CN205092762U - MOS controls drive circuit - Google Patents

Abstract

The utility model discloses a MOS controls drive circuit, including chip U1, resistance R1, electric capacity C1, inductance L1, transformer T, MOS pipe VT1 and MOS pipe VT2, chip U1 pin 12 VCC that connects respectively, chip U1 pin 11, chip U1 pin 8 is taken a percentage with transformer T primary, chip U1 pin 13 is connected respectively to chip U1 pin 14, electric capacity C1 and resistance R10, the resistance R10 other end is connecting resistance R9 respectively, electric capacity C4 and resistance R8, electric capacity C4 other end connecting resistance R9 and ground connection, chip U1 pin 2 is connected respectively to the resistance R8 other end, resistance R7 and electric capacity C2, the electric capacity C2 other end is the connecting resistance R7 other end and chip U1 pin 3 respectively. The utility model discloses MOS controls drive circuit adopts the control of MOS pipe cooperation chip TL494, when power VCC voltage fluctuation, can automatically regulated output voltage stabilization, and circuit structure is simple, and is with low costs, small, especially adapted using widely.

Description

A kind of MOS controls drive circuit

Technical field

The utility model relates to a kind of drive circuit, and specifically a kind of MOS controls drive circuit.

Background technology

Along with the development of power electronic technology, the work of power electronic equipment and people, the relation of life are day by day close, and electronic equipment all be unable to do without reliably power supply.DC-DC power source converter circuit utilizes modern power electronics technology, the time ratio of control switch transistor ON and shutoff, maintains a kind of power supply of regulated output voltage.DC-DC power source transducer high frequency is the direction of its development, and high frequency makes DC-DC power source transducer enter application widely, particularly in the application of high-technology field, has promoted the miniaturization of new high-tech product, lighting.How guarantee is stable export while, reduce DC-DC power source transducer volume, alleviate its weight, become the direction of research in industry.Existing a lot of DC-DC direct current boosting power all adopts UC3842 as controller chip, coordinates multiple transformer transformation, and volume is comparatively large, and cost is higher, and in addition when driving DC voltage is unstable, steady pressure of system effect is poor.

Utility model content

The purpose of this utility model is to provide a kind of MOS to control drive circuit, to solve the problem proposed in above-mentioned background technology.

For achieving the above object, the utility model provides following technical scheme:

A kind of MOS controls drive circuit, comprise chip U1, resistance R1, electric capacity C1, inductance L 1, transformer T, metal-oxide-semiconductor VT1 and metal-oxide-semiconductor VT2, described chip U1 pin 12 connects power supply VCC respectively, chip U1 pin 11, chip U1 pin 8 and the tap of transformer T primary coil, chip U1 pin 14 connects chip U1 pin 13 respectively, electric capacity C1 and resistance R10, the resistance R10 other end is contact resistance R9 respectively, electric capacity C4 and resistance R8, electric capacity C4 other end contact resistance R9 ground connection, the resistance R8 other end connects chip U1 pin 2 respectively, resistance R7 and electric capacity C2, the electric capacity C2 other end is the contact resistance R7 other end and chip U1 pin 3 respectively, chip U1 pin 7 ground connection, chip U1 pin 4 is contact resistance R1 and the electric capacity C1 other end respectively, the resistance R1 other end distinguishes contact resistance R11 and electric capacity C5 and ground connection, the electric capacity C5 other end connects chip U1 pin 5, the chip U1 pin 6 contact resistance R11 other end, the G pole of chip U1 pin 10 difference contact resistance R2 and metal-oxide-semiconductor VT1, the S pole contact resistance R2 other end respectively of metal-oxide-semiconductor VT1, diode VD3 positive pole, the S pole of metal-oxide-semiconductor VT2 and resistance R3 ground connection, the D pole of metal-oxide-semiconductor VT1 connects diode VD1 positive pole and transformer T primary coil one end respectively, diode VD1 negative pole connects diode VD3 negative pole and diode VD2 negative pole respectively, the D pole of the diode VD2 positive pole difference connection transformer T primary coil other end and metal-oxide-semiconductor VT2, the G pole contact resistance R3 other end and the chip U1 pin 9 respectively of metal-oxide-semiconductor VT2, chip U1 pin 1 connects potentiometer R5 slide plate, potentiometer R5 one end ground connection, potentiometer R5 other end contact resistance R4, the resistance R4 other end connects output VO respectively, ground capacity C3 and inductance L 1, inductance L 1 other end connects diode D1 negative pole and diode D2 negative pole respectively, diode D1 positive pole connects diode D4 negative pole and transformer T secondary coil one end respectively, the transformer T secondary coil other end connects diode D2 positive pole and diode D3 negative pole respectively, diode D3 cathode connecting diode D4 positive pole ground connection, described chip U1 model is TL494.

As further program of the utility model: described diode VD3 is voltage stabilizing didoe.

As the utility model further scheme: described power supply VCC voltage is 12V.

Compared with prior art, the beneficial effects of the utility model are: the utility model MOS controls drive circuit, metal-oxide-semiconductor is adopted to coordinate chip TL494 to control, when power supply VCC voltage fluctuation, can automatically regulation output terminal voltage stablize, circuit structure is simple, and cost is low, volume is little, is applicable to very much promoting the use of.

Accompanying drawing explanation

Fig. 1 is the circuit diagram that MOS controls drive circuit.

Embodiment

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

Refer to Fig. 1, in the utility model embodiment, a kind of MOS controls drive circuit, comprise chip U1, resistance R1, electric capacity C1, inductance L 1, transformer T, metal-oxide-semiconductor VT1 and metal-oxide-semiconductor VT2, chip U1 pin 12 connects power supply VCC respectively, chip U1 pin 11, chip U1 pin 8 and the tap of transformer T primary coil, chip U1 pin 14 connects chip U1 pin 13 respectively, electric capacity C1 and resistance R10, the resistance R10 other end is contact resistance R9 respectively, electric capacity C4 and resistance R8, electric capacity C4 other end contact resistance R9 ground connection, the resistance R8 other end connects chip U1 pin 2 respectively, resistance R7 and electric capacity C2, the electric capacity C2 other end is the contact resistance R7 other end and chip U1 pin 3 respectively, chip U1 pin 7 ground connection, chip U1 pin 4 is contact resistance R1 and the electric capacity C1 other end respectively, the resistance R1 other end distinguishes contact resistance R11 and electric capacity C5 and ground connection, the electric capacity C5 other end connects chip U1 pin 5, the chip U1 pin 6 contact resistance R11 other end, the G pole of chip U1 pin 10 difference contact resistance R2 and metal-oxide-semiconductor VT1, the S pole contact resistance R2 other end respectively of metal-oxide-semiconductor VT1, diode VD3 positive pole, the S pole of metal-oxide-semiconductor VT2 and resistance R3 ground connection, the D pole of metal-oxide-semiconductor VT1 connects diode VD1 positive pole and transformer T primary coil one end respectively, diode VD1 negative pole connects diode VD3 negative pole and diode VD2 negative pole respectively, the D pole of the diode VD2 positive pole difference connection transformer T primary coil other end and metal-oxide-semiconductor VT2, the G pole contact resistance R3 other end and the chip U1 pin 9 respectively of metal-oxide-semiconductor VT2, chip U1 pin 1 connects potentiometer R5 slide plate, potentiometer R5 one end ground connection, potentiometer R5 other end contact resistance R4, the resistance R4 other end connects output VO respectively, ground capacity C3 and inductance L 1, inductance L 1 other end connects diode D1 negative pole and diode D2 negative pole respectively, diode D1 positive pole connects diode D4 negative pole and transformer T secondary coil one end respectively, the transformer T secondary coil other end connects diode D2 positive pole and diode D3 negative pole respectively, diode D3 cathode connecting diode D4 positive pole ground connection, described chip U1 model is TL494.

