DE2848824A1 - POWER CONTROL ARRANGEMENT - Google Patents

Description

DIEHL GMBH & CO., Stephanstr. 49, 3500 Nuremberg

Arrangement for power control

The invention relates to an arrangement for power control of ohmic loads, in particular for electric cooking appliances a control circuit for individual simultaneous power control for several consumers and each with an actuating element for controlling the control circuit, the power being available to the respective consumer in quantized form stands.

Power controls of the above type are known.

DE-OS 26 05 533 discloses an electronic control device for electric stoves with digital input, whereby the supply of power to the consumer in pulses of different, depending on the selected performance level Length takes place. The pulse frequency of the power pulses is constant in the continued boiling range, in the so-called parboiling range, a maximum power boost is available to the electrical consumer Power supplied, whereby the boiling time depends on the selected power level with which at the end after boiling is to be continued.

Furthermore, electronic components are known in a highly integrated form, which in the above-mentioned type the performance of several able to control ohmic consumers.

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030020/0410

These blocks (ζ. Β. See data sheet for General Instrument Appliance timer Ay - 5 - 1250) allow the simultaneous control of several heating plates, still are Connections for an automatic boil-up and a function display are provided, and they are also used to set the time of cooking processes possible.

It is the object of the present invention to arrange the control elements for several heating plates in such a way and mechanically to couple with each other that the control and wiring of a common control circuit for all operating elements in a cost-saving, service-friendly and functionally reliable manner. Furthermore, the parboiling command should be over the rotatable actuating element of the respective heating plate and, above all, take place without any additional switching elements.

According to the invention, the object set is achieved by that all actuating elements and switching elements for at least two consumers are combined in a common housing are that the actuating elements continue to act on the first switching contacts via common mechanical control elements, through which the load circuits assigned to the actuating elements can be switched on and off, and that in addition Each actuating element is assigned two rows of mutually displaceable control contacts are provided by one of which is stationary and the other is in operative connection with the actuating element, and via these control contacts depending on the position of the actuating elements, several inputs of the control circuit at the same time, in groups or individually controllable.

A number of advantageous developments of the invention can be derived from the subclaims.

030020/0410

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For example, the actuating elements can be used for control the consumer with rotary coding switches in active connection; stand and the contact surfaces that interact electrically with the control elements on a first printed circuit board be upset.

Furthermore, a common control lever, each of which has a control cam arranged on the shafts of the actuating elements scans, can be used to actuate first and second switch contacts.

The SchMfkontakte are to switch on the parboiling process from the first printed circuit board, the contact surfaces can be lifted off arranged, the control circuit is supplied with a specific bit pattern, namely 0000.

To increase the functional reliability of the arrangement, each of the four codes is on the contact surfaces of the first circuit board can be scanned at several points at the same time.

The radial one-step coding was changed at one point so that several code positions change at the same time, d. H. the one-step coding is interrupted at this point.

The further claims contain some particularly advantageous mechanical and electromechanical details.

An embodiment of the invention is based on a few drawings described.

Fig. 1 shows a section through the arrangement according to the invention perpendicular to the -waves of the actuators along the section line I-I in Fig. 2. In

0020/0410

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Fig. 2 is a sectional view of the arrangement along the shafts of the actuators along the section line II-II shown in Fig. 1.

Fig. 3 discloses one way of arranging the contact surfaces on the first printed circuit board according to the invention.

The power control arrangement shown in FIGS. 1 and 2 essentially consists of a housing 2 common to several actuating elements 1, 1 ', a circuit board 3' on which Gray code contact surfaces 4, 4 ^{1 are} applied, and a second circuit board 5 to accommodate a control circuit 6 arranged by a resistance symbol, several switch shafts 7, 7 ', at one end of which an actuating element 1, 1 ^{1 is} arranged and at the other end a plate-like widening 8, 8 ^f each to accommodate a row of control contacts 9 , 9 ^{f is} molded. In the middle area of the shafts, their circumference is shaped as a control cam 10, 10 *, which mechanically engage with a control lever 11 common to both shafts 7, 7 '. To scan the circumference of the control cams 10, 10 ', a scanning cam 12, 12' is formed on each end of the control lever 11. The control lever 11 is supported by an elongated hole 13 on a molded-in housing 2 pillar 14 so that the control lever perpendicular to the shafts 7, 7 ^f of the actuators 1, 1 ¹ is both slidable and tiltable. The control lever 11 is also held by a leaf spring 15, which is clamped between two further pillars 16, 16 'mounted in the housing 1 and a groove 11' made in the control lever, and the scanning cams 12, 12 * arranged on the control lever 11 are attached to them respectively assigned control cams 10, 10 'pressed. The two scanning cams 12, 12 'are the first switching contacts

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17, 17 ', which consist of a contact spring 17a common to both contacts 17, 17' and two further contact springs 17b and 17c which form the mating contacts. The latter contact springs rest on housing projections 18, 18 'when the contacts are not closed. The shafts 7, 7 'are slidably mounted in a bore in the front wall of the housing 2 and by means of a pin 19, 19' in a bore in the first printed circuit board 3 along their shaft axis. As a result, the control contacts 9, 9 ′ ^{can be lifted off the contact surfaces 4, 4 1} , which are applied to the first printed circuit board 3. The control contacts 9, 9 'are in the not lifted state by means of helical springs 20, 20', which are arranged between the plate-like widenings 8, 8 'of the shafts 7, 7' and the front wall of the housing 2, against the contact surfaces 4, 4 'of the first printed circuit board 3 pressed. A plurality of diodes 21, which are electrically connected to the control circuit 6, are also arranged on the rear side of the first printed circuit board 3. On the second printed circuit board 5, in addition to the control circuit 6, a switching relay 22, 22 'is provided for each of the two load circuits, the power of which can be controlled with the device. The electrical connection to the consumers to be controlled and to the power supply is established via a number of flat plugs 23, which are also arranged on the rear of the second printed circuit board 5. These tabs 23 can be electrically connected to either individual plugs or a connector strip.

Several spring tongues 24 are injection molded onto the upper side of the switching arrangement and cover several mounting recesses 25. Due to the arrangement of the parts 24 and 25, a plurality of switch-on indicator lights 26 can be attached to the top of the arrangement will.

On the control cams 10, 10 'a nose 27, 27' are each formed, which with the cams 12, 12 "of the contact lever 11 in

030020/0410

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Intervention come. These two lugs 27, 27 'are intended to prevent the contact springs 9, 9 ^{1 from} remaining in an area of the contact surfaces 4, 4' in which the coding for driving the control circuit 6 changes in the manner described later.

Further switching tongues 28 are arranged at one end of the leaf spring 15, the mating contacts 29 assigned to them interact electrically. By means of this contact arrangement 28, 29, a further two shafts 7, 7 * are jointly assigned Switching function can be carried out.

To clarify the function of the arrangement according to the invention, it is assumed that one of the two shafts 7, 7 ¹ from its rest position in which the scanning cam 12 or 12 assigned to the shaft 7, 7 'engages in the notch of the respective control cam 10, 10', be unscrewed.

The control lever 11 slides with one of its scanning cams 12, 12 · on the respective control cam 10, 10 'and becomes lifted up on the side of the actuated shaft 7 or 7 ', with the elongated hole 13 being molded along the housing 2 Pillar 14 moves. The control lever performs a rotary movement around the second of the scanning cams 12, 12, which rests in the notch of the non-actuated control cams 10, 10 '. The raised scanning cam 12 or 12 presses against the contact spring 17a, also lifts it and presses it against the contact spring 17b or 17c located opposite it

The upper one of the contact springs 17b or 17c lifts when closing of the contact from the housing projection 18 or 18 ·, whereby a secure contact is guaranteed.

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030020/0410

If both shafts 7, 7 ^{f are} actuated, both sides of the control element are lifted up and, accordingly, both contacts 17, 17 'are closed. Through the contacts 17 and 17 ', on the one hand, the control circuit 6 common to several consumers is connected and, on the other hand, the load circuits are also switched on and off. The control circuit 6 clocks the two relays 22, 22 'assigned to the respective consumer circuits depending on the setting of the desired power level on the actuating elements 1. This movement of the control lever 1 when one or both actuating elements 1, 1' is rotated, the leaf spring 15 between the two The posts 16, 16 'molded on the housing 2 are bent in such a way that the contact springs 28 arranged at one end of the leaf spring 15 touch the mating contacts 29 assigned to them. The longer of the two contact springs 28, 28 'is slightly wider than the shorter one in order to ensure the same contact pressure at both contact points. This contact arrangement 28, 29 is assigned the flow of a common underfuition of the device, for example the flow of current to one of the function control lights 26.

The control contacts 9, 9 'are firmly connected to the plate-like widenings 8, 8' of the shafts 7, 7 'and, when the shafts 7, 7' rotate on the printed circuit board 3 opposite them, scan a radial one-step code on a number of contact surfaces 4 whose one-step nature is interrupted at a transition point. If the control contacts 9, 9 'are lifted off the contact surfaces 4, 4 ^{1 of} the circuit board 3 against the force of the springs 20, 20 ^{' by pulling on the shafts 7, 7 1, the control circuit 6 recognizes the coding - 0000 - and thus the} Command to keep one of the relays 22, 22 'closed for a certain period of time. This period of time is determined by the rotational position of the respective shaft 7, 7 'after it has been released, and is therefore logically linked to the control system. Preferably the described

030020 / OA10

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Process used to set a hotplate as quickly as possible to the position of the one assigned to it after it has been switched on Actuating element 1, 1 'to heat up the corresponding temperature.

In Figure 3 one of the possibilities is shown, the contact surfaces 4, which are scanned by the control contacts 9 and 9 'when the actuating elements 1 or 1 · are rotated, on the to arrange first circuit board 3 according to the invention.

On the one hand, to increase the functional reliability of the device, scanning errors of the radial one-step code are avoided by the fact that each of the four code positions can be scanned by the control contacts 9, 9 ^{1 at several of the circular, segmented contact surfaces 4, 4 1.}

On the contact surface arrangements shown in Figure 3, the contact points 30, 30 'of the control contacts 9, 9 ¹ on the contact surfaces 4, 4 ^! drawn. In the case shown on the left-hand side of FIG. 3, only the inputs A and C of the control circuit 6 are energized, the tapping on the contact surfaces 4 takes place with 2 contact springs for each input.

On the other hand, the arrangement of the contact surfaces 4, 4 'was designed in such a way that several positions of the otherwise one-step code change at a transition point, which is each indicated by an arrow in the figure. Remaining of the control contacts 9, 9 ¹ on this undefined code position for the control circuit is avoided by the arrangement of the lugs 27, 27 'and their mechanical interaction with the scanning cams 12, 12'.

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On the right of the contact surface arrangements shown in Figure 3, the contact points ^{3n of} the control contacts 9 ¹ on the contact surfaces 4 'designed as circular segments are shown, with all inputs A', B ', C ₁ D ^{1 of} the control circuit 6 being energized in the position shown.

Due to the inventive arrangement of the contact surfaces 4, 4 ^f on the first printed circuit board 3, the multi-stage power control could be retained while avoiding an additional switch for the parboiling process.

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Claims (1)

Patent claims: (1., Arrangement for power control ohmic consumers, especially for electrical cooking appliances, with a control circuit for individual simultaneous power control for several consumers and each with an actuating element for controlling the control circuit, the power to the respective consumer in quantized form is available, characterized in that all actuating elements (1, 1 ') and switching elements (17, 17') for at least two consumers are combined in a common housing (2), that furthermore the actuating elements via common mechanical control elements (10, 10 ', 11, 12, 12 ·) act on first switching contacts (17 _t 17'), through which the load circuits assigned to the actuating elements (1, 1 ') can be switched on and off and, in addition, two are assigned to ^{each actuating element (1, 1 1)} Rows of mutually displaceable control contacts (4, 4 ¹ , 9, 9 ¹ ) are provided, one of which is stationary and the other with d en actuating elements (1, 1 ·) are in operative connection, with several inputs of the control circuit (6) simultaneously, in groups, via these control contacts (4, 4 ', 9, 9') depending on the position of the actuating elements (1, 1 ') or individually controllable. 2. Arrangement for power control according to claim 1, characterized in that for controlling the plurality of consumers assigned control circuit (6) for each consumer 030020/0410 Rotary coding switch is arranged in the housing (2) which has a rotary shaft (7, 7 '), at one end of which the respective actuating element (1, 1') is attached and at the other end of which the control contacts (9, 9 ') designed as sliding contacts are attached are, which interact with them opposite on a first printed circuit board (3) applied contact surfaces (4, 4 ¹ ), and that on each of the rotary shafts (7, 7 ') a control cam (10, 10') is further arranged, which with the mechanical control elements (11, 12, 12 ') is in engagement. Arrangement for power control according to Claims 1 and / or 2, characterized in that the mechanical control elements (11, 12, 12 ') for scanning the control cams (10, 10') from a control lever common to both shafts (11) with one scanning cam (12, 12 ') for each control cam exist that the first switching contacts (17, 17 ') are still arranged at the ends of the control lever (11), which can be actuated by the scanning cams (12, 12 ') to connect the respective load circuit, and that in addition a spring (15) is provided which presses the scanning cams (12, 12 ') against the control cams (10, 10'), wherein on this spring second switching contacts (28, 29) for switching on and off a common further function of the Arrangement are appropriate. Arrangement for power control according to Claim 1, characterized in that the rotatable shafts (7, 7 ¹ ) of the rotary coding switches by means of a pin (19, 19 ') each in a first printed circuit board (3) opposite the sliding contacts (9, 9') on the one hand, in the front wall of the housing (2), on the other hand, are mounted that a further helical spring (20, 20 '), the widening (8, 8 ¹ ) is introduced, the sliding contacts (9, 9 ') against the contact surfaces (4, 4') of the first conductor 030020/0410 _ 3 - Plate (3) presses that by this type of storage of the shafts (7, 7 ') both shafts (7, 7') are mounted so far along their shaft axes that the sliding contacts (9, 9 ') against the force of Springs (20, 20) can be lifted off the contact surfaces (4, 4 ¹ ) of the first circuit board (3), that a second circuit board (5) is also provided to accommodate almost all electronic components and that the arrangement of both circuit boards (3 , 5) the mechanical components are spatially completely separated from the electronic components. 5. An arrangement for power control ohmic loads according to claim 4, characterized in that the arrangement of the contact surfaces (4, 4 ^f ) on the first circuit board (3) results in a one-step, four-digit binary code (Gray code) through which the Inputs of the control circuit (6) can be controlled. 6. An arrangement for power control ohmic loads according to claims 4 and 5, characterized in that upon rotation of one of the two actuating elements (1, 1 ¹ ) and brief lifting of the sliding contacts (9, 9 ') from the contact surfaces (4, 4 ¹ ) the directly opposite printed circuit board (3) the control circuit (6) receives the bit pattern 0000, the latter being the consumer assigned to the respective actuating element (1, 1, ¹ ) for one of the rotary position of the actuating element (1, 1 ') controls the dependent period with the maximum available power. 7. An arrangement for power control ohmic loads according to claim 5 or 6, characterized in that each of the four code digits A, B, C and D of the sliding contacts (9, 9 ¹ ) - 4 030Ö2Ö / CU1Q on several contact surfaces (4, 4 ') to avoid scanning errors of the one-step Gray code can be scanned at the same time. 8. An arrangement for power control ohmic loads according to claim 5, characterized in that the arrangement of the contact surfaces (4, 4 ') on the first printed circuit board (3) radially around the axes of rotation (7, 7 ¹ ) is chosen so that at a Rotation of the sliding contacts (9, 9 ') by 360 ° around the shafts (7 »7 ¹ ) at each transition point, simultaneously changing several of the four Gray code digits and the one-step nature of the binary code is interrupted and that on the shafts ( 7, 7 ¹ ) each has a cam (27, 27 ') which comes into mechanical engagement with the scanning cam (12, 12') of the control lever (11) assigned to ^{the respective shaft (7, 7 1) and the remaining} Prevents sliding contacts (9, 9 ') on the transition point. 9. An arrangement for power control ohmic consumer according to claim 3 »characterized in that a leaf spring (15) is provided which is attached under bias on the control lever (11) and on the housing (2) of the arrangement that the scanning cams (12, 12 ') of the control lever (11) are pressed against the control cams (10, 10') and that the leaf spring (15 ^{) is so tensioned when one of the two actuating elements (1, 1 f} ) is rotated that the second switching contact located at its end (28, 29) the operating control lamp (26) can be energized. 10. Arrangement for power control ohmic consumers Claim 4, characterized in that on the second printed circuit board (5) for each of the two load circuits a switching relay (22, 22 ") is attached to energize the consumer assigned to it. 030020/0410 " ⁵ ~ 11. An arrangement for power control ohmic loads according to claim 1, characterized in that on the top of the controller housing (2) spring tongues (24) made of plastic are integrally formed and so are the ends of these spring tongues Cover molded mounting recesses (25). 12. An arrangement for power control ohmic loads according to claim 4, characterized in that on the back the other printed circuit board (5) several flat tabs (23) are attached, which can be connected to a connector strip or individual plugs. 03Ö02Ö / Q4KB