CN105406443A - Instantaneous electric water heater dry heating prevention detection protection circuit - Google Patents
Instantaneous electric water heater dry heating prevention detection protection circuit Download PDFInfo
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- CN105406443A CN105406443A CN201510765319.8A CN201510765319A CN105406443A CN 105406443 A CN105406443 A CN 105406443A CN 201510765319 A CN201510765319 A CN 201510765319A CN 105406443 A CN105406443 A CN 105406443A
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Abstract
The invention discloses an instantaneous electric water heater dry heating prevention detection protection circuit, and belongs to the field of high-power instantaneous electric water heaters. The instantaneous electric water heater dry heating prevention detection protection circuit comprises a detection control circuit, a heating control circuit, a master control chip and a 12V power supply module. The detection control circuit comprises a three-phase bridge circuit, a dry heating prevention detection circuit, a dry heating prevention protection circuit and a three-phase AC contactor. The objective is to give a dry heating prevention detection and control circuit for the three-phase (380V) and single-phase electric heating systems of the instantaneous electric water heater. When the phenomenon of dry heating occurs, a three-phase general power supply can be instantaneously disconnected so that occurrence of the phenomenon of dry heating can be effectively prevented, safety of the high-power instantaneous electric water heater in the working process can be guaranteed, and the service life of the high-power instantaneous electric water heater can be prolonged.
Description
Technical field
The invention belongs to high-power instant-heating electric water heater field.
Background technology
High-power instant-heating electric water heater is very fragile in face of dry combustion method, generally will be damaged in several minutes under dry-fire condition, and serious quality accident occurs.The main manifestations of heating wire water heater is booster and fracture of wire.Therefore dry combustion method is the main reason of high-power instant-heating electric water heater generation quality problems.In the quality problems that all high-power instant-heating electric water heaters occur, have over half be because dry combustion method caused by, and the quality problems caused by dry combustion method are not generally minor issues, its directtissima be the heart (heating element) of high-power instant-heating electric water heater, therefore once cause high-power instant-heating electric water heater generation quality problems because of dry combustion method, so this high-power instant-heating electric water heater just whole subscription rate at last substantially.Therefore say that dry combustion method is the No.1 natural enemy of high-power instant-heating electric water heater, have a strong impact on quality and the useful life of high-power instant-heating electric water heater.
Summary of the invention
The object of the invention is the three-phase electricity (380V) for instant-heating electric water heater and single-phase electricity heating system, provide anti-dry detection and control circuit.
For achieving the above object, the present invention adopts following technical scheme: instant-heating electric water heater anti-dry detects protective circuit, it is characterized in that: comprise detection control circuit, heating control circuit, main control chip, power module, electrical heating wire, described detection control circuit comprises bridge circuit, anti-dry testing circuit, anti-dry protective circuit and three-phase ac contactor, described anti-dry testing circuit comprises current-limiting resistance and photoelectrical coupler, described photoelectrical coupler is connected by the output of current-limiting resistance with described bridge circuit, the output of described photoelectrical coupler is connected with the detection input of described main control chip, described anti-dry protective circuit comprises thermal circuit beraker, relay and control triode, the input of described thermal circuit beraker connects power module, the output of thermal circuit beraker connects the coil input end of described relay, the collector electrode of the coil output connection control triode of relay, control the grounded emitter of triode, control the base stage of triode and be connected with the anti-dry control output end of described main control chip, the output of described bridge circuit is also connected with the coil control input end of three-phase ac contactor, the coil control output end of three-phase ac contactor is connected with the common of relay, the normally-closed contact of described relay is connected with the output of bridge circuit, and described electrical heating wire is three-phase electricity heater strip or single-phase electricity heater strip.
Described heating control circuit comprises A phase electrical heating wire control circuit, B phase electrical heating wire control circuit and C phase electrical heating wire control circuit, the described input of A phase electrical heating wire control circuit is connected with the A phase output terminal contact of described three-phase ac contactor, the described input of B phase electrical heating wire control circuit is connected with the B phase output terminal contact of described three-phase ac contactor, the described input of C phase electrical heating wire control circuit is connected with the C phase output terminal contact of described three-phase ac contactor, the control end of described A phase electrical heating wire control circuit, the control end of B phase electrical heating wire control circuit, the control end of C phase electrical heating wire control circuit is all connected with the heating wire control output end of described main control chip, the detection output of A phase electrical heating wire control circuit, the detection output of B phase electrical heating wire control circuit, the detection output of C phase electrical heating wire control circuit is all connected with the input of described bridge circuit.
