GB2460066A - A pulse width modulated voltage source in which the pulse width modulation scheme is modified to ensure power supply to a capacitor powered switch - Google Patents

A pulse width modulated voltage source in which the pulse width modulation scheme is modified to ensure power supply to a capacitor powered switch Download PDF

Info

Publication number
GB2460066A
GB2460066A GB0808808A GB0808808A GB2460066A GB 2460066 A GB2460066 A GB 2460066A GB 0808808 A GB0808808 A GB 0808808A GB 0808808 A GB0808808 A GB 0808808A GB 2460066 A GB2460066 A GB 2460066A
Authority
GB
United Kingdom
Prior art keywords
capacitor
modified
duty cycle
pulse width
pwm
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.)
Granted
Application number
GB0808808A
Other versions
GB0808808D0 (en
GB2460066B (en
Inventor
Richard Kenny
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to GB0808808A priority Critical patent/GB2460066B/en
Publication of GB0808808D0 publication Critical patent/GB0808808D0/en
Publication of GB2460066A publication Critical patent/GB2460066A/en
Application granted granted Critical
Publication of GB2460066B publication Critical patent/GB2460066B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5383—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a self-oscillating arrangement
    • H02M7/53846—Control circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5383—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a self-oscillating arrangement
    • H02M7/53846—Control circuits
    • H02M7/538466—Control circuits for transistor type converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/793—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using discharge tubes only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
    • H03K17/0812—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the control circuit
    • H03K17/08126—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the control circuit in bipolar transitor switches
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
    • H03K17/6871—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors the output circuit comprising more than one controlled field-effect transistor
    • H03K17/6872—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors the output circuit comprising more than one controlled field-effect transistor using complementary field-effect transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
    • H03K17/6877—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors the control circuit comprising active elements different from those used in the output circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

In a pulse width modulated voltage supply, also known as a half bridge power supply, a capacitor is provided as an energy store in one of the two switches. In order to ensure that this capacitor remains charged when the duty cycle of this switch is determined to be above a threshold (i.e. when the voltage of the power output exceeds a certain level), a modified pulse width modulation (PWM) scheme is applied. This scheme ensures that the capacitor is recharged every so many (N) PWM cycles and can be implemented by using a suitably programmed microprocessor, for example an application specific integrated circuit (ASIC), to control the gate drivers. The microprocessor may control the gate drivers according to a determination of whether an input demand signal will result in the voltage of the power output exceeding a threshold. Ensuring that the capacitor is recharged is achieved by controlling the gate drivers so that the lower switch (i.e. the switch without a capacitor) is switched on for a short time in every Nth PWM period.

