CN2141676Y - Electric rice pot timing and pressure regulating device - Google Patents

Abstract

The utility model relates to an electric rice pot timing and pressure regulating device. A single timing and a cycle timing two working modes are realized by adopting an integrated oscillator whose output is connected with a triode and is connected to the grid electrode of a silicon controlled rectifier through a trigger diode; an electric rice pot is made to not only boil dry rice but also boil watery rice or cook soup. The utility model can also be applied to other electric appliances requiring timing and regulating pressure.

Description

Electric rice pot timing and pressure regulating device

The utility model relates to a kind of electric apparatus control apparatus, particularly a kind of timing regulator that is used for electric cooker control.

The family expenses electric cooker mainly is to be used to boil dry meal, operation principle is when rice moisture content is approaching in pot when boiling dry, pot end temperature rises, the semiconductor temperature-control element disconnects the power supply of heating element heater in the electric cooker, and when temperature descends gradually in pot, the temperature at pot end is also descended thereupon, and the semiconductor temperature-control element makes the heating element heater power connection again, thereby reaches the purpose of boiling rice and insulation.In order to enlarge the purposes of electric cooker, the electric cooker porridge making appliance has appearred in the market, its principle is to reduce the voltage (virtual value) that puts on heating element heater in pot by controllable silicon, the thermal power of heating element heater is reduced, reached the purpose that is equivalent to direct-fired heater low baking temperature shelves, but unattended for a long time when electric cooker work, gruel might boil into cooked rice, it is not too convenient to use, and effect is also undesirable.

The purpose of this utility model provides a kind of pressure regulation temperature control of electric cooker heating element heater and the control device of time switch, makes electric cooker can boil meal dry, also can cook congee and burns soup.

Task of the present utility model is finished like this: by adopting the integrated programmable oscillator as timing element, the output of oscillator connects triode, and finish to the silicon controlled grid by diac.The utility model is made up of power supply, timing element, regulating circuit and controllable silicon, and programmable oscillator (IC4541) constitutes the control circuit of time switch and circulation time switch.IC4541 inside comprises an oscillator, programmable 16 grades of two-dividers, and control circuit and output control circuit automatically reset.Pin 1 to 3 pin of IC4541 is a pierce circuit external resistor and capacitor component end, when resistance R that 3 pin institute connecting resistance is connect greater than 4 times the 1st pin, the running clock cycle of oscillating circuit is that 2.3RC(C is the capacitance that the 2nd pin is connect), 5 pin are the end that automatically resets, and CD4541 powers on and can automatically reset when its ground connection.6 pin are the hand-reset end, and high level is effective, and 8 pin are output, and 9 pin are the output selecting side, and the output original state after being used for selecting to reset is low level or high level.10 pin are the working mode selection end, select single timing mode during for " 0 ", and timing is then exported the generation saltus step, and the output potential after the saltus step will remain to reset signal always and arrive.When 10 pin are " 1 ", select the periodic duty mode, output is with the cycle saltus step, and 13,12 pin are frequency divider programming input, and the relation of bipod level and divider ratio is as follows:

13 pin, 12 pin divider ratios

0 1 256

1 0 1024

0 0 8192

1 1 65536

The utility model connects the required oscillating element of oscillator with the 1st, 2,3 pin of CD4541, the 1st pin resistance series connection potentiometer wherein, as the clock cycle of regulating oscillator, 5 pin and 6 pin ground connection, being powers on automatically resets, hand-reset is invalid, frequency divider programming termination high level, and the divider ratio that makes IC4541 is 65536.The mid point of the working mode selection termination switch of the 10th pin, when the switch opens high level, making IC4541 is the periodic duty mode, when switch was got to low level, IC4541 was single timing mode work.Output control triode conducting or the shutoff of IC4541, thus control silicon controlled grid makes its conducting or shutoff.When IC4541 is operated in single timing mode, timing is then exported saltus step, and triode is turn-offed, and controllable silicon turn-offs.Because output remains unchanged, so silicon controlled turn-offs always and keeps, and when IC4541 is operated in the periodic duty mode, output is multiplied by divider ratio with clock cycle of oscillator and does the cycle saltus step.Make the periodically conducting and closing of triode and controllable silicon.The silicon controlled angle of flow can be regulated the silicon controlled angle of flow by the control of potentiometer and capacitance partial pressure, regulator potentiometer, thereby control is added to voltage effective value on the electric cooker heating element heater.Power supply step-down of the present utility model is by the voltage-stabiliser tube voltage stabilizing, and capacitance resistance series connection current limliting constitutes.

Accompanying drawing is an electric schematic circuit of the present utility model, and as Figure of abstract.

The utility model is described in further detail below in conjunction with drawings and Examples.

C in the accompanying drawing ₂, R ₁, D ₁And D ₂Play the current limliting step-down, at D ₁Two ends obtain the required low level of integrated circuit, C ₃Be filter capacitor.R ₁, W ₁, C ₄And R ₃Be the oscillating element of IC4541, because R ₃＞＞(R ₂+ W ₁).The cycle of IC4541 oscillating circuit is 2.3(R ₂+ W ₁) C ₄, regulator potentiometer W ₁, can change cycle of oscillation, thereby play the effect of regulating timing.K switch can select 10 pin of IC4541 to connect high level or low level, thereby selects single timing working mode or circulation timing working mode.The output of IC4541 the 8th pin is through resistance R ₄, R ₅Be added to the base stage of triode T.When IC4541 output high level, triode T conducting, power supply is through load W ₂To C ₅Charging is when charging voltage is higher than diac D ₃Trigger voltage the time, capacitor C ₅To controllable silicon BT discharge, make the controllable silicon conducting.When the IC4541 output low level, triode T ends, W ₂Electric current through D ₃By R ₆Switch to ground, can not trigger controllable silicon BT, controllable silicon ends.Regulate W ₂Size, can change the time constant of charging, reach the purpose of regulating the controllable silicon BT angle of flow.The voltage effective value that is added to electric cooker through controllable silicon BT is changed, realize regulating the thermal power of electric cooker heater element, C ₁, L and C ₆Be filter element, reduce the controllable silicon conducting by the electrical interference that produces.

The utility model has been realized regularly two kinds of working methods of single timing and circulation, makes electric cooker can boil meal dry, also can cook congee or boil soup, and is convenient and practical, is suitable for using on the electric cooker, also can be applicable to other and needs the regularly electrical equipment of pressure regulation.

Claims (1)

1. A kind of electric cooker is regulator regularly, is made up of power supply, timing element, regulating circuit and controllable silicon, it is characterized in that timing element adopts the integrated programmable oscillator, and the output of oscillator connects triode, and arrives the silicon controlled grid by diac.

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