CN105281771A - Bipolar voltage-controlled oscillator and control method thereof for R/D converter - Google Patents
Bipolar voltage-controlled oscillator and control method thereof for R/D converter Download PDFInfo
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Abstract
The invention relates to a bipolar voltage-controlled oscillator and a control method thereof for an R/D converter. The bipolar voltage-controlled oscillator comprises an integrator circuit. An input terminal of the integrator circuit is connected with an external voltage source, and an output terminal is connected with an anti-oscillation-stop protection circuit, a dual-threshold comparison circuit and a polarity detection circuit. An output terminal of the anti-oscillation-stop protection circuit is connected with a control terminal of the integrator circuit. An output terminal of the dual-threshold comparison circuit is connected with an input terminal of a second monostabtle pulse shaping circuit via a first monostabtle pulse shaping circuit. An output terminal of the polarity detection circuit is connected with a discharge selection control terminal of a two-way constant current source circuit. An output terminal of the two-way constant current source circuit is connected with the input terminal of the integrator circuit via a discharge loop control circuit. An output terminal of the first monostabtle pulse shaping circuit is connected with a control terminal of the discharge loop control circuit. The invention makes it possible to receive bipolar direct-current voltage input, and satisfies the technical requirements on bipolar voltage-controlled oscillators needed by continuous tracking-type R/D converters.
Description
Technical field
The present invention relates to R/D converter analog-figure tracking loop circuit design field, be specifically related to a kind of for the bipolarity voltage controlled oscillator in R/D transducer and control method thereof.
Background technology
R/D transducer is one of Primary Component in shaft angle servo-control system, in systems in which for changing the digitlization of position/angles analog quantity, and being connected with host computer by standard interface circuit, realizing the real-time reading of data message.R/D converter application, in the important weapon systems such as space flight, aviation, weapons, naval vessel, is also widely used in numerous civilian SERVO CONTROL fields such as Digit Control Machine Tool servomechanism, automobile electric power-assisted steering measurement, engine movements Detection & Controling and scanning, search, location, navigation, measurement.
R/D transducer belongs to analog/digital Continuous Tracking type change-over circuit, therefore in the analog to digital tracking loop circuit of R/D transducer, a kind of special voltage controlled oscillator must be designed: require that there is the input of reception bipolarity direct voltage, produce the digit pulse of Transistor-Transistor Logic level positive logic to export, and the characteristic that pulse frequency is directly proportional to input voltage absolute amplitude; In addition, according to the logic control needs of rear class reversible counting latch circuit, this voltage controlled oscillator also needs to have following specific function: exporting the trailing edge generation latch pulse LATCH of count pulse BUSY, the polarity according to input voltage, produce the TTL logic level DIR signal controlling plus/minus counting direction, the inhibit signal INHIBIT receiving outside input, the generation of LATCH pulse can be forbidden, and don't affect the normal output of BUSY pulse.
At present, conventional voltage controlled oscillator design cannot meet the above-mentioned specific demand of R/D transducer, as the voltage controlled oscillator AD560 of AD company of the U.S., its voltage is input as unipolarity, and without the logic level DIR signal etc. of count pulse BUSY, latch pulse LATCH, counting direction, a kind of bipolarity voltage controlled oscillator meeting R/D transducer track demand therefore must be designed.
Summary of the invention
The object of the present invention is to provide one can receive the input of bipolarity direct voltage, produce the digit pulse of Transistor-Transistor Logic level positive logic to export, and pulse frequency be directly proportional to input voltage absolute amplitude for the bipolarity voltage controlled oscillator in R/D transducer and control method thereof.
For achieving the above object, present invention employs following technical scheme:
For the bipolarity voltage controlled oscillator in R/D transducer, comprise integrator circuit, double threshold comparison circuit, the first monostable pulses shaping circuit, discharge loop control circuit, the second monostable pulses shaping circuit, polarity detection circuit, bidirectional constant source circuit and anti-fault protection circuit, the input of described integrator circuit is connected with voltage source, its output respectively with anti-fault protection circuit, double threshold comparison circuit is connected with polarity detection circuit, the output of described anti-fault protection circuit is connected with integrating circuit discharge switch control end, the output of described double threshold comparison circuit is connected through the input of the first monostable pulses shaping circuit with the second monostable pulses shaping circuit, the output of described polarity detection circuit is connected with bidirectional constant source circuit selector switch control end, the output of bidirectional constant source circuit is connected with the input of integrating circuit through discharge loop control circuit, the output of described first monostable pulses shaping circuit is connected with the input of discharge loop control circuit.
