JP3172395U - Batteryless digital TV receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery-less digital TV signal device which receives an operating power and a digital TV signal from a mobile terminal, decodes and encodes the digital TV signal, and sends the digital TV signal to the mobile terminal for reproduction. .. When a batteryless digital TV receiver is connected to a mobile terminal, a switching power conversion module obtains power output from the mobile terminal through a connector, limits the operating power under a specific current, and operates. Power is supplied to the RF receiver module, digital TV processor and authentication chip. After the authentication chip and the mobile terminal have completed the authentication stage, the digital TV processor receives the digital TV signal from the RF receiving module. The digital TV signal is decoded, sent to the mobile terminal, and displayed on the mobile terminal. [Selection diagram] Fig. 2

Description

  The present invention relates to a digital television (TV) receiver, and more particularly, connected to the mobile terminal to convert a digital TV signal so that it can be displayed on the mobile terminal, and receives power from the mobile terminal. The present invention relates to a batteryless digital television receiver.

  In order to keep up with the spread of mobile terminals, peripheral devices linked to mobile terminals have become more diversified. In the background of the great response of Apple products such as iPone, iPad and iPod, peripheral devices for the above-mentioned mobile terminals are also rapidly developing and appearing on the market. A receiver that receives a digital TV signal and displays a digital TV program is one of the peripheral devices for the portable terminal described above. Such a receiver can be connected to a mobile phone or tablet personal computer (PC), the receiver receives so that a user can watch digital TV programs on the mobile phone or tablet PC, The decoded and encoded digital TV signal is sent to the mobile phone or tablet PC for playback by the mobile phone or tablet PC.

  However, since a digital TV receiver requires a battery for supplying operating power, it is relatively large and heavy, takes up a large space, and is inconvenient during transportation. Under such a background, if the digital TV receiver can obtain power from the portable terminal, the concern about portability is not a problem. However, mobile terminal manufacturers usually have strict specification requirements for peripheral devices. For example, Apple imposes strict operating current limits on peripheral devices, such as current output less than 100 mA. Therefore, conventional digital TV receivers are required to both improve portability and satisfy the specification requirements for peripheral devices required by portable terminal manufacturers.

  An object of the present invention is to receive a battery-less digital TV that receives operating power and a digital TV signal from a mobile terminal, decodes and encodes the digital TV signal, and sends the digital TV signal to the mobile terminal for playback. Is to provide a machine.

  In order to achieve the above object, the batteryless digital TV receiver includes a main body, a connector, an antenna port, a digital TV processor, an RF receiving module, an authentication chip, and a switching power conversion module.

  The connector is installed on the body and has a power input pin and a set of signal access pins.

  The antenna port is installed in the main body.

  The digital TV processor has at least one power input terminal, a set of signal access terminals, a set of authentication data access terminals, and a set of RF signal input terminals. The set of signal access terminals is connected to the set of signal access pins of the connector.

  The RF receiving module has at least one set of digital signal input terminals, at least one set of digital signal output terminals, and a power input terminal.

  The at least one set of digital signal input terminals is connected to the antenna port of the main body.

  The at least one set of digital signal output terminals are respectively connected to the at least one set of RF signal input terminals of the digital TV processor.

  The authentication chip has a set of authentication data access terminals and a power input terminal. The set of authentication data access terminals is connected to the set of authentication data access terminals of the digital TV processor.

  The switching power conversion module has at least one power input terminal and a plurality of output terminals. The at least one power input terminal is connected to the power input pin of the connector. The output terminal is connected to the power input terminal of the digital TV processor, the RF receiving module, and the power input terminal of the authentication chip. The digital TV processor, the RF receiving module, the authentication chip, and the switching power conversion module are installed in the main body.

  Since the switching power conversion module is designed based on a power switching technology, it has a higher voltage conversion efficiency. Furthermore, the converted voltage has better voltage stability. Therefore, the power loss is relatively low, which meets the restrictions of mobile terminals advertised for output current.

  Given a batteryless digital TV receiver, a user can plug the connector of the main body of the digital TV receiver into a portable terminal. The switching power conversion module receives the power output from the portable terminal through the connector, and outputs the power to the digital TV processor, the RF reception module, and the authentication chip for their operation. After obtaining the authentication approval from the mobile terminal through the authentication chip, the digital processor decodes and encodes the received digital TV signal, and displays the corresponding digital TV program by the mobile terminal. A digital TV signal is sent to the portable terminal. The above design allows the digital TV receiver to operate under the power specifications requirements of the mobile terminal.

