CN108207053A - driving circuit - Google Patents
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- CN108207053A CN108207053A CN201611168585.3A CN201611168585A CN108207053A CN 108207053 A CN108207053 A CN 108207053A CN 201611168585 A CN201611168585 A CN 201611168585A CN 108207053 A CN108207053 A CN 108207053A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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Abstract
Embodiment of the disclosure is related to driving circuit.The driving circuit includes：Transformer, transformer include the first coil, the second coil and the tertiary coil that are magnetically coupling to one another, and first coil is coupled to DC source, and the second coil is loaded coupled to constant-current type；And accumulator, coupled to transformer.In addition, the driving circuit further includes controller, coupled to accumulator, and it is configured so that the power transmission from DC source to accumulator during first time period via the first coil of transformer and tertiary coil, power is transmitted to constant-current type from accumulator via the first coil of transformer and the second coil during second time period loads.
Description
Technical field
Embodiment of the disclosure relates in general to driving circuit, and in particular to for being born by the constant-current type that pulse current operates
The driving circuit of load.
Background technology
Constant-current type load (such as LED flash) most of the time operated by pulse current is in off position,
Do not consume energy；But it needs to consume big energy within the short time of operation.Thus while the mean power consumed is very
It is small, but such constant-current type load requirement prime supplying DC source has higher capacity, to ensure that DC source is had the ability wink
When export it is high-power, without trigger DC source overcurrent protection.However, load idle phase period in constant-current type
Between, the high power capacity of DC source is waste.
To reduce the capacity requirement to DC source, the side for increasing energy-storage capacitor and additional charging circuit can be taken
Method.This can increase the complexity, occupied space and production cost of circuit.
Invention content
In order to solve the problems, such as that above-mentioned and other are potential at least partly, embodiment of the disclosure provides driving electricity
Road.
Embodiment of the disclosure provides a kind of driving circuit, which includes：Transformer, including being magnetically coupling to one another
First coil, the second coil and tertiary coil, first coil be coupled to DC source, the second coil coupled to constant-current type load；
Accumulator, coupled to transformer；And controller, coupled to accumulator, and it is configured so that during first time period
Via the first coil and tertiary coil of transformer by the power transmission from DC source to accumulator, during second time period
Power is transmitted to constant-current type from accumulator via the first coil and the second coil of transformer to load.
In some embodiments, driving circuit further includes：First switch is coupling in the tertiary coil of accumulator and transformer
Between；And second switch, it is coupling between accumulator and the first coil of transformer；Wherein during first time period, control
Device processed is configured so that first switch is closed and second switch disconnects, and during second time period, controller by with
It is set to so that first switch disconnects and second switch is closed.
In some embodiments, driving circuit further includes：Third switchs, and is coupling in the second coil and constant-current type of transformer
Between load, the conducting state of third switch is consistent with the conducting state of second switch.
In some embodiments, controller includes：Detection unit is configured to the voltage of detection accumulator；And control
Signal generator is configured to based on the voltage detected by detection unit, generation for first switch first control signal and
For the second control signal of second switch.
In some embodiments, first threshold is decreased below in response to the voltage of accumulator, first control signal causes
First switch is closed, and second control signal causes second switch to disconnect；It is and supreme in response to the voltage raising of accumulator
In second threshold, first control signal causes first switch to disconnect, and second control signal causes second switch to be closed；Wherein
Second threshold is higher than first threshold.
In some embodiments, driving circuit further includes：First current feedback channel is configured to provide instruction from transformation
The tertiary coil of device flow to the signal of the charging current of accumulator, for setting the steady state value of charging current；And second
Current feedback channel is configured to provide the signal for induced current that constant-current type load is flowed through in instruction, for setting supply electricity
The steady state value of stream；Wherein the steady state value of charging current is less than the steady state value for induced current.
In some embodiments, first threshold is decreased below in response to the voltage of accumulator, first control signal enables
First current feedback channel, and second control signal disables the second current feedback channel；And the voltage in response to accumulator
Second threshold is increased above, first control signal disables the first current feedback channel, and second control signal enables second
Current feedback channel.
In some embodiments, driving circuit further includes：Diode, be coupling in DC source and transformer first coil it
Between, and it is configured to be blocked in the electric current slave accumulator to DC source during second time period.
