SWITCHED MODE POWER SUPPLY
First Claim
Patent Images
1. A method of controlling a switched mode power supply to convert an input to an output, the switched mode power supply comprising a transformer having a primary side and a secondary side,and a switch on the primary side of the transformer, the method comprising:
- switching the switch on to connect the primary side of the transformer to the input, andswitching the switch off to disconnect the primary side of the transformer to the input, effecting control of the switch at the mid point of the on-time being the period between the switching on of the switch and the switching off of the switch.
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Abstract
The present application relates to switched mode power supplies and provides a method of control in which control is effected at the midpoint of the period in which the input switch is conducting.
27 Citations
67 Claims
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1. A method of controlling a switched mode power supply to convert an input to an output, the switched mode power supply comprising a transformer having a primary side and a secondary side,
and a switch on the primary side of the transformer, the method comprising: -
switching the switch on to connect the primary side of the transformer to the input, and switching the switch off to disconnect the primary side of the transformer to the input, effecting control of the switch at the mid point of the on-time being the period between the switching on of the switch and the switching off of the switch. - View Dependent Claims (2, 3, 5, 9, 12, 13, 14, 15, 20, 23, 24, 29, 30, 31, 32)
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- 34. A controller for effecting control of a switch in a switch mode power supply by providing a switching signal to the switch to cause it to be switched on for an on-time of a switching period, the controller being configured to effect control of the switch at the mid point of the on-time.
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61. A Switched Mode Power Supply (SMPS) for converting an input to an output, the SMPS comprising:
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a transformer having a primary side and a secondary side, a switch for switchably connecting the primary side of the transformer to the input; a controller for effecting control of a switch in a switch mode power supply by providing a switching signal to the switch to cause it to be switched on for an on-time of a switching period, the controller being configured to effect control of the switch at the mid point of the on-time. - View Dependent Claims (62, 63, 64, 66)
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67. A light comprising:
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a fitting for engaging with a light socket and receiving mains power, a main body connected to the fitting and housing electronic circuitry; a head section comprising at least one LED driven by the electronic circuitry, wherein the electronic circuitry comprises; a rectifier circuit for rectifiying the received mains power; an SPMS circuit, for providing a drive current to the at least one LED, comprising a transformer having a primary side and a secondary side with the at least one LED being driven by the secondary side, a switch for switchably connecting the primary side of the transformer to the rectified mains power;
wherein the electronic circuitry is configured to effect control of the operation of the switch at the mid point of the on-time of the switch.
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Specification