1 is a perspective view of a batteryless digital TV receiver according to the present invention. It is a functional block diagram of the batteryless digital TV receiver of FIG. FIG. 3 is a first partial circuit diagram of the batteryless digital TV receiver of FIG. 2. FIG. 3 is a second partial circuit diagram of the batteryless digital TV receiver of FIG. 2. FIG. 4 is a third partial circuit diagram of the batteryless digital TV receiver of FIG. 2. FIG. 2 is a plan view of the batteryless digital TV receiver of FIG. 1 during operation.

  Referring to FIG. 1, a batteryless digital TV receiver according to the present invention includes a main body 10, a connector 11, and an antenna port 12. The connector 11 and the antenna port 12 are installed on the main body 10. The connector 11 has power input pins and a set of signal access pins. Referring to FIG. 2, the batteryless digital TV receiver further includes a digital TV processor 20, a radio frequency (RF) receiving module 30, an authentication chip 40, a memory 50, and switching power. A conversion module 60 is included.

  Referring to FIG. 3, an embodiment of the connector is shown on the right side. In this embodiment, the connector 11 is a 30-pin compatible with an input / output interface of an iPone of a smart mobile phone, an iPad of a tablet PC, and an iPod of a digital player (hereinafter referred to as a mobile terminal) manufactured by Apple. Related to connectors. Pin 8 of connector 11 is an output pin (5.0V), pin 13 is a power input pin (VCC 3.3V), and pins 4 and 6 correspond to a set of signal access pins. The power input pin (VCC 3.3 V) is connected to the switching power conversion module 60. When the batteryless digital TV receiver is connected to the portable terminal through the connector 11, a direct current of 3.3V is acquired from the portable terminal through the power input pin (VCC 3.3V).

  Referring to FIG. 4, the switching power conversion module 60 includes a first switching power converter 61 and a second switching power converter 62. The power input terminals (IN) of the first switching power converter 61 and the second switching power converter 62 are 1.8V DC power supplied to circuits and elements such as the digital TV processor 20 in the main body 10 and 1. In order to convert and generate 2V DC power, it is connected to the power input pin (VCC 3.3V) of the connector 11. Since the first switching power converter 61 and the second switching power converter 62 are controlled in output voltage by pulse width modulation (PWM), and the output voltage is adjusted by feedback, the operating current requirement is less than 100 mA. Strict specification requirements regarding output voltage (current) can be met.

  Still referring to FIG. 3, the digital TV processor 20 operates to convert a particular type of digital TV signal. In this embodiment, the digital TV processor 20 operates to process digital TV signals according to DVB-T and ISDB-T standards. The digital TV processor 20 has two sets of RF signal input terminals (UHFP, UHFN, VHFP, VHFN), a set of signal access terminals (USB_DN, USB_DP), and a set of authentication data access terminals (HGSCLK, HGSD). Two sets of RF signal input terminals (UHFP, UHFN, VHFP, VHFN) act to receive UHF (ultra high frequency) and VHF (ultra high frequency) digital TV signals. A set of signal access terminals (USB_DN, USB_DP) acts to send a digital TV signal to the portable terminal through the connector 11. A set of authentication data access terminals (HGSCLK, HGSD) is connected to the authentication chip 40 and the memory 50.

  Each of the authentication chip 40 and the memory 50 has a set of authentication data access terminals (HGSCLK, HGSD) and a power input terminal (VCC 3.3 V). A set of authentication data access terminals (HGSCLK, HGSD) is connected to the set of authentication data access terminals (HGSCLK, HGSD) of the digital TV processor 20. The power input terminal (VCC 3.3 V) is connected to the power input terminal (VCC 3.3 V) of the connector 11.

Referring to FIG. 5, the RF receiving module 30 includes two digital signal tuners 31 and 32 and two sets of matching passive elements. The input terminal UB of the digital signal tuner 31 is connected to the antenna port 12 through a set of matching inductors (L9, L10, L11) and capacitors (C56, C60). The input terminal UB of the digital signal tuner 32 is connected to the antenna port 12 through another set of matching inductors (L12, L14, L15) and capacitors (C53, C59). The digital signal tuners 31 and 32 each have a set of VHF output terminals (VHFP, VHFN) and a set of UHF output terminals (UHFP, UHFN). The set of VHF output terminals (VHFP, VHFN) is connected to the set of RF signal input terminals (VHFP, VHFN) of the digital TV processor 20.
One set of UHF output terminals (UHFP, UHFN) is connected to the other set of RF signal input terminals (UHFP, UHFN) of the digital TV processor 20.

