I want to increase rail voltage by 4 to 5 volts... I have added picture of the PWM IC.
Current rail voltage is +-28v, capacitors are 35v. So I want to increase voltage to 31v to 33v by changing the duty cycle of TL494
Amplifier is ADS p440
Current rail voltage is +-28v, capacitors are 35v. So I want to increase voltage to 31v to 33v by changing the duty cycle of TL494
Amplifier is ADS p440
Does it have a reduced duty cycle as of now?
If so, DCV on pins 1, 2, 15 and 16? Black probe on pin 7.
If so, DCV on pins 1, 2, 15 and 16? Black probe on pin 7.
Isn't the rail voltage set by the ratio of the primary to secondary windings at the transformer ??!?!
The PWM controller for car audio amp power converter could be designed in three ways:
1) without any regulation (why not, it's cheap))
2) with output limit for abnormal power (>15V),
3) with regulation in working range (e.g.11V-15V).
For cases 1) and 2) it runs on maximum duty cycle when input power is within normal range and rails voltage are defined by transformer.
Only the last case allows you to increase rails voltage by changing the voltage sense divider.
You can figure out your case by using lab supply, change input power from 10V to 15V and check if (and how) rails voltage changes.
1) without any regulation (why not, it's cheap))
2) with output limit for abnormal power (>15V),
3) with regulation in working range (e.g.11V-15V).
For cases 1) and 2) it runs on maximum duty cycle when input power is within normal range and rails voltage are defined by transformer.
Only the last case allows you to increase rails voltage by changing the voltage sense divider.
You can figure out your case by using lab supply, change input power from 10V to 15V and check if (and how) rails voltage changes.