Yes.
You need to choose the resistor values (ohms, watt rating) to discharge the PS caps to a safe level in a reasonable time, but not 'load down' the PS by adding a significant current draw during normal operation.
There are online tools/worksheets for doing the calculation or you can do the math 'from scratch'.
The simplest circuit design is also the easiest to remember: just connect a bleeder resistor directly across the terminals of each electrolytic capacitor.
My own preference is to use flameproof resistors rated for 1 watt, and then choose a resistance value R such that the power dissipated in the resistor will be (1/2) watt or less. So for example if the DC supply voltage is 54 volts, I would choose R >= 5.83K. Namely, 6.2K with 1 watt rating. Personally I don't care whether the bleed-down takes 10 seconds or 120 minutes. Other people may have different opinions about this.
My own preference is to use flameproof resistors rated for 1 watt, and then choose a resistance value R such that the power dissipated in the resistor will be (1/2) watt or less. So for example if the DC supply voltage is 54 volts, I would choose R >= 5.83K. Namely, 6.2K with 1 watt rating. Personally I don't care whether the bleed-down takes 10 seconds or 120 minutes. Other people may have different opinions about this.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.