CN111225473A - Dimming switch circuit and dimming method based on ballast - Google Patents
Dimming switch circuit and dimming method based on ballast Download PDFInfo
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- CN111225473A CN111225473A CN202010176587.7A CN202010176587A CN111225473A CN 111225473 A CN111225473 A CN 111225473A CN 202010176587 A CN202010176587 A CN 202010176587A CN 111225473 A CN111225473 A CN 111225473A
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Abstract
The invention relates to the technical field of electronic circuits, in particular to a dimming switch circuit and a dimming method based on a ballast, and the dimming switch circuit comprises a rectifying module, a first voltage-reducing module, a second voltage-reducing module, a sampling module, a control module, an energy storage inductor L1, a freewheeling diode D2, a filter capacitor E2 and a switching tube T2. The invention achieves the purpose of adjusting the output voltage of the ballast by controlling the PWM duty ratio through the control module, and simultaneously adjusts the PWM duty ratio by detecting the voltage output by the ballast, so that the output voltage of each grade of ballast keeps accurate, thereby achieving the purpose of dimming.
Description
Technical Field
The invention relates to the technical field of dimming switches, in particular to a dimming switch circuit and a dimming method based on a ballast.
Background
In recent years, many breakthroughs are made in the research and development aspects of various new light sources, and with the improvement of the life quality of people, new requirements on living environment gradually exist.
The light source illumination of the light emitting diode is often used by people to replace a fluorescent lamp as a traditional light source due to the advantages of high light efficiency, long service life, low cost and the like; the traditional fluorescent lamp driving end is often required to be provided with a ballast for driving on a power supply, and a compatible circuit compatible with the ballast is required to be arranged in a lamp tube when the fluorescent lamp is replaced by a light emitting diode; and because the conducting voltage of the LED lamp beads on the lamp tube is basically a fixed value, and the output current of the ballast can also be regarded as an approximate constant current, the output power of the lamp tube of the LED switch circuit based on the ballast is also a fixed value, and the brightness of the lamp tube cannot be adjusted.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned shortcomings in the prior art, and provides a dimming switch circuit and a dimming method based on a ballast, which are compatible with a high-frequency ballast and capable of dimming.
The purpose of the invention is realized by the following technical scheme: a dimming switch circuit based on a ballast comprises a rectifying module, a first voltage reduction module, a second voltage reduction module, a sampling module, a control module, an energy storage inductor L1, a freewheeling diode D2, a filter capacitor E2 and a switch tube T2;
the input end of the rectifying module is connected with the ballast; the first voltage reduction module is connected with the output end of the rectification module and is used for providing driving voltage for the switching tube T2; the second voltage reduction module is used for supplying power to the control module; the control end of the switch tube T2 is connected with the control module; the control module is used for outputting a PWM signal to control the switch tube T2 to work; one end of the energy storage inductor L1 is connected with the output end of the rectifying module; the other end of the energy storage inductor L1 is connected with the switch end of a switch tube T2 through a filter capacitor E2; one end of the energy storage inductor L1 is connected with the switch end of the switch tube T2 through a freewheeling diode D2;
and the output end of the rectification module is connected with the control module through the sampling module.
The invention further provides that the rectifier module comprises a rectifier bridge BR 1; two input ends of the rectifier bridge BR1 are respectively connected with the ballast; the negative output end of the rectifier bridge BR1 is grounded; the positive output end of the rectifier bridge BR1 is respectively connected with one end of the energy storage inductor L1, the first voltage reduction module and the sampling module; and a capacitor C1 is arranged between the positive output end of the rectifier bridge BR1 and the negative output end of the rectifier bridge BR 1.
The invention is further configured that the first voltage reduction module comprises a triode T1, a voltage regulator tube D1 and a resistor R1; one end of the resistor R1 is connected with the output end of the rectifying module; the other end of the resistor R1 is connected with the base electrode of the triode T1; the collector of the triode T1 is connected with one end of a resistor R1; the base electrode of the triode T1 is connected with the negative electrode of a voltage regulator tube D1; the anode of the voltage regulator tube D1 is grounded; the emitter of the triode T1 is connected to the second buck module and the switch T2, respectively.
