CN212381430U - Phase-cut dimming input signal detection circuit - Google Patents
Phase-cut dimming input signal detection circuit Download PDFInfo
- Publication number
- CN212381430U CN212381430U CN202021347087.7U CN202021347087U CN212381430U CN 212381430 U CN212381430 U CN 212381430U CN 202021347087 U CN202021347087 U CN 202021347087U CN 212381430 U CN212381430 U CN 212381430U
- Authority
- CN
- China
- Prior art keywords
- resistor
- phase
- cut dimming
- module
- input signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses a phase-cut input signal detection circuitry that adjusts luminance, include: the phase-cut dimming module is connected with the input end of the power module and comprises a control unit, and the control unit receives the voltage average value signal and controls the input of the power module; the control unit receives the instantaneous voltage signal and judges whether to receive a voltage average value signal or not and whether to cut off the input of the power supply module or not according to the instantaneous voltage signal; the utility model discloses can detect input signal's effective value voltage and detect input signal's zero crossing point and abnormal point, can realize the condition of following fast and avoid abnormal signal's interference again to the optimization of signal.
Description
Technical Field
The utility model relates to a technical field, especially a phase-cut input signal detection circuit that adjusts luminance.
Background
Under the background of energy conservation and environmental protection, the LED lamp is increasingly applied to the fields of household and commercial illumination because of high light emitting efficiency and good light condensing performance.
In order to meet the requirement of change of illumination brightness, the LED lamp also needs to be provided with a dimming circuit, the front-back phase-shifting dimming system is a common dimming mode, and when the dimming mode is applied to the LED lamp, the problems of waveform abnormity and waveform loss often occur in low-power factor load. The conventional signal detection is divided into two types, namely, continuous and rapid monitoring, and if an input waveform is abnormal, an output waveform can rapidly cause abnormality along with input; secondly, a large amount of data are averaged after sampling at fixed intervals, so that the interference generated by a part of abnormal signals can be eliminated, but the follow-up performance is poor, and the abnormal output is caused by insufficient energy supply because the power supply cannot be quickly shut down when the power is suddenly cut off.
The existing maintaining circuit mainly uses resistance-capacitance energy consumption to maintain a certain output current to ensure the abnormal input signal, but the existing maintaining circuit generates a large amount of heat by the resistance-capacitance.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a phase-cut dimming input signal detection circuit to solve the above technical problem.
A phase cut dimming input signal detection circuit, comprising:
the phase-cut dimming module is connected with the input end of the power module and comprises a control unit, and the control unit receives the voltage average value signal and controls the input of the power module;
the control unit receives the instantaneous voltage signal and judges whether to receive a voltage average value signal or not and whether to cut off the input of the power supply module or not according to the instantaneous voltage signal.
Preferably, the instantaneous voltage acquisition unit includes first resistance and second resistance, first resistance one end is connected the positive pole of the output of phase cut module of adjusting luminance, the other end of first resistance be the sampling point with the signal input part of the control unit is connected, the other end of first resistance simultaneously with the second resistance is established ties, the other end ground connection of second resistance.
Preferably, the phase-cut dimming module is connected to the output end of the phase-cut dimming module, and the phase-cut dimming module is connected to the output end of the phase-cut dimming module.
Preferably, the maintaining module includes a controllable reference source, a switching unit, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor, the third resistor, the seventh resistor, and the eighth resistor are connected in series, the other end of the third resistor is connected to the positive electrode of the output end of the phase-cut dimming module, the other end of the eighth resistor is grounded, the controllable reference source includes a reference electrode connected between the third resistor and the seventh resistor, a cathode connected to one end of the fourth resistor, and a grounded anode, the other end of the fourth resistor is connected to the positive electrode of the output end of the phase-cut dimming module, the cathode is further connected to the control terminal of the switching unit, the positive connection terminal of the switching unit is connected to one end of the fifth resistor, the fifth resistor is connected to the positive electrode of the output end of the phase-cut dimming module, and the negative connection terminal of the switching unit is connected to one end of the sixth resistor, the other end of the sixth resistor is connected between the seventh resistor and the eighth resistor.
Preferably, the sampling point of the instantaneous voltage acquisition unit is the negative connection end of the switch unit.
