CN111148319A - Double-voltage-mode LED lighting linear constant-current driving circuit - Google Patents
Double-voltage-mode LED lighting linear constant-current driving circuit Download PDFInfo
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- CN111148319A CN111148319A CN201911393940.0A CN201911393940A CN111148319A CN 111148319 A CN111148319 A CN 111148319A CN 201911393940 A CN201911393940 A CN 201911393940A CN 111148319 A CN111148319 A CN 111148319A
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Abstract
The invention provides a double-voltage mode LED lighting linear constant current driving circuit, wherein the input end of a rectifier is connected with alternating current; the anode of the first LED unit LED1 is connected to the positive output terminal of the rectifier DB 1; the cathode of the first LED unit LED1 is connected to the anode of the second LED unit LED2 and the input terminal of the first current source I1; the output end of the first current source I1 is connected with the negative output end of the rectifier DB 1; the anode of the third LED unit LED3 is connected to the cathode of the second LED unit LED 2; the cathode of the third LED unit LED3 is connected to the input of the second current source I2; the output end of the second current source I2 is connected with the negative output end of the rectifier DB 1; one end of the switch switching circuit SW1 is connected to the positive output terminal of the rectifier DB 1; the other end of the switch switching circuit SW1 is connected to the cathode of the second LED unit LED2 and the anode of the third LED unit LED 3. The LED lamp has the advantages that the LED lamp can work normally under a high-voltage mode and a low-voltage mode.
Description
Technical Field
The invention discloses an LED lighting product utilizing a multi-section linear constant current driving circuit, which is suitable for lamps capable of working in high and low voltage modes.
Background
On the LED illumination product, due to the practical application, the lamp can work in a high-voltage mode and also can work in a low-voltage mode. In practical application, due to the voltage requirement of high and low voltages, all the LED units can work normally at high voltage, but in the low-voltage mode, due to insufficient voltage, only a few LED units can work in the prior art.
Disclosure of Invention
The invention aims to provide a dual-voltage mode LED lighting linear constant current driving circuit, which can ensure the normal work of an effective LED unit in a high-voltage mode and a low-voltage mode and overcome the defects of the prior art.
The invention provides a double-voltage mode LED lighting linear constant current driving circuit, which comprises: the rectifier DB1, the switch switching circuit SW1, the first current source I1, the second current source I2, the first LED unit LED1, the second LED unit LED2 and the third LED unit LED3 (in practical applications, a diode may be connected in series with the LED2 to prevent current from flowing backward from SW1 to I1, although the diode may not be added if the reverse breakdown voltage of the LED2 is high enough). The input end of the rectifier is connected with alternating current. The anode of the first LED unit LED1 is connected to the positive output terminal of the rectifier DB 1. The cathode of the first LED unit LED1 is connected to the anode of the second LED unit LED2 and the input terminal of the first current source I1. The output of the first current source I1 is connected to the negative output of the rectifier DB 1. The anode of the third LED unit LED3 is connected to the cathode of the second LED unit LED 2. The cathode of the third LED unit LED3 is connected to the input of a second current source I2. The output of the second current source I2 is connected to the negative output of the rectifier DB 1. One end of the switch switching circuit SW1 is connected to the positive output terminal of the rectifier DB 1. The other end of the switch switching circuit SW1 is connected to the cathode of the second LED unit LED2 and the anode of the third LED unit LED 3.
Further, the present invention provides a dual voltage mode LED lighting linear constant current driving circuit, which may further have the following features: when the switch switching circuit SW1 is turned off, and the output voltage of the rectifier DB1 is equal to or greater than the operating voltage of the first LED unit LED1 and less than the sum of the operating voltages of the first LED unit LED1, the second LED unit LED2, and the third LED unit LED3, the first current source I1 operates, and the first LED unit LED1 is turned on. The second current source I2 is turned off, and the second LED unit LED2 and the third LED unit LED3 are not turned on.
Further, the present invention provides a dual voltage mode LED lighting linear constant current driving circuit, which may further have the following features: when the switch switching circuit SW1 is turned off, and the output voltage of the rectifier DB1 is equal to or greater than the sum of the operating voltages of the first LED unit LED1, the second LED unit LED2, and the third LED unit LED3, the first current source I1 is turned off, the second current source I2 is operated, and the first LED unit LED1, the second LED unit LED2, and the third LED unit LED3 are all turned on.
Further, the present invention provides a dual voltage mode LED lighting linear constant current driving circuit, which may further have the following features: the operating voltage of the second LED unit LED2 is less than the operating voltages of the first LED unit LED1, the third LED unit LED 3.
Further, the present invention provides a dual voltage mode LED lighting linear constant current driving circuit, which may further have the following features: when the switch switching circuit SW1 is closed and the output voltage of the rectifier DB1 is greater than the operating voltages of the first LED unit LED1 and the third LED unit LED3, the first current source I1 and the second current source I2 operate, the first LED unit LED1 and the third LED unit LED3 are turned on, and the second LED unit LED2 is turned off.
In addition, the invention also provides a dual-voltage mode LED lighting linear constant current driving circuit, which comprises: a rectifier DB1, a switch switching circuit SW1, a first current source I1, a second current source I2, a first LED unit LED1, a second LED unit LED2, a third LED unit LED3, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, and a third current source I0. The input end of the rectifier is connected with alternating current. The anode of the first LED unit LED1 is connected to the positive output terminal of the rectifier DB 1. The cathode of the first LED unit LED1 is connected to the input terminal of the first current source I1 and the anode of the fifth diode D5, respectively. The output of the first current source I1 is connected to the negative output of the rectifier DB 1. The input end of the third current source I0 is connected with the cathode of the fifth diode D5, and the output end is connected with the anode of the fifth diode. The anode of the first diode and the cathode of the third diode are both connected with the cathode of a fifth diode D5. The anodes of the second LED unit LED2 are connected to the cathode of the first diode D1 and the cathode of the second diode D2, respectively. The cathodes of the second LED unit LED2 are connected to the anode of the third diode D3 and the anode of the fourth diode D4, respectively. The anode of the third LED unit LED3 is connected to the anode of the second diode D2 and the cathode of the fourth diode D4. The cathode of the third LED unit LED3 is connected to the input of a second current source I2. The output of the second current source I2 is connected to the negative output of the rectifier DB 1. One end of the switch switching circuit SW1 is connected to the positive output terminal of the rectifier DB 1. The other end of the switch switching circuit SW1 is connected to the anode of the third LED unit LED 3.
Further, the present invention provides a dual voltage mode LED lighting linear constant current driving circuit, which may further have the following features: when the switch switching circuit SW1 is turned off, the output voltage of the rectifier DB1 is equal to or greater than the operating voltage of the first LED unit LED1 and less than the sum of the operating voltages of the first LED unit LED1, the second LED unit LED2, and the third LED unit LED 3. The first current source I1 is operated and the first LED unit LED1 is turned on. The second current source I2 and the third current source I0 are turned off, and the second LED unit LED2 and the third LED unit LED3 are turned off.
Further, the present invention provides a dual voltage mode LED lighting linear constant current driving circuit, which may further have the following features: when the switch switching circuit SW1 is turned off and the output voltage of the rectifier DB1 is equal to or greater than the sum of the operating voltages of the first LED unit LED1, the second LED unit LED2, and the third LED unit LED3, the first current source I1 is turned off, the third current source I0 is turned off, the second current source I2 is operated, and the first LED unit LED1, the second LED unit LED2, and the third LED unit LED3 are all turned on.
Further, the present invention provides a dual voltage mode LED lighting linear constant current driving circuit, which may further have the following features: the operating voltage of the second LED unit LED2 is less than the operating voltages of the first LED unit LED1, the third LED unit LED 3.
Further, the present invention provides a dual voltage mode LED lighting linear constant current driving circuit, which may further have the following features: when the switch switching circuit SW1 is turned on, the output voltage of the rectifier DB1 is greater than or equal to the operating voltage of the second LED unit LED2 and less than the operating voltages of the first LED unit LED1 and the third LED unit LED3, the second current source I2 is turned off, the first current source I1 and the third current source I0 are operated, the second LED unit LED2 is turned on, and the first LED unit LED1 and the third LED unit LED3 are turned off. When the switch switching circuit SW1 is turned on and the output voltage of the rectifier DB1 is greater than the operating voltages of the first LED unit LED1 and the third LED unit LED3, the first current source I1 and the second current source I2 operate, the third current source I0 is turned off, the first LED unit LED1 and the third LED unit LED3 are turned on, and the second LED unit LED2 is turned off.
In addition, the invention also provides a dual-voltage mode LED lighting linear constant current driving circuit, which comprises: a rectifier DB1, a switch switching circuit SW1, a first current source I1, a second current source I2, a first LED unit LED1, a second LED unit LED2, a third LED unit LED3, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, and a third current source I0. The input end of the rectifier is connected with alternating current. The anode of the first LED unit LED1 is connected to the positive output terminal of the rectifier DB 1. The cathode of the first LED unit LED1 is connected to the input terminal of the first current source I1 and the anode of the fifth diode D5, respectively. The output of the first current source I1 is connected to the negative output of the rectifier DB 1. An input end of the third current source I0 is connected to the cathode of the fifth diode D5, and an output end thereof is connected to the negative output end of the rectifier DB 1. The anode of the first diode and the cathode of the third diode are both connected with the cathode of a fifth diode D5. The anodes of the second LED unit LED2 are connected to the cathode of the first diode D1 and the cathode of the second diode D2, respectively. The cathodes of the second LED unit LED2 are connected to the anode of the third diode D3 and the anode of the fourth diode D4, respectively. The anode of the third LED unit LED3 is connected to the anode of the second diode D2 and the cathode of the fourth diode D4. The cathode of the third LED unit LED3 is connected to the input of a second current source I2. The output of the second current source I2 is connected to the negative output of the rectifier DB 1. One end of the switch switching circuit SW1 is connected to the positive output terminal of the rectifier DB 1. The other end of the switch switching circuit SW1 is connected to the anode of the third LED unit LED 3.
