KR20150058434A - Control circuit for at least two contactors and method for operating at least two contactors - Google Patents

Abstract

The present invention relates to a control circuit (30) for two or more contactors, said control circuit comprising at least one first output (15) and at least two second outputs (16) The control circuit 30 may be connected to the terminals of two or more control bobbins for two or more contactors. The control circuit 30 also comprises a holding voltage unit 10 which is connected to one or more first outputs 15 via its output 6 and which is connected to a holding current To its own output (6). According to the invention, the control circuit 30 comprises an adjusting circuit 20, which is connected to the input 9 of the electrical contact 8 and the holding voltage unit 10, To generate a control signal in accordance with the current flowing into the sustain voltage unit 10 and to transmit the control signal to the sustain voltage unit 10. [ The invention also relates to a method for operating two or more contactors.

Description

Technical Field [0001] The present invention relates to a control circuit for two or more contactors and a method for operating two or more contactors.

The present invention relates to a control circuit for two or more contactors, the control circuit comprising an adjustment circuit by means of which the current can be adjusted through the control bobbin of the contactor.

The prominent fact is that in the future not only in static applications but also in vehicles such as hybrid vehicles and electric vehicles, the use of battery systems with very high requirements in terms of reliability will increase. The background to this fact is that failure of the battery can cause safety-related problems. In order to provide the output required in the individual applications, typically a number of battery cells are connected in series, which results in a high output voltage of the battery, It is continuously applied to the corresponding power supply line of the supplied device and can be a risk to the administrator or the user. For this reason, in general, a contactor is provided so as to be able to electrically disconnect the battery. In the case of an automobile equipped with an electric drive motor, a contactor is normally installed not only on the positive pole of the battery but also on the negative pole. This contactor is designed for the high voltage of the battery and reliably separates the battery from the short- Should be able to do.

Switching on and off of the contactor is typically via an electronic output or through a control circuit that supplies current to the control bobbin of the contactor. At this time, the control output is not negligible. However, in order to reliably start the contactor in the switch-on process, a much higher control current is needed than is necessary to keep the contacts in a closed state. For this reason, it is common to subdivide the control of the contactor into two modes, i.e., the start mode and the hold mode (or the start phase and the hold phase). What is characteristic of the individual mode is that the level of the control current is higher during the startup mode than during the maintenance mode. It is referred to herein as a start level and a maintenance level. At this time, the start mode is required only for switching on (closing) the contactor, and the period is relatively short. During most periods of use, the contactor is operated in the hold mode, which saves power. Therefore, the control circuit for controlling the contactor must be able to provide two operating modes.

German Published Patent Application DE 10 2010 041 018 A1 discloses an apparatus for controlling a contactor comprising a holding current unit designed to output a holding current for a control bobbin of a contactor to its output side output. With the arrangement disclosed in German Patent Application DE 10 2010 041 018 A1, one or more contactors can preferably be controlled at different voltage levels of constant voltage during the start-up phase and during the maintenance phase.

However, the components used inside the device disclosed in German Patent Application DE 10 2010 041 018 A1 have in particular a variation in the winding resistance, temperature dependence and component parameters resulting from the manufacture of the control bobbin of the contactor. Further, the holding voltage generated by the holding current unit is adjusted to a value determined for production time. Therefore, the associated components must be designed such that the necessary holding current can be provided by the holding current unit even when extreme temperatures are present. However, since the conductivity of the components and the resulting current flow are varied by temperature, for example, as caused by the control bobbin of the contactor, the components must be dimensioned larger than needed for the originally required current.

For this reason, for example, the parts used in the holding circuit of the device disclosed in German Patent Application DE 10 2010 041 018 A1 must be dimensioned to 66% larger, Space and cost.

The present invention seeks to provide a control circuit for two or more contactors and a method for operating two or more contactors in order to be able to solve at least part of the above problems.

