CN105406443B - Instant-heating electric water heater anti-dry detects protection circuit - Google Patents
Instant-heating electric water heater anti-dry detects protection circuit Download PDFInfo
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- CN105406443B CN105406443B CN201510765319.8A CN201510765319A CN105406443B CN 105406443 B CN105406443 B CN 105406443B CN 201510765319 A CN201510765319 A CN 201510765319A CN 105406443 B CN105406443 B CN 105406443B
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Abstract
The invention discloses instant-heating electric water heater anti-dry to detect protection circuit, belong to high-power instant-heating electric water heater field, including detecting control circuit, heating control circuit, main control chip and 12V power modules, the detection control circuit includes three-phase bridge circuit, anti-dry detects circuit, anti-dry protection circuit and three-phase ac contactor, purpose is the three-phase electricity (380V) and single-phase electric heating system for instant-heating electric water heater, provide anti-dry detection and control circuit, when there is the generation of dry combustion method phenomenon, the present invention can be with instantaneous trip three-phase electricity general supply, the generation of effective pre- anti-dry phenomenon, ensure the security of high-power instant-heating electric water heater in the course of the work and extend the service life of high-power instant-heating electric water heater.
Description
Technical field
The invention belongs to high-power instant-heating electric water heater field.
Background technology
High-power instant-heating electric water heater be in face of dry combustion method it is very fragile, will in several minutes typically under dry-fire condition
It is damaged, serious quality accident occurs.The main performance of heating wire water heater is booster and fracture of wire.Therefore dry combustion method is high-power
The main reason of quality problems occurs for instant-heating electric water heater.In the quality problems that all high-power instant-heating electric water heaters are occurred
In, there is more than half because of caused by dry combustion method, and it is not minor issue that the quality problems as caused by dry combustion method are general, and it is straight
Connect attack is the heart (heating element) of high-power instant-heating electric water heater, therefore once causes a high-power i.e. heat because of dry combustion method
Quality problems occur for electric heater, then this high-power instant-heating electric water heater substantially just whole subscription rate at last.Therefore say
Dry combustion method is the No.1 natural enemy of high-power instant-heating electric water heater, has a strong impact on the quality and service life of high-power instant-heating electric water heater.
The content of the invention
The purpose of the present invention is the three-phase electricity (380V) and single-phase electric heating system for instant-heating electric water heater, is provided anti-dry
Burn detection and control circuit.
To achieve the above object, the present invention adopts the following technical scheme that：Instant-heating electric water heater anti-dry detects protection circuit,
It is characterized in that：Including detection control circuit, heating control circuit, main control chip, power module, electrical heating wire, the detection
Control circuit includes bridge circuit, anti-dry detection circuit, anti-dry protection circuit and three-phase ac contactor, the anti-dry
Detection circuit includes current-limiting resistance and photoelectrical coupler, and the photoelectrical coupler is defeated by current-limiting resistance and the bridge circuit
Go out end connection, the output end of the photoelectrical coupler is connected with the detection input of the main control chip；The anti-dry protection
Circuit includes thermal circuit beraker, relay and control triode, the input connection power module of the thermal circuit beraker, thermal circuit beraker
Output end connect the coil input end of the relay, the colelctor electrode of the coil output connection control triode of relay,
The grounded emitter of triode is controlled, controls the base stage of triode to be connected with the anti-dry control output end of the main control chip；
The output end of the bridge circuit is also connected with the coil control signal of three-phase ac contactor, the line of three-phase ac contactor
The common for enclosing control output end and relay connects, and the normally-closed contact of the relay and the output end of bridge circuit connect
Connect, the electrical heating wire is three-phase electrical heating wire or single-phase electrical heating wire.
The heating control circuit includes A phase electrical heating wires control circuit, B phase electrical heating wire control circuits add with C phases electricity
Heated filament control circuit, the A phase output terminals of the input and the three-phase ac contactor of the A phases electrical heating wire control circuit touch
Point connection, the input of the B phases electrical heating wire control circuit and the B phase output terminals contact of the three-phase ac contactor connect
Connect, the C phase output terminal contact portions of the input of the C phases electrical heating wire control circuit and the three-phase ac contactor, institute
State the control terminal of A phase electrical heating wire control circuits, the control terminal of B phase electrical heating wire control circuits, C phase electrical heating wire control circuits
Control terminal be connected with the heating wire control output end of the main control chip, the detections of A phase electrical heating wire control circuits output
End, the detection output of B phase electrical heating wire control circuits, the detection output of C phase electrical heating wire control circuits with the bridge
The input connection of formula circuit.
The power module is 12V power modules.
The electrical heating wire is three-phase electrical heating wire, and the A phases input of the three-phase electrical heating wire connects the A phases electricity and added
The output end of heated filament control circuit, the B phases input of three-phase electrical heating wire connect the output of the B phases electrical heating wire control circuit
End, the C phases input of three-phase electrical heating wire connect the output end of the C phases electrical heating wire control circuit.