Further, the present invention provides a dual voltage mode LED lighting linear constant current driving circuit, which may further have the following features: when the switch switching circuit SW1 is turned off, the output voltage of the rectifier DB1 is equal to or greater than the operating voltage of the first LED unit LED1 and less than the sum of the operating voltages of the first LED unit LED1, the second LED unit LED2, and the third LED unit LED 3. The first current source I1 is operated and the first LED unit LED1 is turned on. The second current source I2 and the third current source I0 are turned off, and the second LED unit LED2 and the third LED unit LED3 are turned off.
Further, the present invention provides a dual voltage mode LED lighting linear constant current driving circuit, which may further have the following features: when the switch switching circuit SW1 is turned off and the output voltage of the rectifier DB1 is equal to or greater than the sum of the operating voltages of the first LED unit LED1, the second LED unit LED2, and the third LED unit LED3, the first current source I1 is turned off, the third current source I0 is turned off, the second current source I2 is operated, and the first LED unit LED1, the second LED unit LED2, and the third LED unit LED3 are all turned on.
Further, the present invention provides a dual voltage mode LED lighting linear constant current driving circuit, which may further have the following features: the operating voltage of the second LED unit LED2 is less than the operating voltages of the first LED unit LED1, the third LED unit LED 3.
Further, the present invention provides a dual voltage mode LED lighting linear constant current driving circuit, which may further have the following features: when the switch switching circuit SW1 is turned on, the output voltage of the rectifier DB1 is greater than or equal to the operating voltage of the second LED unit LED2 and less than the operating voltage of the first LED unit LED1, the first current source I1 and the second current source I2 are turned off, the third current source I0 is operated, the second LED unit LED2 is turned on, and the first LED unit LED1 and the third LED unit LED3 are turned off. When the switch switching circuit SW1 is turned on and the output voltage of the rectifier DB1 is greater than the operating voltage of the first LED unit LED1 and the operating voltage of the third LED unit LED3, the first current source I1 and the second current source I2 operate, the third current source I0 is turned off, the first LED unit LED1 and the third LED unit LED3 are turned on, and the second LED unit LED2 is turned off.
Drawings
Fig. 1 is a circuit diagram of a dual-voltage mode LED lighting linear constant current driving circuit according to a first embodiment.
Fig. 2 is a first circuit state diagram of the dual voltage mode LED lighting linear constant current driving circuit according to the first embodiment when the switch switching circuit SW1 is turned off.
Fig. 3 is a second circuit state diagram of the dual voltage mode LED lighting linear constant current driving circuit according to the first embodiment when the switch switching circuit SW1 is turned off.
Fig. 4 is a circuit state diagram of the dual voltage mode LED lighting linear constant current driving circuit according to the first embodiment when the switch switching circuit SW1 is closed.
Fig. 5 is a circuit diagram of a dual voltage mode LED lighting linear constant current driving circuit according to a second embodiment.
Fig. 6 is a first circuit state diagram of the dual voltage mode LED lighting linear constant current driving circuit of the second embodiment when the switch switching circuit SW1 is turned off.
Fig. 7 is a second circuit state diagram of the dual voltage mode LED lighting linear constant current driving circuit of the second embodiment when the switch switching circuit SW1 is turned off.
Fig. 8 is a first circuit state diagram of the dual voltage mode LED lighting linear constant current driving circuit according to the second embodiment when the switch switching circuit SW1 is closed.
Fig. 9 is a second circuit state diagram of the dual voltage mode LED lighting linear constant current driving circuit according to the second embodiment when the switch switching circuit SW1 is closed.
Fig. 10 is a circuit diagram of a dual voltage mode LED lighting linear constant current driving circuit according to a third embodiment.
Fig. 11 is a first circuit state diagram of the dual voltage mode LED lighting linear constant current driving circuit of the third embodiment when the switch switching circuit SW1 is turned off.
Fig. 12 is a second circuit state diagram of the dual voltage mode LED lighting linear constant current driving circuit of the third embodiment when the switch switching circuit SW1 is turned off.
Fig. 13 is a first circuit state diagram of the dual voltage mode LED lighting linear constant current driving circuit of the third embodiment when the switch switching circuit SW1 is closed.
Fig. 14 is a second circuit state diagram of the dual voltage mode LED lighting linear constant current driving circuit of the third embodiment when the switch switching circuit SW1 is closed.
Fig. 15 is a circuit diagram of a scheme in which a plurality of LED units and a plurality of current sources are used in combination.
Fig. 16 is a circuit diagram of an LED unit.
