Circuit and method for converting digital signals with different attitude conversion values into rotary transformer signals

Abstract

The invention relates to a circuit and method for converting digital signals with different attitude conversion values into rotary transformer signals, and the circuit comprises a reference transformer, a phenomenon selection switch, a reference transformer detection circuit, a sine multiplier, a cosine multiplier, a digital latch, a power amplifier, an output transformer, and a reference transformer detection circuit. The reference transformer detection circuit is connected with the reference transformer and is used for ensuring the accuracy of the output of the reference transformer, and the phenomenon selection switch is connected with the reference transformer and is used for converting a sine and cosine function in a range of 0-90 degrees into a sine and cosine function in a range of 0-360 degrees; the digital quantity latch, the sine multiplier, the cosine multiplier, the power amplifier, the output transformer and the reference transformer detection circuit are sequentially connected, and the phenomenon selection switch is connected with the sine multiplier and the cosine multiplier. And the signals are converted into rotary transformer signals, so that the real-time performance and high precision of DA changes of different rotation values are ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of interface data processing for ship navigation systems, in particular to a circuit and method for converting digital signals with different rotation values into resolver signals. Background Art

[0002] A resolver (resolver / transformer) is an electromagnetic sensor, also known as a synchro resolver. It is a small AC motor used to measure angles, used to measure the angular displacement and angular velocity of the rotating shaft of a rotating object, and consists of a stator and a rotor. Among them, the stator winding serves as the primary side of the transformer and receives the excitation voltage. The excitation frequency is usually 400, 3000, 5000 HZ, etc. The rotor winding serves as the secondary side of the transformer and obtains an induced voltage through electromagnetic coupling.

[0003] The working principle of a resolver is basically similar to that of an ordinary transformer. The difference is that the primary and secondary windings of an ordinary transformer are relatively fixed, so the ratio of the output voltage to the input voltage is a constant. However, the primary and secondary windings of a resolver change their relative positions with the angular displacement of the rotor. Therefore, the magnitude of its output voltage changes with the rotor angular displacement. The voltage amplitude of the output winding has a sine or cosine function relationship with the rotor rotation angle, or maintains a certain proportional relationship, or is linear with the rotation angle within a certain rotation angle range. Resolvers can be used to transmit rotation angles or electrical signals in synchronous servo systems and digital servo systems; they can be used as function resolvers in resolver devices, so they are also called resolvers.

[0004] Resolvers generally have two structural forms: two-pole windings and four-pole windings. The stator and rotor of a two-pole winding resolver each have a pair of magnetic poles, while the four-pole winding has two pairs of magnetic poles each, mainly used in high-precision detection systems. In addition, there are also multi-pole resolvers, used in high-precision absolute detection systems.

[0005] A resolver consists of two major components: a stator and a rotor. It is a rotatable transformer, and its working principle is exactly the same as that of an ordinary transformer. Its stator winding is equivalent to the primary coil (excitation coil) of the transformer, and the rotor winding is equivalent to the secondary coil of an ordinary transformer. Resolver signals are analog signals. Because of their strong anti-interference ability and good transmission real-time performance, they are widely used in scenarios with such requirements for signals. According to the user's usage requirements, this design converts digital signals with different rotation values inside the information sending device into resolver signals for external transmission. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and propose a circuit and method for converting digital signals with different attitude conversion values into resolver signals, which can extract data as required and convert it into the form of resolver signals to ensure the real-time performance and high precision of the DA change with different conversion values.

[0007] The present invention solves its technical problems by adopting the following technical solutions:

[0008] A circuit for converting digital signals with different attitude conversion values into resolver signals, including a reference transformer, a phenomenon selection switch, a reference transformer detection circuit, a sine multiplier and a cosine multiplier, a digital latch, a power amplifier, and an output transformer and a reference transformer detection circuit. Among them, the reference transformer detection circuit is connected to the reference transformer to ensure the accuracy of the output of the reference transformer. The digital latch is respectively connected to the phenomenon selection switch and the sine multiplier and the cosine multiplier. The sine multiplier and the cosine multiplier are connected to the reference transformer. The phenomenon selection switch, the power amplifier, the output transformer, and the reference transformer detection circuit are connected in sequence.

