CN215452532U - Set top box with PD quick charging function - Google Patents

Abstract

The utility model relates to the technical field of digital set-top boxes, and particularly discloses a set-top box with a PD (potential difference) quick charging function, which comprises a host, a switch power supply, a charging circuit and a quick charging interface, wherein the switch power supply is electrically connected with the host and supplies power to the host, the charging circuit is electrically connected with the host and is controlled by the host to access voltage from the switch power supply, and the quick charging interface is electrically connected with the charging circuit and is used for charging external electronic products; the charging circuit comprises a power supply power control chip which is connected with the switching power supply and is used for quick charging, and an identification control chip which is compatible with a PD quick charging protocol and is used for identifying a charging port of an external electronic product; after the type of the electronic product charging port is identified by the identification control chip, current or voltage with preset magnitude is distributed to the electronic product charging port and charging is carried out. The set top box provides the PD quick charging function, when the set top box works normally, a user can charge the electronic product through the quick charging interface of the set top box without a charging head, and the charging convenience of the electronic product is improved.

Description

Set top box with PD quick charging function

Technical Field

The utility model relates to the technical field of digital set-top boxes, in particular to a set-top box with a PD quick charging function.

Background

Currently, more and more portable electronic products enter people's home and office activities, the portable electronic products often need to prolong battery life by charging, and most portable electronic products support PD fast charging (USB Power Delivery, a standard for fast charging released by the standardization organization of USB) to shorten charging time. However, the charging head of the conventional portable electronic product is small in size and is easy to lose or be omitted when being carried; due to the frequent use of the charging head, when the charging head is pulled out from the charging seat, the cable in the charging head is pulled easily, so that the circuit is disconnected, the charging head is easy to damage, and the service life is short; furthermore, some electronic products, such as bluetooth headsets and IPHONE12 mobile phones, are not equipped with a charging head when leaving the factory, which makes timely and effective charging of the portable electronic product difficult to guarantee, and is not beneficial to prolonging the endurance time of the electronic product.

The digital set-top box is a device which receives television program signals by using modes such as a cable, a satellite antenna, a terrestrial broadcast, a broadband network and the like and puts the television program signals on an external display device for watching. Due to the particularity that the set-top box has small change of the set-top box position, how to provide a charging port of an electronic product on the set-top box to reduce the charging difficulty of the electronic product becomes a new direction for the development of the current digital set-top box.

SUMMERY OF THE UTILITY MODEL

Therefore, the set top box with the PD quick charging function is needed to solve the technical problems that a charging head of an electronic product is easy to lose, damage or omit and the electronic product is not favorable for timely charging.

A set-top box with a PD quick charging function comprises a host, a switching power supply, a charging circuit and a quick charging interface, wherein the switching power supply is electrically connected with the host and supplies power to the host, the charging circuit is electrically connected with the host and accesses voltage from the switching power supply under the control of the host, and the quick charging interface is electrically connected with the charging circuit and is used for charging an external electronic product;

the charging circuit comprises a power supply power control chip which is connected with the switching power supply and is used for quick charging, and an identification control chip which is compatible with a PD quick charging protocol and is used for identifying a charging port of an external electronic product; after the identification control chip identifies the type of the electronic product charging port, current or voltage with preset magnitude is distributed to the electronic product charging port and charging is carried out.

In one embodiment, the charging circuit further comprises a sampling circuit for collecting an electrical signal from the fast charging interface, and a voltage stabilizing circuit for adjusting the voltage output by the sampling circuit and outputting the voltage to the power control chip.

In one embodiment, the model of the power supply power control chip is Mx6590, and the model of the identification control chip is Mx 5480.

In one embodiment, the PD rapid charging protocol compatible with the identification control chip comprises USB-PD3.0, QC3.0/2.0, FCP, AFC, MTK, PE + Apple2.4A and BC 1.2.

In one embodiment, the switching power supply comprises an AC input interface, an EMI circuit for performing electromagnetic interference prevention processing on alternating current accessed by the AC input interface, a rectification filter circuit for performing rectification filtering, a transformer, and a DC output port connected with the transformer, which are connected in sequence, and the DC output port is electrically connected with the host.

