Switch Mode Power Supply Current Monitoring and Protection
A switching mode power supply, overcurrent protection technology, applied in emergency protection circuit devices, electrical components, regulating electrical variables, etc., can solve the problem of increased driving loss and switching loss.
Active Publication Date: 2019-06-04
INFINEON TECH AUSTRIA AG
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AI Technical Summary
Problems solved by technology
High switching frequencies can lead to an increase in so-called drive losses and so-called switching losses
While drive losses are caused by the electrical power required to switch the switching elements, there are two different types of switching losses
The first type of switching losses is given by the simultaneous presence of a current through the switching element and a voltage across the terminals of the switching element during switching of the switching element ("hard switching" condition)
The second type of switching loss, typically referred to as capacitive loss, is caused by the parasitic capacitance associated with each switching element, which discharges across the resistance of the switching element itself when the switching element is activated
Method used
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Examples
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example 1
[0057] Example 1. An apparatus comprising: a switch mode power supply controller, wherein the switch mode power supply controller comprises: an inrush current comparator arranged to compare the primary winding current with the an inrush current threshold; and a switch controller arranged to control regulation of the output voltage by controlling switching on and off the primary switch based on a feedback signal based at least in part on the output voltage; and also arranged to, if the inrush current The comparator determines that the primary winding current has reached the inrush current threshold, controls the primary switch to turn off and remains off until at least the next switching cycle.
example 2
[0058] Example 2. The apparatus of example 1, wherein the burst phase is a backup phase.
example 3
[0059] Example 3. The device of any combination of examples 1-2, wherein the inrush comparator is arranged to compare the primary winding current with the inrush current threshold during the startup phase and the burst phase but not during the normal operation phase.
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The present invention relates to switch mode power supply current monitoring and protection. An apparatus for current protection includes a switch mode power supply controller. The switched mode power supply controller comprises an inrush current comparator arranged to compare the primary winding current with an inrush current threshold at least during at least one of a startup phase or a burst phase. The switch mode power supply controller also includes a switch controller arranged to control regulation of the output voltage by controlling switching on and off of the primary switch based on a feedback signal based at least in part on the output voltage. The switch controller is further arranged to, if the inrush current comparator determines that the primary winding current has reached the inrush current threshold, control the primary switch to turn off and to remain off until at least a next switching cycle.
Description
technical field [0001] The present disclosure relates to switched mode power supplies, and more particularly to current monitoring and protection for switched mode power supplies with isolated topologies. Background technique [0002] A switch mode power supply is an electronic power supply that uses a switching regulator to generate the supply voltage. High switching frequencies can lead to an increase in so-called driving losses and so-called switching losses. While drive losses are caused by the electrical power required to switch the switching elements, there are two different types of switching losses. The first type of switching losses is given by the simultaneous presence of a current through the switching element and a voltage across the terminals of the switching element ("hard switching" condition) during switching of the switching element. A second type of switching loss, typically referred to as capacitive loss, is caused by the parasitic capacitance associated...
Claims
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IPC IPC(8): H02H7/12H02M3/335
CPCH02H7/1213H02M3/33561H02M3/33592H02M1/36H02M3/33507H02M1/32H02M1/0009H02M3/33546
Inventor 鲍彤毛明平余伟福张国兴
Owner INFINEON TECH AUSTRIA AG