CN102802306B - Driving circuit and driving control method of light-emitting diode - Google Patents
Driving circuit and driving control method of light-emitting diode Download PDFInfo
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- CN102802306B CN102802306B CN201210271415.3A CN201210271415A CN102802306B CN 102802306 B CN102802306 B CN 102802306B CN 201210271415 A CN201210271415 A CN 201210271415A CN 102802306 B CN102802306 B CN 102802306B
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Abstract
The invention discloses a driving circuit and a driving control method of a light-emitting diode. The driving circuit of the light-emitting diode comprises a battery, an inductor, a double-electric-layer capacitor, a first field-effect tube, a second field-effect tube, a third field-effect tube, the light-emitting diode and a controller, wherein the inductor is connected with the battery; the double-electric-layer capacitor is connected between the negative electrode of the battery and the first end of the inductor; the first field-effect tube is respectively connected with the inductor and the double-electric-layer capacitor; the second field-effect tube is also respectively connected with the inductor and the double-electric-layer capacitor; the third field-effect tube is respectively connected with the inductor and the battery; the light-emitting diode is connected between the capacitor and the first field-effect tube; the controller is respectively connected with the first field-effect tube, the second field-effect tube and the third field-effect tube. According to the invention, the problem of lower energy utilization rate of the driving circuit of the light-emitting diode in the prior art is solved, so that the effects of improving the energy efficiency and element utilization rate and reducing the production cost of the system are achieved.
Description
Technical field
The present invention relates to electronic circuit field, in particular to a kind of LED driving circuit and driving control method thereof.
Background technology
On camera, when the photoflash lamp of the camera that especially mobile phone embeds is worked, need to from its lithium battery, extract larger electric current for photoflash lamp work, and this electric current tends to exceed the maximum discharge capability of lithium battery, so just the application of photoflash lamp is restricted, for addressing this problem, a kind of application double electric layer capacitor (Electrical Double Layer Capacitance is provided in prior art, abbreviation EDLC) circuit arrangement, Fig. 1 a and Fig. 1 b are respectively outside schematic diagram and the internal circuit configuration figure of flashlight driving circuit that adopts a kind of other scheme of EDLC, as shown in Figure 1a, adopt the circuit of the AAT1282 of AATI company, this main circuit will lead to excess capacity high voltage capacitance group 1 to be realized as the Storage Unit of LED photoflash lamp 2, wherein, large capacity high voltage capacitance group 1 is in series by two EDLC, the operation principle of this kind of circuit is: under higher interlude voltage, carry out accumulation of energy, then from EDLC, with linear mode, regulate and output current, wherein adopt inductance boost mode that lower cell voltage is risen to higher accumulation of energy voltage.The scheme that also provides the ADP1560 of a kind of ADI of employing company to carry out the accumulation of energy of interlude output in prior art, its circuit diagram as shown in Figure 2, the scheme of this kind of circuit and AATI is similar, just linear output regulating circuitry from the position transfer of ground connection to connecing the position of energy storage capacitor.Although the efficiency of AAT1282 and ADP1560 booster tension is higher, the adjusting of its output current is controlled and has been adopted linear arrangement.This scheme is subject to the restriction of EDLC upper voltage limit and LED driving lower voltage limit, and utilizable energy storage capacity is limited, large capacity high voltage series connection EDLC electric capacity is used in requirement.It controls output current with linear mode, and efficiency and device capacity utilance have further loss.
There is the problem that capacity usage ratio is lower in the drive circuit for light-emitting diode in correlation technique, not yet proposes at present effective solution.
Summary of the invention
Main purpose of the present invention is a kind of drive circuit of light-emitting diode to be provided and to drive control method, to solve the drive circuit of light-emitting diode in prior art, has the problem that capacity usage ratio is lower.
To achieve these goals, according to an aspect of the present invention, provide a kind of drive circuit of light-emitting diode, having comprised: battery; Inductance, is connected with battery; Double electric layer capacitor, is connected between the negative pole of battery and the first end of inductance; The first field effect transistor, the source electrode of the first field effect transistor is connected with first node, and the drain electrode of the first field effect transistor is connected with the second end of inductance, and wherein, first node is the node between double electric layer capacitor and the negative pole of battery; The second field effect transistor, the source electrode of the second field effect transistor is connected with first node, and the drain electrode of the second field effect transistor is connected with the second end of inductance; The 3rd field effect transistor, the 3rd source electrode of field effect transistor and the positive pole of battery are connected, and the drain electrode of the 3rd field effect transistor is connected with the second end of inductance; Light-emitting diode, is connected between first node and the source electrode of the first field effect transistor; And controller, be connected respectively with the grid of the first field effect transistor, the grid of the grid of the second field effect transistor, the 3rd field effect transistor, for charging to double electric layer capacitor by controlling the on off state of the second field effect transistor and the 3rd field effect transistor, and drive lumination of light emitting diode by controlling the on off state of the first field effect transistor and the second field effect transistor.
