CN105490519A - Control method for DC-DC converter - Google Patents

Control method for DC-DC converter Download PDF

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Publication number
CN105490519A
CN105490519A CN201510937913.0A CN201510937913A CN105490519A CN 105490519 A CN105490519 A CN 105490519A CN 201510937913 A CN201510937913 A CN 201510937913A CN 105490519 A CN105490519 A CN 105490519A
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CN
China
Prior art keywords
battery
voltage
electricity condition
static charge
converter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510937913.0A
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Chinese (zh)
Inventor
王菊霞
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Suzhou Beiduo Environmental Protection Technology Co Ltd
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Suzhou Beiduo Environmental Protection Technology Co Ltd
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Filing date
Publication date
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Priority to CN201510937913.0A priority Critical patent/CN105490519A/en
Publication of CN105490519A publication Critical patent/CN105490519A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00Conversion of dc power input into dc power output

Abstract

The invention relates to a control method for a DC-DC converter. The method mainly comprises the following steps: building a static charged state model aiming at a low-voltage battery; setting a static charged threshold according to the static charged state model; monitoring the static charged state of the low-voltage battery through a monitor in real time; and setting an output voltage of the DC-DC converter. According to the control method for the DC-DC converter, the operating efficiency of the converter can be improved; the electric energy supplied to the low-voltage battery from a high-voltage power battery is in relatively optimal state; and the energy utilization rate of the high-voltage power battery is improved.

