CN104460763B - Constant-temperature control switching circuit - Google Patents
Constant-temperature control switching circuit Download PDFInfo
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- CN104460763B CN104460763B CN201410762482.4A CN201410762482A CN104460763B CN 104460763 B CN104460763 B CN 104460763B CN 201410762482 A CN201410762482 A CN 201410762482A CN 104460763 B CN104460763 B CN 104460763B
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Abstract
The invention relates to a temperature control circuit of the production environment and discloses a constant-temperature control switching circuit. The constant-temperature control switching circuit is composed of a power circuit, an information processing circuit and a control output circuit. In the information processing circuit, a lower limit temperature signal end is connected to the input end of a NOT gate a through an isolating diode a; an upper limit temperature signal end is connected to the input end of a NOT gate b through an isolating diode b; the output end of the NOT gate b is connected to the input end of the NOT gate a through an isolating diode d; the output end of the NOT gate a is connected to the input end of the NOT gate b through an isolating diode c. In the control output circuit, a first pin of a drive resistor is connected to the negative pole of the isolating diode d and the negative pole of the isolating diode a; a second pin of the drive resistor is connected to the base of an audion; the collector of the audion is connected to a coil of a relay; a contact switch of the relay is connected between a control end a and a control end b. The constant-temperature control switching circuit is suitable for being applied in agricultural greenhouses or floriculture greenhouses or spinning production workshops, and has the advantages of being simple in structure and low in manufacturing cost.
Description
Technical field
The present invention relates to a kind of electronic circuit, be related specifically to the temperature-control circuit of production environment.
Background technology
In places such as agricultural greenhouse, floriculture greenhouse, textile manufacturing workshops, need to keep constant temperature, heating installation need to be provided winter, the summer
Season need to provide cold air, is conducive to greenhouse crops, the greenhouse of flower growth to build, or favorably improves quality of textile products and product
The production environment of amount.
Agricultural greenhouse is a kind of framework structure of film with heat-insulating property, and its appearance makes people can have anti-season
Vegetable and fruit.General agricultural greenhouse uses bamboo structure or the skeleton of steel construction, is covered with one or more layers insulating plastic pipe above
Film, material is thus formed a greenhouse space.Adventitia stops the loss of carbon dioxide produced by internal vegetable growth well,
There is in making canopy good heat insulation effect.When night or the rainy weather in winter, the temperature in agricultural greenhouse is too low, unfavorable fruit
Vegetables grow, and affect fruit-vegetable quality and yield.
Utilize underground heat that agricultural greenhouse, floriculture greenhouse or textile manufacturing workshop carry out heating have energy-conservation and reduce discharging greenhouse gas
The important meaning of body, in the winter time, when the temperature in above-mentioned place is too low, pumps with pump handle geothermal water, then with circulation
Mode by radiator to carrying out heat release in above-mentioned place, to keep constant temperature；In summer, when the temperature in above-mentioned place is too high
Time, underground cold water is pumped and is absorbed heat in above-mentioned place by radiator, to keep constant temperature.In order to make agricultural greenhouse,
The places such as floriculture greenhouse, textile manufacturing workshop keep constant temperature and save the energy, need a kind of constant temperature being suitable for the application of above-mentioned place
Control switch.
Summary of the invention
The invention aims to provide a kind of thermostatic control on-off circuit, be suitable at agricultural greenhouse, floriculture greenhouse or spin
Knit in workshop and apply, it is achieved automatically control, make terrestrial heat utilization system rationally run, for agricultural greenhouse, floriculture greenhouse or spin
Knit workshop and build the favourable environment produced, save manpower and avoid waste of energy.
A kind of thermostatic control on-off circuit of the present invention, is characterized in that controlling on-off circuit by power circuit, information processing
Circuit and control output circuit composition, wherein, in power circuit: the primary coil of rectifier transformer (TC) is connected to the phase of power supply
The zero line input (1) of line input (2) and power supply, the secondary coil of rectifier transformer (TC) is connected to bridge rectifier
(VD) two inputs, the positive pole of bridge rectifier (VD) is connected to filter capacitor a(C1) positive pole and voltage stabilizing integrated
The input of block (IC1), the outfan of integrated package of pressure-stabilizing (IC1) and filter capacitor b(C2) positive pole be connected after constitute direct current
Working power (V+), the negative pole of bridge rectifier (VD), filter capacitor a(C1) negative pole, filter capacitor b(C2) negative
The earth terminal of pole and integrated package of pressure-stabilizing (IC1) constitutes ground wire after connecting；In information-processing circuit: feed end (5) is connected to direct current
Working power (V+)；Lower limit temperature signal end (3) is connected to isolating diode a(V1) anode；Ceiling temperature signal end (4) is even
Receive isolating diode b(V2) anode, isolating diode b(V2) negative electrode be connected to not gate b(IC3) input, not gate b
(IC3) outfan is connected to isolating diode d(V4) anode, isolating diode d(V4) negative electrode and isolating diode a
(V1) negative electrode is connected to not gate a(IC2) input, not gate a(IC2) outfan be connected to isolating diode c(V3)
Anode, isolating diode c(V3) negative electrode be connected to not gate b(IC3) input；Control in output circuit: drive resistance
(R2) the first foot is connected to isolating diode d(V4) negative electrode and isolating diode a(V1) negative electrode, drive resistance (R2)
Crus secunda is connected to the base stage of audion (VT), and the emitter stage of audion (VT) is connected to ground wire, the colelctor electrode of audion (VT)
It is connected to the anode of clamp diode (V5) and coil (K) second end of relay, the negative electrode of clamp diode (V5) and relay
Coil (K) first end of device is connected to DC supply (V+), and contact switch (K1) first end of relay is connected to control
End a(6), contact switch (K1) second end of relay is connected to control end b(7).
In the present invention, at not gate b(IC3) input and ground wire between You Bang road resistance (R1)；Not gate a(IC2) and non-
Door b(IC3) share a digital integrated electronic circuit with six groups of not gates, unnecessary four groups of not gates are parallel to not gate b(IC3) upper or work
For spare part；Controlling the outer electric contact thermometer (TK) that is with of on-off circuit, the indicator electrode of electric contact thermometer (TK) is even
Receiving feed end (5), the lower limit electrode of electric contact thermometer (TK) is connected to lower limit temperature signal end (3), electric contact thermometer
(TK) upper limit electrode is connected to ceiling temperature signal end (4).
When the present invention applies, control the phase line input (2) in on-off circuit and zero line input (1) is connected to power line
Lu Shang；When water circulating pump is monophase machine, the control end a(6 controlling in on-off circuit) it is connected in the phase line of power supply,
Control end b(7) and the zero line of power supply be connected respectively on two terminals of pump motor winding；When water circulating pump is three-phase electricity
During machine, operate water priming of pump or stopping by catalyst, the control end a(6 controlling in on-off circuit) it is connected to three-phase
In a wherein phase line of power supply, control end b(7) and another root phase line of three phase mains be connected respectively to contactor coil
Two ends；The temperature-sensitive bag of electric contact thermometer (TK) is arranged in agricultural greenhouse, electric contact thermometer (TK) has indicator electrode,
Lower limit electrode and upper limit electrode, in the winter time, be arranged on the lower limit temperature of electric contact thermometer (TK) between 12 °-15 °, electricity
The ceiling temperature of contact temperature table (TK) is arranged between 18 °-20 °；In summer, the lower limit electrode of electric contact thermometer (TK)
Instead connecting to ceiling temperature signal end (4), the upper limit electrode of electric contact thermometer (TK) instead connects to lower limit temperature signal
End (3), is arranged on 25 ° the lower limit temperature of electric contact thermometer (TK), and the ceiling temperature of electric contact thermometer (TK) is arranged
At 28 °.As a example by the thermostatic control in winter of agricultural greenhouse, during work, when the lower limit temperature dropping to setting at temperature in agricultural greenhouse
When spending, the indicator of electric contact thermometer (TK) touches lower limit electrode, and high level is by lower limit temperature signal end (3) and isolation two
Pole pipe a(V1) enter into base stage and the not gate a(IC2 of audion (VT)) input, make audion (VT) turn on and make not gate a
(IC2) outfan is low level so that not gate b(IC3) input be low level, not gate b(IC3) outfan be high electricity
Flat, after audion (VT) conducting, coil (K) energising of relay, make contact switch (K1) adhesive of relay be energized, starting follows
Ring water pump operation, agricultural greenhouse is heated by pumping underground hot water in a looping fashion by radiator；Temperature in agricultural greenhouse
Degree raises along with the operation of water circulating pump, and the indicator electrode of electric contact thermometer (TK) leaves lower limit electrode, makes isolation two pole
Pipe a(V1) anode tap is low level, but at this moment not gate b(IC3) outfan be high level, high level passes through isolating diode
D(V4) be input to base stage and the not gate a(IC2 of audion (VT)) input, make audion (VT) be held on, maintain circulation
Water pump operation；Subsequently, the temperature in agricultural greenhouse continues to rise, when the temperature in agricultural greenhouse rises to the temperature set,
The indicator of electric contact thermometer (TK) touches upper limit electrode, and high level passes through ceiling temperature signal end (4) and isolating diode b
(V2) enter into not gate b(IC3) input, make not gate b(IC3) outfan be reversed to low level, audion (VT) ends,
Coil (K) power-off of relay, makes contact switch (K1) release of relay disconnect, and water circulating pump stops, at this moment, and not gate a
(IC2) input is low level, makes not gate a(IC2) outfan be reversed to high level, high level pass through isolating diode c
(V3) enter into not gate b(IC3) input, somewhat decline when the temperature in agricultural greenhouse and make electric contact thermometer (TK)
When indicator electrode leaves upper limit electrode, not gate b(IC3) outfan be still low level, maintain water circulating pump halted state, until
Dropping to the lower limit temperature set at a temperature of in agricultural greenhouse, water circulating pump again can starting operation.
In above-mentioned invention, use cheap diode and cheap not gate digital integrated electronic circuit to process information, according to
The lower limit temperature set or ceiling temperature control operation or the stopping of water circulating pump, and simply and cost is low to have circuit structure
Feature.Four groups of unnecessary not gates can be used as protection circuit or warning circuit.When being embodied as, not gate digital integrated electronic circuit selection type
Number being the cmos digital integrated circuit of CC40106 hex inverter, cmos digital integrated circuit has reliable operation and is hardly damaged
Feature.
The invention has the beneficial effects as follows: a kind of thermostatic control on-off circuit of offer, be suitable at agricultural greenhouse, floriculture greenhouse
Or textile manufacturing workshop is applied, lower limit temperature or ceiling temperature by setting automatically run or stop, and make geothermal utilization
System is rationally run, and builds the favourable environment produced for agricultural greenhouse, floriculture greenhouse or textile manufacturing workshop, saves manpower and keep away
Exempt from waste of energy.The present invention uses cheap diode and cheap not gate digital integrated electronic circuit to process information, makes circuit have
There are simple in construction and the low feature of cost.
Accompanying drawing explanation
Accompanying drawing is a kind of thermostatic control on-off circuit figure of the present invention.
In figure: R1. is close to road resistance, R2. drives resistance, and C1. filter capacitor a, C2. filter capacitor b, VD. bridge-type is whole
Current circuit, V1. isolating diode a, V2. isolating diode b, V3. isolating diode c, V4. isolating diode d, V5. clamper two
Pole is managed, VT. audion, V+. DC supply, IC1. integrated package of pressure-stabilizing, IC2. not gate a, IC3. not gate b, TC. rectifier transformer
Device, the coil of K. relay, the contact switch of K1. relay, TK. electric contact thermometer, FU. fuse, the phase line of L. power supply, N.
The zero line of power supply, 1. the zero line input of power supply, 2. the phase line input of power supply, 3. lower limit temperature signal end, 4. ceiling temperature
Signal end, 5. feed end, 6. control end a, 7. control end b.
Detailed description of the invention
In embodiment embodiment shown in the drawings, a kind of thermostatic control on-off circuit, by power circuit, information processing
Circuit and control output circuit composition, wherein, power circuit is by rectifier transformer (TC), phase line input (2), zero line input
(1), bridge rectifier (VD), filter capacitor a(C1), integrated package of pressure-stabilizing (IC1) and filter capacitor b(C2) constitute, whole
The primary coil of convertor transformer (TC) is connected to phase line input (2) and zero line input (1), the secondary of rectifier transformer (TC)
Coil is connected to two inputs of bridge rectifier (VD), and the positive pole of bridge rectifier (VD) is connected to filter capacitor
A(C1) positive pole and the input of integrated package of pressure-stabilizing (IC1), the outfan of integrated package of pressure-stabilizing (IC1) and filter capacitor b(C2)
Positive pole connect after constitute DC supply (V+), the negative pole of bridge rectifier (VD), filter capacitor a(C1) negative
Pole, filter capacitor b(C2) negative pole and integrated package of pressure-stabilizing (IC1) earth terminal connect after constitute ground wire；Information-processing circuit
By feed end (5), lower limit temperature signal end (3), ceiling temperature signal end (4), not gate b(IC3), not gate b(IC3), isolation two
Pole pipe a(V1), isolating diode b(V2), isolating diode c(V3) and isolating diode d(V4) constitute, feed end (5) connect
To DC supply (V+), lower limit temperature signal end (3) is connected to isolating diode a(V1) anode, ceiling temperature signal
End (4) be connected to isolating diode b(V2) anode, isolating diode b(V2) negative electrode be connected to not gate b(IC3) input
End, at not gate b(IC3) input and ground wire between You Bang road resistance (R1), not gate b(IC3) outfan be connected to isolation
Diode d(V4) anode, isolating diode d(V4) negative electrode and isolating diode a(V1) negative electrode be connected to not gate a
(IC2) input, not gate a(IC2) outfan be connected to isolating diode c(V3) anode, isolating diode c(V3)
Negative electrode is connected to not gate b(IC3) input；Control output circuit by driving resistance (R2), audion (VT), clamp diode
(V5), relay, control end a(6) and control end b(7) constitute, relay includes coil (K) and contact switch (K1), drives electric
Resistance (R2) the first foot be connected to isolating diode d(V4) negative electrode and isolating diode a(V1) negative electrode, drive resistance (R2)
Crus secunda be connected to the base stage of audion (VT), the emitter stage of audion (VT) is connected to ground wire, the current collection of audion (VT)
Pole is connected to the anode of clamp diode (V5) and coil (K) second end of relay, the negative electrode of clamp diode (V5) and continuing
Coil (K) first end of electrical equipment is connected to DC supply (V+), and contact switch (K1) first end of relay is connected to control
End a(6 processed), contact switch (K1) second end of relay is connected to control end b(7).In the present embodiment, not gate a(IC2) and non-
Door b(IC3) share a digital integrated electronic circuit with six groups of not gates, the CMOS number selecting model to be CC40106 hex inverter
Word integrated circuit, unnecessary four groups of not gates are parallel to not gate b(IC3) go up or as spare part；Control the outer of on-off circuit to be with
Electric contact thermometer (TK), the indicator electrode of electric contact thermometer (TK) is connected to feed end (5), electric contact thermometer (TK)
Lower limit electrode is connected to lower limit temperature signal end (3), and the upper limit electrode of electric contact thermometer (TK) is connected to ceiling temperature signal
End (4).
During the present embodiment application, control the phase line input (2) in on-off circuit and zero line input (1) is connected to power supply
On circuit；When water circulating pump is monophase machine, the control end a(6 controlling in on-off circuit) it is connected in the phase line of power supply,
Control end b(7) and the zero line of power supply be connected respectively on two terminals of pump motor winding；When water circulating pump is three-phase
During motor, operate water priming of pump or stopping by catalyst, the control end a(6 controlling in on-off circuit) it is connected to three
In a wherein phase line of phase power supply, control end b(7) and another root phase line of three phase mains be connected respectively to contactor coil
Two ends；The temperature-sensitive bag of electric contact thermometer (TK) is arranged in agricultural greenhouse, electric contact thermometer (TK) has indicator electricity
Pole, lower limit electrode and upper limit electrode, in the winter time, be arranged on the lower limit temperature of electric contact thermometer (TK) between 12 °-15 °,
The ceiling temperature of electric contact thermometer (TK) is arranged between 18 °-20 °；In summer, rationing the power supply under electric contact thermometer (TK)
Pole instead connects to ceiling temperature signal end (4), and the upper limit electrode of electric contact thermometer (TK) instead connects to lower limit temperature letter
Number end (3), the lower limit temperature of electric contact thermometer (TK) is arranged on 25 °, the ceiling temperature of electric contact thermometer (TK) is set
Put at 28 °.As a example by the thermostatic control in winter of agricultural greenhouse, during work, when the lower limit dropping to setting at temperature in agricultural greenhouse
During temperature, the indicator of electric contact thermometer (TK) touches lower limit electrode, and high level is by lower limit temperature signal end (3) and isolation
Diode a(V1) enter into base stage and the not gate a(IC2 of audion (VT)) input, make audion (VT) turn on and make non-
Door a(IC2) outfan be low level so that not gate b(IC3) input be low level, not gate b(IC3) outfan be
High level, after audion (VT) conducting, coil (K) energising of relay, make contact switch (K1) adhesive of relay be energized, rise
Dynamic water circulating pump runs, and agricultural greenhouse is heated by pumping underground hot water in a looping fashion by radiator；In agricultural greenhouse
Temperature raise along with the operation of water circulating pump, the indicator electrode of electric contact thermometer (TK) leaves lower limit electrode, makes isolation
Diode a(V1) anode tap is low level, but at this moment not gate b(IC3) outfan be high level, high level is by isolating two poles
Pipe d(V4) be input to base stage and the not gate a(IC2 of audion (VT)) input, make audion (VT) be held on, maintenance follows
Ring water pump operation；Subsequently, the temperature in agricultural greenhouse continues to rise, when the temperature in agricultural greenhouse rises to the temperature of setting
Time, the indicator of electric contact thermometer (TK) touches upper limit electrode, and high level is by ceiling temperature signal end (4) and isolation two poles
Pipe b(V2) enter into not gate b(IC3) input, make not gate b(IC3) outfan be reversed to low level, audion (VT) cut
Only, coil (K) power-off of relay, make contact switch (K1) release of relay disconnect, water circulating pump stops, at this moment, not gate a
(IC2) input is low level, makes not gate a(IC2) outfan be reversed to high level, high level pass through isolating diode c
(V3) enter into not gate b(IC3) input, somewhat decline when the temperature in agricultural greenhouse and make electric contact thermometer (TK)
When indicator electrode leaves upper limit electrode, not gate b(IC3) outfan be still low level, maintain water circulating pump halted state, until
The lower limit temperature set, water circulating pump starting operation again is dropped at a temperature of in agricultural greenhouse.
Claims (4)
1. a thermostatic control on-off circuit, is made up of power circuit, information-processing circuit and control output circuit, wherein, and electricity
In source circuit: the primary coil of rectifier transformer (TC) is connected to phase line input (2) and the zero line input of power supply of power supply
(1), the secondary coil of rectifier transformer (TC) is connected to two inputs of bridge rectifier (VD), bridge rectifier
(VD) positive pole is connected to filter capacitor a(C1) positive pole and the input of integrated package of pressure-stabilizing (IC1), integrated package of pressure-stabilizing
(IC1) outfan and filter capacitor b(C2) positive pole be connected after constitute DC supply (V+), bridge rectifier
(VD) negative pole, filter capacitor a(C1) negative pole, filter capacitor b(C2) negative pole and the ground connection of integrated package of pressure-stabilizing (IC1)
End constitutes ground wire after connecting；Feed end (5) in information-processing circuit is connected to DC supply (V+)；Control output circuit
In: driving the crus secunda of resistance (R2) to be connected to the base stage of audion (VT), the emitter stage of audion (VT) is connected to ground wire, and three
The colelctor electrode of pole pipe (VT) is connected to the anode of clamp diode (V5) and coil (K) second end of relay, clamp diode
(V5) negative electrode and coil (K) first end of relay are connected to DC supply (V+)；
It is characterized in that in information-processing circuit: lower limit temperature signal end (3) is connected to isolating diode a(V1) anode；The upper limit
Temperature signal end (4) is connected to isolating diode b(V2) anode, isolating diode b(V2) negative electrode be connected to not gate b
(IC3) input, not gate b(IC3) outfan be connected to isolating diode d(V4) anode, isolating diode d(V4)
Negative electrode and isolating diode a(V1) negative electrode be connected to not gate a(IC2) input, not gate a(IC2) outfan be connected to
Isolating diode c(V3) anode, isolating diode c(V3) negative electrode be connected to not gate b(IC3) input；Control output
Driving resistance (R2) the first foot in circuit is connected to isolating diode d(V4) negative electrode and isolating diode a(V1) negative electrode,
Contact switch (K1) first end of relay is connected to control end a(6), contact switch (K1) second end of relay is connected to control
End b(7 processed), control end a(6) be connected in the phase line of power supply, control end b(7) and the zero line of power supply be connected respectively to water pump
On two terminals of motor winding.
A kind of thermostatic control on-off circuit the most according to claim 1, is characterized in that at not gate b(IC3) input with
You Bang road resistance (R1) between ground wire.
A kind of thermostatic control on-off circuit the most according to claim 1, is characterized in that not gate a(IC2) and not gate b(IC3)
Sharing a digital integrated electronic circuit with six groups of not gates, unnecessary four groups of not gates are parallel to not gate b(IC3) go up or as standby unit
Part.
A kind of thermostatic control on-off circuit the most according to claim 1, is characterized in that controlling the outer of on-off circuit is with electricity
Contact temperature table (TK), the indicator electrode of electric contact thermometer (TK) is connected to feed end (5), under electric contact thermometer (TK)
Pole of rationing the power supply is connected to lower limit temperature signal end (3), and the upper limit electrode of electric contact thermometer (TK) is connected to ceiling temperature signal end
(4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410762482.4A CN104460763B (en) | 2014-12-14 | 2014-12-14 | Constant-temperature control switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410762482.4A CN104460763B (en) | 2014-12-14 | 2014-12-14 | Constant-temperature control switching circuit |
Publications (2)
| Publication Number | Publication Date |
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| CN104460763A CN104460763A (en) | 2015-03-25 |
| CN104460763B true CN104460763B (en) | 2017-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410762482.4A Active CN104460763B (en) | 2014-12-14 | 2014-12-14 | Constant-temperature control switching circuit |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105072794B (en) * | 2015-08-03 | 2017-06-06 | 衢州昀睿工业设计有限公司 | A kind of drive control circuit of high-frequency arc strike power supply |
| CN105007679B (en) * | 2015-08-14 | 2017-06-06 | 衢州昀睿工业设计有限公司 | The control circuit of batch (-type) high-frequency arc strike power supply |
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|---|---|---|---|---|
| CN2131049Y (en) * | 1992-06-29 | 1993-04-28 | 李复生 | Temp sensing timer for fume extractor |
| CN201965494U (en) * | 2011-03-17 | 2011-09-07 | 商丘市电业局永城分局 | Double-limit temperature controller of machine cabinet |
| CN103125317A (en) * | 2013-02-19 | 2013-06-05 | 衢州市煜鑫农产品加工技术开发有限公司 | Automatic ventilation controller of vegetable greenhouse |
| CN103645218A (en) * | 2013-11-26 | 2014-03-19 | 苏州贝克微电子有限公司 | Capacitive fuel composition sensor with slow oscillator and high-speed switch |
| CN204229268U (en) * | 2014-12-14 | 2015-03-25 | 衢州市煜鑫农产品加工技术开发有限公司 | A kind of thermostatic control on-off circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5665218A (en) * | 1979-11-02 | 1981-06-02 | Matsushita Electric Ind Co Ltd | Temperature control device |
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2014
- 2014-12-14 CN CN201410762482.4A patent/CN104460763B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2131049Y (en) * | 1992-06-29 | 1993-04-28 | 李复生 | Temp sensing timer for fume extractor |
| CN201965494U (en) * | 2011-03-17 | 2011-09-07 | 商丘市电业局永城分局 | Double-limit temperature controller of machine cabinet |
| CN103125317A (en) * | 2013-02-19 | 2013-06-05 | 衢州市煜鑫农产品加工技术开发有限公司 | Automatic ventilation controller of vegetable greenhouse |
| CN103645218A (en) * | 2013-11-26 | 2014-03-19 | 苏州贝克微电子有限公司 | Capacitive fuel composition sensor with slow oscillator and high-speed switch |
| CN204229268U (en) * | 2014-12-14 | 2015-03-25 | 衢州市煜鑫农产品加工技术开发有限公司 | A kind of thermostatic control on-off circuit |
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