CN104853500A

CN104853500A - Lighting circuit used for operating table

Info

Publication number: CN104853500A
Application number: CN201510275171.XA
Authority: CN
Inventors: 不公告发明人
Original assignee: Permanent Electronic Science And Technology Co Ltd Of Suzhou Welfare
Current assignee: Permanent Electronic Science And Technology Co Ltd Of Suzhou Welfare
Priority date: 2015-05-26
Filing date: 2015-05-26
Publication date: 2015-08-19

Abstract

The invention discloses a lighting circuit used for an operating table. The circuit comprises a transformer W, a MOS tube V1, a photosensitive diode D3, a chip IC2, and a lamp fixture H. The lighting circuit used for an operating table is simple in structure and few in elements. When luminous efficiency of a lighting fixture is reduced because of aging or other reasons, the circuit feeds back in time, voltage output on the lamp fixture is increased, so as to effectively ensure luminous intensity of the lamp fixture, preventing frequent changing of the operating table lighting fixture caused by luminance reduction, and saving use cost.

Description

A kind of lighting circuit for operating table

Technical field

The present invention relates to a kind of lighting circuit, specifically a kind of lighting circuit for operating table.

Background technology

Operating table is the important place being related to life security, carrying out there is slight offset in the process of performing the operation, all likely cause irremediable fault, therefore, the brightness of illumination of operating table requires very high, usually the form of optically focused is all taked to carry out light supply, but light fixture can exist aging when long-time use, thus cause luminous efficiency to reduce, traditional mode regularly carries out quality inspection to the lighting of operating table, timely replacing, thus cause very large expense expenditure, be unfavorable for cost-saving.

Summary of the invention

The object of the present invention is to provide that a kind of structure is simple, the lighting circuit for operating table of stable performance, to solve the problem proposed in above-mentioned background technology.

For achieving the above object, the invention provides following technical scheme:

A kind of lighting circuit for operating table, comprise transformer W, metal-oxide-semiconductor V1, photodiode D3, chip IC 2 and light fixture H, the two ends of the winding L 1 of described transformer W connect the two ends of 220VAC respectively, one end of the winding L 2 of transformer W connects 1 port of electric capacity C1 and rectifier bridge T, the other end of the winding L 2 of transformer W connects the other end of electric capacity C1 and 3 ports of rectifier bridge T, 2 ports of rectifier bridge T connect 1 pin of chip IC 1, 2 pin ground connection of chip IC 1, 3 pin connecting valve S1 of chip IC 1, the drain electrode of metal-oxide-semiconductor V1 and 5 pins of chip IC 2, 4 ports of rectifier bridge T connect electric capacity C2, electric capacity C4, electric capacity C5, the anode of diode D2, a stiff end of potentiometer RP1 and 8 pins of chip IC 2 ground connection, 1 pin contact resistance R2 of chip IC 2, the other end of electric capacity C2 and the negative electrode of photodiode D3, the anode of photodiode D3 connects the sliding end of potentiometer RP1, another stiff end contact resistance R1 of potentiometer RP1, 3 pins of electric capacity C3 and chip IC 2, the other end of resistance R1 connects the other end of electric capacity C3 and 2 pins of chip IC 2, the other end of resistance R2 connects the other end of electric capacity C4 and 4 pins of chip IC 2, 6 pin contact resistance R3 of chip IC 2, the other end of resistance R3 connects the negative electrode of diode D1 and the grid of metal-oxide-semiconductor V1, the source electrode of metal-oxide-semiconductor V1 connects the anode of diode D1, the negative electrode of diode D2 and inductance L 1, the other end of inductance L 1 connects the other end of light fixture H, 7 pins of chip IC 2 connect the other end of electric capacity C5 and the other end of switch S 1.

As preferred version of the present invention: described chip IC 1 is 7805 three terminal regulators, and chip IC 2 is UC3842 pulse width modulator.

As preferred version of the present invention: described light fixture H is LED spotlight.

Compared with prior art, the invention has the beneficial effects as follows: the lighting circuit structure of operating table of the present invention is simple, components and parts are few, when lighting causes luminous efficiency to reduce because of aging or other reasons, circuit makes feedback in time, increase and the voltage of light fixture is exported, thus effectively guarantee the luminous intensity of light fixture, avoid the frequent replacing that operating table lighting causes because brightness reduces, save use cost.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of the lighting circuit for operating table.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

