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Charger Supply

August 15th, 2007

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Digital Charger Supply Improve the Power Efficiency

Many applications today, such as internal power supplies for PCs, may operate in light-load conditionsjust as frequently as in heavy load conditions. Due to these wide load variations,
Digital Charger
power supplies often aren’t optimized for light loads and, as a result, are less efficient.

With the recent push for “green energy,” power-supply designers have been challenged to improve the efficiency of their power supplies. One challenge has been to improve the efficiency at low-load conditions while still maintaining high efficiency at large loads.

To improve efficiency in switch-mode-power-supply (SMPS) applications, we first need to understand the fundamental losses within a power-supply application.

In synchronous buck converter applications, the majority of the losses in the system occur in the MOSFET conduction and switching losses. SMPS applications with high switching frequencies will endure higher switching losses, as the switching losses increase with switching frequency.

Multiphase synchronous buck converters are often used to increase the power handling of a step-down voltage stage. Multiple converters in parallel increase performance while reducing the output ripple current and allowing the use of smaller components. However, at light loads, having multiple converters switching may decrease the efficiency of the system.

When operating at low current,
Battery Charger
may not be necessary to have all converters operating simultaneously. Depending on the load current, multiple converters can be disabled, eliminating MOSFET switching and conduction losses for each stage. As the output-load current increases, individual converter stages can be enabled to handle the output-load current.

The idea is to measure the output-load current and compare it to a threshold value, which will determine when to disable/enable individual buck-converter stages. At this point, the PWM drive signals will need to be asserted/deasserted, depending on the load current.

A similar technique can be applied to a single-phase buck converter. The synchronous-buck MOSFET Q2 can be disabled/enabled when the measured output current crosses a threshold. As the load current is light, by disabling MOSFET Q2, conduction and switching losses will be eliminated while dynamic response and output voltage will not be affected. This technique works in the range from no-load conditions to the maximum current ratings of the synchronous diode D1.

In both cases, having full control of the PWM drive signals is essential. The PWM module should allow some
Camera Battery Charger
drive signals to remain active while other drive signals are in an override state (disabled).

Figure 2 demonstrates the power savings as a percentage gained when implementing these techniques. The top graph shows the results of the synchronous buck converter testing. The converter tested was designed for 23 A at 3.3 V. The bottom graph shows the results of testing a multiphase synchronous buck application designed for 69 A at 3.3 V.

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