Further, drive circuit also comprises: the 4th field effect transistor, and the drain electrode of the 4th field effect transistor is connected with controller; The 5th field effect transistor, the drain electrode of the 5th field effect transistor is connected with the source electrode of the 4th field effect transistor, the body end of the 5th field effect transistor is connected with the grid of the second field effect transistor, and the source electrode of the 5th field effect transistor is connected to first node, and the grid of the 5th field effect transistor is connected with controller; Amplifier, the first input end of amplifier is connected respectively with controller with the second end of inductance, the second input of amplifier is connected to Section Point, the output of amplifier is connected to the grid of the 4th field effect transistor, wherein, Section Point is the node between the drain electrode of the 5th field effect transistor and the source electrode of the 4th field effect transistor; And first switch, the first moving contact of the first switch is connected with the grid of the first field effect transistor, and the second moving contact of the first switch is connected with the grid of the 3rd field effect transistor, and the common port contact of the first switch is connected with controller.
Further, controller comprises: current deviation acquisition module, is connected with the drain electrode of the 4th field effect transistor; The first voltage deviation acquisition module, is connected with the first input end of amplifier; Second voltage deviation acquisition module, is connected with the positive pole of battery; And control module, be connected respectively with current deviation acquisition module, the first voltage deviation acquisition module and second voltage deviation acquisition module, for basis, from the collection signal of current deviation acquisition module, the first voltage deviation acquisition module and second voltage deviation acquisition module, control the on off state of the first field effect transistor, the second field effect transistor and the 3rd field effect transistor.
Further, current acquisition module comprises: the first limiting amplifier, the first input end of the first limiting amplifier is connected with the drain electrode of the 4th field effect transistor, the second input of the first limiting amplifier is used for receiving predetermined current, the first voltage acquisition module comprises: the second limiting amplifier, the first input end of the second limiting amplifier is connected with the second end of inductance, the second input of the second limiting amplifier is used for receiving the first predeterminated voltage, second voltage acquisition module comprises: the 3rd amplifier, the 3rd first input end of amplifier and the positive pole of battery are connected, the second input of the 3rd amplifier is used for receiving the second predeterminated voltage, control module comprises: the 4th limiting amplifier, the output of the input of the 4th limiting amplifier and the first limiting amplifier, the output of the second limiting amplifier is connected respectively with the output of the 3rd amplifier, comparator, the first input end of comparator is connected with the output of the 4th limiting amplifier, and the second input of comparator is used for receiving the first driving signal, and trigger, the input of trigger is connected with the output of comparator, and the output of trigger is connected respectively with the grid of the 5th field effect transistor with the common port contact of the first switch.
Further, drive circuit also comprises: second switch, the common port contact of second switch is connected with the position of the switch control end of the first switch, and the first moving contact of second switch is used for receiving two driving signal, and the second moving contact of second switch is connected with controller.
Further, two driving signal is square-wave signal, and in square-wave signal, high level signal is 3:2 with the time ratio of low level signal.
Further, light-emitting diode comprises the light-emitting diode of a plurality of series connection.
To achieve these goals, according to an aspect of the present invention, provide a kind of driving control method of light-emitting diode, the drive circuit of any light-emitting diode that this driving control method can provide by foregoing of the present invention is carried out,
To achieve these goals, according to an aspect of the present invention, a kind of driving control method of light-emitting diode is provided, wherein, LED driving circuit comprises battery, inductance, double electric layer capacitor and light-emitting diode, and control method comprises: control battery, inductance and double electric layer capacitor and form the first loop so that battery charges to inductance and double electric layer capacitor; Control inductance and double electric layer capacitor and form second servo loop so that inductance charges to double electric layer capacitor; By second servo loop, double electric layer capacitor is shifted energy for the magnetic field energy of inductance; And control that double electric layer capacitor, inductance and light-emitting diode form tertiary circuit so that double electric layer capacitor to light-emitting diodes tube discharge.
