CN108933433A - The high voltage protection device of circuit system - Google Patents
The high voltage protection device of circuit system Download PDFInfo
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- CN108933433A CN108933433A CN201710381300.2A CN201710381300A CN108933433A CN 108933433 A CN108933433 A CN 108933433A CN 201710381300 A CN201710381300 A CN 201710381300A CN 108933433 A CN108933433 A CN 108933433A
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- 239000003990 capacitor Substances 0.000 claims abstract description 54
- 238000001514 detection method Methods 0.000 claims abstract description 51
- 230000005611 electricity Effects 0.000 claims description 17
- 238000005192 partition Methods 0.000 claims description 7
- 238000002955 isolation Methods 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 22
- 238000005516 engineering process Methods 0.000 description 10
- 230000007123 defense Effects 0.000 description 8
- 238000001914 filtration Methods 0.000 description 6
- 230000007774 longterm Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- 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
- H02H7/1252—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 overvoltage in input or output, e.g. by load dump
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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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
Abstract
The present invention provides a kind of high voltage protection devices of circuit system；Wherein, which includes: latching circuit unit, capacitor over-voltage detection circuit unit, timing control circuit unit, logical operation circuit unit；Wherein, latching circuit unit, for the AC input cell in circuit system three-phase is in fall zero time be more than that the input voltage of predetermined time or AC input cell is more than the first predetermined voltage when, generate the first signal, wherein, the first signal is disconnected for the main relay of control circuit system；Timing control circuit unit, for generating second signal under the triggering of the first signal；Capacitor over-voltage detection circuit unit, for generating detection signal, wherein whether detection signal is used to indicate the capacitance voltage of circuit system more than the second predetermined voltage；Logical operation circuit unit obtains third signal for carrying out logical operation to second signal and detection signal；Wherein, third signal, the disconnection and closure of the auxiliary relay for control circuit system.
Description
Technical field
The present invention relates to circuit fields, in particular to a kind of high voltage protection device of circuit system.
Background technique
With the rapid development of modern industry, the requirement for electric supply system is increasingly increased.According to various applications
Actual needs, power supply usually constitute the system of various capacity to load supplying, and such as in communication power supply, exchange input passes through friendship
Perhaps air switch is directly hung on AC network when exchange input is chronically at input high pressure or three-phase falls zero stream contactor
When line, although overvoltage protection does not have power output to power supply at this time, its input circuit is still without being detached from power grid, if power supply
Or system takes no action to, and will damage the electrolytic capacitor (usually 450V/470uF) that filtering is exported behind rectifier bridge, thus
It causes capacitor to burst, or even causes power supply on fire, phenomenon of the failure is severe, causes the interruption of communication system.
Due to cost and technical problem, most power-supply systems do not have safeguard measure to input high pressure, and Fig. 1 is in the related technology
Input voltage does not have the schematic diagram of the BOOST circuit of safeguard procedures, as shown in Figure 1, the BOOST circuit be power factor compared with
Positive BOOST circuit, Q1 are switching tube, and D1 is booster diode, and C1 is BUS capacitor, when high input voltage or three-phase fall zero curve
When, input is not turned off with output, and BUS capacitance voltage is very high, easily damages or reduce service life.
Power protection measure in the related technology has following two:
System protection, it may be assumed that when detecting that zero curve is fallen in exchange input over-voltage or exchange input three-phase, utilize the friendship of system
It flows contactor and disconnects exchange input, achieve the purpose that protection power source.The shortcomings that high voltage protection of this system level are as follows: need first
Increase a set of and permanently connected control circuit of power grid, itself there is the relevant issues such as high voltage protection and reliability,
It is required that design margin is larger, cost is very high.
Power supply itself is protected, and digital high voltage defense controls and simulated high-pressure defense controls are broadly divided into.
Digital high voltage defense controls: Fig. 2 is the circuit diagram of digital high voltage defense controls main circuit in the related technology,
Fig. 3 is the logic diagram of digital high voltage defense controls in the related technology, as shown in Figure 2 and Figure 3, when digital control circuit detects
When inputting over-voltage to exchange, main relay is disconnected, while if when electric voltage over press behind rectifier circuit on electrolytic capacitor C1,
Auxiliary relay K2 is disconnected, and realizes the high voltage protection of digital control ac power input, but the control of this data is digital control due to needing
Device, the cost is relatively high, controls complex.
