CN108962676B - A kind of anti-decompression device of direct current displaced type based on T-type bridge structure - Google Patents

A kind of anti-decompression device of direct current displaced type based on T-type bridge structure Download PDF

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Publication number
CN108962676B
CN108962676B CN201810805146.1A CN201810805146A CN108962676B CN 108962676 B CN108962676 B CN 108962676B CN 201810805146 A CN201810805146 A CN 201810805146A CN 108962676 B CN108962676 B CN 108962676B
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full
controlled switch
grid
instruction
main control
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CN108962676A (en
Inventor
宋崇辉
徐涛
刁乃哲
孙先瑞
韩涛
王堃
杨明
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Northeastern University China
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Northeastern University China
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
    • H01H47/04—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current
    • H01H47/043—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current making use of an energy accumulator

Abstract

The present invention relates to a kind of anti-decompression devices of the direct current displaced type based on T-type bridge structure；Apparatus of the present invention include: power supply unit, T-type bridge switching circuit, voltage detecting circuit, current detection circuit, driving circuit, main control unit and load；Power supply unit setting is connected with the input terminal of T-type bridge switching circuit respectively there are three types of power supply, and the public output of T-type bridge switch unit and load connect；The connection of the input terminal of current detection circuit and voltage detecting circuit and main control unit, the input terminal of driving circuit and the output end of main control unit connect；Main control unit is inputted to driving circuit and is instructed according to the electric current of load and/or the voltage of power supply unit, and T-type bridge switching circuit realizes at least one power supply and load conduction of power supply unit.Apparatus of the present invention can rapidly switch to backup DC power source power supply in power grid AC power source decompression, guarantee that A.C. contactor is reliably attracted, and apparatus of the present invention are small in size, low manufacture cost, have very high practicability.

Description

A kind of anti-decompression device of direct current displaced type based on T-type bridge structure
Technical field
The present invention relates to electric equipment protection fields, anti-more particularly to a kind of direct current displaced type based on T-type bridge structure Decompression device.
Background technique
In order to solve the problems, such as that contactor caused by decompression is threaded off, it is necessary to take anti-decompression measure.Currently, these protective devices For the angle of working principle, can substantially be divided into two major classes, one kind be it is compensation, one kind is displaced type, wherein displaced type Two classes can be divided into again, exchange displaced type and direct current displaced type.Compensation power network fluctuation protective device is the best one kind of effect Power network fluctuation protective device, however this kind of device has bulky, especially its energy storage and radiating module；It is at high cost, about It is 30 to 50 times for needing load to be protected such as contactor control loop cost；The popular feature of wiring difficulty, simultaneously because its The architectural characteristic being serially connected between alternating current and load has and introduces new this fatal problem of fault point, leads to general work Industry enterprise can not select it as general power network fluctuation protective device.It can only can just consider in some epochmaking front equipment ends Use this kind of device.
The advantage of displaced type power network fluctuation protective device is not need to intervene the normal of power grid when power grid does not break down Operation, only when detect power grid go wrong just switch to backup power source instead of power grid power supply.This kind of power network fluctuation protection dress It sets in most cases due to the time for only needing to take over network operation 600ms or so, to avoid power network fluctuation, therefore does not need Huge backup power source, rectifier and inverter, therefore general volume can be made smaller, cost is also much lower.Switching circuit Structure can be described as the problem of limitation displaced type power network fluctuation protective device maximum, because of either response speed relay how soon Device switch, due to the limitation of its mechanical structure, can not all accomplish 6ms switch speed below, and load in handoff procedure Contactor will lead to discontinuous current since circuit disconnects, and can accelerate the speed of contactor tripping.Exist for the above-mentioned prior art The problem of and deficiency, propose a kind of anti-decompression device of the direct current displaced type based on T-type bridge structure, it is too long to can solve switching time Mouth problem is taken off with A.C. contactor caused by discontinuous current.
Summary of the invention
(1) technical problems to be solved
In order to solve the above problem of the prior art, it is anti-that the present invention provides a kind of direct current displaced type based on T-type bridge structure Decompression device.
(2) technical solution
In order to achieve the above object, the main technical schemes that the present invention uses include:
Power supply unit, T-type bridge switching circuit, voltage detecting circuit, current detection circuit, driving circuit, main control unit and negative It carries；
Wherein, the T-type bridge switching circuit includes: three input terminals and a public output；
The power supply unit setting is connect with three input terminals of T-type bridge switching circuit respectively there are three types of power supply, the T-type bridge The public output of switch unit and load connect；
The current detection circuit and voltage detecting circuit are connect with the input terminal of the main control unit, the driving circuit Input terminal connect with the output end of the main control unit；
The current detection circuit is used to detect the electric current of load, and voltage detecting circuit is used to detect the voltage of power supply unit；
Main control unit is inputted according to the electric current of the load and/or the voltage of the power supply unit to the input terminal of driving circuit Instruction so that T-type bridge switching circuit connect with the output end of driving circuit realize the power supply unit at least one power supply and The load conduction.
