Overload protection circuit for step-up dc/dc converter
An overload protection circuit, DC converter technology, applied in the direction of emergency protection circuit device, emergency protection circuit device, circuit device for limiting overcurrent/overvoltage, etc., can solve the problem that the power tube of DC/DC converter cannot be boosted. Reliable protection, permanent damage to power tubes, weak bearing capacity, etc.
Active Publication Date: 2022-05-31
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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[0051] The substrate switching unit 105, the substrate switching unit is connected to the input terminal Vin, the output terminal of the boost DC / DC converter
[0054] As shown in FIG. 2, the overload detection unit is a hysteresis comparator, including a first PMOS tube to a third PMOS tube
[0055] The drain and gate of the first PMOS transistor MP101, the gate of the second MOS transistor MP102 and the first microchannel
[0057] As shown in FIG. 4 , the current limiting control unit includes the fourth to seventh PMOS transistors MP301 to MP304, the first
[0058] As shown in FIG. 5, the substrate switching unit includes an eighth PMOS transistor MP501 and a ninth PMOS transistor MP502, and a ratio of
[0059] The overload detection unit detects and compares the switch terminal SW voltage and the output terminal Vout voltage of the DC / DC converter
[0060] When the voltage of the output terminal Vout of the boost DC / DC converter is greater than the second threshold V2 of the vo...
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The invention relates to an overload protection circuit of a step-up DC / DC converter. The overload detection unit is used to detect and compare the switch terminal voltage and the output terminal voltage of the DC / DC converter; the signal output terminal of the gate drive switching unit is connected to the boost The gate of the freewheeling PMOS transistor, the first signal input terminal of the gate drive switching unit is connected to the normal boost control signal of the boost DC / DC converter, the second signal input terminal is connected to the current limiting control signal, and the gate drive switching unit is used switching between the first signal input terminal and the second signal input terminal; the substrate switching unit compares the voltage at the input terminal (Vin) and the voltage at the output terminal (Vout) of the step-up DC / DC converter, Toggle between a first substrate-attached state and a second substrate-attached state. The invention can realize reliable overload protection for the power tube of the step-up DC / DC converter.
Description
Overload Protection Circuit for Boost DC / DC Converter technical field [0001] The present invention relates to an overload protection circuit for a boost DC / DC converter. Background technique With the rapid development of microelectronics technology, boost DC / DC converter circuits have been widely used in various electrical in sub-products. In practical applications, the power tube (boost freewheeling PMOS tube) of the boost DC / DC converter has weaker resistance to large currents. Under abnormal conditions such as overload or output short circuit, the power tube will flow a large current and the power consumption will be extremely fast increase, resulting in permanent damage to the power tube. In the overload protection circuit of the existing boost DC / DC converter, when the output is over In case of load or short circuit, it can only limit the current flowing through the power tube not to exceed the set output maximum current, and cannot fundamentally To avoid pe...
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