CN108695830A - Breaker of plastic casing undervoltage tripping device and undervoltage tripping method - Google Patents
Breaker of plastic casing undervoltage tripping device and undervoltage tripping method Download PDFInfo
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- CN108695830A CN108695830A CN201810756507.8A CN201810756507A CN108695830A CN 108695830 A CN108695830 A CN 108695830A CN 201810756507 A CN201810756507 A CN 201810756507A CN 108695830 A CN108695830 A CN 108695830A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1255—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to internal faults, e.g. by monitoring ripple in output voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
A kind of breaker of plastic casing undervoltage tripping device of present invention offer and undervoltage tripping method, breaker of plastic casing undervoltage tripping device include:Low-pass filter circuit, rectification circuit, high-voltage signal absorbing circuit, voltage signal sampling circuit, trip circuit, bleeder circuit, regulator circuit, MCU and driving circuit.Advantage:(1) duty ratio of driving circuit output voltage changes according to the variation of supply voltage, it is smaller that voltage gets over high duty ratio, voltage more low duty ratio is bigger, the effective voltage at tripping coil both ends can be thus set to maintain the working condition of a balance in voltage change, trip line coil temperature rise caused by overtension is reduced, reduces tripping coil caused by brownout and fails.(2) low-pass filter circuit forms EMI filter circuit using two common mode inductances and safety capacitance, can effectively inhibit conduction interference of the tripping coil to external power supply, while increasing the assimilation effect to surge.
Description
Technical field
The invention belongs to breaker of plastic casing design fields, and in particular to a kind of breaker of plastic casing undervoltage tripping device with
And undervoltage tripping method.
Background technology
With the development of low-voltage electrical apparatus, breaker of plastic casing undervoltage tripping device is generally answered in low voltage distribution circuit
With, however, being not quite similar in the principle of breaker of plastic casing undervoltage tripping device design, have Sucking-assisting type also and have it is self-priming, but not
Manage which kind of mode is both needed to maintain the attracting state of tripping coil.When being worked due to tripping coil be in long energized state, power consumption compared with
Greatly, make tripping coil increase temperature with voltage also to increase, and do not do conduction interference processing, tripping coil can week in continue working
Phase property generates noise to power supply, can conduct noise into main circuit power, to influence the work of miscellaneous equipment.
Invention content
In view of the defects existing in the prior art, the present invention provides a kind of breaker of plastic casing undervoltage tripping device and under-voltage de-
Button method can effectively solve the above problems.
The technical solution adopted by the present invention is as follows:
The present invention provides a kind of breaker of plastic casing undervoltage tripping device, including:Low-pass filter circuit, rectification circuit, high pressure
Signal absorption circuit, voltage signal sampling circuit, trip circuit, bleeder circuit, regulator circuit, MCU and driving circuit;
The input terminal of the low-pass filter circuit is connect with external power supply, and the output end of the low-pass filter circuit is connected to
The input terminal of the rectification circuit, the output end of the rectification circuit are connected to the input terminal of the high-voltage signal absorbing circuit;
The output end of the high-voltage signal absorbing circuit is divided into three branches, and first branch is connected to the voltage signal sampling circuit
Input terminal, the output end of the voltage signal sampling circuit is connected to the sampling end of the MCU;Second branch is connected to institute
The input terminal of trip circuit is stated, the output end of trip circuit is connected to driving circuit;Third branch is connected to the partial pressure electricity
The input terminal on road, the 1st output end of the bleeder circuit are connected to the input terminal of the regulator circuit;The regulator circuit it is defeated
Outlet is connected to the feeder ear of the MCU;2nd output end of the bleeder circuit is connected to the feeder ear of driving circuit;It is described
The control terminal of MCU is connected to the control terminal of the driving circuit, is controlled in the trip circuit and is threaded off by the driving circuit
The state of coil.
Preferably, the low-pass filter circuit includes varistor (RV1), the 1st capacitance (C1), the 1st inductance (L1) and the 2nd
Inductance (L2);It is installed in parallel varistor (RV1) and the 1st electricity successively between positive pole leading-out terminal and power cathode leading-out terminal
After holding (C1), formed in power cathode leading-out terminal the 2nd inductance (L2) of series connection in positive pole leading-out terminal the 1st inductance (L1) of series connection
Low-pass filter circuit.
