CN210641109U - Constant-current electrodeless dimming driving circuit - Google Patents
Constant-current electrodeless dimming driving circuit Download PDFInfo
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- CN210641109U CN210641109U CN201921823670.8U CN201921823670U CN210641109U CN 210641109 U CN210641109 U CN 210641109U CN 201921823670 U CN201921823670 U CN 201921823670U CN 210641109 U CN210641109 U CN 210641109U
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Abstract
The utility model discloses a constant-current electrodeless dimming drive circuit, which relates to the electronic field and comprises a PFC rectification filter module, an IC power supply circuit, a rear-stage drive control IC, a constant-current conversion circuit and an output circuit, wherein the output end of the PFC rectification filter module is connected with the constant-current conversion circuit and used for realizing voltage stabilization output, and the constant-current conversion circuit is connected with the output circuit and used for adjusting voltage frequency and realizing no stroboflash of an LED; the LED constant current drive circuit comprises a PFC rectification filter module, a rear-stage drive control IC and a constant current conversion circuit which are sequentially connected, an IC power supply circuit comprises a dimming chip IC and a capacitor, one end of the capacitor is connected with a dimming end of the rear-stage drive control IC, the other end of the capacitor is connected with grounding ends of the PFC rectification filter module and the rear-stage drive control IC, and the dimming chip IC is connected with the dimming end of the rear-stage drive control IC and is used for achieving stepless regulation of an LED and integrating stepless dimming and light and no stroboflash of light to meet the requirements of the existing market.
Description
Technical Field
The invention relates to the field of electronics, in particular to a constant-current stepless dimming driving circuit.
Background
With the development of science and technology, electronic lighting sources such as Light Emitting Diode (LED) lamps and the like using electrical equivalent loads gradually replace traditional incandescent lamps to become lighting sources in daily life of people. At present, the current or voltage of a power supply can be adjusted by using an LED lamp dimmer, so that the LED lamp as a load generates light output with different intensities, but the dimming is step dimming, the dimming range is small, and the lighting requirements of different scenes are not met.
The traditional LED driving power supply generally only has a single function of high power factor or low power factor and constant current or constant voltage, completes constant current or constant voltage output, has single function, and cannot meet the development requirements of the current market.
Disclosure of Invention
The invention provides a constant-current stepless dimming driving circuit which can integrate stepless dimming and light non-stroboflash, expand the voltage adjusting range and meet the requirements of the existing market.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a constant-current stepless dimming drive circuit comprises a PFC rectification filter module, an IC power supply circuit, a post-stage drive control IC, a constant-current conversion circuit and an output circuit,
the output end of the PFC rectifying and filtering module is connected with the constant current conversion circuit and used for realizing voltage stabilization output, and the constant current conversion circuit is connected with the output circuit and used for adjusting voltage frequency and realizing no stroboscopic of the LED;
the LED constant current control circuit comprises a PFC rectification filter module, a rear-stage drive control IC and a constant current conversion circuit which are sequentially connected, wherein the IC power supply circuit comprises a dimming chip IC and a capacitor, one end of the capacitor is connected with a dimming end of the rear-stage drive control IC, the other end of the capacitor is connected with grounding ends of the PFC rectification filter module and the rear-stage drive control IC, and the dimming chip IC is connected with the dimming end of the rear-stage drive control IC and used for achieving electrodeless adjustment of an LED.
In one embodiment, the constant current conversion circuit includes a parallel resistor and a constant current inductor, the parallel resistor includes at least two resistors connected in parallel, two ends of the parallel resistor are respectively connected to the current sampling end and the power input end of the rear-stage drive control IC, one end of the constant current inductor is connected to the drain of the power switch of the rear-stage drive control IC, and the other end of the constant current inductor is connected to the output circuit.
In one embodiment, the output circuit includes an output rectifying and filtering circuit and an output load circuit, the output rectifying and filtering circuit includes an output rectifying diode and an output rectifying capacitor, an input end of the output rectifying diode is connected to a drain of the power switch of the rear-stage drive control IC, the other end of the output rectifying diode is connected to an output end of the PFC rectifying and filtering module, the output rectifying capacitor is connected to the output load circuit, and an anode of the output rectifying capacitor is further connected to a current sampling end of the rear-stage drive control IC.
In one embodiment, the output load circuit includes a common mode inductor, an input end of the common mode inductor is connected to the output rectifying capacitor, and an output end of the common mode inductor is provided with a load terminal.
In one embodiment, the PFC rectifier filter module comprises an input rectifier filter circuit, a start-up circuit, a driving control IC, a power switch tube, a transformer magnetic conversion circuit, and a secondary rectifier filter circuit, wherein,
the output end of the input rectification filter circuit is connected to the input end of the transformer magnetic conversion circuit, and the output end of the transformer magnetic conversion circuit is connected to the secondary rectification filter circuit;
the output end of the input rectifying and filtering circuit is connected with the drive control IC through the starting circuit, and the drive control IC is connected with the transformer magnetic conversion circuit through the power switch tube.
In one embodiment, a current sampling circuit is connected to an input end of the drive control IC, and an input end of the current sampling circuit is connected to the power switch tube and is used for detecting a current change of the power switch tube.
In one embodiment, the input end of the drive control IC is further connected to a voltage sampling circuit, and the input end of the voltage sampling circuit is connected to the transformer magnetic conversion circuit and is used for detecting a voltage change of the transformer magnetic conversion circuit.
In one embodiment, the start-up circuit includes a first resistor, a second resistor, a capacitor, and a parasitic diode, the first resistor and the second resistor are connected in series to a D-pole of the parasitic diode, and an S-pole of the parasitic diode is connected to the driving control IC and the capacitor.
In one embodiment, the current sampling circuit includes three parallel circuits and a third resistor, which are connected in parallel and have the same resistance, one end of the parallel circuit is connected in series with the third resistor and then connected to the current feedback input end of the drive control IC, and the other end of the parallel circuit is connected to the source electrode of the power switch tube.
In one embodiment, the voltage sampling circuit includes a first voltage sampling resistor, a second voltage sampling resistor and a capacitor, the first voltage sampling resistor and the capacitor are connected in parallel, one end of the first voltage sampling resistor is grounded, the other end of the first voltage sampling resistor is respectively connected to the voltage feedback input end of the drive control IC and one end of the second voltage sampling resistor, and the other end of the second voltage sampling resistor is connected to an auxiliary coil provided in the transformer magnetic conversion circuit.
The invention has the beneficial effects that:
the LED constant-current dimming circuit has the advantages that due to the fact that the PFC rectifying and filtering module, the IC power supply circuit, the rear-stage driving control IC, the constant-current conversion circuit and the output circuit are arranged, more extensive stepless dimming and light non-stroboflash are integrated, and requirements of an existing market are met.
And the PFC rectification filtering module comprises a drive control IC, the drive control IC is provided with a voltage sampling circuit for detecting voltage change, and the frequency of the control circuit realizes voltage stabilization output.
And the PFC rectifying and filtering module is of a single-stage PFC structure, and the manufacturing cost is saved while the function is realized by connecting the single-stage PFC with a DC/DC circuit.
Drawings
Fig. 1 is a schematic structural diagram of a constant-current electrodeless dimming driving circuit of the present invention;
fig. 2 is a schematic diagram of a specific circuit structure of the constant-current stepless dimming driving circuit shown in fig. 1;
fig. 3 is a schematic diagram of a circuit board structure of the constant-current stepless dimming driving circuit shown in fig. 1.
Detailed Description
The invention is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1-3, a constant current stepless dimming driving circuit includes a PFC rectifying filter module, an IC power supply circuit, a post-stage driving control IC2, a constant current conversion circuit and an output circuit, wherein an output terminal of the PFC rectifying filter module is connected to the constant current conversion circuit for realizing voltage stabilization output, and the constant current conversion circuit is connected to the output circuit for adjusting voltage frequency and realizing no stroboflash of an LED; the LED constant current control circuit comprises a PFC rectification filter module, a rear-stage drive control IC and a constant current conversion circuit which are sequentially connected, wherein the IC power supply circuit comprises a dimming chip IC (not shown in the figure) and a capacitor, one end of the capacitor is connected with a dimming end of the rear-stage drive control IC2, the other end of the capacitor is connected with grounding ends of the PFC rectification filter module and the rear-stage drive control IC, and the dimming chip IC is connected with a dimming end of the rear-stage drive control IC2 and used for achieving electrodeless regulation of an LED. In this embodiment, the IC2 is an integrated chip with model number PT 4115.
In this embodiment, the PFC rectifier and filter module includes an input rectifier and filter circuit, a start circuit, a driving control IC1, a power switching transistor Q2, a transformer magnetic conversion circuit, and a secondary rectifier and filter circuit, the input rectifier and filter circuit includes a plurality of elements such as a rectifier bridge, an inductor, and a capacitor, the input rectifier and filter circuit is connected to the start circuit, the start circuit includes a first resistor R6, a second resistor R5, a capacitor, and a parasitic diode, the first resistor and the second resistor are connected in series to a D pole of the parasitic diode, an S pole of the parasitic diode is connected to the driving control IC1 and the capacitor, the driving control IC1 is sent after voltage reduction by the start circuit, and the driving control IC1 starts to operate.
