CN108631574A - A kind of remote numerical control soft strater and its control method for AC power - Google Patents
A kind of remote numerical control soft strater and its control method for AC power Download PDFInfo
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- CN108631574A CN108631574A CN201810521022.0A CN201810521022A CN108631574A CN 108631574 A CN108631574 A CN 108631574A CN 201810521022 A CN201810521022 A CN 201810521022A CN 108631574 A CN108631574 A CN 108631574A
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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
- H02M1/36—Means for starting or stopping converters
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/081—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters wherein the phase of the control voltage is adjustable with reference to the AC source
- H02M1/082—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters wherein the phase of the control voltage is adjustable with reference to the AC source with digital control
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/083—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the ignition at the zero crossing of the voltage or the current
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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Abstract
The invention discloses a kind of remote numerical control soft straters for AC power, including zero cross detection circuit, control circuit and power switch circuit.The input terminal of zero cross detection circuit is inputted with AC power phase line and zero curve input connects, dead-center position for detecting the upper AC sine wave voltage of AC power phase line input, and the dead-center position detected is transmitted to control circuit in the form of zero passage detection pulse signal.Control circuit is connect with power switch circuit, for when external enable signal is in enabled state, start timing according to the rising edge for the zero passage detection pulse signal for coming from zero cross detection circuit, when timing reaches clocking value, silicon-controlled unbalanced pulse is exported to power switch circuit, count value is gradually reduced, and the voltage that power switch circuit exports is made to gradually rise.When clocking value is reduced to 0, control circuit persistently exports high level signal to power switch circuit, so that power switch circuit is in and continues opening state, completes soft start-up process.
Description
Technical field
The invention belongs to single-phase or three-phase alternating current source domains, more particularly, to a kind of for the long-range of AC power
Numerical control soft strater and its control method.
Background technology
Common, single-phase or three-phase alternating-current supply is accessed by power switch and is loaded, and power switch is opened moment, and injection is negative
The transient current of load is typically much deeper than steady state operating current, that is, generates surge current, and surge current can not only make the friendship in equipment
The damages such as switch, fuse, electromagnetic interface filter are flowed, interference can be also generated to electric network source, triggering power protective equipment is opened, led
Cause power-off, or the normal work of interference other equipment.In the moment of electric power starting, the surge current for loading generation is more than normal
Tens times of operating current, it is necessary to inhibition processing be carried out to the surge current, a kind of processing mode generally used at present is to use
Soft strater.Its basic principle is after power switch is opened, and the voltage that load is output to by soft strater control gradually rises,
To eliminate surge current.
It is to use resistance R, capacitance C and metal-oxide-semiconductor group that soft strater currently used for AC power, which usually has two classes, the first kind,
At soft strater, by resistance R to capacitance C chargings to adjust power on time, switch of the metal-oxide-semiconductor as power supply, by capacitance C
Voltage controlled, resistance R generally use high-power resistances, the problem of will produce heat dissipation and extra power consumption in the course of work,
In order to solve this problem, usually that resistance R is in parallel with relay, relay is closed after the completion of soft start, by resistance R short circuits；The
Two classes are connect with timing controller using resistance R and capacitance C, and the output of timing controller controls silicon-controlled switch,
Power on time is controlled by adjusting resistance R and capacitance C, and needs to realize zero passage detection using transformer and rectifier bridge.
However, there are some very important defects for above-mentioned two classes soft strater：1, this two classes soft strater was using
The parameter value of R and C can not be adjusted in journey, it is difficult to meet the needs of different loads are to different soft-start times；2, it is to meet power supply
The demand started repeatedly needs to carry out discharge treatment to capacitance C, increases circuit complexity, and power supply start repeatedly between must
There need be the stand-by period；3, this two classes soft strater can not realize the control of power supply on and off by remote input, cannot be satisfied
The requirement of power switch remote automatic control after instrument field equipment network；4, it using high power devices such as resistance R, deposits
Additional power consumption and need heat dissipation the problem of；5, there are volumes for relay, the transformer introduced greatly, restricted lifetime
The problem of；
Invention content
For the disadvantages described above or Improvement requirement of the prior art, the present invention provides a kind of long-range numbers for AC power
Soft strater and its control method are controlled, it is intended that solving to cannot be satisfied different loads pair present in existing soft strater
The demand of different soft-start times needs the stand-by period when restarting repeatedly, can not realize switch by remote input, using big work(
Rate device attracts additional power consumption and heat dissipation problem and using relay, isometric big, restricted lifetime the skill of transformer
Art problem.
To achieve the above object, according to one aspect of the present invention, a kind of remote numerical control for AC power is provided
Soft strater, including zero cross detection circuit, control circuit and power switch circuit, zero cross detection circuit is for detecting phase line
The dead-center position of AC sine wave voltage in input, and by the dead-center position detected in the form of zero passage detection pulse signal
It is transmitted to control circuit, control circuit is used for when external enable signal is in enabled state, electric according to zero passage detection is come from
The rising edge of the zero passage detection pulse signal on road starts timing, can to power switch circuit output when timing reaches clocking value
Silicon unbalanced pulse is controlled, and when clocking value is 0, persistently exports high level signal to power switch circuit, makes power switch circuit
In lasting opening state, power switch circuit is used for according to silicon-controlled unbalanced pulse or high level letter from control circuit
Number, on or off operation is carried out to the output of AC power phase line.
Preferably, zero cross detection circuit includes rectifier bridge, first resistor, the first photoelectrical coupler and second resistance, whole
The input terminal for flowing bridge is inputted with AC power phase line and zero curve input connects, and the first output end is connected to first by first resistor
The anode of photoelectrical coupler input side, second output terminal are connect with the cathode of the first photoelectrical coupler input side, the first photoelectricity coupling
First output end of clutch is connected by second resistance and direct current input, while being connected to the first input end of control circuit, the
The second output terminal of one photoelectrical coupler is grounded.
Preferably, rectifier bridge is surface-mount type rectifier bridge, and the AC sine wave voltage for directly inputting AC power phase line
Rectification is converted to full positive half cycle sine voltage, when the transformed voltage of rectifier bridge rectification is higher than the unlatching of the first photoelectrical coupler
When voltage, the outlet side of the first photoelectrical coupler is connected, and exports low level zero passage detection signal to control circuit, works as rectifier bridge
When voltage after rectification is less than the cut-in voltage of the first photoelectrical coupler, the outlet side of the first photoelectrical coupler is closed, and output is high
The zero passage detection pulse signal of level is to control circuit.
Preferably, control circuit is additionally operable to when external enable signal is in disabled state, is continued to power switch circuit
Low level signal is exported, power switch circuit is made to be in continuously off state.
Preferably, control circuit includes controller, multidigit toggle switch, 3rd resistor and the 4th resistance, controller
5th resistance of the first output end and power switch circuit connects, and the on or off for controlling power switch circuit operates, control
The second input terminal of multidigit of device is respectively with every connection of toggle switch, and for controlling soft-start time, the third of controller is defeated
Enter end to connect by one end and external interface of the 4th resistance and 3rd resistor, comes from the external interface for obtaining
External input switches signal, the other end ground connection of 3rd resistor；4th input terminal of controller is connect with telecommunications network, is used
Signal is controlled in receiving the telecommunication for coming from the telecommunications network, external enable signal is in telecommunication control signal
Enable signal and external input switches signal represented by enable signal carry out the result with operation.
Preferably, when external enable signal is in enabled state：
When control circuit received to n-th for the 1st time come from zero cross detection circuit zero passage detection pulse signal it is upper
Rise along when start timing, clocking value should be less than half week of AC sine wave voltage and silicon-controlled unbalanced pulse width
Difference, and more than or equal to half week of AC sine wave voltage and the integer after the poor rounding of silicon-controlled unbalanced pulse width
Value, wherein n are that each clocking value is continuously repeated the number used, and value is equal to multidigit toggle switch in control circuit and inputs
Decimal value corresponding to level；
When control circuit is received in (n+1)th time to the 2n times, (2n+1) to the 3n times ... mn+1 to (m+1) n times
When to the rising edge of zero passage detection pulse signal for coming from zero cross detection circuit 1, the value of clocking value is gradually successively decreased, wherein m
Indicate that clocking value is decremented to 0 total degree that successively decreases.
Preferably, when power switch circuit received from control circuit be high level signal when, power switch circuit pair
The output of AC power phase line carries out continuing opening operation, and what is received from control circuit when power switch circuit is silicon-controlled unlatching
When pulse, AC power phase line is exported in the rising edge of silicon-controlled unbalanced pulse and is opened by power switch circuit, and in alternating current
When source phase line input voltage becomes 0, AC power phase line is exported and is closed, is received from control circuit when power switch circuit
When being low level signal, power switch circuit carries out continuously off operation to the output of AC power phase line.
Preferably, power switch circuit include the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance,
Capacitance, bidirectional triode thyristor, optocoupler be silicon-controlled and triode, one end of the 6th resistance and the second plate of bidirectional triode thyristor,
One end of seven resistance and the input connection of AC power phase line, the first sun that the other end passes through capacitance connection to bidirectional triode thyristor
Pole, one end of the 8th resistance and the output of AC power phase line, the other end of the 8th resistance are connected to the control of bidirectional triode thyristor
Pole and the silicon-controlled first anode of optocoupler, the silicon-controlled second plate of optocoupler are connected to the other end of the 7th resistance, and optocoupler can
The anode of control silicon input side is connected to DC power supply by the 9th resistance, and the cathode of input side is connected to the collector of triode,
The emitter of triode is grounded, and base stage is connected to the 5th resistance.