Diode VD3 is voltage stabilizing didoe.

Making power supply VCC voltage is 12V.

Operation principle of the present utility model is: refer to Fig. 1, and TL494 is as the control circuit of power supply, and except as except oscillation source, also undertake the task of adjustment and regulated output voltage, its frequency of oscillation determines primarily of outward element R1 and C1.The switching frequency of this power supply is 100kHz.VD1, VD2 are isolating diode, and operating voltage is 33V.T is for exporting push-pull transformer, and its primary coil centre cap connects with direct current 12V input power.Secondaryly connect output bridge rectifier.Output filter is made up of choke L1 and filter capacitor C3, can play good filter action to the alternating current of 100kHz.When output voltage raises or reduce, it feeds back to 1 pin of TL494 by sampling divider resistance R4, R5, R6, be converted into the driving power of pulse duration and output VO voltage inverse variation, 9,10 pin through TL494 are transferred to metal-oxide-semiconductor VT1, VT2 respectively, change its output pulse width, make output VO voltage keep stable.

To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.

In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.

Claims (3)

1. a MOS controls drive circuit, comprise chip U1, resistance R1, electric capacity C1, inductance L 1, transformer T, metal-oxide-semiconductor VT1 and metal-oxide-semiconductor VT2, it is characterized in that, described chip U1 pin 12 connects power supply VCC respectively, chip U1 pin 11, chip U1 pin 8 and the tap of transformer T primary coil, chip U1 pin 14 connects chip U1 pin 13 respectively, electric capacity C1 and resistance R10, the resistance R10 other end is contact resistance R9 respectively, electric capacity C4 and resistance R8, electric capacity C4 other end contact resistance R9 ground connection, the resistance R8 other end connects chip U1 pin 2 respectively, resistance R7 and electric capacity C2, the electric capacity C2 other end is the contact resistance R7 other end and chip U1 pin 3 respectively, chip U1 pin 7 ground connection, chip U1 pin 4 is contact resistance R1 and the electric capacity C1 other end respectively, the resistance R1 other end distinguishes contact resistance R11 and electric capacity C5 and ground connection, the electric capacity C5 other end connects chip U1 pin 5, the chip U1 pin 6 contact resistance R11 other end, the G pole of chip U1 pin 10 difference contact resistance R2 and metal-oxide-semiconductor VT1, the S pole contact resistance R2 other end respectively of metal-oxide-semiconductor VT1, diode VD3 positive pole, the S pole of metal-oxide-semiconductor VT2 and resistance R3 ground connection, the D pole of metal-oxide-semiconductor VT1 connects diode VD1 positive pole and transformer T primary coil one end respectively, diode VD1 negative pole connects diode VD3 negative pole and diode VD2 negative pole respectively, the D pole of the diode VD2 positive pole difference connection transformer T primary coil other end and metal-oxide-semiconductor VT2, the G pole contact resistance R3 other end and the chip U1 pin 9 respectively of metal-oxide-semiconductor VT2, chip U1 pin 1 connects potentiometer R5 slide plate, potentiometer R5 one end ground connection, potentiometer R5 other end contact resistance R4, the resistance R4 other end connects output VO respectively, ground capacity C3 and inductance L 1, inductance L 1 other end connects diode D1 negative pole and diode D2 negative pole respectively, diode D1 positive pole connects diode D4 negative pole and transformer T secondary coil one end respectively, the transformer T secondary coil other end connects diode D2 positive pole and diode D3 negative pole respectively, diode D3 cathode connecting diode D4 positive pole ground connection, described chip U1 model is TL494.

2. MOS according to claim 1 controls drive circuit, and it is characterized in that, described diode VD3 is voltage stabilizing didoe.

3. MOS according to claim 1 controls drive circuit, and it is characterized in that, described power supply VCC voltage is 12V.