Power supply circuit with standby arrangement
First Claim
1. A power supply circuit comprising:
- an input terminal and a reference terminal for connection of a direct voltage source to the input terminal and the reference terminal means for connection of a load to an output terminal and the reference terminal, a series arrangement of an inductive element and a diode connected to one another at a first node with the inductive element connected between the input terminal and the first node and the diode being connected between the first node and the output terminal, a first electronic switch having a main current path connected between the first node and the reference terminal, and a drive circuit for periodically making the main current path of the first electronic switch conductive and non-conductive, characterized in that the drive circuit comprises a first switching device for making the main current path of the first electronic switch permanently non-conductive in response to a standby signal, and a second electronic switch having a control electrode, and a first and a second main electrode which constitute a main current path connected in parallel with at least the diode of the series arrangement of the inductive element and the diode, and a second switching device for making the main current path of the second electronic switch permanently conductive in response to the standby signal.
1 Assignment
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Accused Products
Abstract
A power supply circuit having a standby mode includes an input terminal, an output terminal and a reference terminal. A direct voltage source is connected to the input terminal and the reference terminal and a load is connected to the output terminal and the reference terminal. A series arrangement of an inductive element and a diode are connected to one another at a first node. The inductive element is connected between the input terminal and the first node and the diode is connected between the first node and the output terminal. A first electronic switch has a main current path connected between the first node and the reference terminal. A drive circuit periodically makes the main current path of the first electronic switch conductive and non-conductive. The drive circuit comprises a first switching device for making the main current path of the first electronic switch permanently non-conductive in response to a standby signal (SBS). A second electronic switch has a control electrode and a first and a second main electrode which constitute a main current path connected in parallel with the diode. A second switching device makes the main current path of the second electronic switch permanently conductive in response to the standby signal. In the standby mode the second electronic switch short-circuits the diode whereby more voltage is available at the output terminal.
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Citations
23 Claims
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1. A power supply circuit comprising:
- an input terminal and a reference terminal for connection of a direct voltage source to the input terminal and the reference terminal means for connection of a load to an output terminal and the reference terminal, a series arrangement of an inductive element and a diode connected to one another at a first node with the inductive element connected between the input terminal and the first node and the diode being connected between the first node and the output terminal, a first electronic switch having a main current path connected between the first node and the reference terminal, and a drive circuit for periodically making the main current path of the first electronic switch conductive and non-conductive, characterized in that the drive circuit comprises a first switching device for making the main current path of the first electronic switch permanently non-conductive in response to a standby signal, and a second electronic switch having a control electrode, and a first and a second main electrode which constitute a main current path connected in parallel with at least the diode of the series arrangement of the inductive element and the diode, and a second switching device for making the main current path of the second electronic switch permanently conductive in response to the standby signal.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A power supply circuit having an operating mode and a standby mode, said power supply circuit comprising:
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an input terminal and a reference terminal for connection to a source of DC voltage, an output terminal for connection to a load, an inductive element and a rectifier element serially connected between the input terminal and the output terminal and with a node therebetween, a first electronic switch connected between said node and said reference terminal, a free-running drive circuit for periodically switching the first electronic switch on and off, a further terminal for a standby signal, a first controlled switching device having a control electrode coupled to said further terminal and connected in circuit so as to hold the first electronic switch in cut-off so long as a standby signal is present at the further terminal, a second electronic switch connected in parallel with at least said rectifier element, and a second controlled switching device having a control electrode coupled to said further terminal and coupled to said second electronic switch to allow it to conduct in response to a standby signal at the further terminal and to cause it to cut-off in the absence of said standby signal at the further terminal. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification