Overload protection circuit of boost DC/DC converter
A technology of overload protection circuit and DC converter, which is applied in the direction of emergency protection circuit device, emergency protection circuit device, circuit device, etc. for limiting overcurrent/overvoltage, and can solve the problem that the DC/DC converter power tube cannot be boosted. Reliable protection, increased power consumption, permanent damage to power tubes, etc.
Active Publication Date: 2021-11-12
WUXI CRYSTAL SOURCE MICROELECTRONICS CO LTD
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Problems solved by technology
In practical applications, the power tube (boost freewheeling PMOS tube) of the boost DC / DC converter has a weak ability to withstand large currents. In abnormal conditions such as overload or output short circuit, the power tube will flow a large current And the resulting power consumption increases rapidly, resulting in permanent damage to the power tube
In the overload protection circuit of the existing step-up DC / DC converter, when the output is overloaded or short-circuited, it can only realize that the current flowing through the power tube does not exceed the set maximum output current, and it is impossible to fundamentally avoid the permanent damage of the power tube. Damage, that is, the power tube of the boost DC / DC converter cannot be reliably protected
Method used
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[0047] The present invention will be described in detail below in conjunction with the implementations shown in the drawings, but it should be noted that these implementations are not limitations of the present invention, and those of ordinary skill in the art based on the functions, methods, or structural changes made by these implementations Equivalent transformations or substitutions all fall within the protection scope of the present invention.
[0048] Such as figure 1 As shown, it includes a boost freewheeling PMOS tube (power tube), the source s of the boost freewheeling PMOS tube is connected to the switch terminal SW of the boost DC / DC converter, and the drain d is connected to the boost DC / DC converter The output terminal Vout of the tor, including:
[0049] An overload detection unit 101, the first signal input terminal of the overload detection unit is connected to the switch terminal SW, the second signal input terminal is connected to the output terminal Vout of...
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The invention relates to an overload protection circuit of a boost DC / DC converter. The overload protection circuit is characterized in that an overload detection unit is used for detecting and comparing terminal voltage of a change-over switch and output terminal voltage of a DC / DC converter, the signal output end of a gate drive switching unit is connected with the gate of a boost freewheeling PMOS tube, the first signal input end of the gate drive switching unit is connected with the normal boost control signal of a boost DC / DC converter, the second signal input end of the gate drive switching unit is connected with a current limiting control signal,. the gate drive switching unit is used for switching between the first signal input end and the second signal input end, and a substrate switching unit switches between a first substrate connection state and a second substrate connection state according to the input terminal (Vin) voltage and an output terminal (Vout) voltage comparison of the boost DC / DC converter. According to the invention, reliable overload protection can be realized for the power tube of the boost DC / DC converter.
Description
technical field [0001] The invention relates to an overload protection circuit of a step-up DC / DC converter. Background technique [0002] With the rapid development of microelectronics technology, step-up DC / DC converter circuits have been widely used in various electronic products such as mobile phones. In practical applications, the power tube (boost freewheeling PMOS tube) of the boost DC / DC converter has a weak ability to withstand large currents. In abnormal conditions such as overload or output short circuit, the power tube will flow a large current And the resulting power consumption increases rapidly, resulting in permanent damage to the power tube. In the overload protection circuit of the existing step-up DC / DC converter, when the output is overloaded or short-circuited, it can only limit the current flowing through the power tube to not exceed the set maximum output current, and cannot fundamentally avoid the permanent damage of the power tube. Damage, that is,...
Claims
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IPC IPC(8): H02M1/32H02H7/122H02H9/02
CPCH02M1/32H02H7/122H02H9/025Y02B70/10
Inventor 王善喜
Owner WUXI CRYSTAL SOURCE MICROELECTRONICS CO LTD