Primary side feedback (FB) switching power supply controller and switching power supply system
A technology of switching power supply and primary side feedback, which is applied in the direction of electrical components, output power conversion device, AC power input conversion to DC power output, etc., which can solve the problem of increasing the complexity of the peripheral system and the number of peripheral components, increasing the production cost, and increasing the controller Problems such as chip area and device utilization are low, so as to improve system stability, reduce complexity, and reduce chip area
Active Publication Date: 2011-11-09
FREMONT MICRO DEVICES SHENZHEN LTD
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[0006] figure 2 Both the current control loop and the voltage control loop of the controller shown require complex compensation circuits to ensure the system works stably under various operating conditions, thus increasing the production cost, the complexity of the peripheral system and the number of peripheral componen
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[0035] image 3 is a functional block diagram of a primary side feedback controller according to an embodiment of the present invention. like image 3 As shown, the primary side feedback switching power supply controller of the present invention includes: FB waveform detection module 101, triangular wave generation circuit 200, first comparator 111, narrow pulse generation circuit 112, second comparator 113, RS flip-flop 114 and constant flow / constant pressure control module 300. like image 3 As shown, the first input terminal FB of the FB waveform detection module 101 is connected to the primary side of the transformer, and the second input terminal of the FB waveform detection module 101 is connected to the fourth reference voltage V REF4 . The input terminal of the triangular wave generation circuit 200 is connected to the output terminal of the FB waveform detection module 101 to receive the feedback output voltage V TONS and based on the feedback output voltage V T...
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The invention relates to a primary side feedback (FB) switching power supply controller and a switching power supply system. The switching power supply system comprises a transformer, a voltage-dividing circuit, a main switch tube, an output circuit and the primary side FB switching power supply controller, wherein the voltage-dividing circuit is connected to the transformer; the power supply endof the primary side FB switching power supply controller is connected with the primary side first input end of the transformer; the FB control end of the primary side FB switching power supply controller is connected to the voltage-dividing point of the voltage-dividing circuit; the input end of the primary side FB switching power supply controller is connected with the grid of the main switch tube; the control end of the primary side FB switching power supply controller is connected to the source of the main switch tube; and the primary side FB switching power supply controller comprises an FB waveform detection module, a triangular wave generating circuit, a first comparer, a narrow pulse generating circuit, a second comparer and an RS (Reset-Set) trigger. Due to the implementation of the primary side FB switching power supply controller and the switching power supply system, provided by the invention, the system stability can be effectively improved, the complexity of a peripheral system can be lowered, the quantity of peripheral elements can be reduced, and the cost of a product can be reduced.
Description
technical field [0001] The invention relates to the field of switching power supplies, more specifically, to a primary side feedback switching power supply controller and a switching power supply system. Background technique [0002] AC / DC converters for converting high-voltage alternating current to low-voltage direct current required by the load have been developed quite maturely. For safety requirements, it is necessary to isolate the input and output through a transformer. Usually, it is necessary to use an optocoupler to feed back the information of the output voltage to the controller on the primary side, and the controller adjusts the output voltage according to the feedback information. However, the controller on the primary side still cannot detect the output current information and make appropriate adjustments. In recent years, more and more attention has been paid to the constant current and constant voltage technology that uses the primary side feedback technol...
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Inventor 朱建培
Owner FREMONT MICRO DEVICES SHENZHEN LTD
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