Further, described integrator circuit comprises integrated transporting discharging U0A, single-pole double-throw switch (SPDT) K3, resistance R2 and electric capacity C1, the in-phase input end ground connection of described integrated transporting discharging U0A, its reverse input end is connected with external voltage source through resistance R1, its output is connected with the moved end of single-pole double-throw switch (SPDT) K3 through resistance R2, the not moved end of single-pole double-throw switch (SPDT) K3 is connected with the reverse input end of integrated transporting discharging U0A, the output of integrated transporting discharging U0A is connected with the input of anti-fault protection circuit, one end of described electric capacity C1 is connected with the reverse input end of integrated transporting discharging U0A, its other end is connected with the output of integrated transporting discharging U0A.
Further, described double threshold comparison circuit comprises comparator U1A and comparator U1B, the input in the same way of described comparator U1A is connected with input voltage source respectively with the reverse input end of comparator U1B, the reverse input end of comparator U1A is all connected with the output of integrator circuit with the in-phase input end of comparator U1B, the output of comparator U1B is connected with the input of the output of comparator U1A and the first monostable pulses shaping circuit, and the output of comparator U1A is connected with power supply VCC through resistance R4.
Further, described first monostable pulses shaping circuit adopts monostable flipflop U4A, described second monostable pulses shaping circuit adopts monostable flipflop U4B, the input trailing edge of described monostable flipflop U4A is connected with the output of double threshold comparison circuit, its input rising edge is connected with the output of monostable flipflop U4B, the input trailing edge ground connection of monostable flipflop U4B, its input rising edge is connected with the output of monostable flipflop U4A.
Further, described polarity detection circuit comprises comparator U3C, resistance R5, R6, R7, R8, R9, R10, diode D1, the in-phase input end of described comparator U3C is through resistance R7 ground connection, and its reverse input end is connected with the output of integrator circuit after R6 parallel connection through resistance R5, and its output is connected with the anode of diode D1 through resistance R9, the negative electrode of diode D1 is through resistance R10 ground connection, and the negative electrode of described diode D1 is signal output part.
Further, described discharge loop control circuit adopts single-pole double-throw switch (SPDT) K1, described bidirectional constant source circuit comprises single-pole double-throw switch (SPDT) K2, resistance R2 and R3, the control end of described single-pole double-throw switch (SPDT) K1 is connected with the output of the first monostable pulses shaping circuit, it is not connected with the reverse input end of integrator circuit moved end, the moved end of described single-pole double-throw switch (SPDT) K2 is connected with the moved end of single-pole double-throw switch (SPDT) K1, its not moved end respectively through resistance R3, R4 is connected with input voltage source, the described control end of single-pole double-throw switch (SPDT) K2 is connected with the output of polarity detection circuit.
Further; described anti-fault protection circuit comprises comparator U2A, U2B and XOR gate U5; the in-phase input end of described comparator U2A is connected with input voltage source respectively with the reverse input end of comparator U2B; the reverse input end of comparator U2A is all connected with the output of integrator circuit with the in-phase input end of comparator U2B; the described output of comparator U2A with U2B is connected with the input of XOR gate U5, and the output of XOR gate U5 is connected with the control end of single-pole double-throw switch (SPDT) K3 in integrator circuit.
