CN112616223A - Silicon controlled rectifier dimming power supply and filter circuit thereof - Google Patents
Silicon controlled rectifier dimming power supply and filter circuit thereof Download PDFInfo
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- CN112616223A CN112616223A CN202011637868.4A CN202011637868A CN112616223A CN 112616223 A CN112616223 A CN 112616223A CN 202011637868 A CN202011637868 A CN 202011637868A CN 112616223 A CN112616223 A CN 112616223A
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- power supply
- filter circuit
- mode inductor
- inductor
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from AC input or output
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention provides a silicon controlled rectifier dimming power supply and a filter circuit thereof, wherein the filter circuit comprises a primary common mode inductor, the output end of the primary common mode inductor is connected with a filter module, the output end of the filter module is connected with a secondary common mode inductor, and the output end of the secondary common mode inductor is connected with a rectifying circuit; the filter module comprises a ring inductor, and the ring inductor is made of iron-silicon-aluminum materials. The silicon controlled rectifier dimming power supply is provided with a silicon controlled rectifier power supply management circuit and the filter circuit. The invention can effectively avoid the situations of dimming flicker and noise generation in the dimming process of the silicon controlled intelligent lamp.
Description
Technical Field
The invention relates to the field of control of intelligent lamps, in particular to a filter circuit of a silicon controlled rectifier dimming power supply and the silicon controlled rectifier dimming power supply with the filter circuit.
Background
Along with the development of intelligent home technology, the current household appliances are more and more intelligent, and the intelligent lamp is a common intelligent appliance. Most of the existing intelligent lamps use LED chips and silicon controlled dimming power supplies which are provided with a silicon controlled power management circuit and a filter circuit.
In recent years, with the development of intelligent lamp technology, the requirements of silicon controlled rectifier dimming power supplies are higher and higher, and the requirements of compatibility of various silicon controlled rectifiers and EMI (electromagnetic interference) resistance of products are both met. Therefore, the filter circuit of the silicon controlled rectifier dimming power supply is mainly used for filtering electromagnetic interference signals. The filter circuit commonly used at present mainly uses a common mode inductor to suppress common mode signal interference, and uses an X capacitor or an I-shaped inductor to suppress differential mode signal interference. The X capacitor is a capacitor for suppressing electromagnetic interference of a power supply, and generally has a main function in a circuit to realize EMI filtering, spark elimination, and the like.
Referring to fig. 1, the existing filter circuit for the scr dimming power supply receives an electrical signal output by the scr dimmer after chopping, the electrical signal is input to a first-stage common mode inductor LF1 through a fuse F1, and then enters a PI type filter module, the filter module includes a capacitor CX1, a common mode inductor LF2 and a capacitor CX2, wherein the capacitors CX1 and CX2 are both X capacitors. After the signal output by the PI type filter module passes through the rectifier circuit DB1, the signal is output after the interference of the differential mode signal is suppressed through the differential mode inductor L1. Capacitors, for example, filter capacitors C1 and C2, are connected to both ends of the differential mode inductor L1.
When the thyristor dimmer is switched on, alternating current is almost simultaneously applied to an LC input filter rectifying circuit at the front stage of a power supply, and the voltage applied to an inductor can cause the voltage on capacitors C1 and C2 and X capacitors CX1 and CX2 to oscillate, so that the thyristor dimmer is restarted, and the intelligent lamp generates dimming flicker and generates noise.
Disclosure of Invention
The invention aims to provide a filter circuit for effectively preventing a silicon controlled intelligent lamp from dimming flicker and generating noise.
The second purpose of the invention is to provide a silicon controlled rectifier dimming power supply applying the filter circuit.
In order to achieve the first purpose of the invention, the filter circuit of the silicon controlled rectifier dimming power supply comprises a first-stage common-mode inductor, wherein the output end of the first-stage common-mode inductor is connected with a filter module, the output end of the filter module is connected with a second-stage common-mode inductor, and the output end of the second-stage common-mode inductor is connected with a rectifying circuit; the filter module comprises a ring inductor, and the ring inductor is made of iron-silicon-aluminum materials.
According to the scheme, the annular inductor is made of the iron-silicon-aluminum material, the annular magnetic core is used for reducing the inductance vibration, the iron-silicon-aluminum material magnetic core has the magnetostriction coefficient performance close to zero, and the noise generated by the filter circuit can be reduced. Therefore, the annular inductor made of iron-silicon-aluminum materials replaces an X capacitor, the capacitance value of the filter circuit can be reduced, the oscillation condition of the filter circuit is reduced, the conditions that the intelligent lamp flickers and generates noise in the dimming process can be effectively avoided, and the performance requirement for resisting electromagnetic interference can be met.
Preferably, the number of the ring inductors is two, the two ring inductors are connected in parallel, and each ring inductor is connected in parallel with the resistor.
Therefore, the working stability of the filter circuit can be improved by using the two symmetrical annular inductors.
The further scheme is that the output end of the rectifying circuit is also connected with a differential mode inductor, and two ends of the differential mode inductor are both connected with filter capacitors.
Therefore, the differential mode signals can be restrained through the differential mode inductor and the filter capacitor, so that the filter circuit meets the performance requirement of anti-electromagnetic interference.
In a further scheme, an X capacitor is connected between the output end of the secondary common mode inductor and the rectifying circuit.
Therefore, the electromagnetic interference signals can be further inhibited through the X capacitor, so that the filter circuit meets the performance requirement of anti-electromagnetic interference.
According to a further scheme, a first input end of the primary common mode inductor is connected with a fuse, a second input end of the primary common mode inductor is connected with a thermistor, and the thermistor is a thermistor with a negative temperature coefficient.
In order to achieve the second objective, the thyristor light-adjusting power supply provided by the invention comprises a thyristor power supply management circuit and the filter circuit, wherein the thyristor light adjuster outputs chopped electrical signals to the thyristor light-adjusting power supply, the chopped electrical signals pass through the filter circuit and then are processed by the thyristor power supply management circuit, and then the electrical signals supply power to the LED chip.
Drawings
Fig. 1 is an electrical schematic diagram of a filter circuit of a conventional scr dimming power supply.
Fig. 2 is a block diagram of the thyristor dimmer power supply according to the embodiment of the invention, and the thyristor dimmer and the LED chip.
Fig. 3 is an electrical schematic diagram of a filter circuit of the scr dimming power supply of the present invention.
The invention is further explained with reference to the drawings and the embodiments.
Detailed Description
The silicon controlled rectifier dimming power supply is applied to an intelligent lamp, an LED chip is arranged in the intelligent lamp, and the silicon controlled rectifier dimming power supply supplies power to the LED chip and adjusts the brightness of the LED chip.
Silicon controlled rectifier power supply embodiment:
referring to fig. 1, the present embodiment includes a filter circuit 12 and a scr power management circuit 13, the commercial power is chopped by the scr dimmer 11 through its internal circuit, and outputs the chopped electrical signal to the scr dimming power supply 20, the electrical signal output by the scr dimmer 11 is received by the filter circuit 12, and the filter circuit 12 filters the electrical signal output by the scr dimmer 11, especially filters an electromagnetic interference signal, so as to avoid the electromagnetic interference signal from interfering with the LED chip 14 and other electronic devices. The signal output by the filter circuit 12 is processed by the silicon controlled power management circuit 13 and then output to the LED chip 14.
The embodiment of the filter circuit of the silicon controlled rectifier dimming power supply comprises the following steps:
referring to fig. 3, the filter circuit 12 receives the ac mains and has 2 input terminals, a primary common mode inductor LF11 is disposed in the filter circuit 12, one input terminal of the primary common mode inductor LF11 is connected to a fuse F11, and the fuse F11 is connected between the live line L and one input terminal of the primary common mode inductor LF 11. When the alternating current is too large, the fuse F11 will be blown, so as to prevent the filter circuit from being impacted by large current. The other input end of the primary common mode inductor LF11 is connected with a thermistor NTC11, and the thermistor NTC11 is a negative temperature coefficient thermistor. The thermistor NTC11 is connected between the zero line N and the input end of the primary common mode inductor LF 11.
A filter module is arranged at the output end of the primary common mode inductor LF11, the filter module of this embodiment includes two parallel-connected loop inductors L12, L13, and preferably, the loop inductors L12, L13 are loop inductors made of iron-silicon-aluminum material. One end of the loop inductor L12 is connected to one output end of the primary common-mode inductor LF11, and one end of the loop inductor L13 is connected to the other output end of the primary common-mode inductor LF 11. And each annular inductor is connected with a resistor in parallel. Specifically, the annular inductor L12 is connected in parallel with the resistor R11, and the annular inductor L13 is connected in parallel with the resistor R12.
The output end of the filtering module is connected with a secondary common-mode inductor LF12, one input end of a secondary common-mode inductor LF12 is connected to one end of the annular inductor L12, and the other input end of the secondary common-mode inductor LF12 is connected to one end of the annular inductor L13.
The output end of the secondary common mode inductor LF12 is provided with a rectifying circuit DB11, and in this embodiment, the rectifying circuit DB11 is a full bridge rectifying circuit. In addition, an X capacitor CX12 is further provided between the output terminal of the second-stage common mode inductor LF12 and the rectifier circuit DB11, and specifically, the X capacitor CX12 is provided between two output terminals of the second-stage common mode inductor LF 12.
The output end of the rectifier circuit DB11 is further provided with a differential mode inductor L11, and two ends of the differential mode inductor L11 are respectively connected with a filter capacitor, for example, a filter capacitor C11 is connected between the rectifier circuit DB11 and one end of the differential mode inductor L11, and the other end of the differential mode inductor L11 is used as the output end and is connected with a filter capacitor C12.
