CN108617060B - Constant current bright driving circuit and device with wide input voltage - Google Patents
Constant current bright driving circuit and device with wide input voltage Download PDFInfo
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Abstract
The invention belongs to the technical field of electronic circuits, and provides a constant current bright driving circuit with wide input voltage and a device thereof, wherein the input voltage of a constant current output port is detected and a control signal is generated to control the opening and closing of the corresponding constant current output port; and generating corresponding output currents according to the reference voltage and the control signals aiming at different ranges of the input voltage. Therefore, constant current bright driving is realized, namely the lumen value of the LED lamp group does not change along with the change of the system voltage, and the problems that the conventional LED linear constant current electroless scheme cannot meet the requirements of wide voltage input and wide voltage application, the change of the system voltage can cause the change of the lumen value of the system LED lamp, and the system efficiency is further influenced are solved.
Description
Technical Field
The invention belongs to the technical field of electronic circuits, and particularly relates to a constant current bright driving circuit with wide input voltage and a device thereof.
Background
As a novel green light source, the LED lamp has advantages of strong brightness, low energy consumption, long life span, and the like, and thus is widely used in various fields. Because the LED lamp has fixed forward conduction voltage drop, the LED lamp can emit light only when the forward conduction voltage drop of the LED lamp is reached; and after the LED lamp is conducted, the forward conduction voltage drop is not obvious along with the current change of the LED lamp. In order to ensure that the LED lamp can operate normally and stably, it is necessary to control the current flowing through the LED. The LED linear constant current electroless solution is widely applied to a medium and small power LED linear constant current control system due to a simple system structure. At present, as shown in fig. 1 and 2, a common LED linear constant current scheme includes a reference voltage module, an output current control module, an output current setting resistor, and an LED lamp set. The output current control module is used for keeping the output current constant to be iout=vref/Re through the reference voltage Vref and the output current setting resistor Re provided by the reference voltage module. This application scheme has the following obvious disadvantages: the number of the LED lamps of the system load is strictly determined by the magnitude of the input voltage, and the magnitude of the output current can not be correspondingly changed corresponding to different system voltage ranges, so that constant lumen can not be realized.
In summary, the existing linear constant current electroless solution of the LED cannot meet the requirements of wide voltage input and wide voltage application, and there is a problem that the system voltage changes to cause the change of the lumen value of the LED lamp of the system, thereby affecting the system efficiency.
Disclosure of Invention
The invention aims to provide a constant current bright driving circuit with wide input voltage and a device thereof, and aims to solve the problems that the conventional LED linear constant current electroless scheme cannot meet the requirements of wide voltage input and wide voltage application, and the system voltage change can cause the change of the lumen value of a system LED lamp, thereby influencing the system efficiency.
The first aspect of the present invention provides a constant current bright driving circuit with wide input voltage, which is connected with an LED lamp group, the LED lamp group includes a plurality of LED lamps, and the constant current bright driving circuit includes:
the device comprises a reference voltage module, an input voltage detection module, an output current control module and an output current setting resistor;
the LED lamp comprises an input voltage detection module, an output current control module, a reference voltage module, an output current setting resistor and an output current control module, wherein a plurality of input ends of the input voltage detection module are respectively connected with a plurality of LED lamps, a plurality of input ends of the output current control module are respectively connected with a plurality of LED lamps, a plurality of feedback ends of the input voltage detection module are respectively connected with a plurality of controlled ends of the output current control module, the reference voltage module is respectively connected with a receiving end of the input voltage detection and a receiving end of the output current control module, and the output current setting resistor is connected with an output end of the output current control module;
the reference voltage module is used for providing reference voltages for the output current control module and the input voltage detection module; the input voltage detection module is used for detecting the input voltage of the constant current output port and generating a control signal so as to control the opening and closing of the corresponding constant current output port; the output current control module and the output current setting resistor are used for generating corresponding output currents according to different ranges of the input voltage and the reference voltage and the control signal.
