CN101369777A - Power control circuit and electronic ballast with the same - Google Patents
Power control circuit and electronic ballast with the same Download PDFInfo
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- CN101369777A CN101369777A CNA200710140452XA CN200710140452A CN101369777A CN 101369777 A CN101369777 A CN 101369777A CN A200710140452X A CNA200710140452X A CN A200710140452XA CN 200710140452 A CN200710140452 A CN 200710140452A CN 101369777 A CN101369777 A CN 101369777A
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Abstract
The invention relates to a power control circuit and an electric stabilizer with the same. the power control circuit, which can regulate power effectively, includes a load circuit, a power switch unit, a voltage detecting unit, an error amplifier, a current detecting unit, a comparator and a drive die set, wherein the load circuit being connected with loads and outputting an output voltage; the power switch unit receiving an input voltage to provide for the load circuit in switch; the voltage detecting unit detecting the output voltage and generating a first voltage signal; the error amplifier receiving the first voltage signal and a reference voltage, and outputting a second voltage signal; the current detecting unit detecting the current across the power switch unit and generating a third voltage signal; the comparator comparing the second and the third voltage signals; the drive die set generating a drive signal based on the comparative result of the comparator; the driver power switch unit switching, controlling and providing a load power. The electric stabilizer includes a power control circuit, a rectification circuit and a commutation circuit. The invention can regulate power instantly, and saves cost and is suitable for high illumination intensity air discharge lamp.
Description
Technical field
The present invention relates to a kind of power control circuit and have the electric stabilizer of this power control circuit, particularly relate to a kind of electric stabilizer that is applicable to the power control circuit of high illumination gaseous discharge lamp and has this power control circuit.
Background technology
High illumination gas discharge (high intensity discharge, HID) equiva lent impedance of lamp is because can increase along with service time, therefore stable for the lumen of keeping fluorescent tube output, fluorescent tube need receive a stable power, therefore needs a power control circuit to be used for controlling the power that offers fluorescent tube.
U.S. Patent Publication No. 2006/0261746 A1, name is called in " Power control circuit forcontrolling rated power supplied to a load ", propose a kind of power control circuit, and this power control circuit is applicable in the electric stabilizer of a high illumination gaseous discharge lamp.
Seeing also shown in Figure 1ly, is the circuit diagram of existing electric stabilizer in the past.This electric stabilizer comprises a filter rectifier 1, an active power factor correction circuit 2, a power control circuit 3 and a full-bridge converter circuit 4.
This filter rectifier 1 carries out filtering and rectification to an alternating voltage, and exports a direct current voltage.
This is power factor correction circuit 2 initiatively, is a kind of boosting (boost) DC-to-DC converter, and comprises a boost inductance L, a boost power switch S, a booster diode D and a capacitor C.This active power factor correction circuit 2 direct voltage of this filter rectifier 1 output that boosts, and produce the direct voltage that has boosted and give this capacitor C.
This power control circuit 3 can be adjusted the power that inputs to fluorescent tube.And the detailed start situation of this power control circuit 3 can be described after a while again.
This full-bridge converter circuit 4, the converting direct-current voltage into alternating-current voltage that this power control circuit 3 can be exported is to drive this fluorescent tube.
Seeing also shown in Figure 2ly, is the circuit diagram of existing power control circuit in the past.This power control circuit 3 comprises a step-down (buck) DC-to-DC converter, a detecting voltage unit 33, a current sense unit 34, a comparator 35 and a driver 36.This step-down dc-dc converter comprises an inductor-capacitor (LC) circuit 31 and a power switch unit 32.
This inductor-capacitor circuit 31 comprises an inductance L, a diode D and a capacitor C.
This power switch unit 32, it is electrically connected with this inductor-capacitor circuit 31, and for convenience of description, can represent the direct voltage of these active power factor correction circuit 2 outputs with a direct current voltage Vi, and this power switch unit 32 is switchably sent this direct voltage Vi into this inductor-capacitor circuit 31.In addition, this full-bridge converter circuit 4 and this fluorescent tube can be represented with a load R, and this inductor-capacitor circuit 31 can produce an output voltage V o to this load R.
This detecting voltage unit 33, detecting imposes on the output voltage V o on this load R, and produces one first voltage signal V1 according to the voltage that detects.
The flow through electric current of this power switch unit 32 of this current sense unit 34, detecting, and produce one second voltage signal V2 according to the electric current that detects.
This comparator 35 with sum total and the reference voltage Vref comparison of this first voltage signal V1 and this second voltage signal V2, and is exported a pulse-width modulation signal according to comparative result.
This driver 36 produces a drive signal according to the pulse-width modulation signal of this comparator 35 outputs and controls the work period of this power switch unit 32 (duty cycle), offers the power of this load R corresponding to this reference voltage Vref with control whereby.
But, in this existing in the past power control circuit 3, current sense unit 34 is to detect once in each cycle, what detecting voltage unit 33 was detected is the mean value of this output voltage V o, and can cause the reaction of current sense slack-off after these two detecting results added, and can't reach the purpose of instant adjustment power.In addition, when load R open circuit or short circuit, the signal that current sense unit 34 or detecting voltage unit 33 are detected is zero, thereby these power switch unit 32 meeting conductings, cause output voltage V o will equal input voltage Vi, the very poor voltage stress that causes being positioned at these power control circuit 3 back levels (as: full-bridge converter circuit 4) of output transient response equals prime, therefore the circuit of back level need use high voltage bearing element, for example: (transistor is an electric crystal as the transistor of switch in the full-bridge converter circuit 4, this paper all is called transistor), avoiding impaired, and the use of high pressure resistant element will cause the rising of circuit cost.
