed back the excitation signal output by the first current amplifier circuit 2001 to the first voltage amplifier circuit 2000, and when the excitation signal output by the current amplifier circuit is unstable due to the fact that the impedance characteristics of the resolver are deteriorated due to model inconsistency of the resolver or temperature change, the excitation signal can be fed back to the first voltage amplifier circuit 2000, so as to achieve the effect of stabilizing the excitation signal output by the first current amplifier circuit 2001. Optionally, the first amplifying circuit 2000 may further include an eighth resistor R8, and the eighth resistor R8 is connected in parallel with the fifth resistor R5. It will be appreciated that a supply filter capacitor, such as a seventh capacitor C7, may be added at the supply VCC.
Similarly, the second sub-amplifying circuit 210 for the rotary-change excitation signal includes a second voltage amplifying circuit 2100 and a second current amplifying circuit 2101, an input end of the second voltage amplifying circuit 2100 is connected to the excitation signal source, an output end of the second voltage amplifying circuit 2100 is connected to an input end of the second current amplifying circuit 2101, an output end of the second current amplifying circuit 2101 is connected to an input end of the rotary transformer, and the second current amplifying circuit 2101 includes a third amplifying triode Q3, a fourth amplifying triode Q4, a third protecting triode QP3 and a ninth resistor R9.
The base of the third amplifying transistor Q3, the collector of the third protection transistor QP3, and the base of the fourth amplifying transistor Q4 are all connected to the input terminal of the second current amplifying circuit 2100; a collector of the third amplifying triode Q3 is connected to a power supply VCC, and an emitter of the third amplifying triode Q3 is connected to a base of the third protection triode QP3 and one end of the ninth resistor R9, respectively; the other end of the ninth resistor R9, the emitter of the third protection transistor QP3, and the emitter of the fourth amplification transistor Q4 are all connected to the output end of the second current amplifying circuit 2101, and the collector of the fourth amplification transistor Q4 is connected to ground. Specifically, when the output end of the amplifying circuit of the rotary transformer excitation signal is short-circuited and the third amplifying transistor Q3 is in a conducting state, the third protection transistor QP3 is in a conducting state, and the base voltage of the third amplifying transistor Q3 is clamped to a low level, so that the third amplifying transistor Q3 is in a cut-off state, and the third amplifying transistor Q3 is protected.
Further, the current amplifying circuit further includes a fourth protection transistor QP4 and a tenth resistor R10, where: a collector of the fourth protection triode QP4 is connected to an input end of the second current amplifying circuit 2101, a base of the fourth protection triode QP4 is connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 and an emitter of the fourth protection triode QP4 are connected to an output end of the second current amplifying circuit 2101. Specifically, when the output end of the second sub-amplifying circuit 210 of the resolver excitation signal is short-circuited and the fourth protection transistor QP4 is in the on state, the current of the resolver passing through the tenth resistor R10 increases, so that the voltage drop of the tenth resistor R10 increases, and when the voltage drop of the tenth resistor R10 reaches the on voltage of the fourth protection transistor QP4, the fourth protection transistor QP4 is turned on, so that the fourth amplification transistor Q4 is in the off state, thereby protecting the fourth amplification transistor Q4.
Further, the second sub-amplifying circuit 210 for the revolutionary excitation signal further includes an eighth capacitor C8; the output end of the second current amplifying circuit 2101 is connected to the rotary transformer through the eighth capacitor C8. The eighth capacitor C8 is used to isolate the dc power supply of the rotary transformer, so as to protect the fourth amplifying transistor Q4.