The electrical heating wire is single-phase electrical heating wire, and the live wire input of the single-phase electrical heating wire connects the A phases electricity
The output end of heating strip control circuit, the zero line input of the single-phase electrical heating wire connect the B phases electrical heating wire control electricity
The output end on road.
Instant-heating electric water heater anti-dry of the present invention detection protection circuit is a kind of to be applied to instant-heating electric water heater
The anti-dry of three-phase electricity (380V) and single-phase electric heating system detects protection circuit, and when there is the generation of dry combustion method phenomenon, the present invention adopts
With multiple protective circuit, i.e. three-phase ac contactor is protected, the thermal circuit beraker protection and anti-dry protection of anti-dry protection circuit
The control terminal protection of circuit, the generation of effective pre- anti-dry phenomenon, it can be ensured high-power with instantaneous trip three-phase electricity general supply
The security of instant-heating electric water heater in the course of the work and the service life for extending high-power instant-heating electric water heater.
Brief description of the drawings
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 detection protection circuit as shown in Figure 1, including detection control circuit, computer heating control electricity
Road, main control chip, power module and electrical heating wire, the power module are 12V power modules (not shown in power module figure).
The detection control circuit includes bridge circuit, anti-dry detection circuit, anti-dry protection circuit and three-phase ac contactor
CN13, the anti-dry detection circuit includes current-limiting resistance R89 and photoelectrical coupler IC7, the photoelectrical coupler IC7 pass through limit
Leakage resistance R89 is connected with the output end of the bridge circuit, output end and the main control chip of the photoelectrical coupler IC7
MCU detection input connection；The anti-dry protection circuit includes thermal circuit beraker CN14, relay K1 and control triode
N2, the thermal circuit beraker CN14 input connect the power module, and the output of the thermal circuit beraker CN14 terminates the relay
K1 coil input end, the coil output of the relay K1 connect control triode N2 colelctor electrode, control triode N2's
Grounded emitter, control triode N2 base stage are connected with the anti-dry control output end of the main control chip MCU；The bridge-type
Coil control signal of the output end of circuit also with the three-phase ac contactor CN13 is connected, the three-phase ac contactor
CN13 coil control output end is connected with the common of the relay K1, the normally-closed contact of the relay K1 with it is described
The output end connection of bridge circuit.
The heating control circuit includes A phase electrical heating wires control circuit, B phase electrical heating wire control circuits add with C phases electricity
Heated filament control circuit, the A phases of the input and the three-phase ac contactor CN13 of the A phases electrical heating wire control circuit export
Terminal contacts connection, the input of the B phases electrical heating wire control circuit and the B phase output terminals of the three-phase ac contactor CN13
Contact portion, the C phase output terminals of input and the three-phase ac contactor CN13 of the C phases electrical heating wire control circuit touch
Point connection, the control terminal of the A phases electrical heating wire control circuit, the control terminal of B phase electrical heating wire control circuits, C phase electrical heating
Heating wire control output end of the control terminal of silk control circuit respectively with the main control chip MCU is connected, A phase electrical heating wire controls
The detection of the detection output of circuit processed, the detection output of B phase electrical heating wire control circuits, C phase electrical heating wire control circuits
Input of the output end with the bridge circuit is connected；
The electrical heating wire is three-phase electrical heating wire, and the A phases input of the three-phase electrical heating wire connects the A phases electricity and added
The output end of heated filament control circuit, the B phases input of three-phase electrical heating wire connect the output of the B phases electrical heating wire control circuit
End, the C phases input of three-phase electrical heating wire connect the output end of the C phases electrical heating wire control circuit.
After instant-heating electric water heater switches on power, after Master control chip MCU electrification resets, the output of anti-dry control output end
High level, now the temperature of instant-heating electric water heater is not above certain value (80 degree) and thermal circuit beraker CN14 is in closure state
(resistance is 0 Europe), now control triode N2 conductings, relay K1 coil electricities, its public electric shock and normally opened connection, and exchange
Contactor CN13 coil is not powered, in "on" position, the ac contactor point that at this moment three-phase electricity passes through A.C. contactor CN13
Heating control circuit is connected, after water-carrying capacity, which reaches, starts warmed-up flow, main control chip MCU can control heating control circuit to open
Dynamic heating.
During heating, the anti-dry detection circuit detected in control circuit can be controlled by bridge circuit to heating
Circuit processed is monitored in real time, now detects the output port output high level signal of control circuit, main control chip MCU detection
Input 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 temperature more than 80 degree,
Its resistance can become infinitely great, relay K1 coil blackouts moment, and public electric shock is connected with normal-closed end, and now exchange connects
There is electric current to flow through on the coil of tentaculum (CN13), trip, be off immediately, now machine is always electrically turn off, and prevents to continue
Heating, prevents dry-fire condition.
In addition, in the instant-heating electric water heater normal heating course of work, when main control chip MCU detects water-carrying capacity less than startup
During warmed-up flow, anti-dry control output end exports low level immediately, relay K1 state change normally off, now exchanges
There is electric current to flow through on contactor (CN13), trip, be off immediately, now machine is always electrically turn off, and prevention continues to heat,
Prevent dry-fire condition；
After A.C. contactor CN13 trips, the power supply of instant-heating electric water heater is cut off, and protection machine is burned, and is now needed
Want inspection machine items component whether normal, confirm it is all normal after, need to press the reset key on A.C. contactor CN13, hand over
Flow contactor CN13 and recover original normally off.
Embodiment 2：
Instant-heating electric water heater anti-dry detection protection circuit as shown in Figure 2, difference from Example 1 are：It is described
Electrical heating wire is single-phase electrical heating wire, and the live wire input of the single-phase electrical heating wire connects the A phases electrical heating wire control electricity
The output end on road, the zero line input of the single-phase electrical heating wire connect the output end of the B phases electrical heating wire control circuit.
Claims (4)
1. instant-heating electric water heater anti-dry detects protection circuit, it is characterised in that：Including detection control circuit, computer heating control electricity
Road, main control chip, power module and electrical heating wire, the detection control circuit include bridge circuit, anti-dry detection circuit, prevented
Dry combustion method protection circuit and three-phase ac contactor, the anti-dry detection circuit includes current-limiting resistance and photoelectrical coupler, described
Photoelectrical coupler is connected by current-limiting resistance with the output end of the bridge circuit, the output end of the photoelectrical coupler with it is described
The detection input connection of main control chip；The anti-dry protection circuit includes thermal circuit beraker, relay and control triode, institute
The input connection power module of thermal circuit beraker is stated, the output end of thermal circuit beraker connects the coil input end of the relay, after
The colelctor electrode of the coil output connection control triode of electrical equipment, controls the grounded emitter of triode, controls the base of triode
Pole is connected with the anti-dry control output end of the main control chip；The output end of the bridge circuit also with three-phase ac contactor
The connection of coil control signal, the common of the coil control output end of three-phase ac contactor and relay connects, institute
The output end of the normally-closed contact and bridge circuit of stating relay connects, and the electrical heating wire is that three-phase electrical heating wire or single-phase electricity add
Heated filament, the heating control circuit include A phase electrical heating wires control circuit, B phase electrical heating wire control circuits and C phase electrical heating wires
Control circuit, the input of the A phases electrical heating wire control circuit connect with the A phase output terminals contact of the three-phase ac contactor
Connect, the B phase output terminals contact portion of the input of the B phases electrical heating wire control circuit and the three-phase ac contactor, institute
State the input of C phase electrical heating wire control circuits and the C phase output terminal contact portions of the three-phase ac contactor, the A phases
The control of the control terminal of electrical heating wire control circuit, the control terminal of B phase electrical heating wire control circuits, C phase electrical heating wire control circuits
End processed is connected with the heating wire control output end of the main control chip, the detection output of A phase electrical heating wire control circuits, B
The detection output of phase electrical heating wire control circuit, the detection output of C phase electrical heating wire control circuits are electric with the bridge-type
The input connection on road.
2. instant-heating electric water heater anti-dry as claimed in claim 1 detects protection circuit, it is characterised in that：The power module
For 12V power modules.
3. instant-heating electric water heater anti-dry as claimed in claim 1 detects protection circuit, it is characterised in that：The electrical heating wire
For three-phase electrical heating wire, the A phases input of the three-phase electrical heating wire connects the output of the A phases electrical heating wire control circuit
End, the B phases input of three-phase electrical heating wire connect the output end of the B phases electrical heating wire control circuit, the C of three-phase electrical heating wire
Phase input connects the output end of the C phases electrical heating wire control circuit.
4. instant-heating electric water heater anti-dry as claimed in claim 1 detects protection circuit, it is characterised in that：The electrical heating wire
For single-phase electrical heating wire, the live wire input of the single-phase electrical heating wire connects the output of the A phases electrical heating wire control circuit
End, the zero line input of the single-phase electrical heating wire connect the output end of the B phases 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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105406443A CN105406443A (en) | 2016-03-16 |
| CN105406443B true CN105406443B (en) | 2018-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510765319.8A Active CN105406443B (en) | 2015-11-11 | 2015-11-11 | Instant-heating electric water heater anti-dry detects protection circuit |
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Families Citing this family (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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101977837B1 (en) * | 2011-11-25 | 2019-05-13 | 삼성전자주식회사 | Power supply device and control method thereof |
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2015
- 2015-11-11 CN CN201510765319.8A patent/CN105406443B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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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