Traditional simulated high-pressure defense controls: when the input of exchange continuous high-pressure or the long-term three-phase of exchange input fall zero curve,
Main relay and auxiliary relay disconnect, and exchange input and current rectifying and wave filtering circuit isolation, accessory power supply VCC are put to electrolytic capacitor C1
Electricity, voltage is gradually reduced on electrolytic capacitor C1 behind rectifier bridge.When the voltage on electrolytic capacitor C1 drops to accessory power supply shutdown
After voltage, accessory power supply has a power failure, and auxiliary relay K2 is restored to initial normally off, and exchange input high pressure again goes into rectification
Filter circuit, AC power source are ceaselessly sent a telegram here, have a power failure switching, this control model has following when continuous high-pressure inputs
Several disadvantages:
When alternating voltage is very high, when BUS capacitance voltage is zero or is very low, it is attracted electricity caused by auxiliary relay moment
Stream size is determined by alternating voltage and the pressure difference of BUS capacitance voltage and the resistance value of soft start resistance；This electric current is very big, can
Can lead to the contact of auxiliary relay can not be again off, and so that high voltage protection circuit is lost protective action, in addition excessive electric current
Capacitor charging is frequently given, the reduction of capacitor service life is made.
For above-mentioned technical problem in the related technology, currently no effective solution has been proposed.
Summary of the invention
The embodiment of the invention provides a kind of high voltage protection devices of circuit system, at least to solve handing in the related technology
When the input of stream continuous high-pressure or the long-term three-phase of exchange input fall zero curve, the short problem of capacitor service life.
According to one embodiment of present invention, a kind of high voltage protection device of circuit system is provided, comprising: latching circuit
Unit, capacitor over-voltage detection circuit unit, timing control circuit unit, logical operation circuit unit；Wherein, latching circuit list
Member, being in three-phase to fall zero time for the AC input cell in circuit system is more than predetermined time or AC input cell
When input voltage is more than the first predetermined voltage, the first signal is generated, wherein the first signal is used for the main relay of control circuit system
Device disconnects；Timing control circuit unit, for generating second signal under the triggering of the first signal；Capacitor over-voltage detection circuit list
Member, for generating detection signal, wherein whether detection signal is used to indicate the capacitance voltage of circuit system more than the second predetermined electricity
Pressure；Logical operation circuit unit obtains third signal for carrying out logical operation to second signal and detection signal；Wherein,
Three signals, the disconnection and closure of the auxiliary relay for control circuit system.
Optionally, logical operation circuit unit includes: AND gate circuit, for second signal and detection signal to be carried out and patrolled
Operation is collected, third signal is obtained.
Optionally, when the state of third signal is first state, auxiliary relay is disconnected；It is in the state of third signal
When the second state, auxiliary relay closure；Wherein, when first state is low level, the second state is high level；In the first shape
When state is high level, the second state is low level.
Optionally, second signal is square-wave signal；Wherein, when the state for detecting signal is high level, in square-wave signal
Between high period, auxiliary relay closure, capacitor charging of the AC input cell to circuit system；In the shape of detection signal
When state is high level, between square-wave signal be in low period, auxiliary relay disconnection, AC input cell and circuit system
The accessory power supply of current rectifying and wave filtering circuit isolation, circuit system discharges to capacitor.
Optionally, device further include: exchange input over-voltage detection circuit unit is in three for detecting AC input cell
Whether the time for mutually falling zero is more than the predetermined time or whether detects the input voltage of AC input cell more than the first predetermined electricity
Pressure, and in the case where the time that three-phase falls zero curve is more than the predetermined time or input voltage is more than the first predetermined voltage, output
Fourth signal, wherein input signal of the fourth signal as latching circuit unit, triggering latching circuit unit the first letter of output
Number.
Optionally, when fourth signal is in low level state, the first signal is in low level state.
Optionally, latching circuit unit includes: partition device, wherein partition device be used for fourth signal state from
After low level becomes high level, keeping the state of the first signal is low level.
Optionally, device further include: Main relay control unit, for receiving the first of the generation of latching circuit unit
Signal, and main relay is controlled according to the first signal and is disconnected.
Optionally, device further include: Auxiliary relay control unit is generated for receiving logical operation circuit unit
Third signal, and according to third signal control auxiliary relay disconnection and closure.
Optionally, Auxiliary relay control unit includes: not circuit and resistance circuit, wherein third signal warp
After carrying out inverse by not circuit, auxiliary relay is output to by resistance circuit.
Through the invention, due to being in by the latching circuit unit in the device in the AC input cell of circuit system
The time that three-phase falls zero is more than the generated when the input voltage of predetermined time or AC input cell is more than the first predetermined voltage
One signal controls the disconnection of main relay；The second signal generated by timing control circuit unit and capacitor over-voltage detection electricity
The detection signal that road unit generates carries out the closure and disconnection that the third signal that logic cloud obtains is used to control auxiliary relay,
And then may make the alternating current source and Capacitor apart of circuit system, thus can be to avoid high input voltage when generate big dash current,
And then can solve when exchanging continuous high-pressure input or the long-term three-phase of exchange input falls zero curve, capacitor service life is short to ask
Topic, increases the reliability of system.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram that input voltage does not have the BOOST circuit of safeguard procedures in the related technology；
Fig. 2 is the circuit diagram of digital high voltage defense controls main circuit in the related technology；
Fig. 3 is the logic diagram of digital high voltage defense controls in the related technology；
Fig. 4 is the structure chart of the high voltage protection device of circuit system according to an embodiment of the present invention；
Fig. 5 is the control block diagram one for the high voltage protection circuit that preferred embodiment provides according to the present invention；
Fig. 6 is the control block diagram two for the high voltage protection circuit that preferred embodiment provides according to the present invention；
Fig. 7 is the high voltage protection circuit waveform correlation schematic diagram that preferred embodiment provides according to the present invention；
Fig. 8 is the schematic diagram for the high voltage protection circuit that preferred embodiment provides according to the present invention；
Fig. 9 is the exchange input over-voltage detection circuit that preferred embodiment provides according to the present invention；
Figure 10 is the BUS capacitor over-voltage detection circuit that preferred embodiment provides according to the present invention；
Figure 11 is the schematic diagram for the timer block generation circuit that preferred embodiment provides according to the present invention；
Figure 12 is the schematic diagram for the timer block starting control circuit that preferred embodiment provides according to the present invention；
Figure 13 is the schematic diagram for the Auxiliary relay control that preferred embodiment provides according to the present invention；
Figure 14 is the schematic diagram for the Main relay control that preferred embodiment provides according to the present invention.
Specific embodiment
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and in combination with Examples.It should be noted that not conflicting
In the case of, the features in the embodiments and the embodiments of the present application can be combined with each other.
It should be noted that description and claims of this specification and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.
Embodiment 1
A kind of high voltage protection device of circuit system is provided in the present embodiment, and Fig. 4 is according to an embodiment of the present invention
The structure chart of the high voltage protection device of circuit system, as shown in figure 4, the device includes: latching circuit unit 42, timing controlled electricity
Road unit 44, capacitor over-voltage detection circuit unit 46, logical operation circuit unit 48；Wherein,
Latching circuit unit 42, it is more than predetermined for being in three-phase to fall zero time for the AC input cell in circuit system
When the input voltage of time or AC input cell is more than the first predetermined voltage, the first signal is generated, wherein the first signal is used for
The main relay of control circuit system disconnects；
Timing control circuit unit 44, for generating second signal under the triggering of the first signal；
Capacitor over-voltage detection circuit unit 46, for generating detection signal, wherein detection signal is used to indicate circuit system
Capacitance voltage whether more than the second predetermined voltage；
Logical operation circuit unit 48 obtains third signal for carrying out logical operation to second signal and detection signal；
Wherein, third signal, the disconnection and closure of the auxiliary relay for control circuit system.
