CN1578575A - Electric power control device - Google Patents
Electric power control device Download PDFInfo
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- CN1578575A CN1578575A CNA2004100622542A CN200410062254A CN1578575A CN 1578575 A CN1578575 A CN 1578575A CN A2004100622542 A CNA2004100622542 A CN A2004100622542A CN 200410062254 A CN200410062254 A CN 200410062254A CN 1578575 A CN1578575 A CN 1578575A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
- H05B39/04—Controlling
- H05B39/08—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/39—Controlling the intensity of light continuously
- H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
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Abstract
Provided is a light control device in which occurrence of flickering of brightness due to an ignition failure of a thyristor at a light loading is prevented. The light control device has a first phase control circuit (PC1) provided with self arc-extinguishing type control elements (Q1, Q2), and a second phase control circuit (PC2) provided with the thyristors (T1, T2). Furthermore, this is equipped with a control means (CC) which is constituted so that the self arc-extinguishing type control elements (Q1, Q2) of the first phase control circuit (PC1) are actuated by a gradient control at a desired phase of an AC voltage half wave, and next, when its conduction reaches a nearly saturated state, so that a short time trigger signal which continues for an ignition required time and discontinues only after a reset time is ensured before the AC voltage half wave is finished is supplied to the thyristors (T1, T2) of the second phase control circuit (PC2), and so that the self arc-extinguishing type control elements (Q1, Q2) are turned on.
Description
Technical field
The present invention relates to a kind of power control unit, particularly relate to a kind of first phase-control circuit and power control unit that has from the control element that opens circuit that comprise with second phase-control circuit of thyristor adjuster.
Background technology
Be connected in parallel to have from first phase-control circuit of the control element that opens circuit and have second phase-control circuit of thyristor adjuster and connect and be plugged between AC power and the load, on the hope phase place of alternating voltage half-wave, make the control element action of opening circuit certainly of first phase-control circuit by the control of tilting, the power control unit that makes its build-up of luminance carry out light modulating device that phase control successively constitutes like this etc. by the thyristor adjuster that triggering signal is offered second phase-control circuit when its conducting is roughly saturated is known (for example, with reference to patent documentation 1 claim 5 and Figure 12).
According to patent documentation 1, the control owing to when phase control begins successively, tilt, so suppressed the generation that load and series connection are inserted into the acoustic noise of the reactor in the load circuit, simultaneously, after the control of tilting, since by opening the less relatively thyristor adjuster of resistance mainly at thyristor adjuster effluent overload electric current, so the heating of adjusting device reduces.
[patent documentation 1] spy opens flat 6-338395 communique
In the prior art shown in the patent document 1, under underloaded situation, owing to do not flow through the required sufficient trigger current of thyristor adjuster build-up of luminance, so when having the thyristor adjuster not open, thus constitute should avoid this situation continue to flow through the terminal of the triggering signal of thyristor adjuster up to the alternating voltage half-wave.
In the above-mentioned prior art, become next half-wave even there is the polarity inversion of alternating voltage, the situation that the thyristor adjuster continues as out is so exist the problem that brightness flicker is arranged in the load at this moment.In contrast, as is known, if with the load dummy resistance device that is connected in parallel, even do not supply with the terminal of lasting triggering signal as mentioned above like that, also can the thyristor adjuster reliably be opened up to the alternating voltage half-wave.But, in this formation, have power consumption and increase, the problem of cost raising simultaneously.
This shows that above-mentioned existing power control device obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem that power control unit exists, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.
Because the defective that above-mentioned existing power control device exists, 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 founding a kind of power control unit of new structure, can improve general existing power control device, make it have more practicality.Through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.
Summary of the invention
The objective of the invention is to, overcome the defective that the existing power control device exists, technical problem to be solved provides a kind of power control unit that can prevent to take place the brightness flicker that the build-up of luminance failure because of the thyristor adjuster causes when underload of new structure.
