CN2514545Y

CN2514545Y - Interchangeable power supply device

Info

Publication number: CN2514545Y
Application number: CN 01204540
Authority: CN
Inventors: 林训毅
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-02-28
Filing date: 2001-02-28
Publication date: 2002-10-02
Anticipated expiration: 2011-02-28

Abstract

A switched power supplier comprises a power supplying circuit, an input rectification and filter circuit, an SCR excitation circuit, a DC-DC converter and a feedback control circuit. The drive process is input via a single-phase alternating-current power supply, prevents the influences of electromagnetic interference (EMI) via a filter, and then the drive process is respectively sent to the power supplying circuit and the rectification and filter circuit via the SCR excitation circuit to generate DC voltage and forms a closed-loop feedback system. The utility model has high efficiency, non-heating property, small size, light weight, and wide current input range, which can realize the input of direct current.

Description

Switched power supplier

The utility model relates to electric equipment, relates in particular to a kind of switched power supplier.

The linear formula power supply unit of commonly using, though have advantage of simple structure, still there are many shortcomings in it, demands urgently improving.1, its service efficiency low (its power component is often all at " ON " state, so its delivery efficiency only has about 30% to 50% approximately).2, it must use transformer, therefore can't be installed on the printed circuit board (PCB), can not realize the miniaturization requirement.3, its input range is less, and can not carry out galvanic input.4, also have heating easily, volume is big and benzene heavily waits shortcoming.

In view of this, creator of the present utility model carries out positive research and development, designs the utility model finally.

The purpose of this utility model is to provide a kind of switched power supplier, make have the efficient height, volume is little, in light weight, the power supply input range is big and can carry out effect such as direct current input.

The purpose of this utility model is realized by following technical scheme.

A kind of switched power supplier, it is characterized in that, comprise power supply circuit, the input rectifying filter circuit, the SCR circuits for triggering, DC-DC transducer and feedback control circuit, described power supply circuit output is connected with input rectifying filter circuit input, described SCR circuits for triggering output then links to each other with input rectifying filter circuit input, this input rectifying filter circuit output is connected with described DC-DC transducer input, forms the switched power supplier output DC power supply of loop circuit back coupling system to load by this DC-DC transducer and feedback control circuit.

Above-mentioned purpose of the present utility model can also further realize by following technical measures.

Aforementioned switched power supplier, wherein the DC-DC transducer is made of a power switch circuit, a high-frequency isolation transformer, output rectifier and filter, wherein power switch circuit is connected with described output rectifier and filter through high-frequency isolation transformer, this output rectifier and filter output termination load.

Aforementioned switched power supplier, wherein feedback control circuit is made of with compensating circuit PWM drive circuit, pulse transformer, error amplification, and wherein the error amplification is connected with described PWM drive circuit through the pulse transformer with compensating circuit.

Concrete structure of the present utility model is provided in detail by following examples and accompanying drawing thereof.

Fig. 1 is the utility model circuit block diagram.

Fig. 2 is the utility model power supply circuit schematic diagram.

Fig. 3 is the utility model input rectifying filter circuit schematic diagram.

Fig. 4 is the utility model SCR circuits for triggering schematic diagrames.

Fig. 5 is the utility model DC-DC converter circuit schematic diagram.

Consult shown in Figure 1, the utility model switched power supplier, its manner of execution is to be imported by single phase alternating current power supply, influence to prevent electromagnetic interference (EMI) via first filter then, provide respectively more afterwards and input to power supply circuit 10 (as shown in Figure 2) and input rectifying filter circuit 20 (as shown in Figure 3), and utilize SCR circuits for triggering 30 (as shown in Figure 4) to cooperate input rectifying filter circuit 20 to produce dc voltage, form loop circuit back coupling system via DC-DC transducer 40 (as shown in Figure 5) and feedback control circuit 50 (as shown in Figure 1) again, reach output dc voltage and give load.

It comprises a power switch circuit 41 above-mentioned DC-DC transducer 40 (consulting shown in Figure 5), one high-frequency isolation transformer 42 and an output rectifier and filter 43, above-mentioned driving flow process is the input driving that is subjected to input rectifying filter circuit 20 because of power switch circuit 41, and trigger driving input rectifying filter circuit 20 by SCR circuits for triggering 30, therefore, on driving, use has the high advantage of efficient (because of part-time just conducting during pulse wave, efficient can reach greater than more than 60%), and high-frequency isolation transformer 42 can make through the output of output rectifier and filter 43 Signal Spacing more stable.

Above-mentioned feedback control circuit 50 (consulting shown in Figure 5), it comprises a PWM drive circuit 51, one pulse transformer 52 and an error are amplified compensating circuit 53, above-mentioned driving flow process is to utilize this PWM drive circuit 51 to obtain a burning voltage, supply with the power switch circuit 41 in the DC-DC transducer 40 then, this error amplification and compensating circuit 53 are because of having the dual-use function of enlargement ratio and phase compensation, so, it can be carried out respectively and decide voltage or decide Current Control and (can utilize voltage to feedback the principle that compares amplification with reference voltage (Vref), decide voltage control to reach; In like manner, also can utilize electric current back coupling and reference current (Vref) to compare the principle of amplification, decide Current Control) to reach.

As shown in the above description, switched power supplier of the present utility model, it has the high advantage of efficient, and input voltage range can be commonly used product big (covering scope is about the AC input between 100V～240V), also can do the direct current input, moreover, because of adopting Electronic Control, so volume is little, in light weight, has the practical advantage (because of its part lightly can be contained on the printed circuit board (PCB)) of miniaturization; Compare with commonly using product, effectively improve the shortcoming of commonly using linear formula power supply unit, low as efficient, volume big and heavy, shortcoming such as input voltage range is little, increases its effect, the result of use ideal reaches design purpose.

Claims

1, a kind of switched power supplier, it is characterized in that, comprise power supply circuit, the input rectifying filter circuit, the SCR circuits for triggering, DC-DC transducer and feedback control circuit, described power supply circuit output is connected with input rectifying filter circuit input, described SCR circuits for triggering output then links to each other with input rectifying filter circuit input, this input rectifying filter circuit output is connected with described DC-DC transducer input, forms the switched power supplier output DC power supply of loop circuit back coupling system to load by this DC-DC transducer and feedback control circuit.

2, according to the described switched power supplier of claim 1, it is characterized in that, described DC-DC transducer is made of a power switch circuit, a high-frequency isolation transformer, output rectifier and filter, wherein power switch circuit is connected with described output rectifier and filter through high-frequency isolation transformer, this output rectifier and filter output termination load.

3, according to the described switched power supplier of claim 1, it is characterized in that, described feedback control circuit is amplified by PWM drive circuit, pulse transformer, error and compensating circuit constitutes, and wherein the error amplification is connected with described PWM drive circuit through the pulse transformer with compensating circuit.