CN108601131B - TRIAC dimmer current maintaining circuit and linear dimming driving circuit using same - Google Patents
TRIAC dimmer current maintaining circuit and linear dimming driving circuit using same Download PDFInfo
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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]
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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]
- H05B45/10—Controlling the intensity of the light
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a TRIAC dimmer current maintenance circuit and a linear dimming driving circuit using the same, wherein the TRIAC dimmer current maintenance circuit is an RC circuit formed by connecting a first resistor and a first capacitor in series, and the RC circuit is connected with any rectifier diode in a rectifier bridge in the linear dimming driving circuit in parallel; the linear dimming driving circuit comprises an overcurrent protection circuit, a rectifier bridge formed by connecting four rectifier diodes, an RC circuit, an anti-surge circuit for absorbing high surge voltage in input voltage, a filter circuit, a linear constant current circuit and a stroboscopic removing circuit for removing stroboscopic generated by the asymmetry of LED load current caused by the RC circuit; the TRIAC dimmer current maintaining circuit has the advantages of simple structure, low cost, basically no consumption of electric energy, great improvement of the efficiency of the linear dimming driving circuit using the same, and no stroboscopic effect.
Description
Technical Field
The present invention relates to a linear power supply, and more particularly, to a TRIAC dimmer current maintaining circuit and a linear dimming driving circuit using the same.
Background
In conventional incandescent lamps, dimming is typically performed using a TRIAC (TRIAC) dimmer. Because incandescent lamps use a purely resistive filament, when current flows through the filament, the filament turns on to emit light, and the TRIAC dimmer always has current, requiring no additional current supply. As LED lighting gradually replaces incandescent lamps, TRIAC dimmers remain, but because LEDs are non-resistive dc driving devices, an LED driving power supply needs to be mounted to output dc power to the LEDs and keep constant current driving. The existing LED driving power supply is generally provided with a switching power supply and a linear power supply, and the switching power supply has an energy storage element, so that the maintenance current can be directly provided for the TRIAC dimmer, but the price of the switching power supply is higher; the linear power supply is low in price and simple in circuit and is gradually used for driving the LEDs, but the linear power supply can only flow current on the LED load when the input voltage is larger than the output voltage, so that the TRIAC dimmer is started, and when the input voltage is smaller than the output voltage, no current flows on the LED load, so that the TRIAC dimmer is turned off, and the LED lamp is caused to flash in the dimming process, so that a current maintaining circuit of the TRIAC dimmer is needed to be additionally arranged in the linear power supply.
The invention patent 'a stroboflash-free LED filament lamp' (patent number: ZL 201610833427.9) of China announced discloses a stroboflash-free LED filament lamp, which comprises a linear constant-current type driving power supply and an LED illuminant, wherein the driving power supply consists of an overcurrent protection unit, a rectification filter unit, a linear constant-current unit, a constant-current filter unit and a stroboflash removal unit for converting the output current of the constant-current filter unit into direct current without current ripple, the input end of the overcurrent protection unit is connected with the alternating current of the mains supply, the output end of the overcurrent protection unit is connected with the input end of the rectification filter unit, the output end of the rectification filter unit is connected with the input end of the linear constant-current unit, the output end of the constant-current filter unit is connected with the input end of the stroboflash removal unit, and the output end of the stroboflash removal unit is connected with the LED illuminant; the stroboflash-free LED filament lamp further comprises a dimmer, and a dimmer maintaining current providing unit connected with the dimmer is connected between the output end of the rectifying and filtering unit and the input end of the linear constant current unit. The driving power supply is a linear power supply, a dimmer maintaining current providing unit is arranged in the driving power supply, the dimmer maintaining current providing unit provides two parts of current for the dimmer, the circuit of the dimmer maintaining current providing unit is complex, components and parts are more, the cost is higher, and the circuit loss is large, so that the efficiency of the whole driving power supply is lower.
Disclosure of Invention
The invention aims to provide a TRIAC dimmer current maintaining circuit and a linear dimming driving circuit using the same, wherein the TRIAC dimmer current maintaining circuit has the advantages of simple structure, low cost, basically no consumption of electric energy and great improvement of the efficiency of the linear dimming driving circuit using the same.
