CN208299427U - Overvoltage crowbar and over-pressure safety device - Google Patents
Overvoltage crowbar and over-pressure safety device Download PDFInfo
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- CN208299427U CN208299427U CN201820920851.1U CN201820920851U CN208299427U CN 208299427 U CN208299427 U CN 208299427U CN 201820920851 U CN201820920851 U CN 201820920851U CN 208299427 U CN208299427 U CN 208299427U
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Abstract
The utility model discloses a kind of overvoltage crowbar and over-pressure safety device, wherein, the power input of rectification circuit is connect with ac power input end, the anode of the output end of rectification circuit, the first end of bus capacitor is connect with the anode of the input terminal of electrical equipment with the first sampling end of busbar voltage sample circuit, the cathode of the output end of rectification circuit and the power input of soft starting circuit connect, the power output end of soft starting circuit, the second end of bus capacitor and the second sampling end of busbar voltage sample circuit are interconnected with the cathode of the input terminal of electrical equipment, the signal output end of busbar voltage sample circuit and the signal input part of MCU control circuit connect, the control terminal of MCU control circuit and the controlled end of soft starting circuit connect.Technical solutions of the utility model are able to solve the problem of electrical equipment can not be detached from from power supply buses and be damaged when there is transient overvoltage or overvoltage in short-term.
Description
Technical field
The utility model relates to switch power technology field, in particular to a kind of overvoltage crowbar and overvoltage protection dress
It sets.
Background technique
With the development of China's power industry, electrical over-voltage protection technique is gradually subject to the people's attention, electrical mistake
The safety of electrical equipment can be improved in voltage protection technology, provides effective safety guarantee for power industry.Overvoltage refers to
Peak value is greater than any voltage for operating normally the corresponding peaks of lower maximum steady state voltage, and in engineering, it refers to that all may be to setting
Standby hurtful dangerous voltage.Overvoltage includes:
Transient overvoltage, duration are Millisecond or shorter；
Transient overvoltage or in short-term overvoltage, duration are relatively long.
The equipment of some unused over-voltage breakings is greater than the maximum voltage value that device can bear there is high pressure and high pressure
When, equipment is damaged due to that cannot be detached from from power supply buses.
Utility model content
The main purpose of the utility model is to provide a kind of overvoltage crowbar, it is intended to solve occur transient overvoltage or
In short-term when overvoltage, electrical equipment can not be detached from from power supply buses and the problem of damage.
To achieve the above object, the utility model proposes a kind of overvoltage crowbar, the overvoltage crowbar includes
Ac power input end, rectification circuit, bus capacitor, soft starting circuit, busbar voltage sample circuit and MCU control circuit；Institute
The power input for stating rectification circuit is connect with the ac power input end, the anode of the output end of the rectification circuit, institute
First sampling end of the first end of stating bus capacitor and the busbar voltage sample circuit with the input terminal of electrical equipment just
Pole connection, the cathode of the output end of the rectification circuit are connect with the power input of the soft starting circuit, the soft start
Second sampling end of the power output end of circuit, the second end of the bus capacitor and the busbar voltage sample circuit is and institute
State the cathode interconnection of the input terminal of electrical equipment, the signal output end of the busbar voltage sample circuit and MCU control electricity
The signal input part on road connects, and the control terminal of the MCU control circuit is connect with the controlled end of the soft starting circuit；
The rectification circuit, the AC power source for inputting the ac power input end are rectified into DC power supply；
The bus capacitor, for being filtered to the DC power supply；
The busbar voltage sample circuit is exported for sampling the voltage parameter of bus capacitor, and by voltage parameter to MCU
Control circuit；
MCU control circuit, for exporting first control signal when the initial voltage parameter on the bus capacitor is zero
Soft start work is carried out to the soft starting circuit to control the soft starting circuit；Voltage parameter on the bus capacitor
When greater than the first predeterminated voltage, output second control signal controls the soft starting circuit to the soft starting circuit and disconnects,
So that the DC power supply stops exporting to the electrical equipment, and decline the voltage on the bus capacitor；As the mother
When the voltage of line capacitance drops to the second predeterminated voltage, output third control signal controls described soft to the soft starting circuit
Start-up circuit re-closes, so that the DC power supply is exported to the electrical equipment, it is the power supply for electrical equipment.
Preferably, the rectification circuit is rectifier bridge, and the power input of the rectifier bridge and the AC power source input
The anode of end connection, the output end of the rectifier bridge is connect with the first end of the bus capacitor, the output end of the rectifier bridge
Cathode connect with the power input of the soft starting circuit.
Preferably, the soft starting circuit includes switching circuit and ON-OFF control circuit；The power supply of the switching circuit is defeated
Enter end to connect with the cathode of the output end of the rectification circuit, the power output end of the switching circuit and the bus capacitor
Second end connection, the controlled end of the switching circuit are connect with the control terminal of the ON-OFF control circuit, the switch control electricity
The controlled end on road is connect with the control terminal of the MCU control circuit.
Preferably, the switching circuit includes first resistor, the first relay and the second relay；First relay
The first end of switch connect with the first end of the switch of second relay, the first end of the switch of first relay
Be the power input of the switching circuit with the connecting node of the first end of the switch of second relay, described second after
The second end of the switch of electric appliance is connect with the first end of the first resistor, the second end of the first resistor with described first after
The second end of the switch of electric appliance connects, the company of the second end of the switch of the second end of the first resistor and first relay
Connect the line of the power output end that node is the switching circuit, the coil both ends of first relay and second relay
Circle both ends are connect with the ON-OFF control circuit.
Preferably, first relay is normally opened relay, and second relay is normally closed relay.
Preferably, the controlled end of the ON-OFF control circuit includes the first controlled end and the second controlled end, the switch control
Circuit processed includes second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, first diode,
Two diodes, first capacitor, the second capacitor, the first triode, the second triode and the first operating voltage input terminal；
The first end of the coil of first relay and the cathode of the first diode are electric with first work
Input terminal connection is pressed, the second end of the coil of first relay is connect with the first end of the second resistance, and described second
The second end of resistance is connect with the collector of first triode with the anode of the first diode, the one or three pole
The emitter of pipe is grounded, and the first of the base stage of first triode, the first end of the 3rd resistor and the first capacitor
End is connect with the first end of the 4th resistance, and the second end of the second end of the first capacitor and the 3rd resistor connects
Ground, the second end of the 4th resistance are the first controlled end of the ON-OFF control circuit, the coil of second relay
The cathode of first end and second diode is connect with the first operating voltage input terminal, the line of second relay
The second end of circle is connect with the first end of the 5th resistance, the second end of the 5th resistance and the sun of second diode
It is extremely connect with the collector of second triode, the emitter ground connection of second triode, second triode
The first end of base stage, the first end of the 6th resistance and second capacitor is connect with the first end of the 7th resistance,
The second end of second capacitor and the second end of the 6th resistance are grounded, and the second end of the 7th resistance is described opens
Close the second controlled end of control circuit.
Preferably, the busbar voltage sample circuit includes the 8th resistance and the 9th resistance；The first of 8th resistance
It holds and is connect with the anode of the input terminal of the electrical equipment with the first end of the bus capacitor, the second of the 8th resistance
End is connect with the first end of the 9th resistance, the connection of the first end of the second end and the 9th resistance of the 8th resistance
Node is the signal output end of the busbar voltage sample circuit, the of the second end of the 9th resistance and the bus capacitor
Two ends are grounded.
Preferably, the signal output end of the MCU control circuit includes the first signal output end and second signal output end,
The MCU control circuit includes MCU chip and the first operating voltage input terminal, the signal input part of the MCU chip with
The signal output end of busbar voltage sample circuit connects, the first signal output end of the MCU chip and switch control electricity
First controlled end on road connects, the second signal output end of the MCU chip and the second controlled end of the ON-OFF control circuit
Connection, the power input of the MCU chip are connect with the first operating voltage input terminal, the ground terminal of the MCU chip
Ground connection.
The utility model also proposes that a kind of over-pressure safety device, the overvoltage crowbar include that over-voltage as described above is protected
Protection circuit.
The utility model overvoltage crowbar includes ac power input end, rectification circuit, bus capacitor, soft start electricity
Road, busbar voltage sample circuit and MCU control circuit, overvoltage crowbar are mounted between electrical equipment and power supply buses, whole
Current circuit, for the AC power source of input to be rectified into direct current, the voltage ginseng of busbar voltage sampling circuit samples bus capacitor
Number simultaneously exports voltage parameter to MCU control circuit, when power supply buses close a floodgate moment, since the initial voltage on bus capacitor is
Zero will form very big moment impact electric current, and MCU control circuit outputs control signals to soft starting circuit control soft start at this time
Circuit soft start prevents dash current from damaging electrical equipment, so that and reliably working, electrical equipment normal using electric equipment are normal
When operation, power supply buses voltage is gradually risen, and bus capacitor charging and both end voltage increase are received when MCU control circuit
When voltage parameter is greater than the first predeterminated voltage, MCU control circuit outputs control signals to soft starting circuit, and soft starting circuit is disconnected
It opens, the input of electrical equipment non-transformer, to prevent electrical equipment from damaging because of overtension, when soft starting circuit disconnects
Afterwards, bus capacitor voltage is begun to decline, when busbar voltage drops to the second predeterminated voltage of MCU control circuit, MCU control electricity
Road outputs control signals to soft starting circuit, and soft starting circuit closure, bus capacitor recharges, to control in power supply line
Voltage keep within a preset range, realize power supply line when there is transient overvoltage or overvoltage in short-term, electrical equipment energy
Operating voltage is controlled by way of being detached from input power in the purpose of a safe range.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the electrical block diagram of one embodiment of the utility model overvoltage crowbar.
