DE102014119138B3 - Wake up and wake up procedure for an electronic device with a self-wake up function - Google Patents

Abstract

A circuit arrangement (10) and a method for controlling a circuit arrangement (10) for an electronic device with a self-wake-up function are described, wherein the circuit arrangement (10) has a primary-side circuit arrangement (12) and a secondary-side circuit arrangement (14). The secondary-side circuit arrangement (14) has a second control unit (38), which is connected via a unidirectional transmission line (TX) and a unidirectional receiving line (RX) with an interface (22), via the interface (22) further electronic devices with the circuit arrangement (10) can be coupled. The receiving line (RX) has a second switching means (46), which is designed to disconnect the connection from the interface (22) to the second control unit (38) and to a capacitor (44), wherein the capacitor (44 ) Wake-up signals or wake-up information to the primary-side circuit arrangement (12) are transmitted. The transmission line (TX) has a third switching means (48), wherein the third switching means (48) establishes a connection from the transmission line (TX) to the capacitor (44) via the receiving line (RX) in order to transmit time information to the primary-side circuit arrangement (R). 12).

Description

The present invention relates to a wake-up circuit comprising a circuit arrangement for an electronic device with a self-wake-up function and a wake-up method for controlling a circuit arrangement for an electronic device with a self-wake-up function.

Electronic devices of consumer electronics can be operated in a standby mode to then immediately switch the devices back into an active state via, for example, a remote control. The standby mode is used to operate the device not fully in its active state and at the same time to enable a fast activation (switching on). Disadvantages of this standby state, however, are the high power consumption and high power consumption of the electronic devices in standby mode. Various proposals have therefore been made in the prior art as to how the power consumption and consumption of electronic devices, in particular consumer electronics, can be reduced.

Out DE 10 2010 032 513 A1 is a power-saving circuit for reducing the power consumption in a standby mode known.

DE 101 06 132 A1 discloses a wakeup circuit for an electronic device having optocouplers via which a power supply unit of the electrical device can be switched on or off.

Furthermore, circuits with a self-wake-up function are known from the prior art. A microcontroller with self-wake-up device is for example in DE 196 10 627 A1 described.

Electronic devices with a self-wake-up function should be operated in such a way that the power consumption during standby operation is as low as possible. The problem is that the self-wake requires to operate at least part of the electronic device or to switch active. Electronic devices with a self-wake up feature a circuit that triggers waking when, for example, certain events occur or a specific time is reached (eg, timers, etc.). In the case of the electronic devices known from the prior art, therefore, a part of the secondary-side circuit arrangement remains active in order to enable the waking-up of the electronic device in a standby mode. This means that at least part of the secondary-side circuit arrangement is supplied with power, which leads to an increased power consumption. For example. In the standby mode, the electronic devices of the prior art have a power consumption of at least 0.5 watts.

From the earlier patent application DE 10 2013 109 544 A1 a method and a circuit arrangement for changing the operating state of an electronic device is known, which has at least one primary-side circuit arrangement with a connection to a voltage source and a computing unit, wherein the arithmetic unit is provided with a device for reconstructing a wake-up signal and a switching means, via the Connection connected to the voltage source. Furthermore, the electronic device has a secondary-side circuit arrangement with an interface and a control unit, wherein the interface with the control unit and with the device for the reconstruction of the wake-up signal and the control unit are connected to the switching means. The interface is connected to the device for reconstructing the wake-up signal via at least one first capacitor, via which the transmitted wake-up signal is transmitted in a filtered manner to the device for reconstructing the wake-up signal, wherein the computing unit switches the switching device in dependence on the reconstructed wake-up signal.

The object of the present invention is to provide a circuit arrangement for an electronic device with a self-wake-up function and a method for controlling a circuit arrangement for an electronic device with a self-wake function, wherein the power consumption and the power consumption in standby mode compared to known circuits and devices are reduced.

According to the invention the object is achieved by a circuit arrangement with the technical features specified in claim 1 and by a method having the technical features specified in claim 9.

Advantageous developments of the invention are specified in the dependent claims in detail.

In a circuit arrangement for an electronic device with a self-wake up function, comprising
a primary-side circuit arrangement, comprising a first switching means and a first control unit, wherein the first switching means is connected to a voltage source and a power supply, wherein the first control unit is designed to control an electrical connection from the voltage source to the power supply via the first switching means,
a secondary-side circuit arrangement, comprising a second control unit and an interface, wherein the second control unit with the power supply and via a unidirectional transmission line and a unidirectional receiving line to the interface and connected via the receiving line to a capacitor,
the receiving line is connected via the capacitor to the first control unit and has a second switching means, wherein the second switching means is adapted to disconnect the connection from the interface to the second control unit and to the capacitor,
the transmission line has a third switching means, wherein the third switching means is designed to establish a connection from the transmission line to the capacitor via the receiving line, and
the second switching means and the third switching means are controllable by the second control unit.

In the circuit arrangement, the waking up of the electronic device on the primary-side circuit arrangement is made possible. It is therefore not necessary to supply the secondary-side circuit arrangement with power, so that the secondary-side circuit arrangement has no power consumption in standby mode. The awakening of the electronic device takes place on the primary-side circuit arrangement by the first control unit in the presence of a wake-up signal. The wake-up signal triggers the waking of the electronic device. In this case, the first control unit causes, for example, a closing of the first switching means, whereby a connection of the secondary-side circuit arrangement via the power supply takes place. So that the first control unit receives a time (date, time) at which the outputting of the wake-up signal is to take place, the first control unit must be notified of the time. This is usually done during operation of the electronic device, the secondary-side circuit arrangement is actively connected and connected via the power supply to the power source. A user can then, for example, make a programming via a remote control or set a timer. For example, via the timer, it is predetermined that the electronic device should be switched on by itself at a specific time on a specific day by the electronic device. This time information (date, time) must be transmitted from the second control unit to the first control unit from the secondary-side circuit arrangement to the primary-side circuit arrangement. For this purpose, the second control unit initiates opening of the second switching means, and only for the period of time information transmission, so that the connection is disconnected from the interface to the second control unit and to the capacitor, whereby no signals are available from the receiving line and the interface connected thereto other electronic devices to the second control unit or the capacitor can be sent. In addition, the second control unit causes a closing of the third switching means, so that the transmission line is connected via the third switching means to the receiving line. Then, the time information can be sent via the transmission line to the first control unit, wherein the time information is transmitted via the capacitor to the first control unit. The arrangement of the second switching means and the third switching means is selected so that there is no connection between other electronic devices and the second control unit and the capacitor for transmitting the time information. The third switching means establishes a connection between the transmission line and the reception line so that the time information can be transmitted. In this case, the transmission line is connected or connectable only to the interface and via the third switching means to the primary-side circuit arrangement. A permanent connection between the primary-side circuit arrangement and the secondary-side circuit arrangement via the transmission line does not exist. Disconnecting the receive line from the interface ensures that no signals are received from other electronic devices at the time the time information is transmitted. Such signals could disturb, distort and even prevent the transmission of time information. In particular, the receiving line and the transmission line are defined so that only one communication may take place in one direction. This is required to establish an internal data connection from the second control unit via the transmission line, the third closed switching means and the capacitor to the first control unit. Thus, a transmission of the time information to the first control unit is possible, with all the information for an independent wake up on the primary-side circuit arrangement are present. Since only one transmission circuit (in the case of transmitting the time information, the second control unit) may be operated on one line (transmission line, reception line), the second switching means must be open at this time. After the time information has been sent to the first control unit, the third switching means must be reopened and the second switching means closed again to allow communication with other electronic devices and the reception of signals (eg, external wake-up signal) from the other electronic devices.

The circuit arrangement according to the invention therefore enables a standby mode with a low line pick-up, wherein the secondary-side circuit arrangement does not have to be operated for self-wakeup.

The first control unit may have a timer circuit, which can be transmitted via the transmission line, the third switching means and the receiving line time information on the capacitor when the second switching means the Connection between the interface to the second control unit and to the capacitor is disconnected. The timer circuit is part of the first control unit.

The first control unit or the timer circuit may have a memory in which the time information can be stored. The time information (s) transmitted via the capacitor between the secondary-side circuit arrangement and the primary-side circuit arrangement is / are written into the memory. The memory is configured as a nonvolatile memory such that the time information also remains stored during the standby mode and when the electronic device is completely disconnected from the voltage source.

The timing circuit may comprise a crystal oscillator and a comparison logic, wherein the comparison logic is adapted to compare time information stored in the memory with a system time and to output a wake-up signal upon a match. The comparison logic accesses the memory and performs a comparison of the time information stored therein with the system time provided. The quartz oscillator provides the clock for the timer circuit. The timer circuit can be set to a specific time and date. This is done, for example, during initial operation of the electronic device. The timer circuit can have a battery or, via capacitors (eg, storage capacitors), receive or provide energy for operating the timer circuit and other components of the first control unit for a certain period of time. The capacitors are charged, for example, when the electronic device is in an active state. The timer circuit has at least its own power supply (eg, battery or storage capacitors), a crystal oscillator for outputting a clock for the system time, and comparison logic which compares stored time values with a system time, which system time can be provided by the comparison logic through the clock of the crystal oscillator , and outputs a wake-up signal if there is a coincidence of the system time (date, time) with a stored time information (date, time).

The first control unit may comprise a wake-up circuit which, after receiving the wake-up signal in a standby operating state, establishes a connection between the voltage source and the power supply via the first switching means. The wake-up circuit is part of the first control unit and, upon receipt of the wake-up signal from the timer circuit, causes the first switching means to close.

The electronic device may be connectable via the interface with at least one further electronic device, wherein the interface is designed as a communication interface.

The wake-up circuit may comprise a reconstruction circuit which is designed to reconstruct the information parts of the time information transmitted via the capacitor and / or to reconstruct the high-pass information transmitted via the capacitor of wake-up signals that can be transmitted via the interface and the receive line from further electronic devices , The awakening of the electronic device is not limited to self-waking, but can also be done via a wake-up signal of another device connected to the electronic device. The reconstruction circuit is part of the wake-up circuit and therefore also a part of the first control unit. The design of the timer circuit, wake-up circuit and reconstruction circuit and the first control unit is variable. Thus, in one embodiment, the circuits may be integrated in an overall circuit (eg of a chip). Furthermore, other circuits can be integrated or provided, but they are also separated and independently operable and the remaining circuits. The reconstruction circuit serves primarily to reconstruct the signals (wake-up signal / time information) originally transmitted to the capacitor on the secondary-side circuit arrangement from the transferred high-pass information which is transmitted from the capacitor on the primary-side circuit arrangement.

The first switching means, the second switching means and / or the third switching means may be formed as an analog switch. In particular, the first switching means, the second switching means and / or the third switching means transistors and / or the capacitor may be a Y-capacitor.

The capacitor may be a Y capacitor in other embodiments. The capacitor has a small capacitive value for this purpose. The high-pass information of the time information and / or the wake-up signal is transmitted to the primary-side circuit arrangement via the Y capacitor, which complies with the requirements for secure network isolation, whereby the original information of the time information and / or the wake-up signal is restored via the reconstruction circuit. The timer circuit may have a power consumption of 0.1 mW in one embodiment. The power consumption is therefore significantly lower than in devices known from the prior art.

In this case, the circuit arrangement has a significantly reduced power consumption compared with the prior art. The first control unit can also be connected to the voltage source via capacitive voltage dividers (capacitors). The power supply for the reconstruction circuit can also be done via these capacitors. For this purpose, the capacitors must be designed according to the required power consumption.

The reconstruction circuit may be part of the first control unit, wherein the first control unit is integrated in a chip or in another circuit. The circuit may comprise a filter and electronic components which serve to reconstruct a high-pass-filtered wake-up signal or the high-pass-filtered time information. Thus, in the circuit to the and / or through the capacitor between the primary-side circuit arrangement and the secondary-side circuit arrangement high-pass filtered time information / wake-up signal an adjustable DC voltage can be added, wherein the signal formed therefrom is filtered. The filtering and the adjustable DC voltage can be determined and changed by the first control unit. The filtered signal is fed together with an adjustable threshold value to an amplifier which, for example, is applied to the set input of a flip-flop. At the reset input of the flip-flop, the signal is present, which is output by another amplifier, wherein applied to the inputs of the amplifier, the filtered signal and another adjustable threshold. The adjustable thresholds may also be adjustable and changeable by the first control unit. The signal output of the flip-flop reproduces the reconstructed wake-up signal such that a wake-up information or a wake-up event is detected by the first control unit and correspondingly the first switching means for producing the power supply or establishing an electrical connection between the voltage source and the second control unit and the power supply is switchable. The signal output of the flip-flop also reflects the reconstructed time information so that it can be fed to the memory of the timer circuit or the first control unit. In further embodiments, the information transmitted via the capacitor information can be stored in the memory and the comparison logic of the timer circuit generates therefrom a time information.

In the circuits (eg wake-up circuit, reconstruction circuit) analog and digital filters can be provided to filter out disturbance information and to adapt to different baud rates. The circuits may also include analog external / internal circuits and / or digital external / internal circuits (with analogue to digital transducers at the inputs), as well as a software solution in a microprocessor (with corresponding analogue to digital converters) the inputs).

The interface can be designed as an RS232 interface. Such an interface is provided as a standard for a variety of electronic devices, in particular entertainment electronic devices.

The power supply is supplied from the primary-side circuit arrangement to the secondary-side circuit arrangement. Furthermore, a filter device can be arranged between the voltage source and the first switching means and the first switching means and the voltage source can be connected to the filter unit.

In further embodiments, the power supply has a circuit for increasing the power factor.

• – eine primärseitige Schaltungsanordnung mit einem ersten Schaltmittel und einer ersten Steuereinheit, wobei die erste Steuereinheit eine Zeitgeberschaltung aufweist und mit einer Spannungsquelle und einem Netzteil verbunden ist,
• – eine sekundärseitige Schaltungsanordnung mit einer zweiten Steuereinheit und einer Schnittstelle, wobei die zweite Steuereinheit mit dem Netzteil und über eine unidirektionale Sendeleitung und eine unidirektionale Empfangsleitung mit der Schnittstelle und über die Empfangsleitung mit einem Kondensator verbunden ist,
• – ein zweites Schaltmittel in der Empfangsleitung, wobei die Empfangsleitung über den Kondensator mit der ersten Steuereinheit verbunden ist, und
• – ein drittes Schaltmittel in der Sendeleitung,

werden in einem aktiven Betriebszustand Zeitinformationen zum Aufwecken des unterhaltungselektronischen Geräts der zweiten Steuereinheit übermittelt,
veranlasst die zweite Steuereinheit zur Übertragung der Zeitinformationen an die Zeitgeberschaltung der ersten Steuereinheit das zweite Schaltmittel, die Verbindung über die Empfangsleitung zwischen der Schnittstelle und der zweiten Steuereinheit sowie dem Kondensator zu trennen,
veranlasst die zweite Steuereinheit zur Übertragung der Zeitinformation an die Zeitgeberschaltung der ersten Steuereinheit das dritte Schaltmittel, eine Verbindung von der Sendeleitung zu dem Kondensator über die Empfangsleitung herzustellen,
stellt die zweite Steuereinheit nach der Übertragung der Zeitinformation an die Zeitgeberschaltung der ersten Steuereinheit die Verbindung zwischen der Schnittstelle und der zweiten Steuereinheit sowie dem Kondensator über das zweite Schaltmittel in der Empfangsleitung wieder her und trennt die Verbindung von der Sendeleitung zu dem Kondensator über die Empfangsleitung durch das dritte Schaltmittel.In a method of controlling a circuit arrangement for an electronic device having a self-wake function, comprising