Preferably, the high-voltage signal absorbing circuit includes the 13rd capacitance (C13), and the 13rd capacitance (C13) is connected in parallel on
Between positive pole leading-out terminal and power cathode leading-out terminal, and connect with the output end of the rectification circuit.
Preferably, the driving circuit includes the 13rd resistance (R13), the 14th resistance (R14), the 15th resistance (R15), driving
Chip (U1), the 8th capacitance (C8), the 9th capacitance (C9) and metal-oxide-semiconductor (Q1);
The trip circuit includes the 9th rectifier diode (D9), the 10th rectifier diode (D10) and tripping coil (L3);
Wherein, the input pin of the driving chip (U1) is connect with the output end of the MCU, in the driving chip
(U1) the 13rd resistance (13) is installed between input pin and grounding pin;The energization pins of the driving chip (U1) arrive
In the supply line of bleeder circuit output, the 8th capacitance (C8) being connected in parallel and the 9th capacitance (C9) are installed, it is described
8th capacitance (C8) and the 9th capacitance (C9) form electric capacity of voltage regulation;The 1st output pin series connection institute of the driving chip (U1)
State the 14th resistance (14), the 2nd output pin series connection the 15th resistance (15) of the driving chip (U1);14th resistance
(14) after the output end of output end and the 15th resistance (15) is combined into all the way, it is connected to the grid of the metal-oxide-semiconductor (Q1);Institute
It states the source electrode of metal-oxide-semiconductor (Q1) and power cathode leading-out terminal that bleeder circuit exports is connect, the drain electrode and the 10th of the metal-oxide-semiconductor (Q1)
The anode connection of rectifier diode (D10), the anode of the cathode and the 9th rectifier diode (D9) of the 10th rectifier diode (D10)
Connection, the cathode of the 9th rectifier diode (D9) are connect with positive pole leading-out terminal;Also, the tripping coil (L3) with connect
The 9th rectifier diode (D9) and the 10th rectifier diode (D10) it is in parallel, by the 9th rectifier diode (D9) and
10th rectifier diode (D10) absorbs the interference signal that tripping coil (L3) hold mode generates.
The present invention also provides a kind of undervoltage tripping methods of breaker of plastic casing undervoltage tripping device, include the following steps:
Step 1, external power supply AC230V/380V initially enters low-pass filter circuit, absorbs wave by low-pass filter circuit
After gushing signal and low-pass filtering, into rectification circuit;
Step 2, the AC rectification of power supply after direct current, is entered high-voltage signal absorbing circuit by rectification circuit;
Step 3, high-voltage signal absorbing circuit absorbs the high-voltage signal in the direct current after rectification, the electricity after being improved
Source;Power supply after conditioning is divided into three branches, and first branch enters voltage signal sampling circuit, by voltage signal sampling electricity
Road acquires power supply voltage signal, and collected power supply voltage signal is transferred to MCU;Second branch enters trip circuit
It is that trip circuit and metal-oxide-semiconductor (Q1) provide power supply with the metal-oxide-semiconductor (Q1) of driving circuit;Third branch enters bleeder circuit,
After dividing and absorbing input power high-voltage signal, a branch enters regulator circuit, another branch enters driving electricity
Lu Zhong provides power supply for driving circuit;
Step 4, after regulator circuit carries out voltage stabilizing to power supply, MCU is entered, and then power to MCU;
Step 5, for MCU, the collected power supply voltage signal of voltage signal sampling circuit is handled, judges electricity
Whether source voltage signal is normal, if normally, thening follow the steps 6;If abnormal, show under-voltage or over-pressed phenomenon occur,
Execute step 7;
Step 6, MCU exports the drive signal of certain duty ratio according to the size of power supply voltage signal, the drive signal
Duty ratio increases continuous reduction with power supply voltage signal, which exports to driving circuit, the conducting to metal-oxide-semiconductor (Q1)
It is controlled with by state, and then tripping coil (L3) attracting state is kept with certain duty ratio voltage and maintains trip line
The operating voltage for enclosing (L3) is steady state value, and concrete mode is:
Drive signal is replaced with certain duty ratio between high level and low level;When drive signal is high level,
Metal-oxide-semiconductor (Q1) is connected, and tripping coil (L3) is powered and keeps attracting state;When drive signal is low level, metal-oxide-semiconductor (Q1) is cut
Only, tripping coil (L3) short time powers off, and when tripping coil (L3) is not threaded off, drive signal switchs to high level again, makes dropout
Coil (L3) keeps attracting state, and tripping coil (L3) is thus made to keep attracting state;Also, due to the duty ratio of drive signal
Increase continuous reduction with power supply voltage signal, therefore, when power supply voltage signal increases, in a time cycle, high electricity
The flat duration tails off, and low duration becomes larger, and therefore, tripping coil (L3) conduction time tails off, and power-off time becomes larger,
In a time cycle, the average value of tripping coil (L3) terminal voltage maintains steady state value;
Wherein, in tripping coil (L3) course of normal operation, the 9th rectifier diode (D9) and the 10th rectifier diode
(D10) interference signal that tripping coil (L3) hold mode generates is absorbed.
Step 7, MCU controls metal-oxide-semiconductor (Q1) and is continuously cut-off state, and the tripping coil (L3) of trip circuit is electric and stops protecting
State is held, therefore, tripping coil (L3) action, and then breaker of plastic casing is made to disconnect.
Breaker of plastic casing undervoltage tripping device provided by the invention and undervoltage tripping method have the following advantages:
(1) duty ratio of driving circuit output voltage changes according to the variation of supply voltage, voltage more high duty ratio more
Small, voltage more low duty ratio is bigger, thus the effective voltage at tripping coil both ends can be made to maintain one in voltage change
The working condition of balance reduces trip line coil temperature rise caused by overtension, reduces tripping coil caused by brownout
Failure.
(2) low-pass filter circuit forms EMI filter circuit using two common mode inductances and safety capacitance, can effectively press down
Tripping coil processed increases the assimilation effect to surge to the conduction interference of external power supply;
(3) due to controlling driving circuit state by MCU, this undervoltage tripping device not only can be real when under-voltage
Existing tripping function can also realize over-pressed tripping function in certain overvoltage region.
Description of the drawings
Fig. 1 is the schematic diagram of breaker of plastic casing undervoltage tripping device provided by the invention;
Fig. 2 is the circuit diagram of breaker of plastic casing undervoltage tripping device provided by the invention;
Fig. 3 is the variation relation figure of supply voltage provided by the invention and duty ratio.
Specific implementation mode
In order to make the technical problems, technical solutions and beneficial effects solved by the present invention be more clearly understood, below in conjunction with
Accompanying drawings and embodiments, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein only to
It explains the present invention, is not intended to limit the present invention.
The present invention provides a kind of breaker of plastic casing undervoltage tripping device, for in the potential circuit of AC230V or AC380
The major loop that breaker of plastic casing is actively disconnected when generating under-voltage or overvoltage, to protect electrical equipment and personal safety.
With reference to figure 1 and Fig. 2, breaker of plastic casing undervoltage tripping device includes:Low-pass filter circuit, rectification circuit, high pressure letter
Number absorbing circuit, voltage signal sampling circuit, trip circuit, bleeder circuit, regulator circuit, MCU and driving circuit.
The input terminal of low-pass filter circuit is connect with external power supply, and the output end of low-pass filter circuit is connected to rectification circuit
Input terminal, the output end of rectification circuit is connected to the input terminal of high-voltage signal absorbing circuit;High-voltage signal absorbing circuit it is defeated
Outlet is divided into three branches, and first branch is connected to the input terminal of voltage signal sampling circuit, voltage signal sampling circuit
Output end is connected to the sampling end of MCU;Second branch is connected to the input terminal of trip circuit, the output end connection of trip circuit
To driving circuit;Third branch is connected to the input terminal of bleeder circuit, and the 1st output end of bleeder circuit is connected to regulator circuit
Input terminal;The output end of regulator circuit is connected to the feeder ear of MCU;2nd output end of bleeder circuit is connected to driving circuit
Feeder ear;The control terminal of MCU is connected to the control terminal of driving circuit, and tripping coil in trip circuit is controlled by driving circuit
State.