Optionally, power supply unit includes:
Power grid AC power source, AC/DC rectification circuit, energy storage device and DC/DC translation circuit；
Wherein, DC/DC translation circuit includes: an input terminal, the first output end and second output terminal；
The input terminal of the AC/DC rectification circuit is connect with the power grid AC power source, the AC/DC rectification circuit it is defeated Outlet is connect with the input terminal of the energy storage device, the input of the output end of the energy storage device and the DC/DC translation circuit End connection；
Connecting pin of first output end of the DC/DC translation circuit as positive polarity DC standby power；
Connecting pin of the second output terminal of the DC/DC translation circuit as negative polarity d. c backup power source；
Three kinds of power supplys of the power supply unit are respectively positive polarity DC standby power, negative polarity d. c backup power source and power grid AC power source.
Optionally, T-type bridge switching circuit includes:
First full-controlled switch (S1), the second full-controlled switch (S2), third full-controlled switch (S3) and the 4th full-control type It switchs (S4)；
Wherein, first full-controlled switch (S1), the second full-controlled switch (S2), third full-controlled switch (S3) and Four full-control types (S4) switch includes: anode, cathode and control electrode；
First full-controlled switch (S1), the second full-controlled switch (S2), third full-controlled switch (S3) and the 4th are complete The control electrode of control type switch (S4) is driven the control of circuit；
The power grid AC power source is connect with third full-controlled switch (S3) anode；
The connecting pin of the positive polarity DC standby power is connect with the cathode of second full-controlled switch (S2)；
The connecting pin of the negative polarity d. c backup power source is connect with the anode of the 4th full-controlled switch (S4)；
The cathode of first full-controlled switch (S1) is connect with the cathode of the third full-controlled switch (S3)；
The cathode and the 4th full-controlled switch of third full-controlled switch (S3) anode, the second full-controlled switch (S2) (S4) three input terminals of the anode respectively as the T-type bridge switching circuit；
The anode of second full-controlled switch (S2), the cathode of the 4th full-controlled switch (S4) and described first are entirely The anode of control type switch (S1) is connect with the public output of the T-type bridge switch unit.
Optionally, the first full-controlled switch (S1), the second full-controlled switch (S2), third full-controlled switch (S3) and the 4th The structure of full-controlled switch (S4) is identical, wherein the first full-controlled switch (S1) includes:
IGBT and fast recovery diode；
The IGBT is insulated gate bipolar transistor, and the IGBT is in parallel with the fast recovery diode (FRD), described The emitter of IGBT and the anode of fast recovery diode are connect with the anode of first full-controlled switch；
The collector of the IGBT and the cathode of fast recovery diode are connect with the cathode of first full-controlled switch；
The gate pole of the IGBT is connect with the control electrode of the first full-controlled switch.
Optionally, the load is A.C. contactor.
Optionally, the main control unit includes:
First sample port and the second sample port；
The current direction of the current detection circuit acquisition load, and it is sent to the first sampling end of the main control unit Mouthful；
Wherein, the sense of current of the load includes: first direction and second direction；
The voltage detecting circuit acquires the positive polarity DC standby power voltage value, negative polarity d. c standby electricity respectively Source voltage value, power grid AC supply voltage value peak value and power grid AC supply voltage value instantaneous value, and it is sent to the master control list Second sample port of member；
Wherein, positive polarity DC standby power voltage value is expressed as VDD, negative polarity d. c backup power source voltage value is expressed as VEE, the voltage value peak value of power grid AC power source is expressed as Vgrid, the voltage value instantaneous value of power grid AC power source is expressed as ugrid。
A kind of control method of the anti-decompression device of direct current displaced type based on T-type bridge structure, the control method include:
When power grid AC power source is by T-type bridge switching circuit and load conduction, the main control unit receives the electric current The V that the current direction and the voltage detecting circuit for the load that detection circuit is sent are sentgrid、ugrid、VDDAnd VEE；
The V that the main control unit is sent according to the current direction of the load and/or the voltage detecting circuitgrid、 ugrid、VDDAnd VEE, generate the instruction sent to driving circuit.
Optionally, described instruction includes:
First instruction, the second instruction, third instruction, the 4th instruction and the 5th instruction；
Wherein,
First instruction includes: the first full-controlled switch (S1) conducting for driving T-type bridge switching circuit, the second full-controlled switch (S2) it disconnects, the information of third full-controlled switch (S3) conducting and the disconnection of the 4th full-controlled switch (S4)；
Second instruction includes: the first full-controlled switch (S1) conducting for driving T-type bridge switching circuit, the second full-controlled switch (S2) conducting, the information that third full-controlled switch (S3) disconnects and the 4th full-controlled switch (S4) disconnects；
Third instruction includes: the first full-controlled switch (S1) disconnection for driving T-type bridge switching circuit, the second full-controlled switch (S2) it disconnects, the information of third full-controlled switch (S3) conducting and the conducting of the 4th full-controlled switch (S4)；
4th instruction includes: the first full-controlled switch (S1) disconnection for driving T-type bridge switching circuit, the second full-controlled switch (S2) conducting, the information that third full-controlled switch (S3) disconnects and the 4th full-controlled switch (S4) disconnects；
5th instruction includes: the first full-controlled switch (S1) disconnection for driving T-type bridge switching circuit, the second full-controlled switch (S2) it disconnects, third full-controlled switch (S3) disconnects and the information of the 4th full-controlled switch (S4) conducting.
