CN111065184B - Hot-pluggable LED driving power supply and control method thereof - Google Patents
Hot-pluggable LED driving power supply and control method thereof Download PDFInfo
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- CN111065184B CN111065184B CN201911294645.XA CN201911294645A CN111065184B CN 111065184 B CN111065184 B CN 111065184B CN 201911294645 A CN201911294645 A CN 201911294645A CN 111065184 B CN111065184 B CN 111065184B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
Abstract
The invention discloses a hot-pluggable LED driving power supply and a control method thereof, wherein the hot-pluggable LED driving power supply comprises the following steps: the LED driving circuit comprises a main circuit, a switch tube S2, a main control circuit, a sub control circuit and a resistor R1, wherein the main circuit comprises a switch tube S1, and the main circuit processes energy conversion of a power level under the control of the main control circuit 2 and supplies the energy conversion to an LED load 8; the input end of the main control circuit 2 is connected with the output end of the main circuit 1, the control end of the main control circuit 2 is connected with the sub-control circuit 3, and the output end of the main control circuit 2 is connected with the control end of the switch tube S1; the switching tube S2 is connected in series between the main circuit 1 and the LED load 8, and the control end of the switching tube S2 is connected with the sub-control circuit 3; the resistor R1 is connected in parallel with the switch tube S2. According to the invention, the switch tube S2, the resistor R1 and the sub-control circuit are added at the output end of the driving power supply, so that the problems that the LED lamp load is pulled out under the charged condition and is reconnected under the charged condition, and the lamp flashes because the no-load voltage output by the driving power supply is greater than the voltage of the LED lamp are avoided.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a hot-pluggable LED driving power supply and a control method thereof.
Background
The drive power supply output typically carries an LED lamp load, and in existing drive power supply designs, the no-load voltage of the drive power supply is greater than the voltage of the LED lamp, thereby lighting the LED lamp. LED lamp marketization has successfully lighted each bridge, every road, every mansion, even has gone into family's family, and the visual effect of LED lamp will more and more be appreciated from this, in the real use, can appear that LED lamp load pulls out under the electrified circumstances and under electrified circumstances and insert, because drive power supply control circuit voltage is greater than LED lamp voltage, will appear the problem that the lamp dodged in the twinkling of an eye and influence visual effect. Therefore, an LED driving power source is urgently needed, so that the problem of lamp flash cannot occur when the LED lamp is pulled out under the condition of electrification.
For example, a "split LED lamp and its driving power plug protection circuit" disclosed in the chinese patent literature, its publication No. CN103037585B, published 12/17/2014, comprises a rectifying and filtering circuit connected with a driving power supply, a voltage dividing resistor R1, a voltage dividing resistor R2, a voltage dividing resistor R3, a resistor R4 and a voltage comparison circuit, the voltage dividing resistor R1 is connected between the output end of the rectifying and filtering circuit and the first end of the voltage dividing resistor R2, the voltage-dividing resistor R2 and the voltage-dividing resistor R3 are connected to the first end of the resistor R4, the second end of the resistor R4 is connected with the non-inverting input end of a current comparison circuit, the output level of the voltage comparison circuit and the output level of the current comparison circuit jointly control the feedback current output by the feedback circuit of the driving power supply, so that the PWM control circuit of the driving power supply adjusts the output voltage of the transformer T1 of the driving power supply according to the feedback current; the drive power supply plug protection circuit comprises: the input end and the output end of the voltage division module are respectively connected with the output end of the rectification filter circuit and the inverted input end of the voltage comparison circuit, and the voltage division module is used for carrying out voltage division processing on the direct current output by the rectification filter circuit so as to reduce the voltage of the direct current and outputting a divided direct current; the input end of the voltage detection module is connected with the first end of the resistor R4 and is used for detecting the voltage of the first end of the resistor R4 and correspondingly outputting a control level signal according to the detection result; the voltage division control module is used for adjusting the voltage of the divided voltage direct current according to the control level signal so as to correspondingly adjust the output level of the voltage comparison circuit; the voltage detection module includes: the circuit comprises a resistor R13, a resistor R14, a comparator, a resistor R15 and a capacitor C2; the first end of the resistor R13 is the input end of the voltage detection module, the second end of the resistor R13 and the first end of the resistor R14 are connected to the non-inverting input end of the comparator, the second end of the resistor R14 and the inverting input end of the comparator are connected to the ground, the positive power source end and the negative power source end of the comparator are connected to the direct current power source and the ground respectively, the output end of the comparator is the output end of the voltage detection module, the resistor R15 is connected between the output end of the comparator and the first end of the capacitor C2, and the second end of the capacitor C2 is connected to the inverting input end of the comparator. The voltage detection module and the partial pressure control module are used for detecting and controlling the voltage transmitted to the LED by the LED driving power supply, but the problem that the output no-load voltage of the driving power supply is greater than the voltage of the LED lamp to cause lamp flash when the LED lamp is pulled down under the electric condition is still not solved
Disclosure of Invention
The invention mainly solves the problem that the prior art can not solve the problem that the LED lamp is pulled out and then plugged under the condition of electrification to cause lamp flashing; the LED driving power supply capable of hot plugging and the control method thereof are provided, and the problem of lamp flash caused by the fact that the driving power supply outputs no-load voltage which is greater than the voltage of an LED lamp when the LED lamp is pulled out under the condition of electrification and reconnected under the condition of electrification is solved.
