CN201732267U

CN201732267U - High-power hot air gun embedded circuit system based on single chip microcomputer control

Info

Publication number: CN201732267U
Application number: CN200920048907XU
Authority: CN
Inventors: 王宁; 王亦超
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-10-30
Filing date: 2009-10-30
Publication date: 2011-02-02
Anticipated expiration: 2019-10-30

Abstract

The utility model relates to a high-power hot air gun embedded circuit system based on single chip microcomputer control, which is capable of leading a hot air gun to work intelligently and controlling and displaying air outlet temperature and volume via an LCD in real time, and brings convenience for a hot air gun user to timely and effectively control and observe hot air gun air outlet temperature and volume on demand. The circuit system includes a thermocouple sensor sampling circuit (6), a temperature converter circuit (7), a decoupling circuit (8), a low-pass filter circuit (9), a single chip microcomputer circuit (11), a display drive circuit (14), an LDC display circuit (15) and the like.

Description

Based on monolithic processor controlled high-power heat gun flush type circuit system

One, technical field

The utility model belongs to electric tool, relates to a kind of based on monolithic processor controlled high-power heat gun flush type circuit system.

Two, background technology

In existing domestic heat gun control system, only realize the temperature of heater is controlled with traditional electronic circuit and Traic.This control circuit is low precision not only, and can not show actual air outlet temperature and air quantity in real time, more can not realize intelligent controlling.Thereby can't improve heat gun service property (quality) and work efficiency, cause waste of energy.

Three, summary of the invention

The purpose of this utility model be to overcome existing heat gun control system can't realize Based Intelligent Control and in real time LCD demonstrate the deficiency of draught temperature and air quantity, provide a kind of based on monolithic processor controlled flush type circuit system.The utility model can make intelligent work of heat gun and control in real time and LCD demonstrate draught temperature and air quantity, make things convenient for the heat gun user timely and effective as required, observe and control heat gun air outlet temperature and air quantity easily, thereby improve work quality and efficient, saves energy.This flush type circuit system contains: thermocouple sensor sample circuit (6) number is thermopair and the resistance R of K (t) by calibration ₄, R ₅Constitute, the temperature signal of 0-999 degree is provided, give integrated chip U simultaneously ₂AD623 provides quiescent point, and the cold junction compensation of thermopair has cold junction compensation module solution in the scm software; Converter temperature circuit (7) is by integrated chip U ₂AD623 and potentiometer W constitute, and finish temperature signal and amplify and mapping function, have the function of very strong anti-common mode interference simultaneously; Decoupling circuit (8) is by resistance R ₆And capacitor C ₇Constituting, is one of measure of this Circuits System working stability, guarantees thermocouple sensor sample circuit and converter temperature circuit operate as normal; Low-pass filter circuit (9) is by resistance R ₇And capacitor C ₈Forming, is to eliminate one of strongly disturbing measure; S in the temperature given circuit (10) ₁Button is the intensification button, S ₂It is the cooling button; Single chip circuit (11) is by single-chip microcomputer U ₃LPC915 and resistance R ₁₀Form; Display driver circuit (14) is by integrated chip U ₄PCT8562 forms, and can finish 40 * 4=160 display element, finishes the driving work of 1/3 bias voltage, 1: 4 back of the body level, 35 display elements here; LCD display circuit (15) is by U ₅LCD display is formed, it and U ₄Cooperating the LCD that finishes 3 zones to show, is respectively digital temperature viewing area, air quantity icon display zone, temperature vernier viewing area.

By software programming, the utlity model has intelligent function: startup self-detection, work and make heat gun be operated in the cold wind state first, task can be in working temperature point last time automatically, require to adopt different software versions and do not change hardware circuit, have the pattern that normal operating conditions is got back in self-starting again when out of control when heat gun is subjected to strong electromagnetic according to different heat gun series again.

Four, description of drawings

Below in conjunction with accompanying drawing the utility model is further specified.

Fig. 1 is the utility model circuit theory diagrams.Among the figure: the 1st, the work main circuit; The 2nd, the air quantity control circuit; The 3rd, the single-chip microcomputer working power circuit; The 4th, the single chip machine controlling circuit module; The 5th, EMI power supply anti-jamming circuit.