The invention further provides that the ballast-based dimming switch circuit further comprises a resistor R2, a resistor R3 and a triode T3; the control module comprises a control chip U2; the PWM end of the control chip U2 is connected with the base electrode of the triode T3 through a resistor R2; the emitter of the triode T3 is grounded; the collector of the triode T3 is connected with one end of a resistor R3; the other end of the resistor R3 is connected with an emitting electrode of a triode T1; the collector of the triode T3 is connected with the control end of the switch tube T2.
The invention further provides that the ballast-based dimming switching circuit further comprises a diode D3; the switch tube T2 is an MOS tube; the source electrode of the MOS tube is grounded; the drain electrode of the MOS tube is respectively connected with a freewheeling diode D2 and a filter capacitor E2; the grid electrode of the MOS tube is connected with the collector electrode of a triode T3; the anode of the diode D3 is connected with the source electrode of the MOS tube; and the cathode of the diode D3 is connected with the drain of the MOS tube.
The invention is further configured that the second buck module comprises a buck chip U3, an inductor E1 and an inductor C2; the input end of the voltage reduction chip U3 is grounded through an inductor E1; the output end of the voltage reduction chip U3 is grounded through an inductor C2; the input end of the voltage reduction chip U3 is connected with the emitter of the triode T1; the output end of the voltage reduction chip U3 is connected with the power supply end of the control module.
The invention is further provided that the sampling module comprises a resistor R4 and a resistor R5; one end of the resistor R4 is connected with the output end of the rectifying module; the other end of the resistor R4 is grounded through a resistor R5; the other end of the resistor R4 is connected with the sampling end of the control chip U2.
The invention is further configured such that the ballast-based dimmer switch circuit further comprises a switch detection module; the switch detection module is connected with the control module;
the switch detection module comprises a diode D4, a resistor R7, a resistor R8, a triode T4 and a resistor R6; one end of the resistor R7 is connected with the anode of the diode D4; the cathode of the diode D4 is connected with the output end of the rectifying module; the other end of the resistor R7 is grounded through a resistor R8; the other end of the resistor R7 is connected with the base electrode of the triode T4; the emitter of the triode T4 is grounded; the collector of the triode T4 is connected with the output end of the second voltage reduction module through a resistor R6; and the collector of the triode T4 is connected with the output end of the control module.
The invention is further provided that the input end of the control chip U2 is connected with a switch K1.
A dimming method based on a ballast comprises a rectifying module, a first voltage reduction module, a second voltage reduction module, a sampling module, a control module, an energy storage inductor L1, a freewheeling diode D2, a filter capacitor E2 and a switching tube T2; the ballast-based dimming method comprises the following steps:
a rectification step: rectifying the voltage output by the ballast into direct-current voltage through a rectifying module;
a first step of reducing pressure: the direct-current voltage is reduced through the first voltage reduction module, and a driving voltage is provided for the switching tube T2;
a second step of reducing pressure: the voltage output by the first voltage reduction module is reduced through the second voltage reduction module, and the voltage is provided for the control module;
a sampling step: the control module collects the direct-current voltage output by the rectification module through the sampling module;
PWM control step: the control module outputs a PWM signal to a switching tube T2; the switching tube T2 is switched on and off according to the duty ratio of the PWM signal, so that the direct-current voltage output by the collecting and rectifying module is changed through the energy storage inductor L1, the freewheeling diode D2 and the filter capacitor E2;
fine adjustment: the control module compares the collected direct-current voltage output by the rectifying module with a preset voltage value so as to adjust the duty ratio of the PWM signal output to the switching tube T2.
The invention has the beneficial effects that: the invention achieves the purpose of adjusting the output voltage of the ballast by controlling the PWM duty ratio through the control module, and simultaneously adjusts the PWM duty ratio by detecting the voltage output by the ballast, so that the output voltage of each grade of ballast keeps accurate, thereby achieving the purpose of dimming.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be derived on the basis of the following drawings without inventive effort.
