CN209961826U - Converter for high-voltage measurement system - Google Patents
Converter for high-voltage measurement system Download PDFInfo
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- CN209961826U CN209961826U CN201920327327.8U CN201920327327U CN209961826U CN 209961826 U CN209961826 U CN 209961826U CN 201920327327 U CN201920327327 U CN 201920327327U CN 209961826 U CN209961826 U CN 209961826U
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Abstract
The utility model discloses a converter for high voltage measurement system, including installing the V/F converter at sensor high-pressure part, the V/F converter includes attenuator, impedance matcher, amplifier, voltage control oscillator and driver, and the one end and the input signal of attenuator meet, and the other end of attenuator connects on the optical cable with impedance matcher, amplifier, voltage control oscillator and the driver that has emitting diode in proper order. The converter for high voltage measurement system, V/F converter, can convert the measurement signal into the frequency modulation signal which drives the light emitting diode, has good linearity and temperature stability because the light pulse signal is propagated in the form of digital signal, can also be used in other measurement circuits with certain range of working frequency, has good linear working characteristic, and changes the measurement frequency range by changing the values of 54LS628 external capacitor and reference voltage.
Description
Technical Field
The utility model relates to a power transmission technical field specifically is a converter for high voltage measurement system.
Background
In high voltage measurements, only a relatively large bandwidth is usually required, the requirements on measurement accuracy and dynamic characteristics are generally not high, but measurements at high potentials have a requirement on the power supply of the circuit. Although digital systems have high accuracy, good dynamic characteristics and reliability, they are difficult to implement due to the limitations of large bandwidth and power consumption.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a converter for high voltage measurement system has that the linearity is good, the low power dissipation, insensitive and the good advantage of interference killing feature to the temperature, has solved the problem among the prior art.
In order to achieve the above object, the utility model provides a following technical scheme: a converter for a high-voltage measuring system comprises a V/F converter arranged at a high-voltage part of a sensor, wherein the V/F converter comprises an attenuator, an impedance matcher, an amplifier, a voltage control oscillator and a driver, one end of the attenuator is connected with an input signal, and the other end of the attenuator is connected with the impedance matcher, the amplifier, the voltage control oscillator and the driver with a light-emitting diode on an optical cable in sequence.
Preferably, an input of the attenuator is connected with a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and a resistor R7 which are connected with the voltage of 0.7V, the other end of the resistor R1 is connected with a common ground end, the other end of the resistor R2 is connected with a parallel connection port of the resistor R3, the resistor R7, the resistor R7V and the common ground end, a capacitor C1 is connected with a capacitor C3 and a capacitor C5 in series and connected with a parallel connection port of the capacitor C7, the resistor R7 and the common ground end, a capacitor C2 is connected with a capacitor C4 and a capacitor C6 in series and connected with a parallel connection port of the capacitor C8, a resistor R7 and the common ground end, the other end of the resistor R3 is connected with a resistor R4, a resistor R7, a resistor 0.7V and a parallel connection port of the common ground end, and the other end of the resistor R4 is connected with a resistor R5.
Preferably, the impedance transformation and amplification circuit in the impedance matcher and amplifier comprises an LF356 operational amplifier U1 and an LF356 operational amplifier U2, a terminal corner 3 of an LF356 operational amplifier U1 is connected with the other end of a resistor R7, a terminal corner 7 of an LF356 operational amplifier U1 is connected in parallel with + VCC, a series capacitor C9 is connected at terminal corners 4 and-VCC, a terminal corner 6 of an LF356 operational amplifier U1 is connected with a parallel port of the resistor R12, the resistor R13 and the resistor R15, the other end of the resistor R12 is connected with a parallel port of a resistor R14 connected in series with the resistor R13 and a variable resistor R10 connected with the terminal corner 2, a series resistor R10 is connected with a common ground terminal, the other end of the resistor R5739 is connected with a feedback resistor R16 connected in parallel with the terminal corner 2 of the LF356 operational amplifier U2, a terminal corner 7 + VCC of an LF356 operational amplifier U2 is connected in parallel with the resistor R10, a series capacitor C10 is connected with the terminal corner R864, a resistor R8658 and a resistor R8658, the other end of the resistor R19 is connected with the parallel connection port of the resistor R21 connected in series with the resistor R20 and the variable resistor R17 connected with the terminal angle 3, and the variable resistor R17 and the series resistor R18 are connected with the common ground.