Further, LED driving circuit also comprises the first field effect transistor, the second field effect transistor and the 3rd field effect transistor, wherein, inductance is connected with battery, double electric layer capacitor is connected between the negative pole of battery and the first end of inductance, the source electrode of the first field effect transistor is connected with first node, the drain electrode of the first field effect transistor is connected with the second end of inductance, wherein, first node is the node between double electric layer capacitor and the negative pole of battery, the source electrode of the second field effect transistor is connected with first node, the drain electrode of the second field effect transistor is connected with the second end of inductance, the 3rd source electrode of field effect transistor and the positive pole of battery are connected, the drain electrode of the 3rd field effect transistor is connected with the second end of inductance, light-emitting diode is connected between first node and the first field effect transistor, wherein, control the 3rd field effect transistor conducting so that battery, inductance and double electric layer capacitor form the first loop, control the second field effect transistor conducting so that inductance and double electric layer capacitor form second servo loop, control the first field effect transistor conducting so that double electric layer capacitor, inductance and light-emitting diode form tertiary circuit.
By the present invention, adopt the LED driving circuit that comprises following structure: battery; Inductance, is connected with battery; Double electric layer capacitor, is connected between the negative pole of battery and the first end of inductance; The first field effect transistor, the source electrode of the first field effect transistor is connected with first node, and the drain electrode of the first field effect transistor is connected with the second end of inductance, and wherein, first node is the node between double electric layer capacitor and the negative pole of battery; The second field effect transistor, the source electrode of the second field effect transistor is connected with first node, and the drain electrode of the second field effect transistor is connected with the second end of inductance; The 3rd field effect transistor, the 3rd source electrode of field effect transistor and the positive pole of battery are connected, and the drain electrode of the 3rd field effect transistor is connected with the second end of inductance; Light-emitting diode, is connected between first node and the first field effect transistor; And controller, be connected respectively with the grid of the first field effect transistor, the grid of the grid of the second field effect transistor, the 3rd field effect transistor, for charging to double electric layer capacitor by controlling the on off state of the second field effect transistor and the 3rd field effect transistor, and drive lumination of light emitting diode by controlling the on off state of the first field effect transistor and the second field effect transistor.By controlling the on off state of the second field effect transistor and the 3rd field effect transistor, to double electric layer capacitor, charge, and drive lumination of light emitting diode by controlling the on off state of the first field effect transistor and the second field effect transistor, realized and adopted the on-off mode of high energy efficiency to carry out power conversion, avoided available technology adopting linear mode to control efficiency that output current causes and the loss of device capacity utilance, solve the drive circuit of light-emitting diode in prior art and had the problem that capacity usage ratio is lower, and then raising efficiency and element utilance have been reached, the effect of reduction system production cost.
Accompanying drawing explanation
The accompanying drawing that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 a and Fig. 1 b are respectively according to the outside schematic diagram of the drive circuit of the employing EDLC of correlation technique and internal circuit configuration figure;
Fig. 2 is according to the circuit diagram of the drive circuit of the employing ADP1560 of correlation technique;
Fig. 3 is according to the schematic diagram of the drive circuit of first embodiment of the invention;
Fig. 4 is according to the schematic diagram of the drive circuit of second embodiment of the invention; And
Fig. 5 is according to the flow chart of the driving control method of the embodiment of the present invention.
Embodiment
It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
The embodiment of the present invention provides a kind of drive circuit of light-emitting diode, below the drive circuit of light-emitting diode that the embodiment of the present invention is provided be specifically introduced:
Fig. 3 is according to the schematic diagram of the drive circuit of first embodiment of the invention, as shown in Figure 3, the drive circuit of this first embodiment comprises battery B, inductance L 1, double electric layer capacitor CS, the first field effect transistor Q1, the second field effect transistor Q2, the 3rd field effect transistor Q3, LED and controller 10.
Wherein, double electric layer capacitor CS is connected between the negative pole of battery B and the first end of inductance L 1; The source electrode of the first field effect transistor Q1 is connected to the node (hereinafter referred to as first node) between double electric layer capacitor and the negative pole of battery B, and the drain electrode of the first field effect transistor Q1 is connected with the second end of inductance L 1; The source electrode of the second field effect transistor Q2 is also connected with first node, and the drain electrode of the second field effect transistor Q2 is also connected with the second end of inductance L 1; The source electrode of the 3rd field effect transistor Q3 is connected with the positive pole of battery B, and the drain electrode of the 3rd field effect transistor Q3 is also connected with the second end of inductance L 1; LED, is connected between first node and the source electrode of the first field effect transistor Q1; Controller 10 is connected respectively with the grid of the first field effect transistor Q1, the grid of the grid of the second field effect transistor Q2, the 3rd field effect transistor Q3, for charging to double electric layer capacitor by controlling the on off state of the second field effect transistor Q2 and the 3rd field effect transistor Q3, and drive LED luminous by controlling the on off state of the first field effect transistor Q1 and the second field effect transistor Q2.