According to the invention, there is provided a control circuit for two or more contactors, the control circuit comprising a first and a second terminal through which a control circuit can be connected to the poles of the energy storage device. The control circuit also includes one or more first outputs and two or more second outputs through which the control circuit may be connected to the terminals of two or more control bobbins for two or more contactors. And the two or more second outputs are connected to the second terminals through respective one electrical connections. The control circuit also includes a holding voltage unit having an input for receiving an output and a control signal and being connected to one or more first outputs through its output, It is designed to provide a holding voltage to its output to adjust the holding current. According to the invention, the control circuit comprises an adjusting circuit, which is connected to the input of the electrical contact and the holding voltage unit, for generating a control signal in accordance with the current flowing into the electrical contact, It is designed to transmit to the holding voltage unit.

An advantage of such a control unit is that subsequent control of the holding voltage unit via the regulating circuit is made possible by the current flowing through the control bobbin of the contactor. Therefore, the holding current caused by the holding voltage provided by the holding voltage unit or the holding voltage provided can be adjusted by the control bobbin connected to the control circuit, according to the current flowing through the control bobbin itself. Thus, it can be ensured that the current can be accurately adjusted by the control bobbin at each time point. The components used for the implementation of the control circuit no longer need to be temporarily excessively dimensioned, which can significantly reduce the cost and necessarily the required installation space for the implementation of the control circuitry.

In a preferred embodiment, the holding voltage unit is designed to change the amount of the holding voltage provided at its output to correspond to the control signal when receiving the control signal. Thereby, for example, a linear adjustment of the holding voltage unit or the holding voltage provided and the holding current outputted to the inside of the first output together therewith becomes possible. At this time, the type of control signal determines the type of change of the holding current.

Preferably, the regulating circuit comprises a minimum current-selection circuit, which has an output and is adapted to measure the actual value of the current flowing through the electrical contact and to determine a minimum value of the measured current actual value, I _min ) Through its own output.

Preferably, the minimum current-selection circuit comprises a resistor and a diode for each respective electrical connection, wherein each one of the electrical connections is connected to the cathode of one of the diodes, Respectively. A minimum current-selection can be implemented by such a diode circuit because the minimum input variable among the input variables applied to the input is always output at the output of the diode circuit.

Particularly preferably, the minimum current-selection circuit comprises a resistor and a precision rectifier having two inputs and one output each for each electrical connection, wherein each one electrical connection is connected to a respective one input of the precision rectifier While each other input of the individual precision rectifier is returned to the output of the individual precision rectifier, in which case the output of every precision rectifier is connected to one terminal of the resistor.

Preferably, the precision rectifier is implemented as an operational amplifier that is back coupled, in which case the anti-coupling branches of the operational amplifier each have one diode, in which case the cathodes of the diodes each have their own While the anode of the diode is connected to the inverting input of its separate operational amplifier. With such a precision rectifier circuit, the minimum current selection can likewise be realized and also the forward bias of the mounted diode can be compensated at room temperature, that is, in the offset state of the diode. Thereby, a minimum current-selection circuit implemented by a precision rectifier with a diode can be provided, which allows a very accurate measurement of the actual value of the current flowing through the electrical connection. In addition, the operational amplifier used at this time is stable in the short-circuit, does not require frequency compensation, has a large input voltage range, and consumes less power.

In a preferred embodiment of one of the preceding embodiments, the regulating circuit comprises a first regulating circuit, the input of which is connected to the output of the minimum current-selecting circuit, - connected to the input of the select circuit. Preferably, the first adjusting circuit generates a first control signal for comparing a current flowing into the input of the first comparator with a reference value, and adjusting a holding voltage for the holding voltage unit according to the comparison result, Signal to the holding voltage unit. Thereby, an external control loop is implemented inside the control circuit, which is operated by the holding current returned through the control bobbin and can be regarded as a superimposed external current controller.

