EP0776496A1 - Circuit for the drive of at least one electrically actuated magnet - Google Patents
Circuit for the drive of at least one electrically actuated magnetInfo
- Publication number
- EP0776496A1 EP0776496A1 EP95925839A EP95925839A EP0776496A1 EP 0776496 A1 EP0776496 A1 EP 0776496A1 EP 95925839 A EP95925839 A EP 95925839A EP 95925839 A EP95925839 A EP 95925839A EP 0776496 A1 EP0776496 A1 EP 0776496A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnet
- circuit arrangement
- switching element
- control
- signal
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
- F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
- F25D11/022—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures with two or more evaporators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
- F25D2400/04—Refrigerators with a horizontal mullion
Definitions
- Circuit arrangement for controlling at least one electrically controllable magnet
- the invention relates to a circuit arrangement for controlling at least one electrically controllable magnet with a targeted control power, by means of which the magnet switches a switching element into a desired switching position in which the switching element is held.
- Circuit arrangements according to the preamble of claim 1 are known for the control of bistable solenoid valves used in multi-temperature refrigerators, which serve to control the inflow of refrigerant to the evaporators arranged in compartments of different temperatures.
- Such circuit arrangements used in cooling devices have a logic part on the input side for evaluating control parameters such as temperature controller signals, with the aid of which a triac or two thyristors arranged antiparallel to one another on the circuit output side to act on the bistable Solenoid valve with the speaking control power are driven.
- a so-called "overhead ignition” can occur in their supply voltage as a result of mains voltage peaks, by means of which an undesired actuation pulse is generated on the solenoid valve, which then results from a desired temperature controller -Signal-related valve position is converted into its opposite switching position.
- Such an occurrence can result in the temperature in a freezer compartment of a two-temperature refrigerator rising above the permitted value, so that the goods stored therein are at least significantly impaired in appearance and taste, while on the other hand a drop in temperature in the refrigerator compartment of the device can lead to the destruction of containers cooled with liquid chilled goods.
- the invention has for its object to improve a circuit arrangement according to the preamble of claim 1 in such a way that an unintentional change in position of a required switching position of the electrically controllable magnet is avoided.
- This object is achieved according to the invention in that after the switching element has been switched into the desired switching position, the magnet is repeatedly acted upon at least briefly with control power corresponding to this switching position at predetermined switching positions.
- the solution according to the invention ensures that the electrically controllable magnet is always kept securely in its required switching position without additional monitoring and associated evaluation measures, so that undesired misalignments of the electrically controllable magnet, possibly leading to damage, are reliably prevented .
- semiconductor components are provided for supplying the magnet with control power, which after switching the switching element into the desired switching position are repeated at predetermined time intervals with one that is used to provide the control power Control signal are applied.
- an electromagnet can be controlled in a particularly inexpensive and simple manner, the control elements being quickly replaceable in the event of damage.
- the time intervals between the control signals are of the same length.
- the drive power is formed by the half-waves of an alternating voltage, a plurality of which are each generated directly one after the other as a signal sequence, two successive signal sequences being represented by a cycle time of the half-waves are long distance from each other.
- a circuit arrangement is particularly precisely controlled as required by the corresponding influencing variables if, according to a last advantageous embodiment of the subject matter of the invention, it is provided that the generation of the control signals are generated automatically by a control unit as a function of at least one control parameter.
- FIG. 2 shows a section of the electronic control device with an electronic circuit arrangement for generating control signals to secure the required switching position of a bistable solenoid valve which controls the flow of refrigerant to the cooling compartments,
- FIG. 3 shows the control signals corresponding to the two switching positions of the bistable solenoid valve, each schematically plotted on a time axis.
- FIG. 1 shows a refrigerator and freezer combination 10, the heat-insulating housing 11 of which has two storage compartments which are thermally separated from one another by a heat-insulating partition 12, are arranged vertically one above the other and can be closed with separate doors 13 and 14.
- the higher-lying storage compartment, which can be closed with the door 13 is designed as a cooling compartment 15, which is equipped with storeys 16 which are arranged one above the other in vertical intervals and serve to store refrigerated goods.
- the other storage compartment 13 arranged below the cooling compartment 15, separated from it by the heat-insulating intermediate wall 12 and lockable with the door 14, is designed as a freezer compartment 17, which is equipped for the storage of frozen goods with pull-out pull-out frozen food containers 18.
- Both the cooling compartment 15 and the freezer compartment 17 are equipped with evaporators (not shown), which are integrated in a refrigeration circuit (also not shown), within which one supplies the evaporators with liquid refrigerant, in order to maintain their intended storage room temperature Compressor is arranged, which is operated intermittently, the on and off phases of the compressor being dependent on the temperatures prevailing in the storage compartments.
- evaporators not shown
- a refrigeration circuit also not shown
- Compressor is arranged, which is operated intermittently, the on and off phases of the compressor being dependent on the temperatures prevailing in the storage compartments.
