Некоторое содержание этого приложения в настоящий момент недоступно.
Если эта ситуация сохраняется, свяжитесь с нами по адресуОтзывы и контакты
1. (WO2019032125) SOFT-START CIRCUIT FOR SWITCHED RESONANT POWER CONVERTERS
Примечание: Текст, основанный на автоматизированных процессах оптического распознавания знаков. Для юридических целей просьба использовать вариант в формате PDF

WHAT IS CLAIMED IS:

1. A switched resonant power converter, comprising:

a plurality of switching transistors connected in series;

a resonant circuit comprising a capacitor and an inductor, and connected at a first node Unking two of the connected plurality of switching transistors;

an auxiliary soft-start bypass circuit connected at the first node and comprising one or more auxiliary transistors and an impedance element, the auxiliary soft-start bypass circuit providing an auxiliary circuit path in parallel to a first switching transistor of the plurality of switching transistors and through the impedance element to the resonant circuit when the auxiliary soft-start bypass circuit is activated and the first switching transistor is deactivated; and a control circuit configured to switch to (1) an operational mode in which the auxiliary soft-start bypass circuit is deactivated and the plurality of switching transistors are switched according to a switching cycle to provide a first frequency-responsive power through the resonant circuit, from (2) a soft-start mode in which the auxiliary soft-start bypass circuit is activated and one or more auxiliary transistors are switched according to the switching cycle in place of one or more of the plurality of switching transistors to provide a second frequency-responsive power through the resonant circuit.

2. The switched resonant power converter of claim 1, wherein the impedance element comprises a resistor or an inductor.

3. The switched resonant power converter of claim 2, wherein the resonant circuit is a series resonant circuit, and the capacitor and the inductor of the resonant circuit are connected in series.

4. The switched resonant power converter of claim 2, wherein the resonant circuit is a parallel resonant circuit including two inductors and capacitor.

5. The switched resonant power converter of claim 1, wherein the one or more auxiliary transistors comprises first and second auxiliary transistors connected in series, and wherein the impedance element is connected between the first node and a second node linking the first and second auxiliary transistors, and wherein the control circuit is configured to, during the soft-start mode, switch the first auxiliary transistor in place of the first switching transistor and switch the second auxiliary transistor in place of a second switching transistor of the plurality of switching transistors.

6. The switched resonant power converter of claim 1, wherein the impedance element is connected in series with a first auxiliary transistor of the one or more auxiliary transistors, and wherein the control circuit is configured to, during the soft-start mode, switch the first auxiliary transistor according to the switching cycle in place of the first switching transistor of the plurality of switching transistors.

7. The switched resonant power converter of claim 6, wherein one or more auxiliary transistors comprises a second auxiliary transistor connected in series with a second impedance element, the second auxiliary transistor and second impedance element providing a second auxiliary circuit path in parallel to a second switching transistor of the plurality of switching transistors, and wherein the control circuit is configured to, during the soft-start mode, switch the second auxiliary transistor in place of a second switching transistor.

8. The switched resonant power converter of claim 1 , wherein the control circuit is configured to periodically switch the plurality of switching transistors according to the switching cycle during a start-up of the switched resonant power converter, and to switch to the operational mode when a threshold power level is detected at an output node of the switched resonant power converter.

9. The switched resonant power converter of claim 8, the switched resonant power converter further comprising:

a transformer circuit;

a rectifier circuit coupled to the resonant circuit via the transformer circuit; and an output capacitor,

wherein the output node is coupled to a load, across the output capacitor.

10. A power system, comprising:

a switched resonant converter, wherein the switched resonant converter comprises: a plurality of switching transistors connected in series;

a resonant circuit comprising a capacitor and an inductor and connected at a first node linking two of the connected plurality of switching transistors;

an auxiliary soft-start bypass circuit, including an impedance element, that bypasses a default switching path and that provides an alternative path to a first switching transistor of the plurality of switching transistors through the impedance element; and a control circuit configured to switch to (1) an operational mode in which the default switching path is periodically activated while the alternative path is deactivated to provide a first frequency-responsive power through the resonant circuit, from (2) a soft- start mode in which the alternative path is periodically activated while the default switching path is deactivated to provide a second frequency-responsive power through the resonant circuit.

11. The power system of claim 10, wherein the impedance element comprises a resistor or an inductor.

12. The power system of claim 11, wherein the resonant circuit is a series resonant circuit, and the capacitor and the inductor of the resonant circuit are connected in series.

13. The power system of claim 11, wherein the resonant circuit is a parallel resonant circuit including two inductors and capacitor.

14. The power system of claim 10, wherein the auxiliary soft-start bypass circuit comprises first and second auxiliary transistors, the control circuit switching the first auxiliary transistor in place of the first switching transistor of the plurality of switching transistors and switching the second auxiliary transistor in place of a second switching transistor of the plurality of switching transistors.

15. The power system of claim 14, wherein the first and second auxiliary transistors are connected in series, and wherein the impedance element is connected between the first node and a second node Unking the first and second switching transistors.

16. The power system of claim 14, wherein the impedance element is connected in series with the first auxiliary transistor, and wherein the auxiliary soft-start bypass circuit further comprises:

a second impedance element in series with the second auxiliary transistor and providing a second circuit path through the second impedance element and parallel to the second switching transistor during the soft-start mode.

17. The power system of claim 10, wherein the control circuit is configured to periodically switch the plurality of switching transistors according to a switching cycle during a start-up of the switched resonant converter, and to switch to the operational mode when a threshold power level is detected at an output node of the switched resonant converter.

18. The power system of claim 17, the switched resonant converter further comprising: a transformer circuit;

a rectifier circuit coupled to the resonant circuit via the transformer circuit; and an output capacitor,

wherein the output node is coupled to a load, across the output capacitor.

19. A switched resonant converter, comprising:

means for establishing a default switching path between a voltage source and a load, to provide a first frequency-responsive power to a load;

means for providing an auxiliary switching path through an impedance element, parallel to a portion of the default switching path, to provide a second frequency-responsive power to a load; and

means for switching between a soft-start mode in which the auxiliary switching path is enabled and the default switching path is disabled, and an operational mode in which the auxiliary switching path is disabled and the default switching path is enabled, the auxiliary switching path being enabled during a start-up of the switched resonant converter, and the default switching path being switched to enabled when an output of the switched resonant converter reaches a threshold power.

20. The switched resonant converter of claim 19, wherein the default switching path comprises a plurality of switching transistors, and wherein the means for providing the auxiliary switching path comprises:

means for switching, during the soft-start mode, a plurality of auxiliary transistors on and off in place of the plurality of switching transistors.