Three-wire three-needle circuit of double-core heating wire of double-partition PTC (Positive Temperature Coefficient) heater

Abstract

The utility model provides a double-partition PTC heater double-core heating wire three-wire three-pin circuit, which comprises a controller and a blanket body, the blanket body comprises a first partition and a second partition, the first partition comprises a heating wire, a temperature sensing wire, a 1-A-PTC heating wire end, a 1-A-temperature sensing wire end, a 1-B-PTC heating wire end and a 1-B-temperature sensing wire end; the second partition comprises a heating wire, a temperature sensing wire, a 2-A-PTC heating wire end, a 2-A-temperature sensing wire end, a 2-B-PTC heating wire end and a 2-B-temperature sensing wire end; the temperature sensing wires of the first zone and the second zone are connected in series with the heating wires; the controller comprises an AC power supply input module, a fuse F1, a main control circuit, a first heating drive, a second heating drive, and pins H1, H2 and H3. One end of the contact pin H1 is connected with the AC power supply input module through the fuse F1, and the other end of the contact pin H1 is connected with the 1-B-PTC heating wire end and the 2-A-PTC heating wire end; one end of the contact pin H2 is connected with the first heating drive, and the other end of the contact pin H2 is connected with the 2-A-temperature sensing line end; and one end of the contact pin H3 is connected with the second heating driver, and the other end of the contact pin H3 is connected with the 1-B-temperature sensing wire end.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a double-zone PTC heater double-core heating wire 3-wire 3-pin circuit. Background Art

[0002] Dual-zone PTC (Positive Temperature Coefficient) is a PTC heater with two heating zones. PTC is a special type of thermistor whose resistance value increases with increasing temperature. Dual-zone PTC heaters are usually designed to have two independent heating zones, each of which can be individually temperature controlled to achieve heating requirements for different zones.

[0003] The dual-zone PTC heater is a powerful, safe and reliable heating device. It provides users with a personalized and comfortable heating experience by independently controlling the temperature of different zones. It is suitable for various heating needs, such as electric blankets, heaters, etc. Traditional dual-zone PTC heaters require a 4-wire 4-pin circuit or a 5-wire 5-pin circuit to be electrically connected to the controller, resulting in excessively high product costs and complex circuit connections and wiring processes. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the utility model provides a dual-zone PTC heater with a dual-core heating wire and a 3-wire 3-pin circuit, which solves the problem that the traditional dual-zone PTC heater proposed in the above background technology needs to use a 4-wire 4-pin circuit or a 5-wire 5-pin circuit to be electrically connected to the controller, resulting in excessively high product costs and complex circuit connections and wiring processes.

[0006] (II) Technical solution

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] The utility model embodiment provides a dual-zone PTC heater dual-core heating wire 3-wire 3-pin circuit, including a controller and a blanket body, the blanket body includes 1 zone and 2 zones, 1 zone includes: a heating wire and a temperature sensing wire, 1 zone 1-A-PTC heating wire end, 1 zone 1-A-temperature sensing wire end, 1 zone 1-B-PTC heating wire end, 1 zone 1-B-temperature sensing wire end;

[0009] 2 zones include: heating wire and temperature sensing wire, 2 zones 2-A-PTC heating wire end, 2 zones 2-A-temperature sensing wire end, 2 zones 2-B-PTC heating wire end, 2 zones 2-B-temperature sensing wire end;

[0010] The temperature sensing wires and heating wires of zone 1 and zone 2 are connected in series;

[0011] The controller includes: an AC power input module, a fuse F1, an EMI module, a 5V voltage stabilizing circuit, a main control circuit, a first PTC sampling temperature control module, a first heating drive, a second PTC sampling temperature control module, a second heating drive, a heating wire NTC temperature sensing wire short circuit and open circuit detection and protection module, a zero-crossing detection module, a display module, a button module, a connector pin H1, a connector pin H2, and a connector pin H3;

[0012] One end of the connector pin H1 is connected to the AC power input module through the fuse F1, and the other end of the connector pin H1 is connected to the 1-B-PTC heating wire end of the 1st zone and the 2-A-PTC heating wire end of the 2nd zone;

[0013] One end of the connector pin H2 is connected to the first heating driver, and the other end of the connector pin H2 is connected to the 2-A-temperature sensing line end of the 2nd partition;

[0014] One end of the connector pin H3 is connected to the second heating driver, and the other end of the connector pin H3 is connected to the 1-B-temperature sensing line end of the 1 partition.