Preferably, the instantaneous voltage acquisition unit comprises a first resistor and a second resistor, one end of the first resistor (R1) is connected with the negative connection end of the switch unit, the other end of the first resistor is connected with the signal input end of the control unit as a sampling point, the other end of the first resistor is connected with the second resistor in series, and the other end of the second resistor is grounded.
Preferably, the maintaining module further comprises at least one of a second capacitor, a third capacitor and a fourth capacitor;
one end of the second capacitor is connected with the reference electrode of the controllable reference source, and the other end of the second capacitor is grounded;
two ends of the third capacitor are respectively connected with the reference electrode and the cathode of the controllable reference source;
and two ends of the fourth capacitor are respectively connected with the control end and the positive connecting end of the switch unit.
Preferably, the voltage average value acquisition unit comprises a ninth resistor, a tenth resistor and a first capacitor;
after the ninth resistor and the tenth resistor are connected in series, the other end of the ninth resistor is connected with the anode of the output end of the phase-cut dimming module, and the other end of the tenth resistor is grounded;
one end of the first capacitor is connected between the ninth resistor and the tenth resistor and is used as a sampling point, and the other end of the first capacitor is grounded.
The technical effects of the utility model:
the utility model discloses a phase cut input signal detection circuitry of adjusting luminance, effective value voltage that can detect input signal through this circuit and the zero crossing point and the abnormal point that detect input signal, can realize the condition of following fast and can avoid the interference of abnormal signal again through the optimization processing of this method to the signal, realize simultaneously that the on-state maintains resistance when input voltage is lower, the electric current that produces like this under the same maintenance current will be far less than resistance-capacitance and maintain the scheme, improves the efficiency.
Drawings
Embodiments of the present invention are described below with reference to the accompanying drawings, in which:
fig. 1 is a structural wire frame diagram of a phase-cut dimming input signal detection circuit according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a phase-cut dimming input signal detection circuit according to an embodiment of the present invention.
Fig. 3 is a structural wire frame diagram of a phase-cut dimming input signal detection circuit according to another embodiment of the present invention.
Fig. 4 is a circuit diagram of the phase-cut dimming input signal detection circuit of fig. 3.
Fig. 5 is a circuit diagram of a phase-cut dimming input signal detection circuit according to another embodiment of the present invention.
Fig. 6 is a circuit diagram of a phase-cut dimming input signal detection circuit according to another embodiment of the present invention.
Fig. 7 is a circuit diagram of a phase-cut dimming input signal detection circuit according to another embodiment of the present invention.
Fig. 8 is a line frame flowchart of the phase-cut dimming input signal detection method of the present invention.
Detailed Description
The following describes in further detail specific embodiments of the present invention based on the drawings. It should be understood that the description herein of embodiments of the invention is not intended to limit the scope of the invention.
As shown in fig. 1 and 2, the phase-cut dimming input signal detection circuit 1000 of the present embodiment includes a voltage average value acquisition unit 100 and an instantaneous voltage acquisition unit 400. The phase-cut dimming input signal detection circuit 1000 is configured to detect a phase-cut dimming input signal output from the phase-cut dimming module 200, where the phase-cut dimming module 200 is connected to a high-voltage power supply (mains) and an output terminal of the phase-cut dimming input signal is connected to a power supply module 300 for supplying power to a lamp. The voltage average value acquisition unit 100 is connected with the output end of the phase-cut dimming module 200 to acquire and output a voltage average value signal, the phase-cut dimming module 200 is further connected with the input end of the power module 300, the power module 300 comprises a control unit 301, and the control unit 301 receives the voltage average value signal and controls the input of the power module 300; the instantaneous voltage collecting unit 400 is connected to the output end of the phase-cut dimming module 200, and the control unit 301 receives the instantaneous voltage signal and determines whether to receive the voltage average signal and whether to cut off the input of the power module 300 according to the instantaneous voltage signal.
The phase-cut dimming module 200 and the power module 300 are both in the prior art and are not described herein. The control unit 301 can adopt a single chip microcomputer, the technology is mature, the function is strong, and the purchase is convenient.