By controlling the on off state of the second field effect transistor and the 3rd field effect transistor, in switch step-down mode, to double electric layer capacitor, charge, and by controlling the on off state of the first field effect transistor and the second field effect transistor, in boost switching mode, drive lumination of light emitting diode, realized the power conversion that adopts high energy efficiency, avoided using in prior art high voltage EDLC, the efficiency that employing linear mode control output current causes and the loss of device capacity utilance, solve the drive circuit of light-emitting diode in prior art and had the problem that capacity usage ratio is lower, and then raising efficiency and element utilance have been reached, the effect of reduction system production cost.
Fig. 4 is according to the schematic diagram of the drive circuit of second embodiment of the invention, as shown in Figure 4, the drive circuit of second embodiment of the invention is compared with the drive circuit of first embodiment of the invention, the two difference is, the drive circuit of second embodiment of the invention also comprises: the 4th field effect transistor Q4, the 5th field effect transistor Q5, amplifier A5 and the first K switch 1.
Wherein, the drain electrode of the 4th field effect transistor Q4 is connected with controller 10; The drain electrode of the 5th field effect transistor Q5 is connected with the source electrode of the 4th field effect transistor Q4, the 5th field effect transistor Q5 splits, possesses the picture field effect transistor that small scale identical how much distributes from the second field effect transistor, the 5th field effect transistor Q5 with the same grid of the second field effect transistor Q2 homology; The first input end of amplifier A5 is connected respectively with controller 10 with the second end of inductance, the second input of amplifier A5 is connected to Section Point, the output of amplifier A5 is connected to the grid of the 4th field effect transistor Q4, wherein, Section Point is the node between the drain electrode of the 5th field effect transistor Q5 and the source electrode of the 4th field effect transistor Q4; Particularly, the second field effect transistor Q2, the 4th field effect transistor Q4, the 5th field effect transistor Q5 and amplifier A5 form the image current sampling to the second field effect transistor Q2; The first moving contact of the first K switch 1 is connected with the grid of the first field effect transistor Q1, and the second moving contact of the first K switch 1 is connected with the grid of the 3rd field effect transistor Q3, and the common port contact of the first K switch 1 is connected with controller 10.
Particularly, controller 10 is interior can comprise the current deviation acquisition module being connected with the drain electrode of the 4th field effect transistor Q4, the the first voltage deviation acquisition module being connected with the second input of inductance, the second voltage deviation acquisition module being connected with the positive pole of battery B, and with current deviation acquisition module, the control module that the first voltage deviation acquisition module is connected respectively with second voltage deviation acquisition module, control module basis is from current deviation acquisition module, the collection signal of the first voltage deviation acquisition module and second voltage deviation acquisition module is controlled the first field effect transistor Q1, the on off state of the second field effect transistor Q2 and the 3rd field effect transistor Q3.
Take current deviation acquisition module as the first limiting amplifier A1(A1 be differential amplifier), the first voltage deviation acquisition module is that the second limiting amplifier A2(A2 is differential amplifier), second voltage deviation acquisition module is the 3rd amplifier A3, control module comprises that the 4th limiting amplifier A4(A4 is for adding and amplifier), comparator C and trigger D are the operation principle that example illustrates the drive circuit of second embodiment of the invention, wherein, the first input end of the first limiting amplifier A1 is connected with the drain electrode of the 4th field effect transistor Q4, the second input of the first limiting amplifier A1 is used for receiving predetermined current I1, the first input end of the second limiting amplifier A2 and inductance the second end be connected, the second input of the second limiting amplifier A2 is used for receiving the first predeterminated voltage V1, the first input end of the 3rd amplifier A3 is connected with the positive pole of battery B, the second input of the 3rd amplifier A3 is used for receiving the second predeterminated voltage V2, add input and A1 with amplifier A4, the output of A2 and A3 is all connected, the output of A4 is connected to an input of comparator C, another input of comparator C receives the sawtooth signal of fixed amplitude, the output of comparator C is connected with trigger D, the homophase of trigger D is connected with the common port contact of the first K switch 1 with the grid of the 5th field effect transistor Q5 respectively again with anti-phase output.Above-mentioned predetermined current I1 is that the Light-Emitting Diode drive current that need to stipulate by application is discharging current, the voltage charging voltage that will reach and maintain when predeterminated voltage V1 is energy storage capacitor accumulation of energy, predeterminated voltage V2 is to be that the minimum voltage that allows battery to drop to is discharge voltage from cell drawing energy.In second embodiment of the invention, the second field effect transistor Q2, the 4th field effect transistor Q4, the 5th field effect transistor Q5 and amplifier A5 form current-mirror structure, the periphery of current-mirror structure is also provided with necessary electronic device R1, C1, R2 and C2, particular location relation is shown in Figure 4, and the operation principle of the drive circuit of second embodiment of the invention is specific as follows:
