CN104202886A - Thyristor holding current compensation circuit - Google Patents
Thyristor holding current compensation circuit Download PDFInfo
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- CN104202886A CN104202886A CN201410481813.7A CN201410481813A CN104202886A CN 104202886 A CN104202886 A CN 104202886A CN 201410481813 A CN201410481813 A CN 201410481813A CN 104202886 A CN104202886 A CN 104202886A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention provides a thyristor holding current compensation circuit. On-state current or the output voltage of a rectifying circuit are sampled and differentially processed to obtain a differential signal, when the change rate of the on-state current or the output voltage of the rectifying circuit is large, corresponding large compensation current is generated according to the differential signal; when the change rate of the on-state current or the output voltage of the rectifying circuit is small, corresponding small compensation current is generated, the sum of load current and the compensation current is allowed to be larger than holding current, and abnormal turn-off of a thyristor is avoided. The thyristor holding current compensation circuit has the advantages that the holding current change caused by impulse and oscillation when the thyristor is on is considered, the size of the compensation current is dynamically adjusted according to the impulse and the oscillation, the problem of LED lamp flickering when the impulse and the oscillation exist in the on-state current is solved, and application efficiency of the compensation circuit is increased.
Description
Technical field
The present invention relates to circuit engineering field, relate in particular to a kind of controllable silicon and maintain current compensation circuit.
Background technology
At present, utilizing controllable silicon to carry out LED light modulation is one of common LED light regulating technology, be illustrated in figure 1 silicon controlled light adjusting circuit, comprise: controllable silicon dimmer 100, rectification circuit 200, DC/DC change-over circuit 300, LED load 400 and AC power 600, Output Voltage in Rectified Circuits is V1, output current is I1, and the on state current electric current I 0 in circuit equals load current I1.Fig. 2 is the curve synoptic diagram of the on state current of above-mentioned silicon controlled light adjusting circuit.
Controllable silicon has one to maintain electric current, and in the time that on state current is less than silicon controlled electric current, controllable silicon just can turn-off and cause LED flicker.And in actual controllable silicon LED light adjusting system, because LED load and DC/DC change-over circuit are capacitive load, so controlled silicon conducting moment can produce impulse current, within t1～t1 ' time period, exist and impact and vibration as shown in Figure 3.And electric current in controllable silicon is relevant with the rate of change of on state current.
Therefore need now a kind of compensating circuit, not only can solve controllable silicon and turn-off problem in the mistake of zero crossing, also can solve controllable silicon mistake in the time of on state current existence impact and concussion and turn-off the problem of the LED lamp sudden strain of a muscle causing, and improve the service efficiency of compensating circuit.
Summary of the invention
The invention provides a kind of controllable silicon and maintain current compensation circuit, solve controllable silicon and turn-offed problem in the mistake of zero crossing, also solve the problem that the controllable silicon LED lamp that shutoff causes by mistake dodges in the time that on state current exists impact and concussion, solve the problem that in the whole cycle, controllable silicon mistake is turn-offed, and improved the service efficiency of compensating circuit.
For solving the problems of the technologies described above, a kind of controllable silicon provided by the invention maintains current compensation circuit, comprises AC power, controllable silicon dimmer, the rectification circuit being connected with capacitive load, also comprises:
Sampling differential circuit, for being triggered after conducting when described controllable silicon dimmer, when the existence of described capacitive load causes the improper shutoff of controllable silicon, the output voltage to described rectification circuit or output current are sampled and are carried out obtaining corresponding differential signal after differential;
The current compensation circuit being connected with described sampling differential circuit, for obtaining the load current of described differential signal and described capacitive load, described differential signal is input to current compensation circuit, described current compensation circuit produces offset current according to described differential signal and the electric current and the reference signal that flow through capacitive load, makes described offset current be greater than silicon controlled with the electric current sum that flows through capacitive load and maintains electric current.
Preferably, described sampling differential circuit comprises:
Voltage sample differential circuit, samples for the output voltage to described rectification circuit, and described output voltage is carried out to differential acquisition voltage derivative signal; Or,
Current sample differential circuit, samples for the output current to described rectification circuit, and described output current is carried out to differential acquisition current differential signal.
Preferably, described current compensation circuit comprises:
Comparison circuit, feedback circuit and load current sampling resistor, described comparison circuit comprises comparator;
The first input end of described comparator is connected with described sampling differential circuit through the 5th resistance, be used for receiving described differential signal, described first input end is connected with described load current sampling resistor through the 4th resistance, for receiving the load voltage after load current conversion, the second input of described comparator is connected with described reference signal, described differential signal is through the 5th resistance and the first input end at described comparison circuit through the described load current sampling resistor acting in conjunction of described the 4th resistance, the sampling end that described first input end is described comparison circuit; Described comparator is for by the comparing with value and described reference signal of described load voltage and described differential signal, and exports comparative result;
An input of described feedback circuit is connected with the output of described comparator, described feedback circuit output is connected with the first input end of described comparator with described the 4th resistance through described load current sampling resistor, the output head grounding of described feedback circuit, another input of described feedback circuit is connected with the input of capacitive load, described feedback circuit is used for receiving described comparative result, according to comparative result output offset current, and described offset current and described load current be converted to described load voltage with value, input to the first input end of described comparator.
Preferably, described current compensation circuit comprises:
Comparison circuit, feedback circuit and load current sampling resistor, described comparison circuit comprises comparator;
The first input end of described comparator is connected with described sampling differential circuit through the 6th resistance, be used for receiving described differential signal, described differential signal is the first input end at described comparator through the 6th resistance and described reference signal acting in conjunction, the reference edge that described first input end is described comparator; Described comparator the second input is connected with one end of described load current sampling resistor, for receiving the load voltage after described load current conversion, described comparator is for comparing with value and described load voltage described differential signal and reference signal, and export comparative result, the other end ground connection of described load current sampling resistor;
An input of described feedback circuit is connected with the output of described comparator, and described feedback circuit output is connected with the first input end of described comparator, and another input of described feedback circuit is connected with the input of capacitive load; Described feedback circuit is used for receiving described comparative result, according to comparative result output offset current, and by described offset current and described load current be converted to described load voltage with value, input to the second input of comparator.
Preferably, described voltage sample differential circuit comprises:
The first electric capacity being connected with described rectification circuit output end;
The first resistance being connected with described the first electric capacity, second electric capacity in parallel with described the first resistance, the other end ground connection of described the first resistance;
Described the first electric capacity is connected with described current compensation module with the points of common connection of described the first resistance.
Preferably, described current sample differential circuit comprises:
Be series at and described capacitive load between sampling resistor;
First electric capacity in parallel with described sampling resistor;
Described the first electric capacity is connected with described current compensation circuit with the points of common connection of described sampling resistor.
Preferably, also comprise:
NPN type triode and filter capacitor;
Described the first electric capacity is connected with the points of common connection of described the first resistance and the base stage of described triode;
The collector electrode of described triode is connected with positive source;
The emitter of described triode is connected to the ground by emitter resistance;
Described filter capacitor is in parallel with described emitter resistance.
Preferably, also comprise:
Diode, described diode is connected between rectification bridge output end and described the first electric capacity; The anodic bonding rectification bridge output end of described diode, negative electrode connects the first electric capacity; Or,
Described diode is connected between described sampling resistor and described the first electric capacity; Sampling resistor described in the anodic bonding of described diode, negative electrode connects the first electric capacity.
Preferably, described feedback circuit comprises N-type metal-oxide-semiconductor;
The grid of described N-type metal-oxide-semiconductor is connected with the output of described comparator;
The drain electrode of described N-type metal-oxide-semiconductor is connected with described capacitive load input;
When described comparator is when by the comparing with value and described reference signal of described load voltage and described differential signal, the source electrode of described N-type metal-oxide-semiconductor is connected with one end of described load current sampling resistor ground connection;
When described comparator is when by the comparing with value and described load voltage of described differential signal and described reference signal, the source electrode of described N-type metal-oxide-semiconductor is connected with one end that described load current sampling resistor connects described comparator the second input.
Preferably, described capacitive load comprises: LED driver, the filter capacitor in parallel with described LED driver input, the LED light source in parallel with described LED driver output.
Preferably, described current compensation circuit comprises an integrated circuit and load current sampling resistor;
Described integrated circuit comprises described comparison circuit and described feedback circuit.
The invention provides a kind of controllable silicon and maintain current compensation circuit, rate of change by the known on state current of background technology is relevant with the size that maintains electric current, in addition on state current is loop current, the amplitude variation tendency of loop current and voltage after rectifier bridge is consistent, thus after the rate of change of on state current and rectifier bridge the rate of change of voltage all with to maintain electric current proportional.The present invention obtains corresponding differential signal by also differential that the voltage of on state current or rectification circuit output is sampled.
In the time that the rate of change of the rate of change of on state current or the output voltage of rectification circuit is larger, it is also larger to be that differential signal maintains electric current when larger, now just produce a larger offset current according to differential signal, when the rate of change of the rate of change of on state current or the output voltage of rectification circuit hour, it is also less to be that differential signal hour maintains electric current, compensate at this moment a less offset current, to make in a word load current and offset current sum be greater than and maintain electric current, thereby avoid controllable silicon to turn-off.
The situation that maintains curent change that impulse when the present invention has considered controlled silicon conducting with respect to prior art and concussion cause, and according to impulse and the dynamically size of adjustment offset current of concussion, an instead of larger offset current of compensation, so this circuit solves the problem that LED lamp dodges in the time that on state current exists impact and concussion, and improve the service efficiency of compensating circuit.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is existing controllable silicon light modulation circuit structure diagram;
Fig. 2 is the curve synoptic diagram of the disclosed on state current of the embodiment of the present invention;
Fig. 3 is the curve synoptic diagram that the embodiment of the present invention disclosed maintains electric current;
Fig. 4 is the structural representation that the disclosed a kind of controllable silicon of the embodiment of the present invention maintains current compensation circuit;
Fig. 5 is the structural representation that disclosed another controllable silicon of the embodiment of the present invention maintains current compensation circuit;
Fig. 6 is the structural representation that disclosed another controllable silicon of the embodiment of the present invention maintains current compensation circuit;
Fig. 7 is the structural representation that the disclosed a kind of controllable silicon of the embodiment of the present invention maintains current compensation circuit;
Fig. 8 is the curve synoptic diagram of the disclosed differential signal obtaining after over-sampling differential circuit is processed of the embodiment of the present invention;
Fig. 9 is the structural representation that disclosed another controllable silicon of the embodiment of the present invention maintains current compensation circuit;
Figure 10 is the structural representation that the disclosed a kind of controllable silicon of the embodiment of the present invention maintains current compensation circuit;
Figure 11 is the structural representation that disclosed another controllable silicon of the embodiment of the present invention maintains current compensation circuit;
Figure 12 is the structural representation that disclosed another controllable silicon of the embodiment of the present invention maintains current compensation circuit.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 4, the invention provides a kind of controllable silicon and maintain current compensation circuit, this controllable silicon maintains current compensation circuit and is connected with capacitive load, except comprising AC power 600, controllable silicon dimmer 100 and rectification circuit 200, also comprise sampling differential circuit 700 and current compensation circuit 800, described capacitive load comprises DC/DC change-over circuit and/or LED load, for the clear capacitive load that represents, in specification, represent with label 340.In Fig. 8, show that I0 is on state current, V1 is the output voltage of rectification circuit 200, and the output current of rectification circuit 200 is I1, and load current is I1.
Sampling differential circuit 700, for the output signal of described rectification circuit 200 being sampled and differential processing, obtains corresponding differential signal;
Wherein, it should be noted that, in the time that this output signal is current signal, this sampling differential circuit 700 carries out differential processing after need sampling to this output current, and the geometric meaning that current signal is carried out to differential is the rate of change that obtains on state current.
The current compensation circuit 800 being connected with the output of described rectification circuit 200 with described sampling differential circuit 700, for obtaining the load current of described differential signal and described capacitive load 340, and produce offset current according to described differential signal and described load current, make described offset current and described load current sum be greater than silicon controlled and maintain electric current.
Experiment is found, maintains the size of electric current relevant with the rate of change of on state current, and general, rate of change is larger, maintains electric current larger.In addition the rate of change trend of on state current and voltage after rectifier bridge is consistent, so after the rate of change of on state current and rectifier bridge the rate of change of voltage all with maintain electric current positive correlation, before not carrying out current compensation, output current=the load current of on state current=rectification circuit, so the present invention is the on state current before not compensating using the output current of rectification circuit and load current, the output voltage of the rectification circuit using the output voltage of rectification circuit before not compensating.