For a control method for the bipolarity voltage controlled oscillator in R/D transducer, comprise the following steps:
(1) bipolarity direct voltage Ui inputs, and through the resistance R1 of series connection, carries out two-way charging, export the voltage contrary with Ui polarity of voltage to the integrating capacitor C1 of described active integrator U0A;
(2) the two-way output voltage of electric capacity C1 charging acquisition, input by window comparator U1A and U1B of+1.1V and-1.1V as two comparison threshold, this window comparator produces by the negative saltus step pulse falling edge of logical one to logical zero;
(3) the negative saltus step pulse falling edge described in, input integral type monostable pulses shaping circuit U4A, make U4A export Q end and produce count pulse BUSY signal, pulse duration is determined by the time constant of R13 and C3, and U4A exports the non-end of Q and produces logical switching signal K1;
(4) logical switching signal K1 controls positive and negative constant flow source discharge loop, carries out electric discharge back to zero, the bipolarity sawtooth signal described in generation to the bi-directional voltage that electric capacity C1 charging obtains;
(5) logical switching signal K1 inputs monostable pulses shaping circuit U4B again, make U4B export Q end and produce latch pulse LATCH signal, pulse duration is determined by the time constant of R12 and C2, and when after the inhibit signal INHIBIT described in U4B input, latch pulse LATCH signal is eliminated;
(6) bipolarity sawtooth signal input hysteresis loop comparator U3C, through diode D1 rectification, producing TTL logic level K2 and the output of DIR signal, for selecting positive and negative constant flow source course of discharge, making the charging voltage of integrating capacitor C1 be discharged back to zero;
(7) the two-way output voltage of electric capacity C1 charging acquisition, inputs by window comparator U2A and the U2B generation logic high of+1.6V and-1.6V as two comparison threshold, produces the logical switching signal K3 of anti-voltage controlled oscillator failure of oscillation through XOR gate U5;
(8) electric discharge back to zero is carried out through the two ends charging voltage of resistance R2 to integrating capacitor C1 in logical switching signal K3 controlled discharge loop, occurs to prevent voltage controlled oscillator failure of oscillation state.
As shown from the above technical solution, the present invention can receive the input of bipolarity direct voltage, produce Transistor-Transistor Logic level positive logic count pulse BUSY signal and the output of latch pulse LATCH signal, and pulse frequency is directly proportional to input voltage absolute amplitude; Meanwhile, according to the polarity of bipolarity sawtooth signal, produce logic level DIR signal and export, achieve the technical requirement that needed for Continuous Tracking type R/D transducer, bipolarity voltage controlled oscillator should possess.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present invention;
Fig. 2 is circuit theory diagrams of the present invention;
Fig. 3 is each element circuit I/O a, b, c, d, e, f point waveform schematic diagram in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described:
As shown in Figure 1, the present embodiment for the bipolarity voltage controlled oscillator in R/D transducer, comprise integrator circuit 1, double threshold comparison circuit 2, first monostable pulses shaping circuit 3, discharge loop control circuit 4, second monostable pulses shaping circuit 5, polarity detection circuit 6, bidirectional constant source circuit 7 and anti-fault protection circuit 8, the input of integrator circuit 1 is connected with voltage source, its output respectively with anti-fault protection circuit 8, double threshold comparison circuit 2 is connected with polarity detection circuit 6, the output of anti-fault protection circuit 8 is connected with the discharge switch control end of integrator circuit 1, the output of double threshold comparison circuit 2 is connected through the input of the first monostable pulses shaping circuit 3 with the second monostable pulses shaping circuit 5, the output of polarity detection circuit 6 is connected with the selector switch control end of bidirectional constant source circuit 7, the output of bidirectional constant source circuit 7 is connected through the reverse input end of discharge loop control circuit 4 with integrator circuit 1, the output of the first monostable pulses shaping circuit 3 is connected with the switch control terminal of discharge loop control circuit 4.
Integrator circuit 1, inputs for accepting described bipolarity direct voltage Ui, and the resistance through series connection carries out two-way charging output to described integrating capacitor; Double threshold comparison circuit 2, for accepting the charging voltage signal of 1 output, the negative saltus step pulse falling edge described in generation; Monostable pulses shaping circuit 3, for accepting the negative saltus step pulse falling edge signal of 2 outputs, the count pulse BUSY signal described in generation exports and logical switching signal K1; Discharge loop control circuit 4, for accepting the signal K1 of 3 outputs, circuit between connecting 1 and 7; Monostable pulses shaping circuit 5, for accepting the signal K1 of 3 outputs, produce latch pulse LATCH signal and export, after input inhibit signal INHIBIT, latch pulse LATCH signal is eliminated; Polarity detection circuit 6, for accepting the charging voltage signal of 1 output, through hysteresis loop comparator, produces TTL logic level K2 and the output of DIR signal; Bidirectional constant source circuit 7, for accepting the K2 signal of 6 outputs, selecting positive and negative constant flow source course of discharge, making the charging voltage of integrating capacitor C1 be discharged back to zero; Anti-fault protection circuit 8, for accepting the charging level signal of 1 output, through window comparator output logic high level, then produce logical switching signal K3 through 74HC86 XOR gate, the discharge circuit controlling 1 carries out short circuit dischange back to zero to integrating capacitor two ends.
