Primary side regulated power supply system with constant current output
DC CAFCFirst Claim
Patent Images
1. A power supply system comprising:
- an input terminal operable to receive an input voltage;
a transformer coupled to the input terminal and defining a primary side and a secondary side;
an output terminal coupled to the secondary side of the transformer and connectable to a load for providing current thereto; and
means for regulating the power supply system from the primary side so that the current provided to the load at the output terminal is substantially constant, wherein the means for regulating comprises;
a control circuit having a power switch through which drain current flows; and
the feedback circuit coupled to the control circuit;
wherein the control circuit and the feedback circuit are operable to regulate a voltage at the output terminal in a steady-state operation of the power supply system and further operable to provide a constant current output to the load when a voltage at the output terminal is lower than a certain value;
wherein the transformer comprises a first and second primary side winding and a secondary side winding, wherein the power switch of the control circuit is coupled to the first primary side winding, and wherein the output terminal is coupled to the secondary side winding.
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Abstract
According to an embodiment, a power supply system has a primary side and a secondary side. An input terminal on the primary side is operable to receive an input voltage. An output terminal on the secondary side is operable to be connected to a load for providing current thereto. Circuitry is provided which is operable to regulate the power supply system from the primary side so that the current provided to the load at the output terminal is substantially constant.
15 Citations
20 Claims
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1. A power supply system comprising:
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an input terminal operable to receive an input voltage; a transformer coupled to the input terminal and defining a primary side and a secondary side; an output terminal coupled to the secondary side of the transformer and connectable to a load for providing current thereto; and means for regulating the power supply system from the primary side so that the current provided to the load at the output terminal is substantially constant, wherein the means for regulating comprises; a control circuit having a power switch through which drain current flows; and the feedback circuit coupled to the control circuit; wherein the control circuit and the feedback circuit are operable to regulate a voltage at the output terminal in a steady-state operation of the power supply system and further operable to provide a constant current output to the load when a voltage at the output terminal is lower than a certain value; wherein the transformer comprises a first and second primary side winding and a secondary side winding, wherein the power switch of the control circuit is coupled to the first primary side winding, and wherein the output terminal is coupled to the secondary side winding. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power supply system comprising:
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an input terminal operable to receive an input voltage; a transformer coupled to the input terminal and defining a primary side and a secondary side; an output terminal coupled to the secondary side of the transformer and connectable to a load for providing current thereto; and means for regulating the power supply system from the primary side so that the current provided to the load at the output terminal is substantially constant, wherein the means for regulating comprises; a control circuit having a power switch through which drain current flows; and the feedback circuit coupled to the control circuit; wherein the control circuit has a feedback terminal and a peak drain current terminal, and wherein the feedback circuit is coupled to the feedback terminal and the peak drain current terminal of the control circuit; wherein the control circuit and the feedback circuit are operable to regulate a voltage at the output terminal in a steady-state operation of the power supply system and further operable to provide a constant current output to the load when a voltage at the output terminal is lower than a certain value.
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8. A power supply system comprising:
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an input trminal operable to receive an input voltage; a transformer coupled to the input terminal and defining a primary side and a secondary side; an output terminal coupled to the secondary side of the transformer and connectable to a load for providing current thereto; a control circuit coupled to the transformer and operable to control current flowing through the transformer, wherein the control circuit comprises a power switch through which drain current flows; and a feedback circuit coupled to the control circuit and the transformer, the feedback circuit operable to support regulation by the control circuit from the primary side so that the current provided to the load at the output terminal is substantially constant; wherein the transformer comprises a first and second primary side winding and a secondary side winding, wherein the power switch of the control circuit is coupled to the first primary side winding, and wherein the output terminal is coupled to the secondary side winding. - View Dependent Claims (9, 10, 11, 12)
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13. A power supply system comprising:
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an input terminal operable to receive an input voltage; a transformer coupled to the input terminal and defining a primary side and a secondary side; an output terminal coupled to the secondary side of the transformer and connectable to a load for providing current thereto; a control circuit coupled to the transformer and operable to control current flowing through the transformer, wherein the control circuit comprises a power switch through which drain current flows; and a feedback circuit coupled to the control circuit and the transformer, the feedback circuit operable to support regulation by the control circuit from the primary side so that the current provided to the load at the output terminal is substantially constant; wherein the transformer comprises a first and second primary side winding and a secondary side winding, wherein the power switch of the control circuit is coupled to the first primary side winding, and wherein the output terminal is coupled to the secondary side winding. - View Dependent Claims (14, 15)
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16. A power supply system comprising:
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an input terminal operable to receive an input voltage; a transformer coupled to the input terminal and defining a primary side and a secondary side; an output terminal coupled to the secondary side of the transformer and connectable to a load for providing current thereto; a control circuit coupled to the transformer and operable to control current flowing through the transformer, wherein the control circuit comprises a power switch through which drain current flows; and a feedback circuit coupled to the control circuit and the transformer, the feedback circuit operable to support regulation by the control circuit from the primary side so that the current provided to the load at the output terminal is substantially constant; wherein the control circuit has a feedback terminal and a peak drain current terminal, and wherein the feedback circuit is coupled to the feedback terminal and the peak drain current terminal of the control circuit.
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17. A power supply system having a primary side and a secondary side, the system comprising:
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an input terminal on the primary side operable to receive an input voltage; an output terminal on the secondary side operable to be connected to a load for providing current thereto; and circuitry operable to regulate the power supply system from the primary side so that the current provided to the load at the output terminal is substantially constant, wherein the circuitry comprising; a control circuit having a power switch through which drain current flows; and the feedback circuit coupled to the control circuit; wherein the control circuit and the feedback circuit are operable to regulate a voltage at the output terminal in a steady-state operation of the power supply system and further operable to provide a constant current output to the load when a voltage at the output terminal is lower than a certain value; wherein the control circuit has a feedback terminal and a peak drain current terminal, and wherein the feedback circuit is coupled to the feedback terminal and the peak drain current terminal of the control circuit. - View Dependent Claims (18, 19, 20)
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Specification