DE2326608C2 - Easily adjustable AC voltage adaptor - has rotary switch for selective tapping of transformer to give standard AC output - Google Patents

Abstract

The switch includes a terminal board with a central fixed terminal, a plurality of fixed terminals arranged in plural coaxial circles around the central terminal and a rotary insulating member which has a pair of spring mounted short circuit contacts arranged parallel to each other, the first short circuit contact connecting with the central terminal and with one of a plurality of solid terminals intersecting one of the plural coaxial circles and the second short circuit element being selectively connected to two or more of the fixed terminals on another of the coaxial circles.

Description

characterized,

- that the terminal board (1) has a circular recess (\ A) in which the fixed contacts (T \, T2 ...) are arranged and in which the rotary knob (2) is rotatably inserted,

- That the rotary knob (2) in the recess (\ A) of the terminal board _Λ ^; 1) is held by a cover (3) with at least two retainer attachments (3h) , which are bent over by a little. -Ns a part (IC, \ D) of the clipboard, and

- That the cover (3) has a number of slots (3d, 3e, 3f, 3g) , while a spring-ball locking device (BO, SP) is inserted into a hole (2c) of the rotary knob (2), this spring Ball locking device can be brought into locking engagement with a respective slot in the cover in such a way that the rotary knob can be locked in its position corresponding to a selected voltage.

2. Voltage selector according to claim 1, characterized in that two short-circuiting elements (S _it S2) are provided in the rotary knob (2) and the fixed contacts (Tu T2 ...) on the terminal board (1) on two coaxial circles (Q, C2 ) are arranged and that one short-circuiting element (St) is in engagement with a fixed contact (Tt) on one (Q) of the coaxial circles and the other short-circuiting element (St) at the same time with two of the fixed contacts (ζ. Β. Γ4, 7s) is connected to the other coaxial circle (Ci) .

3. Voltage selector according to claim 2, characterized in that a plurality of depressions (2a, 2b) for receiving the short-circuiting elements (SuSj) are provided in the rotary knob (2).

4. Voltage selector according to claim I, characterized in that the rotary knob (2) has a slot (2d) on its upper side for manual rotation.

The invention relates to a voltage selector according to the preamble of claim 1. Such a voltage selector is known from US-PS 33 89 302.

The voltage value of the electrical power supply in individual countries is different. For example, the voltage in some European countries is 220 V, but in other countries IiO or 240 V. In addition, the voltage value can even be different in the same country.

When traveling through different countries with an electrical device, e.g. B. a tape recorder, a Radio or the like, the electrical device must be set accordingly to match the in the respective Voltage available in the country.

For this purpose, voltage selectors have already been proposed which have a specific AC voltage value at their output even when generating an alternating voltage with a different value than a predetermined one is supplied. One known embodiment consists of a rectangular connector terminal board with plug contacts that are arranged parallel to one another on an insulating base plate, a socket base plate attached to the housing and a transformer connected to the socket outlet. With these fun voters, depending on the In the country in which the electricity is to be used, the plug contact plate has been manually removed from the socket plate and then plugged into a matching socket plate to respond to the accessible voltage source to generate a corresponding operating voltage. Accordingly, will when the voltage changes, the plug contact plate is detached from the socket plate, which increases the risk consists in that the plug contact plate is lost or falls out of the socket plate when the former is not pressed in firmly. Furthermore, it is quite cumbersome to remove the plug from the socket and then insert it into the socket. In order to also allow the plug contact plate to protrude from the outside To avoid the housing, the plug contact plate is attached to the housing by a shoulder is provided on the housing around the plug-in contact plate in order to facilitate the insertion of the fingers, whereby the fastening area becomes relatively large.

In the already mentioned known embodiment (US-PS 32 89 302) is the actual part of the selector essentially attached to a housing wall.

This actual voltage selector consists of a large number of essentially screwed together or parts riveted together, which are mainly held together by an axis of rotation provided with screw nuts and be worn. This axis of rotation is attached to the aforementioned housing wall with the aid of a socket rotatably held so that its one end protrudes from the housing and outside a kind of turntable or rotary knob, while the terminal board made of insulating material inside the housing are arranged with the fixed contacts as well as three short-circuit members connected non-rotatably to the axis. These short-circuiting members are each formed in the shape of a circular arc or sickle and are firmly insulated Retaining elements riveted. This well-known

(Γ> leadership is therefore relatively complicated Construction from a large number of parts, apart from the fact that they are only for two different voltage values (120 and 240 V) as well as in connection with the

application of fuses or the like described is

A type of voltage selector can also be found in GB-PS 1 83 480; however, this is well known Embodiment constructed even more complicated than the one explained above, in this case also only one short-circuiting element is provided in the form of a bridge element

In addition, DE-OS 21 40 034 only shows an electrical circuit arrangement, in a voltage change within the circuit can be achieved with the help of a connection changer, However, there are no constructive indications in the direction of a voltage selector.