In one possible embodiment, the second current amplifying circuit 2101 further comprises a third diode D3, a fourth diode D4, an eleventh resistor R11 and a twelfth resistor R12; the base of the third amplifying transistor Q3, the collector of the third protection transistor QP3, and the base of the fourth amplifying transistor Q4 are all connected to the input end of the second current amplifying circuit 2101, which includes: a connection point of a base of the third amplification triode Q3 and a collector of the third protection triode QP3 is connected to a connection point of an anode of the third diode D3 and one end of the eleventh resistor R11, a cathode of the third diode D3 is connected to the input end of the second current amplification circuit 2101, and the other end of the eleventh resistor R11 is connected to the power supply VCC; a base of the fourth amplifying transistor Q4 is connected to a connection point between the cathode of the fourth diode D4 and one end of the twelfth resistor R12, an anode of the fourth diode D4 is connected to the input terminal of the second current amplifying circuit 2101, and the other end of the twelfth resistor R12 is connected to ground GND. The third diode D3 and the fourth diode D4 are configured to eliminate cross-over distortion occurring before and after a voltage value of an excitation signal source crosses zero in the third amplifying transistor Q3 and the fourth amplifying transistor Q4, and may also be understood as non-linear distortion, for example, when a second sub-amplifying circuit of the rotary excitation signal receives a second excitation signal output by the excitation signal source, and a voltage value of the second excitation signal is greater than zero but does not reach an on-voltage of the third amplifying transistor Q3, the third amplifying transistor Q3 is in an off state, so that an output of the second excitation signal is a non-linear output or no output, and the like. For another example, when the voltage value of the second driving signal is less than zero but has not yet reached the turn-on voltage of the fourth amplifying transistor Q4, the fourth amplifying transistor Q4 is in a turn-off state, which results in the output of the second driving signal being a non-linear output or no output, etc., the present application provides that the third diode D3 and the fourth diode D4 are added, so that the third amplifying transistor Q3 and the fourth amplifying transistor Q4 are in a micro-conducting state when the voltage value of the second driving signal is zero, and when the voltage value of the second driving signal is one greater than zero, the third amplifying transistor Q3 immediately enters a linear region; when the first driver signal has a voltage value of one less than zero, the fourth amplifying transistor Q4 immediately enters the linear region, thereby avoiding the occurrence of non-linear distortion in the third amplifying transistor Q3 and the fourth amplifying transistor Q4 when the voltage value of the first driver signal is zero.
Optionally, the second current amplifying circuit 2101 further includes a tenth capacitor C10 and an eleventh capacitor C11, wherein: one end of the tenth capacitor C10 is connected to the power source VCC, and the other end of the tenth capacitor C10 is connected to the base of the third amplifying transistor Q3, the collector of the second protection transistor QP2, and the anode of the third diode D3, respectively; one end of the eleventh capacitor C11 is connected to the base of the fourth amplifying transistor Q4 and the cathode of the fourth diode D4, respectively, and the other end of the eleventh capacitor C11 is connected to ground GND. Specifically, since the inter-electrode feedback caused by the parasitic capacitance of the transistor causes the transistor to generate the self-excited phenomenon in the high frequency band, the high-frequency self-excited phenomenon caused by the parasitic capacitance of the fourth amplifying transistor Q4 can be eliminated by adding a neutralization capacitor between the base and the collector of the transistor, for example, the tenth capacitor C10 between the base and the collector of the third amplifying transistor Q3, and for example, the eleventh capacitor C11 between the base and the collector of the third amplifying transistor Q3, so that the amplitude of the feedback signal introduced by the parasitic capacitance of the tenth capacitor C10 and the parasitic capacitance of the third amplifying transistor Q3 are equal, and the amplitude of the feedback signal introduced by the parasitic capacitance of the eleventh capacitor C11 and the parasitic capacitance of the fourth amplifying transistor Q4 are equal.
In one possible implementation, the second voltage amplifying circuit 2100 includes a second operational amplifier U2, a thirteenth resistor R13, a fourteenth resistor R14, and a ninth capacitor C9, wherein: one end of the thirteenth resistor R13 is connected to the input end of the second voltage amplifying circuit 2100, and the other end of the thirteenth resistor R13 is connected to the inverting input end of the second operational amplifier U2, one end of the ninth capacitor C9, and one end of the fourteenth resistor R14, respectively; the other end of the ninth capacitor C9 is connected to the other end of the fourteenth resistor R14 and the output end of the second current amplifying circuit 2101, and the output end of the second operational amplifier U2 is connected to the output end of the second voltage amplifying circuit 2100. Specifically, the thirteenth resistor R13, the ninth capacitor C9 and the second operational amplifier U2 form a proportional-integral amplifier circuit, the fourteenth resistor R14 and the ninth capacitor C9 are connected in parallel and are connected to the output end of the second current amplifier circuit 2101, the excitation signal output by the second current amplifier circuit 2101 is fed back to the second voltage amplifier circuit 2100, and the excitation signal output by the current amplifier circuit is fed back to the second voltage amplifier circuit 2100 when the excitation signal output by the current amplifier circuit is unstable due to the fact that the impedance characteristics of the resolver are deteriorated due to model inconsistency or temperature change of the resolver, so that the effect of stabilizing the excitation signal output by the second current amplifier circuit 2101 is achieved. Optionally, the second amplifying circuit 2100 may further include a fifteenth resistor R15, and the fifteenth resistor R15 is connected in parallel to the thirteenth resistor R13. It will be appreciated that a supply filter capacitor, such as a twelfth capacitor C12, may be added at the supply VCC.
