CN2602409Y - Control circuit for electrical heating thermos bottle - Google Patents

Abstract

The utility model discloses a controlling circuit for the electric thermo pot, comprising a heat preservation circuit and a lock/relieve circuit. The heat preservation circuit comprises a heater RL1 for boiling the water, a heat preservation heater RL2, RL2 controls the flow of the semi-wave current through respectively parallel connected with the diode D5 and a controlled silicon SCR, the through or broke of the current of the SCR and RL1 is controlled after comparing the signals of the water-temperature detecting circuit; the lock/relieve circuit comprises a driving loop, a relieve controlling circuit and a relive timelag circuit which is composed with a resistance R11 and R12 serially connected which are connected with the input of the photocoupler PC3, and the output of the photocoupler PC3 is connected with the anode of the capacity C4. The utility model is of good heat preservation effect and energy saving, which can guarantee the continuity of the water suction, avoiding the repeated operation. After the water suction finished, a locking state can be recovered in a short time.

Description

The control circuit of electric-heating thermos

Technical field

The utility model relates to the control circuit of electric-heating thermos, especially designs the energy-saving heat preserving and the release delay control circuit of electric-heating thermos.

Background technology

The control circuit of electric-heating thermos generally comprises thermal circuit and this two parts circuit of locking/relieving circuit is formed.

Technology aspect the electric-heating thermos energy-saving heat preserving, in the existing product, great majority adopt large power uninterrupted insulation (as Fig. 1), with the insulation at intermittence (as Fig. 2) of the akin useful temperature controller control of the present invention and the insulation of controlling with relay at intermittence (as Fig. 3).More than the shortcoming of the working method of three kinds of circuit and existence following:

A. circuit as shown in Figure 1, muff heater RL switches on for a long time, constantly consumes electric power, and requires the power of well heater to want enough greatly, otherwise just can't keep higher water temperature at cold snap, even causes repeating to boil water.

B. circuit as shown in Figure 2, temperature controller KO connects with well heater RL, when water temperature reaches certain value, the KO outage, muff heater quits work, and when water temperature dropped to certain value, KO connected, and RL resumes work.This circuit has certain energy-conserving action, but unsatisfactory.At first, because the temperature of the temperature of temperature controller contact point tripping and reset (connection) has bigger difference (as 92 ℃ of trippings, 83 ℃ reset), cause energy-saving effect not good.When water temperature was reduced to reduction point, well heater will be switched on for a long time, and temperature controller is just understood tripping, not even tripping (as answering 92 ℃ of trippings, but the well heater consumed power can only be brought up to water temperature 91.5 ℃, and temperature controller is constantly energising just), and it is quite a few to consume electric power.Secondly, after the end to boil water, the insulation temperature controller is in off-state, and the water in the bottle replenishes without any heat, and water temperature can be fallen very soon, and higher water temperature cannot not held time longly.

C. as the circuit of Fig. 3, principle of work is similar with circuit shown in Figure 2, the control loop of relay J comes pilot relay according to water temperature, when water temperature is higher than setting value, the contact tripping of relay J, well heater RL does not work, when water temperature is lower than setting value, the contacting of relay, RL resumes work.This circuit is controlled muff heater with relay and can the big temperature difference the tripping of temperature controller and between resetting be dwindled, but has the very fast problem of well heater outage back water temperature decline equally.In addition, increase a relay and increased again the power supply burden of control panel (many Control current of relay coil)

Technology aspect the control of electric-heating thermos " locking/releasing ", the form as Fig. 4 is adopted in " locking/releasing " control of existing product, when pressing release knob K, control the loop of drawing water within a certain period of time and be in the state that to draw water, just can draw water by the water outlet knob, (reply and lock) state after the release time, then can not water outlet by the water outlet knob.There is following shortcoming in this circuit: sort circuit is after element is selected, and the time of release also is determined, if the time is oversizely fixed, after taking out low amounts of water, circuit slowly fails to reply lock-out state again, if time Ding Detai is short, when taking out more water just " release " possibly once more, inconvenient operation.

Summary of the invention

The continuity that the purpose of this utility model is to provide the preservation and controlling circuit with heat insulation effect preferably and can guarantees to draw water is avoided repetitive operation, after stopping pumping, can recover the locking/relieving circuit of lock-out state in the short period of time.

In order to achieve the above object, the utility model adopts following technical scheme: described electric-heating thermos control circuit comprises energy-saving heat preserving circuit and locking/relieving circuit, it is characterized in that:

Described energy-saving heat preserving control circuit comprises a well heater RL1 to boil water, muff heater RL2 and water temperature testing circuit, two half-wave currents that muff heater RL2 controls alternating current respectively by the diode D5 that is connected in parallel and controllable silicon SCR pass through, and the detection signal of water temperature testing circuit feeds back to gate circuit IC1 and compares the back with the break-make of control controllable silicon SCR and the power on/off of well heater RL1 to boil water;

Described locking/relieving circuit comprises that one drives loop, and controls the release time control circuit of release time and the release delay circuit in parallel with a motor M by capacitor C 4 impulse electricities, the release delay circuit comprises the resistance R 11 and the R12 of two series connection, insert the input end of photoelectrical coupler PC3 between resistance R 11 and the R12, the output terminal of PC3 inserts the positive pole of capacitor C 4.

