CN111351504A - Current frequency conversion device and system with programmable scale factors - Google Patents
Current frequency conversion device and system with programmable scale factors Download PDFInfo
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- CN111351504A CN111351504A CN201811569778.9A CN201811569778A CN111351504A CN 111351504 A CN111351504 A CN 111351504A CN 201811569778 A CN201811569778 A CN 201811569778A CN 111351504 A CN111351504 A CN 111351504A
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Abstract
The invention provides a scale factor programmable current frequency conversion device and a system, wherein the device comprises: the circuit comprises an integrating circuit, a threshold detection circuit, a constant current source circuit and a controller; the integrating circuit is connected with the output end of the accelerometer and used for receiving the output current of the accelerometer, carrying out integration operation on the output current and the feedback current, outputting integration voltage and sending the integration voltage to the threshold detection circuit; the threshold detection circuit is used for comparing the integral voltage with a standard voltage threshold value, generating an indication signal and sending the indication signal to the controller; the constant current source circuit is used for outputting feedback current to the integrating circuit and carrying out charge balance on the output current; the controller is used for controlling the constant current source circuit to output feedback current according to the indication signal and controlling the feedback duration of the feedback current so as to adjust the scale factor of the current frequency conversion device; the device can adjust each current frequency conversion device respectively, so that the scale factors are uniform.
Description
Technical Field
The invention relates to a current frequency conversion device with programmable scale factor and a system thereof.
Background
An accelerometer is one of important components in an inertial navigation system, and in order to detect the operation attitude of the system in real time, the output (current output) of the accelerometer needs to be acquired in real time to judge the operation state. The current/frequency conversion circuit is used together with the accelerometer to convert the output current value of the accelerometer into a digital pulse signal proportional to the output current value, so that the navigation computer can conveniently measure and calculate the output of the accelerometer.
The scaling factor of the current/frequency conversion circuit is denoted KSign boardThe number of digital pulse signals output from the current/frequency conversion circuit in 1s is defined as the number of digital pulse signals in the case where the input current is 1 mA.
In the production process of the current/frequency conversion circuit, due to the difference between electronic components, the scale factor of each current/frequency conversion circuit is different, so that even the inertial navigation system in the same batch needs to be calibrated independently to adapt to the difference of the scale factor of each current/frequency conversion circuit. And because the difference of the scale factor of each current/frequency conversion circuit does not have interchangeability, if a new current frequency conversion circuit is replaced, the whole navigation algorithm needs to be modified, and great inconvenience is brought to the maintenance and the repair of the inertial navigation system.
Disclosure of Invention
The invention aims to provide a current-frequency conversion device with programmable scale factors and a system thereof, aiming at the problem that the inertial navigation system is inconvenient to maintain and repair due to the scale factor difference of a current/frequency conversion circuit in the prior art, so that the convenience of the maintenance and repair of the inertial navigation system can be effectively improved.
A scale factor programmable current frequency conversion device comprises an integrating circuit, a threshold detection circuit, a constant current source circuit and a controller;
the integrating circuit is connected with the output end of the accelerometer and used for receiving the output current of the accelerometer, performing integration operation on the output current and the feedback current, outputting integration voltage and sending the integration voltage to the threshold detection circuit;
the threshold detection circuit is used for comparing the integral voltage with a standard voltage threshold value, generating an indication signal and sending the indication signal to the controller;
the constant current source circuit is used for outputting feedback current to the integrating circuit and carrying out charge balance on the output current;
and the controller is used for controlling the constant current source circuit to output feedback current according to the indication signal and controlling the feedback duration of the feedback current so as to adjust the scale factor of the current frequency conversion device.
Further, the integration circuit comprises a first capacitor, a second capacitor, a first resistor, a second resistor and a first operational amplifier;
the first operational amplifier comprises a first positive input end, a first negative input end and a first output end;
one end of the first resistor is used for being connected with the output end of the accelerometer and receiving the output current of the accelerometer, and the other end of the first resistor is connected with the first negative electrode input end;
one end of the first capacitor is grounded, and the other end of the first capacitor is connected with the first negative electrode input end;
one end of the second resistor is connected with the first output end, and the other end of the second resistor is used for outputting an integral voltage;
one end of the second capacitor is connected with the first negative electrode input end, and the other end of the second capacitor is connected with the other end of the second resistor;
the feedback current is input through the first negative input end, and the first positive input end is grounded.
Further, the first operational amplifier is an AD8638 chip.
Further, the threshold detection circuit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and an LM119 chip;
the LM119 chip comprises a first positive input interface, a first negative input interface, a second positive input interface, a second negative input interface, a first output interface and a second output interface;
one end of the third resistor is connected with a +15V power supply, and the other end of the third resistor is connected with the first positive input interface; one end of the fourth resistor is connected with the first positive input interface, and the other end of the fourth resistor is grounded;
one end of the fifth resistor is connected with the second cathode input interface, and the other end of the fifth resistor is grounded; one end of the sixth resistor is connected with the second cathode input interface, and the other end of the sixth resistor is connected with a-15V power supply;
the integral voltage comprises a positive integral voltage and a negative integral voltage, the positive integral voltage is input through the first negative pole input interface, and the negative integral voltage is input through the second positive pole input interface;
one end of the seventh resistor is connected with the first output interface, and the other end of the seventh resistor is connected with a +5V power supply;
one end of the eighth resistor is connected with the second output interface, and the other end of the eighth resistor is connected with a +5V power supply;
the first output interface is used for outputting a positive threshold indication signal, and the second output interface is used for outputting a negative threshold indication signal.
Further, the standard voltage threshold includes a positive standard voltage threshold and a negative standard voltage threshold, and the positive standard voltage threshold is obtained by dividing the voltage of the third resistor and the fourth resistor;
the negative standard voltage threshold is obtained by dividing the voltage of the fifth resistor and the sixth resistor;
the threshold detection circuit is further configured to control the first output interface and the second output interface to both output a high level signal when the integrated voltage is greater than the negative standard voltage threshold; when the integral voltage is larger than the positive standard voltage threshold value, enabling the first output interface to output a low level signal, and enabling the second output interface to output a high level signal; and when the integrated voltage is smaller than the negative standard voltage threshold value, the first output interface outputs a high level, and the second output interface outputs a low level.
Further, when the first output interface or the second output interface outputs a low level, the controller controls the constant current source circuit to output a feedback current, and simultaneously the controller outputs a pulse signal.
Further, the feedback time length of the feedback current output by the constant current source is inversely proportional to the number of pulse signals output by the controller.
Further, the constant current source circuit comprises a second operational amplifier, a third operational amplifier, a HI1-201HS chip, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a first zener diode, a second zener diode, a third zener diode and a fourth zener diode;
the HI1-201HS chip comprises a first input interface, a second input interface, a third input interface, a fourth input interface, a third output interface, a fourth output interface, a fifth output interface and a sixth output interface;
the second operational amplifier comprises a second positive input end, a second negative input end and a second output end; the third operational amplifier comprises a third positive input end, a third negative input end and a third output end;
the negative electrode of the first voltage-stabilizing diode is connected with a +15V power supply, the positive electrode of the first voltage-stabilizing diode is connected with the positive electrode of the second voltage-stabilizing diode, the negative electrode of the second voltage-stabilizing diode is connected with one end of the tenth resistor, the other end of the tenth resistor is grounded, one end of the ninth resistor is connected between the +15V power supply and the first voltage-stabilizing diode, and the other end of the ninth resistor is connected with the input end of the second negative electrode; the second positive input end is connected between the tenth resistor and the second voltage-stabilizing diode;
the negative electrode of the third voltage-stabilizing diode is connected with a-15V power supply, the positive electrode of the third voltage-stabilizing diode is connected with the positive electrode of the fourth voltage-stabilizing diode, the negative electrode of the fourth voltage-stabilizing diode is connected with one end of a twelfth resistor, the other end of the twelfth resistor is grounded, one end of an eleventh resistor is connected between the-15V power supply and the third voltage-stabilizing diode, and the other end of the eleventh resistor is connected with the input end of the third negative electrode; the third positive input end is connected between the twelfth resistor and the fourth zener diode;
the second negative electrode input end is also connected with the second output end, and the third negative electrode input end is also connected with the third output end;
the second output end is connected with the first input interface and the second input interface, and the third output end is connected with the third input interface and the fourth input interface; the fourth output interface and the fifth output interface are used for outputting feedback current, the third output interface is grounded, and the sixth output interface is grounded;
the HI1-201HS chip further comprises a first control signal interface, a second control signal interface, a third control signal interface and a fourth control signal interface, wherein the first control signal interface, the second control signal interface, the third control signal interface and the fourth control signal interface are all connected with the controller.