  The UHF digital signal of the RF receiving module 30 is obtained by utilizing the resonance of a set of matching inductors (L9, L10, L11) and capacitors (C56, C60). The VHF digital signal of the RF receiver module 30 is obtained by utilizing the resonance of another set of matching inductors (L12, L14, L15) and capacitors (C49, C53, C59). The unstable signals of the UHF digital signal and the VHF digital signal are converted into stable signals by the digital signal tuners 31 and 32, respectively, and the stable signals are converted into two sets of RF signal input terminals (UHFP) of the digital signal processor 20. , UHFN, VHFP, and VHFN).

  Referring to FIG. 6, a connector 11 of the main body 10 of the digital TV receiver is electrically connected to a socket of a portable terminal, and an antenna port 12 of the digital TV receiver has an antenna capable of receiving digital signals. 121 is inserted. The operating voltage 3.3V for the portable terminal is obtained through the power input pin (VCC 3.3C) of the connector 11. The operating voltage 3.3V is further converted into an operating voltage (1.8V, 1.2V) for operating the digital TV processor 20 through the switching power conversion module 60. When the authentication chip 40 and the authentication data are stored to acquire the authentication approval issued from the portable terminal, the memory 50 stores the set of authentication data access terminals (HGSD, HGSCLK) and the set of signal access. The authentication data is transmitted to the mobile terminal through terminals (USB_DN, USB_DP). After the portable terminal sends the authentication approval, the two RF signal input terminals (UHFP, UHFN, VHFP, VHFN) of the digital TV processor 20 acquire the digital signal received from the antenna 121. The received digital signal is decoded and encoded into video data by the digital TV processor 20, and the video data is sent to the signal access pins 4 and 6 of the connector 11 through the set of signal access terminals (USB_DN, USB_DP). The mobile terminal is further sent to the mobile terminal for displaying video data.

  In the above design, after the batteryless digital TV receiver is connected to the portable terminal, the user can watch the digital TV program of the portable terminal. Meanwhile, the batteryless digital TV receiver can obtain operating power, which is about 97 mA and it meets stringent power requirements of less than 100 mA.

  Apple also states that the software is running after the digital TV receiver is plugged into the portable terminal but no software program is started or after the digital TV receiver is plugged into the portable terminal. Have other operational requirements related to the low power mode, such as a state where no digital TV program is displayed on the digital TV receiver. The operating requirements in the low power mode specify that the current consumption must be less than 10 mA. Therefore, in this embodiment, the communication interface between the digital TV receiver and the mobile terminal when the digital TV receiver is electrically connected to the mobile terminal is a general-purpose asynchronous transmission / reception circuit (UART) interface. The digital TV receiver can be switched to a low power mode through a UART interface and consumes less than 5 mA. When the mobile terminal software starts and a digital TV program is displayed on the mobile terminal, the digital TV receiver is switched to the normal power mode through the UART interface, and the current consumption is about 97 mA. Further, when the antenna 121 of the digital TV receiver fails to receive a digital TV signal or when the software of the mobile terminal is terminated, the digital TV receiver uses the UART interface to make power management more efficient. To switch to the low power mode.

  Referring further to FIG. 1, the main body 10 of the digital TV receiver further comprises an output port 13. According to further reference in FIG. 3, the output port 13 is a micro USB interface and has a power pin (VBUS). The power pin (VBUS) supplies DC power (USB 5.0V), and the digital TV processor 20 determines whether power is input from the output port 13 to charge the portable terminal. A charging signal (charging on) is provided to the digital TV processor 20.

