CN105703367A

CN105703367A - Power supply circuit

Info

Publication number: CN105703367A
Application number: CN201610012629.7A
Authority: CN
Inventors: 不公告发明人
Original assignee: Nine City Network Technology (shenzhen) Co Ltd
Current assignee: Nine City Network Technology (shenzhen) Co Ltd
Priority date: 2011-12-21
Filing date: 2011-12-21
Publication date: 2016-06-22

Abstract

A power supply circuit comprises an input end used for connecting an AC, a first AC filtering circuit connected with the two ends of the input end, a second AC filtering circuit connected with the first AC filtering circuit, a bridge rectifier circuit connected with the second AC filtering circuit, a DC filtering circuit connected with the bridge rectifier circuit, a double-pole-double-throw switch and an output end connected with the double-pole-double-throw switch. The DC filtering circuit is connected with a first set of pins of the switch, and the two ends of the input end are connected with a second set of pins of the double-pole-double-throw switch. When the double-pole-double-throw switch is connected with the first set of pins, the output end outputs a DC, and when the double-pole-double-throw switch is connected with the second set of pins, the output end outputs the AC.

Description

Power circuit

Technical field

The present invention relates to a kind of power circuit。

Background technology

Power supply test usually needs test DC voltage value and ac voltage, during test unidirectional current, sometimes need that test DC voltage value is descending becomes big process again, existing test uses a kind of direct current transducer, during test alternating current, need again to remove joint from transducer to be inserted into AC outlet again, relatively time-consuming。

Summary of the invention

In view of the foregoing, it is necessary to a kind of switchable power circuit of alterating and direct current is provided。

A kind of power circuit, it is characterized in that: described power circuit includes one for connecting the input of alternating current, first ac filter circuit at one two ends connecting described input, one the second ac filter circuit connecting described first ac filter circuit, one bridge rectifier connecting described second ac filter circuit, the one DC filtering circuit connecting described bridge rectifier, one electric discharge road, double-pole double-throw switch and one connects the outfan of described double-point double-throw switch, described discharge circuit includes multiple resistance being connected to described DC filtering circuit two ends, the plurality of resistance respectively multiple groups, connect between group and group, least one set is two resistant series, described DC filtering circuit connects one first group of pin of described double-point double-throw switch, the two ends of described input connect one second group of pin of described double-point double-throw switch, described double-point double-throw switch is when connecting described first group of pin, described outfan output unidirectional current, described double-point double-throw switch connects described outfan output AC electricity during described second group of pin, described second ac filter circuit includes one first electric capacity, two the second electric capacity, two resistance and an inductance, first end of said two the second electric capacity connects the two ends of described first electric capacity respectively, the second equal ground connection of end of said two the second electric capacity, said two resistant series is connected to the two ends of described first electric capacity, described inductance connection is between described first electric capacity and described bridge rectifier。

Compared with prior art, described switch connects first group of pin or second group of pin and makes described outfan output AC electricity or unidirectional current the power circuit of the present invention, simple and convenient。

Accompanying drawing explanation

Fig. 1 is the connection diagram of present pre-ferred embodiments power circuit。

Fig. 2 is the circuit connection diagram of present pre-ferred embodiments power circuit。

Main element symbol description

Input	100
		First ac filter circuit	10
Primary nodal point	101
		Secondary nodal point	103
Second ac filter circuit	20
		Outfan	200
3rd node	201
		Fourth node	203
Bridge rectifier	30
		DC filtering circuit	40
Discharge circuit	50
		Switch	60

Following detailed description of the invention will further illustrate the present invention in conjunction with above-mentioned accompanying drawing。

Detailed description of the invention

Refer to Fig. 1 and Fig. 2, present pre-ferred embodiments power circuit includes the input 100 of a connection alternating current, one the first ac filter circuit 10 connecting described input 100, one the second ac filter circuit 20 connecting described first ac filter circuit 10, one bridge rectifier 30 connecting described second ac filter circuit 20, the one DC filtering circuit 40 connecting described bridge rectifier 30, one discharge circuit 50 connecting described DC filtering circuit 40, the outfan 200 of one double-point double-throw switch 60 connecting described discharge circuit 50 and a described double-point double-throw switch 60 of connection。The two ends of described input 100 connect primary nodal point 101 and a secondary nodal point 103 respectively。Described primary nodal point 101 and secondary nodal point 103 connect first group of pin of described double-point double-throw switch 60。

Described first ac filter circuit 10 includes an electric capacity C1, a diode D1 and a common mode inductance L1。The two ends of described electric capacity C1, described common mode inductance L1 and described diode D1 are connected between described primary nodal point 101 and described secondary nodal point 103, the negative pole of wherein said diode D1 connects described primary nodal point 101, the positive pole of described diode D1 connects described secondary nodal point, and the other two ends of described common mode inductance L1 connect one the 3rd node 201 and a fourth node 203 respectively。In the present embodiment, the value of described electric capacity C1 is 470nF。In another embodiment, described common mode inductance L1 can be general electric capacity。

Described second ac filter circuit 20 includes an electric capacity C2, two electric capacity C3, common mode inductance L2 and two resistance R1。The two ends of described electric capacity C2 and described common mode inductance L2 are connected between described 3rd node 201 and described fourth node 203。Wherein one end of an electric capacity U3 connects described 3rd node 201, its other end ground connection。One end of another electric capacity U3 connects described fourth node 203, its other end ground connection。Said two resistance R1 connects and is connected between described 3rd node 201 and described fourth node 203。The other two ends of described common mode inductance L2 connect described bridge rectifier 30。In the present embodiment, the value of described electric capacity C2 is 470nF, and the value of described electric capacity C3 is 3.3nF, and the resistance of described resistance R1 is 332K Ω。In another embodiment, described common mode inductance L2 can be general electric capacity。

Described bridge rectifier 30 is made up of four diodes, and two inputs of described bridge rectifier 30 connect described common mode inductance L2。Two outfans (positive output end and negative output terminal) of described bridge rectifier 30 connect described DC filtering circuit 40。Described DC filtering circuit 40 includes the electric capacity C4 between two outfans being connected to described bridge rectifier 30。In the present embodiment, the value of described electric capacity C4 is 120 μ F。

Described discharge circuit 50 includes nine resistance R2, and 9 resistance R2 are divided into three groups, often group three, and three the resistance R2 often organized are connected in parallel, and the resistance R2 of three groups is connected in series in the two ends of described electric capacity C4 again。Described discharge circuit 50 connects second group of pin of described double-point double-throw switch 60。In the present embodiment, the resistance value of described resistance R2 is 10K Ω。In another embodiment, described 9 resistance R2 can replace with a resistance。

When described input 100 input AC electricity, exchange after the filtering of described first ac filter circuit 10 and described second ac filter circuit 20 then through the conversion by described bridge rectifier 30 after become unidirectional current, after the unidirectional current filtering via described DC filtering circuit 40, when described double-point double-throw switch 60 connects second group of pin, then DC power transmission extremely described outfan 200。When described double-point double-throw switch 60 connects first group of pin, then alternating current transmission extremely described outfan 200。Thus facilitating test man to carry out alternating current or galvanic test for described outfan 200。

After the dump of described input 100, described DC filtering circuit 40 can be discharged by described discharge circuit 50。

In one embodiment, it is connected an electric fuse between described second ac filter circuit 20 and described bridge rectifier 30。

It will be apparent to those skilled in the art that can make other changes accordingly according to the scheme of the invention of the present invention and being actually needed of inventive concept combination production or adjust, and these changes and adjustment all should belong to the protection domain of the claims in the present invention。

Claims

1. a power circuit, it is characterized in that: described power circuit includes one for connecting the input of alternating current, first ac filter circuit at one two ends connecting described input, one the second ac filter circuit connecting described first ac filter circuit, one bridge rectifier connecting described second ac filter circuit, the one DC filtering circuit connecting described bridge rectifier, one electric discharge road, double-pole double-throw switch and one connects the outfan of described double-point double-throw switch, described discharge circuit includes multiple resistance being connected to described DC filtering circuit two ends, the plurality of resistance respectively multiple groups, connect between group and group, least one set is two resistant series, described DC filtering circuit connects one first group of pin of described double-point double-throw switch, the two ends of described input connect one second group of pin of described double-point double-throw switch, described double-point double-throw switch is when connecting described first group of pin, described outfan output unidirectional current, described double-point double-throw switch connects described outfan output AC electricity during described second group of pin, described second ac filter circuit includes one first electric capacity, two the second electric capacity, two resistance and an inductance, first end of said two the second electric capacity connects the two ends of described first electric capacity respectively, the second equal ground connection of end of said two the second electric capacity, said two resistant series is connected to the two ends of described first electric capacity, described inductance connection is between described first electric capacity and described bridge rectifier。

2. power circuit as claimed in claim 1, it is characterised in that: it is connected an electric fuse between described second ac filter circuit and described bridge rectifier。