CN2279647Y

CN2279647Y - Notebook type computer power supply device

Info

Publication number: CN2279647Y
Application number: CN 96244576
Authority: CN
Inventors: 陈铭智
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-12-09
Filing date: 1996-12-09
Publication date: 1998-04-22
Anticipated expiration: 2006-12-09

Abstract

The utility model relates to a notebook type computer power supply device. A power supply arranged in a notebook type computer main cabinet is composed of an input rectifier, a U-shaped filter, an inverter, an output rectifying circuit and an output protection circuit. The input rectifier, the U-shaped filter, the inverter, the output rectifying circuit and the output protection circuit are connected in series orderly, wherein, the output end of the output protection circuit is connected with the control end of a switch oscillating tube arranged in the inverter, and the grid electrode of the switch oscillating tube arranged in the inverter slant arranged on both ends of a resistor is connected in parallel with an accelerating circuit composed of an accelerating resistor and an accelerating condenser connected in series. The n-shaped filter is arranged on a DC side after the input rectifier. Heat generation and electrical leakage of the utility model are reduced, and the effect of volume reduction is achieved. Moreover, the accelerating circuit shortens switching delay time of the switch oscillating tube to reduce the power consumption and heat generation of the switch oscillating tube. The power supply device and a computer main board can be unified and arranged in the computer main cabinet through measures above.

Description

The notebook computer power supply unit

The utility model relates to a kind of interior power supply unit of cabinet that is contained in notebook computer.

Portable computer has patterns such as on knee, notes type, hand held now, and its power supply unit is circumscribed.This circumscribed power supply unit is connected in series successively by pi type filter, input rectifier, inverter, output rectification circuit, output protection circuit and forms, and its pi type filter is made of noise filter and filter capacitor.After it converts civil power to direct current, deliver to the supply hub of notebook computer cabinet through cable, the electric power source distribution device in cabinet again, one tunnel supply computer motherboard, another road through charging circuit to the battery charge in the cabinet.Like this, when carrying notebook computer and going out, also need carry power supply unit simultaneously, quite take up room, and this design that is divided into two independent case, omit power supply unit because of carelessness most probably, so very feel inconvenience in the use.

As power supply unit and computer are integrated, above problem just can solve, but there are two problems in this circumscribed power supply unit: 1. noise filter is connected on AC side, what flow through on it is the alternating current of big electric current, the temperature that its iron core produces is quite high, so need bigger iron core could satisfy the heat radiation requirement, but the volume of wave filter can't dwindle like this, therefore also it can't be contained in the computer housing, also has the problem of generating heat and influencing main frame stable operation in addition, and electric leakage that filter capacitor produces and heating phenomenon also may influence main frame and normally move.2. the switching delay of the switch oscillating tube in the inverter is bigger, can produce suitable heat.Therefore do not solve above-mentioned take up room, leak electricity, problem such as heating, just power supply unit and computer can not be integrated.

In view of above-mentioned, the utility model will provide a kind of little, leakproof of taking up room, can reduce the power supply unit of thermal value, and this power supply unit can be integrated with the motherboard of computer.

For reaching this purpose, the utility model is by the following technical solutions: the notebook computer power supply unit, comprise pi type filter, input rectifier, inverter, output rectification circuit, output protection circuit, inverter, output rectification circuit, output protection circuit are connected in series successively, the output of output protection circuit connects the control end of switch oscillating tube in the inverter, it is characterized in that: described pi type filter is serially connected between the input of the output of described input rectifier and described inverter; The gate bias resistor two ends of a switch oscillating tube accelerating circuit that constitutes by accelerating resistor and speed-up capacitor series connection in parallel in the described inverter.

The utility model is arranged on input rectifier DC side afterwards with pi type filter, heating and electric leakage have been reduced, so can reach the effect of reduced volume, and accelerating circuit has shortened the switching delay time of switch oscillating tube, so can reduce the power consumption and the heating of switching tube.Above measure can be integrated power supply unit and computer motherboard.

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is the circuit diagram of circumscribed power supply unit;

Fig. 2 is a circuit diagram of the present utility model.

Circumscribed power supply unit among Fig. 1 is connected in series successively and is formed by pi type filter, input rectifier BD, inverter, output rectification circuit, output protection circuit, and the output of output protection circuit connects the control end of switch oscillating tube in the inverter.Wherein: pi type filter is made of noise filter NF3 and filter capacitor CY11, CY21; Inverter is made of Q11, Q21, Q31 and peripheral circuit thereof, Q11 is the switch oscillating tube of inverter, its output connects the former limit (among the figure with thick black line indication transformer and former secondary thereof) of transformer, and Q31 that is in series and Q21 constitute the controlled stage of switch oscillating tube Q11; The half-wave rectification filtering circuit that the output rectification circuit that picks out from the secondary of transformer is made up of commutation diode D51, filter inductance L1, filter capacitor C121 etc., its output+12V direct current; Output protection circuit is made of comparer U2A1 and U2B1, optocoupler pipe U11 and peripheral circuit.When output overloading, the luminotron of U11 is lighted, and the light-receiving tube of the U11 by the being connected on switch controlled level Q31 base stage ON time of coming gauge tap pipe Q11, thereby regulates output voltage automatically.The defective front of this circuit is narrated.

