Half-wave sine protection driving circuit of double-core heating wire three-wire three-pin circuit of double-partition PTC heater

Abstract

The utility model provides a half-wave sine protection circuit of a three-wire three-pin circuit of a double-core heating wire of a double-partition PTC heater, and the half-wave sine protection circuit can also be a four-partition circuit X2. Comprising a controller and a blanket body, the blanket body comprises a first partition and a second partition, and 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, 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 cross detection module, a display module, a key module, a contact pin H1, a contact pin H2 and a contact pin H3. And a first half-wave sine protection driving circuit module and a second half-wave sine protection driving circuit module.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a half-wave sine protection drive circuit for a double-zone PTC heater with double-core heating wires, three wires and three pins. 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 need 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, complex wiring processes, and risks of impact damage to heating wires / power components caused by high power and instantaneous high current at high input operating voltages, such as 220-240V AC. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] In view of the shortcomings of the prior art, the utility model provides a dual-zone PTC heater dual-core heating wire 3-wire 3-pin half-wave sinusoidal protection drive 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, complex wiring processes, and risks of impact damage to the heating wires / power components caused by high power and instantaneous large current at high input operating voltages, such as 220-240V AC.

[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 double-zone PTC heater double-core heating wire 3-wire 3-pin half-wave sine protection drive circuit, including a controller and a blanket body, the blanket body includes 1 zone and 2 zones, 1 zone includes: heating wire and 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, a connector pin H3, a first half-wave sinusoidal protection drive circuit module, and a second half-wave sinusoidal protection drive circuit module;

[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 temperature sensing line end of the 1-B-zone;

[0015] The first half-wave sinusoidal protection driving circuit module includes: a resistor R22, a diode D1; one end of the resistor R22 is connected to the 1-zone 1-A-temperature sensing wire end and the "+" end of the diode D1 end, and the other end of the resistor R22 is connected to the 1-zone 1-A-PTC heating wire end and the "-" end of the diode D1 end;

[0016] The second half-wave sinusoidal protection drive circuit module includes: a resistor R23 and a diode D2; one end of the resistor R23 is connected to the "+" end of the 2-partition 2-A-temperature sensing wire connected to the diode D2, and the other end of the resistor R23 is connected to the "-" end of the 2-partition 2-A-PTC heating wire connected to the diode D2.

[0017] 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;

[0018] The EMI module is connected to the zero-crossing detection module and the 5V voltage stabilizing circuit;

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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;

[0023] The main control circuit outputs a heating drive signal to the first heating drive and / or the second heating drive.

[0024] Preferably, the first heating drive and the second heating drive are both thyristor drives;

[0025] The utility model also provides a heater, which is made based on a double-zone PTC heater with double-core heating wires, three wires and three pins, and a half-wave sinusoidal protection drive circuit as described above.

[0026] (III) Beneficial effects

[0027] The utility model provides a double-zone PTC heater double-core heating wire 3-wire 3-pin half-wave sine protection drive circuit. It has the following beneficial effects:

[0028] A double-zone PTC heater double-core heating wire 3-wire 3-pin half-wave sine protection drive circuit based on the utility model adopts the design of series heating of the temperature-sensing wire and the heating wire of zone 1 and zone 2 and unidirectional conduction half-sine wave heating. The plug pin H1 is connected to one end of the heating wire of zone 1 and zone 2, and the plug pin H2 and the plug pin H3 are independently connected to the zone drive control, so as to reduce the product cost and the more complicated connection and wiring process while independently controlling the temperature data of zone 1 and zone 2, simplifying the connection process, reducing the connection time, reducing labor costs, and improving production efficiency; when the circuit is connected and the power-on preparation is completed, in the positive half-wave, the current of zone 1 passes through the plug pin H1 to the 1-B-PTC heating wire end to the 1-A-PTC heating wire end through the D1 diode to the 1-A temperature-sensing wire end and then exits from the 1-B temperature-sensing wire end through the first heating drive to form a loop, and the current of zone 2 passes through the plug pin H1 to the 1-B-PTC heating wire end to the 1-A-PTC heating wire end To the 2-B-PTC heating wire end to the 2-A-PTC heating wire end, through the D2 diode to the 2-A temperature sensing wire end, and then out of the 2-B temperature sensing wire end through the first heating drive to form a loop; if in the negative half-wave, since D1 is a unidirectional conductive diode D1 is in the cut-off state at this time, the loop heating work cannot be formed at this time, and the instantaneous current impact when turned on is added. The R22 resistor is reduced The impact of the current on D1 achieves the purpose of protecting D1. In the negative half-wave, since D2 is a unidirectional conductive diode D2 is in the cut-off state at this time, the loop heating work cannot be formed at this time. The instantaneous current impact when turned on is added. The R23 resistor is reduced The impact of the current on D2 achieves the purpose of protecting D2, protects the circuit safety, and solves the risk of impact damage to the heating wire / power component caused by high power and instantaneous large current at high input working voltages such as 220-240VAC. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A functional block diagram of a double-zone PTC heater double-core heating wire 3-wire 3-pin half-wave sine protection drive circuit provided by an embodiment of the utility model;