In some embodiments, constant-current type load is LED flash.
In some embodiments, driving circuit is inverse-excitation type constant-current drive circuit.
It will be understood that by being described below, the advantage of embodiment of the disclosure is, by being fitted to existing driving circuit
Work as improvement, the function of charging circuit can be realized using driving circuit in a simple manner, without increasing additional charging
Circuit, thus reduce the complexity, occupied space and production cost of circuit.Embodiment of the disclosure can be in first time period
Period is stored the power from DC source to accumulator with low current, and during second time period with load needed for it is big
Electric current is powered load by accumulator, so as to which that DC source is not required instantaneously to export is high-power, because without caused by direct current
The waste of source capacity.
It is their below specific in order to introduce the selection to concept in simplified form to provide Summary
It will be further described in embodiment.Summary be not intended to identify the disclosure key feature or main feature, also without
Meaning limitation the scope of the present disclosure.
Description of the drawings
Disclosure exemplary embodiment is described in more detail in conjunction with the accompanying drawings, the disclosure it is above-mentioned and other
Purpose, feature and advantage will be apparent, wherein in disclosure exemplary embodiment, identical reference label usual generation
Table same parts.
Fig. 1 shows the schematic diagram of the power supply circuit of the driving circuit including the prior art；
Fig. 2 shows the schematic diagrames of the power supply circuit for the driving circuit combined with charging circuit for including the prior art；
Fig. 3 shows the schematic diagram of the power supply circuit including driving circuit according to an embodiment of the present disclosure；And
The circuit diagram of the power supply circuit including example driving circuit according to an embodiment of the present disclosure is shown in detail in Fig. 4.
Specific embodiment
Preferred embodiment of the present disclosure is more fully described below with reference to accompanying drawings.Although the disclosure is shown in attached drawing
Preferred embodiment, however, it is to be appreciated that may be realized in various forms the disclosure without should be limited by embodiments set forth here
System.On the contrary, these embodiments are provided so that the disclosure is more thorough and complete, and can be complete by the scope of the present disclosure
Ground is communicated to those skilled in the art.
Terminology used in this article " comprising " and its deformation represent that opening includes, i.e., " include but not limited to ".Unless
Especially statement, term "or" represent "and/or".Term "based" represents " being based at least partially on ".Term " implemented by an example
Example " and " one embodiment " expression " at least one example embodiment ".Term " another embodiment " expression is " at least one other
Embodiment ".Term " first ", " second " etc. may refer to different or identical objects.Hereafter it is also possible that other are bright
True and implicit definition.
The constant-current type load (such as LED flash) operated by pulse current needs constant-current drive circuit to provide work(
Rate, to obtain stable lumen during shining, and avoid the occurrence of the high peak current that load life is caused to shorten.For this
The low-power constant-current drive circuit of kind load is normally based on inverse-excitation type (flyback) topological structure.
Fig. 1 shows the schematic diagram of the power supply circuit 100 of the driving circuit 110 including the prior art.Confession shown in Fig. 1
In circuit 100, driving circuit 110 obtains power, and the power of acquisition is provided to constant-current type load from DC source 120
130.For example, constant-current type load 130 can be LED flash, it particularly, being connected in series with for multiple LED.Driving circuit
110 mainly include transformer T and driver 112.Driving circuit 110 also typically includes what is be connected in parallel with constant-current type load 130
Output capacitor 116.The first coil Coil1 of transformer T is configured to receive the power from DC source 120.Transformer T's
Second coil Coil2 is configured as that power is provided to constant-current type load 130 via output diode 114.Driver 112 by with
It is set to so that storing energy in first coil Coil1 during the period 1, and cause energy during second round
130 release of load from the second coil Coil2 to constant-current type.Particularly, driver 112 and transformer T can be inverse-excitation type constant currents
A part for driving circuit.Driver 112 receives the DC feedback signal that the electric current of constant-current type load 130 is flowed through in instruction, and
The value of electric current supplied to constant-current type load 130 is set based on the DC feedback signal.
Constant-current type 130 mosts of the time of load operated by pulse current are in off position, do not consume energy；
But it needs to consume big energy within the short time of operation.Thus while mean power very little, but for supplying power
Driving circuit 110 must have the ability of the stable high current of instantaneous output, to provide big supply electricity when LED glistens
Stream.Such big flashing current requirement DC source 120 has higher capacity, to ensure that it is instantaneous defeated that DC source 120 is had the ability
Go out high-power, the overcurrent protection without triggering DC source 120.However, this high power capacity is waste when LED does not work
's.It is expected to use the DC source with average current capacity rather than flashing current capacity.
In order to reduce the capacity requirement to DC source 120, can take increases energy-storage capacitor and additional charging circuit
Method.Power supply circuit 200 Fig. 2 shows the driving circuit 110 that is combined with charging circuit 240 that includes the prior art shows
It is intended to.Driving circuit 110 shown in Fig. 2 is identical with driving circuit 110 shown in FIG. 1.Power supply circuit 200, which further includes, to be inserted in directly
Charging circuit 240 and energy-storage capacitor 245 between stream source 120 and driving circuit 110.Charging circuit 240 is configured so that
During constant-current type loaded for 130 idle times, charged with low current to energy-storage capacitor 245；And it is loaded in constant-current type
130 when needing pulse power, discharges to provide instantaneous high current by energy-storage capacitor 245, without from prime direct current
Source 120 absorbs energy and because without the DC source 120 with high power capacity.However, this additional charging circuit can increase
Power up complexity, occupied space and the production cost on road.
Embodiment of the disclosure takes full advantage of the driving force of inverse-excitation type constant-current drive circuit.By increasing appropriate change
Depressor coupling coil, the voltage detecting of accumulator, current feedback signal selection and several switches, embodiment of the disclosure will charge
Circuit is merged into constant-current drive circuit, so as to driving circuit realize during first time period to charging accumulator,
And big two functions of pulse current are provided to load during second time period.
Fig. 3 shows the schematic diagram of the power supply circuit 300 including driving circuit 310 according to an embodiment of the present disclosure.It drives
Dynamic circuit 310 obtains power, and the power of acquisition is provided to constant-current type load 130 from DC source 120.For example, constant-current type
Load 130 can be LED flash, particularly, being connected in series with for multiple LED.
Driving circuit 310 mainly includes transformer T, accumulator C and controller 312.The transformer T of driving circuit 310
Including the first coil Coil1, the second coil Coil2 and tertiary coil Coil3 being magnetically coupling to one another.First coil Coil1 is coupled
To DC source 120.Second coil Coil2 for example loads 130 via output diode 114 coupled to constant-current type.Driving circuit 310
Also typically include the output capacitor 116 being connected in parallel with constant-current type load 130.Accumulator C is coupled to transformer T.Although Fig. 3
Accumulator C is shown as capacitor, but the accumulator of other types is known, such as ultracapacitor.312 coupling of controller
Accumulator C is bonded to, and is configured so that during first time period via the first coil Coil1 and third of transformer T
Coil Coil3 is by the power transmission from DC source 120 to accumulator C, via the first of transformer T during second time period
Power is transmitted to constant-current type load 130 by coil Coil1 and the second coil Coil2 from accumulator C.
Driving circuit 310 can include driver 112.Particularly, driver 112 and transformer T can be inverse-excitation type perseverances
Flow a part for driving circuit.By means of the operation of controller 312, driver 112 may be configured so that at the first time
By the energy storage from DC source 120 in first coil Coil1 during the period 1 of section, and cause in first time period
Second round during energy is discharged from tertiary coil Coil3 to accumulator C.By means of the operation of controller 312, driver
112 may be configured so that the energy storage from accumulator C during the period 3 of second time period in First Line
Coil1 is enclosed, and to load energy from the second coil Coil2 to constant-current type during the period 4 of second time period
130 releases.
Driving circuit 310 can include diode D.Diode D is coupling in the first coil of DC source 120 and transformer T
Between Coil1, and be configured to be blocked in during second time period slave accumulator C to the electric current of DC source 120.
