A synchro power driver

Abstract

The present invention discloses a synchro power driver, which includes a pulsating power supply circuit, a SCOTT transformer zero-stabilizing power driving circuit, and a measurement and control protection circuit; the pulsating power supply circuit receives a reference signal, generates a signal power supply and a power power supply to provide to the measurement and control protection circuit and the SCOTT transformer zero-stabilizing power driving circuit; the SCOTT transformer zero-stabilizing power driving circuit receives a synchro or a rotary transformer signal, outputs a synchro signal after isolation and transformation, and realizes a zero-stabilizing function by synthesizing a single-phase signal center point and connecting to the zero-stabilizing point of the SCOTT transformer; the measurement and control protection circuit receives an enable signal to realize an output shutdown function, monitors current and temperature in real time, outputs an overheating and overcurrent indication signal, and realizes an anti-blocking function by switching an angle position signal when overcurrent occurs. The present invention has low power consumption, perfect protection function, and high reliability, and is conducive to the promotion and application in the field of angle measurement and control.

Description

Technical Field

[0001] The present invention relates to the technical field of angle measurement and control, in particular to a driving control circuit of a torque receiver used in the field of angle measurement and control, and more particularly to a synchro power driver. Background Art

[0002] At present, the synchro power drive components in the existing servo control system are not only large in size and low in efficiency, but also have incomplete control functions. In the case of large angle changes, if the power is not turned off manually by external means, the drive components are easily burned out. They cannot meet the system's control needs for a high-reliability and high-efficiency servo control system.

[0003] The traditional servo control system requires manual rotation of the motor to achieve angle control of large servo equipment and transmission of the control angle. This operation requires both the sender and receiver to be staffed for real-time operation, which is not only inefficient, but also has low control accuracy due to the influence of mechanical assembly gears, which cannot meet the system's high-precision and high-speed control needs. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies of the prior art and traditional operating methods, and propose a synchro power driver, which uses a reference excitation signal as a signal power supply and a power power supply, receives a synchro or a rotary transformer signal, and outputs a synchro signal with a certain power after isolation and transformation; the driver can receive a DIS control signal to realize output enable and shutdown functions; can monitor current and temperature in real time, and output a working status indication signal BIT; when overcurrent occurs, the anti-blocking function can be realized by short-circuiting the CO and K terminals.

[0005] The technical solution to achieve the purpose of the present invention is: a synchro power driver, which includes a pulsating power supply circuit, a SCOTT transformer zero-stabilizing power drive circuit, and a measurement and control protection circuit; the pulsating power supply circuit receives a reference excitation signal, generates a signal power supply and a power power supply to provide to the measurement and control protection circuit and the SCOTT transformer zero-stabilizing power drive circuit; the SCOTT transformer zero-stabilizing power drive circuit receives a synchro or a rotary transformer signal, outputs a synchro signal after isolation and transformation, and realizes a zero-stabilizing function; the measurement and control protection circuit receives a DIS enable signal to realize an output enable shutdown function, and can also monitor current and temperature information in real time and output an overheat and overcurrent indication signal BIT, and realizes an anti-blocking function by switching the angle position signal when overcurrent occurs.

[0006] Furthermore, the pulsating power supply circuit includes a power transformer, a rectifier diode, a voltage regulator, a sampling resistor, and a filter capacitor; the power transformer receives a reference excitation signal and outputs low-voltage and high-voltage AC power supplies, the low-voltage power supply is full-wave rectified by a rectifier diode and a voltage regulator tube, and filtered by a filter capacitor to generate a stabilized DC power supply for use in a measurement and control protection circuit and as a DC bias for the pulsating power supply; the high-voltage AC power supply is full-wave rectified and superimposed on the DC bias generated by the low-voltage power supply to serve as the power supply for the SCOTT transformer zero-power drive circuit.

[0007] Furthermore, the SCOTT transformer zero-stabilizing power driving circuit includes a SCOTT transformer, an analog switch, an operational amplifier, a current expansion circuit, and an integration circuit; the SCOTT transformer isolates and transforms the input synchro or rotary transformer signal into a standard three-phase synchronous signal, which is switched to the operational amplifier via the analog switch to be amplified to the required line-to-line voltage, and at the same time, the current expansion circuit performs current expansion processing, and finally outputs the synchro signal, which is fed back and integrated by the operational amplifier and the integration circuit to synthesize the voltage stabilization zero point and connect to the SCOTT transformer to form a closed-loop negative feedback to achieve stable and reliable output.

[0008] Furthermore, the measurement and control protection circuit is used to realize the DIS output prohibition, overheating, overcurrent and stalling functions. All control signals are photoelectrically isolated. Specifically: DIS is valid at a high level. When there is no overheating indication signal, the DIS input is '1', the three-way power drive circuit has no bias voltage, and the output is prohibited; when the input is '0', the three-way power drive circuit has a bias voltage and the output is enabled; when overheating is indicated, when the internal temperature reaches its Curie point, the thermistor resistance increases, the hysteresis comparator output is a negative power supply, the optocoupler output is cut off, and the BIT output is '1'; when the internal temperature is lower than the Curie point At this point, the resistance of the thermistor decreases, the hysteresis comparator outputs a positive power supply, the optocoupler output is saturated, and the BIT output is '0'; during overcurrent indication, when the peak current reaches 1.0A, the voltage of the sampling resistor in the pulsating power supply circuit is detected, and further amplified, half-wave rectified and filtered, and finally a negative power supply is output through the comparator, triggering the BIT output to be '1', and a fixed-period CO digital signal is output through the rectangular wave generator, which is connected to the analog switch control terminal K in the SCOTT transformer zero-power drive circuit to achieve an angle change of 120°, thereby realizing the anti-stall function.

[0009] Compared with the prior art, the present invention has the following significant advantages:

[0010] 1) By designing a pulsating power supply circuit, high-voltage power electricity with the same frequency and phase is provided to the power amplifier circuit. Compared with the existing high-voltage DC power supply technology, the heat loss is reduced by more than half, the reliability is greatly improved, and the power electricity is isolated from the external control electricity, which greatly improves the safety.

[0011] 2) By designing the SCOTT transformer zero-power drive circuit, the three output signals of the synchro are integrated to form a voltage-stabilized zero point, which is used as the signal reference of the internal isolation circuit. When one or more signals fluctuate or deviate due to abnormal conditions, the reference level can be automatically adjusted in real time, thereby effectively eliminating abnormal conditions such as output power overload and burning caused by unbalanced or missing phases of the three-phase load. The existing technology uses a fixed reference. When the three-phase load is unbalanced or missing phase, the output signal will contain a DC component, which is easy to cause overcurrent damage to the internal circuit.

[0012] 3) By designing a measurement and control protection circuit, DIS can realize the power-on sequence control of external control power and power power, as well as the startup sequence control when multiple outputs are used, reducing the startup power supply current demand; BIT can realize real-time indication of overheating and overcurrent, increasing circuit reliability; when the load motor is blocked, the current increases instantly, and it will not be able to jump out of this abnormal state without external operation. At this time, the drive circuit is very likely to burn out due to overheating; and the anti-blocking function designed by the present invention will produce a fixed period of 120° angle change, and the motor will resume normal control after jumping out of this abnormal state, greatly improving the reliability of the circuit. In addition, the external digital signal and the internal digital signal are isolated through the optical coupling isolation device, and the safety is greatly improved.

