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Contact resistance detection circuit and method
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A technology of contact resistance and detection circuit, which is applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc. It can solve problems such as excessive contact resistance and damage to heating devices, so as to improve safety and avoid system errors. Effect
Pending Publication Date: 2020-03-31
ZHEJIANG SHAOXING SUPOR DOMESTIC ELECTRICAL APPLIANCE CO LTD
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[0005] The embodiment of the present invention provides a detection circuit and method for contact resistance to at least solve the technical problem of damage to the heating device due to excessive contact resistance of the heating device in the prior art
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Embodiment 1
[0028] According to an embodiment of the present invention, an embodiment of a detection circuit for contact resistance is provided.
[0029] figure 1 is a schematic diagram of a contact resistance detection circuit according to an embodiment of the present invention, as figure 1 As shown, the detection circuit may include: a bridge circuit 10 and a processor 20, the bridge circuit 10 includes: a first resistor 11, a second resistor 12, a variable resistor 13 and a contact resistor 14 of a heating device, and the processor 20 includes : the first input terminal, the second input terminal, the first output terminal and the second output terminal.
[0030] Wherein, the first resistor 11 is connected between the first terminal and the second terminal of the bridge circuit 10, the second resistor 12 is connected between the first terminal and the fourth terminal of the bridge circuit 10, and the variable resistor 13 is connected between Between the second end and the third end o...
Embodiment 2
[0048] According to an embodiment of the present invention, an embodiment of a method for detecting contact resistance is provided. It should be noted that the steps shown in the flow chart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and , although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.
[0049] image 3 It is a flowchart of a method for detecting contact resistance according to an embodiment of the present invention, such as image 3 As shown, the method includes the following steps:
[0050] Step S302, obtaining the voltage difference between the second end and the fourth end of the bridge circuit, wherein the bridge circuit includes: a first resistor, a second resistor, a variable resistor and a contact resistance of the heating device, and the first resistor is connected to Bet...
Embodiment 3
[0068] According to an embodiment of the present invention, an embodiment of a cooking appliance is provided, including: the contact resistance detection circuit in Embodiment 1 above.
[0069] Optionally, the above-mentioned cooking appliance may be an electric pressure cooker.
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Abstract
The invention discloses a contact resistance detection circuit and method. The detection circuit comprises a bridge circuit, the bridge circuit including a first resistor, a second resistor, a variable resistor and a contact resistor of a heating device, the first resistor being connected between the first end and the second end of the bridge circuit, the second resistor being connected between the first end and the fourth end of the bridge circuit, the variable resistor being connected between the second end and the third end of the bridge circuit, and the contact resistor being connected between the third end and the fourth end of the bridge circuit; a processor, the first output end of the processor being connected with the first end of the bridge circuit, the second output end of the processor being connected with the third end of the bridge circuit, the first input end of the processor being connected with the second end of the bridge circuit, and the second input end of the processor being connected with the fourth end of the bridge circuit. The technical problem that in the prior art, the contact resistance of a heating device is too large, and consequently the heating device is damaged is solved.
Description
technical field [0001] The invention relates to the field of household appliances, in particular to a detection circuit and method for contact resistance. Background technique [0002] The existing electromagnetic heating IH (Induction Heating) heating cooking utensils, the principle is to connect the alternating current through the electromagnetic coil and the connection of the components of the electronic circuit board to generate an alternating magnetic field. When a ferrous container is placed on the electromagnetic coil At this time, the surface of the container cuts the alternating magnetic force lines and generates alternating current (ie eddy current) in the metal part of the container bottom. The eddy current makes the carriers at the bottom of the container move at high speed and irregularly, and the carriers and atoms collide and rub against each other to generate heat energy. , so as to play a heating effect. Because the iron container generates heat by itself, ...
Claims
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Application Information
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IPC IPC(8): G01R27/02
CPCG01R27/02
Inventor 徐久平曾彬史马杰
Owner ZHEJIANG SHAOXING SUPOR DOMESTIC ELECTRICAL APPLIANCE CO LTD
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