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Over-current protection and anti-latch-up circuit

A latch circuit and overcurrent protection technology, applied in the electronic field, can solve problems such as increased latch sensitivity, affecting normal operation of circuits, and increased risk of failure

Active Publication Date: 2018-02-16
SHENZHEN AEROSPACE NEW POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of CMOS circuits are used in modern satellites, and with the continuous reduction of microelectronic feature size, the latch-up sensitivity of many of them will also increase significantly, affecting the normal operation of the circuit and greatly increasing the risk of failure

Method used

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Embodiment Construction

[0020] Such as Figure 1-3 As shown, the present invention discloses an overcurrent protection and anti-latch circuit, including a switch circuit, a current sampling and current limiting circuit, an anti-latch hiccup circuit, a drive circuit and a power circuit. The overcurrent protection and anti-latch circuit The circuit also includes a resistor R29 and a transistor V3. The current sampling and current limiting circuit includes a resistor R4, a resistor R6, a capacitor C2, a pair of tubes V1, a resistor R7, a resistor R8, a resistor R*2, a resistor R9, a transistor V4, and a resistor R18. , the input end of the overcurrent protection and anti-latch circuit is respectively connected to one end of the resistor R29, one end of the resistor R6, and the A end of the resistor R4, and the B end of the resistor R4 is connected to one end of the resistor R*2, and the R * The other end of 2 is connected to the emitter of 2N3810-B of V1, the other end of the resistor R6 is connected to...

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Abstract

The invention provides an overcurrent protection and latch prevention circuit, which comprises an on-off circuit, a current sampling and limiting circuit, a latch burp prevention circuit, a drive circuit and a power circuit. The overcurrent protection and latch prevention circuit has the beneficial effect that an MOSFET is selected by the circuit as a protection switch to control connecting and disconnecting of an input end of equipment and a bus. After a load generates a latch phenomenon, current is limited at a specified value, and the latch phenomenon of the load is eliminated through energization and interruption for a few times. If the load is in an over-current or short-circuit fault, the current is limited at the specific value, and the circuit is finally cut off after energization and interruption for a few times, so that load equipment is effectively protected, and after the load equipment is normal, the circuit can rework through adding a startup instruction, and has the functions of a fuse and relay.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to an overcurrent protection and anti-latch circuit. Background technique [0002] The latch-up effect is a thyristor phenomenon of parasitic four-layer PNPN structure in the bulk silicon CMOS circuit, which is very easy to cause permanent failure of the circuit, and has serious consequences for satellite components. A large number of CMOS circuits are used in modern satellites, and with the continuous reduction of microelectronic feature size, the latch-up sensitivity of many of these circuits will also increase significantly, affecting the normal operation of the circuit and greatly increasing the risk of failure. Contents of the invention [0003] In order to solve the problems in the prior art, the present invention provides an overcurrent protection and anti-latch circuit. [0004] The invention provides an overcurrent protection and anti-latch circuit, including a switc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/20H03K17/082
CPCH02H7/205H03K17/0822
Inventor 程航张贤涛
Owner SHENZHEN AEROSPACE NEW POWER TECH
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