The technical scheme adopted for solving the technical problems is as follows: a TRIAC dimmer current maintenance circuit is characterized in that the TRIAC dimmer current maintenance circuit is an RC circuit formed by connecting a first resistor and a first capacitor in series, and the RC circuit is connected with any rectifier diode in a rectifier bridge in a linear dimming driving circuit in parallel.
The linear dimming driving circuit of the TRIAC dimmer current maintenance circuit is characterized by comprising an overcurrent protection circuit, a rectifier bridge formed by connecting four rectifier diodes, an RC circuit, an anti-surge circuit for absorbing high surge voltage in input voltage, a filtering circuit for weakening or filtering stroboscopic light generated by the asymmetry of LED load current caused by the RC circuit, a linear constant current circuit, a stroboscopic light removing circuit for removing stroboscopic light generated by the asymmetry of LED load current caused by the RC circuit, wherein the input end of the overcurrent protection circuit is connected with low-frequency alternating current in the city, the output end of the overcurrent protection circuit is connected with the input end of the rectifier bridge, the RC circuit is connected with any rectifier diode in parallel, the output end of the rectifier bridge is connected with the input end of the anti-surge circuit, the output end of the anti-surge circuit is connected with the input end of the filtering circuit, the output end of the filtering circuit is connected with the input end of the linear constant current circuit, the input end of the stroboscopic light removing circuit is connected with the input end of the filtering circuit, and the output end of the filtering circuit is connected with the input end of the linear constant current removing circuit.
The stroboscopic removing circuit adopts a discrete component structure and consists of an MOS tube, a first voltage-stabilizing diode and a second capacitor, wherein a grid electrode of the MOS tube is respectively connected with an anode of the first voltage-stabilizing diode and one end of the second capacitor, a source electrode of the MOS tube is connected with the other end of the second capacitor, a public connecting end of the MOS tube is connected with the linear constant current circuit, a drain electrode of the MOS tube is connected with a cathode of the first voltage-stabilizing diode, and a public connecting end of the MOS tube is connected with a cathode of an LED load.
The MOS transistor comprises a MOS transistor, a first voltage-stabilizing diode and a second voltage-stabilizing diode, wherein a sub-circuit capable of enabling current ripple to be smaller is arranged between a grid electrode of the MOS transistor and an anode of the first voltage-stabilizing diode, the sub-circuit is formed by connecting a second resistor and the second voltage-stabilizing diode in parallel, a public connecting end, connected with a cathode of the second voltage-stabilizing diode, of one end of the second resistor is connected with the grid electrode of the MOS transistor, and a public connecting end, connected with an anode of the second voltage-stabilizing diode, of the other end of the second resistor is connected with the anode of the first voltage-stabilizing diode. Here, a sub-circuit formed by connecting a second resistor and a second zener diode in parallel is added between the gate of the MOS transistor and the positive electrode of the first zener diode in order to obtain a current with smaller ripple.
The stroboscopic removing circuit adopts a chip structure and consists of a stroboscopic removing chip and a third capacitor, 1 foot of the stroboscopic removing chip is connected with one end of the third capacitor, the other 1 foot of the stroboscopic removing chip is connected with the other end of the third capacitor, the common connecting end of the stroboscopic removing chip is connected with the linear constant current circuit, and the other 1 foot of the stroboscopic removing chip is connected with the negative electrode of the LED load.
Compared with the prior art, the invention has the advantages that:
1) The first capacitor is a reactive loss element, and meanwhile, the resistance value of the first resistor is smaller, so that the loss of the TRIAC dimmer current maintenance circuit is extremely small, and the efficiency of the linear dimming driving circuit using the same is improved; meanwhile, due to the existence of the first capacitor, when the input voltage is lower than the output voltage, the input voltage can be output to the LED load after being overlapped with the voltage on the first capacitor, so that the dimming depth is widened; in addition, the TRIAC dimmer current maintaining circuit is composed of only a first resistor and a first capacitor, and is simple in structure and low in cost.
2) The current maintaining circuit of the TRIAC dimmer is an RC circuit, so that the loss is very small, the efficiency is improved, the dimming depth is widened, but the current waveforms flowing through the LED load in the positive half cycle and the negative half cycle are inconsistent, the frequency is low, and the stroboscopic effect is increased; in addition, because the RC circuit is directly connected in parallel between the input end and the output end of the rectifier bridge, when high surge voltage is input, the high surge voltage can be directly output to the linear dimming driving circuit through the RC circuit, and the LED load and the linear constant current circuit are easy to damage, so the linear dimming driving circuit solves the problems by adding the anti-surge circuit and the stroboscopic removing circuit, the linear dimming driving circuit is high-efficiency and free of stroboscopic, and the efficiency is improved by more than 10% compared with the existing linear power supply.
Drawings
FIG. 1a is a schematic diagram of a first connection between an RC circuit and a rectifier bridge;
FIG. 1b is a second connection of an RC circuit and a rectifier bridge;
FIG. 1c is a third connection method of an RC circuit and a rectifier bridge;
FIG. 1d shows a fourth connection of an RC circuit and a rectifier bridge;
FIG. 2 is a schematic diagram of a linear dimming driving circuit;
FIG. 3 is a circuit diagram of a linear dimming driving circuit when the RC circuit adopts a first wiring mode;
FIG. 4 is a graph showing the voltage and current of the linear dimming driving circuit when the RC circuit adopts the first wiring mode;
FIG. 5a is a circuit diagram of a first configuration of a deflash circuit;
FIG. 5b is a circuit diagram of a second configuration of the deflash circuit;
FIG. 5c is a circuit diagram of a third configuration of a deflash circuit;
fig. 6 is a saturation diagram of the MOS transistor in the first strobe removal circuit.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
Embodiment one:
as shown in fig. 1a to 1d, the current maintaining circuit of the TRIAC dimmer according to the present embodiment is an RC circuit 1 formed by connecting a first resistor R1 and a first capacitor C1 in series, wherein the RC circuit 1 is connected in parallel with any one of rectifier diodes in a rectifier bridge of a linear dimming driving circuit. Because the first capacitor C1 is a reactive loss element, and meanwhile, the resistance value of the first resistor R1 is smaller, the loss of the current maintaining circuit of the TRIAC dimmer is extremely small, so that the efficiency of the linear dimming driving circuit using the same is high; meanwhile, due to the existence of the first capacitor C1, when the input voltage is lower than the output voltage, the input voltage can be output to the LED load after being overlapped with the voltage on the first capacitor C1, so that the dimming depth is widened.
Since the rectifier bridge is formed by connecting four rectifier diodes D1, D2, D3, D4, the RC circuit 1 has four connection modes. In the rectifier bridge, the positive electrode of the 1 st rectifier diode D1 is connected with the negative electrode of the 3 rd rectifier diode D3, the public connection end of the positive electrode is connected with a live wire L, the negative electrode of the 1 st rectifier diode D1 is connected with the negative electrode of the 2 nd rectifier diode D2, the public connection end of the positive electrode is an output end of the rectifier bridge, the positive electrode of the 2 nd rectifier diode D2 is connected with the negative electrode of the 4 th rectifier diode D4, the public connection end of the positive electrode is connected with a zero line N, the positive electrode of the 3 rd rectifier diode D3 is connected with the positive electrode of the 4 th rectifier diode D4, and the public connection end of the positive electrode is a grounding end of the rectifier bridge; first mode of connection: as shown in fig. 1a, one end of the RC circuit 1 is connected to a common connection end of the positive electrode of the 1 st rectifying diode D1 and the live wire L, and the other end of the RC circuit 1 is connected to the negative electrode of the 1 st rectifying diode D1; the second wiring mode is as follows: as shown in fig. 1b, one end of the RC circuit 1 is connected to the common connection end of the positive pole of the 2 nd rectifying diode D2 and the zero line N, and the other end of the RC circuit 1 is connected to the negative pole of the 2 nd rectifying diode D2; third mode of connection: as shown in fig. 1c, one end of the RC circuit 1 is connected to the common connection end of the negative electrode of the 3 rd rectifying diode D3 and the live wire L, and the other end of the RC circuit 1 is connected to the positive electrode of the 3 rd rectifying diode D3; fourth mode of connection: as shown in fig. 1D, one end of the RC circuit 1 is connected to the common connection terminal of the cathode of the 4 th rectifying diode D4 and the zero line N, and the other end of the RC circuit 1 is connected to the anode of the 4 th rectifying diode D4.
