Method and device for overload protection of switching power supply
A switching power supply, overload protection technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as increasing the cost of power devices, and achieve the effect of reducing costs
Active Publication Date: 2013-03-20
TCL KING ELECTRICAL APPLIANCES HUIZHOU
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Problems solved by technology
When the switching power supply is overloaded and short-circuited, in order to protect the power supply and the load from damage, the method of limiting the peak current of the switch tube is usually used to limit the maximum output power, but when the load is a resistive load with large changes, it is necessary to use Power devices with higher power, thus increasing the cost of power devices
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[0026] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0027] refer to figure 1 , figure 1 It is a schematic flowchart of an embodiment of the switching power supply overload protection method of the present invention. The switching power supply overload protection method provided in this embodiment includes the following steps:
[0028] Step S10, obtaining the current error feedback voltage value of the switching power supply;
[0029] In this embodiment, an error feedback signal is provided in the switching power supply, and the current error feedback voltage value is obtained by obtaining the error feedback signal.
[0030] Step S20, judging whether the current error feedback voltage value is greater than the first error feedback voltage value at the maximum peak power of the switching power supply; if yes, execute step S30; otherwise, execute step S10.
[0031] St...
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The invention discloses a method and a device for overload protection of a switching power supply. The method for overload protection of the switching power supply comprises the steps of obtaining a current error feedback voltage value of the switching power supply; judging whether the current error feedback voltage value is larger than a first error feedback voltage value at the maximum peak power of the switching power supply or not; returning and executing the step of obtaining of the current error feedback voltage value of the switching power supply when the current error feedback voltage value is smaller than a second error feedback voltage value at the maximum average power of the switching power supply in a first preset time period if the current error feedback voltage value is larger than the first error feedback voltage value at the maximum peak power of the switching power supply; controlling the switching power supply to stop working if the current error feedback voltage value is larger than or equal to the second error feedback voltage value at the maximum average power of the switching power supply; and returning and executing the step of obtaining of the current error feedback voltage value of the switching power supply if the current error feedback voltage value is not larger than the first error feedback voltage value at the maximum peak power of the switching power supply. By the aid of the method and the device, the cost of an overload protection circuit of a resistive load with the large variation is reduced, the cost of the switching power supply is reduced, and the method and the device are applicable to industrial production.
Description
technical field [0001] The invention relates to the technical field of switching power supplies, in particular to an overload protection method and device for switching power supplies. Background technique [0002] The high frequency of switching power supply is the direction of its development. High frequency makes switching power supply miniaturized, and makes switching power supply enter a wider application field, especially in the application of high-tech fields, which promotes the miniaturization and portability of high-tech products change. In addition, the development and application of switching power supply are of great significance in saving energy, saving resources and protecting the environment. When the switching power supply is overloaded and short-circuited, in order to protect the power supply and the load from damage, the method of limiting the peak current of the switch tube is usually used to limit the maximum output power, but when the load is a resistiv...
Claims
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IPC IPC(8): H02H7/10
Inventor 王坚
Owner TCL KING ELECTRICAL APPLIANCES HUIZHOU