CN100433528C - Frequency adjusting convertor circuit with variable pulse width and its controlling method - Google Patents
Frequency adjusting convertor circuit with variable pulse width and its controlling method Download PDFInfo
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- CN100433528C CN100433528C CNB2004100912174A CN200410091217A CN100433528C CN 100433528 C CN100433528 C CN 100433528C CN B2004100912174 A CNB2004100912174 A CN B2004100912174A CN 200410091217 A CN200410091217 A CN 200410091217A CN 100433528 C CN100433528 C CN 100433528C
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Abstract
The present invention relates to a frequency adjusting type converter circuit with adjustable pulse width and a control method thereof. The converter circuit with adjustable pulse width, which is composed of a power switch driver, a power switch, a transformer unit, a feedback detecting unit and a voltage control oscillator, is electrically coupled with a direct current voltage source and drives a load to operate. The circuit can adjust the pulse width of a signal output by the power switch driver according to the voltage of an input direct current voltage source in order to keep input power received by a fluorescent tube at a fixed value and avoid the situation that the circuit has high input voltage but low efficiency output.
Description
Technical field
The present invention relates to a kind of pulse-frequency modulation circuit, particularly relate to a kind of can be according to the size of input dc power potential source voltage, adjust the FREQUENCY CONTROL formula converter circuit and the control method thereof of the adjustable variable pulse width of pulse duration.
Background technology
Cathode fluorescent tube is to belong to a kind of low-pressure mercury discharge lamp, and after the cathode fluorescent tube two ends directly added power supply, mercury electronics and gas atom can impact mutually and produce ultraviolet ray in the pipe, run into the tube wall fluorophor via ultraviolet ray again and are converted to visible light.Because cold cathode fluorescent lamp do not use filament, thus no filament blow or broke problem, so arranged very reliable useful life.
Cathode fluorescent tube is when stable operation, needed supply frequency scope is greatly about 30Kz～80KHz, the string ripple that does not contain the direct current composition, several intimate constants of the stable operation voltage of fluorescent tube, and the brightness of fluorescent tube is determined by the tube current by fluorescent tube, high about 2～2.5 times voltage when then needing stable operation than usual when starting fluorescent tube, the starting resistor of cathode fluorescent tube and operating voltage then are that the size by fluorescent tube is determined, general 14 cun, about about 1400Vrms, the operating voltage when fluorescent tube operates in maximum rated current 7mA is greatly about about 650Vrms greatly for the starting resistor of 15 cun employed cathode fluorescent tubes of LCD.
Generally speaking; typical cathode fluorescent tube is the converter that utilizes in the pulse-frequency modulation circuit; convert DC input voitage to ac output voltage; to promote cathode fluorescent tube work; and in order to keep the operating current stability of cathode fluorescent tube; usually it is poor to add resonance in the pulse-frequency modulation circuit, suitably to adjust the output current of pulse-frequency modulation circuit.
Seeing also shown in Figure 1ly, is the frequency of operation of resonant slots and the corresponding relation figure of output voltage.As shown in the figure, under different frequency of operation, the voltage that resonant slots is exported also can be not identical, and the output of resonant slots reaches maximum Vmax when incoming frequency equals the resonant slots resonance frequency.For example when the frequency of operation of cathode fluorescent tube during at F1, its output voltage is V
02, and, promptly can improve output voltage to V as long as when the frequency of operation of resonant slots downgraded more F2 near resonance frequency
01, the pulse-frequency modulation control circuit promptly utilizes this kind output size characteristic relevant with incoming frequency of resonant slots, adjusts the operating current of cathode fluorescent tube in the mode that changes operating frequency.
Seeing also shown in Figure 2ly, is a kind of circuit block diagram of existing known pulse-frequency modulation converter circuit.As shown in FIG., power switch 203 links direct voltage source 201 to resonant slots 205, input voltage is sent into transformer 207 and driven cathode fluorescent tube 209 luminous.
Cooperate aforesaid Fig. 1 to describe, when the frequency of operation of resonant slots 205 during at F1, the operating current that drives cathode fluorescent tube 209 can be less, at this moment, fluorescent tube current sense device 211 can be exported a detection signal, and (feedback is back coupling to negative feedback, below all be called feedback) controller 213, and negative feedback controller 213 can be exported a feedback voltage signal that voltage-controlled oscillator 215 frequencies are reduced, so that the oscillation signal frequency that voltage-controlled oscillator 215 is exported reduces.
The pulsewidth that the fixed power switch driver 217 of pulsewidth is exported fixedly signal frequency can be made change with the frequency of oscillation that voltage-controlled oscillator 215 is exported, therefore the frequency when oscillation signal reduces, the pulsewidth fixedly frequency of signal also can descend thereupon, makes the frequency of operation of input resonant slots 205 more reach the purpose that improves the resonance output voltage near the mode of resonant slots 205 resonance frequencys.Otherwise when big as if original cathode fluorescent tube 209 electrorheologicals in the F1 operation, then system can adjust the frequency of operation of importing resonant slots 205 becomes the frequency of operation that is higher than F1 away from one of resonant slots 205 resonance frequencys, gets off will become big electric current adjustment.
Yet, though utilize the frequency of operation that changes resonant slots 205, can adjust the operating current of cathode fluorescent tube effectively, but by knowing in the diagram of Fig. 1, more near the system of resonant slots 205 resonance frequencys, its output voltage is bigger, so efficient can be higher, and frequency of operation more can be poor more away from its efficient of system of resonance frequency.Therefore in the bigger system of the voltage range of many input dc power potential sources, if the pulse-frequency modulation circuit is when working than high input voltage, often must be able to stablize output cathode fluorescent tube electric current away from the mode of operation of resonance frequency, though this also causes the input voltage of meeting appearance circuit very high, but the very low situation of its delivery efficiency produces, the suitable economic benefit that do not meet.