The present invention reforms prior art, aspect insulation, adopt RL1 well heater to boil water, the RL2 of controlled half-wave work makes muff heater realize the uninterrupted insulation of variable power, because the existence of half-power insulation is arranged, water temperature descends slowly, the chance that enters the total power insulation is little, and power consumption is lower.And control with relay, boiling water is after losing power supply, and it is very fast that water temperature descends, and well heater can enter keeping warm mode continually, and well heater will have enough big power.Because it is longer that near the time of high water temperature (as boiling point) is kept in the existence that has half-power to be incubated, boiling water, more meets and drink needs.And control with relay, boiling water is losing under the thermal source state, is difficult to keep higher water temperature (as near boiling point), when needing the boiling water of higher temperatures, will enable boiling function again, and it is more to consume electric power.

Aspect the control of " locking/releasing ", increase release delay circuit, delay function.Like this, can guarantee on the one hand the continuity of drawing water, avoid repetitive operation (as by the release knob), on the other hand, after stopping pumping, can recover lock-out state in the short period of time.

Description of drawings

Fig. 1 is one of embodiment of existing thermal circuit;

Fig. 2 be existing thermal circuit embodiment two;

Fig. 3 be existing thermal circuit embodiment three;

Fig. 4 is for being the embodiment of existing locking/releasing control circuit;

Fig. 5 is the workflow diagram of energy-saving heat preserving control circuit described in the utility model;

Fig. 6 is the physical circuit figure of control circuit described in the utility model.

Embodiment

Shown in Fig. 5,6, described energy-saving heat preserving control circuit specifically describes as follows:

1) D5 makes hot water obtain the half-power insulation for RL2 provides half-wave current for a long time.

2) diode D6, D7 controllable silicon SCR can be controlled muff heater power by the break-make of control SCR by other half-wave current, RL2 total power insulation when the SCR conducting, and RL2 half-power work when SCR ends, RL2 also provides electric current for going out water passage.

3) break-make of SCR is decided because of water temperature, and RT is the thermistor that is used for checking leaving water temperature, RT, and R14, R15, R35, R36, R37, the 8th, 9,14 pin of D12 and IC2 (LM339) are formed the detecting circuit of water temperature jointly; The 5th, 6,7 pin of R20, R21 and IC1 (LM324) are formed level conversion loop (being equivalent to inverter), output terminal the 7th foot control system photoelectrical coupler PC1; R5, PC1, BG1, R3, R4 form silicon controlled and trigger the loop.When water temperature is higher than set point, the 14 pin output low levels of IC2, the 7 pin output high level of IC1, the PC1 conducting, the BG1 conducting, SCR ends, the work of RL2 half-power; When water temperature is lower than set point, 14 pin of IC2 output high level, the 7 pin output low levels of IC1, PC1 ends, and BG1 ends, SCR conducting, RL2 full power operation.Two design temperature differences of the complete/half-power conversion of this circuit are no more than 1 ℃.

Aspect the control of " locking/releasing " of water outlet, the present invention has carried out good improvement, and its method is: shorten the discharge time of release, add the release timing circuit at the both ends of power of motor.1,2,3,12,13,14 pin of R3, R16, R17, C4, R31, R32, R33, R34 and IC1 are formed the release time control circuit.R7, R8, R9, PC2, R19, BG2 form the driving loop of release " locking/releasing ".K3 is the release knob, and when pressing K3, capacitor C 4 is recharged, and circuit is in released state, and this circuit is controlled the release time by the discharge of C4.Under released state, press water outlet knob K1, the motor M both end voltage raises, the work of release timing circuit, and the electric charge on the C4 is replenished, when stopping pumping, C4 discharges by original degree of discharge again, can draw such conclusion thus: as long as also drawing water, released state will be kept down, as long as stop pumping, will be returned to lock-out state by the release time of setting.

As seen from above, key point of the present utility model is:

1) conversion of insulation power.Promptly when water temperature was higher than setting value, RL2 replenished boiling water dispersed heat when being incubated only by half-wave current with low-power consumption; When water temperature was lower than setting value, RL2 increased more heat to boiling water by full-wave electric current, made that water temperature is unlikely falls too lowly.

2) aspect the control of " locking/releasing ", delay function is arranged.Like this, can guarantee on the one hand the continuity of drawing water, avoid repetitive operation (as by the release knob), on the other hand, after stopping pumping, can recover lock-out state in the short period of time.

Design main points of the present utility model are: A, total power/half-power insulation switch technology; B, usefulness photoelectrical coupler and controllable silicon cooperate the transformation applications technology of control insulation power; C, the release delay technique of controlling with photoelectrical coupler.

Claims (1)

1, the electric-heating thermos control circuit comprises energy-saving heat preserving circuit and locking/relieving circuit, it is characterized in that:

Described energy-saving heat preserving control circuit comprises a well heater RL1 to boil water, muff heater RL2 and water temperature testing circuit, two half-wave currents that muff heater RL2 controls alternating current respectively by the diode D5 that is connected in parallel and controllable silicon SCR pass through, and the detection signal of water temperature testing circuit feeds back to gate circuit IC1 and compares the back with the break-make of control controllable silicon SCR and the power on/off of well heater RL1 to boil water;

Described locking/relieving circuit comprises that one drives loop, and controls the release time control circuit of release time and the release delay circuit in parallel with a motor M by capacitor C 4 impulse electricities, the release delay circuit comprises the resistance R 11 and the R12 of two series connection, insert the input end of photoelectrical coupler PC3 between resistance R 11 and the R12, the output terminal of PC3 inserts the positive pole of capacitor C 4.

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