The invention provides a constant current bright driving device with wide input voltage, which comprises an LED lamp group and a constant current bright driving circuit, wherein the LED lamp group comprises a plurality of LED lamps, and the constant current bright driving circuit comprises:
the device comprises a reference voltage module, an input voltage detection module, an output current control module and an output current setting resistor;
the LED lamp comprises an input voltage detection module, an output current control module, a reference voltage module, an output current setting resistor and an output current control module, wherein a plurality of input ends of the input voltage detection module are respectively connected with a plurality of LED lamps, a plurality of input ends of the output current control module are respectively connected with a plurality of LED lamps, a plurality of feedback ends of the input voltage detection module are respectively connected with a plurality of controlled ends of the output current control module, the reference voltage module is respectively connected with a receiving end of the input voltage detection and a receiving end of the output current control module, and the output current setting resistor is connected with an output end of the output current control module;
the reference voltage module is used for providing reference voltages for the output current control module and the input voltage detection module; the input voltage detection module is used for detecting the input voltage of the constant current output port and generating a control signal so as to control the opening and closing of the corresponding constant current output port; the output current control module and the output current setting resistor are used for generating corresponding output currents according to different ranges of the input voltage and the reference voltage and the control signal.
The constant current bright driving circuit and the device with wide input voltage provided by the invention are used for detecting the input voltage of a constant current output port and generating a control signal so as to control the opening and closing of the corresponding constant current output port; and generating corresponding output currents according to the reference voltage and the control signals aiming at different ranges of the input voltage. Therefore, constant current bright driving is realized, namely the lumen value of the LED lamp group does not change along with the change of the system voltage, and the problems that the conventional LED linear constant current electroless scheme cannot meet the requirements of wide voltage input and wide voltage application, the change of the system voltage can cause the change of the lumen value of the system LED lamp, and the system efficiency is further influenced are solved.
Drawings
Fig. 1 is a schematic block diagram of a linear constant current scheme of an LED according to the prior art.
Fig. 2 is a schematic block diagram of another linear constant current scheme of an LED according to the prior art.
Fig. 3 is a schematic block diagram of a constant current bright driving circuit with wide input voltage.
Fig. 4 is a circuit diagram of an output current control module and an output current setting resistor in a constant current light driving circuit with wide input voltage.
Fig. 5 is an exemplary circuit diagram of an input voltage detection module in a constant current bright driving circuit with a wide input voltage.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
According to the constant current bright driving circuit and the constant current bright driving device with the wide input voltage, the input voltage detection module generates a control signal after detecting the input voltage of the constant current output port and controls whether the corresponding constant current output port is started or not; the output current control module generates corresponding output current according to different input voltage ranges, so that constant lumen is realized, namely the lumen value of the LED lamp group cannot change along with the change of system voltage, and the problem that the change of the system voltage in the prior art can cause the change of the lumen value of the system LED lamp, thereby influencing the system efficiency is solved.
Fig. 3 shows a block structure of a constant current bright driving circuit with a wide input voltage according to the present invention, and for convenience of explanation, only the portions related to the present embodiment are shown, and the details are as follows:
the constant current bright driving circuit with wide input voltage is connected with the LED lamp set 100, and the LED lamp set comprises a plurality of LED lamps, and the constant current bright driving circuit comprises a reference voltage module 300, an input voltage detection module 400, an output current control module 200 and an output current setting resistor 500.
The input voltage detection module 400 has a plurality of input ends respectively connected to a plurality of LED lamps, the output current control module 200 has a plurality of input ends respectively connected to a plurality of LED lamps, the input voltage detection module 400 has a plurality of feedback ends respectively connected to a plurality of controlled ends of the output current control module 200, the reference voltage module 300 is respectively connected to the receiving end of the input voltage detection module 400 and the receiving end of the output current control module 200, and the output current setting resistor 500 is connected to the output end of the output current control module 200.
The reference voltage module 300 is used for providing a reference voltage to the output current control module 200 and the input voltage detection module 400; the input voltage detection module 400 detects the input voltage of the constant current output port and generates a control signal to control the opening and closing of the corresponding constant current output port; the output current control module 200 and the output current setting resistor 500 are used for generating corresponding output currents according to different ranges of input voltages and reference voltages and control signals.
