Method, circuit and apparatus for increasing robustness to inrush current in power switching devices
An electronic circuit and circuit technology, applied in the direction of output power conversion devices, conversion equipment without intermediate conversion to AC, electrical components, etc., can solve problems such as permanent damage, inrush current, damage, etc.
Active Publication Date: 2021-01-08
STMICROELECTRONICS SRL
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- Description
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Problems solved by technology
[0004] Exceeding some specifications for electronic equipment may cause temporary failure or permanent damage to the electronic equipment or other equipment coupled to the electronic equipment
For example, shorting the output of an SMPS to ground can cause an overcurrent event that causes permanent damage to the SMPS (e.g., one or more power FETs) and, in some cases, even damage to the PCB and PCB traces permanent damage to
As another example, in some cases, turning on a power supply suddenly may cause an inrush current that may cause temporary or permanent damage to the power supply and / or components coupled to the power supply
Method used
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[0019] The making and using of the presently preferred embodiments are discussed in detail below. It should be appreciated, however, that the present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention.
[0020] The following description illustrates various specific details that provide an in-depth understanding of several example embodiments in light of the description. Embodiments may be obtained without one or more of the specific details, or using other methods, components, materials, etc. In other instances, known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the embodiments. Reference to "an embodiment" in this specification indicates that a specific configuration, structure, or characteristic ...
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Embodiments of the present disclosure relate to methods, circuits and apparatus for increasing robustness to inrush current in power switching devices. According to an embodiment, a method includes receiving an enable signal. After the enable signal is asserted, it is determined whether the soft-start capacitor is electrically connected to the input of the ramp generator circuit while holding the output of the ramp generator circuit low. If the soft-start capacitor is electrically connected to the input of the ramp generator circuit, a first current is injected into the input of the ramp generator circuit to generate a first voltage ramp at the output of the ramp generator circuit. If the soft-start capacitor is not electrically connected to the input of the ramp generator circuit, a second current is injected into the input of the ramp generator circuit to generate a second voltage ramp at the output of the ramp generator circuit. The second current is smaller than the first current.
Description
technical field [0001] The present invention relates generally to electronic circuits and, in particular embodiments, to methods for increasing robustness to inrush currents in power switching devices. Background technique [0002] In general, electronic circuits are typically designed to operate within a specific operating range. For example, a switched mode power supply (SMPS) may be designed to receive 12V and generate an output voltage of 3.3V capable of delivering 1A to a load. [0003] Certain systems may have power-on requirements for proper operation. For example, a processor may have multiple power inputs, and a processor may be designed to have a particular power input always at a higher voltage than another for proper operation. Similarly, an electronic device can be designed to increase the voltage at the power supply input at a specific rate during a power-on event for proper operation. [0004] Exceeding some specifications of an electronic device may cause ...
Claims
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IPC IPC(8): H02M1/32H02M1/36
CPCH02M1/32H02M1/36H03K4/50H02M3/07H03K4/023G05F1/461
Inventor M·马蒂尼
Owner STMICROELECTRONICS SRL