CN104242633A - Step-down circuit and driving device - Google Patents
Step-down circuit and driving device Download PDFInfo
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- CN104242633A CN104242633A CN201410453371.5A CN201410453371A CN104242633A CN 104242633 A CN104242633 A CN 104242633A CN 201410453371 A CN201410453371 A CN 201410453371A CN 104242633 A CN104242633 A CN 104242633A
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Abstract
The invention provides a step-down circuit. The step-down circuit comprises an oscillation switch module and an adjusting module, wherein the oscillation switch module is used for selectively connecting the input end of the step-down circuit and the output end of the step-down circuit, so that output voltage of the output end of the step-down circuit is smaller than input voltage of the input end of the step-down circuit, and the adjusting module is connected with the oscillation switch module and is used for adjusting the connecting duration of the oscillation switch module, so that the output voltage of the output end of the step-down circuit is adjusted to reach a preset value. Correspondingly, the invention further provides a driving device. Compared with the prior art, the step-down circuit and the driving device can improve the stability of the output voltage.
Description
Technical field
The present invention relates to the driving field of display device, particularly, relate to a kind of reduction voltage circuit and the drive unit comprising this reduction voltage circuit.
Background technology
The life that liquid crystal display is light with it, ultra-thin, the feature such as multicolour and high definition more and more comes into people, and become the leading role in whole display field.In order to show different pictures, LCDs needs to be driven by different voltage signals.Wherein reduction voltage circuit is indispensable, and existing in the reduction voltage circuit course of work in, because input voltage easily produces fluctuation, cause output voltage unstable, thus affect the driving effect of signal, and then the display quality of reduction picture.
Summary of the invention
The object of the present invention is to provide a kind of reduction voltage circuit and the drive unit comprising this reduction voltage circuit, to improve the stability of output voltage.
To achieve these goals, the invention provides a kind of reduction voltage circuit, this reduction voltage circuit comprises: concussion switch module, this concussion switch module is used for the output optionally conducting by the input of described reduction voltage circuit and described reduction voltage circuit, the input voltage of the input of described reduction voltage circuit is less than with the output voltage of the output making described reduction voltage circuit, described reduction voltage circuit also comprises adjustment module, this adjustment module is connected with described concussion switch module, for regulating the conduction duration of concussion switch module, preset value is adjusted to the output voltage of the output by described reduction voltage circuit.
Preferably, described adjustment module comprises feedback end and decision element, described feedback end is for obtaining sampled voltage and being delivered to described decision element, described sampled voltage is based on the output voltage of the output of described reduction voltage circuit, when described decision element to judge that according to described sampled voltage the output voltage of the output of described reduction voltage circuit is different from described preset value, described adjustment module can generate conditioning signal.
Preferably, described adjustment module comprises sample resistance, and described sample resistance is in parallel with the output of described reduction voltage circuit, and described feedback end is electrically connected with the middle part of described sample resistance.
Preferably, described sample resistance comprises the 5th resistance and the 6th resistance of series connection, and described decision element comprises the 4th triode, the 3rd resistance, the 4th resistance and voltage-stabiliser tube,
The collector electrode of described 4th triode is connected with described concussion switch module by the 3rd resistance, the emitter of the 4th triode is connected with the positive pole of the output of described reduction voltage circuit by the 4th resistance, and the base stage of described 4th triode is connected between described 5th resistance and described 6th resistance;
The positive pole of described voltage-stabiliser tube is connected with the negative pole of the output of described reduction voltage circuit, and the negative pole of described voltage-stabiliser tube is connected with the emitter of described 4th triode.
Preferably, described sample resistance also comprises potentiometer, and the first end of this potentiometer is connected with described 5th resistance, and the second end of described potentiometer is connected with described 6th resistance, and the adjustable side of described potentiometer is connected with the base stage of described 4th triode.
Preferably, described concussion switch module comprises switch element and control unit, between the input that described switch element is connected to described reduction voltage circuit and output, described control unit is connected with described adjustment module, described control unit can receive the conditioning signal that described adjustment module sends, and can generate the switching signal of the conduction duration controlling described switch element according to described conditioning signal.
