EP2647118A2 - A power supply - Google Patents

A power supply

Info

Publication number
EP2647118A2
EP2647118A2 EP11799229.7A EP11799229A EP2647118A2 EP 2647118 A2 EP2647118 A2 EP 2647118A2 EP 11799229 A EP11799229 A EP 11799229A EP 2647118 A2 EP2647118 A2 EP 2647118A2
Authority
EP
European Patent Office
Prior art keywords
voltage
power supply
circuit
converter
voltages
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Withdrawn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
EP11799229.7A
Other languages
German (de)
French (fr)
Inventor
Hans Ole Hjulmand Kragh
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.)
Hydria Elektronik ApS
Original Assignee
Hydria Elektronik ApS
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 Hydria Elektronik ApS filed Critical Hydria Elektronik ApS
Publication of EP2647118A2 publication Critical patent/EP2647118A2/en
Withdrawn legal-status Critical Current

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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc 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
    • H02M7/217—Conversion of ac power input into dc 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
    • H02M7/2176—Conversion of ac power input into dc 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 comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • 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
    • H02M1/081—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters wherein the phase of the control voltage is adjustable with reference to the AC source
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection

Definitions

  • the invention relates to a power supply for electronic equipment, such as measurement equipment and signal transmitters for industrial control systems, said power supply being adapted to be connected to a wide range of voltages on the supply network and comprising an input stage with an overload protection, a circuit for rectifying the supply voltage, a phase cut circuit for determining the input voltage to a DC/DC converter as well as a DC/DC converter of the switch mode type.
  • the document US 5,587,895 A discloses an AC/DC converter which is capable of operating in a range from 24 Vac to 277 Vac.
  • the power supply is equipped with a half way rectifier 12, and the rectified voltage is connected to a MOSFET transistor 14, which supplies a charging current to a charging capacitor 18 on the dc side, where a load L is arranged.
  • the load and the control circuit of the MOSFET are supplied exclusively from the capacitor.
  • the document describes a power supply with a single unstabilized output, which is not galvanically separated from the supply network.
  • the document EP 0 651 499 A2 discloses an AC/DC converter comprising a half wave rectifier (D1 ), and where the rectified voltage is connected to a MOSFET (QM2), which supplies power to a stabilized series power supply (1 1 ) with a single output. The output is not galvanically separated from the supply network.
  • the circuit is adapted to compensate for sudden changes of the load.
  • the document US 6,169,391 B1 discloses an AC/DC converter, which comprises a rectifier, a control circuit and a linear voltage regulator. Via a voltage sensor, the control circuit controls a switch transistor, which is to keep the feed voltage over the charging capacitor so low as to enable the regulator to work.
  • the circuit is constructed to operate with a selected fixed mains voltage supply.
  • a power supply as described in the introductory portion of claim 1 , comprising an input stage with protection against overload and adapted for the connection of mains voltages in the range from 100 Vac to 690 Vac, a circuit for rectifying the supply voltage, a phase cut circuit which blocks voltages from the rectifier circuit exceeding 290 Vac, and which determines the input voltage to a DC/DC converter, as well as a DC/DC converter of the switch mode type.
  • Coupling of the input stage, the rectifier circuit and the phase cut circuit with a DC/DC converter provides an AC/DC converter which may be connected to mains voltages in the range from 100 Vac to 690 Vac, and which is capable of supplying a stabilized voltage to supply measurement equipment and signal transmitters. It is moreover ensured that the stabilized voltage is galvanically separated from the supply network. Further, it is ensured that a mains transformer may be omitted, and that it is possible to use diodes and charging capacitors having low inverse and/or testing voltages, thereby allowing the whole circuit to be built on circuit boards and allowing these to be arranged in industrial standard type modules.
  • the input stage When the input stage is arranged such that it comprises a resistor with a protection function, a varistor and a power-limiting resistor, it is ensured that the power supply may be protected against overvoltages or surge pulses arisen on the supply network.
  • the rectifier circuit comprises a set of diodes arranged in series with the input stage, a single rectification with half waves of the applied sine voltage is achieved.
  • the phase cut circuit comprises a switch transistor and a control circuit, said control circuit comprising a voltage circuit which keeps the switch transistor in a conductive state, as well as an optocoupler and a comparator to interrupt the conductive state of the transistor, it is ensured that current and power to the subsequent DC/DC converter may be regulated.
  • the one input of the comparator is connected to a reference voltage, and the other input is connected to the rectified half wave voltage via a voltage divider, it is ensured that the comparator activates the optocoupler when the divided half wave voltage exceeds the reference voltage, and cuts off the switch transistor.
