CN108880523A - SCR control device and method - Google Patents
SCR control device and method Download PDFInfo
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- CN108880523A CN108880523A CN201810679551.3A CN201810679551A CN108880523A CN 108880523 A CN108880523 A CN 108880523A CN 201810679551 A CN201810679551 A CN 201810679551A CN 108880523 A CN108880523 A CN 108880523A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
- H03K17/725—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region for ac voltages or currents
Abstract
The disclosure is directed to a kind of SCR control device and methods.The device includes：Zero cross fired optocoupler and silicon-controlled, silicon-controlled, load and AC power source series connection；Zero cross fired optocoupler is connect with AC power source and silicon-controlled control electrode, and receive the pulse width modulating signal from pulse generating unit, wherein, zero cross fired optocoupler is when the pulse width modulating signal received is high level and detects the zero crossing for the alternating current that AC power source provides, trigger voltage is provided to silicon-controlled control electrode, so that controlled silicon conducting.SCR control device and method provided by the embodiment of the present disclosure, opens or closes silicon-controlled in the zero crossing of alternating current, is adjusted to the power of device, and additional electromagnetic interference will not be carried out for device band, and it is simple to control silicon-controlled mode, at low cost.
Description
Technical field
This disclosure relates to automatic control technology field more particularly to a kind of SCR control device and method.
Background technique
In automatic control system, silicon-controlled (Silicon Controlled Rectifier, abbreviation SCR, also referred to as brilliant lock
Pipe) it can be used as high-power driving device, it realizes and controls powerful device with small-power control.In the related technology, pass through phase modulation
Mode controls silicon-controlled conducting, to adjust the power of circuit.But this mode can bring electromagnetic interference
The problems such as (Electromagnetic Interference, abbreviation EMI).
Summary of the invention
To overcome the problems in correlation technique, the disclosure provides a kind of SCR control device and method.
According to the first aspect of the embodiments of the present disclosure, a kind of SCR control device is provided, described device includes：Zero passage touching
Shine coupling and silicon-controlled,
The silicon-controlled, load and AC power source are connected in series；
The zero cross fired optocoupler is connect with the AC power source and the silicon-controlled control electrode, and is received and come from arteries and veins
Rush the pulse width modulating signal of generating device, wherein be high level in the pulse width modulating signal received and detect
When the zero crossing for the alternating current that the AC power source provides, trigger voltage is provided to the silicon-controlled control electrode, so that described
Controlled silicon conducting.
For above-mentioned apparatus, in one possible implementation, the frequency of the pulse width modulating signal be less than or
Equal to the frequency of the alternating current.
It is in one possible implementation, described silicon-controlled to include for above-mentioned apparatus：First one-way SCR and
Two one-way SCRs,
After first one-way SCR and the second one-way SCR reverse parallel connection, with the load and the friendship
Galvanic electricity is source-series,
Wherein, the anode of first one-way SCR is connected to the cathode of second one-way SCR, and described first
The cathode of one-way SCR is connected to the anode of second one-way SCR.
It is in one possible implementation, described silicon-controlled including bidirectional triode thyristor for above-mentioned apparatus.
For above-mentioned apparatus, in one possible implementation, the first end of the zero cross fired optocoupler is for receiving
The pulse width modulating signal, the second end ground connection of the zero cross fired optocoupler, the third end of the zero cross fired optocoupler connects
It is connected to the control electrode of second one-way SCR, it is unidirectional controllable that the 4th end of the zero cross fired optocoupler is connected to described first
The control electrode of silicon；
Wherein, it is high level in the pulse width modulating signal that the zero cross fired optocoupler receives and detects described
When the zero crossing of alternating current, control electrode from the zero cross fired optocoupler to first one-way SCR, described second unidirectionally may be used
The control electrode for controlling silicon provides trigger voltage, so that first one-way SCR or second one-way SCR conducting.
