CN105208707A - Control method suitable for bidirectional thyristor switch element dimming and power converter - Google Patents
Control method suitable for bidirectional thyristor switch element dimming and power converter Download PDFInfo
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- CN105208707A CN105208707A CN201410273000.9A CN201410273000A CN105208707A CN 105208707 A CN105208707 A CN 105208707A CN 201410273000 A CN201410273000 A CN 201410273000A CN 105208707 A CN105208707 A CN 105208707A
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Abstract
The present invention provides a control method for a power controller powered by an operation power supply. The power controller comprises a high-voltage transistor which is electrically connected between the operation power supply and an input power supply. The control method comprises a step of detecting the operation voltage of the operation power supply, a step of controlling the high-voltage transistor to draw conduction current from the input power supply, a step of transmitting the conduction current to the operation power supply when the operation voltage is lower than a preset value so as to change the operation power supply, a step of providing detection voltage which can represents the input voltage of the input power supply, a step of comparing the detection voltage and a second preset value, and a step of transmitting the conduction current to a ground line and not charging the operation power supply when the detection voltage is lower than the second preset value.
Description
Technical field
The present invention relates generally to the power control method of a kind of bi-directional thyristor switch element (TRIAC) and relevant device, is espespecially the control method of the maintenance electric current produced needed for TRIAC.
Background technology
TRIAC dimmer is for resistive load (resistiveload), be such as designed by incandescent tungsten lamp (incandescent) or Halogen lamp LED (halogen), and be used in a large number in all parts of the world.Very unfortunate, the dimmer of this phase control might not be applicable to the LED in the present age, because the not resistive load of LED performance.Therefore, the power supply unit of driving LED, just needs special specification, just can support TRIAC dimmer.
TRIAC dimmer, by stopping or cut away the ac power waveform of part, reaches and reduces institute's transmitting energy.So TRIAC dimmer excises dimmer (phasecutdimmer) also referred to as phase place.Fig. 1 and Fig. 2 shows the waveform that a kind of leading edge trigger-type (leadingedge) and trailing edge trigger-type (trailingedge) TRIAC dimmer produce respectively.Waveform 100 represents the voltage waveform of interchange (alternativecurrent, the AC) power supply of civil power, and dash area 110 represents the part being transferred to load in waveform 100.The time of the ac power waveform 100 that TRIAC dimmer cuts away, hereinafter referred to as deadline (cutofftime) T
cUTOFF; At All Other Times, namely the voltage of AC power supplies is almost completely by the time of TRIAC dimmer, be then called ON time (conductiontime) T
cONDUCTION.
Although at T deadline
cUTOFFin, the cross-pressure in load is almost 0V, but load still needs to draw at least a certain amount of electric current, maintains TRIAC dimmer at T deadline
cUTOFFinterior normal operation.Such electric current, industry is called maintenance electric current (holdingcurrent), and it along with different TRIAC dimmers, and can have different specifications.
When load is LED illumination, how at T deadline
cUTOFFin, stable provides maintenance electric current, allows TRIAC dimmer can normal running, just becomes the target that industry is made great efforts.
Summary of the invention
The invention provides a kind of control method, be applicable to power-supply controller of electric, it can be powered by operating power.This power-supply controller of electric includes high voltage transistor, is electrically connected between this operating power and input power.This control method includes: the operating voltage detecting this operating power; Control this high voltage transistor, to draw On current from this input power; When this operating voltage is lower than the first preset value, this On current is conducted to this operating power, to charge to this operating power; There is provided detection voltage, it can represent the input voltage of this input power; Relatively this detection voltage and the second preset value; And, when this detection voltage is lower than this second preset value, this On current is conducted to earth connection, and this operating power is not charged.