The technical problem of the invention is mainly solved by the following technical scheme: a hot-pluggable LED driving power supply comprises a main circuit, a switch tube S2, a main control circuit, a sub-control circuit and a resistor R1, wherein the main circuit comprises a switch tube S1, and the main circuit processes energy conversion of a power level under the control of the main control circuit and supplies the energy conversion to an LED load; the input end of the main control circuit is connected with the output end of the main circuit and is used for sampling the output voltage of the main circuit, the control end of the main control circuit is connected with the sub-control circuit, and the output end of the main control circuit is connected with the control end of the switch tube S1; the switch tube S2 is connected in series between the main circuit and the LED load, and the control end of the switch tube S2 is connected with the sub-control circuit; the resistor R1 is connected in parallel with the switch tube S2; the sub-control circuit comprises a first sampling end, a second sampling end, a first output end and a second output end, the first sampling end samples the output voltage of the main circuit, the second sampling end samples the voltage of the resistor R1, the first output end is connected with the main control circuit, the second output end is connected with the switch tube S2, and when the sub-control circuit detects that the output voltage of the main circuit exceeds a third preset value, the sub-control circuit controls the switch tube S2 to be switched off; when the voltage of the resistor R1 is detected to exceed a fourth preset value and the output voltage of the main circuit is detected to exceed a third preset value, the main control circuit is controlled to reduce the output voltage of the main circuit and control the switch tube S2 to be closed. The output voltage V0 of the main circuit is detected through the sub control circuit, the switch tube S2 is controlled to be turned off, the switch tube S2 is controlled to be closed through the voltage of the detection resistor R1, the connection between the main circuit and the LED load is turned on and off through controlling the on and off of the switch tube S2, and when the LED load is pulled out under the condition of electrification, the connection between the output of the main circuit and the LED load is turned off; when the LED load is reconnected and plugged under the condition of electrification, the sub-control circuit controls the main control circuit, the main control circuit controls the main circuit to firstly reduce the no-load voltage output by the main circuit, then the connection between the output of the main circuit and the LED load is closed, and then the no-load voltage output by the main circuit is regulated back, so that the problem that the LED lamp is plugged under the condition of electrification, and the lamp flashes instantly due to the fact that the no-load voltage of the driving power supply is larger than the voltage of the LED lamp is avoided.
Preferably, the resistance of the resistor R1 is several times or ten times the LED load resistance. By setting the impedance of the resistor R1 to be several times or tens of times of the impedance of the LED load, the sub-control circuit can better detect the condition of the LED load when detecting the voltage of the resistor R1, and the no-load voltage output by the main circuit can be conveniently adjusted.
Preferably, the main control circuit comprises a driving circuit, a photoelectric coupling circuit and a voltage ring, the input end of the voltage ring is connected with the output end of the main circuit, the output end of the voltage ring is connected with the input end of the driving circuit, and the output end of the driving circuit is connected with the switching tube S1 through the photoelectric coupling circuit. The rated value of the main circuit output voltage V0 is set through the voltage ring pair, the output voltage V0 of the main circuit is regulated, the drive circuit and the main circuit are electrically isolated through the photoelectric coupling circuit, and the circuit is effectively protected.
Preferably, the voltage loop comprises an operational amplifier US1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1 and a switch tube S3, the non-inverting input of the operational amplifier US1 inputs a first voltage reference signal Vref1, one end of the resistor R3 is connected with the positive output terminal of the main circuit, the other end of the resistor R3 is connected with one end of the resistor R4, the other end of the resistor R4 is connected with the negative phase input end of the operational amplifier US1, the first end of the capacitor C1 and one end of the resistor R5, the second end of the capacitor C1 is connected with one end of a resistor R2, the output end of the operational amplifier US1 is respectively connected with the other end of the resistor R2 and the input end of the driving circuit, the other end of the R5 is grounded, the switch tube S3 is connected in parallel to the resistor R3, and the control end of the switch tube S3 is connected with the sub-control circuit as the control end of the main control circuit. The input signal of the negative phase end of the operational amplifier US1 is divided by a resistor R3, a resistor R4 and a resistor R5 to the output voltage Vo of the main circuit, the operational amplifier US1 carries out differential operation amplification on the input signal of the negative phase end and a first voltage reference signal Vref1 of the positive phase end through a compensation network consisting of a resistor R2 and a capacitor C1 and outputs a feedback signal to the driving circuit, the driving circuit outputs a driving signal through a photocoupler circuit to control the on-off of a switch tube S1 of the main circuit, the output voltage of the main circuit is controlled through the on-off of a switch tube S1, the rated value of the output voltage V0 of the main circuit is set by the first voltage reference signal Vref1, the resistor R3, the resistor R4 and the resistor R5, when the switch tube S3 receives the output signal of the sub-control circuit to close the output voltage, the output voltage V0 of the main circuit is reduced by a set value, and the first voltage reference signal Vref1 of the input end of the operational amplifier US1 and the input signal Vref 36 of the negative phase end are input end of the operational amplifier US1 When the switching tube S3 receives the output signal of the sub-control circuit and disconnects it, the set value of the output voltage V0 of the main circuit returns to the rated value, the first feedback signal is output to the driving circuit after the differential operation of the first voltage reference signal Vref1 at the positive phase input end of the operational amplifier US1 and the input signal at the negative phase input end, the driving circuit outputs the driving signal to the main circuit, and the output voltage V0 of the main circuit returns to the rated value.
Preferably, the voltage loop includes an operational amplifier US2, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C2 and a switching tube S4, one end of a resistor R7 is connected to the output end of the main circuit, the other end of the resistor R7 is connected to the negative phase input end of the operational amplifier US2, the first end of the capacitor C2 and one end of the resistor R8, the second end of the capacitor C2 is connected to one end of the resistor R6, the output end of the operational amplifier US2 is connected to the other end of the resistor R6 and the input end of the driving circuit, and the other end of the resistor R8 is connected to ground; a second voltage reference signal Vref2 is input to one end of the resistor R9, the other end of the resistor R9 is connected to the non-inverting input end of the operational amplifier US2 to serve as a common end, the common end is connected to one ends of the resistor R10 and the resistor R11, the other end of the resistor R11 is connected to the ground, the other end of the resistor R10 is connected to one end of the switch tube S4, the other end of the switch tube S4 is connected to the ground, and the control end of the switch tube S4 is connected to the sub-control circuit. The input signal of the negative phase input end of the operational amplifier US2 is obtained by dividing the output voltage V0 of the main circuit through a resistor R7 and a resistor R8, the input signal of the positive phase input end of the operational amplifier US2 is obtained by dividing the second voltage reference signal Vref2 through a resistor R9, a resistor R10 and a resistor R11, the operational amplifier US2 carries out differential operational amplification on the input signal of the negative phase end and the input signal of the positive phase end through a compensation network consisting of a resistor R6 and a capacitor C2 and outputs a second feedback signal to the driving circuit, and the driving circuit outputs the driving signal to the main circuit, so that the output voltage V0 of the main circuit is reduced and returns to a rated value.
Preferably, the sub-control circuit comprises a comparator US3, a comparator US4, an RS flip-flop a1, an RS flip-flop a2, an RS flip-flop A3, an AND gate circuit AND, a first delay circuit AND a second delay circuit, a positive phase input terminal of the comparator US3 is connected to an output terminal of the main circuit, a negative phase input terminal of the comparator US3 is inputted with a third voltage reference signal Vref3, an output terminal of the comparator US3 is connected to an S terminal of the RS flip-flop a1, a Q terminal of the RS flip-flop a1 is connected to an input terminal of the first delay circuit AND an R terminal of the RS flip-flop A3, respectively, an output terminal of the first delay circuit is connected to a first input terminal of the AND gate circuit AND, a positive phase input terminal of the comparator US4 is inputted with a voltage sample value of a resistor R1, a negative phase input terminal of the comparator US4 is inputted with a fourth voltage reference signal Vref4, an output terminal of the comparator US4 is connected to a second input terminal of the AND gate circuit, the output end of the AND circuit is connected with the S end of the RS trigger A2, the Q end of the RS trigger A3 is respectively connected with the R end of the RS trigger A1, the R end of the RS trigger A2 AND the control end of the switch tube S2, the S end of the RS trigger A3 is connected with the output end of the second delay circuit, AND the Q end of the RS trigger A2 is respectively connected with the input end of the second delay circuit AND the control end of the main control circuit. When the R ends of the RS trigger A1, the RS trigger A2 and the RS trigger A3 receive triggering, the output Q end is set low, when the S end receives triggering, the output Q end is set high, and the first delay circuit and the second delay circuit delay input signals; when the LED load is disconnected under the condition that the LED driver normally works, the voltage of a positive phase end of the comparator US3 is higher than that of a negative phase end, a high level is output to an R end of the trigger A1, a Q end of the trigger A1 outputs a high level to the first delay circuit and the trigger A3, when the R end of the trigger A3 receives the high level, the Q end outputs a low level VX2 to the switch tube S2, the switch tube S2 is disconnected, and the main circuit is disconnected with the LED load; the first end of the AND gate AND inputs a high level, no voltage exists between the resistor R1 AND the LED load due to the fact that the LED load is pulled out, the positive phase end of the comparator US4 is lower than the negative phase end, the comparator US4 outputs a low level, AND the AND gate AND does not work; when the LED load is reconnected under the condition that the LED driver normally works, since the LED load is reconnected to the plug-in resistor R1, the voltage rises to the fourth voltage reference signal Vref4, then the positive phase terminal of the comparator US4 is higher than the negative phase terminal, the comparator US4 outputs a high level, AND the AND gate AND works to output a high level to the S terminal of the flip-flop a2, the Q terminal of the flip-flop a2 outputs a high level to the switching tube S3 or the switching tube S4 of the voltage ring in the second delay circuit AND the main control circuit, the switching tube S3 or the switching tube S4 of the voltage ring in the sub control circuit is closed to reduce the output voltage Vo of the main circuit, the second delay circuit transmits the high level output by the flip-flop a2 to the S terminal of the flip-flop A3 through delay, the Q terminal of the flip-flop A3 outputs a high level to the R terminal of the flip-flop a1 AND the switching tube S2, the switching tube S2 is turned on, AND the flip-flop a1 outputs a low level at the same time, the Q end of the trigger A2 outputs low level, the switch tube S3 or the switch tube S4 of the voltage ring in the main control circuit is disconnected, and the output voltage V0 is recovered to the rated value; the problem of lamp flash caused by the fact that the driving power supply outputs no-load voltage larger than LED load voltage when the LED is plugged under the condition of electrification is solved.
The invention also provides a control method of the hot-pluggable LED driving power supply, which comprises the following steps: s01: sampling the output voltage of the main circuit; s02: sampling the voltage of the resistor R1; s03: judging whether the output voltage of the main circuit exceeds a third voltage reference signal Vref3, if so, going to step S04, and if not, going back to step S03; s04: turning off the switching tube S2; s05: judging whether the voltage of the resistor R1 exceeds a fourth voltage reference signal Vref4, if yes, going to step S06, if no, going back to step S03; s06: reducing the output voltage of the main circuit; s07: closing the switch tube S2; s08: raising the main circuit output voltage to a nominal value. Through the control method of the steps S01 to S08, the problem that the no-load voltage output by the driving power supply is larger than the load voltage of the LED is solved, and the condition that the LED flashes is prevented.
Preferably, in step S08, the main circuit output voltage rated value is calculated by the following equation:
where V1 is the rated output voltage of the main circuit. When the resistor R3 is short-circuited by the switch tube S3, the output voltage V0 of the main circuit is reduced, and when the resistor R3 is not short-circuited, the output voltage V0 of the main circuit returns to the rated value.
Preferably, in step S08, the main circuit output voltage rated value is calculated by the following equation:
wherein, Z1 is the parallel resistance value of the resistor R10 and the resistor R11, V3 is the voltage value input by the non-inverting input terminal of the operational amplifier US2, and V1 is the rated value of the output voltage of the main circuit. When the switch tube S4 is closed, the resistor R10 is connected in parallel with the resistor R11, and the output voltage V0 of the main circuit decreases, and when the switch tube S4 is opened, the resistor R10 is not connected in parallel with the resistor R11, and the output voltage V0 of the main circuit has a rated value.
The invention has the beneficial effects that: by adding the switch tube S2, the resistor R1 and the sub-control circuit to the output end of the driving power supply, the switch tube S2 is disconnected after the LED load is pulled out, so that the output of the driving power supply is disconnected with the LED load; when the LED load is reconnected, the output voltage of the driving power supply is reduced, the switch tube S2 is closed, and the output voltage of the driving power supply is raised back to the original output voltage after the switch tube S2 is closed, so that the LED lamp current is raised to the rated value from a small value when the LED load is reconnected, the LED lamp load is prevented from being pulled out under the charged condition and reconnected under the charged condition, and the problem that the lamp flashes instantly can occur because the driving power supply outputs no-load voltage which is greater than the LED lamp voltage.
Drawings
Fig. 1 is a circuit block diagram of an LED driving power supply according to a first embodiment.
Fig. 2 is a schematic circuit diagram of the voltage ring according to the first embodiment.
Fig. 3 is a schematic circuit diagram of the voltage ring according to the second embodiment.
Fig. 4 is a schematic circuit diagram of the sub-control circuit according to the first embodiment.
Fig. 5 is a flow chart of a method for controlling an LED driving power according to the present invention.
In the figure, 1 is a main circuit, 2 is a main control circuit, 3 is a sub-control circuit, 4 is a driving circuit, 5 is a voltage ring, 6 is a first delay circuit, 7 is a second delay circuit, and 8 is an LED load.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
The first embodiment is as follows: a hot-pluggable LED driving power supply is shown in figure 1 and comprises a main circuit 1, a switch tube S2, a main control circuit 2, a sub-control circuit 3 and a resistor R1, wherein the main circuit 1 comprises a switch tube S1, and the main circuit 1 processes energy conversion of a power level under the control of the main control circuit 2 and supplies the energy conversion to an LED load 8; the input end of the main control circuit 2 is connected with the output end of the main circuit 1 and is used for sampling the output voltage of the main circuit 1, the control end of the main control circuit 2 is connected with the sub-control circuit 3, and the output end of the main control circuit 2 is connected with the control end of the switch tube S1; the switching tube S2 is connected in series between the main circuit 1 and the LED load 8, and the control end of the switching tube S2 is connected with the sub-control circuit 3; the resistor R1 is connected in parallel with the switch tube S2; the sub-control circuit 3 comprises a first sampling end, a second sampling end, a first output end and a second output end, the first sampling end samples the output voltage of the main circuit 1, the second sampling end samples the voltage of a resistor R1, the first output end is connected with the main control circuit 2, the second output end is connected with a switch tube S2, and when the sub-control circuit detects that the output voltage of the main circuit exceeds a third preset value, the sub-control circuit controls the switch tube S2 to be switched off; when the voltage of the resistor R1 is detected to exceed a fourth preset value and the output voltage of the main circuit is detected to exceed a third preset value, the output voltage of the main circuit is controlled to be reduced by controlling the main control circuit, the switch tube S2 is controlled to be closed, the impedance of the resistor R1 is several times or ten times of the impedance of the LED load, the main control circuit 2 comprises a driving circuit 4, a photoelectric coupling circuit and a voltage ring 5, the input end of the voltage ring 5 is connected with the output end of the main circuit 1, the output end of the voltage ring 5 is connected with the input end of the driving circuit 4, and the output end of the driving circuit 4 is connected with the switch tube S1 through the photoelectric coupling circuit.
As shown in fig. 2, the voltage loop 5 includes an operational amplifier US1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, and a switch tube S3, wherein a first voltage reference signal Vref1 is input to a positive phase input terminal of the operational amplifier US1, one end of the resistor R3 is connected to an output positive terminal of the main circuit 1, the other end of the resistor R3 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to a negative phase input terminal of the operational amplifier US1, a first end of the capacitor C1, and one end of the resistor R5, a second end of the capacitor C1 is connected to one end of the resistor R2, an output terminal of the operational amplifier US1 is connected to the other end of the resistor R2 and an input terminal of the drive circuit 4, the other end of the R5 is grounded, the switch tube S3 is connected in parallel to the resistor R3, and a control terminal of the switch tube S3 is connected to the sub-control circuit 3 as a control terminal of the main control circuit 2.
As shown in fig. 4, the sub-control circuit 3 includes a comparator US3, a comparator US4, an RS flip-flop a1, an RS flip-flop a2, an RS flip-flop A3, an AND gate circuit AND, a first delay circuit 6 AND a second delay circuit 7, a positive phase input terminal of the comparator US3 is connected to an output terminal of the main circuit 1, a negative phase input terminal of the comparator US3 is inputted with a third voltage reference signal Vref3, an output terminal of the comparator US3 is connected to an S terminal of the RS flip-flop a1, a Q terminal of the RS flip-flop a1 is connected to an input terminal of the first delay circuit 6 AND an R terminal of the RS flip-flop A3, respectively, an output terminal of the first delay circuit 6 is connected to a first input terminal of the AND gate circuit AND, a positive phase input terminal of the comparator US4 is inputted with a voltage sample value of a resistor R1, a negative phase input terminal of the comparator US4 is inputted with a fourth voltage reference signal 4, an output terminal of the comparator US4 is connected to a second input terminal of the AND gate circuit AND the RS 2, the Q end of the RS flip-flop A3 is connected to the R end of the RS flip-flop a1, the R end of the RS flip-flop a2, and the control end of the switch tube S2, the S end of the RS flip-flop A3 is connected to the input end of the second delay circuit 7, and the Q end of the RS flip-flop a2 is connected to the output end of the second delay circuit 7 and the main control circuit 2. The third voltage reference signal Vref3 is used to set a third preset value and the fourth voltage reference signal Vref4 is used to set a fourth preset value.
In a specific application, when the LED load 8 is disconnected under the condition that the LED driver normally works, the voltage of the positive phase end of the comparator US3 is higher than the voltage of the negative phase end, and outputs a high level to the R end of the flip-flop a1, the Q end of the flip-flop a1 outputs a high level to the first delay circuit 6 and the flip-flop A3, and when the R end of the flip-flop A3 receives the high level, the Q end outputs a low level to the switching tube S2, the switching tube S2 is disconnected, and the main circuit 1 is disconnected from the LED load 8; the first end of the AND gate AND inputs a high level, no voltage exists between the resistor R1 AND the LED load 8 due to the fact that the LED load 8 is pulled out, the positive phase end of the comparator US4 is lower than the negative phase end, the comparator US4 outputs a low level, AND the AND gate AND does not work; when the LED load 8 is reconnected under the condition that the LED driver normally works, since the LED load 8 is reconnected to the plug-in resistor R1, the voltage rises to the fourth voltage reference signal Vref4, the positive phase end of the comparator US4 is higher than the negative phase end, the comparator US4 outputs a high level, the AND gate AND works to output a high level to the S end of the flip-flop a2, the Q end of the flip-flop a2 outputs a high level to the second delay circuit 7 AND the switching tube S3 of the voltage loop 5 in the main control circuit 2, the switching tube S3 is closed, the input signal of the negative phase end of the operational amplifier US1 is divided by the resistor R3, the resistor R4 AND the resistor R5 to the output voltage Vo of the main circuit 1, the operational amplifier US1 performs differential operation amplification on the input signal of the negative phase end AND the first voltage reference signal Vref1 of the positive phase end through the compensation network composed of the resistor R2 AND the capacitor C1 AND outputs the feedback signal to the driving circuit 4, the driving circuit 4 outputs a driving signal through a photocoupling circuit to control the on-off of a switch tube S1 of the main circuit 1, the output voltage of the main circuit 1 is controlled through the on-off of a switch tube S1, the rated value of the output voltage V0 of the main circuit 1 is set by a first voltage reference signal Vref1, a resistor R3, a resistor R4 and a resistor R5, when the switch tube S3 receives the output signal of the sub-control circuit 3 to close the sub-control circuit, the set value of the output voltage V0 of the main circuit 1 becomes small, a first feedback signal is output to the driving circuit 4 after the differential operation of the first voltage reference signal Vref1 at the positive phase input end and the input signal at the negative phase input end of the operational amplifier US1, the driving circuit 4 outputs the driving signal to the main circuit 1 to reduce the output voltage V0 of the main circuit 1, a second delay circuit 7 transmits the high level output by the trigger A2 to the S end of the trigger A3 through delay, the Q end of the trigger A3 outputs the high level to the R end of the trigger A1 and the switch tube S2, when the switch tube S2 is turned on and the flip-flop a1 outputs a low level to enable the and gate to output a low level, the Q terminal of the flip-flop a2 outputs a low level to turn off the switch tube S3 of the voltage loop 5 in the main control circuit 2, the resistor R3 is not short-circuited, the output voltage V0 of the main circuit 1 returns to a rated value, a first feedback signal is output to the driving circuit 4 after a differential operation between a first voltage reference signal Vref1 at a positive phase input end and an input signal at a negative phase input end of the operational amplifier US1, the driving circuit 4 outputs a driving signal to the main circuit 1, and the output voltage V0 of the main circuit 1 returns to the rated value. The switch tube S3 in this embodiment may also be connected in parallel across the resistor R4.
In a second embodiment, as shown in fig. 3, the voltage ring 5 includes an operational amplifier US2, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C2, and a switch tube S4, one end of the resistor R7 is connected to the output end of the main circuit 1, the other end of the resistor R7 is connected to the negative phase input end of the operational amplifier US2, the first end of the capacitor C2, and one end of the resistor R8, the second end of the capacitor C2 is connected to one end of the resistor R6, the output end of the operational amplifier US2 is connected to the other end of the resistor R6 and the input end of the driving circuit 4, and the other end of the resistor R8 is connected to ground; one end of the resistor R9 inputs the second voltage reference signal Vref2, the other end of the resistor R9 is connected to the non-inverting input terminal of the operational amplifier US2 as a common terminal, the common terminal is connected to one ends of the resistor R10 and the resistor R11, the other end of the resistor R11 is connected to ground, the other end of the resistor R10 is connected to one end of the switch tube S4, the other end of the switch tube S4 is connected to ground, and the control terminal of the switch tube S4 is connected to the sub-control circuit 3. The rest circuits are the same as the first embodiment. Compared with the first embodiment, the voltage signal regulation amplitude is larger by regulating the input signal at the non-inverting input terminal of the operational amplifier US2 through whether the resistor R10 and the resistor R11 are connected in parallel or not. The switch tube S4 in this embodiment can also be connected in series with the resistor R11.
As shown in fig. 5, a method for controlling a hot-pluggable LED driving power supply according to the present invention includes the following steps: s01: sampling the output voltage of the main circuit 1; s02: sampling the voltage of the resistor R1; s03: judging whether the output voltage of the main circuit 1 exceeds the third voltage reference signal Vref3, if so, going to step S04, if not, going back to step S03; s04: turning off the switching tube S2; s05: judging whether the voltage of the resistor R1 exceeds a fourth voltage reference signal Vref4, if yes, going to step S06, if no, going back to step S03; s06: the output voltage of the main circuit 1 is reduced; s07: closing the switch tube S2; s08: raising the main circuit 1 output voltage to a rated value.