Described power module is 12V power module.
Described electrical heating wire is three-phase electricity heater strip, the A phase input of described three-phase electricity heater strip connects the output of described A phase electrical heating wire control circuit, the B phase input of three-phase electricity heater strip connects the output of described B phase electrical heating wire control circuit, and the C phase input of three-phase electricity heater strip connects the output of described C phase electrical heating wire control circuit.
Described electrical heating wire is single-phase electricity heater strip, and the live wire input of described single-phase electricity heater strip connects the output of described A phase electrical heating wire control circuit, and the zero line input of described single-phase electricity heater strip connects the output of described B phase electrical heating wire control circuit.
Instant-heating electric water heater anti-dry detection protective circuit of the present invention is that a kind of anti-dry of the three-phase electricity (380V) and single-phase electricity heating system that are applicable to instant-heating electric water heater detects protective circuit, when there being dry combustion method phenomenon to occur, the present invention adopts multiple protective circuit, i.e. three-phase ac contactor protection, the thermal circuit beraker protection of anti-dry protective circuit and the control end protection of anti-dry protective circuit, can instantaneous trip three-phase electricity general supply, the generation of effective pre-anti-dry phenomenon, ensure the fail safe in the course of the work of high-power instant-heating electric water heater and extend useful life of high-power instant-heating electric water heater.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the embodiment of the present invention 1;
Fig. 2 is the circuit theory diagrams of the embodiment of the present invention 2.
Embodiment
Embodiment 1:
Instant-heating electric water heater anti-dry as shown in Figure 1 detects protective circuit, and comprise detection control circuit, heating control circuit, main control chip, power module and electrical heating wire, described power module is 12V power module (power module is not shown).Described detection control circuit comprises bridge circuit, anti-dry testing circuit, anti-dry protective circuit and three-phase ac contactor CN13, described anti-dry testing circuit comprises current-limiting resistance R89 and photoelectrical coupler IC7, described photoelectrical coupler IC7 is connected with the output of described bridge circuit by current-limiting resistance R89, and the output of described photoelectrical coupler IC7 is connected with the detection input of described main control chip MCU; Described anti-dry protective circuit comprises thermal circuit beraker CN14, relay K 1 and controls triode N2, the input of described thermal circuit beraker CN14 connects described power module, the coil input end of relay K 1 described in the output termination of described thermal circuit beraker CN14, the coil output of described relay K 1 connects the collector electrode controlling triode N2, control the grounded emitter of triode N2, the base stage controlling triode N2 is connected with the anti-dry control output end of described main control chip MCU; The output of described bridge circuit is also connected with the coil control input end of described three-phase ac contactor CN13, the coil control output end of described three-phase ac contactor CN13 is connected with the common of described relay K 1, and the normally-closed contact of described relay K 1 is connected with the output of described bridge circuit.
Described heating control circuit comprises A phase electrical heating wire control circuit, B phase electrical heating wire control circuit and C phase electrical heating wire control circuit, the described input of A phase electrical heating wire control circuit is connected with the A phase output terminal contact of described three-phase ac contactor CN13, the described input of B phase electrical heating wire control circuit is connected with the B phase output terminal contact of described three-phase ac contactor CN13, the described input of C phase electrical heating wire control circuit is connected with the C phase output terminal contact of described three-phase ac contactor CN13, the control end of described A phase electrical heating wire control circuit, the control end of B phase electrical heating wire control circuit, the control end of C phase electrical heating wire control circuit is connected with the heating wire control output end of described main control chip MCU respectively, the detection output of A phase electrical heating wire control circuit, the detection output of B phase electrical heating wire control circuit, the detection output of C phase electrical heating wire control circuit is all connected with the input of described bridge circuit,
Described electrical heating wire is three-phase electricity heater strip, the A phase input of described three-phase electricity heater strip connects the output of described A phase electrical heating wire control circuit, the B phase input of three-phase electricity heater strip connects the output of described B phase electrical heating wire control circuit, and the C phase input of three-phase electricity heater strip connects the output of described C phase electrical heating wire control circuit.
After instant-heating electric water heater switches on power, after Master control chip MCU electrification reset, anti-dry control output end exports high level, now the temperature of instant-heating electric water heater does not exceed certain value (80 degree) and thermal circuit beraker CN14 is in closure state (resistance is 0 Europe), now control triode N2 conducting, relay K 1 coil electricity, its public electric shock is connected with often opening, and the coil of A.C. contactor CN13 is not powered, be in "on" position, at this moment three-phase electricity connects heating control circuit by the ac contactor point of A.C. contactor CN13, after discharge reaches startup warmed-up flow, main control chip MCU can control heating control circuit and start heating.
In the process of heating, anti-dry testing circuit in detection control circuit can carry out Real-Time Monitoring by bridge circuit to heating control circuit, now the output port of detection control circuit exports high level signal, the detection input of main control chip MCU detects this high level and judges that system heating is in normal condition, otherwise judges that heating system goes wrong;
When in the instant-heating electric water heater normal heating course of work, thermal circuit beraker (CN14) place detects that temperature is more than 80 degree, its resistance can become infinitely great, relay K 1 coil blackout instantaneously, and public electric shock is connected with normal-closed end, the coil of now A.C. contactor (CN13) there is electric current to flow through, trip immediately, be in off-state, now the total electricity of machine is closed, stop and continue heating, prevent dry-fire condition from occurring.
In addition, in the instant-heating electric water heater normal heating course of work, when main control chip MCU detects discharge lower than startup warmed-up flow, anti-dry control output end output low level immediately, the state variation normally off of relay K 1, now A.C. contactor (CN13) there is electric current to flow through, trip immediately, be in off-state, now the total electricity of machine is closed, stop and continue heating, prevent dry-fire condition from occurring;
After A.C. contactor CN13 trips, the power supply of instant-heating electric water heater is cut off, and protection machine is burned; now need the every assembly of inspection machine whether normal; confirm all normally, need to press the reset key on A.C. contactor CN13, A.C. contactor CN13 recovers original normally off.
Embodiment 2:
Instant-heating electric water heater anti-dry as shown in Figure 2 detects protective circuit; difference from Example 1 is: described electrical heating wire is single-phase electricity heater strip; the live wire input of described single-phase electricity heater strip connects the output of described A phase electrical heating wire control circuit, and the zero line input of described single-phase electricity heater strip connects the output of described B phase electrical heating wire control circuit.
Claims (4)
1. instant-heating electric water heater anti-dry detects protective circuit, it is characterized in that: comprise detection control circuit, heating control circuit, main control chip, power module and electrical heating wire, described detection control circuit comprises bridge circuit, anti-dry testing circuit, anti-dry protective circuit and three-phase ac contactor, described anti-dry testing circuit comprises current-limiting resistance and photoelectrical coupler, described photoelectrical coupler is connected by the output of current-limiting resistance with described bridge circuit, and the output of described photoelectrical coupler is connected with the detection input of described main control chip, described anti-dry protective circuit comprises thermal circuit beraker, relay and control triode, the input of described thermal circuit beraker connects power module, the output of thermal circuit beraker connects the coil input end of described relay, the collector electrode of the coil output connection control triode of relay, control the grounded emitter of triode, control the base stage of triode and be connected with the anti-dry control output end of described main control chip, the output of described bridge circuit is also connected with the coil control input end of three-phase ac contactor, the coil control output end of three-phase ac contactor is connected with the common of relay, the normally-closed contact of described relay is connected with the output of bridge circuit, described electrical heating wire is three-phase electricity heater strip or single-phase electricity heater strip, described heating control circuit comprises A phase electrical heating wire control circuit, B phase electrical heating wire control circuit and C phase electrical heating wire control circuit, the described input of A phase electrical heating wire control circuit is connected with the A phase output terminal contact of described three-phase ac contactor, the described input of B phase electrical heating wire control circuit is connected with the B phase output terminal contact of described three-phase ac contactor, the described input of C phase electrical heating wire control circuit is connected with the C phase output terminal contact of described three-phase ac contactor, the control end of described A phase electrical heating wire control circuit, the control end of B phase electrical heating wire control circuit, the control end of C phase electrical heating wire control circuit is all connected with the heating wire control output end of described main control chip, the detection output of A phase electrical heating wire control circuit, the detection output of B phase electrical heating wire control circuit, the detection output of C phase electrical heating wire control circuit is all connected with the input of described bridge circuit.
2. instant-heating electric water heater anti-dry as claimed in claim 1 detects protective circuit, it is characterized in that: described power module is 12V power module.
3. instant-heating electric water heater anti-dry as claimed in claim 1 detects protective circuit; it is characterized in that: described electrical heating wire is three-phase electricity heater strip; the A phase input of described three-phase electricity heater strip connects the output of described A phase electrical heating wire control circuit; the B phase input of three-phase electricity heater strip connects the output of described B phase electrical heating wire control circuit, and the C phase input of three-phase electricity heater strip connects the output of described C phase electrical heating wire control circuit.
4. instant-heating electric water heater anti-dry as claimed in claim 1 detects protective circuit; it is characterized in that: described electrical heating wire is single-phase electricity heater strip; the live wire input of described single-phase electricity heater strip connects the output of described A phase electrical heating wire control circuit, and the zero line input of described single-phase electricity heater strip connects the output of described B phase electrical heating wire control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510765319.8A CN105406443B (en) | 2015-11-11 | 2015-11-11 | Instant-heating electric water heater anti-dry detects protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510765319.8A CN105406443B (en) | 2015-11-11 | 2015-11-11 | Instant-heating electric water heater anti-dry detects protection circuit |
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| CN105406443A true CN105406443A (en) | 2016-03-16 |
| CN105406443B CN105406443B (en) | 2018-02-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106642720A (en) * | 2016-11-17 | 2017-05-10 | 佛山市云米电器科技有限公司 | Pre-induction type anti-dry burning structure of rapid water heating device |
| CN109780732A (en) * | 2019-01-21 | 2019-05-21 | 浙江传福电器有限公司 | Anti-dry instant electric water heater |
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| CN102444989A (en) * | 2011-12-08 | 2012-05-09 | 青岛海尔空调电子有限公司 | Water system auxiliary electrical heating temperature control system and control method |
| CN202442503U (en) * | 2012-01-25 | 2012-09-19 | 白树春 | Protection device of electric water heater |
| US20130134800A1 (en) * | 2011-11-25 | 2013-05-30 | Samsung Electronics Co., Ltd. | Power supply apparatus and control method thereof |
| CN103673300A (en) * | 2013-12-12 | 2014-03-26 | 深圳市北鼎晶辉科技股份有限公司 | Electric water heater water boiling and anti-dry-heating control method |
| CN203731704U (en) * | 2014-01-13 | 2014-07-23 | 芜湖美的厨卫电器制造有限公司 | Dry-burning-prevention device and electric water heater |
| CN205248769U (en) * | 2015-11-11 | 2016-05-18 | 无锡联力电子科技股份有限公司 | Instant heating electric water heater prevents that dry combustion method detects protection circuit |
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2015
- 2015-11-11 CN CN201510765319.8A patent/CN105406443B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20130134800A1 (en) * | 2011-11-25 | 2013-05-30 | Samsung Electronics Co., Ltd. | Power supply apparatus and control method thereof |
| CN102444989A (en) * | 2011-12-08 | 2012-05-09 | 青岛海尔空调电子有限公司 | Water system auxiliary electrical heating temperature control system and control method |
| CN202442503U (en) * | 2012-01-25 | 2012-09-19 | 白树春 | Protection device of electric water heater |
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| CN205248769U (en) * | 2015-11-11 | 2016-05-18 | 无锡联力电子科技股份有限公司 | Instant heating electric water heater prevents that dry combustion method detects protection circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106642720A (en) * | 2016-11-17 | 2017-05-10 | 佛山市云米电器科技有限公司 | Pre-induction type anti-dry burning structure of rapid water heating device |
| CN109780732A (en) * | 2019-01-21 | 2019-05-21 | 浙江传福电器有限公司 | Anti-dry instant electric water heater |
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| CN105406443B (en) | 2018-02-06 |
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