Step 1: control the time scale of Q2 and Q3 alternate conduction, so that battery B charges to capacitor C S.Particularly, when drive circuit is started working, Q2 and Q3 alternate conduction, the frequency of the two alternate conduction is sawtooth wave frequency, and the time scale of alternate conduction is controlled by the output of A2 and A3.In this step, the running current opposite direction of the electric current flowing through in Q2 current-mirror structure and current mirror, A1 in oppositely saturated, output a definite amplitude low-voltage.The first input end of A2 amplifier is connected to the node between R2 and C2, realization gathers the voltage at double electric layer capacitor CS two ends, A2 amplifier amplifies the difference of the actual capacitance voltage of predetermined voltage V1 and CS, when the voltage of capacitor C S is more lower than predetermined voltage V1, the output of A2 is limited in the low-voltage of a definite amplitude, or a value proportional to deviation of output.A3 amplifies the difference of the current voltage of battery B and the minimum voltage V2 of permission, needs only current cell voltage higher than the minimum voltage allowing, and A3 just exports the low-voltage of determining amplitude.Only have when cell voltage approaches the minimum voltage allowing, A3 is output as a magnitude of voltage relevant to deviation.A4 is one and adds and amplifier, and it is designed to when A1, A2 and A3 are output as minimum voltage, and its output is a little more than the lowest amplitude of fixed amplitude sawtooth waveforms; The duty ratio of now comparator C output is maximum duty cycle.Because the voltage as capacitor C S approaches predetermined voltage V1, or/and during the minimum voltage V2 that the voltage of battery B approach to allow, the output of A4 raises, relatively makes the output duty cycle of C decline with sawtooth waveforms, until the output of A4 exceed sawtooth waveforms amplitude, make the duty ratio of C output until drop to zero.Particularly, the alternate conduction of Q2 and Q3 is to be driven by the complementary output of trigger D, D is Dead Time generator, when comparator C is when its first input end receives the relatively more lower duty ratio producing of the sawtooth waveforms that the margin of error of effective control receives with its second input pulse train relevant with error size, this pulse train has the frequency consistent with sawtooth waveforms, simultaneously, this pulse train is delivered to after Dead Time generator D, after inserting a Dead Time by D, generate complementary output, , the variable duty cycle sequence of C is controlled trigger D through Dead Time, produce the driving signal of controlling Q2 and Q3 switch, the corresponding Q3 conducting long period of higher duty cycle, make the voltage of CS larger, otherwise make it less.Wherein, so-called Dead Time refers to Q2 and Q3 time of not conducting.Ideally Q2 and Q3 are staggered opens, and Q2 and Q3 is driven with output and the paraphase thereof of C.But actual can not instant shut-in, so a field effect transistor after will opening again after previous field effect transistor is turned off a bit of time, D Dead Time generator completes this function.If do not insert Dead Time, there is the conducting simultaneously of a bit of time in Q2 and Q3, and this will cause battery short circuit.Above-mentioned feedback procedure makes, as long as battery still can maintain energy output, finally to make battery reach predetermined voltage, and system proceeds to step 2.
Step 2: maintain the voltage of capacitor C S, wait for outer triggering signal, outer triggering signal is used to indicate capacitor C S and discharges to LED.Particularly, during whole step 2, the voltage of battery B only has A2 working control duty ratio while being not less than predeterminated voltage V2, maintains the voltage stabilization of capacitor C S at predetermined voltage V1.
Step 3: receive after outer triggering signal, control Q1 and Q2 alternate conduction, the energy storage of capacitor C S is released by LED with constant current, make LED flash of light.Particularly, during step 3, owing to no longer obtaining energy from battery B, the minimum voltage of amplitude is determined in A3 output; The voltage of capacitor C S starts to decline, and A2 also can export minimum voltage very soon; A1 is also output minimum voltage at the beginning; The now output of A4 is also minimum voltage, corresponding C output maximum duty cycle.In the time of Q2 conducting, energy storage capacitor CS discharges by inductance L 1, and the electric current of inductance L 1 increases gradually; Q1 conduction period, the electric current of inductance L 1 is imported into LED through Q1.Because the conducting voltage of LED, between 3.2V ~ 3.5V, is greater than the voltage of energy storage capacitor; The electric current that inductance passes through during this declines.At this state, compared with big space rate, cause larger LED drive current.
