CN109613450A - PSE detection management circuit and its working method - Google Patents
PSE detection management circuit and its working method Download PDFInfo
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- CN109613450A CN109613450A CN201910018935.5A CN201910018935A CN109613450A CN 109613450 A CN109613450 A CN 109613450A CN 201910018935 A CN201910018935 A CN 201910018935A CN 109613450 A CN109613450 A CN 109613450A
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- 238000007726 management method Methods 0.000 description 29
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- 230000000087 stabilizing effect Effects 0.000 description 4
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency 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
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Abstract
The invention belongs to field of power management, specifically, providing a kind of PSE detection management circuit and its working method, wherein PSE detection management circuit, comprising: A/D converter controller, PD detection output module, the first power module and second power supply module；When the PD detection output module is further adapted for detecting PD equipment short circuit, detecting output module to control the second power supply module stopping by the PD by the A/D converter controller is that the PD equipment is powered；First power module and the separation of the power supply of the second power supply module.Motherboard power supply and PD power supply are separated, it is powered with two independent power supplys, reduce interference from each other, simultaneously, when monitoring PD equipment short circuit, in time to the power supply of PD equipment, the generation of high current is prevented, the electronic component for avoiding damage PSE management does not influence other channels normal work.
Description
Technical field
The present invention relates to field of power management, in particular to a kind of PSE detection management circuit and its working method.
Background technique
PSE management at present is all based on dedicated asic chip, such as U.S. letter (MAX5980), TI (TPS23861),
Microsemi ' s (PD69104B) etc., and configure deficiency is managed if you need to the PSE in 2 channel, 3 channel, not specific to
The model answered can only use the ASIC in 4 channels.For these chips what is common is that at high cost, some models fever is big.Moreover, PSE
Only one general supply of the power supply of management, general supply can generate mutually interference, concussion etc. when powering to mainboard and PD.And
And when being powered to PD equipment, it may appear that the generation of short-circuit state can generate high current when PD equipment short circuit, damage
The electronic component of PSE management, while influencing whether that other channels work normally, a PSE chip is responsible for the management in 4 channels,
It is also possible to burning apparatus power supply, it, can be because equipment power supply burns initiation fire when serious.
How to solve the above problems, is urgently to be resolved at present.
Summary of the invention
The object of the present invention is to provide a kind of PSE detection management circuit and its working methods.
To achieve the goals above, The technical solution adopted by the invention is as follows:
The present invention provides a kind of PSE detection management circuits, comprising: A/D converter controller and A/D converter controller are electrical
Connection PD detection output module, for A/D converter controller power supply the first power module and be PD equipment power supply second
Power module；
When the PD detection output module is adapted to detect for PD equipment, the A/D converter controller passes through PD detection output
It is that the PD equipment is powered that module, which controls the second power supply module,；
When the PD detection output module is further adapted for detecting PD equipment short circuit, passed through by the A/D converter controller described
It is that the PD equipment is powered that PD, which detects output module and controls the second power supply module stopping,；
First power module and the separation of the power supply of the second power supply module.
In the present invention, PD detection output module includes PD featured resistance detection sub-module and for electric drive submodule
Block；
The PD featured resistance detection sub-module and the power supply driven submodule are electric with the A/D converter controller respectively
Property connection；
When the PD featured resistance detection sub-module detects PD equipment, the A/D converter controller is detected by the PD
It is that the PD equipment is powered that output module, which controls the second power supply module,.
In the present invention, the power supply driven submodule includes switching tube U5 and switching tube Q4；
The first pole of the switching tube U5 and the cathode OUT1- of the second power supply module are electrically connected；
The second pole of the switching tube U5 and the first pole of the switching tube Q4 are electrically connected；
The third pole of the switching tube U5 is grounded；
The first pole of the switching tube Q4 and the anode of the second power supply module are electrically connected；
The second pole of the switching tube Q4 and the control terminal of the A/D converter controller are electrically connected；
The third pole of the switching tube Q4 is grounded；
The A/D converter controller ends suitable for control switch pipe Q4, so that the second pole of switching tube U5 be drawn high, makes to switch
Pipe U5 conducting starts so that the cathode OUT1- of the second power supply module is grounded as PD equipment power supply.
In the present invention, the PD detection output module further includes output power feedback submodule；
The output power feedback submodule further includes resistance R44, resistance R48 and resistance R49；
It is grounded after the resistance R48 is in parallel with the resistance R49；
One end of the resistance R44 after resistance R48, the resistance R49 after parallel connection by being grounded；
The other end of the resistance R44 and the feedback end of the A/D converter controller are electrically connected；
The third pole of the switching tube U5 is electrically connected at the resistance R48 after the resistance R44 and parallel connection, between resistance R49,
And it is grounded by resistance R48 and resistance R49；
The A/D converter controller is further adapted for detecting the function of PD equipment by the resistance R44, resistance R48 and resistance R49
Rate, and the power received is compared with predetermined power, if the power received is greater than predetermined power, pass through the mould
The control terminal control switch pipe Q4 conducting of number switching controller is completed the stopping to PD equipment and is supplied so that switching tube U5 be ended
It is electrically operated.
In the present invention, the switching tube U5 is N-channel MOS FET pipe.
In the present invention, the PD detection output module further includes overcurrent protection submodule；
The overcurrent protection submodule includes adjustment pipe Q6, resistance R42 and current sense resistor；
The third pole of the switching tube U5 is grounded by the current sense resistor；
The first pole of the adjustment pipe Q6 and the second pole of switching tube U5 are electrically connected；
The second pole of the adjustment pipe Q6 is electrically connected by the third pole of the resistance R42 and switching tube U5；
The third pole ground connection of the adjustment pipe Q6；
When switching tube U5 is connected, the first pole of adjustment pipe Q6 be in low level, by the electric current of switching tube U5 by resistance R42 with
Current sense resistor flows into the second pole of adjustment pipe Q6 after being shunted, adjust the voltage of the second pole of pipe Q6 as electric current increases
And increase, when adjusting conducting voltage of the voltage of the second pole of pipe Q6 equal to adjustment pipe Q6, adjustment pipe Q6 is in half and shape is connected
State drags down the third pole tension of switching tube U5, to the electric current of switching tube U5 be reduced, when the electricity of the second pole of adjustment pipe Q6
When pressure is less than the conducting voltage of adjustment pipe Q6, adjustment pipe Q6 cut-off, to play metering function.
In the present invention, the resistance value of the current sense resistor is 0.75 ohm.
The present invention also provides a kind of working method of PSE detection management system, the work of the PSE detection management system
Method is by stopping as PD equipment power supply when detecting the short circuit of PD equipment, offline, overload.
In the present invention, described when detecting the short circuit of PD equipment, offline, overload, stop the side powering for the PD equipment
Method includes:
Resistance R1, diode D5 output electric current measure voltage, A/D converter controller detect the characteristic impedance of PD equipment；
Characteristic impedance is greater than the first preset value and when less than the second preset value, indicates that PD equipment is effective, i.e., control switch pipe U5 is
The power supply of PD equipment；
The power that the feedback end of A/D converter controller receives is less than 0.25W, at this time PD equipment off-line, and control switch pipe U5 is cut
Only, stop as the power supply of PD equipment；
The received power of the feedback end of A/D converter controller is greater than predetermined power, at this point, PD apparatus overload, control switch pipe U5
Cut-off stops as the power supply of PD equipment, A/D converter controller from the electric current of detection switch pipe U5 be maximum current to control switch
The range of the processing time of pipe U5 cut-off is 1-4mS.
In the present invention, described when detecting the short circuit of PD equipment, offline, overload, stop the side powering for the PD equipment
Method further include:
The maximum current for passing through switching tube U5 by the limitation of current limliting constant-current source, thus the drain voltage of limit switch pipe U5；
The detection pin of the drain voltage of A/D converter controller detection switch pipe U5 is the IO foot inputted with schmidt trigger,
Control switching tube U5 cut-off when the drain voltage for detecting switching tube U5 is high level stops as PD equipment power supply；
A/D converter controller is from detecting that the drain voltage of switching tube U5 is the processing that ends to control switch pipe U5 of high level
The range of time is 2-8uS.
Compared with the existing technology, the embodiment of the present invention has the advantages that
The present invention provides a kind of PSE detection management circuit and its working methods, wherein PSE detection management circuit, comprising: mould
Switching controller is counted, output module is detected with the PD that A/D converter controller is electrically connected, is powered for A/D converter controller
First power module and the second power supply module powered for PD equipment；The PD detection output module is adapted to detect for PD equipment
When, the A/D converter controller by the PD detect output module control the second power supply module be the PD equipment into
Row power supply；When the PD detection output module is further adapted for detecting PD equipment short circuit, passed through by the A/D converter controller
The PD detection output module, which controls the second power supply module, to be stopped being that the PD equipment is powered；First power module with
And the power supply separation of the second power supply module.PSE management is done using A/D converter controller, at low cost, configuration is convenient, together
When motherboard power supply and PD power supply are separated, be powered with two independent power supplys, reduce interference from each other,
Meanwhile when monitoring PD equipment short circuit, stop the power supply to PD equipment in time, prevent the generation of high current, avoids damage PSE
The electronic component of management does not influence other channels normal work.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 shows the functional block diagram of PSE electric power management circuit provided by the embodiment of the present invention.
Fig. 2 shows PD provided by the embodiment of the present invention to detect the even fast functional block diagram of output evil spirit.
Fig. 3 shows the circuit diagram of A/D converter controller provided by the embodiment of the present invention.
Fig. 4 shows the partial circuit diagram of the detection output module of PD provided by the embodiment of the present invention.
Fig. 5 shows another part circuit diagram of the detection output module of PD provided by the embodiment of the present invention.
In figure: 110- A/D converter controller；120-PD detects output module；121-PD featured resistance detection sub-module；
122- power supply driven submodule；123- output power feeds back submodule；124- circuit protection submodule；130- the first power supply mould
Block；140- second power supply module.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.These attached drawings are simplified schematic diagram, only with
Illustration illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.
Referring to Fig. 1, the embodiment of the invention provides a kind of PSE detection management circuit, i.e. power supply unit (Power
Sourcing Equipment, PSE) detection management circuit, PSE detection management circuit include: A/D converter controller 110, with
The first electricity that the PD that A/D converter controller 110 is electrically connected detects output module 120, powers for A/D converter controller 110
Source module 130 and the second power supply module 140 powered for power receiving equipment (Power Device, PD)；The PD detection output
When module 120 is adapted to detect for PD equipment, the A/D converter controller 110 detects output module 120 by the PD and controls
The second power supply module 140 is that the PD equipment is powered；The PD detection output module 120 is further adapted for detecting that PD is set
When standby short circuit, output module 120 is detected by the PD by the A/D converter controller 110 and controls the second source mould
Block 140 stops being that the PD equipment is powered；First power module 130 and the power supply of the second power supply module 140 point
From.PSE management is done using A/D converter controller 110, at low cost, configuration is convenient, while motherboard power supply and PD power supply is electric
Source separates, and is powered with two independent power supplys, reduces interference from each other.Meanwhile when monitoring that PD equipment is short
Lu Shi, the power supply to PD equipment is stopped, preventing the generation of high current in time, avoids the electronic component of damage PSE management, does not influence
Other channels work normally.
In the present embodiment, first power module 130 includes voltage stabilizing chip and the first power supply；The voltage stabilizing chip
Suitable for the A/D converter controller 110 will be transferred to after the first power supply pressure stabilizing；Wherein, the model of voltage stabilizing chip
The circuit diagram of XL7005A, A/D converter controller 110 are as shown in Figure 3.
The second power supply module 140 includes voltage conversion chip and second source；The voltage conversion chip is suitable for
PD equipment power supply is given after the second source is converted to direct current.
Wherein, the voltage that voltage conversion chip is suitable for converting low-voltage direct alternating current source to 48V is powered for rear end PD equipment.
In the present embodiment, it is four that PD, which detects the quantity of output module 120, and it is logical to can satisfy 2 channels, 3 channels and 4
The PSE in road is managed.
Referring to Fig. 2, the PD detection output module 120 includes that PD featured resistance detection sub-module 121 and power supply are driven
Mover module 122；The PD featured resistance detection sub-module 121 and the power supply driven submodule 122 respectively with the mould
Number switching controller 110 is electrically connected；When the PD featured resistance detection sub-module 121 detects PD equipment, the modulus
Switching controller 110 detects output module 120 by the PD and controls the second power supply module 140 as PD equipment progress
Power supply.
