CN109905941B - Unipolar multi-mode wide-range input voltage LED driver without electrolytic capacitor - Google Patents
Unipolar multi-mode wide-range input voltage LED driver without electrolytic capacitor Download PDFInfo
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- CN109905941B CN109905941B CN201910170219.9A CN201910170219A CN109905941B CN 109905941 B CN109905941 B CN 109905941B CN 201910170219 A CN201910170219 A CN 201910170219A CN 109905941 B CN109905941 B CN 109905941B
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- 239000003990 capacitor Substances 0.000 title claims abstract description 77
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Abstract
The invention discloses a unipolar multimode wide-range input voltage LED driver without electrolytic capacitor, which comprises an alternating current power supply, a filter inductor, a filter capacitor, 4 rectifier diodes, 4 switching tubes, 2 input capacitors, 2 boost diodes, a boost inductor, 2 output diodes, 2 LED loads, an output inductor and 2 output capacitors, wherein 2 switching tubes form a bidirectional switch. When the input voltage is 220V, the two-way switch is disconnected, the LED driver works in a half-voltage input mode, and low bus voltage and high efficiency can be realized; when the input voltage is 110V, the bidirectional switch is conducted, the LED driver works in a full-voltage input mode, the conduction loss of the bridge rectifier diode and the other 2 switching tubes is reduced, and the efficiency of the system under the condition of low input voltage is improved. The invention has the advantages of high efficiency, wide voltage input range, low bus voltage, no electrolytic capacitor and the like.
Description
Technical Field
The invention relates to the technical field of LED driving, in particular to a monopole multi-mode wide-range input voltage electrolytic capacitor-free LED driver.
Background
The conventional LED driver topology consists of a two-stage structure: a Power Factor Correction (PFC) stage and a half-bridge DC/DC converter stage. While the independence of the two-stage structure simplifies the design, the control complexity and system cost increase accordingly. At the same time, the efficiency is relatively low due to the need for more control circuits and switching devices. Therefore, a unipolar LED driver in which a control circuit and a switching device are commonly used is widely used. The traditional unipolar bridgeless boost PFC LED driver has the advantages of high efficiency, high power factor and the like, but due to the fact that the traditional unipolar bridgeless boost PFC LED driver works in a DCM mode, bus voltage is too high, and V is usually the case Bus >2V in (V in For input voltage amplitude). This not only places higher demands on the withstand voltage of the bus capacitor, but also places greater voltage stresses on the switching tube. When the effective value of the input voltage is 220V, V Bus Will reach 600V or more. Therefore, the unipolar bridgeless boost PFC LED driver is commonly used in low input voltage occasions, and the application range of the unipolar bridgeless boost PFC LED driver is limited. Although the bridge boost PFC LED driver can effectively reduce the bus voltage, it includes a full bridge rectifying structure, which causes higher conduction loss at low input voltage and system efficiency is low.
Disclosure of Invention
The invention aims to overcome the defect that the traditional LED driver cannot be applied to occasions with high input voltage and low input voltage, and provides a unipolar multi-mode wide-range input voltage electrolytic-capacitor-free LED driver capable of working in a wide range of input voltage, which can realize high efficiency and optimized bus voltage.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows: the LED driver comprises an alternating current power supply, a filter inductor, a filter capacitor, a first rectifying diode, a second rectifying diode, a third rectifying diode, a fourth rectifying diode, a first switching tube, a second switching tube, a first input capacitor, a second input capacitor, a first boosting diode, a second boosting diode, a boosting inductor, a third switching tube, a fourth switching tube, a first output diode, a second output diode, a first LED load, a second LED load, an output inductor, a first output capacitor and a second output capacitor; one end of the alternating current power supply is connected with the anode of the first rectifier diode, the cathode of the second rectifier diode and one end of the filter capacitor, and the other end of the alternating current power supply is connected with one end of the filter inductor; the other end of the filter inductor is connected with the anode of the third rectifier diode, the cathode of the fourth rectifier diode, the other end of the filter capacitor and the drain electrode of the first switch tube; the source electrode of the first switching tube is connected with the source electrode of the second switching tube to form a bidirectional switch; the drain electrode of the second switching tube is connected with the negative electrode of the first input capacitor, the positive electrode of the second input capacitor and one end of the boost inductor; the anode of the first input capacitor is connected with the cathode of the first rectifying diode, the cathode of the third rectifying diode and the anode of the first boosting diode; the cathode of the second input capacitor is connected with the anode of the second rectifying diode, the anode of the fourth rectifying diode and the cathode of the second boosting diode; the other end of the boost inductor is connected with the source electrode of the third switching tube, the drain electrode of the fourth switching tube, the anode of the first output diode and the cathode of the second LED load; the drain electrode of the third switching tube is connected with the cathode of the first boost diode and the anode of the first output capacitor; the source electrode of the fourth switching tube is connected with the anode of the second boost diode and the cathode of the second output capacitor; the cathode of the first output diode is connected with the anode of the first LED load; the anode of the second LED load is connected with the cathode of the second output diode; the cathode of the first LED load is connected with the anode of the second output diode and one end of the output inductor; the other end of the output inductor is connected with the negative electrode of the first output capacitor and the positive electrode of the second output capacitor.