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, fall within the protection scope of the utility model.
It is to be appreciated that the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, and cannot
It is interpreted as its relative importance of indication or suggestion or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include at least one of the features.In addition, the skill between each embodiment
Art scheme can be combined with each other, but must be based on can be realized by those of ordinary skill in the art, when technical solution
It will be understood that the combination of this technical solution is not present in conjunction with there is conflicting or cannot achieve when, also not in the utility model
It is required that protection scope within.
The utility model proposes a kind of overvoltage crowbars.
As shown in FIG. 1, FIG. 1 is the electrical block diagram of one embodiment of the utility model overvoltage crowbar, this implementations
In example, which includes ac power input end, rectification circuit 10, soft starting circuit 20, bus capacitor 30, MCU
Control circuit 40 and busbar voltage sample circuit 50；The power input and the ac power input end of the rectification circuit 10
Connection, the first end of positive, the described bus capacitor 30 of the output end of the rectification circuit 10 and busbar voltage sampling electricity
First sampling end on road 50 with the input terminal of electrical equipment anode connect, the cathode of the output end of the rectification circuit 10 and
The power input of the soft starting circuit 20 connects, power output end, the bus capacitor 30 of the soft starting circuit 20
Second end and the busbar voltage sample circuit 50 the second sampling end it is mutual with the cathode of the input terminal of the electrical equipment
Even, the signal output end of the busbar voltage sample circuit 50 is connect with the signal input part of the MCU control circuit 40, described
The control terminal of MCU control circuit 40 is connect with the controlled end of the soft starting circuit 20；
The rectification circuit 10, the AC power source for inputting the ac power input end are rectified into DC power supply；
The bus capacitor 30, for being filtered to the DC power supply；
The busbar voltage sample circuit 50, exports for sampling the voltage parameter of bus capacitor 30, and by voltage parameter
To MCU control circuit 40；
MCU control circuit 40, for when the initial voltage parameter on the bus capacitor 30 is zero, output first to be controlled
Signal controls the soft starting circuit 20 to the soft starting circuit 20 and carries out soft start work；When on the bus capacitor 30
Voltage parameter when being greater than the first predeterminated voltage, output second control signal controls described soft open to the soft starting circuit 20
Dynamic circuit 20 disconnects, so that the DC power supply stops exporting to the electrical equipment, and makes the electricity on the bus capacitor 30
Drops；When the voltage of the bus capacitor 30 drops to the second predeterminated voltage, output third controls signal and soft opens to described
Dynamic circuit 20 is re-closed with controlling the soft starting circuit 20, so that the DC power supply is exported to the electrical equipment, is
The power supply for electrical equipment.
In the present embodiment, soft starting circuit 20 includes a plurality of branch circuit parallel connection between rectification circuit 10 and power supply buses, often
Branch includes switch element and resistance, and resistance value is all different, when the breaker closing moment of power supply line front end,
In be provided with the branch conducting of maximum resistance, the dash current that moment generates that prevents from closing a floodgate exports to electrical equipment electricity consumption is caused to set
Standby damage can be closed by the way that the switch element on controlling brancher is corresponding later, to realize soft start, prevent the hair of overcurrent
It is raw.
When electrical equipment normally starts, filled by soft starting circuit 20 to bus capacitor 30 after the DC power supply of rectification
Electricity, busbar voltage sample circuit acquire the voltage of 30 one end of bus capacitor, and 40 internal storage of MCU control circuit has preset voltage
Threshold value, when 30 voltage of bus capacitor reaches preset over-voltage protection point, i.e. the first predeterminated voltage in MCU control circuit 40, MCU
The output of control circuit 40 order to soft starting circuit 20 controls each branch in soft starting circuit 20 and disconnects, 30 electricity of bus capacitor
Press off beginning slowly decline, when busbar voltage drops to it is very low when, MCU control circuit 40 export control command, soft starting circuit 20
It re-closes, power supply line restores normal at this time, and bus capacitor 30 restarts to charge, so that constantly circulation is realized, so that female
Voltage on line capacitance 30 controls preset first predeterminated voltage in MCU control circuit 40 hereinafter, to make equipment will not be because
Busbar voltage is excessively high and damages.
Technical solutions of the utility model are by using rectification circuit 10, soft starting circuit 20, bus capacitor 30, busbar voltage
Sample circuit 50 and MCU control circuit 40 form a kind of overvoltage crowbar；Overvoltage crowbar is mounted on electrical equipment and supplies
Between goddess of lightning's line, the AC power source of input is rectified into direct current by rectification circuit 10, and busbar voltage sample circuit 50 samples bus
The voltage parameter of capacitor 30 simultaneously exports voltage parameter to MCU control circuit 40, when power supply buses close a floodgate moment, due to bus electricity
Holding the initial voltage on 30 is that zero will form very big moment impact electric current, and MCU control circuit 40 is output control signals at this time
Soft starting circuit 20 controls 20 soft start of soft starting circuit, prevents dash current from damaging equipment, thus it is normal using electric equipment and
Reliable starting, when electrical equipment operates normally, power supply buses voltage is gradually risen, the charging of bus capacitor 30 and both end voltage increasing
Greatly, when the voltage parameter that MCU control circuit 40 receives is greater than the first predeterminated voltage, the output control letter of MCU control circuit 40
Number to soft starting circuit 20, soft starting circuit 20 is disconnected, electrical equipment non-transformer input, to prevent electrical equipment because of voltage mistake
High and damage, after soft starting circuit 20 disconnects, 30 voltage of bus capacitor is begun to decline, when busbar voltage drops to MCU
When the second predeterminated voltage set in control circuit 40, MCU control circuit 40 outputs control signals to soft starting circuit 20, soft start
Circuit 20 is closed, and bus capacitor 30 recharges, so that the voltage controlled in power supply line keeps within a preset range, realizing
When there is transient overvoltage or in short-term overvoltage, electrical equipment can be by way of being detached from come control bus voltage with input power
In the purpose of a safe range.
In the present embodiment, the rectification circuit 10 is rectifier bridge D3, the power input of the rectifier bridge D3 and the friendship
Power input connection is flowed, the anode of the output end of the rectifier bridge D3 is connect with the first end of the bus capacitor 30, described
The cathode of the output end of rectifier bridge D3 is connect with the power input of the soft starting circuit 20.
It should be noted that rectification circuit 10 uses full bridge rectifier bridge D3 in the present embodiment, the alternating current input is realized
Pressure is converted into the DC voltage of output, it is to be understood that rectification circuit 10 may include a variety of different structures, in the present embodiment
It is preferred that rectifier bridge D3, but it is not limited to rectifier bridge D3.
In the present embodiment, the soft starting circuit 20 includes switching circuit 22 and ON-OFF control circuit 21.
Specifically, the power input of the switching circuit 22 is connect with the cathode of the output end of the rectification circuit 10,
The power output end of the switching circuit 22 is connect with the second end of the bus capacitor 30, the controlled end of the switching circuit 22
It is connect with the control terminal of the ON-OFF control circuit 21, the controlled end of the ON-OFF control circuit 21 and the MCU control circuit
40 control terminal connection.
It should be noted that switching circuit 22 is connected on rectifier bridge D3 and bus capacitor 30 wherein between a branch, open
Powered-down road 22 may include a plurality of parallel branch, corresponding, and ON-OFF control circuit 21 equally may be provided with multiple branches, switch control
Circuit 21 processed is acted accordingly according to the control signal that MCU control circuit 40 exports, the switch element in switching circuit 22
Closure disconnects, to control the power input status of electrical equipment.
In the present embodiment, the switching circuit 22 includes first resistor R1, the first relay J1 and the second relay J2.
Specifically, the first end of the switch of the first end of the switch of the first relay J1 and the second relay J2
The connecting node of the first end of the switch of connection, the first end of the switch of the first relay J1 and the second relay J2
For the power input of the switching circuit 22, the second end of the switch of the second relay J2 is with the first resistor R1's
First end connection, the second end of the first resistor R1 connect with the second end of the switch of the first relay J1, and described the
The connecting node of the second end of the switch of the second end of one resistance R1 and the first relay J1 is the switching circuit 22
The coil both ends of power output end, the coil both ends of the first relay J1 and the second relay J2 and the switch are controlled
Circuit 21 processed connects.
In the present embodiment, switching circuit 22 includes two branches, and first branch includes first resistor R1 and the second relay
Device J2, Article 2 branch include the first relay J1, and when the breaker closing moment of power supply line front end, the second relay J2 is led
Logical, the first relay J1 is remained open, and first resistor R1 plays metering function, the dash current output for preventing combined floodgate moment from generating
Electrical equipment is caused to damage to electrical equipment, after electric current is stablized, the first relay J1 is closed, first resistor R1 and second resistance
R2 short circuit, electric current is exported by the first relay J1 to the component of rear end and electrical equipment, and supply current increases, thus real
The soft start of current electric equipment prevents the generation of overcurrent.
