Full-wave heating temperature measurement circuit
By designing a full-wave heating and temperature measurement circuit, and utilizing the combination of a double-layer wire heating module and a main control module, the problems of high cost of heating and temperature measurement, large power grid interference, and low temperature control consistency and accuracy in heating products are solved, achieving the effects of full-wave heating, cost reduction, and reduced power grid interference.
Patent Information
- Application Number
- CN202520142515.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-01-20
AI Technical Summary
Existing heating products suffer from high costs, significant grid interference, and low temperature control consistency and accuracy during both heating and temperature measurement. In particular, the limitation of chips, which results in heating only during the positive half-cycle and no heating during the negative half-cycle, increases production costs and grid power loss.
A full-wave heating temperature measurement circuit was designed, comprising a reference voltage input module, a double-layer wire heating temperature measurement module, and a main control module. By setting bidirectional thyristors and filter capacitors, full-wave heating is achieved, and temperature measurement is performed during the positive half-cycle under the control of the main control module, reducing the influence of mains voltage and improving temperature measurement accuracy.
It achieves full-wave heating, reduces production costs, minimizes grid interference and power loss in power lines, while improving temperature control consistency and measurement accuracy, and simplifies circuit structure.
Smart Images
Figure CN223827161U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model discloses heating technical field, especially relate to a full wave heating temperature measurement circuit and full wave heating half wave temperature measurement method. BACKGROUND
[0002] Heating appliances, such as electric blankets, are preferred heating appliances for warming beds in cold weather, not only allowing people to have a warm and comfortable feeling when sleeping, and easily falling asleep, in addition, the electric blanket is significantly energy-saving than other heating methods, and is economical and practical, so it is loved by people, such as the automatic temperature regulating electric blanket disclosed in Chinese patent publication No. CN205597633U. However, the early electric blanket technology is simple, and fire accidents caused by local high temperature are more, which also brings safety hazards and threats to people.
[0003] At present, heating appliances and other heating products with PTC / NTC characteristics need to heat and measure temperature. Due to the limitation of the chip, the current heating and temperature measurement method of the electric blanket is to use the positive half cycle to heat in each full wave, and not to heat in the negative half cycle only to measure the temperature, which is because the sampling voltage of the positive half cycle is positive, and the sampling voltage of the negative half cycle is negative. If the positive half cycle and the negative half cycle need to heat, two chips need to be used, thereby increasing the production cost. However, the current heating and temperature measurement method has relatively large interference to the power grid, increases the power loss of the power supply line, and the temperature control consistency and precision of the heating appliance are relatively low.
[0004] Therefore, in view of the deficiencies of the prior art, a full wave heating temperature measurement circuit is provided to solve the deficiencies of the prior art. CONTENT OF THE UTILITY MODEL
[0005] The utility model discloses a full wave heating temperature measurement circuit which can realize full wave heating, increase the power factor of the product, reduce the interference to the power grid, reduce the power loss of the power supply line, and also reduce the cost and simplify the circuit.
[0006] The above-mentioned purpose of the utility model is realized through the following technical measures:
[0007] A full wave heating temperature measurement circuit is provided, which is provided with a reference voltage input module for excluding the influence of commercial voltage and improving temperature measurement precision, a double-layer wire heating temperature measurement module for full wave heating, and a main control module. The AD_VOL end of the reference voltage input module is connected with the main control module, the main control module is connected with the LOAD_C end of the double-layer wire heating temperature measurement module, and the main control module is connected with the AD_PTC end of the double-layer wire heating temperature measurement module.
[0008] Preferably, the above-mentioned reference voltage input module is provided with resistors R38, R39, R40, R41 and capacitor C23. One end of resistor R40, one end of resistor R41 and one end of capacitor C23 are connected to ground in parallel. The other ends of resistor R40, the other ends of resistor R41 and the other ends of capacitor C23 are connected in parallel as AD_VOL terminal. The other end of resistor R40 is also connected in series with resistors R39 and R38 to the external power input terminal.