[0015] Preferably, one end of the AC power input module is grounded, and the other end is connected to the EMI module via a fuse F1;

[0016] The EMI module is connected to the zero-crossing detection module and the 5V voltage stabilizing circuit;

[0017] The zero-crossing detection module includes a resistor R4 and a resistor R5, which are connected in series to generate a zero-crossing signal which is input to the main control circuit.

[0018] Preferably, the display module is connected to the main control circuit to execute display indication drive output, and the key module is connected to the main control circuit to execute key signal input.

[0019] Preferably, the heating wire NTC temperature sensing wire short circuit and open circuit detection and protection module includes: an NTC1 thermistor and a resistor R18, which are connected in series, one end of the NTC1 thermistor is connected to a +5V VCC power supply, and the resistor R18 is grounded.

[0020] Preferably, the first PTC sampling temperature control module, the first heating drive, the second PTC sampling temperature control module, and the second heating drive are respectively connected to the main control circuit;

[0021] The main control circuit outputs a heating drive signal to the first heating drive and / or the second heating drive.

[0022] Preferably, the first heating drive and the second heating drive are both thyristor drives;

[0023] Preferably, two sets of this circuit can perform 4-zone PTC heater control.

[0024] The embodiment of the utility model also provides a heater, which is made based on a double-zone PTC heater double-core heating wire 3-wire 3-pin circuit as described above.

[0025] (III) Beneficial effects

[0026] The utility model provides a double-zone PTC heater double-core heating wire 3-wire 3-pin circuit. It has the following beneficial effects:

[0027] Based on the double-zone PTC heater double-core heating wire 3-wire 3-pin circuit of the utility model, the temperature sensing wire and heating wire of zone 1 and zone 2 are connected in series for heating, and the plug pin H1 is connected to one end of the heating wire of zone 1 and zone 2. The plug pin H2 and the plug pin H3 are independently connected to the zone drive control. Thus, the temperature data of zone 1 and zone 2 can be independently controlled while reducing the product cost and the more complicated connection and wiring process, simplifying the connection process, reducing the connection time, reducing the labor cost, and improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A functional block diagram of a dual-zone PTC heater dual-core heating wire 3-wire 3-pin circuit provided by an embodiment of the utility model;

[0029] Figure 2 A double-zone partial circuit diagram of a double-zone PTC heater double-core heating wire 3-wire 3-pin circuit provided by an embodiment of the utility model;

[0030] Figure 3 A circuit diagram of a double-zone PTC heater double-core heating wire 3-wire 3-pin circuit provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0032] like Figure 1 As shown, the embodiment of the utility model provides a dual-zone PTC heater dual-core heating wire 3-wire 3-pin circuit, including a controller and a blanket body, the blanket body includes 1 zone and 2 zones, 1 zone includes: a heating wire and a temperature sensing wire, 1 zone 1-A-PTC heating wire end, 1 zone 1-A-temperature sensing wire end, 1 zone 1-B-PTC heating wire end, 1 zone 1-B-temperature sensing wire end;

[0033] 2 zones include: heating wire and temperature sensing wire, 2 zones 2-A-PTC heating wire end, 2 zones 2-A-temperature sensing wire end, 2 zones 2-B-PTC heating wire end, 2 zones 2-B-temperature sensing wire end;

[0034] The temperature sensing wires and heating wires of zone 1 and zone 2 are connected in series;

[0035] The controller includes: an AC power input module, a fuse F1, an EMI module, a 5V voltage stabilizing circuit, a main control circuit, a first PTC sampling temperature control module, a first heating drive, a second PTC sampling temperature control module, a second heating drive, a heating wire NTC temperature sensing wire short circuit and open circuit detection and protection module, a zero-crossing detection module, a display module, a button module, a connector pin H1, a connector pin H2, and a connector pin H3;

[0036] like Figure 2 As shown, one end of the connector pin H1 is connected to the AC power input module through the fuse F1, and the other end of the connector pin H1 is connected to the 1-B-PTC heating wire end of the 1st partition and the 2-A-PTC heating wire end of the 2nd partition;

[0037] One end of the connector pin H2 is connected to the first heating driver, and the other end of the connector pin H2 is connected to the 2-A-temperature sensing line end of the 2nd partition;

[0038] One end of the connector pin H3 is connected to the second heating driver, and the other end of the connector pin H3 is connected to the 1-B-temperature sensing line end of the 1 partition.