By above-mentioned apparatus, due to passing through the latching circuit unit in the device at the AC input cell of circuit system
It is generated when the time that three-phase falls zero being more than the first predetermined voltage more than the input voltage of predetermined time or AC input cell
First signal controls the disconnection of main relay；The second signal generated by timing control circuit unit and capacitor over-voltage detection
The detection signal that circuit unit generates carries out the third signal that logic cloud obtains and is used to control the closure of auxiliary relay and breaks
Open, and then may make the alternating current source and Capacitor apart of circuit system, thus can be to avoid high input voltage when generate big impact electricity
Stream, and then can solve when exchanging continuous high-pressure input or the long-term three-phase of exchange input falls zero curve, capacitor service life is short
Problem increases the reliability of system.
It should be noted that the three-phase electricity of input is generally used three-phase five-wire mode, i.e. L1 L2 L3, middle line (zero curve),
Five lines of ground wire.To which L1 is connected with zero curve in this connection, phase voltage 220V, but in actual installation application process, zero curve
May fall, reform into L1 line voltage between L2, line voltage 380V.Such case needs to make safeguard measure, therefore
Zero curve in this three-phase five-wire mode is fallen, referred to as three-phase falls zero.
It should be noted that above-mentioned apparatus is compared in the related technology digital control, without complicated digitial controller,
It is at low cost, it is highly reliable.
In one embodiment of the invention, above-mentioned logical operation circuit unit includes: AND gate circuit, for believing second
Number and detection signal carry out and logical operation, obtain third signal.
It should be noted that auxiliary relay disconnects when the state of third signal is first state；In third signal
When state is the second state, auxiliary relay closure；Wherein, when first state is low level, the second state is high level；?
When first state is high level, the second state is low level.
In one embodiment of the invention, above-mentioned second signal is square-wave signal；Wherein, it is in the state of detection signal
When high level, between square-wave signal is in high period, auxiliary relay closure, capacitor of the AC input cell to circuit system
Charging；When the state for detecting signal is high level, between square-wave signal is in low period, auxiliary relay is disconnected, exchange
Input unit and the isolation of the current rectifying and wave filtering circuit of circuit system, the accessory power supply of circuit system discharge to capacitor.Can thus it lead to
The size of the high level lasting time and the low level duration that rationally adjust square-wave signal is crossed, and then auxiliary can be effectively reduced
When relay is closed, the size of dash current caused by high input voltage, and then further avoid auxiliary relay damage and capacitor
The reduction of service life increases the reliability of system.
In one embodiment of the invention, above-mentioned apparatus further include: exchange input over-voltage detection circuit unit, and it is above-mentioned
Latching circuit unit 42 connect, for detect AC input cell be in three-phase fall zero time whether be more than the predetermined time or
The input voltage of AC input cell is detected whether more than the first predetermined voltage, and falls the time of zero curve more than predetermined in three-phase
In the case that time or input voltage are more than the first predetermined voltage, fourth signal is exported, wherein fourth signal is as latching circuit
The input signal of unit 42, triggering latching circuit unit 42 export the first signal.
It should be noted that above-mentioned first signal is also located in the case where above-mentioned fourth signal is in low level state
In low level state, for example when occurring to exchange input over-voltage, above-mentioned fourth signal is in low level, then above-mentioned first letter
It number is pulled low as low level.
In one embodiment of the invention, above-mentioned latching circuit unit 42 can also include: partition device, wherein on
It states partition device to be used for after the state of fourth signal becomes high level from low level, keeping the state of the first signal is low electricity
It is flat.As soon as above-mentioned first signal is low level, and above-mentioned main relay breaks always after time low level occurs in i.e. above-mentioned fourth signal
It opens.
In one embodiment of the invention, above-mentioned apparatus can also include: Main relay control unit, for connecing
The first signal that latching circuit unit 42 generates is received, and main relay is controlled according to the first signal and is disconnected.
In one embodiment of the invention, above-mentioned apparatus can also include: Auxiliary relay control unit, be used for
The third signal that logical operation circuit unit 48 generates is received, and controls the disconnected open and close of auxiliary relay according to third signal
It closes.
