CN2318787Y

CN2318787Y - Multifunction temp. controller for electric blanket

Info

Publication number: CN2318787Y
Application number: CN 97251001
Authority: CN
Inventors: 玄哲雄
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-11-27
Filing date: 1997-11-27
Publication date: 1999-05-12
Anticipated expiration: 2007-11-27

Abstract

The utility model discloses a multifunction temperature controller for electric blankets. The utility model is additionally provided with a temperature sample circuit taking thermosensitive resistors Rt 1 and Rt 2 as a temperature sensor and a safety protecting circuit on the basis of being composed of a voltage stabilizing circuit, a comparison amplification circuit, a pulse forming circuit and a work executing circuit, and thereby, the purposes of automatic temperature control, constant temperature and working temperature automatically compensated by environment temperature. And simultaneously, the utility model has the advantages of security protection, stable performance, high sensitivity, low cost, simple circuits and safety and durability.

Description

Electric blanket multifunctional temperature control device

The utility model relates to a kind of electric blanket multifunctional temperature control device.

The temperature control electric blanket device that at present general family uses does not all have the automatic constant-temperature controlled function, temperature that can only armrest industry control system electric blanket, its design feature is formed third gear by toggle switch, and one grade is the high temperature shelves, be that civil power directly is connected on the heating wire of electric blanket, its full power operation is heated up; One grade is the low temperature shelves, and civil power makes the work of heating wire small-power heat up after halfwave rectifier; One grade promptly stops energising for the pass is out of stock and heats; though this temperature control electric blanket device is simple in structure; volume is little; cost is low; but need artificial control temperature; there is not safety guard again; toggle switch with the disadvantages affect that can cause loose contact long afterwards its useful life and performance; for addressing this problem; the temperature control electric blanket device that has utilizes temperature sensor that the measurement of heating wire temperature is compared with the temperature of setting; control bidirectional triode thyristor by amplifier output control pulse signal and reach the temperature of automatic control heating wire with this; this kind temperature control electric blanket utensil has had the function of automatic constant-temperature; but complex circuit; the cost height; lack safety guard, and do not have any contact with the variation of ambient temperature.

The purpose of this utility model provides a kind of temperature control electric blanket device, has automatic temperature-control, constant temperature, working temperature by the multifunctional characteristics that ambient temperature compensates automatically, has the safety protective circuit device simultaneously.

The purpose of this utility model is achieved through the following technical solutions:

Electric blanket multifunctional temperature control device; by regulator rectifier circuit; compare amplifying circuit; pulse shaping circuit; the execution work circuit is formed; in comparing amplifying circuit, increase and be provided with temperature sampling circuit; wherein by thermistor Rt1; the environment temperature sensor that resistance R 4 back series resistance R3 in parallel form; the working temperature transducer of forming by thermistor Rt2; after environment temperature sensor and working temperature transducer are in parallel; series resistance R2 constitutes temperature sampling circuit again; be connected in parallel on the output of regulator rectifier circuit; by resistance R 12; diode D5; D6; triode T1; resistance R 13; capacitor C 3; controllable silicon SCR 2; the safety protective circuit that light-emitting diode D7 connects to form, sample resistance R12 wherein are connected between the load heating wire RL and bidirectional triode thyristor SCR1 in the execution work circuit.Its operation principle: K closes a switch, civil power is through diode D1, resistance R 1, capacitor C 1, the regulator rectifier circuit that voltage stabilizing didoe Dw forms changes the 20V direct current into as power supply, thermistor Rt1 and monitoring of environmental temperature after R4 is in parallel, ambient temperature range is between 5 ℃-35 ℃, thermistor Rt1 both end voltage value is a linear change, thermistor Rt2 monitoring temperature, resistance R 5, R6, R7 and potentiometer W form temperature setting circuit, temperature setting circuit and temperature sampling circuit, amplifier A1, resistance R 8 common constituent ratios are than amplifying circuit, be limited to 60 ℃ on the design temperature, be limited to 30 ℃ down.When working temperature is lower than design temperature when (amplifier A1 input negative terminal voltage is higher than positive terminal voltage), amplifier A1 output low level, amplifier A2 output pulse signal triggers bidirectional triode thyristor SCR1 conducting through capacitor C 2, diode D2, D3, and load heating wire RL gets electric intensification; When working temperature rose to design temperature, amplifier A1 exported high level, and amplifier A2 output low level is pulse-free signal output, and bidirectional triode thyristor SCR1 is by powering to load heating wire RL; When working temperature is brought down below design temperature, amplifier A1 output low level, amplifier A2 output pulse signal triggers bidirectional triode thyristor SCR1 conducting, and load heating wire RL gets electric intensification, and the working temperature of heating wire is controlled on the design temperature all the time and so forth.When ambient temperature descended, thermistor Rt1 was as temperature compensator, and Rt1 resistance increases, electric current reduces, then thermistor Rt2 both end voltage increases, on the contrary the decline of thermistor R2 both end voltage, and load heating wire RL working end obtains the automatic compensation of variation of ambient temperature like this.Open circuit when load heating wire RL inside has, when faults such as short circuit, arcing take place, its voltage signal is passed to triode T1 through resistance R 12, diode D5 and is amplified, trigger controllable silicon SCR 2 conductings through capacitor C 3 again, light-emitting diode D7 demonstrates fault, amplifier A quits work because of supply voltage is lower than operating voltage simultaneously, thereby reached the power supply of control load heating wire RL, till after repairing, restarting.