As an embodiment of the invention, the reference voltage module 300 includes a first transmitting end, a second transmitting end, a third transmitting end, and a fourth transmitting end;
the first transmitting end and the second transmitting end are connected with an output current control module 200, and the third transmitting end and the fourth transmitting end are connected with an input voltage detection module 400. Of course, the reference voltage module 300 may also include more than four transmitting terminals, and the number of transmitting terminals may be set according to specific requirements. The reference voltages supplied from the reference voltage module 300 to the output current control module 200 and the input voltage detection module 400 may be the same or different. Of course, the number of the sending terminals is at least 4, but not limited to 4.
As an embodiment of the invention, the input voltage detection module 400 has m input terminals (m is a natural number not less than 2) and m output terminals, and m reference voltage receiving terminals corresponding thereto. For example:the first input end of the input voltage detection module 400 is connected with the output end of the first string of LED lamp groups and the input end of the second string of LED lamp groups, the second input end of the input voltage detection module 400 is connected with the output end of the second string of LED lamp groups and the input end of the third string of LED lamp groups, the first receiving end of the input voltage detection module 400 is connected with the third transmitting end of the reference voltage module 300, the second receiving end of the input voltage detection module 400 is connected with the fourth end of the reference voltage module 300 … …, the first feedback end of the input voltage detection module 400 is connected with the first controlled end of the output current control module 200, and the second feedback end of the input voltage detection module 400 is connected with the second controlled end of the output current control module 200 … …. The input voltage detection module 400 detects an input voltage of the constant current output port and generates a control signal to control whether the corresponding constant current output port is turned on or not. The first segment of the output current control module 200 is turned on and the remaining segments are turned off corresponding to the first segment input voltage; the second segment of the output current control module 200 is turned on, and the remaining segments are turned off … …, corresponding to the second segment input voltage, and the c-th segment of the output current control module 200 is turned on, and the remaining segments are turned off; wherein the upper limit value of the input voltage of the (c-1) th section is V c-1 The upper limit value of the input voltage of the c section is V c And V is c -V c-1 ＞xV LED (c is a natural number of not less than 2, x is a natural number of not less than 1, V LED A conduction voltage drop for the LED lamp).
As an embodiment of the invention, the output current control module 200 has a control inputs (a is a natural number not less than 2), a reference inputs, a outputs, and a corresponding current setting outputs. The first input end of the output current control module 200 is connected with the output end of the first string of LED lamp groups and the input end of the second string of LED lamp groups, the second input end of the output current control module 200 is connected with the output end of the second string of LED lamp groups and the input end of the third string of LED lamp groups, the first receiving end of the output current control module 200 is connected with the first transmitting end of the reference voltage module 300, and the second receiving end of the output current control module 200 is connected … with the second transmitting end of the reference voltage module 300… the first output terminal of the output current control module 200 is connected to the first input terminal of the output current setting resistor 500, the second output terminal of the output current control module 200 is connected to the second input terminal of the output current setting resistor 500, and the output terminal of the output current setting resistor 500 is grounded … …. When the system voltage reaches the sum of the forward conduction voltages of all the LED lamps in the first string, the first section of the output current control module 200 connected with the output end of the LED lamp group in the first string is conducted, the output current control module 200 and the output current setting resistor 500 generate corresponding output current through the voltage reference provided by the reference voltage module 300 and the control signal provided by the input voltage detection module 400When the input voltage of the system reaches the sum of the forward conducting voltages of all the LED lamps in the first two strings, the second section of the output current control module 200 connected with the output end of the second string of LED lamp group is conducted, and simultaneously the first output port is closed, the output current control module 200 and the output current setting resistor 500 generate corresponding output current through the voltage reference provided by the reference voltage module 300 and the control signal provided by the input voltage detection module 400>The same applies when the b-th segment (b is a natural number not less than 1) of the output current control module 200 is turned on.
