CN-224204996-U - Full-bridge converter module without blocking capacitor

Abstract

The utility model discloses a full-bridge converter module without blocking capacitors, which comprises an input filter unit, an inversion first bridge arm, an inversion second bridge arm, a planar transformer T, a rectification first bridge arm, a rectification second bridge arm, a planar inductor Lf, an output capacitor Co and a square wave detection unit M, wherein the output capacitor Co is connected between an output positive end and an output negative end, a load Rload is connected between the output positive end and the output negative end, the full-bridge converter module adopts a planar magnetic technology, is free of blocking capacitor configuration, calculates positive and negative volt-second products and outputs a duty ratio control quantity by sampling square wave voltages of a resistor voltage division circuit and driving edge moments captured by a comparator circuit, dynamically adjusts a primary full-bridge driving signal pulse width, realizes magnetic flux balance control, solves the problem of large occupied area of the blocking capacitors, and is beneficial to realizing high-power density design of a brick power supply module.

Inventors

• LU WEIWEI
• XU PENGCHENG

Assignees

• 南京能利芯科技有限公司

Dates

Publication Date

20260505

Application Date

20250411

Claims (2)

1. 1. The full-bridge converter module without the blocking capacitor comprises an input filtering unit, an inversion first bridge arm, an inversion second bridge arm, a planar transformer T, a rectification first bridge arm, a rectification second bridge arm, a planar inductor Lf, an output capacitor Co and a square wave detection unit M, wherein the output capacitor Co is connected between an output positive end and an output negative end; The input filter unit is characterized by comprising an input filter inductor Lin and an input filter capacitor Cin, wherein one end of the input filter inductor Lin is connected with an input positive end, the other end of the input filter inductor Lin is connected with one end of the input filter capacitor Cin, the other end of the input filter capacitor Cin is connected with an input negative end, an inversion first bridge arm and an inversion second bridge arm are connected in parallel with two ends of the input filter capacitor Cin, two ends of a rectification first bridge arm and two ends of a rectification second bridge arm are connected in parallel, one end of a plane inductor Lf is electrically connected with one end of the rectification second bridge arm, and the other end of the plane inductor Lf is connected with one end of an output capacitor Co close to the output positive end; The first bridge arm comprises a first inversion power switching tube Q1 and a second inversion power switching tube Q2, wherein the first inversion power switching tube Q1 and the second inversion power switching tube Q2 are connected in series and are electrically connected between two ends of an input filter capacitor Cin; The first bridge arm comprises a first rectification power switching tube S1 and a second rectification power switching tube S2, wherein the first rectification power switching tube S1 and the second rectification power switching tube S2 are connected in series and then are electrically connected between one end of a plane inductor Lf and one end of an output capacitor; the planar transformer T comprises a primary winding and a secondary winding, wherein two ends of the primary winding are respectively and electrically connected with the midpoint of the inversion first bridge arm and the midpoint of the inversion second bridge arm; The planar transformer T comprises a first winding module (26) and two first magnetic core modules (18) which are respectively buckled at two sides of the winding module, wherein the first winding module (26) comprises a first magnetic core center column through hole (13) which is arranged on a circuit board (11) in a penetrating way, a first side column through hole (12) and a second side column through hole (14) which are arranged on the circuit board (11) in a penetrating way are symmetrically arranged at two sides of the first magnetic core center column through hole, and the areas of the first magnetic core center column through hole (13) and the first side column through hole (12) and the second side column through hole (14) are unequal; a first magnetic core module (18) of the planar transformer T is provided with a magnetic core center pillar (20) matched with the first magnetic core center pillar through hole (13), a first magnetic core side pillar (19) matched with the first side pillar through hole (12) and a second magnetic core side pillar (21) matched with the second side pillar through hole (14), and the top surfaces of the first magnetic core center pillar, the first magnetic core side pillar top surface and the second magnetic core side pillar top surface of the first magnetic core module (18) at two sides are mutually attached; the secondary winding of the planar transformer T is arranged on an inner layer plate of the circuit board around the first magnetic core center post through hole (13), the primary winding is arranged on the inner layer plate of the circuit board (11) around the first magnetic core center post through hole (13) and is positioned on a different inner layer plate from the secondary winding, and the secondary winding and the primary winding of the transformer T both comprise at least one turn of coil; The plane inductor Lf comprises a second winding module (10) and two second magnetic core modules (22) which are respectively buckled at two sides of the second winding module (10), wherein the second winding module (10) comprises a second magnetic core center column through hole (16) which is communicated with a circuit board (11), a third side column through hole (15) and a fourth side column through hole (17) which are communicated are symmetrically arranged at two sides of the second magnetic core center column through hole (16), and the areas of the second magnetic core center column through hole (16) and the third side column through hole (15) and the fourth side column through hole (17) are unequal; The plane inductor Lf is characterized in that a second magnetic core center pillar (24) matched with a second magnetic core center pillar through hole (16) is arranged on a second magnetic core module (22), a third magnetic core side pillar (23) matched with a third side pillar through hole (15) and a fourth magnetic core side pillar (25) matched with a fourth side pillar through hole (17) are arranged on the second magnetic core module, and the top surfaces of the second magnetic core center pillar, the top surfaces of the third magnetic core side pillar and the top surfaces of the four magnetic core side pillars of the second magnetic core module (22) at two sides are mutually attached; The planar inductor Lf winding is arranged on the inner layer board of the circuit board (11) around the second magnetic core center pillar through hole (16) and comprises at least one turn of coil.
2. 2. The full-bridge inverter module without blocking capacitor as set forth in claim 1, wherein the square wave detection unit M comprises a first resistor R1 and a second resistor R2 connected in series, the first resistor R1 and the second resistor R2 are connected in series and then connected in parallel to two ends of a rectifying second bridge arm, the filter capacitor C1 is connected in parallel to two ends of the second resistor R2, a sampling voltage point of the comparator U1 is arranged on a connecting line between the first resistor R1 and the second resistor R2, and the comparator U1 is electrically connected with the digital controller.