This shows that above-mentioned existing power control circuit and electric stabilizer obviously still have inconvenience and defective, and demand urgently further being improved in structure and use.In order to solve the problem of above-mentioned existence, 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, this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of power control circuit of new structure and have the electric stabilizer of this power control circuit, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Because the defective that above-mentioned existing power control circuit and electric stabilizer 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, in the hope of the power control circuit of founding a kind of new structure and electric stabilizer thereof with this power control circuit, can improve general existing power control circuit and electric stabilizer, make it have more practicality.Through constantly research, design, and, create the present invention who has practical value finally through after studying sample and improvement repeatedly.
Summary of the invention
The objective of the invention is to, overcome the defective that existing power control circuit exists, and a kind of power control circuit of new structure is provided, technical problem to be solved is to make it that a kind of power control circuit that can adjust power immediately is provided, and is very suitable for practicality.
Another object of the present invention is to, overcome the defective that existing electric stabilizer exists, and a kind of electric stabilizer of new structure is provided, technical problem to be solved is to make it can save cost, thereby is suitable for practicality more.
The object of the invention to solve the technical problems realizes by the following technical solutions.According to a kind of power control circuit that the present invention proposes, it comprises: a load circuit is applicable to connect a load, and exports an output voltage to this load; And a power switch unit, be electrically connected with this load circuit, and receive an input voltage switchably to provide this input voltage to this load circuit; This power control circuit also comprises: a detecting voltage unit, and detecting puts on the value of this output voltage in this load, and produces one first voltage signal according to the value of this output voltage; An error amplifier receives this first voltage signal and a reference voltage, and exports one second voltage signal, and this second voltage signal is relevant with error between this first voltage signal and this reference voltage; The flow through electric current of this power switch unit of a current sense unit, detecting, and produce a tertiary voltage signal according to this current value; A comparator, relatively this second voltage signal and this tertiary voltage signal, and produce a comparison signal; And a driving module, according to drive signal of comparison signal generation of this comparator, to drive the switching of this power switch unit, to control the power that offers this load whereby.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid power control circuit, wherein said detecting voltage unit comprise most the resistance that are cascaded, and this resistance that is cascaded is in parallel with this load, and one of them ohmically cross-pressure then is this first voltage signal.
Aforesaid power control circuit, wherein said detecting voltage unit comprises a differential amplifier, two input cross-over connections of this differential amplifier are in the two ends of this load, and export this first voltage signal.
Aforesaid power control circuit, wherein said error amplifier comprises an amplifying unit and most resistance, the positive input terminal of this amplifying unit receives this reference voltage, the negative input end of this amplifying unit receives this first voltage signal by one of them resistance, and the negative input end of this amplifying unit is electrically connected to the output of this amplifying unit by another resistance, and the output of this amplifying unit is exported this second voltage signal.
Aforesaid power control circuit, wherein said current sense unit comprise the resistance on the current path that is connected in this power switch unit, and this tertiary voltage signal is this ohmically cross-pressure.
Aforesaid power control circuit, wherein said driving module comprises a latch units, an oscillator, a driver element, this latch units receives an output signal of comparison signal and this oscillator of this comparator, and this latch units produces an output signal and inputs to this driver element, and this driver element produces this drive signal according to the output signal of this latch units.
Aforesaid power control circuit, it also comprises an input voltage detecting unit, and this input voltage detecting unit can be detected the variation of this input voltage, and produces the output signal frequency that one the 4th voltage signal is controlled this oscillator according to the result of detecting.
Aforesaid power control circuit, wherein said input voltage detecting unit comprise most the resistance that are cascaded, and this resistance that is cascaded is in parallel with this input voltage, and one of them ohmically cross-pressure then is the 4th voltage signal.
Aforesaid power control circuit, it also comprises an input voltage detecting unit, this input voltage detecting unit can be detected the variation of this input voltage, and the result according to detecting produces one the 5th voltage signal, and this tertiary voltage signal that this current sense unit produces is just sent into this comparator after adding the 5th voltage signal earlier.
Aforesaid power control circuit, it also comprises an input voltage detecting unit, this input voltage detecting unit can be detected the variation of this input voltage, and the result according to detecting produces one the 5th voltage signal, and this first voltage signal that this detecting voltage unit produces is just sent into this error amplifier after adding the 5th voltage signal earlier.
Purpose of the present invention and solve its technical problem and also adopt following technical scheme to realize.According to a kind of electric stabilizer that the present invention proposes, be applicable to drive a fluorescent tube that this electric stabilizer comprises: a rectification circuit, carry out an alternating voltage rectification and export a direct voltage; And a converter circuit, be electrically connected to drive this fluorescent tube with this fluorescent tube; It is characterized in that this electric stabilizer also comprises: a power control circuit, be electrically connected between this rectification circuit and this converter circuit, and receive this direct voltage, and produce an output voltage and give this converter circuit, this power control circuit comprises: a load circuit, be electrically connected with this converter circuit, and export this output voltage to this converter circuit; A power switch unit is electrically connected with this load circuit, and receives this direct voltage, switchably to provide this direct voltage to this load circuit; The value of this output voltage is detected in a detecting voltage unit, and produces one first voltage signal according to the value of this output voltage; An error amplifier receives this first voltage signal and a reference voltage, and exports one second voltage signal, and this second voltage signal is relevant with error between this first voltage signal and this reference voltage; The flow through electric current of this power switch unit of a current sense unit, detecting, and produce a tertiary voltage signal according to this current value; A comparator, relatively this second voltage signal and this tertiary voltage signal, and produce a comparison signal; And a driving module, according to drive signal of comparison signal generation of this comparator, to drive the switching of this power switch unit, to control the power that offers this converter circuit whereby.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid electric stabilizer, wherein said detecting voltage unit comprise most the resistance that are cascaded, and this resistance that is cascaded is in parallel with this load, and one of them ohmically cross-pressure then is this first voltage signal.
