Auxiliary power source generating circuit
A technology for generating circuits and auxiliary power, applied to electrical components, conversion equipment without intermediate conversion to AC, output power conversion devices, etc., can solve problems such as overheating of related components, exceeding safety regulations, and inability to ensure the stability of auxiliary DC power. , to achieve the effect of stable output
Inactive Publication Date: 2013-07-10
牛昌和 +1
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Problems solved by technology
However, the auxiliary DC power generated by the general auxiliary power supply circuit usually has a large current. Excessive current will not only cause unnecessary loss, but also easily cause the above-mentioned control integrated circuit and its related components to overheat.
In addition, if the power input terminal (AC input terminal) changes greatly, the above implementation cannot ensure the stability of the auxiliary DC power
However, although there is an integrated circuit (IC) dedicated to generating the auxiliary DC power supply, the above-mentioned integrated circuit is still unable to generate the auxiliary DC power supply of a small current, exceeding the safety specification
Method used
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[0023] Detailed description and technical contents of the present invention are now described as follows in conjunction with the accompanying drawings:
[0024] see figure 2 , the auxiliary power supply generating circuit of the present invention is applied in a filter power supply circuit, the filter power supply circuit is connected to a bridge rectifier circuit BD1 that accepts an external AC power source for power conversion, and has a main working power output terminal that outputs main working power PL1 and a ground terminal GND. The auxiliary power generation circuit has a first voltage stabilizing capacitor C1 connected to the main working power output terminal PL1, and the other end of the first stabilizing capacitor C1 is connected to a first Diode D1, and the first diode D1 is connected to a second voltage stabilizing capacitor C2, and the other end of the second voltage stabilizing capacitor C2 opposite to the first diode D1 is connected to the ground terminal G...
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The invention provides an auxiliary power source generating circuit and is applied for a filtering power source circuit. The auxiliary power source generating circuit is provided with a first voltage-stabilizing capacitor, a second voltage-stabilizing capacitor and a capacitance bleeder circuit, wherein the second voltage-stabilizing capacitor is connected with the first voltage-stabilizing capacitor through a first diode, and the first voltage-stabilizing capacitor and the second voltage-stabilizing capacitor form the capacitance bleeder circuit. A first connecting point between the first voltage-stabilizing capacitor and the first diode is connected with a short-circuit component and a second diode, wherein the electric current communication direction of the second diode is opposite to that of the short-circuit component. The short-circuit component is provided with a control end, the short-circuit component is connected with a first zener diode through the control end, the first zener diode is further connected with a first resistor of a appropriate resistance value, the first resistor is further connected to a second connecting point between the second voltage-stabilizing capacitor and the first diode. Auxiliary direct current electric power with small electric current is offered, the auxiliary power source generating circuit is not affected by external alternating current electric power variation and still can steadily output the auxiliary direct current electric power.
Description
technical field [0001] The present invention relates to an auxiliary power generation circuit, in particular to a power factor correction circuit capable of providing auxiliary direct current power for high-voltage side switches, integrated circuits for controlling LED lighting, or integrated circuits for controlling motors. Background technique [0002] In addition to the main working power supply, at least one low-voltage auxiliary DC power is needed when the integrated circuit is powered on. However, in order to obtain the above-mentioned auxiliary DC power during the powered-on operation, a general integrated circuit will arrange an auxiliary DC power in the integrated circuit. power circuit to generate auxiliary DC power. [0003] There are many methods for generating the above-mentioned auxiliary DC power supply, and there are different implementation modes corresponding to different circuits. For example, for the auxiliary DC power of an integrated circuit that contr...
Claims
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Login to View More IPC IPC(8): H02M7/217H02M3/07
CPCH02M1/0006
Inventor 牛嶋昌和
Owner 牛昌和