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Switch controller suitable for switching-type power supply and method thereof

A technology of switch controller and switching power supply, which is applied in the direction of control/regulation systems, instruments, electrical components, etc., which can solve problems such as lock-up, inconvenience for users, and failure of the switch controller to operate normally, so as to avoid the phenomenon of lock-up Effect

Active Publication Date: 2011-08-03
LEADTREND TECH
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AI Technical Summary

Problems solved by technology

[0003] However, when the auxiliary winding generates a negative voltage, since the auxiliary voltage may enter the switching controller, the switching controller will directly receive the negative voltage
In this way, a latch-up phenomenon may occur in the switch controller, so that the switch controller cannot operate normally, causing inconvenience to users

Method used

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  • Switch controller suitable for switching-type power supply and method thereof
  • Switch controller suitable for switching-type power supply and method thereof
  • Switch controller suitable for switching-type power supply and method thereof

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Embodiment Construction

[0072]In view of this, the present invention provides a switch controller coupled to the auxiliary winding through a detection resistor, and the switch controller receives a detection signal transmitted from the detection resistor. The switch controller of the present invention provides a detection current to flow through the detection resistor, so as to maintain the detection signal transmitted by the detection resistor above a specific voltage (such as 0V), so as to prevent the switch controller from malfunctioning due to receiving a negative voltage. A latch-up phenomenon occurs. In addition, the switch controller of the present invention can detect the magnitude of the input voltage by detecting the current, and control the operation of the power switch and the switch mode power supply accordingly.

[0073] figure 1 It is a switch controller 100 implemented according to the present invention, which is suitable for a switch mode power supply 101 with a boost converter (boo...

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Abstract

The invention relates to a switch controller suitable for a switching-type power supply and a method thereof. The switch controller is coupled to one auxiliary winding of the switching-type power supply by a detecting resistor; the switch controller provides detecting current which flows through the detecting resistor so as to keep one detecting signal transmitted by the detecting resistor above the specific voltage; and thus, the latching phenomenon generated because the switch controller receives the detecting signal of negative voltage can be avoided. In addition, the switch controller is characterized in that one input voltage of the switching-type power supply is detected by the detecting current so as to control the switching-type power supply to operate.

Description

technical field [0001] The present invention relates to a switch controller, and more particularly, to a switch controller suitable for a switch mode power supply. Background technique [0002] In a switching power supply with AC / DC conversion, to detect the state of energy storage in the primary winding, a commonly used method is through an auxiliary winding. By detecting the cross-voltage of the auxiliary winding, the switch controller determines the timing of turning on and turning off the power switch. For example, when the switching mode power converter is used for power factor correction (Powerfactor correction, PFC), an operation mode is to provide a fixed on-time of the power switch, and when the main winding of the energy conversion After the energy is completely exhausted, the power switch is turned on. Among them, when the stored energy in the main winding is exhausted, the voltage of the auxiliary winding will start to oscillate, and gradually drop from positiv...

Claims

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Application Information

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IPC IPC(8): H02M3/335
Inventor 吴宗修叶文中庄明男
Owner LEADTREND TECH
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