The invention is therefore based on the object of providing a voltage selector in the preamble of claim 1 to create the required type, which is achieved with a reliable switching function for the preselected voltage is characterized by its particularly simple structure with parts that are held together securely and cannot be lost.

This is achieved according to the invention by the features listed in the characterizing part of claim 1

In this embodiment according to the invention, the actual selector part consists of a few elements, namely the terminal board (with the permanently attached contacts), the rotary knob, the between Knob and clipboard arranged short-circuiting elements and the cover together. the Shaping of the elements mentioned then ensures an extremely compact arrangement, which is safer Adjustment function of the desired tension only held together by a few mounting lugs on the cover can be bent over on the clipboard without rivets, Screws or connecting means that are similarly complicated to manufacture and to be fixed would be required.

Sensible refinements of the invention are the subject matter of the subclaims.

Further details of the invention emerge from the following description of exemplary embodiments based on the drawing. It shows

1 shows a schematic circuit of the transformer with contacts that are connected to contacts of the selector switch (view from the rear of the Switch);

F i g. Fig. 2 is a plan view of the selector switch;

Fig. 3 is a side view; the selector switch shown in Fig. 2;

F i g. Figure 4 is a plan view of the terminal board which forms part of the selector switch;

Fig. 5 shows a cross section along the line IV-IV in F ig. 4;

Fi g. 6 is a plan view of the rotary knob, the one Forms part of the selector switch;

F i g. 7 shows a cross section along the line VII-VII in F ig. 6;

Figs. 8A, 8B and 8C are perspective views of Figs Shorting members and a ball and a spring provided in the rotary knob;

Fi g. 9 to 12 circuits of the transformer in different selected positions; and

Fig. 13 is a circuit diagram of another embodiment of the transformer.

A voltage selector according to the invention consists of a transformer 77? and a selector switch SW. the one with the transformer 77? connected is.

The transformer TR is described below with reference to FIG. 1 described, which shows the connecting state of the transformer TR and the selector switch SW

The transformer TR has a primary winding Li and a secondary winding L ₂ . In this case, the primary winding Li is divided into a first winding L \ \ and a second winding L \ ₂ . The first winding Ln has a reference contact point or tap point fi with zero volts at one end and a contact point or tap point t ₃ of 130 volts at its other end and a contact point or tap point f ₂ of 20 volts at the measuring point in between, while the second Winding Li 2 has a reference contact point or tap point u of zero volts at one end and a contact point or tap point ie of 130 volts at its other end and a contact point or tap point fs of UO volts at the measuring point in between

The selector switch SW is described below in connection with FIGS. 1 to 8. The selector switch SW consists of a terminal board 1 having a plurality of fixed contacts and a push button 2 with short-circuiting parts for short-circuiting any of the fixed contact points. F i g. 2 shows a plan view of the selector switch SW, while FIG. 3 shows its side view.

The terminal board 1 of the selector switch SW is formed of an insulator so that it is substantially disk-shaped and has a circular recess \ A on its central part. A plurality of fixed contact points are provided on the bottom of the circular recess \ A in an arrangement which will be further described.

In the figures, Tf denotes a central fixed contact which is arranged in the circular recess \ A , C% and C ₂ denote inner and outer coaxial circles which have the same center O as the circular recess 1/4, and T ₂ is a fixed contact on the inner circle Q. A fixed contact Γι is provided so that its one end Tu lies on the inner circle G, while its other end Tu lies on the outer circle C _2. Fixed contact points Ti, Ts, and Ti are arranged on the outer circle Cj in this order from the end 7 "κ, of the fixed conact T \ in a counterclockwise direction at an angular distance of 90 ° from one another. The fixed contact T ₂ on the inner circle C. \ is attached at a location corresponding to that on the outer circle C ₂ which is angularly spaced 45 ° from the contact Ta in the counterclockwise direction, and the end T \ _{3 of} the contact 71 is on the inner circle C \ at the location attached, which is rotated against the position of the contact T ₂ by 90 ° counterclockwise.

Outer leads T \ to T% of the fixed contacts 7 "i to Tf ₁ protrude on the rear surface Iß of the terminal board 1, as shown in Figures 3 and 5. These fixed contacts T \ to T ₆ or the outer ones Leads T 1 to T% are connected to the contacts fi to te of the primary coil Li of the transformer TR in the following ratio to one another, as shown in FIG.

Fixed contacts
(external feeds)

Contacts of
Transformer 77?

T ₇ (T ₁ ) T ₁ (T ₃ ) T ₄ (T ₄ ) T ₃ (T ₅ )

U H H

Furthermore, the fixed contacts T ₄ (external supply T ₄ ) and the fixed contacts T ₆ (external supply T%) are connected to an electrical high-voltage input contact or a contact plug 13.

The rotary knob 2 of the selector switch SW consists of a disk-shaped base part 2A and a round stamp-like approach IB, as shown in FIG. 6 is shown. These parts 2A and 2B are integrally formed from an insulator such as a phenolic resin.

A low short-circuiting element Si (FIG. 8B), which can short-circuit the middle fixed contact Te with one of the contacts Ti and 7 * 2, and a high short-circuiting element S ₇ (FIG. 8A), which has two of the contact points Ti, 7 " ), T ₄ and Ts arranged at angles of about 90 ° therebetween are inserted in a shallow recess 2a and a deep recess Ib in the element 2A of the knob 2. In this case, the shorting members are Si and S ₇ arranged in such a way that when the central fixed contact point Tf is short-circuited with the fixed contact Ti, the other short-circuiting element S2 of the fixed contact T ₄ short-circuits with the fixed contact T5 in the manner shown in FIG.

The short-circuiting members Si and S ₂ are formed from a printed circuit board such as a phosphor bronze plate, and are bent into a substantially V-shape as shown in FIGS. 8B and 8A. In the figures, Sa and Sb denote contact parts of the members Si and S2 for fixed contacts Ti to Τβ- The knob 2 has a bore or hole 2c into which a metal ball Bo and a spring Sp shown in Fig. 8C are inserted in part 2A and a longer elongated groove or slot 2d in part 2B. The elongated groove 2d can be selected with regard to its size so that it is sufficient, for example, to engage with a coin to turn the rotary knob 2. The rotary knob 2 also has an arrow 2e on its upper surface of the part 2B for indicating the tension (not shown) corresponding to the rotary position of the rotary knob 2, as shown in FIGS. 6 and 7 is shown.

The rotary knob 2 is rotatably connected to the terminal board 1 by a metal cover 3 which has an opening 3a in its center and four slots 3d, 3e, 3 / ″ and 3g around the opening 3a at an angular distance of 90 ° from one another slots 3d, 3e, 3 / and 3g can with the metal ball Bo reach and engage serve to retain the knob 2 in a predetermined position. the cover 3 further has handles (tangs 3h and bores 36 and 3c the bores la and liides clipboard 1 correspond.

The selector switch SW described above is constructed in the following manner:

The short-circuiting members Si and S2 are first inserted into the grooves or depressions 2a and 2b of the rotary knob 2. Then, the member 2A of the knob 2 is inserted into the recess A of the terminal board 1, and the spring Sp and the metal ball BO are inserted into the hole 2c of the knob 2. Thereafter, the cover 3 is attached to the terminal board 1 from above in such a way that the opening 3a of the former coincides with the protruding part 2ß of the rotary knob 2711 and therefore the cover 3 contacts the terminal board I. Thereafter, the handles 3h of the lid 3 are bent so that they come with the engagement parts IC and ID of the terminal board 1 into engagement. Then the corresponding external leads T ₁ to T't of the terminal board 1 are connected to the corresponding tapping points or contacts ίι to ti of the transformer TR in the manner described above.

The selector switch SW is therefore assembled without screws or the like. It is of course attached to an electronic device or inserted into it with the aid of screws through the openings 36, 36 of the cover 3 and the bores 2b and 2c of the terminal board 1.

The operation of the voltage selector is described below.

When the rotary knob 2 is rotated relative to the terminal board 1 in such a position that the short-circuiting member Si short-circuits the fixed contacts Ti and T _h with one another, while the other short-circuiting member S2 short-circuits the fixed contacts T ₄ and T- with one another, as shown in F i g. 4 is shown, then the contacts / j and / 5 and also the contacts t ₂ and f _{4 of} the transformer TR are each short-circuited. Accordingly, the connection between the contacts of the transformer TP and the electrical contact plug 13 takes place in the manner as shown in FIG. 9 is shown, in which the first winding Z-ii of the primary winding L \ between the contacts t ₂ and f3 and the second winding Z.12 of the primary winding L \ between the contacts U and is parallel to the contact plug 13 are connected. As a result of this, the secondary coil L _{7 of} the transformer TR is induced to have a predetermined output voltage when a voltage of 110 volts is supplied to the contact plug 13.

When the rotary knob 2 is rotated relative to the terminal board 1 in such a position that the short-circuiting member Si is in contact at one end with the fixed contact Τβ, but is not connected to any contact at its other end. and the other short-circuiting element S2 short-circuits the fixed contacts Tj and T% , then the contacts t ₇ and / 5 of the transformer TR are short-circuited. Accordingly, the connection between the contacts of the transformer TR and the contact plug 13 is of the type as shown in FIG. 10 is shown, in which the second winding L. _{2 of} the primary coil L \ between the contacts r ₄ and 15 and the first winding Lw of the primary coil L \ between the contacts t ₇ and f3 are connected in series to the contact plug 13, so that when a voltage of 220 volts is applied to the contact plug 13, the predetermined voltage is induced as the output signal at the secondary coil L _{2 of} the transformer TR.

When the rotary knob 2 is rotated relative to the terminal board 1 in such a position that the short-circuiting member Si is in contact at its end with the fixed contact Τβ, but does not touch any contact at its other end, and the other short-circuiting member S2 the fixed contacts Tj and Ti short-circuits, then the contacts ίι and t _{7 of} the transformer TR are short-circuited. As a result of this, a connection is established between the contacts of the transformer TA and the contact plug 13, as shown in FIG. 1, in which the second winding L \ _{7 of} the primary

coil L \ between the contacts u and t $ and the first winding Lw of the primary coil L \ between the contacts t \ and fi connected in series to the contact plug 13, so that when a voltage of 240 volts is supplied to the contact plug 13 a predetermined output voltage at the secondary coil L _{2 of} the transformer !. .'7? is produced.

If the rotary knob 2 is rotated relative to the terminal board 1 in such a position that the short-circuiting element Si short-circuits the fixed contacts T ₂ and T _b and the other short-circuit element S ₂ short-circuits the fixed contacts Tj and Ti , then the contacts f) and r _{b of} the transformer 77? short-circuited, and also its contacts t \ and U short-circuited. Accordingly, a connection takes place between the contacts of the transformer TR in relation to the contact plug 13, as shown in FIG. 12 is shown, in which the second winding L \ _{2 of} the primary coil L \ between the contacts t * and ( _b and the first winding Lw of the primary coil L, between the contacts fi and f3 are connected in parallel to the two contacts of the contact plug 13. If, therefore, a voltage of 130 volts is applied to the contact plug 13, the predetermined voltage is induced on the secondary coil L _{2 of} the transformer TR.

As can be seen from the above description, according to the invention, the rotary knob 2 is rotated relative to the terminal board 1 in positions corresponding to an input voltage of 110, 130, 220 and 240 volts in order to generate a certain constant output voltage at the secondary coil L _{2 of} the transformer 77? to obtain.

The above description has been made for the case that the primary coil of the transformer is in two separate windings with a plurality of contacts or Ab crifisDür.kSer. lower part ¹ ' ^{c |} »Ί" Hip FrfinHuni? Iqt is not restricted to the above exemplary embodiment. It is also possible that the primary coil of the transformer can be composed of three or more windings.

Furthermore, it is possible that, as shown in FIG. 13, the primary coil L '\ of the transformer TR' consists of only one winding and the secondary coil L'2 consists of two separate windings L'u and L'22 with a plurality of Contacts or tapping points is formed. In this case, the fixed contacts of the selector switch are each connected to the contacts or tapping points of the secondary coil L'2.

It is also possible that the fixed contacts of the terminal board are arranged on more than three coaxial circles will. In this case, the number of the short-circuiting members must be increased.

With the voltage selector as described above, the predetermined constant output voltage can always be obtained with a simple structure for different input voltages, and it exists no risk of incorrect operation occurring.

For this purpose 3 sheets of drawings
60

Claims (1)

Patent claims: 1. Voltage selector, containing - A transformer with a primary coil and a secondary coil, one of which is a coil has several separate windings with contacts, - a terminal board with a number of fixed contacts arranged on several coaxial circles are, - A rotary knob, which is assigned to the clipboard and several short-circuiting members for has optional short-circuiting of several of the fixed contacts, as well as - A connecting means for connecting a predetermined transformer contact with a predetermined fixed terminal board contact, creating a predetermined constant output voltage can be set for at least one other input voltage by turning the rotary knob,