Micro power control device
A technology of control devices and micro-electric energy, applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problems of basic error time reduction and other problems
Active Publication Date: 2017-01-04
TIANJIN INST OF METROLOGICAL SUPERVISION & TESTING
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Problems solved by technology
According to the method widely used at present, the time required for the basic error test, starting test and creep test in the accuracy test of the electric energy meter is still possible to be further reduced
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[0019] Figure 2-5 A realization scheme using analog circuit is given. in figure 2 For the control module circuit diagram, image 3 For the measurement / prediction module circuit diagram, Figure 4 is the circuit diagram of the pulse shaping module 19 in the measurement / prediction module, Figure 5 is a circuit diagram of the pulse shaping module 20 in the measurement / prediction module.
[0020] figure 2 Among them, U1 and U5 are NOT gates. U2 and U3 are D flip-flops triggered by rising edges. When it is low level, the output terminal Q is always low level. U4 is an OR gate, U6 is an exclusive OR gate, and U7 and U8 are AND gates. C1 and R1 form a pulse generating circuit. When the Q terminal of U3 is at a high level, the circuit outputs a pulse, and the pulse width is adjusted by C1 and R1.
[0021] image 3 Among them, K1 and K2 are switches, which are controlled by the input terminal 8. They are closed at low level and disconnected at high level. Modules 19, 20...
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Disclosed is a micro electric-energy controlling device which is applied to a metering accuracy test of an (electronic or electromechanical) electric-energy meter and the micro electric-energy controlling device can be installed in an electric-energy meter calibration device or installed externally as an independent module and plays a role of reducing test time in a starting, shunt running and basic error test. The device includes control, measurement / prediction and control switch modules. The device realizes micro electric-energy output control through switch-on and switch-off of the voltage of a tested meter and the working process is as follows: the device enables a controlled switch to be closed and the tested meter sends high-frequency pulses under a large current; the device enables a capacitor to be charged after receiving a first pulse and enables the capacitor to be discharged after receiving a second pulse; after 0 level is reached through discharging, the controlled switched is switched off and the tested meter stops working; the ratio of charging and discharging time constants is enabled to reach 10 / 9 and then the tested meter stops and enters a state of extremely low under-electric-energy. After all the tested meters enter the state, the large current is cut off and all controlled switches are switched on and a test current is connected to start an accuracy test.
Description
[0001] 1. Technical field [0002] The invention is applied to the measurement accuracy test of (electronic or electromechanical) electric energy meters, and can be installed inside the electric energy meter calibration device, or installed outside as an independent module, in the test items of starting, creeping and basic errors play a role in reducing the test time. [0003] 2. Background technology [0004] The watt-hour meter is a measuring instrument that measures the time-varying power passed through at a rated voltage (220V) versus time. The accuracy test of the electric energy meter usually adopts the comparison method, that is, the power source sends the same power to the standard meter and the meter under test, and the error calculator receives the output pulses of the standard meter and the meter under test and calculates the relative error of the meter under test. The power source, the standard meter and the error calculator constitute the electric energy meter cal...
Claims
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IPC IPC(8): G01R35/04
Inventor 郭景涛张笑平张一萌
Owner TIANJIN INST OF METROLOGICAL SUPERVISION & TESTING