A method for detecting residual voltage
A technology of residual voltage and detection method, applied in the direction of measuring current/voltage, measuring device, measuring electrical variable, etc., can solve problems such as unfavorable requirements, inability to measure, and large fluctuation of detected values, so as to improve monitoring accuracy and overcome randomness. uncertainty and uncertainty, the effect of improving accuracy
Active Publication Date: 2018-08-14
四川新环佳科技发展有限公司
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In the existing standard, GB4706.1-2005 stipulates that the voltage value should be measured after a delay of 1s after disconnecting the power supply at the peak voltage. This method can be measured for capacitive loads, but for loads with other characteristics The maximum residual voltage cannot be measured; or according to the requirements of Chapter 15 (Limitation of Voltage and (or) Energy) of GB9706.1-2007 "Medical Electrical Equipment Part One: General Safety Requirements", the equipment connected to the power supply with a plug (Medical Instrument Standards) stipulates that it must be designed so that the voltage between each power pin and between each power pin and the equipment shell does not exceed 60V 1 second after the plug is unplugged, and the voltage value is measured 10 times after random power-off, and the maximum value is taken As a measured value, this random power-off measurement method of 10 times obviously cannot measure the value at the most dangerous moment
[0004] Among the existing residual voltage detection methods, the waveform observation method is only suitable for roughly calculating the residual voltage
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[0023] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0024] Such as figure 1 The illustrated embodiment provides a residual voltage detection method, including the following steps:
[0025] (1) Under a constant ambient temperature T, turn on the power supply of the tested device to make the tested device in a normal working state; as the first step of this method, it is necessary to ensure that the temperature of the power supply and the temperature of the tested device are within The working conditions are the same, for example, T0. Preferably, in other testing processes, each time the power of the tested device is turned on to make the tested device in a normal working state, the temperature of the power supply and the temperature of the tested device keep T0 unchanged when the device is not powered on.
[0026] (2) Monitor the phase of the detected device and the phase of the power supply;
[0027] ...
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The invention provides a method for detecting residual voltage in order to improve the detection precision of the residual voltage. The voltage change and phase change of a detected device are acquired during power source zero passage, the average value rule of the detected device is analyzed, a residual voltage acquisition moment at certain temperature is calculated according to the average value rule, and the problem that the detection precision of the residual voltage is affected by selection of delay time and temperature drift in the prior art is solved.
Description
technical field [0001] The invention belongs to the technical field of voltage detection, and more specifically relates to a residual voltage detection method. Background technique [0002] The establishment of residual voltage is due to the existence of energy storage devices in the power supply circuit of electrical equipment. If the capacity of the energy storage device in the circuit is large enough, the resistance of the electric energy release resistor is also large enough. Although the energy stored in the energy storage device is small, the existing The time is very short, but the residual voltage generated will also cause electric shock accidents. With the development of intelligent instruments and intelligent control technology, the electronic process of household appliances is also deepening, and electronic design will use energy storage devices such as capacitors and inductors. If the capacity of the energy storage device in the power circuit is large enough, the...
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IPC IPC(8): G01R19/00
CPCG01R19/00
Inventor 张敬华程映忠王松
Owner 四川新环佳科技发展有限公司