WO2017050151A1

WO2017050151A1 - Function switching circuit and gateway type set top box

Info

Publication number: WO2017050151A1
Application number: PCT/CN2016/098821
Authority: WO
Inventors: 赵爱民
Original assignee: 深圳市九洲电器有限公司
Priority date: 2015-09-24
Filing date: 2016-09-13
Publication date: 2017-03-30
Also published as: CN105208438A; CN105208438B

Abstract

Disclosed are a function switching circuit for a gateway type set top box and a gateway type set top box. The function switching circuit comprises: a network interface for sending a network cable insertion state of a PC machine to a first trigger circuit; an HDMI interface for sending the state of a television to a second trigger circuit; the first trigger circuit for outputting different trigger signals of a modem to a judgement circuit according to the network cable insertion state of the PC machine; the second trigger circuit for outputting different trigger signals of the television to the judgement circuit according to the state of the television; the judgement circuit for judging whether the set top box enters a switching state according to a trigger signal of the television and a trigger signal of the modem; and a switching circuit for controlling the set top box whether to perform function switching according to a judgement result of the judgement circuit. The automatic switching between a television watching function and an Internet access function of the gateway type set top box can be realized, and the implementation is convenient, simple and effective.

Description

Title: Invention Name: Function Switching Circuit and Gateway Type Set Top Box

[0001] The present invention relates to the field of digital home technology, and in particular, to an automatic switching circuit for a high-definition home gateway type set top box function.

Background technique

[0002] In the process of using the HD home gateway type set-top box, the TV function and the Internet access function are usually not used together. However, the TV function and the Internet access function of the set-top box of the prior art often continue to work at the same time, which causes a huge waste of resources.

[0003] It is also possible to manually turn off the TV function or the Internet function of the set-top box without or without using 吋

However, this will cause inconvenience to the user.

technical problem

[0004] The present invention aims to overcome the defect that the TV function and the Internet access function cannot be automatically switched in the gateway type set top box of the prior art, and provides an automatic switching circuit for the high-definition home gateway type set top box function.

Problem solution

Technical solution

[0005] In order to solve the above technical problem, the present invention provides the following technical solutions:

[0006] In one aspect, the present invention provides a function switching circuit for a gateway type set top box, comprising: a network interface, connected between a modem of a set top box and a PC, for transmitting a network cable insertion state of the PC to the first The trigger circuit; the HDMI interface is connected between the set top box and the television, and is configured to send the state of the television to the second trigger circuit; the first trigger circuit, the input end is connected to the green power pin of the network interface, and the output terminal is connected to the judgment circuit. An input terminal is configured to output a modem trigger signal to the determining circuit according to the network cable insertion state of the PC; the second trigger circuit, the input end is connected to the hot plug detection pin of the HDMI interface, and the second input end of the output terminal connection judging circuit is used for The television trigger signal is output to the judging circuit according to the state of the television; the judging circuit is connected to the switching circuit for determining whether the set top box enters the switching state according to the trigger signal of the television and the trigger signal of the modem; Control whether the set-top box performs function according to the judgment result of the judgment circuit Change. In some embodiments, the first trigger circuit may include an N-channel enhancement type MOS transistor Q01, a diode D01, and a resistor R01, and a gate of the N-channel enhancement type MOS transistor Q01 serves as a first trigger circuit. The input terminal is connected to the green power supply pin of the network interface, the drain connection diode D01 cathode, and the source is grounded. The anode of the diode D01 is used as the output end of the first trigger circuit to connect the first input end of the judging circuit, and the end of the resistor R0 1 is connected. The anode of the diode D01 is connected to the power supply at the other end.

In some embodiments, the second trigger circuit may include a P-channel enhancement type MOS transistor Q02, a diode D 02, and a resistor R03, and a gate of the P-channel enhancement type MOS transistor Q02 serves as a second trigger circuit. The input end is connected to the hot plug detection pin of the HDMI interface, the cathode of the drain connection diode D02, and the source is grounded. The anode of the diode D02 is connected as the output end of the first trigger circuit to the first input end of the judging circuit, and the resistor R0 3 - The terminal is connected to the anode of the diode D02, and the other end is connected to the power supply.

In some embodiments, the determining circuit may be an AND circuit of two series-connected N-channel enhancement type MOS tubes and two parallel P-channel enhancement type MOS tubes, and two inputs of the AND gate circuit. The terminals are respectively connected to the output ends of the first trigger circuit and the second trigger circuit, and the output terminals are connected to the switching circuit.