When electrical equipment normally starts, filled by the first relay J1 to bus capacitor 30 after the DC power supply of rectification
Electricity, busbar voltage sample circuit acquire the voltage of 30 one end of bus capacitor, and 40 internal storage of MCU control circuit has preset voltage
Threshold value, when 30 voltage of bus capacitor reaches preset over-voltage protection point, i.e. the first predeterminated voltage in MCU controller, MCU control
Each item first relay J1 and second relay J2 of the device output order into the control soft starting circuit 20 of soft starting circuit 20 are disconnected
Open, power supply line disconnects, and 30 voltage of bus capacitor starts slowly to decline, when busbar voltage drops to it is very low when, MCU controller is defeated
Control command out, the second relay J2 are re-closed, and power supply line restores normal at this time, and bus capacitor 30 restarts to charge,
To realize constantly circulation, so that the voltage on bus capacitor 30 controls the preset first default electricity in MCU control circuit 40
Pressure is hereinafter, to make equipment not damage because busbar voltage is excessively high.
In the present embodiment, the first relay J1 is normally opened relay, and the second relay J2 is normally closed relay.
It should be noted that working as the breaker closing moment of power supply line front end, the second relay J2 keeps normally off,
First relay J1 maintains a normally open state, after electric current is stablized, the output control signaling switch control circuit of MCU control circuit 40
21, ON-OFF control circuit 21 controls the first relay J1 closure, to improve the supply current in power supply line, works as busbar voltage
When excessively high, the first relay J1 and the second relay J2 are disconnected according to the signal that ON-OFF control circuit 21 exports, and work as busbar voltage
When being slowly drop down to the second predeterminated voltage, MCU control circuit 40 outputs control signals to switch control signal, ON-OFF control circuit
21 control the second relay J2 closures stablize electricity to be embodied as electrical equipment and provide at this point, the first relay J1 is maintained a normally open
The purpose in source.
In the present embodiment, the controlled end of the ON-OFF control circuit 21 includes the first controlled end and the second controlled end, described
ON-OFF control circuit 21 includes second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th
Resistance R7, first diode D1, the second diode D2, first capacitor C1, the second capacitor C2, the first triode Q1, the two or three pole
Pipe Q2 and the first operating voltage VCC input terminal.
Specifically, the cathode of the first end of the coil of the first relay J1 and the first diode D1 with it is described
The of the connection of first operating voltage VCC input terminal, the second end of the coil of the first relay J1 and the second resistance R2
The anode of one end connection, the second end of the second resistance R2 and the first diode D1 are with the first triode Q1's
Collector connection, the emitter ground connection of the first triode Q1, the base stage of the first triode Q1, the 3rd resistor R3
First end and the first end of the first capacitor C1 connect with the first end of the 4th resistance R4, the first capacitor C1
Second end and the second end of the 3rd resistor R3 be grounded, the second end of the 4th resistance R4 is the switch control electricity
The cathode of first controlled end on road 21, the first end of the coil of the second relay J2 and the second diode D2 are and institute
The connection of the first operating voltage VCC input terminal is stated, the second end of the coil of the second relay J2 is with the 5th resistance R5's
First end connection, the anode of the second end of the 5th resistance R5 and the second diode D2 with the second triode Q2
Collector connection, the second triode Q2 emitter ground connection, the base stage of the second triode Q2, the 6th resistance
The first end of R6 and the first end of the second capacitor C2 are connect with the first end of the 7th resistance R7, second capacitor
The second end of C2 and the second end of the 6th resistance R6 are grounded, and the second end of the 7th resistance R7 is the switch control
Second controlled end of circuit 21.
It should be noted that, when the breaker closing moment of power supply line front end, the second relay J2 is protected in the present embodiment
Normally off is held, the first relay J1 maintains a normally open state, and after electric current is stablized, MCU control circuit 40 exports high level to the
One triode Q1, the first triode Q1 conducting, the coil of the first relay J1, which is powered, to be closed, the first relay J1 and the second relay
Device J2 is kept closed,
When busbar voltage is excessively high, MCU control circuit 40 exports high level to the second triode Q2 and output low level
It is connected to the first triode Q1, the second triode Q2, the first triode Q1 is closed, so that the second relay J2 of control is powered and breaks
It opens, the coil losing electricity of the first relay J1 maintains a normally open state, when busbar voltage is slowly drop down to the second predeterminated voltage, MCU
Control circuit 40 exports two-way low level to ON-OFF control circuit 21, the first triode and the second triode and is turned off the second relay
Device J2 power loss keeps normally off, and the first relay J1 maintains a normally open state, and power supply line restores normal at this time, bus capacitor 30
Restart to charge, so that constantly circulation is realized, so that the voltage on bus capacitor 30 is controlled and preset in MCU control circuit 40
The first predeterminated voltage hereinafter, to making equipment not damage because busbar voltage is excessively high.
