A design method for starting and regulating DC power supply based on dc/dc module 0V
A design method and technology of DC power supply, applied in conversion equipment without intermediate conversion to AC, adjustment of electrical variables, control/regulation systems, etc., can solve problems such as low efficiency, inability to achieve 0V start-up adjustment, and increasing heat dissipation devices, etc. Achieve high efficiency, wide device selection, and small size
Active Publication Date: 2021-01-12
ANHUI EGRETS ELECTRONICS TECH
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Problems solved by technology
[0004] The 0V adjustable voltage source provided on the market is based on the switching power supply method, which converts the AC power to the required DC voltage, and then uses the linear power supply device to adjust the 0V adjustable DC power supply required for output. This method takes up more space. Large, low efficiency, and additional heat dissipation devices are required, which cannot meet the volume requirements of the equipment; the use of DC / DC devices can improve efficiency, but the minimum output voltage of all DC / DC devices on the market has Vref limit, it is not possible to achieve 0V start-up
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[0029] Such as figure 2 As shown, a design method for starting and regulating the DC power supply based on the DC / DC module 0V, including a DC / DC module 1, a feedback loop 2 and a voltage regulation port 3, and the DC / DC module 1 is connected through the FB pin The feedback voltage is pulse-modulated, the switching tube is turned on / off, and the output voltage is adjusted. The input voltage of the voltage regulation port 3 and the output voltage of the DC / DC module 1 are fed back to the FB pin of the DC / DC module 1 through the feedback loop 2 together. , the DC / DC module 1 adjusts the output voltage through its own negative feedback until the voltage of the FB pin reaches the set value.
[0030] Such as figure 1 , 2 As shown, the feedback loop 2 includes operational amplifier one U1, operational amplifier two U2 and operational amplifier three U3, the output voltage terminal of the DC / DC module is connected to one end of the resistor R1, and the other end of the resistor R1...
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The invention discloses a design method of a tuning-from-0 V direct-current power supply based on a DC / DC module. The DC / DC module performs pulse modulating via feedback voltage from FB pin; a switchtube is opened / closed; output voltage is adjusted; input voltage of a voltage adjusting port and output voltage of the DC / DC module are fed by a feedback loop back to the FB pin of the DC / DC module; the output voltage is adjusted via autonomous negative feedback of the DC / DC module until the FB pin voltage reaches a set value. The design herein is based on a DC / DC device; a circuit set up with multiple operational amplifiers is used as a direct-current power supply feedback loop, so that the direct-current power supply can be tuned from 0 V; the feedback loop is simple and easy to implement; equipment in the design method can be used to provide digital control under higher control precision; the equipment is also suitable for remote control and supervision.
Description
technical field [0001] The invention relates to the technical field of power supply realization, in particular to a design method for starting and regulating a DC power supply based on a DC / DC module at 0V. Background technique [0002] DC / DC is a kind of switching power supply, which refers to the conversion of DC to DC, and its core is a DC / DC converter. A power supply that maintains a stable output voltage by controlling the turn-on and turn-off time ratio of the switch tube. The DC / DC device is generally composed of a pulse width controller (PWM) circuit and a MOSFET. At present, DC / DC is widely used in almost all electronic devices due to its small size, light weight and high efficiency. [0003] In the development of equipment, a 0V adjustable DC power supply with a small size that can be installed inside the equipment is needed to meet the needs of customers. [0004] The 0V adjustable voltage source provided on the market is based on the switching power supply meth...
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IPC IPC(8): H02M3/04H02M3/156
CPCH02M3/04H02M3/156
Inventor 郭庆王慧梅
Owner ANHUI EGRETS ELECTRONICS TECH