In one embodiment, the host comprises a main chip for data processing, a signal receiving module for accessing a television program signal to the main chip, an instruction receiving module for receiving a control instruction and sending the control instruction to the main chip, and an audio output module and a video output module which are respectively electrically connected with the main chip.

In one embodiment, the signal receiving module comprises a tuner which accesses television program signals through a front-end cable, a satellite antenna and a terrestrial broadcast; and the demodulator is used for demodulating and demultiplexing the intermediate frequency signal accessed by the high frequency head and outputting TS (transport stream) to the main chip.

In one embodiment, the instruction receiving module includes a USB interface, a remote control signal interface, and a key interface electrically connected to the main chip.

In one embodiment, the host further comprises an HDMI output interface and an Rj45 interface electrically connected to the main chip respectively, and the main chip is connected to an external device through the HDMI output interface or/and the Rj45 interface.

In one embodiment, the quick charging interface is a Type-C interface or a USB-A interface.

According to the set top box with the PD quick charging function, the charging circuit and the quick charging interface are additionally arranged on the basis of the switching power supply, when an electronic product supporting the PD quick charging is required to be charged, the electronic product can be matched and connected with the quick charging interface only by ensuring that the set top box is in a working state, and after the type of the charging port of the electronic product is identified, the identification control chip distributes current or voltage with a preset size to the charging port of the electronic product, so that the electronic product is charged, a user can charge the electronic product without a charging head, and the convenience of charging the electronic product is improved.

Drawings

FIG. 1 is a schematic diagram of a set-top box according to an embodiment of the present invention;

FIG. 2 is a diagram of the connection between the switching power supply and the charging circuit according to an embodiment of the present invention;

FIG. 3 is a circuit schematic of a charging circuit in an embodiment of the utility model;

FIG. 4 is a circuit schematic of a switching power supply in an embodiment of the utility model;

FIG. 5 is a diagram of an application scenario for a set-top box in an embodiment of the present invention;

fig. 6 is a schematic block diagram of a host according to an embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

The set-top box generally comprises two power supply modes, wherein one mode is that power is supplied through an external adapter, and DC 5V/2A or 12V/1A is output through the adapter to supply power to the set-top box; in the case of a satellite set-top box, the output DC12V/2A powers the set-top box. The other is to supply power through the inside (the switching power supply 200 is integrated in the device), and the switching power supply 200 converts the input AC 100 and 240V voltage into 5V/2A or 12V/1A to supply power to the set-top box. The set-top box provided by the utility model is based on the latter, namely based on the improvement of the set-top box internally provided with the switching power supply 200, the charging circuit 300 is connected with the switching power supply 200, the switching power supply 200 supplies power normally in the working process of the set-top box, and meanwhile, the charging circuit 300 is connected with voltage by the switching power supply 200 and provides electric energy for an external electronic product to be charged, so that a user can charge the electronic equipment by using the set-top box in the place of the set-top box without finding a charging head, and the convenience of charging the electronic product is improved.

Referring to fig. 1, the present invention provides a set-top box 10 with a PD fast charging function, which includes a host 100, a switching power supply 200 electrically connected to the host 100 and supplying power to the host 100, a charging circuit 300 electrically connected to the host 100 and receiving voltage from the switching power supply 200 under the control of the host 100, and a fast charging interface 400 electrically connected to the charging circuit 300 and used for charging external electronic products; the charging circuit 300 comprises a power supply power control chip 310 connected with the switching power supply 200 and used for quick charging, and an identification control chip 320 compatible with a PD quick charging protocol and used for identifying a charging port of an external electronic product; after the identification control chip 320 identifies the type of the electronic product charging port, a current or a voltage of a predetermined magnitude is distributed to the electronic product charging port and charging is performed. Preferably, the quick charging interface 400 is a Type-C interface or a USB-a interface.

Further, the model of the power control chip 310 is Mx6590, the model of the identification control chip 320 is Mx5480, and the Mx6590 chip and the Mx5480 chip together form the charging circuit 300 of the present embodiment, which can provide 20W power. The Mx6590 chip integrates a 700V high-voltage power MOS into an SOP-7 packaged chip, a power device and a PWM controller are arranged in the tiny SOP-7 packaged chip, 20W rated power can be output under the condition of no heat sink and wide voltage, and the power control chip 310 is excellent in performance. The Mx5480 chip is a secondary chip integrating three functions of a synchronous rectification controller, a synchronous rectification MOS tube and multi-protocol processing, is compatible with all protocols supported by a Type-C interface and a USB-A interface, and identifies PD fast charging protocols compatible with the control chip 320, wherein the PD fast charging protocols comprise USB-PD3.0, QC3.0/2.0, FCP, AFC, MTK, PE + Apple2.4A and BC 1.2; in addition, the Mx5480 chip is matched with MX6590 through a proprietary secondary-to-primary intelligent feedback technology, so that the output voltage is adjustable in 200mV steps from 3.6V to 20V. Fixed voltage outputs may also be provided, such as: the actual output voltage is determined by the request of the mobile device, so that the voltage and power parameters output to the quick charging interface 400 are controlled, the charging voltage and power are respectively adapted to the rated voltage and rated power of the electronic product, and the charging safety of the electronic product is improved.

Referring to fig. 2 to 4, in an embodiment, the charging circuit 300 further includes a sampling circuit for collecting an electrical signal from the fast charging interface 400, and a voltage regulator circuit for regulating a voltage output by the sampling circuit and outputting the regulated voltage to the power control chip 310, so as to avoid a signal identification error problem caused by oscillation during voltage collection, thereby improving reliability of signal collection. In this embodiment, the Mx6590 chip is connected to the switching power supply 200 through the HV node, and meanwhile, the Mx6590 chip is coupled to the Mx5480 chip through the T4 transformer, and in the fast charging interface 400, that is, the J44 shown in fig. 3 is a TYPE-C interface, which is a port for connecting to an external electronic device. The USB-VCC node in fig. 3, namely the charging voltage output by the USB, the TC _ DP, the TC _ DN, the TC _ CC1, and the TC _ CC2 form a communication interface, which performs communication after being switched over with an external electronic device, and determines the charging voltage and current, the MX5480 chip receives the charging information and performs operation, and outputs a control voltage to the MX6590 chip, and the MX6590 chip correspondingly changes the switching frequency according to the received control voltage, and outputs the power supply voltage and current required by the fast charging interface 400 in real time after being coupled by the T4 transformer and rectified by the MX 5480. In the working process of the charging circuit 300, an Mx6590 chip is connected with high voltage from the output end of the switching power supply 200 through an HV node, the connected high voltage provides starting voltage for an MX6590 chip through R188 and R189, and enters the MX6590 chip through T4, after the MX6590 chip normally works, rectification of a diode D17 is performed, filtering is performed through C152, power is supplied to the MX6590 chip, a T4 transformer continuously works, the voltage of an auxiliary winding is fed back and stably output through series resistors of R88 and R89, and the resistor R90 is used for setting the maximum output current; MX5480 communicates with external electronic products through D +, D-or CC1, CC2, detects the charging voltage required by the external electronic products in real time, and feeds back the charging voltage to Mx6590 through Q13 and LED4 photocoupler after internal processing, and the Mx6590 chip adjusts the output switching frequency, so that the voltage output by the switching transformer T4 is matched with the charging voltage of the electronic products.

After the Mx6590 chip performs primary processing on the voltage, the Mx6590 chip couples and transfers a voltage signal to the Mx5480 chip through a T4 transformer, the Mx5480 chip performs rectification and filtering through C133 and C151, and Q12 controls whether a charging voltage is output or not. Because the Mx5480 chip is compatible with a plurality of fast charging protocols, a standard charging voltage value and a standard charging power value are preset in the Mx5480 chip for each fast charging protocol, and a pin 6, a pin 7, a pin 8 and a pin 9 of the Mx5480 chip are respectively connected with a pin B5, a pin a5, a pin a6 and a pin a7 of TYPE-C J44 correspondingly. In the working process of the set-top box, when an external electronic product is connected to the quick charging interface 400, the pin B5, the pin a5, the pin a6 and the pin a7 of the TYPE-C J44 communicate with the external electronic product (that is, the pin 6, the pin 7, the pin 8 and the pin 9 of the Mx5480 chip communicate with the external electronic product), the Mx5480 chip performs protocol recognition with a charging port plugged in the quick charging interface 400 to obtain charging voltage and current required by the operation of the electronic product, then, the voltage output by the pin 10 of the Mx5480 chip is adjusted to make the change of the LED4, the change of the light-emitting brightness of the LED4 is converted into the change of an electric signal through the Q3 and fed back to the Mx6590, the Mx6590 changes the switching frequency, the pin 6, 7 and the pin 8, 9, 10 of the transformer T4 output a proper voltage waveform, the charging voltage and current are rectified by the Mx5480 to output the charging voltage and current, the voltage transmitted to the quick charging interface 400 is changed to be suitable for the charging condition of the electronic product.