FIG. 1 is a circuit diagram of the present invention;
FIG. 2 is a circuit diagram of the control module and sampling module combination of the present invention;
fig. 3 is a circuit diagram of the switch detect module of the present invention.
Detailed Description
The invention is further described with reference to the following examples.
As can be seen from fig. 1 to 3; the dimming switch circuit based on the ballast comprises a rectifying module, a first voltage-reducing module, a second voltage-reducing module, a sampling module, a control module, an energy storage inductor L1, a freewheeling diode D2, a filter capacitor E2 and a switching tube T2;
the input end of the rectifying module is connected with the ballast; the first voltage reduction module is connected with the output end of the rectification module and is used for providing driving voltage for the switching tube T2; the second voltage reduction module is used for supplying power to the control module; the control end of the switch tube T2 is connected with the control module; the control module is used for outputting a PWM signal to control the switch tube T2 to work; one end of the energy storage inductor L1 is connected with the output end of the rectifying module; the other end of the energy storage inductor L1 is connected with the switch end of a switch tube T2 through a filter capacitor E2; one end of the energy storage inductor L1 is connected with the switch end of the switch tube T2 through a freewheeling diode D2;
and the output end of the rectification module is connected with the control module through the sampling module.
Specifically, in the conventional lamp tube of the LED switch circuit based on the ballast, since the on-state voltage of the LED lamp bead is basically a fixed value, and the output current of the ballast can also be regarded as an approximately constant current, the output power of the conventional lamp tube of the LED switch circuit based on the ballast is also a fixed value, and the brightness of the lamp tube cannot be adjusted;
in the dimming switch circuit based on the ballast according to the embodiment, firstly, the voltage output by the ballast is rectified into the direct-current voltage through the rectifying module, then, the direct-current voltage is reduced through the first voltage reduction module and provides the driving voltage for the switching tube T2, and the voltage output by the first voltage reduction module is reduced through the second voltage reduction module and provides the voltage for the control module; when the power of the lamp tube needs to be changed, the control module sends PWM signals with different duty ratios to the switch tube T2 so as to drive the switch tube T2, and the magnitude of the direct-current voltage output by the rectifying module is changed by utilizing the energy storage of the energy storage inductor L1, the energy storage of the freewheeling diode D2 and the filtering action of the filter capacitor E2; in addition, the control module collects the direct-current voltage output by the rectifying module through the sampling module, and the control module compares the collected direct-current voltage output by the rectifying module with a preset voltage value so as to adjust the duty ratio of a PWM signal output to the switching tube T2 and keep the direct-current voltage of each gear accurate; because the output current of the ballast can also be regarded as an approximate constant current, the output power of the lamp tube can be changed by changing the size of the direct-current voltage output by the rectifying module, so that the dimming effect is achieved, when the series voltage of the LED lamp beads is 36V, the direct-current voltage output by the rectifying module can be changed between 36V and 180V, and the output power has a large adjusting range.
In the dimming switch circuit based on the ballast according to this embodiment, the rectifier module includes a rectifier bridge BR 1; two input ends of the rectifier bridge BR1 are respectively connected with the ballast; the negative output end of the rectifier bridge BR1 is grounded; the positive output end of the rectifier bridge BR1 is respectively connected with one end of the energy storage inductor L1, the first voltage reduction module and the sampling module; and a capacitor C1 is arranged between the positive output end of the rectifier bridge BR1 and the negative output end of the rectifier bridge BR 1. The alternating voltage output by the ballast can be effectively rectified into rectified voltage by arranging the rectifier bridge BR1, and the direct voltage output by the rectifier bridge BR1 can be filtered by the capacitor C1.