The LED driver works in different modes through the connection and disconnection of the first switch tube and the second switch tube under the condition of different input voltages so as to obtain high efficiency and low bus voltage; when the input voltage is in the range of 220-240Vrms, the first switch tube and the second switch tube are turned off, the LED driver works in a half-voltage input mode to obtain low bus voltage, the switching stress of the device is reduced, the high input voltage in the half-voltage input mode is divided equally by the first input capacitor and the second input capacitor, and the boost inductor works in a critical conduction mode; when the input voltage is in the range of 100-120Vrms, the first switch tube and the second switch tube are conducted, the LED driver works in a full-voltage input mode, the diode conduction loss is reduced, the system efficiency is improved, in the full-voltage input mode, because the voltage of the first input capacitor and the voltage of the second input capacitor are non-negative, the third rectifying diode and the fourth rectifying diode are turned off, in the positive half period of the input voltage, the voltage of the first input capacitor is equal to the input voltage, the voltage of the second input capacitor is kept to be zero, in the negative half period of the input voltage, the voltage of the second input capacitor is equal to the input voltage, and the voltage of the first input capacitor is kept to be zero.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. under the condition of high input voltage, the voltage stress of the bus capacitor and the switching device is reduced by turning off the first switching tube and the second switching tube to reduce the bus voltage.
2. Under the condition of low input voltage, the rectifier diode and the switching tube loss are reduced by switching on the first switching tube and the second switching tube, and the system efficiency is improved.
3. No electrolytic capacitor and long service life.
In a word, the invention can work in different modes according to different input voltages, realizes low bus voltage at high input voltage, realizes high efficiency at low input voltage, has simple structure and flexible control, has good application prospect, and is worthy of popularization.
Drawings
FIG. 1 is a circuit diagram of a unipolar multi-mode wide-range input voltage electrolytic capacitor-less LED driver of the present invention.
Fig. 2a is an equivalent circuit diagram of the present invention when operating in half-voltage input mode.
Fig. 2b is an equivalent circuit diagram of the present invention when operating in full-voltage input mode.
Detailed Description
The invention will be further described with reference to specific examples.
As shown in FIG. 1, the unipolar multi-mode wide-range input voltage LED driver without electrolytic capacitor provided in the present embodiment comprises an AC power supply V in Filter inductance L f Filter capacitor C f First rectifier diode D 1 Second rectifier diode D 2 Third rectifier diode D 3 Fourth rectifier diode D 4 First switch tube S 1 Second switch tube S 2 First input capacitance C 1 A second input capacitor C 2 First boost diode D 5 Second boost diode D 6 Boost inductance L b Third switch tube S 3 Fourth switching tube S 4 A first output diode D 7 Second output diode D 8 First LED load LED 1 Second LED load LED 2 Output inductance L r First output capacitor C b1 A second output capacitor C b2 The method comprises the steps of carrying out a first treatment on the surface of the The alternating current power supply V in One end of (a) is connected with the first rectifier diode D 1 Anode of (D) second rectifier diode D 2 Cathode, filter capacitor C of (2) f One end of which is connected with the filter inductance L f Is connected with one end of the connecting rod; the filter inductance L f And the other end of (2) is rectified with a third rectifierDiode D 3 Anode of fourth rectifier diode D 4 Cathode, filter capacitor C of (2) f Is connected with the other end of the first switch tube S 1 Is connected with the drain electrode of the transistor; the first switch tube S 1 Source