  In the present embodiment, the power pin (VBUS) of the power port 13 is further connected to the protection module 70 in order to prevent overvoltage or overcurrent generated when power is output through the power port 13 from damaging the mobile terminal. To the power output terminal (5.0 V) of the connector 11. Further, referring to FIG. 4, the protection module 70 includes a detection device 71, an electronic switch 73, and a power supply device 72. The detection device 71 is connected to the power pin (VBUS) of the power port 13, and detects whether the DC power (USB 5.0V) input through the power port 13 exceeds either the rated voltage or the current, Used to determine whether the electronic switch 73 is switched on. In this embodiment, the electronic switch 73 is composed of an enhancement type NMOS (N-channel MOSFET), the gate of the enhancement type NMOS is connected to the output terminal of the detection device 71, and the drain of the NMOS is a power source. Connected to the enable / fault terminal of device 72. The power supply device 72 has an input terminal connected to the power pin (VBUS) of the power port 13 and an output terminal connected to the output pin of the connector 11, and DC power (USB 5. 0V), and the converted power is output to the connector 11 so that the portable terminal is charged through the connector 11. When the detection device 71 detects that the input DC power (USB 5.0V) is incomplete, the electronic switch 73 drops the voltage of the power pin (VBUS) of the power port 13 to ground. Otherwise, DC power (USB 5.0V) is output to the power supply device 72, and the power supply device 72 outputs a stable voltage to the output pin (5.0V) of the connector 11 in order to charge the portable terminal. To do. If a power source is available, the mobile terminal can be charged through the digital TV receiver to obtain sufficient power to display and operate the digital TV program.

DESCRIPTION OF SYMBOLS 10 Main body 11 Connector 12 Antenna port 13 Power port 20 Digital TV processor 30 RF receiving module 31, 32 Digital signal tuner 40 Authentication chip 50 Memory 60 Switching power conversion module 61, 62 Switching power converter 70 Protection module

Claims (10)

The body,
A power input terminal and a set of signal access pins, a connector installed in the body;
An antenna port installed in the main body;
At least one power input terminal; a set of signal access terminals connected to the set of signal access pins of the connector; a set of authentication data access terminals; and at least a set of radio frequency (RF) signal input terminals. A digital TV processor,
At least one set of digital signal input terminals connected to the antenna port of the main body, at least one set of digital signal output terminals respectively connected to the at least one set of RF signal input terminals of the digital TV processor, and a power input An RF receiver module having a terminal;
An authentication chip having a set of authentication data access terminals connected to the set of authentication data access terminals of the digital TV processor, and a power input terminal;
A switching having at least one power input terminal connected to the power input pin of the connector, and a plurality of power output terminals respectively connected to the power input terminals of the digital TV processor, the RF receiving module and the authentication chip Including a power conversion module,
The digital TV processor, RF receiving module, authentication chip and switching power conversion module are installed in the main body and are battery-less TV receivers.   The switching power conversion module includes a first switching power converter and a second switching power converter, and each of the first switching power converter and the second switching power converter is connected to a power input pin of the connector. The batteryless TV receiver according to claim 1, further comprising a power input terminal connected thereto. The RF receiving module includes:
Two digital signal tuners each having a set of ultra high frequency (VHF) output terminals and a set of ultra high frequency (UHF) output terminals;
With two sets of matching inductors and capacitors,
The batteryless TV receiver according to claim 2, wherein each digital signal tuner has an input terminal connected to the antenna port of the main body through a pair of the two matching inductors and capacitors.   The digital TV processor converts and generates digital TV signals, and also has two sets of RF signal input terminals, each of which receives the VHF and UHF digital TV signals, and the set of VHF output terminals and the one set. The batteryless digital TV receiver according to claim 3, comprising two sets of RF signal input terminals connected to the set of UHF output terminals.   5. The batteryless digital TV receiver according to claim 4, further comprising a memory installed in the main body and having a set of authentication data access terminals connected to the set of authentication data access terminals of the digital TV processor. Machine.   The battery-less digital TV receiver according to claim 5, wherein the digital TV receiver includes a universal asynchronous transmission / reception circuit (UART) interface compatible with a mobile terminal.   The battery according to claim 1, wherein the main body has a power port having power pins, and the connector has a power output pin connected to the power pins of the power port of the main body. Less digital TV receiver. The power output pin is connected to the power output pin of the connector through a protection module;
The protection module is
A power supply device having an input terminal connected to the power pin of the power port, an output terminal connected to the power output pin of the connector, and an enable terminal;
An electronic switch;
An output terminal, connected to the power pin of the power port, detects whether or not the DC power input through the power port exceeds a rated voltage, and the power supply device supplies power through the electronic switch The batteryless digital TV receiver according to claim 7, further comprising a detection device that determines whether or not to perform the detection.   The electronic switch is formed of an enhancement type NMOS (N-channel type MOSFET), the gate of the enhancement type NMOS is connected to the output terminal of the detection device, and the drain of the enhancement type NMOS is the power. The batteryless digital TV receiver according to claim 8, wherein the batteryless digital TV receiver is connected to the enable terminal of the supply device.   The batteryless digital TV receiver according to claim 7, wherein the power port is a micro USB interface.

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