Further, the second operational amplifier and the third operational amplifier are both OP27 chips.
The scale factor programmable current frequency conversion system comprises the scale factor programmable current frequency conversion device, an accelerometer and an upper computer, wherein the accelerometer is connected with an integrating circuit, and the upper computer is connected with a controller.
The programmable scale factor current frequency conversion device and the programmable scale factor current frequency conversion system can respectively adjust each current frequency conversion device, so that the scale factors are unified, the failed current frequency conversion device can be replaced, a navigation system algorithm does not need to be changed to adapt to a new current frequency conversion device, and the convenience of maintenance and repair of an inertial navigation system is effectively improved.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a scale factor programmable current-to-frequency conversion apparatus provided in the present invention.
FIG. 2 is a schematic structural diagram of an embodiment of an integrating circuit in the scaling factor programmable current-to-frequency conversion apparatus provided by the present invention.
FIG. 3 is a schematic structural diagram of a threshold detection circuit in the scaling factor programmable current-to-frequency conversion apparatus according to an embodiment of the present invention.
FIG. 4 is a schematic structural diagram of an embodiment of a constant current source circuit in the scaling factor programmable current frequency conversion device provided by the present invention.
FIG. 5 is a control timing diagram of the scaling factor programmable current to frequency conversion device provided by the present invention.
FIG. 6 is a schematic diagram of a test of a scale factor programmable current to frequency conversion device provided by the present invention.
FIG. 7 is a block diagram of an embodiment of a scale factor programmable current to frequency conversion system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
Referring to fig. 1, the present embodiment provides a scale factor programmable current frequency conversion apparatus, including an integrating circuit 101, a threshold detecting circuit 102, a constant current source circuit 103, and a controller 104;
the integrating circuit 101 is connected with the output end of the accelerometer and is used for receiving the output current of the accelerometer, performing integration operation on the output current and the feedback current, outputting integration voltage and sending the integration voltage to the threshold detection circuit 102;
the threshold detection circuit 102 is configured to compare the integrated voltage with a standard voltage threshold, generate an indication signal, and send the indication signal to the controller 103;
a constant current source circuit 103 for outputting a feedback current to the integrating circuit 101 and performing charge balance on the output current;
and the controller 104 is used for controlling the constant current source circuit 103 to output feedback current according to the indication signal and controlling the feedback duration of the feedback current so as to adjust the scale factor of the current frequency conversion device.
Further, referring to fig. 2, the integrating circuit 101 includes a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor R2, and a first operational amplifier U1;
the first operational amplifier U1 includes a first positive input terminal, a first negative input terminal, and a first output terminal;
one end of the first resistor R1 is used for being connected with the output end of the accelerometer and receiving the output current of the accelerometer, and the other end of the first resistor R1 is connected with the first negative input end;
one end of the first capacitor C1 is grounded, and the other end is connected with the first negative electrode input end;
one end of the second resistor R2 is connected with the first output end, and the other end is used for outputting an integral voltage;
one end of the second capacitor C2 is connected with the first negative input end, and the other end of the second capacitor C2 is connected with the other end of the second resistor R2;
the feedback current is input through a first negative input end, and the first positive input end is grounded.
In addition, the first operational amplifier U1 is also connected to a +15V power supply and a-15V power supply.
In a preferred embodiment, the first operational amplifier U1 is an AD8638 chip.