[0009] Moreover, the reference transformer selects a resistive transformer. The resistive transformer includes three windings: an input winding N1, an error detection winding N2, and an output winding N3. The winding current of the input winding N1 is I1, the winding current of the error detection winding N2 is I2, and the winding current of the output winding N3 is I3. I0 is the no-load current, and N1I0 reflects the magnetic potential loss of the iron core magnetic conductive material. The input voltage is Ua.

[0010] Moreover, the quadrant selection switch includes analog switch 1, analog switch 2, operational amplifier N1, operational amplifier N2, operational amplifier N3, operational amplifier N4, operational amplifier N5, operational amplifier N6, resistor R1, resistor R2, resistor R3, and resistor R4. Among them, the ZA channel of analog switch 1 is connected to the positive input terminal of operational amplifier N1. The output terminal of operational amplifier N1 is respectively connected to the negative input terminal of operational amplifier N1, the Y0A pin of analog switch 2, the Y1b pin of analog switch 2, and one end of resistor R1. The other end of resistor R1 is respectively connected to one end of resistor R2 and the negative input terminal of operational amplifier N3. The positive input terminal of operational amplifier N3 is grounded. The output terminal of operational amplifier N3 is respectively connected to the other end of resistor R2, the Y2a pin of analog switch 2, and the Y3b pin of analog switch 2. The ZB channel of analog switch 1 is connected to the positive input terminal of operational amplifier N2. The output terminal of operational amplifier N2 is respectively connected to the negative input terminal of operational amplifier N2, the Y3A pin of analog switch 2, the Y0b pin of analog switch 2, and one end of resistor R3. The other end of resistor R3 is respectively connected to one end of resistor R4 and the negative input terminal of operational amplifier N4. The positive input terminal of operational amplifier N4 is grounded. The output terminal of operational amplifier N4 is respectively connected to the other end of resistor R4, the Y1a pin of analog switch 2, and the Y2b pin of analog switch 2. The ZA pin of analog switch 2 is connected to the positive input terminal of operational amplifier N5. The output terminal of operational amplifier N5 is connected to the negative input terminal of operational amplifier N5 and outputs VACosα. The ZB pin of analog switch 2 is connected to the positive input terminal of operational amplifier N6. The output terminal of operational amplifier N6 is connected to the negative input terminal of operational amplifier N5 and outputs VASinα.

[0011] Moreover, the reference transformer detection circuit includes resistor R5, resistor R6, resistor R7, resistor R8, diode H1, optocoupler E1, electrolytic capacitor C1, light-emitting diode H1, and AND gate T1. Among them, the input terminal of reference transformer RH is connected to one end of resistor R5. The input terminal of reference transformer RL is respectively connected to one end of resistor R6, the positive electrode of diode H1, and the negative input terminal of optocoupler E1. The other end of resistor R5 is respectively connected to the other end of resistor R6, the negative electrode of diode H1, and the positive input terminal of optocoupler E1. The negative output terminal of optocoupler E1 is connected to the +5V power supply. One end of resistor R7 and the negative electrode of electrolytic capacitor C1 are grounded. The other end of resistor R7, the positive electrode of electrolytic capacitor C1, and the positive output terminal of optocoupler E1 are connected to the input terminal of the AND gate. The output terminal of the AND gate is connected to the negative electrode of light-emitting diode H1. The positive electrode of light-emitting diode H1 is connected to the +5V power supply through resistor R8.

[0012] Moreover, the reference transformer detection circuit includes resistor R9, resistor R10, resistor R11, resistor R12, diode H2, optocoupler E2, electrolytic capacitor C2, light-emitting diode H2, and AND gate T2. Among them, the S2 pin of the output transformer is connected to one end of resistor R9, the S4 pin of the output transformer is connected to one end of resistor R6, the positive electrode of diode H1, and the negative input terminal of optocoupler E1. The other end of resistor R5 is respectively connected to the other end of resistor R10, the negative electrode of diode H2, and the positive input terminal of optocoupler E2. The negative output terminal of optocoupler E2 is connected to the +5V power supply. One end of resistor R11 and the negative electrode of electrolytic capacitor C2 are grounded. The other end of resistor R11, the positive electrode of electrolytic capacitor C2, and the positive output terminal of optocoupler E2 are connected to the input terminal of the AND gate. The output terminal of the AND gate is connected to the negative electrode of light-emitting diode H2, and the positive electrode of light-emitting diode H2 is connected to the +5V power supply through resistor R12.

[0013] A conversion method for a circuit that converts a digital signal with different attitude conversion values into a resolver signal is as follows:

[0014] Digital quantity signals with different conversion values are buffered and driven by a first-level digital quantity latch. The lower 10 bits or lower N bits pass through a sine multiplier and a cosine multiplier to output sinθ' and cosθ'. The higher 4 bits complete quadrant selection through a quadrant selection switch. The reference transformer converts the received RH and RL into an R0 waveform as the reference waveform for sinθ and cosθ. The output resolver signals sinθ and cosθ are output through a power amplifier and an output transformer.

[0015] The advantages and positive effects of the present invention are:

[0016] The present invention includes a reference transformer, a phenomenon selection switch, a reference transformer detection circuit, a sine multiplier, a cosine multiplier, a digital quantity latch, a power amplifier, an output transformer, and a reference transformer detection circuit. Among them, the reference transformer detection circuit is connected to the reference transformer to ensure the accuracy of the output of the reference transformer. The phenomenon selection switch is connected to the reference transformer to convert the sine and cosine functions in the range of 0 to 90° into the sine and cosine functions in the range of 0 to 360°. The digital quantity latch, the sine multiplier, the cosine multiplier, the power amplifier, the output transformer, and the reference transformer detection circuit are connected in sequence. The phenomenon selection switch is connected to the sine multiplier and the cosine multiplier. The present invention constructs a separate transmission and extraction technology, extracts data according to requirements, and converts it into the form of a resolver signal to ensure the real-time performance and high precision of the DA change with different conversion values. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the circuit diagram of the present invention;

[0018] Figure 2 is the principle of the reference transformer of the present invention;

[0019] Figure 3 This is the high four-bit sine-cosine function generation circuit of the present invention;

[0020] Figure 4 This is the resolver reference transformer information detection circuit of the present invention. Specific embodiments

[0021] The following further details the present invention in conjunction with the accompanying drawings.

[0022] The construction idea of the present invention is as follows:

[0023] After determining the reference signal sine and cosine multipliers, digital quantity signals with different rotation values are converted into sine and cosine signals representing angles. After being amplified by a power amplifier, they are isolated and boosted by an output transformer and then become four-wire resolver signals for output. The expression of the output signal is as follows:

[0024] U S1-S3 = KU RL-RH Sinθ

[0025] U S4-S2 = KU RL-RH Cosθ

[0026] In the formula, U S1-S3 , U S4-S2 are the output voltages, θ is the input digital angle, K is the proportionality coefficient, and URL-RH is the reference voltage.

[0027] The circuit for converting digital signals with different attitude rotation values into resolver signals, as Figure 1 shown, includes a reference transformer, a phase selection switch, a reference transformer detection circuit, a sine multiplier and a cosine multiplier, a digital quantity latch, a power amplifier, an output transformer, and a reference transformer detection circuit. Among them, the reference transformer detection circuit is connected to the reference transformer to ensure the accuracy of the output of the reference transformer. The digital quantity latch is respectively connected to the phase selection switch and the sine multiplier and the cosine multiplier. The sine multiplier and the cosine multiplier are connected to the reference transformer. The phase selection switch, the power amplifier, the output transformer, and the reference transformer detection circuit are connected in sequence. The sine multiplier and the cosine multiplier are used to convert the sine-cosine functions in the range of 0-90° into the sine-cosine functions in the range of 0-360°.

[0028] The reference transformer selects a resistive transformer, as Figure 2As shown in (a), the resistive transformer includes three windings: the input winding N1, the error detection winding N2, and the output winding N3. The current flowing through the input winding N1 is I1, the current flowing through the error detection winding N2 is I2, and the current flowing through the output winding N3 is I3. I0 is the no-load current, and N1I0 reflects the magnetic potential loss of the iron core magnetic conductive material, such as Figure 2 As shown in (b), according to the law of total current, the sum of magnetic potential losses in any closed loop is zero.

[0029] Suppose an input voltage Ua is applied at a certain moment, with the polarity as shown in Figure (a). Then the magnetic potential direction generated by the winding N1 is downward, and its value is N1I1. Through the linkage of the magnetic flux in the iron core, an induced current I2 is generated in the error detection winding, and the direction is as Figure 2 , the magnetic potential direction of N2I2 is upward, canceling the effect of N1I1. After I2 is applied to the circuit composed of an operational amplifier, the amplifier outputs a current I3. Flowing through the N3 winding, there is also an upward magnetic potential N3I3. Selecting excellent iron core magnetic conductive materials can make I0 extremely small, and N1I0 can be regarded as a fixed value, which does not change with the size of the input signal. The current value I2 is also very small because the amplifier circuit has a very high input impedance, and the input loop current is extremely small. Thus, it can be approximately considered that N1I1 = N3I3 + C (C is a constant, C = N1I0 + N2I2)

[0030] I1 is determined by the input voltage Ua and the resistor R. I1 is linear with Ua and does not change with the load impedance. By passing I3 through a resistor, the signal of Ua can be repeated, which is completely different from the commonly used voltage source transformer: the primary current I1 of the voltage source transformer can change with the load current.