  • the comparator When, as stated in claim 5, the comparator receives its voltage supply by passing the power consumption of the DC/DC converter through a zener diode and filtering the produced zener voltage in a capacitive filter, access to a supply which does not load the outputs of the converter is achieved. At the same time, the outputs of the converter are kept galvanically separate from the supply network.
  • the DC/DC converter is adapted to work with input voltages in the range from 100 Vdc to 300 Vdc, it is ensured that a commercially available converter may be used.
  • the outputs of the DC/DC converter are galvanically separated via a circuit which comprises a switch transformer and an optocoupler, a high insulation and security between the outputs and the supply network are achieved.
  • a circuit which comprises a switch transformer and an optocoupler, a high insulation and security between the outputs and the supply network are achieved.
  • the inverse voltage of the rectifier diodes does not exceed 1000 V, and that the testing voltage of the charging capacitor does not exceed 350 Vdc, it being ensured thereby that components with relatively small dimensions may be used, and that the area of the power supply may be reduced.
  • the switch transistor is a MOSFET switch transistor with a maximum voltage of 1000 Vdc.
  • fig. 1 shows a diagram of the power supply as well as some graphs showing current or voltages at selected points of the diagram.
  • FIG. 1 shows that the power supply 1 comprises an input stage 2, a rectifier circuit 3, a phase cut circuit 4 and a DC/DC converter 5.
  • the figure also shows the graphs A - D, which show current or voltages at selected points in the circuit.
  • the input stage 2 is connected to a supply network with a sine-shaped voltage from 100 Vac and up to 690 Vac.
  • R1 is a resistor with incorporated protection function, and R2 serves as a current limiter in the event that the varistor VR1 opens because of overvoltage or a surge pulse arisen in the supply network.
  • the diodes D1 , D2 are coupled to the input stage 2 and involve a single rectification of the applied sine voltage, so as to produce a half wave with a shape as shown in the graph A.
  • the phase cut circuit 4 is based on a switch transistor Q1 , which, most advantageously, might be a MOSFET transistor with a max voltage of 1000 Vdc.
  • a switch transistor Q1 which, most advantageously, might be a MOSFET transistor with a max voltage of 1000 Vdc.
  • the gate source of the transistor Via the resistor R5, the zener diode D3 and the resistor R6, the gate source of the transistor is biased with a voltage of 12 V, and is thereby conductive as long as the optocoupler U2 is interrupted, and the half wave of the rectified mains voltage has an amplitude which causes Q1 to be in a conductive state.
  • the optocoupler U2 is controlled by the comparator circuit, which is based on the analog amplifier U1.
  • the reference voltage of the comparator is obtained via the zener diode D4, which is connected to the voltage supply of the comparator via the resistor R7.
  • the zener voltage of D4 is typically 5.6 V.
  • the reference voltage is connected to the +input on the analog amplifier.
  • the input signal of the comparator is obtained from the voltage divider R3, R4, so that the single- rectified voltage is divided down to 5.6 V, when the peak value of the half wave is 290 V (see the graph A).
  • the output of the comparator is an open collector, which is connected to the cathode of the optocoupler U2 via the resistor R8 and the zener diode D5.
  • the anode is connected to a voltage of 12 V.
  • the comparator circuit requires a voltage supply. It is established via the power consumption of the converter, which is passed through the zener diode D8. D8 gives a voltage drop of 15 V, and the zener voltage is filtered through the capacitors C1 , C2 and the diode D9 to a voltage of 12 Vdc.
  • the phase cut function is as follows:
  • the output D of the comparator switches to a low level, the optocoupler U2 is activated, its transistor output becomes conductive and short-circuits the gate source of the switch transistor Q1 , whereby this is cut off. This means that charging of the charging capacitors C3, C4 is interrupted.
  • the charging starts again when the half wave has a value which is larger than the voltage of the charging capacitors C3, C4.
  • the diode D6 blocks discharging of the capacitors C3, C4 through the phase cut circuit in the pause.
  • the graph B shows the course of the charging current I in each half wave cycle.
  • the graph C shows the voltage of the charging capacitors C3, C4 of the DC/DC converter.
  • the graph D shows the output voltage of the comparator U1.
  • the phase cut circuit ensures that the voltage of the charging capacitors does not exceed 280 V, even though the supply voltage is up to 690 Vac.
  • the peak value of the rectified half wave is 975 V in this case, but the voltage to the DC/DC converter is kept effectively down by means of the switch transistor Q1.
  • the DC/DC converter comprises a circuit with a switch transformer T1 and an optocoupler U3. Both components ensure that there is a galvanic separation between the 12 V outputs of the converter and the supply network.
  • D7 is a transorber with a rated voltage of 330 V. It is introduced as a protection against destruction of the DC/DC converter. If the switch transistor Q1 fails and short-circuits, the transorber opens and causes the protection resistor R1 to cut off the mains voltage supply.
  • R3, R5 and R6 are selected such that they can withstand the high voltage. Typical values of R3 is 1 Mohm and for R5 and R6 0.5 Mohm.

