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Disclosed is a supplementary power circuit fort with a multiple power supply system.
English (United States)
This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately
81% of the total text.
Supplementary Power Circuit in a Multiple Power Supply
a supplementary power circuit fort with a multiple
power supply system.
In a multiple
power supply system, a start-up timing of each
Direct Current/Direct Current (DC/DC) converter is not the same, so
that there is a time difference between each output voltage. Such a
difference might cause some problems or bring electrical stress to
devices in a power supplied system. With
the present supplementary
power circuit, each output voltage appears at the same time even if
the DC/DC converter's start-up timing is different.
shows the multiple power supply system having the
present supplementary power circuit. The
system is composed of a
Micro Processing Unit (MPU), 3.3V DC/DC converter, 2.5V DC/DC
converter and the supplementary power circuit.
At the power-ON time,
the 2.5V DC/DC converter outputs Vcc2 after the 3.3V DC/DC converter
outputs Vcc1, because the input of the 2.5V DC/DC converter is the
output of the 3.3V DC/DC converter. But,
at the time, 2.5V (Vcc2) is
supplied by the supplementary circuit.
The operation is as follows:
When the 3.3V DC/DC converter starts up, Vcc2 is supplied through Q1
and D1 because Q2 becomes ON at the time.
After the predetermined
time by C1 and R3, Q3 becomes OFF and Q1 becomes OFF. This
predetermined time is defined longer than the start-up delay time of
the 2.5V DC/DC converter. After the
predetermined time, V...