CN104202886B - A kind of controllable silicon maintains current compensation circuit - Google Patents
A kind of controllable silicon maintains current compensation circuit Download PDFInfo
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- CN104202886B CN104202886B CN201410481813.7A CN201410481813A CN104202886B CN 104202886 B CN104202886 B CN 104202886B CN 201410481813 A CN201410481813 A CN 201410481813A CN 104202886 B CN104202886 B CN 104202886B
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Abstract
The invention provides a kind of controllable silicon and maintain current compensation circuit, the present invention by the output voltage of on state current or rectification circuit is sampled and differential process obtain differential signal, when the rate of change of the rate of change of on state current or the output voltage of rectification circuit is bigger, a corresponding big compensation electric current is produced 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 is less, compensate a corresponding little compensation electric current at this moment, make load current and compensate electric current sum more than maintaining electric current, thus avoiding the improper shutoff of controllable silicon.The situation maintaining curent change that impulse when the present invention considers controlled silicon conducting and concussion cause, and dynamically adjust, according to impulse and concussion, the size compensating electric current, so this circuit solves the problem that LED is dodged when on state current exists and impacts and shake, and improve the service efficiency compensating circuit.
Description
Technical field
The present invention relates to circuit engineering field, particularly relate 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, it is illustrated in figure 1 silicon controlled light adjusting circuit, including: controllable silicon dimmer 100, rectification circuit 200, DC/DC change-over circuit 300, LED load 400 and alternating current power supply 600, Output Voltage in Rectified Circuits is V1, output electric current is I1, and the on state current electric current I0 in circuit is equal to 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 when on state current is less than silicon controlled electric current, controllable silicon will turn off and cause LED to glimmer.And in actual controllable silicon LED light adjusting system, owing to LED load and DC/DC change-over circuit are capacitive load, so controlled silicon conducting moment can produce dash current, as shown in Figure 3 in t1～existence impact and vibration in the t1 ' time period.And the electric current in controllable silicon is relevant with the rate of change of on state current.
Therefore need now one to compensate circuit, be possible not only to solution controllable silicon in the mistake of zero crossing and turn off problem, it is also possible to solve the controllable silicon when on state current exists and impacts and shake and turn off the problem that the LED caused is dodged by mistake, and improve the service efficiency compensating circuit.
Summary of the invention
The invention provides a kind of controllable silicon and maintain current compensation circuit, solve controllable silicon and turn off problem in the mistake of zero crossing, also solve the controllable silicon when on state current exists and impacts and shake and turn off the problem that the LED caused is dodged by mistake, namely solve the problem that in the whole cycle, controllable silicon turns off by mistake, and improve the service efficiency compensating circuit.
For solving above-mentioned technical problem, a kind of controllable silicon provided by the invention maintains current compensation circuit, including alternating current power supply, controllable silicon dimmer, the rectification circuit that is connected with capacitive load, also includes:
Sampling peaker, for after described controllable silicon dimmer is triggered conducting, when the existence of described capacitive load causes that controllable silicon is improper to be turned off, after the output voltage of described rectification circuit or output electric current are sampled and carried out differential, obtain corresponding differential signal；
The current compensation circuit being connected with described sampling peaker, for obtaining described differential signal and the load current of described capacitive load, described differential signal is input to current compensation circuit, described current compensation circuit produces to compensate electric current with the electric current and a reference signal flowing through capacitive load according to described differential signal so that described compensation electric current and the electric current sum flowing through capacitive load maintain electric current more than silicon controlled.
Preferably, described sampling peaker includes:
Voltage sample peaker, for the output voltage of described rectification circuit is sampled, and carries out differential acquisition voltage derivative signal to described output voltage；Or,
Current sample peaker, for the output electric current of described rectification circuit is sampled, and carries out differential acquisition current differential signal to described output electric current.
Preferably, described current compensation circuit includes:
Comparison circuit, feedback circuit and load current sampling resistor, described comparison circuit includes comparator；
The first input end of described comparator is connected with described sampling peaker through the 5th resistance, 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 is changed, second input of described comparator is connected with described reference signal, described differential signal through the 5th resistance with the described load current sampling resistor combined effect through described 4th resistance at the first input end of described comparison circuit, described first input end is the sampling end of described comparison circuit；Described comparator for by described load voltage and described differential signal and value and described reference signal compare, and export comparative result；
One input of described feedback circuit is connected with the outfan of described comparator, described feedback circuit output is connected with the first input end of described comparator with described 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, electric current is compensated according to comparative result output, and by described compensation electric current and described load current and value be converted to described load voltage, the first input end of input extremely described comparator.
Preferably, described current compensation circuit includes:
Comparison circuit, feedback circuit and load current sampling resistor, described comparison circuit includes comparator；
The first input end of described comparator is connected with described sampling peaker through the 6th resistance, for receiving described differential signal, described differential signal is through first input end at described comparator of the 6th resistance and described reference signal combined effect, and described first input end is the reference edge of 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 is changed, described comparator for by described differential signal and reference signal and value and described load voltage compare, and export comparative result, the other end ground connection of described load current sampling resistor；
One input of described feedback circuit is connected with the outfan 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, compensates electric current according to comparative result output, and by described compensation electric current and described load current and value be converted to described load voltage, input is to the second input of comparator.
Preferably, described voltage sample peaker includes:
The first electric capacity being connected with described rectification circuit output end；
The first resistance being connected with described first electric capacity, with the second electric capacity of described first resistor coupled in parallel, the other end ground connection of described first resistance；
Described first electric capacity is connected with described current compensation module with the points of common connection of described first resistance.
Preferably, described current sample peaker includes:
Be series at and described capacitive load between sampling resistor；
First electric capacity in parallel with described sampling resistor；
Described first electric capacity is connected with described current compensation circuit with the points of common connection of described sampling resistor.
Preferably, also include:
NPN type triode and filter capacitor；
Described first electric capacity is connected with the base stage of described audion with the points of common connection of described first resistance；
The colelctor electrode of described audion is connected with positive source；
The emitter stage of described audion is connected to the ground by emitter resistance；
Described filter capacitor is in parallel with described emitter resistance.
Preferably, also include:
Diode, described Diode series is between rectification bridge output end and described first electric capacity；The anode of described diode connects rectification bridge output end, and negative electrode connects the first electric capacity；Or,
Described Diode series is between described sampling resistor and described first electric capacity；The anode of described diode connects described sampling resistor, and negative electrode connects the first electric capacity.
Preferably, described feedback circuit includes N-type metal-oxide-semiconductor；
The grid of described N-type metal-oxide-semiconductor is connected with the outfan of described comparator；
The drain electrode of described N-type metal-oxide-semiconductor is connected with described capacitive load input；
When described comparator is for by described load voltage and when comparing with described reference signal with value of 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 for by described differential signal and described reference signal and when value and described load voltage compare, the source electrode of described N-type metal-oxide-semiconductor connects one end of described comparator the second input and is connected with described load current sampling resistor.
Preferably, described capacitive load includes: LED driver, the filter capacitor in parallel with described LED driver input, the LED light source in parallel with described LED driver outfan.
Preferably, described current compensation circuit includes an integrated circuit and load current sampling resistor；
Described integrated circuit includes described comparison circuit and described feedback circuit.
The invention provides a kind of controllable silicon and maintain current compensation circuit, relevant with the size maintaining electric current by the rate of change of the known on state current of background technology, in addition on state current and loop current, loop current is consistent with the amplitude variation tendency of voltage after rectifier bridge, so the rate of change of voltage is all with to maintain electric current proportional after the rate of change of on state current and rectifier bridge.The present invention is sampled by the voltage that on state current or rectification circuit are exported and differential obtains corresponding differential signal.
When the rate of change of the rate of change of on state current or the output voltage of rectification circuit is bigger, namely when differential signal is bigger, maintenance electric current is also bigger, now just produce a bigger compensation electric 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 is less, namely when differential signal is less, maintenance electric current is also less, compensate a less compensation electric current at this moment, to make load current in a word and compensate electric current sum more than maintaining electric current, thus avoiding controllable silicon to turn off.
