EP1925010A1 - Control circuit for a relay - Google Patents
Control circuit for a relayInfo
- Publication number
- EP1925010A1 EP1925010A1 EP06764171A EP06764171A EP1925010A1 EP 1925010 A1 EP1925010 A1 EP 1925010A1 EP 06764171 A EP06764171 A EP 06764171A EP 06764171 A EP06764171 A EP 06764171A EP 1925010 A1 EP1925010 A1 EP 1925010A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- voltage source
- relay
- diode
- capacitor
- voltage
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
- H01H47/04—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current
- H01H47/043—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current making use of an energy accumulator
Definitions
- the invention relates to a drive circuit for a relay, wherein a coil of the relay and a switching element connected in series are supplied by a first voltage source formed by a capacitor and wherein the capacitor is connected via a charging circuit formed from a first diode to an AC voltage source.
- Control circuits for relays whose coil is connected in series with only one switching element to a voltage source known from the prior art.
- a relay is activated and deactivated by switching the switching element, for example a transistor, on and off.
- a freewheeling circuit is provided with a diode in the rule.
- the rectifier circuit For connecting a coil of a relay to an AC voltage network, a rectifier circuit is used in the prior art.
- the rectifier circuit consists of a diode and a capacitor. The diode is only for the positive ones
- Half-waves of AC voltage permeable When the switching element is switched off, the capacitor charges up increasingly with each positive half-cycle, at least the exciter voltage of the relay having to be reached in order for the relay to attract when the switching element is switched on.
- relays that serve the state of the art in inverters for connecting alternative power sources to a 230V AC network. These are, for example, photovoltaic systems or fuel cells, for their economic use, a high overall efficiency is required. High holding power of the relay have a negative effect on the overall efficiency.
- the object of the invention is to provide a comparison with the prior art improved drive circuit for a relay.
- this is done with a drive circuit of the type mentioned, wherein an additional DC voltage source is provided, which is connected via a second diode in parallel to the first voltage source.
- an additional DC voltage source is provided, which is connected via a second diode in parallel to the first voltage source.
- the charging circuit in series with the first diode comprises a resistor which limits the charging current of the capacitor. This will prevent the current from the charging circuit, the capacitor with the switching element continuously recharges and thus keeps at the high level of the AC voltage source. A corresponding limitation of the charging current allows a discharge of the capacitor via the coil of the relay except for one
- the current for the further holding of the relay is thus taken from the DC voltage source except for the small proportion of the charging current.
- the voltage of the DC voltage source is less than the required excitation voltage of the relay and thus causes a lower holding power.
- the DC source must supply enough current to prevent the relay from dropping.
- the first diode and the capacitor to a conductor of the AC voltage source and is connected via the second diode to the DC voltage source and connected to a second terminal via the switching element to a reference potential and that the two terminals of the coil via a third diode for demagnetization with each other are connected.
- the coil demagnetizes after switching off the switching element via the third diode and is ready for the next cycle.
- the switching element it is advantageous to arrange a Zener diode parallel to the capacitor. This has a lower breakdown voltage than the peak value of the pulsed rectified AC voltage. The voltage to be switched by the switching element is then limited to this breakdown voltage, so that a cost-effective Switching element can be used, since then not the full peak value of the pulsed rectified AC voltage must be switched from this.
- Fig. 1 Exemplary arrangement of a drive circuit
- the relay in the exemplary embodiment is used, for example, as a switch for connecting a power source to a 230V AC mains.
- the power circuit is not shown for clarity.
- the 230V AC network with a conductor (Ll network ) and a neutral conductor as a reference potential (N network ) also forms the AC voltage source to which the drive circuit via a charging circuit consisting of a diode 5 and a resistor 7 (eg 400kOhm) is connected.
- This charging circuit charges a capacitor 4 (eg 4.7 ⁇ F).
- the capacitor 4 forms a first voltage source, to which the coil 1 of the relay is connected to a downstream switching element 2.
- the switching element 2 is, for example, a transistor.
- the base of the transistor is connected via a further resistor 3 to a control signal S.
- This control signal S is, for example, a square wave voltage between OV and plus 5V.
- the switching element 2 is turned off when the control signal S has a value of OV.
- Zener diode 9 is arranged parallel to the capacitor 4, a Zener diode 9 is arranged.
- the voltage applied to the switching element 2 voltage is limited to the breakdown voltage of the zener diode 9, whereby the switching element 2 can be dimensioned correspondingly small. It is also possible to connect several zener diodes in series to achieve a higher breakdown voltage (eg 4 x 62V).
- the coil 1 of the relay is connected in parallel to the capacitor 4 via a second diode 8 to a further DC voltage source U.
- the anode of the diode 8 is connected to the DC voltage source U.
- the DC voltage source U supplies, for example, a constant voltage value of 15V.
- relay circuits are used in devices that include additional circuitry for control, reporting or measuring tasks. Conveniently, then stands as a DC voltage source U, a positive potential at a point of this additional
- the coil 1 is demagnetized after switching off of the switching element. 2
- the capacitor 4 When switched off switching element 2 (control signal S equals OV), the capacitor 4 charges via the charging circuit.
- the diode 5 of the charging circuit is permeable to the positive half-waves of the AC voltage source, the other two diodes 6 and 8 are blocked.
- the capacitor 4 charges while until the voltage across the capacitor 4 corresponds to the breakdown voltage of the zener diode 9 and this is permeable or if the switching element turns on before reaching the breakdown voltage. It is important to ensure that the voltage across the capacitor 4 reaches at least the excitation voltage of the relay so that this can be tightened.
- the control signal S changes to plus 5V, the switching element 2 turns on and pulls the positive potential of the capacitor 4 via the coil 1 of the relay to the reference potential N network . Current flows through the coil 1 and after the elapse of a response time, the relay picks up.
- the current flow through the coil 1 empties the capacitor 4 until the positive potential applied to the capacitor 4 corresponds to the voltage of the DC voltage source U less the voltage drop at the second diode 8.
- the second diode 8 is then permeable, arranged parallel to the coil 1 third diode 6 blocks further.
- the capacitor 4 retains its voltage potential and the current through the coil 1 is taken from the DC voltage source U except for the portion of the charging current which continues to flow. The holding power is thus largely covered by the DC voltage source U.
- this type of holding current supply for example, for relays of the Finder 62.22.8.230.4300 or Tyco Electronics RM900271, can achieve a reduction of the holding power from approx. 2.8VA to 0.1W.
- the control signal S changes back to OV and the switching element 2 switches off.
- the relay drops out.
- the demagnetization of the coil 1 flows in the forward direction of the third diode 6 through the coil 1 until the magnetization energy is reduced and thus the diode 6 blocks again.
- the capacitor 4 is then charged again for the next turn on the charging circuit.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Relay Circuits (AREA)
- Selective Calling Equipment (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005043884A DE102005043884B4 (en) | 2005-09-14 | 2005-09-14 | Control circuit for a relay |
PCT/EP2006/064252 WO2007031356A1 (en) | 2005-09-14 | 2006-07-14 | Control circuit for a relay |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1925010A1 true EP1925010A1 (en) | 2008-05-28 |
EP1925010B1 EP1925010B1 (en) | 2010-11-17 |
Family
ID=37076322
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06764171A Not-in-force EP1925010B1 (en) | 2005-09-14 | 2006-07-14 | Control circuit for a relay |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1925010B1 (en) |
AT (1) | ATE488854T1 (en) |
DE (2) | DE102005043884B4 (en) |
WO (1) | WO2007031356A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE502008000959D1 (en) * | 2008-06-18 | 2010-08-26 | Sma Solar Technology Ag | Circuit arrangement with a bistable relay between a network and an inverter |
CN112992605B (en) * | 2021-05-06 | 2021-08-06 | 深圳市永联科技股份有限公司 | Isolation unit and related product |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2109580A1 (en) * | 1971-03-01 | 1972-09-14 | Noller W | High-speed excitation of DC-fed electromagnets |
AT359564B (en) * | 1978-09-08 | 1980-11-25 | Siemens Ag Oesterreich | ACTIVATION AND HOLDING CIRCUIT FOR SELF-HOLDING RELAYS |
DE2929261A1 (en) * | 1979-07-17 | 1981-02-05 | Licentia Gmbh | Relay operating circuit for high resistance power source - has relay operating RC circuit initiated by second RC circuit which switches transistor |
US4326133A (en) * | 1979-09-06 | 1982-04-20 | Rospatch Corporation | Control circuit for alternately actuating a pair of loads |
DE19604208C1 (en) * | 1996-02-06 | 1997-07-10 | Rowenta Werke Gmbh | Low-loss DC voltage supply circuit e.g. for small domestic appliance relay circuit |
DE29812029U1 (en) * | 1998-07-07 | 1998-11-05 | Bucher, Siegfried, Dipl.-Ing.(FH), 78652 Deißlingen | Electromechanical relay |
-
2005
- 2005-09-14 DE DE102005043884A patent/DE102005043884B4/en not_active Expired - Fee Related
-
2006
- 2006-07-14 WO PCT/EP2006/064252 patent/WO2007031356A1/en active Application Filing
- 2006-07-14 AT AT06764171T patent/ATE488854T1/en active
- 2006-07-14 DE DE502006008351T patent/DE502006008351D1/en active Active
- 2006-07-14 EP EP06764171A patent/EP1925010B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2007031356A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1925010B1 (en) | 2010-11-17 |
ATE488854T1 (en) | 2010-12-15 |
WO2007031356A1 (en) | 2007-03-22 |
DE502006008351D1 (en) | 2010-12-30 |
DE102005043884A1 (en) | 2007-03-22 |
DE102005043884B4 (en) | 2009-05-07 |
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