In one preferred refinement of this embodiment, the reference value corresponds to the minimum required holding current I _{min of the} contactor to be controlled. Thereby, either the holding voltage provided by the holding voltage unit or the holding current generated by this holding voltage unit is always equal to or larger than the holding current I _Hmin required by the control bobbin of the contactor connected to the control circuit at all times It becomes possible to adjust the holding voltage unit. Where I _Hmin is the current that must flow through at least the control bobbin in order to maintain the individual contactor during the hold phase in the actuated state.

In a preferred refinement of this embodiment, the first control signal always corresponds to the control signal for the holding voltage unit, which is necessary to adjust the minimum required holding voltage at the output of the holding voltage unit at all times. In this way, a situation in which the minimum required holding current (I _Hmin ) always flows through the control bobbin can be ensured through the second adjusting circuit. According to such an embodiment, a disturbance involved in the internal regulation loop, for example a variation of the input voltage of the holding voltage unit, can also be directly regulated in the interval. The internal control loop is directly responsive to the difference between the hold voltage provided by the hold voltage unit and the target value and in this case this direct response is the deviation of the hold current flowing through the control bobbin and the disturbance involved in the external control loop It does not cause. At this time, the minimum required holding voltage is required to cause the flow of current in each control bobbin of the contactor connected to the control circuit - this current corresponds at least to the minimum required holding current (I _Hmin ) , Corresponding to the voltage at the output of the holding voltage unit.

Preferably, the regulating circuit comprises a second regulating circuit, which compares the first control signal generated by the first regulating circuit with the holding voltage provided at the output of the holding voltage unit, To superimpose an additional control signal on the first control signal. Thereby, an internal regulating loop is implemented inside the control circuit, which is operated by the holding voltage provided at the output of the holding voltage unit, and can be regarded as a superimposed internal current regulator. In this case, the control variable or input variable of the second adjustment circuit is the first control signal generated by the first adjustment circuit. In other words, the internal adjustment loop is related to its input value resulting from the external adjustment loop.

Preferably, the average period (T ₂ ) lying between the formation of two successive additional control signals by the second adjustment circuit is between the formation of two successive first control signals by the first adjustment circuit Is less than the mean period (T ₁ ) lying by a factor X, where X is greater than 0 and less than 1 (0 <X <1). Thereby, the time characteristic between the first adjusting circuit and the second adjusting circuit across X is determined, and in this case, the first adjusting circuit always operates slower than the second adjusting circuit. In other words, in this embodiment, the inner adjustment loop is faster than the outer adjustment loop. Therefore, the first control signal generated and transmitted by the first arbitration circuit is always checked by the second arbitration circuit and corrected in some cases.

Preferably, the holding voltage unit is implemented as a switching converter.

The invention also relates to a method for operating two or more contactors, the method comprising two or more control bobbins for controlling two or more contactors and a holding voltage unit, Is connected to two or more control bobbins and is designed to cause a current flow through two or more control bobbins by a holding voltage generated at its output. The method includes the following method steps: providing a starting current flowing through two or more control bobbins by a holding voltage unit. Providing a holding current flowing through two or more control bobbins by a holding voltage unit. Comparing / comparing the holding currents flowing through the two or more control bobbins with each other or selecting a minimum current among the holding currents flowing through the two or more control bobbins. Comparing the minimum holding current to the reference current. Generating a first control signal for the holding voltage unit to control the holding voltage at the output of the holding voltage unit according to the result of comparing the minimum holding current among the holding currents flowing through the two or more control bobbins to the reference current. Comparing the first control signal with a holding voltage present at the output of the holding voltage unit. Generating a second control signal for the hold voltage unit to control the hold voltage at the output of the hold voltage unit according to a result of the comparison between the first control signal and the hold voltage present at the output of the hold voltage unit.

Preferably, the starting current has a larger value than the holding current. Preferred embodiments of the invention are described in the dependent claims and described in the description.

The effects of the present invention are specified separately in the relevant portions of the specification.

