Adjusting circuit for adjusting power supply line sequence of POE (Power Over Ethernet) system

Abstract

The utility model discloses an adjusting circuit for adjusting the power supply line sequence of a POE system, which comprises a change-over switch and a conversion signal generating circuit, the change-over switch is used for switching the power supply line sequence of the POE system, the conversion signal generating circuit is used for generating a corresponding conversion signal according to the power receiving line sequence of power receiving equipment, and the conversion signal is used for controlling the state of the change-over switch. The conversion signal generation circuit is electrically connected with the conversion switch. Based on the adjusting circuit, the power supply line sequence of the POE can be adjusted, so that the POE can easily meet the power utilization requirements of different power receiving devices.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology for switches, and in particular to an adjustment circuit for adjusting the power supply line sequence of a PoE system. Background Technology

[0002] Power over Ethernet (PoE) is a technology that transmits both data and power over an Ethernet cable. It allows network devices (such as switches or routers) to power other powered devices (PDs) such as IP phones and webcams through the same network cable, without the need for an additional power outlet.

[0003] In PoE systems, the AT and BT standards specify different power supply methods, involving the eight signal wires in the Ethernet cable. Specifically, in the AT standard, the 1 / 2 pair is typically used as the positive power supply pair, and the 3 / 6 pair is typically used as the negative power supply pair. In the BT standard, two power supply pairs are used: the 1 / 2 and 7 / 8 pairs are typically used as the negative power supply pairs, and the 3 / 6 and 4 / 5 pairs are typically used as the positive power supply pairs. Furthermore, different PD devices employ power supply methods different from the AT and BT standards. In most cases, PD devices only support one power supply mode, and network devices with different power supply wiring sequences cannot supply power to PD devices. This low compatibility of power supply wiring sequences is detrimental to practical applications. Utility Model Content

[0004] The purpose of this invention is to provide an adjustment circuit for adjusting the power supply sequence of a PoE system to adapt to the power supply needs of different powered devices.

[0005] To achieve the above objectives, this utility model discloses an adjustment circuit for adjusting the power supply line sequence of a PoE system, comprising:

[0006] A changeover switch, used to switch the power supply line sequence of the PoE system;

[0007] A conversion signal generation circuit is used to generate a corresponding conversion signal according to the power receiving sequence of the power receiving device. The conversion signal is used to control the state of the conversion switch. The conversion signal generation circuit is electrically connected to the conversion switch.

[0008] Optionally, the PoE system includes a positive power supply and at least one pair of power supply lines. The changeover switch includes a relay, the common terminal of which is electrically connected to the power supply line pair, the normally open terminal of which is electrically connected to the positive power supply, one end of the relay coil is used to receive the changeover signal, and the other end of the relay coil is grounded.

[0009] Furthermore, the common terminal of the relay includes a first common terminal and a second common terminal, the normally open terminal of the relay includes a first normally open terminal and a second normally open terminal, and the normally closed terminal of the relay includes a first normally closed terminal and a second normally closed terminal.

[0010] The first common terminal is electrically connected to one of the power supply lines in the pair of power supply lines, the second common terminal is electrically connected to the other power supply line in the pair of power supply lines, the first normally closed terminal and the second normally open terminal are respectively electrically connected to the positive power supply terminal, and the second normally closed terminal and the first normally open terminal are connected to serve as the negative power supply terminal of the POE system.

[0011] Optionally, the conversion signal generation circuit includes a driving voltage source and a DIP switch, wherein the driving voltage source is electrically connected to one end of the DIP switch, and the other end of the DIP switch is electrically connected to one end of the coil of the relay.

[0012] Furthermore, the conversion signal generation circuit also includes a pull-down resistor, and the DIP switch, which is electrically connected to one end of the relay coil, is also grounded through the pull-down resistor.

[0013] Furthermore, the conversion signal production circuit also includes a first current-limiting resistor, which is electrically connected between the drive voltage source and the DIP switch.

[0014] Optionally, the regulating circuit further includes a freewheeling diode, which is electrically connected to both ends of the coil of the relay.

[0015] Optionally, the regulating circuit further includes a second current-limiting resistor, which is electrically connected between the conversion signal generation circuit and the coil of the relay.

[0016] Compared with existing technologies, the adjustment circuit for adjusting the power supply sequence of a PoE system disclosed in the above-mentioned technical solution of this utility model includes a changeover switch and a conversion signal generation circuit. The conversion signal generation circuit generates a conversion signal corresponding to the power receiving sequence of the receiving device. This conversion signal controls the changeover switch, which switches the current transmission direction of existing power supply pairs according to the conversion signal to adjust the power supply sequence within the PoE system, thereby meeting the power supply needs of the receiving device and compatiblely supplying power to various receiving devices. Therefore, based on the above-mentioned adjustment circuit, the power supply sequence can be adjusted according to actual needs, making the PoE system more compatible and suitable for the power requirements of different receiving devices. Attached Figure Description

[0017] Figure 1 This is a circuit diagram of the switching elements, freewheeling diode, and second current-limiting resistor of the first and second adjustment circuits in this embodiment of the present invention.

