Wide-voltage-range automatic gear shifting circuit for passive secondary circuit check meter
A secondary loop, automatic shifting technology, applied in the field of electrical measurement, can solve the problems of small dynamic range input, large volume, slow switching speed of relays, etc., to achieve fast execution speed, high reliability, expansion/reduction Effects of Dynamic Input Range
Pending Publication Date: 2021-12-21
HANGZHOU PUAN TECH
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Problems solved by technology
[0003] Therefore, the above two solutions either have a small dynamic range input or are too bulky, and the relay has the disadvantage of slow switching gears
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[0022] It includes a resistance voltage divider circuit 1, a gear position switching drive circuit 2 and an analog-to-digital conversion circuit 3. One side of the resistance voltage divider circuit 1 is electrically connected to the gear position switching drive circuit 2, and one side of the gear position switching drive circuit 2 is connected to the analog-to-digital conversion circuit. The digital conversion circuit 3 is electrically connected;
[0023] Resistor divider circuit 1 receives the voltage signal and generates voltage values of corresponding proportions, which are applied to the field effect tube side of each photocoupler PhotoMos of the gear switching drive circuit 2, and the microcontroller / digital signal processor 202 preselects a maximum gear, then calculate the target gear according to the converted result of the analog-to-digital conversion circuit 3 read, and strobe the corresponding gear;
[0024] Resistor voltage divider circuit 1 receives the AC volt...
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The invention discloses a wide-voltage-range automatic gear shifting circuit for a passive secondary loop check meter. Thewide-voltage-range automatic gear shifting circuit comprises a resistance voltage division circuit, a gear switching drive circuit and an analog-to-digital conversion circuit, one side of the resistance voltage division circuit is electrically connected with the gear switching drive circuit, one side of the gear switching drive circuit is electrically connected with the analog-to-digital conversion circuit, the resistance voltage division circuit receives the voltage signals and generates voltage values of corresponding proportions, the voltage values are applied to field effect transistor sides of photoelectric couplers PhotoMos of the gear switching drive circuit, the microcontroller / digital signal processor preselects a maximum gear, and then a target gear is calculated according to a read conversion result of the analog-to-digital conversion circuit. According to the invention, the actuator is a photoelectric coupler PhotoMOS, the execution speed is high, the reliability is high, the number of gears can be configured as required without influencing the switching speed, so that the dynamic input range of the voltage is expanded / reduced, automatic gear shifting is realized in a software mode, and accurate detection and calculation of the voltage in a large dynamic range can be realized.
Description
technical field [0001] The invention relates to the technical field of electrical measurement, in particular to a wide voltage range automatic shift circuit for a passive secondary circuit check table. Background technique [0002] In the electrical measurement system, the traditional voltage detection uses a voltage transformer, which switches the primary or secondary taps according to the amplitude of the input signal to adapt to the optimal input range of the analog-to-digital converter ADC in the system. The volume of this type of voltage transformer Larger, smaller dynamic input range, and greater variation with ambient temperature. With the development of technology, multiple precision resistors have been used to divide the voltage. According to the range of input signal changes, analog switches or relays are used to switch close to the analog-to-digital converter ADC. It is a technical solution to input a full-scale signal, but the input voltage range of the analog sw...
Claims
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IPC IPC(8): G01R15/09
CPCG01R15/09
Inventor 曹磊杨盛德白福庆
Owner HANGZHOU PUAN TECH