In the dimming switch circuit based on a ballast according to this embodiment, the first voltage-reducing module includes a transistor T1, a voltage regulator D1, and a resistor R1; one end of the resistor R1 is connected with the output end of the rectifying module; the other end of the resistor R1 is connected with the base electrode of the triode T1; the collector of the triode T1 is connected with one end of a resistor R1; the base electrode of the triode T1 is connected with the negative electrode of a voltage regulator tube D1; the anode of the voltage regulator tube D1 is grounded; the emitter of the triode T1 is connected to the second buck module and the switch T2, respectively. With the above arrangement, the dc voltage output from the rectifier bridge BR1 can be efficiently converted into a 12V voltage as the driving voltage of the switching tube T2.
In the ballast-based dimming switch circuit of this embodiment, the ballast-based dimming switch circuit further includes a resistor R2, a resistor R3, and a transistor T3; the control module comprises a control chip U2; the PWM end of the control chip U2 is connected with the base electrode of the triode T3 through a resistor R2; the emitter of the triode T3 is grounded; the collector of the triode T3 is connected with one end of a resistor R3; the other end of the resistor R3 is connected with an emitting electrode of a triode T1; the collector of the triode T3 is connected with the control end of the switch tube T2. The control chip U2 is a single chip microcomputer capable of outputting PWM signals, such as CH 549. Through the arrangement, the control module can send PWM signals with different duty ratios to the switch tube T2 so as to drive the switch tube T2.
In the ballast-based dimming switch circuit of this embodiment, the ballast-based dimming switch circuit further includes a diode D3; the switch tube T2 is an MOS tube; the source electrode of the MOS tube is grounded; the drain electrode of the MOS tube is respectively connected with a freewheeling diode D2 and a filter capacitor E2; the grid electrode of the MOS tube is connected with the collector electrode of a triode T3; the anode of the diode D3 is connected with the source electrode of the MOS tube; and the cathode of the diode D3 is connected with the drain of the MOS tube.
In the dimming switch circuit based on a ballast according to this embodiment, the second voltage-reducing module includes a voltage-reducing chip U3, an inductor E1, and an inductor C2; the input end of the voltage reduction chip U3 is grounded through an inductor E1; the output end of the voltage reduction chip U3 is grounded through an inductor C2; the input end of the voltage reduction chip U3 is connected with the emitter of the triode T1; the output end of the voltage reduction chip U3 is connected with the power supply end of the control module. The model number of the chip U3 is 78L 05; the arrangement can effectively convert the 12V voltage output by the first voltage reduction module into 5V voltage to supply power to the control module.
In the ballast-based dimming switch circuit according to this embodiment, the sampling module includes a resistor R4 and a resistor R5; one end of the resistor R4 is connected with the output end of the rectifying module; the other end of the resistor R4 is grounded through a resistor R5; the other end of the resistor R4 is connected with the sampling end of the control chip U2. The voltage division is realized by arranging the resistor R4 and the resistor R5 so as to collect the data for the control chip U2.
In the dimming switch circuit based on the ballast according to this embodiment, the dimming switch circuit based on the ballast further includes a switch detection module; the switch detection module is connected with the control module;
the switch detection module comprises a diode D4, a resistor R7, a resistor R8, a triode T4 and a resistor R6; one end of the resistor R7 is connected with the anode of the diode D4; the cathode of the diode D4 is connected with the output end of the rectifying module; the other end of the resistor R7 is grounded through a resistor R8; the other end of the resistor R7 is connected with the base electrode of the triode T4; the emitter of the triode T4 is grounded; the collector of the triode T4 is connected with the output end of the second voltage reduction module through a resistor R6; and the collector of the triode T4 is connected with the output end of the control module. In the dimming switch circuit based on the ballast according to this embodiment, the input end of the control chip U2 is connected to the switch K1.
Specifically, the dimming switch circuit based on the ballast according to this embodiment is configured with the switch detection module, so that the control module can select the PWM signals with different duty ratios to control the power of the lamp according to the switching times and time of the user, and in addition, the user can wirelessly control the lamp to operate through the wireless module.