[0009] Preferably, the above-mentioned double-wire heating and temperature measurement module includes an outer wire, an inner wire, a bidirectional thyristor Q4, resistors R12, R15, R37, R47, and capacitor C22. The T1 terminal of the bidirectional thyristor Q4 is connected in series with the outer wire and the inner wire and connected to the external power input terminal. The T2 terminal of the bidirectional thyristor Q4 is connected to ground in series with resistor R47. The G terminal of the bidirectional thyristor Q4 is connected to the LOAD_C terminal in series with resistor R12 and connected to the main control module. The G terminal of the bidirectional thyristor Q4 is connected to the main control module in series with resistor R37 and connected to the AD_PTC terminal, and the AD_PTC terminal is connected to ground in series with capacitor C22. The two ends of resistor R15 are connected to the G terminal and the T2 terminal of the bidirectional thyristor Q4, respectively.
[0010] The full-wave heating temperature measurement circuit of this utility model is also equipped with a zero potential detection module, and the INPUTSIGNAL terminal of the zero potential detection module is connected to the main control module.
[0011] Preferably, the zero potential detection module is provided with a Zener diode D1, a resistor R2, a resistor R3, and a capacitor C1. The negative terminal of the Zener diode D1 is connected to the external power input terminal via resistors R3 and R2 in series. The negative terminal of the Zener diode D1 is connected to the main control module as the INPUTSIGNAL terminal. The positive terminal of the Zener diode D1 is grounded. One end of the capacitor C1 is connected to the negative terminal of the Zener diode D1, and the other end of the capacitor C1 is connected to the positive terminal of the Zener diode D1.
[0012] The full-wave heating temperature measurement circuit of this utility model is further provided with an internal ambient temperature detection module, a button module and a display module, wherein the internal ambient temperature detection module, the button module and the display module are respectively connected to the main control module.
[0013] Preferably, the above-mentioned internal ambient temperature detection module is equipped with a resistor R23, a capacitor C11 and a thermistor RT1. One end of the capacitor C11 is connected to the main control module, the other end of the capacitor C11 and one end of the thermistor RT1 are connected to ground in parallel, and the other end of the thermistor RT1 is connected to the VCC power supply terminal in series with the resistor R23.
[0014] Preferably, the above-mentioned button module is provided with switches SW1, SW2 and SW3. Pins 1 and 2 of switch SW1 are connected to the main control module, pins 1 and 2 of switch SW2 are connected to the main control module, pin 1 of switch SW2 is connected to the main control module, pins 3 and 4 of switch SW1 are grounded, pins 3 and 4 of switch SW2 are grounded, and pins 3 and 4 of switch SW3 are grounded.
[0015] Preferably, the display module is provided with LEDs LED3, LED4, LED5, LED6, LED7, LED8, LED9, LED10, LED11, LED12, LED13, and LED14. The negative terminals of LEDs LED3, LED4, LED5, LED6, LED7, and LED13 are connected in parallel and connected to the main control module. The positive terminals of LEDs LED3 and LED4 are connected in parallel. The positive terminals of LEDs 5, 6, 7, and 8 are connected to the main control module. The negative terminals of LEDs 11, 10, 9, 8, 12, and 14 are connected in parallel and to the main control module. The positive terminals of LEDs 11, 10, 9, 8, 12, and 14 are also connected to the main control module.
[0016] Preferably, the main control module includes a chip U3 and a capacitor C12. Pin 1 of chip U3 is connected in series with capacitor C12 to the VCC power supply terminal. Pin 1 of chip U3 is grounded. Pin 20 of chip U3 is connected to the 5V power supply terminal. Pin 2 of chip U3 is connected to the negative terminals of LED13 and LED14. Pin 3 of chip U3 is connected to the negative terminals of LED3 and LED11. Pin 4 of chip U3 is connected to the negative terminals of LED4 and LED10. Pin 5 of chip U3 is connected to the negative terminals of LED5 and LED9. Pin 6 of chip U3 is connected to the negative terminals of LED6 and LED8. Pin 7 of chip U3 is connected to the negative terminals of LED7 and LED12. Pin 9 of chip U3 is connected to the negative terminals of LED3 and LED11. Connect the negative terminals of D4, LED5, LED6, LED7, and LED13. Connect pin 9 of chip U3 to the AD_VOL terminal. Connect pin 10 of chip U3 to pins 1 and 2 of switch SW2. Connect pin 18 of chip U3 to the negative terminals of LED11, LED10, LED9, LED8, LED12, and LED14. Connect pin 17 of chip U3 to pins 1 and 2 of switch SW1. Connect pin 16 of chip U3 to one end of capacitor C11. Connect pin 15 of chip U3 to the AD_PTC terminal. Connect pin 13 of chip U3 to pin 1 of switch SW3. Connect pin 12 of chip U3 to the LOAD_C terminal. Connect pin 11 of chip U3 to the INPUTSIGNAL terminal.
