DP to HDMI system with wake-up function
By introducing voltage control circuits and conversion chips into the DP to HDMI system, the problem that existing systems cannot realize the wake-up function on displays, TVs and other devices is solved, and the effect of quickly waking up the device when accessing signals and reducing standby power consumption is achieved.
Patent Information
- Application Number
- CN202421073374.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-16
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-05-16
AI Technical Summary
The existing DP signal to HDMI signal system cannot realize the wake-up function on displays, TVs and other devices, especially in situations where standby power consumption is required.
A DP to HDMI system including a conversion chip and a voltage control circuit is designed. The conversion chip converts the DP signal to an HDMI signal and provides a controllable voltage input to the main control chip through the voltage control circuit, thereby achieving a wake-up function.
It realizes the function of waking up devices such as monitors or TVs when accessing signals, ensuring that the system can respond quickly in standby state and reduce standby power consumption.
Smart Images
Figure CN222674389U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of electrical equipment with DP interface input, such as televisions and displays, and in particular to a DP to HDMI system with a wake-up function. Background Art
[0002] The existing DP signal to HDMI signal system can only achieve simple signal conversion, that is, when the access signal is a DP signal, the conversion chip converts the DP protocol signal into an HDMI protocol signal, so that devices with HDMI signal receiving capabilities can also support DP input. Most of the above designs are used for devices such as port converters and TYPE-C expansion docks. Such devices usually do not need to have the function of waking up the receiving host when a signal is connected. However, when applied to devices such as monitors and TVs that have requirements for standby power consumption, the inability of the signal conversion system to achieve the wake-up function becomes a problem that needs to be solved urgently. Utility Model Content
[0003] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a DP to HDMI system with a wake-up function.
[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0005] A DP to HDMI system with a wake-up function comprises a conversion chip, which is connected between a DP signal output device and a main control chip of an HDMI signal receiving device, and converts a DP signal into an HDMI signal and then inputs the HDMI signal into the main control chip; and also comprises a voltage control circuit, which comprises a triode, a MOS tube, a first resistor, a second resistor and a third resistor, wherein the base of the triode is connected to one end of the first resistor, the emitter of the triode is grounded, the collector of the triode is respectively connected to one end of the second resistor and one end of the third resistor, the gate of the MOS tube is connected to the other end of the third resistor, the drain of the MOS tube and the other end of the second resistor are both connected to a voltage source, the other end of the first resistor is connected to the output pin of the conversion chip, and the source of the MOS tube is connected to the power pin of the main control chip; the input pin of the conversion chip is connected to the AUX auxiliary pin of the DP signal output device, and the hot-swap pin of the conversion chip is connected to the hot-swap pin of the main control chip.
[0006] Optionally, the integrated circuit bus pin of the conversion chip is connected to the integrated circuit bus pin of the main control chip.
[0007] Optionally, a capacitor is connected between the AUX auxiliary pin of the conversion chip and the AUX auxiliary pin of the DP signal output device.
[0008] Optionally, the voltage of the voltage source is the same as the power supply voltage of the main control chip.
[0009] The beneficial effect of the utility model is that by setting a voltage control circuit and connecting the conversion chip with the DP signal output device and the main control chip, a controllable voltage input is provided to the main control chip, thereby controlling the working state of the system and realizing the wake-up function. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 Shown is a circuit diagram of a DP to HDMI system with a wake-up function according to an embodiment of the present invention. DETAILED DESCRIPTION
[0011] In order to more clearly understand the technical content, achieved purposes and effects of the utility model, the utility model is described in detail below in combination with specific implementation methods and in conjunction with the accompanying drawings. It should be noted that the implementation methods of the utility model and the features in the implementation methods can be combined with each other without conflict. In the following description, many specific details are set forth in order to fully understand the utility model. The implementation methods described are only part of the implementation methods of the utility model, not all of the implementation methods. Based on the implementation methods in the utility model, all other implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0012] Please refer to Figure 1 As shown, the embodiment of the utility model provides a DP to HDMI system with a wake-up function, including a conversion chip, which is connected between the DP signal output device and the main control chip of the HDMI signal receiving device, and converts the DP signal into an HDMI signal and then inputs it into the main control chip. The conversion chip can be an existing chip that can convert a DP data signal into an HDMI data signal, such as a chip with a model of PS196, a chip with a model of CS5263AN, a chip with a model of LT8711UXC_U1, etc. The DP signal output device is a device that provides DP audio and video signals, which can be a computer host, a signal generator, etc. The conversion chip is connected to the DP signal output device through a DP cable. The HDMI signal receiving device is a display, a television, etc., and the main control chip is the main control unit of the HDMI signal receiving device, which can receive HDMI protocol signals, realize power on, power off, standby control, demodulate HDMI audio and video signals, and other functions. It should be noted that the functions of the aforementioned main control chip are the mainstream functions of the main control chips of existing displays, televisions, etc.
[0013] The DP to HDMI system with wake-up function also includes a voltage control circuit, which includes a transistor Q1, a MOS transistor Q2, a resistor R1, a resistor R2 and a resistor R3. The base of the transistor Q1 is connected to one end of the resistor R1, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is respectively connected to one end of the resistor R2 and one end of the resistor R3, the gate of the MOS transistor Q2 is connected to the other end of the resistor R3, the drain of the MOS transistor Q2 and the other end of the resistor R2 are both connected to a voltage source, the other end of the resistor R1 is connected to the output pin GPIO_OUT of the conversion chip, and the source of the MOS transistor Q2 is connected to the power pin HDMI_5V of the main control chip. The transistor Q1 is an NPN transistor, and the MOS transistor Q2 is an N-channel MOS transistor. The voltage of the voltage source is the same as the power supply voltage of the main control chip. In a specific setting, the voltage of the voltage source is 5V. The two ends of the resistor R1 are respectively connected to the pin GPIO_OUT of the conversion chip and the base of the transistor Q1, which plays a role in current limiting. The other end of the resistor R2 is connected to 5V_IN, i.e., a 5V voltage source input. The drain of the MOS tube Q2 is also connected to 5V_IN, and the source is connected to the output 5V_OUT, which acts as a 5V power switch. The 5V_OUT is connected to the power pin HDMI_5V of the main control chip.
[0014] The input pin GPIO_IN of the conversion chip is connected to the AUX auxiliary pin AUX- of the DP signal output device, and the hot plug pin Hot plug of the conversion chip is connected to the hot plug pin Hot plug of the main control chip. The integrated circuit bus pin IIC of the conversion chip is connected to the integrated circuit bus pin IIC of the main control chip. A capacitor is connected between the AUX auxiliary pin of the conversion chip and the AUX auxiliary pin AUX- of the DP signal output device. Figure 1 As shown, the arrow indicates the transmission direction of the electrical signal.
[0015] The following is an explanation of the working principle of the above-mentioned DP to HDMI system with wake-up function. Before the specific description, the meaning of the key words is explained first:
[0016] Standby: When the device has no signal or has not been operated for a long time, the system will automatically shut down other power-consuming modules and enter a state where low-power modules are ready to be woken up at any time.
[0017] Shutdown: refers to shutting down the system and maintaining the lowest power consumption state. At this time, the system can only be turned on through the corresponding power button or remote control.
[0018] Input device: refers to the module composed of conversion chip, voltage control circuit and main control chip.
[0019] The working principle of the above DP to HDMI system with wake-up function is as follows:
[0020] (1) When the input device is in working state, the DP signal output device outputs the DP signal to the input device. The conversion chip receives the signal and performs the DP handshake protocol, and then converts the DP signal into an HDMI signal to be output to the main control chip. According to the DP protocol, when there is no DP signal input at the input end, the pin AUX- is low level. When the DP signal output device outputs the DP signal, the pin AUX- will be pulled high. At this time, the pin GPIO IN of the conversion chip will receive a high level signal, and then the conversion chip will output a high level through the pin GPIO OUT, which is given to the base of the transistor Q1 through the resistor R1. The transistor Q1 is turned on, and the gate of the MOS tube Q2 is pulled low. At this time, the MOS tube Q2 is turned on, and the 5V_IN voltage flows to 5V_OUT through the MOS tube Q2, and 5V_OUT is connected to the pin HDMI_5V of the main control chip. According to the HDMI handshake protocol, when the main control chip receives a 5V input, the main control chip pulls up the voltage of the hot plug pin. At this time, the conversion chip and the main control chip communicate through the IIC protocol. After the two parties shake hands, the conversion chip sends the HDMI signal to the main control chip, and the main control chip demodulates the received HDMI signal into a display signal and sends it to the monitor screen for display.