- the digital signals "A” and “B” on the output side of the evaluation logic 19 represent input signals for the circuit arrangement 30, a positive output signal “A” being a cooling request for the cooling compartment 15 signals, while a positive output signal “B” means a cooling requirement for the freezer compartment 17.
- the output signal "A” present at the evaluation logic 19 is assigned to an input of a NAND gate 31 for its further processing via a current limiting resistor 30.1. leads, the second input of which is supplied with an input signal "C”. This can assume both the voltage level logic "1” and the voltage level logic "0", which are each generated by a NAND switch trigger 32 merged at its two inputs, the duration of the respective signal state is of different lengths.
- this period of time results from the charging time of a resistor 33 connected through an ohmic resistor 33 and a capacitor 34 connected to ground potential with its cathode, the RC element for determining the direction of the charging current having one with its Cathode connection to the ohmic resistor 33 coupled diode 35 is connected upstream.
- the duration of the logic level "0" for the input signal "C” is determined by an RC element which is formed from the capacitor 34 and an ohmic resistor 36, the resistance value of which for generating a longer period of time for the logic level 0 is clearly above that of Ohm's resistance 33.
- the evaluation logic 19 with its output providing the digital signal "A" is connected via a diode 37 coupled with its anode connection to this output to a circuit section belonging to the circuit arrangement 30, which section is required for evaluating the operation of household appliances ⁇ Chen AC voltage is used, which through a "L" line pole of the AC voltage network to a current limiting for the operation of logic stone serving resistor 38 is coupled.
- This is connected to two diodes 39 and 40 arranged in series, the diode 39 with its cathode connection with the positive pole of a direct voltage source U
- Anode connection is connected to ground potential, which at the same time forms the zero pole "N" of the AC voltage.
- the potential which arises at the connection point between the diodes 39 and 40 arranged in series is fed on the input side to a NAND-Schmitt trigger 41, the two inputs of which are connected to one another.
- the output of the NAND-Schmitt trigger 41 is connected to the cathode connection of a diode 41.1, which is connected on the anode side to an input of a NAND-Schmitt trigger 42, which at the same time also applies the output signal "B" from the evaluation logic 19 is.
- the signal "C” is present at the other input of the NAND-Schmitt trigger 42.
- the output of the NAND-Schmitt trigger 42 like that of the NAND-Schmitt trigger 31, is connected to the base of a pnp transistor 43, the emitter connection of which to one
- the input signal "C" at the input of the NAND-Schmitt trigger 31, which is generated automatically by the circuitry of the NAND-Schmitt trigger 32, is only high during the charging time of the capacitor 34 above the resistor 33 (logic "1"), while it has a low level for the discharge duration of the capacitor 34 over the resistor 36, both level states by exceeding or falling below a predetermined switching threshold on the initially linked NAND-Schmitt trigger 32 are effected.
- the output signal of the NAND-Schmitt trigger 31 is also influenced by the evaluation of the AC mains voltage for operating the fridge-freezer combination (for example 230 volts), both the diode 40 and the diode 37 being affected by the negative half-wave of this sinusoidal AC voltage is set in the conductive state, so that at the input of the signal "A" of the NAND-Schmitt trigger 31 there is a low level for approximately the duration of this half-wave, as a result of which the output of the NAND-Schmitt trigger 31 is at a high level passes over and thus blocks the PNP transistor 43.
- the AC mains voltage for operating the fridge-freezer combination for example 230 volts
- the positive half-wave of the sinusoidal AC voltage can have no influence on the low level originally set at the output of the NAND-Schmitt trigger 31, so that the pnp transistor 43 thus switched through and the ignition of the triac 45 thereby caused one Energizing the bistable solenoid valve 46 causes where takes place by the desired change in position of the valve actuator for redirecting the refrigerant to the evaporator of the cooling compartment 15.
- the solenoid valve 46 is corresponding to the positive half-waves of the sinusoidal alternating voltage which follow one another at equal time intervals, as shown in FIG. 3 under position "1" are shown, acted upon, whereby the valve actuator of the solenoid valve 46, which serves as an armature for the electro-magnets, is held in the desired switching position as required.
- the signal "C” has a low level, as a result of which a high level is set at the output of the NAND-Schmitt trigger 31, which is the PNP transistor 43 is set in the blocking state, so that the solenoid valve 46 is not acted upon by drive power for this period. After this time t has elapsed, the signal "C" again shows high-pe
- the course of the sinusoidal AC voltage is evaluated by the series connection of the diodes 39 and 40, with the connection of the NAND-Schmitt trigger 41 in conjunction with the diode 41.1 only the negative half-wave at a corresponding level of the signal "C" on Output of the NAND-Schmitt trigger 42 is capable of causing a low level and thus switching the pnp transistor 43 through, while the positive half-wave of the sinusoidal AC voltage cannot cause any control of the transistor 43 serving as an electronic switch.