[0013] The present invention is further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the overall circuit block diagram of the synchro power driver of the present invention.

[0015] Figure 2 It is the pulsating power supply circuit diagram of the present invention.

[0016] Figure 3 This is the circuit diagram of the SCOTT transformer zero-power drive circuit of the present invention.

[0017] Figure 4 This is a relationship diagram between line-to-line voltage and phase voltage of the present invention.

[0018] Figure 5 It is the current expansion circuit diagram of the present invention.

[0019] Figure 6 This is the measurement, control and protection circuit diagram of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] It should be noted that if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] In one embodiment, in combination Figure 1 , provides a synchro power driver, which consists of a pulsating power supply circuit, a SCOTT transformer zero-stabilizing power drive circuit, and a measurement and control protection circuit; the pulsating power supply circuit receives a reference signal, generates a filtered regulated power supply and a non-filtered unregulated power supply through a power transformer, and provides them to the measurement and control protection circuit and the SCOTT transformer zero-stabilizing power drive circuit; the SCOTT transformer zero-stabilizing power drive circuit receives a synchro or rotary transformer signal, performs isolation transformation through a SCOTT transformer, and outputs a synchro signal through a three-phase power drive circuit, and the output synchro signal is integrated into a single-phase signal center point through a zero-stabilizing circuit and connected to the SCOTT transformer zero-stabilizing point to achieve a zero-stabilizing function; the measurement and control protection circuit uses an optocoupler isolation device to isolate the internal signal from the upper computer signal to avoid interference between strong current and weak current, receives an enable signal to realize the output shutdown function, monitors the current and temperature in real time and outputs an overheating and overcurrent indication signal, and realizes the anti-blocking function by switching the angle position signal when overcurrent occurs.

[0023] Furthermore, in one of the embodiments, the pulsating power supply circuit includes a power transformer, a rectifier diode, a voltage regulator, a sampling resistor, and a filter capacitor; the power transformer receives a reference excitation signal and outputs low-voltage and high-voltage AC power supplies, the low-voltage power supply is full-wave rectified by a rectifier diode and a voltage regulator tube, and filtered by a filter capacitor to generate a stabilized DC power supply for use in a measurement and control protection circuit and as a DC bias for the pulsating power supply; the high-voltage AC power supply is full-wave rectified and superimposed on the DC bias generated by the low-voltage power supply to serve as the power supply for the SCOTT transformer zero-power drive circuit.

[0024] Here is an example, combined with Figure 2The pulsating power supply circuit specifically includes a power transformer T1, a first rectifier diode V28 to a fourth rectifier diode V31, a fifth rectifier diode V64 to an eighteenth rectifier diode V77, a first resistor R56, a second resistor R59, a third resistor R60, and a first capacitor C16 to a fourth capacitor C19; the power transformer T1 includes a primary winding and four secondary windings, wherein the two ends of the primary winding are respectively marked as terminal 1 and terminal 2, the two ends of the first secondary winding are respectively marked as terminal 3 and terminal 4, the two ends of the second secondary winding are respectively marked as terminal 5 and terminal 6, the two ends of the third secondary winding are respectively marked as terminal 6 and terminal 7, and the two ends of the fourth secondary winding are respectively marked as terminal 8 and terminal 9; the primary winding receives an external input reference excitation signal The second secondary winding and the third secondary winding are low-voltage windings. The 6th end of the second secondary winding is grounded through the third resistor R60. The 5th end is connected to the cathode of the twelfth rectifier diode V71, the cathode of the seventeenth rectifier diode V76, the anode of the fourteenth rectifier diode V73, and the anode of the sixteenth rectifier diode V75. The 7th end of the third secondary winding is connected to the cathode of the eleventh rectifier diode V70, the cathode of the eighteenth rectifier diode V77, the anode of the thirteenth rectifier diode V72, and the anode of the fifteenth rectifier diode V74. The anode of the twelfth rectifier diode V71 and the anode of the eleventh rectifier diode V70 are grounded through the third capacitor C18. The cathode of the fourteenth rectifier diode V73, the cathode of the thirteenth rectifier diode V75, and the anode of the fifteenth rectifier diode V76 are grounded. The cathode of the rectifier diode V72 is grounded through the fourth capacitor C19, the anode of the seventeenth rectifier diode V76 and the anode of the eighteenth rectifier diode V77 are grounded through the second capacitor C17, and the cathode of the fifteenth rectifier diode V74 and the cathode of the sixteenth rectifier diode V75 are grounded through the first capacitor C16; the first secondary winding and the fourth secondary winding are high-voltage windings, and the three ends are connected to the cathode of the first rectifier diode V28 and the anode of the second rectifier diode V29, and the four ends are connected to the cathode of the fourth rectifier diode V31 and the anode of the third rectifier diode V30, the anode of the first rectifier diode V28 and the anode of the fourth rectifier diode V31 are grounded through the fourth capacitor C19, and the second rectifier diode V The cathode of the first resistor R56 is connected to +Vz and the cathode of the fifth rectifier diode V64, and the other end is connected to +VC and is grounded through the first capacitor C16, and the anode of the fifth rectifier diode V64 is grounded;One end of the second resistor R59 is connected to -Vz and the positive electrode of the sixth rectifier diode V65, and the other end is connected to -VC and grounded through the second capacitor C17. The negative electrode of the sixth rectifier diode V65 is grounded. ;

[0025] The specific analysis of the above circuit is as follows: T1 primary winding 1-2 receives the external input 115V reference excitation signal, T1 secondary winding 5-6, 6-7 is a 13V low-voltage winding, after V70-V73 full-wave rectification and C18, C19 filtering, an 18V DC regulated power supply is output as a pulsating power supply DC bias; in order to avoid mutual interference between strong and weak currents, V74-V77 full-wave rectification and C16, C17 filtering are set to output an 18V DC regulated power supply for the measurement and control protection circuit, R56, V64 and R59, V65 form a voltage stabilizing circuit to generate a 6.8V DC power supply for the logic circuit. The secondary windings 3-4 and 8-9 of T1 are 44V high-voltage windings. After full-wave rectification by V28-V31 and V66-V69, an AC signal with an amplitude of 62V is output. After the low end is connected to an 18V DC regulated power supply, a pulsating power supply with a DC bias of 18V and a peak value of 80V is finally output. This power supply has a higher power supply efficiency than a DC power supply, and the calculation is as follows:

[0026] The power supply heat consumption is the power drive circuit current multiplied by the difference between the power supply voltage and the output voltage. When the Class A and B complementary push-pull power drive circuit is powered by a DC power supply, the two tubes conduct 180° in one signal cycle, and the current passing through the two tubes and the voltage VCE at both ends of the two tubes are equal in value. Therefore, in order to calculate the total tube consumption, it is sufficient to first calculate the single tube consumption. Assuming the output voltage is uo=Uomsinwt, and the DC voltage VCC=Vom+VC, the single tube consumption is:

[0027]

[0028] The total heat loss of the power supply is

[0029] When the power driving circuit is powered by a pulsating power supply, the power consumption of a single tube can be calculated as follows:

[0030]

[0031] The total heat loss of the power supply is

[0032]

[0033] It can be seen that the heat consumption ratio of the pulsating power supply and the DC power supply is related to Vom and VC. When the power supply is turned on, the heat loss ratio of the pulsating power supply to the DC power supply is close to 50%, that is, compared with the DC power supply, the heat loss of the pulsating power supply is reduced by half, and the reliability is greatly improved.

