Integrated thermal and power control
A switching power regulator provides for power regulation for a load, based at least in part on comparison of an output voltage with a reference voltage. The reference voltage may be changed, and in some cases changed dynamically, while regulated power is provided to the load. The switching power regulator may include a bypass switch for coupling ends of an output inductor.
1. A power regulation system, comprising:
a controller configured to control power delivery to a load by controlling states of a first switch, second switch, and third switch of a power converter based on a voltage control signal, the first switch coupled across an output inductor, the second switch and third switch coupled in series between a higher voltage source and a lower voltage source, with one end of the output inductor coupled to a node between the second switch and the third switch and another end of the output inductor coupled to one end of an output capacitor;
a power control unit configured to adjust, including during operation of the first, second, and third switches, a reference voltage signal based on information from a temperature sensor;
a first comparator configured to produce the voltage control signal based on comparison of the reference voltage signal and a signal indicative of an output voltage of the output inductor; and
wherein the power control unit is configured to adjust the reference voltage signal based on information from the temperature sensor while the controller controls power delivery to the load; and
wherein the controller controls power delivery to the load by at least adjusting a duty cycle of the second and third switches;
wherein reference voltages are stored in a plurality of lookup tables, and the power control unit is configured to use the information from the temperature sensor to adjust the reference voltage signal by selecting a reference voltage from different lookup tables depending on whether power optimization or speed optimization is requested.
2. The power regulation system of claim 1 , further comprising a second comparator configured to produce an over current protection (OCP) signal based on comparison of an indication of inductor current of the output inductor and a predefined inductor current.
3. The power regulation system of claim 2 , wherein the controller is further configured to control states of the first switch, second switch, and third switch in response to the OCP signal and a second voltage control signal.
4. The power regulation system of claim 1 , wherein another end of the output capacitor is coupled to the lower voltage source.