Apparatus and system for noise cancellation of power converters

• US 9,214,857 B2
• Filed: 11/11/2013
• Issued: 12/15/2015
• Est. Priority Date: 11/11/2013
• Status: Expired due to Fees

• Current Assignee: Takashi Kanamori
• Original Assignee: Takashi Kanamori
• Inventors: Kanamori, Takashi
• Primary Examiner(s): ZARROLI, MICHAEL C
• Application Number:
  US14/076,944
• Publication Number:
  US 20150130436A1
• Time in Patent Office: 764 Days
• US Class Current: 1/1
• CPC Class Codes: H02M 1/44 Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• CPC Class Codes: H02M 3/156 with automatic control of output voltage or current, e.g. switching regulators
• CPC Class Codes: H02M 3/158 including plural semiconductor devices as final control devices for a single load

Abstract

An apparatus and system comprise a noise cancelation power converter being configured for phase inverted synchronous operation with respect to a primary power converter. The primary power converter is operable to supply power to at least one device. The primary power converter produces a first electromagnetic interference during operation to supply the power. The first electromagnetic interference is coupleable to the device. The noise cancelation power converter further is configured with parasitic components substantially matching parasitic components of the primary power converter. The noise cancelation power converter further produces a second electromagnetic interference that is coupleable to the device. The second electromagnetic interference comprises frequency components having an inverted phase relative to frequency components of the first electromagnetic interference for substantially reducing a sum of the first electromagnetic interference and the second electromagnetic interference during coupling to the device.

Claims

1. An apparatus comprising:

a substrate, wherein said substrate comprising a common substrate;

a primary power converter circuit, the primary power converter being operable to supply power to at least one load device, the primary power converter circuit comprising;

a primary switching regulator circuit, said switching regulator being configured to switch states between on and off;

a primary switching node, wherein the switching operation of the primary switching regulator circuit creates a primary electro-magnetic interference signal at the primary switching node;

a noise cancellation power converter circuit, the noise cancellation power converter being configured for phase inverted synchronous operation with said primary power converter, the noise cancellation power converter circuit comprising;

a secondary switching regulator circuit, said switching regulator being configured to switch states between on and off in said phase inverted synchronous operation with said first switching regulator circuit, wherein the phase of said primary converter circuit is an inverse of the phase of the noise cancellation power converter circuit, the operation of the primary converter circuit is synchronous to the operation of the noise cancellation power converter circuit and both primary and noise cancellation circuits operate on the same clock signal, and wherein the primary power converter circuit and the noise cancellation power converter circuit operating side by side in said common substrate; and

a secondary switching node, wherein the switching operation of the secondary switching regulator circuit creates a noise cancellation electro-magnetic interference signal at the secondary switching node, the noise cancellation electro-magnetic interference signal are synchronized and operate in inverse phase with said primary electro-magnetic interference signal, thereby, creating a resultant electro-magnetic interference signal, which is an algebraic sum of the primary electro-magnetic interference signal and the noise cancellation electro-magnetic interference signal, and wherein said resultant electro-magnetic interference signal having a substantially reduced amplitude.

2. The apparatus as recited in claim 1, in which said noise cancellation power converter circuit and the primary power converter circuit are each comprising at least one of a buck converter circuit and boost converter circuit.

3. The apparatus as recited in claim 1, in which said noise cancellation power converter circuit further comprising a secondary MOSFET in phase inversion with respect to a switching signal of a primary MOSFET of the primary power converter circuit, wherein said noise cancelation power converter further being configured with parasitic components substantially matching parasitic components of the primary power converter.

4. The apparatus as recited in claim 1, in which at least one or both of said noise cancellation power converter circuit and said primary power converter circuit further comprises a snubber circuit for adjustment of at least one of the primary electromagnetic interference signal and noise cancellation electromagnetic interference signal.

5. The apparatus as recited in claim 1, in which said noise cancellation power converter circuit further comprises a passive circuit coupled to a control gate circuit for adjustment of the noise cancellation electromagnetic interference signal.

6. The apparatus as recited in claim 1, in which said at least one load device comprising an ASIC device, and in which said noise cancellation power converter is further configured for operation in a continuous conduction mode.

7. The apparatus as recited in claim 1, in which said noise cancellation power converter circuit comprising an open loop mode noise cancellation power converter circuit for providing at least one of an input voltage to a battery charger and an intermediate bus voltage.

8. The apparatus as recited in claim 1, in which said primary power converter circuit further comprising a sawtooth comparator being configured to compare an input signal with a sawtooth waveform and further configured to form a pulse width modulation (PWM) signal, wherein the PWM signal is provided to an input of a level shifter circuit forming a level shifted PWM signal.

9. The apparatus as recited in claim 1, in which said common substrate comprising at least one of a common printed circuit assembly substrate and a common integrated circuit substrate shared by said noise cancellation power converter circuit and the primary power converter circuit, and wherein the primary power converter circuit and the noise cancellation power converter circuit operates in said side by side operation in said common substrate.

10. The apparatus as recited in claim 1, in which said noise cancellation power converter circuit further comprises at least one of a boost and buck converter circuit.

11. An apparatus consisting of:

means for supplying power to at least one load device;

means for creating a primary electro-magnetic interference signal at a primary switching node;

means for operating in a phase inverted synchronous mode with said means for supplying power, wherein the phase of said means for supplying power is an inverse of the phase of the means for operating in a phase inverted synchronous mode, the operation of the means for supplying power is synchronous to the operation of the means for operating in a phase inverted synchronous mode and operating on the same clock signal, and the means for supplying power and the means for operating in a phase inverted synchronous mode operating side by side;

means for creating a noise cancellation electro-magnetic interference signal at a secondary switching node, wherein the noise cancellation electro-magnetic interference signal are synchronized and operate in inverse phase with said primary electro-magnetic interference signal, thereby, creating a resultant electro-magnetic interference signal, which is an algebraic sum of the primary electro-magnetic interference signal and the noise cancellation electro-magnetic interference signal, and wherein said resultant electro-magnetic interference signal having a substantially reduced amplitude;

means for adjusting at least one of a frequency and amplitude of at least one of the primary electromagnetic interference signal and noise cancellation electromagnetic interference signal.

12. A system comprising:

a primary power converter, said primary power converter being operable to supply power to at least one load device, said primary power converter comprising;

a primary switching regulator circuit, said switching regulator being configured to switch states between on and off;

a primary switching node, wherein the switching operation of the primary switching regulator circuit creates a primary electro-magnetic interference signal at the primary switching node;

a noise cancellation power converter being configured for phase inverted synchronous operation with respect to said primary power converter, said

noise cancellation power converter further being configured with parasitic components substantially matching parasitic components of the primary power converter, said noise cancellation power converter comprising;

a secondary switching regulator circuit, said switching regulator being configured to switch states between on and off in said phase inverted synchronous operation with said first switching regulator circuit, wherein the phase of said primary converter circuit is an inverse of the phase of the noise cancellation power converter circuit, the operation of the primary converter circuit is synchronous to operation of the noise cancellation power converter circuit operating and operating on the same clock signal, and the primary power converter and the secondary converter operating side by side in a common substrate; and

a secondary switching node, wherein the switching operation of the secondary switching regulator circuit creates a noise cancellation electro-magnetic interference signal at the secondary switching node, the noise cancellation electro-magnetic interference signal are synchronized and operate in inverse phase with said primary electro-magnetic interference signal, thereby, creating a resultant electro-magnetic interference signal, which is an algebraic sum of the primary electro-magnetic interference signal and the noise cancellation electro-magnetic interference signal, and

wherein said resultant electro-magnetic interference signal having a substantially reduced amplitude.

13. The apparatus as recited in claim 12, in which said noise cancellation power converter circuit and said primary power converter circuit are each further comprising at least one of a buck converter circuit and boost converter circuit.

14. The apparatus as recited in claim 12, in which said primary power converter circuit further comprising a sawtooth comparator being configured to compare an input signal with a sawtooth waveform and further configured to form a pulse width modulation (PWM) signal, wherein the PWM signal is provided to an input of a level shifter circuit forming a level shifted PWM signal.

15. The apparatus as recited in claim 12, in which at least one or both of said noise cancellation power converter and said primary power converter further comprises a snubber circuit for adjustment of at least one of a frequency and amplitude of at least one of the primary power converter circuit and noise cancellation power converter circuit electromagnetic interference components.

16. The apparatus as recited in claim 12, in which said noise cancellation power converter circuit or said primary power converter circuit further comprises a passive circuit coupled to a control gate for adjustment of electromagnetic interference components.

17. The apparatus as recited in claim 12, in which said load device comprising at least one of an ASIC load device and electrical load device, and in which said noise cancellation power converter circuit is further configured for operation in a continuous conduction mode.

18. The apparatus as recited in claim 12, in which said noise cancellation power converter circuit comprising an open loop mode noise cancellation power converter circuit for providing at least one of an input voltage to a battery charger and an intermediate bus voltage.

19. The apparatus as recited in claim 12, in which said noise cancellation power converter circuit is further configured for operation in proximity to said primary power converter circuit.

20. The apparatus as recited in claim 12, in which said common substrate comprising at least one of a common printed circuit assembly substrate and a common integrated circuit substrate shared by said noise cancellation power converter circuit and the primary power converter circuit, and

wherein the primary power converter circuit and the noise cancellation power converter circuit operates in said side by side operation in said common substrate.