It should be noted that above-mentioned Auxiliary relay control unit may include: not circuit and resistance circuit,
In, after third signal carries out inverse via not circuit, auxiliary relay is output to by resistance circuit.
For a better understanding of the present invention, below in conjunction with preferred embodiment, the present invention will be further described.
The preferred embodiment of the present invention provides in a kind of field of power electronics AC power source input high voltage protection circuit (quite
In above-mentioned high voltage protection device).The circuit mainly (is equivalent to exchange input over-voltage detection electricity by exchange input over-voltage detection circuit
Road unit), BUS capacitor over-voltage detection circuit (is equivalent to above-mentioned capacitor over-voltage detection circuit unit 46), and latching circuit (is equivalent to
Above-mentioned latching circuit unit 42), Main relay control (is equivalent to Main relay control unit), auxiliary relay control
Circuit (being equivalent to Auxiliary relay control unit) processed, timer and its control circuit (are equivalent to above-mentioned timing controlled electricity
Road unit 44) composition；By latching circuit, main relay is disconnected as long as occurring exchanging input over-voltage, while timer produces
Raw square wave, square wave and BUS capacitance voltage over-voltage detection signal make the control signal of logical "and" generation for controlling auxiliary relay
The closure and shutdown of device, make alternating current source and BUS Capacitor apart.Preferred embodiment of the present invention effective solution exchange continuous high-pressure
Input or exchange input long-term three-phase when falling zero curve, and capacitance damage and service life are short and be attracted moment in auxiliary relay
Damage auxiliary relay when leading to the problem of high current.
Being designed to provide of the preferred embodiment of the present invention solves a kind of exchange continuous high-pressure input or exchange input length
When phase three-phase falls zero curve, capacitance damage and service life it is short and auxiliary relay be attracted moment generate high current when make to assist
The high voltage protection circuit of relay damaged problem, Fig. 5 are the controls for the high voltage protection circuit that preferred embodiment provides according to the present invention
Block diagram one processed, as shown in figure 5, the high voltage protection circuit is mainly made of following components: exchange input over-voltage detection circuit,
BUS capacitor over-voltage detection circuit, latching circuit, timer and control circuit, main relay and Auxiliary relay control；When
When the input of AC power source continuous high-pressure or the long-term three-phase of exchange input fall zero curve, exchange input over-voltage detection circuit movement is main
The contact relay K1 disconnects, while timer fires timing, and generating a high level lasting time is T1, the low level duration
For the square wave of T2；The square-wave signal and the over-voltage of BUS capacitor detect signal logic "AND", if there is BUS electric voltage over press, then BUS
It is low level that capacitor over-voltage, which detects signal c, otherwise is high level.If signal c is high level, during square wave high level T1,
Auxiliary relay K2 contact closure, exchange input to electrolytic capacitor C1 charging.During square wave low level T2, auxiliary relay K2
Contact disconnects, and exchange input and current rectifying and wave filtering circuit isolation, accessory power supply VCC discharge to electrolytic capacitor C1, electricity behind rectifier bridge
Voltage is gradually reduced on solution capacitor C1；If signal c is low level, regardless of what kind of square-wave signal is, auxiliary relay is always
It disconnects.
The preferred embodiment of the present invention is compared with the prior art: with digital control comparison: without complicated digitial controller, at
This low, high reliablity.Control and compare with traditional analog: auxiliary relay time closing shutdown switches, and prevents capacitance voltage too low,
When high input voltage, big dash current is generated, the reduction of auxiliary relay damage and capacitor service life is avoided, increases and be
The reliability of system.
Fig. 6 is the control block diagram two for the high voltage protection circuit that preferred embodiment provides according to the present invention, and Fig. 7 is according to this hair
The high voltage protection circuit waveform correlation schematic diagram that bright preferred embodiment provides, as shown in Figure 6 and Figure 7, wherein Fig. 6 is BOOST function
Rate factor emphasizer circuit, Q1 are switching tube, and D1 is booster diode, and C1 is BUS capacitor；When exchange inputs over-voltage detection operation
When, high voltage protection control circuit movement, b signal rapidly goes to low potential, and main relay disconnects；Become low level in b signal
Meanwhile timer generates a square-wave signal, high level time T1, low level time is T2 as shown in fig. 7, if BUS is electric
Holding over-voltage detection signal c is low level, and auxiliary relay disconnects, BUS voltage drop, if BUS capacitor over-voltage detection signal c is
Become high level, during square wave high level T1, auxiliary relay K2 contact closure, exchange inputs to electrolytic capacitor C1 charging.
During square wave low level T2, the contact auxiliary relay K2 is disconnected, exchange input and current rectifying and wave filtering circuit isolation, accessory power supply
VCC discharges to electrolytic capacitor C1, and voltage is gradually reduced on electrolytic capacitor C1 behind rectifier bridge；It is reasonable to adjust the big of T1 and T2
Small, when can effectively reduce auxiliary relay closure, the size of dash current caused by high input voltage avoids auxiliary relay
The reduction of damage and capacitor service life, increases the reliability of system.Due to the effect of interlock circuit, as long as detecting primary
Exchange input is excessively high, and main relay just disconnects always, while auxiliary relay enters the state for not stopping to disconnect with closure switching.
Fig. 8 is the schematic diagram for the high voltage protection circuit that preferred embodiment provides according to the present invention, as shown in figure 8, self-locking electricity
Road working principle is as follows:
When exchange inputs high pressure, the movement of high voltage protection control circuit, a signal is low level, and b signal passes through diode
VD14 is dragged down by a signal rapidly, and when b signal is pulled low, main relay is disconnected, this diode main function is: working as hair
When raw exchange input over-voltage, b signal, which is pulled into low potential, rapidly disconnects relay.When a signal is low level, diode VD2
Conducting, after VD2 conducting, VT7 shutdown；When VT7 shutdown, the current collection of VT7 extremely high potential, diode VD13 conducting, power supply VCC
Base current is provided to VT9 by R9, VT9 conducting, VT9 current collection extremely low potential, power supply VCC pass through R17, VT9 to VT8 at this time
Base current, VT8 conducting are provided；After VT8 conducting, the collector current of VT8 provides base current, while the collection of VT9 for VT9
Electrode current provides base current for VT8, therefore, even if VD13 does not turn on i.e. a signal and becomes high potential, VT8, VT9 meeting at this time
Constantly on, when power supply VCC power down, VT8, VT9 can just be turned off, as long as so that reaching a signal primary low electricity occurs
B signal is just drawn as low level, disconnects main relay always by position；If it is low electricity that BUS capacitor over-voltage at this time, which detects signal c,
Flat, then auxiliary relay disconnects.If it is high level, the open and close of auxiliary relay that BUS capacitor over-voltage, which detects signal c,
It is controlled by square wave.
When a signal is high potential, since the partition of diode VD2 and VD14 act on, the state of b signal is not influenced.
Fig. 9 is the exchange input over-voltage detection circuit that preferred embodiment provides according to the present invention, as shown in figure 9, the exchange
Inputting over-voltage detection circuit includes a rectifier and first comparator, and the first comparator is by the output signal of rectifier and the
One reference signal is compared, output signal a.
Figure 10 is the BUS capacitor over-voltage detection circuit that preferred embodiment provides according to the present invention, as shown in Figure 10, the BUS
Capacitor over-voltage detection circuit includes: BUS capacitance voltage module and the second comparator, wherein the second comparator is by BUS capacitance voltage
The signal of module output is compared with the second reference signal, output signal c.
Figure 11 is the schematic diagram for the timer block generation circuit that preferred embodiment provides according to the present invention, such as Figure 11 institute
Show, which is made of some capacitors, resistance and not circuit, and but it is not limited to this.
Figure 12 is the schematic diagram for the timer block starting control circuit that preferred embodiment provides according to the present invention, such as Figure 12
Shown, which includes: AND gate circuit, for by BUS capacitance voltage over-voltage detect signal and timer block signal into
Capable and logical operation obtains auxiliary relay control signal.
It should be noted that timer block starting control circuit is equivalent to above-mentioned logical operation circuit unit 48.
Figure 13 is the schematic diagram for the Auxiliary relay control that preferred embodiment provides according to the present invention, such as Figure 13 institute
Show, which includes: not circuit, transistor circuit, resistance circuit；Wherein, the auxiliary relay control
Signal processed obtains a signal after not circuit and is input to after the signal is handled via transistor circuit and resistance circuit
Auxiliary relay, and then can control the disconnection and closure of auxiliary relay.
Figure 14 is the schematic diagram for the Main relay control that preferred embodiment provides according to the present invention, as shown in figure 14,
The Main relay control includes: transistor circuit and resistance circuit；The main relay controls signal and passes through transistor circuit
After resistance circuit processing, it is input to main relay, and then can control the disconnection and closure of main relay.
The high voltage protection circuit that the preferred embodiment of the present invention provides effectively overcomes exchange input existing in the prior art high
Electrolytic capacitor damages when pressure, service life is short and damages auxiliary relay when auxiliary relay is attracted moment generation high current
Bad problem.Have many advantages, such as that control is simple, at low cost, substantially increases the reliability of AC power source.
Obviously, those skilled in the art should be understood that each module of the above invention or each step can be with general
Computing device realize that they can be concentrated on a single computing device, or be distributed in multiple computing devices and formed
Network on, optionally, they can be realized with the program code that computing device can perform, it is thus possible to which they are stored
It is performed by computing device in the storage device, and in some cases, it can be to be different from shown in sequence execution herein
Out or description the step of, perhaps they are fabricated to each integrated circuit modules or by them multiple modules or
Step is fabricated to single integrated circuit module to realize.In this way, the present invention is not limited to any specific hardware and softwares to combine.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.It is all within principle of the invention, it is made it is any modification, etc.
With replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of high voltage protection device of circuit system characterized by comprising latching circuit unit, capacitor over-voltage detection electricity
Road unit, timing control circuit unit, logical operation circuit unit；Wherein,
The latching circuit unit, being in three-phase to fall zero time for the AC input cell in circuit system is more than pre- timing
Between or the AC input cell input voltage be more than the first predetermined voltage when, generate the first signal, wherein it is described first letter
Number for control the circuit system main relay disconnect；
The timing control circuit unit, for generating second signal under the triggering of first signal；
The capacitor over-voltage detection circuit unit, for generating detection signal, wherein the detection signal is used to indicate the electricity
Whether the capacitance voltage of road system is more than the second predetermined voltage；
The logical operation circuit unit, for obtaining the to the second signal and detection signal progress logical operation
Three signals；Wherein, the third signal, for controlling the disconnection and closure of the auxiliary relay of the circuit system.
2. the apparatus according to claim 1, which is characterized in that the logical operation circuit unit includes: AND gate circuit, is used
In to the second signal and detection signal progress and logical operation, the third signal is obtained.
3. device according to claim 1 or 2, which is characterized in that when the state of the third signal is first state,
The auxiliary relay disconnects；When the state of the third signal is the second state, the auxiliary relay closure；Wherein,
When the first state is low level, second state is high level；When the first state is high level, described the
Two-state is low level.
4. the apparatus according to claim 1, which is characterized in that the second signal is square-wave signal；Wherein, in the inspection
When the state for surveying signal is high level, between the square-wave signal is in high period, the auxiliary relay closure, the friendship
Input unit is flowed to the capacitor charging of the circuit system；When the state of the detection signal is high level, in the square wave
Signal is between low period, and the auxiliary relay disconnects, the rectification filter of the AC input cell and the circuit system
The accessory power supply of wave circuit isolation, the circuit system discharges to the capacitor.
5. the apparatus according to claim 1, which is characterized in that described device further include:
Exchange input over-voltage detection circuit unit is in three-phase for detecting the AC input cell and falls whether zero time surpasses
Whether the input voltage for spending the predetermined time or the detection AC input cell is more than first predetermined voltage, and
In the time that the three-phase falls zero curve be more than the predetermined time or the input voltage is more than the feelings of first predetermined voltage
Under condition, fourth signal is exported, wherein input signal of the fourth signal as the latching circuit unit, triggering are described certainly
Lock circuit unit exports first signal.
6. device according to claim 5, which is characterized in that described when the fourth signal is in low level state
First signal is in low level state.
7. device according to claim 6, which is characterized in that the latching circuit unit includes: partition device, wherein
The partition device is used for after the state of the fourth signal becomes high level from low level, keeps the shape of first signal
State is low level.
8. the apparatus according to claim 1, which is characterized in that described device further include:
Main relay control unit, first signal generated for receiving the latching circuit unit, and according to
First signal controls the main relay and disconnects.
9. the apparatus according to claim 1, which is characterized in that described device further include:
Auxiliary relay control unit, the third signal generated for receiving the logical operation circuit unit, with
And the disconnection and closure of the auxiliary relay are controlled according to the third signal.
10. device according to claim 9, which is characterized in that the Auxiliary relay control unit includes: NOT gate
Circuit and resistance circuit, wherein defeated by the resistance circuit after the third signal carries out inverse via the not circuit
The auxiliary relay is arrived out.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710381300.2A CN108933433A (en) | 2017-05-25 | 2017-05-25 | The high voltage protection device of circuit system |
| PCT/CN2018/088380 WO2018214954A1 (en) | 2017-05-25 | 2018-05-25 | High-voltage protection apparatus for circuit system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710381300.2A CN108933433A (en) | 2017-05-25 | 2017-05-25 | The high voltage protection device of circuit system |
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| Publication Number | Publication Date |
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| CN108933433A true CN108933433A (en) | 2018-12-04 |
Family
ID=64396256
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710381300.2A Pending CN108933433A (en) | 2017-05-25 | 2017-05-25 | The high voltage protection device of circuit system |
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|---|---|
| CN (1) | CN108933433A (en) |
| WO (1) | WO2018214954A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110518563A (en) * | 2019-09-11 | 2019-11-29 | 广东志高暖通设备股份有限公司 | The method and its MCU of overvoltage protection, air-conditioning equipment |
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| EP2466319A1 (en) * | 2010-12-14 | 2012-06-20 | General Electric Company | Capacitance check and voltage monitoring circuit for use with a circuit protection device |
| CN103390879A (en) * | 2012-05-10 | 2013-11-13 | 中兴通讯股份有限公司 | Alternating current power supply input high voltage protection device |
| CN104466900A (en) * | 2014-12-10 | 2015-03-25 | 英飞特电子（杭州）股份有限公司 | Input voltage overvoltage protection circuit |
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| CN100349349C (en) * | 2003-06-06 | 2007-11-14 | 中兴通讯股份有限公司 | AC inputting high-voltage protector |
| CN100477439C (en) * | 2005-01-08 | 2009-04-08 | 艾默生网络能源系统有限公司 | Switching power supply with overvoltage protection and overvoltage protection method thereof |
| US8400744B2 (en) * | 2010-05-19 | 2013-03-19 | Schneider Electric USA, Inc. | Earth leakage detection module with robust transient suppression |
| CN106356806B (en) * | 2016-11-04 | 2019-08-06 | 青岛海信网络科技股份有限公司 | A kind of protection circuit of traffic signaling equipment |
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- 2017-05-25 CN CN201710381300.2A patent/CN108933433A/en active Pending
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| US4742424A (en) * | 1987-04-28 | 1988-05-03 | General Electric Company | Power status monitor for electronic system |
| EP2466319A1 (en) * | 2010-12-14 | 2012-06-20 | General Electric Company | Capacitance check and voltage monitoring circuit for use with a circuit protection device |
| CN103390879A (en) * | 2012-05-10 | 2013-11-13 | 中兴通讯股份有限公司 | Alternating current power supply input high voltage protection device |
| CN104466900A (en) * | 2014-12-10 | 2015-03-25 | 英飞特电子（杭州）股份有限公司 | Input voltage overvoltage protection circuit |
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| CN110518563A (en) * | 2019-09-11 | 2019-11-29 | 广东志高暖通设备股份有限公司 | The method and its MCU of overvoltage protection, air-conditioning equipment |
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| Publication number | Publication date |
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| WO2018214954A1 (en) | 2018-11-29 |
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Application publication date: 20181204 |