Switch power supply with no-load power consumption of 3 milliwatts
A switching power supply and power consumption technology, which is applied to output power conversion devices, electrical components, regulating electrical variables, etc. and other problems, to achieve the effect of concise design, reduced no-load power consumption, low power consumption and high reliability requirements
Inactive Publication Date: 2013-07-17
HANGZHOU DIANZI UNIV
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Problems solved by technology
[0005] The second is the capacitive step-down (current limiting) type with intermediate efficiency
[0008] Precise theoretical calculations and a large number of actual tests have proved that the reason why the no-load power consumption of the switching power supply cannot be reduced to the milliwatt level is that one uses a power management chip with a large power consumption of its own, and the other is that the semiconductor components work at a quiescent current. state, the third is that the starting resistor consumes too much power
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[0015] The switching power supply with no-load power consumption of only 3 milliwatts will be described in detail below in conjunction with the accompanying drawings.
[0016] in the attached figure 1 , each functional box name description: 1. Input rectification filter circuit, 2. Start-up circuit, 3. Switch tube, 4. Positive feedback circuit, 5. Current sampling circuit, 6. Maximum output current limiting circuit, 7. Output voltage stability circuit, 8. photoelectric isolation circuit, 9. output voltage sampling circuit, 10. output rectification filter circuit.
[0017] attached below figure 1 , the function of each function box is briefly described:
[0018] 1. Input the rectification and filtering circuit to rectify the 220V mains and convert it to 310V DC through capacitor filtering. If the maximum output power of the power supply is very small, half-wave rectification can be used to further reduce power consumption.
[0019] 2. The start-up circuit provides the initia...
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The invention relates to a switch power supply with no-load power consumption of 3 milliwatts. The switch power supply comprises an input rectification filtering circuit, a starting circuit, a switch tube, a positive feedback circuit, a current sampling circuit, a maximum output current limiting circuit, an output voltage stabilization circuit, an optoelectronic isolation circuit, an output voltage sampling circuit and an output rectification filtering circuit, wherein the input rectification filtering circuit is used for rectifying a 220V mains supply and converting the 220V mains supply into a 310V direct current through a capacitance filter; the starting circuit is used for supplying an initial current for power supply oscillation starting; the current sampling circuit and the maximum output current limiting circuit are used for sampling and controlling a maximum output current of a power supply; the output voltage sampling circuit and the output voltage stabilizing circuit are used for sampling a secondary output voltage; and the output rectification filtering circuit is used for outputting high-frequency rectification filtering. By virtue of the switch power supply, not only is the working current requirement of a small power appliance, which works for 24 hours every day, met, but also the no-load power consumption is reduced to 3 milliwatts.
Description
technical field [0001] The invention belongs to the technical field of power supplies, and relates to a low-power switching power supply with no-load power consumption of only a few milliwatts. Background technique [0002] Any electrical appliance is inseparable from the power supply. Power sources fall into two broad categories: batteries and AC power. Among them, batteries are used for free-moving electrical appliances such as mobile phones, wireless microphones, MP3, remote controls, etc. Due to the environmental problems of batteries, high-power appliances usually choose the second type of power supply --- AC power supply. [0003] AC power supply can be divided into three specific forms: [0004] One is the most efficient resistive step-down (current limiting) type. Such as voice-activated lights and mechanical versions of electric fans, electric rice cookers, electric irons, power sockets, switch indicator lights, etc. (each indicator light and resistor consume a t...
Claims
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IPC IPC(8): H02M3/335
Inventor 刘敬彪霍洪强刘文方江晓袁欲晓
Owner HANGZHOU DIANZI UNIV