CN115459431A - Universal PoE power supply system for switch - Google Patents

Universal PoE power supply system for switch Download PDF

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Publication number
CN115459431A
CN115459431A CN202210908941.XA CN202210908941A CN115459431A CN 115459431 A CN115459431 A CN 115459431A CN 202210908941 A CN202210908941 A CN 202210908941A CN 115459431 A CN115459431 A CN 115459431A
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CN
China
Prior art keywords
power supply
module
resistor
load equipment
detection
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Pending
Application number
CN202210908941.XA
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Chinese (zh)
Inventor
刘如成
张子扬
唐兴刚
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Sichuan Tianyi Comheart Telecom Co Ltd
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Sichuan Tianyi Comheart Telecom Co Ltd
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Application filed by Sichuan Tianyi Comheart Telecom Co Ltd filed Critical Sichuan Tianyi Comheart Telecom Co Ltd
Priority to CN202210908941.XA priority Critical patent/CN115459431A/en
Publication of CN115459431A publication Critical patent/CN115459431A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00036Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
    • H02J13/0004Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02Details
    • H02H3/06Details with automatic reconnection
    • H02H3/066Reconnection being a consequence of eliminating the fault which caused disconnection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention discloses a universal PoE power supply system for a switch, which adopts a universal control processor to realize a low-cost PoE power supply system. The power supply voltage detection function is realized, and the energy loss of the system is reduced by adopting a low-conduction internal resistance P-type MOS tube; the method can realize that no direct current voltage exists on the Ethernet line when no PD load equipment exists, and the condition of burning the equipment which is not installed and distributed with the network cannot occur; the system has the functions of PD load equipment current detection, management of power consumption information of PD load equipment connected with the system, port priority adjustment of the PD load equipment, port current limiting of the PD load equipment, automatic port overcurrent protection of the PD load equipment, input voltage short-circuit protection, lightning stroke protection module of a power supply port and interactive processing interface, and provides information flow of the PD load equipment mounted on the system to a management terminal to realize dynamic monitoring/management. The invention has the characteristics of low cost, simple circuit realization and perfect protection.

Description

Universal PoE power supply system for switch
Technical Field
The invention relates to the field of PoE power supply, in particular to a universal PoE power supply system for a switch.
Background
The existing PoE technology direction is as follows: the special PSE chip realizes PoE power supply; using MCU to control and simulate to realize PoE power supply; the price of the special PSE chip is not good, most of the current manufacturers of the special PSE chip are foreign suppliers, and the PSE chip is also influenced under the condition that the current IC chip is out of stock, so that the product development and the product delivery are seriously influenced. The invention adopts a general control processor scheme to realize the PoE power supply function, is not limited by PSE capacity at all, and can obviously reduce the product cost by adopting a general architecture.
At present, a nonstandard PoE scheme for realizing PoE power supply by adopting single-chip microcomputer control simulation exists in the market, and products of the type often do not have complete protection measures and can have the problems of short circuit, equipment burning and high failure rate; such non-standard PoE products often directly provide a voltage of 12V or other specifications for directly detecting PD load devices, which will always exist on the power supply line, and if not connected to a network terminal, terminal devices are easily burned; the nonstandard PoE scheme usually uses an N-type MOS tube to control power supply, and the internal resistance of the N-type MOS tube is larger according to the characteristics of the N-type MOS tube, so that the self consumption is larger, the power is wasted, the self heating is serious, and even under the condition that a PD load device is short-circuited, the N-type MOS tube can be burnt. And burning the PD terminal equipment.