- the NAND-Schmitt trigger 41 By connecting the NAND-Schmitt trigger 41 with the diode 41.1 on the output side, at a high level to the output "B" of the evaluation logic 19, the corresponding input signal
- the signal at the NAND-Schmitt trigger 42 follows the output signal of the NAND-Schmitt trigger 41, while a low level at the output "B” ensures that this is independent of the output signal of the NAND-Schmitt trigger 41 at the input of the NAND-Schmitt-Triggers 42 remains intact.
- Analogous to the control of the solenoid valve 46 with the positive half-waves according to the position "1" shown in FIG. 3, the negative half-waves (FIG. 3 position "0") are used as control power only for the period of a high -Level at the output of the NAND-Schmitt trigger 32 supplied to the solenoid valve 46.
- this is from time to time with a signal sequence serving as control power in the form of the negative half-waves of the sinusoidal AC voltage, the length of the signal sequence being determined by the duration of the high level for the signal "C" and the duration t between the signal
- P follow is determined by the duration of the low level for the signal "C".
Abstract
Description
Claims
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4429918 | 1994-08-23 | ||
DE4429918A DE4429918A1 (en) | 1994-08-23 | 1994-08-23 | Circuit arrangement for controlling at least one electrically controllable magnet |
PCT/EP1995/002620 WO1996006388A1 (en) | 1994-08-23 | 1995-07-06 | Circuit for the drive of at least one electrically actuated magnet |
US08/805,328 US5889646A (en) | 1994-08-23 | 1997-02-24 | Circuit configuration and method for triggering at least one electrically triggerable magnet |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0776496A1 true EP0776496A1 (en) | 1997-06-04 |
EP0776496B1 EP0776496B1 (en) | 1998-09-30 |
Family
ID=25939458
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95925839A Expired - Lifetime EP0776496B1 (en) | 1994-08-23 | 1995-07-06 | Circuit for the drive of at least one electrically actuated magnet |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0776496B1 (en) |
CN (1) | CN1160444A (en) |
BR (1) | BR9508737A (en) |
DE (1) | DE59503808D1 (en) |
ES (1) | ES2125027T3 (en) |
PL (1) | PL178333B1 (en) |
TR (1) | TR199500942A2 (en) |
WO (1) | WO1996006388A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010001458A1 (en) * | 2010-02-01 | 2011-08-04 | BSH Bosch und Siemens Hausgeräte GmbH, 81739 | Refrigerating appliance and chiller for it |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3127024A1 (en) * | 1981-07-09 | 1983-01-20 | Brown, Boveri & Cie Ag, 6800 Mannheim | CIRCUIT FOR OPERATING, MONITORING AND TROUBLESHOOTING A SINGLE-CHANNEL AIR-CONDITIONER |
JPS61244983A (en) * | 1985-04-19 | 1986-10-31 | Nissan Motor Co Ltd | Solenoid control valve device |
JPS62288783A (en) * | 1986-06-06 | 1987-12-15 | Mitsubishi Mining & Cement Co Ltd | Solenoid valve apparatus for gas |
IT1203572B (en) * | 1986-06-11 | 1989-02-15 | Elbi Int Spa | REFRIGERANT CIRCUIT FOR REFRIGERATING PLANTS INCLUDING A FLURALITY OF REFRIGERANT ENVIRONMENTS AND SOLENOID VALVE |
US4838037A (en) * | 1988-08-24 | 1989-06-13 | American Standard Inc. | Solenoid valve with supply voltage variation compensation |
-
1995
- 1995-07-06 ES ES95925839T patent/ES2125027T3/en not_active Expired - Lifetime
- 1995-07-06 WO PCT/EP1995/002620 patent/WO1996006388A1/en active IP Right Grant
- 1995-07-06 BR BR9508737A patent/BR9508737A/en not_active IP Right Cessation
- 1995-07-06 EP EP95925839A patent/EP0776496B1/en not_active Expired - Lifetime
- 1995-07-06 DE DE59503808T patent/DE59503808D1/en not_active Expired - Lifetime
- 1995-07-06 CN CN95194742A patent/CN1160444A/en active Pending
- 1995-07-06 PL PL95318462A patent/PL178333B1/en not_active IP Right Cessation
- 1995-08-02 TR TR95/00942A patent/TR199500942A2/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9606388A1 * |
Also Published As
Publication number | Publication date |
---|---|
PL178333B1 (en) | 2000-04-28 |
PL318462A1 (en) | 1997-06-09 |
CN1160444A (en) | 1997-09-24 |
BR9508737A (en) | 1997-11-11 |
EP0776496B1 (en) | 1998-09-30 |
WO1996006388A1 (en) | 1996-02-29 |
ES2125027T3 (en) | 1999-02-16 |
DE59503808D1 (en) | 1998-11-05 |
TR199500942A2 (en) | 1996-06-21 |
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