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Multi-path output power supply

A multi-channel output and power supply technology, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the safety problems of high transformer temperature, high duty cycle of power supply, and failure to pass safety regulations. Problems such as output overcurrent or short circuit fault cannot be detected correctly, so as to achieve the effect of improving electromagnetic compatibility characteristics and simple circuit

Active Publication Date: 2008-08-13
VERTIV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] When we use one auxiliary output to detect the output voltage of multiple outputs for protection, since there may be output circuits with small currents in other auxiliary output circuits, the output will be over-current due to the presence of large line resistance and internal resistance during short circuit or overcurrent. Insufficient flow or short-circuit current makes the duty cycle of the power supply to the maximum, and the transformer cannot pass the safety regulations due to the high temperature of the winding or there are safety problems, or the overheating of the PCB wiring leads to the existence of other safety problems
[0009] When the input voltage range is wide, the duty cycle of all outputs with the lowest input voltage at full load is greater than the duty cycle of one output in over-current or short-circuit state when the input voltage is higher, and the other output circuits are in light load, using the method of voltage detection can not correctly detect the output overcurrent or short circuit fault
[0010] For a circuit that adopts an over-current protection method for a certain output voltage detection method, when the over-current is detected, the over-current fault of this circuit cannot be detected.

Method used

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specific Embodiment approach 1

[0050] Such as figure 2 The multi-output power supply shown includes a transformer T1 , a voltage detection and comparison module 2 , and a power control module 3 . The transformer T1 has four windings, namely the first primary winding T1a, the second primary winding T1b, the first secondary winding T1c and the second secondary winding T1d. Among them, the first primary winding T1a corresponds to the input of the transformer T1, the second primary winding T1b, the first secondary winding T1c and the second secondary winding T1d correspond to the three output circuits of the transformer T1, which are Vo1 and Vo2 respectively. and Vo3 Road. Among them, Vo1 and Vo2 are auxiliary output roads, and they are also the output roads that we need to perform over-current or short-circuit protection. Vo3 road is the third output road, which can be the main output road or other auxiliary output roads.

[0051] We add a two-winding transformer in series in the output circuit before the r...

specific Embodiment approach 2

[0090] Such as Figure 4 As shown, the difference between this specific embodiment and specific embodiment 1 is that the multi-output power supply in this specific embodiment is a buck-type directional voltage regulation multi-output power supply. The current inflow ends of the first winding L1a and the second winding L1b have the same name as each other, that is, the magnetic fluxes generated by the two currents in the magnetic core of the transformer have the same direction, and the magnetic fluxes add up. The current inflow end of the detection winding L1c and the current inflow ends of the first winding L1a and the second winding L1b are opposite ends of each other.

[0091] After adding the transformer L1, the output voltage of Vo1, Vo2 and Vi voltage are respectively:

[0092] Vo1=ULs1(1-Ds)-AL×Na(Nb×ΔILs2+Na×ΔILs1)

[0093] Vo2=ULs2(1-Ds)-AL×Nb(Na×ΔILs1+Nb×ΔILs2)

[0094] Vi=AL×Nc(Nb×ΔILs2+Na×ΔILs1)

[0095] It can be seen from the above formula that the output volt...

specific Embodiment approach 3

[0100] Such as Figure 5 As shown, the difference between this specific embodiment and specific embodiment 1 is:

[0101] In this specific embodiment, a transformer with four windings is added, and the transformer includes a first winding L1a, a second winding L1b, a detection winding L1c and a third winding L1d, wherein the first winding L1a of the transformer is connected in series with the first auxiliary On the output path (Vo1 path), the second winding L1b is connected in series with the second auxiliary output path (Vo2 path), and the third winding L1d is connected in series with the third auxiliary output path (Vo3 path).

[0102] Apparently, by utilizing the technical idea of ​​the present invention, it is also possible to perform directional voltage regulation on the output of more than three auxiliary output channels and at the same time perform overcurrent or short circuit protection.

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Abstract

The invention discloses a multi-path output power supply, comprising a transformer having at least two output paths, a power supply control module and a voltage detection comparing module. The at least two output paths comprise a main output path and an assistant output path. The output end of the power supply control module is connected to the input end of the transformer through the switch pipe. The output end of the voltage detection comparing module is connected to the input end of the power supply control module; further comprising a mutual inductor comprising a detecting winding connected to one input end of the voltage detection comparing module and an output path winding connected in series to at least two output paths. The circuit of the invention is extremely simple without complex circuits, for example, reference source, and comparator and without adding apparatus such as resistor which brings loss. The invention not only processes overcurrent or short-circuit protection simultaneously for multi-path output, but also processes overcurrent protection for the main output path and all assistant output paths simultaneously.

Description

technical field [0001] The invention relates to a power supply circuit, in particular to a multi-channel output power supply. Background technique [0002] At present, in the multi-output power supplies used in the industry, the main output channel is the output channel with negative feedback, which is relatively stable in performance and has high voltage regulation accuracy, while the other auxiliary output channels without feedback have poor performance and low voltage regulation accuracy. is not high, so the output with the largest current or the highest importance is generally output as the main output. The remaining small current output channels are used as auxiliary output channels. At present, the industry's requirements for safety regulations are becoming more and more formal. Each output of a multi-output power supply generally needs to be tested for overload and short circuit. It is also thinner, and the wire resistance will be larger. In addition, the PCB traces...

Claims

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Application Information

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IPC IPC(8): H02M7/48H02M7/483H02M3/28
Inventor 吴连日
Owner VERTIV CORP
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