Description

A kind of DC-to-DC converter control method
Technical field
The present invention relates to electric automobile field, be specifically related to a kind of DC-to-DC converter control method.
Background technology
Along with the continuous deterioration of global environment and the in short supply of the energy, reducing air pollution and relying on petroleum-based energy becomes the problem more and more paid close attention to various countries.In order to reduce environmental pollution, alleviate Pressure on Energy, the automobile of research energy-saving and environmental protection becomes a kind of inevitable trend of various countries' development auto industry.At present, research and production electric automobile have become the first-selection of various countries' automobile industry.
Normally, electric automobile comprises two power storage bags: high voltage power battery and A-battery.High voltage power battery normally when mixed motor-car regenerative braking, the electrical power storage that vehicle energy is changed into; A-battery is then used for powering to vehicle-mounted low-voltage load, and the performance cutting stream device of impact to voltage battery and A-battery conversion efficiency becomes the vital influencing factor to electric automobile combination property.
In the middle of prior art, the control method of DC-to-DC converter is comparatively simple, fixes the low-voltage output voltage of direct current converter, and fixing output voltage very flexible, often can not consider the combination property of system, therefore, the operational efficiency of electric automobile has been had a strong impact on.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of DC-to-DC converter control method, described method mainly comprises: set up static charge electricity condition model for A-battery, arrange static charged threshold value according to static charge electricity condition model, monitored the static charge electricity condition of A-battery by watch-dog in real time, set the output voltage of described DC-to-DC converter, this method can improve the operational efficiency of transducer, make high voltage power battery be in more excellent state to the electric energy that A-battery provides, improve the capacity usage ratio of high voltage power battery.
The present invention realizes with following technical scheme, a kind of DC-to-DC converter control method, described electric automobile comprises high voltage power battery network, A-battery, watch-dog and DC-to-DC converter, described DC-to-DC converter is used for powering from the high voltage power battery network of electric automobile to the A-battery of electric automobile, and described control method comprises the following steps:
S1. set up static charge electricity condition model for A-battery, described static charge electricity condition model is S ocd=S ocbkf (i), wherein S ocdfor static charge electricity condition, S ocbfor nominal state-of-charge, k is temperature coefficient, and i is actual current, and f (i) determines according to the test for A-battery;
S2. static charged threshold value is set according to static charge electricity condition model;
S3. the static charge electricity condition of A-battery is monitored in real time by watch-dog;
S4. the voltage set point of described DC-to-DC converter is set according to described static charge electricity condition, and the output voltage of described DC-to-DC converter is set according to described voltage set point, described voltage set point reduces with the rising of described static charge electricity condition.
Preferably, described voltage set point meets the form of the hyp branch being positioned at first quartile with the Changing Pattern of described static charge electricity condition.
Preferably, described voltage set point changes with described static charge electricity condition parabolic.
Preferably, described voltage set point changes with form of straight lines with described static charge electricity condition.
Preferably, by controlling described voltage set point, described static charge electricity condition is maintained between 40% ~ 55%.
Preferably, described A-battery is the battery of 12 volts, 24 volts or 36 volts.
The invention has the beneficial effects as follows:
The invention provides a kind of DC-to-DC converter control method, described method mainly comprises: set up static charge electricity condition model for A-battery, arrange static charged threshold value according to static charge electricity condition model, monitored the static charge electricity condition of A-battery by watch-dog in real time, set the output voltage of described DC-to-DC converter, this method can improve the operational efficiency of transducer, make high voltage power battery be in more excellent state to the electric energy that A-battery provides, improve the capacity usage ratio of high voltage power battery.
Accompanying drawing explanation
Fig. 1 is flow chart of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
In one embodiment, as shown in Figure 1, a kind of DC-to-DC converter control method, described electric automobile comprises high voltage power battery network, A-battery, watch-dog and DC-to-DC converter, described DC-to-DC converter is used for powering from the high voltage power battery network of electric automobile to the A-battery of electric automobile, and described control method comprises the following steps:
S1. set up static charge electricity condition model for A-battery, described static charge electricity condition model is S ocd=S ocbkf (i), wherein S ocdfor static charge electricity condition, S ocbfor nominal state-of-charge, k is temperature coefficient, and i is actual current, and f (i) determines according to the test for A-battery;
S2. static charged threshold value is set according to static charge electricity condition model;
S3. the static charge electricity condition of A-battery is monitored in real time by watch-dog;
S4. the voltage set point of described DC-to-DC converter is set according to described static charge electricity condition, and the output voltage of described DC-to-DC converter is set according to described voltage set point, described voltage set point reduces with the rising of described static charge electricity condition.
Described voltage set point meets the form of the hyp branch being positioned at first quartile with the Changing Pattern of described static charge electricity condition.
By controlling described voltage set point, described static charge electricity condition is maintained between 40% ~ 55%.Described A-battery is the battery of 12 volts.
Second embodiment, a kind of DC-to-DC converter control method, described electric automobile comprises high voltage power battery network, A-battery, watch-dog and DC-to-DC converter, described DC-to-DC converter is used for powering from the high voltage power battery network of electric automobile to the A-battery of electric automobile, and described control method comprises the following steps:
S1. set up static charge electricity condition model for A-battery, described static charge electricity condition model is S ocd=S ocbkf (i), wherein S ocdfor static charge electricity condition, S ocbfor nominal state-of-charge, k is temperature coefficient, and i is actual current, and f (i) determines according to the test for A-battery;
S2. static charged threshold value is set according to static charge electricity condition model;
S3. the static charge electricity condition of A-battery is monitored in real time by watch-dog;
S4. the voltage set point of described DC-to-DC converter is set according to described static charge electricity condition, and the output voltage of described DC-to-DC converter is set according to described voltage set point, described voltage set point reduces with the rising of described static charge electricity condition.
Described voltage set point changes with described static charge electricity condition parabolic.By controlling described voltage set point, described static charge electricity condition is maintained between 40% ~ 55%.Described A-battery is the battery of 4 volts.
Third embodiment of the invention, a kind of DC-to-DC converter control method, described electric automobile comprises high voltage power battery network, A-battery, watch-dog and DC-to-DC converter, described DC-to-DC converter is used for powering from the high voltage power battery network of electric automobile to the A-battery of electric automobile, and described control method comprises the following steps:
S1. set up static charge electricity condition model for A-battery, described static charge electricity condition model is S ocd=S ocbkf (i), wherein S ocdfor static charge electricity condition, S ocbfor nominal state-of-charge, k is temperature coefficient, and i is actual current, and f (i) determines according to the test for A-battery;
S2. static charged threshold value is set according to static charge electricity condition model;
S3. the static charge electricity condition of A-battery is monitored in real time by watch-dog;
S4. the voltage set point of described DC-to-DC converter is set according to described static charge electricity condition, and the output voltage of described DC-to-DC converter is set according to described voltage set point, described voltage set point reduces with the rising of described static charge electricity condition.
Described voltage set point changes with form of straight lines with described static charge electricity condition.By controlling described voltage set point, described static charge electricity condition is maintained between 40% ~ 55%.Described A-battery is the battery of 36 volts.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.