Preferably, described switch element comprises the first triode, the second triode, the 3rd triode and the first resistance,
The base stage of described first triode is connected with the base stage of the emitter of described second triode and the 3rd triode, the emitter of the first triode is connected with the positive pole of the input of described reduction voltage circuit, and the positive pole of the output of the collector electrode of the first triode and the first end of described control unit and described reduction voltage circuit is connected;
The base stage of described second triode is connected with the collector electrode of described 3rd triode, and the positive pole of the output of the collector electrode of described second triode and the first end of described control unit and described reduction voltage circuit is connected;
The emitter of described 3rd triode is connected with the positive pole of the input of described reduction voltage circuit, the base stage of the 3rd triode is connected with the second end of described control unit and described adjustment module, and the collector electrode of the 3rd triode is connected with the negative pole of the input of described reduction voltage circuit by the first resistance.
Preferably, described control unit comprises the second resistance and the second electric capacity,
The first end of described second resistance is connected with the collector electrode of described second triode, second end of described second resistance is connected with the first end of described second electric capacity, and the second end of described second electric capacity is connected with the base stage of described 3rd triode and described adjustment module.
Preferably, described concussion switch module comprises energy-storage module, the downstream of described concussion switch module is positioned between the both positive and negative polarity that this energy-storage module is connected to the output of described reduction voltage circuit, described energy-storage module can store in described concussion switch module conduction period the voltage inputted from the input of described reduction voltage circuit, and to the output output voltage of described reduction voltage circuit between the described concussion switch module off period, to stablize the output output voltage of described reduction voltage circuit.
Preferably, described energy-storage module comprises inductance, the 3rd electric capacity and fly-wheel diode,
The first end of described inductance is connected with the first end of described second resistance, and the second end of described inductance is connected with the output of described reduction voltage circuit;
Described 3rd Capacitance parallel connection is between the both positive and negative polarity of the output of described reduction voltage circuit;
The negative electrode of described fly-wheel diode is connected with the first end of described inductance, and anode is connected with the positive pole of the input of described reduction voltage circuit.
Preferably, described reduction voltage circuit also comprises the first electric capacity between the both positive and negative polarity of the input being connected to described reduction voltage circuit.
Correspondingly, the present invention also provides a kind of drive unit, and this drive unit comprises above-mentioned reduction voltage circuit.
In the present invention, adjustment module can regulate the conduction duration of concussion switch module, namely the duty ratio of the control signal of concussion switch module is regulated, thus the output voltage of the output being different from the described reduction voltage circuit of preset value can be adjusted to described preset value, the stability of output voltage thus can be kept by the adjustment of adjustment module.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Shown in Fig. 1 is the composition schematic diagram of reduction voltage circuit provided by the present invention;
Shown in Fig. 2 is the concrete structure schematic diagram of reduction voltage circuit provided by the present invention.
Wherein, Reference numeral is:
10, switch module is shaken; 11, switch element; 12, control unit; 20, adjustment module; 21, decision element; 30, energy-storage module; C1, the first electric capacity; C2, the second electric capacity; C3, the 3rd electric capacity; VT1, the first triode; VT2, the second triode; VT3, the 3rd triode; VT4, the 4th triode; VD, fly-wheel diode; DZ, voltage-stabiliser tube; R1, the first resistance; R2, the second resistance; R3, the 3rd resistance; R4, the 4th resistance; R5, the 5th resistance; R6, the 6th resistance; RP, potentiometer; L, inductance.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
As an aspect of of the present present invention, a kind of reduction voltage circuit is provided, as shown in Figure 1, this reduction voltage circuit comprises concussion switch module 10 and adjustment module 20: concussion switch module 10, for the output optionally conducting by the input of described reduction voltage circuit and described reduction voltage circuit, is less than the input voltage of the input of described reduction voltage circuit with the output voltage of the output making described reduction voltage circuit; Adjustment module 20 is connected with concussion switch module 10, for regulating the conduction duration of concussion switch module 10, is adjusted to preset value with the output voltage of the output by described reduction voltage circuit.
