Hybrid control technique for power converters
AssigneeSemiconductor Components Industries, LLC
InventorRoman STULER
Life of this patent
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Abstract
A power conversion circuit includes a high-side MOSFET and a low-side MOSFET. A conduction terminal of the high-side MOSFET is coupled to a conduction terminal of the low-side MOSFET at a half-bridge (HB) circuit node. The high-side MOSFET is switched off. Voltage potential transitions of the HB circuit node are counted while the high-side MOSFET and low-side MOSFET are off. Assertion of a control signal to the low-side MOSFET is postponed for two voltage potential transitions of the HB circuit node after the high-side MOSFET is switched off. The low-side MOSFET is switched off by de-asserting the control signal to the low-side MOSFET. Switching on the high-side MOSFET is postponed for two voltage potential transitions of the HB circuit node after switching off the low-side MOSFET.
Claims20
A method of generating a voltage signal, comprising:
- providing a power conversion circuit including a high-side MOSFET and a low-side MOSFET, wherein a conduction terminal of the high-side MOSFET is coupled to a conduction terminal of the low-side MOSFET at a half-bridge (HB) circuit node;
- switching off the high-side MOSFET;
- counting voltage potential transitions of the HB circuit node while the high-side MOSFET and low-side MOSFET are off;
- and
- postponing assertion of a control signal to the low-side MOSFET for two voltage potential transitions of the HB circuit node after switching off the high-side MOSFET.
A method of generating a power signal, comprising:
- providing a power conversion circuit including a first switch coupled to a second switch at a half-bridge (HB) circuit node;
- detecting voltage potential transitions of the HB circuit node;
- and
- counting peaks or valleys of the HB circuit node based on the voltage potential transitions while the first switch and second switch remain off.
A power conversion circuit, comprising:
- a first switch including a conduction terminal and a control terminal;
- a second switch including a conduction terminal of the second switch coupled to the conduction terminal of the first switch;
- a dV/dt sensor coupled to the conduction terminal of the first switch;
- and
- a valley/peak detection and lockout block including an input coupled to an output of the dV/dt sensor and an output of the valley/peak detection and lockout block configured to delay assertion of a control signal to the control terminal of the first switch.
Dependencies are inferred from the claim text.