• A primary-side circuit arrangement having a first switching means and a first control unit, the first control unit having a timer circuit and being connected to a voltage source and a power supply unit,
• A secondary-side circuit arrangement having a second control unit and an interface, wherein the second control unit is connected to the power supply unit and via a unidirectional transmission line and a unidirectional reception line to the interface and via the reception line to a capacitor,
• A second switching means in the receiving line, the receiving line being connected to the first control unit via the capacitor, and
• A third switching means in the transmission line,

in an active operating state, time information for waking up the entertainment electronic device is transmitted to the second control unit,
causes the second control unit for transmitting the time information to the timer circuit of the first control unit, the second switching means, the connection via the receiving line between the Interface and the second control unit as well as the capacitor to separate
the second control unit for transmitting the time information to the timer circuit of the first control unit causes the third switching means to establish a connection from the transmission line to the capacitor via the reception line,
After transmission of the time information to the timer circuit of the first control unit, the second control unit restores the connection between the interface and the second control unit and the capacitor via the second switching means in the reception line and disconnects the connection from the transmission line to the capacitor via the reception line the third switching means.

The time information for waking up the electronic device in a standby mode may be input by a user in an active operating state where there is a connection of the secondary side circuitry to the voltage source via the closed first switching means and the power supply. The time information is, for example, received by a remote control via an infrared interface connected to the second control unit. The second control unit then causes an opening of the second switching means and a closing of the third switching means to the time information (date, time) via the transmission line, the third switching means and the receiving line to the capacitor and via the capacitor to the timer circuit of the first To send control unit. The opening of the second switching means and the closing of the third switching means are effected by a corresponding control of the second control unit only for the duration of transmitting the time information. In the transmission of the time information from the secondary circuitry to the primary circuitry there is no overlay of the output from the second control unit time information for waking the electronic device with signals from other electronic devices that are connected via the interface to the electronic device, and to no misinterpretation by signals from the other electronic devices.

The time information transmitted from the second control unit to the timer circuit of the first control unit may be stored in a memory of the first control unit or the timer circuit.

Further, the timer circuit may comprise a crystal oscillator and a comparison logic, and the comparison logic may compare the time values stored in the memory with a system time and, in the event of a match, output a wake-up signal.

The first control unit may further comprise a wake-up circuit which, after receiving the wake-up signal in a standby operating state, establishes a connection between the voltage source and the power supply via the first switching means.

Furthermore, the wake-up circuit may have a reconstruction circuit which reconstructs the information parts of the time information transmitted via the capacitor and / or reconstructs high-pass information transmitted by the capacitor of wake-up signals which are transmitted via the interface and the receive line by further electronic devices.

The reconstruction circuit may transmit the reconstructed time information to the timer circuit and / or the reconstructed wake-up signals to the wake-up circuit, the wake-up circuit, upon receipt of the reconstructed wake-up signals, establishing a connection between the voltage source and the power supply via the first switching means.

With regard to the embodiments of the method and the resulting advantages, reference is made to the advantages described for the circuit arrangement according to the invention.

The circuit arrangement as well as the method for controlling a circuit arrangement for an electronic device with a self-wake-up function can be used, for example, for entertainment electronic devices, such as television sets, receivers, set-top boxes, etc. The wake-up time via the inputable time information or time values can be, for example, a time that can be set by a user of an electronic device (timer functionality). Furthermore, an adjustment with stored times can be made from an electronic program guide (EPG) so that the electronic device and, for example, another entertainment electronic device are automatically woken up via the circuit arrangement and trigger the recording of a television program. The power consumption during standby operation is significantly reduced compared to known circuit arrangements, since in standby mode, the secondary-side circuit arrangement has no power consumption and is not operated. A waking up of the electronic device takes place via the first control unit, wherein a further electronic device (eg recorder) connected to the electronic device can also be woken up. For example, the recorder can receive a wake-up signal via the transmission line of the second control unit after the electronic device has woken up.

Other objects, features, advantages and applications will become apparent from the following description of the figures of non-limiting embodiments.

In the drawings shows:

1 a schematic representation of a circuit arrangement with Selbstweckfunktion; and

2 a further schematic representation of a circuit arrangement with Selbstweckfunktion.

Parts indicated by like reference characters in the figures substantially correspond to each other unless otherwise specified. Further, it is omitted to describe components of the circuitry which are not essential to the understanding of the teachings disclosed herein.

The in the 1 and 2 Circuit arrangements shown are part of an electronic device, which is not shown here. The electronic device may be, for example, an entertainment electronic device such as a television and has a plurality of further units and components, which, however, to illustrate the essential aspects of the circuit arrangement 10 and the method for changing an operating state of the electronic device via a self-wake up function are not shown. The electronic device may include, for example, a receiver, a hard disk, a screen and / or at least one speaker.

The electronic device can also be controlled and operated via a remote control (eg remote control). The electronic device may also have an interface 22 be connectable with another electronic device.

1 shows a circuit arrangement 10 used in a primary-side circuit arrangement 12 and a secondary side circuit arrangement 14 shared. The primary-side circuit arrangement 12 and the secondary side circuit arrangement 14 may comprise further circuits, connections and components which will not be further described.