[0034] Furthermore, in one of the embodiments, the SCOTT transformer zero-stabilizing power driving circuit includes a SCOTT transformer, an analog switch, an operational amplifier, a current expansion circuit, and an integration circuit; the SCOTT transformer isolates and transforms the input synchro or rotary transformer signal into a standard three-phase synchronous signal, which is switched to the operational amplifier via the analog switch to be amplified to the required line-to-line voltage, and at the same time, the current expansion circuit performs current expansion processing, and finally outputs the synchro signal, which is fed back and integrated by the operational amplifier and the integration circuit to synthesize the voltage stabilization zero point and connected to the SCOTT transformer to form a closed-loop negative feedback to achieve stable and reliable output.

[0035] Here is an example, combined with Figure 3 , the SCOTT transformer zero-power driving circuit specifically includes a second transformer T2 and a third transformer T3 constituting a SCOTT transformer, an analog switch N1, a second operational amplifier N2 to a fifth operational amplifier N5, a fourth resistor R18 to a seventh resistor R21, an eighth resistor R51 to a ninth resistor R52, a tenth resistor R54 to an eleventh resistor R55, a twelfth resistor R57 to a thirteenth resistor R58, a fourteenth resistor R38 to a sixteenth resistor R40, a nineteenth rectifier diode V55 to a twenty-fourth rectifier diode V60, a fifth capacitor C6, and a first current expansion circuit to a third current expansion circuit;

[0036] The two ends of the primary winding of the second transformer T2 are respectively input with the synchro signal DY1 and DY3, one end of the primary winding of the third transformer T3 is input with the synchro signal DY2, and the other end is connected to the center end of the primary winding of the second transformer T2, the two ends of the secondary winding of the second transformer T2 are respectively output with the line-line voltage DX1 and DX3, one end of the secondary winding of the third transformer T3 is connected to the center end of the secondary winding of the second transformer T2, and the other end outputs the line-line voltage DX2; DX1 is connected to the CO pin of the analog switch N1 through the twelfth resistor R57, DX3 The BO pin of the analog switch N1 is connected through the seventh resistor R21; the CY pin of the analog switch N1 is connected to its AX pin and the negative input terminal of the second operational amplifier N2, the positive input terminal of the second operational amplifier N2 is grounded through the ninth resistor R52, and is connected to the output terminal of the first current expansion circuit through the eighth resistor R51, the output terminal outputs the phase voltage DC1 between DX1 and the 1 / 3 terminal of the secondary winding of the third transformer T3, and the output terminal of the second operational amplifier N2 is connected to the input terminal of the first current expansion circuit; the CX pin and BY pin of the analog switch N1 are connected to the third operational amplifier N The negative input terminal of the third operational amplifier N3 is connected to the ground through the sixth resistor R20, and is connected to the output terminal of the second current expansion circuit through the fourteenth resistor R38. The output terminal outputs the phase voltage DC3 between DX3 and the 1 / 3 terminal of the secondary winding of the third transformer T3. The output terminal of the third operational amplifier N3 is connected to the input terminal of the second current expansion circuit; the BX pin and the AY pin of the analog switch N1 are connected to the negative input terminal of the fourth operational amplifier N4, and the positive input terminal of the fourth operational amplifier N4 is grounded through the fourth resistor R18, and is connected to the third through the fifth resistor R19. The output end of the current expansion circuit outputs the phase voltage DC2 between DX2 and the 1 / 3 end of the secondary winding of the third transformer T3; the A pin, B pin, and C pin of the analog switch N1 are connected to the +Vz voltage through the eleventh resistor R55 and the thirteenth resistor R58 connected in series, and the common end of the eleventh resistor R55 and the thirteenth resistor R58 is the analog switch control terminal K; the VDD pin of the analog switch N1 is connected to the +Vz voltage, and the VSS pin, VEE pin, and INH pin are connected to the -Vz voltage; DX2 is connected to the AO pin of the analog switch N1 through the tenth resistor R54;The cathodes of the nineteenth rectifier diodes V55 to the twenty-first rectifier diodes V57 are connected to the negative input terminal of the fifth operational amplifier N5 through the fifteenth resistor R39, the anodes of the twenty-second rectifier diodes V58 to the twenty-fourth rectifier diodes V60 are connected to the negative input terminal of the fifth operational amplifier N5 through the sixteenth resistor R40, the anode of the nineteenth rectifier diode V55 is connected to the cathode of the twenty-fourth rectifier diode V60, and is also connected to the output terminal of the first current expansion circuit, the anode of the twentieth rectifier diode V56 is connected to the cathode of the twenty-third rectifier diode V59, and is also connected to the output terminal of the second current expansion circuit, the anode of the twenty-first rectifier diode V57 is connected to the cathode of the twenty-second rectifier diode V58, and is also connected to the output terminal of the third current expansion circuit; the 1 / 3 terminal C of the secondary winding of the third transformer T3 is connected to the output terminal of the fifth operational amplifier N5, and is also connected to the negative input terminal of the fifth operational amplifier N5 through the fifth capacitor C6. ;

[0037] The specific analysis of the above circuit is as follows: T2 and T3 form a SCOTT transformer, which isolates and transforms the input synchro or resolver signal into a standard three-phase synchronous signal, which is switched to the operational amplifier N2-N4 through the analog switch N1 to amplify the required line-to-line voltage, and at the same time, the current is expanded, and finally a 25VA synchro signal is output. Finally, the signal is fed back and integrated by the operational amplifier N5, the voltage zero point is synthesized and connected to the terminal C of the SCOTT transformer to form a closed-loop negative feedback. The input signals DY1, DY2, and DY3 are synchro signals, A and B are the center terminals of the primary and secondary windings of T2, and C is the 1 / 3 terminal of the secondary side of T3. Now calculate the phase voltage between the line-to-line voltages DX1, DX2, and DX3 of DX1, DX2, and DX3 and point C.

[0038] The original side has

[0039] U DY1-DY3 =90V×sinθ

[0040] U DY3-DY2 =90V×sin(θ+120°)

[0041] U DY2-DY1 =90V×sin(θ+240°)

[0042]

[0043]

[0044] The secondary side has

[0045]

[0046]

[0047]

[0048]

[0049]

[0050]

[0051]

[0052] Compare the phase voltage between DX1, DX2, DX3 and point C and the line-to-line voltage between DX1, DX2, DX3. Figure 4 The line-to-line voltage of DX1, DX2, and DX3 is 6.72V, and the phase voltage between DX1, DX2, DX3 and point C is DX1, DX2, and DX3 are amplified and expanded in phase to generate output signals DC1, DC2, and DC3. Assume here that C is isolated and K is suspended.