The utility model has rationally utilized the characteristic of thermistor, be provided with two temperature sensors, a thermistor Rt1 monitoring of environmental temperature, another thermistor Rt2 monitoring temperature (working temperature is set by potentiometer W step-less adjustment) has reached temperature adjustment, automatic constant-temperature and working temperature by the self-compensating purpose of ambient temperature with this.Be provided with safety protective circuit owing to increase again, when the inner arbitrary element of electric blanket breaks down, power supply that can both control load electricity silk RL, and indicate fault by light-emitting diode D7.Adopt the bidirectional triode thyristor zero cross fired in addition, quick heating, non-impact current.The utility model has also that volume is little, circuit is simple, easy to operate, stable performance, highly sensitive, cost is low, the characteristics of safety durable.

Below in conjunction with accompanying drawing embodiment is described as follows:

Fig. 1 is a circuit working schematic diagram of the present utility model.

With reference to Fig. 1, diode D1, resistance R 1, capacitor C 1, voltage stabilizing didoe Dw form regulator rectifier circuit.Thermistor Rt1, resistance R 4 back in parallel and resistance R 3 be composed in series the working temperature transducer of environment temperature sensor and thermistor Rt2 composition in parallel after, series resistance R2 constitutes temperature sampling circuit again, be connected in parallel on the output of regulator rectifier circuit, thermistor Rt1, Rt2 adopts subzero temperature series thermistor, temperature setting circuit is by resistance R 5, R6, R7 and potentiometer W form, relatively amplifying circuit is by amplifier A1, resistance R 8, temperature sampling circuit and temperature setting circuit are formed jointly, and amplifier A1 compares and enlarges the voltage signal of design temperature and working temperature.Pulse shaping circuit is made up of resistance R 9, R10, amplifier A2, and amplifier A1, A2 adopt double operational LM358.By capacitor C 2, diode D2, D3, D4; resistance R 11, bidirectional triode thyristor SCR1 and load heating wire RL form the execution work circuit; light-emitting diode D3 is the indication red light of heating; light-emitting diode D4 is a constant temperature indication green light; by resistance R 12, diode D5, D6; the safety protective circuit that triode T1, resistance R 13, capacitor C 3, controllable silicon SCR 2, light-emitting diode D7 connect to form; sample resistance R12 wherein is connected between the load heating wire RL and bidirectional triode thyristor SCR1 in the execution work circuit, and light-emitting diode D7 is the faulty indication red light.Form AC power line by K switch, light-emitting diode D8, resistance R 14, light-emitting diode D8 is a power supply indication red light.

Claims

1, a kind of electric blanket multifunctional temperature control device, by regulator rectifier circuit, comparison amplifying circuit, pulse shaping circuit, the execution work circuit is formed, and it is characterized in that:

A, the environment temperature sensor of forming by thermistor Rt1, resistance R 4 back series resistance R3 in parallel, the working temperature transducer of forming by thermistor Rt2, after environment temperature sensor and working temperature transducer are in parallel, series resistance R2 constitutes temperature sampling circuit again, be connected in parallel on the output of regulator rectifier circuit

B, by resistance R 12, diode D5, D6; the safety protective circuit that triode T1, resistance R 13, capacitor C 3, controllable silicon SCR 2, light-emitting diode D7 connect to form, sample resistance R12 wherein are connected between the load heating wire RL and bidirectional triode thyristor SCR1 in the execution work circuit.