Aforesaid electric stabilizer, wherein said detecting voltage unit comprises a differential amplifier, two input cross-over connections of this differential amplifier are in the two ends of this load, and export this first voltage signal.
Aforesaid electric stabilizer, wherein said error amplifier comprises an amplifying unit and most resistance, the positive input terminal of this amplifying unit receives this reference voltage, the negative input end of this amplifying unit receives this first voltage signal by a resistance wherein, and the negative input end of this amplifying unit is electrically connected to the output of this amplifying unit by another resistance, and the output of this amplifying unit is exported this second voltage signal.
Aforesaid electric stabilizer, wherein said current sense unit comprise the resistance on the current path that is connected in this power switch unit, and this tertiary voltage signal is this ohmically cross-pressure.
Aforesaid electric stabilizer, wherein said driving module comprises a latch units, an oscillator, a driver element, this latch units receives an output signal of comparison signal and this oscillator of this comparator, and this latch units produces an output signal and inputs to this driver element, and this driver element produces this drive signal according to the output signal of this latch units.
Aforesaid electric stabilizer, wherein said power control circuit also comprises an input voltage detecting unit, this input voltage detecting unit can be detected the variation of this input voltage, and produces the output signal frequency that one the 4th voltage signal is controlled this oscillator according to the result of detecting.
Aforesaid electric stabilizer, wherein said input voltage detecting unit comprise most the resistance that are cascaded, and this resistance that is cascaded is in parallel with this input voltage, and one of them ohmically cross-pressure then is the 4th voltage signal.
Aforesaid electric stabilizer, wherein said power control circuit also comprises an input voltage detecting unit, this input voltage detecting unit can be detected the variation of this input voltage, and the result according to detecting produces one the 5th voltage signal, and this tertiary voltage signal that this current sense unit produces is just sent into this comparator after adding the 5th voltage signal earlier.
Aforesaid electric stabilizer, wherein said power control circuit also comprises an input voltage detecting unit, this input voltage detecting unit can be detected the variation of this input voltage, and the result according to detecting produces one the 5th voltage signal, and this first voltage signal that this detecting voltage unit produces is just sent into this error amplifier after adding the 5th voltage signal earlier.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, major technique of the present invention thes contents are as follows:
In order to achieve the above object, the invention provides a kind of power control circuit, it comprises a load circuit, a power switch unit, a detecting voltage unit, an error amplifier, a current sense unit, a comparator and a driving module.Load circuit is applicable to and connects a load and export an output voltage to this load.Power switch unit is electrically connected with this load circuit, and receives an input voltage switchably to provide this input voltage to this load circuit.The detecting of detecting voltage unit puts on the value of this output voltage in this load, and produces one first voltage signal according to the value of this output voltage.Error amplifier receives this first voltage signal and a reference voltage, and exports one second voltage signal, and this second voltage signal is relevant with error between this first voltage signal and this reference voltage.The electric current of this power switch unit of flowing through is detected in the current sense unit, and produces a tertiary voltage signal according to this current value.Comparator is this second voltage signal and this tertiary voltage signal relatively, and produces a comparison signal.The driving module produces a drive signal according to the comparison signal of this comparator, to drive the switching of this power switch unit, to control the power that offers this load whereby.
In addition, in order to achieve the above object, the present invention provides a kind of electric stabilizer in addition, comprises an above-mentioned power control circuit and a rectification circuit and a converter circuit.This rectification circuit carries out rectification with an alternating voltage, and exports a direct current voltage.This converter circuit is electrically connected with this fluorescent tube, to drive this fluorescent tube.This power control circuit is electrically connected between this rectification circuit and this converter circuit, and receives this direct voltage, and produces an output voltage to this converter circuit, and control offers the power of this converter circuit.
By technique scheme, power control circuit of the present invention and the electric stabilizer with this power control circuit thereof have following advantage and beneficial effect at least: power control circuit of the present invention and electric stabilizer are the detecting result of the detecting result of voltage circuit and current circuit separately, and can set maximum voltage output simply, reduced the voltage stress that is positioned at level (as: converter circuit) behind this power control circuit, therefore the circuit of back level need not use high voltage bearing element, and has reduced the cost of circuit.
In sum, the present invention is relevant a kind of power control circuit and the electric stabilizer with this power control circuit thereof.This power control circuit, can effectively adjust power, comprise load circuit, power switch unit, the detecting voltage unit, error amplifier, the current sense unit, comparator and driving module, load circuit connects a load and output output voltage, power switch unit receives input voltage switchably to offer load circuit, detecting voltage unit detecting output voltage also produces first voltage signal, error amplifier receives first voltage signal and a reference voltage and exports second voltage signal, the electric current of the power switch unit of flowing through is detected to produce the tertiary voltage signal in the current sense unit, comparator is second voltage signal and tertiary voltage signal relatively, drive the comparative result generation drive signal of module, control the power that offers load whereby with the switching of driving power switch element according to comparator.In addition, a kind of electric stabilizer with this power control circuit also is provided.Power control circuit of the present invention can be adjusted power immediately, and is very practical.Electric stabilizer of the present invention can be saved cost, the present invention has above-mentioned plurality of advantages and practical value, no matter it all has bigger improvement on the structure of product or function, obvious improvement is arranged technically, and produced handy and practical effect, and more existing power control circuit and electric stabilizer have the outstanding effect of enhancement, thereby are suitable for practicality more, really are 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 preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the circuit diagram of existing electric stabilizer in the past.
