CN107367069A - A kind of air-source water heater voltage regulating and controlling circuit - Google Patents
A kind of air-source water heater voltage regulating and controlling circuit Download PDFInfo
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- CN107367069A CN107367069A CN201710523859.4A CN201710523859A CN107367069A CN 107367069 A CN107367069 A CN 107367069A CN 201710523859 A CN201710523859 A CN 201710523859A CN 107367069 A CN107367069 A CN 107367069A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 37
- 230000001276 controlling effect Effects 0.000 title claims abstract description 32
- 230000009466 transformation Effects 0.000 claims abstract description 12
- 239000004065 semiconductor Substances 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 11
- 239000003381 stabilizer Substances 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 239000003507 refrigerant Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 4
- 239000003570 air Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Resistance Heating (AREA)
- Control Of Voltage And Current In General (AREA)
Abstract
A kind of air-source water heater voltage regulating and controlling circuit of the present invention, water temperature signal in temperature signal collection circuit collection air-source water heater attemperater, water temperature signal is scaling by the subtracter acquisition temperature difference, diode clamp is in 0 ~+5V, according to the size of the water temperature signal after clamper, one can be made to turn on step by step to level Four triode in voltage regulating and controlling circuit step by step, shut-off, change the transformation ratio of step-up transformer in coupled voltages circuit, realize the regulation and control of output voltage, efficiently solve existing Control heating, constant temperature is difficult to control, the problem of inconvenient for use and security is low and frequency converter thermostatic control cost is high.Temperature sensor of the present invention gathers the temperature signal in water tank in real time, operational amplifier subtraction, temperature differential information triggering corresponding one is exported to level Four triode ON or shut-off, change the transformation ratio of step-up transformer, the regulation and control of output voltage are realized, and then adjust the power of compressor, the water temperature in attemperater is in temperature constant state, simple and practical, cost is low.
Description
Technical field
The invention belongs to air-source water heater technical field, particularly a kind of air-source water heater voltage regulating and controlling circuit.
Background technology
Air-source water heater free of contamination advantage, is widely used, air energy because of energy-saving and environmental protection by many enterprises and family
Water heater is mainly made up of the circulatory system and refrigerant, and operation principle is：Refrigerant is under compressor effect in system inner recirculation flow
Dynamic, liquid refrigerants flows through the low-temperature heat quantity in heat sink ambient air, and gaseous state, gaseous state are converted into by liquid after heat absorption evaporation
The low-temperature heat quantity absorbed in air is converted into heat of high temperature by the compressed boosting of refrigerant, and heat is discharged when flowing through heat exchanger to cold water
Being heated, the refrigerant after heat release is converted into liquid by gaseous state, the low-temperature heat quantity being again introduced into heat sink ambient air,
Gaseous state, boosting heating are converted into after heat absorption evaporation again, refrigerant constantly circulates, and the low-temperature heat quantity in air just constantly is carried
And heat of high temperature is converted into, discharge in water cool water heating.
At present, air-source water heater is typically heated by Control, when temperature is less than given threshold temperature, relay
Device adhesive, switches on power and water is heated, and when temperature reaches given threshold temperature, relay disconnects, and stops carrying out water
Heating, on the one hand occurs the sometimes hot and sometimes cold situation of water, many inconvenience can be brought to user；Another aspect water temperature difference hour,
Easily there is get an electric shock frequent adhesive, the phenomenon of disconnection, can also cause Arcing so as to influence relay life, cause fire；
Or the power of compressor electric motor is adjusted by frequency converter, and then the water temperature in attemperater is in temperature constant state, such a method
Save, effectively, but cost is high.
So the present invention provides a new technical scheme to solve this problem.
The content of the invention
In view of the above-mentioned problems, to overcome problem present in the existing stage, the present invention provides a kind of air-source water heater electricity
Circuit for regulating and controlling is pressed, efficiently solves existing Control heating, constant temperature is difficult to control, and inconvenient for use and security is low and becomes
The problem of frequency device thermostatic control cost is high.
Its technical scheme solved is, including temperature signal collection circuit, step by step voltage regulating and controlling circuit and coupled voltages electricity
Road, it is characterised in that the water temperature signal in temperature signal collection circuit collection air-source water heater attemperater, water temperature signal warp
It is the electricity of regulating and controlling voltage step by step to cross subtracter and obtain the water temperature signal that the temperature difference is scaling, diode clamp is after 0 ~+20V, clamper
The trigger signal of one-level triode in road, the becoming larger of water temperature signal after clamper can make in voltage regulating and controlling circuit step by step one to
Level Four triode turns on step by step, and one to level Four triode turns on can change step-up transformer in coupled voltages circuit step by step step by step
Transformation ratio, realize the regulation and control of output voltage；
The voltage regulating and controlling circuit step by step is connected in parallel using triode Q1 ~ Q4, forms one to level Four triode circuit step by step,
Triode Q1 ~ Q4 emitter stage difference connecting resistance R1 ~ R4 one end and diode D1 ~ D4 positive pole, triode Q1 ~ Q4 current collection
End points meets power supply+50V to pole and diode D1 ~ D4 negative pole altogether.
Preferably, the coupled voltages circuit includes step-up transformer T1, and step-up transformer T1 primary coils are with three
The transformer of individual tap 2,3,4, according to transformation ratio formula N1/N2=U1/U2, using in voltage regulating and controlling circuit step by step not at the same level three
The conducting of pole pipe, change the number of turn of step-up transformer T1 primary coils, and then change the voltage of step-up transformer T1 secondary coils,
Step-up transformer T1 the end of a thread 1 connects the output end of level Four triode regulating circuit, and step-up transformer T1 tap 2,3,4 is distinguished
Connect three-level, two level, the output end of one-level triode regulating circuit, step-up transformer T1 the end of a thread 5 by electric capacity C1 connections,
The end of a thread 6, the end of a thread 7 are connected with current protecting circuit in step-up transformer T1 secondary coil.
Preferably, the temperature signal collection circuit includes temperature sensor P1, and temperature sensor P1 pin 1 connects electricity
Source+5V, temperature sensor P1 pin 2 connect resistance R9 one end, resistance R9 other end difference concatenation operation amplification respectively
Device AR1 pin 2, grounding resistance R8 one end, the operational amplifier A R1 connection of pin 4 ground, operational amplifier A R1 pin 7
Power supply+5V is connected, operational amplifier A R1 pin 1 connects resistance R7 one end, resistance R6 one end respectively, and resistance R6's is another
One end connection potentiometer RP1 adjustable end, potentiometer RP1 upper end connection power supply+5V, potentiometer RP1 lower end connection resistance
R5 one end, resistance R5 other end connection ground, the resistance R7 other end difference concatenation operation amplifier AR1 pin 3, resistance
R10 one end, resistance R10 other end connection voltage-stabiliser tube DZ1 negative pole, voltage-stabiliser tube DZ1 positive pole connect diode D6 respectively
Negative pole, diode D7 negative pole, step by step in voltage regulating and controlling circuit one-level triode base stage, diode D6 positive pole connection electricity
Source+5V, diode D7 positive pole connection power supply 0V.
Preferably, the current protecting circuit includes metal-oxide-semiconductor Q5, metal-oxide-semiconductor Q5 grid connect respectively diode D5 negative poles,
Resistance R5 left ends, the end of a thread 6 in diode D5 positive poles connection step-up transformer T1 secondary coil, metal-oxide-semiconductor Q5 source electrode connection electricity
Resistance R5 right-hand members, the one end for regulating and controlling voltage output, connection insures F1 right-hand member, regulates and controls voltage output respectively for metal-oxide-semiconductor Q5 drain electrode
The other end, the end of a thread 7 in the secondary coil for the left end connection step-up transformer T1 for insuring F1.
Due to the use of above technical scheme, the present invention has the following advantages that compared with prior art；
1, the temperature signal in water tank is gathered in real time according to temperature sensor, by operational amplifier subtraction, output temperature difference letter
Cease, triggering corresponding one to level Four triode ON or shut-off, change the transformation ratio of step-up transformer, realize the tune of output voltage
Control, and then the power of compressor is adjusted, the water temperature in attemperater is in temperature constant state, simple and practical, cost is low；
2, output loop has an overcurrent protection, load short circuits or output loop impedance is small when causing electric current excessive, metal-oxide-semiconductor Q5 conductings,
Electric current flows to loop across load by source-drain electrode, and electric current increased dramatically, and insurance F1 disconnects, and realizes overcurrent protection, securely and reliably.
Brief description of the drawings
Fig. 1 is the voltage regulating and controlling circuit catenation principle figure of the present invention.
Fig. 2 is the signal flow graph of the voltage regulating and controlling circuit step by step of the present invention.
Embodiment
For the present invention foregoing and other technology contents, feature and effect, in following cooperation with reference to figures 1 through Fig. 2 pairs
In the detailed description of embodiment, can clearly it present.The structure content being previously mentioned in following examples, it is attached with specification
Figure is reference.
The embodiment of the present invention is described further below in conjunction with accompanying drawing.
Embodiment one, a kind of air-source water heater voltage regulating and controlling circuit, including TEMP in temperature signal collection circuit
Device detects the temperature signal in attemperater and is converted to electric signal in real time, by subtraction obtain the temperature difference again it is scaling,
Diode clamp is sent to the trigger signal for making one-level triode in voltage regulating and controlling circuit step by step after 0 ~+5V, arrow in accompanying drawing 2
Trigger signal triggering one is designated as to level Four triode ON or the signal flow graph of shut-off, corresponding one to level Four triode ON
Or shut-off, the transformation ratio of step-up transformer can be changed, realize the regulation and control of output voltage, and then the power of compressor is adjusted, make guarantor
Water temperature in reservoir is in temperature constant state；The voltage regulating and controlling circuit step by step uses core parts triode Q1 ~ Q4 parallel connection
Connection, one is formed to level Four triode circuit step by step, specifically when being just switched on power supply, the now normal temperature of the water in attemperater
Temperature, it is assumed that be 10 DEG C, set water temperature is 80 DEG C, and the temperature difference is big, now temperature signal collection circuit output HIGH voltage, and this voltage touches
Hair triode Q1 ~ Q4 is turned on step by step, CE junction voltage, resistance R1 ~ R4 of the+50V voltages by triode Q1 ~ Q4, is added to boosting
1,2,3,4 ends of transformer T1 primary coil, now, step-up transformer T1 number of primary turns is 4 ends to the circle between 5 ends
Number, with the rise of the water temperature in attemperater, when reaching design temperature, temperature signal collection circuit exports low-voltage,
This voltage triggered triode Q1 is turned on, and triode Q2, Q3, Q4 are turned off, and step-up transformer T1 number of primary turns arrives for 1 end
The number of turn between 5 ends, it can be radiated as the use of user need to enter cold water or water tank internal-external temperature difference, the water temperature in attemperater
It can change, temperature signal collection circuit output voltage, triode Q1, Q2 conducting, or triode Q1, Q2, Q3 conducting, rise
Pressure transformer T1 number of primary turns is 2 ends to the number of turn between 5 ends or 3 ends to the number of turn between 5 ends.
Embodiment two, on the basis of embodiment one, the regulation and control of the coupled voltages circuit realiration output voltage, and then adjust
The power of compressor is saved, including step-up transformer T1, step-up transformer T1 primary coil are the transformation with three taps 2,3,4
Device, step-up transformer T1 the end of a thread 1 connect the output end of level Four triode regulating circuit, step-up transformer T1 tap 2,3,4
Three-level, two level, the output end of one-level triode regulating circuit are connected respectively, and step-up transformer T1 the end of a thread 5 is connected by electric capacity C1
Ground connection, according to transformation ratio formula N1/N2=U1/U2, using the conducting of triode not at the same level in voltage regulating and controlling circuit step by step, change
The number of turn of step-up transformer T1 primary coils, and then change the voltage of step-up transformer T1 secondary coils, step-up transformer T1's
The end of a thread 6, the end of a thread 7 are connected with current protecting circuit in secondary coil.
Embodiment three, on the basis of embodiment one, temperature signal collection circuit is used to detect in attemperater in real time
Temperature signal is simultaneously converted to electric signal, by subtracter obtain the temperature difference again scaling, diode clamp after 0 ~+5V, including
Model TPS35 temperature sensor P1, wide -50 DEG C to+150 DEG C of its measurement range, directly connects as in attemperater with water
Touch, precision is high, and temperature sensor P1 pin 1 connects power supply+5V, and temperature sensor P1 pin 2 will sense water temperature information and turn
- 0.5V-1.5V information of voltage UI1 is changed to, by being sent to the same mutually defeated of operational amplifier A R1 after resistance R8, resistance R9 partial pressures
Enter end, the operational amplifier A R1 connection of pin 4 ground, operational amplifier A R1 pin 7 connects power supply+5V, operational amplifier A R1
Inverting input connection resistance R5, potentiometer RP1 bleeder circuits, adjust electricity corresponding to potentiometer RP1 adjustable settings water temperatures
Press UI2, resistance R7, resistance R6 composition operational amplifier A R1 feedback circuit, operational amplifier A R1 output voltage Uo=R7
/R6（UI1-UI2）, this output voltage Uo is after resistance R10 current limlitings, voltage-stabiliser tube DZ1 voltage stabilizings, then through diode D6, diode D7
The clamp circuit clamper of composition is sent to voltage regulating and controlling circuit step by step after 0 ~+5V.
Example IV, on the basis of embodiment two, the current protecting circuit is used for load short circuits or output loop hinders
Anti- small when causing electric current excessive, insurance F1 disconnects, and metal-oxide-semiconductor Q5 is P-channel enhancement type pipe, and resistance R5 is the high-power electricity of small resistance
Resistance, with diode D5, resistance R5 composition current detecting part, when electric current exceedes setting electric current, metal-oxide-semiconductor Q5 is turned on, electric current across
Overload flows to loop by source-drain electrode, and electric current increased dramatically, and insurance F1 disconnects, and realizes overcurrent protection.
When the present invention is specifically used, TPS35 temperature sensor P1 turns the water temperature in air-source water heater attemperater
- 0.5V-1.5V information of voltage UI1 is changed to, by being sent to the same mutually defeated of operational amplifier A R1 after resistance R8, resistance R9 partial pressures
Enter end, the bleeder circuit of resistance R5, potentiometer RP1 composition is sent to operational amplifier A R1 as voltage UI2 corresponding to set water temperature
Inverting input, in the presence of feedback resistance R7, resistance R6, carry out subtraction, output temperature differential information through diode clamp
Position is sent to the trigger signal for making one-level triode in voltage regulating and controlling circuit step by step, when being just switched on power supply, now after 0 ~+5V
Water in attemperater is normal temperature temperature, and now the temperature difference is big, and the voltage after clamper is high voltage, this voltage triggered triode Q1 ~
Q4 is turned on step by step, CE junction voltage, resistance R1 ~ R4 of the+50V voltages by triode Q1 ~ Q4, is added to the first of step-up transformer T1
1,2,3,4 ends of level coil, now, step-up transformer T1 number of primary turns is 4 ends to the number of turn between 5 ends, according to transformation
Than formula N1/N2=U1/U2, the voltage of step-up transformer T1 secondary coils is maximum rated voltage；With the water in attemperater
The rise of temperature, when reaching design temperature, temperature signal collection circuit output low-voltage, this voltage triggered triode Q1 is led
Logical, triode Q2, Q3, Q4 are turned off, and step-up transformer T1 number of primary turns is 1 end to the number of turn between 5 ends, transformation of boosting
The voltage of device T1 secondary coils is minimum rated voltage；It can be carried out as the use of user need to enter cold water or water tank internal-external temperature difference
Radiating, the water temperature in attemperater can change, temperature signal collection circuit output voltage, triode Q1, Q2 conducting, or
Triode Q1, Q2, Q3 are turned on, and step-up transformer T1 number of primary turns is 2 ends to the number of turn between 5 ends or 3 ends between 5 ends
The number of turn, the voltage of step-up transformer T1 secondary coils regulates and controls between minimum rated voltage and maximum rated voltage, and then adjusts
The power of compressor is saved, the water temperature in attemperater is in temperature constant state, load short circuits or output loop impedance is small causes electricity
When flowing through big, metal-oxide-semiconductor Q5 conductings, electric current flows to loop across load by source-drain electrode, and electric current increased dramatically, and insurance F1 disconnects,
Realize overcurrent protection.
Described above is to combine embodiment further description made for the present invention, it is impossible to assert the present invention
Specific implementation is limited only to this；For belonging to the present invention and for those skilled in the technology concerned, based on skill of the present invention
Under the premise of art scheme thinking, the expansion made and operating method, the replacement of data, should all fall the scope of the present invention it
It is interior.
Claims (4)
1. a kind of air-source water heater voltage regulating and controlling circuit, including temperature signal collection circuit, step by step voltage regulating and controlling circuit and coupling
Close potential circuit, it is characterised in that the water temperature signal in temperature signal collection circuit collection air-source water heater attemperater, water
It is voltage step by step that warm signal obtains the water temperature signal that the temperature difference is scaling, diode clamp is after 0 ~+5V, clamper by subtracter
The trigger signal of one-level triode in circuit for regulating and controlling, the becoming larger for water temperature signal after clamper can make voltage regulating and controlling circuit step by step
In one turn on step by step to level Four triode, one to level Four triode turns on to change to boost in coupled voltages circuit step by step step by step and becomes
The transformation ratio of depressor, realize the regulation and control of output voltage；
The voltage regulating and controlling circuit step by step is connected in parallel using triode Q1 ~ Q4, forms one to level Four triode circuit step by step,
Triode Q1 ~ Q4 emitter stage difference connecting resistance R1 ~ R4 one end and diode D1 ~ D4 positive pole, triode Q1 ~ Q4 current collection
End points meets power supply+50V to pole and diode D1 ~ D4 negative pole altogether.
A kind of 2. air-source water heater voltage regulating and controlling circuit according to claim 1, it is characterised in that the coupled voltages
Circuit includes step-up transformer T1, and step-up transformer T1 primary coils are the transformer with three taps 2,3,4, according to transformation
Than formula N1/N2=U1/U2, using the conducting of triode not at the same level in voltage regulating and controlling circuit step by step, at the beginning of changing step-up transformer T1
The number of turn of level coil, and then change the voltage of step-up transformer T1 secondary coils, step-up transformer T1 the end of a thread 1 connects level Four three
The output end of pole pipe regulating circuit, step-up transformer T1 tap 2,3,4 connect three-level, two level, one-level triode pressure regulation respectively
The output end of circuit, step-up transformer T1 the end of a thread 5 is by electric capacity C1 connections ground, the end of a thread in step-up transformer T1 secondary coil
6th, the end of a thread 7 is connected with current protecting circuit.
A kind of 3. air-source water heater voltage regulating and controlling circuit according to claim 1, it is characterised in that the temperature signal
Acquisition Circuit includes temperature sensor P1, and temperature sensor P1 pin 1 connects power supply+5V, and temperature sensor P1 pin 2 divides
Not Lian Jie resistance R9 one end, resistance R9 other end difference concatenation operation amplifier AR1 pin 2, the one of grounding resistance R8
End, the operational amplifier A R1 connection of pin 4 ground, operational amplifier A R1 pin 7 connect power supply+5V, operational amplifier A R1's
Pin 1 connects resistance R7 one end, resistance R6 one end, resistance R6 other end connection potentiometer RP1 adjustable end, electricity respectively
Position device RP1 upper end connection power supply+5V, potentiometer RP1 lower end connection resistance R5 one end, resistance R5 other end connection
Ground, resistance R7 other end difference concatenation operation amplifier AR1 pin 3, resistance R10 one end, the resistance R10 other end connect
Voltage-stabiliser tube DZ1 negative pole is connect, voltage-stabiliser tube DZ1 positive pole connects diode D6 negative pole, step by step diode D7 negative pole, electricity respectively
Press the base stage of one-level triode in circuit for regulating and controlling, diode D6 positive pole connection power supply+5V, diode D7 positive pole connection power supply
0V。
A kind of 4. air-source water heater voltage regulating and controlling circuit according to claim 2, it is characterised in that the current protection
Circuit includes metal-oxide-semiconductor Q5, and metal-oxide-semiconductor Q5 grid connects diode D5 negative poles, resistance R5 left ends, the connection of diode D5 positive poles respectively
The end of a thread 6 in step-up transformer T1 secondary coil, metal-oxide-semiconductor Q5 source electrode connection resistance R5 right-hand members, the one end for regulating and controlling voltage output,
Connection insurance F1 right-hand member, the other end of regulation and control voltage output, the left end connection boosting for insuring F1 become respectively for metal-oxide-semiconductor Q5 drain electrode
The end of a thread 7 in depressor T1 secondary coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710523859.4A CN107367069B (en) | 2017-06-30 | 2017-06-30 | A kind of air-source water heater voltage regulating and controlling circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710523859.4A CN107367069B (en) | 2017-06-30 | 2017-06-30 | A kind of air-source water heater voltage regulating and controlling circuit |
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| Publication Number | Publication Date |
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| CN107367069A true CN107367069A (en) | 2017-11-21 |
| CN107367069B CN107367069B (en) | 2018-06-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710523859.4A Active CN107367069B (en) | 2017-06-30 | 2017-06-30 | A kind of air-source water heater voltage regulating and controlling circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110162129A (en) * | 2019-05-16 | 2019-08-23 | 武汉大学 | A kind of multi-stage, efficient rate linearly accurate AC voltage adjusting and stable-pressure device |
| CN110207397A (en) * | 2018-12-12 | 2019-09-06 | 华帝股份有限公司 | Fan gear speed regulating circuit, fan assembly applying same and gas water heater |
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| JP2008236867A (en) * | 2007-03-19 | 2008-10-02 | Kansai Electric Power Co Inc:The | Voltage adjuster with life span management function |
| CN201319151Y (en) * | 2008-12-02 | 2009-09-30 | 佛山市顺德区瑞德电子实业有限公司 | Refrigeration switch power supply for drinking fountain |
| WO2015135934A1 (en) * | 2014-03-11 | 2015-09-17 | Electricite De France | Power-adjustable electric water heater |
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| CN1192281A (en) * | 1995-08-01 | 1998-09-02 | 埃内科有限公司 | Method and device for continuous adjustment and regulation of a transformer turns ratio, and transformer provided with such a device |
| US6078148A (en) * | 1998-10-09 | 2000-06-20 | Relume Corporation | Transformer tap switching power supply for LED traffic signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110207397A (en) * | 2018-12-12 | 2019-09-06 | 华帝股份有限公司 | Fan gear speed regulating circuit, fan assembly applying same and gas water heater |
| CN110207397B (en) * | 2018-12-12 | 2023-11-10 | 华帝股份有限公司 | Fan step speed regulation circuit, fan assembly using same and gas water heater |
| CN110162129A (en) * | 2019-05-16 | 2019-08-23 | 武汉大学 | A kind of multi-stage, efficient rate linearly accurate AC voltage adjusting and stable-pressure device |
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| Publication number | Publication date |
|---|---|
| CN107367069B (en) | 2018-06-26 |
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