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US 9,520,795 B2Granted
Method of forming a power supply controller and structure therefor
AssigneeSemiconductor Components Industries, LLC
InventorsRoman Stuler, Vaclav Drda
Life of this patent
Estimating the term…
Abstract
In one embodiment, a power supply controller may be configured to form a status signal that is representative of a secondary current by substantially removing a primary magnetization component from a primary current signal and to use the status signal to form a first signal that is representative of a delivered output power, and configured to adjust an on-time of one of a first or second switch responsively to the delivered output power.
Claims20
A power supply controller comprising:
- a control circuit configured to form at least one switching control signal to control first and second switches to form a primary current through a resonant circuit to regulate an output voltage to a load from an input voltage and form a load current for the load wherein the first switch is enabled to supply current from the input voltage;
- a first circuit configured to receive a first signal that is representative of a value of the primary current and to receive a second signal that is representative of a value of the input voltage and responsively form a control signal having a value that is proportional to a delivered output power;
- a feedback circuit configured to receive a signal that is representative of the output voltage and form a feedback signal that is representative of the output voltage;
- a first compensation circuit configured to form a third signal that is proportional to a value that the input voltage has during at least a portion of a time that the first switch is enabled and to use the third signal to decrease a value of the feedback signal proportional to the input voltage wherein the decrease is performed in response to enabling the first switch;
- the power supply controller configured to adjust one of the first signal proportionally to the control signal to form a compensated current sense signal or to adjust the feedback signal proportionally to the control signal to form a compensated feedback signal;
- and
- the control circuit configured to terminate an ON-time of the first switch responsively to one of the compensated current sense signal approximately equaling the feedback signal or the compensated feedback signal approximately equaling the first signal.
4 more elements
A power supply controller comprising:
- a control circuit configured to form at least one switching control signal to control first and second switches to form a primary current through a resonant circuit to regulate an output voltage to a load from an input voltage and form a load current for the load;
- a first circuit configured to receive a first signal that is representative of a value of the primary current and to receive a second signal that is representative of the input voltage and responsively form a control signal having a value that is proportional to a delivered output power, the first circuit including a load circuit that is configured to form a load status signal, the load circuit having a derivation circuit that forms a derivative signal that is representative of a derivative of the first signal;
- a feedback circuit configured to receive a signal that is representative of the output voltage and form a feedback signal that is representative of the output voltage;
- a first compensation circuit configured to decrease a value of the feedback signal proportional to a value of the input voltage responsively to enabling the first switch;
- the power supply controller configured to adjust one of the first signal proportionally to the control signal to form a compensated current sense signal or to adjust the feedback signal proportionally to the control signal to form a compensated feedback signal;
- and
- the control circuit configured to terminate an ON-time of the first switch responsively to one of the compensated current sense signal approximately equaling the feedback signal or the compensated feedback signal approximately equaling the first signal.
4 more elements
A method of forming a power supply controller comprising:
- configuring the power supply controller to form at least one switching control signal to control first and second switches to form a primary current through a resonant circuit to regulate an output voltage to a load from an input voltage and form a load current for the load;
- configuring the power supply controller to receive a feedback signal that is representative of the output voltage;
- configuring a first circuit to receive a first signal that is representative of the primary current and form a status signal that is representative of the secondary current by substantially removing a primary magnetization component of the primary current, wherein the removing is performed only during an on-time of the first switch;
- configuring a second circuit to receive the first signal, the status signal, and a signal representative of a value of the input voltage and responsively form a control signal having a value that is proportional to a delivered output power, wherein the power supply controller is configured to form a compensated current sense signal by adjusting the first signal proportionally to the control signal;
- and
- configuring the power supply controller to use the compensated current sense signal to adjust an on-time of the first switch.
3 more elements
A method of forming a power supply controller comprising:
- configuring the power supply controller to form at least one switching control signal to control first and second switches to form a primary current through a resonant circuit to regulate an output voltage to a load from an input voltage and form a load current for the load;
- configuring the power supply controller to form a signal that is representative of the output voltage;
- configuring the power supply controller to form a status signal that is representative of the secondary current by substantially removing a primary magnetization component of the primary current, wherein the removing is performed only during an on-time of the first switch;
- configuring the power supply controller to use the status signal to form a first signal that is representative of a delivered output power;
- and
- configuring the power supply controller to adjust an on-time of one of the first or second switches responsively to the delivered output power.
3 more elements
Dependencies are inferred from the claim text.