Electronic Devices and Method for Filtering Common Mode Disturbances from Power Electronic Devices

An electronic device comprising:

• a first capacitor coupled in series to a first one-way conductor, the first one-way conductor allowing current flow in one direction, wherein the first one-way conductor and the first capacitor are coupled between a load node and a reference potential;
• a second capacitor coupled in series to a second one-way conductor, the second one-way conductor allowing current flow in an opposite direction, wherein the second one-way conductor and the second capacitor are coupled between the load node and the reference potential;
• a third capacitor being coupled between the load node and the reference potential;
• a first switch bypassing the first one-way conductor;
• and
• a second switch bypassing the second one-way conductor.

An electronic device comprising:

• a first capacitor coupled in series to a first one-way conductor, wherein the first one-way conductor and the first capacitor are coupled between a load node and a reference potential;
• a second capacitor coupled in series to a second one-way conductor, wherein the second one-way conductor and the second capacitor are coupled between the load node and the reference potential;
• a third capacitor coupled in series to a third one-way conductor, wherein the third one-way conductor and the third capacitor is coupled between the load node and the reference potential;
• a fourth capacitor coupled in series to a fourth one-way conductor, wherein the fourth one-way conductor and the fourth capacitor are coupled between the load node and the reference potential, wherein the first and third one-way conductors allow current flow in one direction, and wherein the second and fourth one-way conductors allow current flow in the opposite direction,
• a first switch coupled between a first potential node and a second potential node, wherein the first potential node is arranged between the first capacitor and the first one-way conductor, and wherein the second potential node is arranged between the second capacitor and the second one-way conductor;
• and
• a second switch coupled between a third potential node and a fourth potential node, wherein the first potential node is arranged between the third capacitor and the third one-way conductor, and wherein the fourth potential node is arranged between the fourth capacitor and the fourth one-way conductor.

An electronic device comprising:

• a first capacitor coupled in series to a first one-way conductor, the first one-way conductor allowing current flow in one direction, wherein the first one-way conductor and the first capacitor are coupled between a load node and a reference potential;
• a second capacitor coupled in series to a second one-way conductor, the second one-way conductor allowing current flow in an opposite direction, wherein the second one-way conductor and the second capacitor are coupled between the load node and the reference potential;
• a third capacitor coupled between the load node and the reference potential;
• and
• an amplifier having an output terminal, and positive and negative supply rail terminals, the output terminal being coupled to the load node, the positive supply rail terminal being coupled to a first potential node, which is between the first capacitor and the first one-way conductor, and the negative supply rail terminal being coupled to a second potential node, which is between the second capacitor and the second one-way conductor.

A method for filtering a common mode disturbances by an electronic device, wherein the device comprises a first capacitor coupled in series to a first one-way conductor, the first capacitor and the first one-way conductor being coupled between a load node and a reference potential, a second capacitor coupled in series to a second one-way conductor, the second capacitor and the second one-way conductor being coupled between the load node and the reference potential, a third capacitor coupled between the load node and the reference potential, and a first switch coupled in parallel with the first one way conductor and a second switch coupled in parallel with the second one way conductor, the method comprising:

• applying alternating positive and negative voltage transitions at the load node;
• charging the first capacitor and the third capacitor positive by one positive voltage transition of the load node, wherein the first one-way conductor is in the conduction state thereby transferring energy to the first capacitor and the third capacitor;
• discharging the second capacitor and the third capacitor, the second capacitor having been charged negative by a previous negative voltage transition at the load node, when the second switch is switched to the conducting state;
• switching the second switch to the non-conducting state;
• charging the second capacitor and the third capacitor negative by one negative voltage transition of the load node, wherein the second one-way conductor is in the conduction state thereby transferring energy to the second capacitor and the third capacitor;
• discharging the first capacitor and third capacitor, the first capacitor having been charged positive by a previous positive voltage transition at the load node, when the first switch is switched to the conducting state;
• and
• switching the first switch to the non-conducting state.

A method for filtering common mode disturbances by an electronic device, wherein the device comprises a first capacitor coupled in series to a first one-way conductor, the first capacitor and the first one-way conductor being coupled between a load node and a reference potential, a second capacitor coupled in series to a second one-way conductor, the second capacitor and the second one-way conductor being coupled between the load node and the reference potential, a third capacitor coupled in series to a third one-way conductor, the third capacitor and the third one-way conductor being coupled between the load node and the reference potential, a fourth capacitor coupled in series to a fourth one-way conductor, the fourth capacitor and the fourth one-way conductor being coupled between the load node and the reference potential, a first switch coupled between a first potential node, which is between the first capacitor and the first one-way conductor, and a second potential node, which is between the second capacitor and the second one-way conductor, a second switch coupled between a third potential node, which is between the third capacitor and the third one-way conductor, and a fourth potential node, which is between the fourth capacitor and the fourth one-way conductor, the method comprising:

• applying alternating positive and negative voltage transitions at the load node;
• charging the first capacitor and the third capacitor positive by one positive voltage transition of the load node, wherein the first one-way conductor and the third one-way conductor are in the conduction state thereby transferring energy to the first capacitor and the third capacitor;
• discharging the first capacitor and the second capacitor, the second capacitor having been charged negative by a previous negative voltage transition at the load node , when the first switch is switched to the conducting state;
• switching the first switch to the non-conducting state;
• charging the second capacitor and the fourth capacitor negative by one negative voltage transition of the load node, wherein the second one-way conductor and the fourth one-way conductor are in the conduction state thereby transferring energy to the second capacitor and the fourth capacitor;
• discharging the third capacitor and the fourth capacitor, the third capacitor having been charged positive by the previous positive voltage transition at the load node, when the second switch is switched to the conducting state;
• and
• switching the second switch to the non-conducting state.

A method for filtering common mode disturbances by an electronic device, wherein the device comprises a first capacitor coupled in series to a first one-way conductor, wherein the first capacitor and the first one-way conductor are coupled between a load node and a reference potential, a second capacitor coupled in series to a second one-way conductor, wherein the second capacitor and the second one-way conductor are coupled between the load node and the reference potential, a third capacitor coupled between the load node and the reference potential, and an amplifier having an output terminal, and positive and negative supply rail terminals, the output terminal being coupled to the load node, the positive supply rail terminal being coupled to the first capacitor and the negative supply rail terminal being coupled to the second capacitor, the method comprising:

• applying positive and negative voltage transitions at the load node;
• charging the first capacitor positive by positive voltage transitions of the load node, wherein the first one-way conductor is in a conduction state thereby transferring energy to the first capacitor;
• charging the second capacitor negative by negative voltage transitions of the load node, wherein the second one-way conductor is in a conduction state thereby transferring energy to the second capacitor;
• charging the third capacitor positive when a positive transition is applied and negative when a negative transition is applied;
• discharging the third capacitor to a voltage near to reference potential into the output terminal of the amplifier;
• at least partially discharging the first capacitor via the positive supply rail terminal of the amplifier;
• and
• at least partially discharging the second capacitor via the negative supply rail terminal of the amplifier.