The purpose of invention and to solve its technical problem be to adopt following technical scheme to realize.According to a kind of power control unit that the present invention proposes, this power control unit comprises: first phase-control circuit is inserted into AC power cord, and has the control element that opens circuit certainly of phase control alternating voltage; Second phase-control circuit is inserted into AC power cord, and has the thyristor adjuster of phase control alternating voltage; And control unit, it constitutes the control element action of opening circuit certainly that makes first phase-control circuit on the hope phase place of alternating voltage half-wave by the control of tilting, then, when its conducting becomes roughly saturation condition, thyristor adjuster to second phase-control circuit is supplied with the short time triggering signal, to continue the build-up of luminance required time and before the termination of alternating voltage half-wave, to guarantee at least just to stop resetting time, simultaneously, make from opening circuit control element for opening.
The object of the invention to solve the technical problems also adopts following technical scheme to realize.According to a kind of power control unit that the present invention proposes, this power control unit comprises: first phase-control circuit is inserted into AC power cord, and has the control element that opens circuit certainly of phase control alternating voltage; Second phase-control circuit is inserted into AC power cord, and has the thyristor adjuster of phase control alternating voltage; Detecting unit detects indirectly or directly corresponding to by the signal of the output of phase control; And control unit, it constitutes the control element action of opening circuit certainly that makes first phase-control circuit on the hope phase place of alternating voltage half-wave by the control of tilting, then, when its conducting becomes roughly saturation condition, thyristor adjuster to second phase-control circuit is supplied with triggering signal, simultaneously, when during smaller or equal to predetermined value, only carrying out phase control by first phase-control circuit by the detected signal of detecting unit.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, in order to reach aforementioned goal of the invention, major technique of the present invention thes contents are as follows:
According to the power control unit of the present invention of claim 1, it is characterized in that it comprises: first phase-control circuit is inserted into AC power cord, and has the control element that opens circuit certainly of phase control alternating voltage; Second phase-control circuit is inserted into AC power cord, and has the thyristor adjuster of phase control alternating voltage; Control unit, constitute the control element action of opening circuit certainly that on the hope phase place of alternating voltage half-wave, makes first phase-control circuit by the control of tilting, then, when its conducting becomes roughly saturation condition, supply continues the build-up of luminance required time to the thyristor adjuster of second phase-control circuit, and before the termination of alternating voltage half-wave, guarantee the short time triggering signal that just stops resetting time at least, simultaneously, make from opening circuit control element for opening.
The present invention and below each invention in, the definition and the art-recognized meanings of the term that limits especially are not as follows.The structure of the so-called light modulation unit of the power circuit part that it is inscape that power control unit of the present invention relates to phase-control circuit and the direct control unit of controlling this circuit, the adjusting control circuits that in fact most interpolation tissues throw light on partly use.But the present invention is not limited to this combination.
＜about first phase-control circuit〉first phase-control circuit comprises from the control element that opens circuit, and controls the phase control that beginning is undertaken by phase control successively on the hope phase place of alternating voltage half-wave by control unit described later.As the control element that opens circuit certainly, for example can use IGBT, MOSFET, SIT etc.And, when phase control successively, make the rising edge of electric current tilt to increase, the so-called control of tilting is to carry out linear opening action in other words.
The circuit structure that the phase control AC supply voltage is used is not limited to specific circuit.
For example, to be connected in series a pair of from the control element that opens circuit with can using reversed polarity, a pair of from control element reversed polarity the structure between the structure of diode and the relative a pair of summit that is connected to diode bridge from the control element that opens circuit etc. that is connected in parallel respectively that opens circuit.
＜about second phase-control circuit〉second phase-control circuit is inserted into AC power cord, is included in the hope phase place of alternating voltage half-wave, then first phase-control circuit is carried out the thyristor adjuster of opening action control by control unit described later.In addition, the circuit structure used of phase control AC supply voltage is not limited to specific circuit.
Typically, can use reverse parallel connection to connect formation of a pair of thyristor adjuster etc.
＜about control unit〉control unit such as following illustrated coordination control first and second phase-control circuits.Promptly, in the hope phase place of alternating voltage half-wave, at first, by its control element that opens circuit certainly of control that tilts, and first phase-control circuit is moved, then, when its conducting is a load current when becoming roughly saturation condition, the short time triggering signal is supplied with the laggard line phase control action of thyristor adjuster of second phase control signal.In addition, in the present invention, so-called " short time triggering signal " is meant the needed time of build-up of luminance that continues the thyristor adjuster, before the alternating voltage half-wave stops, can guarantee that at least conduct is from stopping to open the short triggering signal of relative duration of the resetting time of needed time before to the thyristor adjuster after the triggering signal.
In addition, control signal is supplied with the thyristor adjuster with the short time triggering signal, simultaneously, at least at this moment opens from opening circuit control element.
Follow first phase-control circuit of the above-mentioned formation of control unit during the short time triggering signal of supplying with the thyristor adjuster, to close, simultaneously, also can when the termination of short time triggering signal, roughly reopen simultaneously.In addition, also can during the short time triggering signal of the supply thyristor adjuster that then tilts to control, also continue to open.Its reason is, because the voltage drop of control element when its conducting of opening circuit certainly is bigger than thyristor adjuster, so also can open control thyristor adjuster during opening.
＜about effect of the present invention〉among the present invention, by having above-mentioned formation, phase control is carried out in action coordinated with each other to first and second phase-control circuits by control unit control.That is, in the alternating voltage half-wave, initial first phase-control circuit begins the phase control of load current by tilting action work.In first phase-control circuit,, then the thyristor adjuster of second phase-control circuit is supplied with the short time triggering signal from control unit if the conducting of the control element that opens circuit certainly is that load current is roughly saturated.If load is little, if i.e. underload, then the thyristor adjuster is opened during triggering signal supplying with the short time.If the thyristor adjuster is opened, for example, even the control element that opens circuit certainly continues to open, load current also can flow through in the thyristor adjuster of voltage drop than the second little phase-control circuit of control circuit that opens circuit certainly when conducting.
After the alternating voltage half-wave stops, when its polarity inversion, owing to the short time triggering signal stops, and also passed through resetting time, so the thyristor adjuster cuts out automatically and reliably.
If action same as described above is then carried out in the polarity inversion of alternating voltage and become next half-wave again repeatedly in the alternating voltage half-wave of opposite polarity.Like this, carry out the phase control of load, that is, and light modulation.
Then, phase control under the light load condition is described.That is, in this case, because supply thyristor adjuster is the short time triggering signal, the thyristor adjuster does not reach the self-sustaining electric current, so do not open.But even in this case, control action is opened or reopen when the short time triggering signal stops because the control element that opens circuit certainly of first phase-control circuit is followed, so the control element that opens circuit certainly replaces carrying out phase control.As mentioned above, though the voltage drop the when control element that opens circuit is certainly opened is bigger than thyristor adjuster, owing to be underload, so it is no problem to generate heat.
If arrangement feature of the present invention described above, as described below.
Even 1, the thyristor adjuster is not opened during underload, the control element that opens circuit certainly replaces carrying out phase control automatically.Therefore, can prevent from not open the generation of the brightness flicker that causes because of the thyristor adjuster.
2, because triggering signal is the short time triggering signal, so when the polarity inversion of alternating voltage, can prevent the continuous opening action of thyristor adjuster.Therefore, can prevent the generation of the brightness flicker that the continuous opening action because of the thyristor adjuster causes.
3, other features
(1), can adopt the less control element that opens circuit certainly of load current value.The load current that first phase-control circuit is born do not replace carrying out phase control when the thyristor adjuster is opened during owing to opening action that carries out from the control element that opens circuit being undertaken by the control of tilting and underload, so can be set forr a short time.Therefore, can adopt the less control element that opens circuit certainly of load current value.
(2), load does not produce acoustic noise.By the inclination control that the control element that opens circuit certainly by first phase-control circuit carries out, the rising of load current slows down (di/dt diminishes), and load does not produce acoustic noise.
(3), the control element that opens circuit certainly be difficult to destroy.Owing to can allow to use below the current value in maximum instantaneous usually from the control element that opens circuit, the control element that opens circuit certainly be difficult to destroy.
(4), thyristor adjuster that need be when not opening underload and the dummy resistance device that is not connected in parallel with load.
According to the power control unit of the present invention of claim 2, it is characterized in that it comprises: first phase-control circuit, be inserted into AC power cord, have the control element that opens circuit certainly of phase control alternating voltage; Second phase-control circuit is inserted into AC power cord, has the thyristor adjuster of phase control alternating voltage; Detecting unit detects the signal corresponding to the output after the phase control indirectly or directly; Control unit, constitute the control element action of opening circuit certainly that on the hope phase place of alternating voltage half-wave, makes first phase-control circuit by the control of tilting, then, when its conducting becomes roughly saturation condition, thyristor adjuster to second phase-control circuit is supplied with triggering signal, simultaneously, when during smaller or equal to predetermined value, only carrying out phase control by first phase-control circuit by the detected signal of detecting unit.
＜about first phase control unit first phase control unit controls by control unit described later, and the phase control of bearing alternating voltage when rising and the phase control during underload whole.
＜about second phase control unit〉second phase control unit constitutes at the rising consequence of the phase control of alternating voltage and undertakes current-carrying circulation, be failure to actuate when underload.
＜about detecting unit〉detecting unit can allow to detect load current, can allow to detect dim signal or output power etc. and directly or indirectly detect signal corresponding to the output after the phase control.Further, even when constituting the detection load current, its concrete means also are not limited to specific structure.For example, can suitably use current transformer, current detecting resistor, semi-conductor electricity current sensor etc.Further, if the insertion position of load current detecting unit can detect load current, then be not limited to specific circuit position.For example, preferably series connection is inserted between the output and first and second phase-control circuits of light modulating device.But,, also a pair of current detecting unit can be connected in series to first and second phase-control circuits respectively and come decentralized configuration if need.
＜about control unit control unit control respectively aspect first and second phase-control circuits identical with the invention of claim 1, though supply with the preferably same short time triggering signal of triggering signal of the thyristor adjuster of second phase-control circuit with the invention of claim 1, but, even with Patent Document 1 same until near the continuous trigger signal the terminal of alternating voltage half-wave also can be guaranteed reseting period.
In addition, control unit smaller or equal to predetermined value, when being underload, only makes the action of first phase-control circuit in the load size of being obtained according to the detection data of detecting unit.Here, also can be by not supplying with triggering signal for the thyristor adjuster, do not make the action of second phase-control circuit, for example, also triggering signal can be supplied with its thyristor adjuster, make the action starting voltage of the thyristor adjuster and the control element that opens circuit certainly different, thereby substantially only make the action of first phase-control circuit.In addition, in order to make first phase-control circuit action, though supply with the drive signal for the control element that opens circuit certainly, the control of also can then tilting continues to supply with drive signal, also can be in supply drive signal in back during the blocking of short time.Further, so-called " signal that is detected by detecting unit smaller or equal to predetermined value time " is meant that the predetermined value relevant with the big or small degree of load suitably is provided with according to hope.For detecting unit detects load current, what be set in rated current is value appropriate in practicality below 20%.
Further, outside the control of tilting the time, similarly control first phase-control circuit during with underload during load that control unit can be outside underload.But, also can first phase-control circuit be failure to actuate according to hope.
＜about effect of the present invention〉the present invention is because of having said structure, no matter loading level how, by the control of being undertaken by control unit when the rising of phase control, the control element that opens circuit certainly by first phase-control circuit is controlled, the thyristor adjuster of second phase-control circuit was opened when its conducting was roughly saturated, so the thyristor adjuster has been born the circulation of opening later load current, and carries out phase control.
Action when then, underload being described.That is, when by the detected detection data of detecting unit during smaller or equal to the value that sets in advance, the thyristor adjuster of second phase-control circuit is failure to actuate in fact.In addition, simultaneously the control element that opens circuit certainly of first phase-control circuit is supplied with drive signal.As a result, when underload, only carry out phase control by first phase-control circuit.Therefore, can prevent the brightness flicker that produces because of the failure of the build-up of luminance of thyristor adjuster.In addition, open circuit control element certainly as mentioned above, though the voltage drop during conducting is bigger than thyristor adjuster, owing to be underload, so do not have the problem in the practicality that brings because of heating.
If arrangement feature of the present invention described above, as described below.
1, do not open the thyristor adjuster during underload, and carry out phase control, therefore can prevent from not open the generation of the brightness flicker that causes because of the thyristor adjuster by first phase control element with the circuit component of autotomying.
2, since the phase control of being undertaken by the circuit component of autotomying of first phase-control circuit only when underload, carry out, so do not have problem in the practicality that brings because of heating.
3, other features
(1), can adopt the less control element that opens circuit certainly of load current value.Phase control during owing to opening action that carries out from the control element that opens circuit being undertaken by the control of tilting and underload is so can be provided with the load current that first phase-control circuit is born forr a short time.
Therefore, can adopt the less control element that opens circuit certainly of load current value.
(2), load does not produce acoustic noise.By the inclination control that the control element that opens circuit certainly by first phase-control circuit carries out, the rising of load current slows down (di/dt diminishes), and load does not produce acoustic noise.
(3), the control element that opens circuit be difficult to destroy.Owing to can allow to use below the current value in maximum instantaneous usually from the control element that opens circuit, the control element that opens circuit certainly be difficult to destroy.
(4), thyristor adjuster that need be when not opening underload and the dummy resistance device that is connected in parallel with load.
Via as can be known above-mentioned, a kind of power control unit that the present invention proposes is the power power control unit of the brightness flicker that causes of a kind of build-up of luminance failure that can prevent to take place when underload because of rectifier thyristor adjuster.Light modulating device comprises having from opening circuit control element Q1, the first phase-control circuit PC1 of Q2, has thyristor adjuster T1, the second phase-control circuit PC2 of T2, constitute the control element Q1 that opens circuit certainly that wishes to make by the control of tilting on the phase place the first phase-control circuit PC1 at the half-wave of alternating voltage, the Q2 action, then when its conducting becomes roughly saturation condition, supply is to the thyristor adjuster T1 of the second phase-control circuit PC2, T2 continues the build-up of luminance required time, and the short time triggering signal that just stops after before the alternating voltage half-wave stops, guaranteeing resetting time at least, simultaneously, make from opening circuit control element Q1, the control unit CC that Q2 opens.
By technique scheme, power control unit of the present invention has following advantage and effect at least:
According to the invention of claim 1,, have from opening circuit control element by comprising first phase-control circuit; Second phase-control circuit has the thyristor adjuster; Control unit, constitute the control element action of opening circuit certainly that on the hope phase place of alternating voltage half-wave, makes first phase-control circuit by the control of tilting, then, when its conducting becomes roughly saturation condition, supply continues the build-up of luminance required time to the thyristor adjuster of second phase-control circuit, and the short time triggering signal that just stops guarantee resetting time at least before the alternating current half-wave stops after simultaneously, makes from opening circuit control element for opening; Thereby can provide a kind of power control unit that when underload, prevents the brightness flicker that causes because of the failure of the build-up of luminance of thyristor adjuster.
According to the invention of claim 2, by comprising first phase-control circuit, be inserted into AC power cord, and have the control element that opens circuit certainly of phase control alternating voltage; Second phase-control circuit is inserted into AC power cord, and has the thyristor adjuster of phase control alternating voltage; Detecting unit detects the signal corresponding to the output after the phase control directly or indirectly; Control unit, constitute the control element action of opening circuit certainly that on the hope phase place of alternating voltage, makes first phase-control circuit by the control of tilting, then, when its conducting becomes roughly saturation condition, thyristor adjuster to second phase-control circuit is supplied with triggering signal, simultaneously, at the signal that detects by detecting unit during smaller or equal to predetermined value, only carry out phase control, thereby a kind of power control unit that prevents the brightness flicker that causes because of the failure of the build-up of luminance of thyristor adjuster when underload can be provided by first phase-control circuit.