In the drive circuit of second embodiment of the invention, the design of differential amplifier A1 is used for detecting the electric current to LED electric discharge, when LED electric current approaches scheduled current, exports a voltage relevant to deviation, this voltage regulates the duty ratio of C after amplifying by A4, make LED current stabilization in predetermined value.To the detection of LED discharging current, be wherein that current-mirror structure by Q2 realizes, what gather is the pulse current between inductance L charge period, this electric current is proportional with output current under continuous mode, and the LED drive circuit of High-current output is to be also operated under continuous mode.This sample rate current obtains a magnitude of voltage after level and smooth, and this magnitude of voltage is sent into amplifier A1 amplification and controlled afterwards Q1 and Q2 with on-off mode stable output electric current.This current mirror is a pulse controlled intermittent current sampling channel, only at Q2, in conduction period, a proportional current is delivered to an input of A1; After this proportional current is average via RC circuit, form a ratio value relevant with the mean value of intermittent current, this be worth electric current in inductance when continuous conduction mode and LED electric current proportional.Be that this sample circuit has been realized the indirect sampling to LED electric current, detect and control this electric current to the detection of LED electric current and control.
Further, the drive circuit of second embodiment of the invention also comprises second switch K2, the common port contact of second switch K2 is connected with the position of the switch control inputs of the first K switch 1, the first moving contact of second switch K2 is used for receiving two driving signal, wherein, two driving signal is high level signal with the time of low level signal than being the square-wave signal of 3:2, the frequency of square-wave signal is 100Hz, the second moving contact of second switch K2 is connected with a control bit output of controller, control word in controller and position comprise that output current arranges register words, charging voltage is selected position, flash of light/charging control bit m1, stable/alternately control bit m2 and discharge voltage selection, wherein, it is that numeral, this digital translation that represents needed output current becomes Voltage-output to the first voltage deviation acquisition module that output current arranges register words, and charging voltage selects position to be used for selecting two different charging voltages, flash of light/charging control bit m1 is when second switch K2 makes the common port contact of K2 be connected to m1 according to the control of m2 position, by the connection of the content-control K1 of m1, is flash of light or is charged, stable/common that alternately control bit m2 is used for controlling K2 is connected to two driving signal or m1 position.
Wherein, when the contact of common port contact and the reception of second switch K2 " flash of light/charging control bit m1 " is connected, drive circuit is according to the state of m1, according to above-mentioned steps 1-2 accumulation of energy with maintain, or drives LED according to above-mentioned steps 3; When the common port contact of second switch K2 and the contact of reception " square-wave signal " are connected, drive circuit is alternately charging-is maintaining according to the control of square wave and driving Light-Emitting Diode, make LED continuously pulsed illumination, as flashlight, use; While making flashlight, LED only allows by less continuous current, to prevent that it from being burnt by overheated.This electric current is that discharging current is still specified by outside, can only be below 1/5 of flashing current conventionally.The normal working voltage scope of lithium battery B is 3.55V ~ 4.2V, the ceiling voltage of energy storage capacitor is 2.6V ~ 2.7V, the luminous voltage of LED is between 3.2V ~ 3.5V, and these numerical value have determined that 2:3 square wave can guarantee that this charge and discharge process can keep output current can maintain predetermined value.If the voltage of fruit battery B can not keep higher than the minimum voltage allowing, will cause the corresponding decline of LED electric current until completely can not output current.In this embodiment, the voltage that the minimum cell voltage that also can select to allow can effectively be exported lower than battery will maintain torch output until battery inefficacy itself in this situation.
The drive circuit of second embodiment of the invention forms step-down switching modulator by Q2 and Q3, during accumulation of energy with on-off mode energy storage on EDLC magnanimity capacitor C S; During driving LED electric discharge, by Q1 and Q2, form booster circuit, from CS, obtain the output of power generation driving voltage.Wherein, the CS minimum voltage that can maintain stable output during driving depends primarily on the conducting resistance of Q2, and the scope of utilizing of energy storage capacity is determined by maximum permissible voltage and the above-mentioned minimum voltage of EDLC.With 80% boosting efficiency, 1.4V calculates to the voltage range utilized of 2.7V and the LED of single 3.4V forward voltage drop of 200ms current stabilization driving, and often the stable output needed capacitance C of I (A) (F) is 0.32I.These parameters are significantly better than other scheme.
Further, the light-emitting diode in the drive circuit of the light-emitting diode that the above-mentioned arbitrary embodiment of the present invention provides can be undertaken by a plurality of diodes in series, to realize, drives the light-emitting diode of series connection to carry out luminous.
The embodiment of the present invention also provides a kind of driving control method of light-emitting diode, any drive circuit that this driving control method can provide by the above embodiment of the present invention is carried out, and the driving control method that the drive circuit providing below in conjunction with embodiment of the present invention foregoing provides the embodiment of the present invention is specifically introduced:
Fig. 5 is according to the flow chart of the driving control method of the embodiment of the present invention, and as shown in Figure 5, the driving control method of this embodiment comprises the steps S502 to S506:
S502: control battery, inductance and double electric layer capacitor and form the first loop so that battery charges to inductance and double electric layer capacitor; Particularly, can control field effect transistor Q3 conducting in drive circuit realizes battery, inductance and double electric layer capacitor and forms the first loop.
S504: control inductance and double electric layer capacitor and form second servo loop so that inductance charges to double electric layer capacitor; Particularly, the field effect transistor Q2 conducting that can control in drive circuit realizes inductance and double electric layer capacitor formation second servo loop, by realizing inductance at afterflow period chien shih inductive energy storage to electric capacity transfer, double electric layer capacitor is charged, then by controlling the time scale of the first and second loop works, maintain the voltage of double electric layer capacitor.
S506: by second servo loop, double electric layer capacitor is shifted energy for the magnetic field energy of inductance, particularly, make capacitance energy storage see through inductive discharge, energy is shifted as the magnetic field energy of inductance.
S508: control that double electric layer capacitor, inductance and light-emitting diode form tertiary circuit so that double electric layer capacitor and inductance in series jointly to light-emitting diodes tube discharge; Particularly, can control field effect transistor Q1 conducting in drive circuit and realize double electric layer capacitor, inductance and light-emitting diode and form tertiary circuit, then by control the 3rd and the time scale of second servo loop work maintain the stabling current of light-emitting diode driven.
The driving control method of the embodiment of the present invention realizes to double electric layer capacitor charging or drives lumination of light emitting diode by controlling the on off operating mode in each loop, realized and adopted the on-off mode of high energy efficiency to carry out power conversion, avoided available technology adopting linear mode to control efficiency that output current causes and the loss of device capacity utilance, solve the drive circuit of light-emitting diode in prior art and had the problem that capacity usage ratio is lower, and then reached the effect that improves efficiency and element utilance, reduces system production cost.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. a drive circuit for light-emitting diode, is characterized in that, comprising:
Battery;
Inductance, is connected with described battery;
Double electric layer capacitor, is connected between the negative pole of described battery and the first end of described inductance;
The first field effect transistor, the source electrode of described the first field effect transistor is connected with first node, the drain electrode of described the first field effect transistor is connected with the second end of described inductance, and wherein, described first node is the node between described double electric layer capacitor and the negative pole of described battery;
The second field effect transistor, the source electrode of described the second field effect transistor is connected with described first node, and the drain electrode of described the second field effect transistor is connected with the second end of described inductance;
The 3rd field effect transistor, described the 3rd source electrode of field effect transistor and the positive pole of described battery are connected, and the drain electrode of described the 3rd field effect transistor is connected with the second end of described inductance;
Light-emitting diode, is connected between described first node and the source electrode of described the first field effect transistor; And
Controller, be connected respectively with the grid of described the first field effect transistor, the grid of the grid of described the second field effect transistor, described the 3rd field effect transistor, for charging to described double electric layer capacitor by controlling the on off state of described the second field effect transistor and described the 3rd field effect transistor, and drive described lumination of light emitting diode by controlling the on off state of described the first field effect transistor and described the second field effect transistor.
2. drive circuit according to claim 1, is characterized in that, described drive circuit also comprises:
The 4th field effect transistor, the drain electrode of described the 4th field effect transistor is connected with described controller;
The 5th field effect transistor, described the 5th field effect transistor and described the second field effect transistor are the current mirror field effect transistor that source electrode and grid link together, and the drain electrode of described the 5th field effect transistor is connected with the source electrode of described the 4th field effect transistor;
Amplifier, the first input end of described amplifier is connected respectively with described controller with the second end of described inductance, the second input of described amplifier is connected to Section Point, the output of described amplifier is connected to the grid of described the 4th field effect transistor, wherein, described Section Point is the node between the drain electrode of described the 5th field effect transistor and the source electrode of described the 4th field effect transistor; And
The first switch, the first moving contact of described the first switch is connected with the grid of described the first field effect transistor, the second moving contact of described the first switch is connected with the grid of described the 3rd field effect transistor, and the common port contact of described the first switch is connected with described controller.
