CN202615164U - Water heater automatic control circuit - Google Patents
Water heater automatic control circuit Download PDFInfo
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- CN202615164U CN202615164U CN 201220108446 CN201220108446U CN202615164U CN 202615164 U CN202615164 U CN 202615164U CN 201220108446 CN201220108446 CN 201220108446 CN 201220108446 U CN201220108446 U CN 201220108446U CN 202615164 U CN202615164 U CN 202615164U
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- automatic control
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Abstract
The utility model relates to the water heater field and specifically relates to a water heater automatic control circuit. The water heater automatic control circuit comprises a water flow signal detection circuit, a main solenoid valve drive control circuit and a one-chip microcomputer. The water flow signal detection circuit is connected with the main solenoid valve drive control circuit through the one-chip microcomputer. The water heater automatic control circuit further comprises a monostability protection circuit. The water flow signal detection circuit is connected with the main solenoid valve drive control circuit through the monostability protection circuit. The monostability protection circuit in the water heater automatic control circuit provided in the utility model is relatively independent in the whole control circuit. When the one-chip microcomputer is ineffective, a water heater can be prevented from being heated without water therein when no water flow signal is acquired. The whole water heater automatic control circuit eliminates the combustion gas leakage danger and guarantees the safety of a user.
Description
Technical field
The utility model relates to field of water heaters, more specifically to a kind of water heater automatic control circuit.
Background technology
The master controller that domestic existing full-automatic pressure exhaust or intelligent constant-temperature gas instantaneous water heater use; It all is the ASIC device that adopts single-chip microcomputer (MCU) or customization; Add the common automatic control circuit of forming of corresponding peripheral hardware circuit and embedded Control program, referring to accompanying drawing 1.The core of this automatic control circuit is exactly single-chip microcomputer (MCU) or ASIC device, and its effect is like people's brain.Single-chip microcomputer or ASIC device itself have comprised electron transistor thousands of or up to ten thousand.In addition, domestic existing full-automatic pressure exhaust or intelligent constant-temperature gas instantaneous water heater when detecting water-flow signal, use be water flow sensor, shown in accompanying drawing 2; It mainly is made up of axle 101, impeller 102, magnet 103, integrated hall element 104 and shell body, after current get into sensor cavity 105, promotes impeller 102 rotations; The magnet 103 that links to each other with impeller 102, also rotation simultaneously forms the magnetic field that changes; At this moment give the two ends energising of integrated hall element 104, the integrated hall element 104 after the energising produces induced electromotive force in the magnetic field that changes, and this signal is after the shaping of level behind the integrated hall element, processing and amplifying; Obtained a square-wave signal at output terminal, the frequency of this square-wave signal is directly proportional with rotating speed, and rotating speed is fast more; Frequency is high more, and vice versa, and is as shown in Figure 3.
Each element of tradition gas heater mainly receives the Single-chip Controlling in the automatic control circuit; But when single-chip microcomputer or software (embedded Control program) break down (reason of fault can not be predicted); Its partial function damages or when being interfered, the control function of single-chip microcomputer may lose efficacy.In this case, when detecting water inlet pipe, water flow sensor do not have water to get into water heater, when promptly not having water flow signal; But because single-chip microcomputer breaks down, mistake is thought has water to get into water heater, and Single-chip Controlling main solenoid valve driving circuit is opened; And then startup water heater; Water heater is carried out dry combustion method, can cause the leakage of combustion gas like this, the user is produced danger.
The utility model content
The purpose of the utility model is: possibly produce the situation of malfunction and failure to the single-chip microcomputer in the above-mentioned automatic control system, the characteristic of the square-wave signal of tie water flow sensor output simultaneously provides a kind of water heater automatic control circuit.
To achieve these goals, the technical scheme of the utility model employing is:
A kind of water heater automatic control circuit; Comprise water flow signal testing circuit, main solenoid valve Drive and Control Circuit and single-chip microcomputer; Said water flow signal testing circuit is connected with the main solenoid valve Drive and Control Circuit through single-chip microcomputer; Said water heater automatic control circuit also comprises the monostable holding circuit, and said water flow signal testing circuit is connected with the main solenoid valve Drive and Control Circuit through the monostable holding circuit.
In the above-mentioned water heater automatic control circuit; Said monostable holding circuit comprises the comparer and first triode, and the negative input end of said comparer is connected with power supply through the 3rd resistance respectively, and is connected with the collector of first triode through first resistance; The grounded emitter of first triode; Said the 3rd resistance is greater than the resistance of first resistance, and the negative input end of comparer also is connected with the positive terminal of first electric capacity, the negative pole end ground connection of said first electric capacity; It is high level or low level that the break-make of controlling first transistor collector and emitter through external signal can make the negative input end of comparer; The positive input terminal of said comparer is connected with power supply through the 4th resistance, and through the 5th resistance eutral grounding, the 4th resistance is identical with the resistance of the 5th resistance.
In the above-mentioned water heater automatic control circuit, comprise the 3rd triode in the said water flow signal testing circuit, the collector of said the 3rd triode is connected with the base stage of first triode through second resistance, second electric capacity in the monostable holding circuit successively.
In the above-mentioned water heater automatic control circuit, said main solenoid valve Drive and Control Circuit comprises the first reverse drive amplifier, and the first reverse drive amplifier input terminal is connected with the output terminal of comparer in the monostable holding circuit.
The water heater automatic control circuit of the utility model comprises water flow signal testing circuit, monostable holding circuit, main solenoid valve Drive and Control Circuit and single-chip microcomputer, and said monostable holding circuit comprises comparer.The water flow sensor of installing in the water heater produces induction electromotive force when having current to pass through, induction electromotive force obtains square-wave signal after the shaping of water flow signal testing circuit, processing and amplifying; Square-wave signal is input in the monostable holding circuit again, and square-wave signal is converted into level signal earlier and feeds comparer again; The high-low level train of signal that utilizes comparer to produce is become owner of in the solenoid Valve driving control circuit; The automatic control system of whole water heater is not when having water flow signal; Monostable holding circuit output signal, assurance main solenoid valve Drive and Control Circuit is closed, and then produces protective effect.
Compared with prior art, the beneficial effect of the utility model: the monostable holding circuit in the utility model water heater automatic control circuit opposes in the The whole control circuit relatively, not controlled by single-chip microcomputer or ASIC device; And directly act on the main solenoid valve Drive and Control Circuit; When not having water flow signal, monostable holding circuit output signal, assurance main solenoid valve Drive and Control Circuit is closed; When avoiding owing to the single-chip microcomputer actual effect; Cause the dry combustion method of water heater when not having water flow signal, whole water heater automatic control circuit is eliminated the danger that combustion gas is revealed, and guarantees user's security.
Description of drawings
The master controller theory diagram that Fig. 1 uses for existing water heater.
Fig. 2 is the structural representation of water flow sensor.
Fig. 3 is the square-wave signal figure that water flow sensor produced.
Fig. 4 is the schematic diagram of the utility model automatic control circuit.
Fig. 5 is the circuit theory diagrams of monostable holding circuit.
Fig. 6 is the theory diagram of the utility model automatic control circuit.
Mark among the figure: 1-water flow signal testing circuit, 2-monostable holding circuit, 3-main solenoid valve Drive and Control Circuit, 4-single-chip microcomputer, N6B-comparer; R48-first resistance, V33-first triode, C25-first electric capacity, R47-second resistance, C28-second electric capacity; R52-the 3rd resistance, R49-the 4th resistance, R50-the 5th resistance, R51-the 6th resistance, R53-the 7th resistance; V10-first diode, the D2A-first reverse drive amplifier, the D3B-second reverse drive amplifier, V12-second diode, R60-the 8th resistance; R61-the 9th resistance, V9-second triode, V14-the 3rd diode, V32-the 3rd triode.
Embodiment
Below in conjunction with accompanying drawing, the utility model is done detailed explanation.
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Embodiment 1
Shown in accompanying drawing 4, accompanying drawing 5; The water heater automatic control circuit of present embodiment; Comprise water flow signal testing circuit 1, main solenoid valve Drive and Control Circuit 3 and single-chip microcomputer 4; Said water flow signal testing circuit 1 is connected with main solenoid valve Drive and Control Circuit 3 through single-chip microcomputer 4, and said water heater automatic control circuit also comprises monostable holding circuit 2, and said water flow signal testing circuit 1 is connected with main solenoid valve Drive and Control Circuit 3 through monostable holding circuit 2.Said monostable holding circuit comprises the comparer N6B and the first triode V33; The negative input end of said comparer N6B is connected with power supply through the 3rd resistance R 52 respectively; And be connected with the collector of the first triode V33 through first resistance R 48, the grounded emitter of the first triode V33, said the 3rd resistance R 52 is far longer than the resistance of first resistance R 48; The negative input end of comparer N6B also is connected with the positive terminal of first capacitor C 25; The negative pole end ground connection of said first capacitor C 25, it is high level or low level that the break-make of controlling the first triode V33 collector and emitter through external signal can make the negative input end of comparer N6B, the positive input terminal of said comparer N6B is connected with power supply through the 4th resistance R 49; And through the 5th resistance R 50 ground connection; The 4th resistance R 49 is identical with the resistance of the 5th resistance R 50, and making the positive input terminal voltage of comparer N6B is 1/2VCC, is convenient to compare with the negative input end of comparer.Comprise the 3rd triode V32 in the water flow signal testing circuit 1; The collector of said the 3rd triode V32 is connected with the base stage of the first triode V33 through second resistance R 47, second capacitor C 28 in the monostable holding circuit 2 successively, and the emitter of the said first triode V33 passes through the first diode V10 and is connected with base stage; The output terminal of said comparer N6B is connected with comparer N6B positive input terminal through the 6th resistance R 51, also is connected with the negative input end of comparer N6B with the 3rd resistance R 52 through the 7th resistance R 53, forms positive feedback loop.Main solenoid valve Drive and Control Circuit 3 comprises the first reverse drive amplifier D2A, and the input end of the first reverse drive amplifier D2A is connected with the output terminal of comparer N6B in the monostable holding circuit 2.
Shown in accompanying drawing 6, be the theory diagram of present embodiment automatic control circuit, the monostable holding circuit is relatively independent, and input signal is the discharge square-wave signal, and the output signal is a level signal.
Water flow sensor is installed in the water heater, when having current to pass through, produces induction electromotive force, induction electromotive force obtains square-wave signal after 1 shaping of water flow signal testing circuit, processing and amplifying; Square-wave signal is input in the monostable holding circuit 2 again, and square-wave signal is converted into level signal earlier and feeds among the comparer N6B again; The high-low level train of signal that utilizes comparer N6B to produce is become owner of in the solenoid Valve driving control circuit 3.The automatic control circuit of whole water heater is not when having water flow signal, and monostable holding circuit 2 is exported signals, and assurance main solenoid valve Drive and Control Circuit 3 is closed, and then produces protective effect.Specifically:
1, during no water flow signal: the 5th pin (positive input terminal) of comparer N6B is the datum input end, and through the 4th resistance R 49 and the 5th resistance R 50 dividing potential drops, the two resistance is equal, and then the 5th pin level is 1/2VCC.The 6th pin (negative input end) of comparer N6B is the detection signal input end, and when not having water flow signal, the first triode V33 ends, and first resistance R, 48 1 pin break off over the ground.VCC is through 25 chargings of 52 pairs first capacitor C of the 3rd resistance R; Make the positive terminal level of the capacitor C 25 of winning become height after being full of; Then make comparer N6B the 6th pin also be high level; Because the 6th pin is negative input end, and level is higher than the 5th pin level (1/2VCC), so that output terminal the 7th pin of comparer N6B is output as low level signal.The output of comparer N6B the 7th pin is connected to the input end of the first reverse drive amplifier D2A; The output that is about to monostable holding circuit 2 seals in main solenoid valve driving circuit 3 (this circuit is made up of the P05 mouth of single-chip microcomputer 4, the second reverse drive amplifier D3B, the first reverse drive amplifier D2A, the second diode V12, the 8th resistance R 60, the 9th resistance R 61, the second triode V9, the 3rd diode V14); When comparer N6B is output as low level; The 1st pin of the first reverse drive amplifier D2A is also pulled into low level; Because the reverse characteristic of the first reverse drive amplifier D2A; Make the first reverse drive amplifier D2A export the 16th pin and become high level, because the unidirectional conduction of the second diode V12, make the second diode V12 can not conducting; Through after the second diode V12, the 9th resistance R 61 the second triode V9 being ended, do not export thereby drive threshold voltage.Because monostable holding circuit 2 is not when having water flow signal, this circuit output signal guarantees that main solenoid valve Drive and Control Circuit 3 closes; At this moment; Even if single-chip microcomputer 4 lost efficacy, the vicious drive signal output of P05 mouth line also can't make the second triode V9 open; When having avoided, cause the dry combustion method of water heater when not having water flow signal owing to single-chip microcomputer 4 actual effects.
When 2, water flow signal being arranged: behind the current ingoing stream quantity sensor cavity, promote the impeller rotation, the magnet that links to each other with impeller; Also rotation simultaneously; Form the magnetic field that changes, at this moment give the two ends energising of Hall element, the Hall element after the energising produces induced electromotive force in the magnetic field that changes; This signal has obtained a square-wave signal at the output terminal (collector of triode V32) of the 3rd triode V32 after the shaping of water flow signal testing circuit 1, processing and amplifying.This discharge square-wave signal makes the first triode V33 conducting after through second resistance R 47, second capacitor C 28, the first diode V10; And the resistance of the 3rd resistance R 52 is 1M Ω, and the resistance R48 of first resistance is 100 Ω, and the 3rd resistance R 52 is far longer than the resistance of first resistance R 48; The first triode V33 conducting pulls into low level with the 6th pin (negative input end) of comparer N6B; At this moment because first capacitor C 25 has been stored energy, need slowly discharge, just make the level of the 6th pin (negative input end) of comparer N6B slowly descend through first resistance R 48, the first triode V33; The 5th pin (positive input terminal) datum of comparer N6B is constant; So that output terminal the 7th pin of comparer N6B output high level signal, when comparer N6B is output as high level, the 1st pin of the first reverse drive amplifier D2A is also pulled into high level; Because the reverse characteristic of the first reverse drive amplifier D2A; Make the first reverse drive amplifier D2A export the 16th pin and become low level, because the unidirectional conduction of the second diode V12 makes the second diode V12 conducting; And then make the second triode V9 conducting, then make this monostable holding circuit 2 no longer influence the control of 4 pairs of main solenoid valve driving circuits 3 of single-chip microcomputer.Water flow signal testing circuit 1 is connected with main solenoid valve Drive and Control Circuit 3 through single-chip microcomputer 4; The output terminal of the 3rd triode V32 produces the discharge square-wave signal and acts on single-chip microcomputer; Single-chip microcomputer has been sensed the current water heater of intaking; Single-chip microcomputer sends signal and gives main solenoid valve Drive and Control Circuit 3, and control main solenoid valve driving circuit is opened, and starts water heater.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection domain of the utility model.
Claims (4)
1. water heater automatic control circuit; Comprise water flow signal testing circuit, main solenoid valve Drive and Control Circuit and single-chip microcomputer; Said water flow signal testing circuit is connected with the main solenoid valve Drive and Control Circuit through single-chip microcomputer; It is characterized in that: said water heater automatic control circuit also comprises the monostable holding circuit, and said water flow signal testing circuit is connected with the main solenoid valve Drive and Control Circuit through the monostable holding circuit.
2. water heater automatic control circuit according to claim 1; It is characterized in that: said monostable holding circuit comprises comparer (N6B) and first triode (V33); The negative input end of said comparer (N6B) is connected with power supply through the 3rd resistance (R52) respectively; And be connected with the collector of first triode (V33) through first resistance (R48), the grounded emitter of first triode (V33), said the 3rd resistance (R52) is greater than the resistance of first resistance (R48); The negative input end of comparer (N6B) also is connected with the positive terminal of first electric capacity (C25); The negative pole end ground connection of said first electric capacity (C25), it is high level or low level that the break-make of controlling first triode (V33) collector and emitter through external signal can make the negative input end of comparer (N6B), the positive input terminal of said comparer (N6B) is connected with power supply through the 4th resistance (R49); And through the 5th resistance (R50) ground connection, the 4th resistance (R49) is identical with the resistance of the 5th resistance (R50).
3. water heater automatic control circuit according to claim 1; It is characterized in that: comprise the 3rd triode (V32) in the said water flow signal testing circuit, the collector of said the 3rd triode (V32) is connected with the base stage of first triode (V33) through second resistance (R47), second electric capacity (C28) in the monostable holding circuit successively.
4. water heater automatic control circuit according to claim 1; It is characterized in that: said main solenoid valve Drive and Control Circuit comprises the first reverse drive amplifier (D2A), and the input end of the first reverse drive amplifier (D2A) is connected with the output terminal of comparer (N6B) in the monostable holding circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220108446 CN202615164U (en) | 2012-03-21 | 2012-03-21 | Water heater automatic control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220108446 CN202615164U (en) | 2012-03-21 | 2012-03-21 | Water heater automatic control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202615164U true CN202615164U (en) | 2012-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220108446 Expired - Fee Related CN202615164U (en) | 2012-03-21 | 2012-03-21 | Water heater automatic control circuit |
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| CN (1) | CN202615164U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102591243A (en) * | 2012-03-21 | 2012-07-18 | 成都前锋电子有限责任公司 | Automatic control circuit of water heater |
| CN110307379A (en) * | 2019-07-25 | 2019-10-08 | 深圳市享往科技有限公司 | A kind of safety circuit and gas heater |
| CN112229873A (en) * | 2020-09-29 | 2021-01-15 | 宁波方太厨具有限公司 | Detection apparatus for anode rod consumes among water heater and water heater |
-
2012
- 2012-03-21 CN CN 201220108446 patent/CN202615164U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102591243A (en) * | 2012-03-21 | 2012-07-18 | 成都前锋电子有限责任公司 | Automatic control circuit of water heater |
| CN110307379A (en) * | 2019-07-25 | 2019-10-08 | 深圳市享往科技有限公司 | A kind of safety circuit and gas heater |
| CN112229873A (en) * | 2020-09-29 | 2021-01-15 | 宁波方太厨具有限公司 | Detection apparatus for anode rod consumes among water heater and water heater |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CHENGDU QIANFENG ELECTRONIC APPLIANCES GROUP CO., Free format text: FORMER OWNER: CHENGDU QIANFENG ELECTRONICS CO., LTD. Effective date: 20130719 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130719 Address after: Chenghua District Green Road 611731 Chengdu City, Sichuan province two No. 2 Patentee after: Chengdu Chiffo Electronics (Group) Co., Ltd. Address before: 611731 Chengdu province high tech West Road, No. 79, South Road, Sichuan Patentee before: Chengdu Qianfeng Electronics Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20210321 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |