Switching mode power controller of large dynamic range

Claim 2

In a circut for producing a three state, PDM output, the combination comprising a. switches S 1 and S 3 connected in series and across a voltage source, S 1 and S 3 being in opposite states of conduction, b. switches S 2 and S 4 connected in series and across the voltage source S 2 and S 4 being in opposite states of conduction, c. a load with one end connected with the common point between switches S 1 and S 3 and the other end connected with the common point between switch S 2 and S 4 , and d. means to produce a short pulse of interval Δt across the load by controlling the switches to switch from one of the two states which produce 0 voltage across the load (S 1 ON and S 2 ON, or S 3 ON and S 4 ON), to an intermediate state where voltage is produced across the load (S 1 ON and S 4 ON, or S 3 ON and S 2 ON), and then to other 0 voltage state, said means including a wave generator and comparator means responsive to the output of the wave generator and to an input signal waveform V s to produce a first comparison output for controlling S 1 and S 3 , and a second comparison output for controlling S 2 and S 4 .

Claim 3

The circuit of claim 1 wherein said comparator means includes two comparators and is operable to cause a shift from a state where S 1 and S 2 (or S 3 and S 4 ) are both ON to the state where S 3 and S 4 (or S 1 and S 2 ) are both ON by first turning one and then the other of S 3 or S 4 (or S 1 or S 2 ) to ON states at sequential initiation times defining the interval Δt.

Claim 4

The circuit of claim 2 wherein said generator comprises a triangular wave generator having a triangular wave output connected with both comparators.

Claim 5

The circuit of claim 2 wherein the first comparator is responsive to values of V s of one polarity, and said first named means includes an inverter responsive to V s and having an output connected to the second comparator so that the second comparator is responsive to values of V s of the opposite polarity.

Claim 6

The circuit of claim 1 wherein the switches comprise power transistors.

Claim 7

The circuit of claim 1 including diodes connected across each of the switches S 1 to S 4 .

Claim 8

The circuit of claim 4 including a filter connected at the input to the load.

Claim 9

The circuit of claim 1 including said voltage source, which is a DC source.

Claim 10

In a circuit for producing a three state, PDM output, the combination comprising a. switches S 1 and S 3 connected in series and across a voltage source, S 1 and S 3 being in opposite states of conduction, b. switches S 2 and S 4 connected in series and across the voltage source, S 2 and S 4 being in opposite states of conduction, c. said source being a DC source which includes effectively two DC supplies having a common connection therebetween, d. and a load having one end connected with said common connection, and the other end connected with the center tap of a transformer, one end of said transformer connected with the common point of S 1 and S 3 , and the other end of said transformer connected with the common point of S 2 and S 4 , and the conduction states of S 2 and S 4 interchanged, e. and control means operatively connected with said switches and including a wave generator and comparator means responsive to the output of the wave generator and to an input signal waveform V s to produce a first comparison output for controlling S 1 and S 3 , and a second comparison output for controlling S 2 and S 4 .

Claim 11

In a circuit for producing a three state, PDM output, the combination comprising a. switches S 1 and S 3 connected in series and across a voltage source, S 1 and S 3 being in opposite states of conduction, b. switches S 2 and S 4 connected in series and across the voltage source, S 2 and S 4 being in opposite states of conduction, c. said source being a DC source which includes effectively two DC supplies having a common connection therebetween, d. and a load having one end connected with said common connection, and the other end connected with the center tap of a transformer, one end of said transformer connected with the common point of S 1 and S 3 , and the other end of said transformer connected with the common point of S 2 and S 4 , and the conduction states of S 2 and S 4 interchanged, e. and control means operatively connected with said switches and including a wave generator and comparator means responsive to the output of the wave generator and to an input signal waveform V s to produce a first comparison output for controlling S 1 and S 3 , and a second comparison output for controlling S 2 and S 4 .

Claim 12

The circuit of claim 1 wherein said comparator means includes two comparators each of which is connected to receive as inputs the wave generator output and V s , one of such inputs to one comparator being inverted relative to its corresponding input to the other comparator.

Claim 13

The circuit of claim 9 wherein said comparator means includes two comparators each of which is connected to receive as inputs the wave generator output and V s , one of such inputs to one comparator being inverted relative to its corresponding input to the other comparator.