In this embodiment, the driving control IC1 is connected with a power supply circuit, the power supply circuit includes a diode D3, resistors R22 and R17, capacitors C2, C3 and C11, a power tube Q3 and a diode ZD1 connected in series, one end of the power supply circuit is connected with an auxiliary coil of the voltage transformer, and the other end of the power supply circuit is connected to a power input end of the driving control IC 1.
In this embodiment, the driving control IC1 is connected to a current sampling circuit, the current sampling circuit includes three parallel circuits and a third resistor R12, which are connected in parallel and have the same resistance, one end of the parallel circuit is connected to the third resistor R12 in series and then connected to the current feedback input end of the driving control IC1, and the other end of the parallel circuit is connected to the source of the power switch Q2, the current sampling circuit samples the change of the current in the power switch Q2 and compares the change with the current in the driving control IC1, so as to control the switching frequency in the driving control IC1 to realize the maximum current output.
In this embodiment, the driving control IC1 is connected with a voltage sampling circuit, the voltage sampling circuit includes a first voltage sampling resistor, a second voltage sampling resistor and a capacitor, the first voltage sampling resistor is connected in parallel with the capacitor, one end of the first voltage sampling resistor is grounded, the other end is connected to the voltage feedback input end of the driving control IC1 and one end of the second voltage sampling resistor, the other end of the second voltage sampling resistor is connected to the auxiliary coil provided in the transformer magnetic conversion circuit, the voltage change of the auxiliary winding of the transformer magnetic conversion circuit is sampled by the voltage sampling circuit to detect the load change information, and the switching frequency of the PWM is controlled by the internal voltage error of the driving control IC1 to realize stable voltage output.
In this embodiment, the power switch Q2 and the input rectifying and filtering circuit are both connected to the transformer magnetic converting circuit, and the output terminal of the transformer magnetic converting circuit is connected to the secondary rectifying and filtering circuit, so as to achieve a more stable voltage of the PFC rectifying and filtering module.
In this embodiment, the gate-level driving output terminal of the driving control IC1 is connected to the gate of the power switch Q2, the voltage feedback input terminal is connected to the auxiliary winding of the transformer magnetic conversion circuit through the voltage sampling circuit, the power input terminal is also connected to the auxiliary winding of the transformer through the power supply circuit, and the drain of the power switch Q2 is connected to the primary winding of the transformer magnetic conversion circuit.
In this embodiment, the constant current conversion circuit includes a parallel resistor and a constant current inductor L3, the parallel resistor (R19, R20) includes at least two resistors connected in parallel, two ends of the parallel resistor (R19, R20) are respectively connected to the current sampling end and the power input end of the rear-stage drive control IC2, one end of the constant current inductor L3 is connected to the power switch drain of the rear-stage drive control IC2, and the other end is connected to the output circuit, and in this embodiment, the parallel resistor (R19, R20) includes two resistors connected in parallel.
In this embodiment, the output circuit includes an output rectifying and filtering circuit and an output load circuit, the output rectifying and filtering circuit includes an output rectifying diode D5 and an output rectifying capacitor C11, an input terminal of the output rectifying diode D5 is connected to a drain of a power switch of the rear-stage driving control IC, the other terminal of the output rectifying diode D5 is connected to an output terminal of the PFC rectifying and filtering module, the output rectifying capacitor C11 is connected to the output load circuit, and an anode of the output rectifying and filtering circuit is further connected to a current sampling terminal of the rear-stage driving control IC.
In this embodiment, the output load circuit includes a common mode inductor L4, an input terminal of the common mode inductor L4 is connected to the output rectifying capacitor C11, and an output terminal thereof is provided with a load terminal.
Claims (10)
1. A constant-current stepless dimming driving circuit is characterized by comprising a PFC rectification filtering module, an IC power supply circuit, a post-stage driving control IC, a constant-current conversion circuit and an output circuit, wherein,
the output end of the PFC rectifying and filtering module is connected with the constant current conversion circuit and used for realizing voltage stabilization output, and the constant current conversion circuit is connected with the output circuit and used for adjusting voltage frequency and realizing no stroboscopic of the LED;
the LED constant current control circuit comprises a PFC rectification filter module, a rear-stage drive control IC and a constant current conversion circuit which are sequentially connected, wherein the IC power supply circuit comprises a dimming chip IC and a capacitor, one end of the capacitor is connected with a dimming end of the rear-stage drive control IC, the other end of the capacitor is connected with grounding ends of the PFC rectification filter module and the rear-stage drive control IC, and the dimming chip IC is connected with the dimming end of the rear-stage drive control IC and used for achieving electrodeless adjustment of an LED.
2. The constant-current electrodeless dimming driving circuit as claimed in claim 1, wherein the constant-current converting circuit comprises a parallel resistor and a constant-current inductor, the parallel resistor comprises at least two resistors connected in parallel, two ends of the parallel resistor are respectively connected to the current sampling end and the power input end of the rear-stage driving control IC, one end of the constant-current inductor is connected to the power switch drain of the rear-stage driving control IC, and the other end of the constant-current inductor is connected to the output circuit.
3. The constant-current electrodeless dimming driving circuit as claimed in claim 1, wherein the output circuit comprises an output rectifying and filtering circuit and an output load circuit, the output rectifying and filtering circuit comprises an output rectifying diode and an output rectifying capacitor, an input end of the output rectifying diode is connected to a drain electrode of the power switch of the rear-stage driving control IC, the other end of the output rectifying diode is connected to an output end of the PFC rectifying and filtering module, the output rectifying capacitor is connected with the output load circuit, and an anode of the output rectifying capacitor is further connected to a current sampling end of the rear-stage driving control IC.
4. The constant-current electrodeless dimming driving circuit as claimed in claim 3, wherein the output load circuit comprises a common-mode inductor, an input end of the common-mode inductor is connected to the output rectifying capacitor, and an output end of the common-mode inductor is provided with a load terminal.
5. The constant-current electrodeless dimming driving circuit as claimed in claim 1, wherein the PFC rectification filter module comprises an input rectification filter circuit, a starting circuit, a driving control IC, a power switch tube, a transformer magnetic conversion circuit and a secondary rectification filter circuit,
the output end of the input rectification filter circuit is connected to the input end of the transformer magnetic conversion circuit, and the output end of the transformer magnetic conversion circuit is connected to the secondary rectification filter circuit;
the output end of the input rectifying and filtering circuit is connected with the drive control IC through the starting circuit, and the drive control IC is connected with the transformer magnetic conversion circuit through the power switch tube.
6. The constant-current electrodeless dimming driving circuit as claimed in claim 5, wherein a current sampling circuit is connected to an input terminal of the driving control IC, and an input terminal of the current sampling circuit is connected to the power switch tube for detecting a current change of the power switch tube.
7. The constant-current electrodeless dimming driving circuit as claimed in claim 5, wherein a voltage sampling circuit is further connected to an input terminal of the driving control IC, and an input terminal of the voltage sampling circuit is connected to the transformer magnetic conversion circuit for detecting a voltage variation of the transformer magnetic conversion circuit.
8. The constant-current electrodeless dimming driving circuit as claimed in any one of claims 5 to 7, wherein the starting circuit comprises a first resistor, a second resistor, a capacitor and a parasitic diode, the first resistor and the second resistor are connected in series with the D pole of the parasitic diode, and the S pole of the parasitic diode is connected with the driving control IC and the capacitor.
9. The constant-current electrodeless dimming driving circuit as claimed in claim 6, wherein the current sampling circuit comprises three parallel circuits and a third resistor which are connected in parallel and have the same resistance, one end of the parallel circuit is connected in series with the third resistor and then connected to the current feedback input end of the driving control IC, and the other end of the parallel circuit is connected to a source electrode arranged on the power switch tube.
10. The constant-current electrodeless dimming driving circuit as claimed in claim 7, wherein the voltage sampling circuit comprises a first voltage sampling resistor, a second voltage sampling resistor and a capacitor, the first voltage sampling resistor and the capacitor are connected in parallel, one end of the first voltage sampling resistor is grounded, the other end of the first voltage sampling resistor is respectively connected to the voltage feedback input end of the driving control IC and one end of the second voltage sampling resistor, and the other end of the second voltage sampling resistor is connected to an auxiliary coil provided in the transformer magnetic conversion circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921823670.8U CN210641109U (en) | 2019-10-28 | 2019-10-28 | Constant-current electrodeless dimming driving circuit |
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| CN201921823670.8U CN210641109U (en) | 2019-10-28 | 2019-10-28 | Constant-current electrodeless dimming driving circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022021759A1 (en) * | 2020-07-27 | 2022-02-03 | 晨辉光宝科技股份有限公司 | Dimmable lighting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022021759A1 (en) * | 2020-07-27 | 2022-02-03 | 晨辉光宝科技股份有限公司 | Dimmable lighting device |
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