CN108574259A - A kind of protective device of direct current supply, system and control method - Google Patents
A kind of protective device of direct current supply, system and control method Download PDFInfo
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- CN108574259A CN108574259A CN201810652097.2A CN201810652097A CN108574259A CN 108574259 A CN108574259 A CN 108574259A CN 201810652097 A CN201810652097 A CN 201810652097A CN 108574259 A CN108574259 A CN 108574259A
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- 230000001681 protective effect Effects 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims description 22
- 230000002159 abnormal effect Effects 0.000 claims description 10
- 230000003111 delayed effect Effects 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 9
- 230000002441 reversible effect Effects 0.000 claims description 3
- 230000007257 malfunction Effects 0.000 abstract description 3
- 230000001012 protector Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 17
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- 238000005516 engineering process Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
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- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
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- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
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- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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Classifications
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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
- H02H3/006—Calibration or setting of parameters
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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
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
-
- 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
- H02H3/087—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 for dc applications
-
- 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
- H02H3/10—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 additionally responsive to some other abnormal electrical conditions
-
- 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
- H02H3/20—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 voltage
- H02H3/202—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 voltage for dc systems
-
- 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
- H02H3/24—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 undervoltage or no-voltage
- H02H3/243—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 undervoltage or no-voltage for DC systems
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Abstract
The present invention relates to direct current supply fields, and in particular to a kind of protective device of direct current supply.The protective device includes main control unit, switch unit and current detecting unit, and the main control unit is connect with switch unit and current detecting unit respectively, and the switch unit is also connect with positive pole busbar and positive pole branch line respectively；The switch unit carries out access, opening operation according to the control of main control unit to positive pole busbar and positive pole branch line, the current detecting unit obtains the current information by switch unit, and sends current anomaly signal to main control unit in current information exception.The present invention goes back body and is related to a kind of the protection system and control method of direct current supply.The present invention can accurately set overcurrent, overvoltage, under-voltage value by one kind, be provided simultaneously with overcurrent, overvoltage, under-voltage, overheat protector and monitoring bussed supply state, monitor load condition, show the intelligent restoration protection circuit of malfunction.
Description
Technical field
The present invention relates to direct current supply fields, and in particular to a kind of protective device of direct current supply, system and control method.
Background technology
For POE using concentration direct current supply mode, topological structure is as shown in Figure 1 at present.All branch terminal equipment 120 are powered
Electricity directly all is taken from the busbar that the same power inverter 110 exports, to prevent a certain branch from short circuit or over current fault occur,
To influence busbar voltage, and then the normal work for the terminal device 120 that other are connected to busbar is influenced, generally at each
Lu Douhui one self-recovery fuse 130 of series connection.
Wherein, wherein POE (Power Over Ethernet) refers to connecting up foundation frame in existing Ethernet Cat.5
In the case that structure does not make any changes, for some IP-based terminal (such as IP telephone machine, wireless local network connecting point AP, nets
Network video camera etc.) transmission data signal while, moreover it is possible to the technology of direct current supply is provided for such equipment.
130 operation principle of self-recovery fuse is to flow through self-recovery fuse 130 when short circuit or overload occur for circuit
The heat that high current generates forms it into high-impedance state, and operating current reduces, to which circuit is limited and be protected.When event
After barrier excludes, self-recovery fuse 130 reverts to low resistive state, to complete the protection to circuit.
After its principle can be seen that overcurrent first, high temperature is then generated, then forms high resistant, just realizes protection.Cause
This, occurs overcurrent, is that cannot generate protection immediately, it is necessary to etc. after temperature rises, can just protect.In practical applications, often
One branch breaks down, and due to protecting not in time, power inverter 110 can be caused to restart, influence all be connected on busbar
Branch terminal equipment 120 work normally.
In order to reduce influence of the fault branch to the other-end equipment 120 connected on busbar, industry proposes collection
Chinese style direct current grouping power supply topological structure, as shown in Figure 2.In this way, a branch goes wrong, can only influence with other branch organized
Road, the branch without influencing other groups, substantially reduces impacted number of branches.
But take this topological structure that each group can be caused must all to increase a power inverter 110, not only cost, body
Product all greatly increases, and can not tackle the problem at its root, still have branch to be affected.
So this structure is uneconomical, not environmentally, but again must not and for it.
Invention content
The technical problem to be solved in the present invention is, for the drawbacks described above of the prior art, provides a kind of direct current supply
Protective device, system and control method, solve the problems, such as existing topological structure it is uneconomical, not environmentally, control effect it is undesirable.
The technical solution adopted by the present invention to solve the technical problems is：A kind of protective device of direct current supply, institute are provided
It includes main control unit, switch unit and current detecting unit to state protective device, the main control unit respectively with switch unit and electricity
Detection unit connection is flowed, the switch unit is also connect with positive pole busbar and positive pole branch line respectively；Wherein, described to open
It closes unit and access, opening operation, the electricity is carried out to positive pole busbar and positive pole branch line according to the control of main control unit
It flows detection unit and obtains the current information for passing through switch unit, and sending current anomaly signal in current information exception to master
Unit is controlled, the main control unit turns off operation according to current anomaly Signal-controlled switch unit.
Wherein, preferred version is：The switch unit includes the first power switch tube, the leakage of first power switch tube
Pole is connect with positive pole busbar, and source electrode is connect with positive pole branch line, and grid is connect with main control unit, and according to master control
The driving of unit, access or the disconnection of control drain electrode and source electrode.
Wherein, preferred version is：The current detecting unit is put including the second power switch tube, first resistor and the first OP
Big device, the drain electrode of second power switch tube access the drain electrode of the first power switch tube, source electrode after connecting with first resistor
It is connect with the source electrode of the first power switch tube, grid is connect with main control unit, the normal phase input end of the first OP amplifiers
It is connect respectively with the both ends of first resistor with reverse input end, output end is connect with main control unit, the first OP amplifiers
Reference edge connect with positive pole busbar by second resistance.
Wherein, preferred version is：The size of second power switch tube is less than the size of the first power switch tube.
Wherein, preferred version is：The protective device further includes the grid being arranged in main control unit and the first power switch tube
Drive module between pole, the drive module drive the access of the first power switch tube according to the control of main control unit or break
It opens.
Wherein, preferred version is：The protective device further includes the charge pump being connect with drive module, and the charge pump is also
It is connect with positive pole busbar, and the voltage value of positive pole busbar is improved to the voltage for the first power switch tube access
It is worth, and is provided to the grid of the first power switch tube by drive module.
Wherein, preferred version is：The protective device further includes voltage detection unit, the signal of the voltage detection unit
Output end is connect with main control unit, and voltage input end is incorporated to positive pole busbar by a resistance respectively and power cathode is female
Line, and the supply voltage between positive pole busbar and power cathode busbar is obtained, and send voltage in supply voltage exception
Abnormal signal to main control unit, the main control unit turns off operation according to electric voltage exception Signal-controlled switch unit.
Wherein, preferred version is：The voltage detection unit further includes first comparator and the second comparator, and described first
The positive input of the inverting input of comparator and the second comparator is connect with voltage input end, the first comparator
Positive input accesses the first reference voltage, and the inverting input of second comparator accesses the second reference voltage, and described the
The output end of the output end of one comparator and the second comparator is connect with signal output end；Wherein, the electricity of the first reference voltage
Pressure value is more than the voltage value of the second reference voltage.
Wherein, preferred version is：The protective device further includes the temperature detecting unit of monitoring switch cell temperature, described
Temperature detecting unit is connect with main control unit, and sends temperature anomaly signal to main control unit, the master control in temperature anomaly
Unit controls switch unit according to abnormal signal and turns off operation.
Wherein, preferred version is：The protective device further includes the display driver element being connect with main control unit, described aobvious
Show that driving unit includes the first output control terminal and the second output control terminal for driving the work of external LED lamp, the display driving
Unit drives the work of external LED lamp according to the control of main control unit by the first output control terminal and the second output control terminal.
Wherein, preferred version is：The protective device is encapsulated in a chip, and the chip includes at least the ports OD, OS
Port, the ports iset and the ports gnd, the switch unit are connect with the ports OD and the ports OS respectively, the current detecting unit
It is connect respectively with the ports OD, the ports OS and the ports iset, the chip is connect by the ports OD with positive pole busbar, is passed through
The ports OS are connect with positive pole branch line, are connect with a resistance by the ports iset and are entered back into positive pole busbar, the ends gnd
Mouth ground connection.
The technical solution adopted by the present invention to solve the technical problems is：A kind of protection system of direct current supply is provided, it is defeated
Enter power supply electric energy is transmitted in corresponding terminal device by positive pole busbar and power cathode busbar, the protection system
Including multiple protective devices for controlling the break-make of positive pole busbar.
The technical solution adopted by the present invention to solve the technical problems is：A kind of control method, the control method are provided
It applies in the protective device, the step of control method includes：According to fault-signal or abnormal signal control switch
Unit turns off operation；After each opening operation, delay preset time control switch unit carries out closed circuit operation；According to difference
Restart number setting different delayed time preset time.
The beneficial effects of the present invention are compared with prior art, the present invention can accurately set overcurrent, mistake by one kind
Pressure, under-voltage value are provided simultaneously with overcurrent, overvoltage, under-voltage, overheat protector and monitoring bussed supply state, monitor load condition, display
The intelligent restoration of malfunction protects circuit；Further, also have it is at low cost, stability is strong, to other branches affects
It is low, the advantages such as small.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing：
Fig. 1 is the structural schematic diagram of existing DC power-supply system；
Fig. 2 is the structural schematic diagram of existing local DC power-supply system；
Fig. 3 is the structural schematic diagram of protective device of the present invention；
Fig. 4 is the structural schematic diagram of the DC power-supply system the present invention is based on protective device；
Fig. 5 is the structural schematic diagram of switch unit of the present invention；
Fig. 6 is the structural schematic diagram of current detecting unit embodiment one of the present invention；
Fig. 7 is the structural schematic diagram of current detecting unit embodiment two of the present invention；
Fig. 8 is the structural schematic diagram of drive module of the present invention；
Fig. 9 is the structural schematic diagram of charge pump and drive module of the present invention；
Figure 10 is the structural schematic diagram of protective devices of the Ben Mingfa based on voltage detection unit；
Figure 11 is the structural schematic diagram of voltage detection unit of the present invention；
Figure 12 is the structural schematic diagram of temperature detecting unit of the present invention；
Figure 13 is the structural schematic diagram of display driver element of the present invention；
Figure 14 is the structural schematic diagram that protective device of the present invention constitutes chip embodiment one；
Figure 15 is the structural schematic diagram that protective device of the present invention constitutes chip embodiment two；
Figure 16 is the flow diagram of the control method of protective device of the present invention；
Figure 17 is the schematic diagram of related method thereof of the present invention.
Specific implementation mode
In conjunction with attached drawing, elaborate to presently preferred embodiments of the present invention.
As shown in Figure 3 and Figure 4, the present invention provides a kind of preferred embodiment of the protective device of direct current supply.
A kind of protective device 230 of direct current supply, the protective device 230 include main control unit 231, switch unit 232
With current detecting unit 233, the main control unit 231 is connect with switch unit 232 and current detecting unit 233 respectively, described
Switch unit 232 is also connect with positive pole busbar 241 and positive pole branch line 251 respectively；Wherein, the switch unit 232
Access, opening operation are carried out to positive pole busbar 241 and positive pole branch line 251 according to the control of main control unit 231, it is described
Current detecting unit 233 obtains the current information by switch unit 232, and is sending current anomaly in current information exception
Signal to main control unit 231, the main control unit 231 turns off operation according to current anomaly Signal-controlled switch unit 232.
Specifically, current detecting unit 233 obtains the current information by switch unit 232, that is, passes through protective device 230
And terminal device 220 is flowed into as the current information of its power supply, current information includes the current value of electric current, when current value is excessive, i.e.,
Overcurrent, main control unit 231 turn off operation according to current anomaly Signal-controlled switch unit 232.For example, when current value is excessive
When, the current processing overcurrent by protective device 230, current detecting unit 233 is sent in over-current signal to main control unit 231,
Main control unit 231 controls switch unit 232 according to over-current signal and turns off operation, positive electrode bus of cutting off the power 241 and power supply
The connection of positive branch line 251, that is, the supply line of positive electrode bus of cutting off the power 241 and terminal device 220.
And the present invention also provides a kind of protection systems of direct current supply, and with reference to figure 4, input power by power supply just
Electric energy is transmitted in corresponding terminal device 220 by pole busbar 241 and power cathode busbar 242, and the protection system includes more
A protective device 230 for controlling the break-make of positive pole busbar 241.Wherein, DC power-supply system includes power input,
And connect with positive pole busbar 241 and power cathode busbar 242 by power inverter 210, and the source positive electrode bus 241 that is powered
It powers for terminal device 220 with power cathode busbar 242, the positive pole branch line 251 and power cathode of each terminal device 220
Branch line 252 is connected with corresponding positive pole busbar 241 and power cathode busbar 242 respectively, while in positive pole busbar 241
Protective device 230, the break-make for controlling positive pole busbar 241, i.e. control terminal are set between positive pole branch line 251
The break-make of equipment 220.
This way it is not necessary to increase power inverter 210, a power inverter 210 and corresponding protective device are only needed
230, cost is substantially reduced, meanwhile, also reduce the volume of entire DC power-supply system.
