Zero-voltage-switching quasi-resonant converters with multi-resonant bipolar switch

• US 5,343,140 A
• Filed: 12/02/1992
• Issued: 08/30/1994
• Est. Priority Date: 12/02/1992
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Gegner, Joel P.
• Primary Examiner(s): Stephan, Steven L.
• Assistant Examiner(s): BERHANE, ADOLF D
• Application Number:
  US07/984,153
• Time in Patent Office: 636 Days
• Field of Search: 323/282, 323/235, 323/271, 323/222, 323/351, 363/16, 363/39, 363/124, 363/15, 363/40, 363/123, 363/131, 363/20
• US Class Current: 323/222
• CPC Class Codes: G05F 1/618 using semiconductor devices in series and in parallel with the load as final control devices G05F1/461 takes precedence
• CPC Class Codes: H02M 1/0058 by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero using an auxiliary actively switched resonant commutation circuit connected to an intermediate DC voltage or between two push-pull branches of an inverter bridge H02M7/4811; in resonant inverters H02M7/4815; in inverters operating from a resonant DC source H02M7/4826
• CPC Class Codes: H02M 3/01 Resonant DC/DC converters
• CPC Class Codes: H02M 3/155 using semiconductor devices only
• CPC Class Codes: Y02P 80/10 Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Abstract

A compact, high frequency, zero voltage switching quasi-resonant converter with a multi-resonant, bi-polar switch includes a resonant switch (S), a first diode (D_p) in parallel with the switch (S), a second diode (D_s)in series with the switch (S), first (C_r1) and second (C_r2) resonant capacitors and a resonant inductor (L_r). The first resonant capacitor (C_r1) is operatively connected to the resonant switch (S) such that any voltage change across the first resonant capacitor (C_r1) necessitates a corresponding voltage change across the resonant switch (S). The second resonant capacitor (C_r2)is operatively connected to the second diode (D_s) such that any voltage change across the second resonant capacitor (C_r2) necessitates a corresponding voltage change across the second diode (D_p). The resonant inductor (L_r) is operatively connected in series with the resonant switch (S) such that any current change through the resonant inductor (L_r) necessitates corresponding changes in the sum of currents flowing through the first resonant capacitor (C_r1), first diode (D_p), and the resonant switch (S), and the sum of currents flowing through the second resonant capacitor (C_r2) and the second diode (D_s).

Claims

1. A variable frequency, zero-voltage switched, multi-resonant converter for receiving power from a power source and providing power to a load, said converter including rectifying means for directing power from the power source to the load and optionally including at least one of a filtering inductor and a filtering capacitor, said converter comprising:

(a) a resonant switch means (S) for connecting and disconnecting said power source to and from said load;

(b) a first diode (D_p) in parallel with said switch means (S);

(c) a second diode (D_S) in series with said switch means (S);

(d) a first resonant capacitor (C_r1);

(e) a second resonant capacitor (C_r2);

(f) a resonant inductor (L_r);

wherein said first resonant capacitor (C_r1) is operatively connected to said resonant switch means (S) such that any voltage change across said first resonant capacitor (C_r1) necessitates a corresponding voltage change across said resonant switch means (S) such that ##EQU33## and wherein said second resonant capacitor (C_r2) is operatively connected to said second diode (D_s) such that any voltage change across said second resonant capacitor (C_r2) necessitates a corresponding voltage change across said second diode (D_s) such that ##EQU34## and wherein said resonant inductor (L_r) is operatively connected in series with said resonant switch means (S) such that any current change through said resonant inductor (L_r) necessitates a corresponding change in a sum of currents flowing through said first resonant capacitor (C_r1), said first diode (D_p), and said resonant switch means (S);

and wherein any current change through said resonant inductor (L_r) necessitates a corresponding change in a sum of currents flowing through said second resonant capacitor (C_r2) and said second diode (D_s), such that ##EQU35## and wherein the sum of instantaneous currents flowing through C_r2 and D_s always equals the sum of currents flowing through C_r1, S, and D_p when said converter is operatively connected to said power source.

2. The variable frequency, zero-voltage switched, multi-resonant converter of claim 1 wherein said switch means comprises semi-conductor means.

3. The variable frequency, zero-voltage switched, multi-resonant converter of claim 1 wherein said switch means comprises bi-polar transistor means.

4. The variable frequency, zero switched, multi-resonant converter of claim 1 wherein said switch means comprises FET means.

5. The variable frequency, zero voltage switched, multi-resonant converter of claim 1 wherein said switch means and said first diode comprises MOSFET means.

6. The variable frequency, zero voltage switched, multi-resonant converter of claim 1 wherein said switch means comprises IGBT means.