Device for improving primary side control precision of off-line power supply
A primary-side control, off-line technology, applied in the direction of irreversible AC power input conversion to DC power output, etc., can solve problems such as high requirements for transformer consistency, poor output voltage and voltage regulation, and deviation of peak current.
Inactive Publication Date: 2016-06-01
FSP POWERLAND TECH
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Problems solved by technology
However, it has disadvantages. This feedback scheme has high requirements on the consistency of the transformer, and the output voltage and voltage adjustment rate is poor, and the output current cannot be accurately controlled. The main reasons for these problems are: the change of the primary inductance of the transformer, There is a deviation between the actual peak current flowing through the primary coil and the peak current flowing through the sampling resistor R2
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[0018] An embodiment of the present invention proposes a device for improving the control accuracy of the primary side of an off-line power supply. When applied to an off-line power supply, it can improve the precision of the primary side control of the off-line power supply. More specifically, when the output voltage of the off-line power supply is low, its output current can be suppressed from being too high. In order to make the content of the present disclosure more comprehensible, the following specific embodiments are taken as examples in which the present disclosure can indeed be implemented. In addition, wherever possible, components / members / steps with the same reference numerals are used in the drawings and embodiments to represent the same or similar parts.
[0019] figure 2 It is a circuit diagram of an embodiment in which the device for improving primary-side control accuracy is applied to a flyback converter according to an embodiment of the present invention. ...
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The invention provides a device for improving primary side control precision of an off-line power supply. The device comprises a sampling control circuit. The sampling control circuit controls a primary side sampling circuit of the off-line power supply, and when the output voltage of the off-line power supply is smaller than a set value, the sampling control circuit controls to add the sampling references of the primary side sampling circuit of the off-line power supply. The device is applied to the off-line power supply and is capable of improving the precision of off-line primary side control, and more specifically, when the output voltage of the off-line power supply is relatively low, the relatively high output current of the off-line power supply is inhibited.
Description
technical field [0001] The invention relates to the primary side control technology of the off-line power supply, and in particular to a device for improving the control accuracy of the primary side of the off-line power supply. Background technique [0002] The most obvious feature of the offline power supply is that it contains an isolation transformer. The isolation transformer isolates the input and output of the offline power supply. Therefore, if the output of the offline power supply needs to be controlled, a feedback signal that can cross the isolation transformer is required. Feedback through optocouplers is a commonly used feedback method across the isolation transformer. The current-type feedback of the optocoupler makes it have the advantages of high precision and fast feedback speed, but the optocoupler feedback also has problems such as being greatly affected by temperature, the life of the optocoupler itself is short, and the anti-interference ability is poor....
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IPC IPC(8): H02M7/12
Inventor 徐明王向朝左全平
Owner FSP POWERLAND TECH