This shows that above-mentioned existing pulse-frequency modulation converter circuit obviously still has inconvenience and defective, and demands urgently further being improved in structure, control method and use.In order to solve the problem that pulse-frequency modulation converter circuit and control method thereof exist, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.
Because the defective that above-mentioned existing pulse-frequency modulation converter circuit and control method thereof exist, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, and the utilization of cooperation scientific principle, actively studied innovation, FREQUENCY CONTROL formula converter circuit and control method thereof in the hope of the adjustable variable pulse width of founding a kind of new structure, can improve general existing pulse-frequency modulation converter circuit and control method thereof, make it have more practicality.Through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.
Summary of the invention
The objective of the invention is to, overcome the defective that existing pulse-frequency modulation converter circuit and control method thereof exist, and a kind of FREQUENCY CONTROL formula converter circuit and control method thereof of new adjustable variable pulse width be provided, technical problem to be solved is to make it that a kind of converter circuit of adjustable variable pulse width is provided, can be according to the size of direct voltage source input voltage, adjust the pulsewidth of the pulse signal that the power switch driver is exported in the circuit, to avoid circuit high input voltage to occur but the result of inefficient output, thereby be suitable for practicality more.
A further object of the present invention is exactly the control method at the converter circuit that a kind of adjustable variable pulse width is provided, it can be according to the size of direct voltage source input voltage, adjust the pulsewidth of pulse width modulation signal, to avoid circuit high input voltage to occur but the result of inefficient output, thereby be suitable for practicality more.
The object of the invention to solve the technical problems realizes by the following technical solutions.
The FREQUENCY CONTROL formula converter circuit of a kind of adjustable variable pulse width that proposes according to the present invention, it comprises: a direct current voltage source; One power switch driver, this power switch driver is exported a pulse width modulation signal according to the voltage of this direct voltage source; One power switch, have one first end, one second end and one the 3rd end, this of this power switch first end is this direct voltage source of electric property coupling, this of this power switch second end is in order to receive this pulse width modulation signal, and the 3rd end of this power switch is whether to export the signal of a conducting to this direct voltage source according to this pulse width modulation signal decision; One transformer unit has an input and an output, and this input of this transformer unit is in order to receive the signal of this conducting to direct voltage source, and this output of this transformer is to export a change of current signal according to this conducting to the signal of direct voltage source; One load has an input and an output, and this input of this load is in order to receiving this change of current signal, and makes this change of current signal flow to this output of this load from this input of this load; One detecting unit, this detecting unit is detected the operating conditions of this load, and the output adjustable throttle is through a FEEDBACK CONTROL signal of this change of current signal of this load, and a load conducting signal of indicating this load conduction status; One oscillator, this oscillator receives this FEEDBACK CONTROL signal, and export an oscillation signal according to this FEEDBACK CONTROL signal, this FEEDBACK CONTROL signal determines the frequency of this oscillation signal, this oscillation signal is coupled to this power switch driver, in order to determine the frequency of this pulse width modulation signal that this power switch driver is exported; When one system starting device, this system starting device started at this converter circuit at every turn, forcing this FEEDBACK CONTROL signal was a preset value, so that this oscillator is exported the oscillation signal of a predeterminated frequency; And a protective device, this protective device receives and according to this load conducting signal, whether decision changes this pulse width modulation signal.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The FREQUENCY CONTROL formula converter circuit of aforesaid adjustable variable pulse width, wherein when the magnitude of voltage of this direct voltage source becomes big, the pulsewidth of this pulse width modulation signal will reduce relatively, and when the magnitude of voltage of this direct voltage source diminished, the pulsewidth of this pulse width modulation signal will increase relatively.
The FREQUENCY CONTROL formula converter circuit of aforesaid adjustable variable pulse width, wherein said detecting unit more comprises: a load operation detector, this load operation detector is detected this load operation situation, and exports this load conducting signal, and the flow through feedback voltage signal of this load current of an indication; And a negative feedback controller, this negative feedback controller receives this indication feedback voltage signal of this load current of flowing through, and exports this FEEDBACK CONTROL signal.
The FREQUENCY CONTROL formula converter circuit of aforesaid adjustable variable pulse width, wherein said load is a fluorescent tube.
The FREQUENCY CONTROL formula converter circuit of a kind of adjustable variable pulse width that proposes according to the present invention, it comprises: a direct current voltage source; One power switch driver, this power switch driver is according to the different pulse signal of voltage swing different output one pulsewidth of this direct voltage source; One power switch, have one first end, one second end and one the 3rd end, this of this power switch first end is this direct voltage source of electric property coupling, this of this power switch second end is in order to receive this pulse signal, and the 3rd end of this power switch is whether to export a conducting to the direct voltage source signal according to this pulse signal decision; One transformer unit has an input and an output, and this input of this transformer unit is in order to receive this conducting to the direct voltage source signal, and this output of this transformer is to export a change of current signal according to this conducting to direct voltage source signal; One fluorescent tube has an input and an output, and this input of this fluorescent tube is in order to receiving this change of current signal, and makes this change of current signal flow to this output of this fluorescent tube from this input of this fluorescent tube; One detecting unit, this detecting unit are detected this fluorescent tube operating conditions, and the output adjustable throttle is through a FEEDBACK CONTROL signal of this change of current signal of this fluorescent tube, and a fluorescent tube conducting signal of indication fluorescent tube conduction status; One oscillator, this oscillator receives this FEEDBACK CONTROL signal, and export an oscillation signal according to this FEEDBACK CONTROL signal, and determine the frequency of this oscillation signal, this oscillation signal to couple the operating frequency of this power switch driver with this pulse signal of determining this power switch driver output by this FEEDBACK CONTROL signal; One system starting device, this starting drive can make the FREQUENCY CONTROL formula converter circuit of this adjustable variable pulse width when each the startup, and forcing this FEEDBACK CONTROL signal is a preset value, so that this oscillator is exported the oscillation signal of a predeterminated frequency; One protective circuit, this protective circuit changes this pulse signal that this power switch driver is exported according to this fluorescent tube conducting signal decision; And a dimming function starting drive, this dimming function starting drive receives and according to this fluorescent tube conducting signal, exports a brightness adjustment control signal to this power switch driver and this detecting unit.