As shown in Figure 2, integrator circuit 1 comprises integrated transporting discharging U0A, single-pole double-throw switch (SPDT) K3, resistance R2 and electric capacity C1, the in-phase input end ground connection of integrated transporting discharging U0A, its reverse input end is connected with voltage source through resistance R1, its output is connected with the moved end of single-pole double-throw switch (SPDT) K3 through resistance R2, the not moved end of single-pole double-throw switch (SPDT) K3 respectively with the reverse input end of integrated transporting discharging U0A, the output of integrated transporting discharging U0A is connected with the input of anti-fault protection circuit 8, one end of electric capacity C1 is connected with the reverse input end of integrated transporting discharging U0A, its other end is connected with the output of integrated transporting discharging U0A.This integrator circuit 1 accepts bipolarity direct voltage Ui input as a waveform of Fig. 3, through the resistance R1 of series connection, the integrating capacitor C1 of described active integrator LM148 is charged, when Ui voltage is positive polarity, integrator circuit exports as negative voltage, when Ui voltage is negative polarity, integrator circuit exports as positive voltage, as the b waveform of accompanying drawing 3.
Double threshold comparison circuit 2 comprises comparator U1A and comparator U1B, the input in the same way of comparator U1A is connected with input voltage source respectively with the reverse input end of comparator U1B, the reverse input end of comparator U1A is all connected with the output of integrator circuit 1 with the in-phase input end of comparator U1B, the output of comparator U1B is connected with the input of the output of comparator U1A and the first monostable pulses shaping circuit 3, and the output of comparator U1A is connected with power supply VCC through resistance R4.This double threshold comparison circuit 2, accepts the b voltage that integrator circuit 1 exports, and input by LM319 window comparator U1A or U1B of+1.1V and-1.1V as described two comparison thresholds, the negative saltus step pulse falling edge described in generation, as the c waveform of Fig. 3.
First monostable pulses shaping circuit 3 adopts monostable flipflop U4A, second monostable pulses shaping circuit 5 adopts monostable flipflop U4B, the input trailing edge of monostable flipflop U4A is connected with the output of comparator U1B, its input rising edge is connected with the output of monostable flipflop U4B, the input trailing edge ground connection of monostable flipflop U4B, its input rising edge is connected with the output of monostable flipflop U4A.This monostable pulses shaping circuit 3, accept the c voltage that double threshold comparison circuit 2 exports, input 74HC123 integral form monostable pulses shaping circuit U4A, make U4A export Q and hold the count pulse BUSY signal described in producing, as the d waveform of Fig. 2, its pulse duration is determined by the time constant of R13 and C3, and U4A exports the non-end of Q and produces logical switching signal K1, for controlling described discharge loop control circuit 4.Monostable pulses shaping circuit 5, accept the K1 signal that monostable pulses shaping circuit 3 exports, input monostable pulses shaping circuit U4B, make U4B export Q and hold the latch pulse LATCH signal described in producing, as the e waveform of Fig. 3, its pulse duration is determined by the time constant of R12 and C2, and when after the inhibit signal INHIBIT described in U4B input, latch pulse LATCH signal is eliminated.
Polarity detection circuit 6 comprises comparator U3C, resistance R5, R6, R7, R8, R9, R10, diode D1, the in-phase input end of comparator U3C is through resistance R7 ground connection, its reverse input end is connected with the output of integrator U0A after R6 parallel connection through resistance R5, its output is connected with the anode of diode D1 through resistance R9, and the negative electrode of diode D1 is through resistance R10 ground connection, and the negative electrode of diode D1 is signal output part.This polarity detection circuit 6, accept the b voltage that integrator circuit 1 exports, input LM319 hysteresis loop comparator U3C, through 1N4148 diode D1 rectification, TTL logic level K2 described in generation and DIR signal export, as the f waveform of Fig. 3, for controlling described bidirectional constant source circuit 7, select positive and negative constant flow source course of discharge, make the charging voltage of integrating capacitor C1 be discharged back to zero.
