Power supply voltage stabilization chip capable of improving AC wide-voltage input DC negative voltage output

Abstract

The invention discloses a power supply voltage stabilization chip capable of improving an AC wide-voltage input DC negative voltage output. A two-half wave AC power input pin, a working voltage outputpin and a DC negative voltage output pin are at least arranged, positive ends of a first energy storage capacitor and a second energy storage capacitor of an external circuit are connected with a neutral line of a power input end, and the chip comprises a first starting charging circuit, a second starting charging circuit and a third starting charging circuit. Since an inductor is not needed to be used, no EMI / EMC problem is generated, thus, the chip has the advantages of high safety and the like, is easy to process and maintain, the cost is reduced, the volume is reduced, and the chip can work at an ultrahigh-wide voltage.

Description

technical field [0001] The invention relates to a voltage stabilizing chip capable of improving AC wide voltage input and DC negative voltage output power supply. Background technique [0002] In the field of home appliance control boards, TRIAC thyristors are indispensable driving components, especially in the case of high-power thyristor components, in order to drive the thyristors correctly, the thyristors must work in quadrants II and III , to ensure complete triggering of the thyristor with the minimum trigger current. [0003] When traditional circuit design converts AC power into DC power, the following methods are often used: [0004] a. Transformer step-down method: [0005] Advantages: high cost, no EMI / EMC problems, large output current. [0006] Disadvantages: heavy weight, large volume, low efficiency, and the heating of silicon steel sheet does not meet the EU ERP standard. [0007] b. Switching power supply step-down method: [0008] Advantages: small siz...

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Problems solved by technology

[0006] Disadvantages: heavy weight, large volume, low efficiency, silicon steel sheet heating does not meet the EU ERP standard

[0009] Disadvantages: There are EMI / EMC problems, moderate cost, many peripheral components, and high heat generation of MOS tubes

[0012] Disadvantages: low efficiency, small output current, serious heating of resistors, does not meet EU ERP standards

[0015] Disadvantages: large size, low efficiency, easy aging of capacitor life and affected by temperature, does not meet the EU ERP standard, and the current limiting resistor is easy to break down and burn.

[0016] Among the above methods of converting AC power into DC power, the resistance-capacitance step-down method is the most commonly used method at present, such as figure 1 As shown, it is a circuit diagram using a resistance-capacitance step-down as a thyristor power supply. The input end of the circuit includes an AC power supply, which forms a series-parallel connection with a resistor and a capacitor, so that the AC power supply is composed of the capacitor and the capacitor. Resistors limit the maximum current. In addition, a rectifier circuit composed of two diodes is connected to rectify the AC current into a DC current, and then a zener diode and an electrolytic capacitor output a regulated DC power supply as a multiple The current of the gate DC trigger signal of the thyristor, due to the large size of the capacitor, causes troubles in assembly, and the capacitor is easy to age, so there is a limit to the service life, and even the resistor is in danger of being broken down and burned

[0017] However, in a kind of AC wide voltage input and DC negative voltage output power supply voltage stabilization chip available on the market, multiple capacitive energy conversions are used to convert positive voltage output into negative voltage output, such as figure 2 As shown, this will cause many disadvantages such as low energy conversion efficiency, too many external parts, and high cost.

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