CN105559617A

CN105559617A - Dry burning preventing circuit

Info

Publication number: CN105559617A
Application number: CN201610071937.7A
Authority: CN
Inventors: 陈运阶
Original assignee: Guangdong Tonze Electric Co Ltd
Current assignee: Guangdong Tonze Electric Co Ltd
Priority date: 2016-02-02
Filing date: 2016-02-02
Publication date: 2016-05-11

Abstract

The invention relates to the technical field of dry burning prevention, in particular to a dry burning preventing circuit. According to the technical scheme, the dry burning preventing circuit comprises a temperature controller normally-closed contact, a heater, a relay normally-open contact, a second power source end and a single-chip microcomputer which are sequentially connected through a first power source end, the temperature controller normally-closed contact is located at one end of the heater and is further sequentially connected with a first divider resistor, a second divider resistor and a ground terminal, and an IO detecting line of the single-chip microcomputer is located between the first divider resistor and the second divider resistor in a connected mode. The drying burning preventing circuit has the advantages that compared with a traditional dry burning preventing circuit, the structure is simpler, it is unnecessary to add too many electronic devices, high reliability is achieved, maintenance is easy, and production cost is further reduced.

Description

A kind of anti-dry circuit

Technical field

The present invention relates to anti-dry technical field, particularly relate to a kind of anti-dry circuit.

Background technology

Anti-dry technology circuit is comparatively common circuit in the culinary cuisine electrical equipment of family expenses; traditional have to be coordinated by temperature-sensitive magnet and permanent magnet; also the circuit being coordinated single-chip microcomputer by thermistor is had; but; above-mentioned embodiment often complex structure; structure that can be often complicated may, because individual part malfunctioning, cause protected effect malfunctioning, and production cost be higher, be not suitable for applying.

Summary of the invention

The object of the present invention is to provide a kind of anti-dry circuit, specific purposes are to provide a kind of structure simple and the anti-dry technology circuit being easy to maintenance.

For achieving the above object, the present invention adopts following technical scheme: a kind of anti-dry circuit, comprise the temperature controller normally closed contact, heating element, relay normally open contact, second source end, the single-chip microcomputer that are connected successively by the first power end, it is characterized in that: one end that temperature controller normally closed contact is positioned at heating element also connects the first divider resistance, the second divider resistance, earth terminal successively, and the IO detection line of single-chip microcomputer is connected between the first divider resistance and the second divider resistance.

Further, the every 1ms of described single-chip microcomputer removes the level state judging corresponding I/O port detection line, and X*10ms is one-period, when the low level being greater than about X/10+1 time being detected, is then judged as decompression state, now belongs to dry-fire condition.

Further, be judged as decompression state time the lasting low level value that described single-chip microcomputer IO detection line detects is greater than 10ms, now belong to dry-fire condition.

Further, the voltage between the first described power end and second source end is alternating current 220V, and the first divider resistance resistance is 1M, and the second divider resistance resistance is 100k.

Further, be also connected in series by fuse between the first divider resistance with the second divider resistance.

Further, described single-chip microcomputer is provided with display module, whether is in dry-fire condition before this for display.

The invention has the advantages that: relative to traditional anti-dry circuit, structure is more simple, and need not increase too much electronic device, and reliability is high, be easy to safeguard, also further reduce production cost.

Accompanying drawing 1 is the johning knot composition of a kind of anti-dry circuit of embodiment 1.

detailed description of the invention:

Embodiment 1: with reference to Fig. 1, a kind of anti-dry circuit, comprise the temperature controller WKQ normally closed contact WKQ-1, heating element EH, relay K M normal opened contact KM-1, second source end L, the single-chip microprocessor MCU that are connected successively by the first power end N, one end that temperature controller WKQ normally closed contact WKQ-1 is positioned at heating element EH also connects the first divider resistance R3, the second divider resistance R4, earth terminal GND successively, and the IO detection line of single-chip microprocessor MCU is connected between the first divider resistance R3 and the second divider resistance R4.

Concrete, the voltage between the first power end N and second source end L is alternating current 220V, and the first divider resistance R3 resistance is 1M, and the second divider resistance R4 resistance is 100k.

In the present embodiment, the voltage of the IO detection line of single-chip microprocessor MCU is reduced to by the cooperation of the first divider resistance R3 and the second divider resistance R4 the voltage that below 5V can detect for single-chip microprocessor MCU, also can not damages single-chip microprocessor MCU.

Concrete, under the state of non-dry combustion method, the normally closed contact WKQ-1 of temperature controller WKQ is closure state, the voltage now detected due to the IO detection line of single-chip microprocessor MCU is high level, single-chip microprocessor MCU then judges non-dry-fire condition, and when for dry-fire condition, the normally closed contact WKQ-1 of temperature controller WKQ disconnects, the voltage that now the IO detection line of single-chip microprocessor MCU detects is low level, and single-chip microprocessor MCU is then judged as dry-fire condition.

In order to overcome due in testing process owing to being also low level problem when alternating voltage can be in zero point, the every 1ms of single-chip microprocessor MCU removes the level state judging corresponding I/O port detection line, X*10ms is one-period, when the low level being greater than about X/10+1 time being detected, then be judged as decompression state, now belong to dry-fire condition, concrete X is integer and is greater than 3.

Preferably, when the lasting low level value that the IO detection line of single-chip microprocessor MCU detects is greater than 10ms time, be judged as decompression state, now belong to dry-fire condition.

In order to further protect single-chip microprocessor MCU single-chip microprocessor MCU will be caused to puncture because resistance damages, further, be also connected in series by fuse between the first divider resistance R3 with the second divider resistance R4.

In order to the state of further call user's attention dry combustion method, single-chip microprocessor MCU is provided with display module, whether is in dry-fire condition before this for display.

Certainly, these are only better embodiment of the present invention, not limit the scope of application of the present invention with this, therefore, every make in the principle of the invention equivalence change all should be included in protection scope of the present invention.

Claims

1. an anti-dry circuit, comprise the temperature controller normally closed contact, heating element, relay normally open contact, second source end, the single-chip microcomputer that are connected successively by the first power end, it is characterized in that: one end that temperature controller normally closed contact is positioned at heating element also connects the first divider resistance, the second divider resistance, earth terminal successively, and the IO detection line of single-chip microcomputer is connected between the first divider resistance and the second divider resistance.

2. a kind of anti-dry circuit according to claim 1, it is characterized in that: the every 1ms of described single-chip microcomputer removes to judge the level state of corresponding I/O port detection line, X*10ms is one-period, when the low level being greater than about X/10+1 time being detected, then be judged as decompression state, now belong to dry-fire condition.

3. a kind of anti-dry circuit according to claim 2, is characterized in that: be judged as decompression state time the lasting low level value that described single-chip microcomputer IO detection line detects is greater than 10ms, now belong to dry-fire condition.

4. a kind of anti-dry circuit according to claim 1 or 2 or 3, is characterized in that: the voltage between the first described power end and second source end is alternating current 220V, and the first divider resistance resistance is 1M, and the second divider resistance resistance is 100k.

5. a kind of anti-dry circuit according to claim 1 or 2 or 3, is characterized in that: be also connected in series by fuse between the first divider resistance with the second divider resistance.

6. a kind of anti-dry circuit according to claim 1 or 2 or 3, is characterized in that: described single-chip microcomputer is provided with display module, whether is in dry-fire condition before this for display.