Claims (6)

1. a DC-to-DC converter control method, it is characterized in that, described electric automobile comprises high voltage power battery network, A-battery, watch-dog and DC-to-DC converter, described DC-to-DC converter is used for powering from the high voltage power battery network of electric automobile to the A-battery of electric automobile, and described control method comprises the following steps:
S1. set up static charge electricity condition model for A-battery, described static charge electricity condition model is S ocd=S ocbkf (i), wherein S ocdfor static charge electricity condition, S ocbfor nominal state-of-charge, k is temperature coefficient, and i is actual current, and f (i) determines according to the test for A-battery;
S2. static charged threshold value is set according to static charge electricity condition model;
S3. the static charge electricity condition of A-battery is monitored in real time by watch-dog;
S4. the voltage set point of described DC-to-DC converter is set according to described static charge electricity condition, and the output voltage of described DC-to-DC converter is set according to described voltage set point, described voltage set point reduces with the rising of described static charge electricity condition.
2. a kind of DC-to-DC converter control method according to claim 1, is characterized in that, described voltage set point meets the form of the hyp branch being positioned at first quartile with the Changing Pattern of described static charge electricity condition.
3. a kind of DC-to-DC converter control method according to claim 1, is characterized in that, described voltage set point changes with described static charge electricity condition parabolic.
4. a kind of DC-to-DC converter control method according to claim 1, is characterized in that, described voltage set point changes with form of straight lines with described static charge electricity condition.
5. according to a kind of DC-to-DC converter control method in claim 1-4 described in any one, it is characterized in that, by controlling described voltage set point, described static charge electricity condition being maintained between 40% ~ 55%.
6. a kind of DC-to-DC converter control method according to claim 5, is characterized in that, described A-battery is the battery of 12 volts, 24 volts or 36 volts.
CN201510937913.0A 2015-12-15 2015-12-15 Control method for DC-DC converter Pending CN105490519A (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110696752A (en) * 2019-11-21 2020-01-17 北京理工大学 Energy efficiency improving method for low-voltage electrical system of pure electric vehicle

Citations (3)

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Publication number Priority date Publication date Assignee Title
CN102545585A (en) * 2010-12-23 2012-07-04 上海汽车集团股份有限公司 Method for controlling voltage set point of direct-current high-voltage/low-voltage converter
CN102570792A (en) * 2010-12-23 2012-07-11 上海汽车集团股份有限公司 Control method of voltage setting point of direct current high voltage and low voltage converter
US20140336855A1 (en) * 2013-05-07 2014-11-13 Hyundai Motor Company Method of controlling operation mode of fuel cell in fuel cell vehicle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102545585A (en) * 2010-12-23 2012-07-04 上海汽车集团股份有限公司 Method for controlling voltage set point of direct-current high-voltage/low-voltage converter
CN102570792A (en) * 2010-12-23 2012-07-11 上海汽车集团股份有限公司 Control method of voltage setting point of direct current high voltage and low voltage converter
US20140336855A1 (en) * 2013-05-07 2014-11-13 Hyundai Motor Company Method of controlling operation mode of fuel cell in fuel cell vehicle

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Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110696752A (en) * 2019-11-21 2020-01-17 北京理工大学 Energy efficiency improving method for low-voltage electrical system of pure electric vehicle
CN110696752B (en) * 2019-11-21 2021-04-13 北京理工大学 Energy efficiency improving method for low-voltage electrical system of pure electric vehicle

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Application publication date: 20160413