CN212132913U - Instant heating type temperature control circuit - Google Patents
Instant heating type temperature control circuit Download PDFInfo
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- CN212132913U CN212132913U CN201922421152.XU CN201922421152U CN212132913U CN 212132913 U CN212132913 U CN 212132913U CN 201922421152 U CN201922421152 U CN 201922421152U CN 212132913 U CN212132913 U CN 212132913U
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- control circuit
- triode
- temperature control
- limiting resistor
- current limiting
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Abstract
The utility model discloses an instant heating type temperature control circuit, including heating power control circuit, water pump flow control circuit, heating element, water pump, MCU, DC power supply and alternating current power supply, heating power control circuit includes relay circuit and silicon controlled rectifier circuit. The utility model is implemented, the instant heating can be realized, the heating power is adjusted through the relay circuit and the silicon controlled circuit, the multi-stage control of the power is satisfied, the working voltage of the water pump can be adjusted through the water pump flow control circuit 3, the control of the water outlet flow is further realized, and the stable instant heating is realized through setting the power and the water outlet flow; the relay circuit can also protect the heating circuit, thereby avoiding potential safety hazards.
Description
Technical Field
The utility model relates to a temperature control field especially relates to an instant heating type temperature control circuit.
Background
The electric water heater is a device for heating water by using electricity, meets various living needs of people, and becomes a necessary household appliance for every family.
However, the water heater is usually started in advance when hot water is needed, and people need to wait for a period of time when the hot water is urgently needed, so that the water heater is inconvenient.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an instant heating type temperature control circuit is provided, can realize instant heating safely effectively, reduce unnecessary energy resource consumption.
In order to solve the technical problem, the utility model provides an instant heating type temperature control circuit, which comprises a heating power control circuit, a water pump flow control circuit, a heating element, a water pump, a MCU, a DC power supply and an AC power supply, wherein the heating power control circuit comprises a relay circuit and a silicon controlled rectifier circuit; the relay circuit comprises a relay and a first triode, the base electrode of the first triode is connected with the MCU, the emitting electrode of the first triode is grounded, and the collecting electrode of the first triode is connected to the direct-current power supply through the coil of the relay; the controllable silicon circuit comprises a controllable silicon and a second triode, the anode of the controllable silicon is connected with an alternating current power supply, the cathode of the controllable silicon is connected with the heating element through the normally open end of the relay, the control electrode of the controllable silicon is connected with the collector of the second triode, the emitter of the second triode is grounded, and the base of the second triode is connected with the MCU; the water pump flow control circuit comprises a third triode and a first diode, the base of the third triode is connected with the MCU, the emitting electrode of the third triode is grounded, the collecting electrode of the third triode is connected with the direct-current power supply through the first diode, and the collecting electrode of the third triode is also connected with the water pump.
Preferably, the relay circuit further includes a second diode connected in parallel with the coil terminal of the relay.
Preferably, the silicon controlled rectifier circuit further comprises an optical coupler, and the optical coupler comprises a light emitter and a light receiver; one end of the light emitter is connected with a working power supply, and the other end of the light emitter is connected with a collector electrode of the second triode; one end of the light receiver is connected with the cathode of the controlled silicon, and the other end of the light receiver is connected with the control electrode of the controlled silicon.
Preferably, the thyristor circuit further comprises a first current limiting resistor, and the light receiver is connected with the control electrode of the thyristor through the first current limiting resistor.
Preferably, the thyristor circuit further comprises a second current limiting resistor, and the light receiver is connected with the cathode of the thyristor through the second current limiting resistor.
Preferably, the thyristor circuit further comprises a third current limiting resistor, and the light emitter is connected with the working power supply through the third current limiting resistor.
Preferably, the water pump flow control circuit further comprises a filter capacitor, one end of the filter capacitor is connected to a node between the third triode and the MCU, and the other end of the filter capacitor is grounded.
Preferably, the water pump flow control circuit further comprises a fourth current limiting resistor, and an emitter of the third triode is connected with a base of the third triode through the fourth current limiting resistor.
Preferably, the water pump flow control circuit further comprises a fifth current limiting resistor, and a base of the third triode is connected with the MCU through the fifth current limiting resistor.
Preferably, the optical coupler is a MOC 3021.
Implement the utility model has the advantages that:
the utility model provides an instant heating type temperature control circuit can realize the instant heating type heating, adjusts heating power through relay circuit and silicon controlled rectifier circuit, satisfies the multistage control of power, can adjust the operating voltage of water pump through water pump flow control circuit 3, and then realizes the control to the water flow, through setting up power and flow, realizes the instant heating type heating steadily; the relay circuit can also protect the heating circuit, thereby avoiding potential safety hazards.