[0039] Preferably, one end of the AC power input module is grounded, and the other end is connected to the EMI module via a fuse F1;

[0040] The EMI module is connected to the zero-crossing detection module and the 5V voltage stabilizing circuit;

[0041] The zero-crossing detection module includes a resistor R4 and a resistor R5, which are connected in series to generate a zero-crossing signal which is input to the main control circuit.

[0042] Preferably, the display module is connected to the main control circuit to execute display indication drive output, and the key module is connected to the main control circuit to execute key signal input.

[0043] Preferably, the heating wire NTC temperature sensing wire short circuit and open circuit detection and protection module includes: an NTC1 thermistor and a resistor R18, which are connected in series, one end of the NTC1 thermistor is connected to a +5V VCC power supply, and the resistor R18 is grounded.

[0044] Preferably, the first PTC sampling temperature control module, the first heating drive, the second PTC sampling temperature control module, and the second heating drive are respectively connected to the main control circuit;

[0045] The main control circuit outputs a heating drive signal to the first heating drive and / or the second heating drive.

[0046] Preferably, the first heating drive and the second heating drive are both thyristor drives.

[0047] Preferably, two sets of this circuit can perform 4-zone PTC heater control.

[0048] The embodiment of the utility model also provides a heater, which is made based on a double-zone PTC heater double-core heating wire 3-wire 3-pin circuit as described above.

[0049] like Figure 3 Shown is a circuit diagram of a double-zone PTC heater double-core heating wire 3-wire 3-pin circuit provided by an embodiment of the utility model.

[0050] Working principle: Pin 1 of the main control circuit chip U1 is the VCC power supply pin; Pin 2 is the temperature monitoring pin of the control system; Pin 3 is the abnormal monitoring of 1-zone thyristor and heating line; Pin 4 is ICSPCLK communication; Pin 5 is the ICSPDAT communication pin and external key command input pin; Pin 6 is the LED indication drive pin; Pin 7 is the LED indication drive pin; Pin 8 is the LED indication drive pin; Pin 9 is the thyristor drive pin of 1-zone heating line (first heating drive); Pin 10 is the sampling of 2-zone PTC heating line; Pin 11 is the abnormal monitoring of 2-zone thyristor and heating line. Pin 12 is the sampling of 1-zone PTC heating line; Pin 13 is the thyristor drive pin of 2-zone heating line (second heating drive); Pin 14 is NC; Pin 15 is the AC input voltage zero-crossing detection pin; Pin 16 is the GND pin of the main control circuit U1 chip; The main control circuit chip U1 is equipped with a multi-functional and reusable IO port, which can be used for corresponding functions. The parameters can be adjusted arbitrarily according to different control chip control systems.

[0051] When the circuit is connected, the mains electricity goes through the fuse F1 and the connector pin H1 to one end of the heating wires in zones A and B, and then to the U3 voltage regulator tube through R11, D6, and D5 to output DC5V to the main control circuit U1. Then R3 and R7 give the zero-crossing signal to the INT at pin 15 of U1. At this time, the power-on preparation is complete. When the external button inputs the corresponding partition instruction, the output pulse of the 9th or 13th pin of the main control circuit U1 drives the thyristor of zone 1 or zone 2 to conduct, and the corresponding indicator lights up. The current of zone 1 goes from "L" through the connector pin H1 to the 1-B-PTC heating wire end to the 1-A-PTC heating wire end, and then enters the 1-A temperature sensing wire end, and then exits from the 1-B temperature sensing wire end through the T1 and T2 thyristors to the "N" end to form a loop.

[0052] The 2-zone current flows from "L" through the connector H1 to the 2-B-PTC heating wire end to the 2-A-PTC heating wire end, then enters the 2-A temperature sensing wire end, and then exits from the 2-B temperature sensing wire end through the T11, T21 thyristors to the "N" end to form a loop.

[0053] Then, according to the corresponding temperature value of the external button command, the values ​​of pin 10 (2 zones) and pin 12 (1 zone) are read for comparison to control the conduction of the thyristor in each zone, thereby controlling the temperature of the heating wire in each zone. When the timing data is input externally, U1 starts timing, and the 10th and 12th pins of the main control circuit U1 read the PTC value signal of the heating wire at the same time. If it exceeds the preset value, it is judged as abnormal use and an error warning is issued. At the same time, the output is turned off to cut off the dual-zone thyristor drive. Otherwise, it continues to run until the next cycle or the timing time ends. When the timing ends, U1 will output a 1hz signal to indicate that this cycle has been completed. During this period, if the temperature of the heating wire thyristor control system is abnormal, U1 will issue an error warning. At this point, all cycle work is completed. The pin position of the main control circuit U1 can be flexibly adjusted according to the range supported by different chips and different models.