Embodiments of the present invention will be described in detail with reference to the drawings and the following description. Drawing Description:
1 is a schematic view showing a control circuit according to the prior art,
Figure 2 is a schematic diagram showing one embodiment of a control circuit according to the invention for two contactors, and
3 is a schematic diagram showing a specific embodiment of a control circuit according to the present invention.

In Fig. 1, a control circuit 30 according to the prior art is shown. A control circuit 30 for controlling two contactors, each of which is shown only as a control bobbin 50, is connected to a voltage source 60 via first and second terminals 11 and 12, But also provides a current controlled by the control circuit 30 for controlling the contactor. The control bobbin 50 of the contactor is connected to the control circuit 30 via one first output 15 and two second outputs 16. The control circuit 30 comprises a first switch 41 and two second switches 42 in which case the first switch 41 is connected to the first pole of the voltage source 60 and the control circuit 30, While the two second switches 42 are connected between the second pole of the voltage source 60 and the second output 16 of the control circuit 30, respectively, In other words, within each one of the electrical connections 8, between one of the outputs 16 and the second terminal 12, respectively. When the three switches 41 and 42 are simultaneously closed, the control bobbin 50 is directly connected to the voltage source 60, and the maximum current of a sufficient magnitude to start the contactor of the control bobbin 50 starts to flow, The contactor is brought into a conducting state.

The control circuit 30 also has a holding voltage unit 10 which is similarly supplied with power from the voltage source 60. [ The holding voltage unit 10 causes a flow of a holding current that causes the contactor to remain closed during the holding step following the starting step. At this time, since the inertia of the electromechanical contactor does not need to be overcome, such as during the start-up phase, even a small amount of current flowing through the control bobbin 50 is sufficient to maintain the contactor in a closed state, Consumption can be reduced. As a result, during the holding step, only the holding current flows in the control bobbin 50 as a result of the first switch 41 being opened again (and possibly by the operation of the holding voltage unit 10). At this time, the holding current flows through the diode 45, and this diode is connected between the holding voltage unit 10 and the control bobbin 50, and the problem of preventing the current from flowing into the output of the holding voltage unit 10 .

In addition, a free wheeling diode 46 is provided in FIG. 1 which provides a return path for the current flowing inside the control bobbin 50 in the event of the switch-off of the holding current . The off step is also started when the second switch 42 is opened, and in some cases, stopping further to the holding voltage unit 10. The control bobbin causes current flow even after it is disconnected from the supply voltage because the control bobbin 50 prevents variations in the current flowing through it due to its own inductance which then flows to the reflux diode 46 and And is also connected to the diode 45 due to the series circuit. Since the second terminal of the control bobbin 50 must also conduct current, a high negative voltage is generated in this case, and such a high negative voltage is applied to the terminal voltage element 47 Causing a flashover of the Zener diode used as the &lt; RTI ID = 0.0 &gt; diode. &Lt; / RTI &gt; The current flow through the control bobbin 50 is rapidly reduced so that the magnetic field of the control bobbin 50 is also reduced and the voltage of the individual contactor also drops so that the contactor is opened.

The first switch 41, the second switch 42 and, optionally, the holding voltage unit 10 are controlled by one control unit 35.

2 shows an embodiment of a control circuit 30 according to the invention for two contactors. The control circuit 30 according to the present invention has first and second terminals 11 and 12 through which the control circuit 30 is connected to the pole of the energy storage device, Can be connected. The control circuit 30 according to the present invention also has a first output 15 and two second outputs 16 through which the control circuit 30 is connected to two Can be connected to the terminals of the control bobbins. In this case, the first output 15 may be connected to the first end or to the first terminal of the two control bobbins, respectively, while the second end of the first control bobbin is connected to the first end of the second output 16 While the second end of the second control bobbin may be connected to the second end of the second output. At this time, the two second outputs 16 are respectively connected to the second terminal 12 of the control circuit 30 through one electric contact 18. The control circuit 30 according to the invention also comprises a holding voltage unit 10 which comprises one output 6 and one input 9 for receiving a control signal. Through the output 6, the holding voltage unit 10 is connected to the first output 15. The holding voltage unit 10 is designed to provide a holding voltage to its output 6 to adjust the holding current for the control bobbin. In other words, the holding voltage unit 10 is designed to output a holding voltage, through its output 6, which causes a current flow through the control bobbin when the control bobbin is connected to the control circuit 30 . According to the invention, the control circuit 30 also comprises an adjusting circuit 20, which is connected on the input side to the electrical contact 8 and on the output side the output 9 of the holding voltage unit 10, Respectively. In other words, the regulating circuit 20 is connected to a respective one of the electrical connections 8 of the control circuit 30 via one of its inputs, each one of its inputs, Is connected to the input (9) of the holding voltage unit (10). The control circuit 20 is adapted to generate a control signal which is dependent on the current flowing in the control bobbin and which flows in and is connected to the control circuit 30 within the electrical contact 8, Voltage unit 10 as shown in FIG. In other words, the regulating circuit 20 is designed to produce a control signal that depends on the current flowing through the electrical contact 8 and to provide this control signal to the sustaining voltage unit 10 via the input 9 . In other words, the characteristics, i. E. The amplitude of the control signal produced by the regulating circuit 20, for example, depends on the current flowing through the electrical contact 8.

At this time, the control circuit 30 according to the present invention is not limited to controlling only two contactors. The control circuit 30 according to the present invention may also be implemented for controlling, for example, four, eight or n contactors which may be connected to two or more control bobbins.

3 shows a specific embodiment of the control circuit 30 according to the present invention. This embodiment shows a control circuit 30 according to FIG. 1 substantially similar to that of FIG. 2, but with a more specific adjustment circuit 20 complemented. The description of the control circuit 20 or its components in terms of characteristics and interrelationships may be taken from the description of FIGS. 1 and 2 and from FIGS. 1 and 2 themselves. Since the same components as in Fig. 3 correspond to the components in the first embodiment of Fig. 2 and to the components in the example of the control circuit 30 according to the prior art shown in Fig. 1, 1 and 2 can be applied to the second embodiment of FIG. In this embodiment, the control circuit 30 is connected to two control bobbins 50 through its first and second outputs 15, 16, while its first and second terminals 11, , 12 are connected to an energy storage device 60 implemented as a voltage source. In this case, not only the control bobbin 50 but also the energy storage device 60 can be regarded as part of the control circuit 30, respectively.

In the embodiment of the control circuit 30 according to the invention shown in Fig. 3, the control circuit comprises an adjustment circuit 20, which comprises a minimum current-selection circuit 5 on its side and a first current- And second adjusting circuits (1, 2). In this embodiment, the minimum current-selection circuit 5 has one shunt resistor for each electrical contact 8, one for each shunt resistor, And is placed between the switching means 42 of the individual electrical contact 8 and the terminal 12 of the control circuit 30, respectively. The input of the minimum current-selection circuit 5 is connected to the measurement terminal of the shunt resistor by its own input, respectively. In this case, the input of the minimum current-selection circuit 5 is connected to one of the precision rectifiers (7). In other words, the minimum current-selection circuit 5 has one precision rectifier 7 for each electrical connection 8, one input of each of the precision rectifiers 7 being connected to a respective one of the shunt resistors 7 And is connected to one electrical connecting portion 8 through a measuring terminal. The precision rectifier 7 also has one second input and one output, each individual second input being returned to the output of a respective precision rectifier 7. The minimum current-selection circuit 5 also has one resistor 4, in which case the output of all the precision rectifiers 7 is connected to the first terminal of the resistor 4. In other words, each precision rectifier 7 inside the minimum current-selection circuit 5 is connected to the same terminal of the resistor 4 through its respective output.

In this embodiment, the precision rectifier 7 is implemented as a semi-coupled operational amplifier, in which the inverting inputs of the operational amplifiers are each returned to the output of a respective operational amplifier. The diodes 3 are arranged one by one in the semi-coupling branches or in the half-coupling part of the operational amplifier, and the anode of this diode is connected to the individual inverting input of the individual operational amplifier or to the terminal of the resistor 4 On the other hand, the cathodes of the diodes 3 are connected to the respective output terminals of their respective operational amplifiers. The other terminal of the resistor 4 which is not connected to the precision rectifier 7 is connected to the output of the minimum current selection circuit 5 through which the minimum current- Is connected to the input of the circuit (1). The minimum current selection circuit 5 is configured to measure the actual value of the current flowing through the electrical contact 8 in this embodiment through the shunt resistor and to set the minimum actual value I _min to the minimum current - output through the output of the selection circuit (5). In this embodiment, the minimum current-selection is realized through the diode 3 inside the precision rectifier 7. At this time, the minimum input value among the input values is outputted to the input of the precision rectifier 7 through the output of the minimum current-selection circuit 5. The use of a precision resistor 7 as well as the use of a shunt resistor to measure the actual value of the current is also an option for implementing the minimum current-selection circuit 5 of the control circuit 30 according to the present invention . Implementation of the precision rectifier 7 as an operational amplifier with a diode 3 has also been chosen purely by way of example in this embodiment. The control circuit 30 according to the invention may be implemented with a differentially implemented minimum current-selection circuit 5 using only the diode 3, Measurement of the current actual value can also be done in a different manner and manner than through the shunt resistor.

The minimum current-selection circuit 5, via the output of the minimum current-selection circuit 5, transmits the minimum actual value I _min among the measured current actual values to the first regulation circuit 1, Is connected to the input (9) of the holding voltage unit (10). In this embodiment, the first adjustment circuit 1 is designed to compare the minimum actual value I _min among the measured current actual values transmitted to itself through its input to a reference value, and in this embodiment, Is provided to the regulating circuit by the reference transmitter 13 purely by way of example. In other words, in the present embodiment, the first adjustment circuit 1 is designed to compare the current half-coupled to its input to a reference value. As a reference value in this embodiment, the minimum required holding current I _Hmin required for the minimum of the contactor to be controlled is used, i.e., the control bobbin 50 is kept in a closed state during the maintenance phase, A current which must flow at least through the control bobbin 50 of the contactor is used. The first adjustment circuit 1 also outputs a first control signal depending on a result of comparison _{between the} minimum required holding current I _Hmin and the minimum actual value I _min among the measured current actual values, (10), and is designed to transmit this control signal to the sustaining voltage unit (10) via an input (9). At this time, the characteristics of the first control signal generated by the first adjusting circuit 1 coincide with the comparison result. For example, in this embodiment, the greater the difference between the minimum actual value I _min and the minimum required holding current I _Hmin among the measured current actual values, the larger the value of the first control signal becomes. In other words, in the present embodiment, the first adjustment circuit 1 has a minimum actual value I _{min of the} measured current actual value and a minimum maintenance value of the contactor required in this embodiment Is designed to generate a first control signal which is dependent on the comparison result between reference values corresponding to the current (I _Hmin ) and to provide this control signal to the holding voltage unit (10). In this embodiment, the holding voltage unit 10 sets the value of the holding voltage supplied to its output 6 by this holding voltage unit and the value of the holding current flowing into the first output 15 together with it, And is designed to change in synchronization with the first control signal when receiving the first control signal. In this embodiment, the holding voltage unit 10 is implemented as a switching converter, purely as an example, and the first control signal corresponds to a mark-to-space ratio that determines the controllability of the switching converter. In this embodiment, the adjustment of the holding current is made in a manner consistent with the first control signal obtained, for example, by changing the holding voltage at the output of the holding voltage unit 10 as an example. The control circuit 30 also includes a second regulating circuit 2 which regulates the first control signal generated by the first regulating circuit 1 by the holding voltage unit 10 And to superimpose an additional control signal on the first control signal in accordance with the comparison result. In other words, through the second adjusting circuit 2, the first control signal generated by the first adjusting circuit 1 can be corrected by overlapping with the correction signal. At this time, the first control signal, which is compared with the sustain voltage provided by the sustain voltage unit 10 in this embodiment, is adjusted by adjusting the minimum required sustain voltage at the output 6 of this sustain voltage unit 10 Which corresponds to the control signal for the sustain voltage unit 10 which is necessary for the sustain voltage unit 10. In other words, the first control signal is always applied to the input 9 of the holding voltage unit 10 so that the holding voltage unit 10 provides the minimum required holding voltage at its output 6 Corresponds to a signal that has to be applied. At this time, the minimum required holding voltage is sufficient to hold at least the holding voltage unit 10, so that the current flowing through the control bobbin 50 of all the contactors is sufficient to keep each contactor stationary during the holding phase, The output 6 must be present. At this time, in the present embodiment, the average period (T ₂ ) lying between the formation of two consecutive additional control signals by the second arbitration circuit 2 is set by the first arbitration circuit 1, Is smaller than the average period (T ₁ ) lying between the formation of successive first control signals by a factor X, where X is greater than 0 and less than 1 (0 <X <1). In other words, since the first adjusting circuit 1 operates slower than the second adjusting circuit 2, the second adjusting circuit 2 always corrects the control signal generated by the first adjusting circuit 1 .

Thus, through cooperation of the minimum current-selection circuit 5, the first regulating circuit 1 and the second regulating circuit 2, it is possible to control the two-loop type or cascade type regulating system And by such an adjustment system, the current flowing through the electrical contact 8 and the control bobbin 50 along with it during the holding step of the contactor can be adjusted to an optimum value. At this time, the first adjusting circuit 1 closes the external adjusting loop which uses the holding current flowing through the control bobbin 50 connected to the control circuit 30 as the adjusting variable, while the second adjusting circuit 2 And closes the internal regulating loop which uses the holding voltage provided by the holding voltage unit 10 as a regulating variable.

However, the first tuning circuit 1 as well as the second tuning circuit 2 are also optional for the control circuit 30 according to the present invention. In addition, the control circuit 30 according to the present invention with the regulating circuit 20 can be implemented without the elements capable of adjusting or regulating the minimum current flowing through, for example, the electrical contact 8. In this embodiment, not only the first adjusting circuit 1 but also the second adjusting circuit 2 operate continuously. More specifically, the individual reference value and the input variable are continuously compared, and according to the comparison result, In succession.

Claims (12)

A control circuit (30) for two or more contactors,
- a first and a second terminal (11, 12) through which the control circuit (30) can be connected to the pole of the energy storage device,
, Characterized in that it comprises at least one first output (15) and two or more second outputs (16), through which the control circuit (30) is connected to the terminals of two or more control bobbins for two or more contactors Wherein the two or more second outputs 16 are each connected to the second terminal 12 through one electrical contact 8,
- a holding voltage unit (10), said holding voltage unit having one output (6) and one input (9) for receiving a control signal, and having its output (6) 1 output 15 and is designed to provide its own output 6 with a holding voltage for adjusting the holding current for the control bobbin,
The control circuit 30 comprises an adjusting circuit 20 which is connected to the input 9 of the electrical contact 8 and the holding voltage unit 10 and flows into the electrical contact 8 Is designed to generate a control signal in accordance with the incoming current and to transfer the control signal to the holding voltage unit (10). The method according to claim 1,
The holding voltage unit (10) is designed to change the value of the holding voltage provided to its output (6) to match the control signal when receiving the control signal. 3. The method according to claim 1 or 2,
The control circuit 20 comprises a minimum current-selection circuit 5, which has one output and is adapted to measure the actual value of the current flowing through the electrical contact 8, A control circuit for two or more contactors designed to output a minimum actual value (I _min ) of current actual values through its output. The method of claim 3,
The minimum current-selection circuit 5 has one resistor 4 and one diode 3 per each electrical contact 8, one electrical contact 8 being connected to the cathode of one diode 3, And the anode of the diode (3) is connected to one terminal of the resistor (4). The method of claim 3,
The minimum current-selection circuit 5 comprises a resistor 4 and a precision rectifier 7 with two inputs and one output for each electrical connection 8, one electrical contact 8 each The other individual inputs of the individual precision rectifier 7 are connected to the respective inputs of the precision rectifier 7 while the outputs of all the precision rectifiers 7 are connected to the output of the individual precision rectifier 7, Is connected to one terminal of the control circuit (4). 6. The method of claim 5,