In sum, the power control unit of special construction of the present invention is the power control unit of the brightness flicker that causes of a kind of build-up of luminance failure that can prevent from when underload to take place because of the thyristor adjuster.It has above-mentioned many advantages and practical value, and in like product, do not see have similar structural design to publish or use and really genus innovation, no matter it structurally or bigger improvement all arranged on the function, have technically than much progress, and produced handy and practical effect, and have the multinomial effect of enhancement than the existing power control device, thus be suitable for practicality more, and have the extensive value of industry, really be 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 going out a plurality of preferred embodiments, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the circuit block diagram of first embodiment of the light modulating device of expression power control unit of the present invention.
Fig. 2 is the action voltage current waveform schematic diagram regularly of identical each one of explanation.
Fig. 3 is each action voltage current waveform schematic diagram regularly that second embodiment of the light modulating device of representing power control unit of the present invention is described.
Fig. 4 is the circuit block diagram of the 3rd embodiment of expression power control unit of the present invention.
Fig. 5 is the action voltage current waveform schematic diagram regularly of identical each one of explanation.
Fig. 6 is the action flow chart of expression same phase control circuit.
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, to its embodiment of power control unit, structure, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
See also illustrated in figures 1 and 2ly, Fig. 1 and Fig. 2 represent that Fig. 1 is a circuit block diagram as the light modulating device of first embodiment of power control unit of the present invention, and Fig. 2 is the action voltage and current waveform regularly of each one of explanation.Present embodiment is the invention corresponding to claim 1.Among Fig. 1, AS is an AC power, and DM is a light modulating device, and IL is load.
AC power AS is made of industrial AC power.
Modulating device DM is made of the first phase-control circuit PC1, the second phase-control circuit PC2 and control unit CC, and a pair of AC power cord 11,12 and the load IL of input through extending from the two poles of the earth of AC power AS is connected to AC power AS.
First phase-control circuit PC1 series connection is inserted on the AC power cord 11, comprises the control element that opens circuit certainly of phase control alternating voltage.In the present embodiment, constitute from open circuit control element Q1, Q2 and pair of diodes D1, D2 by a pair of.And a pair of control element Q1, the Q2 of opening circuit certainly for example is made of IGBT, is reversed polarity each other, and is connected in series on the AC power cord 11.
In addition, pair of diodes D1, D2 are connected on separately open circuit certainly control element Q1, the Q2 for reverse parallel connection.
The same series connection of the second phase-control circuit PC2 is inserted on the AC power cord 11, therefore, is connected in parallel with the first phase-control circuit PC1, and comprises the thyristor adjuster of phase control alternating voltage.In the present embodiment, constitute by a pair of thyristor adjuster T1, T2.And a pair of thyristor adjuster T1, T2 reverse parallel connection each other connect.
Control unit CC constitutes and comprises microcomputer, energy is provided and moves from AC power AS, is controlled to be and makes the first and second phase-control circuit PC1, PC2 cooperation.That is,, carry out phase control at first by the control generation of tilting based on the first phase-control circuit PC1 for the supply voltage half-wave.When the conducting of open circuit certainly control element Q1, Q2 be load current roughly saturated after, thyristor adjuster T1, the T2 of the second phase-control circuit PC2 are supplied with the triggering signal of short time and when opening thyristor adjuster T1, T2, the second phase-control circuit PC2 replaces the first phase-control circuit PC1 to carry out phase control.
Load IL is made of incandescent lamp.
Then, see also shown in Figure 2ly, the circuit operation of the light modulating device of present embodiment is described.In addition, among Fig. 2, (a) schematically illustrate the AC supply voltage waveform, (b) schematically illustrate drive signal current, (c) schematically illustrate short time triggering signal current waveform, (d) schematically illustrate the phase control output voltage waveforms from the control element that opens circuit.