[0017] The full-wave heating temperature measurement circuit of this utility model also includes a step-down module for powering the main control module. The step-down module includes a chip U4, resistors R30 and R31, a diode D53, a thermistor R24, capacitors C2, C6, and C9, coupling capacitors C7, C8, and C13, and a fuse F1. Pin 1 of chip U4 is connected to ground via series resistor R31, pin 2 of chip U4 is grounded, pin 3 of chip U4 is connected to ground via series capacitor C6, pin 3 of chip U4 is also connected to the VCC power supply terminal, pin 3 of chip U4 is connected to the positive terminal of coupling capacitor C7, and pin 4 of chip U4 is connected to the positive terminal of coupling capacitor C13. The connections are as follows: pin 4 of chip U4 is connected to the positive terminal of coupling capacitor C8; pin 4 of chip U4 is connected in series with capacitor C9 and grounded; pin 4 of chip U4 serves as the VCC power supply terminal; the negative terminals of coupling capacitors C7, C8, and C13 are grounded; pins 5, 6, 7, and 8 of chip U4 are connected in parallel; pin 5 of chip U4 is connected in series with resistor R30 and the positive terminal of diode D53; the positive terminal of diode D53 is connected to the external power input terminal; the positive terminal of diode D53 is connected in series with thermistor R24 and grounded; the positive terminal of diode D53 is connected in series with capacitor C2 and grounded; and the positive terminal of diode D53 is connected in series with fuse F1 and connected to the external power input terminal.
[0018] Preferably, the outer filament and the inner filament are separated from each other by a molten layer.
[0019] This invention discloses a full-wave heating temperature measurement circuit, comprising a reference voltage input module for improving temperature measurement accuracy by eliminating the influence of mains voltage, a double-layer wire heating temperature measurement module for full-wave heating, and a main control module. The AD_VOL terminal of the reference voltage input module is connected to the main control module, the main control module is connected to the LOAD_C terminal of the double-layer wire heating temperature measurement module, and the AD_PTC terminal of the double-layer wire heating temperature measurement module. This invention's full-wave heating temperature measurement circuit enables full-wave heating, increases the product's power factor, reduces grid interference, reduces power loss in power supply lines, and also lowers costs and simplifies the circuit. Attached Figure Description
[0020] The present invention will be further described with reference to the accompanying drawings, but the contents of the drawings do not constitute any limitation on the present invention.
[0021] Figure 1 This is the circuit diagram for the reference voltage input module.
[0022] Figure 2 This is the circuit diagram for a double-wire heating and temperature measurement module.
[0023] Figure 3 This is the circuit diagram for the zero potential detection module.
[0024] Figure 4 This is the circuit diagram for the button module.
[0025] Figure 5 This is the circuit diagram for the internal ambient temperature detection module.
[0026] Figure 6 This is the circuit diagram for the display module.
[0027] Figure 7 This is the circuit diagram of the main control module.
[0028] Figure 8 This is the circuit diagram of the step-down module. Detailed Implementation
[0029] The technical solution of this utility model will be further explained with reference to the following embodiments.
[0030] Example 1
[0031] A full-wave heating temperature measurement circuit, such as Figure 1 As shown, the device includes a reference voltage input module to eliminate the influence of mains voltage and improve temperature measurement accuracy, a double-wire heating temperature measurement module for full-wave heating, and a main control module. The AD_VOL terminal of the reference voltage input module is connected to the main control module, the IO port of the main control module is connected to the LOAD_C terminal of the double-wire heating temperature measurement module, and the main control module is connected to the AD_PTC terminal of the double-wire heating temperature measurement module.
[0032] like Figure 1 The reference voltage input module is equipped with resistors R38, R39, R40, R41 and capacitor C23. One end of resistor R40, one end of resistor R41 and one end of capacitor C23 are connected to ground in parallel. The other ends of resistor R40, the other ends of resistor R41 and the other ends of capacitor C23 are connected in parallel as the AD_VOL terminal. The other end of resistor R40 is also connected in series with resistors R39 and R38 to the external power input terminal.
[0033] It should be noted that the principle of the reference voltage input module of this utility model for filtering mains voltage is as follows:
[0034] First, assume the mains voltage is Vh, the heating resistance is RI, and the ADC sampling bit depth is 10 bits.
[0035] The parallel resistance of R41 and R40 is defined as Rb, which is calculated by the following formula: Rb = R41 * R40 / (R41 + R40).
[0036] The reference voltage is set as Vref, which is calculated using the following formula:
[0037] Vref=Vh*Rb / (Rb+R40+R41).
[0038] The voltage value of AD_PTC, Vad ptc, is equal to Vh / (RI+R47)*R47.
[0039] Finally, the 10-bit ADC value of AD_PTC is: Vad ptc / Vref*210-Vad ptc / Vref*1024. After replacing the formula, Vh can be removed, thus filtering out the influence of mains voltage.
[0040] This invention improves the detection accuracy of the 10-bit ADC value of AD_PTC by using a reference voltage input module, thereby improving the overall temperature measurement accuracy even without the need for temperature measurement during each negative half-cycle as in the prior art.
[0041] like Figure 2 The double-wire heating and temperature measurement module consists of an outer wire, an inner wire, a bidirectional thyristor Q4, resistors R12, R15, R37, R47, and capacitor C22. The T1 terminal of the bidirectional thyristor Q4 is connected in series with the outer and inner wires and then to the external power input. The T2 terminal of the bidirectional thyristor Q4 is grounded in series with resistor R47. The G terminal of the bidirectional thyristor Q4 is connected to the LOAD_C terminal via resistor R12 and to the main control module. The G terminal of the bidirectional thyristor Q4 is connected to the main control module in series with resistor R37 and to the AD_PTC terminal, which is also grounded via capacitor C22. The two ends of resistor R15 are connected to the G and T2 terminals of the bidirectional thyristor Q4, respectively. The outer and inner wires are separated by a molten layer.
[0042] The bidirectional thyristor Q4 in this invention enables bidirectional current conduction, allowing the full-wave heating temperature measurement circuit to achieve full-wave heating using only a single chip. Resistor R47 samples the current, generating a voltage that is then supplied to the main control module. Resistor R12 acts as a current-limiting resistor for the bidirectional thyristor Q4. Resistor R15 acts as a pull-down resistor for the bidirectional thyristor Q4, ensuring stable turn-off. Resistor R37 protects against surges, reducing the probability of damage to the main control module's input port. Capacitor C22 serves as a filter capacitor.
[0043] The full-wave heating temperature measurement circuit of this utility model is also equipped with a zero potential detection module, and the INPUTSIGNAL terminal of the zero potential detection module is connected to the main control module.
[0044] like Figure 3The zero potential detection module is equipped with a Zener diode D1, resistors R2 and R3, and capacitor C1. The cathode of Zener diode D1 is connected to the external power input terminal via resistors R3 and R2 in series. The cathode of Zener diode D1 is connected to the main control module as the INPUTSIGNAL terminal. The anode of Zener diode D1 is grounded. One end of capacitor C1 is connected to the cathode of Zener diode D1, and the other end of capacitor C1 is connected to the anode of Zener diode D1.
[0045] The full-wave heating temperature measurement circuit of this utility model is also equipped with an internal ambient temperature detection module, a button module and a display module, which are respectively connected to the main control module.
