CN201034383Y - High-fidelity overheating protection circuit for electric water heater - Google Patents

High-fidelity overheating protection circuit for electric water heater Download PDF

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Publication number
CN201034383Y
CN201034383Y CNU200720050141XU CN200720050141U CN201034383Y CN 201034383 Y CN201034383 Y CN 201034383Y CN U200720050141X U CNU200720050141X U CN U200720050141XU CN 200720050141 U CN200720050141 U CN 200720050141U CN 201034383 Y CN201034383 Y CN 201034383Y
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CN
China
Prior art keywords
circuit
relay
comparator
fuse
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CNU200720050141XU
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Chinese (zh)
Inventor
谭文胜
Original Assignee
谭文胜
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Filing date
Publication date
Application filed by 谭文胜 filed Critical 谭文胜
Priority to CNU200720050141XU priority Critical patent/CN201034383Y/en
Application granted granted Critical
Publication of CN201034383Y publication Critical patent/CN201034383Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility mode relates to a high-reliability electric-water-heater-used high-sensitivity overt-temperature-protective circuit. The utility model is characterized in that: a load circuit is series connected to a fuse after being parallel connected to one of the groups of normally open contacts of the relay; a thermocouple which is immersed in the water of the liner is connected to an input end of a comparator; an output end of the comparator is connected to a position between a base of a switch triode and an emitter. The switch triode controls the power supply on-off of the relay coil. When the temperature of the water in the liner is over the preset temperature, the electric pressure produced by the two ends of the thermocouple makes the comparator output level and electrify the switch triode so as to turn on the relay coil power supply to pull in the normally open contacts of the relay, and the load is circuit shortened transiently and the fuse is burned out to realize overt temperature protection.

Description

Electric heater high sensitivity overtemperature prote circuit
Technical field
The present invention relates to the overtemperature prote circuit that a kind of electric heater is used, particularly a kind of electric heater high sensitivity overtemperature prote circuit.
Background technology
Existing electric heater comprises inner bag, shell, electrothermal tube, temperature controller and overtemperature prote device, electrothermal tube heats the water in the inner bag, water temperature reach setting value back temperature controller cut off electrothermal tube power supply so that water temperature be controlled in the range of set temperature, wherein the overtemperature prote device can be the bimetal strip thermostat of disposable overheating fuse or hand-reset, this overtemperature prote device is fixed on inner bladder outer wall and connects with electrothermal tube or main circuit, its effect be when temperature controller malfunctioning and can not cut off the power supply of electric heater and when making the inner bag temperature too high, the overtemperature prote device moves and the power supply of cut-out electrothermal tube or main circuit, and the action of overtemperature prote device is to automatically reset, and promptly must change disposable fuse or manually bimetal strip thermostat resetted; The shortcoming of present this overtemperature prote device is that sensitivity is low; reason is that it is arranged on inner bladder outer wall; the heat of inner bag must be delivered to the overtemperature prote device again through water and wall of inner container; its temperature sensor far lags behind the water temperature of inner bag; if the temperature of its hysteresis is excessive, then can not be up to the effect of overtemperature prote.
Summary of the invention
The objective of the invention is the low problem of sensitivity that exists in the overtemperature prote device that solves existing electric heater, and provide a kind of electric heater with high sensitivity overtemperature prote circuit.
The object of the present invention is achieved like this: a kind of electric heater high sensitivity overtemperature prote circuit; it is characterized in that wherein connecting with fuse again after one group of normally opened contact parallel connection of load circuit and relay; be immersed in the input that thermocouple in the inner bag water connects comparator; the output of comparator is connected between the base stage and emitter stage of switch triode, and this switch triode is controlled the power supply on-off of described relay coil.After the water temperature in the inner bag surpasses design temperature; the voltage that the thermocouple two ends produce makes the comparator output level and the actuating switch triode; thereby the engage relay coil power makes the normally opened contact adhesive of relay, and load is by instantaneous short circuit and with blown fuse, to realize overtemperature prote.
Described electric heater is characterized in that with high sensitivity overtemperature prote circuit described normally opened contact is in series with current-limiting resistance.
Owing to adopted technical solutions according to the invention; the thermocouple that is used for perception inner bag water temperature can directly contact with water; and the reaction speed of thermocouple is fast, highly sensitive; the temperature of thermocouple perception and the lag time of water temperature are little; and the electrical transmission speed of comparator and switch triode is fast; so electric heater of the present invention action sensitivity height of high sensitivity overtemperature prote device; once inner bag temperature overtemperature; engage relay coil and with blown fuse has fast then prevented the electric heater overtemperature and the further danger that causes.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the circuit theory diagrams of electric heater of the present invention with an embodiment of high sensitivity overtemperature prote circuit.
Fig. 2 is the circuit theory diagrams of electric heater of the present invention with another embodiment of high sensitivity overtemperature prote circuit.
F1, fuse among the figure, R1, R2, R3, R4, R5, R6, resistance, U1, comparator, Q1, Q2, switch triode, J, J0, relay, T1, transformer, D1, D2, D3, D4, commutation diode, C1, C2, C3, capacitor, U2, voltage-stablizer, RL1, RL2, electrothermal tube.
The specific embodiment:
Embodiment one, see shown in Figure 1, L, the N two termination 220V AC powers of described electric heater in the high sensitivity overtemperature prote circuit, the part on transformer T1 right side is a regulator rectifier circuit, wherein the model of voltage-stablizer U2 is 7805, the electrothermal tube RL1 of electric heater and the parallel connection of primary windings of transformer T1, the primary coil that is electrothermal tube and transformer T1 is as load circuit, normally opened contact 1 on the relay J and 2 is with in parallel with primary coil and the electrothermal tube RL1 of transformer T1 again after current-limiting resistance R1 connects, and fuse F1 is connected in the main circuit; A, B 2 points in the difference map interlinking of thermocouple two ends.
During normality, electric heater is in normal operating conditions, the undertension that thermocouple produces is so that model is the comparator action of LM393, being the base stage of switch triode Q1---the emitter voltage deficiency is so that the switch triode conducting, the coil blackout of circuit breaker, contact 1 and 2 disconnects, and the elementary and electrothermal tube RL1 of transformer T1 is charged by L, the N connection among fuse F1 and Fig. 1, and electric heater can operate as normal; After the water temperature in the inner bag surpasses setting value; soak the thermocouple that is located in the water and produce enough big voltage; make high level of output output of comparator U1; thereby make switch triode Q1 conducting; the coil of relay J is switched on and contact 1 and 2 is pulled together; the electric current that flows into through the L end fuse F1 that flows through; contact 1 and 2; return the N end behind the current-limiting resistance R1; thereby with L; the 220VAC voltage of the input of N is by instantaneous short circuit; the fuse quick fuse; thereby make load---heat pipe RL1 and transformer T1 outage; electric heater can not be worked, and has realized the overtemperature prote function.
Current-limiting resistance R1 among Fig. 1 also can omit, referring to Fig. 2 embodiment.
Embodiment two, see Fig. 2, and it is before on the basis of Fig. 1 electrothermal tube being connected on fuse F1.Microprocessor among Fig. 2---PU SYSTEM is by the low-tension supply power supply on transformer T1 right side, during normal the use, microprocessor control relay J0 action by gauge tap triode Q2 base current, realize contact 3,4 adhesive or disconnection, make comparator U1 output high level and make switch triode Q1 conducting after water temperature in the inner bag surpasses setting value when thermocouple detects, the relay J adhesive, contact 1 and 2 is connected, fuse F1 is fused, transformer T1 outage, microprocessor---PU SYSTEM also cuts off the power supply, thereby relay J 0 can not adhesive and made the electrothermal tube RL2 work of can not switching on; In fact circuit among Fig. 2 has two loads---and first load is the control circuit of the low-pressure section on transformer and right side thereof, second load is electrothermal tube RL2, wherein first load is connected on after the fuse F1, and second load is connected on before the fuse F1, and second load is subjected to first load control, so can realize purpose of the present invention equally.