The dimming method based on the ballast comprises a rectifying module, a first voltage-reducing module, a second voltage-reducing module, a sampling module, a control module, an energy storage inductor L1, a freewheeling diode D2, a filter capacitor E2 and a switching tube T2; the ballast-based dimming method comprises the following steps:
a rectification step: rectifying the voltage output by the ballast into direct-current voltage through a rectifying module;
a first step of reducing pressure: the direct-current voltage is reduced through the first voltage reduction module, and a driving voltage is provided for the switching tube T2;
a second step of reducing pressure: the voltage output by the first voltage reduction module is reduced through the second voltage reduction module, and the voltage is provided for the control module;
a sampling step: the control module collects the direct-current voltage output by the rectification module through the sampling module;
PWM control step: the control module outputs a PWM signal to a switching tube T2; the switching tube T2 is switched on and off according to the duty ratio of the PWM signal, so that the direct-current voltage output by the collecting and rectifying module is changed through the energy storage inductor L1, the freewheeling diode D2 and the filter capacitor E2;
fine adjustment: the control module compares the collected direct-current voltage output by the rectifying module with a preset voltage value so as to adjust the duty ratio of the PWM signal output to the switching tube T2.
In the dimming method based on the ballast, the purpose of adjusting the output voltage of the ballast is achieved by controlling the PWM duty ratio through the control module, and the PWM duty ratio is adjusted by detecting the voltage output by the ballast, so that the output voltage of the ballast at each level is kept accurate, thereby achieving the purpose of dimming.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A ballast-based dimmer switch circuit, comprising: the circuit comprises a rectifying module, a first voltage-reducing module, a second voltage-reducing module, a sampling module, a control module, an energy storage inductor L1, a freewheeling diode D2, a filter capacitor E2 and a switch tube T2;
the input end of the rectifying module is connected with the ballast; the first voltage reduction module is connected with the output end of the rectification module and is used for providing driving voltage for the switching tube T2; the second voltage reduction module is used for supplying power to the control module; the control end of the switch tube T2 is connected with the control module; the control module is used for outputting a PWM signal to control the switch tube T2 to work; one end of the energy storage inductor L1 is connected with the output end of the rectifying module; the other end of the energy storage inductor L1 is connected with the switch end of a switch tube T2 through a filter capacitor E2; one end of the energy storage inductor L1 is connected with the switch end of the switch tube T2 through a freewheeling diode D2;
and the output end of the rectification module is connected with the control module through the sampling module.
2. A ballast-based dimmer switching circuit as claimed in claim 1, wherein: the rectifier module comprises a rectifier bridge BR 1; two input ends of the rectifier bridge BR1 are respectively connected with the ballast; the negative output end of the rectifier bridge BR1 is grounded; the positive output end of the rectifier bridge BR1 is respectively connected with one end of the energy storage inductor L1, the first voltage reduction module and the sampling module; and a capacitor C1 is arranged between the positive output end of the rectifier bridge BR1 and the negative output end of the rectifier bridge BR 1.
3. A ballast-based dimmer switching circuit as claimed in claim 1, wherein: the first voltage reduction module comprises a triode T1, a voltage regulator tube D1 and a resistor R1; one end of the resistor R1 is connected with the output end of the rectifying module; the other end of the resistor R1 is connected with the base electrode of the triode T1; the collector of the triode T1 is connected with one end of a resistor R1; the base electrode of the triode T1 is connected with the negative electrode of a voltage regulator tube D1; the anode of the voltage regulator tube D1 is grounded; the emitter of the triode T1 is connected to the second buck module and the switch T2, respectively.
4. A ballast-based dimmer switching circuit as claimed in claim 3, wherein: the ballast-based dimming switch circuit further comprises a resistor R2, a resistor R3, and a transistor T3; the control module comprises a control chip U2; the PWM end of the control chip U2 is connected with the base electrode of the triode T3 through a resistor R2; the emitter of the triode T3 is grounded; the collector of the triode T3 is connected with one end of a resistor R3; the other end of the resistor R3 is connected with an emitting electrode of a triode T1; the collector of the triode T3 is connected with the control end of the switch tube T2.