Each main circuit is discussed in detail below:
(1) low-pass filter circuit
Low-pass filter circuit includes varistor RV1, the 1st capacitance C1, the 1st inductance L1 and the 2nd inductance L2;In positive pole
After being installed in parallel varistor RV1 and the 1st capacitance C1 between leading-out terminal and power cathode leading-out terminal successively, in positive pole outlet
Series connection the 1st inductance L1 in end forms low-pass filter circuit in power cathode leading-out terminal the 2nd inductance L2 of series connection.Varistor RV1 is used
In absorption surging signal.
In the present invention, low-pass filter circuit forms EMI filter circuit using two common mode inductances and safety capacitance, i.e.,:1st
Capacitance C1, the 1st inductance L1 and the 2nd inductance L2 form EMI filter circuit, and effectively tripping coil can be inhibited to external power supply
Conduction interference, while increasing the assimilation effect to surge.
(2) rectification circuit
Rectification circuit is by the 1st rectifier diode D1, the 2nd rectifier diode D2, the 3rd rectifier diode D3 and the 4th rectification two
Pole pipe D4 compositions, for carrying out rectifying operation to electric current.Its structural reference Fig. 2, the positive pole leading-out terminal of low-pass filter circuit
It is connect respectively with the cathode of the anode of the 1st rectifier diode D1 and the 2nd rectifier diode D2;The power cathode of low-pass filter circuit
Leading-out terminal is connect with the cathode of the anode of the 3rd rectifier diode D3 and the 4th rectifier diode D4 respectively;1st rectifier diode D1
Cathode and the cathode of the 3rd rectifier diode D3 connect together, form the positive pole leading-out terminal of rectification circuit;2nd rectification
The anode of diode D2 is connected together with the anode of the 4th rectifier diode D4, forms the power cathode leading-out terminal of rectification circuit.
(3) high-voltage signal absorbing circuit
High-voltage signal absorbing circuit includes the 13rd capacitance C13, and the 13rd capacitance C13 is connected in parallel on positive pole leading-out terminal and power supply
Between cathode leading-out terminal, and connect with the output end of rectification circuit.High-voltage signal absorbing circuit is believed for high pressure after absorbing rectification
Number.
(4) voltage signal sampling circuit
Voltage signal sampling circuit is by the 9th resistance R9, the 10th resistance R10, the 11st resistance R11, the 12nd resistance R12, the 16th
Resistance R16, the 6th capacitance C6, the 2nd bi-directional voltage stabilizing pipe VZ2 compositions;
After 16th resistance R16, the 12nd resistance R12, the 11st resistance R11 and the 6th capacitance C6 series connection, it is connected in parallel on positive pole and goes out
Between line end and power cathode leading-out terminal;9th resistance R9 and the 2nd bi-directional voltage stabilizing pipe VZ2 are in parallel with the 6th capacitance C6;10th electricity
An end of resistance R10 is connected to the circuit between the 11st resistance R11 and the 6th capacitance C6, another sampling end for terminating to MCU.
(5) bleeder circuit
Bleeder circuit is by the 7th resistance R7, the 8th resistance R8, the 3rd capacitance C3, transient diode TVS1, the 1st resistance R1, the 2nd
Resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 1st bi-directional voltage stabilizing pipe VZ1 and triode T1 groups
At.
After 7th resistance R7, the 8th resistance R8 and the 3rd capacitance C3 connect, it is connected in parallel on positive pole leading-out terminal and power cathode goes out
Between line end;Transient diode TVS1 is in parallel with the 3rd capacitance C3;1st resistance R1, the 2nd resistance R2, the 3rd resistance R3, the 4th resistance
R4, the 5th resistance R5 and the 6th resistance R6 are two-by-two after parallel connection, and one end is connect with positive pole leading-out terminal, and the other end is divided into two branch
Road, a branch are connected to the cathode of the 1st bi-directional voltage stabilizing pipe VZ1, anode and the power cathode outlet of the 1st bi-directional voltage stabilizing pipe VZ1
End connection;Another branch is connected to the base stage of triode T1;The collector of triode T1 is connected to the electricity of the 7th resistance R7 and the 8th
Hinder the circuit between R8;The emitter of triode T1 is divided into two branches, and a branch is connected to the positive input of the 3rd capacitance C3
End;Another branch is connected to bleeder circuit power supply output interface.
For bleeder circuit, the 1st resistance R1, the 2nd resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th electricity
Resistance R6, the 1st bi-directional voltage stabilizing pipe VZ1 and triode T1 are used to control divide after regulator circuit input power voltage, transient state two
Pole pipe TVS1 is for absorbing regulator circuit input power high-voltage signal.