[0053]

[0054]

[0055]

[0056] It can be seen that the line-to-line voltages of DC1, DC2, and DC3 are

[0057]

[0058]

[0059]

[0060] That is, the line-to-line voltages of DC1, DC2, and DC3 are

[0061] The above discussion assumes that C is an isolated ground. In practical applications, in order to avoid the external three-phase load of the power driver from being offset, the present invention innovatively introduces the concept of "floating ground", and the three-phase voltage signal output by the power drive circuit is respectively passed through an integrating circuit to generate a "floating ground" signal, and then the neutral ground c formed after the SCOTT transformer is directly connected to the "floating ground" signal, so that the output reference of the power drive signal changes in real time with the offset of the load, thereby avoiding the power drive circuit from being burned due to overcurrent when the static operating point is offset or the load is unbalanced, and ensuring the stable operation of the entire drive circuit and system.

[0062] Further, in one embodiment, in combination Figure 5, the first current expansion circuit to the third current expansion circuit all include a sixth operational amplifier N6, a seventeenth resistor R1 to a twentieth resistor R4, a twenty-first resistor R8, a twenty-second resistor R9, a twenty-third resistor R14, a twenty-fourth resistor R16, a twenty-fifth resistor R37, a sixth capacitor C1, a seventh capacitor C8, an eighth capacitor C9, a ninth capacitor C13, a first diode V33, a second diode V25, a third diode V32, a fourth diode V38, a fifth diode V43, a sixth diode V44, a first NPN transistor V7, a second NPN transistor V2, a third NPN transistor V10, a fourth NPN transistor V19, a fifth NPN transistor V22, a first PNP transistor V1, and a second PNP transistor V13;

[0063] The positive input terminal of the sixth operational amplifier N6 is grounded through the eighteenth resistor R2, and is connected to one end of the twenty-second resistor R9 and the emitter of the fourth NPN transistor V19 through the nineteenth resistor R3 and the ninth capacitor C13 connected in parallel. The other end of the twenty-second resistor R9 is grounded through the eighth capacitor C9 and is connected to the phase voltage DC1; the output terminal of the sixth operational amplifier N6 is connected to the anode of the first diode V33 and the base of the first NPN transistor V7, the cathode of the first diode V33 is connected to the +VC voltage, the collector of the first NPN transistor V7 is connected to the anode of the second diode V25 and the emitter of the first PNP transistor V1, and is connected to the +VP voltage through the twentieth resistor R4, the base of the first NPN transistor V7 is connected to INH1, the emitter is grounded through the twenty-third resistor R14 and the seventh capacitor C8 connected in parallel, the collector is connected to the base of the second NPN transistor V2, and is connected to the third diode V32, the fourth diode V38, and the fifth diode V43 connected in series. The collector of the third NPN transistor V10 and the base of the second PNP transistor V13 are also grounded through the sixth capacitor C1; the collector of the second NPN transistor V2 is connected to the cathode of the second diode V25 and the collector of the fourth NPN transistor V19, and is also connected to the +VP voltage through the seventeenth resistor R1, and the emitter of the second NPN transistor V2 is connected to the base of the fourth NPN transistor V19 and the emitter of the second PNP transistor V13 through the twenty-first resistor R8; the fourth NPN transistor The emitter of the transistor V19 is connected to the collector of the fifth NPN transistor V22, the base of the fifth NPN transistor V22 is connected to the collector of the second PNP transistor V13, the emitter of the fifth NPN transistor V22 is connected to the anode of the sixth diode V44, and is connected to the -VP voltage through the twenty-fifth resistor R37, the base of the third NPN transistor V10 is connected to INH2, and the emitter is connected to the cathode of the sixth diode V44, and is connected to the -VP voltage through the twenty-fourth resistor R16.

[0064] Here, the current expansion circuit only amplifies the current, and the amplitude of the output voltage is determined by the amplification factor of the proportional op amp and the power supply amplitude. V33 protects the output voltage of N1 from being higher than +VC, and R14 greatly increases the input impedance of the current expansion circuit, that is, reduces the current required from N1; V1 and V10 are bias circuits, which are controlled by INH1 and INH2 (overheat indication and DIS can change the voltages of INH1 and INH2). If INH1 is lower than the voltage of +VP by 0.7V and INH2 is higher than the voltage of -VP by 0.7V, V1 and V10 will be turned on, and V2, V19, V13, and V22 will form a Darlington tube to further amplify the current.

[0065] Further, in one embodiment, in combination Figure 6 The measurement and control protection circuit specifically includes a first comparator N7, a second comparator N8, a seventh operational amplifier N9 to a ninth operational amplifier N11, a first optical coupler isolator E1, a second optical coupler isolator E2, a variable resistor R61, a twenty-sixth resistor R22, a twenty-seventh resistor R23, a twenty-eighth resistor R47, a twenty-ninth resistor R45, a thirtieth resistor R50, a thirty-first resistor R44, a thirty-second resistor R48, a thirty-third resistor R34, a thirty-fourth resistor R27, a thirty-fifth resistor R33, a thirty-sixth resistor R49, The thirty-seventh resistor R80, the thirty-eighth resistor R60, the thirty-ninth resistor R31, the fortieth resistor R30, the forty-first resistor R35, the forty-second resistor R61, the forty-third resistor R25, the forty-fourth resistor R26, the forty-fifth resistor R30, the forty-sixth resistor R29, the forty-seventh resistor R32, the seventh diode V46 to the fifteenth diode V54, the sixth NPN transistor V16, the seventh NPN transistor V18, the ninth PNP transistor V17, the voltage regulator V61, and the tenth capacitor C20 to the twelfth capacitor C22;