The present invention considers impulse during controlled silicon conducting relative to prior art and shakes the situation maintaining curent change caused, and dynamically adjust, according to impulse and concussion, the size compensating electric current, rather than compensate a bigger compensation electric current, so this circuit solves the problem that LED is dodged when on state current exists and impacts and shake, and improve the service efficiency compensating circuit.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will 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, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is existing controllable silicon light modulation circuit structure diagram；
Fig. 2 is the curve synoptic diagram of an on state current disclosed in the embodiment of the present invention；
Fig. 3 is the curve synoptic diagram of a maintenance electric current disclosed in the embodiment of the present invention；
Fig. 4 is the structural representation that a kind of controllable silicon disclosed in the embodiment of the present invention maintains current compensation circuit；
Fig. 5 is the structural representation that the embodiment of the present invention another controllable silicon disclosed maintains current compensation circuit；
Fig. 6 is the structural representation that the embodiment of the present invention another controllable silicon disclosed maintains current compensation circuit；
Fig. 7 is the structural representation that a kind of controllable silicon disclosed in the embodiment of the present invention maintains current compensation circuit；
Fig. 8 is the curve synoptic diagram of the disclosed differential signal obtained after over-sampling peaker processes of the embodiment of the present invention；
Fig. 9 is the structural representation that the embodiment of the present invention another controllable silicon disclosed maintains current compensation circuit；
Figure 10 is the structural representation that a kind of controllable silicon disclosed in the embodiment of the present invention maintains current compensation circuit；
Figure 11 is the structural representation that the embodiment of the present invention another controllable silicon disclosed maintains current compensation circuit；
Figure 12 is the structural representation that the embodiment of the present invention another controllable silicon disclosed maintains current compensation circuit.
Detailed description of the invention
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, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into 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, sampling peaker 700 and current compensation circuit 800 is also included except including alternating current power supply 600, controllable silicon dimmer 100 and rectification circuit 200, described capacitive load includes DC/DC change-over circuit and/or LED load, in order to clearly show that capacitive load, description is indicated with label 340.Showing in Fig. 8 that I0 is on state current, V1 is the output voltage of rectification circuit 200, and the output electric current of rectification circuit 200 is I1, and load current is I1.
Sampling peaker 700, for carrying out sampling differential process, it is thus achieved that corresponding differential signal to the output signal of described rectification circuit 200；
Wherein it is desired to illustrate, when this output signal is current signal, this sampling peaker 700 need to carry out differential process after this output electric current is sampled, and the geometric meaning that current signal carries out differential is the rate of change obtaining on state current.
The current compensation circuit 800 being connected with the outfan of described sampling peaker 700 and described rectification circuit 200, for obtaining described differential signal and the load current of described capacitive load 340, and produce to compensate electric current according to described differential signal and described load current, make described compensation electric current and described load current sum maintain electric current more than silicon controlled.
Experiment finds, the size maintaining electric current is relevant with the rate of change of on state current, and generally, rate of change is more big, maintains electric current more big.In addition on state current is consistent with the rate of change trend of voltage after rectifier bridge, 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 electric current=the load current of on state current=rectification circuit, so the present invention using the output electric current of rectification circuit and load current as the on state current before not compensating, using the output voltage of the rectification circuit output voltage as the rectification circuit before not compensating.
The main thought of the present invention is when the output current changing rate of rectification circuit 200 or output voltage rate of change are bigger, namely maintenance electric current produces a bigger compensation electric current time bigger, when the rate of change of the rate of change of load current or the output voltage of rectification circuit is less, namely maintenance electric current produces a less compensation electric current time less, the size compensating electric current is dynamically adjusted according to the rate of change of the output voltage of the rate of change or rectification circuit that export electric current, make load current and compensate electric current sum more than maintaining electric current, thus avoiding controllable silicon to turn off.
In the specific implementation, by sampling, rectification circuit output electric current or output voltage are carried out sampling differential by peaker 700, the geometric meaning that current signal after sampling carries out differential is acquisition change rate signal, and the current differential signal after differential processes obtained can as the rate of change of output electric current.
Sending differential signal to current compensation circuit 800, current compensation circuit produces a compensation electric current being directly proportional to differential signal according to differential signal, and namely differential signal more large compensation electric current is more big, thus dynamically adjusts the size compensating electric current.
The present invention considers impulse during controlled silicon conducting relative to prior art and shakes the situation maintaining curent change caused, and compensates electric current rather than the compensation electric current that fixed compensation one is very big according to the dynamic size compensating electric current that adjusts of impulse and concussion.The present invention to make load current and compensate electric current sum more than maintaining electric current, thus avoiding controllable silicon to turn off, and the compensation electric current provided is according to impulse and concussion real-time change.So this circuit not only solves the problem that LED is dodged when on state current exists and impacts and shake, and improve the service efficiency compensating circuit.