Fig. 2 is the circuit diagram of existing power control circuit in the past.
Fig. 3 is the circuit diagram of first preferred embodiment of power control circuit of the present invention.
Fig. 4 is the signature tune line chart of first preferred embodiment, and Fig. 4 (a) is an output voltage, and the dotted line of Fig. 4 (b) is that second voltage signal and solid line are the tertiary voltage signal, and Fig. 4 (c) is a drive signal.
Fig. 5 is the circuit diagram of second preferred embodiment of power control circuit of the present invention.
Fig. 6 is the signature tune line chart of second preferred embodiment, and Fig. 6 (a) is an input voltage, and Fig. 6 (b) is the output signal of oscillator, and the dotted line of Fig. 6 (c) is second voltage signal, and the solid line of Fig. 6 (c) is the tertiary voltage signal, and Fig. 6 (d) is a drive signal.
Fig. 7 is the circuit diagram of the 3rd preferred embodiment of power control circuit of the present invention.
Fig. 8 is the signature tune line chart of the 3rd preferred embodiment, and Fig. 8 (a) is an input voltage, and the dotted line of Fig. 8 (b) is second voltage signal, and solid line is the summation of tertiary voltage signal and the 5th voltage signal, and Fig. 8 (c) is a drive signal.
Fig. 9 is the circuit diagram of the 4th preferred embodiment of power control circuit of the present invention.
Figure 10 is the signature tune line chart of the 4th preferred embodiment, and Figure 10 (a) is an input voltage, the signal of the dotted line of Figure 10 (b) for exporting for error amplifier, and solid line is the tertiary voltage signal, and Figure 10 (c) is a drive signal.
Figure 11 is the circuit diagram of the 5th preferred embodiment of power control circuit of the present invention.
Figure 12 is the circuit diagram of the 6th preferred embodiment of power control circuit of the present invention.
Figure 13 is the circuit diagram of the 7th preferred embodiment of power control circuit of the present invention.
Figure 14 is the circuit diagram of the 8th preferred embodiment of power control circuit of the present invention.
Figure 15 is the circuit diagram of the 9th preferred embodiment of power control circuit of the present invention.
Figure 16 is the circuit diagram of the tenth preferred embodiment of power control circuit of the present invention.
Figure 17 is the circuit diagram of the 11 preferred embodiment of power control circuit of the present invention.
Figure 18 is the circuit diagram of the 12 preferred embodiment of power control circuit of the present invention.
Figure 19 is the calcspar of an embodiment of electric stabilizer of the present invention.
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, the power control circuit that foundation the present invention is proposed and have its embodiment of electric stabilizer, structure, feature and the effect thereof of this power control circuit, describe in detail as after.
Relevant aforementioned and other technology contents, characteristics and effect of the present invention can clearly present in the following detailed description that cooperates with reference to graphic preferred embodiment.Before the present invention is described in detail, be noted that in the following description content similar elements is to represent with identical numbering.
Seeing also shown in Figure 3ly, is the circuit diagram of first preferred embodiment of power control circuit of the present invention.The power control circuit of first preferred embodiment of the present invention, step-down (buck) the DC-to-DC electric pressure converter, a detecting voltage unit 53, a current sense unit 54, an error amplifier 55, the comparator 56 and that comprise a high side (high-side) drive module 57.And this decompression DC-DC electric pressure converter comprises a load circuit 51 and a power switch unit 52.
This load circuit 51 comprises an inductance L, a diode D and a capacitor C.The cathodic electricity of first end of this inductance L, first end of this power switch unit 52 and this diode D connects, and the anode of this diode D is electrically connected with first end of this capacitor C, and second end of this capacitor C is electrically connected with second end of this inductance L.
In the time of these power switch unit 52 conductings, an electric current can be from input voltage Vi through power switch unit 52 flow through inductance L, capacitor C.And in the time of these power switch unit 52 not conductings, because the electric current that flows through on the inductance L is necessary for successive value, so diode D is compelled to conducting, and then the electrical power that stores on the inductance L is transferred on the capacitor C.
These detecting voltage unit 53 detectings put on the output voltage V o on the load R, and produce one first voltage signal V1 according to this output voltage V o.
In the present embodiment, this detecting voltage unit 53, comprise one first resistance R 1 and one second resistance R 2, this first resistance R 1 and second resistance R, 2 series connection backs are in parallel with this load R, and this second ohmically cross-pressure is this first voltage signal V1, and the value of this first voltage signal V1 is V1=Vo*R2/ (R1+R2).
This error amplifier 55 comprises an amplifying unit A2, one the 3rd resistance R 3 and one the 4th resistance R 4.The positive input terminal of this amplifying unit A2 receives a reference voltage Vref.The negative input end of this amplifying unit A2 receives this first voltage signal V1 by the 3rd resistance R 3, and the negative input end of this amplifying unit A2 also is electrically connected to the output of amplifying unit A2 by the 4th resistance R 4.And the output of the amplifying unit A2 of this error amplifier 55 is exported one second voltage signal V2=(Vref-V1)+Vref.
The flow through electric current of this power switch unit 52 of this current sense unit 54, detecting, and produce a tertiary voltage signal V3 according to the electric current that detects.In one embodiment, this current sense unit 54 comprises that one is connected in the 5th resistance R 5 on the current path of this power switch unit 52, and this tertiary voltage signal V3 is the cross-pressure on the 5th resistance R 5.
This comparator 56, relatively this second voltage signal V2 and this tertiary voltage signal V3, and produce a comparison signal to this driving module 57.
