Transient Suppression with Lossless Steady State Operation

摘要

A power supply efficiently suppresses transient voltages by storing the maximum charge expected in the transient and releasing it during the transient event at a rate in an equal but opposite amount to the transient, preventing the battery voltage from collapsing. The described power supply provides improved efficiency compared to conventional architectures for transient suppression, thus increasing the length of time between battery charges and creating a better user experience.

主权项

1. A load transient suppression circuit coupled to a battery voltage providing power to an electronic device, the load transient suppression circuit comprising:
an operational amplifier to receive a bias current via a bias input during a transient load condition and to provide an output current during the transient load condition; a bias capacitor coupled to the bias input of the operational amplifier, the bias capacitor to discharge during the transient load condition to supply the bias current; an output capacitor coupled between an output of the operational amplifier and the battery voltage, the output capacitor to provide a discharge current to the electronic device during the transient load condition to prevent the battery voltage from dropping below a threshold voltage; and a operational amplifier input circuit to provide a first voltage to a positive input terminal of the operational amplifier and to provide a second voltage to a negative input terminal of the operational amplifier, wherein the second voltage is greater than the first voltage during nominal load condition and wherein the second voltage drops below the first voltage in response to the transient load condition to cause the operational amplifier to provide the output current during the transient load condition.