See also accompanying drawing 2, the utility model is connected in series successively by input rectifier BD1, pi type filter, inverter, output rectification circuit, output protection circuit and forms, and the output of output protection circuit connects the control end of inverter.Wherein: pi type filter is made of noise filter NF and filter capacitor C1, C7, C45; Q1～the Q3 and the peripheral circuit thereof that are arranged in the figure lower left quarter constitute inverter, and Q3 is the switch oscillating tube in the inverter, and its output connects the former limit of transformer T1, and Q1 and Q2 constitute the controlled stage of switch oscillating tube Q3; The half-wave rectifying circuit that the output rectification circuit that picks out from the secondary of transformer T1 is made up of commutation diode D3, filter inductance L1, filter capacitor C11～C13 etc., its exportable+18V direct current; The output protection circuit that is arranged in the figure right lower quadrant is made of two LM358 comparers, optocoupler pipe PC1 and peripheral circuit.When output overloading, the luminotron of PC1 is lighted, and the light-receiving tube of the PC1 by the being connected on switch controlled level Q1 base stage ON time of coming gauge tap pipe Q3, thereby regulates output voltage automatically.This circuit is integrated with the motherboard of notebook computer, is contained in the computer host box.

Each element circuit is similar substantially to Fig. 1 in the utility model, and difference has 2 points: 1. pi type filter is arranged on after the input rectifier BD1; The gate bias resistor R2 two ends of a switch oscillating tube Q3 accelerating circuit that constitutes by accelerating resistor R80 and speed-up capacitor C60 series connection in parallel in 2 inverters, wherein, the about 1K Ω of the resistance of R2, about 100 Ω of the resistance of R80, the about 0.1 μ F of the capacity of C60.

Because noise filter NF is located at the DC side after the input rectifier, only flow through the noise in direct current and the direct current on it, there is not to be positioned in the circumscribed power supply unit the big current problems of AC side, the heat of its generation is lower, available less iron core constitutes, so can reach the effect of reduced volume, and can guarantee the effect of identical filtering noise.And the filter capacitor C1, the C7 that link to each other with noise filter, C45 also are positioned on the direct supply end points because of it, its electric capacity electrical leakage quantity on direct supply is extremely low, so can solve caused electric leakage and the heating problem that leaks electricity and derive when being positioned at AC side in the circumscribed power supply unit, more can guarantee its stability and serviceable life.

After setting up accelerating circuit, when switching tube Q3 by when transferring conducting to, direct current provides bias current and charges to C60 to the grid of Q3 through speed-up capacitor C60 and accelerating resistor R80, because the impedance of accelerating circuit is much smaller than the resistance of biasing resistor R2, so the rapid conducting of Q3, its service time shortens greatly.After speed-up capacitor C60 was full of electricity, this accelerating circuit opened circuit, and changeed immediately by former biasing resistor R2 this moment and supplied with lower grid bias, so switching tube Q3 transfers cut-off state to by conducting, because the R2 resistance is bigger, so Q3 ends rapidly, its turn-off time also shortens greatly.Because the switching delay time of switching tube has shortened, so can reduce the power consumption and the heating of switching tube.

Because the volume of pi type filter reduces, thermal value reduces and do not have leaky, accelerating circuit has reduced the power consumption and the thermal value of switching tube again, so the utility model can be integrated with the motherboard of notebook computer, is contained in the computer host box.

Claims

1. notebook computer power supply unit; comprise pi type filter, input rectifier, inverter, output rectification circuit, output protection circuit; inverter, output rectification circuit, output protection circuit are connected in series successively; the output of output protection circuit connects the control end of switch oscillating tube in the inverter, it is characterized in that:

Described pi type filter is serially connected between the input of the output of described input rectifier and described inverter;

The gate bias resistor two ends of a switch oscillating tube accelerating circuit that constitutes by accelerating resistor and speed-up capacitor series connection in parallel in the described inverter.

2. notebook computer power supply unit as claimed in claim 1 is characterized in that: the resistance of described accelerating resistor is 100 Ω.

3. notebook computer power supply unit as claimed in claim 1 is characterized in that: the capacity of described speed-up capacitor is 0.1 μ F.