DE20118643U1 - Power Device - Google Patents

Description

-1 - Description

Power supply unit

The invention relates to a power supply unit or power pack with a

preferably single-phase primary voltage, for example 230 V, 50 Hz and with at least a secondary voltage converted via a transformer to an output terminal, where at least one output terminal is protected by a fuse.
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A fuse holder for such a power supply is known from the document US 5,982,267.

The increasing networking and integration of electrical equipment makes it necessary to adapt power supply devices or power supplies to these requirements.

The invention is therefore based on the object of specifying a power supply device in which the supply state can be easily called up or determined.

Starting from a power supply device of the type mentioned at the outset, the object is achieved according to the invention by the characterizing features of the independent claim, while advantageous further developments of the invention can be found in the dependent claims.

The essence of the invention is that the output connection is assigned a display device which emits an information signal about the supply status of the device or about the size of the secondary voltage. With the invention, all network sizes or network types (mentioned as possible types of information signal) required to supply power to a control arrangement, for example, can be monitored.

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The presence of the secondary voltage should be recognizable, with the options of optical visibility and/or electrical signaling being set up depending on the application.

The electrical message can be used for digital or analogue remote transmission with the alternatives of active transmission or passive query (monitoring). The message can also be used for data processing and/or signalling.

Further details are as follows:

Each output terminal is assigned a fuse and an indicator.

The information signal is output via an optical display.

The optical display can consist of known light elements. For example, two LEDs can be used that differ in their signal color; a green LED is used to indicate the full secondary voltage and a red LED for the voltage failure or the fuse failure. However, individual LEDs can also be used that consist of a light element that emits green light ("voltage present"), red light ("fuse blown") or no light ("voltage missing") depending on the control.

The information signal in each of the secondary circuits can also be output as an electrical signal (analog, but preferably digital). The signal can be a high/low signal. Depending on the arrangement, a connection can also be made via a relay, which opens or closes a loop contact, so that the state of a potential-free contact provides information about the output state of the associated secondary circuit.

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The electrical signal can also be transmitted to a reporting device and/or processing device or interrogated by such a device.

Depending on the application, the power supply unit provides several (in the example three) secondary voltages, with at least one being output as a direct voltage.

Further advantages of the power supply unit arise from features relating to its structural design.

It should be emphasized that the transformer is arranged upright on a mounting plate or base plate and above the transformer there is a housing frame that supports all the structural components of the power supply device. These components are essentially the rectifiers, fuses, capacitors, display devices, connection units and terminals. The advantage is that this allows the smallest possible footprint (and thus saves space), less wiring effort and increased failure protection.

The arrangement of the components can also be designed as a unit that can be plugged onto the housing frame. In this case, a plug-in receptacle can be attached to the head of the housing frame, which mechanically accommodates a plug-in unit and also provides the electrical contacts.

Further details and advantages of the invention emerge from the following embodiment explained with reference to figures. They show

Figure 1: the circuit structure and
Figure 2: a view of the power supply.

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The circuit structure according to Fig. 1 shows a transformer 12 with a primary winding 14 and associated connection contacts 13 (also with +/-5% taps) for a mains voltage 60 of 230 volts, 50 Hz. Three secondary windings 16, 16', 16" are galvanically isolated, the first of which supplies a reduced alternating voltage 62 of 24 V to the associated output terminal 30 and the other secondary windings 16', 16" each provide direct voltages of 10 V (1 A) and 24 V (3A) to the associated output terminals 30', 30" via a rectifier 20', 20". Each secondary branch is protected by a fuse 32, 32', 32".

The optical signal or display of the output voltage or of a defective fuse (32) in each secondary branch is provided by LEDs (34,35; 34',35'; 34",35") which, as Figure 1 clearly shows, can be controlled via diodes 40 and light up depending on the state of the output voltage.

To emit an electrical signal 62, 62', 62", which is also set up in each of the secondary circuits, there is a connection via a relay 41, 41', 42". When the secondary voltage is lost, the relay opens or activates a loop contact 42, 41', 42" in a potential-free manner. The resistance of the loop contact thus provides information about the initial state of the associated secondary circuit. This means that the initial state can be queried from outside via a device connected to the signal contact terminals 36, 36', 36".

Figure 2 shows the power supply unit (power pack) with connection terminals 13 for a single-phase primary voltage 60. The transformer 12 comprises primary and secondary windings 14, 16 and supplies three secondary voltages 62 to the connection terminals 30, 30', 30". The connection terminals 30, 30', 30" are arranged in groups, with the signaling contact terminals 36 for outputting the respective information signals 64 about the presence of the secondary voltage being located closely adjacent.

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The transformer 12 is arranged upright on a mounting plate 18. Above the transformer 12 there is a housing frame 24 which carries all the components (22, 30, 32, 34, 36) of the power supply unit. These components are essentially the rectifiers 20 - not visible in the figure - the fuses 32, 32', 32", the display devices 34, 34', 34" - here visible as three LEDs, the connection terminals 13, the already mentioned output terminals 30, 36 and an earth connection terminal 44. The connection elements are advantageously only present on one side of the power supply unit. The electrical elements are preferably applied to a printed circuit board 22, the edge of which is still visible in Fig. 2. Three LEDs are used as display devices 34, 34', 34. As described, they can be used to indicate the presence of secondary voltage, the absence of voltage, or the failure of the fuse. Several types of LED color can also be present next to each other, whereby one of the two types of color is controlled and lights up depending on the initial state. In parallel with the control of the display devices 34, 34', 34, a voltage is provided at the signaling contact terminals 36, which can be used for transmission to signaling and/or processing devices (not shown).

In the arrangement shown, motor vehicle fuses are used for the fuses (32).

Not shown in Fig. 2 is the pluggability on the housing frame.

Claims (11)

1. Power supply device (power pack) operated with a preferably single-phase primary voltage ( 60 ) and with a secondary voltage ( 62 ) converted via at least one transformer ( 12 ) to an output terminal ( 30 ), in which at least one output terminal ( 30 ) is protected by a fuse ( 32 ), characterized in that the output terminal ( 30 ) is assigned a display device ( 34 , 35 ) which emits an information signal ( 64 ) about the size of the secondary voltage ( 62 ). 2. Power supply device according to claim 1, characterized in that each output terminal ( 30 ) is associated with a fuse ( 32 ) and a display device ( 34 , 35 , 36 ), 3. Power supply device according to claim 1 or 2, characterized in that the information signal ( 64 ) is output via an optical display ( 34 , 35 ). 4. Power supply device according to claim 3, characterized in that an optical display ( 34 , 35 ) is provided by a single LED ( 34 , 34 ', 34 ") or by two LEDs. 5. Power supply device according to one of the preceding claims, characterized in that the information signal ( 64 ) is output as an electrical signal. 6. Power supply device according to claim 5, characterized in that the information signal ( 64 ) can be output as a resistance of a potential-free contact ( 42 ). 7. Power supply device according to claim 5 or 6, characterized in that the electrical signal can be transmitted to a signaling and/or processing device or can be retrieved by such a device. 8. Power supply device according to one of the preceding claims, characterized in that three secondary voltages ( 62 , 62 ', 62 ") are provided. 9. Power supply device according to the preceding claim, characterized in that at least one of the secondary voltages ( 62 ) is provided as a direct voltage. 10. Power supply device according to one of the preceding claims, characterized in that the transformer ( 12 ) is arranged upright on a mounting plate ( 18 ) and above the transformer ( 12 ) there is a housing frame ( 24 ) which carries all components ( 22 , 30 , 32 , 34 , 36 ) of the power supply device. 11. Power supply device according to the preceding claim, characterized in that the arrangement of the components ( 22 , 30 , 32 , 34 , 36 ) is designed as a unit that can be plugged onto the housing frame ( 24 ).