In the present embodiment, the busbar voltage sample circuit includes the 8th resistance R8 and the 9th resistance R9.
Specifically, the first end of the first end of the 8th resistance R8 and the bus capacitor 30 with the electrical equipment
Input terminal anode connection, the second end of the 8th resistance R8 connect with the first end of the 9th resistance R9, described the
The connecting node of the second end of eight resistance R8 and the first end of the 9th resistance R9 is the busbar voltage sample circuit 50
Signal output end, the second end of the 9th resistance R9 and the second end of the bus capacitor 30 are grounded.
It should be noted that the voltage that busbar voltage sample circuit 50 acquires is the first end of bus capacitor 30, the 8th electricity
Resistance R8 and the 9th resistance R9 plays the role of partial pressure, so that MCU control circuit 40 be made to can receive mother can bear and accurate
Line voltage value.
In the present embodiment, the signal output end of the MCU control circuit 40 includes the first signal output end and second signal
Output end, the control circuit include MCU chip U1 and the first operating voltage VCC input terminal, the letter of the MCU chip U1
Number input terminal is connect with the signal output end of busbar voltage sample circuit 50, the first signal output end of the MCU chip U1 with
First controlled end of the ON-OFF control circuit 21 connects, and the second signal output end of the MCU chip U1 and the switch are controlled
Second controlled end of circuit 21 processed connects, the power input of the MCU chip U1 and the first operating voltage VCC input terminal
Connection, the ground terminal ground connection of the MCU chip U1.
It should be noted that MCU chip U1 internal processor has prestored corresponding program, according to the voltage signal pair received
Low and high level should be exported to the first triode Q1 and the second triode Q2, so that the first triode Q1 controls the first relay J1's
Work and the second triode Q2 control the work of the second relay J2, and when power supply line closes a floodgate moment, the first relay J1 is protected
Hold normally closed, the second relay J2 is maintained a normally open, and plays the role of current limliting with the second relay J2 resistance connecting, when electric current is stablized
Afterwards, MCU controller exports high level to the first triode Q1, the first triode Q1 conducting, and the first relay J1 obtains electric actuation, supplies
Electric current becomes larger, thus realize soft start, when the voltage signal that MCU chip U1 is received is greater than the first predeterminated voltage, MCU core
Piece U1 exports high level to the second triode Q2 and output low level to the first triode Q1 respectively, controls the one or three pole respectively
Pipe Q1 and the second triode Q2 is disconnected, so that electrical equipment is detached to avoid from power supply line in overtension
After the problem of damaging because of high pressure, the first relay J1 and the second relay J2 are disconnected, 30 voltage of bus capacitor is begun to decline,
When voltage drops to the second predeterminated voltage, MCU chip U1 low level to the second triode Q2, the second triode Q2 disconnection, the
Two relay J2 revert to normally off, and power supply line starts to power again, and charge for bus capacitor 30, to control electricity consumption
The operating voltage of equipment is maintained in preset voltage range, realizes the purpose of voltage protection.
The utility model also proposes a kind of over-pressure safety device, which includes overvoltage crowbar, the mistake
The specific structure of voltage protection circuit is referring to above-described embodiment, since this over-pressure safety device uses the complete of above-mentioned all embodiments
Portion's technical solution, therefore at least all beneficial effects brought by the technical solution with above-described embodiment, herein no longer one by one
It repeats.
The above is only the preferred embodiment of the present invention, and therefore it does not limit the scope of the patent of the utility model,
It is all under the inventive concept of the utility model, equivalent structure made based on the specification and figures of the utility model becomes
It changes, or directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.
Claims (9)
1. a kind of overvoltage crowbar, which is characterized in that including ac power input end, rectification circuit, bus capacitor, soft start
Circuit, busbar voltage sample circuit and MCU control circuit；The power input of the rectification circuit and the AC power source input
End connection, the first end of positive, the described bus capacitor of the output end of the rectification circuit and the busbar voltage sample circuit
The first sampling end with the input terminal of electrical equipment anode connect, the cathode of the output end of the rectification circuit with it is described soft
The power input of start-up circuit connects, the power output end of the soft starting circuit, the second end of the bus capacitor and institute
The second sampling end for stating busbar voltage sample circuit is interconnected with the cathode of the input terminal of the electrical equipment, the busbar voltage
The signal output end of sample circuit is connect with the signal input part of the MCU control circuit, the control terminal of the MCU control circuit
It is connect with the controlled end of the soft starting circuit；
The rectification circuit, the AC power source for inputting the ac power input end are rectified into DC power supply；
The bus capacitor, for being filtered to the DC power supply；
The busbar voltage sample circuit for sampling the voltage parameter of bus capacitor, and voltage parameter is exported to MCU and is controlled
Circuit；
MCU control circuit, for when the initial voltage parameter on the bus capacitor is zero, exporting first control signal to institute
Soft starting circuit is stated to control the soft starting circuit and carry out soft start work；When the voltage parameter on the bus capacitor is greater than
When the first predeterminated voltage, output second control signal controls the soft starting circuit to the soft starting circuit and disconnects, so that
The DC power supply stops exporting to the electrical equipment, and declines the voltage on the bus capacitor；When the bus electricity
When the voltage of appearance drops to the second predeterminated voltage, output third control signal controls the soft start to the soft starting circuit
Circuit re-closes, so that the DC power supply is exported to the electrical equipment, it is the power supply for electrical equipment.
2. overvoltage crowbar as described in claim 1, which is characterized in that the rectification circuit is rectifier bridge, the rectification
The power input of bridge is connect with the ac power input end, anode and the bus capacitor of the output end of the rectifier bridge
First end connection, the cathode of the output end of the rectifier bridge connect with the power input of the soft starting circuit.
3. overvoltage crowbar as described in claim 1, which is characterized in that the soft starting circuit includes switching circuit and opens
Close control circuit；The power input of the switching circuit is connect with the cathode of the output end of the rectification circuit, the switch
The power output end of circuit is connect with the second end of the bus capacitor, the controlled end of the switching circuit and the switch control
The control terminal of circuit connects, and the controlled end of the ON-OFF control circuit is connect with the control terminal of the MCU control circuit.
4. overvoltage crowbar as claimed in claim 3, which is characterized in that the switching circuit includes first resistor, first
Relay and the second relay；
The first end of the switch of first relay is connect with the first end of the switch of second relay, described first after
The connecting node of the first end of the switch of the first end of the switch of electric appliance and second relay is the electricity of the switching circuit
The second end of source input terminal, the switch of second relay is connect with the first end of the first resistor, the first resistor
Second end connect with the second end of the switch of first relay, the second end of the first resistor and first relay
The connecting node of the second end of the switch of device is the power output end of the switching circuit, the coil both ends of first relay
And the coil both ends of second relay are connect with the ON-OFF control circuit.
5. overvoltage crowbar as claimed in claim 4, which is characterized in that first relay is normally opened relay, institute
Stating the second relay is normally closed relay.
6. overvoltage crowbar as claimed in claim 4, which is characterized in that the controlled end of the ON-OFF control circuit includes the
One controlled end and the second controlled end, the ON-OFF control circuit include second resistance, 3rd resistor, the 4th resistance, the 5th resistance,
6th resistance, the 7th resistance, first diode, the second diode, first capacitor, the second capacitor, the first triode, the two or three pole
Pipe and the first operating voltage input terminal；
The first end of the coil of first relay and the cathode of the first diode are defeated with first operating voltage
Enter end connection, the second end of the coil of first relay is connect with the first end of the second resistance, the second resistance
Second end and the anode of the first diode connect with the collector of first triode, first triode
Emitter ground connection, the first end of the base stage of first triode, the first end of the 3rd resistor and the first capacitor are equal
It being connect with the first end of the 4th resistance, the second end of the second end of the first capacitor and the 3rd resistor is grounded,
The second end of 4th resistance be the ON-OFF control circuit the first controlled end, the first of the coil of second relay
The cathode of end and second diode is connect with the first operating voltage input terminal, the coil of second relay
Second end is connect with the first end of the 5th resistance, and the second end of the 5th resistance and the anode of second diode are equal
It is connect with the collector of second triode, the emitter ground connection of second triode, the base stage of second triode,
The first end of 6th resistance and the first end of second capacitor are connect with the first end of the 7th resistance, and described
The second end of two capacitors and the second end of the 6th resistance are grounded, and the second end of the 7th resistance is the switch control
Second controlled end of circuit.
7. overvoltage crowbar as described in claim 1, which is characterized in that the busbar voltage sample circuit includes the 8th electricity
Resistance and the 9th resistance；
The anode of the first end of 8th resistance and the first end of the bus capacitor with the input terminal of the electrical equipment
Connection, the second end of the 8th resistance are connect with the first end of the 9th resistance, the second end of the 8th resistance and institute
The connecting node for stating the first end of the 9th resistance is the signal output end of the busbar voltage sample circuit, the 9th resistance
Second end and the second end of the bus capacitor are grounded.
8. overvoltage crowbar as claimed in claim 6, which is characterized in that the signal output end packet of the MCU control circuit
The first signal output end and second signal output end are included, the MCU control circuit includes MCU chip and first operating voltage
The signal input part of input terminal, the MCU chip is connect with the signal output end of busbar voltage sample circuit, the MCU chip
The first signal output end connect with the first controlled end of the ON-OFF control circuit, the output of the second signal of the MCU chip
End is connect with the second controlled end of the ON-OFF control circuit, the power input of the MCU chip and the first work electricity
Press input terminal connection, the ground terminal ground connection of the MCU chip.
9. a kind of over-pressure safety device, which is characterized in that including the overvoltage protection electricity as described in claim 1-8 any one
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820920851.1U CN208299427U (en) | 2018-06-13 | 2018-06-13 | Overvoltage crowbar and over-pressure safety device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820920851.1U CN208299427U (en) | 2018-06-13 | 2018-06-13 | Overvoltage crowbar and over-pressure safety device |
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| CN208299427U true CN208299427U (en) | 2018-12-28 |
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| CN201820920851.1U Active CN208299427U (en) | 2018-06-13 | 2018-06-13 | Overvoltage crowbar and over-pressure safety device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110311355A (en) * | 2019-06-28 | 2019-10-08 | 苏州浪潮智能科技有限公司 | System, method and the server power supply of overvoltage protection are carried out to server power supply |
| CN110518563A (en) * | 2019-09-11 | 2019-11-29 | 广东志高暖通设备股份有限公司 | The method and its MCU of overvoltage protection, air-conditioning equipment |
| CN111030077A (en) * | 2019-12-23 | 2020-04-17 | 中国电子科技集团公司第十八研究所 | Shunt regulation circuit for solar cell array switch and regulation method based on shunt regulation circuit |
| CN112467969A (en) * | 2020-11-05 | 2021-03-09 | 珠海格力电器股份有限公司 | Starting control device and method of frequency converter and magnetic suspension system |
| CN112564471A (en) * | 2020-11-27 | 2021-03-26 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | Working sequence control circuit in two-stage conversion circuit and method thereof |
| CN112821350A (en) * | 2020-12-31 | 2021-05-18 | Tcl空调器(中山)有限公司 | Voltage abnormity protection circuit, control method and air conditioner |
| CN112956098A (en) * | 2020-07-15 | 2021-06-11 | 深圳欣锐科技股份有限公司 | Isolation circuit and isolation method |
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2018
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110311355A (en) * | 2019-06-28 | 2019-10-08 | 苏州浪潮智能科技有限公司 | System, method and the server power supply of overvoltage protection are carried out to server power supply |
| CN110518563A (en) * | 2019-09-11 | 2019-11-29 | 广东志高暖通设备股份有限公司 | The method and its MCU of overvoltage protection, air-conditioning equipment |
| CN110518563B (en) * | 2019-09-11 | 2021-10-22 | 广东志高暖通设备股份有限公司 | Overvoltage protection method, MCU and air conditioning equipment |
| CN111030077A (en) * | 2019-12-23 | 2020-04-17 | 中国电子科技集团公司第十八研究所 | Shunt regulation circuit for solar cell array switch and regulation method based on shunt regulation circuit |
| CN111030077B (en) * | 2019-12-23 | 2021-08-13 | 中国电子科技集团公司第十八研究所 | Shunt regulation circuit for solar cell array switch and regulation method based on shunt regulation circuit |
| CN112956098A (en) * | 2020-07-15 | 2021-06-11 | 深圳欣锐科技股份有限公司 | Isolation circuit and isolation method |
| CN112467969A (en) * | 2020-11-05 | 2021-03-09 | 珠海格力电器股份有限公司 | Starting control device and method of frequency converter and magnetic suspension system |
| CN112467969B (en) * | 2020-11-05 | 2021-12-03 | 珠海格力电器股份有限公司 | Starting control device and method of frequency converter and magnetic suspension system |
| CN112564471A (en) * | 2020-11-27 | 2021-03-26 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | Working sequence control circuit in two-stage conversion circuit and method thereof |
| CN112821350A (en) * | 2020-12-31 | 2021-05-18 | Tcl空调器(中山)有限公司 | Voltage abnormity protection circuit, control method and air conditioner |
| CN112821350B (en) * | 2020-12-31 | 2023-09-19 | Tcl空调器(中山)有限公司 | Voltage abnormality protection circuit, control method and air conditioner |
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