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A dry burning judgment method applied to ptc heating equipment

A technology of heating equipment and dry burning, which is applied in the direction of thermometers, ohmic resistance heating, and ohmic resistance heating parts that are directly sensitive to heat, electric/magnetic elements, etc., which can solve the problems of increasing equipment costs and achieve the effect of reducing costs

Active Publication Date: 2021-07-13
GUANGDONG TONZE ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need to set up special temperature control or temperature measurement devices, the equipment cost is increased

Method used

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  • A dry burning judgment method applied to ptc heating equipment
  • A dry burning judgment method applied to ptc heating equipment
  • A dry burning judgment method applied to ptc heating equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In the present embodiment, the dry burning judgment method applied to PTC heating equipment is characterized in that:

[0041] refer to figure 1 , connect the PTC heating device with the power line and the main control chip in the following way: one end of the PTC heating device (PTCheater) is connected to the live wire L, the other end of the PTC heating device is connected to the end of the resistor R1, and the other end of the resistor R1 is controlled by The silicon SC is connected to the neutral line N; the control electrode of the thyristor SC is connected to the corresponding control signal output terminal of the main control chip (the main control chip is not shown in the figure), and the connection between the PTC heating device and the resistor R1 is used as a temperature signal The detection terminal (Temp Signal), the temperature signal detection terminal is connected to the corresponding signal input terminal of the main control chip;

[0042] The main con...

Embodiment 2

[0058] The circuit connection of this embodiment is the same as that of Embodiment 1. The difference from the embodiment is that in this embodiment, the main control chip does not have an analog / digital converter (that is, the main control chip does not have an analog / digital conversion function. For example, the main control chip can be the chip HT68F003 produced by Holtek. ), the steps to judge whether the PTC heating equipment is in a dry state are as follows:

[0059] (1') Detect the voltage of the temperature signal detection terminal at all times;

[0060] (2') Use the timer to count for 1 second, and judge whether a predetermined number of (such as 100) voltage reversals can be detected every 1 second;

[0061] If the predetermined number of voltage reversals cannot be detected, add 1 to the accumulator of dry burning faults, and enter step (3');

[0062] If a predetermined number of voltage reversals can be detected, return to step (1');

[0063] (3') Judging whethe...

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Abstract

A dry burning judgment method applied to PTC heating equipment, characterized in that: one end of the PTC heating equipment is connected to a live wire, the other end of the PTC heating equipment is connected to one end of a resistor, and the other end of the resistor is connected to a zero line through a thyristor; The control electrode of the silicon-controlled silicon is connected to the corresponding control signal output terminal of the main control chip, and the connection between the PTC heating device and the resistor is used as the temperature signal detection terminal, and the temperature signal detection terminal is connected to the corresponding signal input terminal of the main control chip; the main control chip Obtain the electrical signal of the temperature signal detection terminal, compare it with the preset threshold value after processing, and judge whether the PTC heating device is in a dry state according to the comparison result; the main control chip sends a signal through the control signal output terminal to control the flow of the thyristor. Off state to control whether the PTC heating equipment is powered on. The invention can accurately judge whether the PTC heating equipment is in a dry burning state, saves special temperature control or temperature measuring devices, and is beneficial to reduce costs.

Description

technical field [0001] The invention relates to the technical field of electric heating equipment, in particular to a method for judging dry burning applied to PTC heating equipment. Background technique [0002] Existing heating equipment generally uses special temperature control or temperature measuring devices (such as thermistors, thermostats, thermocouples, infrared temperature measurement, etc.) to detect the temperature of heated objects (such as containers used to accommodate food materials), By judging whether the temperature has risen abnormally, and then judging whether the heating equipment is in a dry state, and controlling the power supply of the heating equipment to prevent dry burning and accidents. Since special temperature control or temperature measurement devices need to be set, the equipment cost is increased. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a dry-burning judging method appl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/18G01K7/20G01K1/02H05B1/02H05B3/00H05B3/02
CPCG01K7/183G01K7/20G01K1/02H05B1/0202H05B3/0014H05B3/0019H05B3/02
Inventor 詹捷辉詹文杰吕全彬
Owner GUANGDONG TONZE ELECTRIC CO LTD
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