The working principle of the RC circuit is as follows: taking the first connection mode as an example, when the input voltage is in a negative half cycle (the zero line N is connected to be positive, the live line L is connected to be negative), the input voltage returns to the live line L from the zero line N after passing through the 2 nd rectifier diode D2 and the RC circuit 1, and at the moment, the input voltage charges a first capacitor C1 in the RC circuit 1, and the charging current of the first capacitor C1 provides a maintaining current for the TRIAC dimmer; when the input voltage is in the positive half cycle (the live wire L is connected to be positive, the zero line N is connected to be negative), the input voltage is overlapped with the voltage on the first capacitor C1 and then returns to the zero line N through the linear dimming driving circuit, and at the moment, the input current and the discharge current of the first capacitor C1 jointly provide the maintaining current for the TRIAC dimmer, so that no matter the input voltage is in the positive half cycle or the negative half cycle, the current exists on the TRIAC dimmer. The working principle of the second wiring mode, the third wiring mode and the fourth wiring mode is the same as that of the first wiring mode.
Embodiment two:
the present embodiment proposes a linear dimming driving circuit using the TRIAC dimmer current maintenance circuit of the first embodiment, as shown in fig. 2, which includes an overcurrent protection circuit 2, a rectifier bridge 3 formed by connecting four rectifier diodes D1, D2, D3, D4, an RC circuit 1, an anti-surge circuit 4 for absorbing high surge voltage in input voltage, a filter circuit 5 for weakening or filtering out a strobe generated by the LED load current asymmetry caused by the RC circuit 1, a linear constant current circuit 6, a strobe removal circuit 7 for removing a strobe generated by the LED load current asymmetry caused by the RC circuit 1, an input terminal of the overcurrent protection circuit 2 is connected to a low frequency ac in the city, an output terminal of the overcurrent protection circuit 2 is connected to an input terminal of the rectifier bridge 3, the RC circuit 1 is connected in parallel with any one of the rectifier diodes, an output terminal of the rectifier bridge 3 is connected to an input terminal of the anti-surge circuit 4, an output terminal of the anti-surge circuit 4 is connected to an input terminal of the filter circuit 5, an output terminal of the filter circuit 5 is connected to an input terminal of the linear constant current circuit 6, an output terminal of the linear constant current circuit 6 is connected to an output terminal of the filter circuit 7, and an output terminal of the rectifier bridge 3 and the output terminal of the anti-surge circuit 4 is connected to the input terminal of the linear constant current circuit 7 is connected to the input terminal of the filter circuit 7. Because of the existence of the first capacitor C1 in the RC circuit 1, when the input voltage is lower than the output voltage, the input voltage can be output to the LED load 8 after being overlapped with the voltage on the first capacitor C1, so that the dimming depth is widened, but the waveform of the current flowing through the LED load 8 in the positive half cycle and the negative half cycle is inconsistent, the frequency is lower, and the stroboscopic effect is increased; in addition, since the RC circuit 1 is directly connected in parallel between the input terminal and the output terminal of the rectifier bridge 3, when a high surge voltage is input, the high surge voltage can be directly output to the linear dimming driving circuit through the RC circuit 1, and the LED load 8 and the linear constant current circuit 6 are easily damaged. The linear dimming driving circuit solves the above-described problem by adding the anti-surge circuit 4 and the stroboscopic removing circuit 7.
