CN105590746A

CN105590746A - Winding and circuit structure integrated with main transformer and isolation signal transmitter

Info

Publication number: CN105590746A
Application number: CN201410578589.3A
Authority: CN
Inventors: 滕传超; 魏槐
Original assignee: JIANGSU ZHAONENG ELECTRONICS CO Ltd
Current assignee: JIANGSU ZHAONENG ELECTRONICS CO Ltd
Priority date: 2014-10-24
Filing date: 2014-10-24
Publication date: 2016-05-18

Abstract

The invention provides a winding and circuit structure which forms a main transformer and an isolation signal transmitter on a closed circuit magnetic core which is provided with two side columns and a center column. The structure is characterized in that the isolation signal transmitter is provided with two windings of a first winding and a second winding. The magnetic flux generated by the windings of the main transformer would not generate induction voltage in the first winding of the isolation signal transmitter, but would generate induction voltage in the second winding of the isolation signal transmitter. The invention provides the winding structure which uses a single magnetic core to form a plurality of magnetic elements. The method can effectively reduce product cost and volume of a switching power supply, and improve reliability.

Description

The winding of integrated main transformer and isolation signals conveyer and line construction

Technical field

The present invention relates to field of switch power, the transformer particularly using in Switching Power Supply and isolation signals conveyer.

Background technology

Switching Power Supply is because its small size and high efficiency are occupied of paramount importance status in modern power supply.

Isolation type switching power supply has a power transformer. This transformer has former limit and secondary winding, and common example as shown in Figure 1. Be positioned at the design of the insulating power supply on former limit for controller, the detection signal of secondary need to pass through special isolating device, as photoelectrical coupler, is sent to the controller on former limit. Such isolating device cost is high, volume is large, reliability is low. Needed is the isolation signals transfer approach that a kind of cost is low, volume is little, reliability is high.

Summary of the invention

Winding and line construction that technical problem to be solved by this invention is to provide a kind of integrated main transformer and isolation signals conveyer substitute traditional isolating device.

The present invention realizes above-mentioned purpose by following technical proposals:

The winding and the line construction that on the closed circuit magnetic core with two side columns and a center pillar, form a main transformer and an isolation signals conveyer, is characterized in that, isolation signals conveyer has the first and second two windings; The magnetic flux that the winding of main transformer produces can not produce induced voltage in the first winding of isolation signals conveyer, but can in the second winding of isolation signals conveyer, produce induced voltage.

Preferably, on above-mentioned a kind of closed circuit magnetic core with two side columns and a center pillar, form winding and the line construction of a main transformer and an isolation signals conveyer, it is characterized in that, the former limit of above-mentioned main transformer and secondary winding are all on the center pillar of magnetic core; The first winding of isolation signals conveyer around on a side column in the direction of the clock around certain number of turns, then continue on another side column counter clockwise around the same number of turns; The sectional area of two side columns of above-mentioned magnetic core is identical; The second winding of isolation signals conveyer is on any one side column; The external current limiter of the second winding and a tandem tap of isolation signals conveyer.

Brief description of the drawings

Fig. 1 is the transformer with former limit winding and secondary winding of commonly using.

Fig. 2 is the example that adopts integrated transformer of the present invention and signal transmitter and one.

Detailed description of the invention

Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to describe technical scheme of the present invention in detail.

The invention provides the winding and the line construction that on a kind of closed circuit magnetic core thering is two side columns and a center pillar, form a main transformer and an isolation signals conveyer.

Shown in Fig. 2 is to adopt to have the closed circuit magnetic core formation main transformer of two side columns and a center pillar and winding and the line construction of an isolation signals conveyer. Main transformer T1 is by the former limit winding T1 being wound on newel_{_ former limit}With secondary winding T1_{_ secondary}Form. Isolation signals conveyer T2 is by the former limit winding T2 being wound on two side columns_{_ former limit}With secondary winding T2_{_ secondary}Form. The former and deputy limit winding of T1 is traditional winding. The former limit winding of T2 is held initial from "+", along clockwise direction on the left side post around definite number of turns (being two circles in Fig. 2 example), then continue on the right on post counterclockwise around the same number of turns. The magnetic flux being produced by the winding on the post of the left side in the time of normal work is identical with the magnetic flux amplitude of winding generation on the post of the right, but therefore opposite direction in center pillar can not produce induced voltage in the winding of main transformer T1. The magnetic flux being produced in center pillar by the former secondary winding of main transformer, the closed-loop path forming because being assigned to equably two side columns also can not produce induced voltage in T2 winding. In the time that secondary has the signal that need to be sent to former limit, the switch S of secondary circuit closure and T2 secondary windings in series, by T2__SecondaryThe magnetic flux that induced-current in the loop that winding, current-limiting resistance R and switch S form produces destroys the equilibrium of magnetic flux in original two side columns, makes to occur induced voltage in loop, the former limit of T2_. This voltage has represented that secondary need to be sent to the signal on former limit. Such signal transmission can be for the guard signal of secondary fault, or any secondary need to send to the status signal on former limit. From practical angle, generally can on three legs of magnetic core, add some air gaps, to ensure that magnetic flux is uniformly distributed according to the form of design preferably. If for the electric source topology of flyback class, the magnetizing inductance of transformer needs stored energy, and so larger air gap will be necessary.

Although forming winding construction and the circuit of main transformer and an isolation signals conveyer on the above-mentioned magnetic core having two side columns and a center pillar is that its principle is applicable equally to multiple core structure to the narration by E shape+I shape combined magnet core. Above-mentioned current-limiting resistance R can be also the distributed resistance of circuit or the internal resistance of switch S.

Although more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, do not deviating under the prerequisite of principle of the present invention and essence, can make various changes or modifications to these embodiments. Therefore, protection scope of the present invention is limited by appended claims.

Claims

1. the winding and the line construction that on the closed circuit magnetic core with two side columns and a center pillar, form a main transformer and an isolation signals conveyer, is characterized in that, isolation signals conveyer has the first and second two windings; The magnetic flux that the winding of main transformer produces can not produce induced voltage in the first winding of isolation signals conveyer, but can in the second winding of isolation signals conveyer, produce induced voltage.

2. on a kind of closed circuit magnetic core thering is two side columns and a center pillar as claimed in claim 1, form winding and the line construction of a main transformer and an isolation signals conveyer, it is characterized in that, the former limit of above-mentioned main transformer and secondary winding are all on the center pillar of magnetic core; The first winding of isolation signals conveyer around on a side column in the direction of the clock around certain number of turns, then continue on another side column counter clockwise around the same number of turns; The sectional area of two side columns of above-mentioned magnetic core is identical; The second winding of isolation signals conveyer is on any one side column; The external current limiter of the second winding and a tandem tap of isolation signals conveyer.