POWER CONVERTER
First Claim
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1. A power converter having an input for receiving a supply voltage, a switch, and a duty cycle controller connected to control the switch to regulate an output voltage produced by the converter wherein the improvement comprises:
- a first circuit connected to said input and responsive to a first level over-voltage condition at said input for altering operation of duty cycle controller; and
a second circuit connected to said input and responsive to a second level over-voltage condition at said input to irreversibly change state without altering operation of the duty cycle controller.
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Abstract
A switch-type power converter includes a double FET switch operating in a variable duty cycle mode under the control of a Unitrode 3846 integrated circuit controller. Indications of excess input voltage and reverse battery connections are provided by circuits including an element which permanently changes state. A cooling fan mounted on a finned heat sink is operated in a variable speed mode.
81 Citations
17 Claims
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1. A power converter having an input for receiving a supply voltage, a switch, and a duty cycle controller connected to control the switch to regulate an output voltage produced by the converter wherein the improvement comprises:
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a first circuit connected to said input and responsive to a first level over-voltage condition at said input for altering operation of duty cycle controller; and a second circuit connected to said input and responsive to a second level over-voltage condition at said input to irreversibly change state without altering operation of the duty cycle controller. - View Dependent Claims (2, 3, 4)
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5. A power converter having an input connectible to an AC line voltage source, a rectifier for converting an AC line voltage to DC, a switching circuit comprising at least one power transistor, a transformer having a primary side connected to said rectifier and to said switch circuit and a secondary side connected to a converter output, a controller circuit for operating said switch circuit in a variable duty cycle mode wherein the improvement comprises:
a permanent over-voltage indicator circuit connected between said rectifier and ground and including the series combination of a voltage responsive semi-conductor device and an element which irreversibly changes state in response to the presence of an over-voltage condition at said rectifier output. - View Dependent Claims (6, 7, 8, 9)
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10. A power converter comprising an input for receiving a supply voltage, a switch including at least one power transistor, and a duty cycle controller connected to cycle the switch on and off;
- an over-voltage shut-down circuit connected between said input and said controller and comprising an operational amplifier;
said operational amplifier having an output, connected to a shut down pin of said controller to terminate cycling of the switch.
- an over-voltage shut-down circuit connected between said input and said controller and comprising an operational amplifier;
- 11. A power converter for charging a battery and having a switch, a duty cycle controller connected to the switch, a transformer having a primary side and a secondary side, an output inductor, the primary side being connected to the switch and the secondary side being connected to the output inductor, a circuit for indicating a reverse battery connection and comprising a device connected between the output inductor and ground and effective to irreversibly change state when a reverse battery connection is made.
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14. A power converter comprising a switch, a controller for controlling the duty cycle of the switch, a transformer, an output inductor and a converter output terminal;
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a circuit board having conductive traces formed thereon, the inductor being mounted on the current board such that at least one conductive trace runs from the inductor to the output terminal; and a heavy gauge wire conductively bonded to and along said one conductive trace.
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15. A power converter comprising a switch, a controller for controlling the duty cycle of the switch, a transformer, an output inductor and a converter output terminal;
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a circuit board having conductive traces formed thereon, at least one trace running from the transformer to the output terminal; and a heavy gauge wire conductively bonded to and along said one conductive trace.
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16. A power converter including a switch, a controller for varying the duty cycle of the switch, a heat sink for the switch, a fan for causing the fan to cause air to flow over the heat sink;
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a heat sensor; and a fan control circuit, the fan control circuit being operative to control the supply voltage source to vary the speed of the fan in response to increasing temperature of said sensor. - View Dependent Claims (17)
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Specification