TWI393899B - Leakage current detecting device and method therefor - Google Patents

Description

Leakage detecting device and method

The present invention relates to the field of leakage detection, and more particularly to an apparatus and method for remotely detecting or leaking power to one or more computers.

Due to the rapid development of information technology, the application of multiple computers and their peripheral products is quite popular. In order to meet the different needs and cost considerations of users, KVM switch (KVM, the shorthand for Keyboard, Video, and Mouse) came into being. Multi-computer switchers, also known as electronic switchers, are different from traditional mechanical switches (Data Switch). Their main function is to control, switch, and control through the console device (at least one set of keyboard, screen and mouse). Manage multiple computers.

KVM switch can connect and cascade KVM switch and KVM switch according to requirements. Up to 4,000 computers can be connected at present. Only if the equipment in the equipment room is not properly grounded or the grounding specification of the equipment power system is not implemented, the problem that the control unit (at least one set of keyboard, screen and mouse) cannot display the screen often occurs after the KVM switch is used for a period of time.

Please refer to the first figure, which shows a proper schematic diagram of the grounding of the equipment room. In a typical operation, the local computer room equipment 11 (for example, a computer) is connected to the local control terminal 12, and the remote control terminal 13 is coupled to a remote control terminal device 14 (for example, a set of keyboards, screens, and slides). mouse). The local control terminal 12 and the remote control terminal 13 are connected by a CAT5 cable. The local control terminal 12 device has a good grounding condition, so the remote control terminal device 14 can display the screen normally.

Please refer to the second figure, which shows a schematic diagram of the conventional equipment room that is not grounded or grounded. In the case that the local equipment room equipment 21 is not grounded or the grounding is not in compliance with the specifications, the leakage current of the local equipment room equipment 21 will also be transmitted to the remote equipment room along the local control terminal 22, the CAT5 connection line and the remote control terminal 23 in sequence. twenty four. Therefore, the remote room equipment 24 will not be displayed properly.

The object of the present invention is to provide a leakage detecting device and method, which can be embedded in a KVM switch or a signal extender, and detects the electronic signal of the system to reflect whether the grounding state of the system is good or not, thereby avoiding leakage. Factors cause equipment damage or display failure to improve equipment life.

According to the above object, an aspect of the present invention provides a leakage detecting apparatus, comprising: an adding circuit, which adds one pair of electronic signals from one device to each other to output a composite signal; and a filtering circuit that filters the synthesized signal and Obtaining a potential to be measured; and a detecting circuit, comparing the potential to be tested with a reference potential to determine whether the device is leaking, and obtaining a leakage detecting signal.

According to the above object, another aspect of the present invention provides a multi-computer switching system, including: a plurality of first interfaces coupled to a plurality of computers: a plurality of second interfaces coupled to a plurality of personal computer interface devices; and a switching device And a communication device between the computer and the human-machine interface device; and a leakage detecting device disposed on the switching device, the leakage detecting device comprising: an adding circuit for inputting electronic signals from one of the computers to each other Adding to output a composite signal; a filter circuit for filtering the synthesized signal and obtaining a potential to be measured; and a detecting circuit for comparing the potential to be measured with a reference potential to determine whether at least one computer of the computers is leaking And obtain a leakage detection signal.

According to the above object, the present invention further provides a signal extending device, comprising: a first extender coupled to at least one computer; a second extender coupled to the plurality of personal computer interface devices and the first extender; and a leakage current The detecting device is disposed on the second extender, the leakage detecting device includes: an adding circuit, adding the electronic signals from one of the computers to each other to output a composite signal; and filtering the filter Synthesizing the signal and obtaining a potential to be measured; and a detecting circuit comparing the potential to be measured with a reference potential to determine whether the computer is leaking and obtaining a leakage detecting signal.

Please refer to the third drawing, which is a schematic view showing the position of an embodiment of the present invention. The local room equipment 31 (for example, at least one computer) is connected to the local control terminal 32, and the remote control terminal 33 is coupled to a remote device 34 (for example, a set of keyboards, screens, and mice). The local control terminal 32 and the remote control terminal 33 are connected by a CAT5 cable. As shown in the figure, the leakage detecting device 331 of the present embodiment is installed in the device of the remote control terminal 33 for detecting and monitoring whether the local device 31 is leaking, and avoiding that the local device 31 is not grounded or grounded. The leakage current signal transmitted during the specification affects the remote device 34 (for example, at least one set of keyboards, screens, and mice) cannot display the picture and does not function properly.

Please refer to the fourth figure, which is a schematic view showing the relative position of an embodiment of the present invention. The leakage detecting device 43 of the present embodiment is disposed inside the remote end signal extender 41 or inside the local end signal extender 42. The remote end signal extender 41 includes a remote end signal extender front view panel 411 and a The remote end signal extender rear view panel 412, the remote end signal extender rear view panel 412 can be connected to the remote end control computer host, keyboard, screen and mouse, and can transmit signals through the CAT5 cable and the local end. The extender 42 is connected up to a distance of up to 300 meters or more; the local end signal extender 42 includes a local end signal extender front view panel 421 and a local end signal extender rear view panel 422, a local end signal extender The front view panel 421 can be connected to a plurality of computers or servers via a local KVM switch (not shown), and the local end signal extender rear view panel 422 can be connected to the host, keyboard, and screen of the local control computer. And devices such as mice. The embedded leakage detecting device 43 of the present embodiment can detect the grounding of the device connected to the remote end signal extender rear view panel 412 or the local end signal extender rear view panel 422. If the computer leaks, the leakage detecting device 43 inside the signal extender 41/42 at the remote end or the local end can measure the leakage signal and display the leakage signal on the local end and the far end through the signal extender 41/42. Control the computer.

Please refer to the fifth figure, which is a schematic view showing the mounting position of another embodiment of the present invention. The KVM switch 51 and 52 are connected to each other. The KVM switch 51 connects at least one control module through the CAT5 cable, and the control module is connected to a set of control devices (for example, a set of keyboards, screens, and mice). The embedded leakage detecting device 56 of this embodiment can be installed in the control terminal module. The KVM switch 52 is connected to a plurality of computer adapters 53 via a CAT5 cable, and each computer adapter 53 is connected to a computer. The KVM switches 51 and 52 are arranged to arrange all signals transmission between the computer connected to the computer adapter 53 and the control device connected to the control module. The embedded leakage detecting device 56 of the present embodiment is installed inside a CAT5 matrix KVM switch 51 or 52, and can be used to monitor the computer terminal connected to the CAT5 matrix KVM switch 52. The leakage current of the connector 53 and/or the servo 54 can also be used to monitor another CAT5 matrix KVM switch connected to the CAT5 matrix KVM switch 52. The leakage current of 51 and/or a local computer 55.

Please refer to the sixth figure, which is a schematic diagram showing three pairs of video signals in three colors of red, green and blue according to an embodiment of the present invention. In this embodiment, the local control terminal 61 is connected to the remote control terminal 62 by at least three pairs of twisted pairs in the CAT5 connection line, wherein a pair of twisted pairs carries a pair of video signals, and the three pairs of video signals respectively correspond to red. The leakage detecting device 621 of the present embodiment is installed in a remote control terminal 62, and the leakage detecting device 621 captures three kinds of red, green and blue transmitted by the local control terminal 61. A pair of differential signals of any of the three pairs of color signals for subsequent serial signal processing procedures and providing a leakage alert. In addition, in this embodiment, three pairs of video signals of three colors of red, green and blue are respectively sent into an operational amplifier (OP), and the differential signal is converted into a single-ended signal, and then the horizontal vertical synchronization signal extraction unit is further The horizontal sync signal and the vertical sync signal are extracted from the video signal for transmission to a display device, such as a liquid crystal display panel or other type of display, to display an image of the computer connected to the local control terminal 61.

Please refer to the seventh figure, which is a block diagram showing another embodiment of the present invention. The leakage detecting device 70 of the present embodiment includes a switching switch 71, an adding circuit 72, a filtering circuit 73, a detecting unit 74 and a pointing device 75. The detecting unit 74 further includes a detecting circuit 741.

In a typical operation, the user can select one end of the plurality of input ends of the switch 71 for the connected device that needs to be detected according to the requirement, so as to be connected to the connected device to be detected, and the input device is coupled to the device. a signal transmission line, which outputs a pair of electronic signals from the signal transmission line through the output end of the switch 71, and introduces the pair of electronic signals to the adding circuit 72, wherein the pair of electronic signals are a pair of differentials in this embodiment The signal may be any one of three pairs of video signals of three colors of red, green and blue, and the adding circuit 72 is an adder in this embodiment, but in other embodiments may be a processor or Other equivalent devices that can be added by the signal. The electronic signal is added by the adding circuit 72 to form a composite signal. In this embodiment, the positive and negative electrodes of the differential signal are added to each other to cancel the positive and negative signals of the same phase and amplitude to form a combined signal. In this embodiment, the synthesized signal is an electronic signal that is close to zero potential but has high frequency noise. The composite signal is repeatedly transmitted to the filter circuit 73. In the present embodiment, the filter circuit 73 is a low pass filter. However, in other embodiments, the characteristics of the filter circuit 73 can be designed according to the noise characteristics of the synthesized signal.

The synthesized signal is filtered by the filter circuit 73 and the noise is filtered, and then output to a detection circuit 741 of the detecting unit 74. At this time, a potential to be measured is obtained from the filtered composite signal. In this embodiment, the potential to be measured is an electronic signal close to zero potential. The detecting unit 64 obtains a display signal to be sent to a pointing device 75 according to the result of the potential comparison between the potential to be measured and the reference potential, wherein the indicating device can display a leakage state with a light emitting diode or a screen display. The menu (OSD) is transmitted so that the user can know whether the connected devices at the local end and the telephoto end have a true ground leakage on the window display that they operate. In the present embodiment, when the potential to be measured is higher than the potential of the reference potential, a display signal is obtained to represent a leakage current condition. The pointing device is one of a display, a buzzer, a speaker, and a light emitting diode, or any combination thereof. At least two of the adding circuit, the filtering circuit and the detecting circuit are disposed in a central processing unit.

Referring to FIG. 8, a block diagram of a detecting unit circuit according to an embodiment of the present invention is shown. The detecting unit 74 includes a voltage divider 81, a half-wave rectifier 82, and a comparator 83. The half-wave rectifier 82 and the comparator 83 constitute the detecting circuit 741 of the seventh figure. In the present embodiment, the voltage divider 81 divides the potential of a 3.3V by a variable resistor and adjusts it to a reference potential of about 1V to output to the comparator 83, and the half-wave rectifier 82 transmits the signal from the filter circuit 73. The rectification becomes a constant current to be measured, and is sent to the comparator 83 for comparison with the reference potential, and a leakage detection signal is obtained and transmitted to a leakage indicating device 75 for displaying the leakage state.

Please refer to the ninth figure, which shows a detection waveform diagram of an embodiment of the present invention. In the ninth figure, the vertical axis represents the detected waveform, and the horizontal axis represents time, wherein the signal a waveform is a generally normal RGB signal waveform, and the signals b, c waveform and the signal d, e waveform are different in different embodiments. The signal pair, the signals f, g waveforms are measured by the addition circuit 72. The signals h and i are measured by the detection unit 74, wherein the signal h waveform represents a safe state in which the system is well grounded and has no leakage, and the signal i waveform represents that the system is in poor grounding and has occurred. In the dangerous state of leakage, the signal i waveform is regarded as a leakage detection signal.

In summary, the present invention provides a leakage detecting apparatus and method for detecting a pair of electronic signals of a connected device and obtaining an electronic signal through the processing to represent whether the power system environment in the equipment room has leakage or grounding. The situation happened. According to the above object, another aspect of the present invention provides a leakage detection method, which is applied to a machine platform, the machine station is coupled to at least one device, and the at least one device has at least one signal transmission line, and the leakage detection method includes the following steps. (a) adding electronic signals from one of the devices to each other to output a composite signal; (b) filtering the synthesized signal and obtaining a potential to be measured; (c) comparing the potential to be measured with a reference potential And determining (b) displaying a leakage state of the at least one device according to the leakage detection signal.