Owing to the present invention both can use the rate of change of the output voltage of rectification circuit, the rate of change of output electric current can be used again, so heretofore described sampling peaker 700 includes: voltage sample peaker 701 or current sample peaker 702；
Wherein voltage sample peaker 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 peaker 702, for the output electric current of described rectification circuit 200 is sampled, and obtains current differential signal after described output electric current carries out differential process.
Described current compensation circuit 800 is described below, as it is shown in figure 5, include:
Comparison circuit, feedback circuit 802 and load current sampling resistor R3；Wherein, described comparison circuit includes comparator 801.
Described differential signal acts on sampling end, namely the first input end of described comparator 801 is connected with described sampling peaker 700 through the 5th resistance R5, for receiving described differential signal, described first input end is connected with described load current sampling resistor R3 through the 4th resistance R4, for receiving the load voltage after load current is changed, second input of described comparator 801 is connected with reference signal, described differential signal through the 5th resistance R5 with the described load current sampling resistor R3 combined effect through described 4th resistance R4 at the first input end of described comparator, described first input end is the sampling end of described comparator；Described comparator 801 for by described load voltage and described differential signal and value and baseline signal value compare, and export comparative result；
One input of described feedback circuit 802 is connected with the outfan of described comparator 801, the outfan of described feedback circuit 802 is connected with the first input end of described comparator 801 with described second resistance R4 through described load current sampling resistor R3, the output head grounding of described feedback circuit 802.Described feedback circuit 802 compensates electric current according to the described comparative result output received, and by described compensation electric current and described load current and value be converted to described load voltage, the first input end of input extremely described comparator 801.
Equally, described differential signal can also act on reference edge so that the reference signal+differential signal of new reference signal=setting, then haggles over load current differential signal.When load current differential signal is less than new reference signal, then more compensate.Specifically as shown in Figure 6:
This current compensation circuit 800 includes: comparison circuit, feedback circuit 802 and load current sampling resistor R3, described comparison circuit includes comparator 801；
The first input end of described comparator 801 is connected with described sampling differentiation element through the 6th resistance R6, for receiving described differential signal, described differential signal acts on reference edge, namely described differential signal is through first input end at described comparator 801 of the 6th resistance R6 and described reference signal combined effect, and described first input end is the reference edge of described comparator 801；Described comparator 801 second input is connected with one end of described load current sampling resistor R3, for receiving the load voltage after described load current is changed, described comparator 801 for by described differential signal and described reference signal and value and described load voltage compare, and export comparative result, the other end ground connection of described load current sampling resistor R3；
One input of described feedback circuit 802 is connected with the outfan of comparison circuit, namely it is connected with the outfan of described comparator 801, described feedback circuit 802 outfan is 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 used for receiving described comparative result, compensates electric current according to comparative result output, and by described compensation electric current and described load current and value be converted to described load voltage, input is to the first input end of comparator 801.
To sum up, in order to realize the function compared, it is necessary to use comparison circuit.Utilize load current sampling resistor that load current is converted to load voltage, by an input with value comparing unit of sampled voltage and load voltage.In order to realize voltage ratio compared with function another input of comparing unit is connected with reference signal, by reference signal as the reference voltage.
Feedback circuit includes metal-oxide-semiconductor, when load voltage and differential voltage and value less than reference voltage time, comparison circuit one voltage of output, this voltage can make metal-oxide-semiconductor be operated in linear zone, difference according to described and value and reference voltage dynamically regulates mos linear resistance, changes and compensates electric current, load current is compensated, sue for peace with compensating electric current by load current, it is thus achieved that the load current after compensation.
Then feedback circuit 802 by the load current after compensating and now differential voltage and value again input the first input end to comparator 801, contrast with reference voltage, if the input voltage of first input end is also less than reference voltage, continue load current is compensated, if the input voltage of first input end is more than reference voltage, stop load current being compensated.
The present invention also to solve the flicker problem of zero crossing, so present invention additionally comprises:
The current compensation circuit being connected with described capacitive load 340, for receiving described load current, when described load current is less than the maintenance electric current of controllable silicon dimmer, described load current is compensated, make described load current and described compensation electric current and value more than the maintenance electric current of controllable silicon dimmer.
Current compensation circuit, act as the part of t2～T as shown in Figure 3, load current is compensated, is used for avoiding controllable silicon to turn off.