Aiming at the problems that the non-standard PoE power supply scheme adopted in the related technology cannot avoid possible damage to non-distribution network terminal equipment and an effective solution is not provided for the possible situation of burning of the self equipment.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a universal PoE power supply system for a switch, which comprises a power supply module, a power supply short-circuit protection module, a PD load device port protection module, a power supply voltage detection module, a PD load device detection/handshake module, a control signal driving module, a PD load device power supply control switch, a PD load device overcurrent protection module, a PD load device current limiting module, a PD load device current detection module, a control processor module and an interactive processing interface;
the power supply module is used for providing voltage/current required by the system; the power supply positive end of the PD load equipment is connected to the power supply control switch of the PD load equipment; the power supply negative terminal of the PD load equipment is grounded through the current limiting module of the PD load equipment; the PD load equipment port protection module is connected between the power supply port power supply commanders of the PD load equipment module; the detection end of the power supply voltage detection module is connected with the output end of the power supply short-circuit protection module; the detection output end P1 of the power supply voltage detection module is connected with the general processor module; the control output end S1 of the general processor module is connected with the controlled end of the control drive module; the output end S1_ Ctr of the control signal driving module is connected with the controlled end of the power supply control switch of the PD load equipment; the detection end of the PD load equipment detection/handshake module is connected with the output end of the PD load equipment power supply control switch; the detection output end F1 of the PD load equipment detection/handshake module is connected with the control processor module; the current-limiting common node of the current limiting module of the PD load equipment is connected with the detection end of the overcurrent protection module of the PD load equipment; the output end of the overcurrent protection module of the PD load equipment is connected with the control end S1 of the control signal driving module; the current limiting common node of the PD load equipment current limiting module is connected with the detection end of the PD load equipment current detection module; and the detection output end L1 of the PD load equipment current detection module is connected with the general processing module. The general processing module communication interface C1 is connected with the interactive processing interface.
Preferably, the power supply control switch of the PD load device comprises a P-type MOS transistor U1, and a power supply anode VPOS0 of the PD load device module is connected to a drain of the P-type MOS transistor U1; the power supply negative electrode of the PD load equipment module is grounded after passing through the current-limiting common node of the PD load equipment current limiting module; a control signal output end S1_ Ctr of the control signal driving module is connected with a grid electrode of the P-type MOS tube U1; and the source electrode of the P-type MOS tube U1 is connected to the output end of the power supply short-circuit protection module.
Preferably, the power supply short-circuit protection module includes a self-recovery fuse F1, and the self-recovery fuse F1 is connected in series to the output positive line of the power supply module.
Preferably, the control signal driving module includes an NPN type triode Q1, a resistor R5, and a resistor R7; the control processor module power supply control signal S1 is connected with the base electrode of the NPN type triode Q1 through a resistor R5; the resistor R7 is connected with the base electrode of the NPN type triode Q1 and the emitting electrode of the NPN type triode Q1; the emitting electrode of the NPN type triode Q1 is grounded, and the collecting electrode of the NPN type triode Q1 is connected with the controlled end S1_ Ctrl of the power supply control switch of the PD load equipment through the resistor R2.
Preferably, the PD load device overcurrent protection module includes an NPN-type triode Q2, a resistor R11, a resistor R12, and a resistor R24; the current-limiting common node is connected with the base electrode of the NPN type triode Q2 through the R11; the base electrode of the NPN type triode Q2 is grounded through a resistor R12; the collector of the NPN type triode Q2 is connected with a power supply control signal S1 of the control processor module through a resistor R24; the emitter of the NPN transistor Q2 is grounded.
Preferably, the power supply voltage detection module includes a capacitor C2, a resistor R13, a resistor R14, and a resistor R15; one end of the resistor R13 is connected with the output of the power supply short-circuit protection module; the other end of the resistor R13 is connected with a power supply detection signal P1 of the control processor module through a resistor R14; the resistor R15 is connected with one end of the resistor R13 and one end of the capacitor C2; the other ends of the resistor R15 and the capacitor C2 are grounded.
Preferably, the PD load device detection/handshake module includes a P-type MOS transistor Q4, an NPN-type triode Q3, a resistor R17, a resistor R19, a resistor R23, a resistor R20, a resistor R6, a resistor R18, a resistor R21, a resistor R22, and a voltage regulator D5; the grid electrode of the P-type MOS tube Q4 is connected with the output power supply positive electrode of the PD load equipment power supply control switch through a capacitor R17; the grid electrode of the P-type MOS transistor Q4 is connected with the collector electrode of the NPN triode Q3; the resistor R19 is connected in parallel with the grid electrode of the P-type MOS tube Q4 and the source electrode of the P-type MOS tube Q2; the source electrode of the P-type MOS tube Q4 is connected with the output power supply anode of the PD load equipment power supply control switch through a resistor R23; the drain electrode of the P-type MOS tube Q4 is connected with the base electrode of the NPN-type triode Q3; the base of the NPN type triode Q3 is connected to the ground through a resistor R16; an emitter of the NPN type triode Q3 is connected with a PD equipment detection signal F1 of the control processor module through a resistor R20 and a resistor R21; the common point of the resistors R20 and R21 is grounded through a resistor R22; meanwhile, the common point of the resistor R20 and the resistor R21 is connected with the resistor R18 and the resistor R6; and the resistor R6 is connected with the output power supply anode of the PD load equipment power supply control switch through a voltage stabilizing tube D5.
Preferably, the PD load device port protection module includes a capacitor C1, a resistor R3, a unidirectional transient suppression tube D2, and a fast recovery diode D1. The capacitor C1 is connected with the output power supply anode of the PD load equipment power supply control switch; the capacitor C1 is connected with an output power supply cathode NEG _ OUT0 of a power supply control switch of the PD load equipment, and meanwhile, the capacitor C1 is connected with a current-limiting common node of a current limiting module of the PD load equipment through a rectifier diode D4; the resistor R3, the one-way transient suppression tube D2 and the capacitor C1 are connected in parallel; the output supply cathode NEG _ OUT0 is grounded through a fast recovery diode D1.
The invention has the beneficial effects that: (1) The invention only adopts the general processor module and less external passive devices to realize power supply after handshake communication with the PD load equipment, dynamically detects whether the PD load equipment is on-line or not, whether the PD load equipment is legal or not, whether the PD load equipment is off-line or not and whether the PD load equipment is over-power or not, and has the advantages of simple circuit structure, low cost and quick dynamic response on-off of the power supply of the PD load equipment.
(2) When the PD load equipment is off-line, the Ethernet interface has no direct-current voltage and is connected with an unmatched network terminal, and the network terminal cannot be damaged.
(3) Detecting the working current of the PD load equipment through a current limiting module of the PD load equipment to ensure that the PD load equipment works in a preset power range;
(4) The PD load equipment overcurrent protection module automatically detects the working current of the PD load equipment, and when the exceeding threshold current is detected, the PD load equipment overcurrent protection module quickly corresponds to perform effective overcurrent protection on the PD load equipment control switch, the PD load equipment current limiting module and the PD load equipment. The system has the self-recovery characteristic, and when the threshold current returns to normal, the system automatically performs a series of actions such as handshaking, power supply and the like with the PD load equipment.
(5) The implementation system of the application adopts a three-level protection mechanism, can ensure safe work of the PD load equipment and the system, and does not cause irreversible damage to the PD load equipment and the system. First-stage protection: the power supply module supplies power voltage overvoltage and undervoltage detection, the power supply voltage detection module detects whether the power supply voltage is in a standard specification range or not, the power supply voltage is detected to be out of the standard specification range, and the system does not start power supply to the PD load equipment to protect the PD load equipment. And (3) second-stage protection: the power supply module performs short-circuit overcurrent protection, and when the power supply module has a large current condition such as short circuit, the power supply short-circuit protection module starts automatically to protect the application implementation system and the PD load equipment module; and the short-circuit condition of the power supply module is cancelled, and the system is recovered. And (3) third-level protection: the system comprises a PD load device, a second-stage protection module, a PD load device overcurrent protection module and a PD load device module.
(6) And (4) redundancy protection: during the period that the third-level protection is started to take effect, the instantaneous pulse current of the power supply control switch of the PD load equipment possibly exists is adopted, the P-type MOS tube U1 is adopted in the power supply control switch module of the PD load equipment, the P-type MOS tube has the characteristic of low internal resistance, so that the energy consumed by the P-type MOS tube U1 is extremely low, and the P-type MOS tube U1 of the power supply control switch of the PD load equipment is effectively protected.
(7) The three-level protection mechanism and the redundancy protection measure are added, and the system implemented by the application has high reliability and stability.
Drawings
Fig. 1 is a block diagram of a PoE power delivery system implemented in accordance with the present application;
FIG. 2 is a schematic circuit diagram of a PD load device power supply control switch;
FIG. 3 is a schematic circuit diagram of a control signal driver module;
FIG. 4 is a schematic circuit diagram of a PD load device detection/handshake module;
FIG. 5 is a schematic circuit diagram of a supply short protection module;
FIG. 6 is a circuit schematic of a supply voltage detection module;
FIG. 7 is a circuit schematic of a current limiting module of the PD load device;
FIG. 8 is a circuit schematic of a port protection module of the PD load device;
FIG. 9 is a circuit schematic of the control processor module.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
For the purpose of making the object, technical solution and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention. It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
As shown in fig. 1, a general PoE power supply system for a switch includes a power supply module, a power supply short-circuit protection module, a PD load device port protection module, a power supply voltage detection module, a PD load device detection/handshake module, a control signal driving module, a PD load device power supply control switch, a PD load device overcurrent protection module, a PD load device current limit module, a PD load device current detection module, a control processor module, and an interactive processing interface;
the power supply module is used for providing voltage/current required by the system; the power supply positive end of the PD load equipment is connected to the power supply control switch of the PD load equipment; the power supply negative terminal of the PD load equipment is grounded through the current limiting module of the PD load equipment; the PD load equipment port protection module is connected between the power supply port power supply commanders of the PD load equipment module; the detection end of the power supply voltage detection module is connected with the output end of the power supply short-circuit protection module; the detection output end P1 of the power supply voltage detection module is connected with the general processor module; the control output end S1 of the general processor module is connected with the controlled end of the control drive module; the output end S1_ Ctr of the control signal driving module is connected with the controlled end of the power supply control switch of the PD load equipment; the detection end of the PD load equipment detection/handshake module is connected with the output end of the PD load equipment power supply control switch; the detection output end F1 of the PD load equipment detection/handshake module is connected with the control processor module; the current-limiting common node of the current limiting module of the PD load equipment is connected with the detection end of the overcurrent protection module of the PD load equipment; the output end of the overcurrent protection module of the PD load equipment is connected with the control end S1 of the control signal driving module; the current limiting common node of the PD load equipment current limiting module is connected to the detection end of the PD load equipment current detection module; and the detection output end L1 of the PD load equipment current detection module is connected with the general processing module. The general processing module communication interface C1 is connected with the interactive processing interface.
The power supply control switch of the PD load equipment comprises a P-type MOS tube U1, and a power supply anode VPOS0 of a PD load equipment module is connected with a drain electrode of the P-type MOS tube U1; the power supply negative electrode of the PD load equipment module is grounded after passing through the current-limiting common node of the PD load equipment current limiting module; a control signal output end S1_ Ctr of the control signal driving module is connected with a grid electrode of the P-type MOS tube U1; and the source electrode of the P-type MOS tube U1 is connected to the output end of the power supply short-circuit protection module.
The power supply short-circuit protection module comprises a self-recovery fuse F1, and the self-recovery fuse F1 is connected in series on an output positive line of the power supply module.
The control signal driving module comprises an NPN type triode Q1, a resistor R5 and a resistor R7; the control processor module power supply control signal S1 is connected with the base electrode of the NPN type triode Q1 through a resistor R5; the resistor R7 is connected with the base electrode of the NPN type triode Q1 and the emitting electrode of the NPN type triode Q1; the emitting electrode of the NPN type triode Q1 is grounded, and the collecting electrode of the NPN type triode Q1 is connected with the controlled end S1_ Ctrl of the power supply control switch of the PD load equipment through the resistor R2.
The PD load equipment overcurrent protection module comprises an NPN type triode Q2, a resistor R11, a resistor R12 and a resistor R24; the current-limiting common node is connected with the base electrode of the NPN type triode Q2 through the R11; the base electrode of the NPN type triode Q2 is grounded through a resistor R12; the collector of the NPN type triode Q2 is connected with a power supply control signal S1 of the control processor module through a resistor R24; the emitter of the NPN transistor Q2 is grounded.
The power supply voltage detection module comprises a capacitor C2, a resistor R13, a resistor R14 and a resistor R15; one end of the resistor R13 is connected with the output of the power supply short-circuit protection module; the other end of the resistor R13 is connected with a power supply detection signal P1 of the control processor module through a resistor R14; the resistor R15 is connected with one end of the resistor R13 and one end of the capacitor C2; the other ends of the resistor R15 and the capacitor C2 are grounded.
The PD load equipment detection/handshake module comprises a P-type MOS tube Q4, an NPN-type triode Q3, a resistor R17, a resistor R19, a resistor R23, a resistor R20, a resistor R6, a resistor R18, a resistor R21, a resistor R22 and a voltage regulator tube D5; the grid electrode of the P-type MOS tube Q4 is connected with the output power supply positive electrode of the PD load equipment power supply control switch through a capacitor R17; the grid electrode of the P-type MOS tube Q4 is connected with the collector electrode of the NPN triode Q3; the resistor R19 is connected in parallel with the grid electrode of the P-type MOS tube Q4 and the source electrode of the P-type MOS tube Q2; the source electrode of the P-type MOS tube Q4 is connected with the output power supply anode of the PD load equipment power supply control switch through a resistor R23; the drain electrode of the P-type MOS tube Q4 is connected with the base electrode of the NPN-type triode Q3; the base of the NPN type triode Q3 is connected to the ground through a resistor R16; an emitter of the NPN type triode Q3 is connected with a PD equipment detection signal F1 of the control processor module through a resistor R20 and a resistor R21; the common point of the resistors R20 and R21 is grounded through a resistor R22; meanwhile, a common point of the resistor R20 and the resistor R21 is connected with the resistor R18 and the resistor R6; and the resistor R6 is connected with the output power supply anode of the PD load equipment power supply control switch through a voltage stabilizing tube D5.
The PD load equipment port protection module comprises a capacitor C1, a resistor R3, a unidirectional transient suppression tube D2 and a fast recovery diode D1. The capacitor C1 is connected with the output power supply anode of the PD load equipment power supply control switch; the capacitor C1 is connected with an output power supply cathode NEG _ OUT0 of the PD load equipment power supply control switch, and meanwhile, the capacitor C1 is connected with a current-limiting common node of the PD load equipment current limiting module through a rectifier diode D4; the resistor R3, the one-way transient suppression tube D2 and the capacitor C1 are connected in parallel; the output supply cathode NEG _ OUT0 is grounded through a fast recovery diode D1.
Specifically, the universal PoE power supply system comprises a power supply short-circuit protection module 2, a PD load device port protection module 3, a power supply voltage detection module 5, a PD load device detection/handshake module 6, a control signal driving module 7, a PD load device power supply control switch 8, a PD load device overcurrent protection module 9, a PD load device current limiting module 10, a PD load device current detection module 11, a control processor module 12, and an interactive processing interface 13.
The power supply module 1 is used for providing a +54V direct-current power supply for the whole system, and the power supply module 1 is connected to the power supply short-circuit protection module 2; the power supply voltage of the power supply short-circuit protection module 2 is connected to the input end P1 of the control processor module 12 through the power supply voltage detection module 5; the power supply voltage passing through the power supply short-circuit protection module 2 is connected to the power supply control input end of the PD load equipment control switch 8; the power supply output voltage of the PD load device control switch 8 is connected to the PD load device module 4 through the PD load device port protection module 3, and the power supply output voltage of the PD load device control switch 8 is connected to the handshake detection input terminal F1 of the control processor module 12 through the PD load device detection/handshake module 6; the controlled terminal of the PD load device control switch 8 is connected to the control output terminal S1_ Ctr of the control signal driving module 7. The controlled end of the control signal driving module 7 respectively controls the power supply switch control end S1 of the processor module 12 to be connected with the overcurrent control output end of the PD load equipment overcurrent protection module 9; the overcurrent detection end of the PD load device overcurrent protection module 9 is connected to the current-limiting common node of the PD load device current limiting module 10; the power supply negative electrode of the PD load equipment module 4 passes through the PD load equipment current limiting module 10 and then is grounded; the current-limiting common node of the PD load device current limiting module 10 is connected to the current detection input to the PD load device current detection module 11; the output end of the PD load device current detection module 11 is connected to the current detection end L1 of the control processor module 12; the interactive processing interface C1 of the control processor module 12 is reserved for communication with an upper management system.
As shown in fig. 2, the PD load device power supply control switch 8 includes a P-type MOS transistor U1. The power supply output of the power supply short-circuit protection module 2 is connected with the source electrode of the P-type MOS tube U1; the drain of the P-type MOS transistor U1 is connected to the power supply positive electrode Vpos0 of the PD load device module 4 through the PD load device port protection module 3. A control signal S1_ Ctr of the control signal driving module 7 is connected with a grid electrode of the P-type MOS tube U1;
as shown in fig. 3, the control signal driving module 7 includes an NPN transistor Q1. The base electrode of the NPN type triode Q1 is connected with a control signal S1 of the control processor module 12 through a resistor R5;
as shown in fig. 4, the PD load device detection/handshake module 6 includes a P-type MOS transistor Q4 and an NPN-type transistor Q3. The grid electrode of the P-type MOS tube Q4 is connected with the output end VPOS0 of the PD load equipment power supply control switch 8 through a resistor R17; the drain electrode of the P-type MOS tube Q4 is connected with the base electrode of the NPN-type triode Q3; an emitter of the NPN type triode Q3 is connected with a detection signal F1 of the control processor module 12 through resistors R20 and R21; the voltage regulator tube D5, the resistor R6, the resistor R19, and the resistor R22 form a detection circuit of the PD load device detection/handshake module 6.