Wherein, featured resistance detection sub-module includes resistance R39, resistance R38, and the cathode of second power supply module 140 is successively
It is grounded by resistance R38, resistance R39, the signal input part T1 of analog-to-digital conversion control is electrically connected resistance R38 and resistance R39
Between, when the access of PD equipment, the cathode of second power supply module 140 has voltage, the signal input part T1 prison of analog-to-digital conversion control
Electric current is measured, it is that the PD equipment is supplied that the driven submodule 122 of control power supply at this time, which controls the second power supply module 140,
Electricity.When the end T1 monitors that electric current is greater than preset value, at this point, PD equipment short circuit, control power supply driven submodule 122 control second
Power module 140 stops being that PD equipment is powered.The current time that A/D converter controller detects is Microsecond grade, does not influence PSE
The normal use of detection management circuit improves product reliability and safety.
Specifically, the power supply driven submodule 122 includes switching tube U5 and switching tube Q4；The of the switching tube U5
The cathode of one pole and the second power supply module 140 is electrically connected；The second pole of the switching tube U5 is with the switching tube Q4's
First pole is electrically connected；The third pole of the switching tube U5 is grounded；The first pole of the switching tube Q4 and the second source mould
The anode of block 140 is electrically connected；The control terminal K1 of the second pole of the switching tube Q4 and the A/D converter controller 110 is electrical
Connection；The third pole of the switching tube Q4 is grounded；The A/D converter controller 110 ends suitable for control switch pipe Q4, thus
The second pole of switching tube U5 is drawn high, switching tube U5 is connected, so that the cathode of the second power supply module 140 is grounded, is opened
Begin to be that the PD equipment is powered.
Wherein, switching tube Q4 is NPN triode, and high level is connected, low level cut-off, the extremely C of the first of switching tube Q4, the
Two extremely B, third extremely E.The switching tube U5 is N-channel MOS FET pipe, model FDS3126, high level conducting, low electricity
It is truncate only, 5678 pins of U5 in the extremely S(figure of the first of switching tube U5), 4 pins of the second U5 extremely in G(figure), third pole
For 123 pins of U5 in D(figure).
In the present embodiment, the PD detection output module 120 further includes output power feedback submodule 123；It is described defeated
Feedback of Power submodule 123 further includes resistance R44, resistance R48 and resistance R49 out；The resistance R48 and resistance R49
It is grounded after parallel connection；One end of the resistance R44 after resistance R48, the resistance R49 after parallel connection by being grounded；The resistance R44's is another
The feedback end S1 of one end and the A/D converter controller 110 is electrically connected；The third pole of the switching tube U5 is electrically connected at
Between resistance R48, resistance R49 after the resistance R44 and parallel connection, and it is grounded by resistance R48 and resistance R49；It is described
A/D converter controller 110 is further adapted for detecting the power of PD equipment by the resistance R44, resistance R48 and resistance R49, and
The power received is compared with predetermined power, if the power received is greater than predetermined power, is turned by the modulus
The control terminal K1 control switch pipe Q4 of changer controller 110 is connected, so that switching tube U5 be ended, completes the stopping to PD equipment and supplies
It is electrically operated.
In the present embodiment, the PD detection output module 120 further includes overcurrent protection submodule 124；The overcurrent is protected
Protecting submodule 124 includes adjustment pipe Q6, resistance R42 and current sense resistor；The third pole of the switching tube U5 passes through described
Current sense resistor ground connection；The first pole of the adjustment pipe Q6 and the second pole of switching tube U5 are electrically connected；The adjustment pipe Q6
The second pole pass through the third pole of the resistance R42 and the switching tube U5 and be electrically connected；The third pole of the adjustment pipe Q6 connects
Ground；When switching tube U5 is connected, the first pole of adjustment pipe Q6 be in low level, by the electric current of switching tube U5 by resistance R42 with
Current sense resistor flows into the second pole of adjustment pipe Q6 after being shunted, adjust the voltage of the second pole of pipe Q6 as electric current increases
And increase, when adjusting conducting voltage of the voltage of the second pole of pipe Q6 equal to adjustment pipe Q6, adjustment pipe Q6 is in half and shape is connected
State drags down the third pole tension of switching tube U5, to the electric current of switching tube U5 be reduced, when the electricity of the second pole of adjustment pipe Q6
When pressure is less than the conducting voltage of adjustment pipe Q6, adjustment pipe Q6 cut-off, to play metering function.
Wherein, adjustment pipe Q6 is NPN triode, and the resistance value of resistance R42 is 15K ohm, and limitation electric current is equal to adjustment pipe Q6
Conducting voltage and current sense resistor resistance value.
