System and method for wireless power transfer using a power converter with a bypass mode

• US 10,749,350 B2
• Filed: 04/02/2018
• Issued: 08/18/2020
• Est. Priority Date: 10/27/2015
• Status: Active Grant

• Current Assignee: Integrated Device Technology Incorporated (Renesas Electronics Corporation)
• Original Assignee: Integrated Device Technology Incorporated (Renesas Electronics Corporation)
• Inventors: Pagano, Rosario, Daffron, Christopher Joseph, Gomez Arguello, Angel Maria, Abedinpour, Siamak
• Primary Examiner(s): Barnie, Rexford N
• Assistant Examiner(s): Ortiz, Elim
• Application Number:
  US15/943,531
• Publication Number:
  US 20180294653A1
• Time in Patent Office: 869 Days
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02M 1/0045 Converters combining the concepts of switch-mode regulation and linear regulation, e.g. linear pre-regulator to switching converter, linear and switching converter in parallel, same converter or same transistor operating either in linear or switching mode
• CPC Class Codes: H02M 3/158 including plural semiconductor devices as final control devices for a single load

Abstract

A system and method of wireless power transfer using a power converter with a bypass mode includes a power converter. The power converter includes a pulsed switch, a capacitor configured to supply a drive voltage to the pulsed switch, a first circuit configured to charge the capacitor when the power converter operates in a switched mode of operation, and, a second circuit configured to charge the capacitor when the power converter operates in a bypass mode of operation.

Claims

1. A system comprising:

a feedback circuit that generates a pulse width modulation signal based on an output voltage of a power converter and a reference voltage; and

a threshold voltage detection circuit, the threshold voltage detection circuit comprising;

a one-shot receiving the pulse-width modulation signal and producing a one-shot signal, a set duration of the one-shot being determined by an RC time constant; and

a logic block coupled to receive the set duration from the one-shot and a delayed pulsed-width modulation signal, the logic block comparing a duration of an off period of the delayed pulse-width modulation signal and the set duration,

wherein the threshold voltage detection circuit is configured to;

determine whether a duty cycle of the pulse width modulation signal is considered high for a set number of cycles of the pulse width modulation signal, the duty cycle being considered high when the duration of the off period of the duty cycle is less than the set duration;

when the duty cycle is considered high for the set number of cycles;

send a first signal to close a bypass switch associated with the power converter; and

send a second signal to enable a charge pump associated with a pulsed switch associated with the power converter.

2. The system of claim 1, wherein the pulsed switch is a high-side n-type transistor.

3. The system of claim 1, wherein the power converter has a synchronous buck topology.

4. The system of claim 1, further comprising an over-current protection module associated with the bypass switch.