As shown in fig. 5, the supply short-circuit protection module 2 is composed of a self-recovery fuse F1.
As shown in fig. 6, the supply voltage detection module 5 includes a resistor R13, a resistor R14, a resistor R15, and a capacitor C2.
Specifically, as shown in fig. 7, the PD load device current limiting module 10 includes resistors R9, R10. The PD load device overcurrent protection module 9 includes an NPN-type triode Q2, and resistors R11, R12, and R24; the base electrode of the NPN type triode Q2 is connected with the current-limiting common node through a resistor R11, and the collector electrode of the NPN type triode Q2 is connected with the control end S1 of the control signal driving module 7 through a resistor R24; an emitting electrode of the NPN type triode Q2 is grounded; the PD load device current detection module 11 includes a resistor R8.
As shown in fig. 8, the PD load device port protection module 3 includes a capacitor C1, a resistor R3, a unidirectional transient suppressor D2, and a fast recovery diode D1, and is used for protection against lightning.
As shown in fig. 9, the control processor module 12 includes a processor module U3. The control processor 12 includes an external interactive processing interface 13.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (8)

1. A universal PoE power supply system for a switch is characterized by comprising a power supply module, a power supply short-circuit protection module, a PD load device port protection module, a power supply voltage detection module, a PD load device detection/handshake module, a control signal driving module, a PD load device power supply control switch, a PD load device overcurrent protection module, a PD load device current limiting module, a PD load device current detection module, a control processor module and an interactive processing interface;
the power supply module is used for providing voltage/current required by the system; the power supply positive end of the PD load equipment is connected to the power supply control switch of the PD load equipment; the power supply negative terminal of the PD load equipment is grounded through the PD load equipment current limiting module; the PD load equipment port protection module is connected between the power supply port power supply commanders of the PD load equipment module; the detection end of the power supply voltage detection module is connected with the output end of the power supply short-circuit protection module; the detection output end P1 of the power supply voltage detection module is connected with the general processor module; the control output end S1 of the general processor module is connected with the controlled end of the control drive module; the output end S1_ Ctr of the control signal driving module is connected with the controlled end of the power supply control switch of the PD load equipment; the detection end of the PD load equipment detection/handshake module is connected with the output end of the PD load equipment power supply control switch; the detection output end F1 of the PD load equipment detection/handshake module is connected with the control processor module; a current-limiting common node of the PD load equipment current limiting module is connected with a detection end of the PD load equipment overcurrent protection module; the output end of the overcurrent protection module of the PD load equipment is connected with the control end S1 of the control signal driving module; the current limiting common node of the PD load equipment current limiting module is connected to the detection end of the PD load equipment current detection module; and the detection output end L1 of the PD load equipment current detection module is connected with the general processing module. The general processing module communication interface C1 is connected with the interactive processing interface.
2. The universal PoE power supply system for the switch as claimed in claim 1, wherein the PD load device power supply control switch comprises a P-type MOS transistor U1, and the power supply positive electrode VPOS0 of the PD load device module is connected to the drain of the P-type MOS transistor U1; the power supply negative electrode of the PD load equipment module is grounded after passing through the current-limiting common node of the PD load equipment current limiting module; a control signal output end S1_ Ctr of the control signal driving module is connected with a grid electrode of the P-type MOS tube U1; and the source electrode of the P-type MOS tube U1 is connected to the output end of the power supply short-circuit protection module.
3. A universal PoE power supply system for switch as claimed in claim 2, characterized in that said power supply short circuit protection module comprises a self-recovery fuse F1, the self-recovery fuse F1 being connected in series to the output positive line of the power supply module.