Specifically, the output current of the accelerometer passes through the integrating circuit 101 to generate an integrating voltage, the positive current generates a negative integrating voltage, the negative current generates a positive integrating voltage, and if no feedback current is applied, the integrating voltage reaches ± 15V.
Further, referring to fig. 3, the threshold detection circuit 102 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and an LM119 chip;
the LM119 chip comprises a first positive input interface IN1+, a first negative input interface IN1-, a second positive input interface IN2+, a second negative input interface IN2-, a first output interface OUT1 and a second output interface OUT 2;
one end of the third resistor R3 is connected with a +15V power supply, and the other end of the third resistor R3 is connected with the first positive input interface IN1 +; one end of the fourth resistor R4 is connected with the first positive input interface IN1+, and the other end is grounded;
one end of the fifth resistor R5 is connected with the second negative input interface IN2-, and the other end is grounded; one end of the sixth resistor R6 is connected with the second negative input interface IN2-, and the other end is connected with a-15V power supply;
the integrated voltage comprises a positive integrated voltage and a negative integrated voltage, the positive integrated voltage is input through a first negative input interface IN1-, and the negative integrated voltage is input through a second positive input interface IN2 +;
one end of the seventh resistor R7 is connected with the first output interface OUT1, and the other end of the seventh resistor R7 is connected with a +5V power supply;
one end of the eighth resistor R8 is connected with the second output interface OUT2, and the other end of the eighth resistor R8 is connected with a +5V power supply;
the first output interface OUT1 is for outputting a positive threshold indication signal and the second output interface OUT2 is for outputting a negative threshold indication signal.
Further, the standard voltage threshold comprises a positive standard voltage threshold and a negative standard voltage threshold, and the positive standard voltage threshold is obtained by dividing voltage through a third resistor R3 and a fourth resistor R4;
the negative standard voltage threshold is obtained by voltage division of the fifth resistor R5 and the sixth resistor R6.
In a preferred embodiment, the positive standard voltage threshold is +1.5V and the negative standard voltage threshold is-1.5V.
The threshold detection circuit 102 is further configured to control the first output interface OUT1 and the second output interface OUT2 to both output a high level signal when the integrated voltage is greater than the negative standard voltage threshold; when the integrated voltage is larger than the positive standard voltage threshold, the first output interface OUT1 is enabled to output a low-level signal, and the second output interface OUT2 outputs a high-level signal; when the integrated voltage is smaller than the negative standard voltage threshold, the first output interface OUT1 is enabled to output a high level, and the second output interface OUT2 outputs a low level.
Further, when the first output interface OUT1 or the second output interface OUT2 outputs a low level, the controller 104 controls the constant current source circuit 103 to output a feedback current while the controller 104 outputs a pulse signal.
Further, referring to fig. 4, the constant current source circuit 103 includes a second operational amplifier U2, a third operational amplifier U3, a HI1-201HS chip, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a first zener diode D1, a second zener diode D2, a third zener diode D3, and a fourth zener diode D4;
the HI1-201HS chip includes a first input interface IN1, a second input interface IN2, a third input interface IN3, a fourth input interface IN4, a third output interface OUT3, a fourth output interface OUT4, a fifth output interface OUT5, and a sixth output interface OUT 6;
the second operational amplifier U2 includes a second positive input terminal, a second negative input terminal, and a second output terminal; the third operational amplifier U3 includes a third positive input terminal, a third negative input terminal, and a third output terminal;
the negative electrode of the first voltage-stabilizing diode D1 is connected with a +15V power supply, the positive electrode of the first voltage-stabilizing diode D3578 is connected with the positive electrode of the second voltage-stabilizing diode D2, the negative electrode of the second voltage-stabilizing diode D2 is connected with one end of a tenth resistor R10, the other end of the tenth resistor R10 is grounded, one end of a ninth resistor R9 is connected between the +15V power supply and the first voltage-stabilizing diode D1, and the other end of the ninth resistor R9 is connected with the second negative electrode input end; the second positive input end is connected between the tenth resistor R10 and the second zener diode D2;
the negative electrode of the third voltage-stabilizing diode D3 is connected with a-15V power supply, the positive electrode of the third voltage-stabilizing diode D3578 is connected with the positive electrode of the fourth voltage-stabilizing diode D4, the negative electrode of the fourth voltage-stabilizing diode D4 is connected with one end of a twelfth resistor R12, the other end of the twelfth resistor R12 is grounded, one end of an eleventh resistor R11 is connected between the-15V power supply and the third voltage-stabilizing diode D3, and the other end of the eleventh resistor R11 is connected with the third negative electrode input end; the third positive input end is connected between the twelfth resistor R12 and the fourth zener diode D4;
the second negative electrode input end is also connected with the second output end, and the third negative electrode input end is also connected with the third output end;
a second output terminal is connected to the first input interface IN1 and the second input interface IN2, and a third output terminal is connected to the third input interface IN3 and the fourth input interface IN 4; the fourth output interface OUT4 and the fifth output interface OUT5 are used for outputting feedback current, the third output interface IN3 is grounded, and the sixth output interface IN6 is grounded.
