Inductor discharge current detection circuit and power correction circuit
A detection circuit, inductive discharge technology, applied in the field of circuits, can solve the problems of complex detection circuit structure and other problems
Active Publication Date: 2015-07-29
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology
[0004] The main purpose of the present invention is to provide a detection circuit and a power correction circuit for the discharge current of the inductor, so as to solve the problem of complex structure of the detection circuit in the prior art when detecting the zero-crossing signal of the inductor current
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[0017] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0018] figure 1 is a schematic diagram of a detection circuit according to an embodiment of the present invention, such as figure 1 As shown, the detection circuit of this embodiment includes: an input terminal, an output terminal, a DC power supply VCC, a first current limiting resistor R1, a second current limiting resistor R3, a third current limiting resistor R4, a voltage dividing resistor R2, and an isolation diode D1 , Zener diode ZD, transistor and signal processor DSP ( figure 1 not shown in ), wherein the transistor is preferably a triode Q1 to reduce the production cost of the detection circuit.
[0019] Specifically, the input terminal is connected to the first end of the seconda...
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The invention discloses a detecting circuit of discharge current of an inductor and a power factor correction circuit. The detecting circuit comprises an input terminal, a direct-current power supply, a transistor, an output terminal and a signal processor. The input terminal is connected with a first end of a primary winding of the inductor and used for collecting the discharge current of the inductor. A first end of the transistor is connected with the input terminal, and a second end of the transistor is connected with the direct-current power supply. The output terminal is connected with a first node, and the first node is a node between the second end of the transistor and the direct-current power supply. The signal processor is connected with the output terminal and used for judging whether the discharge current is zero according to an output signal of the output terminal. By means of the detecting circuit, a problem in the prior art that a detecting circuit for detecting inductive current zero passage signals is complex in structure is solved, and a purpose of simplifying the detecting circuit structure and reducing production cost is achieved.
Description
technical field [0001] The invention relates to the field of circuits, in particular to a detection circuit and a power correction circuit of an inductor discharge current. Background technique [0002] In the prior art, the control scheme of the power correction circuit PFC (Power Factor Correction, referred to as PFC) needs to control the switching transistor to turn on to charge the inductor at the moment when the discharge current of the inductor is zero, so a related circuit is required to detect whether the inductor current is zero. At present, chips such as comparators are generally used to detect the current zero point, and the circuit structure is relatively complicated and the cost is high. At the same time, when the voltage difference between the target output voltage and the power supply input voltage is small, the energy storage and freewheeling effect of the inductor is weak, so there will be an abnormal zero-crossing signal of the inductor current at the cente...
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IPC IPC(8): G01R19/00H02M1/42
CPCY02B70/126Y02B70/10
Inventor 陈名才宋德超
Owner GREE ELECTRIC APPLIANCES INC