Discharge loop control circuit 4 adopts single-pole double-throw switch (SPDT) K1, bidirectional constant source circuit 7 comprises single-pole double-throw switch (SPDT) K2, resistance R2 and R3, the control end of single-pole double-throw switch (SPDT) K1 is connected with the output of the first monostable pulses shaping circuit 3, not moved end be connected with the reverse input end of integrator circuit 1, the moved end of single-pole double-throw switch (SPDT) K2 is connected with the moved end of single-pole double-throw switch (SPDT) K1, it is not connected with input voltage source through resistance R3, R4 moved end respectively, and the control end of single-pole double-throw switch (SPDT) K2 is connected with the output of polarity detection circuit 6.
Anti-fault protection circuit 8 comprises comparator U2A, U2B and XOR gate U5; the in-phase input end of comparator U2A is connected with input voltage source respectively with the reverse input end of comparator U2B; the reverse input end of comparator U2A is all connected with the output of integrator circuit 1 with the in-phase input end of comparator U2B; the output of comparator U2A with U2B is connected with the input of XOR gate U5, and the output of XOR gate U5 is connected with the control end of single-pole double-throw switch (SPDT) K3 in integrator circuit.
For a control method for the bipolarity voltage controlled oscillator in R/D transducer, comprise the following steps:
S1: bipolarity direct voltage Ui inputs, and through the resistance R1 of series connection, carries out two-way charging, export the voltage contrary with Ui polarity of voltage to the integrating capacitor C1 of described active integrator U0A;
The two-way output voltage that S2: electric capacity C1 charging obtains, input by window comparator U1A or U1B of+1.1V and-1.1V as two comparison threshold, this window comparator produces by the negative saltus step pulse falling edge of logical one to logical zero;
S3: described negative saltus step pulse falling edge, input integral type monostable pulses shaping circuit U4A, make U4A export Q end and produce count pulse BUSY signal, pulse duration is determined by the time constant of R13 and C3, and U4A exports the non-end of Q and produces logical switching signal K1;
S4: logical switching signal K1 controls positive and negative constant flow source discharge loop, carries out electric discharge back to zero, the bipolarity sawtooth signal described in generation to the bi-directional voltage that electric capacity C1 charging obtains;
S5: logical switching signal K1 inputs monostable pulses shaping circuit U4B again, make U4B export Q end and produce latch pulse LATCH signal, pulse duration is determined by the time constant of R12 and C2, and when after the inhibit signal INHIBIT described in U4B input, latch pulse LATCH signal is eliminated;
S6: bipolarity sawtooth signal input hysteresis loop comparator U3C, through diode D1 rectification, producing TTL logic level K2 and the output of DIR signal, for selecting positive and negative constant flow source course of discharge, making the charging voltage of integrating capacitor C1 be discharged back to zero;
The two-way output voltage that S7: electric capacity C1 charging obtains, inputs by window comparator U2A or the U2B generation logic high of+1.6V and-1.6V as two comparison threshold, produces the logical switching signal K3 of anti-voltage controlled oscillator failure of oscillation through XOR gate U5;
S8: electric discharge back to zero is carried out through the two ends charging voltage of resistance R2 to integrating capacitor C1 in logical switching signal K3 controlled discharge loop, occurs to prevent voltage controlled oscillator failure of oscillation state.
Bipolarity voltage controlled oscillator of the present invention, the input of bipolarity direct voltage can be accepted, produce count pulse BUSY signal and the latch pulse LATCH signal of Transistor-Transistor Logic level, simultaneously according to the polarity of input voltage, produce the TTL logic level DIR signal controlling plus/minus counting direction, and the inhibit signal INHIBIT of outside input can be received, forbid the generation of LATCH pulse, and don't affect the normal output of BUSY pulse, reach the particular/special requirement of R/D converter inside analog to digital tracking loop circuit.The present invention in different technologies parameter R/D converter inside independent design, can complete input bipolarity direct voltage, exports count pulse BUSY signal and latch pulse LATCH signal, and produce the functional requirement of the DIR signal controlling plus/minus counting direction.
Above-described embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection range that claims of the present invention determines.