Fig. 3 shows a circuit diagram of the linear dimming driving circuit when the RC circuit adopts the first wiring mode. The overcurrent protection circuit 2 includes a fuse resistor Rfuse; the anti-surge circuit 4 comprises a fourth capacitor C4; the filter circuit 5 comprises an electrolytic capacitor CD and a third resistor R3; the linear constant current circuit 6 comprises a linear constant current chip U1 and a fourth resistor R4, and the linear constant current chip U1 adopts the prior art. One end of a fuse resistor Rfuse is connected with the input end of a live wire L, the other end of the fuse resistor Rfuse is respectively connected with the positive electrode of a 1 st rectifying diode D1 and the negative electrode of a 3 rd rectifying diode D3, the negative electrode of the 1 st rectifying diode D1 is connected with the negative electrode of a 2 nd rectifying diode D2, the positive electrode of the 2 nd rectifying diode D2 is connected with the negative electrode of a 4 th rectifying diode D4, the common connection end of the 2 nd rectifying diode D2 is connected with the input end of a zero line N, the positive electrode of the 3 rd rectifying diode D3 is connected with the positive electrode of the 4 th rectifying diode D4, the common connection end of the 3 rd rectifying diode D3 is grounded, one end of an RC circuit 1 is connected with the common connection end of the positive electrode of the 1 st rectifying diode D1 and the other end of the fuse resistor Rfuse, the other end of the RC circuit 1 is connected with the negative electrode of the 1 st rectifying diode D1, the fourth capacitor C4 is connected in parallel between the common connection end of the cathode of the 1 st rectifying diode D1 and the cathode of the 2 nd rectifying diode D2 and the common connection end of the anode of the 3 rd rectifying diode D3 and the anode of the 4 th rectifying diode D4, the common connection end of the fourth capacitor C4 and the cathode of the 1 st rectifying diode D1 and the cathode of the 2 nd rectifying diode D2 are respectively connected with the anode of the LED load 8 and the anode of the electrolytic capacitor CD, the third resistor R3 is connected in parallel between the anode and the cathode of the electrolytic capacitor CD, the common connection end of the third resistor R3 and the cathode of the electrolytic capacitor CD is connected with the input pin of the linear constant current chip U1, the 1 pin of the linear constant current chip U1 is grounded, the other 1 pin of the linear constant current chip U1 is grounded after the fourth resistor R4 is connected in series, and the input pin of the linear constant current chip U1 is connected with the strobe removing circuit 7. Here, the anti-surge circuit 4 adopts a common anti-high voltage circuit, i.e. comprises a capacitor, or adopts an anti-high voltage circuit comprising a capacitor and an anti-surge device; in the filtering circuit 5, the third resistor R3 is used as a bleeder resistor, if the capacitance of the electrolytic capacitor CD is large enough, the filtering circuit is enough to filter the stroboscopic effect generated by the asymmetry of the LED load current caused by the RC circuit 1, and the stroboscopic effect removing circuit 7 can be omitted; the fourth resistor R4 is used as a sampling resistor in the linear constant current circuit 6.
In this embodiment, the strobe removing circuit 7 adopts a discrete component structure, as shown in fig. 3 and 5a, and is composed of a MOS transistor Q1, a first zener diode DZ1 and a second capacitor C2, wherein the gate of the MOS transistor Q1 is connected to the positive electrode of the first zener diode DZ1 and one end of the second capacitor C2 respectively, the source of the MOS transistor Q1 is connected to the other end of the second capacitor C2, the common connection end of the MOS transistor Q1 is connected to the input pin of the linear constant current chip U1 in the linear constant current circuit 6, the drain of the MOS transistor Q1 is connected to the negative electrode of the first zener diode DZ1, and the common connection end of the MOS transistor Q1 is connected to the negative electrode of the LED load 8. When the voltage V across the gate and the source of the MOS transistor Q1 GS Satisfy V GS ＞V GS (th)，V GS (th) is the turn-on voltage of both ends of the gate and the source of the MOS transistor Q1, and the voltage V of both ends of the drain and the source of the MOS transistor Q1 DS Satisfy V DS ＞V GS -V GS When (th), the MOS transistor Q1 enters the saturation region, and FIG. 6 shows the saturation curve of the MOS transistor Q1, at this time, the current I of the MOS transistor Q1 D Subject to V only GS Control and V DS Irrelevant, i.e. current I of MOS transistor Q1 D Only across the second capacitor C2Voltage control; when the input voltage is higher than the predetermined threshold of the first zener diode DZ1, the first zener diode DZ1 is broken down, and the input voltage is filtered by the second capacitor C2 to output a stable control voltage V GS To the MOS transistor Q1, the MOS transistor Q1 is conducted to obtain stable current.
Fig. 4 shows a voltage-current graph of the linear dimming driving circuit when the RC circuit adopts the first connection mode, when the input voltage is in the negative half cycle (the zero line N is connected to be positive, and the live line L is connected to be negative), the input voltage returns to the live line L from the zero line N after passing through the 2 nd rectifying diode D2 and the RC circuit 1, at this time, the input voltage charges the first capacitor C1 in the RC circuit 1, and the charging current of the first capacitor C1 provides the holding current for the TRIAC dimmer; when the input voltage is in the positive half cycle (the live wire L is connected to be positive, the zero line N is connected to be negative), the input voltage is overlapped with the voltage on the first capacitor C1 and then returns to the zero line N through the linear dimming driving circuit, and at the moment, the input current and the discharge current of the first capacitor C1 jointly provide the maintaining current for the TRIAC dimmer, so that no matter the input voltage is in the positive half cycle or the negative half cycle, the current exists on the TRIAC dimmer.
Embodiment III:
the linear dimming driving circuit provided in this embodiment is based on the linear dimming driving circuit in the second embodiment, and further improves the strobe removing circuit, specifically: as shown in fig. 5b, a sub-circuit 9 capable of making current ripple smaller is arranged between the gate of the MOS transistor Q1 and the positive electrode of the first zener diode DZ1, the sub-circuit 9 is formed by connecting a second resistor R2 and the second zener diode DZ2 in parallel, a common connection end of one end of the second resistor R2 connected with the negative electrode of the second zener diode DZ2 is connected with the gate of the MOS transistor Q1, and a common connection end of the other end of the second resistor R2 connected with the positive electrode of the second zener diode DZ2 is connected with the positive electrode of the first zener diode DZ 1. Here, a sub-circuit 9 formed by connecting the second resistor R2 and the second zener diode DZ2 in parallel is added between the gate of the MOS transistor Q1 and the positive electrode of the first zener diode DZ1 in order to obtain a current with smaller ripple.
Embodiment four:
the structure of the linear dimming driving circuit proposed in this embodiment is basically the same as that of the linear dimming driving circuit in the second embodiment, and the difference is that the structure of the strobe removing circuit is different, and the structure of the strobe removing circuit in this embodiment is as follows: the chip structure is adopted, as shown in fig. 5C, and the chip structure is composed of a stroboscopic removing chip U2 and a third capacitor C3, wherein 1 foot of the stroboscopic removing chip U2 is connected with one end of the third capacitor C3, the other 1 foot of the stroboscopic removing chip U2 is connected with the other end of the third capacitor C3, the common connecting end of the stroboscopic removing chip U2 is connected with a linear constant current circuit 6, and the other 1 foot of the stroboscopic removing chip U2 is connected with the negative electrode of an LED load 8. Here, the operating principle of the inside of the stroboscopic removing chip U2 is similar to that of the stroboscopic removing circuit employing a discrete element structure.
Claims (4)
1. The linear dimming driving circuit is characterized by using a TRIAC dimmer current maintenance circuit, wherein the TRIAC dimmer current maintenance circuit is an RC circuit formed by connecting a first resistor and a first capacitor in series, the linear dimming driving circuit comprises an overcurrent protection circuit, a rectifier bridge formed by connecting four rectifier diodes, the RC circuit, an anti-surge circuit for absorbing high surge voltage in input voltage, a filtering circuit for weakening or filtering stroboscopic light generated asymmetrically by the LED load current caused by the RC circuit, a linear constant current circuit, a stroboscopic light removing circuit for removing stroboscopic light generated asymmetrically by the RC circuit, an input end of the overcurrent protection circuit is connected with an input end of the rectifier bridge, an output end of the overcurrent protection circuit is connected with an input end of any one of the rectifier diodes in parallel, an output end of the rectifier bridge is connected with an input end of the anti-surge circuit, a stroboscopic light removing filter circuit is connected with an output end of the filtering circuit, an output end of the stroboscopic light removing filter circuit is connected with an input end of the linear constant current removing filter circuit, and an output end of the linear constant current removing filter circuit is connected with an input end of the linear constant current removing filter circuit.