electrode of (a) and second switch tube S 2 The sources of the two-way switch are connected to form the two-way switch; the second switching tube S 2 Drain of (C) and first input capacitance C 1 Negative electrode of (C) and second input capacitance (C) 2 Positive electrode of (a), boost inductance L b Is connected with one end of the connecting rod; the first input capacitor C 1 The positive electrode of (a) and the first rectifying diode D 1 Cathode, third rectifier diode D 3 Cathode of (D), first boost diode D 5 Is connected with the anode of the battery; the second input capacitor C 2 Cathode of (D) and second rectifying diode D 2 Anode of fourth rectifier diode D 4 Anode of (D) second boost diode D 6 Is connected with the cathode of the battery; the boost inductance L b The other end of (a) and a third switch tube S 3 Source electrode of fourth switching tube S 4 Drain of (D), first output diode D 7 Anode, second LED load LED of (c) 2 Is connected with the cathode of the battery; the third switching tube S 3 Drain of (D) and first boost diode D 5 Cathode of (a) first output capacitor C b1 Is connected with the positive electrode of the battery; the fourth switching tube S 4 Source electrode of (C) and second boost diode D 6 Anode of (C) second output capacitor (C) b2 Is connected with the negative electrode of the battery; the first output diode D 7 Cathode of (c) and first LED load LED 1 Is connected with the anode of the battery; the second LED loads LEDs 2 Anode of (D) and second output diode D 8 Is connected with the cathode of the battery; the first LED load LED 1 Cathode of (D) and second output diode D 8 Anode, output inductance L of (2) r Is connected with one end of the connecting rod; the output inductance L r And the other end of the first output capacitor C b1 Negative electrode of (C) and second output capacitor (C) b2 Is connected to the positive electrode of the battery.
The working principle of the unipolar multimode wide-range input voltage electrolytic-capacitor-free LED driver of the embodiment is as follows: when the input voltage V in In the range of 220-240Vrms, a first switching tube S 1 And a second switching tube S 2 The LED driver is turned off, and the LED driver is operated in half-voltage input mode, and the equivalent circuit is shown in fig. 2 a. In the half-voltage input mode, the high input voltage is input through the first input capacitor C 1 And a second input capacitance C 2 Equally dividing, realizing low bus voltage. In addition boost inductance L r Operating in critical conduction mode to achieve high power factor. When the input voltage V in In the range of 100-120Vrms, a first switching tube S 1 And a second switching tube S 2 On, the LED driver operates in full voltage input mode. In the full-voltage input mode, because of the first input capacitance C 1 And a second input capacitance C 2 Is non-negative, a third rectifier diode D 3 And a fourth rectifier diode D 4 The switch-off and the equivalent circuit is shown in fig. 2 b. In the positive half period of the input voltage, a first input capacitor C 1 Is equal to the input voltage, a second input capacitance C 2 Is kept at zero; in the negative half period of the input voltage, the second input capacitor C 2 Is equal to the input voltage, a first input capacitor C 1 Is kept at zero. The full-voltage input mode reduces the loss of the diode and the switching device and improves the system efficiency. In addition boost inductance L r Operating in discontinuous conduction mode to ensure a high power factor.
In summary, the unipolar multi-mode wide-range input voltage LED driver without the electrolytic capacitor realizes the optimization of bus voltage, effectively reduces the voltage stress of the bus capacitor and the switching device under the condition of high input voltage, reduces the loss of the system under the condition of low input voltage, and improves the system efficiency. In addition, the LED driver realizes no electrolytic capacitor, and effectively improves the service life and reliability of the system.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, so variations in shape and principles of the present invention should be covered.
