DC converter using motor coil
AssigneeDigital Imaging Systems GmbH
InventorHorst Knoedgen
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Abstract
Circuits and methods system for a DC-to-DC conversion using the inductance of a motor coil are disclosed. The invention is especially applicable for mobile electronic devices having a motor and requiring a DC-to-DC conversion. By using the coil of the motor for DC-to-DC conversion and for the purpose of a motor no space for an additional coil is required. For motor control an H-bridge arrangement is provided allowing motor movement in both directions, to brake and free run. By adding two diodes and a capacitor and modulation of a switch of the H-bridge a DC-to-DC conversion has been made possible.
Claims16
A method to use an electric motor coil as inductor of a DC-to-DC converter comprising the following steps:
- (1) providing an electric motor having a coil, an H-bridge motor control, two diodes, a supply voltage and a capacitor;
- (2) increasing the current through said coil via a modulated switch in ON-state of said H-bridge;
- (3) transferring the energy accumulated in the coil during the On-state of the modulated switch to the capacitor during OFF state of said modulated switch;
- (4) applying the voltage across said capacitor, wherein said voltage is higher than the supply voltage;
- and
- (5) continuing modulating the switch causing storing energy in the coil and transferring subsequently the energy from the coil to the capacitor as long as the output voltage across the capacitor is required.
A system for a DC-to-DC conversion using the inductance of a motor coil comprising:
- a first switch having a first terminal connected to a supply voltage and a second terminal connected to a first terminal of a second switch and to a first terminal of a electric motor coil;
- said second switch having a second terminal connected to ground;
- a third switch having a first terminal connected to a supply voltage and a second terminal connected to a first terminal of a fourth switch and to a second terminal of said motor coil;
- said fourth switch having a second terminal connected to ground;
- said motor coil;
- a first diode having its anode connected to said first terminal of said motor coil and its cathode connected to a first terminal of a capacitor;
- a second diode having its anode connected to said second terminal of said motor coil and its cathode connected to a first terminal of a capacitor;
- and
- said capacitor, having its second terminal connected to ground, wherein the voltage across the capacitor is the output voltage of the DC-DC converter.
A system for a DC-to-DC conversion using the inductances of a electric motor comprising:
- a first pair of motor coils, comprising a first and a second coil connected in series, wherein a first terminal of a first coil is connected to a cathode of a first diode and to each of first terminals of a first and a second switch, wherein a second terminal of said first coil is connected to a cathode of a second diode, to each of first terminals of a third and a fourth switch, and to a first terminal of said second coil, and wherein a second terminal of said second coil is connected to a cathode of a third diode and to each of first terminals of a fifth and a sixth switch;
- said first, third, and fifth switches having all second terminals connected to a supply voltage;
- said second, fourth, and sixth switches having all second terminals connected to ground;
- said first, second and third diodes having all their cathodes connected to a first terminal of a capacitor;
- said capacitor, having its second terminal connected to ground, wherein the voltage across the capacitor is the output voltage of the DC-DC converter;
- a second pair of motor coils, comprising a third and a fourth coil connected in series, wherein a first terminal of a first coil is connected to each of first terminals of a seventh and a eighth switch, wherein a second terminal of said first coil is connected to each of first terminals of a ninth and a tenth switch, and to a first terminal of said fourth coil, and wherein a second terminal of said second coil is connected to each of first terminals of a eleventh and a twelfth switch;
- said seventh, ninth, and eleventh switches having all second terminals connected to a supply voltage;
- said eighth, tenth, and twelfth switches having all second terminals connected to ground;
- and
- said supply voltage.
Dependencies are inferred from the claim text.