[0066] The negative input terminal of the first comparator N7 is grounded, the positive input terminal is connected to the +Vz voltage through the variable resistor R61, and is also connected to the -Vz voltage through the twenty-sixth resistor R22, and is connected to the output terminal of the first comparator N7 through the twenty-seventh resistor R23, the output terminal of the first comparator N7 is connected to the cathode of the thirteenth diode V52, the anode of the thirteenth diode V52 is connected to the anode of the tenth diode V49 and the pin 4 of the second optical coupler isolator E2, and is connected to the +Vc voltage through the twenty-eighth resistor R47, the pin 6 of the second optical coupler isolator E2 is connected to the cathode of the voltage regulator tube V61, the anode of the voltage regulator tube V61 is connected to the -Vc voltage, the pin 3 of the second optical coupler isolator E2 is connected to +5V, and is connected to the second The nineteenth resistor R45 is connected to the collector of the seventh NPN transistor V18 and outputs BIT, the pin 1 of the second optocoupler isolator E2 is connected to the base of the seventh NPN transistor V18, and is grounded through the thirtieth resistor R50, and the emitter of the seventh NPN transistor V18 is grounded; the output end of the first comparator N7 is connected to the cathode of the fifteenth diode V54 through the thirty-first resistor R44, the anode of the fifteenth diode V54 is connected to the cathode of the fourteenth diode V53 and the pin 2 of the first optocoupler isolator E1, the anode of the cathode of the fourteenth diode V53 is grounded, the pin 4 of the first optocoupler isolator E1 is connected to +5V through the thirty-second resistor R48, and the pins 3 and 6 are connected to the +Vz voltage and DI respectively. S signal, pin 1 is connected to the base of the sixth NPN transistor V16, and is connected to the base of the ninth PNP transistor V17 through the thirty-third resistor R34 and grounded, the collector of the sixth NPN transistor V16 is connected to INH1, and is connected to the +Vp voltage through the thirty-fourth resistor R27, the emitter of the sixth NPN transistor V16 is connected to the emitter of the ninth PNP transistor V17 through the thirty-fifth resistor R33, the collector of the ninth PNP transistor V17 is connected to INH2, and is connected to the -Vp voltage through the thirty-sixth resistor R49; the positive input terminal of the second comparator N8 is grounded, and the negative input terminal is connected to the overcurrent indication signal through the thirty-seventh resistor R80, and is connected to the overcurrent indication signal through the thirty-eighth resistor R60 The output terminal of the second comparator N8 is connected to the anode of the eighth diode V47, the cathode of the eighth diode V47 is connected to the positive input terminal of the seventh operational amplifier N9 through the thirty-ninth resistor R31, the positive input terminal of the seventh operational amplifier N9 is also grounded through the forty-first resistor R35 and the tenth capacitor C20 connected in parallel, the negative input terminal of the seventh operational amplifier N9 is connected to its output terminal, and is connected to the negative input terminal of the eighth operational amplifier N10 and the anode of the twelfth diode V51 through the forty-second resistor R61 and the ninth diode V48 connected in parallel, the anode of the twelfth diode V51 is connected to the positive input terminal of the eighth operational amplifier N10, and the negative input terminal of the eighth operational amplifier N10 is grounded through the twelfth capacitor C22;The output end of the eighth operational amplifier N10 is connected to the cathode of the tenth diode V49 and the anode of the tenth transistor V50. The cathode of the tenth transistor V50 is connected to the positive input end of the ninth operational amplifier N11 and is grounded through the forty-sixth resistor R29. At the same time, it is connected to the output end of the ninth operational amplifier N11 through the forty-seventh resistor R32. The output end outputs the CO digital signal. The negative input end of the ninth operational amplifier N11 is grounded through the fortieth resistor R30 and connected to the -VC voltage through the eleventh capacitor C21. The negative input end is simultaneously connected to one end of the forty-third resistor R25 and one end of the forty-fourth resistor R26. The other end of the forty-third resistor R25 and the other end of the forty-fourth resistor R26 are respectively connected to the anode and cathode of the seventh diode V46.

[0067] The specific analysis of the above circuit is as follows: The functions of the measurement and control protection circuit are mainly four points: DIS output prohibition, overheating, overcurrent and stalling. All control signals are photoelectrically isolated.

[0068] DIS is high level valid. When there is no overheat indication signal, DIS input is '1', the output of the three-way power drive circuit is disabled, and when the input is '0', the power drive circuit outputs normally. Specific implementation process: Assume that there is no overheat indication signal, that is, the output of N3's 6th pin is +Vc, and the input of E1's 2nd pin is in high impedance state (no current or very small current, equivalent to floating), when DIS is '1', E1's transistor works in the cut-off area, E1's 1st pin is suspended (high impedance state), V16 and V17 work in the cut-off area, INH1 is +Vp, INH2 is -Vp, the bias circuit of the three-way power drive circuit has no bias voltage, and the power drive circuit has no output; when DIS is '0', E1's transistor works in the saturation area, E Pin 1 of N3 is +Vz, V16 and V17 work in the amplification area, INH1<+Vp, INH2>-Vp, the bias circuit of the three-way power drive circuit has a bias voltage, and the power drive circuit outputs normally; assuming that there is an overheat indication signal, that is, the output of pin 6 of N3 is -Vc, at this time, the input of pin 2 of E1 is -0.7V, the emitter of the transistor of E1 is reverse biased, and it works in the cut-off area. At this time, DIS does not work, V16 and V17 work in the cut-off area, INH1 is +Vp, INH2 is -Vp, and the power drive circuit has no output.

[0069] Overheat indication implementation process: R61 is a thermistor, which has the characteristic that its resistance is small at room temperature and increases with the increase of temperature. When the temperature reaches its Curie point (130℃), the resistance increases sharply. When the power transistor in the three-way power drive circuit heats up and causes the internal temperature to reach the Curie point of R61 130℃, the voltage of pin 3 of N3 is less than the voltage of pin 2. N3 is a positive feedback connection, that is, the output of the hysteresis comparator is the negative power supply -Vc, the 4th pin of E2 is -Vc, the transistor of E2 works in the cut-off area, V18 works in the cut-off area, and the BIT output is '1'. When the internal temperature is lower than the Curie point of R61 130℃, the voltage of pin 3 of N3 is greater than the voltage of pin 2, and the output of N3 is the positive power supply +Vc. At this time, the input of pin 4 of E2 is determined by the overcurrent signal.

[0070] Overcurrent indication implementation process: The power driver output has a current limiting function, and the current limiting critical point is at the peak value of 1.0A. When the output current is very large due to reasons such as excessive load or output short circuit, reaching 1.0A, and the current of the three-way power drive circuit is provided by a pulsating power supply, so when the current is too large, although the resistance of R60 is very small, its voltage drop cannot be ignored, and the peak voltage drop is 0.2*1=0.2V. After being reversely amplified 51 times by N4, the peak voltage drop is 10.2V, and after half-wave rectification by V47 and R31 and filtering by R35 and C20, it becomes a DC voltage , the DC voltage amplitude is slightly smaller than the AC signal amplitude (the discharge time of C20 is R35*C20, which is much slower than the charging circuit), about 8.5V, and is compared with +Vz (Vz is 7.5V) after being output by the N4 voltage follower. When it is greater than +Vz, the 10-pin output of the comparator N4 is a negative power supply -Vc, the 4-pin input of E2 is -Vc+0.7V, the E2 transistor works in the cut-off region, V18 works in the cut-off region, and the BIT output is '1'. Since the comparator here is a single threshold comparator, in order to prevent interference or noise from causing the comparator to malfunction, the input terminal is connected to the capacitor C22; the role of V51 is to prevent the 8-pin input signal of N4 from being too large. When the output current of the power drive circuit is small, the voltage of the 4-pin of N4 is less than +Vz, then the 10-pin output of the comparator N4 is +Vc, and the 4-pin input of E2 is determined by the overheating signal. When there is neither overheat nor overcurrent signal, the 4th pin of E2 is +Vc, the transistor of E2 works in the saturation region, V18 works in the saturation region, and the BIT output is '0'.

[0071] Stall indication implementation process: The start circuit is connected to the start input K (see Figure 3 ) to CO (see Figure 6). The circuit structure is mainly composed of a rectangular wave generator. When there is no overcurrent signal, the output of N4's 10th pin is +Vc, the output of N4's 13th pin is +Vc-0.7V, CO output is +Vc, N4's 14th pin is +Vc / 2, and the comparator output CO is stable at +Vc. When there is an overcurrent signal, the output of N4's 10th pin is -Vc, V50 is reverse cutoff, the comparator flips, CO outputs -Vc, and the voltage of N4's 13th pin suddenly changes to -Vc / 2. The voltage of N4's 14th pin cannot suddenly change due to the action of the capacitor. At this time, the capacitor starts to discharge, and the discharge circuit is R25 and R26 in parallel, with a time constant of C21*(R25 / / R26)=0.45s; when the voltage of N4's 14th pin drops from +Vc / 2 to -Vc / 2, the comparator flips, CO outputs +Vc, and the voltage of N4's 13th pin suddenly changes to +Vc / 2. The voltage of N4's 14th pin cannot suddenly change due to the action of the capacitor. At this time, the capacitor starts to charge. Since V46 is reverse cutoff, the charging circuit is R26, and the charging time constant is C21*R26=3.9s; when the voltage of N4's 14th pin is charged again and rises to +Vc / 2, the comparator repeats itself. It can be seen that if the overcurrent signal is continuously valid (voltage is -Vc), the rectangular wave generator outputs CO as a rectangular wave with a positive and negative voltage amplitude of Vc, a period of 4.35s, a +Vc duration of 3.9s in one cycle, and a -Vc duration of 0.45s.

[0072] When K is '1',

[0073]

[0074] When K is '0',

[0075]

[0076] By comparison, the angle changes by 120°.

[0077] The synchro power driver proposed by the present invention has low power consumption, perfect protection function and high reliability, and is conducive to the popularization and application in the field of angle measurement and control.

[0078] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A synchro power driver, characterized in that: The driver includes a pulsating power supply circuit, a SCOTT transformer zero-stabilizing power driving circuit, and a measurement and control protection circuit; the pulsating power supply circuit receives a reference excitation signal, generates a signal power supply and a power power supply to provide to the measurement and control protection circuit and the SCOTT transformer zero-stabilizing power driving circuit; the SCOTT transformer zero-stabilizing power driving circuit receives a synchro or a rotary transformer signal, outputs a synchro signal after isolation and transformation, and realizes a zero-stabilizing function; the measurement and control protection circuit receives a DIS enable signal to realize an output enable shutdown function, and can monitor current and temperature information in real time and output an overheat and overcurrent indication signal BIT, and realizes an anti-blocking function by switching an angle position signal when overcurrent occurs; The SCOTT transformer zero-stabilization power driving circuit comprises a SCOTT transformer, an analog switch, an operational amplifier, a current expansion circuit, and an integration circuit; the SCOTT transformer isolates and transforms the input synchro or rotary transformer signal into a standard three-phase synchronous signal, switches the signal to the operational amplifier through the analog switch to amplify the signal to the required line-to-line voltage, and performs current expansion processing by the current expansion circuit, and finally outputs the synchro signal, which is fed back and integrated by the operational amplifier and the integration circuit to synthesize the voltage stabilization zero point and is connected to the SCOTT transformer to form a closed-loop negative feedback to achieve stable and reliable output; The SCOTT transformer zero-power driving circuit specifically includes a second transformer (T2) and a third transformer (T3) constituting a SCOTT transformer, an analog switch (N1), a second operational amplifier (N2) to a fifth operational amplifier (N5), a fourth resistor (R18) to a seventh resistor (R21), an eighth resistor (R51) to a ninth resistor (R52), a tenth resistor (R54) to an eleventh resistor (R55), a twelfth resistor (R57) to a thirteenth resistor (R58), a fourteenth resistor (R38) to a sixteenth resistor (R40), a nineteenth rectifier diode (V55) to a twenty-fourth rectifier diode (V60), a fifth capacitor (C6), and a first current expansion circuit to a third current expansion circuit; The two ends of the primary winding of the second transformer (T2) are respectively input with synchro signals DY1 and DY3; one end of the primary winding of the third transformer (T3) is input with synchro signal DY2, and the other end is connected to the center end of the primary winding of the second transformer (T2); the two ends of the secondary winding of the second transformer (T2) are respectively output with line-to-line voltages DX1 and DX3; one end of the secondary winding of the third transformer (T3) is connected to the center end of the secondary winding of the second transformer (T2), and the other end outputs the line-to-line voltage DX2; DX1 is connected to the CO pin of the analog switch (N1) through a twelfth resistor (R57); DX3 is connected to the CO pin of the analog switch (N1) through a twelfth resistor (R57); The seventh resistor (R21) is connected to the BO pin of the analog switch (N1); the CY pin of the analog switch (N1) is connected to its AX pin and the negative input terminal of the second operational amplifier (N2); the positive input terminal of the second operational amplifier (N2) is grounded through a ninth resistor (R52) and connected to the output terminal of the first current expansion circuit through an eighth resistor (R51); the output terminal outputs a phase voltage DC1 between DX1 and the 1 / 3 terminal of the secondary winding of the third transformer (T3); the output terminal of the second operational amplifier (N2) is connected to the input terminal of the first current expansion circuit; the CX pin and BY pin of the analog switch (N1) are connected to the positive input terminal of the third operational amplifier (N3); ), the positive input end of the third operational amplifier (N3) is grounded through the sixth resistor (R20), and is connected to the output end of the second current expansion circuit through the fourteenth resistor (R38), the output end outputs the phase voltage DC3 between DX3 and the 1 / 3 end of the secondary winding of the third transformer (T3), and the output end of the third operational amplifier (N3) is connected to the input end of the second current expansion circuit; the BX pin and the AY pin of the analog switch (N1) are connected to the negative input end of the fourth operational amplifier (N4), the positive input end of the fourth operational amplifier (N4) is grounded through the fourth resistor (R18), and is connected to the output end of the fourth operational amplifier (N4) through the fifth resistor (R19). The output end of the three current expansion circuits outputs a phase voltage DC2 between DX2 and the end of the 1 / 3 secondary winding of the third transformer (T3); the A pin, the B pin and the C pin of the analog switch (N1) are connected to the +Vz voltage through the eleventh resistor (R55) and the thirteenth resistor (R58) connected in series, and the common end of the eleventh resistor (R55) and the thirteenth resistor (R58) is the analog switch control terminal K; the VDD pin of the analog switch (N1) is connected to the +Vz voltage, and the VSS pin, the VEE pin and the INH pin are connected to the -Vz voltage; DX2 is connected to the AO pin of the analog switch (N1) through the tenth resistor (R54);The cathodes of the nineteenth rectifier diode (V55) to the twenty-first rectifier diode (V57) are connected to the negative input terminal of the fifth operational amplifier (N5) via the fifteenth resistor (R39), the anodes of the twenty-second rectifier diode (V58) to the twenty-fourth rectifier diode (V60) are connected to the negative input terminal of the fifth operational amplifier (N5) via the sixteenth resistor (R40), the anode of the nineteenth rectifier diode (V55) is connected to the cathode of the twenty-fourth rectifier diode (V60), and the anode of the first current expansion circuit is connected to the input terminal of the first current expansion circuit. The output end of the second current expansion circuit is connected to the positive electrode of the 20th rectifier diode (V56) and the negative electrode of the 23rd rectifier diode (V59), and the output end of the second current expansion circuit is connected to the positive electrode of the 21st rectifier diode (V57) and the negative electrode of the 22nd rectifier diode (V58), and the output end of the third current expansion circuit is connected to the positive electrode of the 23rd rectifier diode (V59), and the output end of the third current expansion circuit is connected to the positive electrode of the 21st rectifier diode (V57). The 1 / 3 terminal C of the secondary winding of the third transformer (T3) is connected to the output end of the fifth operational amplifier (N5), and the negative input end of the fifth operational amplifier (N5) is connected to the negative input end of the fifth operational amplifier (N5) through the fifth capacitor (C6).

