Time-delay circuit for outage of power source
A technology of delay circuit and power supply cut-off, which is applied in the field of power supply, can solve the problems of high cost, reduce volume, reduce the capacity and quantity of energy storage capacitors, etc., and achieve the goal of satisfying time, realizing delay function, and prolonging normal working time Effect
Inactive Publication Date: 2014-02-12
SHENZHEN ALLWINS TECH
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Problems solved by technology
In order to realize the DYING GASP function, the industry generally adopts supercapacitors (Farad capacitors), or connect many thousands of uF capacitors in parallel to realize the DYING GASP function; some devices have a high internal temperature, so it is necessary to find high temperature resistant (above 105 degrees) Supercapacitors, but there are basically no such capacitors in the current market; using multiple capacitors of several thousand uf in parallel occupies too much PCB area, and the cost is high; the purpose of the present invention is to provide energy storage solutions under low-voltage input power supply, improve The utilization rate of capacitor energy storage prolongs the normal working time of the system after power failure, thereby prolonging the DYING GASP reporting time, minimizing the capacity and quantity of energy storage capacitors, and ultimately reducing volume and cost
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[0013] The present invention solves the problem of low capacitor energy storage efficiency under low-voltage power supply input by using a booster module combined with a voltage detection module and an energy storage capacitor under low-voltage power supply input, and realizes the function of prolonging the normal working time of the system after power-off; The input power supply voltage is 5V as an example to introduce the working principle of the whole block diagram.
[0014] like figure 1 In one embodiment of the present invention, the power failure delay circuit includes a voltage detection module, a boost module, an energy storage switch, a DC-DC power conversion module, a circuit board, a diode D1, a current limiting resistor R1, a filter capacitor C1 and a storage Capacitor C2. The voltage detection module is connected with the input DC power supply and is used for detecting the state of the DC input power supply. The anode of the diode D1 is connected to the DC input...
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The invention provides a time-delay circuit for an outage of a power source. The time-delay circuit for the outage of the power source comprises a boost module, an energy storage capacitor, a voltage detection module, an energy storage switch and a direct current-direct current power source conversion module, wherein the boost module is used for boosting an input direct-current power source, the energy storage capacitor is connected with the boost module, the voltage detection module is used for detecting input voltage of the input direct-current power source, the energy storage switch is used for releasing the energy storage capacitor, and the direct current-direct current power source conversion module is connected with the energy storage switch and the direct-current power source. When the a power source detection module detects that the outage of the input direct-current power source occurs, the power source detection module controls the boost module to be closed and controls the energy storage switch to be closed so that the energy storage capacitor can provide electricity for the direct current-direct current power source conversion module. The time-delay circuit for the outage of the power source has the advantages of being small in size and low in cost.
Description
technical field [0001] The invention relates to the field of power supplies, in particular to a power failure delay circuit. Background technique [0002] The DYING GASP function of the power supply is the last word, which refers to reporting relevant information to the upper-level communication equipment when the power is turned off. Generally, it is required to keep it for about 20ms after the power is turned off, and to maintain this period of time for different functional circuits; currently there are many communication products. 5V or lower voltage power supply. In order to realize the DYING GASP function, the industry generally adopts supercapacitors (Farad capacitors), or connect many thousands of uF capacitors in parallel to realize the DYING GASP function; some devices have a high internal temperature, so it is necessary to find high temperature resistant (above 105 degrees) Supercapacitors, but there are basically no such capacitors in the current market; using mu...
Claims
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Inventor韦宁黄宁新
OwnerSHENZHEN ALLWINS TECH