A cs sampling resistor short-circuit protection device for switching power supply
A sampling resistor and short-circuit protection technology, which is applied in the direction of emergency protection circuit devices and electrical components, etc., can solve problems such as potential safety hazards, hidden dangers of normal operation of switching power supplies, device damage or short-circuit, etc., and achieve the effect of reliable short-circuit protection
Active Publication Date: 2019-01-25
成都启臣微电子股份有限公司
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Problems solved by technology
[0003] Since there are many factors in the production, testing and use of the switching power supply, some components in the system may be damaged or short-circuited, thereby causing safety hazards to the normal operation of the switching power supply. Self-protection or non-operation in case of damage or short circuit, thus further improving the safety of switching power supply system
For example, in a switching power supply application system, if the CS sampling resistor is damaged or the CS sampling resistor is short-circuited due to poor welding in the production process, the current flowing through the power tube of the traditional switching power supply during use will be very large, which may exceed the current of the power tube. The safe upper limit of the current may saturate the transformer core, which will lead to the phenomenon of "explosion", which will bring great safety hazards to production and use
[0004] The existing switching power supply application technology rarely involves the protection technology of CS sampling resistor short circuit. The main technical difficulties are: 1. Under the condition of full voltage AC input, it is difficult to realize CS sampling resistor short circuit protection; 2. In In the process of mass production, due to the difference in the peripheral application parameters of the system, it is easy to accidentally trigger the short circuit protection of the CS sampling resistor
The above problems largely limit the application and promotion of CS sampling resistor short-circuit protection technology
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[0012] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0013] refer to figure 1 , is a schematic structural diagram of a CS sampling resistor short-circuit protection device for a switching power supply according to an embodiment of the present invention. The CS sampling resistor short-circuit protection device in the embodiment of the present invention includes a ramp wave generation module 1 , a slope detection module 2 , an off time setting module 3 , a timing module 4 , a counting module 5 and a control module...
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The invention discloses a switch power supply CS sampling resistor short circuit protective device; an oblique wave forming module forms oblique wave signals according to an AC input voltage when a power tube is conducted, and sends an abnormity conduction indication signal; a slope detection module sends a short circuit alarm signal when a sample signal rising slope is smaller an oblique wave signal rising slope; a switch off time setting module sends a switch off indication signal according to the short circuit alarm signal; a counting module sends a switch off control signal when the reception frequency of the short circuit alarm signal reaches a preset frequency in a sending period of a timing module; a control module controls the power tube to conduct according to the short circuit alarm signal, so the power tube can be conducted according to the smaller value of the following two: the normal conduction time and abnormal conduction time; the power tube can be switched off according to the bigger value of the following two: the normal switch off time and the abnormal switch off time; the control module can control the power tube to switch off and lock the switch off state according to the switch off control signal. The protective device can provide reliable short circuit protection for a CS sampling resistor under the full voltage AC input conditions.
Description
technical field [0001] The invention relates to the technical field of power supplies, in particular to a CS sampling resistor short-circuit protection device for a switching power supply. Background technique [0002] With the increasing demand for switching power supplies, reducing production costs, increasing application functions, and optimizing performance have become the basic requirements for the power supply of general consumer electronics products. [0003] Since there are many factors in the production, testing and use of the switching power supply, some components in the system may be damaged or short-circuited, thereby causing safety hazards to the normal operation of the switching power supply. In the case of damage or short circuit, self-protection or non-operation, thereby further improving the safety of the switching power supply system. For example, in a switching power supply application system, if the CS sampling resistor is damaged or the CS sampling res...
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IPC IPC(8): H02H7/12
CPCH02H7/1203
Inventor 唐波许刚颍王建辉向磊马强
Owner 成都启臣微电子股份有限公司