# US 7,719,864 B2 · Pulse amplitude modulated current converter

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- Number: US 7,719,864 B2
- Document ID: US7719864B2
- Status: Granted
- Kind: B2
- Application number: 12/061,025
- Filed: 2008-04-02
- Published: 2009-10-08
- Granted: 2010-05-18
- Earliest claimed: 2008-04-02
- Assignees: Array Converter, Inc.
- Inventors: Kent Kernahan; Sorin Andrei Spanoche
- Web page: https://patentgrep.com/patent/US7719864B2

## CPC

- H02M 3/155: using semiconductor devices only
- H02M 3/158: including plural semiconductor devices as final control devices for a single load
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)

## Abstract

A direct current to pulse amplitude modulated (“PAM”) current converter, denominated a “PAMCC”, is connected to an individual source of direct current. The PAMCC receives direct current and provides pulse amplitude modulated current at its output. The pulses are produced at a high frequency relative to the signal modulated on a sequence of pulses. The signal modulated onto a sequence of pulses may represent portions of a lower frequency sine wave or other lower frequency waveform, including DC.

## Claims

### Claim 1

A pulse amplitude modulated current converter, wherein the pulse amplitude current converter is connected to a direct electrical current source, comprising:
a first and a second input terminal for receiving direct electrical current from the direct electrical current source, wherein one input terminal is connected to a positive electrical output terminal of the direct electrical current source and the other input terminal is connected to a negative electrical output terminal of the direct electrical current source;
a first coil connected in series with the first input terminal at a first terminal of the first coil;
a second coil connected in series with the second input terminal at a first terminal of the second coil;
a switch connected across a second terminal of the first coil and a second terminal of the second coil, wherein the switch includes a first terminal and a second terminal and a control gate;
a first SCR including a control gate and an anode terminal connected in parallel with the second terminal of the first coil and the first terminal of the switch;
a second SCR including a control gate and an anode terminal connected in parallel with the second terminal of the first coil and the first terminal of the switch;
a third SCR including a control gate and a cathode terminal connected in parallel with the second terminal of the second coil and the second terminal of the switch;
a fourth SCR including a control gate and a cathode terminal connected in parallel with the second terminal of the second coil and the second terminal of the switch;
a third coil connected between a first output terminal and a parallel connection comprising a cathode terminal of the first SCR, an anode terminal of the third SCR, and a first capacitor in series with a neutral terminal;
a fourth coil connected between a second output terminal and a parallel connection comprising a cathode terminal of the second SCR, an anode terminal of the fourth SCR, and a second capacitor in series with the neutral terminal; and
a controller, wherein the controller comprises:
an output terminal connected by a line to the control gate of the switch; and
four output terminals, each output terminal connected to a different SCR control gate by a line wherein the controller provides signals to control the switch and the first and the second and the third and the fourth SCR.

### Claim 2 (depends on 1)

The pulse amplitude modulated current converter of claim 1, wherein the controller comprises a microprocessor.

### Claim 3

A pulse amplitude modulated current converter, wherein the pulse amplitude current converter is connected to a direct electrical current source, comprising:
a first and a second input terminal for receiving direct electrical current from the direct electrical current source, wherein one input terminal is connected to a positive electrical output terminal of the direct electrical current source and the other input terminal is connected to a negative electrical output terminal of the direct electrical current source;
a first coil connected in series with the first input terminal at a first terminal of the first coil;
a second coil connected in series with the second input terminal at a first terminal of the second coil;
a first switch connected across the first terminal of the first coil and a second terminal of the second coil wherein the first switch includes a control gate;
a second switch connected across the first terminal of the second coil and a second terminal of the first coil wherein the second switch includes a control gate;
a first SCR including a control gate and an anode terminal connected to the second terminal of the first coil;
a second SCR including a control gate and an anode terminal connected to the second terminal of the first coil;
a third SCR including a control gate and a cathode terminal connected in parallel with the second terminal of the second coil;
a fourth SCR including a control gate and a cathode terminal connected in parallel with the second terminal of the second coil;
a third coil connected between a first output terminal and a parallel connection comprising a cathode terminal of the first SCR, an anode terminal of the third SCR, and a first capacitor in series with a neutral terminal;
a fourth coil connected between a second output terminal and a parallel connection comprising a cathode terminal of the second SCR, an anode terminal of the fourth SCR, and a second capacitor in series with the neutral terminal;
a controller, wherein the controller comprises:
an output terminal connected by a line to the control gate of the first switch;
an output terminal connected by a line to the control gate of the second switch; and
four output terminals, each output terminal connected by a line to a different SCR control gate wherein the controller provides signals to control the first and the second and the third and the fourth SCR.

### Claim 4 (depends on 3)

The pulse amplitude modulated current converter of claim 3, wherein the controller comprises a microprocessor.

### Claim 5 (depends on 3)

The pulse amplitude modulated current converter of claim 3, further comprising:
a third switch connected across the first and the second input terminals wherein the third switch includes a control gate;
a DPST relay across the third coil and the fourth coil wherein the relay is controlled by the controller to provide a connection between the third coil and the first output terminal and a connection between the fourth coil and the second output terminal, wherein the relay includes energizing connections;
an output terminal of the controller connected to the control gate of the third switch by a line, wherein the controller provides signals to the control gate of the third switch; and
an output terminal of the controller connected to the energizing connections of the relay, wherein the controller provides control signals to the energizing connections.