The FREQUENCY CONTROL formula converter circuit of aforesaid adjustable variable pulse width, wherein when this dimming function starting drive did not start, the FREQUENCY CONTROL formula converter circuit of this adjustable variable pulse width produced a default maximum output.
The FREQUENCY CONTROL formula converter circuit of aforesaid adjustable variable pulse width wherein utilizes the clock pulse of LCD to produce described brightness adjustment control signal.
The control method of the FREQUENCY CONTROL formula converter circuit of a kind of adjustable variable pulse width that proposes according to the present invention, the converter circuit of this adjustable variable pulse width comprises a direct current voltage source and a load, and it comprises: export a pulse width modulation signal according to the voltage swing of this direct voltage source; Whether export the signal of this direct voltage source of conducting according to this pulse width modulation signal decision; Export a change of current signal according to this conducting to the signal of this direct voltage source; This change of current signal is in order to driving this loaded work piece, and according to working condition output one indication of this load flow through the feedback voltage signal of electric current of this load and a load conducting signal of this load conduction status of indication; Export a FEEDBACK CONTROL signal and whether change this pulse width modulation signal with decision according to this feedback voltage signal according to this load conducting signal; And export an oscillation signal according to this FEEDBACK CONTROL signal; Wherein, the frequency of oscillation of this pulse width modulation signal is by this oscillation signal decision.
The control method of the FREQUENCY CONTROL formula converter circuit of aforesaid adjustable variable pulse width, wherein when this FEEDBACK CONTROL signal changed, the frequency of oscillation that this oscillation signal is exported was with regard to corresponding change.
The control method of the FREQUENCY CONTROL formula converter circuit of aforesaid adjustable variable pulse width, wherein when the magnitude of voltage of this direct voltage source became big, the pulsewidth of this pulse width modulation signal just reduced relatively.When the magnitude of voltage of this direct voltage source diminished, the pulsewidth of this pulse width modulation signal just increased relatively.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, in order to reach aforementioned goal of the invention, major technique of the present invention thes contents are as follows:
The present invention proposes a kind of converter circuit, comprises direct voltage source, power switch driver, power switch, transformer unit, load, detecting unit, oscillator, system starting device and protective device.Wherein, above-mentioned power switch driver is according to the voltage of direct voltage source, output pulse width modulation signal.Above-mentioned power switch has first end, second end and the 3rd end, first end of power switch is the electric property coupling direct voltage source, second end of power switch is in order to receive pulse width modulation signal, and the 3rd end of power switch is that whether decision exports the signal of a conducting to direct voltage source according to pulse width modulation signal.
Above-mentioned transformer unit has an input and an output, and the input of transformer is in order to receive the signal of aforesaid conducting to direct voltage source, and the output of transformer is to export a change of current signal according to aforesaid conducting to the signal of direct voltage source.Above-mentioned load has an input and an output, and the input of load is in order to receiving change of current signal, and makes change of current signal flow to this output of load from the input of load.
The operating conditions of above-mentioned detecting unit detecting load, the output adjustable throttle is through the FEEDBACK CONTROL signal of the change of current signal of load, and load conducting signal.Above-mentioned oscillator receives the FEEDBACK CONTROL signal, and according to FEEDBACK CONTROL signal output oscillation signal, wherein, the frequency of FEEDBACK CONTROL signal decision oscillation signal, and oscillation signal is coupled to the power switch driver, in order to determine the frequency of the pulse width modulation signal that the power switch driver is exported.
Above-mentioned system starting device can make converter circuit when each the startup, and forcing the FEEDBACK CONTROL signal is a preset value, so that oscillator is exported the oscillation signal of a predeterminated frequency.Above-mentioned protective device receives and according to load conducting signal, whether decision closes this pulse width modulation signal, makes power switch change conducting state.
According to the described converter circuit of preferred embodiment of the present invention, when wherein the FEEDBACK CONTROL signal of exporting when detecting unit diminished, the frequency of operation of the oscillation signal that oscillator is exported also can correspondingly reduce.And the FEEDBACK CONTROL signal of exporting when detecting unit is when becoming big, and the frequency of operation of the oscillation signal that oscillator is exported also can correspondingly increase.
According to the described converter circuit of preferred embodiment of the present invention, wherein when the magnitude of voltage of direct voltage source became big, the pulsewidth of pulse width modulation signal also can reduce relatively.And when the magnitude of voltage of direct voltage source diminished, the pulsewidth of pulse width modulation signal also can increase relatively.
According to the described converter circuit of preferred embodiment of the present invention, wherein detecting unit more comprises load operation detector and negative feedback controller, wherein the load operation detector is detected the operating conditions of load, and output loading conducting signal, and the flow through feedback voltage signal of load current of an indication.Above-mentioned feedback controller receives the feedback voltage signal of indicating the load current of flowing through, and output FEEDBACK CONTROL signal.
According to the described converter circuit of preferred embodiment of the present invention, wherein converter circuit more comprises a light modulating device and a dimming function starting switch, this dimming function starting switch receives and according to load conducting signal, and the light modulation signal that decision output produces from light modulating device is to power switch driver and negative feedback controller.In addition, in the present embodiment, when dimming function was not activated, converter circuit can be exported a default maximum power output.
According to the described converter circuit of preferred embodiment of the present invention, wherein transformer unit comprises resonant slots and transformer.Wherein, resonant slots receives and according to the signal of conducting to direct voltage source, export resonance groove output signal.Above-mentioned transformer has an input and an output, and the input of transformer is in order to receive the resonant slots output signal, and the output of transformer is according to resonant slots output signal output change of current signal.
According to the described converter circuit of preferred embodiment of the present invention, wherein power switch is metal-oxide-semifield-effect electric crystal (MOSFET), transformer unit is made of a piezoelectric ceramics transformer, the power switch driver is a pulse-width modulation formula power switch driver, and oscillator is a voltage-controlled oscillator.
From another viewpoint, the present invention proposes a kind of control method of converter circuit of adjustable variable pulse width in addition, in the method, the converter circuit of adjustable variable pulse width is to be electrically coupled to direct voltage source and to drive a loaded work piece, and wherein this control method comprises the following steps: the voltage swing output pulse width modulation signal according to direct voltage source; The conducting that decision is exported according to pulse width modulation signal is to the signal of direct voltage source; According to the signal output change of current signal of conducting to direct voltage source; Change of current signal is in order to driving loaded work piece, and according to the working condition output services usefulness signal of load; According to task performance signal output feedback signal; According to FEEDBACK CONTROL signal output oscillation signal, wherein, the frequency of oscillation of pulse width modulation signal is to be determined by oscillation signal.
According to the control method of the converter circuit of the described adjustable variable pulse width of preferred embodiment of the present invention, wherein when the task performance signal diminished, oscillation signal can corresponding reduction.Otherwise, when the task performance signal becomes big, the also corresponding increase of oscillation signal.
According to the control method of the converter circuit of the described adjustable variable pulse width of preferred embodiment of the present invention, wherein when the magnitude of voltage of direct voltage source became big, the pulsewidth of pulse width modulation signal can reduce relatively.Otherwise when the magnitude of voltage of direct voltage source diminished, the pulsewidth of pulse width modulation signal also increased relatively.
In sum, according to the converter circuit of adjustable variable pulse width proposed by the invention, it can adjust the pulsewidth of the pulse signal that the pulse-width modulation power switch driver circuit is exported in the circuit according to the size of direct voltage source input voltage.When the direct voltage source input voltage is higher, can adjust the pulsewidth of pulse signal, reduce the input electric power of load, avoid the frequency of oscillation of resonant slots too much, thereby reduce the whole efficiency of circuit away from resonance frequency
Via as can be known above-mentioned, the invention relates to a kind of FREQUENCY CONTROL formula converter circuit and control method thereof of adjustable variable pulse width, the converter circuit of this adjustable variable pulse width, being made up of power switch driver, power switch, transformer unit, feedback detecting unit and voltage-controlled oscillator, is to be electrically coupled to direct voltage source and to drive a loaded work piece.This circuit can be according to the voltage swing of input dc power potential source, the pulsewidth size of the signal that adjustment power switch driver is exported, allow the received input power of glimmering outstanding fluorescent tube can maintain definite value, avoid circuit high input voltage to occur but the situation of inefficient output.
By technique scheme, the FREQUENCY CONTROL formula converter circuit and the control method thereof of the adjustable variable pulse width of the present invention have following advantage at least:
Converter circuit according to adjustable variable pulse width proposed by the invention, it is except being retained in the traditional circuit, current work size according to load cooperates resonant slots to adjust the mode of oscillation signal operating frequency, make the load can be outside working under the stable electric current, when the direct voltage source input voltage becomes big, the pulsewidth size of pulsewidth signal in more can automatic circuit, allow the received signal of resonant slots, the average power of its input electric power is to maintain near certain value, so can allow resonant slots as far as possible in resonance frequency work, allow circuit avoid high input voltage occurring but the situation of inefficient output near itself.
In sum, the FREQUENCY CONTROL formula converter circuit and the control method thereof of the adjustable variable pulse width of the present invention, a kind of converter circuit of adjustable variable pulse width is provided, it can be according to the size of direct voltage source input voltage, adjust the pulsewidth of the pulse signal that the power switch driver is exported in the circuit, to avoid circuit high input voltage to occur but the result of inefficient output.The present invention also provides a kind of control method of converter circuit of adjustable variable pulse width in addition, and it can be according to the size of direct voltage source input voltage, adjusts the pulsewidth of pulse width modulation signal, to avoid circuit high input voltage to occur but the result of inefficient output.It has above-mentioned many advantages and practical value, and in like product and method, do not see have similar structural design and method to publish or use and really genus innovation, no matter it all has bigger improvement on product structure, method or function, have large improvement technically, and produced handy and practical effect, and more existing pulse-frequency modulation converter circuit and control method thereof have the multinomial effect of enhancement, thereby being suitable for practicality more, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by a preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the frequency of operation of existing resonant slots and the corresponding relation figure of output voltage.
Fig. 2 is a kind of circuit block diagram that has the known fixed converter circuit of pulse frequency now.
Fig. 3 is the circuit block diagram according to converter circuit proposed by the invention.
Fig. 4 is the pulsewidth comparison diagram according to the input of the power switch of converter circuit proposed by the invention and output.
Fig. 5 is the circuit diagram according to the internal circuit of converter circuit proposed by the invention.
Fig. 6 be according to the another kind of internal circuit in the inside of converter circuit proposed by the invention circuit diagram.
