| 摘要 |
<p>A switching DC-DC converter having a switching circuit to convert an input voltage to an output voltage, such as a buck converter, has a control loop to control the switching circuit which can attempt to maintain the output voltage at a preset level. The control loop includes an auto zero loop to modify a feedback gain to reduce error in the control loop. The loss in the switching circuit is estimated from the value of the feedback gain. The estimated loss can be a power loss, a current loss or a voltage loss and be used to calculate input power and to select the most efficient mode of operation, such as the mode of phase operation including the optimum point for switchover between a single phase mode or dual phase mode in a two phase DC-DC power supply. The loss can also be used to tune an operating characteristic such as switching frequency and the degree of overlap between complementary switches; and be sent to an external device, possibly to control the voltage on a supply bus supplying an input voltage to the converter. DC-DC converter power losses can be calculated without a measurement of input current.</p> |