The precision rectifier 7 is implemented as a semi-coupled operational amplifier, with the semi-coupling branches of the operational amplifier each having one diode 3, the cathodes of the diodes being each connected to the output of a respective operational amplifier, Wherein the anode of the diode (3) is connected to the inverting input of a separate operational amplifier. 7. The method according to any one of claims 3 to 6,
The control circuit 20 comprises a first regulation circuit 1 whose input is connected to the output of the minimum current-selection circuit 5 whose output is connected to the output of the hold voltage unit 10 And the first adjustment circuit 1 is connected to the input 9 so that the current flowing into the input thereof is compared with the reference value and the holding voltage for the holding voltage unit 10 is adjusted And to transmit the control signal to the holding voltage unit (10). 8. The method of claim 7,
The reference value corresponds to the required holding current (I _Hmin ) at a minimum of the contactor to be controlled, for a control circuit for two or more contactors. 9. The method according to claim 7 or 8,
The first control signal is always used for two or more contactors, corresponding to the control signal for the holding voltage unit 10, which is always necessary to adjust the minimum required holding voltage at the output 6 of the holding voltage unit 10. [ Control circuit. 10. The method according to any one of claims 7 to 9,
The regulating circuit 20 comprises a second regulating circuit 2 which supplies the first control signal generated by the first regulating circuit 1 to the output 6 of the holding voltage unit 10 ) And designed to overlap an additional control signal with the first control signal in accordance with the comparison result. 11. The method of claim 10,
The average period T ₂ lying between the formation of two consecutive additional control signals by the second arbitration circuit 2 is determined by the first arbitration circuit 1 in such a way that each of the two consecutive first control signals (X) is less than the mean period (T ₁ ) lying between the _first and second electrodes and wherein X is greater than 0 and less than 1 (0 <X <1). - two or more control bobbins for controlling two or more contactors,
- two or more contactors connected to two or more control bobbins and comprising a holding voltage unit (10) designed to cause current flow through two or more control bobbins by a holding voltage generated at its output The method comprising:
This method
- providing a starting current (S1) flowing through two or more control bobbins by a holding voltage unit (10);
- providing a holding current (S2) flowing through two or more control bobbins by a holding voltage unit (10);
Comparing and / or comparing the holding currents S3 flowing through the two or more control bobbins with each other or selecting a minimum current among the holding currents flowing through the two or more control bobbins;
Comparing said minimum holding current with a reference current (S4);
(10) for controlling the holding voltage at the output of the holding voltage unit (10) according to the result of comparing the minimum holding current among the holding currents flowing through the two or more control bobbins to the reference current 1) generating a control signal (S5);
- comparing the first control signal (S6) with a holding voltage present at the output of the holding voltage unit (10); And
(10) for controlling the holding voltage at the output of the holding voltage unit (10) according to the comparison result between the first control signal and the holding voltage present at the output of the holding voltage unit (10) 2 &lt; / RTI &gt; control signal (S7). &Lt; Desc / Clms Page number 13 &gt;

Images