Optionally, the control method further include:
If VgridGreater than preset value, then the main control unit sends the first instruction to driving circuit；
When what driving circuit executed is the first instruction, if main control unit judges VgridIt is less than and/or is equal to preset value, and negative Load electric current is first direction, then the main control unit sends the second instruction to driving circuit；
When what driving circuit executed is the first instruction, if main control unit judges VgridIt is less than and/or is equal to preset value, and negative Load electric current is second direction, then the main control unit sends third instruction to driving circuit；
When what driving circuit executed is the second instruction, if main control unit judges VgridIt is less than and/or is equal to preset value, ugrid< =VDDAnd load current is first direction, then the main control unit sends the 4th instruction to driving circuit after preset time period；
When what driving circuit executed is third instruction, if main control unit judges VgridIt is less than and/or is equal to preset value, ugrid> =VEEAnd load current is second direction, then the main control unit sends the 5th instruction to driving circuit after preset time period.
Optionally,
What if driving circuit executed is the 4th instruction, if main control unit judges VgridGreater than in preset value, and load electricity Stream is first direction, then the main control unit sends the second instruction to driving circuit；
What if driving circuit executed is the 5th instruction, if main control unit judges VgridGreater than in preset value, and load electricity Stream is second direction, then the main control unit sends third instruction to driving circuit；
What if driving circuit executed is the second instruction, if main control unit judges VgridGreater than preset value and ugrid>VDD, then The main control unit sends the first instruction to driving circuit；
What if driving circuit executed is third instruction, if main control unit judges VgridGreater than preset value and ugrid<VEE, then The main control unit sends the first instruction to driving circuit.
(3) beneficial effect
The beneficial effects of the present invention are:
When power grid AC power source decompression occurs, backup DC power source power supply rapidly can be switched to by power grid, and load Electric current do not occur discontinuous current, guarantee that A.C. contactor is reliably attracted.Further, since powered after switching using DC power supply, The design difficulty for substantially reducing backup power source part reduces corresponding protective device volume, reduces equipment cost.This is in electricity Gas engineering field has very high practicability especially in the application of electric equipment protection device.
Detailed description of the invention
Fig. 1 is the anti-decompression schematic diagram of device of the direct current displaced type based on T-type bridge that one embodiment of the invention provides；
T-type bridge switches main circuit current road when the power grid AC power source normal power supply that Fig. 2 provides for one embodiment of the invention Diameter figure；
Fig. 3 is the structure chart that one embodiment of the invention mentions the first full-controlled switch；
Fig. 4 A is the power grid AC power source decompression that one embodiment of the invention provides and i0Power grid AC power source is to load when > 0 Supply current path profile；
Fig. 4 B is the power grid AC power source decompression that one embodiment of the invention provides and i0Power grid AC power source and anode when > 0 Property DC power supply powering load current path figure；
Fig. 4 C is the power grid AC power source decompression that one embodiment of the invention provides and i0Positive polarity DC power supply is to negative when > 0 Carry supply current path profile；
Fig. 4 D is the power grid AC power source decompression that one embodiment of the invention provides and i0Power grid AC power source is to load when < 0 Supply current path profile；
Fig. 4 E is the power grid AC power source decompression that one embodiment of the invention provides and i0Power grid AC power source and cathode when < 0 Property DC power supply powering load current path figure；
Fig. 4 F is the power grid AC power source decompression that one embodiment of the invention provides and i0Negative polarity d. c power supply is to negative when < 0 Carry supply current path profile；
Fig. 5 A is the switchback power grid AC power source that one embodiment of the invention provides and i0Positive polarity DC standby power when > 0 Powering load current path figure；
Fig. 5 B is the switchback power grid AC power source that one embodiment of the invention provides and i0Power grid AC power source and anode when > 0 Property DC power supply powering load current path figure；
Fig. 5 C is the switchback power grid AC power source that one embodiment of the invention provides and i0Power grid AC power source is to load when > 0 Supply current path profile；
Fig. 5 D is the switchback power grid AC power source that one embodiment of the invention provides and i0Negative polarity d. c backup power source when < 0 Powering load current path figure；
Fig. 5 E is the switchback power grid AC power source that one embodiment of the invention provides and i0Power grid AC power source and cathode when < 0 Property DC power supply powering load current path figure；
Fig. 5 F is the switchback power grid AC power source that one embodiment of the invention provides and i0Power grid AC power source is to load when < 0 Supply current path profile.