Fig. 7 is the flow chart according to the control method of the converter circuit of a kind of adjustable variable pulse width proposed by the invention.
201,301: direct voltage source
203,303: power switch
205,305: resonant slots
207,307: transformer
209,309: fluorescent tube
211: fluorescent tube current sense device
311: the load operation detector
213,313: the negative feedback controller
215,315: voltage-controlled oscillator
217,317: pulse-width modulation formula power switch driver
319: transformer unit
321: the feedback detecting unit
350: the system start-up input signal
352: protective device
356: feedback conducting signal
358: the feedback voltage signal
359: the FEEDBACK CONTROL signal
360: oscillation signal
362: the protection controlling signal
370: the brightness adjustment control signal
372: the dimming function starting switch
374: light modulating device
380: system starting device
612,614,712:P type metal-oxide-semifield-effect electric crystal
616,618,714:N type metal-oxide-semifield-effect electric crystal
624: the coiling transformer
622,626: resonant capacitance
632,732: pulse width modulation signal
652,752: conducting direct voltage source signal
724: piezoelectric ceramics formula transformer
722: resonant capacitance
S501: output pulse width modulation signal
S503: the signal of output conducting direct voltage source
S 505: output change of current signal
S507: output services usefulness signal
S509: output FEEDBACK CONTROL signal
S511: output oscillation signal
F1, F2: frequency of operation
V
01, V
02: output voltage
A: the input of power switch
B: the output of power switch
A1, A2: pulse width modulation signal
B1, B2: conducting signal
Vmax: maximum voltage value
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, FREQUENCY CONTROL formula converter circuit and its embodiment of control method, structure, method, step, feature and the effect thereof of the adjustable variable pulse width that foundation the present invention is proposed, describe in detail as after.
Seeing also shown in Figure 3ly, is the circuit block diagram according to converter circuit proposed by the invention.As shown in FIG., embodiments of the invention and traditional maximum difference of converter circuit, the fixed power switch driver of pulsewidth with script in the traditional circuit changes pulse-width modulation formula power switch driver 317 into exactly, simultaneously this pulse-width modulation formula power switch driver 317 can receive and according to the voltage swing of direct voltage source 301, decide the pulsewidth width of its output.
When circuit is started working, pulse-width modulation formula power switch driver 317 is after receiving direct voltage source 301, can be according to the voltage swing of direct voltage source 301, output pulse width modulation signal, and power switch 303 can determine the ON time of itself according to the pulsewidth of pulse width modulation signal, and in the ON time of power switch 317, export the signal of a conducting, be sent to transformer unit 319 with voltage with direct voltage source 301 to direct voltage source 301.
In the present embodiment, transformer unit 319 more comprises resonant slots 305 and transformer 307, and is the same with traditional circuit, and resonant slots 305 can be according to the operating frequency of its received signal, the electric power size of the resonant slots output signal that decision itself is exported.Because load in the present embodiment 309 must drive with the AC wave that does not contain the direct current composition, therefore transformer 307 is after receiving the resonant slots output signal that is transmitted into by resonant slots 305, the resonant slots output signal of direct current pattern can be converted to the change of current signal of alternating current pattern, to promote load 309 work.In the present embodiment, the load 309 in this converter circuit is cathode fluorescent tubes.
In the present embodiment, detecting unit 321 is made up of load operation detector 311 and negative feedback controller 313.Wherein, load operation detector 311 is responsible for the operating conditions of detecting cathode fluorescent tube 309, and output indicates a feedback voltage signal 358 of cathode fluorescent tube 309 electric currents of flowing through to negative feedback controller 313.And FEEDBACK CONTROL signal 359 sizes that 313 meetings of negative feedback controller decide its output to export according to this feedback voltage signal 358 are last, and oscillator 315 can determine the frequency of the oscillation signal 360 of its output according to the size of FEEDBACK CONTROL signal 359.And in the present embodiment, oscillator 315 is voltage-controlled oscillators.
In the present embodiment, when the voltage decreases of direct voltage source 301, the corresponding reduction of operating current meeting of cathode fluorescent tube 309, load operation detector 311 can be sent an indication and flowed through the feedback voltage signal 358 of cathode fluorescent tube 309 electric currents to negative feedback controller 313 this moment, informed that negative feedback controller 313 will reduce the signal value of the FEEDBACK CONTROL signal 359 that output exports.When voltage-controlled oscillator 315 received FEEDBACK CONTROL signals 359 reduced, the frequency of the oscillation signal 360 of its output also can and then reduce.
And the operating frequency of the pulse width modulation signal that pulse-width modulation formula power switch driver 317 is exported, can be along with the oscillation signal 360 that voltage-controlled oscillator 315 is exported is made change, as previously mentioned, when the frequency of oscillation signal 360 reduces, when the operating frequency of pulse width modulation signal also can and then reduce, this moment resonant slots 305 the accent pulse width modulation signal that is received, its frequency of oscillation can be more near the resonance frequency of resonant slots 305 itself, make the output power of resonant slots 305 to promote, to improve the operating current of cathode fluorescent tube 309.
Otherwise, if according to aforesaid mode, when the voltage of direct voltage source 301 becomes big, then the operating frequency of pulse width modulation signal also can and then improve, thereby away from the resonance frequency of resonant slots 305, make the electric power output of resonant slots 305 to reduce, also therefore can make circuit high input voltage occur but the situation of inefficient output.
But because the pulse-width modulation formula power switch driver 317 in the present embodiment, can according to direct voltage source 301 voltage swing adjust the pulsewidth of pulse width modulation signal, when the voltage of direct voltage source 301 is healed when big, the pulsewidth of its pulse width modulation signal also can be littler, to reduce the electric power of input resonant slots 305.Therefore, when load operation detector 311 is detected the electric current of the fluorescent tube 309 of flowing through, just can not become big because of the voltage of direct voltage source 301 and and then increase, so promptly can allow the frequency of the oscillation signal 360 that resonant slots 305 exported, maintain near the resonance frequency of resonant slots 305 as far as possible.
In addition, also comprise a system starting device 380 in the present embodiment, this system starting device 380 can output system start input signal 350 to negative feedback controller 313, to force negative feedback controller 313 when converter circuit starts at every turn, the FEEDBACK CONTROL signal 359 that capital output one is default, the output that makes voltage control swing device 315 be one default away from and be higher than the oscillation signal 360 of resonant slots 305 resonance frequencys.Such benefit is that cathode fluorescent tube 309 each startups all are that electric power output from childhood becomes greatly more gradually.
In the present embodiment, more comprise a protective device 352.Load operation detector 311 can be detected the operating conditions of cathode fluorescent tube 309; and can send indication cathode fluorescent tube 309 fluorescent tubes whether the load conducting signal 356 of conducting to protective device 352; protective device 352 is according to this load conducting signal 356 decision outputs one protection controlling signal 362; to change the output of pulse-width modulation formula power switch driver 317, make power switch 303 stop conductings.
In the application of reality, protective device 352 can cooperate a timer operation, generally is default one section usefulness of lighting for cathode fluorescent tube 309 start-up time.Protective device 352 does not temporarily act in the burning time of this section beginning, once operated predetermined burning time, protective device 352 just can be had an effect.
In addition, more comprise light modulating device 374 and dimming function starting switch 372 in the present embodiment, light modulating device 374 can be exported a light modulation signal 370 to dimming function starting switch 372, and see through dimming function starting switch 372 the light modulation signal is exported in negative feedback controller 313 and the pulse-width modulation formula power switch driver 317, by changing pulse width modulation signal and FEEDBACK CONTROL signal 359 simultaneously, to reach the brightness of adjusting cathode fluorescent tube 309.Wherein, dimming function starting switch 372 is to determine whether conducting light modulation signal 370 according to whether receiving load conducting signal 356.
By guaranteeing that cathode fluorescent tube 309 can be lighted by enough electric power, light modulation signal 370 is just to begin to send into the device described in the present embodiment after the 356 indication fluorescent tube conductings of load conducting signal in the present embodiment.Brightness adjustment control output signal 370 can be that galvanic current is pressed signal in general application, also can be the mode light modulation of the pulse of a low frequency with the 309 light and shade fast blinks of cold cathode control fluorescent tube.Experience less than flicker for the eye that makes the people, frequency is more than the 200Hz usually, and more can utilize the clock pulse of display to produce this brightness adjustment control output signal 370 to reduce interference in LCD (LCD) application.And lighted in order to ensure cathode fluorescent tube 309; before cathode fluorescent tube 309 is lighted; except not carrying out the light modulation, also can design an enough voltage output to light cathode fluorescent tube 309 usually according to lighting cathode fluorescent tube 309 needed voltages.
Please consult Fig. 3 and shown in Figure 4 simultaneously, Fig. 4 be the input of power switch 303 and output voltage peak pulse duration.As shown in FIG., when the voltage of being exported when direct voltage source 301 is low, after the processing through pulse-width modulation formula power switch driver 317, the received input signal of the input A of power switch 303 is pulse width modulation signal A1, and the pulsewidth of the conducting direct voltage source signal B1 that its output B is exported can be the same with the pulse width modulation signal A1 that input A is received.
Otherwise, when the voltage of being exported when direct voltage source 301 is higher, after 317 processing of pulse-width modulation formula power switch driver, the received input signal of the input A of power switch 303 can be pulse width modulation signal A2, because the magnitude of voltage that DC source voltage source 301 is exported is higher, so and pulse width modulation signal A1 by comparison, the pulsewidth size of pulse width modulation signal A2 shown in the figure can be narrower, and the conducting direct voltage source signal of the output resonant slots that B is sent to of power switch 303, though its magnitude of voltage is higher, relative pulsewidth also can be narrower.
Therefore, though received conducting direct voltage source signal magnitude of voltage and the pulsewidth of resonant slots 305 is neither identical, but the operating frequency and the average power of its conducting direct voltage source signal are identical, thus, no matter the magnitude of voltage of direct voltage source 301 uprises or step-down, can allow the power switch 303 of converter circuit control of adjustable variable pulse width can be as far as possible under resonance frequency, work near itself resonant slots 305, circuit can be operated under more high efficiency situation, avoid occurring situation as described above, high input voltage can occur but the situation of inefficient output.
See also shown in Figure 5ly, it is the circuit diagram according to the internal circuit of this bright converter circuit that proposes.As shown in FIG., direct voltage source 301 is couple to power switch 303, and power switch 303 is by two P type MOSFET (P type metal-oxide-semifield-effect electric crystal) 612,614, and 616,618 formations of two N type MOSFET (N type metal-oxide-semifield-effect electric crystal).To direct voltage source signal 652, being input to transformer unit 319, and transformer unit 319 is to be made of coiling transformer 624, resonant capacitance 622 and 626 to power switch 303 by pulse width modulation signal 632 control output conductings.
See also shown in Figure 6ly, it is the circuit diagram according to the another kind of internal circuit in inside of this bright converter circuit that proposes.As shown in FIG., direct voltage source 301 is couple to power switch 303, and power switch 303 is by 714 formations of 712 and N type MOSFET of a P type MOSFET (P type metal-oxide-semifield-effect electric crystal) (N type metal-oxide-semifield-effect electric crystal).Power switch 303 is by pulse width modulation signal 732 control output conducting direct voltage source signals 752, and being input in the transformer unit 319, and this transformer unit 319 is made of piezoelectric ceramics formula transformer 724, resonant inductance 722.