Referring to fig. 2 and 4, the switching power supply 200 includes an AC input interface, an EMI circuit for performing electromagnetic interference prevention processing on the AC power accessed by the AC input interface, a rectifying and filtering circuit for performing rectifying and filtering, a transformer, and a DC output port connected to the transformer, and the DC output port is electrically connected to the host 100 and is used for supplying power to the host 100. The switching power supply 200 further comprises a power chip with the model number of PN8368, when external alternating current is accessed to the switching power supply 200, firstly, high-frequency noise interference is filtered from the alternating current, then, pi filtering is formed by bridge stack BD1 rectification and common mode inductor L21 and capacitors C150 and C114, so that the alternating current with periodic change is converted into direct current, the converted direct current is sent to the charging circuit 300 through one part, and the other part directly outputs 5V voltage through a transformer with the model number of HY-EE16T1340 to supply power to the host 100, so as to ensure normal operation of the set-top box.

The main unit 100 is accommodated in an inner cavity of a housing of the set-top box, and is configured to provide basic functions of the set-top box, that is, to receive a television program signal, process the television program signal, and transmit the television program signal to an external display device, such as a television or an electronic display screen. Specifically, referring to fig. 6, the host 100 includes a main chip 110 for data processing, a signal receiving module 120 for accessing a television program signal to the main chip 110, an instruction receiving module 130 for receiving a control instruction and sending the control instruction to the main chip 110, and an audio output module 140 and a video output module 150 respectively connected to the main chip 110. Further, in an embodiment, the signal receiving module 120 includes a tuner 121 for accessing television program signals through a front-end cable, a satellite antenna, and a terrestrial broadcast; and a demodulator 122 for demodulating and demultiplexing the intermediate frequency signal accessed by the tuner 121, and outputting a TS stream to the main chip 110. Referring to fig. 1 and 5, in the working process of the set-top box, the tuner 121 receives a radio frequency signal from a front end through a receiving method such as a cable, a satellite antenna, and a terrestrial broadcast, performs down-conversion to an intermediate frequency signal, performs filtering and amplification processing on the intermediate frequency signal by the tuner 121, and transmits the intermediate frequency signal to the demodulator 122 for analog-to-digital conversion and demultiplexing processing, and finally outputs a TS stream (also called a transport stream) signal to the main chip 110, where the main chip 110 is also called a CPU, and the CPU decodes the TS stream signal, and the decoded audio and video signals are output through the audio output module 140 and the video output module 150, and are played on a corresponding external playing device.

In one embodiment, the audio output module 140 is an audio DAC, i.e., an audio digital-to-analog converter, for converting a digital audio signal into an analog audio signal to be output, the video output module 150 is a video DAC, i.e., a video digital-to-analog converter, for converting and outputting a CVBS signal, and the audio signal decoded by the main chip 110 can also be directly output in the form of digital audio. Further, the host 100 further includes a dynamic random access memory DDR160 and a FLASH memory FLASH170 for performing data interaction with the main chip 110, so as to increase the operation speed of the host 100 and improve the operational capability of the host 100.

In one embodiment, the command receiving module 130 includes a USB interface 131, a remote control signal interface 132 and a key interface 133 electrically connected to the main chip 110. That is, the main chip 110 may be connected to an external electronic device through the USB interface 131, connected to an external remote control device through the remote control signal receiving interface 132, or directly input a control command through a key connected to the key interface 133, so as to meet various different operation requirements of a user, thereby reducing the control difficulty of the set-top box.

