A dual-feedback short circuit protection device
A short-circuit protection and double-feedback technology, which is applied in emergency protection circuit devices, overcurrent-responsive protection, and electrical components, can solve problems such as increasing the loss of short-circuit protection circuits and reducing the reliability of switching power supplies. Wide range, strong capacitive load capacity, and low loss effect
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[0027] Figure 1 shows a short-circuit protection device with double-loop control, including a current detection circuit 21, a signal comparison circuit 22, and a short-circuit action circuit 23 connected in sequence; it also includes a compensation signal delay circuit 11 and a signal comparison circuit 12.
[0028] The following is a detailed description of the dual feedback short-circuit protection device in conjunction with Figure 2:
[0029] The VCC port provides a stable working voltage for the comparator, the COMP port is connected to the voltage compensation terminal of the pulse width modulation controller voltage feedback loop of the switching power supply, the ISENSE port is connected to the current sampling signal terminal of the switching power supply, and the CTL port is the protection signal output by the short circuit protection circuit , In the protection state, it is an inactive level, which can be used to drive a triode or a MOS tube to turn off the power supp...
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