Liquid level induction control device and electric appliance possessing the liquid level induction control device
A liquid level sensing and control device technology, applied in liquid level control, signal device, non-electric variable control and other directions, can solve the problems of loss of function, unsanitary, complex mechanical control, etc., to prevent liquid overflow, control liquid level, The effect of good level sensing effect
Inactive Publication Date: 2008-04-30
ETERNAL (GUANGDONG) ELECTRIC HLDG LTD
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Problems solved by technology
[0002] At present, the liquid level control of household appliances adopts the photoelectric isolation / reflection method. When the liquid level rises to a certain high level, the signal light is blocked or reflected to operate, but this method is prone to malfunction. Once the photosensitive head is polluted or If blocked, the function will be lost
There is also a liquid level ball control method, but the mechanical control of this device is complicated; the second is to put the liquid level ball into the cup / pot, causing problems such as inconvenient use and unhygienic
There are also pressure sensors or pressure sensing devices added to the bottom of the cup / pot, but in this way, the problem of overflowing the soymilk machine cannot be solved
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[0012] As shown in Figure 1, a liquid level sensing control device of the present invention includes a high-frequency signal wave generation circuit 2, a liquid level detection circuit 3 that can input a variable voltage signal to a microprocessor 1 when the liquid level changes, and a circuit controlled by the microprocessor. The processor 1 outputs a control signal to operate the driving circuit 4; the liquid level sensing control device also includes a liquid level selection circuit 5 and an audible and visual alarm circuit 6.
[0013] As shown in Figure 2, the high-frequency signal wave generation circuit 2 utilizes a single-chip microcomputer or discrete electronic components to generate an oscillation waveform, which can be a square wave, a triangle wave or a sine wave, and the frequency can be 1K to 500Khz; the high-frequency signal wave generation circuit 2. Composed of transistors Q1, Q2, resistors R1, R2, R3, R4, and capacitors C1, C2, C3, and C4. The emitter of trans...
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The invention discloses a liquid level sensor control device and an electrical appliance provided with the liquid level sensor control device. The liquid level sensor control device comprises a microprocessor (1), and also comprises a high-frequency signal wave generating circuit (2), a level detection circuit (3) that inputs voltage changing signals to the microprocessor (1) when the liquid level changes, and a drive circuit (4) that works when the microprocessor (1) outputs control signals. The liquid level sensor control device of the invention constructs a capacitor device between liquid by using a touch-P1, when the level changes, the capacitance value also changes, thereby leading to voltage signals changing in a circuit. After the recognition and treatment of the microprocessor (1), a signal is sent to a driver circuit (4) to control the action of electrical components that stops filling liquid into a liquid cup (8) or stops working of the electrical components to prevent the liquid from overflowing the liquid cup (9). Compared with the prior art, the liquid level sensor control device of the invention has the advantages of good level effect, effectively controlling the level of the liquid and preventing the liquid from overflowing.
Description
technical field [0001] The invention relates to an electronic control device, in particular to a liquid level sensing control device. In addition, the invention also relates to an electrical appliance with the liquid level sensing control device. Background technique [0002] At present, the liquid level control of household appliances adopts the photoelectric isolation / reflection method. When the liquid level rises to a certain high level, the signal light is blocked or reflected to operate, but this method is prone to malfunction. Once the photosensitive head is polluted or If blocked, the function will be lost. There is also a liquid level ball control method, but this device has complicated mechanical control; the second is to put the liquid level ball into the cup / pot, causing problems such as inconvenient use and unhygienic. There are also pressure sensors or pressure sensing devices added to the bottom of the cup / pot, but in this way, the problem of overflowing the ...
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IPC IPC(8): G05D9/12H03K3/281G08B7/00
Inventor 官阔荣
Owner ETERNAL (GUANGDONG) ELECTRIC HLDG LTD