[0054] Based on the double-zone PTC heater double-core heating wire 3-wire 3-pin circuit of the utility model, the temperature sensing wire and heating wire of zone 1 and zone 2 are connected in series for heating, and the plug pin H1 is connected to one end of the heating wire of zone 1 and zone 2. The plug pin H2 and the plug pin H3 are independently connected to the zone drive control. Thus, the temperature data of zone 1 and zone 2 can be independently controlled while reducing the product cost and the more complicated connection and wiring process, simplifying the connection process, reducing the connection time, reducing the labor cost, and improving the production efficiency.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-zone PTC heater double-core heating wire 3-wire 3-pin circuit, including a controller and a blanket body, Features: The blanket body includes: 1 partition and 2 partitions, 1 partition includes: heating wire and temperature sensing wire, 1 partition 1-A-PTC heating wire end, 1 partition 1-A-temperature sensing wire end, 1 partition 1-B-PTC heating wire end, 1 partition 1-B-temperature sensing wire end; 2 zones include: heating wire and temperature sensing wire, 2 zones 2-A-PTC heating wire end, 2 zones 2-A-temperature sensing wire end, 2 zones 2-B-PTC heating wire end, 2 zones 2-B-temperature sensing wire end; The temperature sensing wires and heating wires of zone 1 and zone 2 are connected in series; The controller includes: an AC power input module, a fuse F1, an EMI module, a 5V voltage stabilizing circuit, a main control circuit, a first PTC sampling temperature control module, a first heating drive, a second PTC sampling temperature control module, a second heating drive, a heating wire NTC temperature sensing wire short circuit and open circuit detection and protection module, a zero-crossing detection module, a display module, a button module, a connector pin H1, a connector pin H2, and a connector pin H3; One end of the connector pin H1 is connected to the AC power input module through the fuse F1, and the other end of the connector pin H1 is connected to the 1-B-PTC heating wire end of the 1st zone and the 2-A-PTC heating wire end of the 2nd zone; One end of the connector pin H2 is connected to the first heating driver, and the other end of the connector pin H2 is connected to the 2-A-temperature sensing line end of the 2nd partition; One end of the connector pin H3 is connected to the second heating driver, and the other end of the connector pin H3 is connected to the 1-B-temperature sensing line end of the 1 partition.

2. According to claim 1, a dual-zone PTC heater double-core heating wire 3-wire 3-pin circuit, Features: One end of the AC power input module is grounded, and the other end is connected to the EMI module through a fuse F1; The EMI module is connected to the zero-crossing detection module and the 5V voltage stabilizing circuit; The zero-crossing detection module includes a resistor R4 and a resistor R5, which are connected in series to generate a zero-crossing signal which is input to the main control circuit.

3. According to claim 1, a dual-zone PTC heater double-core heating wire 3-wire 3-pin circuit, Features: The display module is connected to the main control circuit to execute display indication drive output, and the key module is connected to the main control circuit to execute key signal input.

4. According to claim 1, a dual-zone PTC heater double-core heating wire 3-wire 3-pin circuit, Features: The heating wire NTC temperature sensing wire short circuit and open circuit detection and protection module comprises: an NTC1 thermistor and a resistor R18, which are connected in series, one end of the NTC1 thermistor is connected to a +5V VCC power supply, and the resistor R18 is grounded.

5. A double-zone PTC heater double-core heating wire 3-wire 3-pin circuit according to claim 1, Features: The first PTC sampling temperature control module, the first heating driver, the second PTC sampling temperature control module, and the second heating driver are respectively connected to the main control circuit; The main control circuit outputs a heating drive signal to the first heating drive and / or the second heating drive.

6. A double-zone PTC heater double-core heating wire 3-wire 3-pin circuit according to claim 5, Features: The first heating drive and the second heating drive are both thyristor drives.

7. A double-zone PTC heater double-core heating wire 3-wire 3-pin circuit according to claim 1, Features: Two sets of this circuit can perform 4-zone PTC heater control.

8. A heater, made based on a double-zone PTC heater double-core heating wire 3-wire 3-pin circuit as described in any one of claims 1-6.

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