Description

Full-bridge converter module without blocking capacitor Technical Field The utility model relates to the technical field of power electronic power conversion, in particular to a high-density full-bridge converter module which is based on a planar magnetic technology and can realize the magnetic flux balance of a transformer without a blocking capacitor. Background In order to realize the magnetic flux balance of the transformer, the traditional full-bridge converter needs to be connected with a blocking capacitor in series at the primary side of the transformer, but the blocking capacitor PCB occupies large area, which is not beneficial to improving the power density of a brick power supply. In addition, the charge and discharge process of the blocking capacitor introduces extra delay, limiting the loop bandwidth. The prior art attempts to reduce magnetic bias by driving symmetry optimization, but the duty cycle deviation exceeding 0.5% still results in magnetic saturation. Therefore, a solution that does not require a dc blocking capacitor and can precisely control the flux balance is needed for brick power supplies. Disclosure of utility model The utility model aims to solve the technical problem of providing a full-bridge converter module which is free of a blocking capacitor and realizes magnetic flux balance. In order to solve the technical problems, the utility model adopts the technical scheme that the full-bridge converter module without the blocking capacitor comprises an input filter unit, an inversion first bridge arm, an inversion second bridge arm, a planar transformer T, a rectification first bridge arm, a rectification second bridge arm, a planar inductor Lf, an output capacitor Co and a square wave detection unit M, wherein the output capacitor Co is connected between an output positive end and an output negative end; The input filter unit comprises an input filter inductor Lin and an input filter capacitor Cin, wherein one end of the input filter inductor Lin is connected with an input positive end, the other end of the input filter inductor Lin is connected with one end of the input filter capacitor Cin, the other end of the input filter capacitor Cin is connected in an input negative mode, the inversion first bridge arm and the inversion second bridge arm are connected in parallel with two ends of the input filter capacitor Cin, two ends of the rectification first bridge arm and the rectification second bridge arm are connected in parallel, one end of a plane inductor Lf is electrically connected with one end of the rectification second bridge arm, and the other end of the plane inductor Lf is connected with one end of the output capacitor Co close to the output positive end; The first bridge arm comprises a first inversion power switching tube Q1 and a second inversion power switching tube Q2, wherein the first inversion power switching tube Q1 and the second inversion power switching tube Q2 are connected in series and are electrically connected between two ends of an input filter capacitor Cin; The first bridge arm comprises a first rectification power switching tube S1 and a second rectification power switching tube S2, wherein the first rectification power switching tube S1 and the second rectification power switching tube S2 are connected in series and then are electrically connected between one end of a plane inductor Lf and one end of an output capacitor; the planar transformer T comprises a primary winding and a secondary winding, wherein two ends of the primary winding are respectively and electrically connected with the midpoint of the inversion first bridge arm and the midpoint of the inversion second bridge arm; the planar transformer T comprises a first winding module and two first magnetic core modules which are respectively buckled at two sides of the winding module, wherein the first winding module comprises a first magnetic core center pillar through hole which is arranged on a circuit board in a penetrating way, a first side pillar through hole and a second side pillar through hole which are arranged on the circuit board in a penetrating way are symmetrically arranged at two sides of the first magnetic core center pillar through hole, and the areas of the first magnetic core center pillar through hole and the first side pillar through hole are unequal to the areas of the second side pillar through hole; the planar transformer T is characterized in that a first magnetic core module is provided with a magnetic core center pillar matched with a first magnetic core center pillar through hole, a first magnetic core side pillar matched with a first side pillar through hole and a second magnetic core side pillar matched with a second side pillar through hole, and the top surfaces of the first magnetic core center pillar, the first magnetic core side pillar and the second magnetic core side pillar of the first magnetic core module at two sides are mutually attached; The seconda