The instantaneous voltage acquisition unit 400 includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the positive electrode of the output end of the phase-cut dimming module 200, the other end of the first resistor R1 is a sampling point and is connected to the signal input end of the control unit 301, the other end of the first resistor R1 is connected to the second resistor R2 in series, and the other end of the second resistor R2 is connected to the ground.
The voltage average value acquisition unit 100 comprises a ninth resistor R9, a tenth resistor R10 and a first capacitor C1; after the ninth resistor R9 and the tenth resistor R10 are connected in series, the other end of the ninth resistor R9 is connected to the positive electrode of the output end of the phase-cut dimming module 200, and the other end of the tenth resistor R10 is grounded; one end of the first capacitor C1 is connected between the ninth resistor R9 and the tenth resistor R10 as a sampling point, and the other end is grounded.
Each resistor in the present embodiment is for illustration, and the actual number and form (series-parallel connection) of each resistor may be changed according to the actual situation.
As shown in fig. 8, the phase-cut dimming input signal detection method of the present embodiment includes the following steps:
(1) collecting an instantaneous voltage signal at the output end of the phase-cut dimming module 200, and transmitting the instantaneous voltage signal to the control unit 301 in the power module 300;
(2) the control unit 301 judges whether the instantaneous voltage signal is normal, if so, the step (3) is carried out, otherwise, the step (1) is carried out, and if the continuous cycle times of the steps (1) and (2) exceed the preset value, the step (4) is carried out; the control unit 301 determines that the instantaneous voltage signal normally needs to satisfy the following two conditions:
2.1 relative to the first N instantaneous voltage signals, whether the current instantaneous voltage signal is a periodic signal or not;
2.2 whether the variation of the instantaneous voltage signal exceeds the set value M, wherein M is the trend of the first N signals and the estimated variation of the back N +1 signal. N is a positive integer, generally between 5 and 20.
(3) Collecting a voltage average value signal at the output end of the phase-cut dimming module 200, and receiving and outputting a load control signal by the control unit 301 according to the voltage average value signal;
(4) the control unit 301 cuts off the output of the power module 300.
As shown in fig. 3 and 4, in another embodiment, the phase-cut dimming input signal detection circuit 1000 further includes a maintaining module 500 connected to an output terminal of the phase-cut dimming module 200 for maintaining the phase-cut dimming module 200 to normally operate. The maintenance module 500 may prevent severe distortion of the phase cut waveform, dropping half of the waveform, or multiple switching spikes from occurring to maintain proper operation of the phase cut dimmer. In this embodiment, the maintaining module 500 includes a controllable reference source 501, a switch unit 502, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8, the third resistor R3, the seventh resistor R7 and the eighth resistor R8 are connected in series, the other end of the third resistor R3 is connected to the positive electrode of the output terminal of the phase-cut dimming module 200, the other end of the eighth resistor R8 is grounded, the controllable reference source 501 includes a reference electrode R connected between the third resistor R3 and the seventh resistor R7, a cathode k connected to one end of the fourth resistor R4 and a grounded anode a, the other end of the fourth resistor R4 is connected to the positive electrode of the output terminal of the phase-cut dimming module 200, the cathode k is further connected to the control terminal of the switch unit 502, the positive connection terminal of the switch unit 502 is connected to one end of the fifth resistor R5, the fifth resistor R5 is connected to the positive electrode of the output terminal of the phase-cut dimming module 200, the negative connection terminal of the switch unit 502 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected between the seventh resistor R7 and the eighth resistor R8.
The controllable reference source 501 has a cathode, an anode, and a reference terminal, and the current passing from the anode to the cathode increases when the voltage of the reference terminal is higher than an internal reference (preset value). The current passing from anode to cathode decreases when the reference voltage is lower than the internal reference (preset value). The voltage control is realized by controlling the magnitude of the passing current to control the resistance voltage drop on the bus thereof, such AS TL431, AS431, AZ431 and the like, and in the embodiment, TL431 is adopted and is denoted by N1. The switching unit 502 is a MOS transistor in this embodiment, and is denoted by Q1.
In another embodiment, as shown in fig. 5, the sampling point of the instantaneous voltage acquisition unit 400 is the negative connection terminal of the switch unit 502. Therefore, the operation of collecting the instantaneous voltage signal at the output end of the phase-cut dimming module 200 in the step (1) is only performed when the switching unit 502 is turned on, so that the energy consumption is reduced and the energy efficiency is improved.
