专利汇可以提供Switching power supply circuit专利检索,专利查询,专利分析的服务。并且PURPOSE: To prevent a switching transistor from damaging by detecting the load current of the transistor and limiting the output current when this current exceeds predetermined value.
CONSTITUTION: A parallel circuit of a detecting resistor 23 and a capacitor 24 is inserted between the anode and ground of a flywheel diode 7, the cathode of a thyristor 25 is connected to the connecting point of the parallel circuit and the diode 7, and the anode of the thyristor is connected to the control terminal 13 of a pulse width modulating circuit 12. The detected voltage V
1 generated at both ends of the resistor 23 is proportional to the current flowing through the transistor 4 and substantially proportional to the load current. When the load current is increased to cause the detected voltage V
1 to exceed predetermined value, it turns off the thyristor 25 to thus stop the generation of switching pulse from the circuit 12 to thereby turn off the transistor 4. Thus, the output current is limited to thereby prevent the switching transistor from damaging due to the overload or load shortage.
COPYRIGHT: (C)1980,JPO&Japio,下面是Switching power supply circuit专利的具体信息内容。
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