Latch current limiting circuit
A current-limiting circuit and latching technology, applied in the field of protection circuits for aerospace power supplies, can solve the problems of reducing product service life and slow response, and achieve the effects of improving reliability, simple principle, and easy promotion.
Pending Publication Date: 2022-04-05
SHANGHAI INST OF SPACE POWER SOURCES
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Problems solved by technology
Discrete devices or protection chips are used as protection, and the response is slow. When the protection circuit does not respond, the device circuit operates with overcurrent, which will reduce the service life of the product to a certain extent.
Method used
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Embodiment Construction
[0039] based on the following Figure 1 to Figure 8 , specifically explain the preferred embodiment of the present invention.
[0040] Such as figure 1 As mentioned above, the present invention provides a latch current-limiting circuit that can be used for current-limiting protection at the input terminal of a power supply, including 15 resistors R sns , R 1 ~R 14 , 8 transistors Q 1 ~Q 8 , 3 Zener tubes Z 1 ~ Z 3 , 2 capacitors C delay 、C ss and a PMOS transistor Q 9 .
[0041] where the input resistance R sns Connected in series to the input positive line. The first resistor R 1 with the third transistor Q 3 series, the first resistor R 1 One end of the input resistor R sns One end of the connection, the first resistor R 1 The other end of the third transistor Q 3 The collector connection of the third transistor Q 3 The emitter is connected to the input negative line. The third triode Q 3 The collector is connected to the base. The first triode Q 1 , t...
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A latch current-limiting circuit comprises fifteen resistors, eight triodes, three voltage-regulator tubes, two capacitors and a PMOS (P-channel Metal Oxide Semiconductor) tube which are in circuit connection, the PMOS tube is conducted in a normal working state, and the latch current-limiting circuit outputs normally. When the input current is greater than the current-limiting value, the latch current-limiting circuit is converted from the normal working output state to the current-limiting output state. If the overcurrent phenomenon is eliminated within the delay time tdelay, the latch current-limiting circuit can be self-recovered and is immediately started in a current-limiting manner; and if the duration of the overcurrent phenomenon exceeds the delay time tdelay, the latch current-limiting circuit enters an output locking state, the PMOS tube is turned off, and the output voltage and the output current of the latch current-limiting circuit are reduced to zero. The method is simple in principle, practical, reliable and convenient to popularize, has an input overcurrent protection function, and improves the reliability of the single power supply.
Description
technical field [0001] The invention relates to the technical field of protective circuits for aerospace power supplies, in particular to a latch current-limiting circuit that can be used at power input terminals and has an input overcurrent protection function. Background technique [0002] The aerospace power system is usually divided into a power supply and distribution system and a secondary power conversion system. The secondary power conversion system converts the primary power bus into DC power required by each load through DC / DC. In the case of load overcurrent or short circuit, it will cause overcurrent at the input terminal of the secondary power supply, which will affect the reliability of the power supply and distribution system. In order to protect the single unit of the secondary power supply from damage and not affect the primary busbar of the power supply and distribution system, an overcurrent protection circuit generally needs to be set at the input end of ...
Claims
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Inventor 段永辉蔡婧璐张智芳王胜佳徐伟郑贤东沈昂王新征
Owner SHANGHAI INST OF SPACE POWER SOURCES