Apparatus and method for recycling the energy from load capacitance
The present invention provides a voltage regulator/power converter capable of bidirectional power propagation, fitted with controls capable of raising and lowering voltages with unprecedented speed and accuracy. The bidirectional capability allows energy stored in capacitors to be returned to system power sources. In one embodiment of the invention power is supplied from a power source (on a first port of the power converter) to the load (on a second port of the power converter) through the converter and then, when load voltage is reduced or turned off, energy in the load capacitance is returned from to the power source. In an alternative embodiment energy from load capacitance is stored or used by a device on a third port of the power converter.
1. A switched mode power converter comprising:
an inductive reactor,
a load port for supplying energy to a load, the load having a substantial capacitive component;
at least one other port;
at least two power switches connecting the inductive reactor, load port and at least one other port; and
control circuitry;
wherein energy is supplied to the load from the load port and excess energy from the capacitive component of the load is returned through the load port and converter to the at least one other port.
2. The converter of claim 1 wherein the at least one other port is connected to a power source.
3. The converter of claim 2 wherein the power source is a battery.
4. The converter of claim 2 wherein the power source is a power supply.
5. The converter of claim 1 , wherein said inductive reactor is a two-terminal inductor.
6. The converter of claim 1 , wherein said inductive reactor is a transformer.
7. The converter of claim 1 , comprising plural inductive reactors.
8. The converter of claim 1 wherein the load is a portable electronic device.
9. The converter of claim 1 wherein the load is a computer.
10. The converter of claim 1 wherein the excess energy is the result of reducing power to or turning off the load.
11. The method of:
transferring energy from a significantly capacitive load in circuit with a port of a switched mode power converter into an inductive reactor and,
transferring said energy now in said inductive reactor to another port for immediate use or for storage.
12. The method of claim 11 wherein the energy transferred from the load capacitance to another port effects a desired voltage reduction at the load.