[0046] like Figure 4 The button module is equipped with switches SW1, SW2 and SW3. Pins 1 and 2 of switch SW1 are connected to the main control module, pins 1 and 2 of switch SW2 are connected to the main control module, pin 1 of switch SW2 is connected to the main control module, pins 3 and 4 of switch SW1 are grounded, pins 3 and 4 of switch SW2 are grounded, and pins 3 and 4 of switch SW3 are grounded.
[0047] It should be noted that the button module is used to switch the entire circuit on and off, and also to set the time and temperature.
[0048] like Figure 5 The internal ambient temperature detection module is equipped with a resistor R23, a capacitor C11 and a thermistor RT1. One end of the capacitor C11 is connected to the main control module, and the other end of the capacitor C11 and one end of the thermistor RT1 are connected to ground in parallel. The other end of the thermistor RT1 is connected to the VCC power supply terminal in series with the resistor R23.
[0049] like Figure 6The display module is equipped with LEDs LED3, LED4, LED5, LED6, LED7, LED8, LED9, LED10, LED11, LED12, LED13, and LED14. The negative terminals of LEDs LED3, LED4, LED5, LED6, LED7, and LED13 are connected in parallel and connected to the main control module. The positive terminals of LEDs LED3 and LED4 are connected in parallel. The positive terminals of LEDs 5, 6, 7, and 8 are connected to the main control module. The negative terminals of LEDs 11, 10, 9, 8, 12, and 14 are connected in parallel and to the main control module. The positive terminals of LEDs 11, 10, 9, 8, 12, and 14 are connected to the main control module.
[0050] It should be noted that the display module is used to display information such as real-time temperature, set temperature, time, and on / off status.
[0051] like Figure 7The main control module of this utility model includes a chip U3 and a capacitor C12. Pin 1 of chip U3 is connected in series with capacitor C12 to the VCC power supply terminal. Pin 1 of chip U3 is grounded. Pin 20 of chip U3 is connected to the 5V power supply terminal. Pin 2 of chip U3 is connected to the negative terminals of LED13 and LED14. Pin 3 of chip U3 is connected to the negative terminals of LED3 and LED11. Pin 4 of chip U3 is connected to the negative terminals of LED4 and LED10. Pin 5 of chip U3 is connected to the negative terminals of LED5 and LED9. Pin 6 of chip U3 is connected to the negative terminals of LED6 and LED8. Pin 7 of chip U3 is connected to the negative terminals of LED7 and LED12. Pin 9 of chip U3 is connected to the negative terminals of LED3 and LED12. Connect the negative terminals of ED4, LED5, LED6, LED7, and LED13. Connect pin 9 of chip U3 to the AD_VOL terminal. Connect pin 10 of chip U3 to pins 1 and 2 of switch SW2. Connect pin 18 of chip U3 to the negative terminals of LED11, LED10, LED9, LED8, LED12, and LED14. Connect pin 17 of chip U3 to pins 1 and 2 of switch SW1. Connect pin 16 of chip U3 to one end of capacitor C11. Connect pin 15 of chip U3 to the AD_PTC terminal. Connect pin 13 of chip U3 to pin 1 of switch SW3. Connect pin 12 of chip U3 to the LOAD_C terminal. Connect pin 11 of chip U3 to the INPUTSIGNAL terminal.
[0052] The full-wave heating temperature measurement circuit of this utility model also includes a step-down module for powering the main control module. For example... Figure 8The step-down module includes chip U4, resistors R30 and R31, diode D53, thermistor R24, capacitors C2, C6, and C9, coupling capacitors C7, C8, and C13, and fuse F1. Pin 1 of chip U4 is connected to ground via series with resistor R31; pin 2 of chip U4 is grounded; pin 3 of chip U4 is connected to ground via series with capacitor C6; pin 3 of chip U4 is also connected to the VCC power supply terminal; pin 3 of chip U4 is connected to the positive terminal of coupling capacitor C7; pin 4 of chip U4 is connected to the positive terminal of coupling capacitor C13; and pin 4 of chip U4 is connected to the positive terminal of coupling capacitor C8. The terminals are connected as follows: pin 4 of chip U4 is connected in series with capacitor C9 to ground; pin 4 of chip U4 serves as the VCC power supply terminal; the negative terminals of coupling capacitors C7, C8, and C13 are grounded; pins 5, 6, 7, and 8 of chip U4 are connected in parallel; pin 5 of chip U4 is connected in series with resistor R30 and the anode of diode D53; the anode of diode D53 is connected to the external power input terminal; the anode of diode D53 is connected in series with thermistor R24 and grounded; the anode of diode D53 is connected in series with capacitor C2 and grounded; and the anode of diode D53 is connected in series with fuse F1 and connected to the external power input terminal.