See also shown in Figure 7ly, it is the flow chart according to the control method of the converter circuit of adjustable variable pulse width proposed by the invention.The converter circuit of this adjustable variable pulse width is to be electrically coupled to direct voltage source and to drive a loaded work piece, as shown in FIG., in step S501, the voltage swing that the converter circuit of this adjustable variable pulse width can be exported according to direct voltage source, export a pulse width modulation signal, wherein in the present embodiment, the variation that can be inversely proportional to the voltage swing of direct voltage source of the pulsewidth of pulse width modulation signal, heal greatly when voltage, its pulsewidth can be littler.
In step S503, the converter circuit of adjustable variable pulse width can determine whether exporting a conducting direct voltage source signal according to pulse width modulation signal.In step S505, the converter circuit of adjustable variable pulse width then can decide the change of current signal size of its output according to the operating frequency of conducting direct voltage source signal, in the present embodiment, when the operating frequency of conducting direct voltage source signal is higher, the change of current signal of its output can relative diminishing.In step S507, work is carried out in the load that change of current signal can drive in the converter circuit of adjustable variable pulse width, and export a task performance signal according to the operating current of load, wherein this task performance signal comprises an indication flow through the feedback voltage signal of electric current of this load and a load conducting signal of this load conduction status of indication.
In step S509, export a FEEDBACK CONTROL signal according to aforesaid feedback voltage signal.In step S511, according to FEEDBACK CONTROL signal output oscillation signal, wherein, at the pulse width modulation signal described in the step 501, the operating frequency of its signal then can change according to the frequency of oscillation of oscillation signal again.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the method that can utilize above-mentioned announcement and technology contents are made a little change or be modified to the equivalent embodiment of equivalent variations, but every content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (10)
1, a kind of FREQUENCY CONTROL formula converter circuit of adjustable variable pulse width is characterized in that it comprises:
One direct current voltage source;
One power switch driver, this power switch driver is exported a pulse width modulation signal according to the voltage of this direct voltage source;
One power switch, have one first end, one second end and one the 3rd end, this of this power switch first end is this direct voltage source of electric property coupling, this of this power switch second end is in order to receive this pulse width modulation signal, and the 3rd end of this power switch is whether to export the signal of a conducting to this direct voltage source according to this pulse width modulation signal decision;
One transformer unit has an input and an output, and this input of this transformer unit is in order to receive the signal of this conducting to direct voltage source, and this output of this transformer is to export a change of current signal according to this conducting to the signal of direct voltage source;
One load has an input and an output, and this input of this load is in order to receiving this change of current signal, and makes this change of current signal flow to this output of this load from this input of this load;
One detecting unit, this detecting unit is detected the operating conditions of this load, and the output adjustable throttle is through a FEEDBACK CONTROL signal of this change of current signal of this load, and a load conducting signal of indicating this load conduction status;
One oscillator, this oscillator receives this FEEDBACK CONTROL signal, and export an oscillation signal according to this FEEDBACK CONTROL signal, this FEEDBACK CONTROL signal determines the frequency of this oscillation signal, this oscillation signal is coupled to this power switch driver, in order to determine the frequency of this pulse width modulation signal that this power switch driver is exported;
When one system starting device, this system starting device started at this converter circuit at every turn, forcing this FEEDBACK CONTROL signal was a preset value, so that this oscillator is exported the oscillation signal of a predeterminated frequency; And
One protective device, this protective device receive and according to this load conducting signal, whether decision changes this pulse width modulation signal.
2, the FREQUENCY CONTROL formula converter circuit of adjustable variable pulse width according to claim 1, it is characterized in that wherein when the magnitude of voltage of this direct voltage source becomes big, the pulsewidth of this pulse width modulation signal will reduce relatively, when the magnitude of voltage of this direct voltage source diminished, the pulsewidth of this pulse width modulation signal will increase relatively.
3, the FREQUENCY CONTROL formula converter circuit of adjustable variable pulse width according to claim 1 is characterized in that wherein said detecting unit more comprises:
One load operation detector, this load operation detector is detected this load operation situation, and exports this load conducting signal, and the flow through feedback voltage signal of this load current of an indication; And
One negative feedback controller, this negative feedback controller receive this indication feedback voltage signal of this load current of flowing through, and export this FEEDBACK CONTROL signal.
4, the FREQUENCY CONTROL formula converter circuit of adjustable variable pulse width according to claim 1 is characterized in that wherein said load is a fluorescent tube.
5, a kind of FREQUENCY CONTROL formula converter circuit of adjustable variable pulse width is characterized in that it comprises:
One direct current voltage source;
One power switch driver, this power switch driver is according to the different pulse signal of voltage swing different output one pulsewidth of this direct voltage source;
One power switch, have one first end, one second end and one the 3rd end, this of this power switch first end is this direct voltage source of electric property coupling, this of this power switch second end is in order to receive this pulse signal, and the 3rd end of this power switch is whether to export a conducting to the direct voltage source signal according to this pulse signal decision;
One transformer unit has an input and an output, and this input of this transformer unit is in order to receive this conducting to the direct voltage source signal, and this output of this transformer is to export a change of current signal according to this conducting to direct voltage source signal;
One fluorescent tube has an input and an output, and this input of this fluorescent tube is in order to receiving this change of current signal, and makes this change of current signal flow to this output of this fluorescent tube from this input of this fluorescent tube;
One detecting unit, this detecting unit are detected this fluorescent tube operating conditions, and the output adjustable throttle is through a FEEDBACK CONTROL signal of this change of current signal of this fluorescent tube, and a fluorescent tube conducting signal of indication fluorescent tube conduction status;
One oscillator, this oscillator receives this FEEDBACK CONTROL signal, and export an oscillation signal according to this FEEDBACK CONTROL signal, and determine the frequency of this oscillation signal, this oscillation signal to couple the operating frequency of this power switch driver with this pulse signal of determining this power switch driver output by this FEEDBACK CONTROL signal;
One system starting device, this starting drive can make the FREQUENCY CONTROL formula converter circuit of this adjustable variable pulse width when each the startup, and forcing this FEEDBACK CONTROL signal is a preset value, so that this oscillator is exported the oscillation signal of a predeterminated frequency;
One protective circuit, this protective circuit changes this pulse signal that this power switch driver is exported according to this fluorescent tube conducting signal decision; And
One dimming function starting drive, this dimming function starting drive receive and according to this fluorescent tube conducting signal, export a brightness adjustment control signal to this power switch driver and this detecting unit.
6, the FREQUENCY CONTROL formula converter circuit of adjustable variable pulse width according to claim 5 is characterized in that wherein when this dimming function starting drive does not start, and the FREQUENCY CONTROL formula converter circuit of this adjustable variable pulse width produces a default maximum output.
7, the FREQUENCY CONTROL formula converter circuit of adjustable variable pulse width according to claim 5 is characterized in that wherein utilizing the clock pulse of LCD to produce described brightness adjustment control signal.
8, a kind of control method of FREQUENCY CONTROL formula converter circuit of adjustable variable pulse width, the FREQUENCY CONTROL formula converter circuit of this adjustable variable pulse width comprises a direct current voltage source and a load, it is characterized in that control method comprises:
Export a pulse width modulation signal according to the voltage swing of this direct voltage source;
Whether export the signal of a conducting according to this pulse width modulation signal decision to this direct voltage source;
Export a change of current signal according to this conducting to the signal of this direct voltage source;
This change of current signal is in order to driving this loaded work piece, and according to working condition output one indication of this load flow through the feedback voltage signal of electric current of this load and a load conducting signal of this load conduction status of indication;
According to this feedback voltage signal export a FEEDBACK CONTROL signal and according to this load conducting signal with decision this pulse width modulation signal whether; And
Export an oscillation signal according to this feedback system signal;
Wherein, the frequency of oscillation of this pulse width modulation signal is by this oscillation signal decision.
9, the control method of the FREQUENCY CONTROL formula converter circuit of adjustable variable pulse width according to claim 8 is characterized in that wherein the frequency of oscillation that this oscillation signal is exported will correspondingly change when this FEEDBACK CONTROL signal changes.
10, the control method of the FREQUENCY CONTROL formula converter circuit of adjustable variable pulse width according to claim 8 is characterized in that wherein when the magnitude of voltage of this direct voltage source became big, the pulsewidth of this pulse width modulation signal will reduce relatively.When the magnitude of voltage of this direct voltage source diminished, the pulsewidth of this pulse width modulation signal will increase relatively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100912174A CN100433528C (en) | 2004-11-17 | 2004-11-17 | Frequency adjusting convertor circuit with variable pulse width and its controlling method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100912174A CN100433528C (en) | 2004-11-17 | 2004-11-17 | Frequency adjusting convertor circuit with variable pulse width and its controlling method |
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| CN1780133A CN1780133A (en) | 2006-05-31 |
| CN100433528C true CN100433528C (en) | 2008-11-12 |
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| CNB2004100912174A Expired - Fee Related CN100433528C (en) | 2004-11-17 | 2004-11-17 | Frequency adjusting convertor circuit with variable pulse width and its controlling method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101707848B (en) * | 2009-04-17 | 2012-10-03 | 海洋王照明科技股份有限公司 | Self-adaptive power matching circuit of fluorescent lamp and method |
| CN112309309B (en) * | 2019-07-25 | 2021-08-06 | 米彩股份有限公司 | Display driving module, control method thereof and display driving system |
| CN113808546B (en) * | 2021-09-14 | 2023-09-01 | Tcl华星光电技术有限公司 | Light source driving circuit and light source driving method of display panel |
| CN115118294B (en) * | 2022-08-05 | 2024-06-14 | 中国科学技术大学 | Digital isolator based on self-adaptive frequency control |
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| JPH08149850A (en) * | 1994-11-25 | 1996-06-07 | Tokin Corp | Voltage converter |
| CN1160947A (en) * | 1995-12-26 | 1997-10-01 | 株式会社东金 | Phase-reversal circuit |
| US5886477A (en) * | 1997-05-27 | 1999-03-23 | Nec Corporation | Driver of cold-cathode fluorescent lamp |
| CN1246986A (en) * | 1997-02-06 | 2000-03-08 | 太平洋水泥株式会社 | Control circuit and method for piezoelectric transformer |
| CN1368789A (en) * | 1999-11-09 | 2002-09-11 | 凹凸科技国际股份有限公司 | High-effiicent adaptive DC/AC converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08149850A (en) * | 1994-11-25 | 1996-06-07 | Tokin Corp | Voltage converter |
| CN1160947A (en) * | 1995-12-26 | 1997-10-01 | 株式会社东金 | Phase-reversal circuit |
| CN1246986A (en) * | 1997-02-06 | 2000-03-08 | 太平洋水泥株式会社 | Control circuit and method for piezoelectric transformer |
| US5886477A (en) * | 1997-05-27 | 1999-03-23 | Nec Corporation | Driver of cold-cathode fluorescent lamp |
| CN1368789A (en) * | 1999-11-09 | 2002-09-11 | 凹凸科技国际股份有限公司 | High-effiicent adaptive DC/AC converter |
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