Preferably, the remote numerical control soft strater further comprises surge protection circuit, defeated with AC power phase line
Enter connection, for absorbing the upper peak voltage that may be present of AC power phase line input, surge protection circuit includes atmospherical discharges
Pipe, the first varistor, the second varistor and third varistor, the first varistor, the second varistor and
Third varistor is connected in π types, and the one of the public connecting end and air discharge tube of the first varistor and third varistor
The public connecting end of end connection, the other end ground connection of air discharge tube, the first varistor and the second varistor is connected to friendship
The zero curve that the public connecting end of the phase line input of galvanic electricity source, the second varistor and third varistor is connected to AC power is defeated
Enter.
It is another aspect of this invention to provide that providing a kind of controlling party of the remote numerical control soft strater for AC power
Method includes the following steps：
(1) dead-center position of the upper AC sine wave voltage of zero cross detection circuit detection AC power phase line input, and will inspection
The dead-center position measured is transmitted to control circuit in the form of zero passage detection pulse signal；
(2) control circuit persistently exports low level signal to power switch circuit, so that power switch circuit is in lasting and closes
Closed state；
(3) control circuit judges that its external enable signal is enabled state or disabled state, if it is enabled state, then
(4) are entered step, if it is disabled state, then return to step (2)；
(4) decimal value corresponding to incoming level of the control circuit according to its multidigit toggle switch determines clocking value quilt
The frequency n used is continuously repeated, and the initial value of clocking value is set；
(5) control circuit starts timing according to the rising edge of zero passage detection pulse signal, when timing reaches clocking value, to
Power switch circuit exports silicon-controlled unbalanced pulse；
(6) AC power phase line is exported in the rising edge of silicon-controlled unbalanced pulse and is opened by power switch circuit；
(7) power switch circuit judges whether AC power phase line input voltage becomes 0, if yes then enter step (8),
Otherwise it enters step (9)；
(8) AC power phase line is exported and is closed by power switch circuit, and judges whether clocking value access times reach meter
Duration is continuously repeated the frequency n used, is if it is transferred to step (10), otherwise return to step (5)；
(9) power switch circuit keeps the output of AC power phase line, is then back to step (7)；
(10) control circuit updates clocking value, and judges whether updated clocking value is 0, and step is entered if equal to 0
Suddenly (11), otherwise return to step (5)；
(11) control circuit persistently exports high level signal to power switch circuit, so that power switch circuit is in and persistently beats
Open state；
(12) power switch circuit judges whether the input of AC power phase line powers off, and process terminates if power-off, otherwise
It enters step (13)；
(13) its external enable signal of monitoring control devices；
(14) controller judges whether the state of external enable signal is become disabling from enabled, if it is return to step
(2), otherwise return to step (13).
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect：
1, soft strater of the present invention is to start the time using controller control in use, without changing any element
Parameter, therefore the soft strater can meet the needs of different loads are to different soft-start times；
2, the controller that the present invention uses is stopped when power supply is closed, and is not influenced by any outer member, electricity
Source can restart immediately after closing, and without waiting for the time；
3, the present invention controls enable signal in signal by telecommunication and external input switches signals controls power supply
The on and off of switching circuit, to realize remote control；
4, the present invention is without using high power device, not additional power consumption, therefore heat dissipation problem is not present；
5, the present invention is without using the large volumes such as relay, transformer, high-power resistance, mechanical executive component, therefore energy
Enough solve the problems, such as that equipment volume existing for existing soft strater is big, restricted lifetime；
6, the bidirectional triode thyristor used in the present invention can bear 10 to 40A electric current, make the soft strater of the present invention that can make
For the load scenarios of various power, it is of wide application；
7, decimal value of the present invention corresponding to multiple toggle switch incoming levels in control circuit is by control electricity
Road repeats to open the delay time n times of bidirectional triode thyristor, and by adjusting the size of n, controllable AC power phase line input is opened
Speed is opened, the load delay startup requirement for adapting to different characteristics.
Description of the drawings
Fig. 1 is circuit block diagram of the present invention for the remote numerical control soft strater of AC power；
Fig. 2 is detailed circuit diagram of the present invention for the remote numerical control soft strater of AC power；
Fig. 3 (A) shows the AC sine wave voltage in detection phase line input；Fig. 3 (B) shows that rectifier bridge rectification is transformed
Voltage；Fig. 3 (C) shows the zero passage detection pulse signal of the first photoelectrical coupler output；
Fig. 4 (A) shows being superimposed for AC sine wave voltage and zero passage detection pulse signal；Fig. 4 (B) shows control circuit root
Clocking value, the Yi Jixiang of the different moments set by rising edge according to the zero passage detection pulse signal for coming from zero cross detection circuit
The silicon-controlled unbalanced pulse of power switch circuit output；Fig. 4 (C) shows power switch circuit according to silicon-controlled from control circuit
Unbalanced pulse, high level signal or low level signal carry out the voltage obtained after on or off operation to the output of AC power phase line
Oscillogram；
Fig. 5 shows flow chart of the present invention for the control method of the remote numerical control soft strater of AC power.
In all the appended drawings, identical reference numeral is used for indicating identical element or structure, wherein：
1- zero cross detection circuits；2- control circuits；3- power switch circuits；4- surge protection circuits.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
It does not constitute a conflict with each other and can be combined with each other.
As illustrated in fig. 1 and 2, the present invention includes zero cross detection circuit 1, control for the remote numerical control soft strater of AC power
Circuit 2, power switch circuit 3 and surge protection circuit 4 processed.
The input terminal of zero cross detection circuit 1 is inputted with AC power phase line and zero curve input connects, for detecting alternating current
The dead-center position of the upper AC sine wave voltage of source phase line input (shown in such as Fig. 3 (A)), and by the dead-center position detected with mistake
The form of zero detection pulse signal is transmitted to control circuit 2.
The frequency of the phase line input AC sine voltage of AC power is 50Hz, the zero passage detection pulse signal of output
Frequency is 100Hz, and synchronous with the zero of AC sine wave.
Zero cross detection circuit 1 includes rectifier bridge BR, first resistor R6, the first photoelectrical coupler U2 and second resistance R9.
The input terminal of rectifier bridge BR is connected with the input of AC power phase line, and the first output end is connected to by first resistor R6
The anode of first photoelectrical coupler U2 input sides, second output terminal are connect with the cathode of the first photoelectrical coupler U2 input sides, the
The first output end of one photoelectrical coupler U2 is connected by second resistance R9 and direct current input, while being connected to control circuit 2
The second output terminal of first input end IO2, the first photoelectrical coupler U2 are grounded.
Rectifier bridge BR is surface-mount type rectifier bridge, for being directly converted to the AC sine wave voltage rectification that phase line inputs
Full positive half cycle sine voltage (shown in such as Fig. 3 (B)).
The resistance value of first resistor R6 is 100K Ω or more, and the electric current for limiting the first photoelectrical coupler U2 input sides should
Resistance is small-power resistance.
The input side and outlet side of first photoelectrical coupler U2 is respectively used to realize the isolation of high voltage and low-voltage.
When the transformed voltage of rectifier bridge BR rectifications is higher than cut-in voltage (0.7V) of the first photoelectrical coupler U2, first
The outlet side of photoelectrical coupler U2 is connected, and exports low level zero passage detection signal to control circuit 2；After rectifier bridge BR rectifications
Voltage when being less than cut-in voltage (0.7V) of the first photoelectrical coupler U2, the outlet side of the first photoelectrical coupler U2 is closed, defeated
Go out the zero passage detection pulse signal of high level to control circuit 2, as shown in Fig. 3 (C).
Control circuit 2 is connect with power switch circuit 3, for being in enabled (Enabled) state in external enable signal
When, timing is started according to the rising edge for the zero passage detection pulse signal for coming from zero cross detection circuit 1, clocking value is reached in timing
When, silicon-controlled unbalanced pulse (shown in such as Fig. 4 (B)) is exported to power switch circuit 3, and when clocking value is 0, to power switch
Circuit 3 persistently exports high level signal, so that power switch circuit 3 is in and continues opening state；
Control circuit 2 is additionally operable to when external enable signal is in disability (Disabled) state, and control circuit 2 is to power supply
Switching circuit 3 persistently exports low level signal, and power switch circuit 3 is made to be in continuously off state.
Specifically, when external enable signal is in enabled state：
As shown in Fig. 4 (A) and (B), come from the mistake of zero cross detection circuit 1 when control circuit receives for the 1st time to n-th
When the rising edge of zero detection pulse signal, clocking value should be less than half week (i.e. 10 milliseconds) of AC sine wave voltage with controllably
The difference of silicon unbalanced pulse width, and half week (i.e. 10 milliseconds) more than or equal to AC sine wave voltage and silicon-controlled unlatching
Integer value after the poor rounding of pulse width, preferably better closer to the former, wherein n is continuously repeated for each clocking value to be made
Number, value are equal to the decimal value corresponding to multidigit toggle switch SW1 incoming levels in control circuit 2.For example,
If the width of silicon-controlled unbalanced pulse is 0.1 millisecond, the value range of the clocking value is between 9 to 9.9 milliseconds, can value
9.8ms, if control circuit 2 includes 3 toggle switch, and its incoming level is respectively 0,1,1, then the value of n is equal to 011 institute
Corresponding decimal value 3, and control circuit 2 exported to power switch circuit 3 silicon-controlled unbalanced pulse clocking value it is 3 times equal
For 9.8ms.
When control circuit is received in (n+1)th time to the 2n times, (2n+1) to the 3n times ... mn+1 to (m+1) n times
When to the rising edge of zero passage detection pulse signal for coming from zero cross detection circuit 1, the value of clocking value is gradually successively decreased, wherein m
Indicate that clocking value is decremented to 0 total degree that successively decreases, successively decrease can be with fixed step-length (such as every time reduce 0.1 millisecond),
Can also be that first slow rear fast mode carries out (for example, reducing 0.1 millisecond when starting, becoming to reduce 0.2 millisecond later ..., with this
Analogize).
Control circuit 2 includes controller U3, multidigit toggle switch SW1,3rd resistor R7 and the 4th resistance R8.
Controller U3 can be microcontroller (Microcontrollerunit, abbreviation MCU), programmable gate array (CPLD or
FPGA) or digital signal processor DSP, the first output end IO1 are connect with the 5th resistance R5 of power switch circuit 3, multidigit
For second input terminal IO4 to ION respectively with every connection of toggle switch SW1, third input terminal IO3 passes through the 4th resistance R8 and
One end of three resistance R7 and external interface J1 connections, for obtaining the external input switches letter for coming from external interface J1
Number, the other end ground connection of 3rd resistor R7, the 4th input terminal Com is connect with telecommunications network J2, comes from this for receiving
The telecommunication of telecommunications network J2 controls signal.Controller U3 receives the order of telecommunication control signal, and parses life
Enable enabled (Enabled) that indicates or disability (Disabled) state；The outside that controller U3 receives external interface J1 simultaneously is defeated
Enter switching signal, indicates that disability (Disabled), external input switches signal are low when external input switches signal is high level
It indicates to enable (Enabled) when level.Controller U3 controls the enabled state of signal to telecommunication and external input switches are believed
Number enabled state carry out and operation, result be exactly outside enable signal.
The input terminal of power switch circuit 3 is inputted with AC power phase line and zero curve input connects, output end and alternating current
Source phase line output connection, for silicon-controlled unbalanced pulse or high level signal of the basis from control circuit 2, to AC power phase
Line output carries out on or off operation (shown in such as Fig. 4 (C))；
Specifically, when what is received from control circuit 2 is high level signal, power switch circuit 3 is to AC power
Phase line output carries out continuing opening operation.
When what is received from control circuit 2 is silicon-controlled unbalanced pulse, power switch circuit 3 is in silicon-controlled unbalanced pulse
Rising edge AC power phase line exported open, and when AC power phase line input voltage becomes 0, by AC power phase line
Output is closed.
It is defeated to AC power phase line when what power switch circuit 3 was additionally operable to receive from control circuit 2 is low level signal
Go out to carry out continuously off operation.
Power switch circuit 3 includes the 5th resistance R5, the 6th resistance R1, the 7th resistance R2, the 8th resistance R3, the 9th resistance
R4, capacitance C1, bidirectional triode thyristor D3, optocoupler silicon-controlled U1 and triode Q1.
One end of 6th resistance R1 and the second plate of bidirectional triode thyristor D3, one end of the 7th resistance R2 and alternating current
The input connection of source phase line, the other end be connected to by capacitance C1 the first anode of bidirectional triode thyristor D3, the 8th resistance R3 one end,
And the output of AC power phase line, the other end of the 8th resistance R3 is connected to the control pole of bidirectional triode thyristor D3 and optocoupler can
The first anode of silicon U1 is controlled, the second plate of the silicon-controlled U1 of optocoupler is connected to the other end of the 7th resistance R2.The silicon-controlled U1 of optocoupler
The anode of input side is connected to DC power supply by the 9th resistance R4, and the cathode of input side is connected to the collector of triode Q1,
The emitter of triode Q1 is grounded, and base stage is connected to the 5th resistance R5.
When the base stage of triode Q1 is high level, triode Q1 and the silicon-controlled U1 conductings of optocoupler, the silicon-controlled U1 of optocoupler drive
Dynamic bidirectional triode thyristor D3 conductings, the output of AC power phase line will be inputted with AC power phase line and will be connected, and output voltage.Work as reception
To (pulse width is 10us~100us) when the silicon-controlled unbalanced pulse for coming from control circuit 2, triode Q1 and optocoupler can
The of short duration unlatchings of silicon U1 are controlled, and rising edge excitation bidirectional triode thyristor D3 conductings, bidirectional triode thyristor D3 meetings are opened in the silicon-controlled U1 of optocoupler
Lasting to open, until the phase line input voltage of AC power becomes 0V, bidirectional triode thyristor D3 is automatically closed at this time.
In the circuit, the silicon-controlled U1 low-pressure sides of optocoupler, the 6th resistance R1, triode Q1, the 5th resistance R5 are worked in
Low-voltage, power are extremely low；The silicon-controlled high-pressure sides U1 of optocoupler, the 7th resistance R2, the 8th resistance R3 work in high pressure conditions, but consume
Electric current be no more than 50mA, power very little；These elements are all using small size, low power devices.
Bidirectional triode thyristor D3 carries out the core devices of switching manipulation as being exported to the input of AC power phase line and phase line,
Opening resistor very little, the power very little of its consumption when normal work, it is only necessary to the cooling fin for installing very little, by cross-ventilation from
So heat dissipation.
Surge protection circuit 4 is connected with the input of AC power phase line, may be deposited in the input of AC power phase line for absorbing
Peak voltage (such as instant high-voltage of the generations such as lightning stroke, Electro-static Driven Comb), make the present invention remote numerical control soft strater
Has anti-lightning strike, antistatic ability.
Surge protection circuit 4 include air discharge tube D1, the first varistor ZNR1, the second varistor ZNR2 and
Third varistor ZNR3.First varistor ZNR1, the second varistor ZNR2 and third varistor ZNR3 are in π types
The public connecting end of connection, the first varistor ZNR1 and third varistor ZNR3 are connect with one end of air discharge tube D1,
The other end of air discharge tube D1 is grounded, and the public connecting end of the first varistor ZNR1 and the second varistor ZNR2 are connected to
AC power phase line inputs, and the public connecting end of the second varistor ZNR2 and third varistor ZNR3 are connected to AC power
Zero curve input.
As shown in figure 5, the present invention also provides the controlling parties of more than one remote numerical control soft straters for stating AC power
Method comprising following steps：
(1) dead-center position of the upper AC sine wave voltage of zero cross detection circuit detection AC power phase line input, and will inspection
The dead-center position measured is transmitted to control circuit in the form of zero passage detection pulse signal；
Specifically, the frequency of the phase line input AC sine voltage of AC power is 50Hz, the zero passage detection of output
The frequency of pulse signal is 100Hz, and synchronous with the zero of AC sine wave.
(2) control circuit persistently exports low level signal to power switch circuit, so that power switch circuit is in lasting and closes
Closed state；
(3) control circuit judges that its external enable signal is enabled state or disabled state, if it is enabled state, then
(4) are entered step, if it is disabled state, then return to step (2)；
Specifically, external enable signal is defeated to the enabled state of telecommunication control signal and outside by controller
The enabled state for entering switching signal obtained with after operation.
(4) decimal value corresponding to incoming level of the control circuit according to its multidigit toggle switch determines clocking value quilt
The frequency n used is continuously repeated, and the initial value of clocking value is set；
Specifically, clocking value should be less than half week (i.e. 10 milliseconds) of AC sine wave voltage and silicon-controlled unlatching arteries and veins
Rush the difference of width, and half week (i.e. 10 milliseconds) more than or equal to AC sine wave voltage and silicon-controlled unbalanced pulse width
Poor rounding after integer value, it is preferably better closer to the former.For example, if the width of silicon-controlled unbalanced pulse is 0.1 milli
Second, then the value range of the clocking value is between 9 to 9.9 milliseconds, can value 9.8ms；
For example, if control circuit includes 3 toggle switch, and its incoming level is respectively 0,1,1, then the value etc. of n
In the decimal value 3 corresponding to 011.
(5) control circuit starts timing according to the rising edge of zero passage detection pulse signal, when timing reaches clocking value, to
Power switch circuit exports silicon-controlled unbalanced pulse；
(6) AC power phase line is exported in the rising edge of silicon-controlled unbalanced pulse and is opened by power switch circuit；
(7) power switch circuit judges whether AC power phase line input voltage becomes 0, if yes then enter step (8),
Otherwise it enters step (9)；
(8) AC power phase line is exported and is closed by power switch circuit, and judges whether clocking value access times reach meter
Duration is continuously repeated the frequency n used, is if it is transferred to step (10), otherwise return to step (5)；
(9) power switch circuit keeps the output of AC power phase line, is then back to step (7)；
(10) control circuit updates clocking value, and judges whether updated clocking value is 0, and step is entered if equal to 0
Suddenly (11), otherwise return to step (5)；
Specifically, when control circuit is in (n+1)th time to the 2n times, (2n+1) to the 3n times ... mn+1 to (m+
1) when n times receive the rising edge for the zero passage detection pulse signal for coming from zero cross detection circuit, the value of clocking value is gradually passed
Subtract, wherein m indicates that clocking value is decremented to 0 total degree that successively decreases, and it can (such as be reduced every time with fixed step-length to successively decrease
0.1 millisecond), can also be that first slow rear fast mode carries out (for example, reducing 0.1 millisecond when starting, becoming to reduce by 0.2 milli later
Second ..., and so on).
(11) control circuit persistently exports high level signal to power switch circuit, so that power switch circuit is in and persistently beats
Open state；
(12) power switch circuit judges whether the input of AC power phase line powers off, and process terminates if power-off, otherwise
It enters step (13)；
(13) its external enable signal of monitoring control devices；
(14) controller judges whether the state of external enable signal is become disabling from enabled, if it is return to step
(2), otherwise return to step (13).
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all within the spirits and principles of the present invention made by all any modification, equivalent and improvement etc., should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of remote numerical control soft strater for AC power, including zero cross detection circuit, control circuit and power supply are opened
Powered-down road, which is characterized in that
Zero cross detection circuit is used to detect the dead-center position of the upper AC sine wave voltage of phase line input, and the zero that will be detected
Position is transmitted to control circuit in the form of zero passage detection pulse signal；
Control circuit is used for when external enable signal is in enabled state, according to the zero passage detection for coming from zero cross detection circuit
The rising edge of pulse signal starts timing, and when timing reaches clocking value, silicon-controlled unbalanced pulse is exported to power switch circuit,
And when clocking value is 0, high level signal is persistently exported to power switch circuit, so that power switch circuit is in and continues open shape
State；
Power switch circuit is used for according to silicon-controlled unbalanced pulse or high level signal from control circuit, to AC power phase
Line output carries out on or off operation.
2. remote numerical control soft strater according to claim 1, which is characterized in that
Zero cross detection circuit includes rectifier bridge, first resistor, the first photoelectrical coupler and second resistance；
The input terminal of rectifier bridge is inputted with AC power phase line and zero curve input connects, and the first output end is connected by first resistor
To the anode of the first photoelectrical coupler input side, second output terminal is connect with the cathode of the first photoelectrical coupler input side；
First output end of the first photoelectrical coupler is connected by second resistance and direct current input, while being connected to control circuit
First input end；
The second output terminal of first photoelectrical coupler is grounded.
3. remote numerical control soft strater according to claim 1, which is characterized in that
Rectifier bridge is surface-mount type rectifier bridge, and is directly converted to the AC sine wave voltage rectification that AC power phase line inputs entirely
Positive half cycle sine voltage；
When the transformed voltage of rectifier bridge rectification be higher than the first photoelectrical coupler cut-in voltage when, the first photoelectrical coupler it is defeated
Go out side conducting, exports low level zero passage detection signal to control circuit；
When voltage after rectifier bridge rectification is less than the cut-in voltage of the first photoelectrical coupler, the outlet side of the first photoelectrical coupler
It closes, exports the zero passage detection pulse signal of high level to control circuit.
4. remote numerical control soft strater according to claim 1, which is characterized in that control circuit is additionally operable to enabled in outside
When signal is in disabled state, low level signal is persistently exported to power switch circuit, so that power switch circuit is in lasting and closes
Closed state.
5. remote numerical control soft strater according to claim 4, which is characterized in that
Control circuit includes controller, multidigit toggle switch, 3rd resistor and the 4th resistance；
5th resistance of the first output end of controller and power switch circuit connects, for control power switch circuit open or
Close operation；
The second input terminal of multidigit of controller respectively with every connection of toggle switch, for controlling soft-start time；
The third input terminal of controller is connected by one end and external interface of the 4th resistance and 3rd resistor, for obtaining
Come from the external input switches signal of the external interface, the other end ground connection of 3rd resistor；4th input terminal of controller with
Telecommunications network connects, for receiving the telecommunication control signal for coming from the telecommunications network；
External enable signal is that the enable signal in telecommunication control signal is enabled with represented by external input switches signal
Signal carries out the result with operation.
6. remote numerical control soft strater according to claim 5, which is characterized in that
When external enable signal is in enabled state：
When the 1st rising edge for receiving the zero passage detection pulse signal for coming from zero cross detection circuit to n-th of control circuit
When start timing, clocking value should be less than the difference of half week and silicon-controlled unbalanced pulse width of AC sine wave voltage, and
More than or equal to the integer value after the poor rounding of half week of AC sine wave voltage and silicon-controlled unbalanced pulse width, wherein
N is that each clocking value is continuously repeated the number used, and value is equal to multidigit toggle switch incoming level institute in control circuit
Corresponding decimal value；
When control circuit receives in (n+1)th time to the 2n times, (2n+1) to the 3n times ... mn+1 to (m+1) n times
When from the rising edge of the zero passage detection pulse signal of zero cross detection circuit 1, the value of clocking value is gradually successively decreased, and wherein m is indicated
Clocking value is decremented to 0 total degree that successively decreases.
7. remote numerical control soft strater according to claim 1, which is characterized in that
When power switch circuit received from control circuit be high level signal when, power switch circuit is to AC power phase line
Output carries out continuing opening operation.
When power switch circuit received from control circuit be silicon-controlled unbalanced pulse when, power switch circuit is opened silicon-controlled
AC power phase line is exported opening by the rising edge for opening pulse, and when AC power phase line input voltage becomes 0, by alternating current
Source phase line output is closed；
When power switch circuit received from control circuit be low level signal when, power switch circuit is to AC power phase line
Output carries out continuously off operation.
8. remote numerical control soft strater according to claim 1, which is characterized in that
Power switch circuit include the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, capacitance, it is two-way can
Control that silicon, optocoupler be silicon-controlled and triode；
One end of the 6th resistance and second plate of bidirectional triode thyristor, one end of the 7th resistance and AC power phase line input
Connection, the other end pass through the first anode of capacitance connection to bidirectional triode thyristor, one end of the 8th resistance and AC power phase line
Output, the other end of the 8th resistance are connected to the control pole of bidirectional triode thyristor and the first anode that optocoupler is silicon-controlled；
The silicon-controlled second plate of optocoupler is connected to the other end of the 7th resistance；
The anode of the silicon-controlled input side of optocoupler is connected to DC power supply by the 9th resistance, and the cathode of input side is connected to triode
Collector, the emitter ground connection of triode, base stage is connected to the 5th resistance.
9. remote numerical control soft strater according to claim 1, which is characterized in that
The remote numerical control soft strater further comprises surge protection circuit, inputs and connects with AC power phase line, is used for
Absorb the upper peak voltage that may be present of AC power phase line input；
Surge protection circuit includes air discharge tube, the first varistor, the second varistor and third varistor；
First varistor, the second varistor and third varistor are connected in π types；
One end of the public connecting end and air discharge tube of first varistor and third varistor connects, air discharge tube
The other end is grounded；
The public connecting end of first varistor and the second varistor is connected to the input of AC power phase line；
The public connecting end of second varistor and third varistor is connected to the zero curve input of AC power.
10. a kind of control of the remote numerical control soft strater as claimed in any of claims 1 to 9 for AC power
Method processed, which is characterized in that include the following steps：
(1) dead-center position of the upper AC sine wave voltage of zero cross detection circuit detection AC power phase line input, and will detect
The dead-center position be transmitted to control circuit in the form of zero passage detection pulse signal；
(2) control circuit persistently exports low level signal to power switch circuit, and power switch circuit is made to be in continuously off shape
State；
(3) control circuit judges that its external enable signal is that enabled state or disabled state then enter if it is enabled state
Step (4), if it is disabled state, then return to step (2)；
(4) decimal value corresponding to incoming level of the control circuit according to its multidigit toggle switch determines that clocking value is continuous
The frequency n of reuse, and the initial value of clocking value is set；
(5) control circuit starts timing according to the rising edge of zero passage detection pulse signal, when timing reaches clocking value, to power supply
Switching circuit exports silicon-controlled unbalanced pulse；
(6) AC power phase line is exported in the rising edge of silicon-controlled unbalanced pulse and is opened by power switch circuit；
(7) power switch circuit judges whether AC power phase line input voltage becomes 0, if yes then enter step (8), otherwise
It enters step (9)；
(8) AC power phase line is exported and is closed by power switch circuit, and judges whether clocking value access times reach clocking value
It is continuously repeated the frequency n used, is if it is transferred to step (10), otherwise return to step (5)；
(9) power switch circuit keeps the output of AC power phase line, is then back to step (7)；
(10) control circuit updates clocking value, and judges whether updated clocking value is 0, is entered step if equal to 0
(11), otherwise return to step (5)；
(11) control circuit persistently exports high level signal to power switch circuit, so that power switch circuit is in and continues open shape
State；
(12) power switch circuit judges whether the input of AC power phase line powers off, and process terminates if power-off, otherwise enters
Step (13)；
(13) its external enable signal of monitoring control devices；
(14) controller judges whether the state of external enable signal is become disabling from enabled, and if it is return to step (2), no
Then return to step (13).
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