2. The synchro power driver according to claim 1, characterized in that: The pulsating power supply circuit includes a power transformer, a rectifier diode, a voltage regulator tube, a sampling resistor, and a filter capacitor; The power transformer receives the reference excitation signal and outputs low-voltage and high-voltage AC power. The low-voltage power is full-wave rectified by the rectifier diode and the voltage regulator tube and filtered by the filter capacitor to generate a stabilized DC power supply for the measurement and control protection circuit and as a DC bias for the pulsating power supply. The high-voltage AC power is full-wave rectified and superimposed on the DC bias generated by the low-voltage power supply to serve as the power supply for the SCOTT transformer zero-power drive circuit.

3. The synchro power driver according to claim 2, characterized in that: The pulsating power supply circuit specifically includes a power transformer (T1), a first rectifier diode (V28) to a fourth rectifier diode (V31), a fifth rectifier diode (V64) to an eighteenth rectifier diode (V77), a first resistor (R56), a second resistor (R59), a third resistor (R60), and a first capacitor (C16) to a fourth capacitor (C19); the power transformer (T1) includes a primary winding and four secondary windings, wherein the two ends of the primary winding are respectively marked as end 1 and end 2, the two ends of the first secondary winding are respectively marked as end 3 and end 4, the two ends of the second secondary winding are respectively marked as end 5 and end 6, the two ends of the third secondary winding are respectively marked as end 6 and end 7, and the two ends of the fourth secondary winding are respectively marked as end 8 and end 9; the primary winding The winding receives an externally input reference excitation signal, the second secondary winding and the third secondary winding are low-voltage windings, the 6th end of the second secondary winding is grounded through a third resistor (R60), the 5th end is connected to the cathode of the twelfth rectifier diode (V71), the cathode of the seventeenth rectifier diode (V76), the anode of the fourteenth rectifier diode (V73), and the anode of the sixteenth rectifier diode (V75), the 7th end of the third secondary winding is connected to the cathode of the eleventh rectifier diode (V70), the cathode of the eighteenth rectifier diode (V77), the anode of the thirteenth rectifier diode (V72), and the anode of the fifteenth rectifier diode (V74), the anode of the twelfth rectifier diode (V71) and the anode of the eleventh rectifier diode (V70) are connected through The third capacitor (C18) is grounded, the cathode of the fourteenth rectifier diode (V73) and the cathode of the thirteenth rectifier diode (V72) are grounded via the fourth capacitor (C19), the anode of the seventeenth rectifier diode (V76) and the anode of the eighteenth rectifier diode (V77) are grounded via the second capacitor (C17), and the cathode of the fifteenth rectifier diode (V74) and the cathode of the sixteenth rectifier diode (V75) are grounded via the first capacitor (C16); the first secondary winding and the fourth secondary winding are high-voltage windings, the three ends of which are connected to the cathode of the first rectifier diode (V28) and the anode of the second rectifier diode (V29), and the four ends of which are connected to the cathode of the fourth rectifier diode (V31) and the anode of the third rectifier diode (V30). , the positive electrode of the first rectifier diode (V28) and the positive electrode of the fourth rectifier diode (V31) are grounded through the fourth capacitor (C19), and the negative electrode of the second rectifier diode (V29) and the negative electrode of the third rectifier diode (V30) are connected to +Vp; the 8th end of the fourth secondary winding is connected to the negative electrode of the seventh rectifier diode (V66) and the positive electrode of the ninth rectifier diode (V68), and the 9th end is connected to the negative electrode of the tenth rectifier diode (V69) and the positive electrode of the eighth rectifier diode (V67), and the positive electrode of the seventh rectifier diode (V66) and the positive electrode of the tenth rectifier diode (V69) are connected to -Vp; the negative electrode of the eighth rectifier diode (V67) and the negative electrode of the ninth rectifier diode (V68) are grounded through the third capacitor (C18);One end of the first resistor (R56) is connected to +Vz and the cathode of the fifth rectifier diode (V64), and the other end is connected to +VC and grounded through the first capacitor (C16), and the anode of the fifth rectifier diode (V64) is grounded; one end of the second resistor (R59) is connected to -Vz and the anode of the sixth rectifier diode (V65), and the other end is connected to -VC and grounded through the second capacitor (C17), and the cathode of the sixth rectifier diode (V65) is grounded. ; 4. The synchro power driver according to claim 1, characterized in that: The first current expansion circuit to the third current expansion circuit all include a sixth operational amplifier (N6), a seventeenth resistor (R1) to a twentieth resistor (R4), a twenty-first resistor (R8), a twenty-second resistor (R9), a twenty-third resistor (R14), a twenty-fourth resistor (R16), a twenty-fifth resistor (R37), a sixth capacitor (C1), a seventh capacitor (C8), an eighth capacitor (C9), a ninth capacitor (C13), a first diode (V33), a second diode (V25), a third diode (V32), a fourth diode (V38), a fifth diode (V43), a sixth diode (V44), a first NPN transistor (V7), a second NPN transistor (V2), a third NPN transistor (V10), a fourth NPN transistor (V19), a fifth NPN transistor (V22), a first PNP transistor (V1), and a second PNP transistor (V13); The positive input terminal of the sixth operational amplifier (N6) is grounded through an eighteenth resistor (R2), and is connected to one end of the twenty-second resistor (R9) and the emitter of the fourth NPN transistor (V19) through a nineteenth resistor (R3) and a ninth capacitor (C13) connected in parallel; the other end of the twenty-second resistor (R9) is grounded through an eighth capacitor (C9) and is connected to the phase voltage DC1; the output terminal of the sixth operational amplifier (N6) is connected to the positive electrode of the first diode (V33) and the base of the first NPN transistor (V7); the negative electrode of the first diode (V33) is connected to The collector of the first NPN transistor (V7) is connected to the anode of the second diode (V25), the emitter of the first PNP transistor (V1), and is connected to the +VP voltage through the twentieth resistor (R4). The base of the first NPN transistor (V7) is connected to INH1, the emitter is grounded through the twenty-third resistor (R14) and the seventh capacitor (C8) connected in parallel, the collector is connected to the base of the second NPN transistor (V2), and is connected to the +VP voltage through the third diode (V32), the fourth diode (V38), and the fifth diode (V43) connected in series. The collector of the third NPN transistor (V10) and the base of the second PNP transistor (V13) are connected, and are also grounded through a sixth capacitor (C1); the collector of the second NPN transistor (V2) is connected to the cathode of the second diode (V25) and the collector of the fourth NPN transistor (V19), and is also connected to the +VP voltage through a seventeenth resistor (R1); the emitter of the second NPN transistor (V2) is connected to the base of the fourth NPN transistor (V19) and the emitter of the second PNP transistor (V13) through a twenty-first resistor (R8); the fourth NPN transistor (V2) is connected to the cathode of the second diode (V25) and the collector of the fourth NPN transistor (V19), and is also connected to the +VP voltage through a seventeenth resistor (R1); the emitter of the second NPN transistor (V2) is connected to the base of the fourth NPN transistor (V19) and the emitter of the second PNP transistor (V13) through a twenty-first resistor (R8); The emitter of the N transistor (V19) is connected to the collector of the fifth NPN transistor (V22), the base of the fifth NPN transistor (V22) is connected to the collector of the second PNP transistor (V13), the emitter of the fifth NPN transistor (V22) is connected to the anode of the sixth diode (V44), and is connected to the -VP voltage through the twenty-fifth resistor (R37), the base of the third NPN transistor (V10) is connected to INH2, and the emitter is connected to the cathode of the sixth diode (V44), and is connected to the -VP voltage through the twenty-fourth resistor (R16).

5. The synchro power driver according to claim 1, characterized in that: The measurement and control protection circuit is used to realize the DIS output prohibition, overheating, overcurrent and stalling functions. All control signals are photoelectrically isolated. Specifically: DIS is valid at a high level. When there is no overheating indication signal, the DIS input is '1', the three-way power drive circuit has no bias voltage, and the output is prohibited; when the input is '0', the three-way power drive circuit has a bias voltage and the output is enabled; when overheating is indicated, when the internal temperature reaches its Curie point, the thermistor resistance increases, the hysteresis comparator output is a negative power supply, the optocoupler output is cut off, and the BIT output is '1'; when the internal temperature is lower than the Curie point , the thermistor resistance drops, the hysteresis comparator output is the positive power supply, the optocoupler output is saturated, and the BIT output is '0'; during overcurrent indication, when the peak current reaches 1.0A, the voltage of the sampling resistor in the pulsating power supply circuit is detected, and further amplification, half-wave rectification and filtering are performed, and finally the negative power supply is output through the comparator, triggering the BIT output to be '1', and the CO digital signal with a fixed period is output through the rectangular wave generator, which is connected to the analog switch control terminal K in the SCOTT transformer zero power drive circuit to achieve an angle change of 120°, thereby realizing the anti-blocking function.

6. The synchro power driver according to claim 4 or 5, characterized in that: The measurement and control protection circuit specifically includes a first comparator (N7), a second comparator (N8), a seventh operational amplifier (N9) to a ninth operational amplifier (N11), a first optical coupler isolator (E1), a second optical coupler isolator (E2), a thermistor (R61), a twenty-sixth resistor (R22), a twenty-seventh resistor (R23), a twenty-eighth resistor (R47), a twenty-ninth resistor (R45), a thirtieth resistor (R50), a thirty-first resistor (R44), a thirty-second resistor (R48), a thirty-third resistor (R34), a thirty-fourth resistor (R27), a thirty-fifth resistor (R33), a thirty-sixth resistor (R49), and a third The seventeenth resistor (R80), the thirty-eighth resistor (R60), the thirty-ninth resistor (R31), the fortieth resistor (R30), the forty-first resistor (R35), the forty-second resistor (R61), the forty-third resistor (R25), the forty-fourth resistor (R26), the forty-fifth resistor (R30), the forty-sixth resistor (R29), the forty-seventh resistor (R32), the seventh diode (V46) to the fifteenth diode (V54), the sixth NPN transistor (V16), the seventh NPN transistor (V18), the ninth PNP transistor (V17), the voltage regulator (V61), and the tenth capacitor (C20) to the twelfth capacitor (C22); The negative input terminal of the first comparator (N7) is grounded, the positive input terminal is connected to the +Vz voltage through the thermistor (R61), and is also connected to the -Vz voltage through the twenty-sixth resistor (R22), and is connected to the output terminal of the first comparator (N7) through the twenty-seventh resistor (R23), the output terminal of the first comparator (N7) is connected to the cathode of the thirteenth diode (V52), the anode of the thirteenth diode (V52) is connected to the anode of the tenth diode (V49) and the pin 4 of the second optical coupler isolator (E2), and is connected to the output terminal of the first comparator (N7) through the twenty-eighth resistor (R47). The pin 6 of the second optocoupler isolator (E2) is connected to the negative electrode of the voltage regulator tube (V61), the positive electrode of the voltage regulator tube (V61) is connected to the -Vc voltage, the pin 3 of the second optocoupler isolator (E2) is connected to +5V, and is connected to the collector of the seventh NPN transistor (V18) through the twenty-ninth resistor (R45) and outputs BIT, the pin 1 of the second optocoupler isolator (E2) is connected to the base of the seventh NPN transistor (V18), and is grounded through the thirtieth resistor (R50), and the emitter of the seventh NPN transistor (V18) is connected to the positive electrode of the voltage regulator tube (V61). The output end of the first comparator (N7) is connected to the cathode of the fifteenth diode (V54) through the thirty-first resistor (R44), the anode of the fifteenth diode (V54) is connected to the cathode of the fourteenth diode (V53) and the pin 2 of the first optical coupler isolator (E1), the anode of the cathode of the fourteenth diode (V53) is grounded, the pin 4 of the first optical coupler isolator (E1) is connected to +5V through the thirty-second resistor (R48), the pin 3 and the pin 6 are respectively connected to the +Vz voltage and the DIS signal, and the pin 1 is connected to the sixth NPN transistor (V1 6), and at the same time connected to the base of the ninth PNP transistor (V17) through a thirty-third resistor (R34) and grounded, the collector of the sixth NPN transistor (V16) is connected to INH1, and at the same time connected to the +Vp voltage through a thirty-fourth resistor (R27), the emitter of the sixth NPN transistor (V16) is connected to the emitter of the ninth PNP transistor (V17) through a thirty-fifth resistor (R33), the collector of the ninth PNP transistor (V17) is connected to INH2, and at the same time connected to the -Vp voltage through a thirty-sixth resistor (R49);The positive input terminal of the second comparator (N8) is grounded, and the negative input terminal is connected to the overcurrent indication signal through the thirty-seventh resistor (R80). At the same time, the output terminal of the second comparator (N8) and the positive electrode of the eighth diode (V47) are connected through the thirty-eighth resistor (R60). The negative electrode of the eighth diode (V47) is connected to the positive input terminal of the seventh operational amplifier (N9) through the thirty-ninth resistor (R31). The positive input terminal of the seventh operational amplifier (N9) is also grounded through the forty-first resistor (R35) and the tenth capacitor (C20) connected in parallel. The negative input terminal of the seventh operational amplifier (N9) is connected to its output terminal, and is connected to the negative input terminal of the eighth operational amplifier (N10) and the positive electrode of the twelfth diode (V51) through the forty-second resistor (R61) and the ninth diode (V48) connected in parallel. The positive electrode of the twelfth diode (V51) is connected to the positive input terminal of the eighth operational amplifier (N10). 10) is grounded through a twelfth capacitor (C22); the output end of the eighth operational amplifier (N10) is connected to the cathode of the tenth diode (V49) and the anode of the tenth triode (V50), the cathode of the tenth triode (V50) is connected to the positive input end of the ninth operational amplifier (N11), and is grounded through a forty-sixth resistor (R29), and is connected to the output end of the ninth operational amplifier (N11) through a forty-seventh resistor (R32), and the output end outputs a CO digital signal; the negative input end of the ninth operational amplifier (N11) is grounded through a forty-third resistor (R30), connected to a -VC voltage through an eleventh capacitor (C21), and the negative input end is simultaneously connected to one end of the forty-third resistor (R25) and one end of the forty-fourth resistor (R26), and the other end of the forty-third resistor (R25) and the other end of the forty-fourth resistor (R26) are respectively connected to the anode and cathode of the seventh diode (V46). ;

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