Circuit and method for determining a current
First Claim
1. A method for determining a system current in a circuit that includes a converter circuit, comprising:
- splitting the system current into an input current and an auxiliary current, wherein the input current flows through a first resistor and a first energy storage element and the auxiliary current flows through a second resistor, and wherein a second energy storage element is absent from a current flow path of the auxiliary current;
converting a charging current into a reflection voltage representative of the input current;
converting the auxiliary current into a summer input voltage; and
adding the reflection voltage to the summer input voltage to generate a charger input voltage that is representative of the system current.
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Accused Products
Abstract
A power supply circuit having a converter circuit and method for determining a current flowing into the converter circuit. A converter circuit includes an amplifier and a current-to-current converter module. The amplifier has a current sensing element coupled between its inverting and noninverting input terminals. The amplifier generates a sensing signal from a charging current flowing through the current sensing element. The sensing signal is input into the current-to-current converter module, which scales the charging current and modulates the scaled charging current. The current-to-current converter module converts the modulated current to a charging voltage that is representative of the charging current. The charging current is converted to a current that is representative of the input current to converter circuit. The input current to the converter circuit is added to an auxiliary load current to yield the current of the power supply circuit.
7 Citations
13 Claims
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1. A method for determining a system current in a circuit that includes a converter circuit, comprising:
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splitting the system current into an input current and an auxiliary current, wherein the input current flows through a first resistor and a first energy storage element and the auxiliary current flows through a second resistor, and wherein a second energy storage element is absent from a current flow path of the auxiliary current; converting a charging current into a reflection voltage representative of the input current; converting the auxiliary current into a summer input voltage; and adding the reflection voltage to the summer input voltage to generate a charger input voltage that is representative of the system current. - View Dependent Claims (2, 3)
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4. A method for determining a system current in a circuit that includes a converter circuit, comprising:
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converting a charging current into a reflection voltage, wherein converting the charging current into the reflection voltage includes; generating a pulse width modulated control voltage; using the scaled current sense voltage and the pulse width modulated control voltage to generate a reflection current; and generating the reflection voltage from the reflection current, and converting an auxiliary current into a summer input voltage; and adding the reflection voltage to the summer input voltage to generate a charger input voltage that is representative of the system current. - View Dependent Claims (5, 6, 7)
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8. A power supply circuit, comprising:
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a system path coupled to a first node for receiving a first portion of a current, the system path comprising a first impedance having first and second terminals, wherein an energy storage elements is absent from the system path; and a battery charging path coupled to the first node for receiving a second portion of the current, the battery charging path comprising a second impedance having first and second terminals and wherein the first impedance is absent from the battery charging path and the energy storage element is present in the battery charging path. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification