Controller applied to secondary side of power converter and method of operation thereof
A technology of power converters and operating methods, which is applied in control/regulation systems, output power conversion devices, instruments, etc., and can solve problems such as low grid control signals, slow response of voltage regulator controllers, and sharp drop in output voltage.
Active Publication Date: 2021-03-23
LEADTREND TECH
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Problems solved by technology
Therefore, when the load on the secondary side of the power converter increases suddenly, because the output power of the secondary side of the power converter can only be provided by the capacitor coupled to the secondary side of the power converter , so the output voltage of the secondary side of the power converter will drop sharply, that is to say, because the frequency of the gate control signal is low, the response of the regulator controller to the change of the output voltage It is also slower, causing the voltage regulator controller to fail to quickly respond to a sudden increase in load, causing the output voltage to drop sharply
Method used
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[0062] Please refer to figure 1 , figure 1 It is a schematic diagram of a controller 200 applied to the secondary side SEC of the power converter 100 disclosed in the first embodiment of the present invention. Such as figure 1 As shown, the controller 200 includes a sampling / tracking circuit 202 and a comparator 204, wherein the sampling / tracking circuit 202 is coupled to the secondary side SEC of the power converter 100, and the comparator 204 is coupled to the sampling / tracking circuit 202 .
[0063] Such as figure 1 As shown, the sampling / tracking circuit 202 includes a voltage dividing unit 2022 , a regulating unit 2024 and a current mirror 2026 . The voltage dividing unit 2022 includes a first resistor 20222 and a second resistor 20224, wherein the voltage dividing unit 2022 is coupled to the secondary side SEC of the power converter 100 for receiving the secondary voltage of the power converter 100 through a pin VCC The output voltage VOUT of the side SEC, and using...
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The invention discloses a controller applied to a secondary side of a power converter and an operating method of the controller. The controller comprises a sampling / tracing circuit and a comparator, wherein the sampling / tracing circuit is coupled to a secondary side of the power converter and is used for generating a sampling value corresponding to an output voltage of the power converter when thesampling signal is started and generating a tracing value corresponding to the output voltage, the comparator is coupled to the sampling / tracing circuit and is used for generating a warning signal toa primary-side regulation controller of the power converter according to the sampling value and the tracing value during starting period of the tracing signal, the primary-side regulation controlleris used for adjusting a frequency of a gate control signal according to the warning signal, and the sampling signal and the tracing signal cannot be simultaneously started. The controller is suitablefor application requiring a variable output voltage, and ripple noise can be prevented so that the comparator generates the warning signal.
Description
technical field [0001] The present invention relates to a controller applied to the secondary side of a power converter and an operating method thereof, in particular to a controller capable of enabling the primary side regulation controller of a power converter to quickly respond to a sudden increase in load and its operation method. Background technique [0002] When the load on the secondary side of the power converter is light load, the frequency of the gate control signal generated by the voltage regulator controller on the primary side of the power converter is relatively low, so at this time the frequency of the gate control signal The cycle is longer. Therefore, when the load on the secondary side of the power converter increases suddenly, because the output power of the secondary side of the power converter can only be provided by the capacitor coupled to the secondary side of the power converter , so the output voltage of the secondary side of the power converter...
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IPC IPC(8): H02M3/335
CPCH02M3/33523
Inventor 余祥凤李敬赞
Owner LEADTREND TECH