In the first embodiment, the calculation formula of the rated output voltage of the main circuit 1 is as follows:
where V1 is the rated output voltage of the main circuit 1.
In the second embodiment, the calculation formula of the rated output voltage of the main circuit 1 is:
wherein Z1 is the parallel resistance of the resistor R10 and the resistor R11, V3 is the voltage value input to the non-inverting input terminal of the operational amplifier US2, and V1 is the rated value of the output voltage of the main circuit 1.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (8)
1. A hot-pluggable LED driving power supply is characterized by comprising
The LED driving circuit comprises a main circuit, a switch tube S2, a main control circuit, a sub control circuit and a resistor R1, wherein the main circuit comprises a switch tube S1, and the main circuit processes energy conversion of a power stage and supplies the energy conversion to an LED load under the control of the main control circuit;
the input end of the main control circuit is connected with the output end of the main circuit and is used for sampling the output voltage of the main circuit, the control end of the main control circuit is connected with the sub-control circuit, and the output end of the main control circuit is connected with the control end of the switch tube S1;
the switch tube S2 is connected in series between the main circuit and the LED load, and the control end of the switch tube S2 is connected with the sub-control circuit;
the resistor R1 is connected in parallel with the switch tube S2;
the sub-control circuit comprises a first sampling end, a second sampling end, a first output end and a second output end, the first sampling end samples the output voltage of the main circuit, the second sampling end samples the voltage of the resistor R1, the first output end is connected with the main control circuit, and the second output end is connected with the switch tube S2;
when the sub-control circuit detects that the output voltage of the main circuit exceeds a third preset value, the sub-control circuit controls a switch tube S2 to be switched off; when the voltage of the resistor R1 is detected to exceed a fourth preset value and the output voltage of the main circuit is detected to exceed a third preset value, the main control circuit is controlled to reduce the output voltage of the main circuit and control the switch tube S2 to be closed;
the sub-control circuit comprises a comparator US3, a comparator US4, an RS flip-flop A1, an RS flip-flop A2, an RS flip-flop A3, an AND gate circuit AND, a first delay circuit AND a second delay circuit, wherein the positive phase input end of the comparator US3 is connected with the output end of the main circuit, the negative phase input end of the comparator US3 is input with a third voltage reference signal Vref3, the output end of the comparator US3 is connected with the S end of the RS flip-flop A1, the Q end of the RS flip-flop A1 is respectively connected with the input end of the first delay circuit AND the R end of the RS flip-flop A3, the output end of the first delay circuit is connected with the first input end of the AND gate circuit AND, the positive phase input end of the comparator US4 is input with the sampled voltage of a resistor R1, the negative phase input end of the comparator US4 is input with a fourth voltage reference signal Vref4, the output end of the comparator US4 is connected with the second input end of the AND gate circuit AND, the output end of the AND circuit is connected with the S end of the RS trigger A2, the Q end of the RS trigger A3 is respectively connected with the R end of the RS trigger A1, the R end of the RS trigger A2 AND the control end of the switch tube S2, the S end of the RS trigger A3 is connected with the output end of the second delay circuit, AND the Q end of the RS trigger A2 is respectively connected with the input end of the second delay circuit AND the control end of the main control circuit.
2. The hot-pluggable LED driving power supply according to claim 1, wherein the resistance R1 has a resistance several times or ten times higher than the LED load resistance.
3. The hot-pluggable LED driving power supply according to claim 1, wherein the main control circuit comprises a driving circuit, a photoelectric coupling circuit and a voltage ring, an input end of the voltage ring is connected with an output end of the main circuit, an output end of the voltage ring is connected with an input end of the driving circuit, and an output end of the driving circuit is connected with the switching tube S1 through the photoelectric coupling circuit.
4. The hot-pluggable LED driving power supply according to claim 3, wherein the voltage loop comprises an operational amplifier US1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1 and a switch tube S3, wherein a first voltage reference signal Vref1 is inputted to a positive phase input terminal of the operational amplifier US1, one end of the resistor R3 is connected to a positive output terminal of the main circuit, the other end of the resistor R3 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to a negative phase input terminal of the operational amplifier US1, a first end of the capacitor C1 and one end of the resistor R5, a second end of the capacitor C1 is connected to one end of the resistor R2, output terminals of the operational amplifier US1 are respectively connected to the other end of the resistor R2 and the input terminal of the driving circuit, the other end of the R5 is grounded, and the switch tube S3 is connected in parallel to the resistor R3, and the control end of the switching tube S3 is used as the control end of the main control circuit and is connected with the sub control circuit.