Refer to Fig. 1, in the embodiment of the present invention, a kind of lighting circuit for operating table, comprise transformer W, metal-oxide-semiconductor V1, photodiode D3, chip IC 2 and light fixture H, the two ends of the winding L 1 of described transformer W connect the two ends of 220VAC respectively, one end of the winding L 2 of transformer W connects 1 port of electric capacity C1 and rectifier bridge T, the other end of the winding L 2 of transformer W connects the other end of electric capacity C1 and 3 ports of rectifier bridge T, 2 ports of rectifier bridge T connect 1 pin of chip IC 1, 2 pin ground connection of chip IC 1, 3 pin connecting valve S1 of chip IC 1, the drain electrode of metal-oxide-semiconductor V1 and 5 pins of chip IC 2, 4 ports of rectifier bridge T connect electric capacity C2, electric capacity C4, electric capacity C5, the anode of diode D2, a stiff end of potentiometer RP1 and 8 pins of chip IC 2 ground connection, 1 pin contact resistance R2 of chip IC 2, the other end of electric capacity C2 and the negative electrode of photodiode D3, the anode of photodiode D3 connects the sliding end of potentiometer RP1, another stiff end contact resistance R1 of potentiometer RP1, 3 pins of electric capacity C3 and chip IC 2, the other end of resistance R1 connects the other end of electric capacity C3 and 2 pins of chip IC 2, the other end of resistance R2 connects the other end of electric capacity C4 and 4 pins of chip IC 2, 6 pin contact resistance R3 of chip IC 2, the other end of resistance R3 connects the negative electrode of diode D1 and the grid of metal-oxide-semiconductor V1, the source electrode of metal-oxide-semiconductor V1 connects the anode of diode D1, the negative electrode of diode D2 and inductance L 1, the other end of inductance L 1 connects the other end of light fixture H, 7 pins of chip IC 2 connect the other end of electric capacity C5 and the other end of switch S 1.

Chip IC 1 is 7805 three terminal regulators, and chip IC 2 is UC3842 pulse width modulator.

Light fixture H is LED spotlight.

Operation principle of the present invention is: 220V line voltage becomes galvanic current to circuit supply after transformer W, rectifier bridge T and three terminal regulator IC1, chip IC 2 is single-ended Switching Power Supply control chips, its 1 pin is internal error amplifier out, and be connected to negative feedback network between 2 pin, to determine the gain of error amplifier.2. pin is sampling voltage input, and sampling voltage compares with inner 2.5V reference voltage, produces control voltage, controls output pulse width.3 pin are overload protection control ends, and when voltage is more than 1V, 6 pin stop exporting, and in circuit, as light open and close control end, the external timing element of 4 pin, determines frequency of oscillation.6 pin are that pulse exports, driving force 1A.When light fixture H causes luminous efficiency to reduce because of aging or other reasons, photodiode D3 internal resistance increases, and 2 pin voltages of chip IC 2 reduce, and the pulse duration that 6 pin export increases, the voltage that circuit exports increases, and strengthens by making light fixture H luminous intensity after metal-oxide-semiconductor V1 and inductance L 1.Realize thus compensating in time the luminous intensity of operating table lighting, guarantee illumination intensity.

Claims

1. the lighting circuit for operating table, comprise transformer W, metal-oxide-semiconductor V1, photodiode D3, chip IC 2 and light fixture H, it is characterized in that, the two ends of the winding L 1 of described transformer W connect the two ends of 220VAC respectively, one end of the winding L 2 of transformer W connects 1 port of electric capacity C1 and rectifier bridge T, the other end of the winding L 2 of transformer W connects the other end of electric capacity C1 and 3 ports of rectifier bridge T, 2 ports of rectifier bridge T connect 1 pin of chip IC 1, 2 pin ground connection of chip IC 1, 3 pin connecting valve S1 of chip IC 1, the drain electrode of metal-oxide-semiconductor V1 and 5 pins of chip IC 2, 4 ports of rectifier bridge T connect electric capacity C2, electric capacity C4, electric capacity C5, the anode of diode D2, a stiff end of potentiometer RP1 and 8 pins of chip IC 2 ground connection, 1 pin contact resistance R2 of chip IC 2, the other end of electric capacity C2 and the negative electrode of photodiode D3, the anode of photodiode D3 connects the sliding end of potentiometer RP1, another stiff end contact resistance R1 of potentiometer RP1, 3 pins of electric capacity C3 and chip IC 2, the other end of resistance R1 connects the other end of electric capacity C3 and 2 pins of chip IC 2, the other end of resistance R2 connects the other end of electric capacity C4 and 4 pins of chip IC 2, 6 pin contact resistance R3 of chip IC 2, the other end of resistance R3 connects the negative electrode of diode D1 and the grid of metal-oxide-semiconductor V1, the source electrode of metal-oxide-semiconductor V1 connects the anode of diode D1, the negative electrode of diode D2 and inductance L 1, the other end of inductance L 1 connects the other end of light fixture H, 7 pins of chip IC 2 connect the other end of electric capacity C5 and the other end of switch S 1.

2. the lighting circuit for operating table according to claim 1, is characterized in that, described chip IC 1 is 7805 three terminal regulators, and chip IC 2 is UC3842 pulse width modulator.

3. the lighting circuit for operating table according to claim 1, is characterized in that, described light fixture H is LED spotlight.