Specific embodiment
In order to preferably explain the present invention, in order to understand, with reference to the accompanying drawing, by specific embodiment, to this hair It is bright to be described in detail.
Embodiment one
As shown in Figure 1, the present invention provides a kind of anti-decompression devices of the direct current displaced type based on T-type bridge structure, comprising: electricity Source portion, T-type bridge switching circuit, voltage detecting circuit, current detection circuit, driving circuit, main control unit and load；
Specifically, power supply unit includes:
Power grid AC power source, AC/DC rectification circuit, energy storage device and DC/DC translation circuit；
Wherein, DC/DC translation circuit includes: an input terminal, the first output end and second output terminal；
The input terminal of the AC/DC rectification circuit is connect with the power grid AC power source, the AC/DC rectification circuit it is defeated Outlet is connect with the input terminal of the energy storage device, the input of the output end of the energy storage device and the DC/DC translation circuit End connection；
Connecting pin of first output end of the DC/DC translation circuit as positive polarity DC standby power；
Connecting pin of the second output terminal of the DC/DC translation circuit as negative polarity d. c backup power source；
Three kinds of power supplys of the power supply unit are respectively positive polarity DC standby power, negative polarity d. c backup power source and power grid AC power source；
DC standby power includes positive polarity DC standby power and negative polarity d. c backup power source in the present embodiment.
Specifically, the driving circuit includes: an input terminal and four output ends；,
For example, the output end of driving circuit are as follows: the first output end, second output terminal, third output end and the 4th are defeated Outlet；
Specifically, for example the switching circuit of T-type bridge described in the present embodiment includes: the first full-controlled switch S1, second Full-controlled switch S2, third full-controlled switch S3 and the 4th full-controlled switch S4；
T-type bridge switching circuit includes three input terminals and a public output in the present embodiment；
For example, as shown in Figure 1, it is respectively 1,2 and 3 that T-type bridge switching circuit, which includes three input terminals, public output It is 4；
Wherein, the first full-controlled switch S1, the second full-controlled switch S2, third full-controlled switch S3, the 4th full-control type Switch S4 includes: anode, cathode and control electrode；
Specifically, the first full-controlled switch, the second full-controlled switch, third full-controlled switch, the 4th full-controlled switch It is connect with the output end of driving circuit, for example, driving circuit includes multiple output ends；
For example, the first output end of S1 and driving circuit connects, and the second output terminal of S2 and driving circuit connects, S3 It is connect with the third output end of driving circuit, the 4th output end connection of S4 and driving circuit,.
The power grid AC power source is connect with the third full-controlled switch S3 anode；
The connecting pin of the positive polarity DC standby power is connect with the cathode of the second full-controlled switch S2；
The connecting pin of the negative polarity d. c backup power source is connect with the anode of the 4th full-controlled switch S4；
The cathode of the first full-controlled switch S1 is connect with the cathode of the third full-controlled switch S3；
The third full-controlled switch S3 anode, the cathode of the second full-controlled switch S2 and the sun of the 4th full-controlled switch S4 Pole is respectively three input terminals of the T-type bridge switching circuit；
The cathode and first full-control type of the anode of the second full-controlled switch S2, the 4th full-controlled switch S4 The anode of switch S1 is connect with the public output 4 of the T-type bridge switch unit.
Specifically, as shown in Fig. 2, the first full-controlled switch, the second full-controlled switch, third full-controlled switch, the 4th Full-controlled switch structure is identical, wherein the first full-controlled switch includes:
IGBT and fast recovery diode；
The IGBT is insulated gate bipolar transistor, and the IGBT is in parallel with the fast recovery diode, the IGBT Emitter and the anode of fast recovery diode connect with the anode of first full-controlled switch；
The collector of the IGBT and the cathode of fast recovery diode are connect with the cathode of first full-controlled switch；
The gate pole of the IGBT is connect with the control electrode of the first full-controlled switch.
Specifically, main control unit includes: the first sample port and the second sample port；
The current direction of the current detection circuit acquisition load, and it is sent to the first sampling end of the main control unit Mouthful；
Wherein, the sense of current of the load includes: first direction and second direction；
The voltage detecting circuit acquires the positive polarity DC standby power voltage value, negative polarity d. c standby electricity respectively Source voltage value, the voltage value and power grid AC power source of power grid AC power source, and be sent to the second of the main control unit and adopt Sample port；
Wherein, the voltage value of power grid AC power source includes: peak value and instantaneous value；
For example, the electric current of load hereinafter referred to as i0, i0Direction is only used for reference to setting, such as when load current direction For i is denoted as shown in Fig. 1 when first direction0>0；I is denoted as when load current direction is second direction shown in Fig. 10<0；
For example, preset value is denoted as V in following embodimentm, positive polarity DC standby power voltage value is denoted as VDD, cathode Property DC standby power voltage value is denoted as VEE, the voltage value peak value of power grid AC power source is denoted as Vgrid, the electricity of power grid AC power source Pressure value instantaneous value is denoted as ugrid, work as Vgrid≤ VmShi Jizuo power grid AC power source decompression, abbreviation power grid decompression；
In the embodiment of the present invention, current detection circuit and voltage detecting circuit are connect with the input terminal of the main control unit, The input terminal of the driving circuit is connect with the output end of the main control unit；
The electric current i for the load that main control unit is detected according to current detection circuit0And/or the voltage detecting circuit inspection The voltage V of the power supply unit of surveygrid、ugrid、VDDAnd VEEIt inputs and instructs to the input terminal of driving circuit, so that defeated with driving circuit The T-type bridge switching circuit of outlet connection realizes at least one power supply and the load conduction of the power supply unit.