In another embodiment, as shown in fig. 6, the maintaining module 500 further includes a second capacitor C2, a third capacitor C3, and a fourth capacitor C4, wherein one end of the second capacitor C2 is connected to the reference pole r of the controllable reference source 501, and the other end is grounded; two ends of the third capacitor C3 are respectively connected with the reference electrode r and the cathode k of the controllable reference source 501; two ends of the fourth capacitor C4 are respectively connected to the control end and the positive connection end of the switch unit 502.
As shown in fig. 7, in another embodiment, the instantaneous voltage acquisition unit 400 includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the negative connection end of the switch unit 502, the other end of the first resistor R1 is connected to the signal input end of the control unit 301 as a sampling point, the other end of the first resistor R1 is connected in series with the second resistor R2, and the other end of the second resistor R2 is connected to ground.
The phase-cut dimming input signal detection methods of the above embodiments are all shown in fig. 8.
The above description is only for the preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention, and any modification, equivalent replacement or improvement within the spirit of the present invention is encompassed by the claims of the present invention.
Claims (8)
1. A phase cut dimming input signal detection circuit (1000), comprising:
the phase-cut dimming control system comprises a voltage average value acquisition unit (100), a phase-cut dimming module (200), a power module (300) and a control unit (301), wherein the voltage average value acquisition unit (100) is connected with the output end of the phase-cut dimming module (200) and is used for acquiring and outputting a voltage average value signal, the phase-cut dimming module (200) is also connected with the input end of the power module (300), the power module (300) comprises the control unit (301), and the control unit (301) is used for receiving the voltage;
the phase-cut dimming circuit is characterized by further comprising an instantaneous voltage acquisition unit (400) connected with the output end of the phase-cut dimming module (200), wherein the control unit (301) receives an instantaneous voltage signal and judges whether to receive a voltage average value signal or not and whether to cut off the input of the power supply module (300) or not according to the instantaneous voltage signal.
2. The phase-cut dimming input signal detection circuit (1000) of claim 1, wherein the instantaneous voltage acquisition unit (400) comprises a first resistor (R1) and a second resistor (R2), one end of the first resistor (R1) is connected to the positive electrode of the output end of the phase-cut dimming module (200), the other end of the first resistor (R1) is connected to the signal input end of the control unit (301) as a sampling point, the other end of the first resistor (R1) is connected to the second resistor (R2) in series, and the other end of the second resistor (R2) is connected to the ground.
3. The phase-cut dimming input signal detection circuit (1000) of claim 1, wherein a maintaining module (500) connected to an output of the phase-cut dimming module (200) for maintaining the normal operation of the phase-cut dimming module (200).
4. The phase-cut dimming input signal detection circuit (1000) of claim 3, wherein the maintaining module (500) comprises a controllable reference source (501), a switching unit (502), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7) and an eighth resistor (R8), the third resistor (R3), the seventh resistor (R7) and the eighth resistor (R8) are connected in series, the other end of the third resistor (R3) is connected to the positive pole of the output terminal of the phase-cut dimming module (200), the other end of the eighth resistor (R8) is grounded, the controllable reference source (501) comprises a reference pole (R) connected between the third resistor (R3) and the seventh resistor (R7), a cathode (k) connected to one end of the fourth resistor (R4) and an anode (a) connected to the ground, and the other end of the fourth resistor (R4) is connected to the positive pole of the phase-cut dimming module (200) The cathode (k) is further connected with a control end of the switch unit (502), a positive connecting end of the switch unit (502) is connected with one end of the fifth resistor (R5), the fifth resistor (R5) is connected with a positive electrode of an output end of the phase-cut dimming module (200), a negative connecting end of the switch unit (502) is connected with one end of the sixth resistor (R6), and the other end of the sixth resistor (R6) is connected between the seventh resistor (R7) and the eighth resistor (R8).
5. The phase-cut dimming input signal detection circuit (1000) according to claim 4, wherein the sampling point of the instantaneous voltage acquisition unit (400) is the negative connection terminal of the switching unit (502).