As shown in figure 5, the present invention provides a kind of preferred embodiment of switch unit.
The switch unit 232 includes the first power switch tube K1, the drain electrode of the first power switch tube K1 and power supply
Positive electrode bus 241 connects, and source electrode is connect with positive pole branch line 251, and grid is connect with main control unit 231, and according to master
Control the driving of unit 231, access or the disconnection of control drain electrode and source electrode.
Preferably, the first power switch tube K1 types use NMOS, play access and deenergization positive electrode bus 241 and electricity
The effect of source anode branch line 251；And chip area can effectively be reduced using NMOS tube type, reduce cost.Wherein, NMOS
It is electronics that device, which participates in conductive carrier, and it is hole that PMOS device, which participates in conductive carrier, since the mobility of electronics is
3-5 times of hole, therefore same current driving ability is reached, the area of PMOS device is just far longer than the face of NMOS device
Product, cost just follow rising.
Certainly, if not minding cost, the driving metal-oxide-semiconductor using PMOS device as the first power switch tube K1, and can
Capable, also belong to the protection domain of the application.
As shown in Figure 6 and Figure 7, the present invention provides a kind of preferred embodiment of current detecting unit.
The current detecting unit 233 includes the second power switch tube K2, first resistor R1 and the first OP amplifier OP1,
The drain electrode of the second power switch tube K2 accesses the drain electrode of the first power switch tube K1, source electrode after connecting with first resistor R1
It is connect with the source electrode of the first power switch tube K1, grid is connect with main control unit 231, and the first OP amplifiers OP1 is just
Phase input terminal and reverse input end are connect with the both ends of first resistor R1 respectively, and output end is connect with main control unit 231, described
The reference edge of first OP amplifiers OP1 is connect by second resistance R2 with positive pole busbar 241, and benchmark is obtained by reference edge
Parameter.Also, overcurrent numerical value is adjusted by the bias voltage that reference edge inputs, meets the needs of distinct device.
Preferably, the second power switch tube K2 types use the NMOS of sense FET, (are used using sense FET technologies
Field-effect transistor detects), the electric current flowed through is N/mono- of the first power switch tube K1, and the value of N is the first power switch
The size ratio of pipe K1 and the second power switch tube K2, the i.e. size of the second power switch tube K2 are less than the first power switch tube K1's
Size, so the electric current for flowing through the second power switch tube K2 is just very small, the power consumption penalty of generation is also smaller.
Specifically, by monitoring the electric current of first resistor R1, the prison to the electric current by the second power switch tube K2 is realized
Control, OP1 can precisely obtain the current value of first resistor R1, and judge the second power switch tube of pipe K2 whether overcurrent, if overcurrent from
Output end generates over-current signal to main control unit 231.And the adjusting by second resistance R2, overcurrent protection value is set, according to
The connection of different branch terminal device 220 can flexibly set overcurrent protection value.
And with reference to figure 7, the electric current on the second power switch tube K2 is monitored by the 2nd OP amplifiers OP2, judges that terminal is set
Standby 220 working condition, and will determine that result is sent to main control unit 231, if being powered, power on signal is sent to main control unit
231, if no power, do not send a signal to main control unit 231, main control unit 231 is according to the power on signal of transmission or cannot send
Power on signal identify the second power switch tube K2 whether access, to identification the first power switch tube K1 whether access, to sentence
The working condition of disconnected terminal device 220, i.e. access or open circuit.
As shown in Figure 8 and Figure 9, the present invention provides a kind of preferred embodiment of drive module.
The protective device 230 further includes being arranged between main control unit 231 and the grid of the first power switch tube K1
Drive module 234, the drive module 234 according to main control unit 231 control driving the first power switch tube K1 access or
It disconnects.
And drive module 234 is also connect with the grid of the second power switch tube K2, and according to the control of main control unit 231
The access of the second power switch tube K2 of system driving or disconnection；Control can drive simultaneously, can also respectively drive.
Further, the protective device 230 further includes the charge pump 235 being connect with drive module 234, the charge pump
235 also connect with positive pole busbar 241, and the voltage value of positive pole busbar 241 is improved to for the first power switch
The voltage value of pipe K1 accesses, and it is provided to by drive module 234 grid of first power switch tube K1, alternatively, the charge
Pump 235 improves the voltage value of positive pole busbar 241 to the voltage value for the second power switch tube K2 accesses, and passes through drive
Dynamic model block 234 is provided to the grid of the second power switch tube K2.
Wherein, charge pump 235 using 235 technology of charge pump by from positive pole busbar 241 tap into come voltage (VOD) carry
Height is at least in the threshold voltage V of the first power switch tube K1 and the second power switch tube K2thn+VODMore than, it is up to 5V+
VOD；The voltage of promotion is mainly used for drive module 234, to drive the first power switch tube K1 and the second power switch tube
K2。
As shown in Figure 10 and Figure 11, the present invention provides a kind of preferred embodiment of voltage detection unit.
The protective device 230 further includes voltage detection unit 236, the signal output end of the voltage detection unit 236
It is connect with main control unit 231, voltage input end is incorporated to positive pole busbar 241 and power supply by a resistance (R3 and R4) respectively
Negative electrode bus 242, and the supply voltage between positive pole busbar 241 and power cathode busbar 242 is obtained, and in supply voltage
Electric voltage exception signal is sent when abnormal to main control unit 231, the main control unit 231 is according to electric voltage exception Signal-controlled switch list
Member 232 turns off operation.
Specifically, and with reference to figure 11, the voltage detection unit 236 further includes first comparator COM1 and the second comparator
The positive input of COM2, the inverting input of the first comparator COM1 and the second comparator COM2 are and voltage input end
The positive input of connection, the first comparator COM1 accesses the first reference voltage 2362, the second comparator COM2's
Inverting input the second reference voltage 2361 of access, the output end of the first comparator COM1 and the second comparator COM2's is defeated
Outlet is connect with signal output end；Wherein, the voltage value of the first reference voltage 2362 is more than the electricity of the second reference voltage 2361
Pressure value.
When the voltage value of voltage input end is less than the second reference voltage 2361, i.e. positive pole busbar 241 and power cathode
Busbar 242 is in under-voltage condition, only first comparator COM1 output signals, and main control unit 231 is to only obtaining first comparator
The signal of COM1 outputs thinks that positive pole busbar 241 and power cathode busbar 242 are in under-voltage condition；When voltage input end
Voltage value be more than the first reference voltage 2362 and, i.e., positive pole busbar 241 and power cathode busbar 242 are in overvoltage condition,
Only the second comparator COM2 output signals, main control unit 231 think electricity to the signal that the second comparator COM2 is exported is obtained
Source positive electrode bus 241 and power cathode busbar 242 are in overvoltage condition.
Further, 3rd resistor, voltage input end and power supply are set between voltage input end and positive pole busbar 241
4th resistance is set between negative electrode bus 242, by adjusting the resistance value of 3rd resistor and the 4th resistance, controls voltage input end
Voltage value.
As shown in figure 12, the present invention provides a kind of preferred embodiment of temperature detecting unit.
The protective device 230 further includes the temperature detecting unit 237 of 232 temperature of monitoring switch unit, the temperature inspection
It surveys unit 237 to connect with main control unit 231, and temperature anomaly signal is sent to main control unit 231, the master in temperature anomaly
Control unit 231 controls switch unit 232 according to abnormal signal and turns off operation.
Specifically, temperature detecting unit 237 is preferably temperature sensor, and proximity switches unit 232 is arranged, and obtains patch
Nearly switch unit 232 is arranged, the temperature conditions of pilot switch unit 232, and in 232 temperature anomaly of switch unit, such as temperature
It is excessively high, temperature anomaly signal is sent to main control unit 231.
Preferably, temperature detecting unit 237 also has the function of band temperature hysteresis, can be realized by hysteresis circuitry.
As shown in figure 13, the present invention provides a kind of preferred embodiment of display driver element.
The protective device 230 further includes the display driver element 238 being connect with main control unit 231, the display driving
Unit 238 includes the first output control terminal and the second output control terminal of driving external LED lamp work, the display driver element
238 drive external LED lamp (LED1 according to the control of main control unit 231 by the first output control terminal and the second output control terminal
And LED2) work.
Preferably, external LED lamp includes red light and green light, and only green LED lamp is bright：It is normal to identify bussed supply, and is
Unloaded or underloading；Only red LED lamp is always on：It identifies bussed supply exception or temperature is excessively high；Only red LED lamp flicker is bright：
It identifies branch and short circuit or excess flow fault condition occurs；Red and green LED is all bright, in orange：It is normal to identify bussed supply, and is
There are load or heavy condition.
As shown in Figure 14 and Figure 15, the present invention provides a kind of preferred embodiment of protective device encapsulation.
In the present embodiment, and with reference to figure 14, the protective device 230 is encapsulated in a chip, and the chip at least wraps
The ports OD, the ports OS, the ports iset and the ports gnd are included, the switch unit 232 is connect with the ports OD and the ports OS respectively, institute
Current detecting unit 233 is stated to connect with the ports OD, the ports OS and the ports iset respectively, the chip by the ports OD and power supply just
Pole busbar 241 connects, and is connect with positive pole branch line 251 by the ports OS, is connected by the ports iset and second resistance R2
It connects and enters back into positive pole busbar 241, the ports gnd ground connection.
Further, chip and external circuit structure are constituted into a circuit main board or circuit module.Overall volume is very small,
The far smaller than volume of self-recovery fuse, therefore the protection module constituted using said chip, can optimize centralized direct current
The structure of power supply system reduces volume, while keeping system more safe and reliable, economical, environmentally friendly.
In the present embodiment, and with reference to figure 15, on the basis of above-mentioned Figure 14 embodiments, the chip further includes the ends uvp
Mouth, the ports BV, the ports DG and the ports DR, the voltage input end of the voltage detection unit 236 are connect with the ports uvp, described aobvious
Show that the first output control terminal of driving unit 238 is connect with the ports DG, the second output control terminal is connect with the ports DR, the electricity
Lotus pump 235 is connect with the ports BV, and further, the ports BV are opened by a capacitance and power cathode busbar 242 for internal power
It closes and driving voltage is provided.
In the present embodiment, chip is preferably ZS3012 modules.
In the present invention, a kind of preferred embodiment of protective device 230 is also provided.
The protective device 230 further includes adjuster and clock module, and the adjuster accesses positive pole busbar 241
Electric energy, and generate different, stable, accurate bias currents and voltage and used for other modules, such as main control unit 231, charge pump
235, clock module, current detecting unit 233, voltage detection unit 236, display driver element 238 and temperature detecting unit
237。
Meanwhile clock module generates clock signal, and charge pump 235 and the use of main control unit 231 are provided.
As shown in Figure 16 and Figure 17, the present invention provides a kind of preferred embodiment of control method.
The step of a kind of control method, the control method are applied in the protective device 230, the control method
Including：
Step S11, operation is turned off according to fault-signal or abnormal signal control switch unit 232；
Step S12, after each opening operation, delay preset time control switch unit 232 carries out closed circuit operation；
Step S13, according to the different preset times restarted number and different delayed time is arranged.
Specifically refer to Figure 17, line segment includes multiple periods (such as T1, T2 ..., T8), restart delay time T1, T2,
The numerical values recited of T3, T4 successively increase, and finally fix in T4.It can also can to T5, T6, T7, T8 ... by delay time.It adopts
It is to prevent malfunction long-term existence to take the incremental purpose that is delayed, and system is frequently restarted and overcurrent protection, causes larger
Power consumption.For example, the reboot time interval 1.28s of the 1st main control unit 231；Between the reboot time of 2nd, 3 main control unit 231
It is divided into 10.24s；It is divided into 81.92s between the reboot time of 4th, 5,6,7 main control unit 231；Main control unit 231 after 8th time
Reboot time interval be set to 327.68s, no longer change.
Preferably, above-mentioned fault-signal or abnormal signal can be over-current signal.
A kind of control flow further, is being provided：
1, start and initialize protective device 230, preferably be off the first power switch tube K1 and LED light；
2, the supply voltage of detection positive pole busbar 241 and power cathode busbar 242；
If 3, when supply voltage exception, red light is always on and is back to step 2；If supply voltage is normal, start charge
Pump 235；Further, whether the supply voltage of detection charge pump 235 is normal, enters step 4 if normal, no person constantly examines again
Whether the supply voltage for surveying charge pump 235 is normal；
4, it opens the first power switch tube K1 and green light is made to be always on；
5, three kinds of detection operations are carried out at the same time, voltage (step 6-8), the prison of monitoring positive pole busbar 241 are respectively included
It surveys the conducting electric current (step 12-11) of the first power switch tube K1, monitor the working condition (step 9-11) of terminal device 220；
6, into the voltage operating process of monitoring positive pole busbar 241, whether the voltage of detection positive pole busbar 241
Normally, 7 are entered step if normal, if abnormal enter step 8；
7, it realizes and opens the first power switch tube K1, green light is always on closes with red light, and resumes step 6；
8, it realizes and closes the first power switch tube K1, green light is closed and red light is always on, and resumes step 6；
9, into the working condition operating process of monitoring terminal device 220, access terminal equipment 220 is detected whether, if connecing
Enter and enter step 10, instead then enters step 11；
10, red light, and resumes step 9 are closed；
11, red light is always on, and resumes step 9；
12, the first power switch tube K1 conducting electric currents are detected；If overcurrent enters step 13；
13, the first power switch tube K1, stroboscopic red light and closing green light, and the T1 that is delayed are closed, the first power switch is restarted
Pipe K1；
14, the first power switch tube K1 conducting electric currents are detected again；If overcurrent enters step 14；It enters step if normal
12；
15, the first power switch tube K1, stroboscopic red light and closing green light, and the T2 that is delayed are closed, the first power switch is restarted
Pipe K1；
16, the first power switch tube K1 conducting electric currents are detected again；If overcurrent enters step 17；Close red light simultaneously if normal
12 are entered step after being always on green light；
17, the first power switch tube K1, stroboscopic red light and closing green light, and the T3 that is delayed are closed, the first power switch is restarted
Pipe K1；
18, the first power switch tube K1 conducting electric currents are detected again；If overcurrent enters step 19；Close red light simultaneously if normal
12 are entered step after being always on green light；
19, the first power switch tube K1, stroboscopic red light and closing green light, and the T4 that is delayed are closed, the first power switch is restarted
Pipe K1；
20, the first power switch tube K1 conducting electric currents are detected again；If overcurrent enters step 19；Close red light simultaneously if normal
12 are entered step after being always on green light.
Wherein, above-mentioned flow times of periods such as T4 and subsequent delay time T5, T6 that are delayed at the 4th time are identical, because
This is delayed at the 4th time after detection, constantly repeats step 19 and step 20；If differing, then subsequent period of time is further carried out
Delay, it is known that the last one identical with subsequent period of time period occurs.
As described above, only preferred embodiment is not intended to limit the scope of the present invention, Fan Yibenfa
Equivalent change or modification made by bright claim is all that the present invention is covered.
Claims (13)
1. a kind of protective device of direct current supply, it is characterised in that：The protective device includes main control unit, switch unit and electricity
Flow detection unit, the main control unit connect with switch unit and current detecting unit respectively, the switch unit also respectively with
Positive pole busbar is connected with positive pole branch line；Wherein, the switch unit according to the control of main control unit to positive pole
Busbar and positive pole branch line carry out access, opening operation, and the current detecting unit is obtained to be believed by the electric current of switch unit
Breath, and current anomaly signal is sent to main control unit in current information exception, the main control unit is according to current anomaly signal
Control switch unit turns off operation.
2. protective device according to claim 1, it is characterised in that：The switch unit includes the first power switch tube,
The drain electrode of first power switch tube is connect with positive pole busbar, and source electrode is connect with positive pole branch line, grid with
Main control unit connects, and according to the driving of main control unit, access or the disconnection of control drain electrode and source electrode.
3. protective device according to claim 2, it is characterised in that：The current detecting unit includes the second power switch
Pipe, first resistor and the first OP amplifiers, the drain electrode of second power switch tube access the first work(after connecting with first resistor
The drain electrode of rate switching tube, source electrode are connect with the source electrode of the first power switch tube, and grid is connect with main control unit, and described first
The normal phase input end and reverse input end of OP amplifiers are connect with the both ends of first resistor respectively, and output end connects with main control unit
It connects, the reference edge of the first OP amplifiers is connect by second resistance with positive pole busbar.
4. protective device according to claim 3, it is characterised in that：The size of second power switch tube is less than first
The size of power switch tube.
5. protective device according to claim 2, it is characterised in that：The protective device further includes being arranged in main control unit
Drive module between the grid of the first power switch tube, the drive module drive the first work(according to the control of main control unit
The access of rate switching tube or disconnection.
6. protective device according to claim 5, it is characterised in that：The protective device further includes being connect with drive module
Charge pump, the charge pump is also connect with positive pole busbar, and the voltage value of positive pole busbar is improved to for
The voltage value of one power switch tube access, and it is provided to by drive module the grid of the first power switch tube.
7. protective device according to claim 1, it is characterised in that：The protective device further includes voltage detection unit,
The signal output end of the voltage detection unit is connect with main control unit, and voltage input end is incorporated to power supply by a resistance respectively
Positive electrode bus and power cathode busbar, and the supply voltage between positive pole busbar and power cathode busbar is obtained, and supplying
Electric voltage exception signal is sent when piezoelectric voltage exception to main control unit, the main control unit is according to electric voltage exception Signal-controlled switch list
Member turns off operation.
8. protective device according to claim 7, it is characterised in that：The voltage detection unit further includes first comparator
With the second comparator, the positive input of the inverting input of the first comparator and the second comparator is and voltage input end
The positive input of connection, the first comparator accesses the first reference voltage, the anti-phase input termination of second comparator
Enter the second reference voltage, the output end of the output end of the first comparator and the second comparator is connect with signal output end；
Wherein, the voltage value of the first reference voltage is more than the voltage value of the second reference voltage.
9. protective device according to claim 1, it is characterised in that：The protective device further includes monitoring switch unit temperature
The temperature detecting unit of degree, the temperature detecting unit are connect with main control unit, and temperature anomaly letter is sent in temperature anomaly
Number to main control unit, the main control unit controls switch unit according to abnormal signal and turns off operation.
10. protective device according to claim 1, it is characterised in that：The protective device further includes connecting with main control unit
The display driver element connect, the display driver element include driving the first output control terminal and second of external LED lamp work
Output control terminal, the display driver element are controlled according to the control of main control unit by the first output control terminal and the second output
End driving external LED lamp work.
11. protective device according to any one of claims 1 to 10, it is characterised in that：The protective device is encapsulated in a core
In piece, the chip include at least the ports OD, the ports OS, the ports iset and the ports gnd, the switch unit respectively with the ports OD
It is connected with the ports OS, the current detecting unit is connect with the ports OD, the ports OS and the ports iset respectively, and the chip passes through OD
Port is connect with positive pole busbar, is connect with positive pole branch line by the ports OS, is passed through the ports iset and a resistance
Connection enters back into positive pole busbar, the ports gnd ground connection.
12. a kind of protection system of direct current supply, it is characterised in that：Input power is female by positive pole busbar and power cathode
Electric energy is transmitted in corresponding terminal device by line, and the protection system includes multiple break-makes for controlling positive pole busbar
And the protective device as described in claim 1-11 is any.
13. a kind of control method, it is characterised in that：The control method is applied in the guarantor as described in claim 1 to 11 is any
In protection unit, the step of control method, includes：
Operation is turned off according to fault-signal or abnormal signal control switch unit；
After each opening operation, delay preset time control switch unit carries out closed circuit operation；
According to the different preset times restarted number and different delayed time is arranged.
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| CN201810652097.2A CN108574259A (en) | 2018-06-22 | 2018-06-22 | A kind of protective device of direct current supply, system and control method |
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|---|---|---|---|
| CN201810652097.2A CN108574259A (en) | 2018-06-22 | 2018-06-22 | A kind of protective device of direct current supply, system and control method |
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| CN108574259A true CN108574259A (en) | 2018-09-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110061476A (en) * | 2019-05-20 | 2019-07-26 | 江苏凯创电子科技有限公司 | Power supply device with overcurrent protection |
| CN110445089A (en) * | 2019-09-02 | 2019-11-12 | 深圳市强军科技有限公司 | Protect circuit and protective device |
| CN110554233A (en) * | 2019-10-12 | 2019-12-10 | 深圳市欧瑞博科技有限公司 | fault current detection device and method applied to intelligent switch |
| CN110676816A (en) * | 2019-09-16 | 2020-01-10 | 无锡江南计算技术研究所 | Low-voltage high-current multiphase parallel DC/DC power supply protection circuit |
| CN111834991A (en) * | 2020-06-04 | 2020-10-27 | 广州京善电子有限公司 | Direct current power distribution system with fault isolation function and intelligent controller |
| CN111913124A (en) * | 2020-07-27 | 2020-11-10 | 苏州浪潮智能科技有限公司 | Circuit for displaying power failure of main board |
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| CN110061476A (en) * | 2019-05-20 | 2019-07-26 | 江苏凯创电子科技有限公司 | Power supply device with overcurrent protection |
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| CN110676816A (en) * | 2019-09-16 | 2020-01-10 | 无锡江南计算技术研究所 | Low-voltage high-current multiphase parallel DC/DC power supply protection circuit |
| CN110554233A (en) * | 2019-10-12 | 2019-12-10 | 深圳市欧瑞博科技有限公司 | fault current detection device and method applied to intelligent switch |
| CN111834991A (en) * | 2020-06-04 | 2020-10-27 | 广州京善电子有限公司 | Direct current power distribution system with fault isolation function and intelligent controller |
| CN111834991B (en) * | 2020-06-04 | 2022-03-29 | 广州京善电子有限公司 | Direct current power distribution system with fault isolation function and intelligent controller |
| CN111913124A (en) * | 2020-07-27 | 2020-11-10 | 苏州浪潮智能科技有限公司 | Circuit for displaying power failure of main board |
| CN111913124B (en) * | 2020-07-27 | 2022-06-10 | 苏州浪潮智能科技有限公司 | Circuit for displaying power failure of main board |
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