(6) regulator circuit
Regulator circuit is made of the 4th capacitance C4, the 3rd chip U3, the 11st capacitance C11, the 12nd capacitance C12, wherein the 4th capacitance
C4 is used to stablize the voltage of regulator circuit input power, and C11, C12 are used to stablize the voltage of regulator circuit out-put supply.
(7)MCU
MCU is chip U2, for analyzing AD samplings and output drive signal.
(8) driving circuit and trip circuit
Driving circuit include the 13rd resistance R13, the 14th resistance R14, the 15th resistance R15, driving chip U1, the 8th capacitance C8,
9th capacitance C9 and metal-oxide-semiconductor Q1;8th capacitance C8, the 9th capacitance C9 are the electric capacity of voltage regulation of driving circuit power supply;
Trip circuit includes the 9th rectifier diode D9, the 10th rectifier diode D10 and tripping coil L3;
Wherein, the output end of the input pin of driving chip U1 and MCU connect, driving chip U1 input pin and connect
13rd resistance 13 is installed between ground pin;In the supply line that the energization pins of driving chip U1 are exported to bleeder circuit, installation
The 8th capacitance C8 being connected in parallel and the 9th capacitance C9, the 8th capacitance C8 and the 9th capacitance C9 form electric capacity of voltage regulation;Driving chip U1's
1st output pin the 14th resistance 14 of series connection, the 2nd output pin the 15th resistance 15 of series connection of driving chip U1;14th resistance 14
After the output end of output end and the 15th resistance 15 is combined into all the way, it is connected to the grid of metal-oxide-semiconductor Q1;The source electrode and partial pressure of metal-oxide-semiconductor Q1
The power cathode leading-out terminal of circuit output connects, and the drain electrode of metal-oxide-semiconductor Q1 is connect with the anode of the 10th rectifier diode D10, and the 10th
The cathode of rectifier diode D10 is connect with the anode of the 9th rectifier diode D9, and the cathode and power supply of the 9th rectifier diode D9 are just
Pole leading-out terminal connection;Also, tripping coil L3 is in parallel with concatenated 9th rectifier diode D9 and the 10th rectifier diode D10, leads to
The 9th rectifier diode D9 and the 10th rectifier diode D10 is crossed, the interference signal that tripping coil L3 hold modes generate is absorbed.
The present invention also provides a kind of undervoltage tripping methods of breaker of plastic casing undervoltage tripping device, include the following steps:
Step 1, external power supply AC230V/380V initially enters low-pass filter circuit, absorbs wave by low-pass filter circuit
After gushing signal and low-pass filtering, into rectification circuit;Specifically, AC230V or AC380V power supplys pass through low-pass filter circuit
When, surging signal is absorbed by varistor (RV1) first, then by entering rectification circuit after (L1, L2, C1, C2) low-pass filtering.
Step 2, the AC rectification of power supply after direct current, is entered high pressure letter by rectification circuit (D1, D2, D3, D4)
Number absorbing circuit;
Step 3, high-voltage signal absorbing circuit (C13) absorbs the high-voltage signal in the direct current after rectification, after obtaining conditioning
Power supply;Power supply after conditioning is divided into three branches, first branch enter voltage signal sampling circuit (R9-R12, R16,
C6, VZ2), power supply voltage signal is acquired by voltage signal sampling circuit, and collected power supply voltage signal is transferred to MCU;
Second branch enters the metal-oxide-semiconductor Q1 of trip circuit (D9, D10, L3) and driving circuit, is carried for trip circuit and metal-oxide-semiconductor Q1
Power supply source;Wherein, L3 is tripping coil, and L3 keeps attracting state with certain duty ratio voltage when voltage is normal, occurs owing
L3, which stops hold mode, when pressure causes breaker of plastic casing to disconnect, and D9 and D10 are absorbing the interference signal of L3 hold modes generation;
Third branch enters bleeder circuit (R7, R8, C3, TVS1, R1, R2, R3, R4, R5, R6, VZ1, T1), wherein
(R1, R2, R3, R4, R5, R6, VZ1 and T1) be used for control divide after regulator circuit input power voltage, transient diode
TVS1 is for absorbing regulator circuit input power high-voltage signal;After dividing and absorbing input power high-voltage signal, a branch
Regulator circuit is entered, another branch enters in driving circuit (R13, R14, R15, U1, Q1, C8, C9), is driving circuit
Power supply is provided;
Step 4, after regulator circuit (C4, U3, C11, C12) carries out voltage stabilizing to power supply, MCU is entered, and then supply to MCU
Electricity;Wherein C4 is input terminal electric capacity of voltage regulation, and C11, C12 are output end electric capacity of voltage regulation;
Step 5, for MCU (U2), the collected power supply voltage signal of voltage signal sampling circuit is handled, is sentenced
