CN102006042B - Controllable alternating current switching circuit - Google Patents
Controllable alternating current switching circuit Download PDFInfo
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- CN102006042B CN102006042B CN 201010285299 CN201010285299A CN102006042B CN 102006042 B CN102006042 B CN 102006042B CN 201010285299 CN201010285299 CN 201010285299 CN 201010285299 A CN201010285299 A CN 201010285299A CN 102006042 B CN102006042 B CN 102006042B
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Abstract
The invention relates to a controllable alternating current switching circuit which controls the switching-on or the switching-off of an alternating current utilized in the field of power supply and electronic control. The circuit at least comprises alternating current input ends AC1 and AC2 and a switching output end K, and at least comprises an alternating current switching circuit unit, a current detection circuit unit, a current amplifying circuit unit, a voltage reference circuit unit, a voltage comparison circuit unit, an overcurrent protection circuit unit, a zero passage signal circuit unit, a zero switching control circuit unit, an internal control signal isolation circuit unit and a power supply circuit unit. The controllable alternating current switching circuit as an electricity saver is connected between the power supply of an electronic apparatus and an alternating current power grid, can effectively reduce an input power of the power supply during standby or no-load; when utilized as a controllable alternating current switch, the controllable alternating current switching circuit can realize a zero voltage switch and the over-current and short circuit protection, has quick switching speed, less harmonic interference and high reliability.
Description
Technical field
The present invention relates to field of power supplies and electrical equipment control field; Specifically being meant and can reducing power supply in standby or a kind of power save circuit of input power consumption when non-loaded, also is a kind of controlled alternating current switching circuit of functions such as the switch control that realizes the interchange input of various electric equipments, motor, inductive load etc., protection.
Background technology
Along with the develop rapidly of electronic technology, electric equipment products is used by a large amount of, also makes the electric energy lot of consumption thereupon.In fact; Electric equipment products standby or the input power consumption when non-loaded are the power losss of fixing, though electric equipment products need not, this part electric energy also will be consumed; Therefore; Reducing power supply and can reduce electric energy by in vain waste in standby or the input power consumption when non-loaded, help energy-saving and emission-reduction, is the effective means that delays energy resource consumption.For this reason, national governments and mechanism have also put into effect and the corresponding efficiency standard of energy-saving and emission-reduction in succession.
On the other hand, existing high-power controlled alternating-current switch such as solid-state relay, its inner alternating-current switch generally adopts the power device of current-control type, like two one-way SCRs reverse parallel connection or single bidirectional triode thyristor each other.This device trigger current is generally more than 5 milliamperes, even reaches tens milliamperes, and drive loss is bigger, is unfavorable for satisfying energy-conservation requirement.Existing high-power controlled alternating-current switch is adopting two one-way SCRs each other during reverse parallel connection; Though the driving of positive negative sense wants balance a bit comparatively speaking, because of device count is many, manufacturing cost is high; And adopt single bidirectional triode thyristor as controlled alternating-current switch; Then because of the architectural characteristic of bidirectional triode thyristor own makes that the driving of positive negative sense is not a symmetry very, and powerful bidirectional triode thyristor trigger current is big, and operating rate can be slow; Current tail influence during shutoff is serious, is easy to generate very strong Harmonic Interference and power loss.
Summary of the invention
The technical problem that the present invention need solve is:
(1), the power supply that reduces power consumption equipment is in standby or the input power consumption when non-loaded;
(2), solution is as the asymmetric problem of positive negative sense drive waveforms of the The Trigger of Bidirectional Triode Thyristor circuit of alternating-current switch;
(3), solve greatly as the bidirectional triode thyristor drive current of alternating-current switch, cause the problem that the drive circuit loss increases;
(4), to solve bidirectional triode thyristor alternating-current switch operating rate slow, the current tail influence during shutoff is serious, the problem of the Harmonic Interference that easy generation is very strong.
For solving the problems of the technologies described above, the technical scheme that the present invention taked is:
A kind of controlled alternating current switching circuit is provided, comprises alternating current switching circuit unit, current detection circuit unit, current amplification circuit unit, voltage reference circuit unit, voltage comparator circuit unit, zero cross signal circuit unit, zero ON-OFF control circuit unit, internal control signal buffer circuit unit at least; Said alternating current switching circuit unit has output switching terminal K, between said alternating current switching circuit unit and current detection circuit units in series and ac input end AC2, the AC1; Said current detection circuit unit detects the electric current of the reflection power consumption equipment operating state that flows through the alternating current switching circuit unit;, the current amplification circuit unit exports to voltage comparison unit after amplifying; With the reference voltage that voltage reference circuit unit output is arranged relatively after, the output signal is as one road input signal of zero ON-OFF control circuit unit; The pulsewidth of said zero cross signal circuit unit, alternating current zero crossing switch forms the in addition two-way input signal of circuit unit as zero ON-OFF control circuit unit, and three road signals are exported to internal control signal buffer circuit cell isolation and driven alternating current switching circuit unit inner alternating-current switch conducting and disconnection after zero ON-OFF control circuit cell processing.Above-mentioned controlled alternating current switching circuit can be used as power supply energy-saving circuit module, is connected with the power circuit of power consumption equipment.
When described controlled alternating current switching circuit module was used as the power-supply saving device, power consumption equipment was connected with power input AC2 and output switching terminal K.
Similar with technique scheme; The present invention also provides a kind of controlled alternating current switching circuit, comprises alternating current switching circuit unit, current detection circuit unit, current amplification circuit unit, voltage reference circuit unit, voltage comparator circuit unit, zero cross signal circuit unit, zero ON-OFF control circuit unit, internal control signal buffer circuit unit at least; Said alternating current switching circuit unit has output switching terminal K, between said alternating current switching circuit unit and current detection circuit units in series and ac input end AC2, the AC1; Said current detection circuit unit detects the electric current of the reflection power consumption equipment operating state that flows through the alternating current switching circuit unit;, the current amplification circuit unit exports to voltage comparison unit after amplifying; With the reference voltage that voltage reference circuit unit output is arranged relatively after, the output signal is as one road input signal of zero ON-OFF control circuit unit; The two-way input signal in addition of said zero cross signal circuit unit, external control signal buffer circuit unit conduct zero ON-OFF control circuit unit, three road signals are exported to alternating-current switch conducting and the disconnection that internal control signal buffer circuit cell isolation drives inside, alternating current switching circuit unit after zero ON-OFF control circuit cell processing.When the said controlled alternating current switching circuit of this technical scheme directly uses as controlled alternating-current switch, directly be connected with power consumption equipment.
When described controlled alternating current switching circuit module is used as controlled alternating-current switch, have external control signal end V+, V-, external control signal end V+, V-one end are connected with external control signal buffer circuit unit, and the other end is connected with power consumption equipment.Power consumption equipment also is connected with power input AC2 and output switching terminal K.
Further, all can increase the overcurrent that is used to realize power consumption equipment or power supply, the current foldback circuit unit of short-circuit protection function in above-mentioned two basic schemes; And comprise that also each functional circuit provides the power circuit unit of power supply.
Compared with prior art; Beneficial effect of the present invention is: described controlled alternating current switching circuit is as power supply energy-saving circuit module, when power supply in standby or when non-loaded, inner alternating-current switch is closed a period of time after by the time conducting of setting; The electric energy that makes power supply obtain reduces; The input power consumption just significantly reduces, and energy-saving effect is obvious, has remarkable social benefit and economic benefit.
Simultaneously, when described controlled alternating current switching circuit used as controlled alternating-current switch, internal circuit had comprised the zero passage detection control circuit, and controlled alternating-current switch all is when the sinusoidal ac zero passage, to carry out switch, and Harmonic Interference is smaller; The switch that controlled alternating current switching circuit inside adopts a control type bidirectional switch to trigger bidirectional triode thyristor realization interchange is controlled or is directly adopted field control type bidirectional switch as alternating-current switch; Field control type device drive current is little; Switching speed is fast, makes the Harmonic Interference that produces in the switching process further reduce.
With respect to prior art, beneficial effect of the present invention also is:
1), can realize modularization, be beneficial to batch process;
2), diverse in function, both can be used as the power-supply saving device and used, can be used as controlled alternating-current switch again and use, when using, superiority is more arranged than electromagnetic mechanical relay as solid-state relay;
3), applied widely, being used to control input, to present the load or the power consumption equipment effect of perception superior.
Description of drawings
Fig. 1 is the theory diagram of controlled alternating current switching circuit of the present invention;
Fig. 2 is first kind of theory diagram of the inner alternating current switching circuit unit of controlled alternating current switching circuit of the present invention;
Fig. 3 is that controlled alternating current switching circuit module of the present invention is during as controlled alternating-current switch and the annexation figure of power consumption equipment;
Fig. 4 is the inner two-way gate-controlled switch circuit unit of the field control type practical implementation circuit diagram in alternating current switching circuit of the present invention unit;
Fig. 5 is first kind of practical implementation circuit theory diagrams of the inner alternating current switching circuit unit of controlled alternating current switching circuit of the present invention;
Fig. 6 is second kind of practical implementation circuit theory diagrams of the inner alternating current switching circuit unit of controlled alternating current switching circuit of the present invention;
Fig. 7 is controlled alternating current switching circuit of the present invention first kind of practical implementation circuit diagram in other unit except that the alternating current switching circuit unit;
Fig. 8 is controlled alternating current switching circuit of the present invention second kind of practical implementation circuit diagram in other unit except that the alternating current switching circuit unit.
Embodiment
For the ease of those skilled in the art will recognize that technical scheme of the present invention is done further to describe in detail below in conjunction with specific embodiment and accompanying drawing.
Referring to Fig. 1, Fig. 3, controlled alternating current switching circuit according to the invention inside should comprise alternating current switching circuit unit, current detection circuit unit, current amplification circuit unit, voltage reference circuit unit, voltage comparator circuit unit, zero cross signal circuit unit, zero ON-OFF control circuit unit, internal control signal buffer circuit unit, power circuit unit at least.Said controlled alternating current switching circuit uses as module, has two ac input end AC1, AC2 and an output switching terminal K at least.
When said controlled alternating current switching circuit used as power-supply saving device circuit, the pulsewidth that the alternating current zero crossing switch is set up in inside formed circuit unit.Concrete; This module is to be connected in the input circuit of power consumption equipment power supply; The ac input end 5 of power consumption equipment power supply and the output switching terminal K of module are connected; The ac input end 4 of power consumption equipment power supply and the ac input end AC2 of module are connected, and the ac input end AC1 and the ac input end AC2 of module then insert the single phase alternating current (A.C.) civil power.
During work; Detect the electric current of the reflection power consumption equipment operating state that flows through the alternating current switching circuit unit by the current detection circuit unit; After current amplification circuit unit, voltage reference circuit unit, voltage comparator circuit cell processing as one road input signal of internal control signal buffer circuit unit; And forming the in addition two-way input signal of circuit unit output signal as the zero passage switch control circuit unit by the pulsewidth of zero cross signal circuit unit, alternating current zero crossing switch, these signals are exported to internal control signal buffer circuit cell isolation and are driven alternating current switching circuit unit inner alternating-current switch conducting and disconnection after zero passage ON-OFF control circuit cell processing.When power consumption equipment standby or power supply zero load; This road output low level of voltage comparator circuit unit; Then have only this road signal of pulsewidth formation circuit unit of alternating current zero crossing switch to work; The signal of internal control signal buffer circuit cell isolation output is with the ac synchronous zero passage switch and by the repetition pulse string of setting service time and turn-off time; Then the inner alternating-current switch in alternating current switching circuit unit repeats conducting and disconnection by this rule, and the average power that power consumption equipment feasible and the alternating current switching circuit units in series obtains reduces, thus saves energy.
Like Fig. 3, when said controlled alternating current switching circuit used as controlled alternating-current switch, external control signal buffer circuit unit was set up in inside, and the pulsewidth of alternating current zero crossing switch forms circuit unit then not to be needed.Concrete; Module is connected between controlled power consumption equipment and the single-phase alternating current; The signal input end V+ of controlled alternating current switching circuit module is connected with 9 with the control signal output ends 8 of controlled power consumption equipment respectively with V-; The ac input end 7 of controlled power consumption equipment is connected with the output switching terminal K of controlled alternating current switching circuit module; The ac input end 6 of controlled power consumption equipment is connected with the ac input end AC2 of controlled alternating current switching circuit module, and the ac input end AC1 and the ac input end AC2 of module then insert the single phase alternating current (A.C.) civil power.Controlled alternating current switching circuit is controlled by external control signal isolation drive realization alternating current zero crossing synchro switch.Other operation principle is the same when using as power-supply saving device circuit.
