Generating leakage canceling current in electric vehicle charging systems
First Claim
1. A non-isolated charger module, comprising:
- a power converter having a plurality of input leads, a first output lead, and a second output lead, wherein the power converter is adapted to receive an Alternating Current (AC) supply onto the plurality of input leads and to generate a positive Direct Current (DC) supply signal and a negative DC supply signal, and wherein the positive DC supply signal is supplied onto the first output lead and the negative DC supply signal is supplied onto the second output lead; and
a leakage current cancelation circuit having a first input lead and a second input lead, wherein the first input lead is coupled to the first output lead of the power converter, wherein the second input lead is coupled to the second output lead of the power converter, wherein the leakage current cancelation circuit generates a leakage cancelation current, and wherein the leakage cancelation current is supplied onto the plurality of input leads of the power converter.
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0 Petitions
Accused Products
Abstract
A system includes a power source, a power converter, a leakage current cancelation circuit, a load, and a ground node. The power converter is coupled to the power source and supplies the load. During operation of the power converter, a common mode current flows from the load to the ground node via a leakage capacitance. The leakage current cancelation circuit receives at least one signal indicative of the common mode current and generates a leakage cancelation current that is injected into at least one node of the system. The leakage cancelation current has a magnitude opposite a magnitude of the common mode current. For example, the leakage current cancelation circuit receives supply voltage signals output by the power converter, and generates and supplies the leakage cancelation current onto input nodes of the power converter such that a current level on the ground node is between −3.0 milliamperes and +3.0 milliamperes.
11 Citations
20 Claims
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1. A non-isolated charger module, comprising:
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a power converter having a plurality of input leads, a first output lead, and a second output lead, wherein the power converter is adapted to receive an Alternating Current (AC) supply onto the plurality of input leads and to generate a positive Direct Current (DC) supply signal and a negative DC supply signal, and wherein the positive DC supply signal is supplied onto the first output lead and the negative DC supply signal is supplied onto the second output lead; and a leakage current cancelation circuit having a first input lead and a second input lead, wherein the first input lead is coupled to the first output lead of the power converter, wherein the second input lead is coupled to the second output lead of the power converter, wherein the leakage current cancelation circuit generates a leakage cancelation current, and wherein the leakage cancelation current is supplied onto the plurality of input leads of the power converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method comprising:
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(a) receiving a first voltage signal onto a first input node of a leakage current cancelation circuit and receive a second voltage signal onto a second input node of the leakage current cancelation circuit, wherein the first voltage signal is received from a first output node of a power converter of an electric vehicle, and wherein the second voltage signal is received from a second output node of the power converter; (b) generating a current reference voltage signal from the received first and second voltage signals, wherein the current reference voltage signal is generated by summing and amplifying the received first and second voltage signals; and (c) generating a cancelation current using the generated current reference voltage signal and supplying the cancelation current onto input nodes of the power converter, wherein the cancelation current is generated such that a current level at a ground node of the electric vehicle is below a predetermined current level, and wherein the generating of (b) and the generating of (c) do not involve any inductor or transformer components. - View Dependent Claims (14, 15, 16)
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17. An electric vehicle charger module, comprising:
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a power converter adapted to receive an Alternating Current (AC) supply and generate a positive Direct Current (DC) supply signal and a negative DC supply signal; and means for generating a leakage cancelation current from the positive DC supply signal and the negative DC supply signal that are generated by the power converter, wherein the means is also for supplying the leakage cancelation current to the power converter such that a current level on a ground node of the electric vehicle charger module is maintained below a predetermined current level. - View Dependent Claims (18, 19, 20)
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Specification