2. The linear dimming driving circuit according to claim 1, wherein the stroboscopic removing circuit is of a discrete component structure, and is composed of an MOS transistor, a first zener diode and a second capacitor, wherein a gate of the MOS transistor is connected to an anode of the first zener diode and one end of the second capacitor respectively, a source of the MOS transistor is connected to the other end of the second capacitor, a common connection end of the MOS transistor is connected to the linear constant current circuit, a drain of the MOS transistor is connected to a cathode of the first zener diode, and a common connection end of the MOS transistor is connected to a cathode of the LED load.
3. The linear dimming driving circuit according to claim 2, wherein a sub-circuit capable of making current ripple smaller is arranged between the gate of the MOS transistor and the positive electrode of the first zener diode, the sub-circuit is formed by connecting a second resistor and a second zener diode in parallel, a common connection end of one end of the second resistor connected with the negative electrode of the second zener diode is connected with the gate of the MOS transistor, and a common connection end of the other end of the second resistor connected with the positive electrode of the second zener diode is connected with the positive electrode of the first zener diode.
4. The linear dimming driving circuit according to claim 1, wherein the stroboscopic removing circuit is of a chip structure and is composed of a stroboscopic removing chip and a third capacitor, wherein one pin of the stroboscopic removing chip is connected with one end of the third capacitor, the other 1 pin of the stroboscopic removing chip is connected with the other end of the third capacitor, a common connection end of the stroboscopic removing chip is connected with the linear constant current circuit, and the other 1 pin of the stroboscopic removing chip is connected with a negative electrode of the LED load.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711203084.9A CN108601131B (en) | 2017-11-27 | 2017-11-27 | TRIAC dimmer current maintaining circuit and linear dimming driving circuit using same |
| US16/024,880 US10440785B2 (en) | 2017-11-27 | 2018-07-01 | Current holding circuit for bidirectional triode thyristor dimmer and linear dimming driving circuit using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711203084.9A CN108601131B (en) | 2017-11-27 | 2017-11-27 | TRIAC dimmer current maintaining circuit and linear dimming driving circuit using same |
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| CN108601131A CN108601131A (en) | 2018-09-28 |
| CN108601131B true CN108601131B (en) | 2023-11-10 |
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| JP2011054538A (en) * | 2009-09-04 | 2011-03-17 | Toshiba Lighting & Technology Corp | Led lighting device and illumination apparatus |
| TWM473026U (en) * | 2013-06-04 | 2014-02-21 | Jin-Fa Li | Active self-regulating circuit |
| CN104219827A (en) * | 2013-06-04 | 2014-12-17 | 李进发 | Active self-adjusting circuit |
| CN204131769U (en) * | 2014-11-07 | 2015-01-28 | 四川嘉汇电子科技有限公司 | Export stable constant current LED power supplies |
| WO2015131389A1 (en) * | 2014-03-07 | 2015-09-11 | 深圳市众明半导体照明有限公司 | Mr16 type led spotlight and dimming power source thereof |
| CN106332361A (en) * | 2016-09-20 | 2017-01-11 | 浙江阳光美加照明有限公司 | Frequency-flicker-free LED filament lamp |
-
2017
- 2017-11-27 CN CN201711203084.9A patent/CN108601131B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011054538A (en) * | 2009-09-04 | 2011-03-17 | Toshiba Lighting & Technology Corp | Led lighting device and illumination apparatus |
| TWM473026U (en) * | 2013-06-04 | 2014-02-21 | Jin-Fa Li | Active self-regulating circuit |
| CN104219827A (en) * | 2013-06-04 | 2014-12-17 | 李进发 | Active self-adjusting circuit |
| WO2015131389A1 (en) * | 2014-03-07 | 2015-09-11 | 深圳市众明半导体照明有限公司 | Mr16 type led spotlight and dimming power source thereof |
| CN204131769U (en) * | 2014-11-07 | 2015-01-28 | 四川嘉汇电子科技有限公司 | Export stable constant current LED power supplies |
| CN106332361A (en) * | 2016-09-20 | 2017-01-11 | 浙江阳光美加照明有限公司 | Frequency-flicker-free LED filament lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108601131A (en) | 2018-09-28 |
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