Whether disconnected power supply voltage signal is normal, if normally, thening follow the steps 6;If abnormal, show to occur under-voltage or over-pressed existing
As executing step 7;
Step 6, MCU exports the drive signal of certain duty ratio according to the size of power supply voltage signal, the drive signal
Duty ratio increases continuous reduction with power supply voltage signal, which exports to driving circuit, conducting to metal-oxide-semiconductor Q1 and
It is controlled by state, and then tripping coil L3 attracting states is kept with certain duty ratio voltage and maintain tripping coil L3
Operating voltage be steady state value, concrete mode is:
Drive signal is replaced with certain duty ratio between high level and low level;When drive signal is high level,
Metal-oxide-semiconductor Q1 conductings, tripping coil L3 are powered and keep attracting state;When drive signal is low level, metal-oxide-semiconductor Q1 cut-offs take off
The fastening wire circle L3 short time powers off, and when tripping coil L3 does not thread off, drive signal switchs to high level again, and tripping coil L3 is made to keep
Thus attracting state makes tripping coil L3 keep attracting state;Also, since the duty ratio of drive signal is with power supply voltage signal
Increase continuous reduction, therefore, when power supply voltage signal increases, in a time cycle, high level lasting time tails off,
Low duration becomes larger, and therefore, tripping coil L3 conduction times tail off, and power-off time becomes larger, in a time cycle,
The average value of tripping coil L3 terminal voltages maintains steady state value;
Wherein, in tripping coil L3 course of normal operation, the 9th rectifier diode D9 and the 10th rectifier diode D10 inhale
Receive the interference signal that tripping coil L3 hold modes generate.
Step 7, MCU controls metal-oxide-semiconductor Q1 and is continuously cut-off state, and the tripping coil L3 of trip circuit is electric and stops keeping shape
State, therefore, tripping coil L3 actions, and then breaker of plastic casing is made to disconnect.
It can be seen that a kind of breaker of plastic casing undervoltage tripping device provided by the invention, has the following advantages:
(1) duty ratio of driving circuit output voltage changes according to the variation of supply voltage, voltage more high duty ratio more
Small, voltage more low duty ratio is bigger, thus the effective voltage at tripping coil both ends can be made to maintain one in voltage change
The working condition of balance reduces trip line coil temperature rise caused by overtension, reduces tripping coil caused by brownout
Failure.
(2) low-pass filter circuit forms EMI filter circuit using two common mode inductances and safety capacitance, can effectively press down
Tripping coil processed increases the assimilation effect to surge to the conduction interference of external power supply;
(3) due to controlling driving circuit state by MCU, this undervoltage tripping device not only can be real when under-voltage
Existing tripping function can also realize over-pressed tripping function in certain overvoltage region.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
Depending on protection scope of the present invention.
Claims (5)
1. a kind of breaker of plastic casing undervoltage tripping device, which is characterized in that including:Low-pass filter circuit, rectification circuit, high pressure letter
Number absorbing circuit, voltage signal sampling circuit, trip circuit, bleeder circuit, regulator circuit, MCU and driving circuit;
The input terminal of the low-pass filter circuit is connect with external power supply, and the output end of the low-pass filter circuit is connected to described
The input terminal of rectification circuit, the output end of the rectification circuit are connected to the input terminal of the high-voltage signal absorbing circuit;It is described
The output end of high-voltage signal absorbing circuit is divided into three branches, and first branch is connected to the defeated of the voltage signal sampling circuit
Enter end, the output end of the voltage signal sampling circuit is connected to the sampling end of the MCU;Second branch is connected to described de-
The input terminal of circuit is detained, the output end of trip circuit is connected to driving circuit;Third branch is connected to the bleeder circuit
Input terminal, the 1st output end of the bleeder circuit are connected to the input terminal of the regulator circuit;The output end of the regulator circuit
It is connected to the feeder ear of the MCU;2nd output end of the bleeder circuit is connected to the feeder ear of driving circuit;The MCU's
Control terminal is connected to the control terminal of the driving circuit, and tripping coil in the trip circuit is controlled by the driving circuit
State.
