Zero voltage, zero current switching boost converter

• US 20020047693A1
• Filed: 09/12/2001
• Published: 04/25/2002
• Est. Priority Date: 10/23/2000
• Status: Active Grant

• Current Assignee: Delta Electronics Incorporated
• Original Assignee: Delta Electronics Incorporated
• Inventors: Chang, Yu-Ming
• Granted Patent: US 6,498,463 B2
• Time in Patent Office: Days
• US Class Current: 323/222
• CPC Class Codes: H02M 1/34 Snubber circuits
• CPC Class Codes: H02M 1/342 Active non-dissipative snubbers
• CPC Class Codes: H02M 1/4208 Arrangements for improving power factor of AC input
• CPC Class Codes: H02M 1/44 Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• CPC Class Codes: H02M 3/158 including plural semiconductor devices as final control devices for a single load
• CPC Class Codes: Y02B 70/10 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

Abstract

A zero voltage, zero current switching boost converter comprises a boost section including a main switch for receiving a first DC power and outputting a second DC power, and a resonant circuit comprising a first discharge loop including a first auxiliary switch and a second discharge loop including a second auxiliary switch for permitting the first DC power to discharge alternately through the first discharge loop and the second discharge loop to a load to generate the second DC power, and the boost converter is characterized by the main switch is turned on and off under a zero voltage circumstances and both the first auxiliary switch and the second auxiliary switch are turned on and off under a zero current circumstances, thereby reducing switching loss incurred herewith, suppressing electromagnetic interference and radio frequency interference of the resonant circuit, and miniaturizing the switch element and obtaining a better overall conversion efficiency.

Claims

1. A zero voltage, zero current switching boost converter comprising:

a boost section comprising a main switch for receiving a first direct current power and outputting a second direct current power; and

a resonant circuit comprising a first discharge loop including a first auxiliary switch and a second discharge loop including a second auxiliary switch for permitting said first direct current power to discharge alternately through said first discharge loop and said second discharge loop to a load to generate said second direct current power;

wherein said main switch is turned on and off under a zero voltage circumstances and both said first auxiliary switch and said second auxiliary switch are turned on and off under a zero current circumstances.

2. The boost converter of claim 1 wherein said boost section further comprises a boost choke.

3. The boost converter of claim 1 wherein said load comprises a first output capacitor and a second output capacitor.

4. The boost converter of claim 3 wherein said first discharge loop further comprises a resonant inductor, said second output capacitor and a second main diode.

5. The boost converter of claim 4 wherein said second discharge loop further comprises a first main diode, said first output capacitor and said resonant inductor.

6. The boost converter of claim 1 wherein both said first auxiliary switch and said second auxiliary switch comprise a unidirectional switch.

7. The boost converter of claim 6 wherein said unidirectional switch comprises one selected from a silicon controlled rectifier (SCR) and an insulated gate bipolar transistor (IGBT) with a relatively high collector-emitter reverse-biased voltage with gate opened (V_CEO).

8. The boost converter of claim 6 wherein said unidirectional switch comprises an insulated gate bipolar transistor (IGBT) with a relatively low collector-emitter reverse-biased voltage with gate opened (V_CEO).

9. The boost converter of claim 8 wherein said resonant circuit further comprises a first auxiliary diode and a second auxiliary diode respectively connected with said first auxiliary switch and said second auxiliary switch.