Detailed Description
The invention is further described below with reference to the following figures and specific examples.
Example one
Fig. 1 is a circuit diagram of a dual-voltage mode LED lighting linear constant current driving circuit according to a first embodiment.
As shown in fig. 1, the dual voltage mode LED lighting linear constant current driving circuit includes: a rectifier DB1, a switch switching circuit SW1, a first current source I1, a second current source I2, a first LED unit LED1, a second LED unit LED2, and a third LED unit LED 3.
The input end of the rectifier is connected with alternating current. The anode of the first LED unit LED1 is connected to the positive output terminal of the rectifier DB 1. The cathode of the first LED unit LED1 is connected to the anode of the second LED unit LED2 and the input terminal of the first current source I1. The output of the first current source I1 is connected to the negative output of the rectifier DB 1. The anode of the third LED unit LED3 is connected to the cathode of the second LED unit LED 2. The cathode of the third LED unit LED3 is connected to the input of a second current source I2. The output of the second current source I2 is connected to the negative output of the rectifier DB 1. One end of the switch switching circuit SW1 is connected to the positive output terminal of the rectifier DB 1. The other end of the switch switching circuit SW1 is connected to the cathode of the second LED unit LED2 and the anode of the third LED unit LED 3.
The operating voltage of the second LED unit LED2 is the smallest of the three LED units; in the low-voltage mode, the output voltage of the DB1 is greater than the working voltage of any one LED unit and less than the sum of the working voltages of any two LED units; in the high voltage mode, the output voltage of DB1 is greater than the sum of the operating voltages of the three LED units.
The operating voltage of the first LED unit LED1 is V1, the operating voltage of the second LED unit LED1 is V2, and the operating voltage of the third LED unit LED3 is V3. The low-voltage alternating current is Vlow, and the high-voltage alternating current is Vhigh.
In this embodiment, the following settings are set: V1-V3-110V, V2-70V. Vlow-120 Vac and Vhigh-270 Vac.
In the high-voltage (Vhigh ═ 270V) mode, the switch switching circuit SW1 is turned off by a control circuit or other means (control of on/off of the switch switching circuit SW1 belongs to the prior art).
As shown in fig. 2, in the high-voltage mode, the switch switching circuit SW1 is in an off state. When the output voltage of the rectifier DB1 is equal to or greater than the operating voltage of the first LED unit LED1 and less than the sum of the operating voltages of the first LED unit LED1, the second LED unit LED2 and the third LED unit LED3, that is, the output voltage of the rectifier DB1 is equal to or greater than 110V but lower than: when V1+ V2+ V3 is 290V, the first current source I1 operates, and the first LED unit LED1 is turned on. The second current source I2 is turned off, and the second LED unit LED2 and the third LED unit LED3 are not turned on.
As shown in fig. 3, in the high-voltage mode, the switch switching circuit SW1 is in an off state. When the output voltage of the rectifier DB1 is equal to or greater than the sum of the operating voltages of the first LED unit LED1, the second LED unit LED2, and the third LED unit LED3, that is, when the output voltage of the rectifier DB1 is equal to or greater than 290V, the first current source I1 is turned off, the second current source I2 is operated, and the first LED unit LED1, the second LED unit LED2, and the third LED unit LED3 are all turned on.
In the low voltage (Vlow) mode, the switch switching circuit SW1 is closed by a control circuit or other means.
As shown in fig. 4, in the low voltage (Vlow) mode, the switch switching circuit SW1 is in a closed state. When the output voltage of the rectifier DB1 is equal to or greater than the operating voltages of the first LED unit LED1 and the third LED unit LED3, that is, when the output voltage > -of the rectifier DB1 is 110V, the first current source I1 and the second current source I2 operate, the first LED unit LED1 and the third LED unit LED3 are turned on, and the second LED unit LED2 is turned off.
Example two
Fig. 5 is a circuit diagram of a dual voltage mode LED lighting linear constant current driving circuit according to the first embodiment.
As shown in fig. 5, the dual voltage mode LED lighting linear constant current driving circuit includes: a rectifier DB1, a switch switching circuit SW1, a first current source I1, a second current source I2, a first LED unit LED1, a second LED unit LED2, a third LED unit LED3, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, and a third current source I0.
The input end of the rectifier is connected with alternating current. The anode of the first LED unit LED1 is connected to the positive output terminal of the rectifier DB 1. The cathode of the first LED unit LED1 is connected to the input terminal of the first current source I1 and the anode of the fifth diode D5, respectively. The output of the first current source I1 is connected to the negative output of the rectifier DB 1. The input end of the third current source I0 is connected with the cathode of the fifth diode D5, and the output end is connected with the anode of the fifth diode. The anode of the first diode and the cathode of the third diode are both connected with the cathode of a fifth diode D5. The anodes of the second LED unit LED2 are connected to the cathode of the first diode D1 and the cathode of the second diode D2, respectively. The cathodes of the second LED unit LED2 are connected to the anode of the third diode D3 and the anode of the fourth diode D4, respectively. The anode of the third LED unit LED3 is connected to the anode of the second diode D2 and the cathode of the fourth diode D4. The cathode of the third LED unit LED3 is connected to the input of a second current source I2. The output of the second current source I2 is connected to the negative output of the rectifier DB 1. One end of the switch switching circuit SW1 is connected to the positive output terminal of the rectifier DB 1. The other end of the switch switching circuit SW1 is connected to the anode of the third LED unit LED 3.
