CN201725990U

CN201725990U - Switching plug board for automatically controlling electric soldering iron

Info

Publication number: CN201725990U
Application number: CN2010202466164U
Authority: CN
Inventors: 吕才志
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-07-02
Filing date: 2010-07-02
Publication date: 2011-01-26
Anticipated expiration: 2020-07-02

Abstract

The utility model relates to a switching plug board for automatically controlling an electric soldering iron. The switching plug board is composed of a motherboard chip, a plug jack and a trigger key, wherein the motherboard chip comprises a high voltage part and a low voltage part, the low voltage part comprises a VDD power generating circuit, a BISS0001 circuit, an optical control circuit and an overload locking protection circuit. Firstly, the direct-current low voltage part controls the switching of the high voltage part through an optoelectronic coupler, and then a checking circuit in the high voltage part detects that the load power feeds back the signal to the direct-current low voltage part through the optoelectronic coupler; and finally, the direct-current low voltage part controls the switching of the high voltage part through the optoelectronic coupler. The switching plug board is suitable for various external heating type and internal heating type soldering irons with the power of 25W to 120W; the motherboard chip adopts an integrated circuit, thus the switching plug board has the advantages of small volume, low cost, few peripheral components, simple circuit, high reliability and the like. The switching of the electric soldering iron is realized by controlling the switching (isolated with the optoelectronic coupler) of the high voltage 220V alternating current by dint of the low voltage through the optoelectronic coupler, so as to achieve the purposes of energy saving, safety and convenient application.

Description

Automatically control the switch plate of electric iron

Technical field

The utility model relates to the switch plate of a kind of automatic control electric iron (linear resistance).

Background technology

In electronic production, components and parts connect needs welding.Electric iron is the most frequently used soldering appliance.In the process that electric iron uses, following situation often takes place: the one, after electric iron was finished using, plug did not pull out, power consumption; Unplugg, very inconvenient again; The 2nd, long-time energising is unmanned again to be used, and can shorten the life-span of electric iron again; Also some security incidents can take place.

Summary of the invention

In view of above-mentioned.The purpose of this utility model is to provide a kind of switch plate of automatic control electric iron, promptly on power line, connect electric iron automatic control switch plate, after electric iron is plugged the switch plate, switch plate inside chip makes the electric iron delay working, delay time is 20 minutes, if electric iron is used always, electric iron will continual delay working, and the time of time-delay picks up counting from last use electric iron; When the electric iron transfixion, be closed automatically after 20 minutes, play energy-conservation, purpose of safety; After starting trigger switch, can realize again delay working of electric iron.

The purpose of this utility model is achieved in that

A kind of switch plate of automatic control electric iron, be to constitute by mainboard chip, jack and triggering key, the mainboard chip contains high-pressure section and low-pressure section, low-pressure section comprises VDD power generation circuit, BISS0001 circuit, light-operated circuit and the overweight locking protection circuit of load, its feature is earlier by the Kai Heguan of dc low-voltage part by photoelectrical coupler control high-pressure section, and the power that detects load by the testing circuit in the high-pressure section is given the dc low-voltage part signal feedback by photoelectrical coupler then; Remove to control the Kai Heguan of high-pressure section at last again by photoelectrical coupler by the dc low-voltage part.

The beneficial effect of advantage of the present utility model and generation is:

1, the utility model adaptation power is the various external-heats of 25W～120W and the flatiron of internal heat type different model; Wide accommodation.

2, mainboard adopts integrated chip, and peripheral circuit is few, and low in energy consumption and working stability can be realized miniaturization.

3, electric iron triggers conveniently, and is highly sensitive.

4, load is overweight, and the circuit automatic disconnection has safety protection function.

5, the switch plate is provided with many jacks, does not influence other plug operate as normal.

Description of drawings

Fig. 1 is the utility model internal structure schematic diagram.

Fig. 2 is Fig. 1 mainboard chip operation schematic diagram (among the figure: be high-pressure section in the dashed rectangle, the circuit beyond the square frame is a low-pressure section).

Fig. 3 is light-operated circuit figure.

Fig. 4 is VDD power generation circuit figure.

Fig. 5 is BISS0001 lead-in wire connection layout.

Fig. 6 is the overweight locking protection circuit of load.

Embodiment

A kind of switch plate of automatic control electric iron; be to constitute by mainboard chip 1, jack 2 and triggering key 3; mainboard chip 1 contains high-pressure section and low-pressure section, and low-pressure section comprises BISS0001 circuit, VDD power generation circuit, light-operated circuit and the overweight locking protection circuit of load.

After the switch plate connected alternating current 220V, the low-pressure section of mainboard produced VDD/5.2V direct current (see figure 4), DC power supply was provided for the BISS0001 chip.

Photo resistance cds and triode Q8 etc. form the light-operated circuit (see figure 3), and photo resistance cds is arranged in jack.When non-loaded (electric iron) is connected to the switch plate, the resistance when illumination being arranged very little (15K is following) because of photo resistance, not conducting of triode Q8, Q1 ends, so U1 does not work; After load is connected to the switch plate, because of the unglazed photograph of photo resistance, so resistance becomes very big (more than the 5M), triode Q8 conducting drags down the control utmost point of Q1, makes the Q1 conducting, so U1 (11 pin) has had operating voltage, U1 in the low-pressure section starts working, and meanwhile VDDA is the startup triggering of load by 13 pin (seeing Fig. 4-5) that trigger U1 that discharge and recharge of C2.Through chip internal amplify, relatively at last by the 2nd pin output high level (infrared outer sensing signal processor) of U1 with reference to BISS0001, make the Q7 conducting, optocoupler U2 work this moment (see figure 2) is controlled high-pressure section, and by the following two-way of the 3rd foot control system of U2:

(1) produces direct voltage VCC/5V by rectifier diode D3 (SSM34A) and voltage-stabiliser tube U4 etc., give comparator U4 power supply.

(2) make controllable silicon VT1 conducting, loaded work piece by resistance R 2.Resistance R s detects the power (electric current that the electric current that Rs passed through load just is used of load, because of they are connected in the circuit), form with voltage shows, the Rs electric current that load is used changes into very little voltage signal (Rs adopts the resistance about 0.5 Europe/2 watt) at last by diode D1 (ERA91-02) isolations, capacitor C 1 (10V/22Uf) filtering, Rd (33k) discharge, becomes metastable direct current and delivers to the 3rd pin of comparator LM393 and compare (the 4th pin is by the RC time delayed signal of Vsel voltage generation) with the 4th pin.(electric iron transfixion just) be not by the 1st pin output low level of comparator LM393 when Vsel voltage does not change.Otherwise (just the angle that moves of electric iron is greater than 15 degree when Vsel voltage changes, will cause circuits for triggering work), will cause comparator LM393 the 1st pin output high level (0.1-1.0 second) of moment, make Q2 moment conducting, Q3 moment ends, optocoupler U3 work is exported the high level of moment by the 3rd pin of U3, makes the Q5 conducting, collector electrode instantaneous trigger U1 the 13rd pin by Q5, make the U1 delay working, just make the load delay working, delay time is 20 minutes (time is adjustable).

When load delay working after 20 minutes, U1 quits work, and high-pressure section is disconnected, and realizes the disconnection of load.Under the situation of unplugg not, reactivate load if desired, trigger key 3 as long as click, just can realize again delay working of electric iron.

If there is load to be connected to the switch plate, by U1 the 2nd pin output high level time-delay 20 minutes, if Triggerless (electric iron transfixion just) during this period, the 1st pin of comparator U4 is output low level always, and optocoupler U3 does not work always, triode Q5 ends always, the 2nd pin time-delay of U1 output low level after 20 minutes, thus Q7 ends, and optocoupler U2 quits work, controllable silicon VT1 ends, and load disconnects; (when just the user uses the angle of electric iron to spend greater than 15) all can cause circuits for triggering work when the continuous trigger signal, causes load to be worked always.

Undesired when feedback signal, just to work as Vom voltage and rise to greater than 2.5V, low-pressure section BISS0001 chip quits work immediately, no control signal output, thus high-pressure section is disconnected, realize the disconnection of load, thereby protected circuit.

Protective circuit as shown in Figure 6; when load is overweight; the electric current that must cause detecting among the resistance R s increases the (electric current that the electric current that is passed through among Rs load just is used; because of they are connected in the circuit); Vsel voltage will increase; because the 6th pin of comparator U4 is connected to the reference voltage of REF/300mv; when Vsel voltage increases to voltage greater than 6 pin; the 7th pin of comparator will be exported high level immediately and make the Q4 conducting; Q3 ends; optocoupler U3 work; by optocoupler U3 the 3rd pin output 3.5V high level; (time of charging is by R4 to give C3 (10V/10uf) charging by resistance R 4 (12K-15K); the size decision of C3); at this moment Vom voltage can rise gradually; when 15 pin (REF/2.5V) voltage that rises to greater than U1; 16 pin output high level by U1 makes the Q6 conducting; at last VDDA voltage is added to the control utmost point of controllable silicon VT2 by resistance, makes controllable silicon VT2 conducting.Thereby the 8th pin voltage of U1 is dropped to below the 0.5V, and U1 will quit work, and the 2nd pin of U1 is output low level immediately, and Q7 is ended, and optocoupler U2 will quit work, VT1 ends, and load will disconnect, thereby subsequent conditioning circuit is protected.In a single day load disconnects, and this moment, controllable silicon VT2 kept conducting by pull-up resistor R5, and locking is protected, and has guaranteed the safety of circuit.

Claims

1. automatic switch plate of control electric iron, be to constitute by mainboard chip (1), jack (2) and triggering key (3), mainboard chip (1) contains high-pressure section and low-pressure section, low-pressure section comprises VDD power generation circuit, BISS0001 circuit, light-operated circuit and the overweight locking protection circuit of load, it is characterized in that, earlier by the Kai Heguan of dc low-voltage part by photoelectrical coupler control high-pressure section, the power that detects load by the testing circuit in the high-pressure section is given the dc low-voltage part signal feedback by photoelectrical coupler then; Remove to control the Kai Heguan of high-pressure section at last again by photoelectrical coupler by the dc low-voltage part.