Further, the HI1-201HS chip further includes a first control signal interface a1, a second control signal interface a2, a third control signal interface A3, and a fourth control signal interface a4, the first control signal interface a1, the second control signal interface a2, the third control signal interface A3, and the fourth control signal interface a4 are all connected to the controller 104, the first control signal interface a1 is configured to receive a positive constant current source feedback disable control signal, the second control signal interface a2 is configured to receive a positive constant current source feedback enable control signal, the third control signal interface A3 is configured to receive a negative constant current source feedback disable control signal, and the fourth control signal interface a4 is configured to receive a negative constant current source feedback enable control signal.
As a preferred embodiment, the second operational amplifier U2 and the third operational amplifier U3 are both OP27 chips.
The controller 104 can judge whether the output current of the accelerometer is positive or negative according to the output of the threshold detection circuit 102, so as to control the constant current source circuit 103 to output the positive or negative of the feedback current, when the output current of the accelerometer is positive, the negative feedback current is output, and when the output current of the accelerometer is negative, the positive feedback current is output, so as to achieve the charge balance.
Further, referring to fig. 5, it is assumed that the controller 104 controls the constant current source circuit 103 to output a feedback current with a feedback period T and a feedback duration C, when the feedback period T is reached, the controller 104 determines whether to control the constant current source circuit 103 to output the feedback current according to the output of the threshold detection circuit 102, and the controller 104 outputs a pulse signal while the constant current source circuit 103 outputs the feedback current, where the period of the pulse signal output by the controller 104 is the same as the feedback period and the duty ratio is the same.
It can be known from the charge balance principle that if the feedback time length is increased, the feedback charge fed back to the integrating circuit in a single feedback period is increased, so that the number of feedback periods is reduced, the number of output pulses is correspondingly reduced, and the scale factor of the current frequency conversion device is reduced.
With reference to figure 6 of the drawings,during testing, the standard constant current instrument 100 is used for replacing an accelerometer to be connected with the integrating circuit, the standard constant current instrument is used for generating 1mA standard current, and the feedback duration of the constant current source circuit in a single feedback period is CSign boardThe upper computer 200 counts the number of pulses output from the controller, and defines the count value as the scale factor of the current-frequency conversion device within 1 s.
If the current frequency conversion device has a feedback time length of C in a single feedbackSign boardMeasured scale factor KMeasuringAnd K isMeasuringIs not equal to CSign boardAdjusting the feedback duration of the feedback current until KMeasuringIs equal to CSign boardOr K isMeasuringAnd CSign boardThe error of the absolute value difference reaches the minimum, the finally obtained feedback time length is sent to a FLASH inside the controller, and the unification of the scale factors of different current frequency conversion devices is completed.
The programmable current frequency conversion device provided by the embodiment can respectively adjust each current frequency conversion device, so that the scale factors are unified, the failed current frequency conversion device can be replaced, the navigation system algorithm does not need to be changed to adapt to a new current frequency conversion device, and the convenience of maintenance and repair of the inertial navigation system is effectively improved.