Promptly, if in the control terminal circuit of control element Q1 that opens circuit certainly, flow through the first signal section A of initial leading-edge droop in the positive polarity drive signal current shown in Fig. 2 (b) on the hope phase place of the alternating voltage half-wave of the sine wave shown in Fig. 2 (a), then begin tilting action from the inclination of control element Q1 of opening circuit with the first signal section A, load current is at the utmost point of AC power AC upside in Fig. 1, AC power cord 11, from the control element Q1 that opens circuit, diode D2, load IL, the top, path of the utmost point of downside in Fig. 1 of AC power cord 12 and AC power AC is flow through, the load current limit increases successively, and the tilting action when carrying out the phase control rising edge.
If load current is roughly saturated, control unit CC then stops the first signal section A, simultaneously, flows through the short time triggering signal electric current shown in Fig. 2 (c) in the grid circuit of thyristor adjuster T1.Thus, because current thyristor adjuster T1 opens, so apply the phase control output voltage shown in Fig. 2 (d) to load IL, load current flows through instead of the thyristor adjuster T1 from the second phase-control circuit P2 from the first phase-control circuit PC1 thereupon, in addition also flows through above-mentioned path.
If short time triggering signal electric current stops, then thyristor adjuster T1 is for keeping open mode.And control unit CC flows through the drive current of the control element Q1 that opens circuit certainly of the first phase-control circuit PC1 again shown in the second portion B of Fig. 2 (b), so the control element Q1 that opens circuit certainly reopens.But, diminish owing to be parallel-connected to the voltage drop of the thyristor adjuster T1 of the control element Q1 that opens circuit certainly, so load current does not flow through from opening circuit control element Q1.
Therefore, even when not opening thyristor adjuster T1 by short time triggering signal electric current when underload is arranged, also can replace thyristor adjuster T1, and in the control element Q1 that opens circuit certainly, flow through load current.
Like this, if alternating voltage polarity inversion, and the half-wave of opposite polarity is applied between the AC power cord 11,12, open circuit certainly control element Q2 and the diode D1 of the current first phase-control circuit PC1 open, the thyristor adjuster T2 of the second phase-control circuit PC2 opens, shown in the right half part of Fig. 2, with above-mentioned same action.As a result, the half-wave every each polarity of alternating voltage carries out phase control.
Seeing also shown in Figure 3ly, is the action voltage and current waveform regularly of each one of second embodiment of the light modulating device of explanation expression power control unit of the present invention.Give same Reference numeral and omit explanation for the part identical with Fig. 2.Present embodiment is the invention corresponding to claim 1.
That is, present embodiment link to each other different for existing aspect the A of Fig. 2 first of the drive signal current of the control element Q1 that opens circuit certainly of the first phase-control circuit PC1 and the second portion B.In addition, circuit operation is substantially the same with first embodiment.
See also Fig. 4 and shown in Figure 5, expression is as the 3rd embodiment of the light modulating device of power control unit of the present invention, and Fig. 4 is a circuit block diagram, and Fig. 5 is the action voltage and current waveform regularly of each one of explanation.In addition, among each figure, the part identical with Fig. 1 and Fig. 2 given same Reference numeral and omitted explanation.Present embodiment is corresponding to claim 2.
That is, in the present embodiment, have load current detecting unit CD and be used as detecting unit, it is detected Data Control be input to control unit CC.This load current detecting unit CD is made of current transformer, and magnetic coupling is to AC power cord 11 between the first and second phase-control circuit PC1, PC2 and load IL.And, detect load current, and control is input to control unit CC described later.
Like this, smaller or equal to predetermined value, then shown in the flow chart of Fig. 6, control unit CC stops the supply to the triggering signal electric current of thyristor adjuster T1, the T2 of the second phase-control circuit PC2 as if load current.Therefore, open circuit certainly control element Q1, the Q2 of the first phase-control circuit PC1 replace carrying out phase control.
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 the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (2)
1, a kind of power control unit is characterized in that this power control unit comprises:
First phase-control circuit is inserted into AC power cord, and has the control element that opens circuit certainly of phase control alternating voltage;
Second phase-control circuit is inserted into AC power cord, and has the thyristor adjuster of phase control alternating voltage;
Control unit, it constitutes the control element action of opening circuit certainly that makes first phase-control circuit on the hope phase place of alternating voltage half-wave by the control of tilting, then, when its conducting becomes roughly saturation condition, thyristor adjuster to second phase-control circuit is supplied with the short time triggering signal, to continue the build-up of luminance required time and before the termination of alternating voltage half-wave, to guarantee at least just to stop resetting time, simultaneously, make from opening circuit control element for opening.
2, a kind of power control unit is characterized in that this power control unit comprises:
First phase-control circuit is inserted into AC power cord, and has the control element that opens circuit certainly of phase control alternating voltage;
Second phase-control circuit is inserted into AC power cord, and has the thyristor adjuster of phase control alternating voltage;
Detecting unit detects indirectly or directly corresponding to by the signal of the output of phase control;
Control unit, it constitutes the control element action of opening circuit certainly that makes first phase-control circuit on the hope phase place of alternating voltage half-wave by the control of tilting, then, when its conducting becomes roughly saturation condition, thyristor adjuster to second phase-control circuit is supplied with triggering signal, simultaneously, when during smaller or equal to predetermined value, only carrying out phase control by first phase-control circuit by the detected signal of detecting unit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003192021 | 2003-07-04 | ||
| JP2003192021A JP4370832B2 (en) | 2003-07-04 | 2003-07-04 | Light control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1578575A true CN1578575A (en) | 2005-02-09 |
Family
ID=34189431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004100622542A Pending CN1578575A (en) | 2003-07-04 | 2004-07-02 | Electric power control device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4370832B2 (en) |
| KR (1) | KR100628622B1 (en) |
| CN (1) | CN1578575A (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4864994B2 (en) | 2009-03-06 | 2012-02-01 | シャープ株式会社 | LED drive circuit, LED illumination lamp, LED illumination device, and LED illumination system |
| JP4943487B2 (en) | 2009-10-26 | 2012-05-30 | シャープ株式会社 | LED drive circuit, LED illumination lamp, LED illumination device, and LED illumination system |
| JP2011165394A (en) | 2010-02-05 | 2011-08-25 | Sharp Corp | Led drive circuit, dimming device, led illumination fixture, led illumination device, and led illumination system |
| JP5031865B2 (en) | 2010-03-23 | 2012-09-26 | シャープ株式会社 | LED drive circuit, LED illumination lamp, LED illumination device, and LED illumination system |
| JP5043213B2 (en) | 2010-08-23 | 2012-10-10 | シャープ株式会社 | LED drive circuit and LED illumination lamp using the same |
| JP5079855B2 (en) | 2010-08-24 | 2012-11-21 | シャープ株式会社 | LED drive circuit and LED illumination lamp using the same |
| JP5214694B2 (en) | 2010-09-22 | 2013-06-19 | シャープ株式会社 | LED drive circuit, LED illumination lamp, LED illumination device, and LED illumination system |
| WO2012039070A1 (en) * | 2010-09-24 | 2012-03-29 | Hirota Shingen | Non-blinking light-emission maintaining method for led dimmer, and non-blinking light-emission maintaining apparatus for led dimmer |
| JP5476325B2 (en) | 2011-02-28 | 2014-04-23 | シャープ株式会社 | LED drive circuit, LED illumination lamp, LED illumination device, and LED illumination system |
| JP5331154B2 (en) | 2011-04-27 | 2013-10-30 | シャープ株式会社 | LED driving circuit and LED illumination lamp |
| JP5411918B2 (en) | 2011-11-30 | 2014-02-12 | シャープ株式会社 | LED driving circuit and LED illumination lamp |
-
2003
- 2003-07-04 JP JP2003192021A patent/JP4370832B2/en not_active Expired - Fee Related
-
2004
- 2004-07-02 KR KR1020040051538A patent/KR100628622B1/en not_active IP Right Cessation
- 2004-07-02 CN CNA2004100622542A patent/CN1578575A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005026142A (en) | 2005-01-27 |
| JP4370832B2 (en) | 2009-11-25 |
| KR20050004105A (en) | 2005-01-12 |
| KR100628622B1 (en) | 2006-09-26 |
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