Similarly, the operating voltage of the first LED unit LED1 is V1, the operating voltage of the second LED unit LED1 is V2, and the operating voltage of the third LED unit LED3 is V3. The low-voltage alternating current is Vlow, and the high-voltage alternating current is Vhigh.
In this embodiment, the following settings are set: V1-V3-110V, V2-70V. Vlow-120 Vac and Vhigh-270 Vac.
In the high-voltage (Vhigh ═ 270V) mode, the switch switching circuit SW1 is turned off by a control circuit or other means (control of on/off of the switch switching circuit SW1 belongs to the prior art).
As shown in fig. 6, in the high-voltage mode, the switch switching circuit SW1 is in an off state. When the output voltage of the rectifier DB1 is equal to or greater than the operating voltage of the first LED unit LED1 and less than the sum of the operating voltages of the first LED unit LED1, the second LED unit LED2 and the third LED unit LED3, that is, the output voltage of the rectifier DB1 is equal to or greater than 110V but lower than: when V1+ V2+ V3 is 290V, the first current source I1 operates, and the first LED unit LED1 is turned on; the second current source I2 and the third current source I0 are turned off, and the second LED unit LED2 and the third LED unit LED3 are turned off.
As shown in fig. 7, in the high-voltage mode, the switch switching circuit SW1 is in an off state. When the output voltage of the rectifier DB1 is equal to or greater than the sum of the operating voltages of the first LED unit LED1, the second LED unit LED2, and the third LED unit LED3, that is, when the output voltage of the rectifier DB1 is equal to or greater than 290V, the first current source I1 is turned off, the third current source I0 is turned off, the second current source I2 is operated, and the first LED unit LED1, the second LED unit LED2, and the third LED unit LED3 are all turned on.
In the low voltage (Vlow) mode, the switch switching circuit SW1 is closed by a control circuit or other means.
As shown in fig. 8, in the low voltage (Vlow) mode, the switch switching circuit SW1 is in a closed state. When the output voltage of the rectifier DB1 is greater than or equal to the operating voltage of the second LED unit LED2 and less than the operating voltages of the first LED unit LED1 and the third LED unit LED3, that is; when the output voltage > of the rectifier DB1 is 70V and <110V, the second current source I2 is turned off, the first current source I1 and the third current source I0 operate, the second LED unit LED2 is turned on, and the first LED unit LED1 and the third LED unit LED3 are not turned on;
as shown in fig. 9, in the low voltage (Vlow) mode, the switch switching circuit SW1 is in a closed state. When the output voltage of the rectifier DB1 is equal to or greater than the operating voltage of the first LED unit LED1 and the third LED unit LED3, that is, the output voltage > of the current transformer DB1 is 110V, the first current source I1 and the second current source I2 operate, the third current source I0 is turned off, the first LED unit LED1 and the third LED unit LED3 are turned on, and the second LED unit LED2 is turned off.
EXAMPLE III
Fig. 10 is a circuit diagram of a dual voltage mode LED lighting linear constant current driving circuit according to a second embodiment.
As shown in fig. 10, the dual voltage mode LED lighting linear constant current driving circuit includes: a rectifier DB1, a switch switching circuit SW1, a first current source I1, a second current source I2, a first LED unit LED1, a second LED unit LED2, a third LED unit LED3, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, and a third current source I0.
The input end of the rectifier is connected with alternating current. The anode of the first LED unit LED1 is connected to the positive output terminal of the rectifier DB 1. The cathode of the first LED unit LED1 is connected to the input terminal of the first current source I1 and the anode of the fifth diode D5, respectively. The output of the first current source I1 is connected to the negative output of the rectifier DB 1. An input end of the third current source I0 is connected to the cathode of the fifth diode D5, and an output end thereof is connected to the negative output end of the rectifier DB 1. The anode of the first diode and the cathode of the third diode are both connected with the cathode of a fifth diode D5. The anodes of the second LED unit LED2 are connected to the cathode of the first diode D1 and the cathode of the second diode D2, respectively. The cathodes of the second LED unit LED2 are connected to the anode of the third diode D3 and the anode of the fourth diode D4, respectively. The anode of the third LED unit LED3 is connected to the anode of the second diode D2 and the cathode of the fourth diode D4. The cathode of the third LED unit LED3 is connected to the input of a second current source I2. The output of the second current source I2 is connected to the negative output of the rectifier DB 1. One end of the switch switching circuit SW1 is connected to the positive output terminal of the rectifier DB 1. The other end of the switch switching circuit SW1 is connected to the anode of the third LED unit LED 3.
