CN2395449Y

CN2395449Y - AC power filter

Info

Publication number: CN2395449Y
Application number: CN 99241521
Authority: CN
Inventors: 王天荣
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-11-08
Filing date: 1999-11-08
Publication date: 2000-09-06
Anticipated expiration: 2009-11-08

Abstract

The utility model relates to an alternating current power filter, which comprises a casing and three filtering units connected in series, wherein, the first filtering unit is composed of capacitances C1, C2 and C3 connected between a live wire, a zero wire and a ground wire in parallel; the second filtering unit is composed of capacitances C4, C5 and C6 connected between the live wire, the zero wire and the ground wire in parallel and a set of diodes D1 and D2 and D3 and D4 connected in parallel in positive and negative directions; the third filtering unit is composed of capacitances C7, C8 and C9 connected between the live wire, the zero wire and the ground wire in parallel and a set of diodes D4 and D5 and D6 and D7 connected in parallel in positive and negative directions. The utility model has the advantages of simple and reliable structure, strong load bringing ability, no influence on transient power supply ability and good filtering effect. The utility model can be served as power supply device for various precise electric equipment, especially audio-video and hi-fi audio systems.

Description

A kind of AC power filter

The utility model relates to a kind of power filter device, particularly a kind of device that AC power is carried out filtering.

Development along with society, power consumption equipment is on the increase, noise jamming in the power supply is more and more many, work as the start and stop of motor, electric drill, hair dryer, electric saw, electric planer etc. causes the electrical network noise jamming, these serious interference influence the operate as normal of accurate power consumption equipment, and especially the audio visual effect influence to AV, Hi-Fi sound system is bigger.Disturb in order to eliminate power supply, people have designed inductance type power filter device and transistor filter at these problems, but inductance type power filter device and the equal defectiveness of transistor filter.The inductance type filter can influence the transient state power supply capacity because inductance is an inductive element, makes sound system LF-response variation.And transistor power filter device often need be taked some safeguard measures to transistor because overload capacity is poor, makes its circuit structure complicated, and cost of manufacture is bigger.

The purpose of this utility model is: provide a kind of simple and reliable for structure, carrying load ability is strong, and the power supply transmission is fast, can thoroughly eliminate the AC power filter of the noise jamming in the civil power.

The utility model is to realize like this; Its formation comprises housing, and the filter unit of three serial connections, and wherein first filter unit is attempted by the capacitor C 1 between live wire and ground wire by the capacitor C 3 that is attempted by between live wire and zero line, and the capacitor C 2 that is attempted by between zero line and ground wire constitutes; Second filter unit is by being serially connected in forward and reverse and the diode D1, the D2 that connect on the live wire, be serially connected in forward and reverse and the diode D3, the D4 that connect on the zero line, and be attempted by capacitor C 6 between live wire and zero line, be attempted by the capacitor C 4 between live wire and ground wire, the capacitor C 5 that is attempted by between zero line and ground wire constitutes; The 3rd filter unit is by forward and reverse on the output live wire that is serially connected in second filter unit and the diode D5, the D6 that connect, the diode D7, the D2 that are serially connected in output forward and reverse on the zero line and connect, and be attempted by capacitor C 9 between live wire and zero line, be attempted by the capacitor C 7 between live wire and ground wire, the capacitor C 8 that is attempted by between zero line and ground wire constitutes; The output live wire and the zero line of device also is connected to a discharge resistance R1.

In above-mentioned AC power filter, be connected to a power supply wiring detecting unit between the zero line of the 3rd filter unit output and ground wire, this unit by be attempted by forward is connected in series between zero line and ground wire resistance R 2 and LED and with LED oppositely and the diode D9 that connects constitute.

Compared with the prior art, the utility model utilizes the fireballing characteristics of the unidirectional conducting of crystal diode, it is combined with electric capacity, and adopt three utmost point filtering.Part common mode, the differential mode noise jamming of each grade in can the filtering civil power can be played the effect of power conditioner with the complete filtering of the noise jamming in the civil power by three utmost point filtering.AV, the tonequality of Hi-Fi sound system, image are well improved, then more obvious to the improvement of high end audio system.Have simple and reliable for structure, carrying load ability is strong, does not influence the characteristics of transient state power supply capacity, good wave filtering effect.The electric supply installation that can be used as various accurate power consumption equipments, particularly AV, Hi-Fi sound system uses.

Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail:

Accompanying drawing 1 is an electrical structure schematic diagram of the present utility model.

Embodiment: the utility model constitutes the filter unit that comprises housing and three serial connections, and wherein first filter unit is attempted by the capacitor C 1 between live wire and ground wire by the capacitor C 3 that is attempted by between live wire and zero line, and the capacitor C 2 that is attempted by between zero line and ground wire constitutes; Second filter unit is by being serially connected in forward and reverse and the diode D1, the D2 that connect on the live wire, be serially connected in forward and reverse and the diode D3, the D4 that connect on the zero line, and be attempted by capacitor C 6 between live wire and zero line, be attempted by the capacitor C 4 between live wire and ground wire, the capacitor C 5 that is attempted by between zero line and ground wire constitutes; The 3rd filter unit is by forward and reverse on the output live wire that is serially connected in second filter unit and the diode D5, the D6 that connect, the diode D7, the D2 that are serially connected in output forward and reverse on the zero line and connect, and be attempted by capacitor C 9 between live wire and zero line, be attempted by the capacitor C 7 between live wire and ground wire, the capacitor C 8 that is attempted by between zero line and ground wire constitutes; The output live wire and the zero line of device also is connected to a discharge resistance R1.Between the zero line of the 3rd filter unit output and ground wire, be connected to a power supply wiring detecting unit, this unit by be attempted by forward is connected in series between zero line and ground wire resistance R 2 and LED and with LED oppositely and the diode D9 that connects constitute.

Operation principle of the present utility model is: when the positive half cycle of sinusoidal ac when live wire enters K switch, through first order C1, the noise jamming of a C3 filtering part, the second level filters partly noise jamming again through D1, C4, C6, D3.The third level exchanges remaining noise jamming in the positive half cycle through D5, C7, C9, D7 filtering.On civil power output loading RL, obtain pure positive half cycle alternating current, constitute the loop through D7, D3, K then.When being the negative half period alternating current on the live wire, it on the zero line positive half cycle alternating current, positive half cycle power supply obtains another pure half cycle alternating current through filtering such as K, C2, C3 and D4, C5, C6, D7 and D8, C8, C9, D6 on the zero line on RL, constitutes the loop through D6, D2, K then.R1 is a discharge resistance in the circuit.When wall outlet did not have earth connection, positive half cycle alternating current was by R2 and the LED and the live wire formation loop of power supply wiring detecting unit on the zero line, and LED is lighted, and provides cue.If earth connection, it is zero that ground wire and zero is tied voltage difference, and LED does not work, and the wiring of expression wall outlet is correct.When wall plug live wire and zero line connect inverse time, the voltage on the zero line is higher than the voltage on the ground wire all the time, and LED is lighted, and also can provide cue.D9 is for the protection diode, in case luminous tube LED is reversed puncture.

Claims

1, a kind of AC power filter, comprise housing, it is characterized in that: also include the filter unit of three serial connections, wherein first filter unit is by the capacitor C 3 that is attempted by between live wire and zero line, be attempted by the capacitor C 1 between live wire and ground wire, the capacitor C 2 that is attempted by between zero line and ground wire constitutes; Second filter unit is by being serially connected in forward and reverse and the diode D1, the D2 that connect on the live wire, be serially connected in forward and reverse and the diode D3, the D4 that connect on the zero line, and be attempted by capacitor C 6 between live wire and zero line, be attempted by the capacitor C 4 between live wire and ground wire, the capacitor C 5 that is attempted by between zero line and ground wire constitutes; The 3rd filter unit is by forward and reverse on the output live wire that is serially connected in second filter unit and the diode D5, the D6 that connect, the diode D7, the D7 that are serially connected in output forward and reverse on the zero line and connect, and be attempted by capacitor C 9 between live wire and zero line, be attempted by the capacitor C 7 between live wire and ground wire, the capacitor C 8 that is attempted by between zero line and ground wire constitutes; The output live wire and the zero line of device also is connected to a discharge resistance R1.

2, a kind of AC power filter according to claim 1, it is characterized in that: be connected to a power supply wiring detecting unit between the zero line of the 3rd filter unit output and ground wire, this unit by be attempted by forward is connected in series between zero line and ground wire resistance R 2 and LED and with LED oppositely and the diode D9 that connects constitute.