Landscapes

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

Abstract

A power supply (1 ) for electronic equipment, such as measurement equipment and signal transmitters for industrial control systems, said power supply being adapted to be connected to a wide range of voltages of the supply network and comprising an input stage (2) with an overload protection, a circuit (3) for rectifying the supply voltage, a phase cut circuit (4) for determining the input voltage for a DC/DC converter as well as DC/DC converter (5) of the switch mode type. This results in a power supply with an AC/DC converter which may be connected to a mains voltage supply with voltages in the range from 100 Vac to 690 Vac, and which has a stabilized output voltage. Moreover, a circuit without a mains transformer is provided, in which the inverse voltage of the rectifier and the testing voltage of the charging capacitor are low, and where the circuit may be incorporated in an industrial module.

Description

A power supply
The invention relates to a power supply for electronic equipment, such as measurement equipment and signal transmitters for industrial control systems, said power supply being adapted to be connected to a wide range of voltages on the supply network and comprising an input stage with an overload protection, a circuit for rectifying the supply voltage, a phase cut circuit for determining the input voltage to a DC/DC converter as well as a DC/DC converter of the switch mode type.
In industrial control systems, voltages, both single-phase and three-phase, are available in the voltage range from 100 Vac to 690 Vac, depending on the area or country in which the control system is to be used. Accordingly, it is necessary to adapt the power supply to the voltages at disposal. Most frequently, this takes place by inserting a transformer into the power supply. However, it is not very practical or economical to have to manufacture and stock power supplies adapted to their respective mains voltages. In addition, it is a problem to have to incorporate a relatively large and heavy transformer in a power supply module of the type which is used in industrial control systems.
Through the years, voltage supplies have been developed which are capable of operating in the voltage range from 100 Vac to 250 Vac, but upgrading these power supplies to 690 Vac requires rectifier diodes with an inverse voltage of 2 kV and charging capacitors with testing voltages of at least 1000 Vdc.
The document US 5,587,895 A discloses an AC/DC converter which is capable of operating in a range from 24 Vac to 277 Vac. The power supply is equipped with a half way rectifier 12, and the rectified voltage is connected to a MOSFET transistor 14, which supplies a charging current to a charging capacitor 18 on the dc side, where a load L is arranged. In the negative half cycle, the load and the control circuit of the MOSFET are supplied exclusively from the capacitor. The document describes a power supply with a single unstabilized output, which is not galvanically separated from the supply network.
The document EP 0 651 499 A2 discloses an AC/DC converter comprising a half wave rectifier (D1 ), and where the rectified voltage is connected to a MOSFET (QM2), which supplies power to a stabilized series power supply (1 1 ) with a single output. The output is not galvanically separated from the supply network. The circuit is adapted to compensate for sudden changes of the load. The document US 6,169,391 B1 discloses an AC/DC converter, which comprises a rectifier, a control circuit and a linear voltage regulator. Via a voltage sensor, the control circuit controls a switch transistor, which is to keep the feed voltage over the charging capacitor so low as to enable the regulator to work. The circuit is constructed to operate with a selected fixed mains voltage supply.
The object of the invention
It is the object of the invention to provide a power supply having an AC/DC converter which may be connected to a mains voltage supply with voltages in the range from 100 Vac to 690 Vac, and which has a stabilized output voltage which is galvanically separated from the supply network.
It is another object to provide a circuit without a mains transformer, in which the inverse voltage of the rectifier and the testing voltage of the charging capacitor are relatively low, and where the circuit may be incorporated in an industrial module.
Summary of the invention The object stated above is achieved by a power supply as described in the introductory portion of claim 1 , comprising an input stage with protection against overload and adapted for the connection of mains voltages in the range from 100 Vac to 690 Vac, a circuit for rectifying the supply voltage, a phase cut circuit which blocks voltages from the rectifier circuit exceeding 290 Vac, and which determines the input voltage to a DC/DC converter, as well as a DC/DC converter of the switch mode type.
Coupling of the input stage, the rectifier circuit and the phase cut circuit with a DC/DC converter provides an AC/DC converter which may be connected to mains voltages in the range from 100 Vac to 690 Vac, and which is capable of supplying a stabilized voltage to supply measurement equipment and signal transmitters. It is moreover ensured that the stabilized voltage is galvanically separated from the supply network. Further, it is ensured that a mains transformer may be omitted, and that it is possible to use diodes and charging capacitors having low inverse and/or testing voltages, thereby allowing the whole circuit to be built on circuit boards and allowing these to be arranged in industrial standard type modules.
When the input stage is arranged such that it comprises a resistor with a protection function, a varistor and a power-limiting resistor, it is ensured that the power supply may be protected against overvoltages or surge pulses arisen on the supply network.
When, as stated in claim 2, the rectifier circuit comprises a set of diodes arranged in series with the input stage, a single rectification with half waves of the applied sine voltage is achieved.
When, as stated in claim 3, the phase cut circuit comprises a switch transistor and a control circuit, said control circuit comprising a voltage circuit which keeps the switch transistor in a conductive state, as well as an optocoupler and a comparator to interrupt the conductive state of the transistor, it is ensured that current and power to the subsequent DC/DC converter may be regulated.
When, as stated in claim 4, the one input of the comparator is connected to a reference voltage, and the other input is connected to the rectified half wave voltage via a voltage divider, it is ensured that the comparator activates the optocoupler when the divided half wave voltage exceeds the reference voltage, and cuts off the switch transistor.
When, as stated in claim 5, the comparator receives its voltage supply by passing the power consumption of the DC/DC converter through a zener diode and filtering the produced zener voltage in a capacitive filter, access to a supply which does not load the outputs of the converter is achieved. At the same time, the outputs of the converter are kept galvanically separate from the supply network.
When, as stated in claim 6, the DC/DC converter is adapted to work with input voltages in the range from 100 Vdc to 300 Vdc, it is ensured that a commercially available converter may be used.
When, as stated in claim 7, the outputs of the DC/DC converter are galvanically separated via a circuit which comprises a switch transformer and an optocoupler, a high insulation and security between the outputs and the supply network are achieved. It is moreover expedient, as stated in claim 8, that the inverse voltage of the rectifier diodes does not exceed 1000 V, and that the testing voltage of the charging capacitor does not exceed 350 Vdc, it being ensured thereby that components with relatively small dimensions may be used, and that the area of the power supply may be reduced.
It is moreover expedient, as stated in claim 9, that the switch transistor is a MOSFET switch transistor with a maximum voltage of 1000 Vdc.
The drawing
An exemplary embodiment of the invention will be explained more fully below with reference to the drawing, in which fig. 1 shows a diagram of the power supply as well as some graphs showing current or voltages at selected points of the diagram.
Detailed description of the invention