Similarly, the operating voltage of the first LED unit LED1 is V1, the operating voltage of the second LED unit LED1 is V2, and the operating voltage of the third LED unit LED3 is V3. The low-voltage alternating current is Vlow, and the high-voltage alternating current is Vhigh.
In this embodiment, the following settings are set: V1-V3-110V, V2-70V. Vlow-120 Vac and Vhigh-270 Vac.
In the high-voltage (Vhigh ═ 270V) mode, the switch switching circuit SW1 is turned off by a control circuit or other means (control of on/off of the switch switching circuit SW1 belongs to the prior art).
As shown in fig. 11, in the high-voltage mode, the switch switching circuit SW1 is in an off state. When the output voltage of the rectifier DB1 is equal to or greater than the operating voltage of the first LED unit LED1 and less than the sum of the operating voltages of the first LED unit LED1, the second LED unit LED2 and the third LED unit LED3, that is, the output voltage of the rectifier DB1 is equal to or greater than 110V but lower than: when V1+ V2+ V3 is 290V, the first current source I1 operates, and the first LED unit LED1 is turned on; the second current source I2 and the third current source I0 are turned off, and the second LED unit LED2 and the third LED unit LED3 are turned off.
As shown in fig. 12, in the high-voltage mode, the switch switching circuit SW1 is in an off state. When the output voltage of the rectifier DB1 is equal to or greater than the sum of the operating voltages of the first LED unit LED1, the second LED unit LED2, and the third LED unit LED3, that is, when the output voltage of the rectifier DB1 is equal to or greater than 290V, the first current source I1 is turned off, the third current source I0 is turned off, the second current source I2 is operated, and the first LED unit LED1, the second LED unit LED2, and the third LED unit LED3 are all turned on.
In the low voltage (Vlow) mode, the switch switching circuit SW1 is closed by a control circuit or other means.
As shown in fig. 13, in the low voltage (Vlow) mode, the switch switching circuit SW1 is in a closed state. When the output voltage of the rectifier DB1 is greater than or equal to the operating voltage of the second LED unit LED2 and less than the operating voltages of the first LED unit LED1 and the third LED unit LED3, that is; when the output voltage > of the rectifier DB1 is 70V and <110V, the first current source I1 and the second current source I2 are turned off, the third current source I0 operates, the second LED unit LED2 is turned on, and the first LED unit LED1 and the third LED unit LED3 are not turned on;
as shown in fig. 14, in the low voltage (Vlow) mode, the switch switching circuit SW1 is in a closed state. When the output voltage of the rectifier DB1 is equal to or greater than the operating voltage of the first LED unit LED1 and the third LED unit LED3, that is, the output voltage > of the current transformer DB1 is 110V, the first current source I1 and the second current source I2 operate, the third current source I0 is turned off, the first LED unit LED1 and the third LED unit LED3 are turned on, and the second LED unit LED2 is turned off.
The first LED unit, the second LED unit, the third LED unit, the first current source, the second current source, and the third current source may be split into a plurality of LED units or a plurality of corresponding current sources according to actual needs, and a scheme of using a plurality of LED units and a plurality of current sources in combination may utilize the prior art, for example, fig. 15.
The LED unit includes but not limited to LED lamp pearl, still can include other components and parts such as electric capacity, resistance, diode that are connected with the LED device, for example parallel capacitance can reduce the luminous stroboscopic of LED device, and the resistance is used for discharging for the electric capacity, and the diode is used for blocking the electric capacity and discharges to the circuit outside the LED device. Such as fig. 16.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention.
Claims (15)
1. The utility model provides a linear constant current drive circuit of dual voltage mode LED illumination which characterized in that: including, a rectifier DB1, a switch switching circuit SW1, a first current source I1, a second current source I2, a first LED unit LED1, a second LED unit LED2, and a third LED unit LED 3;
wherein, the input end of the rectifier is connected with alternating current;
the positive electrode of the first LED unit LED1 is connected with the positive output terminal of the rectifier DB 1; the cathode of the first LED unit LED1 is connected to the anode of the second LED unit LED2 and the input terminal of the first current source I1;
the output terminal of the first current source I1 is connected with the negative output terminal of the rectifier DB 1;
the anode of the third LED unit LED3 is connected to the cathode of the second LED unit LED 2; the cathode of the third LED unit LED3 is connected with the input end of a second current source I2;
the output terminal of the second current source I2 is connected with the negative output terminal of the rectifier DB 1;
one end of the switch switching circuit SW1 is connected to the positive output terminal of the rectifier DB 1;
the other end of the switch switching circuit SW1 is connected to the cathode of the second LED unit LED2 and the anode of the third LED unit LED 3.
