CN105652921A - Thermostatic control apparatus with self-protection and over-limit alarm - Google Patents

Thermostatic control apparatus with self-protection and over-limit alarm Download PDF

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Publication number
CN105652921A
CN105652921A CN201510772967.6A CN201510772967A CN105652921A CN 105652921 A CN105652921 A CN 105652921A CN 201510772967 A CN201510772967 A CN 201510772967A CN 105652921 A CN105652921 A CN 105652921A
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circuit
selects
resistor
protection
temperature
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胡万顺
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Wuhu Hengfeng Technology Co Ltd
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Wuhu Hengfeng Technology Co Ltd
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Abstract

The invention discloses a thermostatic control apparatus with self-protection and over-limit alarm. The apparatus comprises a power supply circuit, a temperature detection amplification circuit, a sawtooth wave generator, a pulse width control circuit, a comparison amplification circuit, a control execution circuit, a temperature indication circuit, an over-temperature protection circuit and a sound and light alarm circuit. The power supply circuit is formed by a power transformer T, a rectifier bridge pile UR, filtering capacitors C5-C7 and three-terminal voltage stabilization integration circuits IC1 and IC7. The temperature detection amplification circuit is formed by a temperature sensor integration circuit IC2, resistors R4-R6, an N1 in an operational amplifier IC6, capacitors C1 and C2 and an inductor L. The sawtooth wave generator is formed by a time-base integrated circuit IC3, diodes VD1 and VD2, resistors R7-R9, a transistor V6 and capacitor C3 and C4. The control apparatus of the invention adopts a pulse width modulation technology to carry out temperature control, possesses digital temperature display, over-temperature alarm and automatic protection functions, controls two loads and keeps a temperature of a controlled place to be a temperature in a range from 25 DEG C to 42 DEG C.

Description

A kind of band is from the thermostatically-controlled equipment of protection and overload alarm
Technical field
The invention belongs to technical field of automatic control, it is specifically related to a kind of band from the thermostatically-controlled equipment of protection and overload alarm.
Background technology
Traditional temperature acquisition and warning circuit layout adopt positive-negative power supply track to track discharge circuit to realize conversion and the warning circuit of temperature, and its circuit more complicated and the negative voltage exported are unfavorable for the direct collection of A/D converter; Also having now the method directly adopting software processes, by microcontroller acquires temperature data, temperature data is carried out process and reports to the police by software algorithm, this kind of Measures compare is simple, but reliability is not high, when microprocessor breaks down, whole warning just can not normal operation.
Summary of the invention
Goal of the invention: it is an object of the invention to solve deficiency of the prior art; there is provided a kind of and adopt pulse modulation technology temperature control; having digital temperature display, overtemperature alarm and automatic protection functions, the band of control two-way load is from the thermostatically-controlled equipment of protection and overload alarm.
Technical scheme: a kind of thermostatically-controlled equipment being with protection and overload alarm certainly of the present invention, comprises power source circuit, temperature detection amplification circuit, sawtooth-wave generator, pulse width control circuit, compares amplification circuit, controls execution circuit, temperature indicator circuit, Overtemperature protection circuit harmony, optical alarm circuit; Described power source circuit is made up of supply transformer T, rectification bridge heap UR, filter condenser C5��C7 and circuit of three-terminal voltage-stabilizing integrated IC1 and IC7, the output terminal of described supply transformer T is connected with rectification bridge heap UR, the output terminal of described rectification bridge heap UR is connected to filter condenser C7 and the input terminus of circuit of three-terminal voltage-stabilizing integrated IC7, the output terminal of described circuit of three-terminal voltage-stabilizing integrated IC7 is connected to filter condenser C6 and the input terminus of circuit of three-terminal voltage-stabilizing integrated IC1, and the output terminal of described circuit of three-terminal voltage-stabilizing integrated IC1 is connected with filter condenser C5; Described temperature detection is amplified circuit and is made up of the N1 of temperature sensor integrated circuit (IC) 2, resistor R4��R6, operational amplifier IC6 inside, electrical condenser C1, C2 and inducer L, the output terminal of described temperature sensor integrated circuit (IC) 2 is connected to electrical condenser C1, inducer L, described inducer L is also connected with the positive pole of N1 by resistor R4, the negative pole of described N1 is connected in parallel to resistor R5, R6, the output terminal of described resistor R6 and N1 connects, and described filter condenser C5 is also connected with resistor R3, R2 and electrical condenser C2;Described sawtooth-wave generator is by time-base integrated circuit IC3, diode VD1, VD2, resistor R7��R9, transistor V6 and electrical condenser C3, C4 forms, 7 pin of described time-base integrated circuit IC3 are connected with the collector electrode of transistor V6 by resistor R7, the emtting electrode of described transistor V6 is connected with resistor R8, the base stage of described transistor V6 is connected to the diode VD1 of series connection, VD2 and resistor R9, the collector electrode of described transistor V6 is also connected with 2 pin of time-base integrated circuit IC3, 6 pin and electrical condenser C4, described electrical condenser C4 is connected with 5 pin of described time-base integrated circuit IC3 by electrical condenser C3, described pulse width control circuit is made up of the operational amplifier N2 of IC6 inside and potentiometer RP3, the positive pole of described operational amplifier N2 is connected with 2 pin, 6 pin of described time-base integrated circuit IC3, and the negative pole of described operational amplifier N2 is connected with 1 pin, the electrical condenser C3 and electrical condenser C4 of described time-base integrated circuit IC3 by potentiometer RP3, described comparison amplifies circuit by the accurate voltage stabilizing integrated circuit (IC) 4 of three ends, resistor R1, R10, R11, the operational amplifier N3 of IC6 inside, N4 and potentiometer RP1, RP2 forms, the power supply end of the accurate voltage stabilizing integrated circuit (IC) 4 of described three ends is connected with power supply by resistance R1, the control end of the accurate voltage stabilizing integrated circuit (IC) 4 of described three ends is connected in parallel to resistor R10, R11, described resistor R10 is also connected in parallel to potentiometer RP1, RP2, described potentiometer RP1 is connected with the positive pole of the operational amplifier N3 of IC6 inside, described potentiometer RP2 is connected with the positive pole of described operational amplifier N4, described operational amplifier N3, the negative pole of N4 is connected with the output terminal of N1 simultaneously, described control performs circuit and is made up of resistor R13��R15, R18��R22, transistor V1, V2, opticcoupler VLC1, VLC2 and thyristor VT1, VT2, described temperature indicator circuit is made up of digital voltmeter (DVM), resistor R2, R3 and electrical condenser C5, described Overtemperature protection circuit is made up of resistor R17, R23, transistor V3, V4, diode VD3 and relay K, and described sound, optical alarm circuit are made up of three end dual color light emitting diode VL3, resistor R16, R12, Zener diode VS, transistor V5, music integrated circuit IC5 and loud speaker BL.
Further, described resistor R1��R23 selects l/4W metalster or carbon film resistor.
Further, described potentiometer RP1��RP3 selects small-sized solid potentiometer or variohm.
Further, described electrical condenser C1 and C3 all selects monolithic capacitor; C2, C4 ~ C6 all selects withstand voltage to be the aluminium electrolutic capacitor of 16V; C7 selects withstand voltage to be the aluminium electrolutic capacitor of 25V.
Further, described diode VD1, VD2 select 1N4148 type silicon switching diode; VD3 selects 1N4007 type silicon rectifier diode.
Further, described photodiode VL1 and VL2 all selects the high brightness LED of �� 3mm; VL3 selects 2EF302 type three end photodiode.
Further, described VS selects the silicon Zener diode of l/2W, 3.9V.
Further, described transistor V1, V2, V4 and V5 select S8050 or C8050 type silicon NPN transistor; V3 selects 59013 type silicon NPN crystal. pipe; Y6 selects 59011 type silicon PNP transistor.
Further, described IC1 selects LM78L05 type circuit of three-terminal voltage-stabilizing integrated; IC2 selects LM35D type temperature sensor unicircuit; IC3 selects NE555 type time-base integrated circuit;IC4 selects the accurate voltage stabilizing unicircuit of TL431 or pA431 type three end; IC5 selects the alarm sound efficient integrated circuit of the models such as KD9561; IC6 selects LM324 type four high guaily unit unicircuit; IC7 selects LM7809 type circuit of three-terminal voltage-stabilizing integrated.
Further, described VLC1 and VLC2 all selects M0C3061 type opticcoupler.
Useful effect: the control device of the present invention adopts pulse modulation technology temperature control, has digital temperature display, overtemperature alarm and automatic protection functions, control two-way load, makes controlled location homo(io)thermism be within the scope of 25��42 DEG C on a certain temperature value.
Accompanying drawing explanation
Fig. 1 is the circuit principle structure figure of the present invention.
Embodiment
A kind of thermostatically-controlled equipment being with protection and overload alarm certainly as shown in Figure 1, comprises power source circuit, temperature detection amplification circuit, sawtooth-wave generator, pulse width control circuit, compares amplification circuit, controls execution circuit, temperature indicator circuit, Overtemperature protection circuit harmony, optical alarm circuit.
Described power source circuit is made up of supply transformer T, rectification bridge heap UR, filter condenser C5��C7 and circuit of three-terminal voltage-stabilizing integrated IC1 and IC7, the output terminal of described supply transformer T is connected with rectification bridge heap UR, the output terminal of described rectification bridge heap UR is connected to filter condenser C7 and the input terminus of circuit of three-terminal voltage-stabilizing integrated IC7, the output terminal of described circuit of three-terminal voltage-stabilizing integrated IC7 is connected to filter condenser C6 and the input terminus of circuit of three-terminal voltage-stabilizing integrated IC1, and the output terminal of described circuit of three-terminal voltage-stabilizing integrated IC1 is connected with filter condenser C5.
Described temperature detection is amplified circuit and is made up of the N1 of temperature sensor integrated circuit (IC) 2, resistor R4��R6, operational amplifier IC6 inside, electrical condenser C1, C2 and inducer L, the output terminal of described temperature sensor integrated circuit (IC) 2 is connected to electrical condenser C1, inducer L, described inducer L is also connected with the positive pole of N1 by resistor R4, the negative pole of described N1 is connected in parallel to resistor R5, R6, the output terminal of described resistor R6 and N1 connects, and described filter condenser C5 is also connected with resistor R3, R2 and electrical condenser C2.
Described sawtooth-wave generator is by time-base integrated circuit IC3, diode VD1, VD2, resistor R7��R9, transistor V6 and electrical condenser C3, C4 forms, 7 pin of described time-base integrated circuit IC3 are connected with the collector electrode of transistor V6 by resistor R7, the emtting electrode of described transistor V6 is connected with resistor R8, the base stage of described transistor V6 is connected to the diode VD1 of series connection, VD2 and resistor R9, the collector electrode of described transistor V6 is also connected with 2 pin of time-base integrated circuit IC3, 6 pin and electrical condenser C4, described electrical condenser C4 is connected with 5 pin of described time-base integrated circuit IC3 by electrical condenser C3.
Described pulse width control circuit is made up of the operational amplifier N2 of IC6 inside and potentiometer RP3, the positive pole of described operational amplifier N2 is connected with 2 pin, 6 pin of described time-base integrated circuit IC3, and the negative pole of described operational amplifier N2 is connected with 1 pin, the electrical condenser C3 and electrical condenser C4 of described time-base integrated circuit IC3 by potentiometer RP3.
Described comparison amplifies circuit by the accurate voltage stabilizing integrated circuit (IC) 4 of three ends, resistor R1, R10, R11, the operational amplifier N3 of IC6 inside, N4 and potentiometer RP1, RP2 forms, the power supply end of the accurate voltage stabilizing integrated circuit (IC) 4 of described three ends is connected with power supply by resistance R1, the control end of the accurate voltage stabilizing integrated circuit (IC) 4 of described three ends is connected in parallel to resistor R10, R11, described resistor R10 is also connected in parallel to potentiometer RP1, RP2, described potentiometer RP1 is connected with the positive pole of the operational amplifier N3 of IC6 inside, described potentiometer RP2 is connected with the positive pole of described operational amplifier N4, described operational amplifier N3, the negative pole of N4 is connected with the output terminal of N1 simultaneously.
Described control performs circuit and is made up of resistor R13��R15, R18��R22, transistor V1, V2, opticcoupler VLC1, VLC2 and thyristor VT1, VT2; Described temperature indicator circuit is made up of digital voltmeter (DVM), resistor R2, R3 and electrical condenser C5; described Overtemperature protection circuit is made up of resistor R17, R23, transistor V3, V4, diode VD3 and relay K, and described sound, optical alarm circuit are made up of three end dual color light emitting diode VL3, resistor R16, R12, Zener diode VS, transistor V5, music integrated circuit IC5 and loud speaker BL.
The components and parts of foregoing circuit are selected as follows:
Further, described resistor R1��R23 selects l/4W metalster or carbon film resistor.
Further, described potentiometer RP1��RP3 selects small-sized solid potentiometer or variohm.
Further, described electrical condenser C1 and C3 all selects monolithic capacitor; C2, C4 ~ C6 all selects withstand voltage to be the aluminium electrolutic capacitor of 16V; C7 selects withstand voltage to be the aluminium electrolutic capacitor of 25V.
Further, described diode VD1, VD2 select 1N4148 type silicon switching diode; VD3 selects 1N4007 type silicon rectifier diode.
Further, described photodiode VL1 and VL2 all selects the high brightness LED of �� 3mm; VL3 selects 2EF302 type three end photodiode.
Further, described VS selects the silicon Zener diode of l/2W, 3.9V.
Further, described transistor V1, V2, V4 and V5 select S8050 or C8050 type silicon NPN transistor; V3 selects 59013 type silicon NPN crystal. pipe; Y6 selects 59011 type silicon PNP transistor.
Further, described IC1 selects LM78L05 type circuit of three-terminal voltage-stabilizing integrated; IC2 selects LM35D type temperature sensor unicircuit; IC3 selects NE555 type time-base integrated circuit; IC4 selects the accurate voltage stabilizing unicircuit of TL431 or pA431 type three end; IC5 selects the alarm sound efficient integrated circuit of the models such as KD9561; IC6 selects LM324 type four high guaily unit unicircuit; IC7 selects LM7809 type circuit of three-terminal voltage-stabilizing integrated.
Further, described VLC1 and VLC2 all selects M0C3061 type opticcoupler.
The principle of work of this control device is as follows:
Alternating current 220V voltage, after T step-down, UR rectification, C7 filtering and IC7 voltage stabilizing, for sawtooth-wave generator, pulse width control circuit, compares and amplifies circuit, control execution circuit and Overtemperature protection circuit offer+9V operating voltage. Now V4 saturation conduction, K is energized adhesive, and its normal open contact is connected. + 9V voltage is also+5V through IC1 secondary pressure, as the working power of IC2 and digital voltmeter (DVM).
IC2 converts the temperature information detected to voltage signal, and this signal is after C1, L and C2 filtering, and digital voltmeter (DVM) is delivered in a road after R2 and R3 dividing potential drop, demonstrates temperature value by digital voltmeter (DVM); Another road through operational amplifier N1 amplify after, as the sampling voltage of operational amplifier N2��N4. Positive input end and the anti-phase input end of N4 that IC4 and RI, RIO, R11, RP1, RP2 are N3 provide votage reference.
After sawtooth-wave generator oscillatory work, generation peak value is 6V, paddy value is 3V zigzag wave sawtooth pulse voltage signal, adds to operational amplifier N2 positive input end, and the voltage signal (proportional with temperature variation) of input end anti-phase with it compares. When N2 positive input end's voltage is higher than anti-phase input end's voltage, N2 exports high level, makes V1 conducting, the photodiode of VL2 and VLC1 inside is lighted, the light-operated Jing Jianguan city electricity zero passage district conducting of VLC1 inside, makes VT1 be triggered and conducting, and main electricradiator EH1 energising starts to heat.
Along with the rising of constant temperature the temperature inside the box, the output voltage of operational amplifier Nl starts to increase, and the anti-phase input end's voltage of N2 is also increased, exports the time decreased of high level in a sawtooth pulse voltage cycle, and EH1 reduces conduction time, and the speed of intensification weakens. The anti-phase input end's voltage of N2 is made to be greater than 6V(and the peak value of sawtooth pulse voltage when temperature raises) time, in whole sawtooth pulse voltage cycle, N2 exports lower level always, and ELI stops heating, and temperature no longer rises. When temperature slightly declines, N2 exports again high level, and EH1 starts to heat again. So go round and begin again, make on temperature value that homo(io)thermism sets at RP2.
Operational amplifier N3 and N4 is connected into window comparer. When just starting to heat, owing to constant temperature the temperature inside the box is too low, N3 exports high level lower than the votage reference of its positive input end because of the sampling voltage of inverting input, the green LED of VL3 inside is lighted, IC5 works, its warning electrical signal exported, after 1l5 amplifies, drives BI, sends warning sound; V2 conducting simultaneously, the photodiode of VL1 and VLC2 inside is lighted, and the optocoupler crystalline substance of YLC2 inside asks pipe conducting, and VT2 is triggered and conducting, secondary electricradiator EH2 electrified regulation. Now, main electricradiator EH1 and secondary electricradiator EH2 heats simultaneously, makes constant temperature the temperature inside the box rapid rise, thus shortens warm-up time.
If when when certain component damage such as N2, VI, VLC, VT1 (such as temperature sensing circuit out of control or) makes the top temperature limits value that constant temperature the temperature inside the box sets more than RP2 for a certain reason, operational amplifier N4 will export high level, the red light emitting diodes of VL3 inside is lighted, IC5 works, and BL sends warning sound; V3 conducting simultaneously, makes V4 end, and K power-off discharges, and its normal open contact disconnects, EH1 and EH2 power-off stopping work.
Change the resistance of R8, the sawtooth pulse voltage cycle (being generally 1��10s) that sawtooth-wave generator exports can be changed.
The control device of the present invention adopts pulse modulation technology temperature control, has digital temperature display, overtemperature alarm and automatic protection functions, control two-way load, makes controlled location homo(io)thermism be within the scope of 25��42 DEG C on a certain temperature value.
The above, it it is only the better embodiment of the present invention, not the present invention is done any restriction in form, although the present invention discloses as above with better embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or it is modified to the equivalent embodiment of equivalent variations, in every case it is the content not departing from technical solution of the present invention, the any simple modification above embodiment done according to the technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.

Claims (10)

1. it is with the thermostatically-controlled equipment from protection and overload alarm for one kind, it is characterised in that: comprise power source circuit, temperature detection amplification circuit, sawtooth-wave generator, pulse width control circuit, compare amplification circuit, control to perform circuit, temperature indicator circuit, Overtemperature protection circuit harmony, optical alarm circuit; Described power source circuit is made up of supply transformer T, rectification bridge heap UR, filter condenser C5��C7 and circuit of three-terminal voltage-stabilizing integrated IC1 and IC7, the output terminal of described supply transformer T is connected with rectification bridge heap UR, the output terminal of described rectification bridge heap UR is connected to filter condenser C7 and the input terminus of circuit of three-terminal voltage-stabilizing integrated IC7, the output terminal of described circuit of three-terminal voltage-stabilizing integrated IC7 is connected to filter condenser C6 and the input terminus of circuit of three-terminal voltage-stabilizing integrated IC1, and the output terminal of described circuit of three-terminal voltage-stabilizing integrated IC1 is connected with filter condenser C5;Described temperature detection is amplified circuit and is made up of the N1 of temperature sensor integrated circuit (IC) 2, resistor R4��R6, operational amplifier IC6 inside, electrical condenser C1, C2 and inducer L, the output terminal of described temperature sensor integrated circuit (IC) 2 is connected to electrical condenser C1, inducer L, described inducer L is also connected with the positive pole of N1 by resistor R4, the negative pole of described N1 is connected in parallel to resistor R5, R6, the output terminal of described resistor R6 and N1 connects, and described filter condenser C5 is also connected with resistor R3, R2 and electrical condenser C2, described sawtooth-wave generator is by time-base integrated circuit IC3, diode VD1, VD2, resistor R7��R9, transistor V6 and electrical condenser C3, C4 forms, 7 pin of described time-base integrated circuit IC3 are connected with the collector electrode of transistor V6 by resistor R7, the emtting electrode of described transistor V6 is connected with resistor R8, the base stage of described transistor V6 is connected to the diode VD1 of series connection, VD2 and resistor R9, the collector electrode of described transistor V6 is also connected with 2 pin of time-base integrated circuit IC3, 6 pin and electrical condenser C4, described electrical condenser C4 is connected with 5 pin of described time-base integrated circuit IC3 by electrical condenser C3, described pulse width control circuit is made up of the operational amplifier N2 of IC6 inside and potentiometer RP3, the positive pole of described operational amplifier N2 is connected with 2 pin, 6 pin of described time-base integrated circuit IC3, and the negative pole of described operational amplifier N2 is connected with 1 pin, the electrical condenser C3 and electrical condenser C4 of described time-base integrated circuit IC3 by potentiometer RP3, described comparison amplifies circuit by the accurate voltage stabilizing integrated circuit (IC) 4 of three ends, resistor R1, R10, R11, the operational amplifier N3 of IC6 inside, N4 and potentiometer RP1, RP2 forms, the power supply end of the accurate voltage stabilizing integrated circuit (IC) 4 of described three ends is connected with power supply by resistance R1, the control end of the accurate voltage stabilizing integrated circuit (IC) 4 of described three ends is connected in parallel to resistor R10, R11, described resistor R10 is also connected in parallel to potentiometer RP1, RP2, described potentiometer RP1 is connected with the positive pole of the operational amplifier N3 of IC6 inside, described potentiometer RP2 is connected with the positive pole of described operational amplifier N4, described operational amplifier N3, the negative pole of N4 is connected with the output terminal of N1 simultaneously, described control performs circuit and is made up of resistor R13��R15, R18��R22, transistor V1, V2, opticcoupler VLC1, VLC2 and thyristor VT1, VT2, described temperature indicator circuit is made up of digital voltmeter (DVM), resistor R2, R3 and electrical condenser C5, described Overtemperature protection circuit is made up of resistor R17, R23, transistor V3, V4, diode VD3 and relay K, and described sound, optical alarm circuit are made up of three end dual color light emitting diode VL3, resistor R16, R12, Zener diode VS, transistor V5, music integrated circuit IC5 and loud speaker BL.
2. a kind of band according to claim 1 is from the thermostatically-controlled equipment of protection and overload alarm, it is characterised in that: described resistor R1��R23 selects l/4W metalster or carbon film resistor.
3. a kind of band according to claim 1 is from the thermostatically-controlled equipment of protection and overload alarm, it is characterised in that: described potentiometer RP1��RP3 selects small-sized solid potentiometer or variohm.
4. a kind of band according to claim 1 is from the thermostatically-controlled equipment of protection and overload alarm, it is characterised in that: described electrical condenser C1 and C3 all selects monolithic capacitor; C2, C4 ~ C6 all selects withstand voltage to be the aluminium electrolutic capacitor of 16V;C7 selects withstand voltage to be the aluminium electrolutic capacitor of 25V.
5. a kind of band according to claim 1 is from the thermostatically-controlled equipment of protection and overload alarm, it is characterised in that: described diode VD1, VD2 select 1N4148 type silicon switching diode; VD3 selects 1N4007 type silicon rectifier diode.
6. a kind of band according to claim 1 is from the thermostatically-controlled equipment of protection and overload alarm, it is characterised in that: described photodiode VL1 and VL2 all selects the high brightness LED of �� 3mm; VL3 selects 2EF302 type three end photodiode.
7. a kind of band according to claim 1 is from the thermostatically-controlled equipment of protection and overload alarm, it is characterised in that: described VS selects the silicon Zener diode of l/2W, 3.9V.
8. a kind of band according to claim 1 is from the thermostatically-controlled equipment of protection and overload alarm, it is characterised in that: described transistor V1, V2, V4 and V5 select S8050 or C8050 type silicon NPN transistor; V3 selects 59013 type silicon NPN crystal. pipe; Y6 selects 59011 type silicon PNP transistor.
9. a kind of band according to claim 1 is from the thermostatically-controlled equipment of protection and overload alarm, it is characterised in that: described IC1 selects LM78L05 type circuit of three-terminal voltage-stabilizing integrated; IC2 selects LM35D type temperature sensor unicircuit; IC3 selects NE555 type time-base integrated circuit; IC4 selects the accurate voltage stabilizing unicircuit of TL431 or pA431 type three end; IC5 selects the alarm sound efficient integrated circuit of the models such as KD9561; IC6 selects LM324 type four high guaily unit unicircuit; IC7 selects LM7809 type circuit of three-terminal voltage-stabilizing integrated.
10. a kind of band according to claim 1 is from the thermostatically-controlled equipment of protection and overload alarm, it is characterised in that: described VLC1 and VLC2 all selects M0C3061 type opticcoupler.
CN201510772967.6A 2015-11-13 2015-11-13 Thermostatic control apparatus with self-protection and over-limit alarm Pending CN105652921A (en)

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CN113194555A (en) * 2021-04-22 2021-07-30 杭州电子科技大学 Zero-crossing power adjustment type electric heating drive control circuit based on analog quantity instruction

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CN107800414A (en) * 2016-09-06 2018-03-13 英飞凌科技奥地利有限公司 Switching device and the method for controlling switch
CN107390748A (en) * 2017-08-03 2017-11-24 过成康 A kind of automatic constant temperature control circuit with self-protection function
CN107357339A (en) * 2017-08-18 2017-11-17 过成康 A kind of automation temperature adjustment control circuit with multi-gear adjustment
CN107687903A (en) * 2017-08-18 2018-02-13 过成康 A kind of high-precision temperature automatic detection and alarming device
CN110190730A (en) * 2019-06-26 2019-08-30 江苏江淮动力有限公司 A kind of generating set frequency converter
CN110190730B (en) * 2019-06-26 2020-03-20 江苏江淮动力有限公司 Frequency converter for generator set
CN113194555A (en) * 2021-04-22 2021-07-30 杭州电子科技大学 Zero-crossing power adjustment type electric heating drive control circuit based on analog quantity instruction

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