The duty ratio D of the output voltage Uo of the output of described reduction voltage circuit and the input voltage Ui of described reduction voltage circuit and the control signal of shaking switch module 10 is relevant, Uo=Ui*D, by regulating duty ratio D, and can regulation output voltage.
In the present invention, adjustment module 20 can regulate the conduction duration of concussion switch module 10, namely the duty ratio of the control signal of concussion switch module 10 is regulated, thus the output voltage of the output being different from the described reduction voltage circuit of preset value can be adjusted to described preset value, the stability of output voltage thus can be kept by the adjustment of adjustment module 20.Such as, work as Ui=10V, when duty ratio D is 50%, output voltage Uo=5V, when output voltage is affected and changes, during as output voltage Uo=6V, shortened the ON time of concussion switch module 10 by adjustment module 20, namely duty ratio D is reduced, until output voltage is reduced to required 5V by 6V.
The present invention is not specifically limited the structure of adjustment module 20 and regulative mode, as long as the conduction duration of concussion switch module can be regulated, as a kind of embodiment of the present invention, adjustment module 20 can detect the output voltage of reduction voltage circuit output, and regulates according to the ON time of this output voltage to concussion switch module.
As shown in Figure 2, adjustment module 20 can comprise feedback end and decision element 21, described feedback end is for obtaining sampled voltage and being delivered to decision element 21, described sampled voltage is based on the output voltage of the output of described reduction voltage circuit, when decision element 21 to judge that according to described sampled voltage the output voltage of the output of described reduction voltage circuit is different from described preset value, described adjustment module can generate conditioning signal.
Described sampled voltage is directly proportional to the output voltage of the output of described reduction voltage circuit, and when described output voltage equals the preset value under normal condition, described sampled voltage is for presetting sampled voltage; When described output voltage is higher than preset value under normal condition, described sampled voltage is higher than described default sampled voltage, decision element 21 can judge that the output voltage of the output of described reduction voltage circuit is higher than described preset value, thus make adjustment module 20 generate corresponding conditioning signal (as, first conditioning signal), to shorten the conduction duration of concussion switch module 10, until described output voltage is reduced to described preset value; When described output voltage is lower than described preset value, described sampled voltage is lower than described default sampled voltage, decision element 21 can judge that described output voltage is lower than described preset value, thus make adjustment module 20 generate corresponding conditioning signal (as, second conditioning signal), to extend the conduction duration of concussion switch module 10, until described output voltage increases to described preset value.
Further, in order to obtain sampling voltage, adjustment module 20 can comprise sample resistance, and this sample resistance is in parallel with the output of described reduction voltage circuit, and described feedback end is electrically connected with the middle part of described sample resistance.The voltage at described sample resistance two ends is the output voltage of the output of described reduction voltage circuit, and the voltage between the negative pole of described feedback end and described output is described sampled voltage.
Particularly, as shown in Figure 2, described sample resistance comprises the 5th resistance R5 and the 6th resistance R6 of series connection, decision element 21 can comprise the 4th triode VT4, the 3rd resistance R3, the 4th resistance R4 and voltage-stabiliser tube DZ, the collector electrode of the 4th triode VT4 is connected with concussion switch module 10 by the 3rd resistance R3, the emitter of the 4th triode VT4 is connected with the positive pole of the output of described reduction voltage circuit by the 4th resistance R4, and the 4th triode VT4 is actively connected between the 5th resistance R5 and the 6th resistance R6; The positive pole of voltage-stabiliser tube VZ is connected with the negative pole of the output of described reduction voltage circuit, and the negative pole of voltage-stabiliser tube VZ is connected with the emitter of the 4th triode VT4; Wherein, the 4th triode VT4 is NPN type triode.
In adjustment module 20, voltage-stabiliser tube VZ provide reference voltage, resistance R4 provides operating current to voltage-stabiliser tube DZ, and the output voltage of the output of described reduction voltage circuit can be determined according to the resistance between the negative pole of the voltage between the base stage of described reference voltage, the 4th triode VT4 and emitter, resistance between the base stage of the 4th triode VT4 and the positive pole of the output of reduction voltage circuit and the base stage of the 4th triode VT4 and the output of reduction voltage circuit.When reduction voltage circuit input voltage produce fluctuation or other reasons and output voltage is raised time, the voltage at resistance R6 two ends raises, the base potential of the 4th triode VT4 is raised, voltage between collector electrode and emitter raises, 4th triode VT4 conducting degree increases, and the electric current of collector electrode increases.
Preferably, as shown in Figure 2, described sample resistance also comprises potentiometer RP, the first end (in Fig. 2, potentiometer RP identifying the port of " 1 ") of this potentiometer RP is connected with the 5th resistance R5, second end (in Fig. 2, potentiometer RP identifying the port of " 2 ") of potentiometer RP is connected with the 6th resistance R6, and the adjustable side (in Fig. 2, potentiometer RP identifying the port of " 3 ") of potentiometer RP is connected with the base stage of the 4th triode VT4.
As described above, the resistance between the positive pole of the base stage of the 4th triode VT4 and the output of reduction voltage circuit, the resistance between the base stage of the 4th triode VT4 and the negative pole of the output of reduction voltage circuit can affect the output voltage of the output of described reduction voltage circuit.When sample resistance only comprises the 5th resistance R5 and the 6th resistance R6, resistance between the positive pole of the base stage of the 4th triode VT4 and the output of reduction voltage circuit is the resistance of R5, and the resistance between the negative pole of the base stage of the 4th triode VT4 and the output of reduction voltage circuit is the resistance of R6, when sample resistance comprises the 5th resistance R5, during the 6th resistance R6 and potentiometer RP, resistance between the positive pole of the base stage of the 4th triode VT4 and the output of reduction voltage circuit is 1 of R5 resistance and RP, resistance sum between 3 ends, resistance between the negative pole of the base stage of the 4th triode VT4 and the output of reduction voltage circuit is 1 of R6 resistance and RP, resistance sum between 2 ends, by regulator potentiometer RP, resistance between the base stage of the resistance between the base stage of the 4th triode VT4 and the positive pole of output and the 4th triode VT4 and the negative pole of output is changed, thus regulate the output voltage of reduction voltage circuit further.
Further, as depicted in figs. 1 and 2, concussion switch module 10 can comprise switch element 11 and control unit 12, between the input that switch element 11 is connected to described reduction voltage circuit and output, control unit 12 is connected with adjustment module 20, for receiving the conditioning signal that adjustment module 20 sends, and the switching signal of the conduction duration of control switch unit 11 can be generated according to described conditioning signal.Control unit 12 controls switch element 11 according to the conditioning signal of adjustment module 20, and namely control unit 12 can control according to the ON time of described sampled voltage to switch element, thus improves degree of regulation.
Such as, when the voltage of the output of described reduction voltage circuit is greater than described preset value, the decision element 21 of adjustment module 20 judges that sampled voltage is greater than described default sampled voltage, adjustment module 20 can produce corresponding first conditioning signal and transfer to control unit 12, control unit 12 generates the first switching signal of control switch unit 11 conduction duration shortening according to described first conditioning signal, thus make the input of described reduction voltage circuit provide the time shorten of voltage, and then the voltage drop of the output of described reduction voltage circuit is low to moderate described preset value; Otherwise, when the voltage of the output of described reduction voltage circuit is less than described preset value, the decision element 21 of adjustment module 20 judges that sampled voltage is less than described default sampled voltage, adjustment module 20 can produce corresponding second conditioning signal, the second switch signal that the conduction duration that control unit 12 generates control switch unit 11 according to described second conditioning signal extends, thus the voltage of the output of described reduction voltage circuit is increased to described preset value.