Example two
Referring to fig. 7, the present embodiment provides a scale factor programmable current-to-frequency conversion system, which includes a scale factor programmable current-to-frequency conversion apparatus 201 according to the first embodiment, and further includes an accelerometer 202 and an upper computer 203, where the accelerometer 202 is connected to an integrating circuit, and the upper computer 203 is connected to a controller.
The upper computer 203 is used for receiving the pulse signal fed back by the controller.
The programmable current frequency conversion system provided by the embodiment can adjust each current frequency conversion device respectively, so that the scale factors are unified, the failed current frequency conversion device can be replaced, the navigation system algorithm does not need to be changed to adapt to a new current frequency conversion device, and the convenience of maintenance and repair of the inertial navigation system is effectively improved.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. A scale factor programmable current frequency conversion device is characterized by comprising an integrating circuit, a threshold detection circuit, a constant current source circuit and a controller;
the integrating circuit is connected with the output end of the accelerometer and used for receiving the output current of the accelerometer, performing integration operation on the output current and the feedback current, outputting integration voltage and sending the integration voltage to the threshold detection circuit;
the threshold detection circuit is used for comparing the integral voltage with a standard voltage threshold value, generating an indication signal and sending the indication signal to the controller;
the constant current source circuit is used for outputting feedback current to the integrating circuit and carrying out charge balance on the output current;
and the controller is used for controlling the constant current source circuit to output feedback current according to the indication signal and controlling the feedback duration of the feedback current so as to adjust the scale factor of the current frequency conversion device.
2. A scale factor programmable current to frequency conversion device according to claim 1 wherein said integrating circuit comprises a first capacitor, a second capacitor, a first resistor, a second resistor and a first operational amplifier;
the first operational amplifier comprises a first positive input end, a first negative input end and a first output end;
one end of the first resistor is used for being connected with the output end of the accelerometer and receiving the output current of the accelerometer, and the other end of the first resistor is connected with the first negative electrode input end;
one end of the first capacitor is grounded, and the other end of the first capacitor is connected with the first negative electrode input end;
one end of the second resistor is connected with the first output end, and the other end of the second resistor is used for outputting an integral voltage;
one end of the second capacitor is connected with the first negative electrode input end, and the other end of the second capacitor is connected with the other end of the second resistor;
the feedback current is input through the first negative input end, and the first positive input end is grounded.
3. A scale factor programmable current frequency conversion device according to claim 2, wherein said first operational amplifier is an AD8638 chip.
4. A scale factor programmable current frequency conversion device according to claim 3, wherein said threshold detection circuit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a LM119 chip;
the LM119 chip comprises a first positive input interface, a first negative input interface, a second positive input interface, a second negative input interface, a first output interface and a second output interface;
one end of the third resistor is connected with a +15V power supply, and the other end of the third resistor is connected with the first positive input interface; one end of the fourth resistor is connected with the first positive input interface, and the other end of the fourth resistor is grounded;
one end of the fifth resistor is connected with the second cathode input interface, and the other end of the fifth resistor is grounded; one end of the sixth resistor is connected with the second cathode input interface, and the other end of the sixth resistor is connected with a-15V power supply;
the integral voltage comprises a positive integral voltage and a negative integral voltage, the positive integral voltage is input through the first negative pole input interface, and the negative integral voltage is input through the second positive pole input interface;
one end of the seventh resistor is connected with the first output interface, and the other end of the seventh resistor is connected with a +5V power supply;
one end of the eighth resistor is connected with the second output interface, and the other end of the eighth resistor is connected with a +5V power supply;
the first output interface is used for outputting a positive threshold indication signal, and the second output interface is used for outputting a negative threshold indication signal.
5. A scale factor programmable current frequency conversion device according to claim 4, wherein said standard voltage threshold comprises a positive standard voltage threshold and a negative standard voltage threshold, said positive standard voltage threshold is obtained by dividing said third resistance and said fourth resistance;
the negative standard voltage threshold is obtained by dividing the voltage of the fifth resistor and the sixth resistor;
the threshold detection circuit is further configured to control the first output interface and the second output interface to both output a high level signal when the integrated voltage is greater than the negative standard voltage threshold; when the integral voltage is larger than the positive standard voltage threshold value, enabling the first output interface to output a low level signal, and enabling the second output interface to output a high level signal; and when the integrated voltage is smaller than the negative standard voltage threshold value, the first output interface outputs a high level, and the second output interface outputs a low level.
