Parallel power supply system with over-voltage protection circuit
AssigneeDelta Electronics, Inc.
InventorKuei-Hsiang Tsai
Life of this patent
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Abstract
A parallel power supply system with an over-voltage protection circuit is provided. The parallel power supply system includes two power supplies which are paralleled for providing a stable DC output voltage, two isolated diode electrically, each of which is coupled between an output of each power supply and the DC output voltage for isolating outputs of the power supplies and the DC output voltage respectively, two voltage feedback controllers, each of which feeds back an output voltage of each power supply to control output voltages of power supplies at a predetermined value respectively, two resistors, and two bypass diodes used for forming a bypass connection which operates during the over-voltage outputting period.
Claims7
A parallel power supply system with an over-voltage protection circuit for providing a stable DC output voltage, comprising:
- a first power supply having a first output terminal for providing a first DC output voltage and a first ground terminal electrically connected to ground;
- a second power supply having a second output terminal for providing a second DC output voltage and a second ground terminal electrically connected to ground;
- a first diode having an anode end electrically connected to said first output terminal of said first power supply;
- a second diode having an anode end electrically connected to said second output terminal of said second power supply, and a cathode end electrically connected to a cathode end of said first diode for forming a node which is an output of said parallel power supply system;
- a first voltage feedback controller electrically connected to said first DC output voltage for providing a first control signal to control said first DC output voltage of said first power supply at a predetermined value;
- a second voltage feedback controller electrically connected to said second DC output voltage for providing a second control signal to control said second DC output voltage of said second power supply at said predetermined value;
- a first resistor having one end electrically connected to said node and the other end electrically connected to an input terminal of said first voltage feedback controller;
- a second resistor having one end electrically connected to said node and the other end electrically connected to an input terminal of said second voltage feedback controller;
- a third diode having an anode end electrically connected to said input terminal of said first voltage feedback controller and a cathode end electrically connected to said first output terminal of said first power supply;
- and
- a fourth diode having an anode end electrically connected to said input terminal of said second voltage feedback controller and a cathode end electrically connected to said second output terminal of said first power supply,
- wherein said first DC output voltage turns on said fourth diode for maintaining said DC output voltage of said parallel power supply system at said predetermined value when said first DC output voltage is greater than said predetermined value, and said second DC output voltage turns on said third diode for maintaining said DC output voltage of said parallel power supply system at said predetermined value when said second DC output voltage is greater than said predetermined value.
Dependencies are inferred from the claim text.