Low voltage undervoltage direct through voltage protection current limiting circuit
An overvoltage protection and current limiting circuit technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, protection reacting to overvoltage, etc. Such problems as damage to electronic products, charging circuit without current limiting and overvoltage protection functions, etc., are beneficial to environmental protection and resource saving.
Active Publication Date: 2014-10-22
SZBROAD TECH
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Problems solved by technology
[0002] Existing consumer electronic products are widely used, such as smart phones and GPS navigators, etc., which bring many conveniences to people's lives, but subsequently, due to the fast power consumption of consumer electronic products, the need to charge them anytime, anywhere The problem has become a key issue. The existing charging circuit generally does not have the function of current limiting and overvoltage protection. Therefore, it is easy to cause damage to consumer electronics products when charging in different environments. Therefore, it is necessary to design a new charging circuit. Low voltage undervoltage direct through voltage protection current limiting circuit
Method used
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Embodiment 1
[0028] Such as figure 1 As shown, a low-voltage undervoltage direct overvoltage protection current limiting circuit includes a P-channel MOS transistor Q10 and four NPN transistors Q11, Q12, Q13 and Q14;
[0029] The S pole of the MOS transistor Q10 is connected to the positive input terminal Vin of the low-voltage undervoltage direct pass-through voltage protection current limiting circuit, and the D pole of the MOS transistor Q10 is connected to the positive output terminal Vout of the low-voltage undervoltage direct pass-through voltage protection current limiting circuit through the resistor R18; A resistor R19 is connected between the G pole of the tube Q10 and Vin;
[0030] Resistor R22 and resistor R26 are connected in series to form the first voltage dividing branch, and resistor R22 is connected to Vin, and R26 is grounded; the voltage dividing point of the first voltage dividing branch is connected to the B pole of Q13; the C pole of Q13 is connected to Vin; t...
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The invention discloses a low-voltage and under-voltage shoot-through over-voltage protective current limiting circuit. The low-voltage and under-voltage shoot-through over-voltage protective current limiting circuit comprises a P-channel MOS (Metal Oxide Semiconductor) tube Q10 and 4 NPN (Negative-Positive-Negative) type triodes Q11, Q12, Q13 and Q14 and further comprises a plurality of resistors at the periphery; in the low-voltage and under-voltage shoot-through over-voltage protective current limiting circuit disclosed by the invention, the P-channel MOS tube is used as a main control device of the circuit, input of the MOS tube can be shut off when the voltage is overhigh and the voltage is shoot-through when the voltage is under-voltage; and meanwhile, a current limiting effect is also obtained, so that a product and a power supply are protected. Limitation of a charging input end is reduced and convenience for a user to use more chargers can be achieved. Therefore, the low-voltage and under-voltage shoot-through over-voltage protective current limiting circuit disclosed by the invention integrates a low-voltage and under-voltage shoot-through function, an overvoltage protection function and a current limiting function and has the advantages of simple circuit, wide voltage input range and stable circuit output voltage.
Description
technical field [0001] The invention relates to a low-voltage under-voltage direct through-voltage protection current-limiting circuit, which is suitable for consumer electric and electronic products, such as GPS navigators and the like. Background technique [0002] Existing consumer electronic products are widely used, such as smart phones and GPS navigators, etc., which bring many conveniences to people's lives, but subsequently, due to the fast power consumption of consumer electronic products, the need to charge them anytime, anywhere The problem has become a key issue. The existing charging circuit generally does not have the function of current limiting and overvoltage protection. Therefore, it is easy to cause damage to consumer electronics products when charging in different environments. Therefore, it is necessary to design a new charging circuit. Low voltage undervoltage direct through voltage protection current limiting circuit. Contents of the invention [00...
Claims
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IPC IPC(8): H02H3/20H02H9/02
Inventor 李子菏
Owner SZBROAD TECH