Claims (8)
1. for the bipolarity voltage controlled oscillator in R/D transducer, it is characterized in that: comprise integrator circuit (1), double threshold comparison circuit (2), the first monostable pulses shaping circuit (3), discharge loop control circuit (4), the second monostable pulses shaping circuit (5), polarity detection circuit (6), bidirectional constant source circuit (7) and anti-fault protection circuit (8), the input of described integrator circuit (1) is connected with voltage source, its output respectively with anti-fault protection circuit (8), double threshold comparison circuit (2) is connected with polarity detection circuit (6), the output of described anti-fault protection circuit (8) is connected with the input of integrating circuit (1), the output of described double threshold comparison circuit (2) is connected through the input of the first monostable pulses shaping circuit (3) with the second monostable pulses shaping circuit (5), the output of described polarity detection circuit (6) is connected with the input of bidirectional constant source circuit (7), the output of bidirectional constant source circuit (7) is connected through the input of discharge loop control circuit (4) with integrating circuit (1), the output of described first monostable pulses shaping circuit (3) is connected with the input of discharge loop control circuit (4).
2. according to claim 1 for the bipolarity voltage controlled oscillator in R/D transducer, it is characterized in that: described integrator circuit (1) comprises integrated transporting discharging U0A, single-pole double-throw switch (SPDT) K3, resistance R2 and electric capacity C1, the in-phase input end ground connection of described integrated transporting discharging U0A, its reverse input end is connected with external voltage source through resistance R1, its output is connected with the moved end of single-pole double-throw switch (SPDT) K3 through resistance R2, the not moved end of single-pole double-throw switch (SPDT) K3 is connected with the reverse input end of integrated transporting discharging U0A, the output of integrated transporting discharging U0A is connected with the input of anti-fault protection circuit (8), one end of described electric capacity C1 is connected with the reverse input end of integrated transporting discharging U0A, its other end is connected with the output of integrated transporting discharging U0A.
3. according to claim 1 for the bipolarity voltage controlled oscillator in R/D transducer, it is characterized in that: described double threshold comparison circuit (2) comprises comparator U1A and comparator U1B, the input in the same way of described comparator U1A is connected with input voltage source respectively with the reverse input end of comparator U1B, the reverse input end of comparator U1A is all connected with the output of integrator circuit (1) with the in-phase input end of comparator U1B, the output of comparator U1B is connected with the input of the output of comparator U1A and the first monostable pulses shaping circuit (3), the output of comparator U1A is connected with power supply VCC through resistance R4.
4. according to claim 1 for the bipolarity voltage controlled oscillator in R/D transducer, it is characterized in that: described first monostable pulses shaping circuit (3) adopts monostable flipflop U4A, described second monostable pulses shaping circuit (5) adopts monostable flipflop U4B, the input trailing edge of described monostable flipflop U4A is connected with the output of double threshold comparison circuit (2), its input rising edge is connected with the output of monostable flipflop U4B, the input trailing edge ground connection of monostable flipflop U4B, its input rising edge is connected with the output of monostable flipflop U4A.
5. according to claim 1 for the bipolarity voltage controlled oscillator in R/D transducer, it is characterized in that: described polarity detection circuit (6) comprises comparator U3C, resistance R5, R6, R7, R8, R9, R10, diode D1, the in-phase input end of described comparator U3C is through resistance R7 ground connection, its reverse input end is connected with the output of integrator circuit (1) after R6 parallel connection through resistance R5, its output is connected with the anode of diode D1 through resistance R9, the negative electrode of diode D1 is through resistance R10 ground connection, and the negative electrode of described diode D1 is signal output part.
6. according to claim 1 for the bipolarity voltage controlled oscillator in R/D transducer, it is characterized in that: described discharge loop control circuit (4) adopts single-pole double-throw switch (SPDT) K1, described bidirectional constant source circuit (7) comprises single-pole double-throw switch (SPDT) K2, resistance R2 and R3, the control end of described single-pole double-throw switch (SPDT) K1 is connected with the output of the first monostable pulses shaping circuit (3), it is not connected with the reverse input end of integrator circuit (1) moved end, the moved end of described single-pole double-throw switch (SPDT) K2 is connected with the moved end of single-pole double-throw switch (SPDT) K1, its not moved end respectively through resistance R3, R4 is connected with input voltage source, the control end of described single-pole double-throw switch (SPDT) K2 is connected with the output of polarity detection circuit (6).
7. according to claim 1 for the bipolarity voltage controlled oscillator in R/D transducer, it is characterized in that: described anti-fault protection circuit (8) comprises comparator U2A, U2B and XOR gate U5, the in-phase input end of described comparator U2A is connected with input voltage source respectively with the reverse input end of comparator U2B, the reverse input end of comparator U2A is all connected with the output of integrator circuit (1) with the in-phase input end of comparator U2B, the described output of comparator U2A with U2B is connected with the input of XOR gate U5, the output of XOR gate U5 is connected with the control end of single-pole double-throw switch (SPDT) K3 in integrator circuit (1).