Embodiment two
The present invention provides a kind of control methods of anti-decompression device of the direct current displaced type based on T-type bridge structure；
When power grid AC power source is by T-type bridge switching circuit and load conduction, the main control unit receives the electric current The V that the current direction and the voltage detecting circuit for the load that detection circuit is sent are sentgrid、ugrid、VDDAnd VEE。
The V that the main control unit is sent according to the current direction of the load and/or the voltage detecting circuitgrid、 ugrid、VDDAnd VEE, generate the instruction sent to driving circuit.
In specifically implementation process, described instruction includes:
First instruction includes: the first full-controlled switch (S1) conducting for driving T-type bridge switching circuit, the second full-controlled switch (S2) it disconnects, the information of third full-controlled switch (S3) conducting and the disconnection of the 4th full-controlled switch (S4)；
Second instruction includes: the first full-controlled switch (S1) conducting for driving T-type bridge switching circuit, the second full-controlled switch (S2) conducting, the information that third full-controlled switch (S3) disconnects and the 4th full-controlled switch (S4) disconnects；
Third instruction includes: the first full-controlled switch (S1) disconnection for driving T-type bridge switching circuit, the second full-controlled switch (S2) it disconnects, the information of third full-controlled switch (S3) conducting and the conducting of the 4th full-controlled switch (S4)；
4th instruction includes: the first full-controlled switch (S1) disconnection for driving T-type bridge switching circuit, the second full-controlled switch (S2) conducting, the information that third full-controlled switch (S3) disconnects and the 4th full-controlled switch (S4) disconnects；
5th instruction includes: the first full-controlled switch (S1) disconnection for driving T-type bridge switching circuit, the second full-controlled switch (S2) it disconnects, third full-controlled switch (S3) disconnects and the information of the 4th full-controlled switch (S4) conducting.
Embodiment three
This example implementation provides a kind of control method of anti-decompression device of the direct current displaced type based on T-type bridge structure；
When power grid AC power source is by T-type bridge switching circuit and load conduction, the main control unit receives the electric current The V that the current direction and the voltage detecting circuit for the load that detection circuit is sent are sentgrid、ugrid、VDDAnd VEE。
The V that the main control unit is sent according to the current direction of the load and/or the voltage detecting circuitgrid、 ugrid、VDDAnd VEE, generate the instruction sent to driving circuit.
If Vgrid>Vm, then the main control unit sends the first instruction to driving circuit；
At this point, being load supplying by power grid AC power source.
When detecting power grid AC power source decompression when being load supplying by power grid AC power source below:
When what driving circuit executed is the first instruction, if main control unit judges Vgrid≤ Vm, and i0> 0, then the master control list Member sends the second instruction to driving circuit；
It is at this time load supplying by power grid AC power source.
When what driving circuit executed is the first instruction, if main control unit judges Vgrid≤ Vm, and i0< 0, then the master control list Member sends third instruction to driving circuit；
It is at this time load supplying by power grid AC power source.
When what driving circuit executed is the second instruction, if main control unit judges Vgrid≤ Vm、ugrid≤ VDDAnd i0> 0, then The main control unit sends the 4th instruction to driving circuit after preset time period；
Specified otherwise, wherein preset time period refers to delay regular time section, same as below；
It is simultaneously load by power grid AC power source and positive polarity backup power source before S1 reliable turn-off after executing the 4th instruction Power supply；It is load supplying by positive polarity DC standby power after shutdown.
When what driving circuit executed is third instruction, if main control unit judges Vgrid≤ Vm、ugrid>=VEE, and i0< 0, then The main control unit sends the 5th instruction to driving circuit after preset time period.
It is simultaneously load by power grid AC power source and negative polarity backup power source before S3 reliable turn-off after executing the 5th instruction Power supply；It is load supplying by negative polarity d. c backup power source after shutdown.
It is spare by using direct current in order to keep the electric current of load circuit continuous when decompression has occurred in power grid AC power source Power supply be load circuit power supply, when detecting that power grid AC power source is restored to normal, apparatus of the present invention can switchback to use The power supply of power grid AC power source is by the control method that DC standby power switchback to power grid AC power source is load supplying:
What if driving circuit executed is the 4th instruction, if main control unit judges Vgrid>Vm, and i0> 0, then the master control list Member sends the second instruction to driving circuit；
It is at this time load supplying by positive polarity DC standby power.
What if driving circuit executed is the 5th instruction, if main control unit judges VgridGreater than in preset value, and load electricity Stream is second direction, then the main control unit sends third instruction to driving circuit；
It is at this time load supplying by negative polarity d. c backup power source.
What if driving circuit executed is the second instruction, if main control unit judges Vgrid>VmAnd ugrid>VDD, then the master control Unit sends the first instruction to driving circuit；
At this point, being simultaneously load supplying by power grid AC power source and positive polarity backup power source before S2 reliable turn-off；Shutdown Afterwards, restore by power grid AC power source to be load supplying.
What if driving circuit executed is third instruction, if main control unit judges Vgrid>VmAnd ugrid<VEE, then the master control Unit sends the first instruction to driving circuit.
At this point, being simultaneously load supplying by power grid AC power source and negative polarity backup power source before S2 reliable turn-off；Shutdown Afterwards, restore by power grid AC power source to be load supplying.
Example IV
This example implementation provides a kind of control method of anti-decompression device of the direct current displaced type based on T-type bridge structure；
In the present embodiment for example, positive polarity DC standby power voltage value is expressed as VDD, negative polarity d. c standby electricity Source voltage value is expressed as VEE, the voltage value peak value of power grid AC power source is expressed as Vgrid, the voltage value of power grid AC power source is instantaneous Value is expressed as ugrid。
According to VEE、VDD、ugridAnd VgridMeasured value in the actual process include following five kinds of situations:
Specified otherwise, after the delay 10us in the present embodiment is equal to above-mentioned preset time period；
A1, power grid AC power source are normal: working as Vgrid>VmWhen, i.e., when network voltage is normal, switching tube S1, S3 is connected, disconnects S2, S4, so that network voltage is applied directly in load, backup power source is not to load supplying, as shown in figure 3, wherein L1 is electric current Path is flowed through when positive, L2 is that electric current flows through path when reversed.
A2, power grid AC power source forward direction decompression: work as Vgrid≤ VmWhen, i.e., when decompression occurs for network voltage, detect i0It is positive and negative, If preparation executes switching moment and detects i0> 0, in order to guarantee that electric current is continuous, need to load supply forward current, then at this point, Switching tube S3 cut-off signal is given first, and switching tube S2 Continuity signal, since current direction is positive at this time, electric current flows through S3 inverse parallel Diode and S1, as shown in Figure 4 A.Be delayed 10us, it is ensured that S3 is reliably disconnected.When detecting network voltage ugrid≤ VDDWhen, S1 cut-off signal is given, it is standby by power grid AC power source and positive polarity direct current before S1 disconnection since S2 can immediately be connected at this time With power supply simultaneously powering load, as shown in Figure 4 B.After S1 is reliably disconnected, load supplying is completely by positive polarity direct current standby electricity Source provides, and as shown in Figure 4 C, this just completes whole change of current movements, and load contact device electric current in handoff procedure is always maintained at company It is continuous, without interrupt status.
A3, the reversed decompression of power grid AC power source: work as Vgrid≤ VmWhen, i.e., when decompression occurs for network voltage, detect i0It is positive and negative, If preparation executes switching moment and detects i0< 0, in order to guarantee that electric current is continuous, need to load supply reverse current, then at this point, Switching tube S1 cut-off signal is given first, and switching tube S4 Continuity signal, since current direction is negative at this time, electric current flows through S1 inverse parallel Diode and S3, as shown in Figure 4 D.Be delayed 10us, it is ensured that S1 is reliably disconnected.When detecting network voltage ugrid>=VEEWhen, S3 cut-off signal is given, it is standby by power grid AC power source and negative polarity d. c before S3 disconnection since S4 can immediately be connected at this time With power supply simultaneously powering load, as shown in Figure 4 E.After S3 is reliably disconnected, load supplying is completely by negative polarity d. c standby electricity Source provides, and as illustrated in figure 4f, this just completes whole change of current movements, and load contact device electric current in handoff procedure is always maintained at company It is continuous, without interrupt status.
A4, backup DC power source forward direction switchback power grid: in DC standby power power supply, work as Vgrid>VmWhen, i.e., from power grid When voltage decompression is restored to normal condition, i is detected0It is positive and negative, if i0> 0, S1 Continuity signal is given, at this time positive polarity DC standby power Powering load, as shown in Figure 5A.It is to be checked to measure network voltage ugrid>VDDWhen, S3 is connected, and give S2 cut-off signal, it is disconnected in S2 Before opening, by power grid AC power source and positive polarity DC standby power powering load simultaneously, as shown in Figure 5 B.Reliably break in S2 After opening, load supplying is provided by power grid AC power source completely, and as shown in Figure 5 C, this just completes whole change of current movements, load contact Device electric current in handoff procedure is always maintained at continuously, without interrupt status.
