Constant temperature control three-hole plug-in circuit

Abstract

The utility model provides a constant temperature control three-hole plug-in circuit. The constant temperature control three-hole plug-in circuit comprises a heating body and a controller, the heating body comprises an NTC (Negative Temperature Coefficient) induction line, an NTC layer and a PTC (Positive Temperature Coefficient) heating line; the controller comprises a fuse, a voltage stabilizing circuit, a user interface, a power supply voltage monitoring circuit, a synchronous signal circuit, an NTC voltage detection circuit, an NTC load detection circuit, a PTC load detection circuit, a silicon controlled rectifier, a reference resistor, a voltage sampling circuit, a microprocessor and a synchronous signal circuit. The controller is connected with the heating body in a three-wire butt joint mode.

Description

TECHNICAL FIELD

[0001] The utility model relates to constant temperature control technical field, concretely is a constant temperature control three hole pair insertion circuit. BACKGROUND

[0002] The design principle of the constant temperature control circuit combines the characteristics of PTC and NTC, realizing precise temperature control and overheat protection functions. Through the linear temperature variation coefficient of the PTC heating wire, precise control of temperature can be realized, ensuring stable operation of the equipment within the set temperature range. At the same time, using the sensitive change principle of the NTC local overheat resistance value, the overheat protection function is realized. When the equipment overheats, the NTC can sense the temperature change and lower the temperature to the safe range in time, effectively protecting the equipment and the user's safety. PTC and NTC complement each other, which can not only maintain constant temperature but also protect against overheating. Although the circuit design is ideal, the structure is complex, resulting in high overall cost, because there are usually interconnecting wires and connectors between the controller and the heating wire body. Based on the above situation, there are design schemes on the market that directly insert the controller into the blanket connector. This design is simple and practical, and is convenient for users to operate. However, most current designs use four-core or five-core pair insertion connection method, which has some problems. First, the four-core or five-core pair insertion connection method increases the complexity of the structure, which may increase the design and manufacturing cost of the connector. Second, this connection method may cause large resistance when plugging, making plugging operation difficult, and even possibly damaging the connector or controller. SUMMARY

[0003] (I) Technical problems solved

[0004] In view of the defects of the prior art, the utility model provides a constant temperature control three hole pair insertion circuit, which solves the problems that the four-core or five-core pair insertion connection method increases the complexity of the structure, which may increase the design and manufacturing cost of the connector. Second, this connection method may cause large resistance when plugging, making plugging operation difficult, and even possibly damaging the connector or controller.

[0005] (II) Technical solutions

[0006] To achieve the above purpose, the utility model realizes the following technical scheme: a constant temperature control three hole pair insertion circuit, comprising: a heating body and a controller;

[0007] The heating body comprises: an NTC sensing wire, an NTC layer and a PTC heating wire;

[0008] The controller comprises: a fuse, a voltage stabilizing circuit, a user interface, a power voltage monitoring circuit, a synchronous signal circuit, an NTC voltage detection circuit, an NTC load detection circuit, a PTC load detection circuit, a thyristor, a reference resistor, a voltage sampling circuit, a microprocessor, a synchronous signal circuit.

[0009] The controller is connected to the heat generator in a three-wire docking manner.

[0010] Preferably, the NTC induction line is connected head to tail, and any overheating can be fed back through the induction line.

[0011] Preferably, the controller is connected to the heat generator in a three-wire docking manner, specifically: AC H1 and HA, NTC voltage detection and load detection H2 and HB, and thyristor end H3 and HC are docked.

[0012] Preferably, the voltage stabilizing circuit comprises: half-wave rectifier diodes D1 and D6, a voltage stabilizing IC U2, filter capacitors C2 and C3, and voltage dividing resistors R1 and R28.

[0013] The half-wave rectifier diodes D1 and D6 are connected in series with the DR pin of the voltage stabilizing IC U2.

[0014] One end of the voltage dividing resistor R1 is connected to the SEL pin of the voltage stabilizing IC U2, and the other end is grounded.

[0015] One end of the voltage dividing resistor R28 is connected to the VOUT pin of the voltage stabilizing IC U2, and the other end is grounded.

[0016] One end of the filter capacitor C2 is connected to the VDD pin of the voltage stabilizing IC U2, and the other end is grounded.

[0017] One end of the filter capacitor C3 is connected to the VOUT pin of the voltage stabilizing IC U2, and the other end is grounded.

[0018] Preferably, the power voltage monitoring circuit comprises: voltage dividing resistors R4, R2, and R13, which are connected in series with one end connected to AC and the other end grounded.