Description

A pulse width modulated voRacie source and method This invention relates to a pulse width modulated (PWM) voRage source particularly but not exdusively for use in half bndge power supply applications and a method for control of such a source.
An example of a half bndge power supply is shown in prior art figure 1. It includes a logic power supply 1 connected to a ow side gate driver 2 which provides a control output to a transistor 3. A diode 4 is connected across the coector and emitter of the transistor 3, the emitter is connected to a negative power reference terminal 5 and the coector is connected to a half bridge output 6. A high voRage diode 7 is connected from the logic power supply to a high side gate driver 8. The gate driver 8 provides a control signal to the base of a transistor 9 the coflector of which is connected to a positive power rail 10 with the emitter connected to the half bridge output terminal 6. A diode 12 is connected across the collector and emitter of the transistor 3. A storage capacitor 11 is connected across the gate driver and to the emitter of the transistor 9. A second capacitor is connected across the gate driver 2. A controller 13 provides control signals to the gate drivers to selectively switch them and to give a resultant Pulse Width Modulated output. By varying the duty cycle of the low and the high side devices various output voltages may be provided at the half bridge output 6. The controller 13 is a suitably programmed microprocessor.
Figure 1 implements bootstrapping to provide the power supply for the gate driver 8.
This technique involves the use of the diode 7 and the storage capacitor 11 to provide a local power supply to the gate driver 8. When the low side power device 2,3,4 is active current flows from the logic power supply 1 through the high voltage diode 7 to charge the storage capacitor 11 at the high side gate drive 8. When the high side power device 8, 9, 12 is active, the high voltage diode 7 blocks current flowing back out of the capacitor 11 which then continues to provide power to the gate driver 8.
It will be appreciated that in PWM modulation when one transistor is switched on the other is switched off. Thus when reference is made to for example transistor 3 switching on t will be understood that the transistor 9 will be switched off.
In figure 2, it will be seen that we have an output waveform to be provided to an AC motor. It is also called fundamental output waveform which results from the average PWM output voltage which is generated by selectively switching switches 9 and 3.
Region A corresponds to switch 3 being on for the entire PWM period. Region B corresponds to switch 9 being on the entire PWM period. At points between these regions the voltages will be generated by the appropriate use of both the switches in accordance with PWM control methods.
A problem occurs with the bootstrap capacitor in such arrangements, in that, charge can only flow into the storage capacitor while the ow power side transistor 3 is conducting.
Thus, for some desired voltage levels, this may not occur for many switching cycles and the capacitor does not re-charge.
During region B, the switch 9 is always on and thus the reference voltage for gate driver 8 is always at the same potential as 10. Capacitor 11 cannot be charged through diode 7 during this time and so it must be large enough to provide power to the gate driver 8 during this period. In applications requiring low frequency or DC output voltages which can go up to the voltage rail 10 there wiI be limited possibi'ity of recharging the capacitor and hence a very large capacitor or additional power supply will be required.
An alternative approach that has been used is to limit the available voltage. This is shown in figure 3 where line 30 shows the largest possible voltage corresponding to the power line 10 in figure 1. In this case, in region B, switch 9 is on for 95% (or other suitable value) of each PWM period in order that the switch 3 operates for a minimum portion of the PWM period. This technique allows diode 7 to recharge the capacitor 11 during every PWM period but imits the maximum possible output voltage due to the reduced maximum average PWM ratio.
The problem addressed by the invention is how to maximise the output voltage whilst minimising capacitor value.
According to the invention there is provided a pulse width modulated voftage source comprising high side and low side power switches driven by respective drivers under the control of a controller, a capacitor connected to provide energy to an associated one of the drivers wherein the controller determines the duty cycle of the switches to provide an appropriate output voltage waveform and characterised in that in the event of the duty cyde of the associated switch exceeds a certain threshold then a modified duty cycle is applied to periodically switch on the other switch for time separated by at least one switching cycle such that the capacitor is, at least in part, re-charged.
Thus, by controlling the switching in the aforementioned manner the capacitor is periodically recharged even if for most of the switching cycle the low side power device is switched off. Thus, the requirement for a large storage capacitor is reduced or eliminated.
A specific embodiment of the invention will now be described, by way of example only, with reference to the figures in which:
Figure 1 shows a prior art figure;
Figure 2 and 3 are explanatory diagrams; Figure 4 shows an embodiment of the invention; and Figure 5 shows an alternative embodiment.
As is shown in figure 3, a power supply includes a logic power supply 1 connected to a low side gate driver 2 which provides a control output to a transistor 3. A diode 4 is connected across the collector and emitter of the transistor 3, the emitter is connected to a negative power reference terminal 5 and the collector is connected to a half bridge output 6. A high voltage diode 7 is connected from the logic power supply to a high side gate driver 8. The gate driver 8 provides a control signal to the base of a transistor 9 the collector of which is connected to a positive power rail 10 with the emitter connected to the half bridge output terminal 6. A diode 12 is connected across the coUector and emitter of the transistor 3. A storage capacitor ills connected across the gate driver and to the emitter of the transistor 9. A second capacitor is connected across the gate driver 2. A controller 1 3 provides control signa's to the gate drivers to selectively switch them and to give a resultant Pulse Width Modulated output. By varying the duty cycle of the low and the high side devices various output voltages may be provided at the half bridge output 6.
The controller 13 is a microprocessor and associated memory programmed to provide a number of blocks of functionality (In some embodiments an Application Specific Integrated Circuit (ASIC) may be preferred for their inherent speed of processing). A first block 131 accepts an input signal setting the required power output voltage level. This it compares with a threshold held in memory 132. If the input demand signal would result in a voltage which would exceed this threshold then a modified scheme is adopted in which the lower switch 3 is switched on for a short time every nth PWM period in order to charge the capacitor 11. For a small drive switching at 16kHz, a capacitor refresh rate of 1 milU-second would require n value of 16 In an alternative embodiment shown in figure 5, the controller 13 is responsive to a demand signal in the normal manner to provide control signals to the gate drivers.
However, in this embodiment, a block of post-processing 14 is provided which determines when the output of the controUer 13 wiI exceed a threshold of output voltage level and then modifies the PWM signals as described above to ensure that the lower switch 3 is switched on for on for a short time every nth PWM period in order to charge the capacitor 11.
It will be appreciated that the transistors shown may be exchanged for other types of transistors and switches or relays.

Claims (8)

  1. Claims 1. A pulse width modulated voltage source comprising a high side and a low side power switches driven by respective drivers under the control of a controller, a capacitor S connected to provide energy to an associated one of the switches wherein the controller determines the duty cycle of the switches to provide an appropriate output voltage waveform and characterised in that in the event of the duty cycle of the associated switch exceeds a certain threshold then the other power switch is periodically switched on in a modified duty cycle for time separated by at least one switching period in order to that the capacitor is, at least in part, re-charged.
  2. 2. A source as claimed in claim 1 wherein the controller provides a PWM modulated control signal which signal being modified by a modifier to provide the modified duty cycle upon determination that an input demand signal will result in the exceeding of a predetermined voltage output level prior to application of the signal to the drivers.
  3. 3. A source as claimed in claim 1 wherein the controller comprises a PWM modulator and a demand controller responsive to an input demand signal to provide the control signal to the PWM modulator which demand controller being responsive to a threshold value to modify the demand to provide the modified duty cycle.
  4. 4. A source as claimed as claimed in any preceding claim wherein the PWM signal is modified every Nth cycle.
  5. 5. A pulse width modulated voltage source substantially as hereinbef ore described with reference to the drawing.
  6. 6. A method of driving a pulse width modulated voltage source having a high side and a low side power switches driven by respective drivers under the control of a controller, a capacitor connected to provide energy to an associated one of the switches which method comprising determining the duty cycle of the switches to provide an appropriate output voltage waveform and driving the switches in accordance with the duty cycle characterised in that in the event of the duty cycle of the associated switch exceeds a certain threshold then the other power switch is periodically switched on in a modified duty cycle for time separated by at least one switching period n order to that the capacitor s, at least in part, re-charged.
  7. 7. A method as claimed in claim 6 comprising the further steps of: providing a PWM modulated control signal to the drivers which signa' being modified to provide the modified duty cycle upon determination that an input demand signal would result in the exceeding of a predetermined voltage output leveL
  8. 8. A method as claimed in claim 7 wherein the PWM signal is modified every Nth cycle.
GB0808808A 2008-05-15 2008-05-15 A pulse width modulated voltage source and method Expired - Fee Related GB2460066B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0808808A GB2460066B (en) 2008-05-15 2008-05-15 A pulse width modulated voltage source and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0808808A GB2460066B (en) 2008-05-15 2008-05-15 A pulse width modulated voltage source and method

Publications (3)

Publication Number Publication Date
GB0808808D0 GB0808808D0 (en) 2008-06-18
GB2460066A true GB2460066A (en) 2009-11-18
GB2460066B GB2460066B (en) 2010-08-11

Family

ID=39571385

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0808808A Expired - Fee Related GB2460066B (en) 2008-05-15 2008-05-15 A pulse width modulated voltage source and method

Country Status (1)

Country Link
GB (1) GB2460066B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2761751A1 (en) * 2011-09-28 2014-08-06 Tridonic Uk Ltd Monitoring of pulse width modulation control

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0352565A (en) * 1989-07-18 1991-03-06 Brother Ind Ltd Pulse width modulation type supply voltage
WO1997024794A2 (en) * 1995-12-27 1997-07-10 Philips Electronics N.V. Integrated driver for half-bridge circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0352565A (en) * 1989-07-18 1991-03-06 Brother Ind Ltd Pulse width modulation type supply voltage
US5666280A (en) * 1993-05-07 1997-09-09 Philips Electronics North America Corporation High voltage integrated circuit driver for half-bridge circuit employing a jet to emulate a bootstrap diode
WO1997024794A2 (en) * 1995-12-27 1997-07-10 Philips Electronics N.V. Integrated driver for half-bridge circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2761751A1 (en) * 2011-09-28 2014-08-06 Tridonic Uk Ltd Monitoring of pulse width modulation control
EP2761751B1 (en) * 2011-09-28 2021-06-09 Tridonic Uk Ltd Monitoring of pulse width modulation control

Also Published As

Publication number Publication date
GB0808808D0 (en) 2008-06-18
GB2460066B (en) 2010-08-11

Similar Documents

Publication Publication Date Title
US7388422B2 (en) Charge pump circuit for high side drive circuit and driver driving voltage circuit
JP5141049B2 (en) Gate voltage control circuit and gate voltage control method
US10644583B2 (en) Methods, apparatus, and system to provide a high-efficiency drive for a floating power device
CN110546886B (en) Method and device for driving semiconductor element, and power conversion device
CN102957306B (en) Gate driver circuit and power conversion unit
US8030986B2 (en) Power transistor with turn off control and method for operating
KR100687936B1 (en) Electronic apparatus and power circuit
US8536819B2 (en) Power supply device
US10116292B2 (en) IGBT gate driving circuit
US9391548B2 (en) Motor driving device for vehicle
JP4925719B2 (en) Gate drive circuit
US10637356B2 (en) Multiple-level buck boost converter control
CN108306487B (en) Variable voltage converter control in a vehicle
JP6439522B2 (en) Switching element drive circuit
JP5605263B2 (en) Load drive device
US20010020841A1 (en) Drive circuit for insulated gate type fets
GB2460066A (en) A pulse width modulated voltage source in which the pulse width modulation scheme is modified to ensure power supply to a capacitor powered switch
JP6343247B2 (en) Motor drive control device and motor drive control method
US8638129B2 (en) Power circuit
EP3637609B1 (en) Inverter device and electrically driven device using same
US8476939B1 (en) Switching power supply gate driver
CN108233705B (en) Device for controlling a converter
EP3493394A1 (en) Motor controller
US20200395837A1 (en) Apparatus and method for controlling driving of switching device for power converter
JP6908338B2 (en) Piezoelectric element drive

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20180515