2. The dual voltage mode LED lighting linear constant current drive circuit of claim 1, wherein:
when the switch switching circuit SW1 is turned off, and the output voltage of the rectifier DB1 is equal to or greater than the operating voltage of the first LED unit LED1 and less than the sum of the operating voltages of the first LED unit LED1, the second LED unit LED2 and the third LED unit LED3, the first current source I1 operates, and the first LED unit LED1 is turned on; the second current source I2 is turned off, and the second LED unit LED2 and the third LED unit LED3 are not turned on.
3. The dual voltage mode LED lighting linear constant current drive circuit of claim 1, wherein:
when the switch switching circuit SW1 is turned off, and the output voltage of the rectifier DB1 is equal to or greater than the sum of the operating voltages of the first LED unit LED1, the second LED unit LED2, and the third LED unit LED3, the first current source I1 is turned off, the second current source I2 is operated, and the first LED unit LED1, the second LED unit LED2, and the third LED unit LED3 are all turned on.
4. The dual voltage mode LED lighting linear constant current drive circuit of claim 1, wherein:
wherein the operating voltage of the second LED unit LED2 is less than the operating voltages of the first LED unit LED1 and the third LED unit LED 3.
5. The dual voltage mode LED lighting linear constant current drive circuit of claim 4, wherein:
when the switch switching circuit SW1 is turned on and the output voltage of the rectifier DB1 is greater than the operating voltages of the first LED unit LED1 and the third LED unit LED3, the first current source I1 and the second current source I2 operate, the first LED unit LED1 and the third LED unit LED3 are turned on, and the second LED unit LED2 is turned off.
6. The utility model provides a linear constant current drive circuit of dual voltage mode LED illumination which characterized in that: including a rectifier DB1, a switch switching circuit SW1, a first current source I1, a second current source I2, a first LED unit LED1, a second LED unit LED2, a third LED unit LED3, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, and a third current source I0;
wherein, the input end of the rectifier is connected with alternating current;
the positive electrode of the first LED unit LED1 is connected with the positive output terminal of the rectifier DB 1; the cathode of the first LED unit LED1 is connected to the input terminal of the first current source I1 and the anode of the fifth diode D5, respectively;
the output terminal of the first current source I1 is connected with the negative output terminal of the rectifier DB 1;
the input end of the third current source I0 is connected with the cathode of a fifth diode D5, and the output end of the third current source I0 is connected with the anode of the fifth diode;
the anode of the first diode and the cathode of the third diode are both connected with the cathode of a fifth diode D5;
the anode of the second LED unit LED2 is connected to the cathode of the first diode D1 and the cathode of the second diode D2, respectively; the cathode of the second LED unit LED2 is connected to the anode of the third diode D3 and the anode of the fourth diode D4, respectively;
the anode of the third LED unit LED3 is connected to the anode of the second diode D2 and the cathode of the fourth diode D4; the cathode of the third LED unit LED3 is connected with the input end of a second current source I2;
the output terminal of the second current source I2 is connected with the negative output terminal of the rectifier DB 1;
one end of the switch switching circuit SW1 is connected to the positive output terminal of the rectifier DB 1;
the other end of the switch switching circuit SW1 is connected to the anode of the third LED unit LED 3.
7. The dual voltage mode LED lighting linear constant current drive circuit of claim 6, wherein:
when the switch switching circuit SW1 is turned off, the output voltage of the rectifier DB1 is equal to or greater than the operating voltage of the first LED unit LED1 and is less than the sum of the operating voltages of the first LED unit LED1, the second LED unit LED2 and the third LED unit LED 3; the first current source I1 is operated, and the first LED unit LED1 is conducted; the second current source I2 and the third current source I0 are turned off, and the second LED unit LED2 and the third LED unit LED3 are turned off.
8. The dual voltage mode LED lighting linear constant current drive circuit of claim 6, wherein:
when the switch switching circuit SW1 is turned off, and the output voltage of the rectifier DB1 is equal to or greater than the sum of the operating voltages of the first LED unit LED1, the second LED unit LED2, and the third LED unit LED3, the first current source I1 is turned off, the third current source I0 is turned off, the second current source I2 is operated, and the first LED unit LED1, the second LED unit LED2, and the third LED unit LED3 are all turned on.
9. The dual voltage mode LED lighting linear constant current drive circuit of claim 6, wherein:
wherein the operating voltage of the second LED unit LED2 is less than the operating voltages of the first LED unit LED1 and the third LED unit LED 3.
10. The dual voltage mode LED lighting linear constant current drive circuit of claim 9, wherein:
when the switch switching circuit SW1 is turned on, the output voltage of the rectifier DB1 is greater than or equal to the operating voltage of the second LED unit LED2 and less than the operating voltages of the first LED unit LED1 and the third LED unit LED3, the second current source I2 is turned off, the first current source I1 and the third current source I0 are operated, the second LED unit LED2 is turned on, and the first LED unit LED1 and the third LED unit LED3 are not turned on;
when the switch switching circuit SW1 is turned on and the output voltage of the rectifier DB1 is equal to or greater than the operating voltages of the first LED unit LED1 and the third LED unit LED3, the first current source I1 and the second current source I2 operate, the third current source I0 is turned off, the first LED unit LED1 and the third LED unit LED3 are turned on, and the second LED unit LED2 is turned off.
11. The utility model provides a linear constant current drive circuit of dual voltage mode LED illumination which characterized in that: including a rectifier DB1, a switch switching circuit SW1, a first current source I1, a second current source I2, a first LED unit LED1, a second LED unit LED2, a third LED unit LED3, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, and a third current source I0;
wherein, the input end of the rectifier is connected with alternating current;
the positive electrode of the first LED unit LED1 is connected with the positive output terminal of the rectifier DB 1; the cathode of the first LED unit LED1 is connected to the input terminal of the first current source I1 and the anode of the fifth diode D5, respectively;
the output terminal of the first current source I1 is connected with the negative output terminal of the rectifier DB 1;
the input end of the third current source I0 is connected with the cathode of a fifth diode D5, and the output end is connected with the negative output end of the rectifier DB 1;
the anode of the first diode and the cathode of the third diode are both connected with the cathode of a fifth diode D5;
the anode of the second LED unit LED2 is connected to the cathode of the first diode D1 and the cathode of the second diode D2, respectively; the cathode of the second LED unit LED2 is connected to the anode of the third diode D3 and the anode of the fourth diode D4, respectively;
the anode of the third LED unit LED3 is connected to the anode of the second diode D2 and the cathode of the fourth diode D4; the cathode of the third LED unit LED3 is connected with the input end of a second current source I2;
the output terminal of the second current source I2 is connected with the negative output terminal of the rectifier DB 1;
one end of the switch switching circuit SW1 is connected to the positive output terminal of the rectifier DB 1;
the other end of the switch switching circuit SW1 is connected to the anode of the third LED unit LED 3.
12. The dual voltage mode LED lighting linear constant current drive circuit of claim 11, wherein:
when the switch switching circuit SW1 is turned off, the output voltage of the rectifier DB1 is equal to or greater than the operating voltage of the first LED unit LED1 and is less than the sum of the operating voltages of the first LED unit LED1, the second LED unit LED2 and the third LED unit LED 3; the first current source I1 is operated, and the first LED unit LED1 is conducted; the second current source I2 and the third current source I0 are turned off, and the second LED unit LED2 and the third LED unit LED3 are turned off.
13. The dual voltage mode LED lighting linear constant current drive circuit of claim 11, wherein:
when the switch switching circuit SW1 is turned off, and the output voltage of the rectifier DB1 is equal to or greater than the sum of the operating voltages of the first LED unit LED1, the second LED unit LED2, and the third LED unit LED3, the first current source I1 is turned off, the third current source I0 is turned off, the second current source I2 is operated, and the first LED unit LED1, the second LED unit LED2, and the third LED unit LED3 are all turned on.
14. The dual voltage mode LED lighting linear constant current drive circuit of claim 11, wherein:
wherein the operating voltage of the second LED unit LED2 is less than the operating voltages of the first LED unit LED1 and the third LED unit LED 3.
15. The dual voltage mode LED lighting linear constant current drive circuit of claim 14, wherein:
when the switch switching circuit SW1 is turned on, and the output voltage of the rectifier DB1 is greater than or equal to the operating voltage of the second LED unit LED2 and less than the operating voltages of the first LED unit LED1 and the third LED unit LED3, the first current source I1 and the second current source I2 are turned off, the third current source I0 is operated, the second LED unit LED2 is turned on, and the first LED unit LED1 and the third LED unit LED3 are not turned on;
when the switch switching circuit SW1 is turned on and the output voltage of the rectifier DB1 is equal to or greater than the operating voltages of the first LED unit LED1 and the third LED unit LED3, the first current source I1 and the second current source I2 operate, the third current source I0 is turned off, the first LED unit LED1 and the third LED unit LED3 are turned on, and the second LED unit LED2 is turned off.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911393940.0A CN111148319A (en) | 2019-12-30 | 2019-12-30 | Double-voltage-mode LED lighting linear constant-current driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911393940.0A CN111148319A (en) | 2019-12-30 | 2019-12-30 | Double-voltage-mode LED lighting linear constant-current driving circuit |
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| CN111148319A true CN111148319A (en) | 2020-05-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI730803B (en) * | 2020-06-05 | 2021-06-11 | 財團法人工業技術研究院 | Led driving circuit and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI730803B (en) * | 2020-06-05 | 2021-06-11 | 財團法人工業技術研究院 | Led driving circuit and method |
| US11632840B2 (en) | 2020-06-05 | 2023-04-18 | Industrial Technology Research Institute | LED driving circuit and method |
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