Fig. 4 shows an example circuit of an output current control module and an output current setting resistor in a constant current light driving circuit with wide input voltage, and for convenience of explanation, only the parts related to the present embodiment are shown, and the details are as follows:
as an embodiment of the invention, the output current control module 200 includes a first operational amplifier A1, a second operational amplifier A2, a first switching tube M1 and a second switching tube M2.
The non-inverting input end of the first operational amplifier A1 is connected with the first transmitting end of the reference voltage module 300, the output end of the first operational amplifier A1 is connected with the controlled end of the first switching tube M1, the input end of the first switching tube M1 is the first input end of the output current control module 200, and the inverting input end of the first operational amplifier A1 is commonly connected with the output end of the first switching tube M1 and is used as the first output end of the output current control module 200; the non-inverting input end of the second operational amplifier A2 is connected with the second transmitting end of the reference voltage module 300, the output end of the second operational amplifier A2 is connected with the controlled end of the second switching tube M2, the input end of the second switching tube M2 is the second input end of the output current control module 200, and the inverting input end of the second operational amplifier A2 is commonly connected with the output end of the second switching tube M2 and is used as the second output end of the output current control module 200. Of course, the number of operational amplifiers is at least 2, but not limited to 2; the number of switching tubes is at least 2, but not limited to 2.
Of course, the output current control module 200 may include c operational amplifiers and c N-channel MOS transistors (c is a natural number not less than 2 and equal to the number of the constant current segments). The first operational amplifier A1 is controlled by a first feedback end of the input voltage detection module 400, the non-inverting input end of the first operational amplifier A1 is connected with a first transmitting end of the reference voltage module 300, the inverting input end of the first operational amplifier A1 is connected with a source electrode of the MOS tube M1, and the output end of the first operational amplifier A1 is connected with a grid electrode of the MOS tube M1; the drain electrode of the MOS tube M1 is used as an input end OUT1 of the output current control module 200, and the source electrode of the MOS tube M1 is used as an output end of the output current control module 200; the second operational amplifier A2 is controlled by a second feedback end of the input voltage detection module 400, the non-inverting input end of the second operational amplifier A2 is connected with a second transmitting end of the reference voltage module 300, the inverting input end of the second operational amplifier A2 is connected with the source electrode of the MOS tube M2, and the output end of the second operational amplifier A2 is connected with the grid electrode of the MOS tube M2; the drain electrode of the MOS tube M2 is used as an input end OUT2 of the output current control module 200, the source electrode of the MOS tube M2 is used as an output end … … of the output current control module 200, whether the operational amplifier Ac works or not is controlled by a feedback end c of the input voltage detection module 400, the non-inverting input end of the operational amplifier Ac is connected with a c-th transmitting end of the reference voltage module 300, the inverting input end of the operational amplifier Ac is connected with the source electrode of the MOS tube Mc, and the output end of the operational amplifier Ac is connected with the grid electrode of the MOS tube Mc; the drain of the MOS tube Mc is used as the input end OUTc of the output current control module 200, and the source of the MOS tube Mc is used as the output end of the output current control module 200.
Specifically, the first switching transistor M1 is an N-type field effect transistor or a triode;
the grid electrode, the drain electrode and the source electrode of the N-type field effect transistor are respectively a controlled end, an input end and an output end of the first switch tube M1;
the base, collector and emitter of the triode are the controlled end, input end and output end of the first switch tube M1 respectively.
Specifically, the second switching transistor M2 is an N-type field effect transistor or a triode;
the grid electrode, the drain electrode and the source electrode of the N-type field effect transistor are respectively a controlled end, an input end and an output end of the second switching tube M2;
the base, collector and emitter of the triode are the controlled end, input end and output end of the second switch tube M2 respectively.
As an embodiment of the present invention, the output current setting resistor 500 includes a first current limiting resistor R5 and a second current limiting resistor R6,
the first end of the first current limiting resistor R5 is commonly connected with the first end of the second current limiting resistor R6 and the first output end of the output current control module 200, the second end of the second current limiting resistor R6 is connected with the second output end of the output current control module 200, and the second end of the first current limiting resistor R5 is grounded.