6. The phase-cut dimming input signal detection circuit (1000) of claim 4, wherein the instantaneous voltage acquisition unit (400) comprises a first resistor (R1) and a second resistor (R2), one end of the first resistor (R1) is connected with the negative connection end of a switch unit (502), the other end of the first resistor (R1) is connected with the signal input end of the control unit (301) for a sampling point, the other end of the first resistor (R1) is simultaneously connected with the second resistor (R2) in series, and the other end of the second resistor (R2) is grounded.
7. The phase cut dimming input signal detection circuit (1000) of claim 4, wherein the maintaining module (500) further comprises at least one of a second capacitance (C2), a third capacitance (C3), and a fourth capacitance (C4);
one end of the second capacitor (C2) is connected with the reference pole (r) of the controllable reference source (501), and the other end of the second capacitor (C2) is grounded;
two ends of the third capacitor (C3) are respectively connected with a reference electrode (r) and a cathode (k) of the controllable reference source (501);
two ends of the fourth capacitor (C4) are respectively connected with the control end and the positive connecting end of the switch unit (502).
8. The phase-cut dimming input signal detection circuit (1000) according to any one of claims 1 to 7, wherein the voltage average value collecting unit (100) comprises a ninth resistor (R9), a tenth resistor (R10) and a first capacitor (C1);
after the ninth resistor (R9) and the tenth resistor (R10) are connected in series, the other end of the ninth resistor (R9) is connected to the positive electrode of the output end of the phase-cut dimming module (200), and the other end of the tenth resistor (R10) is grounded;
one end of the first capacitor (C1) is connected between the ninth resistor (R9) and the tenth resistor (R10) and serves as a sampling point, and the other end of the first capacitor is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021347087.7U CN212381430U (en) | 2020-07-09 | 2020-07-09 | Phase-cut dimming input signal detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021347087.7U CN212381430U (en) | 2020-07-09 | 2020-07-09 | Phase-cut dimming input signal detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212381430U true CN212381430U (en) | 2021-01-19 |
Family
ID=74164373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021347087.7U Active CN212381430U (en) | 2020-07-09 | 2020-07-09 | Phase-cut dimming input signal detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212381430U (en) |
-
2020
- 2020-07-09 CN CN202021347087.7U patent/CN212381430U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102057752B (en) | Dimmer circuit, dimmer system and dimmable device | |
| CN101916548B (en) | Control circuit of light-emitting diode (LED) lamp tube of liquid crystal display | |
| CN101646288B (en) | Dimming method applicable to traditional dimmers and LED dimmable drive power | |
| CN201937885U (en) | Three-line dimmer | |
| CN105282929A (en) | Full voltage segmented linear constant current LED drive circuit capable of switching modes automatically | |
| CN104322151A (en) | Method and apparatus for phase-controlling a load | |
| CN110536506B (en) | LED stroboscopic flashing circuit | |
| CN107995721B (en) | DALI adjusting control circuit | |
| CN212183779U (en) | LED drive circuit with multipath output automatic adjustment function | |
| CN110035582A (en) | LED lamp tube | |
| CN102548093A (en) | Direct-current light emitting diode (LED) constant-current driving circuit and LED lamp | |
| CN116916489A (en) | LED light intelligent controller | |
| CN110602834A (en) | Circuit and method for controlling brightness of emergency lighting lamp by using switch | |
| CN212381430U (en) | Phase-cut dimming input signal detection circuit | |
| CN102083267B (en) | Electricity saving device | |
| CN109379806B (en) | Dimming drive circuit, dimming controller and LED lamp | |
| CN105208750A (en) | LED constant current driving device | |
| CN111901919A (en) | Phase-cut dimming input signal detection circuit and method | |
| CN212413472U (en) | Dimming LED controller | |
| US8502518B2 (en) | Power supply device for light sources, such as halogen lamps, and related method | |
| CN213342763U (en) | Two-wire system back edge light modulator | |
| CN212344104U (en) | LED fluorescent tube based on silicon controlled rectifier adjusts luminance | |
| CN211457454U (en) | Double-color temperature circuit | |
| CN204795799U (en) | LED drive circuit can adjust luminance | |
| CN210670654U (en) | Circuit for controlling brightness of emergency lighting lamp by using switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |