CN101650554B

CN101650554B - Method for accurately distinguishing overflow signal of soymilk grinder and food processor in heating process

Info

Publication number: CN101650554B
Application number: CN2009100370648A
Authority: CN
Inventors: 李以勤
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-02-04
Filing date: 2009-02-04
Publication date: 2011-10-19
Anticipated expiration: 2029-02-04
Also published as: CN101650554A

Abstract

The invention relates to a method for accurately distinguishing overflow signal of a soymilk grinder and a food processor in heating process; the method is characterized in that: after the soymilk grinder is powered on, an overflowing prevention detection circuit detects weather an overflow signal exists all the time, when an overflow voltage signal appears, a control circuit leads the overflow signal to carry out A/D conversion, and the digital signal is processed, and then according to the processing result, weather the overflow is false is judged, if yes, the heating is continued, if not, a signal for stopping heating is immediately sent out to a heating pipe driving circuit, so as to control the heating pipe to stop heating and prevent the soymilk from being overflowed. The method can accurately prevent the soymilk grinder from foaming, so as to cause false overflow when in working, and lead the soymilk or liquid food to be cooked thoroughly or boiled out under the foaming condition.

Description

Accurately discern the method for spill in soy bean milk making machine and the cooking machine heating process

Technical field

The present invention relates to a kind of method, the method for spill in particularly a kind of accurate identification soy bean milk making machine and the cooking machine heating process.

Background technology

Traditional soybean milk machine and cooking machine anti-overflow testing circuit are to utilize slurries resistance to be connected with a fixed resistance R1, form a series connection bleeder circuit, change to obtain whether spill over is arranged according to the high and low level between two resistive junction.Along with novel whipping net and do not have the appearance of net soy bean milk making machine, the phenomenon that bubble before the infusion of rear end, unavoidably can occur hanging.Traditional anti-overflow testing circuit only can't be made right judgement to spill over the height of level under various conditions of work, can only adopt minimal power to heat, and does not reach fully to make that soya-bean milk or other liquid state are boiled, well-done purpose.Thereby have a strong impact on the infusion effect even boil not yet done fully.

Summary of the invention

Goal of the invention of the present invention provides a kind of soy bean milk making machine and cooking machine and prevents effectively that in use vacation from overflowing, make and under the situation of hanging bubble, can both well boil soya-bean milk or aqueous liquid foodstuff the method for spill in well-done accurate identification soy bean milk making machine and the cooking machine heating process.

Purpose of the present invention can reach by following measure: the method for spill in a kind of accurate identification soy bean milk making machine and the cooking machine heating process, it is characterized in that: after the soy bean milk making machine energising work, whether the anti-overflow testing circuit detects soy bean milk making machine always when soy bean milk making machine is worked spill over, control circuit carries out spill over behind the A/D to digital signal processing when occurring overflowing voltage signal, judge whether it is that vacation is overflowed according to result then, if overflowing, vacation then continues heating, stop heating signal to heat-generating pipe driving circuit if really overflow then to send at once, the control heat-generating pipe stops heating, prevents that soya-bean milk from overflowing.

Purpose of the present invention can also reach by following measure: the single-chip microcomputer in the control circuit converts digital signal to the variation voltage signal that anti-overflow probe one end in the received anti-overflow testing circuit produces, carry out the variation tendency that computing draws voltage in the unit interval then, and make the judgement of whether bumping pin in view of the above, in the Δ t1 time, voltage on the anti-overflow probe drops to below the Vref_C from Vref_A, single-chip microcomputer is looked this and has been changed to spill over, in the Δ t2 time, voltage changes between Vref_B and Vref_C always, single-chip microcomputer is looked this and is false spill over, there is foam to stick on the anti-overflow probe, this situation is considered as hanging bubble, in the Δ t3 time, below the Vref_C, single-chip microcomputer was looked this and is changed to true spill over when voltage dropped between Vref_C and Vref_B.Vref_A is 5～4V, and Vref_B is 3.0～2.0V, and Vref_C is 2.0～1.5V, and Δ t1 is 12ms～50mS, and Δ t2 is 150ms～300mS, and Δ t3 is 60ms～110mS.The variation tendency of anti-overflow testing circuit voltage in the following unit interval of condition of power supply of 5V voltage is: Δ V 〉=0.8V/100ms.

The present invention has following advantage compared to existing technology: can prevent accurately that soy bean milk making machine extension when work from steeping the vacation that causes and overflowing, make and under the situation of hanging bubble, can both well boil soya-bean milk or aqueous liquid foodstuff, and well-done.

Description of drawings

Fig. 1 is the circuit block diagram of implementing when of the present invention;

Fig. 2 is the circuit theory diagrams of implementing when of the present invention; Fig. 3 is an anti-overflow probe change in voltage curve map of the present invention.