5. A ballast-based dimmer switching circuit as claimed in claim 4, wherein: the ballast-based dimming switching circuit further comprises a diode D3; the switch tube T2 is an MOS tube; the source electrode of the MOS tube is grounded; the drain electrode of the MOS tube is respectively connected with a freewheeling diode D2 and a filter capacitor E2; the grid electrode of the MOS tube is connected with the collector electrode of a triode T3; the anode of the diode D3 is connected with the source electrode of the MOS tube; and the cathode of the diode D3 is connected with the drain of the MOS tube.
6. A ballast-based dimmer switching circuit as claimed in claim 3, wherein: the second buck module comprises a buck chip U3, an inductor E1 and an inductor C2; the input end of the voltage reduction chip U3 is grounded through an inductor E1; the output end of the voltage reduction chip U3 is grounded through an inductor C2; the input end of the voltage reduction chip U3 is connected with the emitter of the triode T1; the output end of the voltage reduction chip U3 is connected with the power supply end of the control module.
7. A ballast-based dimmer switching circuit as claimed in claim 4, wherein: the sampling module comprises a resistor R4 and a resistor R5; one end of the resistor R4 is connected with the output end of the rectifying module; the other end of the resistor R4 is grounded through a resistor R5; the other end of the resistor R4 is connected with the sampling end of the control chip U2.
8. A ballast-based dimmer switching circuit as claimed in claim 1, wherein: the ballast-based dimming switching circuit further comprises a switch detection module; the switch detection module is connected with the control module;
the switch detection module comprises a diode D4, a resistor R7, a resistor R8, a triode T4 and a resistor R6; one end of the resistor R7 is connected with the anode of the diode D4; the cathode of the diode D4 is connected with the output end of the rectifying module; the other end of the resistor R7 is grounded through a resistor R8; the other end of the resistor R7 is connected with the base electrode of the triode T4; the emitter of the triode T4 is grounded; the collector of the triode T4 is connected with the output end of the second voltage reduction module through a resistor R6; and the collector of the triode T4 is connected with the output end of the control module.
9. A ballast-based dimmer switching circuit as claimed in claim 4, wherein: the input end of the control chip U2 is connected with a switch K1.
10. A ballast-based dimming method, characterized by: the circuit comprises a rectifying module, a first voltage-reducing module, a second voltage-reducing module, a sampling module, a control module, an energy storage inductor L1, a freewheeling diode D2, a filter capacitor E2 and a switch tube T2; the ballast-based dimming method comprises the following steps:
a rectification step: rectifying the voltage output by the ballast into direct-current voltage through a rectifying module;
a first step of reducing pressure: the direct-current voltage is reduced through the first voltage reduction module, and a driving voltage is provided for the switching tube T2;
a second step of reducing pressure: the voltage output by the first voltage reduction module is reduced through the second voltage reduction module, and the voltage is provided for the control module;
a sampling step: the control module collects the direct-current voltage output by the rectification module through the sampling module;
PWM control step: the control module outputs a PWM signal to a switching tube T2; the switching tube T2 is switched on and off according to the duty ratio of the PWM signal, so that the direct-current voltage output by the collecting and rectifying module is changed through the energy storage inductor L1, the freewheeling diode D2 and the filter capacitor E2;
fine adjustment: the control module compares the collected direct-current voltage output by the rectifying module with a preset voltage value so as to adjust the duty ratio of the PWM signal output to the switching tube T2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010176587.7A CN111225473A (en) | 2020-03-13 | 2020-03-13 | Dimming switch circuit and dimming method based on ballast |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010176587.7A CN111225473A (en) | 2020-03-13 | 2020-03-13 | Dimming switch circuit and dimming method based on ballast |
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| CN111225473A true CN111225473A (en) | 2020-06-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112399672A (en) * | 2020-11-02 | 2021-02-23 | 厦门市义圆源科技有限公司 | Dimming lamp tube compatible with electronic ballast |
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2020
- 2020-03-13 CN CN202010176587.7A patent/CN111225473A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112399672A (en) * | 2020-11-02 | 2021-02-23 | 厦门市义圆源科技有限公司 | Dimming lamp tube compatible with electronic ballast |
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