GB2533599A - Thyristor battery chargers with improved control system - Google Patents

Thyristor battery chargers with improved control system Download PDF

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Publication number
GB2533599A
GB2533599A GB1423018.9A GB201423018A GB2533599A GB 2533599 A GB2533599 A GB 2533599A GB 201423018 A GB201423018 A GB 201423018A GB 2533599 A GB2533599 A GB 2533599A
Authority
GB
United Kingdom
Prior art keywords
output
thyristor
rectifier
voltage
control system
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.)
Withdrawn
Application number
GB1423018.9A
Inventor
Malcilm Pike John
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Norco Group Ltd
Original Assignee
Norco Group Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Norco Group Ltd filed Critical Norco Group Ltd
Priority to GB1423018.9A priority Critical patent/GB2533599A/en
Priority to GB1522684.8A priority patent/GB2535306B/en
Publication of GB2533599A publication Critical patent/GB2533599A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
    • H02J2007/10—
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter

Abstract

A battery charging device has a supply voltage 1 reduced by a transformer 2. The reduced voltage is rectified using a thyristor controlled rectifier 3. The rectified voltage is then smoothed using an inductor 4 and a capacitor 5. The charger output, output voltage and output current are indicated at 6,7, and 8 respectively. A feedback control 9 generates a demand control signal 10 which is fed into linearizer 11. The linearizer generates a corrected demand control signal 12 which is supplied to the thyristor controlled rectifier 3. The corrected signal acts to control the thyristor and therefore produces an output voltage from the rectifier that is linear with respect to the firing angle [Figures 2 and 4]. The linear relationship between the firing angle and the rectifier output acts to produce a constant gain in the control system for all firing angles allowing the battery charger to operate over a wider range of input and output voltages including single and multiple phase input voltages.

Description

Background
This invention relates to Thyristor Battery Chargers that are used to converter an AC mains supply to a DC source that is used to charg batteries. This is done using a controlled thyristor bridge to convert the AC to DC. A control system alters the firing angle of the thyristors. The problem that occurs is that the output voltage of the thyristor bridge varies non-linearly with respect to the firing angle. This means that the control loop cannot be optimised for all firing angles.
Statement of Invention
To overcome this, an additional function is carried out between the thyristor rectifier and the control system that ensure that the relationship between firing angle and voltage out from the rectifier is linear.
Advantages The linearization of the firing angle ensures a constant gain in the control system for all firing angles. This means that a higher gain can be used in the control system. The chargers will operate over a wider range of input and output voltage, have a larger bandwidth and a faster response to step loads.
intsoduct on to draw gs An example of the invention will now be described by referring to the accompanying drawings * Figure 1 shows the overall system drawing * Figure 2 shows the firing angle * Figure 3 shows the relationship between firing angle and voltage output * Figure 4 shows the correcting function.
Descrkton The amplitude of the incoming mains supply 1 is reduced by a transformer 2. The voltage is then rectified by a thyristor controlled rectifier 3. The rectifier voltage is then smoothed by a filter created using an inductor 4 and a capacitor 5 to produce the charger output at 6. The output voltage 7 and output current 8 are measured and fed into the control system 9. The control system 9 produces a demand control signal 10 which is then passed to the linearizer 11. The linearizer 11 produces a corrected demand control signal 12 for the thyristor controlled rectifier 3.
Figure 2 shows the firing angle. The firing angle 14 is shown as the time between the rectifier input voltage 13, the output of transformer 2, crossing through zero and the point when the thyristor is turned on in the thyristor controlled rectifier 3. The output of the thyristor control rectifier 3 is shown as waveform 15. The relationship between the firing angle and the DC out of the thyristor controlled rectifier 3 is given by: Vdc = Vmax (1 + Cosx)/* Vdc = dc output of the rectifier 16 Vmax = is the peak input voltage to the thyristor rectifier 13 X = the firing angle 14 Figure 3 shows the nonlinearity of the dc output of the rectifier 16 with respect to the firing angle 14. It follows that in order to make this into a linear function the linearizer must perform the inverse of the X = acos((Dem** /Vmax) -X = the firing angle 14 Dem = demand control signal 10 Vmax = is the peak input voltage to the thyristor rectifier 13 Figure 4 shows the relationship between the firing angle and demand control signal when it passes through the linearizer.
The linearization of the control system can be used in all forms of two and three phase thyristor chargers.

Claims (3)

  1. g:§§ins 1. A Thyristor controlled battery charger with a control that has a correction in the control system for the non-linearity of the thyristor control rectifier.
  2. 2. A Thyristor controlled battery charger according to claim 1 which is either powered by single or three phases.
  3. 3. A Thyristor controlled battery charger according to claim 2 which has one or more thyristors.
GB1423018.9A 2014-12-23 2014-12-23 Thyristor battery chargers with improved control system Withdrawn GB2533599A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1423018.9A GB2533599A (en) 2014-12-23 2014-12-23 Thyristor battery chargers with improved control system
GB1522684.8A GB2535306B (en) 2014-12-23 2015-12-22 Thyristor battery chargers with improved control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1423018.9A GB2533599A (en) 2014-12-23 2014-12-23 Thyristor battery chargers with improved control system

Publications (1)

Publication Number Publication Date
GB2533599A true GB2533599A (en) 2016-06-29

Family

ID=55311465

Family Applications (2)

Application Number Title Priority Date Filing Date
GB1423018.9A Withdrawn GB2533599A (en) 2014-12-23 2014-12-23 Thyristor battery chargers with improved control system
GB1522684.8A Active GB2535306B (en) 2014-12-23 2015-12-22 Thyristor battery chargers with improved control system

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB1522684.8A Active GB2535306B (en) 2014-12-23 2015-12-22 Thyristor battery chargers with improved control system

Country Status (1)

Country Link
GB (2) GB2533599A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11069926B1 (en) * 2019-02-14 2021-07-20 Vcritonc Alpha, Inc. Controlling ongoing battery system usage via parametric linear approximation

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1301852A (en) * 1969-04-10 1973-01-04

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1360089A (en) * 1971-11-16 1974-07-17 J A Macharg Battery chargers

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1301852A (en) * 1969-04-10 1973-01-04

Also Published As

Publication number Publication date
GB201522684D0 (en) 2016-02-03
GB2535306A (en) 2016-08-17
GB2535306B (en) 2019-09-25

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)