Embodiment

The present invention is described in further detail below in conjunction with accompanying drawing (embodiment):

With reference to Fig. 1, Fig. 2, implement the present invention and need comprise following circuit: current rectifying and wave filtering circuit 1, anti-overflow testing circuit 2, lack of water testing circuit 3, button and indicating circuit 4, control circuit 5, motor-drive circuit 6, heat-generating pipe driving circuit 7, buzzer drive circuit 8.

After the soy bean milk making machine energising work, lack of water testing circuit 3 detects whether lack of water of soy bean milk making machine when soy bean milk making machine is worked, if lack of water then stop all work and warning.Whether anti-overflow testing circuit 2 detects soy bean milk making machine always spill over, single-chip microcomputer when occurring overflowing voltage signal in the control circuit 5 (MCU) integrated chip converts digital signal to the variation voltage signal that received anti-overflow probe one end of 2 pin of MCU integrated chip (model TAS167) produces, carry out computing then and draw a change in voltage trend, control 11 of MCU integrated chip in the control circuit 5 with variation tendency in view of the above, 14,13 pin send the duty control signal respectively to buzzer drive circuit 6 and heat-generating pipe driving circuit 7 and motor-drive circuit 8, thereby start or close motor, heat-generating pipe, or the work of buzzer siren.Anti-overflow testing circuit 2 equivalent resistance coefficient value of setting under the condition of power supply of 5V voltage is Ref_A=150～50M Ω; Ref_B=800～300K Ω; Ref_c=90～30K Ω.The value of setting of equivalent resistance coefficient is that the power supply supply voltage that obtains along with anti-overflow testing circuit 2 improves and proportional raising, and supply voltage reduces and proportional reduction.Spill over is meant soy bean milk making machine and cooking machine in heating process, runs into the anti-overflow probe when the liquid boiling slurries rise, and is called for short and bumps pin.

If by various experimental measurements as shown in Figure 3, in the Δ t1 time, the voltage on the anti-overflow probe drops to below the Vref_C from Vref_A, and the MCU integrated chip is looked this and has been changed to spill over.In the Δ t2 time, voltage changes between Vref_B and Vref_C always, spill over.In the Δ t2 time, voltage changes between Vref_B and Vref_C always, and the MCU integrated chip is looked this for false spill over, has foam to stick on the anti-overflow probe.This situation is considered as hanging bubble, and in the Δ t3 time, below the Vref_C, the MCU integrated chip was looked this and is changed to true spill over when voltage dropped between Vref_C and Vref_B.

The present invention draws to draw a conclusion through long-term experimental test: if suitably choose Vref_A (5～4V), Vref_B (3.0～2.0V), Vref_C (2.0～1.5V), Δ t1 (12ms～50mS), Δ t2 (150ms～300mS), (60ms～110mS) be worth, the present invention just can adapt to various working conditions to Δ t3.Improve the reliability of soy bean milk making machine and the work of similar food material machine, the infusion that greatly improves soya-bean milk and other aqueous liquid foodstuffs adds thermal effect.

Claims

1. accurate method of spill in identification soy bean milk making machine and the cooking machine heating process, it is characterized in that: after the soy bean milk making machine energising work, whether anti-overflow testing circuit (2) detects soy bean milk making machine always when soy bean milk making machine is worked spill over, single-chip microcomputer in the control circuit when occurring overflowing voltage signal (5) converts digital signal to the variation voltage signal that anti-overflow probe one end in the received anti-overflow testing circuit (2) produces, carry out the variation tendency that computing draws voltage in the unit interval then, and make the judgement of whether bumping pin in view of the above, if overflowing, vacation then continues heating, stop heating signal to heat-generating pipe driving circuit (7) if really overflow then to send at once, the control heat-generating pipe stops heating, prevents that soya-bean milk from overflowing.

2. the method for spill in accurate identification soy bean milk making machine according to claim 1 and the cooking machine heating process, it is characterized in that: the variation tendency of voltage is meant in the described unit interval, in the Δ t1 time, voltage on the anti-overflow probe drops to below the Vref_C from Vref_A, single-chip microcomputer is looked this and has been changed to spill over, in the Δ t2 time, voltage changes between Vref_B and Vref_C always, single-chip microcomputer is looked this and is false spill over, have foam to stick on the anti-overflow probe, this situation is considered as hanging bubble, in the Δ t3 time, below the Vref_C, single-chip microcomputer was looked this and is changed to true spill over when voltage dropped between Vref_C and Vref_B.

3. the method for spill in accurate identification soy bean milk making machine according to claim 2 and the cooking machine heating process, it is characterized in that: Vref_A is 5～4V, Vref_B is 3.0～2.0V, Vref_C is 2.0～1.5V, Δ t1 is 12ms～50ms, Δ t2 is 150ms～300ms, and Δ t3 is 60ms～110ms.

4. the method for spill in accurate identification soy bean milk making machine according to claim 1 and the cooking machine heating process is characterized in that: anti-overflow testing circuit (2) variation tendency of voltage in the following unit interval of condition of power supply of 5V voltage is: Δ V 〉=0.8V/100ms.