CN206402492U - A kind of current ripples eliminate circuit - Google Patents
A kind of current ripples eliminate circuit Download PDFInfo
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- CN206402492U CN206402492U CN201720059866.9U CN201720059866U CN206402492U CN 206402492 U CN206402492 U CN 206402492U CN 201720059866 U CN201720059866 U CN 201720059866U CN 206402492 U CN206402492 U CN 206402492U
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Abstract
A kind of current ripples eliminate circuit, are related to Power Electronic Technique.The current ripples eliminate circuit and are provided with discharge resistance, electric capacity of voltage regulation, bilateral diode, active device isolated gate FET and filter capacitor；The discharge resistance is in parallel with electric capacity of voltage regulation, discharge resistance is connected with the grid and source electrode of active device isolated gate FET respectively with the two ends of electric capacity of voltage regulation parallel circuit, the two ends of two-way two pole are connected with the grid of active device isolated gate FET and drain electrode respectively, the external LED drive circuit of source electrode of active device isolated gate FET, one end of the external LED of drain electrode of active device isolated gate FET, the other end of LED and one end of filter capacitor are connected, and the other end of filter capacitor is connected with the source electrode of active device isolated gate FET.It need to only be connected with LED, you can realize and eliminate LED current ripple, remove stroboscopic, and do not change the characteristics such as the input current of primary circuit, power.
Description
Technical field
The utility model is related to Power Electronic Technique, and circuit is eliminated more particularly, to a kind of current ripples.
Background technology
LED has energy-saving and environmental protection, it is efficient, safe the features such as, be widely used in landscape, street lamp and electronic product backlight
In lamp illumination application.As shown in figure 1, being common constant current driver circuit for LED structure chart, wherein VIN is ac input voltage, and V+ is
Input voltage after rectified bridge rectification, when V+ voltages increase until when exceeding the voltage of LED strip, electric current is begun with LED
Flow through, and increase with increasing for voltage, to after certain value, clamped down on by constant-flow driver, and be maintained certain value.Electric current
I in waveform such as Fig. 2inShown, corresponding input power is Pin=V+×Iin.Again because of LED both end voltages and the electric current for flowing through LED
Relation defers to the characteristic of diode, when electric current remains unchanged, and the voltage at its two ends also remains unchanged, therefore LED negative terminal voltages and V+
Difference in voltage also remains constant, and LED negative terminal waveforms are as shown in LED in Fig. 2.From Fig. 2 it was found from current waveform, there is work in LED
Frequently the bright dark conversion of (being usually 100Hz or 120Hz), thus there is stroboscopic.
Chinese patent CN103269550A discloses a kind of LED current ripple and eliminates circuit, including：One input source, a filtering
Electric capacity and a LED load, the LED load connect a switching tube, and the source class of the switching tube connects a sampling resistor, the switching tube
Gate pole connect an operational amplifier output end, when the input source be one include ripple current source when, the operational amplifier
By comparing voltage signal and a dynamic benchmark voltage signal on the sampling resistor, the switching tube is controlled to make the LED load
Electric current is close to a DC current.
Chinese patent CN104080256A, which discloses a kind of adaptive LED current ripples elimination circuit, to be included：Power tube Q108,
The adaptive reference voltage generating circuit of current sampling resistor R109, operational amplifier U110 and one.Power tube Q108 leakage
Pole connect LED load negative electrode, source electrode connect current sampling resistor R109 one end, operational amplifier U110 inverting input with
And the input of adaptive reference voltage generating circuit；The output termination operational amplifier of adaptive reference voltage generating circuit
U110 in-phase input end；Operational amplifier U110 output termination power tube Q108 grid；Current sampling resistor R109's
The other end eliminates the earth terminal of circuit as the adaptive LED current ripples.Adaptive reference voltage generating circuit is used for basis
Sampled voltage, automatically adjusts its output voltage, operational amplifier U110 is controlled, so as to control power tube Q108 work shape
State is transferred to saturation region from linear zone.