Fig. 5 shows an exemplary circuit of an input voltage detection module in a constant current bright driving circuit with a wide input voltage, and for convenience of explanation, only the parts related to the present embodiment are shown, and the details are as follows:
as an embodiment of the invention, the input voltage detection module 400 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a third operational amplifier A3, and a fourth operational amplifier A4.
The first end of the first resistor R1 is connected with the LED lamp group 100, the second end of the first resistor R1 is commonly connected with the first end of the second resistor R2 and the normal phase input end of the third operational amplifier A3, the second end of the second resistor R2 is grounded, the output end of the third operational amplifier A3 is connected with the output current control module 200, and the reverse phase input end of the third operational amplifier A3 is connected with the third transmitting end of the reference voltage module 300; the first end of the third resistor R3 is connected to the LED lamp set 100, the second end of the third resistor R3 is commonly connected to the first end of the fourth resistor R4 and the non-inverting input end of the fourth operational amplifier A4, the second end of the fourth resistor R4 is grounded, the output end of the fourth operational amplifier A4 is connected to the output current control module 200, and the inverting input end of the fourth operational amplifier A4 is connected to the fourth transmitting end of the reference voltage module 300.
Of course, the input voltage detection module includes m comparators (m is a natural number not less than 2) and 2m resistors. The first end of the first resistor R1 is connected with the output end of the first string of LED lamp groups and the input end of the second string of LED lamp groups, the second end of the first resistor R1 is connected with the non-inverting input end of the third operational amplifier A3 and the first end of the second resistor R2, the inverting input end of the third operational amplifier A3 is connected with the third transmitting end of the reference voltage module 300, the output end of the third operational amplifier A3 is connected with the first controlled end of the output current control module 200, and the second end of the second resistor R2 is grounded; the first end of the third resistor R3 is connected to the output end of the second string of LED lamp groups and the input end of the third string of LED lamp groups, the second end of the third resistor R3 is connected to the non-inverting input end of the fourth operational comparator A4 and the first end of the fourth resistor R4, the inverting input end of the fourth operational comparator A4 is connected to the fourth transmitting end of the reference voltage module 300, the output end of the fourth operational comparator A4 is connected to the second controlled end of the output current control module 200, and the second end of the fourth resistor R4 is grounded … … and so on.
Specifically, corresponding to the first segment input voltage V 1 The voltage at the non-inverting input terminal of the third operational amplifier A3 isThe voltage at the non-inverting input of the third operational amplifier A3 is not less than the voltage at the inverting input, i.eThird operational amplifierThe output signal EN1 of the controller A3 is high, which turns on the first segment of the output current control module 200. At this time, the voltage at the non-inverting input terminal of the fourth operational comparator A4 is smaller than the voltage at the inverting input terminal, and the output signal EN2 is at a low level, so that the second stage of the output current control module 200 is turned off.
The invention also provides a constant current bright driving device with wide input voltage, which comprises an LED lamp group and a constant current bright driving circuit, wherein the LED lamp group comprises a plurality of LED lamps, and the constant current bright driving circuit is as described above.
The working principle of the constant current bright driving circuit and the device with wide input voltage is described below with reference to fig. 3-5:
the output current control module 200 and the first current limiting resistor R5 generate the output current according to the voltage reference Vref1 provided by the reference voltage module 300 and the control signal provided by the input voltage detection module 400:
corresponding to the second stage input voltage V 2 The voltage difference between the OUT1 port and the OUT2 port is:
ΔV out ＝V out1 -V out2 ≥V LED
wherein V is LED And the voltage drop is conducted for the LED lamp group. At this time, the enable signal in the third operational amplifier A3 disables the third operational amplifier A3. The voltage at the non-inverting input terminal of the fourth operational amplifier A4 isThe voltage at the non-inverting input of the fourth operational amplifier A4 is not less than the voltage at the inverting input, i.e.)>The output signal EN2 of the fourth operational amplifier A4 is high, so that the second stage of the output current control module 200 is turned on. Due to the bases of the first and second sections of the output current control module 200Quasi-voltage satisfies V ref2 ＞V ref1 The first segment of the output current control module 200 is turned off at this time.
The output current control module 200, the first current limiting resistor R5 and the second current limiting resistor R6 generate the output current by the voltage reference Vref2 provided by the reference voltage module 300 and the control signal provided by the input voltage detection module 400, where:
to maintain constant lumen
Assume that the first current limiting resistor R5 and the second current limiting resistor R6 satisfy the following relationship:
R 2 ＝nR 1
the voltage at node a is:
therefore, reference voltage V ref1 、V ref2 The following relationship should be satisfied:
to ensure V ref2 ＞V ref1 The method comprises the following steps:
i.e.
In summary, corresponding to different system voltage ranges, the output current will change accordingly, so that the lumen value of the system LED lamp set is kept constant, thereby realizing wide voltage input and wide voltage application constant current bright driving.
In summary, the constant current bright driving circuit and the device with wide input voltage provided by the embodiment of the invention are used for controlling the opening and closing of the corresponding constant current output port by detecting the input voltage of the constant current output port and generating a control signal; and generating corresponding output currents according to the reference voltage and the control signals aiming at different ranges of the input voltage. Therefore, constant current bright driving is realized, namely the lumen value of the LED lamp group does not change along with the change of input voltage, and the problems that the conventional LED linear constant current electroless scheme cannot meet the requirements of wide voltage input and wide voltage application, and the system efficiency is affected due to the fact that the system voltage changes to cause the change of the lumen value of the system LED lamp are solved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The utility model provides a bright drive circuit of constant current of wide input voltage, is connected with LED banks, LED banks includes a plurality of LED lamps, its characterized in that, bright drive circuit of constant current includes:
the device comprises a reference voltage module, an input voltage detection module, an output current control module and an output current setting resistor;
the LED lamp comprises an input voltage detection module, an output current control module, a reference voltage module, an output current setting resistor and an output current control module, wherein a plurality of input ends of the input voltage detection module are respectively connected with a plurality of LED lamps, a plurality of input ends of the output current control module are respectively connected with a plurality of LED lamps, a plurality of feedback ends of the input voltage detection module are respectively connected with a plurality of controlled ends of the output current control module, the reference voltage module is respectively connected with a receiving end of the input voltage detection and a receiving end of the output current control module, and the output current setting resistor is connected with an output end of the output current control module;
the reference voltage module is used for providing reference voltages for the output current control module and the input voltage detection module; the input voltage detection module is used for detecting the input voltage of the constant current output port and generating a control signal so as to control the opening and closing of the corresponding constant current output port; the output current control module and the output current setting resistor are used for generating corresponding output currents according to different ranges of the input voltage and the reference voltage and the control signal.
2. The constant current bright driving circuit of claim 1, wherein the reference voltage module includes a first transmitting terminal, a second transmitting terminal, a third transmitting terminal, and a fourth transmitting terminal;
the first transmitting end and the second transmitting end are connected with the output current control module, and the third transmitting end and the fourth transmitting end are connected with the input voltage detection module.
3. The constant current bright drive circuit of claim 2, wherein the output current control module comprises:
the first operational amplifier, the second operational amplifier, the first switching tube and the second switching tube;
the positive-phase input end of the first operational amplifier is connected with the first transmitting end, the output end of the first operational amplifier is connected with the controlled end of the first switching tube, the input end of the first switching tube is a first input end of the output current control module, and the negative-phase input end of the first operational amplifier is commonly connected with the output end of the first switching tube and serves as a first output end of the output current control module; the positive-phase input end of the second operational amplifier is connected with the second transmitting end, the output end of the second operational amplifier is connected with the controlled end of the second switching tube, the input end of the second switching tube is the second input end of the output current control module, and the negative-phase input end of the second operational amplifier is connected with the output end of the second switching tube in a sharing way and is used as the second output end of the output current control module.
4. The constant current bright driving circuit according to claim 2, wherein the input voltage detecting module includes:
the first resistor, the second resistor, the third resistor, the fourth resistor, the third operational amplifier and the fourth operational amplifier;
the first end of the first resistor is connected with the LED lamp group, the second end of the first resistor is commonly connected with the first end of the second resistor and the normal phase input end of the third operational amplifier, the second end of the second resistor is grounded, the output end of the third operational amplifier is connected with the output current control module, and the reverse phase input end of the third operational amplifier is connected with the third transmitting end; the first end of the third resistor is connected with the LED lamp group, the second end of the third resistor is commonly connected with the first end of the fourth resistor and the normal phase input end of the fourth operational amplifier, the second end of the fourth resistor is grounded, the output end of the fourth operational amplifier is connected with the output current control module, and the reverse phase input end of the fourth operational amplifier is connected with the fourth transmitting end.
5. The constant current light driving circuit according to claim 3, wherein the output current setting resistor includes a first current limiting resistor and a second current limiting resistor,
the first end of the first current limiting resistor is commonly connected with the first end of the second current limiting resistor and the first output end of the output current control module, the second end of the second current limiting resistor is connected with the second output end of the output current control module, and the second end of the first current limiting resistor is grounded.
6. The utility model provides a wide input voltage's bright drive arrangement of constant current, includes LED banks and bright drive circuit of constant current, LED banks includes a plurality of LED lamps, its characterized in that, bright drive circuit of constant current includes:
the device comprises a reference voltage module, an input voltage detection module, an output current control module and an output current setting resistor;
the LED lamp comprises an input voltage detection module, an output current control module, a reference voltage module, an output current setting resistor and an output current control module, wherein a plurality of input ends of the input voltage detection module are respectively connected with a plurality of LED lamps, a plurality of input ends of the output current control module are respectively connected with a plurality of LED lamps, a plurality of feedback ends of the input voltage detection module are respectively connected with a plurality of controlled ends of the output current control module, the reference voltage module is respectively connected with a receiving end of the input voltage detection and a receiving end of the output current control module, and the output current setting resistor is connected with an output end of the output current control module;
the reference voltage module is used for providing reference voltages for the output current control module and the input voltage detection module; the input voltage detection module is used for detecting the input voltage of the constant current output port and generating a control signal so as to control the opening and closing of the corresponding constant current output port; the output current control module and the output current setting resistor are used for generating corresponding output currents according to different ranges of the input voltage and the reference voltage and the control signal.
7. The constant current drive apparatus according to claim 6, wherein the reference voltage module includes a first transmitting terminal, a second transmitting terminal, a third transmitting terminal, and a fourth transmitting terminal;
the first transmitting end and the second transmitting end are connected with the output current control module, and the third transmitting end and the fourth transmitting end are connected with the input voltage detection module.
8. The constant current light driving device according to claim 7, wherein the output current control module includes:
the first operational amplifier, the second operational amplifier, the first switching tube and the second switching tube;
the positive-phase input end of the first operational amplifier is connected with the first transmitting end, the output end of the first operational amplifier is connected with the controlled end of the first switching tube, the input end of the first switching tube is a first input end of the output current control module, and the negative-phase input end of the first operational amplifier is commonly connected with the output end of the first switching tube and serves as a first output end of the output current control module; the positive-phase input end of the second operational amplifier is connected with the second transmitting end, the output end of the second operational amplifier is connected with the controlled end of the second switching tube, the input end of the second switching tube is the second input end of the output current control module, and the negative-phase input end of the second operational amplifier is connected with the output end of the second switching tube in a sharing way and is used as the second output end of the output current control module.