Main thought of the present invention is when the output current rate of change of rectification circuit 200 or output voltage rate of change are when larger, maintain electric current and produce a larger offset current when larger, when the rate of change of the rate of change of load current or the output voltage of rectification circuit hour, maintain hour less offset current of generation of electric current, dynamically adjust the size of offset current according to the rate of change of the rate of change of output current or the output voltage of rectification circuit, load current and offset current sum are greater than and maintain electric current, thereby avoid controllable silicon to turn-off.
In the specific implementation, by sampling differential circuit 700 to rectification circuit output current or the output voltage differential of sampling, the geometric meaning that current signal after sampling is carried out to differential is and obtains change rate signal, and what obtain can be used as the rate of change of output current through differential current differential signal after treatment.
Differential signal is sent to current compensation circuit 800, and current compensation circuit produces an offset current being directly proportional to differential signal according to differential signal, and more large compensation electric current is larger for differential signal, dynamically adjusts thus the size of offset current.
The situation that maintains curent change that impulse when the present invention has considered controlled silicon conducting with respect to prior art and concussion cause, and compensate electric current according to impulse and the dynamic size of adjusting offset current of concussion, instead of very large offset current of fixed compensation.The present invention will make load current and offset current sum be greater than and maintain electric current, thereby avoids controllable silicon to turn-off, and the offset current providing is according to impulse and concussion real-time change.So this circuit has not only solved the problem that LED lamp dodges in the time that on state current exists impact and concussion, and improve the service efficiency of compensating circuit.
Owing to both can using the rate of change of the output voltage of rectification circuit in the present invention, can use again the rate of change of output current, so the differential circuit 700 of sampling described in the present invention comprises: voltage sample differential circuit 701 or current sample differential circuit 702;
Wherein voltage sample differential circuit 701, for the output voltage of described rectification circuit 200 is sampled, and carries out differential acquisition voltage derivative signal to described output voltage; Current sample differential circuit 702, for the output current of described rectification circuit 200 is sampled, and carries out after differential is processed obtaining current differential signal to described output current.
Introduce described current compensation circuit 800 below, as shown in Figure 5, comprising:
Comparison circuit, feedback circuit 802 and load current sampling resistor R3; Wherein, described comparison circuit comprises comparator 801.
Described differential signal acts on sampling end, the first input end that is described comparator 801 is connected with described sampling differential circuit 700 through the 5th resistance R 5, be used for receiving described differential signal, described first input end is connected with described load current sampling resistor R3 through the 4th resistance R 4, for receiving the load voltage after load current conversion, the second input of described comparator 801 is connected with reference signal, described differential signal is through the 5th resistance R 5 and the first input end at described comparator through the described load current sampling resistor R3 of described the 4th resistance R 4 acting in conjunction, described first input end is the sampling end of described comparator, described comparator 801 is for by the comparing with value and baseline signal value of described load voltage and described differential signal, and exports comparative result,
An input of described feedback circuit 802 is connected with the output of described comparator 801, the output of described feedback circuit 802 is connected with the first input end of described comparator 801 with described the second resistance R 4 through described load current sampling resistor R3, the output head grounding of described feedback circuit 802.Described feedback circuit 802 is according to the described comparative result output offset current receiving, and by described offset current and described load current be converted to described load voltage with value, input to the first input end of described comparator 801.