[0010] In some embodiments, the switching circuit includes a transistor Q21, an N-channel enhancement MOS transistor Q20, and an inductor L1. The base of the transistor Q21 is connected to the output terminal, the emitter is grounded, and the source is connected to the N-channel. The gate of the channel enhancement type MOS transistor, the source of the N-channel enhancement type MOS transistor Q20 is connected to the DC/DC module, and the drain is connected to the modem through the inductor L1.

In another aspect, the present invention provides a gateway type set top box, the gateway type set top box including the function switching circuit of the present invention.

Advantageous effects of the invention

Beneficial effect

[0012] Compared with the prior art, the present invention has the following advantages: the first trigger circuit detects the network cable insertion state, and the standby trigger signal is issued, and the second trigger circuit detects the state of the television. The standby trigger signal is sent out, and the detection process is simple, convenient and effective. The judgment circuit determines whether the set-top box is switched by the two trigger signals, and realizes the automatic switching of the TV function and the Internet function of the home gateway type set-top box.

Brief description of the drawing

DRAWINGS 1 is a schematic structural diagram of a function switching circuit according to an embodiment of the present invention.

2 is a schematic diagram of a network interface status light in a function switching circuit according to an embodiment of the present invention.

3 is a schematic diagram of an HDMI interface in a function switching circuit according to an embodiment of the present invention.

4 is a schematic diagram of a first trigger circuit in a function switching circuit according to an embodiment of the present invention.

5 is a schematic diagram of a second trigger circuit in a function switching circuit according to an embodiment of the present invention.

6 is a schematic diagram of a determination circuit in a function switching circuit according to an embodiment of the present invention.

7 is a schematic diagram of a switching circuit in a function switching circuit according to an embodiment of the present invention.

8 is a flowchart of the operation of the function switching circuit according to an embodiment of the present invention.

Embodiments of the invention

[0021] In order to make the objects, technical solutions and advantages of the present invention more clear, the following is in conjunction with the accompanying drawings and embodiments.

The present invention will be further described in detail. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0022] As shown in FIG. 1, the high-definition home gateway type set top box function automatic switching circuit of the present invention includes

[0023] a network interface, connected between the set-top box (cable modem) and the PC, the same as the first trigger circuit, for transmitting the network cable insertion state of the PC to the first trigger circuit;

[0024] an HDMI interface, connected between the set top box and the television, and connected to the second trigger circuit for transmitting the state of the television to the second trigger circuit;

[0025] The first trigger circuit, the input end is connected to the green power pin of the network interface, and the first input end of the output connection determining circuit is configured to output different trigger signals of the modem to the determining circuit according to the network cable insertion state of the PC;

[0026] a second trigger circuit, the input end is connected to the hot plug detection pin of the HDMI interface, and the second end of the output end connection judging circuit; and is configured to output different trigger signals of the television to the judging circuit according to the state of the television;

[0027] a determining circuit, the output end is connected to the switching circuit, and configured to determine, according to the trigger signal of the television and the trigger signal of the modem, whether the set top box enters a switching state;

[0028] The switching circuit is connected to the modem of the set top box, and is configured to control whether the set top box performs function switching according to the judgment result of the determining circuit.

[0029] As shown in FIG. 2, which is a schematic diagram of a network interface status light, the 13-pin is a green light power supply, and the 14-pin is a green light control. Signal, 15 feet for orange light power, 16 feet for orange light orange light control signal.

[0030] When the PC network cable is plugged into the network interface, the network interface phy will have two lights: one is an orange light and the other is a green light. The green light is the indicator of the connection status, that is, the link light. In the normal state, when the network cable is connected, the status indicator is green and steady; the orange light is the signal transmission indicator, and the normal is non-stop. Blinking, indicating a signal transmission. The present invention detects the green light status to determine whether the user uses the network function.

[0031] As shown in FIG. 3, which is a schematic diagram of an HDMI (Digital High Definition Multimedia) interface, the 19th pin is a hot plug detection pin, and the present invention determines the state of the television set by detecting the level of the hot plug pin (working state or Standby/off state) to determine whether to enable the automatic switching function.

[0032] The negotiation process of the HDMI interface between the set-top box and the TV is as follows:

[0033] After the STB (set-top box) device is powered on, it will detect whether the HPD pin (hot plug detection pin) is pulled up to 2V or more (the main judgment basis). If yes, the set-top box device reads the EDID through DDC (Display data channel). The information determines the resolution that the TV can support; the same set-top box device detects whether the TMDS signal is pulled up to 3.3V, and then outputs the pull-up TMDS signal, and the set-top box device outputs the currently set resolution signal to the television.

