Power supply with standby power
Methods, systems, and devices are described for auxiliary power with low standby power consumption. Switching power converters typically include a switching power element (e.g., a power transistor), driven by a switching controller (e.g., including a gate driver). The power output of the switching power converter may be a function of the switching signal provided by the switching controller. For example, a pulse-width modulated (“PWM”) signal may be used to drive the switching power element, and the output of the switching controller may be adjusted by adjusting the frequency and/or duty cycle of the PWM signal. Embodiments implement cycle extension techniques to effectively extend a portion of the PWM signal to generate additional charge. The additional charge may be used to power an auxiliary power unit. The auxiliary power unit may then be used to drive the switching controller and/or to provide a source of power for other internal or external components.
1. A power supply, comprising:
a switching controller module, operable to generate a load switching signal and an auxiliary switching signal, wherein:
the load switching signal comprises pulses, each pulse of the load switching signal having a pulse width defining a charging duration, a first portion of the charging duration being defined as a function of an operational load power and a second portion of the charging duration being defined as a function of an operational auxiliary power; and
the auxiliary switching signal comprises pulses, each pulse of the auxiliary switching signal having a pulse width defined by the second portion of the charging duration;
a load power module, communicatively coupled with the switching controller module, and operable to generate output load power as a function of an input power signal and the load switching signal, such that the output load power is generated during the first portion of the charging duration; and
an auxiliary power module, communicatively coupled with the switching controller module, and operable to generate output auxiliary power as a function of the input power signal, the load switching signal, and the auxiliary switching signal, such that the output auxiliary power is generated during the second portion of the charging duration.
2. The power supply of claim 1 , wherein:
the switching controller module is configured to be powered by a source voltage level within an operating range; and
the auxiliary power module is further operable to maintain the source voltage substantially within the operating range.
3. The power supply of claim 1 , further comprising:
a load power feedback module, operable to:
monitor the output load power; and
adjust the pulse width of at least some of the pulses of the load switching signal to maintain the output load power substantially at the operational load power.
4. The power supply of claim 1 , further comprising:
a load power feedback module, operable to:
monitor the output load power; and
adjust the frequency of the load switching signal to maintain the output load power substantially at the operational load power.
5. The power supply of claim 1 , further comprising:
an auxiliary power feedback module, operable to:
monitor the output auxiliary power; and
adjust the pulse width of at least some of the pulses of the auxiliary switching signal to maintain the output auxiliary power substantially at the operational auxiliary power.
6. The power supply of claim 1 , further comprising:
a regulator module, comprising a high-power regulator device operable to generate a regulated source voltage as a function of the input power signal,
wherein the load power module comprises a low-power switching device in series with the high-power regulator device.
7. The power supply of claim 6 , wherein:
the high-power regulator device is switched as a function of the auxiliary switching signal and the low-power switching device is switched as a function of the load switching signal, such that charging current is routed to the auxiliary power module through the high-power regulator device during the second portion of the charging duration.
8. The power supply of claim 7 , wherein:
the regulator module further comprises a current limiting device;
the auxiliary power module further comprises a switched current path substantially in parallel to the current limiting device and is configured so that current is routed through the current limiting device when the switched current path is switched off and current is routed through the switched current path when the switched current path is switched on,
wherein the switched current path and the high-power regulator device are switched substantially synchronously as a function of the auxiliary switching signal so that charging current routed to the auxiliary power module during the second portion of the charging duration is routed through the switched current path.
9. The power supply of claim 6 , further comprising:
an integrated circuit comprising the switching controller module and the load power module.
10. The power supply of claim 1 , further comprising:
a regulator module, operable to generate a regulated source voltage as a function of the input power signal,
wherein the switching controller module is configured to operate in a first mode and a second mode, such that the switching controller module generates the load switching signal only in the second mode, and the switching controller module is powered by the regulated source voltage only in the first mode.
11. The power supply of claim 10 , wherein:
the switching controller module is further configured to switch from the first mode to the second mode upon receipt of an enable signal.
12. The power supply of claim 1 ,
wherein the load power module comprises a boost converter.
13. A power supply, comprising:
means for generating a load switching signal comprising pulses, each pulse of the load switching signal having a pulse width defining a charging duration, a first portion of the charging duration being defined as a function of an operational load power and a second portion of the charging duration being defined as a function of an operational auxiliary power;
means for generating an auxiliary switching signal comprising pulses, each pulse of the auxiliary switching signal having a pulse width defined by the second portion of the charging duration;
means for generating output load power during the first portion of the charging duration as a function of an input power signal and the load switching signal; and
means for generating output auxiliary power during the second portion of the charging duration as a function of the input power signal, the load switching signal, and the auxiliary switching signal.
14. The power supply of claim 13 , further comprising:
means for powering the means for generating the load switching signal by converting output auxiliary power to a source voltage applied to the means for generating the load switching signal.
15. The power supply of claim 13 , further comprising:
means for monitoring the output load power; and
means for adjusting the pulse width of at least some of the pulses of the load switching signal to maintain the output load power substantially at the operational load power.
16. The power supply of claim 13 , further comprising:
means for monitoring the output load power; and
means for adjusting the frequency of the load switching signal to maintain the output load power substantially at the operational load power.
17. The power supply of claim 13 , further comprising:
means for monitoring the output auxiliary power; and
means for adjusting the pulse width of at least some of the pulses of the auxiliary switching signal to maintain the output auxiliary power substantially at the operational auxiliary power.
18. The power supply of claim 13 , further comprising:
means for integratedly housing at least the means for generating the load switching signal and the means for generating output load power.
19. The power supply of claim 13 , further comprising:
means for housing at least the means for generating the load switching signal, the means for generating the auxiliary switching signal.
20. A method for supplying power, comprising:
generating a charging cycle for a power converter module, the charging cycle having a charging duration;
charging a first power subsystem during a first portion of the charging duration using the power converter module;
charging a second power subsystem during a second portion of the charging duration using the power converter module;
outputting an output load power using the first power subsystem;
outputting an output auxiliary power using the second power subsystem;
determining an operational load power and an operational auxiliary power;
regulating a duration of the first portion of the charging duration as a function of the operational load power; and
regulating a duration of the second portion of the charging duration as a function of the operational auxiliary power,
wherein the charging duration is substantially the sum of the duration of the first portion and the duration of the second portion.
21. The method of claim 20 , wherein generating the charging cycle for the power converter module comprises:
generating a load switching signal comprising pulses, each pulse of the load switching signal having a pulse width defining the charging duration; and
generating an auxiliary switching signal comprising pulses, each pulse of the auxiliary switching signal having a pulse width defined by the second portion of the charging duration.
22. The method of claim 21 , further comprising:
determining an operational load power;
monitoring the output load power with respect to the operational load power; and
adjusting the pulse width of at least some of the pulses of the load switching signal to maintain the output load power substantially at the operational load power.
23. The method of claim 21 , further comprising:
determining an operational load power;
monitoring the output load power with respect to the operational load power; and
adjusting the frequency of the load switching signal to maintain the output load power substantially at the operational load power.
24. The method of claim 21 , further comprising:
determining an operational auxiliary power;
monitoring the output auxiliary power with respect to the operational auxiliary power; and
adjusting the pulse width of at least some of the pulses of the auxiliary switching signal to maintain the output auxiliary power substantially at the operational auxiliary power.
25. The method of claim 20 , further comprising:
converting at least a portion of the output auxiliary power to a regulated source voltage,
wherein generating the charging cycle for the power converter module comprises using a charging cycle generator to generate the charging cycle, and tale charging cycle generator is powered by the regulated source voltage.