The step (a) further includes the following steps: (a1) adding any pair of electronic signals of three pairs of video signals including three colors of red, green and blue in the signal transmission line, wherein the pair of electronic signals comprises a positive and negative signal; And (a2) adding the positive and negative signals to offset the same phase and amplitude portions of the positive and negative signals.

Wherein step (b) further comprises the steps of: (b1) removing the high frequency portion of the composite signal; and (b2) removing the noise portion of the composite signal.

The step (c) further includes the following steps: (c1) when the potential to be measured is higher than the reference potential, the leakage detection signal is obtained to represent a leakage current condition.

The positive and negative signals are in phase. The at least one device is at least one computer system. The potential to be measured is a constant current potential. The reference potential is an adjustable DC potential. The leakage detecting method further includes a step of receiving the leakage detecting signal and displaying a leakage state of the at least one device. The leakage state of the at least one device is displayed by displaying a window display, a light-emitting diode display, and starting a buzzer and a speaker on a screen display.

The above-described embodiments are merely illustrative of the principles of the preferred embodiments of the invention and their advantages, and are not intended to limit the invention. Therefore, those skilled in the art can make modifications and changes to the above-described embodiments without departing from the spirit and scope of the invention.

11. . . Local device

12. . . Local console

13. . . Remote control terminal

14. . . Remote device

twenty one. . . Local device

twenty two. . . Local console

twenty three. . . Remote control terminal

twenty four. . . Remote device

31. . . Local device

32. . . Local console

33. . . Remote control terminal

34. . . Remote device

331. . . Embedded leakage detecting device

41. . . Remote signal extender

42. . . Local signal extender

411. . . Remote signal extender front panel

412. . . Remote signal extender rear view panel

421. . . Local signal extender front panel

422. . . Local signal extender rear view panel

43. . . Embedded leakage detecting device

51. . . CAT5 matrix KVM switch

52. . . CAT5 matrix KVM switch

53. . . PS/2 or USB computer adapter

54. . . server

55. . . Local computer

56. . . Embedded leakage detecting device

61. . . Local console

62. . . Remote control terminal

621. . . Embedded leakage detecting device

71. . . Toggle switch

72. . . Addition circuit

73. . . Filter circuit

74. . . Detection unit

741. . . Detection circuit

75. . . Indicator device

81. . . Voltage divider

82. . . Half wave rectifier

83. . . Comparators

First picture: It shows a proper schematic diagram of the well-known equipment grounding.

Second figure: It shows that the conventional equipment is not grounded or the grounding does not conform to the specification.

Third: It shows a schematic view of the installation position of an embodiment of the present invention.

Fourth Figure: It shows a schematic diagram of the relative position of an installation according to an embodiment of the present invention.

Fig. 5 is a schematic view showing the mounting position of another embodiment of the present invention.

Figure 6 is a schematic diagram showing three pairs of video signal acquisition modes of red, green and blue colors according to an embodiment of the present invention.

Figure 7 is a block diagram showing a circuit of an embodiment of the present invention.

Figure 8 is a block diagram showing the circuit of a detecting unit in accordance with an embodiment of the present invention.

Ninth Diagram: This shows a detection waveform diagram of an embodiment of the present invention.

71. . . Toggle switch

72. . . Addition circuit

73. . . Filter circuit

74. . . Detection unit

741. . . Detection circuit

75. . . Indicator device

Claims (27)