2. breaker of plastic casing undervoltage tripping device according to claim 1, which is characterized in that the low-pass filter circuit packet
Include varistor (RV1), the 1st capacitance (C1), the 1st inductance (L1) and the 2nd inductance (L2);It is negative in positive pole leading-out terminal and power supply
After being installed in parallel varistor (RV1) and the 1st capacitance (C1) between the leading-out terminal of pole successively, in positive pole leading-out terminal series connection the 1st
Inductance (L1) forms low-pass filter circuit in power cathode leading-out terminal the 2nd inductance (L2) of series connection.
3. breaker of plastic casing undervoltage tripping device according to claim 2, which is characterized in that the high-voltage signal absorbs electricity
Road includes the 13rd capacitance (C13), the 13rd capacitance (C13) be connected in parallel on positive pole leading-out terminal and power cathode leading-out terminal it
Between, and connect with the output end of the rectification circuit.
4. breaker of plastic casing undervoltage tripping device according to claim 1, which is characterized in that the driving circuit includes the
13 resistance (R13), the 14th resistance (R14), the 15th resistance (R15), driving chip (U1), the 8th capacitance (C8), the 9th capacitance (C9)
With metal-oxide-semiconductor (Q1);
The trip circuit includes the 9th rectifier diode (D9), the 10th rectifier diode (D10) and tripping coil (L3);
Wherein, the input pin of the driving chip (U1) is connect with the output end of the MCU, in the driving chip (U1)
13rd resistance (13) is installed between input pin and grounding pin;The energization pins of the driving chip (U1) are electric to partial pressure
In the supply line of road output, the 8th capacitance (C8) being connected in parallel and the 9th capacitance (C9), the 8th capacitance are installed
(C8) and the 9th capacitance (C9) forms electric capacity of voltage regulation;The 1st output pin series connection the 14th electricity of the driving chip (U1)
It hinders (14), the 2nd output pin series connection the 15th resistance (15) of the driving chip (U1);14th resistance (14) it is defeated
After the output end of outlet and the 15th resistance (15) is combined into all the way, it is connected to the grid of the metal-oxide-semiconductor (Q1);The metal-oxide-semiconductor
(Q1) source electrode is connect with the power cathode leading-out terminal that bleeder circuit exports, drain electrode and the 10th rectification two of the metal-oxide-semiconductor (Q1)
The anode connection of pole pipe (D10), the cathode of the 10th rectifier diode (D10) are connect with the anode of the 9th rectifier diode (D9), the
The cathode of 9 rectifier diodes (D9) is connect with positive pole leading-out terminal;Also, the tripping coil (L3) and concatenated described the
9 rectifier diodes (D9) and the 10th rectifier diode (D10) are in parallel, pass through the 9th rectifier diode (D9) and the 10th rectification
Diode (D10) absorbs the interference signal that tripping coil (L3) hold mode generates.