This drives module 57, controls the work period (duty cycle) that this power switch unit 52 switches according to the comparison signal of this comparator 56, to control the power that offers this load R whereby.This driving module 57 comprises a latch units (latch) 571, an oscillator 572, a driver element 573.
What the output signal of this comparator 56 was imported this latch units 571 resets end (Reset), and the output signal of this oscillator 572 is imported the setting end (Set) of this latch units 571, and the output signal of this latch units 571 is imported this driver element 573.
This driver element 573 produces the control input unit 521 that a drive signal is given power switch unit 52 according to the output signal of latch units 571, to change the work period that power switch unit 52 switches.In one embodiment, this power switch unit 52 comprises just like transistorized switch, and this control input unit 521 is to comprise this transistorized control end, as: transistorized gate.
Seeing also shown in Figure 4ly, is the signature tune line chart of first preferred embodiment, and Fig. 4 (a) is an output voltage, and the dotted line of Fig. 4 (b) is that second voltage signal and solid line are the tertiary voltage signal, and Fig. 4 (c) is a drive signal.Fig. 4 (a) has illustrated this output voltage V o, Fig. 4 (b) has illustrated two input signals that input to this comparator 56, that is: by second voltage signal V2 (dotted line) of error amplifier 55 outputs and the tertiary voltage signal V3 (solid line) that is exported by this current sense unit 54; And Fig. 4 (c) has illustrated the drive signal of these driver element 573 outputs.
It should be noted that, first embodiment is because added error amplifier 55, and the detecting result of the detecting result of voltage circuit and current circuit separately, and because after adding error amplifier 55, the maximum of output voltage V o can be adjusted, and reduced the voltage stress that is positioned at level (as: full-bridge converter circuit) behind this power control circuit, therefore the circuit of back level need not use high voltage bearing element, and has reduced the cost of circuit.In addition, the detecting result of current sense unit 54 directly imports this comparator 56, and needs unlike in the past and the detecting results added of detecting voltage unit 53, thereby does not have time delay and respond bad problem.
Seeing also shown in Figure 5ly, is the circuit diagram of second preferred embodiment of power control circuit of the present invention.Second preferred embodiment of power control circuit of the present invention is than the difference of first preferred embodiment, also comprise an input voltage detecting unit 58, this input voltage detecting unit 58 can be detected the variation of input voltage Vi, and produces the frequency of oscillation that one the 4th voltage signal V4 controls this oscillator 572 according to the result of detecting.I.e. when input voltage Vi raises when raising (just the 4th voltage signal V4) reduces the frequency of oscillation of this oscillator 572.
Seeing also shown in Figure 6ly, is the signature tune line chart of the present invention's second preferred embodiment, and Fig. 6 (a) is an input voltage, Fig. 6 (b) is the output signal of oscillator, the dotted line of Fig. 6 (c) is second voltage signal, and the solid line of Fig. 6 (c) is the tertiary voltage signal, and Fig. 6 (d) is a drive signal.As Fig. 6 (a) for this input voltage Vi during by low uprising, Fig. 6 (b) is the output signal of this oscillator 572, the dotted line of Fig. 6 (c) is the second voltage signal V2 of error amplifier 55 outputs, and the solid line of Fig. 6 (c) is the tertiary voltage signal V3 of current sense unit 54 outputs, and Fig. 6 (d) has illustrated the drive signal of these driver element 573 outputs.
Please return consult shown in Figure 5, this input voltage detecting unit 58, comprise one the 6th resistance R 6 and one the 7th resistance R 7, and it is in parallel after the 6th resistance R 6 and the 7th resistance R 7 are cascaded with this input voltage Vi, and input voltage detecting unit 58 is multiplied by a ratio kb with the cross-pressure on the 7th resistance R 7, to obtain the 4th voltage signal V4.
Seeing also shown in Figure 7ly, is the circuit diagram of power control circuit the 3rd preferred embodiment of the present invention.The 3rd preferred embodiment of power control circuit of the present invention is than the difference of first preferred embodiment, also comprise an input voltage detecting unit 59, this input voltage detecting unit 59 can be detected the variation of input voltage Vi, and produces one the 5th voltage signal V5 according to the result of detecting.
One termination of this comparator 56 is received the summation of the tertiary voltage signal V3 of the 5th voltage signal V5 and 54 outputs of this current sense unit, and the other end receives this second voltage signal V2.
Seeing also shown in Figure 8ly, is the signature tune line chart of the present invention's the 3rd preferred embodiment, and Fig. 8 (a) is an input voltage, and the dotted line of Fig. 8 (b) is second voltage signal, and solid line is the summation of tertiary voltage signal and the 5th voltage signal, and Fig. 8 (c) is a drive signal.As Fig. 8 (a) for this input voltage Vi during by low uprising, the dotted line of Fig. 8 (b) is the second voltage signal V2 of error amplifier 55 outputs, and the solid line of Fig. 8 (b) is the summation of the 5th voltage signal V5 and tertiary voltage signal V3, and Fig. 8 (c) has illustrated the drive signal of these driver element 573 outputs.
Please return consult shown in Figure 7, this input voltage detecting unit 59 comprises one the 8th resistance R 8 and one the 9th resistance R 9, and it is in parallel after the 8th resistance R 8 and the 9th resistance R 9 are cascaded with this input voltage Vi, and input voltage detecting unit 59 is multiplied by a ratio kb with the cross-pressure on the 9th resistance R 9, to obtain the 5th voltage signal V5.
Seeing also shown in Figure 9ly, is the circuit diagram of power control circuit the 4th preferred embodiment of the present invention.The 4th preferred embodiment and the 3rd preferred embodiment of power control circuit of the present invention are similar, and different places is that the 5th voltage signal V5 is and the first voltage signal V1 adds up, and the signal that adds the General Logistics Department is sent into this error amplifier 55.
The signal of power control circuit the 4th preferred embodiment of the present invention sees also shown in Figure 10, it is the signature tune line chart of the present invention's the 4th preferred embodiment, Figure 10 (a) is an input voltage, the dotted line of Figure 10 (b) is the signal for error amplifier output, and solid line is the tertiary voltage signal, and Figure 10 (c) is a drive signal.During by low uprising, the dotted line of Figure 10 (b) is the signal V2 ' of error amplifier 55 outputs to Figure 10 (a) for this input voltage Vi, and the solid line of Figure 10 (b) is tertiary voltage signal V3, and Figure 10 (c) has illustrated the drive signal of these driver element 573 outputs.
Seeing also shown in Figure 11ly, is the circuit diagram of the 5th preferred embodiment of power control circuit of the present invention.The 5th preferred embodiment of the power control circuit of the present invention place different with first preferred embodiment is that the electric pressure converter of the 5th embodiment is a kind of boosting (boost) DC-to-DC electric pressure converter.
Seeing also shown in Figure 12ly, is the circuit diagram of the 6th preferred embodiment of power control circuit of the present invention.The 6th preferred embodiment and first preferred embodiment of power control circuit of the present invention are similar, and different places are that the electric pressure converter of the 6th embodiment is a kind of forward (forward) DC-to-DC electric pressure converter.And its load circuit that comprises 51 comprises a transformer T, two diode D, an inductance and capacitor C.
Seeing also shown in Figure 13ly, is the circuit diagram of the 7th preferred embodiment of power control circuit of the present invention.The 7th preferred embodiment and first preferred embodiment of power control circuit of the present invention are similar, and different places are that the electric pressure converter of the 7th embodiment is a kind of flyback (flyback) DC-to-DC electric pressure converter.And its load circuit that comprises 51 comprises a transformer T, a diode D and a capacitor C.
Seeing also shown in Figure 14ly, is the circuit diagram of the 8th preferred embodiment of power control circuit of the present invention.The 8th preferred embodiment and first preferred embodiment of power control circuit of the present invention are similar, and different places are that the electric pressure converter among the 8th embodiment is a kind of push-pull type (push-pull) DC-to-DC electric pressure converter.And its load circuit that comprises 51 comprises a transformer T, two diode D, an inductance L and capacitor C, and this power switch unit 52 comprises two by the switch of these driver element 573 controls.
Seeing also shown in Figure 15ly, is the circuit diagram of the 9th preferred embodiment of power control circuit of the present invention.The 9th preferred embodiment and first preferred embodiment of power control circuit of the present invention are similar, and different places are that the electric pressure converter among the 9th embodiment is a kind of half-bridge (half-bridge) DC-to-DC electric pressure converter.And its load circuit that comprises 51 comprises a transformer T, two diode D, an inductance L and two capacitor C.
Seeing also shown in Figure 16ly, is the circuit diagram of the tenth preferred embodiment of power control circuit of the present invention.The tenth preferred embodiment and first preferred embodiment of power control circuit of the present invention are similar, and different places are that the electric pressure converter among the tenth embodiment is a kind of full-bridge (full-bridge) DC-to-DC electric pressure converter.And its load circuit that comprises 51 comprises a transformer T, two diode D, an inductance L and two capacitor C, and this power switch unit 52 comprises four by the switch of these driver element 573 controls.
Seeing also shown in Figure 17ly, is the circuit diagram of the 11 preferred embodiment of power control circuit of the present invention.The 11 preferred embodiment and first preferred embodiment of power control circuit of the present invention are similar, and different places are that the electric pressure converter among the 11 embodiment is a kind of buck-boost (buck-boost) DC-to-DC electric pressure converter.
Seeing also shown in Figure 180ly, is the circuit diagram of the 12 preferred embodiment of power control circuit of the present invention.The 12 preferred embodiment and first preferred embodiment of power control circuit of the present invention are similar, and different places are that the electric pressure converter among the 12 embodiment is a kind of downside (low-side) decompression DC-DC electric pressure converter.In this embodiment, this detecting voltage unit 53 ' is a differential amplifier, this differential amplifier comprises an amplifying unit A1, two first resistance R 1 ' and two second resistance R 2 ', the positive input terminal of this amplifying unit A1 and negative input end pass through the 1 ' cross-over connection of first resistance R respectively in the two ends of this load R, and the positive input terminal of this amplifying unit A1 also is electrically connected to ground by one second resistance R 2 ', and the negative input end of this amplifying unit A1 also is electrically connected to the output of this amplifying unit A1 by another second resistance R 2 '.And the output of this amplifying unit A1 is promptly exported this first voltage signal V1, and the value of this first voltage signal V1 is V1=(R2/R1) * Vo.
It should be noted that, other of this detecting voltage unit 53,53 ', input voltage detecting unit 58,59 are implemented aspects and are comprised with optical coupler, electric pressure converter exclusive disjunction amplifier and realizing, and other of this current sense unit 54 are implemented aspects and comprised with current converter exclusive disjunction amplifier and realizing.
See also Figure 19 and shown in Figure 3, Figure 19 is the calcspar of an embodiment of electric stabilizer of the present invention.And an embodiment of electric stabilizer of the present invention is applicable to driving one fluorescent tube 91, and comprises the power control circuit 92 of a rectification circuit 93, a converter circuit 94 and above-mentioned arbitrary embodiment.
This rectification circuit 93 carries out rectification with the alternating voltage of civil power, and the input voltage Vi of output direct current.