Preferably, a pin 11 series resistor R23 of a 54LS628 voltage-controlled oscillator U3 in the voltage-controlled oscillator is connected to a pin 12, a pin 10 of a 54LS628 voltage-controlled oscillator U3 is connected to a super capacitor C11 and is connected with a pin 1 in parallel at a common ground end, a pin 3 series capacitor C12 is connected to a pin 4, a pin 7 series capacitor C13 is connected to a pin 9 connected with + VCC, and a pin 3 is connected to a parallel connection port of a diode D8 and a capacitor C14.
Preferably, the base of the high-speed switching triode V10 in the driver is connected with the positive electrode of the diode D8, the emitter series resistor R27 of the high-speed switching triode V10 is connected with the common ground, the collector of the high-speed switching triode V10 is connected with the diode V9 and the capacitor C15 which are connected in parallel, the series resistor R26 is connected with + VCC, and the capacitor C14 is connected with the parallel connection port of the resistor R24 and the adjustable varistor R25.
Compared with the prior art, the beneficial effects of the utility model are as follows:
the converter for the high-voltage measurement system has the advantages that the V/F converter can convert a measurement signal into a frequency modulation signal for driving the light emitting diode, and an optical pulse signal is transmitted in a digital signal mode, so that the converter has good linearity and temperature stability, simultaneously has strong anti-electromagnetic interference capability and environmental temperature interference capability, can be used in other measurement circuits with working frequency within a certain range, has good linear working characteristics, low power consumption, insensitivity to temperature and good anti-interference performance, and changes the measurement frequency range by changing the values of 54LS628 external capacitor and reference voltage.
Drawings
FIG. 1 is a block diagram of a V/F converter according to the present invention;
fig. 2 is a schematic diagram of the V/F converter circuit of the present invention.
In the figure: 1. a V/F converter; 11. an attenuator; 12. an impedance matcher; 13. an amplifier; 14. a voltage controlled oscillator; 15. a driver.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, a converter for a high voltage measurement system includes a V/F converter 1 installed at a high voltage portion of a sensor, the V/F converter 1 includes an attenuator 11, an impedance matcher 12, an amplifier 13, a voltage controlled oscillator 14, and a driver 15, one end of the attenuator 11 is connected to an input signal, and the other end of the attenuator 11 is connected to an optical cable in turn with the impedance matcher 12, the amplifier 13, the voltage controlled oscillator 14, and the driver 15 with a light emitting diode.
The circuit of the V/F converter 1 is powered by a single direct current stabilized power supply at a high potential, the power supply generally consists of a rechargeable nickel-cadmium storage battery, the circuit can work for twenty hours at one time, a power transformer can also be adopted to carry out direct current power supply by inducing energy on a high-voltage bus, the V/F circuit and the power supply are respectively arranged in a shielding box, and measures such as grounding, decoupling, isolation and the like are simultaneously adopted to effectively resist electromagnetic interference.
Referring to fig. 2, an input terminal of the attenuator 11 is connected to the resistor R1, the resistor R2, the capacitor C1, the capacitor C2 and the resistor R7, which are connected to the voltage of 0.7V, the other terminal of the resistor R1 is connected to the common ground, the other terminal of the resistor R2 is connected to the parallel port of the resistor R3, the resistor R7, the capacitor R7V and the common ground, the capacitor C1 is connected in series with the capacitor C3 and the capacitor C5 to the parallel port of the capacitor C7, the resistor R7 and the common ground, the capacitor C2 is connected in series with the capacitor C4 and the capacitor C6 to the parallel port of the capacitor C8, the resistor R7 and the common ground, the other terminal of the resistor R3 is connected to the parallel port of the resistor R4, the resistor R7, the capacitor R7V and the common ground, and the other terminal of the resistor R4 is connected to the parallel port of the resistor R5, the resistor R6.
The input voltage signal is firstly transmitted to the attenuator 11, which has the function of limiting the range of the input voltage and increasing the input impedance, the attenuator 11 adopts the form of series connection of a resistor and a capacitor, the measuring range is changed by changing the element value, in order to meet the requirement of V/F input, the voltage signal is controlled within 0.1V after passing through the attenuator 11, in order to ensure the measuring precision, the voltage input to the attenuator 11 is required to be not more than 100V, and the voltage is divided into four ranges of 0.1V, 1V, 10V and 100V.
The impedance matching device 12 and the impedance transformation and amplification circuit in the amplifier 13 comprise an LF356 operational amplifier U1 and an LF356 operational amplifier U2, a terminal corner 3 of an LF356 operational amplifier U1 is connected with the other end of a resistor R7, a terminal corner 7 of an LF356 operational amplifier U1 is connected in parallel with + VCC, a series capacitor C9 is connected with terminal corners 4 and-VCC ends, a terminal corner 6 of an LF356 operational amplifier U1 is connected with a parallel port of the resistor R12, the resistor R13 and the resistor R15, the other end of the resistor R12 is connected with a parallel port of a resistor R14 connected in series with the resistor R13 and a variable resistor R24 connected with the terminal corner 2, a variable resistor R10 connected in series with a resistor R11 at a common ground end, the other end of the resistor R12 is connected with a feedback resistor R16 connected in parallel with a terminal corner 2 of the LF356 operational amplifier U2, a terminal corner 7 + 7 of an LF356 operational amplifier U2 is connected in parallel with VCC, a series capacitor C10 is connected with the terminal VCC ends, a resistor R864 is connected in parallel with the resistor R597 and a resistor R8658, the other end of the resistor R19 is connected with the parallel connection port of the resistor R21 connected in series with the resistor R20 and the variable resistor R17 connected with the terminal angle 3, and the variable resistor R17 and the series resistor R18 are connected with the common ground.
The signal passing through the attenuator 11 is input into an impedance matcher 12, the impedance matcher 12 and an amplifier 13 both adopt a low-drift high-speed high-input impedance operational amplifier LF365, which has the advantages of small drift of compensation voltage, high output slew rate which is about 10 times of that of a bipolar operational amplifier, and the maximum characteristics of small input current which is about pA order of magnitude, direct current to 1.1MHz bandwidth, 39dB signal-to-noise ratio, the first stage adopts an LF356 operational amplifier U1 to realize impedance conversion, the signal after the impedance conversion is input into a negative feedback amplifying circuit consisting of another LF356 operational amplifier U2, and the amplification factor can be changed by adjusting a resistor R17, so that the output voltage of the amplifier in a measuring range is limited within 1V, and a 54LS628 voltage-controlled oscillator U3 works in a linear region.
A pin 11 series resistor R23 of a 54LS628 voltage-controlled oscillator U3 in a voltage-controlled oscillator 14 is connected to a pin 12, a pin 10 of a 54LS628 voltage-controlled oscillator U3 is connected with a super capacitor C11 and a pin 1 and is connected to the common ground end in parallel, a pin 3 series capacitor C12 is connected to a pin 4, a pin 7 series capacitor C13 is connected to a pin 9 connected with + VCC, and a pin 3 is connected to a parallel connection port of a diode D8 and a capacitor C14.
Before a signal enters a driver 15, a voltage signal needs to be converted into a frequency signal for controlling a driving circuit, a voltage-controlled oscillator 54LS628 is a 14-pin integrated block, the power supply voltage is 5V, input and input reference voltages are 0-5V, the high-level input current is-1.2 mA, the low-level output current is 12mA, the maximum linear output frequency is 20MHz, the use temperature is-55-125 ℃, the output frequency range of the voltage-controlled oscillator under a certain input voltage can be changed by changing an external capacitor C12 and the reference voltage so as to adapt to the measurement requirement, and the reference voltage can be connected with a voltage stabilizing tube through a 12-pin of the voltage-controlled oscillator.
The base electrode of a high-speed switching triode V10 in the driver 15 is connected with the positive electrode of a diode D8, the emitter electrode series resistor R27 of a high-speed switching triode V10 is connected with the common ground end, the collector electrode of the high-speed switching triode V10 is connected with a diode V9 and a capacitor C15 which are connected in series, and R26 is connected with + VCC, and the capacitor C14 is connected with the parallel connection port of a resistor R24 and an adjustable varistor R25.
The voltage signal passes through a 54LS628 voltage-controlled oscillator U3, a pulse signal with a certain frequency is output, a driving circuit of the driver 15 drives a photoelectric device to emit light through the pulse signal, so that photoelectric conversion is achieved, the adopted driving circuit is composed of a high-speed switching triode V10, a switching diode V8 and a capacitor C14, a charging and discharging loop formed by parallel connection of V8 and C14 is controlled through the pulse output by the 54LS628 voltage-controlled oscillator U3, and the loop controls the base current of the high-speed V10, so that the light-emitting frequency of the light-emitting device is controlled.
In summary, the following steps: the converter for the high-voltage measurement system has the advantages that the V/F converter 1 can convert a measurement signal into a frequency modulation signal for driving the light emitting diode, and an optical pulse signal is transmitted in a digital signal mode, so that the converter has good linearity and temperature stability, and simultaneously has strong anti-electromagnetic interference capability and environmental temperature interference capability.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A converter for high voltage measurement systems, comprising a V/F converter (1) mounted in the high voltage part of the sensor, characterized in that: the V/F converter (1) comprises an attenuator (11), an impedance matcher (12), an amplifier (13), a voltage control oscillator (14) and a driver (15), wherein one end of the attenuator (11) is connected with an input signal, and the other end of the attenuator (11) is connected with the impedance matcher (12), the amplifier (13), the voltage control oscillator (14) and the driver (15) with a light emitting diode on an optical cable in sequence.