Further, the amplifying circuit 20 of the rotated excitation signal further includes a differential mode interference suppressing circuit 220, wherein the differential mode interference suppressing circuit 220 is between the output terminals of the sub-amplifying circuits of the two rotated excitation signals. In one possible implementation, the differential mode interference suppression circuit 220 includes a first capacitor C1, a second resistor R2, and a second capacitor C2, where: one end of the first capacitor C1 is connected to the output end of one of the sub-amplifying circuits for the rotationally-varying excitation signal, the other end of the first capacitor C1 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the output end of the other sub-amplifying circuit for the rotationally-varying excitation signal. Optionally, the differential mode suppression circuit 220 may further implement suppression of differential mode interference by using other capacitive components or inductive components. The differential mode suppression circuit 220 is configured to suppress differential mode interference between the first sub-amplification circuit 200 of the revolute excitation signal and the second sub-amplification circuit 210 of the revolute excitation signal.
The embodiment of the present application further provides an electric device, referring to fig. 3, the electric device 30 includes a processor 301, an amplifying circuit 302 for rotating a driving signal, and a memory 303, where:
the memory 303 is configured to store instructions, the processor 301 is configured to execute the instructions, and the amplification circuit 302 of the rotating excitation signal is configured to amplify the rotating excitation signal.
Optionally, the electric device 30 may further include a transceiver for communicating with other devices under the control of the processor 301.
The processor 301 may be a Central Processing Unit (CPU), a general purpose processor, a Digital Signal Processor (DSP), an application-specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure of the embodiments of the application. A processor may also be a combination of computing functions, e.g., comprising one or more combinations of microprocessors, and the like.
Besides the amplifying circuit 302, the processor 301 and the memory 303 of the rotation-change excitation signal shown in fig. 3, the electric device in the embodiment of the present application may further include other hardware according to the actual function of the electric device, which is not described again. Optionally, the electric device can achieve the beneficial effects of the protection circuit, and the structure and the function of the amplification circuit 302 of the rotary-change excitation signal may refer to the description in the embodiments described in fig. 1 to fig. 2, which is not described herein again.
It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. It should be understood that the corresponding example in fig. 2 is only used for explaining the embodiment of the present application, and should not be construed as limiting, and in the alternative, fig. 2 may also have other implementations, for example, other capacitive and/or inductive components may be used as the differential mode interference suppression circuit, and the like, and are not listed here.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (10)
1. The amplifying circuit of the rotary-change excitation signal is characterized in that the amplifying circuit of the rotary-change excitation signal comprises at least one sub-amplifying circuit of the rotary-change excitation signal, the sub-amplifying circuit of the rotary-change excitation signal comprises a voltage amplifying circuit and a current amplifying circuit, the input end of the voltage amplifying circuit is connected with an excitation signal source, the output end of the voltage amplifying circuit is connected with the input end of the current amplifying circuit, the output end of the current amplifying circuit is connected with the input end of a rotary transformer, the current amplifying circuit comprises a first amplifying triode, a second amplifying triode, a first protection triode and a first resistor, and the amplifying circuit comprises:
the base electrode of the first amplifying triode, the collector electrode of the first protection triode and the base electrode of the second amplifying triode are connected to the input end of the current amplifying circuit; a collector electrode of the first amplifying triode is connected with a power supply, and an emitter electrode of the first amplifying triode is respectively connected with a base electrode of the first protection triode and one end of the first resistor;
the other end of the first resistor, the emitter of the first protection triode and the emitter of the second amplification triode are all connected to the output end of the current amplification circuit, and the collector of the second amplification triode is connected with the ground.
2. The amplification circuit of a rotary-transformed excitation signal according to claim 1, wherein the current amplification circuit further comprises a second protection transistor and a second resistor, wherein:
the collector of the second protection triode is connected to the input end of the current amplification circuit, the base of the second protection triode is connected with one end of the second resistor, and the other end of the second resistor and the emitter of the second protection triode are connected to the output end of the current protection circuit.
