A control circuit and method for shutting down Ethernet power supply

Abstract

The present invention provides a control circuit and method for shutting down Ethernet power supply, the control circuit comprising: a DC power supply detection circuit; a photoelectric isolator electrically connected to the DC power supply detection circuit; an Ethernet power supply control circuit electrically connected to the photoelectric isolator; wherein, when the DC power supply detection circuit detects a DC power supply signal, a detection signal is generated, and the detection signal is transmitted to the Ethernet power supply control circuit through the photoelectric isolator to control the Ethernet power supply control circuit to shut down the Ethernet power supply circuit. The solution provided by the present invention detects the DC power supply signal through the DC detection circuit, has higher reliability, and automatically controls and shuts down the Ethernet circuit through the Ethernet power supply control circuit, thereby reducing the power consumption of the power supply system.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit control, and in particular to a control circuit and method for shutting down Power over Ethernet. Background Art

[0002] With the progress of society and the rapid development of various communication technologies, Ethernet communication equipment can be seen everywhere. Power Over Ethernet (POE), also known as POE power supply, can obtain power directly from Ethernet cables without laying power lines separately, which simplifies system wiring and reduces the construction cost of network infrastructure.

[0003] Moreover, most devices are compatible with POE and ordinary local DC (Direct Current) direct power supply. However, when the existing PD (Powered Device) equipment is powered by DC and POE at the same time, it is difficult to give priority to the local DC power supply, and it is impossible to completely shut down the POE power supply. This causes the PSE (Power Sourcing Equipment) equipment to repeatedly switch on and off to detect the load, resulting in energy waste. At the same time, it causes the PSE equipment to mistakenly detect that there is a PD device working. On some switches that allocate power consumption according to the POE protocol, it will cause multiple connected PD devices to fail to work properly. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a control circuit and method for shutting down Power over Ethernet, so as to realize shutting down POE power supply when DC power supply and POE power supply exist at the same time, thereby reducing the power consumption and cost of the circuit power supply system.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a control circuit for shutting down Power over Ethernet, the circuit comprising:

[0006] DC power supply detection circuit;

[0007] A photoelectric isolator electrically connected to the DC power supply detection circuit;

[0008] A power over Ethernet control circuit electrically connected to the photoelectric isolator;

[0009] When the DC power supply detection circuit detects a DC power supply signal, a detection signal is generated. The detection signal is transmitted to the Ethernet power supply control circuit through the photoelectric isolator to control the Ethernet power supply control circuit to shut down the Ethernet power supply circuit.

[0010] Optionally, the DC power supply detection circuit includes: a DC power supply socket, the DC power supply socket having a first pin, a second pin and a third pin;

[0011] wherein the first pin is electrically connected to the input end of the photoelectric isolator through a first resistor;

[0012] The second pin outputs the detection signal, and the second pin is electrically connected to the input end of the photoelectric isolator through a second resistor;

[0013] The third pin is grounded.

[0014] Optionally, the input end of the photoelectric isolator is electrically connected to the second resistor through a first transistor;

[0015] The output end of the photoelectric isolator is electrically connected to the Ethernet power supply control circuit.

[0016] Optionally, one end of the second resistor is electrically connected to a third resistor and a fourth resistor;

[0017] The first end of the second resistor is electrically connected to the second end of the third resistor;

[0018] The first end of the second resistor is electrically connected to the first end of the fourth resistor; the second end of the fourth resistor is electrically connected to one end of the first transistor;

[0019] One end of the first transistor is grounded.

[0020] Optionally, it also includes: a fifth resistor electrically connected to the input end of the photoelectric isolator; and a sixth resistor electrically connected to the output end of the photoelectric isolator.

[0021] Optionally, the Ethernet power supply control circuit includes: a MOS tube, and a voltage regulator diode electrically connected to one end of the MOS tube;

[0022] The MOS tube is electrically connected to the voltage stabilizing diode via a seventh resistor;

[0023] One end of the seventh resistor is electrically connected to the output end of the photoelectric isolator.

[0024] Optionally, the drain and source of the MOS tube are electrically connected to an Ethernet power supply circuit respectively;

[0025] The MOS tube is cut off according to the isolated electrical signal outputted from the output end of the photoelectric isolator, and controls the Ethernet power supply circuit to be turned off.

[0026] An embodiment of the present invention further provides a method for controlling Ethernet power supply shutdown, which is applied to a control circuit for shutting down an Ethernet power supply circuit as described in any of the above embodiments, and the method comprises:

[0027] When the DC power supply detection circuit detects a DC power supply signal, a detection signal is generated;

[0028] The detection signal is transmitted to the Ethernet power supply control circuit through the photoelectric isolator, and the Ethernet power supply control circuit is controlled to shut down the Ethernet power supply.

[0029] Optionally, also include:

[0030] The photoelectric isolator performs isolation conversion on the detection signal to obtain an isolated electrical signal after isolation conversion and transmits the isolated electrical signal to the Ethernet power supply control circuit;

[0031] In the Ethernet power supply control circuit, the MOS tube receives the electrical signal and is cut off according to the electrical signal to control the Ethernet power supply circuit to be turned off.

[0032] Optionally, the detection signal is a high-level electrical signal generated when the DC power supply is connected to the DC power socket.

[0033] The above solution of the present invention includes at least the following beneficial effects:

[0034] The above-mentioned scheme of the present invention, through a DC power supply detection circuit, detects that power is connected and shuts off the Ethernet power supply according to the photoelectric isolator and the Ethernet power supply control circuit, thereby reducing the power consumption of the power supply system. At the same time, it solves the problem that some switches that allocate power consumption according to the Ethernet power supply protocol cause multiple connected electrical devices to fail to work normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of a control circuit for shutting down Power over Ethernet provided by an embodiment of the present invention;

[0036] Figure 2 It is a schematic diagram of a DC power supply detection circuit provided by an optional embodiment of the present invention.

[0037] Explanation of the accompanying symbols: 1. First pin; 2. Second pin; 3. Third pin; 4. DC power socket; 5. DC power detection circuit; 6. Ethernet power supply control circuit; R1. First resistor; R2. Second resistor; R3. Third resistor; R4. Fourth resistor; R5. Fifth resistor; R6. Sixth resistor; R7. Seventh resistor; Q4. MOS tube; Q5. First transistor; D17. Zener diode; U23. Opto-isolator. DETAILED DESCRIPTION

[0038] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0039] like Figure 1 As shown, an embodiment of the present invention proposes a control circuit for shutting down Ethernet power supply, including: a DC power supply detection circuit 5; a photoelectric isolator U23 electrically connected to the DC power supply detection circuit 5; and an Ethernet power supply control circuit 6 electrically connected to the photoelectric isolator U23; wherein, when the DC power supply detection circuit 5 detects a DC power supply signal, a detection signal is generated, and the detection signal is transmitted to the Ethernet power supply control circuit 6 through the photoelectric isolator U23, so as to control the Ethernet power supply control circuit to shut down the Ethernet power supply circuit.

[0040] In this embodiment, the Ethernet power supply control circuit 6 is electrically connected to the Ethernet power supply circuit, and the detection signal can be a high-level electrical signal generated when the DC power supply is connected to the DC power supply detection circuit 5. The high-level electrical signal is photoelectrically converted and isolated by the photoelectric isolator, and an isolated electrical signal with the same potential as the input end of the system Ethernet power supply is output and transmitted to the Ethernet power supply control circuit 6. The Ethernet power supply control circuit 6 controls the Ethernet power supply circuit to shut down according to the received isolated electrical signal with the same potential; the control circuit realizes automatic shutdown of the Ethernet power supply circuit when a local non-48V power supply is connected by simplifying the circuit, thereby reducing the power consumption of the system power supply. At the same time, the circuit does not require the participation of software and CPU, and has higher reliability.

[0041] In an optional embodiment of the present invention, Figure 2 As shown, the DC power supply detection circuit 5 includes: a DC power supply socket 4, the DC power supply socket having a first pin 1, a second pin 2 and a third pin 3; wherein the first pin 1 is electrically connected to the input end of the photoelectric isolator U23 through a first resistor R1; the second pin 2 outputs the detection signal, and the second pin 2 is electrically connected to the input end of the photoelectric isolator U23 through a second resistor R2; the third pin 3 is grounded.

[0042] In this embodiment, the DC power socket 4 uses a three-pin DC power socket, and a pull-up circuit is added to the second pin of the DC power socket. When there is no local DC power supply connected, the second pin is connected to the ground wire through the third pin, and there is no high-level electrical signal in the circuit; when there is a local DC power supply connected, the spring of the second pin is disconnected from the third pin, and a high-level electrical signal is generated in the circuit, thereby achieving the purpose of DC power supply connection detection; at the same time, the high-level electrical signal is transmitted to the photoelectric isolator U23 through the second pin for conversion and isolation, and the obtained isolated electrical signal is output through the output end of the photoelectric isolator U23 and transmitted to the Ethernet power supply control circuit 6.

[0043] Furthermore, the input end of the photoelectric isolator U23 is electrically connected to the second resistor R2 through the first transistor Q5; the output end of the photoelectric isolator U23 is electrically connected to the Ethernet power supply control circuit 6.

[0044] Further, one end of the second resistor R2 is electrically connected to the third resistor R3 and the fourth resistor R4; the first end of the second resistor R2 is electrically connected to the second end of the third resistor R3; the first end of the second resistor R2 is electrically connected to the first end of the fourth resistor R4; the second end of the fourth resistor R4 is electrically connected to one end of the first transistor Q5; and one end of the first transistor Q5 is grounded. In this embodiment, the connection of the first transistor Q5 further ensures the singleness of the transmission direction of the electrical signal in the control circuit.

[0045] In an optional embodiment of the present invention, the control circuit further includes: a fifth resistor R5 electrically connected to the input end of the photoelectric isolator U23; and a sixth resistor R6 electrically connected to the output end of the photoelectric isolator U23.

[0046] In this embodiment, the first end of the fifth resistor R5 is electrically connected to the input end of the photoelectric isolator U23, and the first end of the sixth resistor R6 is electrically connected to the output end of the photoelectric isolator U23 to avoid damage to the device due to excessive circuit current.

[0047] In an optional embodiment of the present invention, the Ethernet power supply control circuit 6 includes: a MOS tube Q4, and a voltage regulator diode D17 electrically connected to one end of the MOS tube Q4; the MOS tube Q4 and the voltage regulator diode D17 are electrically connected through a seventh resistor R7; one end of the seventh resistor R7 is electrically connected to the output end of the photoelectric isolator U23.

[0048] Furthermore, the drain and source of the MOS tube Q4 are electrically connected to the Ethernet power supply circuit respectively; the MOS tube Q4 is cut off according to the isolated electrical signal outputted from the output end of the photoelectric isolator U23, thereby controlling the Ethernet power supply circuit to be turned off.

[0049] In this embodiment, the MOS transistor Q4 serves as a switch of the Ethernet power supply control circuit 6. The MOS transistor Q4 is preferably an N-channel MOS transistor, and the on-resistance of the MOS transistor Q4 is relatively small. The gate of the MOS transistor Q4 is electrically connected to the output end of the photoelectric isolator U23 through the seventh resistor R7. The isolated electrical signal output by the output end of the photoelectric isolator U23 may be an isolated voltage signal. The gate of the MOS transistor Q4 receives the isolated voltage signal, and the MOS transistor Q4 is turned off according to the isolated voltage signal. Since the drain and source of the MOS transistor Q4 are electrically connected to the Ethernet power supply circuit respectively, after the MOS transistor Q4 is turned off, the Ethernet power supply is disconnected, thereby avoiding the existence of DC power supply and Ethernet power supply in the entire power supply system at the same time, thereby reducing the power consumption of the entire power supply system. At the same time, the setting of the voltage regulator diode D17 is mainly to prevent the voltage between the gate and the drain of the MOS transistor Q4 from being too large.

[0050] An embodiment of the present invention further provides a method for controlling shutdown of an Ethernet power supply circuit, which is applied to the target power shutdown control circuit described in any of the above embodiments, and the method includes:

[0051] Step S1, when the DC power supply detection circuit 5 detects a DC power supply signal, a detection signal is generated;

[0052] Step S2, the detection signal is transmitted to the Ethernet power supply control circuit 6 through the photoelectric isolator U23, and the Ethernet power supply control circuit is controlled to shut down the Ethernet power supply circuit.

[0053] Furthermore, the photoelectric isolator U23 isolates and converts the detection signal to obtain an isolated electrical signal after isolation and conversion and transmits it to the Ethernet power supply control circuit 6; in the Ethernet power supply control circuit 6, the MOS tube Q4 receives the electrical signal, and is turned on according to the electrical signal to control the Ethernet power supply circuit to shut down.

[0054] Furthermore, the detection signal is a high-level electrical signal generated when the DC power supply is connected to the DC power socket 4 .

[0055] In this embodiment, the DC power supply detection circuit 5 can detect the access of the DC power supply through the DC power supply socket, and generate a detection signal of the access of the DC power supply. The detection signal is a high-level electrical signal generated when the DC power supply is connected to the DC power supply socket 4. The high-level electrical signal is transmitted to the photoelectric isolator U23, and the isolated electrical signal after output isolation is obtained through the conversion and isolation processing of the photoelectric isolator U23. The isolated electrical signal is transmitted to the MOS tube Q4 through the Ethernet power supply control circuit 6, and the MOS tube Q4 is turned off, further shutting down the Ethernet power supply circuit; in this method, the generated electrical signal is directly used as the control signal, and the electrical signal is converted and transmitted through the photoelectric isolator U23, without the need for the access of equipment such as software and CPU, the reliability is higher, and the monitoring cost is reduced; at the same time, by shutting down the Ethernet power supply, the power consumption of the entire power supply system is reduced.

[0056] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A control circuit for shutting down power over Ethernet, characterized in that: include: DC power supply detection circuit (5); A photoelectric isolator (U23) electrically connected to the DC power supply detection circuit; An Ethernet power supply control circuit (6) electrically connected to the photoelectric isolator (U23); When the DC power supply detection circuit (5) detects a DC power supply signal, a detection signal is generated, the detection signal is a high-level electrical signal generated when the DC power supply is connected to the DC power supply detection circuit, the detection signal is photoelectrically converted and isolated by the photoelectric isolator (U23), and transmitted to the input end of the Ethernet power supply control circuit (6) as an isolated electrical signal with equal potential, so as to control the Ethernet power supply control circuit (6) to shut down the Ethernet power supply circuit; The DC power supply detection circuit (5) comprises: a DC power supply socket (4), wherein the DC power supply socket has a first pin (1), a second pin (2) and a third pin (3); The first pin (1) is electrically connected to the input end of the photoelectric isolator (U23) via a first resistor (R1); The second pin (2) outputs the detection signal, and the second pin (2) is electrically connected to the input end of the photoelectric isolator (U23) via a second resistor (R2); The third pin (3) is grounded; Wherein, a pull-up circuit is added to the second pin (2) of the DC power socket, and when no local DC power is connected, the second pin (2) is connected to the ground wire through the third pin (3), and there is no high-level electrical signal in the circuit; When a local DC power source is connected, the spring of the second pin (2) is disconnected from the third pin (3), a high-level electrical signal is generated in the circuit, and the DC power source connection is detected; and the high-level electrical signal is transmitted to the photoelectric isolator (U23) through the second pin (2) for conversion and isolation, and the obtained isolated electrical signal is output through the output end of the photoelectric isolator (U23) and transmitted to the Ethernet power supply control circuit (6); The input end of the photoelectric isolator (U23) is electrically connected to the second resistor (R2) via a first transistor (Q5); The output end of the photoelectric isolator (U23) is electrically connected to the Ethernet power supply control circuit; The Ethernet power supply control circuit (6) comprises: a MOS tube (Q4), and a voltage regulator diode (D17) electrically connected to one end of the MOS tube (Q4); The MOS tube (Q4) is electrically connected to the voltage stabilizing diode (D17) via a seventh resistor (R7); One end of the seventh resistor (R7) is electrically connected to the output end of the photoelectric isolator (U23); The drain and source of the MOS tube (Q4) are electrically connected to the Ethernet power supply circuit respectively; The MOS tube (Q4) is cut off according to the isolated electrical signal outputted from the output end of the photoelectric isolator (U23), thereby controlling the Ethernet power supply circuit to be turned off.

2. The control circuit for shutting down the power supply over Ethernet according to claim 1, characterized in that: One end of the second resistor (R2) is electrically connected to a third resistor (R3) and a fourth resistor (R4); The first end of the second resistor (R2) is electrically connected to the second end of the third resistor (R3); The first end of the second resistor (R2) is electrically connected to the first end of the fourth resistor (R4); the second end of the fourth resistor (R4) is electrically connected to one end of the first transistor (Q5); One end of the first transistor (Q5) is grounded.

3. The control circuit for shutting down the power over Ethernet according to claim 2, characterized in that: Also includes: a fifth resistor (R5) electrically connected to the input end of the photoelectric isolator (U23); and a sixth resistor (R6) electrically connected to the output end of the photoelectric isolator (U23).

4. A method for controlling the shutdown of Ethernet power supply, characterized in that: The method applied to the control circuit for shutting down Power over Ethernet according to any one of claims 1 to 3 comprises: When the DC power supply detection circuit (5) detects a DC power supply signal, it generates a detection signal; The detection signal is transmitted to the Ethernet power supply control circuit (6) through the photoelectric isolator (U23), and controls the Ethernet power supply control circuit (6) to shut off the Ethernet power supply.

5. The method for controlling the shutdown of Power over Ethernet according to claim 4, characterized in that: Also includes: The photoelectric isolator (U23) performs isolation conversion on the detection signal to obtain an isolated electrical signal after isolation conversion and transmits the isolated electrical signal to the Ethernet power supply control circuit (6); In the Ethernet power supply control circuit, the MOS tube (Q4) receives the electrical signal and is cut off according to the electrical signal to control the Ethernet power supply circuit to be turned off.

6. The method for controlling the shutdown of Power over Ethernet according to claim 4, characterized in that: The detection signal is a high-level electrical signal generated when the DC power supply is connected to the DC power socket (4).

Images