This converter circuit 94 is electrically connected with this fluorescent tube 91, to drive this fluorescent tube 91.
This power control circuit 92 is electrically connected on 94 of this rectification circuit 93 and this converter circuits.And the power switch unit 52 of this power control circuit 92 receives this input voltage Vi, and switchably this input voltage Vi is offered load circuit 51, and this load circuit 51 produces output voltage V o to load R.Load R then is converter circuit 94 and fluorescent tube 91.
In sum, because added error amplifier 55, maximum output voltage can be adjusted among the present invention, and has reduced the voltage stress that is positioned at level behind this power control circuit, has therefore reduced the cost of circuit.In addition, the detecting result of current sense unit 54 directly imports this comparator 56, thereby can not have the problem of time delay.
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 technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solution of the present invention content, 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 (20)
1. power control circuit, it comprises:
A load circuit is applicable to connect a load, and exports an output voltage to this load; And
A power switch unit is electrically connected with this load circuit, and receives an input voltage switchably to provide this input voltage to this load circuit;
It is characterized in that this power control circuit also comprises:
A detecting voltage unit, detecting puts on the value of this output voltage in this load, and produces one first voltage signal according to the value of this output voltage;
An error amplifier receives this first voltage signal and a reference voltage, and exports one second voltage signal, and this second voltage signal is relevant with error between this first voltage signal and this reference voltage;
The flow through electric current of this power switch unit of a current sense unit, detecting, and produce a tertiary voltage signal according to this current value;
A comparator, relatively this second voltage signal and this tertiary voltage signal, and produce a comparison signal; And
One drives module, according to drive signal of comparison signal generation of this comparator, to drive the switching of this power switch unit, to control the power that offers this load whereby.
2. power control circuit as claimed in claim 1, it is characterized in that wherein said detecting voltage unit comprises most the resistance that are cascaded, and this resistance that is cascaded is in parallel with this load, and one of them ohmically cross-pressure then is this first voltage signal.
3. power control circuit as claimed in claim 1 is characterized in that wherein said detecting voltage unit comprises a differential amplifier, and two input cross-over connections of this differential amplifier are in the two ends of this load, and exports this first voltage signal.
4. power control circuit as claimed in claim 1, it is characterized in that wherein said error amplifier comprises an amplifying unit and most resistance, the positive input terminal of this amplifying unit receives this reference voltage, the negative input end of this amplifying unit receives this first voltage signal by one of them resistance, and the negative input end of this amplifying unit is electrically connected to the output of this amplifying unit by another resistance, and the output of this amplifying unit is exported this second voltage signal.
5. power control circuit as claimed in claim 1 it is characterized in that wherein said current sense unit comprises the resistance on the current path that is connected in this power switch unit, and this tertiary voltage signal is this ohmically cross-pressure.
6. power control circuit as claimed in claim 1, it is characterized in that wherein said driving module comprises a latch units, an oscillator, a driver element, this latch units receives an output signal of comparison signal and this oscillator of this comparator, and this latch units produces an output signal and inputs to this driver element, and this driver element produces this drive signal according to the output signal of this latch units.
7. power control circuit as claimed in claim 6, it is characterized in that it also comprises an input voltage detecting unit, this input voltage detecting unit can be detected the variation of this input voltage, and produces the output signal frequency that one the 4th voltage signal is controlled this oscillator according to the result of detecting.
8. power control circuit as claimed in claim 7, it is characterized in that wherein said input voltage detecting unit comprises most the resistance that are cascaded, and this resistance that is cascaded is in parallel with this input voltage, and one of them ohmically cross-pressure then is the 4th voltage signal.
9. power control circuit as claimed in claim 1, it is characterized in that it also comprises an input voltage detecting unit, this input voltage detecting unit can be detected the variation of this input voltage, and the result according to detecting produces one the 5th voltage signal, and this tertiary voltage signal that this current sense unit produces is just sent into this comparator after adding the 5th voltage signal earlier.
10. power control circuit as claimed in claim 1, it is characterized in that it also comprises an input voltage detecting unit, this input voltage detecting unit can be detected the variation of this input voltage, and the result according to detecting produces one the 5th voltage signal, and this first voltage signal that this detecting voltage unit produces is just sent into this error amplifier after adding the 5th voltage signal earlier.
11. an electric stabilizer is applicable to drive a fluorescent tube, this electric stabilizer comprises:
A rectification circuit carries out an alternating voltage rectification and exports a direct voltage; And
A converter circuit is electrically connected to drive this fluorescent tube with this fluorescent tube;
It is characterized in that this electric stabilizer also comprises:
A power control circuit is electrically connected between this rectification circuit and this converter circuit, and receives this direct voltage, and produces an output voltage to this converter circuit, and this power control circuit comprises:
A load circuit is electrically connected with this converter circuit, and exports this output voltage to this converter circuit;
A power switch unit is electrically connected with this load circuit, and receives this direct voltage, switchably to provide this direct voltage to this load circuit;
The value of this output voltage is detected in a detecting voltage unit, and produces one first voltage signal according to the value of this output voltage;
An error amplifier receives this first voltage signal and a reference voltage, and exports one second voltage signal, and this second voltage signal is relevant with error between this first voltage signal and this reference voltage;
The flow through electric current of this power switch unit of a current sense unit, detecting, and produce a tertiary voltage signal according to this current value;
A comparator, relatively this second voltage signal and this tertiary voltage signal, and produce a comparison signal; And
One drives module, according to drive signal of comparison signal generation of this comparator, to drive the switching of this power switch unit, to control the power that offers this converter circuit whereby.
12. electric stabilizer as claimed in claim 11, it is characterized in that wherein said detecting voltage unit comprises most the resistance that are cascaded, and this resistance that is cascaded is in parallel with this load, and one of them ohmically cross-pressure then is this first voltage signal.
13. electric stabilizer as claimed in claim 11 is characterized in that wherein said detecting voltage unit comprises a differential amplifier, two input cross-over connections of this differential amplifier are in the two ends of this load, and export this first voltage signal.
14. electric stabilizer as claimed in claim 11, it is characterized in that wherein said error amplifier comprises an amplifying unit and most resistance, the positive input terminal of this amplifying unit receives this reference voltage, the negative input end of this amplifying unit receives this first voltage signal by a resistance wherein, and the negative input end of this amplifying unit is electrically connected to the output of this amplifying unit by another resistance, and the output of this amplifying unit is exported this second voltage signal.
15. electric stabilizer as claimed in claim 11 it is characterized in that wherein said current sense unit comprises the resistance on the current path that is connected in this power switch unit, and this tertiary voltage signal is this ohmically cross-pressure.
16. electric stabilizer as claimed in claim 11, it is characterized in that wherein said driving module comprises a latch units, an oscillator, a driver element, this latch units receives an output signal of comparison signal and this oscillator of this comparator, and this latch units produces an output signal and inputs to this driver element, and this driver element produces this drive signal according to the output signal of this latch units.
17. electric stabilizer as claimed in claim 16, it is characterized in that wherein said power control circuit also comprises an input voltage detecting unit, this input voltage detecting unit can be detected the variation of this input voltage, and produces the output signal frequency that one the 4th voltage signal is controlled this oscillator according to the result of detecting.
18. electric stabilizer as claimed in claim 17, it is characterized in that wherein said input voltage detecting unit comprises most the resistance that are cascaded, and this resistance that is cascaded is in parallel with this input voltage, and one of them ohmically cross-pressure then is the 4th voltage signal.
19. electric stabilizer as claimed in claim 11, it is characterized in that wherein said power control circuit also comprises an input voltage detecting unit, this input voltage detecting unit can be detected the variation of this input voltage, and the result according to detecting produces one the 5th voltage signal, and this tertiary voltage signal that this current sense unit produces is just sent into this comparator after adding the 5th voltage signal earlier.
20. electric stabilizer as claimed in claim 11, it is characterized in that wherein said power control circuit also comprises an input voltage detecting unit, this input voltage detecting unit can be detected the variation of this input voltage, and the result according to detecting produces one the 5th voltage signal, and this first voltage signal that this detecting voltage unit produces is just sent into this error amplifier after adding the 5th voltage signal earlier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710140452XA CN101369777A (en) | 2007-08-14 | 2007-08-14 | Power control circuit and electronic ballast with the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710140452XA CN101369777A (en) | 2007-08-14 | 2007-08-14 | Power control circuit and electronic ballast with the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101369777A true CN101369777A (en) | 2009-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200710140452XA Pending CN101369777A (en) | 2007-08-14 | 2007-08-14 | Power control circuit and electronic ballast with the same |
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| Country | Link |
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| CN (1) | CN101369777A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101827486A (en) * | 2010-03-31 | 2010-09-08 | 苏州达方电子有限公司 | Light tube module |
| CN102624209A (en) * | 2012-03-23 | 2012-08-01 | 电子科技大学 | Voltage-reduction-type converter control device |
| CN102711330A (en) * | 2012-05-31 | 2012-10-03 | 耀发电子股份有限公司 | Rapid reaction energy balancing calculation technology-based light-emitting diode (LED) driving method and system |
| CN102946676A (en) * | 2012-11-23 | 2013-02-27 | 宁波市爱使电器有限公司 | Constant voltage and constant current power supply of light-emitting diode (LED) lamp |
| CN111786548A (en) * | 2019-11-28 | 2020-10-16 | 西门子电动汽车动力总成系统(上海)有限公司 | Discharge control circuit suitable for high-voltage electronic equipment |
| CN112448679A (en) * | 2019-08-30 | 2021-03-05 | 立积电子股份有限公司 | Logarithmic power detector |
-
2007
- 2007-08-14 CN CNA200710140452XA patent/CN101369777A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101827486A (en) * | 2010-03-31 | 2010-09-08 | 苏州达方电子有限公司 | Light tube module |
| CN101827486B (en) * | 2010-03-31 | 2013-05-15 | 苏州达方电子有限公司 | Light tube module |
| CN102624209A (en) * | 2012-03-23 | 2012-08-01 | 电子科技大学 | Voltage-reduction-type converter control device |
| CN102711330A (en) * | 2012-05-31 | 2012-10-03 | 耀发电子股份有限公司 | Rapid reaction energy balancing calculation technology-based light-emitting diode (LED) driving method and system |
| CN102711330B (en) * | 2012-05-31 | 2014-06-18 | 耀发电子股份有限公司 | Rapid reaction energy balancing calculation technology-based light-emitting diode (LED) driving method and system |
| CN102946676A (en) * | 2012-11-23 | 2013-02-27 | 宁波市爱使电器有限公司 | Constant voltage and constant current power supply of light-emitting diode (LED) lamp |
| CN102946676B (en) * | 2012-11-23 | 2015-01-07 | 宁波市爱使电器有限公司 | Constant voltage and constant current power supply of light-emitting diode (LED) lamp |
| CN112448679A (en) * | 2019-08-30 | 2021-03-05 | 立积电子股份有限公司 | Logarithmic power detector |
| CN111786548A (en) * | 2019-11-28 | 2020-10-16 | 西门子电动汽车动力总成系统(上海)有限公司 | Discharge control circuit suitable for high-voltage electronic equipment |
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