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Microwave oven power detection method and system

A voltage detection method and microwave oven technology, which are applied in power supply testing, measuring devices, measuring electrical variables, etc., can solve the problems of reduced detection accuracy, increased cost, and reduced safety, so as to improve the safety of use, real-time accurate detection, and reduce cost effect

Active Publication Date: 2015-01-14
WHIRLPOOL CHINA
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Problems solved by technology

[0003] At present, microwave ovens on the market generally have two schemes: linear power supply and switching power supply. At present, there are three most commonly used voltage detection methods: (1) by sampling from the secondary of the linear transformer, (2) by using high-precision voltage transformers After sampling, (3) the neutral line is shared with the functional ground and directly sampled at the strong current terminal; these three schemes will face the test of reduced safety, reduced detection accuracy and increased cost in use, so Aiming at the above problems, the voltage detection method is designed

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Embodiment 1

[0022] Such as figure 1 As shown, a voltage detection method for a microwave oven includes a voltage detection circuit, a photocoupler and a main chip, the input terminal of the voltage detection circuit is connected to the strong current circuit, and the output terminal of the voltage detection circuit is connected to the input terminal of the photocoupler. The output end of the photocoupler is connected with the input end of the main chip. The voltage detection circuit samples from the strong current circuit, and transmits the real-time sampling results to the voltage detection chip for processing. The voltage detection chip determines whether the current voltage value exceeds the preset normal use voltage range of the equipment. If it is within the preset If it is within the normal voltage range, the microwave oven operates normally; if it exceeds the normal range, continue to judge whether the current voltage value exceeds the preset voltage range or is lower than the pres...

Embodiment 2

[0024] Such as figure 2 As shown, a detection system of a microwave oven voltage detection method includes three photocoupler circuits connected in parallel with the strong current circuit, each photocoupler circuit is composed of a photocoupler and two resistors, and the photocoupler has a light-emitting a diode and a phototransistor for converting the light signal emitted by the light emitting diode into an electrical signal. The emitter of the first photocoupler U1 is grounded, and its collector is divided into two circuits, one of which is connected to the high level through the first resistor R4, and the other is connected to the main chip, and the output terminal of the external strong current signal source is connected to the luminous The diode is electrically connected; the emitter of the second photocoupler U2 is grounded, and its collector is divided into two circuits, one of which is connected to the high level through the second resistor R5, and the other is conne...

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Abstract

The invention provides a microwave oven power detection method and system. According to the method, a voltage detection circuit conducts sampling from strong current, the real-time sampling results are transmitted to a voltage detection processing chip to be processed, whether the current voltage value exceeds the preset normal service voltage range of a device or not is judged by the voltage detection chip, and if not, the device works normally; if yes, whether the current voltage value exceeds the preset voltage range or not is judged, if the current voltage is still lower than the preset voltage range, a control signal is transmitted to a corresponding optocoupler at the same time, the optocoupler transmits the isolated signal to a detection port of a main chip, a corresponding alarm or protection signal is given out after the isolated signal is processed by the main chip, and protection of a whole microwave oven is achieved. By means of the microwave oven power detection method, real-time and precise voltage detection is achieved, the use safety of the microwave is improved, and the cost is reduced.

Description

[0001] technical field [0002] The invention belongs to the technical field of power measurement and control, and in particular relates to a power detection method and a detection system for a microwave oven. Background technique [0003] At present, microwave ovens on the market generally have two schemes: linear power supply and switching power supply. At present, there are three most commonly used voltage detection methods: (1) by sampling from the secondary of the linear transformer, (2) by using high-precision voltage transformers After sampling, (3) the neutral line is shared with the functional ground and directly sampled at the strong current terminal; these three schemes will face the test of reduced safety, reduced detection accuracy and increased cost in use, so Aiming at the above problems, the voltage detection method is designed. Contents of the invention [0004] The technical problem to be solved by the present invention is to provide a power supply d...

Claims

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Application Information

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IPC IPC(8): G01R19/165G01R31/40
Inventor 杨文军金友华杨宇澄金乃庆童怀俊陈绍一
Owner WHIRLPOOL CHINA
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