[0018] Figure 2 This is a circuit diagram of the signal conversion generation circuit in an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the network connector in an embodiment of the present invention. Detailed Implementation

[0020] To explain in detail the technical content, structural features, objectives and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0021] See Figure 1 and Figure 2 As shown, this embodiment discloses an adjustment circuit for adjusting the power supply line sequence of a PoE system. The PoE system includes a positive power supply terminal V+ and at least one pair of power supply lines for supplying power to the powered device. The two power supply lines in a pair of power supply lines are in a one-to-one correspondence. The adjustment circuit includes a changeover switch K and a changeover signal generation circuit SC, which are electrically connected.

[0022] The changeover switch K is used to switch the power supply line sequence of the PoE system. The changeover signal generation circuit SC is used to generate a corresponding changeover signal S according to the power receiving line sequence of the powered device. The changeover signal S is used to control the state of the changeover switch K.

[0023] Specifically, the changeover switch K includes a relay. The common terminal KP of the relay is electrically connected to the power supply line, and the normally open terminal KO of the relay is electrically connected to the positive power supply V+. One end of the relay coil is used to receive the changeover signal S, and the other end of the relay coil is grounded.

[0024] Furthermore, the common terminal KP of the relay includes a first common terminal KP1 and a second common terminal KP2, the normally open terminal KO of the relay includes a first normally open terminal KO1 and a second normally open terminal KO2, and the normally closed terminal KC of the relay includes a first normally closed terminal KC1 and a second normally closed terminal KC2.

[0025] The first common terminal KP1 is electrically connected to one of the power supply lines in the pair of power supply lines, the second common terminal KP2 is electrically connected to the other power supply line in the pair of power supply lines, the first normally closed terminal KC1 and the second normally open terminal KO2 are electrically connected to the positive power supply V+, and the second normally closed terminal KC2 and the first normally open terminal KO1 are connected and used as the negative power supply V- of the POE system.

[0026] On the other hand, see Figure 2 As shown, the conversion signal generation circuit SC includes a driving voltage source VC and a DIP switch SW. The driving voltage source VC is electrically connected to one end of the DIP switch SW, and the other end of the DIP switch SW is electrically connected to one end of the relay coil. The preferred value of the driving voltage source is 3.3V. In this embodiment, the conversion signal S is used to control the energizing state of the relay coil, thereby controlling whether the two power supply lines within a single power supply pair are connected to the positive power supply V+ in the POE system or used as the negative power supply V- of the POE system. When the DIP switch SW is turned up, the driving voltage source VC is connected to the relay coil. At this time, the conversion signal S is at a high level, the relay coil is energized and generates magnetism, and the first common terminal KP1 and the second common terminal KP2 of the relay are electrically connected to the first normally open terminal KO1 and the second normally open terminal KO2 of the relay, respectively. When the DIP switch SW is closed, the path between the driving voltage source VC and the relay coil is broken. At this time, the relay coil loses its magnetism, and the first common terminal KP1 and the second common terminal KP2 are connected to the first normally closed terminal KC1 and the second normally closed terminal KC2 of the relay, respectively.

[0027] See Figure 3 As shown, taking the RJ45 network connector as an example, an Ethernet cable includes 8 signal lines. When a powered device is plugged into the power supply port of a PoE system (such as the RJ45 network connector in this embodiment), the network signal transmission part transmits to the target address through the network connector and network transformer. The power supply part distinguishes these 8 signal lines, forming two pairs of power supply wires. Each pair of power supply wires includes two power supply lines, and each power supply line includes a pair of signal lines. Specifically, lines 1 / 2 and 3 / 6 form the first pair of power supply wires, and lines 4 / 5 and 7 / 8 form the second pair of power supply wires. When powering a powered device compatible with the AT standard, only the power supply wire sequence of the first pair needs to be adjusted. When powering a powered device compatible with the BT standard, both the first and second pairs of power supply wires need to be adjusted simultaneously.

[0028] See Figures 1 to 3 As shown, taking two pairs of power supply lines as an example, each pair of power supply lines is connected to a set of adjustment circuits in this embodiment, referred to as the first adjustment circuit and the second adjustment circuit. The DIP switches SW include a first DIP switch SW1 and a second DIP switch SW2, respectively used to control the switching element K in the first and second adjustment circuits. The conversion signals S received by the first and second adjustment circuits are respectively called the first conversion signal S1 and the second conversion signal S2. By controlling whether the first DIP switches SW1 and SW2 are turned up, the first conversion signal S1 and the second conversion signal S2 are controlled to be at a high or low level, thereby controlling the connection state of each terminal of the corresponding relay, ultimately achieving the function of adjusting the power supply sequence.