5. The hot-pluggable LED driving power supply according to claim 3, wherein the voltage loop comprises an operational amplifier US2, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C2 and a switch tube S4, one end of a resistor R7 is connected with the output end of the main circuit, the other end of the resistor R7 is respectively connected with the negative phase input end of the operational amplifier US2, the first end of the capacitor C2 and one end of a resistor R8, the second end of the capacitor C2 is connected with one end of a resistor R6, the output end of the operational amplifier US2 is respectively connected with the other end of the resistor R6 and the input end of the driving circuit, and the other end of the resistor R8 is connected to ground; a second voltage reference signal Vref2 is input to one end of the resistor R9, the other end of the resistor R9 is connected to the non-inverting input end of the operational amplifier US2 to serve as a common end, the common end is connected to one ends of the resistor R10 and the resistor R11, the other end of the resistor R11 is connected to the ground, the other end of the resistor R10 is connected to one end of the switch tube S4, the other end of the switch tube S4 is connected to the ground, and the control end of the switch tube S4 is connected to the sub-control circuit.
6. A control method of a hot-pluggable LED driving power supply, which is suitable for the hot-pluggable LED driving power supply as claimed in any one of claims 1 to 5, and comprises the following steps:
s01: sampling the output voltage of the main circuit;
s02: sampling the voltage of the resistor R1;
s03: judging whether the output voltage of the main circuit exceeds a third voltage reference signal Vref3, if so, going to step S04, and if not, going back to step S03;
s04: turning off the switching tube S2;
s05: judging whether the voltage of the resistor R1 exceeds a fourth voltage reference signal Vref4, if yes, going to step S06, if no, going back to step S03;
s06: reducing the output voltage of the main circuit;
s07: closing the switch tube S2;
s08: raising the main circuit output voltage to a nominal value.
7. The method as claimed in claim 6, wherein in step S08, the main circuit output voltage rating is calculated by:
where V1 is the rated output voltage of the main circuit.
8. The method as claimed in claim 6, wherein in step S08, the main circuit output voltage rating is calculated by:
wherein, Z1 is the parallel resistance value of the resistor R10 and the resistor R11, V3 is the voltage value input by the non-inverting input terminal of the operational amplifier US2, and V1 is the rated value of the output voltage of the main circuit.
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| CN201911294645.XA CN111065184B (en) | 2019-12-16 | 2019-12-16 | Hot-pluggable LED driving power supply and control method thereof |
| PCT/CN2020/096928 WO2021120561A1 (en) | 2019-12-16 | 2020-06-19 | Hot-pluggable led driving power supply and control method therefor |
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| CN201911294645.XA CN111065184B (en) | 2019-12-16 | 2019-12-16 | Hot-pluggable LED driving power supply and control method thereof |
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| CN103037585A (en) * | 2012-12-21 | 2013-04-10 | 深圳桑达百利电器有限公司 | Distributed light-emitting diode (LED) lamp and drive power supply plug-in plug-out protective circuit thereof |
| CN106877278A (en) * | 2016-12-28 | 2017-06-20 | 武汉智能控制工业技术研究院有限公司 | A kind of circuit overloads protection system and guard method based on load detecting |
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| US6771478B2 (en) * | 2000-12-22 | 2004-08-03 | Ixys Corporation | Hot-swap protection circuit |
| CN102752912B (en) * | 2012-06-01 | 2015-11-25 | 台达电子企业管理（上海）有限公司 | A kind of LED drive circuit |
| CN104254167B (en) * | 2013-06-28 | 2017-03-22 | 欧普照明股份有限公司 | LED (light emitting diode) lighting circuit |
| CN103826363B (en) * | 2014-01-28 | 2016-05-25 | 杰华特微电子（杭州）有限公司 | For the hot plug holding circuit of LED luminaire |
| WO2016110833A2 (en) * | 2015-01-06 | 2016-07-14 | Cmoo Systems Itd. | A method and apparatus for power extraction in a pre-existing ac wiring infrastructure |
| CN105356735B (en) * | 2015-10-15 | 2018-01-16 | 无锡华润矽科微电子有限公司 | A kind of open loop protection circuit for reducing output voltage overshoot |
| CN105633911B (en) * | 2015-12-30 | 2018-06-26 | 生迪智慧科技有限公司 | The protection circuit and method of LED matrix |
| CN105680679B (en) * | 2016-01-25 | 2018-10-02 | 浙江凯耀照明股份有限公司 | Driver output overcurrent protects circuit and its guard method |
| CN206674257U (en) * | 2017-04-07 | 2017-11-24 | 深圳迈睿智能科技有限公司 | A kind of LED power and LED lamp for supporting hot plug |
| CN111065184B (en) * | 2019-12-16 | 2021-12-28 | 杭州优特电源有限公司 | Hot-pluggable LED driving power supply and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103037585A (en) * | 2012-12-21 | 2013-04-10 | 深圳桑达百利电器有限公司 | Distributed light-emitting diode (LED) lamp and drive power supply plug-in plug-out protective circuit thereof |
| CN106877278A (en) * | 2016-12-28 | 2017-06-20 | 武汉智能控制工业技术研究院有限公司 | A kind of circuit overloads protection system and guard method based on load detecting |
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