Difference between revisions of "IONI power supply schemes"
From Granite Devices Knowledge Wiki
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*Availability of parts | *Availability of parts | ||
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*Switching PSUs typically don't allow temporary overloading | *Switching PSUs typically don't allow temporary overloading | ||
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| [[File:ioni_spu_scheme2.png|300px]]|| Two similar high power supplies are used to supply both motor and logic voltages. In this system power of PSU1 and PSU2 will contribute to motor supply, i.e. if both supplies are rated 200W, then total power available to drives is ~400W. Diodes D1 is needed to protect power supplies from regenerative power and D2/D3 to protect power supplies in the case where one power supply would shut down (i.e. on overload). For recommended diodes, see the paragraph below.|| | | [[File:ioni_spu_scheme2.png|300px]]|| Two similar high power supplies are used to supply both motor and logic voltages. In this system power of PSU1 and PSU2 will contribute to motor supply, i.e. if both supplies are rated 200W, then total power available to drives is ~400W. Diodes D1 is needed to protect power supplies from regenerative power and D2/D3 to protect power supplies in the case where one power supply would shut down (i.e. on overload). For recommended diodes, see the paragraph below.|| | ||
| − | *Cost saving (i.e. 2x200W 24V | + | *Cost saving (i.e. 2x200W 24V cost less than a 1x400W 48V) |
*Compact | *Compact | ||
*Availability of parts | *Availability of parts | ||
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| − | *In | + | *In case of PSU2 fault/overload, drive 24V logic supply voltage may be instabilized (erratic drive behavior, or resetting drive) |
*Switching PSUs typically don't allow temporary overloading | *Switching PSUs typically don't allow temporary overloading | ||
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Revision as of 19:16, 3 December 2015
| Scheme | Description | Pros | Cons |
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Two switching power supplies, one high power voltage supply for motor and one low power supply for logic circuity. A diode D1 is necessary to protect regenerative current flow going back to PSU1. For recommended diodes, see paragraph below. |
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Two similar high power supplies are used to supply both motor and logic voltages. In this system power of PSU1 and PSU2 will contribute to motor supply, i.e. if both supplies are rated 200W, then total power available to drives is ~400W. Diodes D1 is needed to protect power supplies from regenerative power and D2/D3 to protect power supplies in the case where one power supply would shut down (i.e. on overload). For recommended diodes, see the paragraph below. |
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Linear (transformer based unregulated) power supply is used for motor supply and low power switching PSU for logic power. |
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Diodes D1-D3 are typical silicon or schottky rectifier diodes that are sufficiently rated to carry the present voltages and currents. As diodes are inexpensive, there is no need to avoid oversizing them. Examples diodes:
- Diodes Inc. 10A02-T (10A 100V, leaded)
- Diodes Inc. 10A04-T (10A 400V, leaded)
- Fairchild FFPF30UP20STU (30A, 200V, leaded, isolated TO-220 case)
- Fairchild RURG3060 (30A 600V, leaded, non-isolated case - cooling tab is either anode or cathode)
- Fairchild STPS20120D (20A 120V, leaded, non-isolated case - cooling tab is either anode or cathode)