For above-mentioned apparatus, in one possible implementation, described device further includes：First resistor, second resistance,
First diode and the second diode,
After the first resistor and the first diode are in parallel, be connected to second one-way SCR control electrode and
Between the cathode of second one-way SCR；
After the second resistance and second diodes in parallel, be connected to first one-way SCR control electrode and
Between the cathode of first one-way SCR.
For above-mentioned apparatus, in one possible implementation, the first end of the zero cross fired optocoupler is for receiving
The pulse width modulating signal, the zero cross fired optocoupler second end ground connection, the third end of the zero cross fired optocoupler and
4th end is connected respectively to the anode and control electrode of the bidirectional triode thyristor；
Wherein, it is high level in the pulse width modulating signal that the zero cross fired optocoupler receives and detects described
When the zero crossing of alternating current, the zero cross fired optocoupler provides trigger voltage to the control electrode of the bidirectional triode thyristor, so that institute
State bidirectional triode thyristor conducting.
For above-mentioned apparatus, in one possible implementation, described device further includes：3rd resistor, the 4th resistance
With third diode,
After the 3rd resistor and the third diodes in parallel, it is connected to the control electrode and cathode of the bidirectional triode thyristor
Between；
4th resistance is connected between the anode of the bidirectional triode thyristor and the third end of the zero cross fired optocoupler.
For above-mentioned apparatus, in one possible implementation, described device further includes：5th resistance and capacitor,
After 5th resistance and capacitor series connection, it is parallel-connected to the silicon-controlled both ends.
For above-mentioned apparatus, in one possible implementation, the zero cross fired optocoupler is wide in the pulse received
When degree modulated signal is high level, zero-crossing examination is carried out to the alternating current, and in the zero crossing for detecting the alternating current
When, trigger voltage is provided to the silicon-controlled control electrode.
According to the second aspect of an embodiment of the present disclosure, a kind of SCR control method is provided, is applied to SCR control and fills
In setting, described device includes zero cross fired optocoupler and silicon-controlled, the method includes：
When the pulse width modulating signal that the zero cross fired optocoupler receives is high level, AC power source is provided
Alternating current carries out zero-crossing examination；
When detecting the zero crossing of the alternating current, trigger voltage is provided to the silicon-controlled control electrode.
The technical scheme provided by this disclosed embodiment can include the following benefits：Zero cross fired optocoupler is receiving
Pulse width modulating signal be high level and when detecting the zero crossing for the alternating current that AC power source provides, to silicon-controlled
Control electrode provides trigger voltage, so that controlled silicon conducting, is load supplying.It is opened or closed controllably in the zero crossing of alternating current
Silicon is adjusted the power of device, will not carry out additional electromagnetic interference for device band, and it is simple to control silicon-controlled mode, at
This is low.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
The disclosure can be limited.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the disclosure
Example, and together with specification for explaining the principles of this disclosure.
Fig. 1 is a kind of electrical block diagram of SCR control device shown according to an exemplary embodiment；
Fig. 2 is the middle alternating current and pulse width tune of a kind of SCR control device shown according to an exemplary embodiment
The waveform diagram of signal processed；
Fig. 3 is a kind of electrical block diagram of SCR control device shown according to an exemplary embodiment；
Fig. 4 is a kind of electrical block diagram of SCR control device shown according to an exemplary embodiment；
Fig. 5 is a kind of electrical block diagram of SCR control device shown according to an exemplary embodiment；
Fig. 6 is a kind of flow chart of SCR control method shown according to an exemplary embodiment.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all implementations consistent with this disclosure.On the contrary, they be only with it is such as appended
The example of the consistent device and method of some aspects be described in detail in claims, the disclosure.
Fig. 1 is a kind of electrical block diagram of SCR control device shown according to an exemplary embodiment.Such as Fig. 1
Shown, which includes zero cross fired optocoupler OCEP and silicon-controlled Q.Silicon-controlled Q, load LOAD and alternating current
Source AC is connected in series.Zero cross fired optocoupler OCEP is connect with the control electrode of AC power source AC and silicon-controlled Q, and is received and come from arteries and veins
Rush the pulse width modulating signal TRIGGER of generating device.Wherein, it is in the pulse width modulating signal TRIGGER received
High level and detect AC power source AC provide alternating current zero crossing when, to the control electrode of silicon-controlled Q provide triggering electricity
Pressure, so that silicon-controlled Q is connected.Zero cross fired optocoupler OCEP is the optocoupler for being able to detect that the zero crossing of alternating current.
In the present embodiment, after controlled silicon conducting, alternating current is input in load, allows to work normally.Detection
To the zero crossing of alternating current can be the point that voltage value in alternating current is zero.It can be according to its control of controlled silicon conducting required input
The minimum voltage value of pole processed is configured the value of the high level of zero cross fired optocoupler and pulse width modulating signal, so that mistake
Zero triggering optocoupler, which provides trigger voltage to silicon-controlled control electrode, can trigger controlled silicon conducting.Zero cross fired optocoupler is to refer to
Detect any optocoupler of the zero crossing of alternating current.Load can be the device that can be arbitrarily driven by silicon-controlled and AC power source
Part, the disclosure to this with no restriction.
In the present embodiment, pulse width modulating signal is to modulate (Pulse Width using pulse width
Modulation, abbreviation PWM) control technology signal generated.It can be by adjusting the duty ratio of pulse width modulating signal
Silicon-controlled turn-on time is controlled, to achieve the purpose that control power.Pulse generating unit can be can be according to setting
Set issue pulse width modulating signal any device, the disclosure to this with no restriction.
SCR control device provided by the embodiment of the present disclosure, zero cross fired optocoupler is in the pulse width modulation received
When signal is high level and detects the zero crossing for the alternating current that AC power source provides, triggering is provided to silicon-controlled control electrode
Voltage, so that controlled silicon conducting, is load supplying.Opened or closed in the zero crossing of alternating current it is silicon-controlled, to the power of device
It is adjusted, additional electromagnetic interference will not be carried out for device band, it is simple to control silicon-controlled mode, at low cost.
In one possible implementation, the frequency of pulse width modulating signal may be less than or equal to the frequency of alternating current
Rate.
Wherein, the frequency of pulse width modulating signal is less than or equal to the frequency of alternating current, is to guarantee zero cross fired
Optocoupler can be turned on or off in the zero-crossing of alternating current of needs, achieve the purpose that adjust power.Pulse width modulating signal
Frequency can be the 0.5 of the frequency of alternating current, 0.7 times etc., the disclosure to this with no restriction.
In this implementation, it frequency, the duty ratio of pulse-width modulateds signal such as can need according to power adjustment
Etc. being configured, to achieve the purpose that adjust power.It can also be according to the working characteristics pulse-width modulated signal of load
Frequency, duty ratio are adjusted, to meet the needs of load is to power supply.
In one possible implementation, zero cross fired optocoupler OCEP is in the pulse width modulating signal received
When TRIGGER is high level, zero-crossing examination is carried out to alternating current, and in the zero crossing for detecting alternating current, to silicon-controlled Q
Control electrode provide trigger voltage.
In this implementation, zero cross fired optocoupler is when the pulse width modulating signal received is high level, zero passage
The photophore triggered in optocoupler shines, and light-receiving device receives to generate photoelectric current after light, needed for the amplified acquisition of photoelectric current
Trigger voltage.Trigger voltage is supplied to silicon-controlled control electrode in the zero crossing for detecting alternating current by zero cross fired optocoupler,
So that controlled silicon conducting.
Fig. 2 is the middle alternating current and pulse width tune of a kind of SCR control device shown according to an exemplary embodiment
The waveform diagram of signal processed.As shown in Fig. 2, zero cross fired optocoupler receives pulse width modulating signal as shown in Figure 2, zero passage
Optocoupler is triggered at t1, t2, t5, t6, t9 and t10 moment to silicon-controlled offer trigger voltage.It is silicon-controlled receive trigger voltage after
Conducting is load supplying, and is closed in the zero crossing of next alternating current, is stopped as load supplying.Existed with zero cross fired optocoupler
T1, t2 moment be it is silicon-controlled trigger voltage is provided for, it is silicon-controlled after t1 reception to trigger voltage, it is silicon-controlled can be
1~t2 of time period t conducting is load supplying, and is disconnected at the zero crossing of next alternating current (t2).But due to t2 moment zero passage
Optocoupler is triggered again to silicon-controlled offer trigger voltage, silicon-controlled continuation is load supplying in 2~t3 of time period t conducting, and
It is disconnected in the zero crossing (t3) of next alternating current.Can make it is silicon-controlled be turned on or off in zero-crossing of alternating current, and in t1
~t2, t2~t3, t5~t6, t6~t7, t9~t10, t10~t11 period is load supplying, realizes the tune of power
It is whole.
Fig. 3 is a kind of electrical block diagram of SCR control device shown according to an exemplary embodiment.Such as Fig. 3
Shown, in one possible implementation, which can also include：5th resistance R5 and capacitor C.5th resistance R5 and
After capacitor C in series, it is parallel-connected to the both ends of silicon-controlled Q.To guarantee that the stability of device work, protective device avoid electricity
Magnetic disturbance has an adverse effect to device.
In one possible implementation, as shown in figure 3, the device can also include the 6th resistance R6.6th electricity
Resistance R6 is connected between the control electrode of silicon-controlled Q and the 4th end of zero cross fired optocoupler OCEP.Flow into silicon-controlled Q's to adjust
Current value protects silicon-controlled Q so that the current value for flowing into silicon-controlled Q is less than the gate pole peak inrush current of silicon-controlled Q.
Fig. 4 is a kind of electrical block diagram of SCR control device shown according to an exemplary embodiment.Such as Fig. 4
Shown, in one possible implementation, silicon-controlled Q may include the first one-way SCR Q1 and the second one-way SCR
Q2.After first one-way SCR Q1 and the second one-way SCR Q2 reverse parallel connection, connect with load LOAD and AC power source AC.
Wherein, the anode of the first one-way SCR Q1 is connected to the cathode of the second one-way SCR Q2, the yin of the first one-way SCR Q1
Pole is connected to the anode of the second one-way SCR Q2.
In this implementation, the alternating current between the anode and cathode for being applied to the first one-way SCR is positive defeated
Enter and when the control electrode of the first one-way SCR receives trigger voltage, the conducting of the first one-way SCR；It is single being applied to second
It is that forward direction inputs and the control electrode of the second one-way SCR receives triggering to the alternating current between silicon-controlled anode and cathode
When voltage, the conducting of the second one-way SCR.In this way, guaranteeing unidirectionally may be used by control first in the whole cycle of alternating current
Silicon or the conducting of the second one-way SCR are controlled, is the load supplying of various power.
In one possible implementation, as shown in figure 4, the first end 1 of zero cross fired optocoupler OCEP is for receiving arteries and veins
Bandwidth modulation signals TRIGGER is rushed, the second end 2 of zero cross fired optocoupler OCEP is grounded, the third end 6 of zero cross fired optocoupler OCEP
It is connected to the control electrode of the second one-way SCR Q2, the 4th end 4 of zero cross fired optocoupler OCEP is connected to the first one-way SCR
The control electrode of Q1.
The anode of first one-way SCR Q1 is connected to the anode of AC power source AC, and the cathode of the first one-way SCR Q1 connects
It is connected to one end of load LOAD.The anode of second one-way SCR Q2 is connected to one end of load LOAD, the second one-way SCR
The cathode of Q2 is connected to the anode of AC power source AC, and the other end for loading LOAD is connected to the cathode of AC power source AC, i.e., controllably
Silicon, load and AC power source series connection.
Wherein, it is high level in the pulse width modulating signal TRIGGER that zero cross fired optocoupler OCEP is received and detects
To alternating current zero crossing when, control electrode of the zero cross fired optocoupler OCEP to the first one-way SCR Q1, the second one-way SCR
The control electrode of Q2 provides trigger voltage, so that the first one-way SCR Q1 or the second one-way SCR Q2 conducting.
When in this implementation, in the alternating current in such as Fig. 2 and pulse width modulating signal input unit, zero passage touching
Luminous coupling provides trigger voltage to the first one-way SCR and the second one-way SCR at t1, t2, t5, t6, t9 and t10 moment.
Then the first one-way SCR and the second one-way SCR receive trigger voltage in t1, since between t1~t2, access first is single
It is positive input to the alternating current between silicon-controlled anode and cathode, then between t1~t2, the conducting of the first one-way SCR,
For load supplying.Then the first one-way SCR disconnects after the zero crossing (t2) of next alternating current, stops supplying for load
Electricity.Then, the first one-way SCR and the second one-way SCR receive trigger voltage in t2 again, due between t2~t3,
The alternating current between the anode and cathode of the second one-way SCR is accessed as positive input, then between t2~t3, second is unidirectional
Controlled silicon conducting is load supplying.Then the second one-way SCR disconnects after the zero crossing (t3) of next alternating current, stops
It is only load supplying.In this way, in t1~t2, t5~t6, the first one-way SCR can be led in these three periods of t9~t10
Logical, in t2~t3, t6~t7, the second one-way SCR can be connected in these three periods of t10~t11.
In one possible implementation, as shown in figure 4, described device can also include first resistor R1, the second electricity
Hinder R2, first diode D1 and the second diode D2.After first resistor R1 and first diode D1 are in parallel, it is unidirectional to be connected to second
Between the control electrode of silicon-controlled Q2 and the cathode of the second one-way SCR Q2.After second resistance R2 and the second diode D2 are in parallel,
It is connected between the control electrode of the first one-way SCR Q1 and the cathode of the first one-way SCR Q1.
In this implementation, the first resistor being connected between the control electrode and cathode of the first one-way SCR and first
Diode can stablize the trigger voltage of the control electrode of the first one-way SCR of input, to guarantee that the trigger voltage can trigger
The conducting of first one-way SCR.Similarly, be connected to second resistance between the control electrode and cathode of the second one-way SCR and
Second diode can stablize the trigger voltage of the control electrode of the second one-way SCR of input, to guarantee that the trigger voltage can be with
Trigger the conducting of the second one-way SCR.
In the present embodiment, the third end 6 of zero cross fired optocoupler OCEP may be connected to the anode of AC power source AC, or pass through
First resistor R1 and first diode D1 after parallel connection are connected to the anode of AC power source AC.The 4th of zero cross fired optocoupler OCEP
End 4 may be connected to above-mentioned one end of load LOAD, or is connected to by second resistance R2 after parallel connection and the second diode D2 negative
Carry above-mentioned one end of LOAD, or by the 6th resistance R6, it is in parallel after second resistance R2 and the second diode D2 be connected to load
Above-mentioned one end of LOAD, to carry out zero-crossing examination.
Fig. 5 is a kind of electrical block diagram of SCR control device shown according to an exemplary embodiment.Such as Fig. 5
Shown, in one possible implementation, silicon-controlled Q may include bidirectional triode thyristor Q3.
In this implementation, alternating current passes through and bidirectional triode thyristor between the anode and cathode of bidirectional triode thyristor
Control electrode when receiving trigger voltage, bidirectional triode thyristor conducting, and being disconnected in the zero crossing of next alternating current.It is in load
When low-power load, the silicon-controlled of device can choose bidirectional triode thyristor, preferably for load supplying.
In one possible implementation, as shown in figure 5, the first end 1 of zero cross fired optocoupler OCEP is for receiving arteries and veins
Bandwidth modulation signals TRIGGER is rushed, the second end 2 of zero cross fired optocoupler OCEP is grounded, the third end 6 of zero cross fired optocoupler OCEP
The anode and control electrode of bidirectional triode thyristor Q3 are connected respectively to the 4th end 4.
The anode of bidirectional triode thyristor Q3 is connected to the anode of AC power source AC, and the cathode of bidirectional triode thyristor Q3 is connected to load
One end of LOAD loads the cathode of the other end connection AC power source AC of LOAD, i.e., silicon-controlled, load and AC power source series connection.
Wherein, it is high level in the pulse width modulating signal TRIGGER that zero cross fired optocoupler OCEP is received and detects
To alternating current zero crossing when, zero cross fired optocoupler OCEP will provide trigger voltage to the control electrode of bidirectional triode thyristor Q3 so that
Bidirectional triode thyristor Q3 conducting.
When in this implementation, in the alternating current in such as Fig. 2 and pulse width modulating signal input unit, zero passage touching
Luminous coupling provides trigger voltage to bidirectional triode thyristor at t1, t2, t5, t6, t9 and t10 moment.Then bidirectional triode thyristor t1~t2,
T2~t3, t5~t6, t6~t7, t9~t10, t10~t11 conducting, are load supplying.
In one possible implementation, as shown in figure 5, the device further include 3rd resistor R3, the 4th resistance R4 and
Third diode D3.After 3rd resistor R3 and third diode D3 are in parallel, it is connected to the control electrode and cathode of bidirectional triode thyristor Q3
Between.4th resistance R4 is connected between the anode of bidirectional triode thyristor Q3 and the third end 6 of zero cross fired optocoupler OCEP.
In this implementation, 3rd resistor and third diode can stablize the trigger voltage of input bidirectional triode thyristor,
To guarantee that the trigger voltage can trigger the conducting of bidirectional triode thyristor.The adjustable electricity for flowing into zero cross fired optocoupler of 4th resistance
Flow valuve protects zero cross fired optocoupler.
In the present embodiment, the third end 6 of zero cross fired optocoupler OCEP can connect the anode of AC power source AC, or pass through
The anode of 4th resistance R4 connection AC power source AC, the 4th end 4 of zero cross fired optocoupler OCEP can connect the above-mentioned of load LOAD
One end, or the above-mentioned one end for loading LOAD is connected with third diode D3 by the 3rd resistor R3 after parallel connection, or pass through the 6th
3rd resistor R3 after resistance R6, parallel connection connects above-mentioned one end of load LOAD with third diode D3, with the mistake to alternating current
Zero point is detected.
It in the present embodiment, can be according to load, silicon-controlled, zero cross fired optocoupler parameter to resistance, the electricity in device
Container, the type of diode, parameter are selected, the disclosure to this with no restriction.
Fig. 6 is a kind of flow chart of SCR control method shown according to an exemplary embodiment.As shown in fig. 6, should
Method is applied to above-mentioned include zero cross fired optocoupler and silicon-controlled SCR control device.The method comprising the steps of S11 and step
Rapid S12.
In step s 11, when the pulse width modulating signal that zero cross fired optocoupler receives is high level, to alternating current
The alternating current that source provides carries out zero-crossing examination.
In step s 12, in the zero crossing for detecting alternating current, trigger voltage is provided to silicon-controlled control electrode.
SCR control device provided by the embodiment of the present disclosure controls zero cross fired optocoupler in the pulse width received
When modulated signal is high level and detects the zero crossing of alternating current, trigger voltage is provided to silicon-controlled control electrode, so that can
Silicon conducting is controlled, is load supplying.It is opened or closed in the zero crossing of alternating current silicon-controlled, power is adjusted, will not be dress
It sets and brings additional electromagnetic interference, it is simple to control silicon-controlled mode, at low cost.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to its of the disclosure
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Person's adaptive change follows the general principles of this disclosure and including the undocumented common knowledge in the art of the disclosure
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the disclosure are by following
Claim is pointed out.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by the accompanying claims.
Claims (11)
1. a kind of SCR control device, which is characterized in that described device includes：Zero cross fired optocoupler and silicon-controlled,
The silicon-controlled, load and AC power source are connected in series；
The zero cross fired optocoupler is connect with the AC power source and the silicon-controlled control electrode, and is received and sent out from pulse
The pulse width modulating signal of generating apparatus, wherein be high level in the pulse width modulating signal received and detect described
When the zero crossing for the alternating current that AC power source provides, trigger voltage is provided to the silicon-controlled control electrode, so that described controllable
Silicon conducting；
The zero cross fired optocoupler is the optocoupler for being able to detect that the zero crossing of alternating current.
2. the apparatus according to claim 1, which is characterized in that the frequency of the pulse width modulating signal is less than or equal to
The frequency of the alternating current.
3. the apparatus according to claim 1, which is characterized in that described silicon-controlled to include：First one-way SCR and second
One-way SCR,
After first one-way SCR and the second one-way SCR reverse parallel connection, with the load and the alternating current
It is source-series,
Wherein, the anode of first one-way SCR is connected to the cathode of second one-way SCR, and described first is unidirectional
Silicon-controlled cathode is connected to the anode of second one-way SCR.
4. the apparatus according to claim 1, which is characterized in that described silicon-controlled including bidirectional triode thyristor.
5. device according to claim 3, which is characterized in that
The first end of the zero cross fired optocoupler is for receiving the pulse width modulating signal, and the of the zero cross fired optocoupler
Two ends ground connection, the third end of the zero cross fired optocoupler are connected to the control electrode of second one-way SCR, the zero passage touching
4th end of luminous coupling is connected to the control electrode of first one-way SCR；
Wherein, it is high level in the pulse width modulating signal that the zero cross fired optocoupler receives and detects the exchange
When the zero crossing of electricity, control electrode of the zero cross fired optocoupler to first one-way SCR, second one-way SCR
Control electrode provide trigger voltage so that first one-way SCR or second one-way SCR conducting.
6. device according to claim 5, which is characterized in that described device further includes：First resistor, second resistance,
One diode and the second diode,
After the first resistor and the first diode are in parallel, it is connected to the control electrode of second one-way SCR and described
Between the cathode of second one-way SCR；
After the second resistance and second diodes in parallel, it is connected to the control electrode of first one-way SCR and described
Between the cathode of first one-way SCR.
7. device according to claim 4, which is characterized in that
The first end of the zero cross fired optocoupler is for receiving the pulse width modulating signal, and the of the zero cross fired optocoupler
Two ends ground connection, the third end and the 4th end of the zero cross fired optocoupler are connected respectively to anode and the control of the bidirectional triode thyristor
Pole；
Wherein, it is high level in the pulse width modulating signal that the zero cross fired optocoupler receives and detects the exchange
When the zero crossing of electricity, the zero cross fired optocoupler provides trigger voltage to the control electrode of the bidirectional triode thyristor, so that described double
To controlled silicon conducting.
8. device according to claim 7, which is characterized in that described device further includes：3rd resistor, the 4th resistance and
Three diodes,
After the 3rd resistor and the third diodes in parallel, be connected to the bidirectional triode thyristor control electrode and cathode it
Between；
4th resistance is connected between the anode of the bidirectional triode thyristor and the third end of the zero cross fired optocoupler.
9. the apparatus according to claim 1, which is characterized in that described device further includes：5th resistance and capacitor,
After 5th resistance and capacitor series connection, it is parallel-connected to the silicon-controlled both ends.
10. the apparatus according to claim 1, which is characterized in that the zero cross fired optocoupler is in the pulse width received
When modulated signal is high level, zero-crossing examination is carried out to the alternating current, and when detecting the zero crossing of the alternating current,
Trigger voltage is provided to the silicon-controlled control electrode.
11. a kind of SCR control method, which is characterized in that be applied in SCR control device, described device includes zero passage
Optocoupler and silicon-controlled is triggered, the method includes：
Exchange when the pulse width modulating signal that the zero cross fired optocoupler receives is high level, to AC power source offer
Electricity carries out zero-crossing examination；
When detecting the zero crossing of the alternating current, trigger voltage is provided to the silicon-controlled control electrode.
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