In the present embodiment, the resistance value of the current sense resistor is 0.75 ohm.Specifically, the current sense resistor
Resistance R48 and the R49 parallel equivalent for being 1.5 ohm by resistance value.
The embodiment of the invention also provides a kind of working method of PSE detection management system, the PSE detection management system
Working method by stopping as PD equipment power supply when detecting the short circuit of PD equipment, offline, overload.When monitoring PD
When equipment short circuit, offline, overload, stops the power supply to PD equipment in time, prevent the generation of high current, avoid damage PSE management
Electronic component, do not influence other channels normal work.
Fig. 3, Fig. 4 and Fig. 5 are please referred to, it is in the present embodiment, described when detecting the short circuit of PD equipment, offline, overload, stop
Method for PD equipment power supply includes: resistance R1, and diode D5 exports 10-12V, 0.1-1mA current detection voltage, mould
The characteristic impedance of number switching controller detection PD equipment；Characteristic impedance is greater than the first preset value and when less than the second preset value,
In the present embodiment, the first preset value is 16K, and the second preset value is 26.9K, indicates that PD equipment is effective, i.e., control switch pipe U5 is
The power supply of PD equipment；The power that the feedback end of A/D converter controller receives is less than 0.25W, and PD equipment off-line, control are opened at this time
Pipe U5 cut-off is closed, is stopped as the power supply of PD equipment；The received power of the feedback end of A/D converter controller is greater than predetermined power, this
When, PD apparatus overload, control switch pipe U5 cut-off stops as the power supply of PD equipment, and A/D converter controller is from detection switch pipe U5
Electric current be the range of maximum current to the control switch pipe U5 processing time ended be 1-4mS.
Specifically, it is described when detecting the short circuit of PD equipment, offline, overload, stop the method powering for the PD equipment also
It include: the maximum current for passing through switching tube U5 by the limitation of current limliting constant-current source, thus the drain voltage of limit switch pipe U5；Modulus
The detection pin of the drain voltage of switching controller detection switch pipe U5 is the IO foot inputted with schmidt trigger, is detected out
Control switching tube U5 cut-off when the drain voltage for closing pipe U5 is high level stops as PD equipment power supply；Analog-to-digital conversion control
Device is from detecting that the range that the drain voltage of switching tube U5 is the processing time that high level ends to control switch pipe U5 is 2-
8uS；When the electric current of A/D converter controller detection switch pipe U5 is maximum current, the feedback of A/D converter controller is terminated at this time
The power of receipts is greater than predetermined power, control switch pipe U5 cut-off；A/D converter controller is from the electric current of detection switch pipe U5 for most
The range of high current to the control switch pipe U5 processing time ended are 1-4mS.To which control is from being shorted to modulus controller U1
Control switch pipe U5 handles the time when ending, and prevents within the processing time, and SOA's switching tube U5 fails, and causes component
Damage.
In the present embodiment, resistance R48, resistance R49, adjust pipe Q6, and resistance R42, switching tube U5 form a current limliting perseverance
Stream source, when high current is by resistance R48, resistance R49 parallel resistance generates voltage, passes to adjustment pipe Q6 by resistance R42, adjusts
The pole C of homogeneous tube Q6 is connect with the G grid (4 foot) of switching tube U5, so that switching tube U5 enters magnification region, continuous current is
800mA (0.6V/0.75R=800mA), if when PD short circuit, the maximum current for flowing through U5 metal-oxide-semiconductor can be limited in 800mA, and
And one is generated close to supply voltage at the pole D of U5 (5678 feet of U5 in Fig. 4).
In the present embodiment, VCC 3.3V, schmidt trigger input IO foot triggering high level be 0.5*3.3V=
1.65V, when voltage is higher than 1.65V on T1 foot, U1 will generate interrupt processing.1.65V voltage derives at the both ends resistance R39
Both end voltage is 1.65V/16.9K*301K=29.39V on to R38, and the end D (5678 foot) voltage of U5 metal-oxide-semiconductor is 29.39V+
1.65V= 31.04V.When setting PSE supply voltage as 48V, featured resistance is (48V-31.04V)/0.8A=21.2R.
It can be seen that: point three kinds of situation discussion
1. impedance is 0R when short circuit, the end D (5678 foot) of U5 MOS is approximately equal to 48V at this time, and R39 both end voltage is higher than 1.65V, U1
Interrupt mechanism interrupt processing, MOS VDS=48V, IDS=0.8A handle time 8uS.The SOA for inquiring selected MOS, meets the requirements.
2. impedance is 20R when short circuit, the end D (5678 foot) voltage of U5 MOS is 32V at this time, and by R39, R38 partial pressure can be obtained
R39 both end voltage is 1.70V, and U1 interrupt mechanism interrupt processing, MOS VDS=32V, IDS=0.8A handle time 8uS.Inquiry choosing
The SOA for determining MOS, meets the requirements.
3. impedance is greater than 20R when short circuit, the end D (5678 foot) voltage of U5 MOS is less than 32V at this time, is divided by R39, R38
It is that may be less than 1.65V that R39 both end voltage, which can be obtained, and U1 not can enter interruption, because the cut-off current of 0.8A is greater than U1's
The maximum power electric current that S1 foot can be set, so, when current limliting is to 0.8A, inherently trigger overload protection mechanism, longest 4mS
It will detect overload, and disconnect PD power supply.MOS VDS < 32V, IDS=0.8A, duration 4mS inquire selected MOS's
SOA is met the requirements.
In conclusion the present invention provides a kind of PSE detection management circuit and its working methods, wherein PSE detection management
Circuit, comprising: A/D converter controller, is analog-to-digital conversion at the PD detection output module being electrically connected with A/D converter controller
First power module of controller power supply and the second power supply module powered for PD equipment；The PD detection output module is suitable for
When detecting PD equipment, the A/D converter controller detects the output module control second power supply module by the PD and is
The PD equipment is powered；First power module and the separation of the power supply of the second power supply module.Turned using modulus
Changer controller does PSE management, at low cost, and configuration is convenient, while motherboard power supply and PD power supply being separated, only with two
Vertical power supply is powered, and reduces interference from each other, meanwhile, when monitoring PD equipment short circuit, in time to PD equipment
Power supply, prevent the generation of high current, avoid damage PSE management electronic component, do not influence other channels normal work.
In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " setting ",
" installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be indirect by intermediary
It is connected, can be the connection inside two elements.For the ordinary skill in the art, on being understood with concrete condition
State the concrete meaning of term in the present invention.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of PSE detection management circuit characterized by comprising
A/D converter controller, is A/D converter controller at the PD detection output module being electrically connected with A/D converter controller
First power module of power supply and the second power supply module powered for PD equipment；
When the PD detection output module is adapted to detect for PD equipment, the A/D converter controller passes through PD detection output
It is that the PD equipment is powered that module, which controls the second power supply module,；
When the PD detection output module is further adapted for detecting PD equipment short circuit, passed through by the A/D converter controller described
It is that the PD equipment is powered that PD, which detects output module and controls the second power supply module stopping,；
First power module and the separation of the power supply of the second power supply module.
2. PSE detection management circuit as described in claim 1, which is characterized in that
The PD detection output module includes PD featured resistance detection sub-module and power supply driven submodule；
The PD featured resistance detection sub-module and the power supply driven submodule are electric with the A/D converter controller respectively
Property connection；
When the PD featured resistance detection sub-module detects PD equipment, the A/D converter controller is detected by the PD
It is that the PD equipment is powered that output module, which controls the second power supply module,.
3. PSE detection management circuit as claimed in claim 2, which is characterized in that
The power supply driven submodule includes switching tube U5 and switching tube Q4；
The first pole of the switching tube U5 and the cathode OUT1- of the second power supply module are electrically connected；
The second pole of the switching tube U5 and the first pole of the switching tube Q4 are electrically connected；
The third pole of the switching tube U5 is grounded；
The first pole of the switching tube Q4 and the anode of the second power supply module are electrically connected；
The second pole of the switching tube Q4 and the control terminal of the A/D converter controller are electrically connected；
The third pole of the switching tube Q4 is grounded；
The A/D converter controller ends suitable for control switch pipe Q4, so that the second pole of switching tube U5 be drawn high, makes to switch
Pipe U5 conducting starts so that the cathode OUT1- of the second power supply module is grounded as PD equipment power supply.
4. PSE detection management circuit as claimed in claim 3, which is characterized in that
The PD detection output module further includes output power feedback submodule；
The output power feedback submodule further includes resistance R44, resistance R48 and resistance R49；
It is grounded after the resistance R48 is in parallel with the resistance R49；
One end of the resistance R44 after resistance R48, the resistance R49 after parallel connection by being grounded；
The other end of the resistance R44 and the feedback end of the A/D converter controller are electrically connected；
The third pole of the switching tube U5 is electrically connected at the resistance R48 after the resistance R44 and parallel connection, between resistance R49,
And it is grounded by resistance R48 and resistance R49；
The A/D converter controller is further adapted for detecting the function of PD equipment by the resistance R44, resistance R48 and resistance R49
Rate, and the power received is compared with predetermined power, if the power received is greater than predetermined power, pass through the mould
The control terminal control switch pipe Q4 conducting of number switching controller is completed the stopping to PD equipment and is supplied so that switching tube U5 be ended
It is electrically operated.
5. PSE detection management circuit as claimed in claim 3, which is characterized in that
The switching tube U5 is N-channel MOS FET pipe.
6. PSE detection management circuit as claimed in claim 5, which is characterized in that
The PD detection output module further includes overcurrent protection submodule；
The overcurrent protection submodule includes adjustment pipe Q6, resistance R42 and current sense resistor；
The third pole of the switching tube U5 is grounded by the current sense resistor；
The first pole of the adjustment pipe Q6 and the second pole of switching tube U5 are electrically connected；
The second pole of the adjustment pipe Q6 is electrically connected by the third pole of the resistance R42 and switching tube U5；
The third pole ground connection of the adjustment pipe Q6；
When switching tube U5 is connected, the first pole of adjustment pipe Q6 be in low level, by the electric current of switching tube U5 by resistance R42 with
Current sense resistor flows into the second pole of adjustment pipe Q6 after being shunted, adjust the voltage of the second pole of pipe Q6 as electric current increases
And increase, when adjusting conducting voltage of the voltage of the second pole of pipe Q6 equal to adjustment pipe Q6, adjustment pipe Q6 is in half and shape is connected
State drags down the third pole tension of switching tube U5, to the electric current of switching tube U5 be reduced, when the electricity of the second pole of adjustment pipe Q6
When pressure is less than the conducting voltage of adjustment pipe Q6, adjustment pipe Q6 cut-off, to play metering function.
7. PSE detection management circuit as claimed in claim 6, which is characterized in that
The resistance value of the current sense resistor is 0.75 ohm.
8. a kind of working method of PSE detection management system, which is characterized in that the working method of the PSE detection management system
By stopping as PD equipment power supply when detecting the short circuit of PD equipment, offline, overload.
9. the working method of PSE detection management system as claimed in claim 8, which is characterized in that described to detect PD equipment
When short circuit, offline, overload, stop include: for the method that the PD equipment is powered
Resistance R1, diode D5 output electric current measure voltage, A/D converter controller detect the characteristic impedance of PD equipment；
Characteristic impedance is greater than the first preset value and when less than the second preset value, indicates that PD equipment is effective, i.e., control switch pipe U5 is
The power supply of PD equipment；
The power that the feedback end of A/D converter controller receives is less than 0.25W, at this time PD equipment off-line, and control switch pipe U5 is cut
Only, stop as the power supply of PD equipment；
The received power of the feedback end of A/D converter controller is greater than predetermined power, at this point, PD apparatus overload, control switch pipe U5
Cut-off stops as the power supply of PD equipment, A/D converter controller from the electric current of detection switch pipe U5 be maximum current to control switch
The range of the processing time of pipe U5 cut-off is 1-4mS.
10. the working method of PSE detection management system as claimed in claim 9, which is characterized in that described to detect PD equipment
When short circuit, offline, overload, the method that stops powering for the PD equipment further include:
The maximum current for passing through switching tube U5 by the limitation of current limliting constant-current source, thus the drain voltage of limit switch pipe U5；
The detection pin of the drain voltage of A/D converter controller detection switch pipe U5 is the IO foot inputted with schmidt trigger,
Control switching tube U5 cut-off when the drain voltage for detecting switching tube U5 is high level stops as PD equipment power supply；
A/D converter controller is from detecting that the drain voltage of switching tube U5 is the processing that ends to control switch pipe U5 of high level
The range of time is 2-8uS.
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| CN201910018935.5A CN109613450A (en) | 2019-01-09 | 2019-01-09 | PSE detection management circuit and its working method |
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Application publication date: 20190412 |