Protection circuit and power source supply system
A technology for protecting circuits and circuits, applied in emergency protection circuit devices, electrical components, output power conversion devices, etc., can solve problems such as Vout fluctuation hiccups, load performance and system stability, and achieve performance improvement and eliminate hiccups The effect of the phenomenon
Pending Publication Date: 2018-03-23
HANGZHOU BOON ELECTRONICS CO LTD
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Problems solved by technology
[0003] On the other hand, in reality, due to some noise or other influences on the load or other components in the power supply system, when the switch of the power circuit is cut off, the output terminal of the power circuit still has a phenomenon of periodic milliampere-level current output , the current flowing to the load makes the output voltage Vout non-zero, and there is a hiccup phenomenon of periodic fluctuations of Vout, such as image 3 As shown, when the switch of the power circuit is turned off, the output voltage has a periodic hiccup voltage of up to 5V
This hiccup affects load performance and system stability
Method used
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[0021] In order to further understand the present invention, the preferred embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only to further illustrate the features and advantages of the present invention, rather than limiting the claims of the present invention.
[0022] The description in this part is only for several typical embodiments, and the present invention is not limited to the scope of the description of the embodiments. The mutual replacement of the same or similar prior art means and some technical features in the embodiments is also within the scope of the description and protection of the present invention.
[0023] "Coupling" in the specification includes direct connection and indirect connection, such as connection through an electrically conductive medium such as a conductor, wherein the electrically conductive medium may contain parasitic inductance or parasitic capac...
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The invention provides a protection circuit. The circuit comprises a comparison circuit, a protection signal generation circuit and a current absorption circuit; the comparison circuit is provided with a first end and a second end; the first end of the comparison circuit is coupled to the output end of a power source circuit and is used for receiving a voltage signal which characterizes the outputvoltage of the output end of the power source circuit; the second end of the comparison circuit is used for receiving a reference voltage signal; the protection signal generation circuit is providedwith an input end and an output end; the input end of the protection signal generation circuit is coupled to the output end of the comparison circuit; the output end of the protection signal generation circuit is used for providing a protection signal; when the output voltage meets a predetermined condition, the protection signal is in an active state and is used for turning off the power source circuit; and the current absorption circuit is coupled to the protection signal generation circuit and the output end of the power source circuit; and when the protection signal turns off the power source circuit, the current absorption circuit is used for conducting absorption current to bring the output voltage closer to zero. According to the protection circuit and system, the snoring phenomenonof the output voltage under a switching protection turn-off state can be eliminated, and the performance and stability of the system can be improved.
Description
technical field [0001] The invention relates to the field of electronic circuits, in particular to a protection circuit for a power supply system. Background technique [0002] In the field of power supplies, power circuits are used to supply power to loads. On the one hand, in order to protect the normal operation of the load, when the output voltage is abnormal, such as when the output voltage is lower than a predetermined value, the switch in the power circuit is often cut off to stop supplying power to the load. [0003] On the other hand, in reality, due to some noise or other influences on the load or other components in the power supply system, when the switch of the power circuit is cut off, the output terminal of the power circuit still has a phenomenon of periodic milliampere-level current output , the current flowing to the load makes the output voltage Vout non-zero, and there is a hiccup phenomenon of periodic fluctuations of Vout, such as image 3 As shown in ...
Claims
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Login to View More IPC IPC(8): H02H7/12H02M1/32
CPCH02H7/1203H02M1/32
Inventor 俞朝阳
Owner HANGZHOU BOON ELECTRONICS CO LTD