Further, the host 100 further includes an HDMI output interface 180 and an Rj45 interface 190 electrically connected to the main chip 110, respectively, and the main chip 110 is connected to an external device through the HDMI output interface 180 or/and the Rj45 interface 190. The HDMI output interface 180 applies a digital video/Audio interface technology, is a special digital interface suitable for video transmission, can simultaneously transmit Audio and video signals, has the highest data transmission speed of 2.25GB/s, does not need line/analog or analog/digital conversion before signal transmission, meets the resolution of 1080P, can also support digital Audio formats such as DVD Audio and the like, supports eight-channel 96kHz or stereo 192kHz digital Audio transmission, can transmit uncompressed Audio signals and video signals, and avoids the problem of quality reduction of television program signals in the transmission process. The Rj45 interface 190 is generally used for data transmission, and may be used to plug a network cable so as to directly load the tv program signal from the background server or the cloud to the main chip 110 for processing.

According to the set top box 10 with the PD quick charging function, the charging circuit 300 and the quick charging interface 400 are additionally arranged on the basis of the switching power supply 200, when an electronic product supporting the PD quick charging is required to be charged, the electronic product can be connected with the quick charging interface 400 in a matching way only by ensuring that the set top box is in a working state, and after the type of the charging port of the electronic product is identified, the identification control chip 320 distributes current or voltage with a preset size to the charging port of the electronic product, so that the electronic product is charged, a user can charge the electronic product without a charging head, and the convenience of charging the electronic product is improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A set-top box with a PD quick charging function is characterized by comprising a host, a switching power supply, a charging circuit and a quick charging interface, wherein the switching power supply is electrically connected with the host and supplies power to the host, the charging circuit is electrically connected with the host and accesses voltage from the switching power supply under the control of the host, and the quick charging interface is electrically connected with the charging circuit and is used for charging external electronic products;

the charging circuit comprises a power supply power control chip which is connected with the switching power supply and is used for quick charging, and an identification control chip which is compatible with a PD quick charging protocol and is used for identifying a charging port of an external electronic product; after the identification control chip identifies the type of the electronic product charging port, current or voltage with preset magnitude is distributed to the electronic product charging port and charging is carried out.

2. The set top box with the PD fast-charging function according to claim 1, wherein the charging circuit further includes a sampling circuit for collecting electrical signals from the fast-charging interface, and a voltage regulator circuit for regulating the voltage output by the sampling circuit and outputting to the power control chip.

3. The set top box with the PD fast charging function of claim 2, wherein the model of the power supply power control chip is Mx6590, and the model of the identification control chip is Mx 5480.

4. The set top box with the PD fast charging function according to claim 3, characterized in that the PD fast charging protocol compatible with the identification control chip includes USB-PD3.0, QC3.0/2.0, FCP, AFC, MTK, PE + Apple2.4A and BC 1.2.

5. The set top box with the PD fast charging function of claim 4, wherein the switching power supply comprises an AC input interface, an EMI circuit for performing electromagnetic interference prevention processing on the AC power accessed by the AC input interface, a rectifying and filtering circuit for performing rectifying and filtering, a transformer, and a DC output port connected to the transformer, which are connected in sequence, and the DC output port is electrically connected to the host.

6. The set top box with the PD fast-charging function according to claim 5, wherein the host includes a main chip for data processing, a signal receiving module for accessing a television program signal to the main chip, an instruction receiving module for receiving a control instruction and sending the control instruction to the main chip, and an audio output module and a video output module electrically connected to the main chip, respectively.

7. The set top box with the PD fast charging function of claim 6, wherein said signal receiving module comprises a tuner for accessing television program signals via front-end cable, satellite antenna, and terrestrial broadcast; and the demodulator is used for demodulating and demultiplexing the intermediate frequency signal accessed by the high frequency head and outputting TS (transport stream) to the main chip.

8. The set top box with the PD fast charging function according to claim 7, wherein the command receiving module includes a USB interface, a remote control signal interface and a key interface electrically connected to the main chip respectively.

9. The set top box with the PD fast charging function of claim 8, wherein the host further includes an HDMI output interface and an Rj45 interface electrically connected to the main chip, respectively, and the main chip is connected to an external device through the HDMI output interface or/and the Rj45 interface.

10. The set top box with the PD fast charging function of claim 9, wherein the fast charging interface is a Type-C interface or a USB-a interface.

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