The invention provides a kind of power supply changeover device, for by input power, be converted to out-put supply, this power supply changeover device includes power-supply controller of electric, powered by operating power.This power-supply controller of electric include high pressure pin, high voltage transistor, high voltage startup control circuit and deadline testing circuit.This high voltage transistor, from this input power, by this high pressure pin, can draw On current.This high voltage startup control circuit detects this operating voltage, and when this operating voltage is lower than the first preset value, this On current is conducted to this operating power, to charge to this operating power.This, testing circuit detected the input voltage of this input power deadline, and when this input voltage is lower than the second preset value, this On current was conducted to earth connection, and does not charge to this operating power.
Accompanying drawing explanation
Fig. 1 and Fig. 2 shows the waveform that a kind of leading edge trigger-type and trailing edge trigger-type TRIAC dimmer produce respectively.
Fig. 3 shows the power supply changeover device 900 implemented according to the present invention.
Fig. 4 shows the circuit that some are relevant to high pressure pin HV.
Fig. 5 shows another power supply changeover device 600 implemented according to the present invention.
Reference numeral explanation
100 waveforms
110 dash areas
600 power supply changeover devices
602TRIAC dimmer
604 bridge rectifiers
606 transformers
608 power-supply controller of electric
610 power switchs
612 loads
614 current-limiting resistances
616 discharge circuits
618BJT transistor
619 resistance
620 resistance
621 resistance
802 high pressure regulators
804 high voltage transistors
806 resistance detectors
807 divider resistances
808 phase detectors
809 divider resistances
810 transmitting switches
900 power supply changeover devices
AUX assists winding
DRV drives pin
EN enable signal
HV high pressure pin
I
ccollector current
I
cONon current
I
pRMmain winding current
LINE power line
PRM main winding
SEC secondary winding
T
cONDUCTIONoN time
T
cUTOFFdeadline
V
aCelectric main
V
cCoperating power
V
dRVpwm signal
V
jOINTjunction voltage
V
lINEaC line power supply
V
sETsetting signal
V-
tRIACalternating current input power supplying
V
tRIAC-PEAKpeak value
ZCD zero current detection pin
Embodiment
In this manual, have the symbol that some are identical, it represents to have the element of identical or similar structure, function, principle, and can know by inference according to the instruction of this specification for those skilled in the art.For the succinct degree of specification is considered, the element of identical symbol will no longer repeat.
There is provided power supply changeover device in an embodiment of the present invention, it is controlled by power-supply controller of electric, is used for changing input power, and produces out-put supply.Electric main, after the process of TRIAC dimmer, produces this input power.This power-supply controller of electric has high voltage startup mechanism, with built-in high voltage transistor, when starting shooting, directly from this input power, can draw On current, setting up operating power, powering to this power-supply controller of electric.This power-supply controller of electric can detect the input voltage of input power.When this input voltage is on the low side, can judges that TRIAC dimmer blocks the waveform of electric main, now should be T deadline
cUTOFF, therefore make this On current no longer to operating power charging, but be directly released into earth connection.Just possibility can as T deadline for this On current
cUTOFFin required maintenance electric current, allow the normal running of TRIAC dimmer.
When the maintenance electric current needed for TRIAC dimmer is greater than the On current that high voltage transistor can provide, embodiments of the invention provide discharge circuit in addition outside this power-supply controller of electric.When this On current occurs, this discharge circuit can be triggered, and provides the discharging current flowing to this earth connection from this input power.This On current, can as T deadline together with discharging current
cUTOFFinterior required maintenance electric current.
Fig. 3 shows the power supply changeover device 900 implemented according to the present invention.Although power supply changeover device 900 has flyback framework, the present invention is not limited thereto.For example, the present invention also can be implemented on step-down controller, boost converter, type of voltage step-up/down converter etc.
In embodiment in Fig. 3, the electric main V that indoor socket comes
aCcan be 100VAC, 110VAC or 220VAC, its frequency may be 50Hz or 60Hz.TRIAC dimmer 602 can excise electric main V
aCin portion waveshape, and produce alternating current input power supplying V
tRIAC.For example, electric main V
aCfor the waveform 100 in Fig. 1 and Fig. 2, and alternating current input power supplying V
tRIACit is the part shown in dash area 110.Bridge rectifier 604 couples of alternating current input power supplying V
tRIACfull-wave rectification is provided, and on power line LINE, provides AC line power supply V
lINE, and earth connection is provided.
Transformer 606 has main winding PRM, secondary winding SEC and auxiliary winding AUX.In an embodiment, power-supply controller of electric 608 is pulse width modulation (pulse-widthmodulation, PWM) controllers, is made up of single-chip.In normal power supply program, power-supply controller of electric 608 can provide pwm signal V on driving pin DRV
dRV, by switch power switch 610, carry out the main winding current I of control flow check through main winding PRM
pRM.Power switch 610 can the energy storage of control transformer 606 or exoergic.When exoergic, the electric current that secondary winding SEC discharges, can set up out-put supply V
oUT, load 612 is powered.Meanwhile, the electric current that auxiliary winding AUX discharges, can set up operating power V
cC, power-supply controller of electric 608 is powered.
Power-supply controller of electric 608 has zero current detection pin ZCD.When power switch 610 conducting, zero current detection pin ZCD flow out to the electric current of auxiliary winding AUX, can approximately and AC line power supply V
lINEline voltage in proportion.In an embodiment, line voltage is approximately alternating current input power supplying V
tRIACpeak value V
tRIAC-PEAK.Therefore, power-supply controller of electric 608 is by zero current detection pin ZCD, detection peak V
tRIAC-PEAK.When auxiliary winding AUX exoergic, the voltage of zero current detection pin ZCD approximately and out-put supply V
oUToutput voltage proportional.In an embodiment, power-supply controller of electric 608, by zero current detection pin ZCD, can detect out-put supply V
oUToutput voltage and/or to detect the exoergic of auxiliary winding AUX complete.
Power-supply controller of electric 608 has high pressure pin HV.Be serially connected with high pressure pin HV and alternating current input power supplying V
tRIACbetween have two rectifier diodes and current-limiting resistance 614.In starting up's program, operating power V
cCoperating voltage also too low time, power-supply controller of electric 608, can pass through high pressure pin HV and current-limiting resistance 614, from alternating current input power supplying V
tRIACdraw On current I
cON, come operating power V
cCcharging, to draw high operating voltage.Such charging process, under operating voltage is more than one in limited time, just can stops, also can finish starting up's program simultaneously, enter normal power supply program.Afterwards, operating power V
cCoperating voltage maintain, just can be completed by the exoergic of auxiliary winding AUX.In starting up's program, pwm signal V
dRVcontinue to close power switch 610.
In starting up's program, resistance detector 806 can release preset current from zero current detection pin ZCD, now detects the tie point voltage in the middle of resistance 619 and 621, the approximately corresponding parallel resistance value detecting resistance 619 and 621.According to this tie point voltage, resistance detector 806 can produce relative record, and in normal power supply program, provides setting signal V according to this
sET.In normal power supply program, by high pressure pin HV, power-supply controller of electric 608 can detect current alternating current input power supplying V
tRIACabsolute value.If alternating current input power supplying V
tRIACabsolute value on the low side, for example lower than setting signal V
sET, can judge that TRIAC dimmer 602 blocks electric main V
aCwaveform, now should be T deadline
cUTOFF.Therefore, power-supply controller of electric 608 equally passes through high pressure pin HV, current-limiting resistance 614 and two rectifier diodes, from alternating current input power supplying V
tRIACdraw On current I
cON.But now On current I
cONnot to operating power V
cCcharging, but be discharged into earth connection.So, On current I
cONt deadline can be maintained as TRIAC dimmer 602
cUTOFFrequired maintenance electric current.
The parallel resistance value of resistance 619 and 621 can determine setting signal V
sET, the equivalent power-supply controller of electric 608 that determines is used for distinguishing T deadline
cUTOFFwith ON time T
cONDUCTIONpreset value.
Can optionally include discharge circuit 616 in Fig. 3, higher maintenance electric current can be provided.Discharge circuit 616 includes BJT transistor 618 and resistance 620.The base stage of BJT transistor 618 and emitter are connected respectively to high pressure pin HV and alternating current input power supplying V
tRIAC, the collector electrode of BJT transistor 618, then by resistance 620, is connected to earth connection.As On current I
cONduring appearance, by the Current amplifier effect of BJT transistor 618, BJT transistor 618 can produce collector current I
c, namely a kind of discharging current.On current I
cONwith collector current I
ctogether can as maintenance electric current.As On current I
cONwhen being 0, BJT transistor 618 is closed, so collector current I
calso be 0, therefore, maintain current supplying circuit 616 and present high impedance, isolated alternating current input power supplying V
tRIACwith earth connection.
Fig. 4 shows the circuit that some are relevant to high pressure pin HV.High pressure regulator (regulator) 802, as high voltage startup control circuit, detects operating power V
cC, and control high voltage transistor 804 according to this, to determine whether provide On current I
cON.High voltage transistor 804 can be considered controllable current source, and it must have the high voltage of more than 240V by withstand high pressures pin HV.For example, as operating power V
cCoperating voltage lower than 10V time, high voltage transistor 804 is unlocked, On current I
cONbe 4 microamperes (mA); As operating power V
cCoperating voltage higher than 16V time, high voltage transistor 804 is closed, On current I
cONbe 0 microampere (mA).
Resistance detector 806, by zero current detection pin ZCD, in starting up's program, detects the tie point voltage of resistance 619 and 621, to produce setting signal V
sET.In normal power supply program, the junction voltage V between divider resistance 807 and 809
jOINT, approximately with current alternating current input power supplying V
tRIACabsolute value proportional.Phase detectors 808 compare setting signal V
sETwith junction voltage V
jOINT, differentiate currently whether belong to T deadline
cUTOFF.For example, as junction voltage V
jOINThigher than setting signal V
sETtime, assert and be now positioned at ON time T
cONDUCTIONin, so phase detectors 808 are with enable signal EN, controls transfer switch 810, guides any possible On current I
cON, to operating power V
cCcharging.As junction voltage V
jOINTlower than setting signal V
sETtime, assert and be now positioned at T deadline
cUTOFFin, phase detectors 808 make high voltage transistor 804 produce On current I
cON, and make transmitting switch 810, guiding On current I
cONto earth connection.Therefore, divider resistance 807 and 809, and phase detectors 808, can be considered as testing circuit deadline together.
In this embodiment, high voltage transistor 804 can play the part of two functions, one when being to provide starting up's program, to operating power V
cCcharging current; Another is at T deadline
cUTOFFin, the electric current of the maintenance needed for TRIAC dimmer 602 is provided.
In an embodiment, only assert that current is T deadline at phase detectors 808
cUTOFF, or operating power V
cCoperating voltage lower than 16V time, high voltage transistor 804 just may provide the On current I of 4mA
cON.Otherwise, On current I
cONbe all 0.
Fig. 5 shows another power supply changeover device 600 implemented according to the present invention.Power supply changeover device 900 with Fig. 3 is different, and the current-limiting resistance 614 in power supply changeover device 600 and discharge circuit 616 are connected to AC line power supply V
lINE.In this embodiment, AC line power supply V
lINEline voltage preferably can follow alternating current input power supplying V fast
tRIACcurrent absolute value.The operating principle of power supply changeover device 600 can be learnt with reference to the power supply changeover device 900 of figure 3 and related description, for for purpose of brevity, no longer repeats.
The foregoing is only the preferred embodiments of the present invention, every equalization done according to claim of the present invention changes and modifies, and all should belong to protection scope of the present invention.
Claims (13)
1. a control method, is applicable to a power-supply controller of electric, and it can be powered by an operating power, and this power-supply controller of electric includes a high voltage transistor, and be electrically connected between this operating power and an input power, this control method includes:
Detect an operating voltage of this operating power;
Control this high voltage transistor, to draw an On current from this input power;
When this operating voltage is lower than first preset value, this On current is conducted to this operating power, to charge to this operating power;
There is provided a detection voltage, it can represent an input voltage of this input power;
Relatively this detection voltage and one second preset value; And
When this detection voltage is lower than this second preset value, this On current is conducted to an earth connection, and this operating power is not charged.
2., according to control method according to claim 1, also include:
One transformer is provided, there is a main winding, a secondary side winding and an auxiliary winding;
This main winding of electric coupling is to this input power;
With two resistance and this auxiliary winding parallel of connecting; And
According to a tie point voltage of this series connection two resistance, produce this second preset value.
3. according to control method according to claim 2, wherein, this power-supply controller of electric is a Pwm controller, can produce a pulse width modulating signal, in order to the main winding current of control flow check through this main winding.
4., according to control method according to claim 1, also include:
When this On current occurs, produce the discharging current being greater than this On current, flow to this ground from this input power.
5. according to control method according to claim 4, wherein, this discharging current controlled by a bipolar transistor, and this On current flows through a base stage of this bipolar transistor.
6. a power supply changeover device, for by an input power, be converted to an out-put supply, this power supply changeover device includes:
One power-supply controller of electric, powered by an operating power, included:
One high pressure pin;
One high voltage transistor, can draw an On current from this input power by this high pressure pin;
One high voltage startup control circuit, detects this operating voltage, and when this operating voltage is lower than first preset value, this On current is conducted to this operating power, to charge to this operating power; And
One deadline testing circuit, for detecting an input voltage of this input power, and when this input voltage is lower than second preset value, this On current is conducted to an earth connection, and this operating power is not charged.
7. according to power supply changeover device according to claim 6, wherein, this, testing circuit included two divider resistances deadline, was series between this high pressure pin and this earth connection.
8., according to power supply changeover device according to claim 6, also include:
One transformer, has a main winding, a secondary side winding and an auxiliary winding; And
Two series resistances, are parallel to this auxiliary winding, have a series connection tie point;
This resistance detector also includes a resistance detector, is connected to this and is connected in series a little, is used to provide this second preset value.
9. according to power supply changeover device according to claim 8, wherein, this power-supply controller of electric is a Pwm controller, can produce a pulse width modulating signal, for the main winding current of control flow check through this main winding.
10. according to power supply changeover device according to claim 8, wherein, this input power is an alternating current input power supplying, and this power supply changeover device also includes:
One bridge rectifier, for being an AC line power supply by this input power rectification, is connected to this main winding.
11., according to power supply changeover device according to claim 6, also include:
One current-limiting resistance, is connected between this input power and this high voltage transistor.
12., according to power supply changeover device according to claim 11, also include:
One bipolar transistor, has an emitter, a base stage and a collector electrode;
Wherein, this base stage and this collector electrode are connected to the two ends of this current-limiting resistance respectively; And
This collector electrode is electrically coupled to this ground.
13., according to power supply changeover device according to claim 6, also include:
One bi-directional thyristor switch element, is connected to an electric main, for generation of this input power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410273000.9A CN105208707B (en) | 2014-06-18 | 2014-06-18 | Control method and power supply changeover device suitable for bi-directional thyristor switch element light modulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410273000.9A CN105208707B (en) | 2014-06-18 | 2014-06-18 | Control method and power supply changeover device suitable for bi-directional thyristor switch element light modulation |
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| Publication Number | Publication Date |
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| CN105208707A true CN105208707A (en) | 2015-12-30 |
| CN105208707B CN105208707B (en) | 2018-10-26 |
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| CN201410273000.9A Active CN105208707B (en) | 2014-06-18 | 2014-06-18 | Control method and power supply changeover device suitable for bi-directional thyristor switch element light modulation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20190008535A1 (en) * | 2017-07-04 | 2019-01-10 | Richard Wolf Gmbh | Sound wave treatment device |
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| Publication number | Publication date |
|---|---|
| CN105208707B (en) | 2018-10-26 |
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