CN203618174U - Protective circuit for reducing current source ripple - Google Patents
Protective circuit for reducing current source ripple Download PDFInfo
- Publication number
- CN203618174U CN203618174U CN201320802582.6U CN201320802582U CN203618174U CN 203618174 U CN203618174 U CN 203618174U CN 201320802582 U CN201320802582 U CN 201320802582U CN 203618174 U CN203618174 U CN 203618174U
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- impedance
- adjustable tube
- output
- current source
- ripple
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- 230000001681 protective effect Effects 0.000 title claims abstract description 19
- 230000001629 suppression Effects 0.000 claims description 18
- 230000009467 reduction Effects 0.000 claims description 4
- 230000006378 damage Effects 0.000 abstract description 6
- 238000013021 overheating Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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Abstract
The utility model provides a protective circuit for reducing current source ripples. The protective circuit comprises a comparison circuit, wherein a first input end of the comparison circuit is connected with one end of an impedance adjustable pipe, a second input end is connected with a reference signal V2, an output end controls the impedance magnitude of the impedance adjustable pipe, voltages V1 at two ends of the impedance adjustable pipe are detected through the first input end and are compared with the reference signal V2 of the second input end, when the voltages V1 at the two ends of the impedance adjustable pipe exceed the value of the reference signal V2, the comparison circuit outputs a control signal for controlling the impedance of the impedance adjustable pipe to be reduced, so that the voltages at the two ends do not exceed the V2, therefore, the continuous increasing of the impedance of the impedance adjustable pipe is limited when the ripples are high, and the damages to the impedance adjustable pipe due to overheating caused by overhigh impedance is avoided.
Description
Technical field
The utility model relates to circuit field, relates in particular to a kind of protective circuit that reduces current source ripple.
Background technology
Current source can provide the direct current at certain amplitude stability to load, therefore, having wide range of applications of current source, but, because causing the direct current of current source output, the circuit of current source inside there is ripple, the direct current that is current source output is not an invariable current value, but fluctuation within the specific limits.
Wherein, LED driver is exactly a typical current source, can provide the direct current of stablizing amplitude for LED lamp.But some LED drivers, because the speed of its electric current loop is slower, or the capacity of its output capacitor is hour, and LED driver output current amplitude can fluctuate within the specific limits, and this output current has ripple.In order to reduce ripple, conventionally at the output of LED driver, the ripple suppression circuit of connecting with load, comprise impedance adjustable tube S and control circuit, as shown in Figure 1, by regulating the impedance magnitude of this impedance adjustable tube S, the ripple size of restriction LED driver output current.
But in the time that the output current ripple of LED driver is excessive, this impedance adjustable tube is in order to suppress ripple, its impedance meeting is adjusted to very large, and impedance adjustable tube both end voltage is born very large voltage, causes impedance adjustable tube overheated and damage.Cause loop open circuit, the ripple suppression circuit of series connection not only not to play inhibitory action if impedance adjustable tube is overheated, but also affected the normal work of LED driver, make the LED lamp of rear class can not be normally luminous.
Utility model content
In view of this; the utility model provides a kind of protective circuit that reduces current source ripple; effectively solved the impedance adjustable tube reducing in prior art in current source ripple circuit in inhibition ripple process, the impedance adjustable tube causing because current source ripple is excessive is crossed the problem of cause thermal damage.
For achieving the above object, the utility model provides following technical scheme:
Reduce a protective circuit for current source ripple, described current source output connects load, and this protective circuit comprises impedance adjustable tube, Ripple Suppression control circuit and comparison circuit;
After described load is connected with impedance adjustable tube, be connected to the output of described current source;
Described Ripple Suppression control circuit output connects impedance adjustable tube, for the impedance magnitude of control group adjustable tube, suppresses the output current ripple of described current source;
Described comparison circuit comprises first input end, the second output and output;
The first input end of described comparison circuit connects one end of impedance adjustable tube, obtains the voltage at impedance adjustable tube two ends, and the second input connects reference signal V2, the impedance magnitude of its output control group adjustable tube.
Preferably, described comparison circuit comprises operational amplifier O1, and the normal phase input end of operational amplifier O1 connects one end of impedance adjustable tube, and its negative-phase input connects reference signal V2; Its output connects the control end of impedance adjustable tube.
Preferably, described comparison circuit comprises operational amplifier O1, and the normal phase input end of operational amplifier O1 connects one end of impedance adjustable tube, and its negative-phase input connects reference signal V2; Its output connects the control end of impedance adjustable tube by Ripple Suppression control circuit.
Preferably, described comparison circuit also comprises compensating network, is connected between the negative-phase input or output of described operational amplifier O1.
Known via above-mentioned technical scheme, compared with prior art, the utility model provides the protective circuit that reduces current source ripple, comprise comparison circuit, wherein, the first input end of comparison circuit connects one end of impedance adjustable tube, the second input connects reference signal V2, the impedance magnitude of its output control group adjustable tube, detect the voltage V1 at impedance adjustable tube two ends by first input end, compare with the reference signal V2 of the second input, in the time that the both end voltage V1 of impedance adjustable tube exceedes the value of this reference signal V2, the impedance of comparison circuit output control signal control group adjustable tube reduces, make its both end voltage be no more than V2, like this, the impedance that has limited impedance adjustable tube in the time that ripple is large continues to increase, avoid impedance adjustable tube to cause the overheated damage causing because impedance is too high.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment 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 embodiment of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
Fig. 1 is the circuit diagram of reduction current source ripple circuit of the prior art;
The first that Fig. 2 provides for the utility model reduces the circuit diagram of the protective circuit of current source ripple;
The second that Fig. 3 provides for the utility model reduces the circuit diagram of the protective circuit of current source ripple;
Fig. 4 provide for the utility model the third reduce the circuit diagram of the protective circuit of current source ripple.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment mono-
The utility model embodiment provides the first to reduce the protective circuit of current source ripple, and described current source output connects load, comprises impedance adjustable tube S, Ripple Suppression control circuit and comparison circuit.With reference to Fig. 1, in this circuit, after load is connected with impedance adjustable tube S, be connected to the output of described current source;
Described Ripple Suppression control circuit output connects impedance adjustable tube S, for the impedance magnitude of control group adjustable tube S, suppresses the output current ripple of described current source;
Described comparison circuit comprises first input end, the second output and output;
The first input end of described comparison circuit connects one end of impedance adjustable tube S, obtains the voltage at impedance adjustable tube S two ends, and the second input connects reference signal V2, the impedance magnitude of its output control group adjustable tube S.
In foregoing circuit, current source can be LED driver, and load can be LED lamp, and the output current of described current source has ripple.
In the time that load is LED lamp, the anode of load, is also the positive output end of the anodic bonding LED driver of LED lamp; The negative terminal of load, is also the hot end of the negative electrode connection impedance adjustable tube S of LED lamp, and the cold end of impedance adjustable tube S connects the negative output terminal of LED driver.
Wherein, when the both end voltage of impedance adjustable tube S is not during higher than reference signal V2 in comparison circuit, the impedance magnitude of Ripple Suppression control circuit control group adjustable tube S, suppresses the output current ripple of current source within the specific limits.
Described comparison circuit, obtains the voltage of impedance adjustable tube S by first input end, and with the reference signal V2 comparison of the second input, according to the impedance magnitude of comparative result output signal control group adjustable tube S, make its both end voltage be no more than reference signal V2.
It should be noted that, the reference signal V2 in the application, can be the voltage signal of fixed amplitude, can be also the voltage signal that amplitude changes.For example, the signal that reference signal V2 can change for amplitude under a certain signal controlling, or, for amplitude is according to the signal of a certain Changing Pattern variation.
Wherein, impedance adjustable tube S can be for being operated in arbitrarily the adjustable state of switch pipe of impedance, as metal-oxide-semiconductor, and triode etc.The described adjustable state of switch pipe of impedance that is operated in, refers to: the state of impedance when switching tube is operated in impedance ranges and is more than or equal to saturation conduction.
It should be noted that, from the description of foregoing circuit, can find out, for the control of impedance adjustable tube S, the priority of comparison circuit is higher than Ripple Suppression control circuit.
The first input end of comparison circuit of the present utility model connects one end of impedance adjustable tube, the second input connects reference signal V2, the impedance magnitude of its output control group adjustable tube, detect the voltage V1 at impedance adjustable tube two ends by first input end, compare with the reference signal V2 of the second input, in the time that the both end voltage V1 of impedance adjustable tube exceedes the value of this reference signal V2, the impedance of comparison circuit output control signal control group adjustable tube reduces, make its both end voltage be no more than V2, like this, the impedance that has limited impedance adjustable tube in the time that ripple is large continues to increase, avoid impedance adjustable tube to cause the overheated damage causing because impedance is too high.
Embodiment bis-
Refer to Fig. 3; for the disclosed the second of the utility model embodiment reduces the circuit diagram of the protective circuit of current source ripple; identical with embodiment mono-of the annexation of current source, load, impedance adjustable tube S and Ripple Suppression control circuit in this circuit; please refer to the description in embodiment mono-, this is no longer going to repeat them.Comparison circuit in the present embodiment is the embodiment of embodiment mono-.
Described comparison circuit, comprises operational amplifier O1, and the normal phase input end of operational amplifier O1 connects one end of impedance adjustable tube S, and its negative-phase input connects reference signal V2; Its output connects the control end of impedance adjustable tube S.
In the time that impedance adjustable tube S is N-type switching tube, the one end that connects load is its hot end, and because the other end of impedance adjustable tube S connects the negative output terminal of current source, the reference ground of the comparison circuit in the application is also the negative output terminal of current source, therefore, impedance adjustable tube S connects one end of load, is also one end of the normal phase input end of concatenation operation amplifier O1, and the voltage of this point is also the voltage at impedance adjustable tube S two ends.
In conjunction with Fig. 3, the operation principle of describing the present embodiment is:
While not connecting comparison circuit, in the time that output current ripple is very large, Ripple Suppression control circuit is in order to make output current be no more than a certain value, and the impedance of control group adjustable tube increases along with the increase of current source output voltage, cause the power of impedance adjustable tube to increase along with the increase of output voltage, while exceeding a certain performance number, impedance adjustable tube S can damage because of overheated;
While being connected with comparison circuit, when impedance adjustable tube is under the effect of Ripple Suppression control circuit, its impedance is along with output voltage increases, both end voltage also increases along with the increase of output voltage, and in the time that both end voltage increases to reference signal V2, the impedance of comparison circuit control group adjustable tube reduces, so that its both end voltage is no more than reference signal V2, like this, impedance adjustable tube can not damaged because power is too high, and also plays certain inhibitory action for the ripple of output current.
Embodiment tri-
The application's comparison circuit, except as shown in Fig. 3 of embodiment bis-, amplifier O1 output directly connects impedance adjustable tube S, can also pass through the impedance magnitude of other circuit control group adjustable tube, for example the present embodiment three, with reference to Fig. 4.
The present embodiment is identical, different with operation principle and the annexation of current source, load, impedance adjustable tube S and the Ripple Suppression control circuit of embodiment bis-: the output of comparison circuit is connected in Ripple Suppression control circuit.That is to say, the not direct control group adjustable tube of comparison circuit, but by the impedance of Ripple Suppression control circuit control group adjustable tube, make its voltage be no more than the amplitude of reference signal V2.
To sum up, the utility model provides a kind of protective circuit that reduces current source ripple, comprise comparison circuit, wherein, comparison circuit detects the voltage V1 at impedance adjustable tube two ends by first input end, compare with the reference signal V2 of the second input, in the time that the both end voltage V1 of impedance adjustable tube exceedes the value of this reference signal V2, the impedance of comparison circuit output control signal control group adjustable tube reduces, make its both end voltage be no more than V2, like this, the impedance that has limited impedance adjustable tube in the time that ripple is large continues to increase, avoid impedance adjustable tube to cause the overheated damage causing because impedance is too high.