Drawings
Fig. 1 is a block diagram of an instant heating type temperature control circuit provided by the present invention;
fig. 2 is a circuit diagram of a relay circuit provided by the present invention;
fig. 3 is a circuit diagram of the thyristor provided by the present invention;
fig. 4 is a circuit diagram of a flow control circuit of a water pump.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings. Only this statement, the utility model discloses the upper and lower, left and right, preceding, back, inside and outside etc. position words that appear or will appear in the text only use the utility model discloses an attached drawing is the benchmark, and it is not right the utility model discloses a concrete restriction.
As shown in fig. 1, the utility model provides an instant heating type temperature control circuit, including heating power control circuit 2, water pump flow control circuit 3, heating element 4, water pump 5, MCU1, DC power supply 7 and AC power supply 6, heating power control circuit 2 includes relay circuit 202 and silicon controlled rectifier circuit 201.
As shown in fig. 2, the relay circuit 202 includes a relay K2 and a first transistor Q2, a base of the first transistor Q2 is connected to the MCU (JR terminal), an emitter of the first transistor Q2 is grounded, and a collector of the first transistor Q2 is connected to the dc power supply (24V) through a coil (pins 2 and 4) of the relay K2.
As shown in fig. 3, the SCR circuit 201 includes a SCR1 and a second transistor Q7, an anode T1 of the SCR1 is connected to an alternating current (AC-L) power supply, a cathode T2 of the SCR1 is connected to the heating element HEAT through a normally open end (pins 1 and 5) of the relay K2, a control electrode G of the SCR1 is connected to a collector of the second transistor Q7, an emitter of the second transistor Q7 is grounded, and a base of the second transistor Q7 is connected to the MCU (thyristor port).
The utility model discloses, MCU can realize 200W to 1200W multistage heating control through adjusting PWM duty ratio control second triode Q7's on-time. The relay control circuit can protect the SCR from direct connection when the SCR fails due to overheating. It should be noted that, when heating is started, the MCU firstly sets the JR port to a high level, the first transistor Q2 is turned on, the relay K2 is turned on, the coil is energized, the normally open end (pins 1 and 5) is switched to a closed state, the thyristor port is set to a high level, the second transistor Q7 is turned on, the thyristor is turned on, and the ac power supply supplies power to the heating element to start heating. When stopping heating, MCU is preferred to be the low level through setting up the JR port, first triode Q2 ends, relay K2, the coil outage electricity, and the end of opening a way (1 and 5 pins) get back to the open circuit state normally, and heating element stops heating, and MCU rethread sets up the silicon controlled rectifier port and is the low level, closes the heating and accomplishes, closes the relay earlier usually and then delays time 1 second and closes the silicon controlled rectifier, can prevent that the relay from producing the spark.
As shown in fig. 4, the water PUMP flow control circuit 3 includes a third transistor Q4 and a first diode D7, a base of the third transistor Q4 is connected to the MCU (XH-PUMP port), an emitter of the third transistor Q4 is grounded, a collector of the third transistor Q4 is connected to a dc power supply (24V) through the first diode D7, and a collector of the third transistor Q4 is further connected to the water PUMP.
The utility model discloses, MCU is through adjusting output PWM duty cycle size, controls third triode Q4's on-time, and then changes diode M7 both ends voltage, the flow of control water pump.
It should be noted that, when Δ T is T, T is set as temperature-T tank temperature, M is flow rate, W is heating power, and when Δ T, M and W satisfy the following temperature control test: and M is W/(4.18 Δ T), the temperature control effect of the instant heating type temperature control circuit is best, and the instant heating type requirement can be met.
Preferably, the relay circuit 202 further includes a second diode D11, the second diode D11 being connected in parallel with the coil terminals (pins 2 and 4) of the relay K2. The second diode D11 is used for protecting the first transistor Q2.
More preferably, the silicon controlled rectifier circuit 201 further comprises an optical coupler U4, and the optical coupler U4 comprises a light emitter and a light receiver; one end of the light emitter is connected with a working power supply (+5V), and the other end of the light emitter is connected with a collector of the second triode Q7; one end of the light receiver is connected with a cathode T2 of the controlled silicon SCR1, and the other end of the light receiver is connected with a control electrode G of the controlled silicon SCR 1. The opto-coupler U4 is MOC302, adopts opto-coupler U4, can realize instant trigger silicon controlled rectifier, can also protect the silicon controlled rectifier simultaneously.
Preferably, the thyristor circuit 201 further includes a first current limiting resistor R36, and the light receiver is connected to the gate G of the thyristor SCR1 through the first current limiting resistor R36. The thyristor circuit 201 further comprises a second current limiting resistor R35, and the light receiver is connected with a cathode T2 of the thyristor SCR1 through the second current limiting resistor R35. The thyristor circuit 201 further comprises a third current limiting resistor R34, and the light emitter is connected to a working power supply (+5V) through the third current limiting resistor R34.