[0053] The full-wave heating temperature measurement method of this utility model's full-wave heating temperature measurement circuit is as follows:
[0054] 1. During the heating phase, the main control module continuously outputs a high level to the bidirectional thyristor Q4, which remains on, thus ensuring that the double-wire heating temperature measurement module heats up in both the positive and negative half-cycles, achieving full-wave heating. After the main control module waits for the zero potential to arrive at the INPUTSIGNAL terminal of the zero potential detection module, it delays for 3ms to detect the ADC value at the AD_PTC terminal of the double-wire heating temperature measurement module. The current temperature is calculated using the ADC value at the AD_PTC terminal (this is based on the NTC / PTC characteristics of the heating element, and the temperature corresponding to the resistance value can be obtained by looking up a table). Therefore, temperature measurement is only performed during the positive half-cycle.
[0055] 2. During the constant temperature phase, heating is selected within one positive half-cycle. During heating, the main control module outputs a high level to the bidirectional thyristor Q4, turning on the thyristor Qc. The main control module waits for the zero potential to arrive at the INPUTSIGNAL terminal of the zero potential detection module. Then, after a 3ms delay, the main control module detects the ADC value at the AD_PTC terminal of the double-layer wire heating temperature measurement module. During other times, the main control module outputs a low level to the bidirectional thyristor Q4, turning off the thyristor Qc, thus preventing the double-layer wire heating temperature measurement module from heating at other times. When the temperature during the constant temperature phase falls below the set temperature, the heating phase begins.
[0056] In the full-wave heating temperature measurement circuit of this utility model, taking 1 second as an example in the constant temperature stage, with the power grid frequency of 50Hz, there are 50 full waves in 1 second, each full wave lasting 20ms. Therefore, in the constant temperature stage, only 20ms are used for temperature measurement and heating, while the other 49 full waves do not heat up for temperature measurement.
[0057] This full-wave heating temperature measurement circuit can achieve full-wave heating, increase the power factor of the product, reduce power grid interference, reduce power loss in power supply lines, and also reduce costs and simplify the circuit.
[0058] Example 2
[0059] A full-wave heating temperature measurement circuit, with other features the same as in Embodiment 1, further includes the following features: chip U3 is model FT61F145-TRB; resistors R38 and R39 are 470kΩ 1%; resistor R40 is 7.5K 1%; resistor R41 is 10K 1%; capacitors C1, C22, and C23 are model 101; the bidirectional thyristor Q4 is model BT136-800D; resistors R12 and R15 are model 150R; resistor R37 is model 5.1K; resistor R47 is model 200mΩ 1%; Zener diode D1 is model ZMM5V1-M; resistors R2 and R3 are model 510kΩ; and resistor R23 is model 5.1K. 1%, capacitors C9, C6, C12, and C11 are of model 104, thermistor RT1 is of model 10K F3950, resistor R30 is of model 5.1R, resistor R31 is of model NC, diode D53 is of model A7, thermistor R24 is of model 7D471K, capacitor C2 is of model 104K X2, coupling capacitor C7 is of model 220uF 10V, coupling capacitors C13 and C8 are of model 220uF 25V, and fuse F1 is of model T2.5A.
[0060] Compared with Example 1, the components of the full-wave heating temperature measurement circuit in this example are all commercially available components, thus having the advantage of low production cost.
[0061] Example 3
[0062] A heating device is provided with a full-wave heating temperature measurement circuit as described in Example 1. The heating device is a heating pad, electric blanket, or therapeutic blanket.
[0063] This heating appliance uses a full-wave heating temperature measurement circuit, which enables full-wave heating, increases the product's power factor, reduces grid interference, reduces power loss in power supply lines, and also reduces costs and simplifies the circuit.
[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.
Claims
1. A full-wave heating temperature measurement circuit, characterized in that: The system includes a reference voltage input module for improving temperature measurement accuracy by eliminating the influence of mains voltage, a double-layer wire heating temperature measurement module for full-wave heating, and a main control module. The AD_VOL terminal of the reference voltage input module is connected to the main control module, the main control module is connected to the LOAD_C terminal of the double-layer wire heating temperature measurement module, and the main control module is connected to the AD_PTC terminal of the double-layer wire heating temperature measurement module.
2. The full-wave heating temperature measurement circuit according to claim 1, characterized in that: The reference voltage input module is equipped with resistors R38, R39, R40, R41 and capacitor C23. One end of resistor R40, one end of resistor R41 and one end of capacitor C23 are connected to ground in parallel. The other ends of resistor R40, the other ends of resistor R41 and the other ends of capacitor C23 are connected in parallel as the AD_VOL terminal. The other end of resistor R40 is also connected in series with resistors R39 and R38 to the external power input terminal.
3. The full-wave heating temperature measurement circuit according to claim 2, characterized in that: The double-wire heating and temperature measurement module includes an outer wire, an inner wire, a bidirectional thyristor Q4, resistors R12, R15, R37, R47, and capacitor C22. The T1 terminal of the bidirectional thyristor Q4 is connected in series with the outer wire and the inner wire to the external power input terminal. The T2 terminal of the bidirectional thyristor Q4 is connected to ground in series with resistor R47. The G terminal of the bidirectional thyristor Q4 is connected to the LOAD_C terminal in series with resistor R12 as the LOAD_C terminal and connected to the main control module. The G terminal of the bidirectional thyristor Q4 is connected to the main control module in series with resistor R37 as the AD_PTC terminal, and the AD_PTC terminal is connected to ground in series with capacitor C22. The two ends of resistor R15 are connected to the G terminal and the T2 terminal of the bidirectional thyristor Q4, respectively.
4. The full-wave heating temperature measurement circuit according to claim 3, characterized in that: It is also equipped with a zero potential detection module, the INPUTSIGNAL terminal of which is connected to the main control module.
5. The full-wave heating temperature measurement circuit according to claim 4, characterized in that: The zero potential detection module is equipped with a Zener diode D1, resistors R2 and R3, and a capacitor C1. The negative terminal of the Zener diode D1 is connected to the external power input terminal via resistors R3 and R2 in series. The negative terminal of the Zener diode D1 is connected to the main control module as the INPUTSIGNAL terminal. The positive terminal of the Zener diode D1 is grounded. One end of the capacitor C1 is connected to the negative terminal of the Zener diode D1, and the other end of the capacitor C1 is connected to the positive terminal of the Zener diode D1.
6. The full-wave heating temperature measurement circuit according to claim 5, characterized in that: It also includes an internal ambient temperature detection module, a button module, and a display module, which are respectively connected to the main control module.
7. The full-wave heating temperature measurement circuit according to claim 6, characterized in that: The internal ambient temperature detection module is equipped with a resistor R23, a capacitor C11 and a thermistor RT1. One end of the capacitor C11 is connected to the main control module, and the other end of the capacitor C11 and one end of the thermistor RT1 are connected to ground in parallel. The other end of the thermistor RT1 is connected to the VCC power supply terminal in series with the resistor R23. The button module is equipped with switches SW1, SW2 and SW3. Pins 1 and 2 of switch SW1 are connected to the main control module, pins 1 and 2 of switch SW2 are connected to the main control module, pin 1 of switch SW2 is connected to the main control module, pins 3 and 4 of switch SW1 are grounded, pins 3 and 4 of switch SW2 are grounded, and pins 3 and 4 of switch SW3 are grounded. The display module is equipped with LEDs LED3, LED4, LED5, LED6, LED7, LED8, LED9, LED10, LED11, LED12, LED13, and LED14. The negative terminals of LEDs LED3, LED4, LED5, LED6, LED7, and LED13 are connected in parallel and connected to the main control module. The positive terminals of LEDs LED3 and LED4 are... The positive terminals of LED5, LED6, LED7, and LED8 are respectively connected to the main control module. The negative terminals of LED11, LED10, LED9, LED8, LED12, and LED14 are connected in parallel and connected to the main control module. The positive terminals of LED11, LED10, LED9, LED8, LED12, and LED14 are respectively connected to the main control module.
8. The full-wave heating temperature measurement circuit according to claim 7, characterized in that: The main control module includes a chip U3 and a capacitor C12. Pin 1 of chip U3 is connected in series with capacitor C12 to the VCC power supply terminal. Pin 1 of chip U3 is grounded. Pin 20 of chip U3 is connected to the 5V power supply terminal. Pin 2 of chip U3 is connected to the negative terminals of LED13 and LED14. Pin 3 of chip U3 is connected to the negative terminals of LED3 and LED11. Pin 4 of chip U3 is connected to the negative terminals of LED4 and LED10. Pin 5 of chip U3 is connected to the negative terminals of LED5 and LED9. Pin 6 of chip U3 is connected to the negative terminals of LED6 and LED8. Pin 7 of chip U3 is connected to the negative terminals of LED7 and LED12. Pin 9 of chip U3 is connected to the negative terminals of LED3 and LED4. The negative terminals of LEDs 1, 2, 3, 4, 5, 6, 7, and 13 are connected. Pin 9 of chip U3 is connected to the AD_VOL terminal. Pin 10 of chip U3 is connected to pins 1 and 2 of switch SW2. Pin 18 of chip U3 is connected to the negative terminals of LEDs 11, 10, 9, 8, 12, and 14. Pin 17 of chip U3 is connected to pins 1 and 2 of switch SW1. Pin 16 of chip U3 is connected to one end of capacitor C11. Pin 15 of chip U3 is connected to the AD_PTC terminal. Pin 13 of chip U3 is connected to pin 1 of switch SW3. Pin 12 of chip U3 is connected to the LOAD_C terminal. Pin 11 of chip U3 is connected to the INPUTSIGNAL terminal.
9. The full-wave heating temperature measurement circuit according to claim 8, characterized in that: A step-down module for powering the main control module is also provided. This step-down module includes a chip U4, resistors R30 and R31, a diode D53, a thermistor R24, capacitors C2, C6, and C9, coupling capacitors C7, C8, and C13, and a fuse F1. Pin 1 of chip U4 is connected to ground via series resistor R31, pin 2 of chip U4 is grounded, pin 3 of chip U4 is connected to ground via series capacitor C6, pin 3 of chip U4 is also connected to the VCC power supply terminal, pin 3 of chip U4 is connected to the positive terminal of coupling capacitor C7, and pin 4 of chip U4 is connected to the positive terminal of coupling capacitor C13. Pin 4 is connected to the positive terminal of coupling capacitor C8. Pin 4 of chip U4 is connected in series with capacitor C9 and grounded. Pin 4 of chip U4 serves as the VCC power supply terminal. The negative terminals of coupling capacitors C7, C8, and C13 are grounded. Pins 5, 6, 7, and 8 of chip U4 are connected in parallel. Pin 5 of chip U4 is connected in series with resistor R30 and the positive terminal of diode D53. The positive terminal of diode D53 is connected to the external power input terminal. The positive terminal of diode D53 is connected in series with thermistor R24 and grounded. The positive terminal of diode D53 is connected in series with capacitor C2 and grounded. The positive terminal of diode D53 is connected in series with fuse F1 and connected to the external power input terminal.
10. The full-wave heating temperature measurement circuit according to claim 9, characterized in that: The outer filament and the inner filament are separated from each other by a molten layer.
Citation Information
Patent Citations
Automatic electric blanket adjusts temperature
CN205597633U