Claims (1)
1. The unipolar multimode wide-range input voltage LED driver without the electrolytic capacitor is characterized in that: the LED driver comprises an alternating current power supply, a filter inductor, a filter capacitor, a first rectifying diode, a second rectifying diode, a third rectifying diode, a fourth rectifying diode, a first switching tube, a second switching tube, a first input capacitor, a second input capacitor, a first boosting diode, a second boosting diode, a boosting inductor, a third switching tube, a fourth switching tube, a first output diode, a second output diode, a first LED load, a second LED load, an output inductor, a first output capacitor and a second output capacitor; one end of the alternating current power supply is connected with the anode of the first rectifying diode, the cathode of the second rectifying diode and one end of the filter capacitor, and the other end of the alternating current power supply is connected with one end of the filter inductor; the other end of the filter inductor is connected with the anode of the third rectifier diode, the cathode of the fourth rectifier diode, the other end of the filter capacitor and the drain electrode of the first switch tube; the source electrode of the first switching tube is connected with the source electrode of the second switching tube to form a bidirectional switch; the drain electrode of the second switching tube is connected with the negative electrode of the first input capacitor, the positive electrode of the second input capacitor and one end of the boost inductor; the anode of the first input capacitor is connected with the cathode of the first rectifying diode, the cathode of the third rectifying diode and the anode of the first boosting diode; the cathode of the second input capacitor is connected with the anode of the second rectifying diode, the anode of the fourth rectifying diode and the cathode of the second boosting diode; the other end of the boost inductor is connected with the source electrode of the third switching tube, the drain electrode of the fourth switching tube, the anode of the first output diode and the cathode of the second LED load; the drain electrode of the third switching tube is connected with the cathode of the first boost diode and the anode of the first output capacitor; the source electrode of the fourth switching tube is connected with the anode of the second boost diode and the cathode of the second output capacitor; the cathode of the first output diode is connected with the anode of the first LED load; the anode of the second LED load is connected with the cathode of the second output diode; the cathode of the first LED load is connected with the anode of the second output diode and one end of the output inductor; the other end of the output inductor is connected with the negative electrode of the first output capacitor and the positive electrode of the second output capacitor;
the LED driver works in different modes through the connection and disconnection of the first switch tube and the second switch tube under the condition of different input voltages so as to obtain high efficiency and low bus voltage; when the input voltage is in the range of 220-240Vrms, the first switch tube and the second switch tube are turned off, the LED driver works in a half-voltage input mode to obtain low bus voltage, the switching stress of the device is reduced, the high input voltage in the half-voltage input mode is divided equally by the first input capacitor and the second input capacitor, and the boost inductor works in a critical conduction mode; when the input voltage is in the range of 100-120Vrms, the first switch tube and the second switch tube are conducted, the LED driver works in a full-voltage input mode, the diode conduction loss is reduced, the system efficiency is improved, in the full-voltage input mode, because the voltage of the first input capacitor and the voltage of the second input capacitor are non-negative, the third rectifying diode and the fourth rectifying diode are turned off, in the positive half period of the input voltage, the voltage of the first input capacitor is equal to the input voltage, the voltage of the second input capacitor is kept to be zero, in the negative half period of the input voltage, the voltage of the second input capacitor is equal to the input voltage, and the voltage of the first input capacitor is kept to be zero.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910170219.9A CN109905941B (en) | 2019-03-07 | 2019-03-07 | Unipolar multi-mode wide-range input voltage LED driver without electrolytic capacitor |
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| CN201910170219.9A CN109905941B (en) | 2019-03-07 | 2019-03-07 | Unipolar multi-mode wide-range input voltage LED driver without electrolytic capacitor |
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| CN109905941A CN109905941A (en) | 2019-06-18 |
| CN109905941B true CN109905941B (en) | 2023-11-28 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013063770A1 (en) * | 2011-11-02 | 2013-05-10 | 深圳市讯宇创科技有限公司 | Switched dimming led drive circuit and led light group |
| CN104768291A (en) * | 2015-03-26 | 2015-07-08 | 上海大学 | Improved Cuk LED drive power source without electrolytic capacitor |
| CN108990212A (en) * | 2018-07-26 | 2018-12-11 | 江苏大学 | Based on BOOST- reversed polarity BUCK Converter Interleaving Parallel no electrolytic capacitor LED drive power and switching method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9338843B2 (en) * | 2013-03-19 | 2016-05-10 | Praveen K. Jain | High power factor, electrolytic capacitor-less driver circuit for light-emitting diode lamps |
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2019
- 2019-03-07 CN CN201910170219.9A patent/CN109905941B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013063770A1 (en) * | 2011-11-02 | 2013-05-10 | 深圳市讯宇创科技有限公司 | Switched dimming led drive circuit and led light group |
| CN104768291A (en) * | 2015-03-26 | 2015-07-08 | 上海大学 | Improved Cuk LED drive power source without electrolytic capacitor |
| CN108990212A (en) * | 2018-07-26 | 2018-12-11 | 江苏大学 | Based on BOOST- reversed polarity BUCK Converter Interleaving Parallel no electrolytic capacitor LED drive power and switching method |
Non-Patent Citations (1)
| Title |
|---|
| AC-DC LED 驱动电源消除电解电容技术综述;汪飞等;电工技术学报;第第30卷卷(第第8期期);第176-185页 * |
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