[0031] Such as Figure 3As shown in the figure, the quadrant selection switch includes analog switch 1, analog switch 2, operational amplifier N1, operational amplifier N2, operational amplifier N3, operational amplifier N4, operational amplifier N5, operational amplifier N6, resistor R1, resistor R2, resistor R3, and resistor R4. Among them, the ZA channel of analog switch 1 is connected to the positive input terminal of operational amplifier N1. The output terminal of operational amplifier N1 is respectively connected to the negative input terminal of operational amplifier N1, the Y0A pin of analog switch 2, the Y1b pin of analog switch 2, and one end of resistor R1. The other end of resistor R1 is respectively connected to one end of resistor R2 and the negative input terminal of operational amplifier N3. The positive input terminal of operational amplifier N3 is grounded. The output terminal of operational amplifier N3 is respectively connected to the other end of resistor R2, the Y2a pin of analog switch 2, and the Y3b pin of analog switch 2. The ZB channel of analog switch 1 is connected to the positive input terminal of operational amplifier N2. The output terminal of operational amplifier N2 is respectively connected to the negative input terminal of operational amplifier N2, the Y3A pin of analog switch 2, the Y0b pin of analog switch 2, and one end of resistor R3. The other end of resistor R3 is respectively connected to one end of resistor R4 and the negative input terminal of operational amplifier N4. The positive input terminal of operational amplifier N4 is grounded. The output terminal of operational amplifier N4 is respectively connected to the other end of resistor R4, the Y1a pin of analog switch 2, and the Y2b pin of analog switch 2. The ZA pin of analog switch 2 is connected to the positive input terminal of operational amplifier N5. The output terminal of operational amplifier N5 is connected to the negative input terminal of operational amplifier N5 and outputs VACosα. The ZB pin of analog switch 2 is connected to the positive input terminal of operational amplifier N6. The output terminal of operational amplifier N6 is connected to the negative input terminal of operational amplifier N5 and outputs VASinα.

[0032] Figure 3 The input of the analog switch in it is connected to the reference signal. The five signals A, B, C, D, and E on the left side of the analog switch respectively represent 0, sin22.5°, sin45°, sin67.5°, and 1. The signals A1, A2, A3, and A4 on the left side participating in function control respectively represent 90°, 180°, 22.5°, and 45°. Y0A, Y1A, Y2A, and Y3A inside the analog switch are the input ports of the A channel of the analog switch, and Y0B, Y1B, Y2B, and Y3B are the input ports of the B channel of the analog switch. ZA and ZB are respectively the output terminals of the analog switch. Its A channel selects the cosine function in the first quadrant, and the B channel selects the sine function in the first quadrant. Thus, under the control of function control bits A3 and A4, the analog switch generates the sine and cosine functions with a phase interval of 22.5° in the first quadrant.

[0033] The input of the analog switch is connected to the reference signal. Its channel A selects the cosine function in the first quadrant, and channel B selects the sine function in the first quadrant. Thus, under the control of function control bits A3 and A4, the analog switch generates sine and cosine functions with a phase interval of 22.5° in the first quadrant.

[0034] After the resolver information is output, in order to ensure the accuracy of the information output, it is necessary to detect the reference transformer. By reducing the resolver voltage, controlling the direction through a diode, and then controlling the operation of the light-emitting diode through an optocoupler and a NAND gate, the detected information is displayed in the form of an indicator light. As Figure 4 shown, the reference transformer detection circuit includes resistor R5, resistor R6, resistor R7, resistor R8, diode H1, optocoupler E1, electrolytic capacitor C1, light-emitting diode H1, and NAND gate T1. Among them, one end of resistor R5 is connected to the input end of reference transformer RH, and one end of resistor R6, the positive electrode of diode H1, and the negative input end of optocoupler E1 are respectively connected to the input end of reference transformer RL. The other end of resistor R5 is respectively connected to the other end of resistor R6, the negative electrode of diode H1, and the positive input end of optocoupler E1. The negative output end of optocoupler E1 is connected to the +5V power supply. One end of resistor R7 and the negative electrode of electrolytic capacitor C1 are grounded. The other end of resistor R7, the positive electrode of electrolytic capacitor C1, and the positive output end of optocoupler E1 are connected to the input end of the NAND gate. The output end of the NAND gate is connected to the negative electrode of light-emitting diode H1, and the positive electrode of light-emitting diode H1 is connected to the +5V power supply through resistor R8.