3. drive circuit according to claim 2, is characterized in that, described controller comprises:
Current deviation acquisition module, is connected with the drain electrode of described the 4th field effect transistor;
The first voltage deviation acquisition module, is connected with the first input end of described amplifier;
Second voltage deviation acquisition module, is connected with the positive pole of described battery; And
Control module, be connected respectively with described current deviation acquisition module, described the first voltage deviation acquisition module and described second voltage deviation acquisition module, for basis, from the collection signal of described current deviation acquisition module, described the first voltage deviation acquisition module and described second voltage deviation acquisition module, control the on off state of described the first field effect transistor, described the second field effect transistor and described the 3rd field effect transistor.
4. drive circuit according to claim 3, is characterized in that,
Described current acquisition module comprises:
The first limiting amplifier, the first input end of described the first limiting amplifier is connected with the drain electrode of described the 4th field effect transistor, and the second input of described the first limiting amplifier is used for receiving predetermined current,
Described the first voltage acquisition module comprises:
The second limiting amplifier, the first input end of described the second limiting amplifier is connected with the second end of described inductance, and the second input of described the second limiting amplifier is used for receiving the first predeterminated voltage,
Described second voltage acquisition module comprises:
The 3rd amplifier, described the 3rd first input end of amplifier and the positive pole of described battery are connected, and the second input of described the 3rd amplifier is used for receiving the second predeterminated voltage,
Described control module comprises:
The 4th limiting amplifier, the input of described the 4th limiting amplifier is connected respectively with the output of described the 3rd amplifier with the output of described the first limiting amplifier, the output of described the second limiting amplifier;
Comparator, the first input end of described comparator is connected with the output of described the 4th limiting amplifier, and the second input of described comparator is used for receiving the first driving signal; And
Trigger, the input of described trigger is connected with the output of described comparator, and the output of described trigger is connected respectively with the grid of described the 5th field effect transistor with the common port contact of described the first switch.
5. drive circuit according to claim 2, is characterized in that, described drive circuit also comprises:
Second switch, the common port contact of described second switch is connected with the position of the switch control end of described the first switch, the first moving contact of described second switch is used for receiving two driving signal, and the second moving contact of described second switch is connected with the flash of light/charging control bit m1 from described controller.
6. drive circuit according to claim 5, is characterized in that, described two driving signal is square-wave signal, and in described square-wave signal, high level signal is 3:2 with the time ratio of low level signal.
7. drive circuit according to claim 1, is characterized in that, described light-emitting diode comprises the light-emitting diode of a plurality of series connection.
8. a driving control method for light-emitting diode, is characterized in that, LED driving circuit comprises battery, inductance, double electric layer capacitor and light-emitting diode, and described control method comprises:
Control that described battery, described inductance and described double electric layer capacitor form the first loop so that described battery charges to described inductance and described double electric layer capacitor;
Control described inductance and described double electric layer capacitor and form second servo loop so that described inductance charges to described double electric layer capacitor;
By described second servo loop, described double electric layer capacitor being shifted energy is the magnetic field energy of described inductance; And
Control that described double electric layer capacitor, described inductance and described light-emitting diode form tertiary circuit so that described double electric layer capacitor to described light-emitting diodes tube discharge.
9. driving control method according to claim 8, is characterized in that, described LED driving circuit also comprises the first field effect transistor, the second field effect transistor and the 3rd field effect transistor, wherein,
Described inductance is connected with described battery,
Described double electric layer capacitor is connected between the negative pole of described battery and the first end of described inductance,
The source electrode of described the first field effect transistor is connected with first node, and the drain electrode of described the first field effect transistor is connected with the second end of described inductance, and wherein, described first node is the node between described double electric layer capacitor and the negative pole of described battery,
The source electrode of described the second field effect transistor is connected with described first node, and the drain electrode of described the second field effect transistor is connected with the second end of described inductance,
Described the 3rd source electrode of field effect transistor and the positive pole of described battery are connected, and the drain electrode of described the 3rd field effect transistor is connected with the second end of described inductance,
Described light-emitting diode is connected between described first node and the source electrode of described the first field effect transistor,
Wherein,
Control described the 3rd field effect transistor conducting so that described battery, described inductance and described double electric layer capacitor form described the first loop,
Control described the second field effect transistor conducting so that described inductance and described double electric layer capacitor form described second servo loop,
Control described the first field effect transistor conducting so that described double electric layer capacitor, described inductance and described light-emitting diode form described tertiary circuit.
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| JP2011233442A (en) * | 2010-04-28 | 2011-11-17 | Toshiba Information Systems (Japan) Corp | Led drive device |
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| JP2011233442A (en) * | 2010-04-28 | 2011-11-17 | Toshiba Information Systems (Japan) Corp | Led drive device |
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