In above-mentioned two kinds of environments for use, said controlled alternating current switching circuit all can be set up the current foldback circuit unit, realizes overcurrent, the short-circuit protection function of power consumption equipment or power supply, makes equipment avoid damaging.The embodiment block diagram is seen Fig. 1.
As shown in Figure 2; During practical implementation; Said alternating current switching circuit unit comprises the alternating-current switch interior power supply circuit unit that is connected with ac input end AC2; Drive circuit unit, the two-way gate-controlled switch circuit unit of field control type that an end is connected with drive circuit unit, the other end is connected with output switching terminal K, said drive circuit unit connects internal control signal buffer circuit unit.Perhaps, can further comprise bi-directional thyristor switch, it is connected between two-way gate-controlled switch circuit unit of a control type and the above-mentioned output switching terminal K.
More specifically; The inner two-way gate-controlled switch circuit unit of field control type in said alternating current switching circuit unit is made up of FET QA, QB, and the source electrode of FET QA, QB, grid link together as new source electrode, a grid of the two-way gate-controlled switch device of control type; The drain electrode of QA, QB as the i.e. output switching terminal K of this module of the first output switching terminal K1 of the two-way gate-controlled switch device of control type and the second switch output K2. first output switching terminal K1, is connected with power consumption equipment respectively; Second switch output K2 is connected with the current detection circuit unit.The concrete scheme of described the two-way gate-controlled switch circuit unit of control type has been used FET after adding suitable forward voltage between grid and the source electrode, and the characteristic that the channel current between drain electrode and the source electrode can two-way flow is seen Fig. 4.
Fig. 5 is first kind of practical implementation circuit theory diagrams of alternating current switching circuit unit in the described controlled alternating current switching circuit of the utility model.Among the embodiment, said controlled alternating current switching circuit comprises ac input end AC1, ac input end AC2 and three internal circuit links 1,2,3.Implement circuit and form pulsewidth formation circuit unit, the power circuit unit that unit pack is drawn together current detection circuit unit, current amplification circuit unit, voltage reference circuit unit, voltage comparator circuit unit, current foldback circuit unit, zero cross signal circuit unit, zero ON-OFF control circuit unit, internal control signal buffer circuit unit, alternating current zero crossing switch.The current detection circuit unit adopts resistance R 23; Internal control signal buffer circuit unit adopts photoelectrical coupler OP1; The power circuit unit is by capacitor C 0, C1, C2, diode D1, D2, and resistance R 0, NPN type triode Q1, voltage-stabiliser tube ZD1 forms; The current amplification circuit unit is by resistance R 1, R2, R3, capacitor C 3, C4, and diode D3, operational amplifier IC2A forms; The voltage reference circuit unit is by resistance R 4, R5, R6, R7, capacitor C 5, and diode D4 forms; The voltage comparator circuit unit is by operational amplifier IC2B, and diode D5 and resistance R 11, R12 form; The current foldback circuit unit is by resistance R 8, R9, R10, capacitor C 6, C7, and NPN type triode Q2, positive-negative-positive triode Q3 forms; The zero cross signal circuit unit is by resistance R 13, R14, R15, R16, R17, and NPN type triode Q4 forms; Zero ON-OFF control circuit unit is by resistance R 22, and diode D10 and D flip-flop IC1 form; The pulsewidth of alternating current zero crossing switch forms circuit unit by resistance R 18, R19, R20, R21, capacitor C 8, C9, and diode D7, D8, D9, D flip-flop IC1 forms.
Circuit working principle embodiment illustrated in fig. 5 is following: the input current that the current detection circuit unit in the controlled alternating current switching circuit detects the power consumption equipment of connecting with this element circuit changes; The reference voltage of the in-phase end of the operational amplifier IC2B of input voltage comparison circuit unit and voltage reference circuit unit relatively after the current amplification circuit unit amplifies; The output voltage of voltage comparator circuit unit is input to the D2 end of the D flip-flop in the zero ON-OFF control circuit unit; The clock signal input CLK2 termination of the D flip-flop in the zero ON-OFF control circuit unit receives the alternating current zero crossing signal from the zero cross signal circuit unit, makes any incoming level of trigger D2 end only just can appear at the output Q2 end of zero ON-OFF control circuit unit in the moment of alternating current zero crossing.When power consumption equipment input current hour; The homophase input voltage of operational amplifier IC2B is lower than the voltage of end of oppisite phase; Operational amplifier IC2B output low level; The Q2 end of zero ON-OFF control circuit unit just ac zero-crossing point constantly after output low level, when the power consumption equipment input current arrived to a certain degree greatly, the homophase input voltage of IC2B was higher than the voltage of end of oppisite phase; Operational amplifier IC2B exports high level, and the Q2 end of zero ON-OFF control circuit unit is just exported high level at ac zero-crossing point constantly.Insert by resistance R 18, R19, R20 between the data input D1 end of the D flip-flop in the pulsewidth formation circuit unit of the alternating current zero crossing switch in the controlled alternating current switching circuit and non-1 end of reversed-phase output Q of output Q 1 end; Capacitor C 8; The charging and discharging circuit that diode D7, D8 form; The output positive pulse width of the output Q1 end of D flip-flop was confirmed by the cycle of R20 and C8 and alternating current; The output positive pulse width of output Q1 end is confirmed by R18, R19 and C8; The clock signal of D flip-flop IC1 input CLK1 termination receives the alternating current zero crossing signal from the zero cross signal circuit unit, makes that the pulse of output Q1 end of D flip-flop all is when alternating current zero crossing, to convert positive pulse into or convert negative pulse into.The signal of the pulse signal of the output Q1 end of IC1 and the output Q2 end of IC1 mixes after photoelectrical coupler OP1 isolates output.Current foldback circuit unit monitors in the controlled alternating current switching circuit is from the output voltage of current amplification circuit unit; When reaching set point; Current foldback circuit unit output low level; Make the data input D2 end of D flip-flop be low level, the output Q2 end of D flip-flop also just can be realized overcurrent protection also with regard to output low level.Power circuit unit in the controlled alternating current switching circuit is that the pulsewidth formation circuit unit of current amplification circuit unit, voltage comparator circuit unit, voltage reference circuit unit, zero ON-OFF control circuit unit, zero cross signal circuit unit and alternating current zero crossing switch provides the power supply supply.
Fig. 6 is the second kind of practical implementation circuit diagram that does not comprise the alternating current switching circuit unit of controlled alternating current switching circuit of the present invention.In the controlled alternating current switching circuit of present embodiment, comprise ac input end AC1, ac input end AC2 and external control signal V+ end, V-end and three internal circuit links 1,2,3.Implement circuit composition unit pack and draw together current detection circuit unit, current amplification circuit unit, voltage reference circuit unit, voltage comparator circuit unit, current foldback circuit unit, zero cross signal circuit unit, zero ON-OFF control circuit unit, internal control signal buffer circuit unit, external control signal buffer circuit unit, power circuit unit.Current detection circuit unit in the controlled alternating current switching circuit adopts resistance R 60; Internal control signal buffer circuit unit adopts photoelectrical coupler OP2; The power circuit unit is by capacitor C 18, C19, C20, diode D13, D14, and resistance R 41, NPN type triode Q16, voltage-stabiliser tube ZD4 forms; The current amplification circuit unit is by resistance R 42, R43, R44, capacitor C 21, C22, and diode D15, operational amplifier IC4A forms; The voltage reference circuit unit is by resistance R 45, R46, R47, R48, capacitor C 23, and diode D16 forms; The voltage comparator circuit unit is by operational amplifier IC4B, and diode D17 and resistance R 52, R53 form; The current foldback circuit unit is by resistance R 49, R50, R51, capacitor C 24, C25, and NPN type triode Q17, positive-negative-positive triode Q18 forms; The zero cross signal circuit unit is by resistance R 54, R55, R56, R57, R58, and NPN type triode Q19 forms; Zero ON-OFF control circuit unit is made up of resistance R 59 and D flip-flop IC3; External control signal buffer circuit unit is made up of photoelectrical coupler OP3 and diode D18.
Circuit working principle embodiment illustrated in fig. 6 is following: the operation principle of the current detection circuit unit in the controlled alternating current switching circuit, current amplification circuit unit, voltage comparator circuit unit, voltage reference circuit unit, power circuit unit, current foldback circuit unit is the same with Fig. 3 same functional circuits cell operation principle, repeats no more.Photoelectrical coupler OP3 in the external control signal buffer circuit unit of controlled alternating current switching circuit receives external control signal control; When input V+ end has current direction V-end; The receiving tube of photoelectrical coupler OP3 presents low resistance state, and then high level makes the data input D end of D flip-flop IC3 be high level behind the photoelectric receiving tube of OP3, diode D18, the output Q end output high level of IC3; Make the photoelectric receiving tube of photoelectrical coupler OP2 present low resistance state, be similar to short-circuit condition; When input V+ end did not have current direction V-end, the photoelectric receiving tube of photoelectrical coupler OP2 presented high-resistance state, is similar to open-circuit condition.
Fig. 7 is first kind of practical implementation circuit theory diagrams of the inner alternating current switching circuit unit of controlled alternating current switching circuit of the present invention.In the present embodiment; The alternating current switching circuit unit has output switching terminal K and ac input end AC2 and three internal circuit links 1,2,3 of controlled alternating current switching circuit, and link 1,2,3 is the internal circuit link 1,2,3 of corresponding connection layout 5 respectively.Alternating current switching circuit unit internal circuit comprises bi-directional thyristor switch, drive circuit unit, an alternating-current switch interior power supply circuit unit and a two-way gate-controlled switch circuit unit of control type.Bi-directional thyristor switch adopts bidirectional triode thyristor Q10; Control type two-way gate-controlled switch circuit unit in field is by resistance R 25, and FET Q8, Q9 form; Drive circuit unit is by resistance R 26, R27, R28, R29, R30, R31, R32, capacitor C 13, and NPN triode Q6, Q7, PNP triode Q5 forms; Alternating-current switch interior power supply circuit unit is by resistance R 24, capacitor C 10, C11, C12, and diode D11, voltage-stabiliser tube ZD2, the endobiosis diode of FET Q9 is formed.
Circuit working principle embodiment illustrated in fig. 7 is following: the link 2,3 of alternating current switching circuit unit connects output link 2,3 ends of the photoelectrical coupler OP1 of internal control signal buffer circuit unit respectively; When the output link 2 of OP1, when becoming low resistance between 3; Q5 in the drive circuit unit, Q7 conducting; Then Q6 turn-offs, and drive circuit unit output high level makes a FET Q8 of the two-way gate-controlled switch circuit unit of control type, Q9 conducting simultaneously; This moment, the electric current of FET Q8, Q9 can two-way flow, made that bi-directional thyristor switch also can two-way admittance; When the output link 2 of OP1, when becoming high resistance between 3; Q5 in the drive circuit unit, Q7 turn-off; Then Q6 conducting, the drive circuit unit output low level is turn-offed FET Q8, a Q9 of the two-way gate-controlled switch circuit unit of control type simultaneously; Make bi-directional thyristor switch also turn-off, realize the alternating-current switch function of bidirectional triode thyristor.The operation principle of alternating-current switch interior power supply circuit unit is to exchange positive half cycle through capacitor C 10; Diode D11; Endobiosis diode pair capacitor C 12 chargings of FET Q9 provide the power supply supply to internal circuit simultaneously, and negative half period is then through capacitor C 10, C11; Voltage-stabiliser tube ZD2, resistance R 24 afterflows.
Fig. 8 is second kind of practical implementation circuit theory diagrams of the inner alternating current switching circuit unit of controlled alternating current switching circuit of the present invention.In the present embodiment; The alternating current switching circuit unit has output switching terminal K and ac input end AC2 and three internal circuit links 1,2,3 of controlled alternating current switching circuit, the internal circuit link 1,2,3 of 1,2,3 corresponding connection layouts 6 of difference of link equally.Alternating current switching circuit unit internal circuit then comprises drive circuit unit, an alternating-current switch interior power supply circuit unit and a two-way gate-controlled switch circuit unit of control type.Control type two-way gate-controlled switch circuit unit in field is made up of FET Q14, Q15; Drive circuit unit is by resistance R 34, R35, R36, R37, R38, R39, R40, capacitor C 17, and NPN triode Q12, Q13, PNP triode Q11 forms; Alternating-current switch interior power supply circuit unit is by resistance R 33, capacitor C 14, C15, C16, and diode D12, voltage-stabiliser tube ZD3, the endobiosis diode of FET Q15 is formed.
What circuit working principle embodiment illustrated in fig. 8 was different with Fig. 7 is that the alternating-current switch function is directly born by the two-way gate-controlled switch circuit of field control type; Saved bidirectional triode thyristor; Switching speed is faster; Do not have the current tail phenomenon, be more suitable for appearing the alternating-current switch of power consumption equipments such as inductive transformer, motor as input.
Need to prove; Above-mentioned execution mode is merely the preferable embodiment of the present invention; Can not it be interpreted as the restriction to protection range of the present invention, conceive under the prerequisite not breaking away from the present invention that any impartial the variation with modifying all belonged to this protection scope of the present invention to the present invention does.
Claims (8)
1. a controlled alternating current switching circuit comprises alternating current switching circuit unit, current detection circuit unit, current amplification circuit unit, voltage reference circuit unit, voltage comparator circuit unit, zero cross signal circuit unit, zero ON-OFF control circuit unit, internal control signal buffer circuit unit at least; It is characterized in that: said alternating current switching circuit unit has output switching terminal K, and said alternating current switching circuit unit and current detection circuit units in series are between ac input end AC2, AC1; Said current detection circuit unit detects the electric current of the reflection power consumption equipment operating state that flows through the alternating current switching circuit unit;, the current amplification circuit unit exports to voltage comparison unit after amplifying; With the reference voltage of voltage reference circuit unit output relatively after, the output signal is as one road input signal of zero ON-OFF control circuit unit; The pulsewidth of said zero cross signal circuit unit, alternating current zero crossing switch forms the in addition two-way input signal of circuit unit as zero ON-OFF control circuit unit, and three road signals are exported to internal control signal buffer circuit cell isolation and driven alternating current switching circuit unit inner alternating-current switch conducting and disconnection after zero ON-OFF control circuit cell processing.
2. a controlled alternating current switching circuit comprises alternating current switching circuit unit, current detection circuit unit, current amplification circuit unit, voltage reference circuit unit, voltage comparator circuit unit, zero cross signal circuit unit, zero ON-OFF control circuit unit, internal control signal buffer circuit unit at least; It is characterized in that: said alternating current switching circuit unit has output switching terminal K, and said alternating current switching circuit unit and current detection circuit units in series are between ac input end AC2, AC1; Said current detection circuit unit detects the electric current of the reflection power consumption equipment operating state that flows through the alternating current switching circuit unit;, the current amplification circuit unit exports to voltage comparison unit after amplifying; With by the reference voltage of voltage reference circuit unit output relatively after, the output signal is as one road input signal of zero ON-OFF control circuit unit; The two-way input signal in addition of said zero cross signal circuit unit, external control signal buffer circuit unit conduct zero ON-OFF control circuit unit, three road signals are exported to alternating-current switch conducting and the disconnection that internal control signal buffer circuit cell isolation drives inside, alternating current switching circuit unit after zero ON-OFF control circuit cell processing.
3. controlled alternating current switching circuit according to claim 1 and 2 is characterized in that: comprise that further the overcurrent that is used to realize power consumption equipment or power supply, the current foldback circuit unit of short-circuit protection function reach the power circuit unit that power supply is provided for each functional circuit.
4. controlled alternating current switching circuit according to claim 3; It is characterized in that: said alternating current switching circuit unit comprises the alternating-current switch interior power supply circuit unit that is connected with ac input end AC2; Drive circuit unit; The two-way gate-controlled switch circuit unit of field control type that one end is connected with drive circuit unit, the other end is connected with output switching terminal K, said drive circuit unit connects internal control signal buffer circuit unit.
5. controlled alternating current switching circuit according to claim 4 is characterized in that: said alternating current switching circuit unit further comprises bi-directional thyristor switch, and it is connected between two-way gate-controlled switch circuit unit of a control type and the output switching terminal K.
6. controlled alternating current switching circuit according to claim 5; It is characterized in that: said the two-way gate-controlled switch circuit unit of control type comprises FET QA, QB, and the source electrode of FET QA, QB, grid link together as new source electrode, a grid of the two-way gate-controlled switch device of control type; The drain electrode of two FETs is respectively as the first output switching terminal K1 and a second switch output K2 of the two-way gate-controlled switch device of control type.
7. controlled alternating current switching circuit according to claim 5 is characterized in that: in the said alternating current switching circuit unit:
Drive circuit unit comprises triode Q5, Q6, Q7;
Alternating-current switch interior power supply circuit unit comprises resistance R 24, capacitor C 10, C11, C12, diode D11, voltage-stabiliser tube ZD2;
Bidirectional triode thyristor Q10 is as bi-directional thyristor switch;
Control type two-way gate-controlled switch circuit unit in field comprises resistance R 25, FET Q8, Q9;
Said alternating current switching circuit unit link (2,3) receives internal control signal buffer circuit cell signal respectively; When internal control signal buffer circuit unit output low resistance; Then triode Q5, Q7 conducting; Q6 turn-offs, and drive circuit unit output high level makes a FET Q8 of the two-way gate-controlled switch circuit unit of control type, Q9 conducting simultaneously, and then makes bi-directional thyristor switch Q10 two-way admittance; When internal control signal buffer circuit unit output high resistance; Triode Q5 in the drive circuit unit, Q7 turn-off, the Q6 conducting; The drive circuit unit output low level is turn-offed FET Q8, a Q9 of the two-way gate-controlled switch circuit unit of control type simultaneously; And then Q10 is turn-offed, realize the alternating-current switch function of bidirectional triode thyristor.
8. controlled alternating current switching circuit according to claim 4 is characterized in that: in the said alternating current switching circuit unit:
Control type two-way gate-controlled switch circuit unit in field comprises FET Q14, Q15;
Drive circuit unit comprises resistance R 34, R35, R36, R37, R38, R39, R40, capacitor C 17, triode Q11, Q12, Q13;
Alternating-current switch interior power supply circuit unit comprises resistance R 33, capacitor C 14, C15, C16, diode D12, voltage-stabiliser tube ZD3;
Said alternating current switching circuit unit link (2,3) receives internal control signal buffer circuit cell signal respectively; When internal control signal buffer circuit unit output low resistance, then triode Q11, Q13 conducting, Q12 turn-offs, and drive circuit unit output high level makes a FET Q14 of the two-way gate-controlled switch circuit unit of control type, Q15 conducting simultaneously; When internal control signal buffer circuit unit output high resistance; Triode Q11 in the drive circuit unit, Q13 turn-off, the Q12 conducting; The drive circuit unit output low level is turn-offed FET Q14, a Q15 of the two-way gate-controlled switch circuit unit of control type simultaneously, realizes the alternating-current switch function of bidirectional triode thyristor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010285299 CN102006042B (en) | 2010-09-15 | 2010-09-15 | Controllable alternating current switching circuit |
Applications Claiming Priority (1)
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| CN 201010285299 CN102006042B (en) | 2010-09-15 | 2010-09-15 | Controllable alternating current switching circuit |
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| CN103149861B (en) * | 2013-02-05 | 2015-08-05 | 广州森下电装科技有限公司 | Dirty device is inhaled in a kind of water treatment |
| CN105929217B (en) * | 2016-05-12 | 2019-01-08 | 国电南瑞科技股份有限公司 | A kind of failure protection current tail method of discrimination based on DC component locking |
| CN108710398A (en) * | 2018-06-25 | 2018-10-26 | 广州金升阳科技有限公司 | A kind of isolation control circuit |
| EP4254802A4 (en) * | 2020-12-28 | 2024-01-17 | Suteng Innovation Tech Co Ltd | Laser receiving circuit and laser radar |
| CN112886800A (en) * | 2020-12-31 | 2021-06-01 | 江苏东方四通科技股份有限公司 | Power controller with automatic current-limiting protection function |
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| US4773081A (en) * | 1986-09-11 | 1988-09-20 | Nec Corporation | Channel switching system |
| CN201536195U (en) * | 2009-07-27 | 2010-07-28 | 陈清尧 | Energy-saving socket for home appliances in standby state |
| CN201860307U (en) * | 2010-09-15 | 2011-06-08 | 天宝电子（惠州）有限公司 | Controllable AC switching circuit |
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| US7667443B2 (en) * | 2005-10-11 | 2010-02-23 | Active-Semi, Inc. | System and method for near zero light-load supply current in switching regulator |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4773081A (en) * | 1986-09-11 | 1988-09-20 | Nec Corporation | Channel switching system |
| CN201536195U (en) * | 2009-07-27 | 2010-07-28 | 陈清尧 | Energy-saving socket for home appliances in standby state |
| CN201860307U (en) * | 2010-09-15 | 2011-06-08 | 天宝电子（惠州）有限公司 | Controllable AC switching circuit |
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