The primary-side circuit arrangement 12 has a power plug 16 on, which via an on / off switch 18 the electronic equipment is powered. At the in 1 shown state is the on / off switch 18 shown in its open position so that there is no power supply for the electronic device and the electronic device is neither in an active operating state nor in a standby state. Such an on / off switch 18 is usually then operated or spent in the open state, if the electronic device should not be operated for a long time. Is the on / off switch 18 in its closed position, this is done via the power plug 16 a power supply for the electronic device.

A power supply 30 serves to provide the for the operation of the electronic device on the secondary side with the secondary-side circuit arrangement 14 required performance. This is indicated by the power supply 30 a power factor increase circuit and a line filter. A filter device 28 is used to filter the operating voltage and is equipped with a first switching means 32 connected. The first switching means 32 when closed, provides a connection between a power supply 30 and the power supply via the mains plug 16 ready. The first switching means 32 is from a first control unit 24 controlled. The first control unit 24 has a wake-up circuit 39 and a timer circuit 40 on. Furthermore, the first control unit 24 contain further control components, which will not be described further here.

The wake-up circuit 39 has a reconstruction circuit 26 on. The reconstruction circuit 26 is used to reconstruct a via a capacitor 44 from the secondary side circuit 14 transmitted wake-up signal via an interface 22 is received by another electronic device. After the wake-up signal through the reconstruction circuit 26 reconstructed causes the wake-up circuit 39 a closing of the first switching means 32 , In addition, the reconstruction circuit is used 26 for reconstructing a time information, acting as a signal through the capacitor 44 from a control circuit 42 a second control unit 38 to the wake-up circuit 39 is sent. After the signal with the time information by the reconstruction circuit 26 it is reconstructed by the wake-up circuit 39 to the timer circuit 40 transfer. The wake-up circuit 39 makes a distinction as to whether the reconstructed signal includes time information or a wake-up event. Depending on the result of discrimination, the signal of the timer circuit becomes 40 passed or it is started a wake-up, wherein by closing the first switching means 32 a power supply for the secondary-side circuit arrangement 14 he follows.

The timer circuit 40 has a quartz oscillator 36 , a comparison logic 34 and a memory, not shown. The memory of the timer circuit 40 can in the comparison logic 34 be integrated. The memory is designed as a volatile memory, which is made non-volatile by the addition of a capacitor buffering, for example at least for a few days. The reconstructed time information is stored in the memory. For example. the date and a time is stored at which a self-wake up of the electronic device should take place. The time information is provided by a user of the electronic device of the second control unit 38 communicated and the control circuit 42 transmits the time information about the capacitor 44 , The quartz oscillator 36 works as Clock for the timer circuit 40 , whereby a system time is embarrassed. The comparison logic 34 compares the time information stored in the memory with the system time. If there is a match, then gives the timer circuit 40 via the comparison logic 34 a wake-up signal and sends the wake-up signal to the wake-up circuit 39 , The wake-up circuit 39 then triggers a wake-up, wherein the first switching means 32 closed and a power supply for the secondary-side circuit arrangement 14 provided.

The first control unit 24 is via a capacitor 19 powered. At the condenser 19 it is a part of a capacitive voltage divider, the voltage for the on the primary-side circuit 12 existing and operated in standby circuit parts supplies. About the capacitor 19 becomes the power supply for the wake-up circuit 39 and the timer circuit 40 provided. Other components of the first control unit 24 Not needed for waking up the electronic device, therefore, do not need to be powered in standby mode.

In the in 1 The embodiment shown is the timer circuit 40 a RTC ("Real Time Clock") module, which has a power consumption of 35 μA at an operating voltage of 3 V. The power consumption is therefore only 100 mW in standby mode. The energy supply can be done via a separately provided storage capacitor.

Closing the first switching means 32 provides an electrical connection from the power plug 16 and the voltage source to the power supply 30 ago. The first switching means 32 can be formed for this purpose, for example, as a transistor, wherein the driving of the transistor via the wake-up circuit 39 he follows.

The capacitor 44 has a small capacitive value and is preferably formed as a Y-capacitor. Such a Y-capacitor holds the requirements for safe network separation between the primary-side circuit arrangement 12 and the secondary side circuit arrangement 14 one.

About the capacitor 44 Only high-pass filtered portions (high-pass information) of the signal with the time information and high-pass filtered portions (high-pass information) of the wake-up signal are applied to the primary-side circuitry 12 to the reconstruction circuit 26 transfer. The reconstruction circuit 26 generates from the high-pass information a time information or a wake-up signal, which causes the wake-up circuit 39 the first control means 32 closes to connect from the voltage source to the power supply 30 manufacture. After the electrical connection for the secondary-side circuit 14 over the power supply 30 has been provided, the second control unit 38 the secondary-side circuit arrangement 14 go into their normal operating mode. In the normal operating mode, the second control unit becomes 38 and powering the secondary side circuits and components. Subsequently, the second control unit 38 for example, cause the playback of a television program.

The secondary-side circuit arrangement 14 points next to the second control unit 38 that with the power supply 30 further components are described below, with only those essential for the wake-up functionality (self-wake function, wake-up via external wake-up signal) being described below.

The second control unit 38 is via a receiving line R _X and a transmission line T _X with the interface 22 connected. The receiving line R _X and the transmission line T _X are formed as unidirectional lines. Therefore, only information can be received via the reception line R _X and only information can be sent via the transmission line T _X. Furthermore, only one communication between two circuits can always take place, with one signal each being transmitted and received. About the interface 22 is the circuit arrangement 10 of the electronic device with a signal line 20 connected, being over the signal line 20 There is a connection to another electronic device. The signal line 20 this may also have a receiving line and a transmission line, via which a bidirectional communication between the electronic device and the other electronic device takes place.

The second control unit 38 has a control circuit 42 on. The control circuit 42 is a part of the second control unit 38 , The second control unit 38 also has other components and circuits. The control circuit 42 sends the time information to self-wake up the electronic device via the capacitor 44 to the wake-up circuit 39 , The control circuit 42 also controls a second switching means 46 and a third switching means 48 ,

The receiving line R _X is connected to the control circuit 42 and with the capacitor 44 connected. The transmission line T _X is connected to the control circuit 42 and the interface 22 connected. In the receiving line R _X is the second switching means 46 which is a transistor, for example. The second switching means 46 serves to, the Connection from the interface 22 to the capacitor 44 and to the control circuit 42 to separate. The third switching means 48 which is a transistor, for example, is connected to the transmission line T _X such that a connection from the control circuit 42 via the transmission line T _X , the third switching means 48 and the receiving line R _X to the capacitor 44 provided. For this purpose, the second switching means 46 and the third switching means 48 from the control circuit 42 driven.

The receiving line R _X and the transmission line T _X are used in normal operation, ie power supply of the electronic device via the power plug 16 and the closed first switching means 32 , for bidirectional communication between the control circuit 42 and the second control unit 38 and another electronic device via the interface 22 and the signal line 20 ,

In normal operation - active operating state - can be set by a user of the electronic device, for example. Via a remote control, a time when the electronic device should automatically go from a standby mode in the active operating state. For this purpose, the second control unit 38 connect to a receiver for the signals coming from the remote control to the second control unit 38 be sent. The signals then include a wake-up time. The wake-up time is defined by time information indicating the date and time of self-awakening. The user can also specify several times. Also, the user can select a television program to be broadcast in the future via a control menu displayed on a screen. By selecting an appropriate icon on the screen, programming of a recorder for recording the television program and / or switching on (activating) the electronic device is initiated. In this case, the time information about the time of self-wake up to play the television program and / or record the TV program can be taken from an electronic program guide, the user does not have to enter date and time. The time information must then be sent to the memory of the timer circuit 40 be transferred so that a self-wake up, as described above, can take place.

Since the transmission line T _X and the receiving line R _{X are formed} as unidirectional lines and no signals can be transmitted in parallel (eg. Time information signal and signal from further electronic device via interface 22 ) must communicate between the second control unit 38 and the other electronic device for the duration of sending the time information are interrupted. Furthermore, there is no transmission connection between the second control unit 38 and the first control unit 24 or the timer circuit 40 ,

In order to transmit the time information can switch the control circuit 42 the second switching means 46 so that the connection between the interface 22 and the second control unit 38 and the capacitor 44 is disconnected. In addition, the control circuit switches 42 the third switching means 48 so that the third switching means 48 establishes a connection between the transmission line T _X and the reception line R _X. The connection between the transmission line T _X and the reception line R _X is after the separation point (second switching means 46 ) produced.

Then there is a connection from the control circuit 42 to the capacitor 44 , The control circuit 42 then sends a signal with the time information via the transmission line T _X , the third switching means 48 and the receiving line R _X to the capacitor 44 , The high-pass information of the signal with the time information is passed through the capacitor 44 the reconstruction circuit 26 which reconstructs the high-pass information to a signal with the time information. Thereafter, the time information about the wake-up circuit 39 the timer circuit 40 transmit and the time information in the memory of the timer circuit 40 saved. The comparison logic 34 compares the system time with the time information and gives a wake-up signal to the wake-up circuit in standby mode 39 off if the system time matches the stored time information (date, time).

After the time information from the control circuit 42 to the reconstruction circuit 26 was sent controls the control circuit 42 the second switching means 46 such that the connection between the interface 22 and the second control unit 38 and the capacitor 44 is restored. At the same time, the control circuit causes 42 an opening of the third switching means 48 such that the connection between the transmission line T _X and the reception line R _{X is} via the third switching means 48 is disconnected.

The connection between the control circuit 42 and the capacitor 44 via the transmission line T _X and the reception line R _X via the third switching means 48 is maintained only as long as the time information is transmitted. Likewise, the connection between the interface 22 and the second control unit 38 and the capacitor 44 only so long over the second switching means 46 separated as the time information is transmitted. After transmission, the communication between the second control unit 38 and the another electronic device via the interface 22 as well as the transmission line T _X and the receiving line R _{X are} resumed regular.

In particular, in a standby mode, a wake-up signal (external wake-up signal) can also be received by the further electronic device. The wake-up signal is sent via the interface 22 received and via the receiving line R _X and the capacitor 44 the reconstruction circuit 26 which reconstructs the wake-up signal from the transmitted high-pass information. Upon receipt of the wake-up signal, the wake-up circuit triggers 39 a closing of the first switching means 32 off, so that the electronic device goes into its active state. The secondary-side circuit arrangement 14 therefore requires no energy in standby mode, since wake-up signals via the receiving line R _X and the capacitor 44 to the primary circuitry 12 and the wake-up information (time information) for self-wake up in the primary-side circuitry 12 is deposited.

For opening and closing the second switching means 46 and the third switching means 48 gives the control circuit 42 a signal indicating the state whether transmission of time information should be made or not. This can be done via a control line of the control circuit 42 no signal (logical 0) will be output if no transmission is to take place or should take place. If a transmission is to take place, a signal (logical 1) is output.

Logically 0 means that the control circuit 42 no change of the third switching means 48 this is opened, and does not establish a connection between the receiving line R _X and the transmission line T _X when the control circuit 42 no signal (0) is output. For the second switching means 46 This is due to the inversion via the inverter 50 in that the second switching means 46 is closed and thus a connection from the interface 22 to the control circuit 42 and the capacitor 44 provides. If the transmission of a time information is to be performed, then the control circuit 42 a signal (1) is output, resulting in a closing of the third switching means 48 and by inverting this signal through the inverter 50 to an opening of the second switching means 46 leads. As a result, the connection from the further electronic device via the unidirectional receiving line R _X to the control circuit 42 and to the second control unit 38 interrupted. When the transmission of the time information is completed, the control circuit outputs 42 no signal (0) more, resulting in an opening of the third switching means 48 and closing the second switching means 46 leads.

It should be noted that the receiving line R _X and the transmission line T _X not only with the control circuit 42 must be connected, as in 1 shown.

2 shows a further schematic representation of the circuit arrangement 10 with a primary-side circuit arrangement 12 and a secondary side circuit arrangement 14 , Regarding the in 2 displayed blocks is on the in 1 described circuit arrangement 10 directed.

The wake-up circuit 34 has an I2C communication link with the timer circuit 40 via lines SDA and SCL. From the timer circuit 40 A wake-up signal ("RTC Wake") is output when a match of one in the memory of the timer circuit 40 stored time information with the provided system time is present. The "RTC Wake" signal controls leaving the standby mode.

The control circuit 42 for transmitting time information for the timer circuit 40 via the control line, a drive signal ("UART SWITCH"), resulting in an opening of the second switching means 46 and closing the third switching means 48 leads. The second switching means 46 then disconnects the 'UART RxD' line (receive line). The third switching means 48 then establishes a connection between the 'UART TxD' line (transmit line) and the 'UART RxD' line. After the time information has been transferred through the capacitor, the connection in the 'UART RxD' line will be via the second switching means 46 and the connection between the 'UART TxD' line and the 'UART RxD' line via the third switching means 48 separated.

The over the capacitor 44 transmitted information pieces of the time information are in the reconstruction circuit 26 reconstructed to the time information. The reconstruction circuit 26 transmits the reconstructed (recovered) time information to the wake-up circuit via the 'RxD' line 39 , which the time information to the timer circuit 40 transfers. The timer circuit 40 stores the time information in its memory and makes a comparison as already described with respect to 1 described. The reconstruction circuit 26 can also be part of the wake-up circuit 39 be educated.

In addition, wake-up signals may be received from another electronic device and to the wake-up circuit 39 be sent without the secondary-side circuitry 14 must be operated.

LIST OF REFERENCE NUMBERS

10

circuitry

12

primary-side circuit arrangement

14

secondary-side circuit arrangement

16

power plug

18

On / off switch

19

capacitor

20

signal line

22

interface

24

first control unit

26

reconstruction circuit

28

filtering device

30

power adapter

32

first switching means

34

comparison logic

36

crystal oscillator

38

second control unit

39

wake-up

40

Timer circuit

42

control circuit

44

capacitor

46

second switching means

48

third switching means

50

inverter

R _X

receiving line

T _X

transmission line

Claims (14)

Circuit arrangement for an electronic device with a self-wake-up function, comprising a primary-side circuit arrangement ( 12 ), comprising a first switching means ( 32 ) and a first control unit ( 24 ), wherein the first switching means ( 32 ) with a voltage source and a power supply ( 30 ), the first control unit ( 24 ) is adapted to an electrical connection from the voltage source to the power supply ( 30 ) via the first switching means ( 32 ), a secondary-side circuit arrangement ( 14 ), comprising a second control unit ( 38 ) and an interface ( 22 ), the second control unit ( 38 ) with the power supply ( 30 ) and via a unidirectional transmission line (T _X ) and a unidirectional receiving line (R _X ) with the interface ( 22 ) and via the receiving line (R _X ) with a capacitor ( 44 ), wherein the receiving line (R _X ) via the capacitor ( 44 ) with the first control unit ( 24 ) and a second switching means ( 46 ), wherein the second switching means ( 46 ) is adapted to disconnect from the interface ( 22 ) to the second control unit ( 38 ) and to the capacitor ( 44 ), the transmission line (T _X ) a third switching means ( 48 ), wherein the third switching means ( 48 ) is adapted to connect from the transmission line (T _X ) to the capacitor ( 44 ) via the receiving line (R _X ), and the second switching means ( 46 ) and the third switching means ( 48 ) from the second control unit ( 38 ) are controllable. Circuit arrangement according to claim 1, wherein the first control unit ( 24 ) a timer circuit ( 40 ), via the transmission line (T _X ), the third switching means ( 48 ) and the receiving line (R _X ) time information about the capacitor ( 44 ) are transferable when via the second switching means ( 46 ) the connection between the interface ( 22 ) to the second control unit ( 38 ) and to the capacitor ( 44 ) is disconnected. Circuit arrangement according to claim 2, wherein the first control unit ( 24 ) or the timer circuit ( 40 ) have a memory in which the time information can be stored. Circuit arrangement according to Claim 3, in which the timer circuit ( 40 ) a quartz oscillator ( 36 ) and a comparison logic ( 34 ) configured to compare time information stored in the memory with a system time and to output a wake-up signal upon coincidence. Circuit arrangement according to claim 4, wherein the first control unit ( 24 ) a wake-up circuit ( 39 ), which, after receiving the wake-up signal in a standby mode, connect between the voltage source and the power supply ( 30 ) via the first switching means ( 32 ). Circuit arrangement according to one of claims 1 to 5, wherein the electronic device via the interface ( 22 ) is connectable to at least one further electronic device, wherein the interface ( 22 ) is designed as a communication interface. Circuit arrangement according to Claim 5 or 6, the wake-up circuit ( 39 ) a reconstruction circuit ( 26 ), which is designed to be connected via the capacitor ( 44 ) to reconstruct transmitted information parts of the time information and / or via the capacitor ( 44 ) transmitted high-pass information of wake-up signals transmitted via the interface ( 22 ) and the receiving line (R _X ) of other electronic devices are to be reconstructed. Circuit arrangement according to one of claims 1 to 7, wherein the first switching means ( 32 ), the second switching means ( 46 ) and / or the third switching means ( 48 ) Are transistors and / or the capacitor ( 44 ) is a Y capacitor. Method for controlling a circuit arrangement for an electronic device with a self-wake-up function, comprising - a primary-side circuit arrangement ( 12 ) with a first switching means ( 32 ) and a first control unit ( 24 ), the first control unit ( 24 ) a timer circuit ( 40 ) and with a voltage source and a power supply ( 30 ), - a secondary-side circuit arrangement ( 14 ) with a second control unit ( 38 ) and an interface ( 22 ), the second control unit ( 38 ) with the power supply ( 30 ) and via a unidirectional transmission line (T _X ) and a unidirectional receiving line (R _X ) with the interface ( 22 ) and via the receiving line (R _X ) with a capacitor ( 44 ), - a second switching means ( 46 ) in the receiving line (R _X ), wherein the receiving line (R _X ) via the capacitor ( 44 ) with the first control unit ( 24 ), and - a third switching means ( 48 ) in the transmission line (T _X ), wherein in an active operating state time information for waking up the entertainment electronic device of the second control unit ( 38 ), the second control unit ( 38 ) for transmitting the time information to the timer circuit ( 40 ) of the first control unit ( 24 ) the second switching means ( 46 ) causes the connection via the receiving line (R _X ) between the interface ( 22 ) and the second control unit ( 38 ) as well as the capacitor ( 44 ), the second control unit ( 38 ) for transmitting the time information to the timer circuit ( 40 ) of the first control unit ( 24 ) the third switching means ( 48 ) causes a connection from the transmission line (T _X ) to the capacitor ( 44 ) via the receiving line (R _X ), the second control unit ( 38 ) after the transmission of the time information to the timer circuit ( 40 ) of the first control unit ( 24 ) the connection between the interface ( 22 ) and the second control unit ( 38 ) as well as the capacitor ( 44 ) via the second switching means ( 46 ) in the receiving line (R _X ) and the connection from the transmission line (T _X ) to the capacitor ( 44 ) via the receiving line (R _X ) by the third switching means ( 48 ) separates again. Method according to claim 9, wherein the information provided by the second control unit ( 38 ) to the timer circuit ( 40 ) of the first control unit ( 24 ) transmitted time information in a memory of the first control unit ( 24 ) or the timer circuit ( 40 ) get saved. Method according to claim 10, wherein the timer circuit ( 40 ) a quartz oscillator ( 36 ) and a comparison logic ( 34 ) and the comparison logic ( 34 ) compares the time values stored in the memory with a system time and outputs a wake-up signal upon a match. Method according to claim 11, wherein the first control unit ( 24 ) a wake-up circuit ( 39 ), which, after receiving the wake-up signal in a standby mode, connect between the voltage source and the power supply ( 30 ) via the first switching means ( 32 ). Method according to claim 12, wherein the wake-up circuit ( 39 ) a reconstruction circuit ( 26 ), which via the capacitor ( 44 ) reconstructed information parts of the time information and / or via the capacitor ( 44 ) transmitted high-pass information of wake-up signals transmitted via the interface ( 22 ) and the receiving line (R _X ) are transmitted from other electronic devices, reconstructed. Method according to claim 13, wherein the reconstruction circuit ( 26 ) the reconstructed time information to the timer circuit ( 40 ) and / or the reconstructed wake-up signals to the wake-up circuit ( 39 ), wherein the wake-up circuit ( 39 ) after receiving the reconstructed wake-up signals, make a connection between the voltage source and the power supply ( 30 ) via the first switching means ( 32 ).

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