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Power supply and power supply method with circulation current compensation

A technology of circulating current and power supply, which is applied in the direction of inverting conversion equipment, electrical components, and output power conversion devices, etc., can solve the problem of expensive Hall current sensors.

Active Publication Date: 2019-08-23
HUAWEI DIGITAL POWER TECH CO LTD
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  • Description
  • Claims
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Problems solved by technology

However, this method also has disadvantages, because the Hall current sensor is a rather expensive component

Method used

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  • Power supply and power supply method with circulation current compensation
  • Power supply and power supply method with circulation current compensation
  • Power supply and power supply method with circulation current compensation

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Embodiment Construction

[0032] First refer to figure 1 Demonstrate the structure of a switching power supply. refer to figure 2 , which further explains the problem of circulating current. refer to image 3 -5, describes the structure and function of different embodiments of the power supply according to the first aspect of the present invention. refer to Figure 6 and Figure 7 , showing the results achievable using the present invention. Finally, along the Figure 8 , illustrating the functionality of an embodiment of the method according to the second aspect of the invention. Similar entities and reference numerals in different figures have been partially omitted.

[0033] figure 1 An embodiment of a power supply 1 is shown in . The power supply 1 includes an inverter 2 having a positive voltage rail 31 , a negative voltage rail 32 and a plurality of switches 21 - 28 . Each of the switches 21 - 28 may be implemented as a parallel connection of a transistor and a diode. Furthermore, po...

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Abstract

A power supply (1) for generating an output signal (OUT) is provided. The power supply (1) comprises a first inverter leg (11) and a second inverter leg (12), respectively adapted to generate a firstpulse width modulation signal (PWM1) and a second pulse width modulation signal (PWM2) by modulating an input DC voltage (IN). Moreover, the power supply (1) comprises a phase shifter (120), which isadapted to generate a provisional second pulse width modulation signal (PWM2') by phase shifting a signal (PWM1CTRL), which the first pulse width modulation signal (PWM1) is derived from. Furthermore,the power supply (1) comprises a compensator (121), which is adapted to determine the second pulse width modulation signal (PWM2) from the provisional second pulse width modulation signal (PWM2'). Especially, the compensator (121) adds a compensation signal during the generating of the second pulse width modulation signal (PWM2). Finally, the power supply (1) comprises a coupled inductor (13), which is adapted to combine the first pulse width modulation signal (PWM1) and the second pulse width modulation signal (PWM2) to form the output signal (OUT).

Description

technical field [0001] The present invention relates to switching power supplies. Background technique [0002] In a switching power supply, using more than one switching branch can improve efficiency and reduce hardware cost. When combining the signals generated by more than one switching leg in a coupled inductor, circulating currents may result. These circulating currents cause the magnetic saturation of the coupled inductor, resulting in coupling loss. Therefore, it is important to prevent such circulating currents within the coupled inductor. [0003] An example solution to this problem is to provide Hall current sensors in each switching branch in order to measure the current in each switching branch. In this way, the presence of circulating currents can be determined and counteracted. However, this method also has disadvantages, since the Hall current sensor is a rather expensive component. Contents of the invention [0004] It is therefore an object of the pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12H02M1/40H02M7/81H02M7/493H02M7/5387
CPCH02M1/126H02M1/40H02M7/483H02M7/493H02M1/0043Y02B70/10H02M7/043H02M7/5395
Inventor 方晓厅刘志华
Owner HUAWEI DIGITAL POWER TECH CO LTD
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