Battery and adapter Switching Circuit Improvement Experiment (RPM)

Source: Battery and Adapter switching Circuit improvement experiment

Objective: Many single-cell machines in the case of large load, such as the backlight on the brightest, running 3D games, at this time to unplug DC power is prone to machine crashes, or flower screen phenomenon;

Reason: Q5 time is not enough, hope that through the rapid discharge of G-pole, speed to the on-time;

Before modifying the circuit:

(When the battery voltage is 3.65V switch, yellow means VB, green MOS G-pole) running 3D game, unplug the charging power, MOS tube to turn on the status of 32ms or so, VB drop for 725mV.

(When the battery voltage is 3.4V, the yellow is VB, the green MoS G-pole) when running 3D game, unplug the charging power, the MoS tube to the conduction state to be about 11ms, VB drop for 970mV, the system restarts.

After modification:

(When the battery voltage is 3.65V switch, yellow means VB, green MOS G-pole) running 3D game, unplug the charging power, MOS tube to turn on the status of 0.16ms or so, VB drop for 200mV.

(When the battery voltage is 3.4V, the yellow is VB, the green MoS G-pole) when running 3D game, unplug the charging power, the MoS tube to turn on the state to be about 0.16ms, VB basically no drop, the system does not restart.

conclusion: from the above experiment, it can be seen that the modified circuit can make the MoS tube self-junction capacitance more quickly when the charger is removed, and the MoS tube will be faster. The problem of unplug the charging power when the single battery is low pressure can be solved very well.

Battery and adapter Switching Circuit Improvement Experiment (RPM)