100 uF will make the reaction time to be around 100ms, and 1n will make it 1us. The Capacitor C4 will determine the velocity or the reaction time of the limiter. The diagram 2 will show that for 5 Amps the Uz1 should be 5V6, and for 20Amps around 9V6. The Z1 voltage (Uz1) will thus determine the max current flowing through the FET 1. So the maximum Gate voltage will be the one of the Z1, and the minimal will be around 3V6. However, to enable the FET1 to open, there is certain gate voltage necessary, which in this case is brought up by the voltage divider consisting of R8, Z1, P1 and R9. When the voltage rises enough, the Q4 will shortcut the FET1 gate to mass, and cut the current flow through the FET 1 off. The D2, R3 and B-E connection of the Q4 will sense the Uds voltage of the FET1. This means, that before the knick the FET behaves as a resistor but after it, works as constant current source. When the current Id is rising, the tension Uds over the resistance Rds rises very slowly in the beginning, but very fast after the knick. The function of the FET is shown in the diagram 2. But it is really there, in a form of the Rds-on resistance of the N-channel FET, which actually handles the load cutoff from the source. You will notice that there is no current sensing resistor. There is an adjustable current limiter in parallel to the fixed output, thus providing adjustable current source for smaller currents. The LED 2 will light up every time the PSU is switched on. This makes it possible to run the IC1 without any cooling aid. Therefore the R4 is inserted, as to limit the IC1 current to 15mA.
CANON IP3000 POWER SUPPLY FULL
When the fuse is active, the Q2 bridges the R3, so the full current would flow through the IC1, and damage it. Parallel to Q2 is Q1, which lights the LED 1 whenever the current limiting circuit is active. As soon as the maximum current reaches 20Amps, the voltage drop over the resistor RL will open Q2, and thus limit the B-E Current of Q3. The RL and Q2 (3A PNP such as BD330) form a short circuit automatic fuse. Values for other currents can be calculated by the rule: You can use the resistance wire or switch several resistors in parallel, totaling the resistance/power values. The current limiting resistance RL, for the maximum output of 20 Amps should be 0.03 Ohms, rated at least 15W. The one that has been tested and proven here is the 2N5683. This is a PNP transistor (Ic>25) and current amplification factor of at least 20. As soon as the current rises over 15ma, the voltage drop on R4 will open the Q3, actually handling the high output current. The low currents (here 15mA) will keep the 7812 in its regular function. The output voltage can be brought to desired value (here 13.8V) by two external resistors (R5 and R6) using this formula: The base of this design is a simple 12V regulator (7812). This capacity can be built up by several smaller capacitors in parallel. The rectified current will be ironed by the C1, whose capacity should not be less than 40.000uF, (a golden rule of around 2000uF/A), but we recommend up to 50.000uF. The lower the voltage, the lower power dissipation. The power transformer should be capable to deliver at least 25A at 17.5 to 20V. For lower currents, a separate current limiting output, capable of 15ma up to a total of 20A has been added. It delivers safely around 20Amps at 13.8V. This PSU has been especially designed for current-hungry ham radio transceivers. No Matter you're replacing a defective or lost power supply or simply purchasing one to go with a product that needs power, (Full range input, Dual output).Regulated DC power supply, short circuit safe, and with current limiter. It's important to buy the correct Power Supply for your device. Information's are here for your reference only and accuracy can not be guaranteed. Genuine Canon K30350 Power Adapter Pixma Mx922 Output: 32vdc 0.95A, dc 24V = 0.33AĬonnector: 5 pin rectangle white flat 1 5Ĭonnector size: OD 15 x 4 mm Manufacturer: CANON / AcBel Electronics / Dongguan Co. CANON K30350 POWER SUPPLY 32v 0.95A 24Vdc 0.33A 3Pin USED inkjet PRINTER same as K30351Īctually it is brand new removed from new printer that never been used
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