[0030] Figure 2 A partial circuit diagram of a dual-zone and half-wave sine protection drive circuit of a dual-zone PTC heater dual-core heating wire 3-wire 3-pin half-wave sine protection drive circuit provided by an embodiment of the utility model;

[0031] Figure 3 A circuit diagram of a double-zone PTC heater double-core heating wire 3-wire 3-pin half-wave sine protection drive circuit provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0032] 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.

[0033] like Figure 1 As shown, the embodiment of the utility model provides a double-zone PTC heater double-core heating wire 3-wire 3-pin half-wave sine protection drive circuit, including a controller and a blanket body, the blanket body includes 1 zone and 2 zones, 1 zone includes: heating wire and 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;

[0034] 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;

[0035] The temperature sensing wires and heating wires of zone 1 and zone 2 are connected in series;

[0036] 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, a connector pin H3, a first half-wave sinusoidal protection drive circuit module, and a second half-wave sinusoidal protection drive circuit module;

[0037] 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;

[0038] 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;

[0039] 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;

[0040] 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 temperature sensing line end of the 1-B-zone;

[0041] The first half-wave sinusoidal protection driving circuit module includes: a resistor R22, a diode D1; one end of the resistor R22 is connected to the 1-zone 1-A-temperature sensing wire end and the "+" end of the diode D1 end, and the other end of the resistor R22 is connected to the 1-zone 1-A-PTC heating wire end and the "-" end of the diode D1 end;

[0042] The second half-wave sinusoidal protection module driving circuit includes: a resistor R23 and a diode D2; one end of the resistor R23 is connected to the "+" end of the 2-partition 2-A-temperature sensing wire connected to the diode D2 end, and the other end of the resistor R23 is connected to the "-" end of the 2-partition 2-A-PTC heating wire connected to the diode D2 end.

[0043] 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;

[0044] The EMI module is connected to the zero-crossing detection module and the 5V voltage stabilizing circuit;

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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;

[0049] The main control circuit outputs a heating drive signal to the first heating drive and / or the second heating drive.

[0050] Preferably, the first heating drive and the second heating drive are both thyristor drives.

[0051] The utility model also provides a heater, which is made based on a double-zone PTC heater with double-core heating wires, three wires and three pins, and a half-wave sinusoidal protection drive circuit as described above.

[0052] like Figure 3 The figure shows a half-wave sinusoidal protection drive circuit of a double-zone PTC heater with double-core heating wires, three wires and three pins provided by an embodiment of the utility model.

[0053] 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.

[0054] When the circuit is connected, the AC power goes through the fuse F1 and the connector H1 to one end of the heating wire in the A and B zones, and then to the U3 voltage regulator tube through R11, D6, and D5 to output DC5V to U1. Then R3 and R7 give the zero-crossing signal to the INT pin 15 of U1. At this time, the power-on preparation is complete.

[0055] When the external button inputs the corresponding partition command, the 9th or 13th pin of U1 outputs a pulse to drive the thyristor (first heating drive or second heating drive) of partition 1 or partition 2 to conduct, and the corresponding indicator light is on. If in the positive half-wave, the current of partition 1 is from "L" through the connector pin H1 to the 1-B-PTC heating line end to the 1-A-PTC heating line end through the D1 diode to the 1-A temperature sensing line end, and then from the 1-B temperature sensing line end to the T1, T2 thyristor to the "N" end to form a loop; the current of partition 2 is from "L" through the connector pin H1 to the 2-B-PTC heating line end to the 2-A-PTC heating line end through the D2 diode to the 2-A temperature sensing line end, and then from the 2-B temperature sensing line end to the T11, T21 thyristor to the "N" end to form a loop, and the positive half-wave work is completed at this time.

[0056] If in the negative half-wave, the current in the 1st partition is from "N" to T2, T1 through H2 to the 1-B temperature sensing line and into the 1-A temperature sensing line and out to D1, because D1 is a unidirectional conduction bipolar tube, D1 is in the cut-off state at this time, and the loop heating work cannot be formed at this time. Due to the instantaneous current impact when it is turned on, the R22 resistor is added to reduce the impact of the current on D1 to achieve the purpose of protecting D1. In the negative half-wave, the current in the 2nd partition is from "N" to T21, T11 through H3 to the 2-B temperature sensing line and into the 2-A temperature sensing line and out to D2. Since D2 is a unidirectional conduction bipolar tube, D2 is in the cut-off state at this time, and the loop heating work cannot be formed at this time. Due to the instantaneous current impact when it is turned on, the R23 resistor is added to reduce the impact of the current on D2 to achieve the purpose of protecting D2.

[0057] Then, according to the corresponding temperature value of the external button command, read the values ​​of pins 10 (2 partitions) and 12 (1 partition) for comparison to control the conduction of the thyristor in each partition, thereby controlling the temperature of the heating wire in each zone. When the timing data is input externally, U1 starts timing. Pins 10 and 12 of U1 read the PTC value signal of the partition 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 U1 can be flexibly adjusted according to the range supported by different chips and different models.

[0058] 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. Double-zone PTC heater double-core heating wire 3-wire 3-pin circuit half-wave sine protection drive circuit, including controller and blanket body, characterized by: The blanket body includes 1 partition and 2 partitions, and 1 partition includes: a heating wire and a 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, a connector pin H3, a first half-wave sinusoidal protection drive circuit module, and a second half-wave sinusoidal protection drive circuit module; 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 temperature sensing line end of the 1-B-zone; The first half-wave sinusoidal protection module includes: a resistor R22, a diode D1; one end of the resistor R22 is connected to the 1-zone 1-A-temperature sensing wire end and the "+" end of the diode D1 end, and the other end of the resistor R22 is connected to the 1-zone 1-A-PTC heating wire end and the "-" end of the diode D1 end; The second half-wave sinusoidal protection module includes: a resistor R23 and a diode D2; one end of the resistor R23 is connected to the "+" end of the 2-zone 2-A-temperature sensing wire connected to the diode D2 end, and the other end of the resistor R23 is connected to the "-" end of the 2-zone 2-A-PTC heating wire connected to the diode D2 end.

2. According to claim 1, the double-zone PTC heater double-core heating wire 3-wire 3-pin circuit half-wave sine protection drive circuit is characterized in that: 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. The half-wave sine protection driving circuit of the double-zone PTC heater double-core heating wire 3-wire 3-pin circuit according to claim 1 is characterized in that: 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. The half-wave sine protection driving circuit of the double-zone PTC heater double-core heating wire 3-wire 3-pin circuit according to claim 1 is characterized in that: 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. The half-wave sine protection driving circuit of the double-zone PTC heater double-core heating wire 3-wire 3-pin circuit according to claim 1 is characterized in that: 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; The main control circuit outputs a heating drive signal to the first heating drive and / or the second heating drive.

6. The half-wave sine protection driving circuit of the double-zone PTC heater double-core heating wire 3-wire 3-pin circuit according to claim 5 is characterized in that: The first heating drive and the second heating drive are both thyristor drives.

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