4. A universal PoE power supply system for a switch as claimed in claim 3, wherein said control signal driving module comprises NPN transistor Q1, resistor R5, resistor R7; a power supply control signal S1 of the control processor module is connected with a base electrode of an NPN type triode Q1 through a resistor R5; the resistor R7 is connected with the base electrode of the NPN type triode Q1 and the emitting electrode of the NPN type triode Q1; the emitting electrode of the NPN type triode Q1 is grounded, and the collecting electrode of the NPN type triode Q1 is connected with the controlled end S1_ Ctrl of the power supply control switch of the PD load equipment through the resistor R2.
5. A PoE power supply system for a switch as recited in claim 4, wherein said PD load device overcurrent protection module comprises NPN transistor Q2, resistor R11, resistor R12, resistor R24; the current-limiting common node is connected with the base electrode of the NPN type triode Q2 through the R11; the base electrode of the NPN type triode Q2 is grounded through a resistor R12; a collector of the NPN type triode Q2 is connected with a power supply control signal S1 of the control processor module through a resistor R24; the emitter of the NPN transistor Q2 is grounded.
6. A universal PoE power supply system for switches according to claim 5 wherein said supply voltage detection module comprises capacitor C2, resistor R13, resistor R14, resistor R15; one end of the resistor R13 is connected with the output of the power supply short-circuit protection module; the other end of the resistor R13 is connected with a power supply detection signal P1 of the control processor module through a resistor R14; the resistor R15 is connected with one end of the resistor R13 and one end of the capacitor C2; the other ends of the resistor R15 and the capacitor C2 are grounded.
7. The universal PoE power supply system for the switch according to claim 6, wherein said PD load device detection/handshake module comprises P-type MOS transistor Q4, NPN transistor Q3, resistor R17, resistor R19, resistor R23, resistor R20, resistor R6, resistor R18, resistor R21, resistor R22, and zener D5; the grid electrode of the P-type MOS tube Q4 is connected with the output power supply positive electrode of the PD load equipment power supply control switch through a capacitor R17; the grid electrode of the P-type MOS tube Q4 is connected with the collector electrode of the NPN triode Q3; the resistor R19 is connected in parallel with the grid electrode of the P-type MOS tube Q4 and the source electrode of the P-type MOS tube Q2; the source electrode of the P-type MOS tube Q4 is connected with the output power supply anode of the PD load equipment power supply control switch through a resistor R23; the drain electrode of the P-type MOS tube Q4 is connected with the base electrode of the NPN-type triode Q3; the base of the NPN type triode Q3 is connected to the ground through a resistor R16; an emitter of the NPN type triode Q3 is connected with a PD equipment detection signal F1 of the control processor module through a resistor R20 and a resistor R21; the common point of the resistors R20 and R21 is grounded through a resistor R22; meanwhile, the common point of the resistor R20 and the resistor R21 is connected with the resistor R18 and the resistor R6; and the resistor R6 is connected with the output power supply anode of the PD load equipment power supply control switch through a voltage-regulator tube D5.
8. A universal PoE power supply system for a switch as claimed in claim 7 wherein said PD load device port protection module comprises capacitor C1, resistor R3, unidirectional transient suppression tube D2, fast recovery diode D1. The capacitor C1 is connected with the output power supply anode of the PD load equipment power supply control switch; the capacitor C1 is connected with an output power supply cathode NEG _ OUT0 of the PD load equipment power supply control switch, and meanwhile, the capacitor C1 is connected with a current-limiting common node of the PD load equipment current limiting module through a rectifier diode D4; the resistor R3, the one-way transient suppression tube D2 and the capacitor C1 are connected in parallel; the output supply cathode NEG _ OUT0 is grounded through a fast recovery diode D1.
CN202210908941.XA 2022-07-29 2022-07-29 Universal PoE power supply system for switch Pending CN115459431A (en)

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Application Number Priority Date Filing Date Title
CN202210908941.XA CN115459431A (en) 2022-07-29 2022-07-29 Universal PoE power supply system for switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210908941.XA CN115459431A (en) 2022-07-29 2022-07-29 Universal PoE power supply system for switch

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CN115459431A true CN115459431A (en) 2022-12-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118118446A (en) * 2024-04-30 2024-05-31 中孚安全技术有限公司 Switch and switch system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118118446A (en) * 2024-04-30 2024-05-31 中孚安全技术有限公司 Switch and switch system

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