Alternating current commercial power passes through the silicon controlled dimmer 11, an electric signal output after chopping processing is carried out by the silicon controlled dimmer 11 is received by the filter circuit 12, the electric signal firstly passes through the fuse F11 and then passes through the primary common mode inductor LF11, and voltage output by the primary common mode inductor LF11 is output to the secondary common mode inductor LF12 after passing through annular inductors L12 and L13 made of iron-silicon-aluminum materials, is output to the differential mode inductor L11 after being rectified, and is output after being filtered.
Since this embodiment does not provide a PI type filter module composed of 2X capacitors and a common mode inductor, the PI type filter module is replaced by annular inductors L12 and L13 made of sendust material. The embodiment reduces the vibration of the toroidal inductors L12 and L13 by using the toroidal magnetic core of the toroidal inductor, and can reduce the noise generated by the filter circuit by using the performance that the magnetic core made of the sendust material has the magnetostriction coefficient close to zero. In addition, in the embodiment, the ring inductors L12 and L13 made of iron-silicon-aluminum materials are used to replace an X capacitor in a traditional filter circuit, so that the capacitance value of the filter circuit can be reduced, and the oscillation of the filter circuit is reduced, therefore, after the signal output by the silicon controlled dimmer 11 passes through the filter circuit 12, the silicon controlled intelligent lamp is not easy to flicker in the dimming process, and the noise in the working process of the silicon controlled intelligent lamp is reduced.
Moreover, the filter circuit of the embodiment does not affect the original dimming compatibility of the silicon controlled rectifier dimming power supply, does not flicker or generate noise in the dimming process, can also meet the performance requirement of anti-electromagnetic interference, and meets the use requirement of the silicon controlled rectifier intelligent lamp.
Finally, it should be emphasized that the present invention is not limited to the above-described embodiments, such as the change of the number of ring inductors used, or the change of the types of common mode inductors and differential mode inductors, etc., which are also included in the protection scope of the present invention.
Claims (10)
1. A filter circuit for a thyristor-regulated power supply, comprising:
the output end of the first-stage common mode inductor is connected with a filtering module, the output end of the filtering module is connected with a second-stage common mode inductor, and the output end of the second-stage common mode inductor is connected with a rectifying circuit;
the method is characterized in that:
the filter module comprises a ring inductor, and the ring inductor is made of iron-silicon-aluminum materials.
2. The filter circuit of the triac dimmer power supply of claim 1, wherein:
the number of the annular inductors is two, and the two annular inductors are connected in parallel.
3. The filter circuit of the triac dimmer power supply of claim 2, wherein:
each annular inductor is connected with a resistor in parallel.
4. The filter circuit of the triac dimmer power supply according to any one of claims 1 to 3, wherein:
the output end of the rectifying circuit is also connected with a differential mode inductor.
5. The filter circuit of the triac dimmer power supply of claim 4, wherein:
and both ends of the differential mode inductor are connected with filter capacitors.
6. The filter circuit of the triac dimmer power supply according to any one of claims 1 to 3, wherein:
and an X capacitor is connected between the output end of the secondary common mode inductor and the rectifying circuit.
7. The filter circuit of the triac dimmer power supply according to any one of claims 1 to 3, wherein:
and a first input end of the primary common mode inductor is connected with a fuse.
8. The filter circuit of the triac dimmer power supply according to any one of claims 1 to 3, wherein:
and the second input end of the primary common mode inductor is connected with the thermistor.
9. The filter circuit of the triac dimmer power supply of claim 8, wherein:
the thermistor is a thermistor with a negative temperature coefficient.
10. A thyristor dimmable power supply comprising a thyristor power management circuit and a filter circuit as claimed in any of claims 1 to 9, the filter circuit outputting an electrical signal to the thyristor power management circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011637868.4A CN112616223A (en) | 2020-12-31 | 2020-12-31 | Silicon controlled rectifier dimming power supply and filter circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011637868.4A CN112616223A (en) | 2020-12-31 | 2020-12-31 | Silicon controlled rectifier dimming power supply and filter circuit thereof |
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| CN112616223A true CN112616223A (en) | 2021-04-06 |
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| CN202011637868.4A Pending CN112616223A (en) | 2020-12-31 | 2020-12-31 | Silicon controlled rectifier dimming power supply and filter circuit thereof |
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|---|---|---|---|---|
| CN2699624Y (en) * | 2004-03-05 | 2005-05-11 | 潘勇 | A high tubing pressure luminous tube ballasting device |
| US20200343034A1 (en) * | 2004-06-17 | 2020-10-29 | Hans Wennerstrom | High frequency inverter / distributed gap inductor – capacitor filter apparatus and method of use thereof |
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Application publication date: 20210406 |
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