9. The constant current light driving device according to claim 7, wherein the input voltage detection module includes:
the first resistor, the second resistor, the third resistor, the fourth resistor, the third operational amplifier and the fourth operational amplifier;
the first end of the first resistor is connected with the LED lamp group, the second end of the first resistor is commonly connected with the first end of the second resistor and the normal phase input end of the third operational amplifier, the second end of the second resistor is grounded, the output end of the third operational amplifier is connected with the output current control module, and the reverse phase input end of the third operational amplifier is connected with the third transmitting end; the first end of the third resistor is connected with the LED lamp group, the second end of the third resistor is commonly connected with the first end of the fourth resistor and the normal phase input end of the fourth operational amplifier, the second end of the fourth resistor is grounded, the output end of the fourth operational amplifier is connected with the output current control module, and the reverse phase input end of the fourth operational amplifier is connected with the fourth transmitting end.
10. The constant current light driving device according to claim 8, wherein the output current setting module includes a first current limiting resistor and a second current limiting resistor,
the first end of the first current limiting resistor is commonly connected with the first end of the second current limiting resistor and the first output end of the output current control module, the second end of the second current limiting resistor is connected with the second output end of the output current control module, and the second end of the first current limiting resistor is grounded.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102280089A (en) * | 2011-08-18 | 2011-12-14 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) backlight driving method and circuit and liquid crystal display device |
| CN203279254U (en) * | 2013-03-28 | 2013-11-06 | 杭州士兰微电子股份有限公司 | LED driving circuit and constant current control circuit thereof |
| KR20140036750A (en) * | 2012-09-18 | 2014-03-26 | 서울반도체 주식회사 | Ac led drive ic having adaptive active cooler drive circuit and control method using the same |
| CN105392261A (en) * | 2015-12-14 | 2016-03-09 | 深圳市明微电子股份有限公司 | Linear constant-power and constant-current LED drive circuit |
| CN107071982A (en) * | 2017-05-19 | 2017-08-18 | 深圳市晟碟半导体有限公司 | LED drive device and its invariable power light adjusting circuit, light-dimming method |
| CN107529242A (en) * | 2016-06-22 | 2017-12-29 | 华润矽威科技（上海）有限公司 | A kind of LED drive circuit and method of equalization efficiency and power factor |
| KR20180032698A (en) * | 2016-09-05 | 2018-04-02 | 주식회사 에이디텍 | Led lighting apparatus |
| CN208572492U (en) * | 2018-06-27 | 2019-03-01 | 深圳市明微电子股份有限公司 | A kind of bright driving circuit of the constant current of wide input voltage and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130044272A1 (en) * | 2011-08-18 | 2013-02-21 | Xinming Gao | LED Backlight Driving Method, LED Backlight Driving Circuit and Liquid Crystal Display Device |
-
2018
- 2018-06-27 CN CN201810677924.3A patent/CN108617060B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102280089A (en) * | 2011-08-18 | 2011-12-14 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) backlight driving method and circuit and liquid crystal display device |
| KR20140036750A (en) * | 2012-09-18 | 2014-03-26 | 서울반도체 주식회사 | Ac led drive ic having adaptive active cooler drive circuit and control method using the same |
| CN203279254U (en) * | 2013-03-28 | 2013-11-06 | 杭州士兰微电子股份有限公司 | LED driving circuit and constant current control circuit thereof |
| CN105392261A (en) * | 2015-12-14 | 2016-03-09 | 深圳市明微电子股份有限公司 | Linear constant-power and constant-current LED drive circuit |
| CN107529242A (en) * | 2016-06-22 | 2017-12-29 | 华润矽威科技（上海）有限公司 | A kind of LED drive circuit and method of equalization efficiency and power factor |
| KR20180032698A (en) * | 2016-09-05 | 2018-04-02 | 주식회사 에이디텍 | Led lighting apparatus |
| CN107071982A (en) * | 2017-05-19 | 2017-08-18 | 深圳市晟碟半导体有限公司 | LED drive device and its invariable power light adjusting circuit, light-dimming method |
| CN208572492U (en) * | 2018-06-27 | 2019-03-01 | 深圳市明微电子股份有限公司 | A kind of bright driving circuit of the constant current of wide input voltage and device |
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|---|---|
| CN108617060A (en) | 2018-10-02 |
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