The content of the invention
The purpose of this utility model is that providing current ripples eliminates circuit.
The utility model is provided with discharge resistance, electric capacity of voltage regulation, bilateral diode, active device isolated gate FET and filter
Ripple electric capacity；The discharge resistance is in parallel with electric capacity of voltage regulation, the two ends of discharge resistance and electric capacity of voltage regulation parallel circuit respectively with it is active
Grid and the source electrode connection of device isolation gate field-effect transistor, the two ends of two-way two pole respectively with active device isolated gate FET
Grid and drain electrode connect, the external LED drive circuit of source electrode of active device isolated gate FET, active device insulated gate field
One end of the external LED of drain electrode of effect pipe, the other end of LED and one end of filter capacitor are connected, filter capacitor it is another
End is connected with the source electrode of active device isolated gate FET.
The bilateral diode can be composed in series by 2 reverse zener diodes.
The two ends of the bilateral diode can charged in parallel resistance.
The discharge resistance and electric capacity of voltage regulation parallel circuit and the tie point of bilateral diode, with active device insulated gate field
Amplifying circuit can be provided between effect pipe, the amplifying circuit can use operational amplifier.
The utility model need to only connect with LED, you can realize and eliminate LED current ripple, remove stroboscopic, and do not change original
The characteristics such as input current, the power of circuit.
Brief description of the drawings
Fig. 1 is the existing LED drive circuit composition figure with constant-flow driver.
Fig. 2 is the key operation waveforms in circuit shown in Fig. 1.
Fig. 3 is the principle of equal effects block diagram of circuit shown in Fig. 1.
Fig. 4 is the circuit structure composition figure of the utility model embodiment.
Fig. 5 is the circuit structure composition figure of the utility model embodiment (increase charging resistor).
Fig. 6 is that the modified that the utility model embodiment improves feedback oscillator using amplifier eliminates the drive of LED current ripple
The structural representation of dynamic circuit.
Fig. 7 is that the utility model embodiment improves the circuit structure composition figure of dimming effect in dimmer application.
Fig. 8 is the key operation waveforms figure in circuit shown in Fig. 7.
Embodiment
Referring to Fig. 4~8, the utility model embodiment is provided with discharge resistance R1, electric capacity of voltage regulation C1, bilateral diode, active
Device isolation gate field-effect transistor M1 and filter capacitor C2；The discharge resistance R1 is in parallel with electric capacity of voltage regulation C1, discharge resistance R1 with
The two ends of electric capacity of voltage regulation C1 parallel circuits are connected with active device isolated gate FET M1 grid and source electrode respectively, and two-way two
The two ends of pole are connected with active device isolated gate FET M1 grid and drain electrode respectively, active device isolated gate FET
The M1 external LED drive circuit of source electrode, one end of the active device isolated gate FET M1 external LED of drain electrode, LED
The other end is connected with filter capacitor C2 one end, the filter capacitor C2 other end and active device isolated gate FET M1 source
Pole is connected.
The bilateral diode can be composed in series by 2 reverse zener diodes DZ1 and DZ2.
The two ends of the bilateral diode can charged in parallel resistance R2.
A kind of improved circuit of the elimination LED ripple circuits is as shown in Figure 5.At Zener diode DZ1 and DZ2 two ends
The larger resistance R2 of resistance is incorporated to, the charging path in addition to Zener diode is provided for C1.
Fig. 6 is that the modified that the utility model embodiment improves feedback oscillator using amplifier eliminates the drive of LED current ripple
The structural representation of dynamic circuit.The discharge resistance R1 and electric capacity of voltage regulation C1 parallel circuits and the tie point of bilateral diode, with
Operational amplifier A is provided between active device isolated gate FET M1, due to being used in combination with amplifier circuit, therefore is provided
Higher gain around feedback, further reduces the ripple of LED current.
Fig. 7 is that the utility model embodiment improves the circuit structure composition figure of dimming effect in dimmer application, in LED
Energization input access controllable silicon dimmer Triac, Fig. 8 give work wave main in circuit shown in Fig. 7.Triac
There is the problem of opening point is inconsistent in light modulator output, cause its output waveform to there is big small echo (VIN ' as shown in phantom in Figure 8
And V+ '), and then it is different to have influence in each cycle input-output power, and the problem of there is LED flicker.This practicality is new
Type can filter out the big small echo, so that the problem of avoiding LED optical flare, greatly improves dimming effect.
The utility model can be applied in various LED drive circuits, including：Mu balanced circuit, filter circuit and active device
The feedback circuit with constant current function of composition.When being connected with LED drive circuit, the electric current for flowing through load is free from exchange point
The DC current of amount, but its output voltage is the voltage containing AC compounent.Therefore, the utility model removes ripple electricity described in
Road provides constant current to LED load, and the alternating voltage point in LED current and elimination LED load is maintained by feedback control loop
Amount, to reach the effect for eliminating LED stroboscopics.
Claims (5)
1. a kind of current ripples eliminate circuit, it is characterised in that provided with discharge resistance, electric capacity of voltage regulation, bilateral diode, active device
Part isolated gate FET and filter capacitor；The discharge resistance is in parallel with electric capacity of voltage regulation, and discharge resistance is in parallel with electric capacity of voltage regulation
The two ends of circuit are connected with the grid and source electrode of active device isolated gate FET respectively, and the two ends of two-way two pole are respectively with having
The grid of source device isolation gate field-effect transistor and drain electrode are connected, the external LED drivings of source electrode of active device isolated gate FET
Circuit, one end of the external LED of drain electrode of active device isolated gate FET, the other end of LED and the one of filter capacitor
End connection, the other end of filter capacitor is connected with the source electrode of active device isolated gate FET.
2. a kind of current ripples eliminate circuit as claimed in claim 1, it is characterised in that the bilateral diode is reversely neat by 2
Diode series of receiving are constituted.
3. a kind of current ripples eliminate circuit as claimed in claim 1, it is characterised in that the two ends of the bilateral diode are in parallel
Charging resistor.
4. a kind of current ripples eliminate circuit as claimed in claim 1, it is characterised in that the discharge resistance and electric capacity of voltage regulation are simultaneously
Join the tie point of circuit and bilateral diode, amplifying circuit is provided between active device isolated gate FET.
5. a kind of current ripples eliminate circuit as claimed in claim 4, it is characterised in that the amplifying circuit uses operation amplifier
Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720059866.9U CN206402492U (en) | 2017-01-17 | 2017-01-17 | A kind of current ripples eliminate circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720059866.9U CN206402492U (en) | 2017-01-17 | 2017-01-17 | A kind of current ripples eliminate circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206402492U true CN206402492U (en) | 2017-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720059866.9U Active CN206402492U (en) | 2017-01-17 | 2017-01-17 | A kind of current ripples eliminate circuit |
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| Country | Link |
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| CN (1) | CN206402492U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106658862A (en) * | 2017-01-17 | 2017-05-10 | 厦门奇力微电子有限公司 | Current ripple removal circuit and method |
| CN109167506A (en) * | 2018-10-26 | 2019-01-08 | 苏州菲达旭微电子有限公司 | A kind of current filtering circuit |
| TWI649006B (en) * | 2017-11-07 | 2019-01-21 | 大陸商昂寶電子（上海）有限公司 | Method and system for eliminating LED flicker |
-
2017
- 2017-01-17 CN CN201720059866.9U patent/CN206402492U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106658862A (en) * | 2017-01-17 | 2017-05-10 | 厦门奇力微电子有限公司 | Current ripple removal circuit and method |
| TWI649006B (en) * | 2017-11-07 | 2019-01-21 | 大陸商昂寶電子（上海）有限公司 | Method and system for eliminating LED flicker |
| CN109167506A (en) * | 2018-10-26 | 2019-01-08 | 苏州菲达旭微电子有限公司 | A kind of current filtering circuit |
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