[0019] Preferably, the synchronous signal circuit comprises: voltage dividing resistors R6 and R7, which are connected in series.

[0020] Preferably, the NTC voltage detection circuit comprises: voltage dividing resistors R14 and R15 and a filter capacitor C6.

[0021] The NTC voltage load detection circuit mainly comprises voltage dividing resistors R18 and R19.

[0022] Preferably, the PTC load detection circuit comprises: voltage dividing resistors R20 and R21.

[0023] Preferably, the silicon controlled circuit comprises: a bidirectional thyristor T1 heating, T2 protection.

[0024] (III) beneficial effects

[0025] The utility model provides a constant temperature control three hole pair plug circuit. Possess following beneficial effect: three wire butt joint relative four core or five core pair plug connection mode, connection structure is simpler, easy to design and manufacture, has reduced manufacturing cost. Since only three wires are connected, the resistance is relatively small when plugging, the user operation is more convenient, reduces the risk of damaging the connector or equipment, the constant temperature control three hole pair plug circuit structure is simple and clear, the connection mode is clear, has higher practicality and reliability, is suitable for the application scene that needs accurate temperature control and overheat protection. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 It is the utility model circuit frame diagram;

[0027] Fig. 2 It is the utility model circuit principle diagram. DETAILED DESCRIPTION

[0028] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model.

[0029] The utility model embodiment provides a constant temperature control three hole pair plug circuit, as Figs. 1-2 Shown, including: heating body and controller;

[0030] The heating body includes: NTC sensing wire, NTC layer and PTC heating wire;

[0031] The controller includes: fuse, voltage stabilizing circuit, user interface, power voltage monitoring circuit, synchronous signal circuit, NTC voltage detection circuit, NTC load detection circuit, PTC load detection circuit, thyristor, reference resistor, voltage sampling circuit, microprocessor, synchronous signal circuit;

[0032] The controller is connected with the heating body in three wire butt joint mode.

[0033] Preferably, the NTC sensing wire is connected at the head and tail, and any overheating can feed back impedance information through the sensing wire.

[0034] In the utility model scheme, the NTC sensing wire is connected at the head and tail, and any overheating can feed back impedance information through the sensing wire, and any disconnection of the sensing wire (the NTC layer inside the heating wire is equivalent to many resistors in parallel) does not affect the impedance information feedback of the sensing wire.

[0035] Preferably, the controller and the heating body are connected in a three-wire docking manner, specifically: AC H1 and HA, NTC voltage detection and load detection H2 and HB, and controllable silicon end H3 and HC docking.

[0036] Preferably, the voltage stabilizing circuit comprises: current limiting resistor R6, half-wave rectifier diode D1, D2, voltage stabilizing IC U2, filter capacitor C2, C3, voltage dividing resistor R7, R8;

[0037] The current limiting resistor R6, the half-wave rectifier diode D1, and the half-wave rectifier diode D6 are connected in series with the DR pin of the voltage stabilizing IC U2;

[0038] One end of the voltage dividing resistor R7 is connected to the SEL pin of the voltage stabilizing IC U2, and the other end is grounded;

[0039] One end of the voltage dividing resistor R8 is connected to the VOUT pin of the voltage stabilizing IC U2, and the other end is grounded;

[0040] One end of the filter capacitor C2 is connected to the VDD pin of the voltage stabilizing IC U2, and the other end is grounded;

[0041] One end of the filter capacitor C3 is connected to the VOUT pin of the voltage stabilizing IC U2, and the other end is grounded.

[0042] The voltage stabilizing circuit is used to provide stable power supply for the microprocessor MCU.

[0043] Preferably, the power voltage monitoring circuit comprises: voltage dividing resistors R3, R4, and R5 connected in series, one end connected to AC, and the other end grounded.

[0044] The power voltage monitoring circuit provides reference for the MCU when detecting temperature changes of the heating line.

[0045] Preferably, the synchronization signal circuit comprises: voltage dividing resistors R9 and R10 connected in series.

[0046] The synchronization signal circuit serves as a reference for the controllable silicon trigger signal waveform and the internal work of the MCU.

[0047] Preferably, the NTC voltage detection circuit comprises: voltage dividing resistors R14 and R15 and filter capacitor C6.

[0048] The NTC voltage detection circuit is used to detect changes in the NTC resistance value of the heating line to provide an over-temperature protection signal for the MCU.