[0029] like Figure 1 (a) Taking one of the power supply wire pairs (1 / 2 and 3 / 6) as an example, in the first adjustment circuit, power supply wire 3 / 6 is connected to the first common terminal KP1, and power supply wire 1 / 2 is connected to the second common terminal KP2. When the first DIP switch SW1 is turned up, the first conversion signal S1 is at a high level, the relay coil is energized and generates magnetic force, thereby attracting the first common terminal KP1 and the second common terminal KP2 to connect to the first normally open terminal KO1 and the second normally open terminal KO2 respectively. At this time, 1 / 2 is connected to the positive power supply V+, and 3 / 6 is used as the negative power supply V-. When the first DIP switch SW1 is turned off, the first conversion signal S1 is at a low level, the relay coil is de-energized, the first common terminal KP1 and the second common terminal KP2 fall back and are connected to the first normally closed terminal KC1 and the second normally closed terminal KC2 respectively. At this time, 1 / 2 is connected to the positive power supply V+, and 3 / 6 is used as the negative power supply V-. The power supply sequence is thus adjusted.

[0030] On the other hand, the conversion signal generation circuit SC also includes a pull-down resistor RP. The DIP switch SW is electrically connected to one end of the relay coil and is also grounded through the pull-down resistor RP. The pull-down resistor RP is used to keep the circuit at a low level when the DIP switch SW is closed, to protect the circuit. In this embodiment, the preferred resistance value of the pull-down resistor RP is 10KR.

[0031] On the other hand, the conversion signal production circuit SC also includes a first current-limiting resistor R1, which is electrically connected between the drive voltage source VC and the DIP switch SW. In this embodiment, the preferred value of the first current-limiting resistor is 1KR.

[0032] On the other hand, in this embodiment, the regulating circuit also includes a freewheeling diode D, which is electrically connected to both ends of the relay coil. The function of the freewheeling diode D is to suppress the generation of back electromotive force when the current in the relay coil is cut off, thus protecting the relay coil and other components in the circuit from damage by high voltage.

[0033] On the other hand, in this embodiment, the regulating circuit further includes a second current-limiting resistor R2, which is electrically connected between the conversion signal generation circuit SC and the relay coil. In this embodiment, the preferred resistance value of the second current-limiting resistor is 100R.

[0034] In summary, the adjustment circuit of this invention allows for easy adjustment of the power supply sequence in a PoE system. This adjustment circuit employs an intuitive and easy-to-implement circuit layout, has low production costs, and offers extremely high flexibility and adaptability. It perfectly matches all PoE power supply sequence standards currently available on the market. Regardless of the type of PoE device or network architecture, this adjustment circuit provides stable and efficient power transmission without compatibility issues. This broad compatibility greatly facilitates users and reduces the cost of replacing equipment or upgrading networks.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the scope of the present utility model application shall still fall within the scope of the present utility model.

Claims

1. An adjustment circuit for adjusting the power supply line sequence of a PoE system, characterized in that, include: A changeover switch, used to switch the power supply line sequence of the PoE system; A conversion signal generation circuit is used to generate a corresponding conversion signal according to the power receiving sequence of the power receiving device. The conversion signal is used to control the state of the conversion switch. The conversion signal generation circuit is electrically connected to the conversion switch.

2. The adjustment circuit for adjusting the power supply line sequence of a PoE system according to claim 1, characterized in that, The PoE system includes a positive power supply and at least one pair of power supply lines. The changeover switch includes a relay. The common terminal of the relay is electrically connected to the power supply line pair. The normally open terminal of the relay is electrically connected to the positive power supply. One end of the relay coil is used to receive the changeover signal, and the other end of the relay coil is grounded.

3. The adjustment circuit for adjusting the power supply line sequence of a PoE system according to claim 2, characterized in that, The common terminal of the relay includes a first common terminal and a second common terminal; the normally open terminal of the relay includes a first normally open terminal and a second normally open terminal; and the normally closed terminal of the relay includes a first normally closed terminal and a second normally closed terminal. The first common terminal is electrically connected to one of the power supply lines in the pair of power supply lines, the second common terminal is electrically connected to the other power supply line in the pair of power supply lines, the first normally closed terminal and the second normally open terminal are respectively electrically connected to the positive power supply terminal, and the second normally closed terminal and the first normally open terminal are connected to serve as the negative power supply terminal of the POE system.

4. The adjustment circuit for adjusting the power supply line sequence of a PoE system according to claim 2, characterized in that, The conversion signal generation circuit includes a driving voltage source and a DIP switch. The driving voltage source is electrically connected to one end of the DIP switch, and the other end of the DIP switch is electrically connected to one end of the coil of the relay.

5. The adjustment circuit for adjusting the power supply line sequence of a PoE system according to claim 4, characterized in that, The conversion signal generation circuit also includes a pull-down resistor, and the DIP switch is electrically connected to one end of the relay coil and is also grounded through the pull-down resistor.

6. The adjustment circuit for adjusting the power supply line sequence of a PoE system according to claim 4, characterized in that, The conversion signal production circuit further includes a first current-limiting resistor, which is electrically connected between the drive voltage source and the DIP switch.

7. The adjustment circuit for adjusting the power supply line sequence of a PoE system according to claim 2, characterized in that, It also includes a freewheeling diode, which is electrically connected to both ends of the coil of the relay.

8. The adjustment circuit for adjusting the power supply line sequence of a PoE system according to claim 2, characterized in that, It also includes a second current-limiting resistor, which is electrically connected between the conversion signal generation circuit and the coil of the relay.

Images