Analog photovoltaic power circuit
First Claim
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1. An analog photovoltaic power circuit, comprising:
- a primary photovoltaic device group for receiving photo energy and generating an input voltage;
a power stage for converting the input voltage to an output voltage;
an optimum voltage point estimation circuit for estimating an optimum voltage point according to a ratio of the open circuit voltage of the primary photovoltaic device group; and
an analog comparison and control circuit for controlling the conversion operation of the power stage according to a comparison between the optimum voltage point estimated by the optimum voltage point estimation circuit and the input voltage.
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Abstract
The present invention discloses an analog photovoltaic power circuit, comprising: a photovoltaic device group for receiving photo energy to generate an input voltage; a power stage circuit for converting the input voltage to an output voltage; an optimum voltage estimation circuit for receiving a predetermined voltage and estimating an optimum voltage according to a direction of variation of the input voltage and a direction of variation of the power generated by the photovoltaic device group; and an analog comparison and control circuit for comparing the optimum voltage with the input voltage, to thereby control the operation of the power stage circuit.
131 Citations
46 Claims
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1. An analog photovoltaic power circuit, comprising:
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a primary photovoltaic device group for receiving photo energy and generating an input voltage; a power stage for converting the input voltage to an output voltage; an optimum voltage point estimation circuit for estimating an optimum voltage point according to a ratio of the open circuit voltage of the primary photovoltaic device group; and an analog comparison and control circuit for controlling the conversion operation of the power stage according to a comparison between the optimum voltage point estimated by the optimum voltage point estimation circuit and the input voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An analog photovoltaic power circuit, comprising:
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a primary photovoltaic device group for receiving photo energy and generating an input voltage; a power stage for converting the input voltage to an output voltage; an optimum voltage point estimation circuit receiving a predetermined voltage and estimating an optimum voltage point according to a direction of variation of the input voltage and a direction of variation of the power generated by the primary photovoltaic device group; and an analog comparison and control circuit for controlling the conversion operation of the power stage according to a comparison between the optimum voltage point estimated by the optimum voltage point estimation circuit and the input voltage. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An analog photovoltaic power circuit, comprising:
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a photovoltaic device group for receiving photo energy and generating an input voltage, the input voltage corresponding to an input current; a power stage for converting the input voltage to an output voltage; an optimum voltage point estimation circuit for receiving a predetermined voltage and estimating the optimum voltage point according to a direction of variation of the input current and a direction of variation of the power generated by the primary photovoltaic device group; and an analog comparison and control circuit for controlling the conversion operation of the power stage according to a comparison between the optimum voltage point estimated by the optimum voltage point estimation circuit and the input voltage. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A method for extracting energy from a photovoltaic device group, comprising the steps of:
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providing a reference voltage of about 70% to about 90% of an open circuit voltage of the photovoltaic device group; comparing an output voltage of the photovoltaic device group with the reference voltage, to control the output voltage of the photovoltaic device group substantially at the reference voltage; and extracting energy from the photovoltaic device. - View Dependent Claims (38, 39, 40)
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41. A method for calculating an optimum voltage point of a photovoltaic device group, comprising the steps of:
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providing a predetermined initial value of a reference voltage; estimating a direction of variation of the output voltage of the photovoltaic device group; estimating a direction of variation of the output power of the photovoltaic device group; comparing the two directions, and increasing the reference voltage when both directions are the same, and decreasing the reference voltage when both directions are opposite; and using the adjusted reference voltage as the optimum voltage point. - View Dependent Claims (42, 43)
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44. A method for calculating an optimum voltage point of a photovoltaic device group, comprising the steps of:
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providing a predetermined initial value of a reference voltage; estimating a direction of variation of the output current of the photovoltaic device group; estimating a direction of variation of the output power of the photovoltaic device group; comparing the two directions, and decreasing the reference voltage when both directions are the same, and increasing the reference voltage when both directions are opposite; and using the adjusted reference voltage as the optimum voltage point. - View Dependent Claims (45, 46)
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Specification