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Double-power supply convertor

A dual power supply and converter technology, applied in the output power conversion device, the irreversible AC power input is converted into DC power output, and the AC power input is converted into AC power output, etc., which can solve the problem of large output ripple, oscillation, The problem of long discharge time of the secondary side capacitor, etc., achieves the effect of strong adaptability, high reliability and simple structure

Active Publication Date: 2010-11-03
EMERSON NETWORK POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The output voltage of high-voltage DC UPS is 5 times or even higher than that of the previous 48V system. Although the second-level auxiliary power supply can still adopt the original scheme of sharing the same primary winding with two voltage inputs, when the high-voltage input is used, the second converter The duty cycle is very small, which is easy to cause intermittent oscillation, and at this time, the discharge time of the secondary capacitor is long, and the output ripple is large.
Therefore, the original second converter is not suitable for occasions with a wide input voltage range

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0018] Flyback dual-supply converters, such as figure 1 As shown, it includes a voltage input circuit, a transformer and a voltage output circuit. The transformer includes a primary winding and a secondary winding. The voltage input circuit includes two voltage input terminals, a higher voltage input terminal HV and a lower voltage input terminal LV, and a switch tube S1 , The voltage selection circuit, the voltage selection circuit is realized by the diode D1 and the diode D2. The voltage selection circuit selectively connects the higher voltage of the two voltage input terminals of the high voltage input terminal HV and the lower voltage input terminal LV to the primary winding and the switch tube S1; specifically, when the voltage of the high voltage input terminal HV When the voltage of the lower voltage input terminal LV is higher than the voltage of the lower voltage input terminal LV, the diode D1 is turned on, and the diode D2 is cut off, so that the higher voltage inp...

Embodiment 2

[0021] Flyback dual-supply converters, such as figure 2 As shown, this embodiment is basically the same as Embodiment 1, except that the primary winding B is tapped from the primary winding A.

Embodiment 3

[0023] Forward dual-supply converters, such as image 3 As shown, this embodiment is basically the same as Embodiment 1, except that this circuit is a flyback converter with a reset winding Nr.

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Abstract

The invention discloses a double-power supply convertor, the primary side of which is provided with a primary winding A and a primary winding B; a voltage selection circuit of the double-power supply convertor is used for leading the voltage input at a higher voltage input end to be switched on with the primary winding A with a larger number of turns, or leading the voltage input at a lower voltage input end to be accounted into the primary winding B a smaller number of turns, so that higher duty ratio can be still maintained when the voltage of the higher voltage input end is input into the convertor, and the technical problem that intermittent oscillation and large output ripple are easily caused can be solved. The double-power supply convertor has simple structure, strong adaptivity, high reliability and low cost.

Description

technical field [0001] The invention relates to a converter powered by dual power sources, in particular to a converter used in a communication base station. Background technique [0002] The power supply of the communication base station power supply system usually includes the first auxiliary power supply and the second auxiliary power supply (also called the second converter), where the second converter is powered by one output of the first auxiliary power supply and two power supplies of the system busbar , the two take the higher voltage as the input voltage, so that the module can ensure normal communication when the PFC of the first auxiliary power supply or the output of the DCDC converter fails. In the previous communication base station system power supply, the two input voltages of the second converter have little difference, which can be realized by one winding of the same transformer. [0003] Compared with traditional AC UPS, high-voltage DC UPS can significan...

Claims

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Application Information

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IPC IPC(8): H02M7/06H02M5/275
Inventor 张超华吕华军王瑛阎天勇董亚武
Owner EMERSON NETWORK POWER CO LTD