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Method for controlling the input voltage frequency of a dc-dc convertor

A technology for controlling frequency and current converters, used in converter types, conversion of DC power input to DC power output, control/regulation systems, etc., and can solve problems such as inability to provide solutions

Pending Publication Date: 2021-03-05
RENAULT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, controlling the DC voltage at the input of an LLC DC to DC converter is a subject for which the prior art does not provide any satisfactory solution

Method used

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  • Method for controlling the input voltage frequency of a dc-dc convertor
  • Method for controlling the input voltage frequency of a dc-dc convertor
  • Method for controlling the input voltage frequency of a dc-dc convertor

Examples

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Embodiment Construction

[0046] Figure 1 to Figure 6 The same embodiment is referred to and will be annotated at the same time.

[0047] refer to figure 1, a charger 1 connected to a battery 13 of a three-phase grid 10 comprising a power factor correction stage 11 (also referred to as PFC stage 11) and DC current to DC current converters DC to DC 12a and 12b, each having an inverter device 212.

[0048] The three-phase grid 10 is mounted on an input filter 14 which delivers the filtered input current to the PFC stage 11 .

[0049] At the output of the PFC 11 the two DC voltage buses connected to the terminals of the output capacitors of the PFC stage 11 are respectively coupled to DC to DC converters 12a, 12b which are connected in parallel with the battery 13 at the output.

[0050] Each DC to DC 12a, 12b ( figure 2 Only one example is shown in ) including input MOSFET bridge 120, LLC circuit 121 (simplified circuit diagram of which is shown in image 3 shown), transformer 22 and output diode ...

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PUM

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Abstract

The invention concerns a method (30) for controlling the input voltage frequency of a DC-DC converter (12) comprising a step (65) of calculating a control frequency value (F) of said DC-DC converter (12), wherein: - if the measured voltage (VDCM) is greater than said upper voltage limit (VDCR+eps), the control frequency (F) corresponds to said minimum control frequency (FRMIN); - if the measured voltage (VDCM) is less than said lower voltage limit (VDCR-eps), the control frequency corresponds to said maximum control frequency (FRMAX); and - if the measured voltage (VDCM) is between said uppervoltage limit (VDCR+eps) and said lower voltage limit (VDCR-eps), the control frequency (F) corresponds to an average frequency (FMOY) calculated as a function of the difference between the setpoint voltage value (VDCR) and the measured voltage (VDCM), upper error values (eps) and lower error values (-eps) and maximum (FRMAX) and minimum (FRMIN) control frequency values.

Description

technical field [0001] The invention relates to the field of battery chargers, in particular for electric or hybrid vehicles. [0002] More precisely, the invention relates to a method for controlling the frequency of the input voltage of a DC current to DC current converter for a battery charger. Background technique [0003] Battery chargers (more commonly called chargers) for electric vehicles require large amounts of charging power, for example up to 22kW in three-phase operation, or up to 7kW in single-phase operation. [0004] These chargers typically consist of two power conversion stages: a first power factor correction stage (often abbreviated PFC) that performs the AC-to-DC conversion of the grid voltage to the DC bus, and controls the output current needed to charge the battery and power it through a transformer The second DC-to-DC conversion stage (referred to as DC-to-DC) of the isolated charger. [0005] reference to prior art figure 1 , the two output DC vo...

Claims

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Application Information

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IPC IPC(8): H02M3/337H02M1/00B60L53/22
CPCB60L53/22B60L2210/10Y02T10/72Y02T10/7072Y02T10/92Y02T10/70Y02T90/14H02M1/0058H02M3/33573H02M3/01H02J2207/20H02M1/0003H02J7/007H02M1/4208H02M3/33576H02M1/4241H02M1/0022
Inventor M·塔勒布A·马卢姆
Owner RENAULT SAS
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