As shown in FIG. 4, the first flip-flop circuit includes an N-channel enhancement type MOS transistor Q01, a diode D01, and a resistor R0 1, and the gate of the N-channel enhancement type MOS transistor Q01 serves as an input of the first flip-flop circuit. The green power supply pin of the end connection network interface, the cathode of the drain connection diode D01, and the source are grounded, and the anode of the diode D01 is connected as the output end of the first trigger circuit to the first input end of the judging circuit, and the resistor R01 is connected to the diode. Connect the anode to the other end. A resistor Rl l is further disposed between the gate of the N-channel enhancement type MOS transistor Q01 and the green signal signal pin connected to the network interface, and a resistor is disposed between the drain of the N-channel enhancement type MOS transistor Q01 and the cathode of the diode D01. R02, the drain of the N-channel enhancement type MOS transistor Q01 is also connected to the power source through the resistor R20.

[0035] The working principle of the first trigger circuit is: When the network cable with the PC is pulled out, the green power pin of the network interface, that is, the GREEN_LED pin is pulled to a low level, and the N connected to the green power pin is The channel enhancement type MOS transistor Q01 will be turned off, the A1 point is pulled to the high level, and the diode D01 is turned off, so that the output terminal CHECK_GREEN_LED of the first trigger circuit outputs a high level; otherwise, when the network cable of the PC is inserted, the GREE N_LED pin is High level, N-channel enhancement MOS transistor Q01 is turned on, diode D01 is also turned on, CHECK The _GREEN_LED terminal maintains a low level output. CHECK_GREEN_LED terminal low output 吋 description ca ble

The modem module works normally, waiting for the trigger signal. When a certain moment, the CHECK_GREEN_LED terminal changes from low level to high level, indicating that the network function is automatically turned off, that is, the high level is equivalent to the trigger signal of the network function being turned off. .

As shown in FIG. 5, the second flip-flop circuit includes a P-channel enhancement type MOS transistor Q02, a diode D02, and a resistor R0 3, and the gate of the P-channel enhancement type MOS transistor Q02 serves as an input of the second trigger circuit. The hot plug detection pin connected to the HDMI interface, the drain connection diode D02 cathode, and the source ground, the diode anode as the output end of the first trigger circuit is connected to the first input end of the judging circuit, and the resistor R03 is connected to the diode D02 anode, the other end is connected to the power supply. A resistor R05 is further disposed between the gate of the P-channel enhancement type MOS transistor Q02 and the green signal signal pin connected to the network interface, and a resistor is provided between the drain of the P-channel enhancement type MOS transistor Q02 and the cathode of the diode D 02. R04, the drain of P-channel enhancement MOS transistor Q02 is also connected to the power supply through resistor R06.

[0037] The working principle of the second trigger circuit is: When the television enters the standby or power-off state, the hot plug detection pin of the HDMI interface, that is, the HDMI_TX_HOTPLUG pin is pulled to a low level, and the P connected to the hot plug detection pin The channel enhancement type MOS transistor Q02 will be turned on, the B1 point is pulled to a low level, and the diode D02 is turned on, so that the second trigger circuit output terminal CHECK_HDMI outputs a low level; otherwise, when the television is in a working state, heat The plug detection pin is high, the P-channel enhancement MOS transistor Q02 is turned off, the diode D02 is also turned off, and the CHECK_HDMI terminal is kept high output. CHECK_HDMI high-level output 吋 indicates that the TV is working normally, waiting for the trigger signal, when a certain CHECK_HDMI terminal turns from high level to low level, it means the TV enters standby state or shuts down, that is, the low The level is equivalent to the trigger signal that the TV enters standby or is turned off.

[0038] As shown in FIG. 6, the judging circuit is an AND gate circuit composed of two N-channel enhancement type MOS transistors Q11 and Q10 connected in series and two parallel P-channel enhancement type MOS transistors Q13 and Q12. The two input ends are respectively connected to the output ends of the first trigger circuit and the second trigger circuit, and the output terminal is connected to the switching circuit. The gates of two parallel P-channel enhancement type MOS transistors Q13 and Q12 are respectively connected to the output ends of the first trigger circuit and the second trigger circuit, the input terminal of the drain connection modem, and the source ground, and the two series connection The gates of the N-channel enhancement type MOS transistors Q11 and Q10 are respectively connected to the input of the first trigger circuit and the second trigger circuit At the output, the source of the N-channel enhancement type MOS transistor Q10 is connected to the power supply, the drain is connected to the source of the N-channel enhancement type MOS transistor Q11, and the drain of the N-channel enhancement type MOS transistor Q11 is connected to the switching circuit.

[0039] In the above-mentioned AND circuit, when only one of the first input terminal CHECK_GREEN_LED and the second input terminal CHECK_HDMI is low level, the P-channel enhancement type MOS transistor connected thereto is turned on, and The N-channel enhancement type MOS transistor connected to it is turned off, and the output is low level; only when CHECK_HDMI, CHE CK_GREEN_LED are all high level, two parallel P-channel enhancement type MOS transistors Q12 and Q13 are both cut off, and two are connected in series. The N-channel enhancement type MOS transistors Q11 and Q10 are both turned on and the output is high. Outputting a high level or low level will cause the cable modem function module to be in a working state or in a standby state, thereby enabling the state of the function module to be switched. That is, the circuit is judged to enter the function switching state only when the television is operating and the network cable is pulled out to switch to the standby state.

[0040] The truth table is as follows:

[] [Table 1]

[0041] In the table:

[0042] 1. The status of CHECK_HDMI is 1 for the television to work;

[0043] 2. The state in which CHECK_GREEN_LED is 1 is to pull out the network cable;

[0044] 3. MODEM_TURNOFF is 1 for the cable modem to switch to the standby state, and 0 for the switch to the working state;

[0045] 4. When the network cable is inserted, it means that the user is using the network, and the cable modem needs to be in the working mode;

[0046] 5. When the TV down means that no user may use the network, the network signal is turned off;

[0047] 6. When the network cable is plugged in, and the TV is down, there may be a user using the network, and the cable Modem module is in a working state;

[0048] 7. When the network cable is plugged in, and the TV is in standby, there may be users using the network, and the cable modem module is required. In working condition;

[0049] 8. When the network cable is unplugged and the television is working, the user may not need the network, and the cable modem is in a standby state, that is, switched;

[0050] 9. When the network cable is unplugged and the television is in standby, there may be a user using the network, such as a WiFi AP, etc., and the cable Modem module is in a working state.

[0051] FIG. 7 is a schematic diagram of a switching circuit, including a transistor Q21, an N-channel enhancement type MOS transistor Q20, and an inductor L1. The base of the transistor Q21 is connected to the output terminal of the judgment circuit through the resistor R42, and the emitter is grounded. The source is connected to the gate of the N-channel enhancement type MOS transistor, the source of the N-channel enhancement type MOS transistor Q20 is connected to the DC/DC module, the drain is connected to the modem through the inductor L1, and the two ends of the inductor L1 are respectively grounded. Capacitor C35 and capacitor C36, a resistor R24 is provided between the source and the drain of the N-channel enhancement type MOS transistor, and a resistor R9 is provided between the source and the gate of the N-channel enhancement type MOS transistor.

[0052] When the MODEM_TURNOFF terminal is high level, the three-stage tube Q21 is turned on, the N-channel enhancement type MOS tube Q20 is turned off, the cable modem module network is cut off and enters the standby state; when the MODEM_TURNOFF is low level, the three-stage tube Q21 is cut off. The N-channel enhancement type MOS transistor Q20 is turned on, and the cable modem module enters a working state.

[0053] Under the premise that the MODEM_TURNOFF is high or low, the MODE M_TURNOFF is used to control the conduction and disconnection of +3.3V_CM and +3.3V_CABLEMODEM, thereby controlling the cable.

The modem module is in a working or standby state. +3.3V_CM is the external DC/DC power supply, and +3.3V_C ABLEMODEM is the power supply network for the cable modem.

[0054] That is, after the switching circuit inputs a high level or a low level, there are two result states: normal operation or standby

. The function module enters standby only when the TV is working and no network cable is plugged in.

[0055] The principle of the invention for starting the automatic switching function by the above switching circuit is as follows:

[0056] After the PC and the cable modem module on the set top box are disconnected, the cable modem automatically enters the standby state and turns off the network function; when the network cable is inserted, the cable modem module works normally, waiting for the trigger signal; the television enters After the standby state or shutdown, the Internet access module can be automatically activated. When the TV is working normally, the network function is automatically turned off. The circuit is in the ready state, waiting for the trigger signal. In summary, in accordance with the principles of the present invention, the circuit primarily determines the state of the television by hot plugging the level of the detected foot to determine whether to initiate the automatic switching function.