Equally, described differential signal also can act on reference edge, makes the reference signal+differential signal of new reference signal=setting, then haggles over load current differential signal.In the time that load current differential signal is less than new reference signal, more compensate.Specifically as shown in Figure 6:
This current compensation circuit 800 comprises: comparison circuit, feedback circuit 802 and load current sampling resistor R3, and described comparison circuit comprises comparator 801;
The first input end of described comparator 801 is connected with described sampling differentiation element through the 6th resistance R 6, be used for receiving described differential signal, described differential signal acts on reference edge, be described differential signal through the 6th resistance R 6 and the first input end of described reference signal acting in conjunction at described comparator 801, described first input end is the reference edge of described comparator 801; Described comparator 801 second inputs are connected with one end of described load current sampling resistor R3, for receiving the load voltage after described load current conversion, described comparator 801 is for comparing with value and described load voltage described differential signal and described reference signal, and export comparative result, the other end ground connection of described load current sampling resistor R3;
An input of described feedback circuit 802 is connected with the output of comparison circuit, be connected with the output of described comparator 801, described feedback circuit 802 outputs are connected with the first input end of described comparator 801, and another input of described feedback circuit 802 is connected with the input of capacitive load.Described feedback circuit 802 is for receiving described comparative result, according to comparative result output offset current, and by described offset current and described load current be converted to described load voltage with value, input to the first input end of comparator 801.
To sum up, in order to realize the function of comparison, need to use comparison circuit.Utilize load current sampling resistor that load current is converted to load voltage, by sampled voltage and load voltage with value comparing unit an input.In order to realize voltage ratio function, another input of comparing unit is connected with reference signal, using reference signal as with reference to voltage.
Feedback circuit comprises metal-oxide-semiconductor, when load voltage and differential voltage be less than reference voltage with value time, a voltage of comparison circuit output, this voltage can make metal-oxide-semiconductor be operated in linear zone, according to difference dynamic adjustments mos linear resistance described and value and reference voltage, change offset current, load current is compensated, sue for peace by load current and offset current, obtain the load current after compensation.
Then feedback circuit 802 inputs to the first input end of comparator 801 by the load current after compensation and differential voltage now again with value, contrast with reference voltage, if the input voltage of first input end is still less than reference voltage, continue load current to compensate, if the input voltage of first input end is greater than reference voltage, stop load current compensating.
The present invention also will solve the flicker problem of zero crossing, so the present invention also comprises:
The current compensation circuit being connected with described capacitive load 340, be used for receiving described load current, described load current be less than controllable silicon dimmer maintain electric current time, described load current is compensated, and what make described load current and described offset current is greater than the electric current that maintains of controllable silicon dimmer with value.
Current compensation circuit, act as the part of t2～T as shown in Figure 3, load current is compensated, for avoiding controllable silicon to turn-off.
The concrete circuit structure diagram of lower mask body introduction, as shown in Figure 7, described voltage sample differential circuit 701 comprises:
The first capacitor C 1 being connected with described rectification circuit 200 outputs;
With the first resistance R 1 that described the first capacitor C 1 is connected, the other end ground connection of described the first resistance R 1;
Second capacitor C 2 in parallel with described the first resistance R 1;
Described the first capacitor C 1 is connected with described current compensation circuit 800 with the points of common connection of described the first resistance R 1.Referring to Fig. 8: in the time that after rectifier bridge, output voltage exists overshoot, output current I0 also there will be overshoot, through the processing of over-sampling differential circuit, can obtain differential signal shown in Fig. 8.
As shown in Figure 9, described current sample differential circuit 702 comprises:
One end is connected with described capacitive load 340, the sampling resistor Rs of other end ground connection;
The first capacitor C 1 that the one end that connects described capacitive load 304 with described sampling resistor Rs is connected, described the first capacitor C 1 other end ground connection; Be that described sampling resistor Rs is in parallel with described the first capacitor C 1;
Described the first capacitor C 1 is connected with described current compensation circuit 800 with the points of common connection of described sampling resistor Rs.
Preferably, as shown in Figure 10 or Figure 11, voltage sample differential circuit 701 and current sample differential circuit 702 also comprise:
NPN type triode Q and filter capacitor C3;
Described the first capacitor C 1 is connected with the base stage of described triode Q with the points of common connection of described the first resistance R 1;
The collector electrode of described triode is connected with positive source VCC;
The emitter of described triode is connected to the ground by emitter resistance R2;
Described filter capacitor C3 is in parallel with described emitter resistance R2.
Preferably, shown in Figure 10, the diode (not marking in figure) of can also connecting between rectification circuit 200 outputs and the first capacitor C 1, the output of rectification circuit 200 described in the anodic bonding of this diode, negative electrode connects described the first capacitor C 1.
Described in Figure 11, diode (not marking in figure) is connected between Rs and C1, the anodic bonding Rs of this diode, and negative electrode connects C1.
Preferably, as shown in figure 12, described current compensation circuit 800 comprises:
Comparison circuit, feedback circuit and load current sampling resistor R3, described comparison circuit comprises comparator M, the 4th resistance R 4 and the 5th resistance R 5, described feedback circuit comprises N-type metal-oxide-semiconductor;
The in-phase input end "+" of described comparator M is connected with load current sampling resistor R3 through the 4th resistance R 4, in-phase input end "+" is connected with sampling differential circuit 700 through the 5th resistance R 5, inverting input "-" reference signal Vref is connected, and the output of described comparator M is connected with the grid G of described N-type metal-oxide-semiconductor;
The drain D of described N-type metal-oxide-semiconductor is connected with the output of described rectification circuit 200, the source S of described N-type metal-oxide-semiconductor is connected with one end of described load current sampling resistor R3 ground connection, described load current sampling resistor R3 one end ground connection, one end is connected with described the 4th resistance R 4.
In summary, the invention provides a kind of controllable silicon and maintain current compensation circuit, the rate of change of on state current determines to maintain the size of electric current to a certain extent, in addition the amplitude variation tendency of the output voltage of on state current and rectification circuit is consistent, thus the rate of change of the rate of change of on state current and the output voltage of rectification circuit all with maintain electric current and become positive correlation.The present invention is by sampling to the output voltage of on state current or rectification circuit and differential obtains differential signal, and the geometric meaning that signal is carried out to differential is the rate of change of the rate of change of on state current or the output voltage of rectification circuit.
In the time that the rate of change of the rate of change of on state current or the output voltage of rectification circuit is larger, it is also larger to be that differential signal maintains electric current when larger, now just produce a larger offset current according to differential signal, when the rate of change of the rate of change of on state current or the output voltage of rectification circuit hour, it is also less to be that differential signal hour maintains electric current, compensate at this moment a less offset current, to make in a word load current and offset current sum be greater than and maintain electric current, thereby avoid controllable silicon to turn-off.
The situation that maintains curent change that impulse when the present invention has considered controlled silicon conducting with respect to prior art and concussion cause, and according to impulse and the dynamically size of adjustment offset current of concussion, an instead of larger offset current of compensation, so this circuit solves the problem that LED lamp dodges in the time that on state current exists impact and concussion, and improve the service efficiency of compensating circuit.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment same or similar part mutually referring to.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (11)
1. controllable silicon maintains a current compensation circuit, comprises AC power, controllable silicon dimmer, the rectification circuit being connected with capacitive load, it is characterized in that, also comprises:
Sampling differential circuit, for being triggered after conducting when described controllable silicon dimmer, when the existence of described capacitive load causes the improper shutoff of controllable silicon, the output voltage to described rectification circuit or output current are sampled and are carried out obtaining corresponding differential signal after differential;
The current compensation circuit being connected with described sampling differential circuit, for obtaining the load current of described differential signal and described capacitive load, described differential signal is input to current compensation circuit, described current compensation circuit produces offset current according to described differential signal and the electric current and the reference signal that flow through capacitive load, makes described offset current be greater than silicon controlled with the electric current sum that flows through capacitive load and maintains electric current.
2. circuit as claimed in claim 1, is characterized in that, described sampling differential circuit comprises:
Voltage sample differential circuit, samples for the output voltage to described rectification circuit, and described output voltage is carried out to differential acquisition voltage derivative signal; Or,
Current sample differential circuit, samples for the output current to described rectification circuit, and described output current is carried out to differential acquisition current differential signal.
3. circuit as claimed in claim 1, is characterized in that, described current compensation circuit comprises:
Comparison circuit, feedback circuit and load current sampling resistor, described comparison circuit comprises comparator;
The first input end of described comparator is connected with described sampling differential circuit through the 5th resistance, be used for receiving described differential signal, described first input end is connected with described load current sampling resistor through the 4th resistance, for receiving the load voltage after load current conversion, the second input of described comparator is connected with described reference signal, described differential signal is through the 5th resistance and the first input end at described comparison circuit through the described load current sampling resistor acting in conjunction of described the 4th resistance, the sampling end that described first input end is described comparison circuit; Described comparator is for by the comparing with value and described reference signal of described load voltage and described differential signal, and exports comparative result;
An input of described feedback circuit is connected with the output of described comparator, described feedback circuit output is connected with the first input end of described comparator with described the 4th resistance through described load current sampling resistor, the output head grounding of described feedback circuit, another input of described feedback circuit is connected with the input of capacitive load, described feedback circuit is used for receiving described comparative result, according to comparative result output offset current, and described offset current and described load current be converted to described load voltage with value, input to the first input end of described comparator.
