TWI446379B - Transformer structure and its application of rectifier circuit - Google Patents

Description

Transformer structure and its suitable rectifier circuit

The invention relates to a transformer structure and a rectifying circuit suitable for the same, in particular to a transformer and a rectifying circuit capable of increasing heat dissipation efficiency, reducing volume and process cost, reducing loss and improving performance.

The switching power converter circuit uses the switching operation of the internal switching element to convert the received voltage level into a plurality of predetermined levels; taking the switching DC/DC converter as an example, converting the DC voltage level into other levels The DC voltage level generally uses a rectifying circuit to rectify and filter the received voltage level. Since the current DC/DC converter design is gradually developed with high efficiency and low loss, that is, The output is output in the form of low voltage and large current. Therefore, the current industry uses a current-doubler rectifier circuit as the output rectifier circuit to achieve the high efficiency DC/DC converter design efficiency and purpose.

Since the current doubler rectifier circuit is designed to reduce the loss of the DC/DC converter, since it is mainly composed of a transformer and at least one inductor element, and the separation between the two is adopted, there are still many problems. . First, the secondary winding of the transformer of the conventional double current rectifying circuit is formed by winding a coil around the magnetic core group. Since the overall surface of the coil is actively small, the overall heat dissipation efficiency of the transformer is poor, resulting in an increase in coil impedance, and DC/ DC converters are generally large current outputs, which generate a lot of losses and heat during operation. Therefore, for high-performance DC/DC converters, the transformer structure using the traditional coil winding method as the secondary winding will be highlighted. The above is missing.

Therefore, how to develop a transformer structure that can improve the efficiency and increase the heat dissipation capability to improve the above-mentioned defects, and the rectifier circuit to which it is applied, is an urgent problem to be solved in the industry.

In view of the above-mentioned shortcomings of the transformer structure and the rectifying circuit to which it is applied, the inventors have studied the improvement of these disadvantages, and finally the present invention has been produced.

The main object of the present invention is to provide a transformer structure, which can effectively reduce line loss, improve heat dissipation efficiency, and reduce transformer process cost.

Another object of the present invention is to provide a rectifying circuit suitable for the foregoing transformer structure, which can reduce the loss of voltage conversion and improve the overall performance.

In order to achieve the above object and effect, the technical means adopted include: a transformer structure comprising at least: a bobbin having a central hole penetrating therethrough, and a plurality of sides perpendicular to the central side of the central hole a separation slot of the hole; a primary coil consisting of a metal enameled wire uniformly distributed around each of the separation slots of the bobbin, and the two ends of the primary coil form a voltage input end; the plurality of secondary conductive sheets are made of metal The sheet is bent to conform to at least a portion of the outer peripheral edge shape of the bobbin, and is respectively accommodated in each of the separation grooves, and a convex insertion portion is respectively disposed at two ends of each of the secondary conductive sheets; at least one E-shaped iron core has An intermediate portion and a side portion thereof, the intermediate portion can extend into the central hole of the bobbin, and the two sides can form a cover on the side of the bobbin; a fixed circuit board Each of the secondary conductive sheets can be inserted and fixed by two convex insertion portions, and each of the secondary conductive sheets can be collected to form a voltage output end.

A rectifying circuit suitable for the foregoing transformer, comprising at least: four switching elements disposed between the input power source and a voltage input end of the primary coil of the transformer in a bridge connection manner; and two switching elements disposed at a voltage of the transformer Between the output terminals, a ground is formed between the two switching elements; a control circuit can respectively control the four switching elements of the voltage input end of the transformer and the two switching elements of the voltage output end to be turned on or off respectively; The two inductor elements are respectively connected between the voltage output ends of the transformers at one end, and the other ends of the two inductor elements are connected to form an output end for connection to the load.

In order to achieve a more specific understanding of the above objects, effects and features of the present invention, the following figures are illustrated as follows:

Referring to Figures 1 and 2, it can be clearly seen that the structure of the transformer 1 of the present invention mainly includes: a bobbin 11, a primary coil 15, a secondary conductive piece 12, an E-shaped iron core 16, a fixed circuit board 13, A portion of the insulating cover 14 and the like, wherein the bobbin 11 has a central hole 111 therethrough, and a plurality of partitioning grooves 112 perpendicular to the central hole 111 are disposed on the outer peripheral side of the central hole 111, and are disposed in the separating slots 112. At least one notch portion 114 is disposed on the bobbin 11 , and a plurality of conductive terminals 113 are formed on the bobbin 11 , and the primary coil 15 is composed of a metal (copper) enameled wire wound around each of the separation slots 112 of the bobbin 11 , and The primary coils 15 can be evenly distributed in the bottom of each of the partitioning grooves 112 by the communication of the notches 114, and the two ends of the primary coils 15 can be connected to the conductive terminals 113 to form a voltage input terminal. The terminal 113 is also solderable to a predetermined circuit board for engaging with external electronic components, and the plurality of secondary conductive sheets 12 are bent from a metal (copper) sheet to conform to at least a portion of the outer peripheral shape of the bobbin. They can be respectively accommodated in the respective separation grooves 112 and stacked on the primary coil 15 The two ends of each of the secondary conductive sheets 12 are respectively provided with a protruding portion 121. The fixed circuit board 13 is provided for each of the secondary conductive sheets 12 to be inserted and fixed by the two protruding portions 121, and the secondary conductive sheets 12 can be collected. The insulating cover 14 is sleeved on the outer side of the bobbin 11 to form an insulating isolation, and the insulating cover 14 is provided with two corresponding ends of the central hole 111. The through hole 141, the two E-shaped cores 16 respectively have an intermediate portion 161 and two side portions 162 thereof, and the intermediate portion 161 can extend into the central hole of the bobbin 11 through the through hole 141 of the insulating cover 14 In the 111, the two side portions 162 can form a cover on the two sides of the bobbin 11, so that a magnetic conductive circuit is formed on the center and the circumferential side of the bobbin 11.

The structure of the transformer 1 described above is characterized in that the secondary conductive sheet 12 bent by the metal (copper) sheet has the characteristics of large cross-sectional area and surface area, and can be used to cancel the winding, in addition to increasing the heat dissipation efficiency and reducing the overall volume. The secondary coil of the form reduces the overall process cost and thus the competitiveness of the product.

Referring to Figures 3 and 4, it can be clearly seen that the rectifier circuit of the present invention applied to the transformer 1 mainly includes: switching elements D1 to D4, switching elements DX, DY, control circuit 2, inductance elements L1, L2, etc. In some parts, the switching elements D1 to D4 are disposed in a bridge connection manner between the voltage input end of the primary coil 15 of the transformer 1 and the input power source Vin, and the switching elements DX and DY are disposed in the voltage of the transformer 1. Between the output terminals, a ground is formed between the two switching elements DX and DY, and the inductance elements L1 and L2 are respectively connected between the voltage output ends of the transformer 1 at one end, and the other ends of the two inductance elements L1 and L2. Connected to an output terminal, the output terminal can be grounded via a capacitor Co, and then connected to a load RL. The control circuit 2 can be connected to the output ends of the two inductance components L1 and L2, and can respectively control the switching component D1. ~D4, and the switching elements DX, DY, respectively, are turned on or off.

When the above circuit is in operation, the switching elements D1 to D4 of the bridge type are simultaneously operated (turned on or off) by the switching elements D1, D4 or D2 and D3 on the diagonal side; when the switching elements D1 and D4 are simultaneously turned on, the switch The components 2 and 3 are simultaneously turned off, and the current of the input power source Vin reaches the primary coil of the transformer 1 through the switching element 1 through the positive terminal, and then returns to the negative pole of the input power source Vin through the switching element 4, and the secondary side of the transformer 1 is made on the secondary side of the transformer 1 The switching element Y is turned on, the switching element X is turned off, and the current on the secondary side flows out from the secondary conductive piece of the transformer 1, passes through the inductance element L1, the capacitance Co outputs the load RL, and then returns to the transformer 1 through the switching element Y; If the switching elements 2, 3 are simultaneously turned on, the switching elements D1, D4 are simultaneously turned off, the current of the input power source Vin is passed from the positive electrode to the primary coil via the switching element 3, and then returned to the negative terminal of the input power source Vin through the switching element 2, and the transformer 1 On the secondary side, the switching element Y is turned off, the switching element X is turned on, and the current on the secondary side flows out from the secondary conductive piece of the transformer 1, through the inductance element L2, the capacitance Co output is connected to the load RL, and then the switch passes through the ground. X pieces back transformer 1; by the above two loop interoperable to complete energy conversion function.

In summary, the transformer structure of the present invention and the rectifying circuit thereof can achieve the effects of increasing heat dissipation efficiency, reducing volume and process cost, and reducing loss and improving performance, which is a novel and progressive invention.申请Applying for invention patents in accordance with the law; however, the above description is only for the preferred embodiment of the present invention, and any changes, modifications, changes or equivalent replacements in accordance with the technical means and scope of the present invention should also be It is within the scope of the patent application of the present invention.

1. . . transformer

11. . . Winding frame

111. . . Central hole

112. . . Separation slot

113. . . Conductive terminal

114. . . Notch

12. . . Secondary conductive sheet

121. . . Convex insertion

13. . . Fixed circuit board

14. . . Insulating housing

141. . . Through hole

15. . . Primary coil

16. . . E-shaped iron core

161. . . Middle part

162. . . Side

2. . . Control circuit

D1~D4, DX~DY. . . Switching element

L1, L2. . . Inductive component

Vin. . . Input power

Co. . . capacitance

RL. . . load

Figure 1 is a structural exploded view of the transformer of the present invention.

Figure 2 is a partial schematic view of the combination of the transformer of the present invention.

Figure 3 is an overall circuit diagram of the transformer and rectifier circuit of the present invention.

Figure 4 is an overall reference appearance of one of the present inventions.

1. . . transformer

11. . . Winding frame

111. . . Central hole

112. . . Separation slot

113. . . Conductive terminal

114. . . Notch

12. . . Secondary conductive sheet

121. . . Convex insertion

13. . . Fixed circuit board

14. . . Insulating housing

141. . . Through hole

15. . . Primary coil

16. . . E-shaped iron core

161. . . Middle part

162. . . Side

Claims (3)

A rectifier circuit suitable for a transformer, comprising at least: four switching elements arranged in a bridge connection between an input power source and a voltage input end of a primary coil of the transformer; and two switching elements arranged at a voltage output of the transformer Between the terminals, a ground is formed between the two switching elements; a control circuit can respectively control the four switching elements of the voltage input end of the transformer and the two switching elements of the voltage output end to be turned on or off respectively; The inductor element is connected between the voltage output ends of the transformer at one end and the other end of the two inductor elements is connected to an output terminal for connection to the load. The rectifying circuit of claim 1, wherein the output end of the two inductive elements is further provided with a capacitor. The rectifier circuit of claim 1, wherein the control circuit is coupled to an output end of the connection of the two inductance elements.