A power supply 1 for electronic equipment according to the invention is shown in fig. 1. Fig. 1 shows that the power supply 1 comprises an input stage 2, a rectifier circuit 3, a phase cut circuit 4 and a DC/DC converter 5. The figure also shows the graphs A - D, which show current or voltages at selected points in the circuit.
At the resistors R1 and R2, the input stage 2 is connected to a supply network with a sine-shaped voltage from 100 Vac and up to 690 Vac. R1 is a resistor with incorporated protection function, and R2 serves as a current limiter in the event that the varistor VR1 opens because of overvoltage or a surge pulse arisen in the supply network. In the rectifier circuit 3, the diodes D1 , D2 are coupled to the input stage 2 and involve a single rectification of the applied sine voltage, so as to produce a half wave with a shape as shown in the graph A.
The phase cut circuit 4 is based on a switch transistor Q1 , which, most advantageously, might be a MOSFET transistor with a max voltage of 1000 Vdc. Via the resistor R5, the zener diode D3 and the resistor R6, the gate source of the transistor is biased with a voltage of 12 V, and is thereby conductive as long as the optocoupler U2 is interrupted, and the half wave of the rectified mains voltage has an amplitude which causes Q1 to be in a conductive state. The optocoupler U2 is controlled by the comparator circuit, which is based on the analog amplifier U1.
The reference voltage of the comparator is obtained via the zener diode D4, which is connected to the voltage supply of the comparator via the resistor R7. The zener voltage of D4 is typically 5.6 V. The reference voltage is connected to the +input on the analog amplifier. The input signal of the comparator is obtained from the voltage divider R3, R4, so that the single- rectified voltage is divided down to 5.6 V, when the peak value of the half wave is 290 V (see the graph A). The output of the comparator is an open collector, which is connected to the cathode of the optocoupler U2 via the resistor R8 and the zener diode D5. The anode is connected to a voltage of 12 V.
The comparator circuit requires a voltage supply. It is established via the power consumption of the converter, which is passed through the zener diode D8. D8 gives a voltage drop of 15 V, and the zener voltage is filtered through the capacitors C1 , C2 and the diode D9 to a voltage of 12 Vdc. The phase cut function is as follows:
When the peak value of the single-rectified half wave exceeds 290 V, the output D of the comparator switches to a low level, the optocoupler U2 is activated, its transistor output becomes conductive and short-circuits the gate source of the switch transistor Q1 , whereby this is cut off. This means that charging of the charging capacitors C3, C4 is interrupted.
In the next half wave, the charging starts again when the half wave has a value which is larger than the voltage of the charging capacitors C3, C4. When the value of the half wave reaches 290 V, the charging ceases again. The diode D6 blocks discharging of the capacitors C3, C4 through the phase cut circuit in the pause. The graph B shows the course of the charging current I in each half wave cycle. The graph C shows the voltage of the charging capacitors C3, C4 of the DC/DC converter. The graph D shows the output voltage of the comparator U1. The phase cut circuit ensures that the voltage of the charging capacitors does not exceed 280 V, even though the supply voltage is up to 690 Vac. The peak value of the rectified half wave is 975 V in this case, but the voltage to the DC/DC converter is kept effectively down by means of the switch transistor Q1.
The DC/DC converter comprises a circuit with a switch transformer T1 and an optocoupler U3. Both components ensure that there is a galvanic separation between the 12 V outputs of the converter and the supply network.
D7 is a transorber with a rated voltage of 330 V. It is introduced as a protection against destruction of the DC/DC converter. If the switch transistor Q1 fails and short-circuits, the transorber opens and causes the protection resistor R1 to cut off the mains voltage supply.
In the practical structure, R3, R5 and R6 are selected such that they can withstand the high voltage. Typical values of R3 is 1 Mohm and for R5 and R6 0.5 Mohm.

Claims

PATENT CLAIMS
1. A power supply (1) for electronic equipment, such as measurement equipment and signal transmitters for industrial control systems, said power supply being adapted to be connected to a wide range of voltages of the supply network and comprising an input stage (2) with an overload protection, a circuit (3) for rectifying the supply voltage, a phase cut circuit (4) for determining the input voltage to a DC/DC converter as well as a DC/DC converter (5) of the switch mode type, characterized in that the input stage (2) is adapted to be connected to mains voltages in the range from 100 Vac to 690 Vac, and that the phase cut circuit (4) is adapted to block voltages from the rectifier circuit (3) which exceed 290 V.
2. A power supply according to claim 1 , characterized in that the rectifier circuit (3) is arranged in series with the input circuit (2) and comprises the diodes (D1 , D2), which are coupled as single rectifiers which produce half waves (A) of the applied sine-shaped mains voltage.
3. A power supply according to claims 1 - 2, characterized in that the phase cut circuit (4) comprises a switch transistor (Q1 ) and a control circuit, said control circuit comprising a biasing circuit (R5, D3, R6) which keeps the switch transistor in a conductive state, as well as an optocoupler (U2) and a comparator (U1 ) for interrupting the conductive state of the switch transistor.
4. A power supply according to claims 1 - 3, characterized in that the positive input of the comparator (U1 ) is connected to a voltage reference (R7, D4), and that the negative input is connected to the rectified half wave voltage (A) via a voltage divider (R3, R4), and that the output is coupled to the optocoupler (U2) via the resistor (R8) and the diode (D5).
5. A power supply according to claims 1 - 4, characterized in that the comparator gets its supply voltage by passing the power consumption of the DC/DC converter (5) through a zener diode (D8) and filtering the zener voltage in a filter (C1 , C2, D9).
6. A power supply according to claims 1 - 5, characterized in that the DC/DC converter (5) is adapted to operate with voltages in the range from l OO Vdc to 300 Vdc.
7. A power supply according to claims 1 - 6, characterized in that the outputs of the DC/DC converter are galvanically separated from the supply network via a circuit which comprises a switch transformer (T1) and an optocoupler (U3).
8. A power supply according to claims 1 - 7, characterized in that the inverse voltage of the diodes (D1 , D2) does not exceed 1000 V, and that the testing voltage of the charging capacitors (C3, C4) does not exceed 350 Vdc.
9. A power supply according to claims 1 - 8, characterized in that the switch transistor (Q1) is a MOSFET transistor with a max voltage of 1000 Vdc.
EP11799229.7A 2010-12-01 2011-11-29 A power supply Withdrawn EP2647118A2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DKPA201001089 2010-12-01
DKPA201001129A DK177225B1 (en) 2010-12-01 2010-12-16 AC / DC Power Supply with Phase Cut Circuit
PCT/DK2011/000142 WO2012072075A2 (en) 2010-12-01 2011-11-29 A power supply

Publications (1)

Publication Number Publication Date
EP2647118A2 true EP2647118A2 (en) 2013-10-09

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EP11799229.7A Withdrawn EP2647118A2 (en) 2010-12-01 2011-11-29 A power supply

Country Status (3)

Country Link
EP (1) EP2647118A2 (en)
DK (1) DK177225B1 (en)
WO (1) WO2012072075A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2775604A1 (en) * 2013-03-07 2014-09-10 Nxp B.V. A mains power converter, and methods of operating and equipment incorporating the same
EP2784931B1 (en) * 2013-03-25 2022-06-08 ebm-papst Mulfingen GmbH & Co. KG Method and control circuit for controlling a brushless electric motor
DE102021119739A1 (en) * 2021-07-29 2023-02-02 Truma Gerätetechnik GmbH & Co. KG Monitoring board and system with a monitoring board

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5517402A (en) * 1992-06-04 1996-05-14 Sanden Corporation Inverter circuit with an improved inverter driving circuit

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3126565B2 (en) 1993-11-01 2001-01-22 株式会社東芝 AC / DC converter
US5587895A (en) 1994-09-07 1996-12-24 Harkins; Michael T. Electrical power supply with single output from range of input voltages
US6169391B1 (en) 1999-07-12 2001-01-02 Supertex, Inc. Device for converting high voltage alternating current to low voltage direct current
US7355867B2 (en) * 2004-08-17 2008-04-08 Elster Electricity, Llc Power supply for an electric meter having a high-voltage regulator that limits the voltage applied to certain components below the normal operating input voltage
CN101399499A (en) * 2007-09-26 2009-04-01 力博特公司 Power source module with wide input voltage range
US8451627B2 (en) * 2007-11-16 2013-05-28 Itron, Inc. Devices and methods for converting alternating current (AC) power to direct current (DC) power

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5517402A (en) * 1992-06-04 1996-05-14 Sanden Corporation Inverter circuit with an improved inverter driving circuit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2012072075A2 *

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Publication number Publication date
WO2012072075A3 (en) 2012-11-08
WO2012072075A2 (en) 2012-06-07
DK177225B1 (en) 2012-07-23
DK201001129A (en) 2012-06-02

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