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switch mode power supply

A switch-mode power supply, power supply technology, applied in electrical components, regulating electrical variables, emergency protection circuit devices, etc., can solve problems such as increasing the number of established signal conduction and increasing circuit complexity.

Active Publication Date: 2016-04-06
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] The need to monitor the mains voltage level requires the controller to process additional signals, which increases the complexity of the circuit and increases the number of setup signal transductions

Method used

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Embodiment Construction

[0058] The present invention provides a power supply in which an overpower protection means is provided based on the same signal as used for the feedback path to control switching of the power supply. This means that no additional signals need to be supplied to the control circuit to implement the mains overprotection device.

[0059] For example, current solutions use an extra pin for the overpower protection device (OPP). The auxiliary winding is used to sense the main input voltage through the transformer. This voltage is then measured through a resistor divider on a dedicated pin. A dedicated pin is internally connected to an over-power protection circuit that limits the peak current flowing through the sense resistor Rsense measured through a separate sense pin.

[0060] The present invention enables the use of the same signal and the same pins for current sensing and main input voltage sensing. Current sensing can be achieved in the aforementioned solutions by measuri...

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Abstract

A switch-mode power supply having an overpower protection device based on the same signal as the feedback path is used to control switching of said power supply and control method thereof. This means that no additional signals need to be supplied to the control circuit to implement the mains overprotection device.

Description

technical field [0001] The present invention relates to a switched mode power supply capable of compensating for maximum output power variations caused by mains supply input voltage. Background technique [0002] Mains powered equipment typically employs a switched mode power supply in order to generate the voltage required by the internal equipment from the mains supply. [0003] In a mains supply connected to a flyback switched mode power supply (SMPS), the output power is usually dependent on the mains input voltage. Maximum output power generally increases with increasing mains voltage. The output power can be increased by a mode of operation, such as quasi-resonant operation, or by a delay in the current sensing circuit. [0004] figure 1 A typical flyback SMPS is shown. [0005] A rectified power supply 2 is provided on the primary side of the transformer T1. For example the circuit is designed to receive voltages in the range of 85V to 276V to be able to be used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02H7/10H02M1/00H02M1/32
CPCH02M1/32H02M3/33507H02M1/0025
Inventor 琼·维夏德·斯特里耶克
Owner NXP BV