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US 10,103,637 B2Granted
Power converter for a switching power supply and manner of operation thereof
AssigneeChampion Microelectronic Corp.
InventorJeffrey Hwang
Life of this patent
Estimating the term…
Abstract
A switching power supply comprises a power converter that includes a transformer, a low side switch and a high side switch. The low side switch draws current from a supply voltage through a primary winding of the transformer. The high side switch discharges current from the primary winding of the transformer to a snubber capacitor. The controller synchronously controls the opening and closing of the low side switch and the high side switch. The power converter can be included in a flyback converter. The power converter can generate a regulated output voltage.
Claims53
A switching power supply comprising:
- a power converter having a transformer, a low side switch configured to draw current from a supply voltage through a primary winding of the transformer and a high side switch configured to discharge current from the primary winding of the transformer to a snubber capacitor;
- and
- a controller configured to synchronously control opening and closing of the low side switch and the high side switch, wherein the low side switch and the high side switch are each repeatedly opened and closed so as to form a regulated output voltage in a feedback loop, the regulated output voltage being formed from a current induced in a secondary winding of the transformer, and wherein the controller is configured to adjust a time instant of closing the high side switch within each switching cycle upon detection of a one or more of a load condition or a supply voltage condition.
A switching power supply comprising:
- a power converter having a transformer, a low side switch configured to draw current from a supply voltage through a primary winding of the transformer and a high side switch configured to discharge current from the primary winding of the transformer to a snubber capacitor;
- and
- a controller configured to synchronously control the opening and closing of the low side switch and the high side switch, wherein the low side switch and the high side switch are each repeatedly opened and closed so as to form a regulated output voltage, the regulated output voltage being formed from a current induced in a secondary winding of the transformer, and wherein the controller is configured to selectively operate in:
- (1) a frequency control mode in which frequency of switching is controlled in a frequency control mode feedback loop to regulate the regulated output voltage;
- and (2) a current control mode in which peak current in the primary winding of the transformer for each switch cycle is controlled in a current control mode feedback loop for regulating the regulated output voltage, wherein the controller operates in the frequency control mode upon detection of a supply voltage condition.
2 more elements
A switching power supply comprising:
- a power converter having a transformer, a low side switch configured to draw current from a supply voltage through a primary winding of the transformer and a high side switch configured to discharge current from the primary winding of the transformer to a snubber capacitor;
- and
- a controller configured to synchronously control opening and closing of the low side switch and the high side switch, wherein the low side switch and the high side switch are each repeatedly opened and closed so as to form a regulated output voltage, the regulated output voltage being formed from a current induced in a secondary winding of the transformer, and wherein the controller is configured to selectively control opening and closing of the low side switch in:
- (1) a frequency control mode in which frequency of switching is controlled in a frequency control mode feedback loop to regulate the regulated output voltage;
- and (2) a current control mode in which peak current in the primary winding of the transformer for each switch cycle is controlled in a current control mode feedback loop for regulating the regulated output voltage, and wherein the controller is configured to adjust a time instant of closing the high side switch within each switching cycle upon detection of a one or more of a load condition or a supply voltage condition.
2 more elements
Dependencies are inferred from the claim text.