[0049] The NTC voltage load detection circuit mainly comprises voltage dividing resistors R18 and R19.

[0050] The NTC voltage load detection circuit is used for sending an abnormal signal to the MCU for judgment when the NTC load is abnormal, and the MCU gives a fault prompt, which is safe and reliable.

[0051] Preferably, the PTC load detection circuit comprises voltage dividing resistors R20 and R21.

[0052] The PTC load detection circuit is used for sending an abnormal signal to the MCU for judgment when the PTC load is abnormal, and the MCU gives a fault prompt, which is safe and reliable.

[0053] Preferably, the silicon controlled circuit comprises silicon controlled rectifiers T1 and T2.

[0054] In summary, the utility model provides a constant temperature control three hole pair plug circuit, including heating body and controller.

[0055] The controller realizes accurate control of the temperature of the heating body through various circuit elements, and guarantees temperature stability and safety.

[0056] The utility model discloses a constant temperature control three hole pair plug circuit's three wire butt joint is relative to four core or five core pair plug connection mode, and the connection structure is simpler, and easy to design and manufacture, and has reduced manufacturing cost.

[0057] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A thermostatically controlled three-hole plug-in circuit, characterized in that: include: Heating element and controller; The heating element includes: an NTC sensing wire, an NTC layer and a PTC heating wire; The controller includes: a fuse, a voltage stabilizing circuit, a user interface, a power supply voltage monitoring circuit, a synchronization signal circuit, an NTC voltage detection circuit, an NTC load detection circuit, a PTC load detection circuit, a thyristor, a reference resistor, a voltage sampling circuit, and a microprocessor; The controller and the heating element are connected using a three-wire connection method.

2. The thermostatically controlled three-hole plug-in circuit according to claim 1, characterized in that: The NTC sensing wires are connected end to end, and any overheating point can feedback impedance information through the sensing wire.

3. The thermostatically controlled three-hole plug-in circuit according to claim 1, characterized in that: The controller and the heating element are connected in a three-wire connection mode, specifically: the AC power H1 is connected to HA, the NTC voltage detection and load detection H2 is connected to HB, and the thyristor terminal H3 is connected to HC.

4. The thermostatically controlled three-hole plug-in circuit according to claim 1, characterized in that: The voltage stabilizing circuit includes: a current limiting resistor R6, half-wave rectifier diodes D1 and D2, a voltage stabilizing IC U2, filter capacitors C2 and C3, and voltage dividing resistors R1 and R8; The current limiting resistor R6 and half-wave rectifier diodes D1 and D2 are connected in series and connected to the DR pin of the voltage regulator IC U2; One end of the voltage divider resistor R7 is connected to the SEL pin of the voltage regulator IC U2, and the other end is grounded; One end of the voltage divider resistor R8 is connected to the VOUT pin of the voltage regulator IC U2, and the other end is grounded; One end of the filter capacitor C2 is connected to the VDD pin of the voltage regulator IC U2, and the other end is grounded; One end of the filter capacitor C3 is connected to the VOUT pin of the voltage regulator IC U2, and the other end is grounded.

5. The thermostatically controlled three-hole plug-in circuit according to claim 1, characterized in that: The power supply voltage monitoring circuit includes: voltage dividing resistors R3, R4, and R5 connected in series, one end of which is connected to the AC power and the other end is grounded.

6. The thermostatically controlled three-hole plug-in circuit according to claim 1, characterized in that: The synchronization signal circuit includes: voltage dividing resistors R9 and R10 connected in series.

7. The thermostatically controlled three-hole plug-in circuit according to claim 1, characterized in that: The NTC voltage detection circuit includes: voltage dividing resistors R15 and R14, and a filter capacitor C6; The NTC voltage load detection circuit is mainly composed of voltage dividing resistors R18 and R19.

8. The thermostatically controlled three-hole plug-in circuit according to claim 1, characterized in that: The PTC load detection circuit includes voltage-dividing resistors R20 and R21.

9. The thermostatically controlled three-hole plug-in circuit according to claim 1, characterized in that: The PTC reference resistor R24 ​​and the voltage sampling R23 are composed.

10. The thermostatically controlled three-hole plug-in circuit according to claim 1, characterized in that: The thyristor circuit includes: a bidirectional thyristor T1 circuit consisting of a coupling capacitor C7, a current limiting resistor R22, and T1; The bidirectional thyristor T2 circuit consists of a current limiting resistor R13, a filter capacitor C5, a voltage divider resistor R12, T2, a load resistor R11, and a temperature fuse R2.

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