Iron heating disc circulating relay heating method

Abstract

The invention discloses a circulating relay heating method for an iron heating disc, which comprises the following steps of: when heating for the first time, performing bidirectional conduction on a silicon controlled rectifier, and heating to 150-160 DEG C at full power; then the silicon controlled rectifier is turned into one-way conduction, heating continues to be conducted to 185-190 DEG C with the power of 50%, heating is stopped, and the first punching temperature is controlled to be 220 DEG C; when the temperature drops to 170 DEG C, the silicon controlled rectifier is started again for one-way conduction, heating is stopped when a certain temperature is reached, the temperature is stabilized at 210 DEG C, when the iron is in a steam release state and when the temperature drops to 170 DEG C, the silicon controlled rectifier is connected for heating by 50% power in one way, and after the temperature sensed by the NTC is intelligently analyzed by the MCU in different heating periods of the heating disc, the temperature is controlled to be constant. The silicon controlled rectifier is controlled to be all-on or half-on, and full-power and half-power cyclic heating is adopted; the first heating time is shortened, and the first punching temperature of the bottom plate is reduced; the bottom plate temperature difference is reduced; the problems of steam cutoff and water dripping of the bottom plate are solved.

Description

Technical Field

[0001] The present invention relates to the field of iron hot plate heating methods, and particularly to a cyclic relay heating method for an iron hot plate. Background Art

[0002] In the existing iron heating technology system, it is common to use a thermostat or a PCB board relay for heating control. When the hot plate starts heating from the cold state, it first raises the temperature to 170 - 180 degrees at full power, and then stops heating. Depending on the inertia of heat conduction, the temperature will rush to the first impact temperature of about 250 degrees. Then, when the temperature drops to the lower limit temperature of 150 - 160 degrees, it is powered on and heated at full power again. When the temperature reaches 170 - 180 degrees, it stops again, and finally the target temperature of 210 degrees is achieved. However, this traditional heating method has many drawbacks. On the one hand, the heating process takes a long time, and the first impact temperature is too high. On the other hand, when the iron releases steam, once the temperature reaches 170 - 180 degrees, the relay or thermostat stops heating until the temperature drops to the lower limit before reconnecting. Moreover, due to continuous addition of cold water, the temperature of the iron soleplate drops sharply, resulting in uneven temperature distribution on the soleplate and too large a temperature difference. When the soleplate is in a low-temperature state, it is extremely easy to have poor vaporization, which in turn leads to water dripping, and even short-term steam interruption, seriously affecting the ironing experience and effect. In view of this, the present invention innovatively proposes a cyclic relay heating method for an iron hot plate to solve the above problems. Summary of the Invention

[0003] In order to overcome the above defects in the prior art, the present invention provides a cyclic relay heating method for an iron hot plate. In different stages of hot plate heating, with the help of the precise temperature sensing of the NTC, the obtained temperature data is transmitted to the MCU for intelligent analysis and processing. Then, the MCU controls the thyristor to achieve the switching between the fully conducting state and the half-conducting state, adopting a heating mode of alternating full power and half power in a cycle. This can significantly shorten the first heating duration, effectively reduce the first impact temperature of the soleplate, reduce the temperature difference of the soleplate, fundamentally solve the problems of steam interruption and water dripping on the soleplate, and comprehensively improve the performance and use experience of the iron.

[0004] Technical Solution

[0005] A cyclic relay heating method for an iron hot plate includes the following stages:

[0006] Stage 1, the first heating stage: When the first heating is started, the thyristor is set to the bidirectional conduction state, and the hot plate is heated at full power until the temperature reaches 150 - 160 °C. During this process, the NTC monitors the temperature of the hot plate in real time. When it detects that the hot plate starts to heat up from room temperature, the MCU immediately sends a bidirectional trigger signal to the thyristor to make the thyristor conduct bidirectionally and achieve full-power heating to the target temperature range;

[0007] Phase II: Heating Transition Stage: When the temperature reaches 150 - 160°C, the resistance value of the NTC decreases due to temperature change. After the MCU receives this signal change, it sends a one-way trigger signal to the thyristor, and the thyristor then changes to a one-way conduction state. At this time, the heating plate continues to heat at 50% power until the temperature reaches 185 - 190°C, and then stops heating, accurately controlling the first charge temperature at 220°C;

[0008] Phase III: Temperature Stabilization Stage: When the temperature drops from the peak of the heating transition stage to 170°C, the thyristor is started to conduct unidirectionally again, and continues to heat until it reaches 185°C and then stops heating, so that the temperature of the heating plate is stably maintained at 210°C;

[0009] Phase IV: Steam Release Stage: When the iron is in the steam release state, once the temperature drops to 170°C, the thyristor is connected unidirectionally and heats at 50% power. When the temperature cannot reach 185°C within 15 seconds, the MCU will quickly control the thyristor to switch from unidirectional conduction to bidirectional conduction, that is, full power heating is used until the temperature reaches 185°C, and then it switches back to unidirectional conduction to supplement heat at 50% power. When the temperature reaches 190°C, heating stops.

[0010] Beneficial Effects

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] In each period of heating of the heating plate, through the precise perception of temperature by the NTC and the intelligent analysis and calculation by the MCU, the thyristor is accurately controlled to be fully on or half on, realizing efficient cyclic heating of full power and half power. This technological innovation greatly shortens the first heating time, effectively reduces the first charge temperature of the bottom plate, and optimizes the efficiency and stability of the heating process;

[0013] Effectively reduces the temperature difference of the bottom plate, ensures uniform temperature distribution of the bottom plate, greatly improves the ironing effect. At the same time, it successfully solves the problems of gas cut-off and water dripping during the steam release process of the bottom plate, ensures the continuity and stability of steam release, and significantly improves the use performance and user experience of the iron;

[0014] In the steam release scenario, due to the rapid heat dissipation caused by the injection of cold water, the temperature of the bottom plate drops rapidly. At this time, the MCU can flexibly control the bidirectional and unidirectional conduction of the thyristor according to the real-time change of temperature, accurately realizing the alternating and collaborative work of full power and 50% power heating, maintaining the temperature of the bottom plate stable within a reasonable range, not only solving the problems of steam dripping and gas cut-off caused by too low temperature, but also avoiding the negative impact of too high or too low temperature of the bottom plate on the ironing effect, comprehensively improving the performance of the iron in the steam ironing mode. Description of the Drawings

[0015] Figure 1 This is the circuit diagram of a method for cyclic relay heating of the heating plate of an iron in the present invention. Specific embodiments

[0016] To better illustrate and explain the content of the present invention, the following will be described in conjunction with the drawings and embodiments:

[0017] There is Figure 1 As shown, the present invention discloses a method for cyclic relay heating of the heating plate of an iron. During the first heating, the NTC monitors the temperature of the heating plate in real time. Once the temperature rise is detected and started, the MCU quickly sends a bidirectional trigger signal to the thyristor, and the thyristor conducts bidirectionally, heating at full power to 150 - 160 °C. When the temperature reaches this range, the change in the resistance value of the NTC triggers the MCU to send a unidirectional trigger signal, and the thyristor switches to unidirectional conduction, heating at 50% power to 185 - 190 °C, and controlling the first charging temperature to 220 °C. When the subsequent temperature drops to 170 °C, the thyristor conducts unidirectionally again, heating until it stops at 185 °C, and stabilizing the temperature at 210 °C. In the steam release state, when the temperature drops to 170 °C, the thyristor is unidirectionally connected to heat at 50% power. If the temperature does not reach 185 °C within 15 seconds, the MCU controls the thyristor to conduct bidirectionally at full power. After reaching 185 °C, it turns back to unidirectional conduction at 50% power to supplement heat, and stops heating at 190 °C.

[0018] The present invention adopts the technical path of combining NTC temperature detection with MCU program control. The MCU outputs a thyristor trigger signal, and through the bidirectional thyristor, precise control of the heating of the heating plate is achieved. In different temperature environments, the resistance value of the NTC will show a linear change characteristic. The MCU can accurately judge the actual temperature of the heating plate based on the change in the resistance value of the NTC. With the help of a pre-written program, the trigger signal can be flexibly changed at different temperature nodes to precisely control the bidirectional conduction, unidirectional conduction, or off state of the thyristor. When the thyristor conducts bidirectionally, a full sine wave power is output, that is, full power heating is achieved; when the thyristor conducts unidirectionally, a half sine wave power is output, achieving 50% power heating;

[0019] In practical applications, especially during the steam release process, the injection of cold water causes the bottom plate to cool down rapidly. The MCU, relying on the real-time monitoring and analysis of temperature changes, flexibly switches the conduction state of the thyristor, efficiently realizing the alternating cooperation of full power and 50% power heating, effectively maintaining the stability of the bottom plate temperature. This innovative technology effectively solves the problems of steam dripping and gas cut-off caused by too low temperature, and at the same time ensures that the bottom plate temperature is always within the suitable range for ironing, avoiding the adverse impact of abnormal temperature fluctuations on the ironing effect.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the technical solutions of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for cyclic relay heating of an iron heating plate, characterized in that, It includes the following stages: Stage 1, First heating stage: When the first heating is started, the thyristor is set to the bidirectional conduction state to heat the heating plate at full power until the temperature reaches 150 - 160°C. During this process, the NTC monitors the temperature of the heating plate in real time. When it detects that the heating plate starts to heat up from room temperature, the MCU immediately sends a bidirectional trigger signal to the thyristor to prompt the thyristor to conduct bidirectionally and achieve full-power heating to the target temperature range; Stage 2, Heating transition stage: When the temperature reaches 150 - 160°C, the resistance value of the NTC decreases due to temperature change. After the MCU receives this signal change, it sends a unidirectional trigger signal to the thyristor, and the thyristor then changes to the unidirectional conduction state. At this time, the heating plate continues to heat at 50% power until the temperature reaches 185 - 190°C, and then the heating stops, and the first charging temperature is accurately controlled at 220°C; Stage 3, Temperature stabilization stage: When the temperature drops from the peak value in the heating transition stage to 170°C, the thyristor is unidirectionally turned on again and continues to heat until the temperature reaches 185°C and then stops heating, so that the temperature of the heating plate is stably maintained at 210°C; Stage 4, Steam release stage: When the iron is in the steam release state, once the temperature drops to 170°C, the thyristor is unidirectionally connected and heats at 50% power. When the temperature cannot reach 185°C within 15 seconds, the MCU will quickly control the thyristor to switch from unidirectional conduction to bidirectional conduction, that is, heat at full power until the temperature reaches 185°C, and then switch back to unidirectional conduction again to supplement heat at 50% power. When the temperature reaches 190°C, the heating stops.

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