A multi-computer switching system comprising: a plurality of first interfaces coupled to a plurality of computers: a plurality of second interfaces coupled to a plurality of personal computer interface devices; a switching device for arranging the computers and the human-machine interface devices And a leakage detecting device disposed on the switching device, the leakage detecting device comprising: an adding circuit, adding one of the electronic signals from the computers to each other to output a composite signal; a filter circuit that filters the synthesized signal and obtains a potential to be measured; and a detection circuit that compares the potential to be measured with a reference potential to determine whether at least one computer of the computers is leaking and obtains a leakage detection signal. The system of claim 1, wherein the leakage detecting device further comprises a switch having a plurality of input terminals and an output terminal, each of the plurality of input terminals being coupled to a signal transmission line of the computer, The pair of electronic signals from the signal transmission line are output by the output terminal. The system of claim 1, wherein the adding circuit is one of a processor and an adder. The system of claim 1, wherein the pair of electronic signals is a differential signal. The system of claim 1, wherein the detecting circuit further comprises a half-wave rectifying circuit and a comparator. The system of claim 1, wherein the pair of electronic signals are any one of three pairs of video signals of three colors: red, green and blue. The system of claim 1, further comprising a pointing device that receives the leakage detecting signal and displays a leakage state of the device. The system of claim 7, wherein the indicating device is one of a display, a buzzer, a speaker, and a light emitting diode, or any combination thereof. The system of claim 1, wherein at least two of the adding circuit, the filtering circuit and the detecting circuit are disposed in a central processing unit. A leakage detecting method is applied to a machine platform, the machine station is coupled to at least one device, and the at least one device has at least one signal transmission line, and the leakage detecting method comprises the following steps: (a) coming from the device a pair of electronic signals are added to each other to output a composite signal; (b) filtering the composite signal to obtain a potential to be measured; (c) comparing the potential to be measured with a reference potential to determine whether the at least one device is leaking, And obtaining a leakage detection signal; and (d) displaying a leakage state of the at least one device according to the leakage detection signal. The method of claim 10, wherein the step (a) further comprises the following steps: (a1) adding any pair of electronic signals of three pairs of video signals including three colors of red, green and blue in the signal transmission line, wherein the pair of electronic signals comprise a positive and negative signal; and (a2) the positive and negative signals Adding, the phases of the same phase and the amplitude of the positive and negative signals are offset each other. The method of claim 10, wherein the aligned positive and negative signals are in phase. The method of claim 10, wherein the step (b) further comprises the steps of: (b1) removing the high frequency portion of the composite signal; and (b2) removing the noise portion of the composite signal. The method of claim 10, wherein the step (c) further comprises the step of: (c1) obtaining the leakage detection signal to represent a leakage current condition when the potential to be measured is higher than the reference potential. The leakage detecting method of claim 10, wherein the at least one device is at least one computer system. The method of claim 10, wherein the potential to be measured is a direct current potential. The method of claim 10, wherein the reference potential is an adjustable DC potential. The method of claim 10, further comprising a step: Receiving the leakage detection signal and displaying a leakage state of the at least one device. The method of claim 18, wherein the leakage state of the at least one device is displayed by popping up a window display, a light emitting diode display, and a buzzer and a speaker. The way it is displayed. A signal extension device includes: a first extender coupled to at least one computer: a second extender coupled to the plurality of personal computer interface devices and the first extender; and a leakage detecting device disposed on the first The second extender, the leakage detecting device comprises: an adding circuit, adding one pair of electronic signals from the computers to each other to output a composite signal; a filtering circuit, filtering the synthesized signal and obtaining a potential to be measured And a detecting circuit, comparing the potential to be tested with a reference potential to determine whether the computer is leaking, and obtaining a leakage detecting signal. The device of claim 20, wherein the leakage detecting device further comprises a switch having a plurality of input terminals and an output terminal, each of the plurality of input terminals being coupled to a signal transmission line of the computer, The pair of electronic signals from the signal transmission line are output by the output terminal. The device of claim 20, wherein the adding circuit is one of a processor and an adder. The device of claim 20, wherein the pair of electronic signals For the differential signal. The device of claim 20, wherein the detecting circuit further comprises a half-wave rectifying circuit and a comparator. The device of claim 20, wherein the pair of electronic signals are any one of three pairs of video signals of three colors: red, green and blue. The device of claim 20, further comprising a pointing device that receives the leakage detecting signal and displays a leakage state of the device. The device of claim 26, wherein the indicating device is one of a display, a buzzer, a speaker, and a light emitting diode, or any combination thereof.