Introduce concrete circuit structure diagram in detail below, as it is shown in fig. 7, described voltage sample peaker 701 includes:
The the first electric capacity C1 being connected with described rectification circuit 200 outfan；
With described first electric capacity C1 the first resistance R1 being connected, the other end ground connection of described first resistance R1；
With described first second electric capacity C2 in parallel for resistance R1；
The points of common connection of described first electric capacity C1 and described first resistance R1 is connected with described current compensation circuit 800.Referring to Fig. 8: when after rectifier bridge, output voltage exists overshoot, output electric current I0 also there will be overshoot, processes through over-sampling peaker, it is possible to obtain differential signal shown in Fig. 8.
As it is shown in figure 9, described current sample peaker 702 includes:
One end is connected with described capacitive load 340, the sampling resistor Rs of other end ground connection；
The first electric capacity C1 that one end of described capacitive load 304 is connected, described first electric capacity C1 other end ground connection is connect with described sampling resistor Rs；Namely described sampling resistor Rs is in parallel with described first electric capacity C1；
Described first electric capacity C1 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 peaker 701 and current sample peaker 702 also include:
NPN type triode Q and filter capacitor C3；
Described first electric capacity C1 is connected with the base stage of described audion Q with the points of common connection of described first resistance R1；
The colelctor electrode of described audion is connected with positive source VCC；
The emitter stage of described audion 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, can also connecting between rectification circuit 200 outfan and the first electric capacity C1 a diode (not marking in figure), the anode of this diode connects the outfan of described rectification circuit 200, and negative electrode connects described first electric capacity C1.
Described in Figure 11, diode (does not mark in figure) and is connected between Rs and C1, and the anode of this diode connects Rs, and negative electrode connects C1.
Preferably, as shown in figure 12, described current compensation circuit 800 includes:
Comparison circuit, feedback circuit and load current sampling resistor R3, described comparison circuit includes comparator M, and the 4th resistance R4 and the five resistance R5, described feedback circuit includes N-type metal-oxide-semiconductor；
The in-phase input end of described comparator M "+" be connected with load current sampling resistor R3 through the 4th resistance R4, in-phase input end "+" be connected with sampling peaker 700 through the 5th resistance R5, inverting input "-" reference signal Vref is connected, and the outfan 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 outfan 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 4th resistance R4.
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 on state current is consistent with the amplitude variation tendency of the output voltage of rectification circuit, so the rate of change of on state current all becomes positive correlation with maintenance electric current with the rate of change of the output voltage of rectification circuit.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 carries out differential is the rate of change of on state current or the rate of change of the output voltage of rectification circuit.
When the rate of change of the rate of change of on state current or the output voltage of rectification circuit is bigger, namely when differential signal is bigger, maintenance electric current is also bigger, now just produce a bigger compensation electric 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 is less, namely when differential signal is less, maintenance electric current is also less, compensate a less compensation electric current at this moment, to make load current in a word and compensate electric current sum more than maintaining electric current, thus avoiding controllable silicon to turn off.
The present invention considers impulse during controlled silicon conducting relative to prior art and shakes the situation maintaining curent change caused, and dynamically adjust, according to impulse and concussion, the size compensating electric current, rather than compensate a bigger compensation electric current, so this circuit solves the problem that LED is dodged when on state current exists and impacts and shake, and improve the service efficiency compensating circuit.
In this specification, each embodiment adopts the mode gone forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment same or similar part mutually referring to.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.The multiple amendment of these embodiments be will be apparent from for those skilled in the art, and generic principles defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (11)
1. controllable silicon maintains a current compensation circuit, including alternating current power supply, controllable silicon dimmer, the rectification circuit that is connected with capacitive load, it is characterised in that also include:
Sampling peaker, for after described controllable silicon dimmer is triggered conducting, when the existence of described capacitive load causes that controllable silicon is improper to be turned off, after the output voltage of described rectification circuit or output electric current are sampled and carried out differential, obtain corresponding differential signal；
The current compensation circuit being connected with described sampling peaker, for obtaining described differential signal and the load current of described capacitive load, described differential signal is input to current compensation circuit, described current compensation circuit produces to compensate electric current with the electric current and a reference signal flowing through capacitive load according to described differential signal so that described compensation electric current and the electric current sum flowing through capacitive load maintain electric current more than silicon controlled.
2. circuit as claimed in claim 1, it is characterised in that described sampling peaker includes:
Voltage sample peaker, for the output voltage of described rectification circuit is sampled, and carries out differential acquisition voltage derivative signal to described output voltage；Or,
Current sample peaker, for the output electric current of described rectification circuit is sampled, and carries out differential acquisition current differential signal to described output electric current.
3. circuit as claimed in claim 1, it is characterised in that described current compensation circuit includes:
Comparison circuit, feedback circuit and load current sampling resistor, described comparison circuit includes comparator；
The first input end of described comparator is connected with described sampling peaker through the 5th resistance, 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 is changed, second input of described comparator is connected with described reference signal, described differential signal through the 5th resistance with the described load current sampling resistor combined effect through described 4th resistance at the first input end of described comparison circuit, described first input end is the sampling end of described comparison circuit；Described comparator for by described load voltage and described differential signal and value and described reference signal compare, and export comparative result；
One input of described feedback circuit is connected with the outfan of described comparator, described feedback circuit output is connected with the first input end of described comparator with described 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, electric current is compensated according to comparative result output, and by described compensation electric current and described load current and value be converted to described load voltage through described load current sampling resistor, the first input end of input extremely described comparator.
4. circuit as claimed in claim 1, it is characterised in that described current compensation circuit includes:
Comparison circuit, feedback circuit and load current sampling resistor, described comparison circuit includes comparator；
The first input end of described comparator is connected with described sampling peaker through the 6th resistance, for receiving described differential signal, described differential signal is through first input end at described comparator of the 6th resistance and described reference signal combined effect, and described first input end is the reference edge of 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 is changed, described comparator for by described differential signal and reference signal and value and described load voltage compare, and export comparative result, the other end ground connection of described load current sampling resistor；
One input of described feedback circuit is connected with the outfan 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, compensates electric current according to comparative result output, and by described compensation electric current and described load current and value be converted to described load voltage through described load current sampling resistor, input is to the second input of comparator.
5. circuit as claimed in claim 2, it is characterised in that described voltage sample peaker includes:
The first electric capacity being connected with described rectification circuit output end；
The first resistance being connected with described first electric capacity, with the second electric capacity of described first resistor coupled in parallel, the other end ground connection of described first resistance；
Described first electric capacity is connected with described current compensation module with the points of common connection of described first resistance.
6. circuit as claimed in claim 2, it is characterised in that described current sample peaker includes:
Be series at and described capacitive load between sampling resistor；
First electric capacity in parallel with described sampling resistor；
Described 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, it is characterised in that also include:
NPN type triode and filter capacitor；
Described first electric capacity is connected with the base stage of described audion with the points of common connection of described first resistance；
The colelctor electrode of described audion is connected with positive source；
The emitter stage of described audion is connected to the ground by emitter resistance；
Described filter capacitor is in parallel with described emitter resistance.
8. the circuit according to claim 5 or 6, it is characterised in that also include:
Diode, described Diode series is between rectification bridge output end and described first electric capacity；The anode of described diode connects rectification bridge output end, and negative electrode connects the first electric capacity；Or,
Described Diode series is between described sampling resistor and described first electric capacity；The anode of described diode connects described sampling resistor, and negative electrode connects the first electric capacity.
9. the circuit as described in claim 3 or 4, it is characterised in that described feedback circuit includes N-type metal-oxide-semiconductor；
The grid of described N-type metal-oxide-semiconductor is connected with the outfan of described comparator；
The drain electrode of described N-type metal-oxide-semiconductor is connected with described capacitive load input；
When described comparator is for by described load voltage and when comparing with described reference signal with value of 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 for by described differential signal and described reference signal and when value and described load voltage compare, the source electrode of described N-type metal-oxide-semiconductor connects one end of described comparator the second input and is connected with described load current sampling resistor.
10. circuit as claimed in claim 1, it is characterised in that described capacitive load includes: LED driver, the filter capacitor in parallel with described LED driver input, the LED light source in parallel with described LED driver outfan.
11. the circuit according to claim 3 or 4, it is characterised in that described current compensation circuit includes an integrated circuit and load current sampling resistor；
Described integrated circuit includes 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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| CN107302813B (en) * | 2016-04-15 | 2019-05-14 | 普诚科技股份有限公司 | A kind of current control circuit |
| CN111010030B (en) * | 2019-11-14 | 2022-01-04 | 深圳市稳先微电子有限公司 | Power control circuit and lighting circuit |
| CN111083828A (en) * | 2019-12-27 | 2020-04-28 | 安徽乐图电子科技有限公司 | Silicon controlled rectifier dimming circuit, dimming method and LED driving circuit applying silicon controlled rectifier dimming circuit and dimming method |
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