8., for a control method for the bipolarity voltage controlled oscillator in R/D transducer, it is characterized in that, comprise the following steps:
(1) bipolarity direct voltage Ui inputs, and through the resistance R1 of series connection, carries out two-way charging, export the voltage contrary with Ui polarity of voltage to the integrating capacitor C1 of described active integrator U0A;
(2) the two-way output voltage of electric capacity C1 charging acquisition, input by window comparator U1A and U1B of+1.1V and-1.1V as two comparison threshold, this window comparator produces by the negative saltus step pulse falling edge of logical one to logical zero;
(3) the negative saltus step pulse falling edge described in, input integral type monostable pulses shaping circuit U4A, make U4A export Q end and produce count pulse BUSY signal, pulse duration is determined by the time constant of R13 and C3, and U4A exports the non-end of Q and produces logical switching signal K1;
(4) logical switching signal K1 controls positive and negative constant flow source discharge loop, carries out electric discharge back to zero, the bipolarity sawtooth signal described in generation to the bi-directional voltage that electric capacity C1 charging obtains;
(5) logical switching signal K1 inputs monostable pulses shaping circuit U4B again, make U4B export Q end and produce latch pulse LATCH signal, pulse duration is determined by the time constant of R12 and C2, and when after the inhibit signal INHIBIT described in U4B input, latch pulse LATCH signal is eliminated;
(6) bipolarity sawtooth signal input hysteresis loop comparator U3C, through diode D1 rectification, producing TTL logic level K2 and the output of DIR signal, for selecting positive and negative constant flow source course of discharge, making the charging voltage of integrating capacitor C1 be discharged back to zero;
(7) the two-way output voltage of electric capacity C1 charging acquisition, inputs by window comparator U2A and the U2B generation logic high of+1.6V and-1.6V as two comparison threshold, produces the logical switching signal K3 of anti-voltage controlled oscillator failure of oscillation through XOR gate U5;
(8) electric discharge back to zero is carried out through the two ends charging voltage of resistance R2 to integrating capacitor C1 in logical switching signal K3 controlled discharge loop, occurs to prevent voltage controlled oscillator failure of oscillation state.
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| CN112615619A (en) * | 2020-12-22 | 2021-04-06 | 苏州邈航科技有限公司 | Three-threshold IF conversion circuit |
| CN114217122A (en) * | 2021-11-23 | 2022-03-22 | 黑龙江省原子能研究院 | Capacitance integral weak current measuring I/F conversion circuit |
| WO2024045291A1 (en) * | 2022-09-01 | 2024-03-07 | 圣邦微电子（北京）股份有限公司 | One-shot circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101226066B (en) * | 2008-01-25 | 2010-06-02 | 连云港杰瑞电子有限公司 | Multiple-loop absolute type rotary encoder based on rotating transformer |
| CN202083398U (en) * | 2011-04-22 | 2011-12-21 | 长丰集团有限责任公司 | Signal conditioning circuit of rotating transformer |
| CN103560743B (en) * | 2013-10-23 | 2016-04-20 | 国家电网公司 | Application of Motor Speed Detecting method and apparatus |
| CN104954022A (en) * | 2015-07-17 | 2015-09-30 | 深圳市芯联电子科技有限公司 | Digital converter of rotary transformer and integrating circuit of digital converter |
| CN205249186U (en) * | 2015-11-30 | 2016-05-18 | 中国电子科技集团公司第四十三研究所 | A bipolarity voltage controlled oscillator for in RD converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112615619A (en) * | 2020-12-22 | 2021-04-06 | 苏州邈航科技有限公司 | Three-threshold IF conversion circuit |
| CN112615619B (en) * | 2020-12-22 | 2023-09-22 | 苏州邈航科技有限公司 | Three-threshold IF conversion circuit |
| CN114217122A (en) * | 2021-11-23 | 2022-03-22 | 黑龙江省原子能研究院 | Capacitance integral weak current measuring I/F conversion circuit |
| WO2024045291A1 (en) * | 2022-09-01 | 2024-03-07 | 圣邦微电子（北京）股份有限公司 | One-shot circuit |
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| CN105281771B (en) | 2018-10-23 |
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