Variable Pulse Frequency Generator (70)

Circuit (70) of Figure (3-5) is a multi pulse-frequency generator which produces several clock
 pulses (simultaneously)simultaneously) having different pulse-frequency but maintaining a 50% duty cycle pulse (39)
 configuration, as illustrated in Figure (3-16).

Figure (3-5)

Figure (3-16)

Pulse on-time (37) and pulse off-time (38) are equally
 displaced to form duty pulse (39) which is duplicated in succession to produce pulse train (41) of Figure
 (3-16).

Increasing the number of duty pulses (39axxx39a xxx 39n) up to pulse frequency range of 10Khz or
 above now forms clock signal (21) of Figure (3-5) which, in turns, performs the scanning function of
 Acceleration Control Circuit (30) of Figure (3-5).

Circuit (70) also produces another independent and
 separate clock signal (41a xxx 41n) which is electrically transmitted to and become incoming clock
 signal (42) for Gated Pulse Frequency Generator Circuit (80) of Figure (3-5).

In both cases, pulse
 frequency range of each clock signal (21) and (42) can be altered or change (controlled independent of
 each other) to obtain peak:peak performance of Fuel Cell System (100) of Figure (3-5).