Power supply circuit
First Claim
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1. A power-supply circuit for powering a load (B) from an input voltage, comprising:
- a first terminal (N3) and a second terminal (N2) for receiving the input voltage;
a switching transistor (T1) which, in series with a diode (D2) poled in the reverse direction, is connected between the first terminal (N3) and the second terminal (N2);
a self-inductance (L2) which, in series with the load (B) to be powered, is connected across the diode (D2); and
a driver stage for turning on and turning off the switching transistor (T1), characterized in that the driver stage comprises means (MMV) for turning off the switching transistor (T1) for a predetermined time interval when a predetermined peak current through the switching transistor (T1) is reached.
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Abstract
A buck converter comprises a load or a rechargeable battery (B), a self-inductance (L2), a diode (D2) and a switching transistor (T1). The current through the switching transistor (T1) is measured by means of a current sensor (Rs) which triggers a monostable multivibrator (MMV) when a given peak current is reached. The monostable multivibrator (MMV) turns off the switching transistor (T1) for a fixed time within which the current through the self-inductance (L2) is supplied to the load (B) via the diode (D2).
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Citations
28 Claims
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1. A power-supply circuit for powering a load (B) from an input voltage, comprising:
- a first terminal (N3) and a second terminal (N2) for receiving the input voltage;
a switching transistor (T1) which, in series with a diode (D2) poled in the reverse direction, is connected between the first terminal (N3) and the second terminal (N2);
a self-inductance (L2) which, in series with the load (B) to be powered, is connected across the diode (D2); and
a driver stage for turning on and turning off the switching transistor (T1), characterized in that the driver stage comprises means (MMV) for turning off the switching transistor (T1) for a predetermined time interval when a predetermined peak current through the switching transistor (T1) is reached. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
- a first terminal (N3) and a second terminal (N2) for receiving the input voltage;
Specification