[0021] (2) When the input device is in standby mode, both the conversion chip and the main control chip enter low power consumption mode and wait to be awakened. When the conversion chip receives a DP signal input, the GPIO_IN pin receives a high level, the conversion chip pulls up the level of the GPIO_OUT pin, the voltage control circuit works, and the transistor Q2 is turned on to transmit the 5V voltage to the HDMI_5V pin of the main control chip. When the main control chip receives the 5V voltage signal, the main control chip will be awakened, that is, the system will be awakened. The main control chip pulls up the level of the hot plug pin. When the conversion chip receives the high level input from the hot plug pin, it wakes up the conversion chip and performs signal conversion. Then the HDMI signal is output to the main control chip, realizing the function of waking up the device when the signal is connected and making the device work normally.
[0022] (3) When the input device is in standby mode, and the DP data signal output by the DP signal output device is abnormal or the output signal cannot be received by the conversion chip, the AUX- signal on the pin is normal and the system will be awakened normally. Since the normal HDMI audio and video signal is not received, the system will display that there is no signal on the current channel and enter standby mode after a certain period of time, such as 5 seconds of standby mode without signal. It should be noted that standby mode after no signal is an existing function of HDMI signal receiving devices such as monitors. The GPIO_OUT pin of the conversion chip is pulled low, and the GPIO_OUT pin is pulled high again only when the DP signal is normally recognized and received by the conversion chip. Continue the process of (2).
[0023] (4) When the input device is in the shutdown state, the conversion chip is in the off state. When the DP signal is connected, the GPIO_IN pin of the conversion chip cannot realize the detection function. Therefore, when the DP signal is connected, the main control chip will not be awakened, thereby preventing false triggering and awakening when the device is shut down.
[0024] In summary, the DP to HDMI system with wake-up function of the utility model can realize the conversion of DP signal into HDMI signal, and can realize the functions of no signal standby and signal wake-up. When the system is in standby mode, the conversion chip also enters the low power consumption mode at the same time, so that the standby power consumption of the system is basically not affected.
[0025] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Therefore, any modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention are still within the scope of the technical solution of the present invention.
Claims
1. A DP to HDMI system with a wake-up function, comprising a conversion chip, wherein the conversion chip is connected between a DP signal output device and a main control chip of an HDMI signal receiving device, and converts the DP signal into an HDMI signal and then inputs it into the main control chip; characterized in that: It also includes a voltage control circuit, which includes a triode, a MOS tube, a first resistor, a second resistor and a third resistor. The base of the triode is connected to one end of the first resistor, the emitter of the triode is grounded, the collector of the triode is respectively connected to one end of the second resistor and one end of the third resistor, the gate of the MOS tube is connected to the other end of the third resistor, the drain of the MOS tube and the other end of the second resistor are both connected to a voltage source, the other end of the first resistor is connected to the output pin of the conversion chip, and the source of the MOS tube is connected to the power pin of the main control chip; the input pin of the conversion chip is connected to the AUX auxiliary pin of the DP signal output device, and the hot-swap pin of the conversion chip is connected to the hot-swap pin of the main control chip.
2. The DP to HDMI system with wake-up function according to claim 1, characterized in that: The integrated circuit bus pin of the conversion chip is connected to the integrated circuit bus pin of the main control chip.
3. The DP to HDMI system with wake-up function according to claim 1, characterized in that: A capacitor is connected between the AUX auxiliary pin of the conversion chip and the AUX auxiliary pin of the DP signal output device.
4. The DP to HDMI system with wake-up function according to claim 1, characterized in that: The voltage of the voltage source is the same as the power supply voltage of the main control chip.