[0058] When the TV enters the standby state or is turned off, the circuit starts to work, as shown in Figure 8:

[0059] 1. The first trigger circuit detects the insertion condition (insertion or break) of the PC cable through the level of the green power pin, and outputs a different signal, and outputs a standby signal (low level/trigger signal) to the judgment. The circuit is inserted into the output signal (high level) to the decision circuit.

[0060] 2. The second trigger circuit detects the state of the television (working or standby) through the level of the HPD pin, outputs different signals, and standbys the output standby signal (low level/trigger signal) to the judgment circuit, and works 吋Output the working signal (high level) to the judgment circuit.

[0061] 3. The judging circuit jointly judges the state that the cable modem module should be in accordance with the received two input signals indicating the operation of the network module and the standby state (ie, standby or working):

[0062] 4. The switching circuit controls the power-on and power-off state of the cable modem according to the determination result, thereby causing the gateway module to automatically switch the state.

[0063] It can be seen that, in the switching circuit of the present invention, the first trigger circuit is used to detect the insertion state of the network cable, and the standby trigger signal is issued, and the state of the television is detected by the second trigger circuit, and the standby trigger is issued. Signal, the detection process is simple, convenient and effective. The judging circuit judges whether the set-top box enters and switches between the two trigger signals, thereby realizing automatic switching of the TV function and the Internet access function of the home gateway type set-top box, without manual operation by the user, and saving resources.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the present invention. Within the scope of protection of the invention.

Claims

Claim

[Claim 1] A function switching circuit for a gateway type set top box, characterized by:

a network interface, connected between the modem of the set top box and the PC, configured to send the network cable insertion state of the PC to the first trigger circuit;

An HDMI interface, connected between the set top box and the television, for transmitting the status of the television to the second trigger circuit;

a first trigger circuit, wherein the input end is connected to the green power pin of the network interface, and the first end of the output connection connection determining circuit is configured to output a modem trigger signal to the determining circuit according to the network cable insertion state of the PC;

a second trigger circuit, the input end is connected to the hot plug detection pin of the HDMI interface, and the output end is connected to the second input end of the judging circuit, and is configured to output a TV trigger signal to the judging circuit according to the state of the television;

a judging circuit, wherein the output end is connected to the switching circuit for determining whether the set top box enters the switching state according to the trigger signal of the television and the trigger signal of the modem;

The switching circuit is configured to control whether the set top box performs function switching according to the judgment result of the determining circuit.

[Claim 2] The function switching circuit according to claim 1, wherein: the first trigger circuit includes an N-channel enhancement type MOS transistor Q01, a diode D01, and a resistor R01, the N-channel enhancement type MOS The gate of the tube Q01 is connected to the green power supply pin of the network interface, the cathode of the drain connection diode D01, and the source is grounded as the input end of the first trigger circuit, and the anode of the diode DO1 is used as the output terminal connection judgment circuit of the first trigger circuit. The first input end, the resistor R01 is connected to the anode of the diode D01, and the other end is connected to the power source.

[Claim 3] The function switching circuit according to claim 1, wherein: the second trigger circuit includes a P-channel enhancement type MOS transistor Q02, a diode D02, and a resistor R03, and the P-channel enhancement type MOS The gate of the tube Q02 serves as an input end of the second trigger circuit, and is connected to the hot plug detection pin of the HDMI interface, the cathode of the drain connection diode D02, and the source is grounded. The anode of the diode D02 serves as an output terminal of the first trigger circuit. The first input end, the resistor R03 is connected to the anode of the diode D02, and the other end is connected to the power source.

[Claim 4] The function switching circuit according to claim 1, wherein: the determining circuit is composed of two N-channel enhancement type MOS transistors connected in series and two P-channel enhancement type MOS transistors connected in parallel. The AND circuit, the two input ends of the AND circuit are respectively connected to the output ends of the first trigger circuit and the second trigger circuit, and the output terminal is connected to the switching circuit.

[Claim 5] The function switching circuit according to claim 1, wherein: the switching circuit includes a transistor Q21, an N-channel enhancement type MOS transistor Q20, and an inductor L01, and a base connection judging circuit of the transistor Q21 The output terminal and the emitter are grounded, and the source is connected to the gate of the N-channel enhancement type M OS tube. The source of the N-channel enhancement type MOS transistor Q20 is connected to the DC/DC module, and the drain is connected to the modem through the inductor L01.

[Claim 6] A gateway type set top box, wherein the gateway type set top box includes the following claims

The function switching circuit of any of 1-5.