CN2689562Y

CN2689562Y - PFC circuit with harmonic inhibiting function

Info

Publication number: CN2689562Y
Application number: CNU2004200147169U
Authority: CN
Inventors: 王斌
Original assignee: Guangdong Kelong Electrical Appliances Co Ltd
Current assignee: Guangdong Kelong Electrical Appliances Co Ltd
Priority date: 2004-01-08
Filing date: 2004-01-08
Publication date: 2005-03-30
Anticipated expiration: 2014-01-08

Abstract

The utility model provides a PFC circuit with harmonic inhibiting function which can be connected on the output terminal of the rectifier circuit (A101) and which comprises a transformer T101, a capacitor C101, and a diode V101. Wherein, the primary L1 and the secondary L2 of the transformer T101 are respectively a simplex winding coil, and the lead wires of the L1 and the L2 are respectively end to end; the lead wire of the L1 is marked as A, B1, and the leading wire of the L2 is marked as B2, C; the A terminal of the L1 and the B2 terminal of the L2 are isonym terminals; the B1 terminal of the transformer T101 is connected with one terminal of the capacitor C101, and the other terminal of the capacitor C101 is connected with the negative output of the rectifier circuit A101; the positive and negative poles of the diode V101 and the B2 terminal and the, C terminal of the secondary L2 of the transformer T101 are connected in series between the B1 terminal of the primary L1 of the transformer T101 and the output terminal of the circuit. The power factor correction (PFC) circuit can effectively improve the power factor and inhibit the harmonic current, can be extensively applied for the products, such as a frequency conversion air conditioner, a frequency conversion laundry machine, a frequency conversion refrigerator, a microwave oven, an energy-saving lamp, etc., and accordingly, the damage caused by the frequency conversion domestic appliance for the electric network is maximally decreased.

Description

A kind of pfc circuit that has harmonic restraining function concurrently

Technical field

The utility model relates to power to be proofreaied and correct and harmonic wave inhibition technology, more particularly, relates to a kind of passive power factor correcting circuit that is mainly used in the products such as transducer air conditioning, variable-frequency washing machine, frequency conversion refrigerator, microwave oven, electricity-saving lamp.

Background technology

The power factor of products such as transducer air conditioning, variable-frequency washing machine, frequency conversion refrigerator, microwave oven, electricity-saving lamp is lower and harmonic current is bigger, along with popularizing of these products, harmonic current is day by day serious to the infringement of electrical network, for effectively containing the negative interaction of harmonic current, improve electrical network efficient, need control the amplitude of harmonic current effectively, improve power factor.

The utility model content

The technical problems to be solved in the utility model provides a kind of pfc circuit that has harmonic restraining function concurrently, and this circuit can improve power factor effectively, constrains the generation of harmonic current simultaneously, reduces the infringement of electric equipment products to electrical network.

The above-mentioned technical problem of the utility model solves like this, construct a kind of novel pfc circuit that has harmonic restraining function concurrently, rectification circuit A101 output be can be connected on, transformer T101, capacitor C101 comprised, diode V101, wherein, elementary L1 and the secondary L2 of described transformer T101 are respectively the simplex winding coil, and the lead-in wire of L1 and L2 joins end to end, and the L1 lead-in wire is designated as A, B1, the L2 lead-in wire is designated as B2, C, and the A end of L1 and the B2 end of L2 are end of the same name; The B1 end of described transformer T101 is connected with the end of capacitor C101, the other end of described capacitor C101 is connected with the negative output of rectification circuit A101, and the B2 end of the secondary L2 of described diode V101 positive and negative electrode, described transformer T101, C end are connected in series between the B1 end and circuit output end of L1.

In the above-mentioned pfc circuit that has harmonic restraining function concurrently, also comprise being connected the filter circuit of forming by filter capacitor C102 between circuit output end and the ground.

In the above-mentioned pfc circuit that has harmonic restraining function concurrently, described B1 and B2 are merged into an end B and meet described capacitor C101, and described diode V101 positive pole connects C end, the negative pole connection circuit output of described diode V101.

In the above-mentioned pfc circuit that has harmonic restraining function concurrently, can also connect described B1 to described diode V101 positive pole, the negative pole of described diode V101 meets B2, the output of the C termination circuit of described L2.

Implement the pfc circuit that has harmonic restraining function concurrently of the present utility model, can be applicable in the products such as transducer air conditioning, variable-frequency washing machine, frequency conversion refrigerator, microwave oven and electricity-saving lamp, effectively suppress the generation of harmonic current, improve power factor, thereby reduce the infringement of electric equipment products to greatest extent electrical network.

Description of drawings

Fig. 1 is the circuit theory diagrams that the utility model has pfc circuit first embodiment of harmonic restraining function concurrently;

Fig. 2 is the circuit theory diagrams that the utility model has pfc circuit second embodiment of harmonic restraining function concurrently.

Embodiment

A specific embodiment of the present utility model as shown in Figure 1, this pfc circuit uses transformer T101, its primary and secondary is respectively the coil of simplex winding, be designated as L1 and L2 respectively, the lead terminal of L1 and L2 joins end to end, two lead-in wires of L1 are designated as A, B1 respectively, and two lead-in wires of L2 are designated as B2, C respectively, and the A end of L1 and the B2 end of L2 are end of the same name; The A end of the positive output of rectification circuit A101 and the elementary L1 of transformer links to each other, the B end that B1, B2 are merged into is connected with an end of capacitor C 101, the other end of capacitor C 101 is connected with the negative output of rectification circuit A101, the C end of transformer is connected with the anode of diode V101, the end of the negative electrode of diode V101 and filter capacitor C102 is connected, and the other end of filter capacitor C102 is connected with the negative output of rectification circuit A101.

When power-frequency voltage makes rectification circuit A101 have electric current to flow through because of phase change, electric current at first flows through two winding L 1 and the L2 of transformer, effectively constrained maximum charging current to capacitor C 102, simultaneously because the afterflow effect of inductance, make behind the angle of flow of electric current to being able to broadening, because in the afterflow stage, the voltage of transformer T101 is that the C end is higher than the B end that B1, B2 merge, the B end is higher than the A end, thereby makes the voltage of capacitor C 101 descend; When next conducting begins, because the voltage of capacitor C 101 is lower, make rectification circuit shift to an earlier date conducting, the angle of flow forward direction of electric current is able to broadening; Thereby effectively expanded effective angle of flow of electric current, and improved the waveform of electric current effectively, reduced the generation of harmonic wave, improved power factor, constrained harmonic current simultaneously effectively.

In the such scheme, if B1, B2 are not merged into the B end, then the utility model also has the another kind of connection that changes, as shown in Figure 2, this second embodiment specific practice is: diode V101 is serially connected with between B1, the B2 end of transformer, the B1 end of capacitor C 101 and transformer is connected, and an end of capacitor C 102 and the C of transformer end are connected.Its operation principle is the same.

Claims

1, a kind of pfc circuit that has harmonic restraining function concurrently, can be connected rectification circuit (A101) output, it is characterized in that, comprise transformer T101, capacitor C101, diode V101, wherein, elementary L1 and the secondary L2 of described transformer T101 are respectively the simplex winding coil, and the lead-in wire of L1 and L2 joins end to end, and the L1 lead-in wire is designated as A, B1, the L2 lead-in wire is designated as B2, C, and the A end of L1 and the B2 end of L2 are end of the same name; The B1 end of described transformer T101 is connected with the end of capacitor C101, the other end of described capacitor C101 is connected with the negative output of rectification circuit A101, between the B1 end and circuit output end of the elementary L1 that the B2 end of the positive pole of described diode V101, negative pole, T101 level of described transformer L2, C end are connected in series in described transformer T101.

2, according to the described pfc circuit that has harmonic restraining function concurrently of claim 1, it is characterized in that, also comprise being connected the filter circuit of forming by filter capacitor C102 between circuit output end and the ground.

3, according to claim 1 or the 2 described pfc circuits that have harmonic restraining function concurrently, it is characterized in that described B1 and B2 are merged into an end B and meet described capacitor C101, described diode V101 positive pole meets C, the negative pole connection circuit output of diode V101.

According to claim 1 or the 2 described pfc circuits that have harmonic restraining function concurrently, it is characterized in that 4, can also connect described B1 to described diode V101 positive pole, the negative pole of described diode V101 meets B2, the C termination circuit output of described L2.

According to the described pfc circuit that has harmonic restraining function concurrently of claim 3, it is characterized in that 5, the positive output of rectification circuit (A101) is connected with the A of transformer T101 end.

According to the described pfc circuit that has harmonic restraining function concurrently of claim 4, it is characterized in that 6, the positive output of rectification circuit (A101) is connected with the A of transformer T101 end.