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Low-interference food processing machine

A food processing machine, food processing technology, applied in the direction of program control, control/regulation system in instruments, sequence/logic controllers, etc., can solve the problems of increased cost, complex circuit structure, and increased volume of anti-electromagnetic interference devices, Achieve the effect of solving electromagnetic interference problems and reducing interference

Active Publication Date: 2015-10-07
JOYOUNG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, some filter circuits are generally directly added to solve electromagnetic interference. In order to meet the requirements of the standard, the parameters of the filter circuit are increased without limit, resulting in an increase in the cost and volume of the entire anti-electromagnetic interference device, etc. , and makes the structure of the circuit more complicated, so a single increase of anti-electromagnetic interference equipment cannot perfectly and comprehensively solve the interference of food processors

Method used

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Examples

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Effect test

Embodiment 1

[0035] A low-interference food processing machine of the present invention includes a control circuit, the control circuit includes a load for food processing, a load circuit for driving the load, and a control chip, the load circuit includes a switch, and the switch is thyristor, wherein the control chip controls the thyristor in a drop-wave manner, the control chip controls the thyristor with a trigger pulse, and the rising edge of the trigger pulse is at the zero-crossing point of the power supply voltage, so The above trigger pulse is maintained until the rate of change of the power supply voltage is minimum.

[0036] In this embodiment, the load is a heating device, the thyristor is a triac, the control chip controls the heating device by triggering the thyristor, and the control chip triggers the Before the thyristor, the control chip needs to detect the zero-crossing point of the power supply through a zero detection circuit, and the control chip outputs a trigger pulse...

Embodiment 2

[0049] The difference with the above-mentioned embodiment 1 is that, as figure 2 As shown, the control circuit includes a power supply voltage detection circuit, and the control chip detects the power supply voltage at an interval time t1 through the power supply voltage detection circuit, and calculates the voltage rising slope of the two detection voltages before and after each time interval, so as to obtain the power supply voltage The minimum voltage change rate.

[0050] When the AC positive half-wave is input, after the resistors R11 and R12 divide the voltage, and the capacitor C8 filters, the control chip detects the Vad voltage at an interval of t (t=100us), and calculates the voltage rising slope of the two detection voltages vad1 and vad2 before and after k= (vad2-vad1) / t, when K=0, remove the trigger pulse.

Embodiment 3

[0052] The difference between this embodiment and the above-mentioned embodiment 1 is that, as image 3 As shown, the load includes a heating device and a motor, and the load circuit includes a heating control circuit, a motor control circuit, the heating control circuit, and a motor control circuit. In this embodiment, the heating control circuit and the motor control circuit are connected in parallel between the power supply, the motor control circuit includes an anti-electromagnetic interference circuit and a motor drive circuit, and the input end of the anti-electromagnetic interference circuit is electrically connected to the power supply, the output end of the electromagnetic interference circuit is electrically connected to the motor drive circuit.

[0053] Such as Figure 4 As shown, the anti-electromagnetic interference circuit includes:

[0054] A common mode inductor L1, the two input ends of the common mode inductor L1 are respectively connected to the live wire ...

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Abstract

The invention discloses a low-interference food processing machine, comprising a control circuit. The control circuit comprises a load for food processing, a load circuit for driving the load to work and a control chip. The load circuit comprises a switch which is a thyristor. The control chip controls the thyristor in a wave leaking way. The control chip controls the thyristor with a trigger pulse. A rising edge of the trigger pulse is at a zero-crossing point of power supply voltage. The trigger pulse maintains at the point of a minimum rate of change of the power supply voltage. The control chip can remove the trigger pulse at the minimum rate of change of the power supply voltage by adjusting the maintaining time of the thyristor trigger pulse, the interference brought by the thyristor trigger can thus be reduced, and the problem of magnetic interference of the resistive load is solved.

Description

technical field [0001] The invention relates to a food processing machine, in particular to a low-interference food processing machine controlled by a thyristor. Background technique [0002] Food processors have been used by more and more home users due to their quickness and convenience. The existing commonly used household food processors basically include the following types: electric heating appliance food processors, electric appliance food processors, and food processors combining electric heating and electric heating to achieve crushing or heating and cooking of materials. The crushing of materials is generally carried out by motors, and the heating of materials is carried out by heating devices. In the prior art, motors are inductive components, and the heating devices generally also use resistive heating loads. In the control of food processing machines, in order to realize intelligent pulping, semiconductor electronic switching devices such as thyristors are gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/04
CPCG05B19/0423
Inventor 王旭宁余青辉吴涯金文伟
Owner JOYOUNG CO LTD
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