5. a kind of undervoltage tripping method of claim 1-4 any one of them breaker of plastic casing undervoltage tripping device, feature
It is, includes the following steps:
Step 1, external power supply AC230V/380V initially enters low-pass filter circuit, absorbs surge letter by low-pass filter circuit
Number and low-pass filtering after, into rectification circuit;
Step 2, the AC rectification of power supply after direct current, is entered high-voltage signal absorbing circuit by rectification circuit;
Step 3, high-voltage signal absorbing circuit absorbs the high-voltage signal in the direct current after rectification, the power supply after being improved;It adjusts
Power supply after reason is divided into three branches, and first branch enters voltage signal sampling circuit, adopted by voltage signal sampling circuit
Collect power supply voltage signal, and collected power supply voltage signal is transferred to MCU;Second branch enters trip circuit and drive
The metal-oxide-semiconductor (Q1) of dynamic circuit is that trip circuit and metal-oxide-semiconductor (Q1) provide power supply;Third branch enters bleeder circuit, through dividing
After pressure and absorption input power high-voltage signal, a branch enters regulator circuit, another branch enters in driving circuit,
Power supply is provided for driving circuit;
Step 4, after regulator circuit carries out voltage stabilizing to power supply, MCU is entered, and then power to MCU;
Step 5, for MCU, the collected power supply voltage signal of voltage signal sampling circuit is handled, judges power supply electricity
Press signal whether normal, if normally, thening follow the steps 6;If abnormal, show under-voltage or over-pressed phenomenon occur, executes
Step 7;
Step 6, MCU exports the drive signal of certain duty ratio, the duty of the drive signal according to the size of power supply voltage signal
Than increasing continuous reduction with power supply voltage signal, which exports to driving circuit, conducting to metal-oxide-semiconductor (Q1) and cuts
It is controlled to state, and then tripping coil (L3) attracting state is kept with certain duty ratio voltage and maintains tripping coil
(L3) operating voltage is steady state value, and concrete mode is:
Drive signal is replaced with certain duty ratio between high level and low level;When drive signal is high level, metal-oxide-semiconductor
(Q1) it is connected, tripping coil (L3) is powered and keeps attracting state;When drive signal is low level, metal-oxide-semiconductor (Q1) cut-off takes off
Fastening wire circle (L3) short time powers off, and when tripping coil (L3) is not threaded off, drive signal switchs to high level again, makes tripping coil
(L3) attracting state is kept, tripping coil (L3) is thus made to keep attracting state;Also, since the duty ratio of drive signal is with electricity
Source voltage signal increases continuous reduction, and therefore, when power supply voltage signal increases, in a time cycle, high level is held
The continuous time tails off, and low duration becomes larger, and therefore, tripping coil (L3) conduction time tails off, and power-off time becomes larger, one
In a time cycle, the average value of tripping coil (L3) terminal voltage maintains steady state value;
Wherein, in tripping coil (L3) course of normal operation, the 9th rectifier diode (D9) and the 10th rectifier diode (D10)
Absorb the interference signal that tripping coil (L3) hold mode generates.
Step 7, MCU controls metal-oxide-semiconductor (Q1) and is continuously cut-off state, and the tripping coil (L3) of trip circuit is electric and stops keeping shape
State, therefore, tripping coil (L3) action, and then breaker of plastic casing is made to disconnect.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810756507.8A CN108695830B (en) | 2018-07-11 | 2018-07-11 | Under-voltage tripping device and under-voltage tripping method for molded case circuit breaker |
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| CN201810756507.8A CN108695830B (en) | 2018-07-11 | 2018-07-11 | Under-voltage tripping device and under-voltage tripping method for molded case circuit breaker |
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| CN108695830B CN108695830B (en) | 2023-05-30 |
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Citations (4)
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|---|---|---|---|---|
| US5740027A (en) * | 1996-06-28 | 1998-04-14 | Siemens Energy & Automation, Inc. | Trip device for an electric powered trip unit |
| CN203645303U (en) * | 2013-12-05 | 2014-06-11 | 江苏国星电器有限公司 | Under-voltage buckle releaser based on PWM control |
| CN204441855U (en) * | 2015-04-03 | 2015-07-01 | 浙江科能达电气有限公司 | A kind of under voltage trip gear |
| CN106301029A (en) * | 2016-10-25 | 2017-01-04 | 广东工业大学 | A kind of switch power supply line structure |
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2018
- 2018-07-11 CN CN201810756507.8A patent/CN108695830B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5740027A (en) * | 1996-06-28 | 1998-04-14 | Siemens Energy & Automation, Inc. | Trip device for an electric powered trip unit |
| CN203645303U (en) * | 2013-12-05 | 2014-06-11 | 江苏国星电器有限公司 | Under-voltage buckle releaser based on PWM control |
| CN204441855U (en) * | 2015-04-03 | 2015-07-01 | 浙江科能达电气有限公司 | A kind of under voltage trip gear |
| CN106301029A (en) * | 2016-10-25 | 2017-01-04 | 广东工业大学 | A kind of switch power supply line structure |
Non-Patent Citations (1)
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| 吴志祥;吴惠娟;方晓毅;蒋文贤;: "基于PWM技术的欠电压脱扣器研究与设计", 电气应用 * |
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| CN108695830B (en) | 2023-05-30 |
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