In some embodiments, driving circuit 310 can also include first switch SW1 and second switch SW2.First switch
SW1 is coupling between accumulator C and the tertiary coil Coil3 of transformer T.Optionally, in first switch SW1 and tertiary coil
There may be another diode D2 between Coil3, be used to stop the electric current for flowing to tertiary coil Coil3 from accumulator C.Second
Switch SW2 is coupling between accumulator C and the first coil Coil1 of transformer T.The series connection of second switch SW2 and accumulator C connect
It connects and is coupled to DC source 120 via diode D.A terminal of first switch SW1 is connected in second switch SW2 and accumulator
Node between C.During first time period, controller 312 is configured so that first switch SW1 closures and second switch
SW2 is disconnected；And during second time period, controller 312 is configured so that first switch SW1 disconnections and second switch
SW2 is closed.
In some embodiments, driving circuit 310 can also include being coupling in the second coil Coil2 and perseverance of transformer T
Third switch SW3 between flow pattern load 130.The conducting state and the conducting state one of second switch SW2 of third switch SW3
It causes.For example, third switch SW3 and second switch SW2 can be controlled by identical signal.The state of SW1 and SW2/SW3 is complementary.
In some embodiments, controller 312 can include for detect accumulator C voltage detection unit 312-2
And the control signal generator 312-4 coupled to detection unit 312-2.Control signal generator 312-4 may be configured to
Based on the voltage detected by detection unit 312-2, generation is used for the first control signal S1 of first switch SW1 and is opened for second
Close the second control signal S2 of SW2 and third switch SW3.First threshold is decreased below in response to the voltage of accumulator C, first
Control signal S1 causes first switch SW1 to be closed, and second control signal S2 causes second switch SW2 and third to switch SW3
It disconnects.Second threshold is increased above in response to the voltage of accumulator C, first control signal S1 causes first switch SW1 to disconnect,
And second control signal S2 causes second switch SW2 and third to switch SW3 and be closed.Second threshold is higher than first threshold.For example,
First threshold can be close to 0, and second threshold can be close to the value of the voltage of the accumulator C of full charge.In accumulator
Voltage between first threshold and second threshold when, first control signal control first switch and second control signal control
The second switch of system maintains the original state constant.
In some embodiments, driving circuit 310 can also include the first current feedback channel 314 and the second current feedback
Channel 316.First current feedback channel 314, which may be configured to provide, to be indicated to flow to from the tertiary coil Coil3 of transformer T
The signal of the charging current I1 of accumulator C, for setting the steady state value of charging current I1.Second current feedback channel 316 can
To be configured to provide the signal for induced current I2 for indicating to flow through constant-current type load 130, for setting for induced current I2's
Steady state value.The steady state value of charging current I1 is less than the steady state value for induced current I2.In some embodiments, in response to accumulator C
Voltage be decreased below first threshold, first control signal S1 enables the first current feedback channel 314, and the second control letter
Number S2 disables the second current feedback channel 316；Second threshold, the first control letter are increased above in response to the voltage of accumulator C
Number S1 disables the first current feedback channel 314, and second control signal S2 enables the second current feedback channel 316.In energy storage
When the voltage of device is between first threshold and second threshold, the first current feedback channel and second of first control signal control
Second current feedback channel of control signal control keeps former strobe state constant.
It is less than first threshold accordingly, in response to the voltage of accumulator C, driver 112 is received by the first current feedback channel
The first current feedback signal I of the instruction charging current I1 of 314 deliveringsfeedback1, and based on Ifeedback1, driver 112 can
To be configured so that power is provided to accumulator C during first time period with small constant current；In response to accumulator C's
Voltage is higher than second threshold, and driver 112 receives the instruction delivered by the second current feedback channel 316 for the second of induced current I2
Current feedback signal Ifeedback2, and based on Ifeedback2, driver 112 may be configured so that during second time period
With big constant current power is provided to constant-current type load 130.
The switch mentioned in the disclosure can be replaced by the other devices for conducting and the disconnection for being used to implement circuit.This public affairs
The example for the switch mentioned in opening can include at least one of MOSFET, BJT, JFET and IGBT.
When constant-current type load 130 does not work, driving circuit 310 is used as inverse-excitation type charging circuit.At this time on accumulator C also
There is no energy, voltage is low.Controller 312 passes through first control signal S1 and second control signal S2 first switches
SW1 is closed, second switch SW2 and third switch SW3 are disconnected.Diode D forward conductions.In addition, the first current feedback channel 314
Conducting, and the second current feedback channel 316 is turned off.Driving circuit 310 is used as charging circuit, is passed through with small constant current
Tertiary coil Coil3 charges to accumulator C.
After accumulator C is charged to specific voltage, detection unit 312-2 detects high voltage, and in response to this,
Controller 312 is so that first switch SW1 is disconnected, second switch SW2 and third switch SW3 are closed.In addition, the first current feedback is led to
Road 314 is turned off, and the second current feedback channel 316 is connected.Driving circuit 310 is used as inverse-excitation type constant-current drive circuit work
Make, provide high current so that constant-current type to be driven to load 130.The voltage of accumulator C is higher than the voltage of DC source 120 at this time, therefore two
The reverse-biased shutdowns of pole pipe D, DC source 120 will not output current, and completely from accumulator C to load provide energy.Realization passes through
The second coil Coil2 of transformer T provides big pulse current to constant-current type load 130.
It is discharged substantially with the energy of accumulator C, the voltage of accumulator C decreases below particular value, and controller 312
Again so that first switch SW1 is closed, second switch SW2 and third switch SW3 are disconnected.Constant-current type load 130 is stopped.Again
Secondary, the first current feedback channel 314 is connected, and the second current feedback channel 316 is turned off.What repetition charged to accumulator C
Process.
The more detailed example of driving circuit according to an embodiment of the present disclosure is provided below with reference to Fig. 4.
The circuit of the power supply circuit 400 including example driving circuit according to an embodiment of the present disclosure is shown in detail in Fig. 4
Figure.As an example, loaded in Fig. 4 using the constant-current type typically operated by pulse current --- LED flash.Power supply electricity
Road 400 uses General Current type power supply control chip 3843 (U1) as master chip.Chip U1 and N-channel MOS FET Q1 are main
Embody the function of the driver 112 in Fig. 1 to Fig. 3.The peripheral circuit of chip U1 is more, is not shown in Fig. 4 unrelated with the disclosure
Auxiliary circuit.The same reference numerals occurred in Fig. 4 are used to indicate the element identical with Fig. 3.
In Fig. 4, first switch SW1 is embodied as N-channel MOS FET Q3.Second switch SW2 is embodied as P-channel MOSFET
Q4.It could work since LED load must reach certain voltage, the first coil Coil1 and the second coil of transformer T
Number of turn relationship between Coil2 can be used for embodying the function of third switch SW3.Therefore, it is convenient to omit third switchs SW3.
Resistor R1, R2, R8, the light emitting diode in photo-coupler Opto2, diac VD1 form to measure
The detection unit 312-2 of the voltage of accumulator C.Accumulator C can be capacitor.Resistor R8 and photo-coupler Opto2 are also carried
For being used for the signal for the state for switching first switch SW1 and second switch SW2.
Feedback control loop there are two containing on this body structure of chip U1.It is anti-that NPN type triode Q2 may be configured to selection electric current
Feedthrough road.The pin 3 of resistor R3, R4, R5, R7 and chip U1 form the first current feedback channel 314.Resistor R12,
The pin 1 of TL431 chips (U2), photo-coupler Opto1 and chip U1 forms the second current feedback channel 316.
Initially, when the power of DC source 120 is provided to driving circuit, no charge on accumulator C, voltage is relatively low,
And diac VD1 is disconnected.No voltage on resistor R8, therefore P-channel MOSFET Q4 disconnections (are equivalent to second to open
It closes SW2 to disconnect).The light emitting diode of photo-coupler Opto2 is not turned on, therefore its triode disconnects.At this point, transformer T's
Under the action of the driving circuit that 4th coil Coil4, diode D4, capacitor C4 and resistor R9 are formed, N-channel MOS FET
Q3 conductings (are equivalent to first switch SW1 conductings).The first coil Coil1 of N-channel MOS FET Q1 and transformer T forms flyback
The input side of circuit.The tertiary coil Coil3 and diode D2 of transformer T forms a part for charging circuit.At the first time
During section, Coil1 energy storage when Q1 is connected；Energy when Q1 is disconnected on Coil1 will be transferred to outlet side.The number of turn based on coil
Than transformer T is designed to ensure that the voltage coupled on the second coil Coil2 during first time period cannot make LED shine
(being equivalent to third switch SW3 to disconnect).Therefore, the energy on transformer T is transferred completely on accumulator C.At this point, LED is not sent out
Light is accordingly used in the chip U2 and photo-coupler Opto1 of electric current that LED is flowed through in detection and does not work.Second current feedback channel 316
It is off.The pin 1 of chip U1 is in vacant state.Meanwhile NPN type triode Q2 is because without ideal base drive current
And turn off, it is equivalent to the first current feedback channel 314 and is connected.Electric current in circuit is only controlled by the pin 3 of chip U1.Electricity
The pin 3 of input chip U1, is compared with the benchmark inside chip U1 after the peak value of stream is sampled by resistor R7, so as to structure
Into closed loop so that the peak value of electric current does not exceed the benchmark inside chip U1.At this point, the direct current biasing on the pin 8 of chip U1
Voltage divided by resistor R3, R4, R5 it is after-applied on pin 3, so as to raise the sampled current value of resistor R7.This phase
When in reducing current reference value so that the output current of circuit of reversed excitation is very small.It therefore, can be with low current to accumulator C
It charges, without causing DC source 120 that overcurrent protection occurs.
As accumulator C is constantly electrically charged, the voltage on accumulator C gradually rises.When the voltage on accumulator C is increased to
During particular value (voltage on Coil2 is still insufficient to allow LED to shine at this time, is equivalent to what SW3 was still disconnected), on accumulator C
High voltage can be by VD1 triggering and conductings.Become low-resistance after VD1 conductings, so as to have certain current flows through resistor R8, photo-coupler
Opto2, resistor R1, R2 and Q2.Voltage drop on resistor R8 causes Q4 conductings (being equivalent to SW2 conductings).In this way, by energy storage
The high voltage stored on device C is connected to the input side of circuit of reversed excitation.At this point, the reverse-biased cut-offs of D1, DC source 120 no longer gives driving electricity
Road provides energy.The power for being provided to load is all supplied by accumulator C.Meanwhile photo-coupler Opto2 is connected, by Q3's
Gate-to-source short circuit leads to Q3 shutdowns (being equivalent to SW1 shutdowns).Circuit of reversed excitation at this time is in normal constant current driven
Under mode.During second time period, transformer T absorbs the energy of accumulator C when Q1 is connected；When Q1 is turned off, because Q3 is turned off,
The energy of transformer storage can only be discharged on LED and (be equivalent to SW3 conductings).LED is connected, therefore by resistor R12, chip
The second current feedback channel 316 that the pin 1 of U2, photo-coupler Opto1 and chip U1 are formed is connected.After VD1 conductings, R1, R2
There is electric current to pass through on Q2.Q2 is connected so that the direct current biasing of the pin 8 of chip U1 cannot be added on pin 3.This, which is equivalent to, takes
The current reference limitation to have disappeared inside chip U1 so that the output current of flyback driving circuit is by chip U2, photo-coupler Opto1
The benchmark that devices generate is waited to determine.By the pin 1 of chip U1, can control by constant big pulse current on LED, it is complete
It shines into LED.
After LED shines, the voltage on accumulator C declines rapidly.Voltage drop on accumulator C is down to a little higher than DC source
During 120 input voltage, diac VD1 is unable to maintain that enough conducting electric currents and turns off.At this time R8 because VD1 turn off and
Voltage drop is lost, therefore Q4 is turned off and (is equivalent to SW2 shutdowns).Accumulator C is detached from flyback input side.Diode D positively biaseds are connected, directly
Stream source 120 powers again to circuit.Photo-coupler Opto2 is turned off due to VD1 is turned off, and Q3 is connected and (is equivalent to SW1 conductings) again.
Accumulator C is again introduced into charged state.LED (is equivalent to SW3 to close because of the turn ratio relationship of Coil1 and Coil2 without being connected
It is disconnected).Because LED no currents flow through, the second current feedback channel 316 turns off.VD1 shutdowns simultaneously cause R1, R2, Q2 to lose electricity
Stream, Q2 are turned off (the first current feedback channel 314 is connected) again.The direct current biasing of the pin 8 of chip U1 is re-applied to pin 3
On.Entire circuit state is restored to the state to charge to accumulator C.
The above process automatically periodically carries out, without additional periodic swinging control circuit.It can be by setting
The size of charging current and the capacity of selection accumulator are determined, to adjust the frequency of LED flashes of light.
By increasing switch and corresponding control device, embodiment of the disclosure realizes drive using same reverse excitation circuit
Move the function of both circuit and charging circuit.Plain mode in this way, embodiment of the disclosure can be reduced to DC source
Capacity requirement, and the complexity, occupied space and production cost of driving circuit can be reduced.
The presently disclosed embodiments is described above, above description is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.In the case of without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes will be apparent from for the those of ordinary skill in art field.The selection of term used herein, purport
In the principle for best explaining each embodiment, practical application or to the technological improvement of the technology in market or lead this technology
Other those of ordinary skill in domain are understood that each embodiment disclosed herein.
Claims (10)
1. a kind of driving circuit, including：
Transformer, including first coil, the second coil and the tertiary coil being magnetically coupling to one another, the first coil is coupled to direct current
Source, second coil are loaded coupled to constant-current type；
Accumulator, coupled to the transformer；And
Controller coupled to the accumulator, and is configured so that during first time period via the transformer
The first coil and the tertiary coil by the power transmission from the DC source to the accumulator, in second time period
Power is transmitted to the perseverance by period via the first coil and second coil of the transformer from the accumulator
Flow pattern loads.
2. driving circuit according to claim 1, further includes：
First switch is coupling between the accumulator and the tertiary coil of the transformer；And
Second switch is coupling between the accumulator and the first coil of the transformer；
Wherein during the first time period, the controller is configured so that the first switch is closed and described the
Two switches disconnect, and during the second time period, and the controller is configured so that the first switch disconnects simultaneously
And the second switch is closed.
3. driving circuit according to claim 2, further includes：
Third switchs, and is coupling between second coil of the transformer and constant-current type load, the third switch
Conducting state it is consistent with the conducting state of the second switch.
4. driving circuit according to claim 2, wherein the controller includes：
Detection unit is configured to detect the voltage of the accumulator；And
Control signal generator is configured to based on the voltage detected by the detection unit, and generation is for the first switch
First control signal and the second control signal for the second switch.
5. driving circuit according to claim 4, wherein：
First threshold is decreased below in response to the voltage of the accumulator, the first control signal causes the first switch
It is closed, and the second control signal causes the second switch to disconnect；And
Second threshold is increased above in response to the voltage of the accumulator, the first control signal causes the first switch
It disconnects, and the second control signal causes the second switch to be closed；
Wherein described second threshold is higher than the first threshold.
6. driving circuit according to claim 5, further includes：
First current feedback channel is configured to offer instruction and flow to the energy storage from the tertiary coil of the transformer
The signal of the charging current of device, for setting the steady state value of the charging current；And
Second current feedback channel is configured to provide the signal for induced current that constant-current type load is flowed through in instruction, with
In the setting steady state value for induced current；
The steady state value of wherein described charging current is less than the steady state value for induced current.
7. driving circuit according to claim 6, wherein：
The first threshold is decreased below in response to the voltage of the accumulator, the first control signal enables described first
Current feedback channel, and the second control signal disables the second current feedback channel；And
The second threshold, the first control signal disabling described first are increased above in response to the voltage of the accumulator
Current feedback channel, and the second control signal enables the second current feedback channel.
8. driving circuit according to claim 1, further includes：
Diode is coupling between the DC source and the first coil of the transformer, and is configured to be blocked in
During the second time period from the accumulator to the electric current of the DC source.
9. driving circuit according to claim 1, wherein constant-current type load is LED flash.
10. according to the driving circuit described in any one of claim 1-9, driven wherein the driving circuit is inverse-excitation type constant current
Dynamic circuit.
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| CN201611168585.3A CN108207053B (en) | 2016-12-16 | 2016-12-16 | Driving circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI773214B (en) * | 2020-04-20 | 2022-08-01 | 華邦電子股份有限公司 | Electronic oscillator and semiconductor integrated circuit |
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| CN108207053B (en) | 2019-11-26 |
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