Isolated converter with high boost ratio

Patent metadata

Field	Value
Publication number	US-11088629-B2
Application number	US-202016867242-A
Country	US
Kind code	B2
Filing date	May 5, 2020
Priority date	Jun 12, 2019
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

An isolated converter with high boost ration includes a transformer, a first bridge arm, a second bridge arm, and a boost circuit. The transformer includes a secondary side having a secondary side first node and a secondary side second node. The first bridge arm includes a first diode and a second diode. The second bridge arm includes a third diode and a fourth diode. The boost circuit includes at least one fifth diode coupled between the first bridge arm and the secondary side second node, at least one sixth diode coupled between the second bridge arm and the secondary side first node, and at least two capacitors coupled to the secondary side first node and the secondary side second node.

First claim

What is claimed is:

1. An isolated converter with high boost ratio comprising:
a transformer comprising a secondary side having a secondary side first node and a secondary side second node,
a first bridge arm having a first diode and a second diode; a cathode of the first diode coupled to a DC positive output node, an anode of the first diode coupled to a first bridge arm upper node, an anode of the second diode coupled to a DC negative output node, and a cathode of the second diode coupled to a first bridge arm lower node,
a second bridge arm having a third diode and a fourth diode; a cathode of the third diode coupled to the DC positive output node, an anode of the third diode coupled to a second bridge arm upper node, an anode of the fourth diode coupled to the DC negative output node, and a cathode of the fourth diode coupled to a second bridge arm lower node, and
a boost circuit, comprising:
a fifth diode coupled between the first bridge arm and the secondary side second node,
a sixth diode coupled between the second bridge arm and the secondary side first node, and
two capacitors, including a first capacitor and a second capacitor, coupled to the secondary side first node and the secondary side second node,

wherein two ends of the first capacitor are directly connected to the secondary side first node and the first bridge arm upper node, and two ends of the second capacitor are directly connected to the secondary side second node and the second bridge arm upper node, and
wherein a cathode of the fifth diode is directly connected to the first bridge arm upper node, and an anode of the fifth diode is directly connected to the secondary side second node; a cathode of the sixth diode is directly connected to the second bridge arm upper node, and an anode of the sixth diode is directly connected to the secondary side first node.

2. The isolated converter with high boost ratio in claim 1 , wherein when the isolated converter operates in a first quadrant,
a main current flows through the secondary side, the second capacitor, the third diode, the DC positive output node, the DC negative output node, the second diode, and the secondary side,
a pre-charge current flows through the secondary side, the fifth diode, the first capacitor, and the secondary side.

3. The isolated converter with high boost ratio in claim 1 , wherein when the isolated converter operates in a third quadrant,
a main current flows through the secondary side, the first capacitor, the first diode, the DC positive output node, the DC negative output node, the fourth diode, and the secondary side,
a pre-charge current flows through the secondary side, the sixth diode, the second capacitor, and the secondary side.

4. An isolated converter with high boost ratio comprising:
a transformer comprising a secondary side having a secondary side first node and a secondary side second node,
a first bridge arm having a first diode and a second diode; a cathode of the first diode coupled to a DC positive output node, an anode of the first diode coupled to a first bridge arm upper node, an anode of the second diode coupled to a DC negative output node, and a cathode of the second diode coupled to a first bridge arm lower node,
a second bridge arm having a third diode and a fourth diode; a cathode of the third diode coupled to the DC positive output node, an anode of the third diode coupled to a second bridge arm upper node, an anode of the fourth diode coupled to the DC negative output node, and a cathode of the fourth diode coupled to a second bridge arm lower node, and
a boost circuit, comprising:
a fifth diode coupled between the first bridge arm and the secondary side second node,
a sixth diode coupled between the second bridge arm and the secondary side first node, and
two capacitors, including a first capacitor and a second capacitor, coupled to the secondary side first node and the secondary side second node,

wherein two ends of the first capacitor are directly connected to the secondary side first node and the first bridge arm lower node, and two ends of the second capacitor are directly connected to the secondary side second node and the second bridge arm lower node, and
wherein an anode of the fifth diode is directly connected to the first bridge arm lower node, and a cathode of the fifth diode is directly connected to the secondary side second node; an anode of the sixth diode is directly connected to the second bridge arm lower node, and a cathode of the sixth diode is directly connected to the secondary side first node.

5. The isolated converter with high boost ratio in claim 4 , wherein when the isolated converter operates in a first quadrant,
a main current flows through the secondary side, the third diode, the DC positive output node, the DC negative output node, the second diode, the first capacitor, and the secondary side,
a pre-charge current flows through the secondary side, the second capacitor, the sixth diode, and the secondary side.

6. The isolated converter with high boost ratio in claim 4 , wherein when the isolated converter operates in a third quadrant,
a main current flows through the secondary side, the first diode, the DC positive output node, the DC negative output node, the fourth diode, the second capacitor, and the secondary side,
a pre-charge current flows through the secondary side, the first capacitor, the fifth diode, and the secondary side.

7. An isolated converter with high boost ratio comprising:
a transformer comprising a secondary side having a secondary side first node and a secondary side second node,
a first bridge arm having a first diode and a second diode; a cathode of the first diode coupled to a DC positive output node, an anode of the first diode coupled to a first bridge arm upper node, an anode of the second diode coupled to a DC negative output node, and a cathode of the second diode coupled to a first bridge arm lower node,
a second bridge arm having a third diode and a fourth diode; a cathode of the third diode coupled to the DC positive output node, an anode of the third diode coupled to a second bridge arm upper node, an anode of the fourth diode coupled to the DC negative output node, and a cathode of the fourth diode coupled to a second bridge arm lower node, and
a boost circuit, comprising:
two fifth diodes, including an upper fifth diode and a lower fifth diode, coupled between the first bridge arm and the secondary side second node,
two sixth diodes, including an upper sixth diode and a lower sixth diode, coupled between the second bridge arm and the secondary side first node, and
four capacitors, including a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor, coupled to the secondary side first node and the secondary side second node,

wherein two ends of the first capacitor are coupled to the secondary side first node and the first bridge arm upper node, two ends of the second capacitor are coupled to the secondary side second node and the second bridge arm upper node, two ends of the third capacitor are coupled to the secondary side first node and the first bridge arm lower node, and two ends of the fourth capacitor are coupled to the secondary side second node and the second bridge arm lower node,
wherein a cathode of the upper fifth diode is coupled to the first bridge arm upper node, and an anode of the upper fifth diode is coupled to the secondary side second node; a cathode of the upper sixth diode is coupled to the second bridge arm upper node, and an anode of the upper sixth diode is coupled to the secondary side first node, and
wherein an anode of the lower fifth diode is coupled to the first bridge arm lower node, and a cathode of the lower fifth diode is coupled to the secondary si

Assignees

• Delta Electronics Inc

Inventors

• Lin Hung-Chieh
• Kao Chao-Li
• Hsieh Yi-Ping
• Huang jin-zhong
• Kuo Chao-Lung
• Huang Hung-Yu
• Li Chih-Hsien

Classifications

• H02M3/33553

  with galvanic isolation between input and output of both the power stage and the feedback loop · CPC title

• H02M3/33592 Primary

  having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer · CPC title

• H02M3/07

  using capacitors charged and discharged alternately by semiconductor devices with control electrode {, e.g. charge pumps} · CPC title

• Y02B70/10

  Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes · CPC title

• H02M3/33584

  Bidirectional converters · CPC title