[0035] The reference transformer detection circuit includes resistor R9, resistor R10, resistor R11, resistor R12, diode H2, optocoupler E2, electrolytic capacitor C2, light-emitting diode H2, and NAND gate T2. Among them, the S2 pin of the output transformer is connected to one end of resistor R9, and the S4 pin of the output transformer is connected to one end of resistor R6, the positive electrode of diode H1, and the negative input end of optocoupler E1. The other end of resistor R5 is respectively connected to the other end of resistor R10, the negative electrode of diode H2, and the positive input end of optocoupler E2. The negative output end of optocoupler E2 is connected to the +5V power supply. One end of resistor R11 and the negative electrode of electrolytic capacitor C2 are grounded. The other end of resistor R11, the positive electrode of electrolytic capacitor C2, and the positive output end of optocoupler E2 are connected to the input end of the NAND gate. The output end of the NAND gate is connected to the negative electrode of light-emitting diode H2, and the positive electrode of light-emitting diode H2 is connected to the +5V power supply through resistor R12.

[0036] A conversion method for a circuit that converts a digital signal with different attitude conversion values into a resolver signal is as follows:

[0037] After the digital quantity signals with different conversion values are buffered and driven by a first-level digital quantity latch, the lower 10 bits or lower N bits pass through a sine multiplier and a cosine multiplier to output sinθ' and cosθ'. The higher 4 bits complete the quadrant selection through a quadrant selection switch. The reference transformer converts the received RH and RL into an R0 waveform as the reference waveform for sinθ and cosθ. The output resolver signals sinθ and cosθ are output through a power amplifier and an output transformer.

[0038] It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive. Therefore, the present invention includes, but is not limited to, the embodiments described in the specific embodiments. Any other embodiments obtained by those skilled in the art based on the technical solutions of the present invention also fall within the scope of protection of the present invention.

Claims

1. A circuit for converting digital signals of different attitude values ​​into resolver signals, characterized in that: It includes a reference transformer, a phenomenon selection switch, a reference transformer detection circuit, a sine multiplier and a cosine multiplier, a digital latch, a power amplifier, an output transformer and a reference transformer detection circuit, wherein the reference transformer detection circuit is connected to the reference transformer to ensure the accuracy of the reference transformer output, the digital latch is respectively connected to the phenomenon selection switch and the sine multiplier and the cosine multiplier, the sine multiplier and the cosine multiplier are connected to the reference transformer, and the phenomenon selection switch power amplifier and the output transformer and the reference transformer detection circuit are connected in sequence.

2. The circuit for converting digital signals with different attitude conversion values ​​into resolver signals according to claim 1, characterized in that: The reference transformer is a resistive transformer, which includes three windings: an input winding N1, an error detection winding N2 and an output winding N3. The winding current of the input winding N1 is I1, the winding current of the error detection winding N2 is I2, the winding current of the output winding N3 is I3, I0 is the no-load current, N1I0 reflects the magnetic potential loss of the magnetic conductive material of the iron core; the input voltage is Ua.

3. The circuit for converting digital signals with different attitude conversion values ​​into resolver signals according to claim 1, characterized in that: The quadrant selection switch includes analog switch 1, analog switch 2, operational amplifier N1, operational amplifier N2, operational amplifier N3, operational amplifier N4, operational amplifier N5, operational amplifier N6, resistor R1, resistor R2, resistor R3 and resistor R4, wherein the ZA channel of analog switch 1 is connected to the positive input terminal of operational amplifier N1, the output terminal of operational amplifier N1 is respectively connected to the negative input terminal of operational amplifier N1, the Y0A pin of analog switch 2, the Y1b pin of analog switch 2 and one end of resistor R1, the other end of resistor R1 is respectively connected to one end of resistor R2 and the negative input terminal of operational amplifier N3, the positive input terminal of operational amplifier N3 is grounded, the output terminal of operational amplifier N3 is respectively connected to the other end of resistor R2, the Y2a pin of analog switch 2 and the Y3b pin of analog switch 2, the ZB channel of analog switch 1 is connected to the Y0A pin of analog switch 2, the Y1b pin of analog switch 2 and one end of resistor R1, the other end of resistor R1 is respectively ... The positive input terminal of the amplifier N2 and the output terminal of the operational amplifier N2 are respectively connected to the negative input terminal of the operational amplifier N2, the Y3A pin of the analog switch 2, the Y0b pin of the analog switch 2 and one end of the resistor R3, the other end of the resistor R3 is respectively connected to one end of the resistor R4 and the negative input terminal of the operational amplifier N4, the positive input terminal of the operational amplifier N4 is grounded, the output terminal of the operational amplifier N4 is respectively connected to the other end of the resistor R4, the Y1a pin of the analog switch 2 and the Y2b pin of the analog switch 2, the ZA pin of the analog switch 2 is connected to the positive input terminal of the operational amplifier N5, the output terminal of the operational amplifier N5 is connected to the negative input terminal of the operational amplifier N5 and outputs VACosα, the ZB pin of the analog switch 2 is connected to the positive input terminal of the operational amplifier N6, the output terminal of the operational amplifier N6 is connected to the negative input terminal of the operational amplifier N5 and outputs VASinα.

4. The circuit for converting digital signals with different attitude conversion values ​​into resolver signals according to claim 1, characterized in that: The reference transformer detection circuit includes a resistor R5, a resistor R6, a resistor R7, a resistor R8, a diode H1, an optocoupler E1, an electrolytic capacitor C1, a light emitting diode H1 and an AND gate T1, wherein an input end of the reference transformer RH is connected to one end of the resistor R5, an input end of the reference transformer RL is respectively connected to one end of the resistor R6, the positive electrode of the diode H1 and the negative input end of the optocoupler E1, the other end of the resistor R5 is respectively connected to the other end of the resistor R6, the negative electrode of the diode H1 and the positive input end of the optocoupler E1, the negative output end of the optocoupler E1 is connected to a +5V power supply, one end of the resistor R7 and the negative electrode of the electrolytic capacitor C1 are grounded, the other end of the resistor R7, the positive electrode of the electrolytic capacitor C1 and the positive output end of the optocoupler E1 are connected to the input end of the AND gate, the output end of the AND gate is connected to the negative electrode of the light emitting diode H1, and the positive electrode of the light emitting diode H1 is connected to the +5V power supply through the resistor R8.

5. The circuit for converting digital signals with different attitude conversion values ​​into resolver signals according to claim 1, characterized in that: The reference transformer detection circuit includes a resistor R9, a resistor R10, a resistor R11, a resistor R12, a diode H2, an optocoupler E2, an electrolytic capacitor C2, a light emitting diode H2 and an AND gate T2, wherein the S2 pin of the output transformer is connected to one end of the resistor R9, the S4 pin of the output transformer is connected to one end of the resistor R6, the positive electrode of the diode H1 and the negative input end of the optocoupler E1, the other end of the resistor R5 is respectively connected to the other end of the resistor R10, the negative electrode of the diode H2 and the positive input end of the optocoupler E2, the negative output end of the optocoupler E2 is connected to a +5V power supply, one end of the resistor R11 and the negative electrode of the electrolytic capacitor C2 are grounded, the other end of the resistor R11, the positive electrode of the electrolytic capacitor C2 and the positive output end of the optocoupler E2 are connected to the input end of the AND gate, the output end of the AND gate is connected to the negative electrode of the light emitting diode H2, and the positive electrode of the light emitting diode H2 is connected to the +5V power supply through the resistor R12.

6. A conversion method for a circuit of converting a digital signal with different posture conversion values ​​into a rotary transformer signal as described in any one of claims 1 to 5 is as follows: after the digital quantity signal with different conversion values ​​is buffered and driven by a primary digital quantity latch, the lower 10 bits or the lower N bits are outputted as sinθ' and cosθ' by a sine multiplier and a cosine multiplier, and the upper 4 bits complete the quadrant selection through a quadrant selection switch, the reference transformer converts the received RH and RL into an R0 waveform as a reference waveform of sinθ and cosθ, and the output rotary transformer signals sinθ and cosθ are outputted through a power amplifier and an output transformer.

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