3. The amplification circuit of a rotated excitation signal as claimed in claim 1, wherein the amplification circuit of a rotated excitation signal comprises two sub-amplification circuits of a rotated excitation signal;
the input ends of the sub-amplifying circuits of the two rotary-change excitation signals are respectively connected with two excitation signal sources, and the phase difference of the excitation signals output by the two excitation signal sources is 180 degrees.
4. A circuit for amplifying a rotated excitation signal as claimed in claim 3, wherein said circuit for amplifying a rotated excitation signal further comprises a differential mode interference suppression circuit, wherein said differential mode interference suppression circuit is between the outputs of said two sub-amplification circuits for the rotated excitation signal.
5. The amplification circuit for a rotary-transformed excitation signal according to claim 4, wherein the differential mode interference suppression circuit comprises a first capacitor, a third resistor, and a second capacitor, wherein:
one end of the first capacitor is connected with the output end of one of the sub-amplification circuits of the rotary-change excitation signal, the other end of the first capacitor is connected with one end of the third resistor, and the other end of the third resistor is connected with the output end of the other sub-amplification circuit of the rotary-change excitation signal.
6. The amplification circuit for a revolutionary excitation signal according to claim 1, wherein the sub-amplification circuit for a revolutionary excitation signal further comprises a third capacitor;
the output end of the current amplification circuit is connected with the input end of the rotary transformer, and the current amplification circuit comprises:
and the output end of the current amplification circuit is connected with the rotary transformer through the third capacitor.
7. The amplification circuit of a rotary-transformed excitation signal according to claim 1, wherein the current amplification circuit further comprises a first diode, a second diode, a fourth resistor, and a fifth resistor;
the base of the first amplifying triode, the collector of the first protection triode and the base of the second amplifying triode are all connected to the input end of the current amplifying circuit, and the current amplifying circuit comprises:
a connection point of a base electrode of the first amplifying triode and a collector electrode of the first protection triode is connected with a connection point of an anode of the first diode and one end of the fourth resistor, a cathode of the first diode is connected with an input end of the current amplifying circuit, and the other end of the fourth resistor is connected with a power supply;
the base electrode of the second amplifying triode is connected with the cathode of the second diode and the connection point of one end of the fifth resistor, the anode of the second diode is connected with the input end of the current amplifying circuit, and the other end of the fifth resistor is connected with the ground.
8. The amplification circuit for a rotary-transformed excitation signal according to claim 7, wherein the current amplification circuit further comprises a fifth capacitor and a sixth capacitor, wherein:
one end of the fifth capacitor is connected with the power supply, and the other end of the fifth capacitor is respectively connected with the base electrode of the first amplifying triode, the collector electrode of the first protection triode and the anode of the first diode;
one end of the sixth capacitor is connected with the base electrode of the second amplifying triode and the cathode of the second diode respectively, and the other end of the sixth capacitor is connected with the ground.
9. The amplification circuit for a rotary-transformed excitation signal according to claim 1, wherein the voltage amplification circuit comprises a first operational amplifier, a sixth resistor, a seventh resistor, and a fourth capacitor, wherein:
one end of the sixth resistor is connected to the input end of the voltage amplifying circuit, and the other end of the sixth resistor is respectively connected to the inverting input end of the first operational amplifier, one end of the fourth capacitor and one end of the seventh resistor;
the other end of the fourth capacitor is connected with the other end of the seventh resistor and the output end of the current amplification circuit respectively, and the output end of the first operational amplifier is connected to the output end of the voltage amplification circuit.
10. An electronic device, characterized in that the electronic device comprises a circuit according to any of claims 1-9 therein.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922369364.8U CN211457089U (en) | 2019-12-25 | 2019-12-25 | Amplifying circuit of rotary-change excitation signal and electronic equipment |
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| CN201922369364.8U CN211457089U (en) | 2019-12-25 | 2019-12-25 | Amplifying circuit of rotary-change excitation signal and electronic equipment |
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| CN211457089U true CN211457089U (en) | 2020-09-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116743025A (en) * | 2023-08-10 | 2023-09-12 | 苏州时代新安能源科技有限公司 | Rotary-changing excitation signal circuit and motor controller |
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2019
- 2019-12-25 CN CN201922369364.8U patent/CN211457089U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116743025A (en) * | 2023-08-10 | 2023-09-12 | 苏州时代新安能源科技有限公司 | Rotary-changing excitation signal circuit and motor controller |
| CN116743025B (en) * | 2023-08-10 | 2024-01-09 | 苏州时代新安能源科技有限公司 | Rotary-changing excitation signal circuit and motor controller |
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