Fig. 2 is single chip machine controlling circuit module principle figure; The 6th, the thermocouple sensor sample circuit; The 7th, the converter temperature circuit; The 8th, decoupling circuit; The 9th, low-pass filter circuit; The 10th, the temperature given circuit; The 11st, single chip circuit; The 12nd, air quantity photoelectricity coupled circuit; The 13rd, work main circuit photoelectricity coupled circuit; The 14th, display driver circuit; The 15th, the LCD display circuit.

Five, embodiment

As shown in Figure 2, measure conversion in real time by 6 pairs of heat gun air outlets of thermocouple sensor sample circuit temperature, the simulating signal that converter temperature circuit 7 receives conversion amplify with conversion after deliver to low-pass filter circuit 9, filtered signal send single-chip microcomputer to carry out A/D sampling, digital filtering and scale transformation.Decoupling circuit 8 is the power filters that guarantee thermocouple sensor sample circuit 6 and converter temperature circuit 7.Low-pass filter circuit 9 is used for weakening the work undesired signal.S in the temperature given circuit 10 ₁Button is the intensification button, S ₂It is the cooling button.The step size of lifting/lowering temperature is by heat gun power and air quantity control decision.Single chip circuit 11 is control centers of the utility model circuit, carries out intellectuality and controls and send shows signal in real time.Photoelectric coupled circuit 12 and 13 realizes forceful electric power and the isolation of controlling light current in air quantity control circuit and the work main circuit respectively, guarantees that handling safety and control are normal.Display driver circuit 14 is implemented I with single-chip microcomputer ²C signal transmission will be controlled and send to the LCD display circuit after temperature value and air quantity are deciphered.Display circuit 15 is LCD display parts of customization.Be made of three zones: the temperature viewing area is made up of 3 integers, shows the 000-999 degree.The air quantity viewing area is made up of three fan blade icons, the weak wind of fan blade icon representation, two medium air quantity of fan blade icon representation, three fan blade icon representation high wind amounts.Temperature vernier viewing area: intensification arrow and cooling arrow are arranged, 12 sections little entity squares are arranged in the middle of two arrows.When temperature raise, per 21 group of 12 sections entity blockage dynamically showed bright from left to right, and the arrow that heats up simultaneously flicker shows bright, and frequency is 0.5S.When temperature descended, 12 sections entity blockages dynamically showed bright for per 21 group from right to left, and the arrow of lowering the temperature simultaneously flicker shows bright, and frequency is 0.5S.LED is a relay indicating light in Fig. 2 circuit, shows that control circuit is working properly.

In Fig. 1 circuit, the 1st, the work main circuit, the pwm signal of being sent by single-chip microcomputer is through 13 couples of Traic of photoelectric coupled circuit ₁Thereby control control electric furnace heating wire heat.The 2nd, the air quantity control circuit, the pwm signal of being sent by single-chip microcomputer passes through Traic through photoelectric coupled circuit 12 ₂The air quantity motor is implemented pressure regulation output control air quantity, and the air quantity size is solved by software module with the coordination of electric furnace heating wire watt level.The 3rd, the single-chip microcomputer working power circuit provides the single chip machine controlling circuit power supply.The 4th, the single chip machine controlling circuit module realizes intelligence and control in real time.The 5th, the power-supply filter of this Circuits System is to eliminate EMI.

Claims

1. one kind based on monolithic processor controlled high-power heat gun flush type circuit system, it is characterized in that containing thermocouple sensor sample circuit (6), converter temperature circuit (7), decoupling circuit (8), low-pass filter circuit (9), single chip circuit (11), display driver circuit (14), LCD display circuit (15), wherein:

A, thermocouple sensor sample circuit (6) number are thermopair and the resistance R of K (t) by calibration ₄, R ₅Constitute;

B, converter temperature circuit (7) are by integrated chip U ₂AD623 and potentiometer W constitute;

C, decoupling circuit (8) are by resistance R ₆And capacitor C ₇Constitute;

D, low-pass filter circuit (9) are by resistance R ₇And capacitor C ₈Constitute;

E, single chip circuit (11) are by single-chip microcomputer U ₃LPC915 and resistance R ₁₀Constitute;

F, display driver circuit (14) are by integrated chip U ₄PCT8562 constitutes;

G, LCD display circuit (15) are by U ₅LCD display constitutes.