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A short circuit detection circuit and method, control circuit

A short-circuit detection and control circuit technology, applied in short-circuit testing, electrical measurement, program control, etc., can solve problems such as fire and excessive power of the whole machine, and achieve the effect of preventing the power of the whole machine from exceeding the standard and eliminating fire hazards.

Active Publication Date: 2020-07-31
GUANGDONG MIDEA KITCHEN APPLIANCES MFG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, one of the performances that must be possessed in the safety compliance of Japan's JET certification is to prevent the circuit control board from being short-circuited, causing multiple relays to work at the same time, causing the power of the whole machine to exceed the standard, causing the danger of fire
[0003] However, the circuit control board of home appliances often includes multiple relays for controlling different loads; therefore, the circuit control board of home appliances may cause multiple relays to work at the same time due to a short circuit, which will cause the entire Engine power exceeds the standard, causing the danger of fire

Method used

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  • A short circuit detection circuit and method, control circuit
  • A short circuit detection circuit and method, control circuit
  • A short circuit detection circuit and method, control circuit

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Embodiment Construction

[0040] figure 1 For the structural schematic diagram of the existing relay drive circuit, refer to figure 1 As shown, the relay drive circuit includes: relay Relay1, transistor Q1, reverse freewheeling diode D1 and current limiting resistor R1. The relay includes a fixed terminal and a control terminal, the fixed terminal is connected to a first preset voltage source, for example, the first preset voltage source may be 12V, and the control terminal is connected to the collector of the transistor Q1. When the input voltage is at a high level (for example, the high level is 5V), the relay is in a conducting state. At this time, since the transistor Q1 is conducting, the voltage at the control terminal of the relay is between the collector and the emitter of the transistor Q1. Voltage, the voltage is close to 0V; when the input voltage is low (for example, the low level is 0V), the relay is in the off state, at this time, due to the conduction of the relay coil, the voltage of t...

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PUM

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Abstract

The invention discloses a short-circuit detection circuit applied to a control circuit at least including two relay drive circuits. The short-circuit detection circuit comprises a relay detection circuit and a processing circuit. The relay detection circuit is used for determining operation states of relays in all relay drive circuits based on voltages of control terminals of the relays in the relay drive circuits. The processing circuit is used for determining whether the control circuit is in a short circuit state according to input voltages of all relay drive circuits and the operation states of relays in all relay drive circuits. In addition, the invention also discloses a short-circuit detection method and a control circuit.

Description

technical field [0001] The invention relates to the field of home appliances, in particular to a short-circuit detection circuit and method, and a control circuit. Background technique [0002] The home appliance industry, such as the microwave oven industry, occupies a large market share at home and abroad. In order to improve the performance of products and meet people's needs for safety performance, it is inevitable to bring safety certification for home appliances. Problems; such as the certification of Underwriters Laboratories (UL, Underwriter Laboratories Inc.) in the United States, and the certification of JET (Japan Electrical Safety & Environment Technology Laboratories) in Japan. Japan's JET certification, in particular, attaches great importance to the safety certification of home appliances and requires newly designed home appliances to meet their safety and compliance requirements. Among them, one of the performances that must be possessed in the safety compli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/52G05B19/042
CPCG01R31/50G05B19/042
Inventor 朱慧君
Owner GUANGDONG MIDEA KITCHEN APPLIANCES MFG CO LTD