Particularly, as shown in Figure 2, switch element 11 can comprise the first triode VT1, the second triode VT2, the 3rd triode VT3 and the first resistance R1, the base stage of the first triode VT1 is connected with the base stage of the emitter of the second triode VT2 and the 3rd triode VT3, the emitter of the first triode is connected with the positive pole of the input of described reduction voltage circuit, and the positive pole of the output of the collector electrode of the first triode and the first end of control unit 12 and described reduction voltage circuit is connected; The base stage of the second triode VT2 is connected with the collector electrode of the 3rd triode VT3, and the positive pole of the output of the collector electrode of the second triode VT2 and the first end of control unit 12 and described reduction voltage circuit is connected; The emitter of the 3rd triode VT3 is connected with the positive pole of the input of described reduction voltage circuit, the base stage of the 3rd triode VT3 is connected with the second end of control unit 12 and adjustment module 20, the collector electrode of the 3rd triode VT3 is connected with the negative pole of the input of described reduction voltage circuit by the first resistance R1, wherein, the first triode VT1, the second triode VT2 and the 3rd triode VT3 are PNP type triode.
When the input input voltage of described reduction voltage circuit, the emitter junction of the first triode VT1, the second triode VT2 and the 3rd triode VT3 is all forward biased and conducting, VT3 conducting makes the base potential of the first triode VT1 and the second triode VT2 increase, cause the reflection knot reverse bias of the first triode VT1, the second triode VT2, thus make the first triode VT1, the second triode VT2 ends.Now, the base current traffic organising unit 12 of the 3rd triode VT3, along with the voltage at the two ends of control unit 12 increases, the base potential of the 3rd triode VT3 be connected with control unit 12 increases, cause the 3rd triode VT3 to reflect knot reverse bias, thus the 3rd triode VT3 is ended.Along with the 3rd triode VT3 ends, the base potential of the second triode VT2 reduces, and the emitter junction forward bias of the first triode VT1 and the second triode VT2, the first triode VT1 and the second triode VT2 becomes conducting from cut-off.First triode VT1 and the second triode VT2 does not stop conversion, to form concussion between conducting and cut-off two states.
Further, as shown in Figure 2, control unit 12 can comprise the second resistance R2 and the second electric capacity C2, the first end of the second resistance R2 is connected with the collector electrode of the second triode VT2, second end of the second resistance R2 is connected with the first end of the second electric capacity C2, and second end of the second electric capacity C2 is connected with the base stage of the 3rd triode VT3 and adjustment module 20.
Control unit 12 is by the charging and discharging of the second electric capacity C2, the base potential of the 3rd triode VT3 can be changed, to change the conducting state of the 3rd triode VT3, thus change the conducting state of the first triode VT1, the second triode VT2 and the 3rd triode VT3.When the second electric capacity C2 charges and makes the base potential of the 3rd triode VT3 higher than threshold value, 3rd triode VT3 ends because emitter inverse is biased, thus make the first triode VT1 and the second triode VT2 conducting, simultaneously, second electric capacity C2 starts electric discharge, when the base potential of the 3rd triode VT3 is lower than threshold value, the 3rd triode VT3 conducting due to emitter junction forward bias, thus the first triode VT1 and the second triode VT2 is ended.Therefore, adjustment module 20 can by the cut-off duration regulating the velocity of discharge of the second electric capacity C2 to regulate the 3rd triode VT3, thus regulate the conduction duration of the first triode VT1 and the second triode VT2, and then regulate the output voltage of described reduction voltage circuit.
Further, as shown in Figure 1, described reduction voltage circuit can also comprise energy-storage module 30, the downstream of described concussion switch module is positioned between the both positive and negative polarity that this energy-storage module 30 is connected to the output of described reduction voltage circuit, in described concussion switch module conduction period, described energy-storage module can store the voltage inputted from the input of described reduction voltage circuit, when between concussion switch module 10 off period, energy-storage module 30 to the output output voltage of described reduction voltage circuit, thus keeps the stability of output voltage.
Particularly, as shown in Figure 2, energy-storage module 30 can comprise inductance L, the 3rd electric capacity C3 and fly-wheel diode VD, and the first end of inductance L is connected with the first end of the second resistance R2, and the second end of inductance L is connected with the output of described reduction voltage circuit; 3rd electric capacity C3 is connected in parallel between the both positive and negative polarity of the output of described reduction voltage circuit; The negative electrode of fly-wheel diode VD is connected with the first end of inductance L, and anode is connected with the positive pole of the input of reduction voltage circuit.
As the first triode VT1 and the second triode VT2 conducting, the input voltage of the input of reduction voltage circuit is the load supplying of inductance and output by the first triode VT1 and the second triode VT2, and by part electrical power storage in inductance L and the 3rd electric capacity C3.Charging current produces voltage at the 3rd electric capacity C3 two ends, and inductance L produces self-induction.Due to the self-induction action of inductance L, when making the first triode VT1 and the second triode VT2 conducting, it is slower that electric current increases.When the first triode VT1 and the second triode VT2 ends, due to the self-induction action of inductance L, electric current in holding circuit is constant, the load of inductance L, the 3rd electric capacity C3, fly-wheel diode VD and output forms closed-loop path, fly-wheel diode VD provide continuous current circuit, thus when making 10 conducting of earthquake switch module, the voltage of output can not sharply increase, when earthquake switch module 10 ends, the voltage of output also can not sharply reduce.
Further, as shown in Figure 2, reduction voltage circuit can also comprise the first electric capacity C1 between the positive pole of the input being connected to described reduction voltage circuit and negative pole, for the alternating component in filtering input voltage.
Below the course of work of described reduction voltage circuit is introduced.As shown in Figure 2, when the input input voltage of described reduction voltage circuit, first triode VT1, the second triode VT2 and the 3rd triode VT3 conducting due to emitter junction forward bias, 3rd triode VT2 is once conducting, the base potential of the second triode VT2 improves, thus the first triode VT1 and the second triode VT2 ends because emitter inverse is biased, and the base current of the 3rd triode VT3 is charged to the second electric capacity C2.Along with the increase of the second electric capacity C2 quantity of electric charge, the base potential of the 3rd triode VT3 improves, and cause the emitter inverse of the 3rd triode VT3 to be biased, the 3rd triode VT3 ends.Subsequently, the base potential of the second triode VT2 reduces, and the first triode VT1 and the second triode VT2 becomes conducting from cut-off, and the input of reduction voltage circuit is to the load supplying of inductance L, the 3rd electric capacity C3 and reduction voltage circuit output.Now, second electric capacity C2 is discharged by the second resistance R3, the 3rd resistance R3, the 4th triode VT4 and voltage-stabiliser tube DZ, the base potential of the 3rd triode VT3 is reduced, when the base potential of the 3rd triode VT3 is reduced to a certain degree, 3rd triode VT3 conducting again, first triode VT1 and the second triode VT3 ends, and inductance L starts to discharge to the output of reduction voltage circuit, to keep current stabilization.This process repeats, thus the voltage required for exporting at the output of reduction voltage circuit.
When the output voltage of reduction voltage circuit output is higher than preset value, 1 of 6th resistance R6 and potentiometer RP, the voltage also corresponding rising of 2 ends, the conducting degree of the 4th triode VT4 is increased, therefore in the process of the first triode VT1 and the second triode VT2 conducting, second electric capacity C2 increases through the 4th triode VT4 discharging current, discharge time shortens, thus the deadline of the 3rd triode VT3 is shortened, namely, the ON time of the first triode VT1 and the second triode VT2 shortens, the input of reduction voltage circuit shortens to output power-on time, and then output voltage is reduced.When the output voltage of reduction voltage circuit output is lower than preset value, 1 of 6th resistance R6 and potentiometer RP, the voltage also corresponding reduction of 2 ends, the conducting degree of the 4th triode VT4 is reduced, therefore in the process of the first triode VT1 and the second triode VT2 conducting, second electric capacity C2 reduces through the 4th triode VT4 discharging current, discharge time extends, thus the deadline of the 3rd triode VT3 is extended, the ON time of the first triode VT1 and the second triode VT2 extends, namely input extends to output power-on time, and then output voltage is raised.
It is more than the description to reduction voltage circuit provided by the present invention, can find out, adjustment module can regulate the conduction duration of concussion switch module, namely the duty ratio of the control signal of concussion switch module is regulated, thus the output voltage of the output being different from the described reduction voltage circuit of preset value can be adjusted to described preset value, the stability of output voltage thus can be kept by the adjustment of adjustment module.
As another aspect of the present invention, provide a kind of drive unit, this drive unit comprises above-mentioned reduction voltage circuit.This drive unit may be used in liquid crystal display, for driving chip provides stable voltage.
Be understandable that, the illustrative embodiments that above execution mode is only used to principle of the present invention is described and adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (12)
1. a reduction voltage circuit, this reduction voltage circuit comprises: concussion switch module, this concussion switch module is used for the output optionally conducting by the input of described reduction voltage circuit and described reduction voltage circuit, the input voltage of the input of described reduction voltage circuit is less than with the output voltage of the output making described reduction voltage circuit, it is characterized in that, described reduction voltage circuit also comprises adjustment module, this adjustment module is connected with described concussion switch module, for regulating the conduction duration of concussion switch module, preset value is adjusted to the output voltage of the output by described reduction voltage circuit.
2. reduction voltage circuit according to claim 1, it is characterized in that, described adjustment module comprises feedback end and decision element, described feedback end is for obtaining sampled voltage and being delivered to described decision element, described sampled voltage is based on the output voltage of the output of described reduction voltage circuit, when described decision element to judge that according to described sampled voltage the output voltage of the output of described reduction voltage circuit is different from described preset value, described adjustment module can generate conditioning signal.
3. reduction voltage circuit according to claim 2, is characterized in that, described adjustment module comprises sample resistance, and described sample resistance is in parallel with the output of described reduction voltage circuit, and described feedback end is electrically connected with the middle part of described sample resistance.
4. reduction voltage circuit according to claim 3, is characterized in that, described sample resistance comprises the 5th resistance and the 6th resistance of series connection, and described decision element comprises the 4th triode, the 3rd resistance, the 4th resistance and voltage-stabiliser tube,
The collector electrode of described 4th triode is connected with described concussion switch module by the 3rd resistance, the emitter of the 4th triode is connected with the positive pole of the output of described reduction voltage circuit by the 4th resistance, and the base stage of described 4th triode is connected between described 5th resistance and described 6th resistance;
The positive pole of described voltage-stabiliser tube is connected with the negative pole of the output of described reduction voltage circuit, and the negative pole of described voltage-stabiliser tube is connected with the emitter of described 4th triode.
5. reduction voltage circuit according to claim 4, it is characterized in that, described sample resistance also comprises potentiometer, the first end of this potentiometer is connected with described 5th resistance, second end of described potentiometer is connected with described 6th resistance, and the adjustable side of described potentiometer is connected with the base stage of described 4th triode.
6. reduction voltage circuit as claimed in any of claims 1 to 5, it is characterized in that, described concussion switch module comprises switch element and control unit, between the input that described switch element is connected to described reduction voltage circuit and output, described control unit is connected with described adjustment module, described control unit can receive the conditioning signal that described adjustment module sends, and can generate the switching signal of the conduction duration controlling described switch element according to described conditioning signal.
7. reduction voltage circuit according to claim 6, is characterized in that, described switch element comprises the first triode, the second triode, the 3rd triode and the first resistance,
The base stage of described first triode is connected with the base stage of the emitter of described second triode and the 3rd triode, the emitter of the first triode is connected with the positive pole of the input of described reduction voltage circuit, and the positive pole of the output of the collector electrode of the first triode and the first end of described control unit and described reduction voltage circuit is connected;
The base stage of described second triode is connected with the collector electrode of described 3rd triode, and the positive pole of the output of the collector electrode of described second triode and the first end of described control unit and described reduction voltage circuit is connected;
The emitter of described 3rd triode is connected with the positive pole of the input of described reduction voltage circuit, the base stage of the 3rd triode is connected with the second end of described control unit and described adjustment module, and the collector electrode of the 3rd triode is connected with the negative pole of the input of described reduction voltage circuit by the first resistance.
8. reduction voltage circuit according to claim 7, is characterized in that, described control unit comprises the second resistance and the second electric capacity,
The first end of described second resistance is connected with the collector electrode of described second triode, second end of described second resistance is connected with the first end of described second electric capacity, and the second end of described second electric capacity is connected with the base stage of described 3rd triode and described adjustment module.
9. reduction voltage circuit as claimed in any of claims 1 to 5, it is characterized in that, described concussion switch module comprises energy-storage module, the downstream of described concussion switch module is positioned between the both positive and negative polarity that this energy-storage module is connected to the output of described reduction voltage circuit, described energy-storage module can store in described concussion switch module conduction period the voltage inputted from the input of described reduction voltage circuit, and to the output output voltage of described reduction voltage circuit between the described concussion switch module off period, to stablize the output output voltage of described reduction voltage circuit.
10. reduction voltage circuit according to claim 9, is characterized in that, described energy-storage module comprises inductance, the 3rd electric capacity and fly-wheel diode,
The first end of described inductance is connected with the first end of described second resistance, and the second end of described inductance is connected with the output of described reduction voltage circuit;
Described 3rd Capacitance parallel connection is between the both positive and negative polarity of the output of described reduction voltage circuit;
The negative electrode of described fly-wheel diode is connected with the first end of described inductance, and anode is connected with the positive pole of the input of described reduction voltage circuit.
11. reduction voltage circuits as claimed in any of claims 1 to 5, is characterized in that, described reduction voltage circuit also comprises the first electric capacity between the both positive and negative polarity of the input being connected to described reduction voltage circuit.
12. 1 kinds of drive units, is characterized in that, this drive unit comprises the reduction voltage circuit in claim 1 to 11 described in any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410453371.5A CN104242633B (en) | 2014-09-05 | 2014-09-05 | Reduction voltage circuit and driving means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410453371.5A CN104242633B (en) | 2014-09-05 | 2014-09-05 | Reduction voltage circuit and driving means |
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| CN104242633A true CN104242633A (en) | 2014-12-24 |
| CN104242633B CN104242633B (en) | 2016-11-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107834852A (en) * | 2017-11-28 | 2018-03-23 | 浙江水利水电学院 | A kind of reduction voltage circuit |
| CN110314309A (en) * | 2019-05-14 | 2019-10-11 | 北京戴纳实验科技有限公司 | A kind of laboratory fire-fighting robot |
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| CN101669271A (en) * | 2007-04-27 | 2010-03-10 | 皇家飞利浦电子股份有限公司 | Self-oscillating switch circuit and a driver circuit comprising such a switch circuit |
| CN102006703A (en) * | 2010-12-03 | 2011-04-06 | 何志雄 | Light-emitting diode (LED) lamp driving power supply |
| CN102801309A (en) * | 2011-05-24 | 2012-11-28 | 欧司朗股份有限公司 | Self-oscillating buck converter |
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| US6239585B1 (en) * | 1997-12-08 | 2001-05-29 | Robert N. Buono | Self-oscillating switch-mode DC to DC conversion with current switching threshold hysteresis |
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| TW200919921A (en) * | 2007-06-29 | 2009-05-01 | Koninkl Philips Electronics Nv | Synchronous self-driven power converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834852A (en) * | 2017-11-28 | 2018-03-23 | 浙江水利水电学院 | A kind of reduction voltage circuit |
| CN110314309A (en) * | 2019-05-14 | 2019-10-11 | 北京戴纳实验科技有限公司 | A kind of laboratory fire-fighting robot |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104242633B (en) | 2016-11-02 |
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