Claims (2)

1. an electric heater is with high sensitivity overtemperature prote circuit; it is characterized in that wherein connecting with fuse again after one group of normally opened contact parallel connection of load circuit and relay; be immersed in the input that thermocouple in the inner bag water connects comparator; the output of comparator is connected between the base stage and emitter stage of switch triode, and this switch triode is controlled the power supply on-off of described relay coil.
2. according to the described electric heater of claim 1 high sensitivity overtemperature prote circuit, it is characterized in that described normally opened contact is in series with current-limiting resistance.
CNU200720050141XU 2007-04-09 2007-04-09 High-fidelity overheating protection circuit for electric water heater Expired - Fee Related CN201034383Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNU200720050141XU CN201034383Y (en) 2007-04-09 2007-04-09 High-fidelity overheating protection circuit for electric water heater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU200720050141XU CN201034383Y (en) 2007-04-09 2007-04-09 High-fidelity overheating protection circuit for electric water heater

Publications (1)

Publication Number Publication Date
CN201034383Y true CN201034383Y (en) 2008-03-12

Family

ID=39195273

Family Applications (1)

Application Number Title Priority Date Filing Date
CNU200720050141XU Expired - Fee Related CN201034383Y (en) 2007-04-09 2007-04-09 High-fidelity overheating protection circuit for electric water heater

Country Status (1)

Country Link
CN (1) CN201034383Y (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104143814A (en) * 2013-05-10 2014-11-12 苏州普源精电科技有限公司 Linear direct-current power source and measuring device
CN104571196A (en) * 2014-03-04 2015-04-29 湖南新韶光电器有限公司 Time and temperature controllable electric heating pipe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104143814A (en) * 2013-05-10 2014-11-12 苏州普源精电科技有限公司 Linear direct-current power source and measuring device
CN104571196A (en) * 2014-03-04 2015-04-29 湖南新韶光电器有限公司 Time and temperature controllable electric heating pipe

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C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20080312

Termination date: 20100409