The reversed switchback power grid of A5, backup DC power source: in DC standby power power supply, work as Vgrid>VmWhen, i.e., from power grid When voltage decompression is restored to normal condition, i is detected0It is positive and negative, if i0< 0, S3 Continuity signal is given, at this time negative polarity d. c backup power source Powering load, as shown in Figure 5 D.It is to be checked to measure network voltage ugrid<VEEWhen, S1 is connected, and give S4 cut-off signal, it is disconnected in S4 Before opening, by power grid AC power source and negative polarity d. c backup power source powering load simultaneously, as shown in fig. 5e.Reliably break in S4 After opening, load supplying is provided by power grid AC power source completely, and as illustrated in figure 5f, this just completes whole change of current movements, load contact Device electric current in handoff procedure is always maintained at continuously, without interrupt status.
In conclusion rapidly can be switched to backup DC power source when power grid AC power source decompression occurs by power grid and supply Electricity, and discontinuous current does not occur for the electric current loaded, guarantees that A.C. contactor is reliably attracted.Further, since using direct current after switching Power supply power supply substantially reduces the design difficulty of backup power source part, reduces corresponding protective device volume, reduce equipment at This.This especially in the application of electric equipment protection device, has very high practicability in electrical engineering field.
Finally, it should be noted that above-described embodiments are merely to illustrate the technical scheme, rather than to it Limitation；Although the present invention is described in detail referring to the foregoing embodiments, those skilled in the art should understand that: It can still modify to technical solution documented by previous embodiment, or to part of or all technical features into Row equivalent replacement；And these modifications or substitutions, it does not separate the essence of the corresponding technical solution various embodiments of the present invention technical side The range of case.

Claims (10)

1. a kind of anti-decompression device of direct current displaced type based on T-type bridge structure characterized by comprising
Power supply unit, T-type bridge switching circuit, voltage detecting circuit, current detection circuit, driving circuit, main control unit and load；
Wherein, the T-type bridge switching circuit includes: three input terminals and a public output；
The power supply unit setting is connect with three input terminals of T-type bridge switching circuit respectively there are three types of power supply, the T-type bridge switching The public output of unit and load connect；
The current detection circuit and voltage detecting circuit are connect with the input terminal of the main control unit, the driving circuit it is defeated Enter end to connect with the output end of the main control unit；
The current detection circuit is used to detect the electric current of load, and voltage detecting circuit is used to detect the voltage of power supply unit；
Main control unit refers to according to the electric current of the load and/or the voltage of the power supply unit to the input of the input terminal of driving circuit It enables, so that the T-type bridge switching circuit connecting with the output end of driving circuit realizes at least one power supply and the institute of the power supply unit State load conduction.
2. the apparatus according to claim 1, which is characterized in that power supply unit includes:
Power grid AC power source, AC/DC rectification circuit, energy storage device and DC/DC translation circuit；
Wherein, DC/DC translation circuit includes: an input terminal, the first output end and second output terminal；
The input terminal of the AC/DC rectification circuit is connect with the power grid AC power source, the output end of the AC/DC rectification circuit It is connect with the input terminal of the energy storage device, the input terminal of the output end of the energy storage device and the DC/DC translation circuit connects It connects；
Connecting pin of first output end of the DC/DC translation circuit as positive polarity DC standby power；
Connecting pin of the second output terminal of the DC/DC translation circuit as negative polarity d. c backup power source；
Three kinds of power supplys of the power supply unit are respectively that positive polarity DC standby power, negative polarity d. c backup power source are exchanged with power grid Power supply.
3. the apparatus of claim 2, which is characterized in that T-type bridge switching circuit includes:
First full-controlled switch (S1), the second full-controlled switch (S2), third full-controlled switch (S3) and the 4th full-controlled switch (S4)；
Wherein, first full-controlled switch (S1), the second full-controlled switch (S2), third full-controlled switch (S3) and the 4th are complete Control type (S4) switch includes: anode, cathode and control electrode；
First full-controlled switch (S1), the second full-controlled switch (S2), third full-controlled switch (S3) and the 4th full-control type The control electrode of switch (S4) is driven the control of circuit；
The power grid AC power source is connect with third full-controlled switch (S3) anode；
The connecting pin of the positive polarity DC standby power is connect with the cathode of second full-controlled switch (S2)；
The connecting pin of the negative polarity d. c backup power source is connect with the anode of the 4th full-controlled switch (S4)；
The cathode of first full-controlled switch (S1) is connect with the cathode of the third full-controlled switch (S3)；
Third full-controlled switch (S3) anode, the cathode of the second full-controlled switch (S2) and the 4th full-controlled switch (S4) Three input terminals of the anode respectively as the T-type bridge switching circuit；
The anode of second full-controlled switch (S2), the 4th full-controlled switch (S4) cathode and first full-control type The anode of switch (S1) is connect with the public output of the T-type bridge switch unit.