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 identical similar part mutually referring to.For the disclosed device of embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates referring to method part.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the utility model.To be apparent for those skilled in the art to the multiple modification of these embodiment, General Principle as defined herein can, in the situation that not departing from spirit or scope of the present utility model, realize in other embodiments.Therefore, the utility model 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 (4)
1. reduce a protective circuit for current source ripple, described current source output connects load, it is characterized in that: comprise impedance adjustable tube, Ripple Suppression control circuit and comparison circuit;
After described load is connected with impedance adjustable tube, be connected to the output of described current source;
Described Ripple Suppression control circuit output connects impedance adjustable tube, for the impedance magnitude of control group adjustable tube, suppresses the output current ripple of described current source;
Described comparison circuit comprises first input end, the second output and output;
The first input end of described comparison circuit connects one end of impedance adjustable tube, obtains the voltage at impedance adjustable tube two ends, and the second input connects reference signal V2, the impedance magnitude of its output control group adjustable tube.
2. the protective circuit of reduction current source ripple according to claim 1, is characterized in that, described comparison circuit comprises operational amplifier O1, and the normal phase input end of operational amplifier O1 connects one end of impedance adjustable tube, and its negative-phase input connects reference signal V2; Its output connects the control end of impedance adjustable tube.
3. the protective circuit of reduction current source ripple according to claim 1, is characterized in that, described comparison circuit comprises operational amplifier O1, and the normal phase input end of operational amplifier O1 connects one end of impedance adjustable tube, and its negative-phase input connects reference signal V2; Its output connects the control end of impedance adjustable tube by Ripple Suppression control circuit.
4. according to the protective circuit of the reduction current source ripple described in claim 2 or 3, it is characterized in that, also comprise compensating network, be connected between the negative-phase input and output of described operational amplifier O1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320802582.6U CN203618174U (en) | 2013-12-06 | 2013-12-06 | Protective circuit for reducing current source ripple |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320802582.6U CN203618174U (en) | 2013-12-06 | 2013-12-06 | Protective circuit for reducing current source ripple |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203618174U true CN203618174U (en) | 2014-05-28 |
Family
ID=50770789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320802582.6U Expired - Lifetime CN203618174U (en) | 2013-12-06 | 2013-12-06 | Protective circuit for reducing current source ripple |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203618174U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019165589A1 (en) * | 2018-02-28 | 2019-09-06 | Tridonic Gmbh & Co Kg | Ripple suppression circuit, controlling method and driving equipment |
-
2013
- 2013-12-06 CN CN201320802582.6U patent/CN203618174U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019165589A1 (en) * | 2018-02-28 | 2019-09-06 | Tridonic Gmbh & Co Kg | Ripple suppression circuit, controlling method and driving equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: INVENTRONICS (HANGZHOU), INC. Free format text: FORMER NAME: YINGFEITE ELECTRONIC (HANGZHOU) CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: Hangzhou City, Zhejiang province 310053 Binjiang District Dongxin Road No. 66 Oriental Communication B block 309, 310, 311. Patentee after: INVENTRONICS (HANGZHOU), Inc. Address before: Hangzhou City, Binjiang District province six and 310053 Zhejiang Road No. 368 building the North Sea base 3 Patentee before: INVENTRONICS (HANGZHOU) Co.,Ltd. |
|
| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: Hangzhou City, Zhejiang Province, Binjiang District 310053 Liuhe Road No. 368 building 3 North Sea Base Patentee after: INVENTRONICS (HANGZHOU), Inc. Address before: Hangzhou City, Zhejiang province 310053 Binjiang District Dongxin Road No. 66 Oriental Communication B block 309, 310, 311. Patentee before: INVENTRONICS (HANGZHOU), Inc. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20140528 |
|
| CX01 | Expiry of patent term |