Preferably, the water pump flow control circuit 3 further includes a filter capacitor C8, one end of the filter capacitor C8 is connected to a node between the third triode Q4 and the MCU, and the other end is grounded. The filter capacitor C8 filters out the interference signal generated by the pump under the pump switch state, and prevents the malfunction of the single chip microcomputer.
Preferably, the water pump flow control circuit 3 further includes a fourth current limiting resistor R15, and an emitter of the third transistor Q4 is connected to a base of the third transistor Q4 through the fourth current limiting resistor R15. Further, the water pump flow control circuit 3 further includes a fifth current limiting resistor R23, and the base of the third triode Q4 is connected to the MCU through the fifth current limiting resistor R23. R15 and R23 prevent level switching from breaking through the third transistor Q4.
To sum up, the instant heating type temperature control circuit provided by the utility model can realize new instant heating type heating, adjust the heating power through the relay circuit 202 and the silicon controlled circuit 201, satisfy the multilevel control of power, can adjust the working voltage of the water pump through the water pump flow control circuit 3, and then realize the control of the water outlet flow, and realize the stable instant heating through setting up the relation of delta T, M and W; the relay circuit 202 can also protect the heating circuit, avoiding potential safety hazards.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (10)
1. An instant heating type temperature control circuit is characterized by comprising a heating power control circuit, a water pump flow control circuit, a heating element, a water pump, an MCU (microprogrammed control unit), a direct current power supply and an alternating current power supply, wherein the heating power control circuit comprises a relay circuit and a silicon controlled rectifier circuit;
the relay circuit comprises a relay and a first triode, the base electrode of the first triode is connected with the MCU, the emitting electrode of the first triode is grounded, and the collecting electrode of the first triode is connected to the direct-current power supply through the coil of the relay;
the controllable silicon circuit comprises a controllable silicon and a second triode, the anode of the controllable silicon is connected with an alternating current power supply, the cathode of the controllable silicon is connected with the heating element through the normally open end of the relay, the control electrode of the controllable silicon is connected with the collector of the second triode, the emitter of the second triode is grounded, and the base of the second triode is connected with the MCU;
the water pump flow control circuit comprises a third triode and a first diode, the base of the third triode is connected with the MCU, the emitting electrode of the third triode is grounded, the collecting electrode of the third triode is connected with the direct-current power supply through the first diode, and the collecting electrode of the third triode is also connected with the water pump.
2. The tankless temperature control circuit of claim 1, further comprising a second diode connected in parallel with a coil terminal of said relay.
3. The tankless temperature control circuit of claim 1, further comprising an optocoupler, said optocoupler comprising a light emitter and a light receiver;
one end of the light emitter is connected with a working power supply, and the other end of the light emitter is connected with a collector electrode of the second triode;
one end of the light receiver is connected with the cathode of the controlled silicon, and the other end of the light receiver is connected with the control electrode of the controlled silicon.
4. The tankless temperature control circuit of claim 3, further comprising a first current limiting resistor, wherein said light receptor is connected to said thyristor control electrode through said first current limiting resistor.
5. The tankless temperature control circuit of claim 3, further comprising a second current limiting resistor, wherein said light receptor is connected to the cathode of said thyristor through said second current limiting resistor.
6. The tankless temperature control circuit of claim 3, further comprising a third current limiting resistor, wherein said light emitter is connected to an operating power source through said third current limiting resistor.
7. The tankless temperature control circuit of claim 1, further comprising a filter capacitor, wherein one end of said filter capacitor is connected to a node between said third transistor and said MCU, and the other end of said filter capacitor is grounded.
8. The tankless temperature control circuit of claim 1, further comprising a fourth current limiting resistor, wherein an emitter of said third transistor is connected to a base of said third transistor through said fourth current limiting resistor.
9. The tankless temperature control circuit of claim 1, further comprising a fifth current limiting resistor, wherein the base of said third transistor is connected to said MCU via said fifth current limiting resistor.
10. The instant heating type temperature control circuit according to any one of claims 3 to 6, wherein the optocoupler is MOC 3021.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922421152.XU CN212132913U (en) | 2019-12-27 | 2019-12-27 | Instant heating type temperature control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922421152.XU CN212132913U (en) | 2019-12-27 | 2019-12-27 | Instant heating type temperature control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212132913U true CN212132913U (en) | 2020-12-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922421152.XU Active CN212132913U (en) | 2019-12-27 | 2019-12-27 | Instant heating type temperature control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212132913U (en) |
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2019
- 2019-12-27 CN CN201922421152.XU patent/CN212132913U/en active Active
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