4. circuit as claimed in claim 1, is characterized in that, described current compensation circuit comprises:
Comparison circuit, feedback circuit and load current sampling resistor, described comparison circuit comprises comparator;
The first input end of described comparator is connected with described sampling differential circuit through the 6th resistance, be used for receiving described differential signal, described differential signal is the first input end at described comparator through the 6th resistance and described reference signal acting in conjunction, the reference edge that described first input end is described comparator; Described comparator the second input is connected with one end of described load current sampling resistor, for receiving the load voltage after described load current conversion, described comparator is for comparing with value and described load voltage described differential signal and reference signal, and export comparative result, the other end ground connection of described load current sampling resistor;
An input of described feedback circuit is connected with the output of described comparator, and described feedback circuit output is connected with the first input end of described comparator, and another input of described feedback circuit is connected with the input of capacitive load; Described feedback circuit is used for receiving described comparative result, according to comparative result output offset current, and by described offset current and described load current be converted to described load voltage with value, input to the second input of comparator.
5. circuit as claimed in claim 2, is characterized in that, described voltage sample differential circuit comprises:
The first electric capacity being connected with described rectification circuit output end;
The first resistance being connected with described the first electric capacity, second electric capacity in parallel with described the first resistance, the other end ground connection of described the first resistance;
Described the first electric capacity is connected with described current compensation module with the points of common connection of described the first resistance.
6. circuit as claimed in claim 2, is characterized in that, described current sample differential circuit comprises:
Be series at and described capacitive load between sampling resistor;
First electric capacity in parallel with described sampling resistor;
Described the first electric capacity is connected with described current compensation circuit with the points of common connection of described sampling resistor.
7. the circuit as described in claim 5 or 6, is characterized in that, also comprises:
NPN type triode and filter capacitor;
Described the first electric capacity is connected with the points of common connection of described the first resistance and the base stage of described triode;
The collector electrode of described triode is connected with positive source;
The emitter of described triode is connected to the ground by emitter resistance;
Described filter capacitor is in parallel with described emitter resistance.
8. according to the circuit described in claim 5 or 6, it is characterized in that, also comprise:
Diode, described diode is connected between rectification bridge output end and described the first electric capacity; The anodic bonding rectification bridge output end of described diode, negative electrode connects the first electric capacity; Or,
Described diode is connected between described sampling resistor and described the first electric capacity; Sampling resistor described in the anodic bonding of described diode, negative electrode connects the first electric capacity.
9. the circuit as described in claim 3 or 4, is characterized in that, described feedback circuit comprises N-type metal-oxide-semiconductor;
The grid of described N-type metal-oxide-semiconductor is connected with the output of described comparator;
The drain electrode of described N-type metal-oxide-semiconductor is connected with described capacitive load input;
When described comparator is when by the comparing with value and described reference signal of described load voltage and described differential signal, the source electrode of described N-type metal-oxide-semiconductor is connected with one end of described load current sampling resistor ground connection;
When described comparator is when by the comparing with value and described load voltage of described differential signal and described reference signal, the source electrode of described N-type metal-oxide-semiconductor is connected with one end that described load current sampling resistor connects described comparator the second input.
10. circuit as claimed in claim 1, is characterized in that, described capacitive load comprises: LED driver, the filter capacitor in parallel with described LED driver input, the LED light source in parallel with described LED driver output.
11. according to the circuit described in claim 3 or 4, it is characterized in that, described current compensation circuit comprises an integrated circuit and load current sampling resistor;
Described integrated circuit comprises described comparison circuit and described feedback circuit.
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| CN201410481813.7A CN104202886B (en) | 2014-09-19 | 2014-09-19 | A kind of controllable silicon maintains current compensation circuit |
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