4. device according to claim 3, which is characterized in that the first full-controlled switch (S1), the second full-controlled switch (S2), third full-controlled switch (S3) is identical with the structure of the 4th full-controlled switch (S4), wherein the first full-controlled switch (S1) Include:
IGBT and fast recovery diode；
The IGBT is insulated gate bipolar transistor, and the IGBT is in parallel with the fast recovery diode (FRD), the IGBT Emitter and the anode of fast recovery diode connect with the anode of first full-controlled switch；
The collector of the IGBT and the cathode of fast recovery diode are connect with the cathode of first full-controlled switch；
The gate pole of the IGBT is connect with the control electrode of the first full-controlled switch.
5. device according to claim 4, which is characterized in that
The load is A.C. contactor.
6. device according to claim 5, which is characterized in that the main control unit includes:
First sample port and the second sample port；
The current direction of the current detection circuit acquisition load, and it is sent to the first sample port of the main control unit；
Wherein, the sense of current of the load includes: first direction and second direction；
The voltage detecting circuit acquires the positive polarity DC standby power voltage value, negative polarity d. c backup power source electricity respectively Pressure value, power grid AC supply voltage value peak value and power grid AC supply voltage value instantaneous value, and it is sent to the main control unit Second sample port；
Wherein, positive polarity DC standby power voltage value is expressed as VDD, negative polarity d. c backup power source voltage value is expressed as VEE, electricity The voltage value peak value of net AC power source is expressed as Vgrid, the voltage value instantaneous value of power grid AC power source is expressed as ugrid。
7. a kind of control method based on any described device of claim 3-6, which is characterized in that the control method includes:
When power grid AC power source is by T-type bridge switching circuit and load conduction, the main control unit receives the current detecting The V that the current direction and the voltage detecting circuit for the load that circuit is sent are sentgrid、ugrid、VDDAnd VEE；
The V that the main control unit is sent according to the current direction of the load and/or the voltage detecting circuitgrid、ugrid、VDD And VEE, generate the instruction sent to driving circuit.
8. control method according to claim 7, which is characterized in that described instruction includes:
First instruction, the second instruction, third instruction, the 4th instruction and the 5th instruction；
Wherein,
First instruction includes: the first full-controlled switch (S1) conducting for driving T-type bridge switching circuit, the second full-controlled switch (S2) It disconnects, the information of third full-controlled switch (S3) conducting and the disconnection of the 4th full-controlled switch (S4)；
Second instruction includes: the first full-controlled switch (S1) conducting for driving T-type bridge switching circuit, the second full-controlled switch (S2) Conducting, the information that third full-controlled switch (S3) disconnects and the 4th full-controlled switch (S4) disconnects；
Third instruction includes: the first full-controlled switch (S1) disconnection for driving T-type bridge switching circuit, the second full-controlled switch (S2) It disconnects, the information of third full-controlled switch (S3) conducting and the conducting of the 4th full-controlled switch (S4)；
4th instruction includes: the first full-controlled switch (S1) disconnection for driving T-type bridge switching circuit, the second full-controlled switch (S2) Conducting, the information that third full-controlled switch (S3) disconnects and the 4th full-controlled switch (S4) disconnects；
5th instruction includes: the first full-controlled switch (S1) disconnection for driving T-type bridge switching circuit, the second full-controlled switch (S2) It disconnects, third full-controlled switch (S3) disconnects and the information of the 4th full-controlled switch (S4) conducting.
9. control method according to claim 8, which is characterized in that the control method further include:
If VgridGreater than preset value, then the main control unit sends the first instruction to driving circuit；
When what driving circuit executed is the first instruction, if main control unit judges VgridIt is less than and/or is equal to preset value, and loads electricity Stream is first direction, then the main control unit sends the second instruction to driving circuit；
When what driving circuit executed is the first instruction, if main control unit judges VgridIt is less than and/or is equal to preset value, and loads electricity Stream is second direction, then the main control unit sends third instruction to driving circuit；
When what driving circuit executed is the second instruction, if main control unit judges VgridIt is less than and/or is equal to preset value, ugrid≤ VDD And load current is first direction, then the main control unit sends the 4th instruction to driving circuit after preset time period；
When what driving circuit executed is third instruction, if main control unit judges VgridIt is less than and/or is equal to preset value, ugrid>=VEE And load current is second direction, then the main control unit sends the 5th instruction to driving circuit after preset time period.
10. control method according to claim 9, which is characterized in that the control method further include:
What if driving circuit executed is the 4th instruction, if main control unit judges VgridGreater than preset value, and load current is first Direction, then the main control unit sends the second instruction to driving circuit；
What if driving circuit executed is the 5th instruction, if main control unit judges VgridGreater than preset value, and load current is second Direction, then the main control unit sends third instruction to driving circuit；
What if driving circuit executed is the second instruction, if main control unit judges VgridGreater than preset value and ugrid>VDD, then described Main control unit sends the first instruction to driving circuit；
What if driving circuit executed is third instruction, if main control unit judges VgridGreater than preset value and ugrid<VEE, then described Main control unit sends the first instruction to driving circuit.
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CN101393819A (en) * 2008-10-28 2009-03-25 福州大学 Anti-flashover intelligent AC contactor
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