2. A converter for a high voltage measurement system according to claim 1, characterized in that: an input end of the attenuator (11) is connected with a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and a resistor R7 which are connected with the voltage of 0.7V, the other end of the resistor R1 is connected with a common ground end, the other end of the resistor R2 is connected with a parallel connection port of the resistor R3, the resistor R7, the resistor R7V and the common ground end, a capacitor C1 is connected with a capacitor C3 and a capacitor C5 in series and is connected with a parallel connection port of the capacitor C7, the resistor R7 and the common ground end, a capacitor C2 is connected with a capacitor C4 and a capacitor C6 in series and is connected with a parallel connection port of the capacitor C8, a resistor R7 and the common ground end, the other end of the resistor R3 is connected with a resistor R4, a resistor R7, a resistor 0.7V and a parallel connection port of the common ground end, and the other end of the resistor R4 is connected with a resistor.
3. A converter for a high voltage measurement system according to claim 1, characterized in that: the impedance matching device (12) and the impedance conversion and amplification circuit in the amplifier (13) comprise an LF356 operational amplifier U1 and an LF356 operational amplifier U2, an end corner 3 of an LF356 operational amplifier U1 is connected with the other end of a resistor R7, an end corner 7 of an LF356 operational amplifier U1 is connected in parallel with + VCC, a series capacitor C9 is connected with end corners 4 and-VCC, an end corner 6 of an LF356 operational amplifier U1 is connected with a parallel connection port of the resistor R12, the resistor R13 and the resistor R15, the other end of the resistor R12 is connected with a resistor R14 connected in series with the resistor R13 and a parallel connection port of a variable resistor R10 connected with the end corner 2, a variable resistor R10 series resistor R11 is connected with a common ground, the other end of the resistor R15 is connected with a feedback resistor R16 connected in parallel with the end corner 2 of the LF356 operational amplifier U2, the end corner 7 of the LF356 operational amplifier U2 is connected in parallel with + VCC, the series capacitor C27 is connected with the resistor R864, the resistor R8672 and the resistor R8658, the other end of the resistor R19 is connected with the parallel connection port of the resistor R21 connected in series with the resistor R20 and the variable resistor R17 connected with the terminal angle 3, and the variable resistor R17 and the series resistor R18 are connected with the common ground.
4. A converter for a high voltage measurement system according to claim 1, characterized in that: a pin 11 series resistor R23 of a 54LS628 voltage-controlled oscillator U3 in the voltage-controlled oscillator (14) is connected to a pin 12, a pin 10 of a 54LS628 voltage-controlled oscillator U3 is connected with a super capacitor C11 and a pin 1 and is connected to the common end in parallel, a pin 3 series capacitor C12 is connected to a pin 4, a pin 7 series capacitor C13 is connected to a pin 9 connected with + VCC, and a pin 3 is connected to a parallel connection port of a diode D8 and a capacitor C14.
5. A converter for a high voltage measurement system according to claim 1, characterized in that: the base electrode of a high-speed switching triode V10 in the driver (15) is connected with the positive electrode of a diode D8, an emitter electrode series resistor R27 of a high-speed switching triode V10 is connected with the common ground end, the collector electrode of the high-speed switching triode V10 is connected with a diode V9 and a capacitor C15 which are connected in parallel, a series resistor R26 is connected with + VCC, and a capacitor C14 is connected with the parallel connection port of a resistor R24 and an adjustable varistor R25.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920129561X | 2019-01-24 | ||
| CN201920129561 | 2019-01-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209961826U true CN209961826U (en) | 2020-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920327327.8U Expired - Fee Related CN209961826U (en) | 2019-01-24 | 2019-03-14 | Converter for high-voltage measurement system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11549973B1 (en) | 2021-08-26 | 2023-01-10 | Keysight Technologies, Inc. | System for measuring voltage using pulse width modulator or voltage controlled oscillator |
-
2019
- 2019-03-14 CN CN201920327327.8U patent/CN209961826U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11549973B1 (en) | 2021-08-26 | 2023-01-10 | Keysight Technologies, Inc. | System for measuring voltage using pulse width modulator or voltage controlled oscillator |
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Granted publication date: 20200117 Termination date: 20210314 |