6. A scaler according to claim 5, wherein when said first output interface or said second output interface outputs a low level, said controller controls said constant current source circuit to output a feedback current while said controller outputs a pulse signal.
7. A scalefactor programmable current-to-frequency conversion device according to claim 6 wherein the feedback duration of the feedback current from the constant current source is inversely proportional to the number of pulse signals output by the controller.
8. The scale factor programmable current to frequency conversion device of claim 7, wherein the constant current source circuit comprises a second operational amplifier, a third operational amplifier, a HI1-201HS chip, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a first zener diode, a second zener diode, a third zener diode, and a fourth zener diode;
the HI1-201HS chip comprises a first input interface, a second input interface, a third input interface, a fourth input interface, a third output interface, a fourth output interface, a fifth output interface and a sixth output interface;
the second operational amplifier comprises a second positive input end, a second negative input end and a second output end; the third operational amplifier comprises a third positive input end, a third negative input end and a third output end;
the negative electrode of the first voltage-stabilizing diode is connected with a +15V power supply, the positive electrode of the first voltage-stabilizing diode is connected with the positive electrode of the second voltage-stabilizing diode, the negative electrode of the second voltage-stabilizing diode is connected with one end of the tenth resistor, the other end of the tenth resistor is grounded, one end of the ninth resistor is connected between the +15V power supply and the first voltage-stabilizing diode, and the other end of the ninth resistor is connected with the input end of the second negative electrode; the second positive input end is connected between the tenth resistor and the second voltage-stabilizing diode;
the negative electrode of the third voltage-stabilizing diode is connected with a-15V power supply, the positive electrode of the third voltage-stabilizing diode is connected with the positive electrode of the fourth voltage-stabilizing diode, the negative electrode of the fourth voltage-stabilizing diode is connected with one end of a twelfth resistor, the other end of the twelfth resistor is grounded, one end of an eleventh resistor is connected between the-15V power supply and the third voltage-stabilizing diode, and the other end of the eleventh resistor is connected with the input end of the third negative electrode; the third positive input end is connected between the twelfth resistor and the fourth zener diode;
the second negative electrode input end is also connected with the second output end, and the third negative electrode input end is also connected with the third output end;
the second output end is connected with the first input interface and the second input interface, and the third output end is connected with the third input interface and the fourth input interface; the fourth output interface and the fifth output interface are used for outputting feedback current, the third output interface is grounded, and the sixth output interface is grounded;
the HI1-201HS chip further comprises a first control signal interface, a second control signal interface, a third control signal interface and a fourth control signal interface, wherein the first control signal interface, the second control signal interface, the third control signal interface and the fourth control signal interface are all connected with the controller.
9. A scaleable factor programmable current to frequency conversion device according to claim 8 wherein said second and third operational amplifiers are each OP27 chips.
10. A scale factor programmable current to frequency conversion system comprising a scale factor programmable current to frequency conversion apparatus according to any of claims 1 to 9, further comprising an accelerometer and a host computer, the accelerometer being connected to the integrating circuit and the host computer being connected to the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811569778.9A CN111351504B (en) | 2018-12-21 | 2018-12-21 | Current frequency conversion device and system with programmable scale factors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811569778.9A CN111351504B (en) | 2018-12-21 | 2018-12-21 | Current frequency conversion device and system with programmable scale factors |
Publications (2)
| Publication Number | Publication Date |
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| CN111351504A true CN111351504A (en) | 2020-06-30 |
| CN111351504B CN111351504B (en) | 2023-10-17 |
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| US20030126927A1 (en) * | 1995-05-30 | 2003-07-10 | Toshiyuki Nozoe | Angular velocity sensor |
| CN102944230A (en) * | 2012-11-14 | 2013-02-27 | 浙江大学 | Constant-frequency drive method and constant-frequency drive device of tunable micromechanical gyroscope |
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| CN111351504B (en) | 2023-10-17 |
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