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HPD signal control circuit and HDMI switcher based on same

A signal control circuit and signal technology, applied in the direction of program control, computer control, general control system, etc., can solve the problems of narrow selection, high cost, long research and development time, etc., and achieve the effect of increasing options and reducing costs

Active Publication Date: 2021-09-07
无锡有容微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the external microcontroller (MCU) has the problems of long development time and high cost, and the choice is very narrow

Method used

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  • HPD signal control circuit and HDMI switcher based on same
  • HPD signal control circuit and HDMI switcher based on same
  • HPD signal control circuit and HDMI switcher based on same

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0026] Such as figure 1 Shown is an HPD signal control circuit of this embodiment, including: mechanical switch 00, delay module 0, delay module 1, NMOS01, NMOS02, NMOS11, NMOS12, PMOS03, PMOS13, resistor R0, resistor R1.

[0027] refer to figure 1 In part 01, the mechanical switch 00 is a self-locking key switch, and the self-locking key switch can generate signal S0 and signal S1 at the same time, and select one of the signal S0 and the signal S1 to open through the action of a mechanical key Output high level, while another signal S1 is turned off.

[0028] In the embodiment of the present invention, the self-locking key switch is a six-pin self-locking key switch, wherein pin 1 and pin 6 are grounded, pin 2 generates the signal S1, and pin 3 and pin 4 are connected to 5V voltage source, pin 5 generates the signal S0.

[0029] The signal S0 generates a signal S+ after passing through the delay module 0 , and the signal S1 generates a signal S− after passing through the d...

specific Embodiment 2

[0048] image 3 It is a circuit structure diagram of another embodiment of the present invention, as shown in the figure, the HPD signal control circuit is the same as the part 01 in the specific embodiment 1, and will not be repeated here.

[0049] refer to image 3 As shown in part 02, the signal S0, the signal S1, the signal S+, and the signal S- control N3, N1, N4, and N2 respectively.

[0050] Specifically, the N1, the N2, the N3 and the N4 are all N-type devices.

[0051] The resistor R4 is connected in series with the parallel circuit composed of the N1 and the N2, the resistor R5 is connected in series with the parallel circuit composed of the N3 and the N4, and the signal S2+ is output between the resistor R4 and the parallel circuit , the signal S2- is output between the resistor R5 and the parallel circuit 1 .

[0052] refer to image 3 As shown in part 03, the signals S2+ and S2- control N5 and N6 respectively, and both N5 and N6 are N-type devices.

[0053] T...

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Abstract

A high-level signal is generated through the mechanical action of a mechanical switch, and the other signal is switched off. And the high-level signal controls an MOS device. Meanwhile, the high-level signal generates a delay signal through a delay module. And other MOS devices are controlled through the high-level signal and the delay signal, so that non-overlapped control signals are generated. The non-overlapping control signals enable the two paths of HPDA and HPDB not to be opened at the same time within a certain time, and only one path is opened after the two paths are closed at the same time, so that the HPD is switched to the HPDA or the HPD is switched to the HPDB, a host can judge that an interface of a display is disconnected, and when switching is completed, the host and the display complete handshaking work. An external single-chip microcomputer (MCU) is replaced by a control circuit, so that cvost is reduced, and especially when MCU is out of stock, alternative scheme is added.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to an HPD signal control circuit and an HDMI switcher based on the circuit. Background technique [0002] In daily life, an HDMI (High Definition Multimedia Interface, HDMI) switcher can implement switching of multiple input devices (such as a computer, PS4, set-top box, etc.). A two-way switcher (also known as "AB switcher") is a HDMI switcher that can freely switch two high-definition signal sources to a high-definition display or projector. At the same time, it can also distribute one signal source to two high-definition monitors or projectors, which can be used as a splitter, but when used as a splitter, it can only display the picture of one monitor. To put it simply, it can support two modes, realize two-way conversion, HDMI 2 in 1 out / 1 in 2 out dual selection, two devices connected to one monitor, or one device connected to two monitors. [0003] The function of HDMI (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/042H04N21/4363
CPCG05B19/0423H04N21/43635G05B2219/25257
Inventor 汤小虎刘明
Owner 无锡有容微电子有限公司
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