WO2012016410A1 - 一种多路led负载供电电路 - Google Patents
一种多路led负载供电电路 Download PDFInfo
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- WO2012016410A1 WO2012016410A1 PCT/CN2010/079857 CN2010079857W WO2012016410A1 WO 2012016410 A1 WO2012016410 A1 WO 2012016410A1 CN 2010079857 W CN2010079857 W CN 2010079857W WO 2012016410 A1 WO2012016410 A1 WO 2012016410A1
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- led load
- switch tube
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- control circuit
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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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
-
- 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
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/39—Circuits containing inverter bridges
-
- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
-
- 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
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/385—Switched mode power supply [SMPS] using flyback topology
Definitions
- the present invention relates to the field of power electronics, and in particular, to a multi-channel LED load power supply circuit. Background technique
- FIG. 1 the figure is a circuit suitable for two-way LED constant current driving (China Application No. 200910155848.0), wherein the capacitor Cb can control the currents of the two LED loads (A1 and A2) to be equal.
- Figure 1 shows only a constant current drive circuit with two LED loads. When the LED load is greater than two, it can be realized by the circuit shown in Figure 2 and Figure 3.
- Multi-channel LED load is realized by the current sharing transformer T1. Current sharing.
- Figure 2 applies to the drive of even-numbered LED loads
- Figure 3 applies to the drive of odd-numbered LED loads.
- FIG. 4 the figure shows an LED driving circuit with an open circuit protection circuit in the prior art.
- Each LED load is connected in parallel with an open circuit protection circuit K.
- the trigger thyristors SCR1, SCR2 are turned on, and the thyristor flows through the load current to prevent an abnormal output voltage due to the open load.
- the open circuit protection circuit K has the following disadvantages: when the output voltage is abnormal, the trigger thyristor is turned on, and the short circuit discharge of the output filter capacitor (Co3, Co4) generates a large inrush current, which increases the current stress of the circuit. Circuit costs increase while reducing circuit reliability.
- the technical problem to be solved by the present invention is to provide a multi-channel LED load power supply circuit capable of reducing the current stress of the circuit and the cost of the circuit.
- the present invention provides a multi-channel LED load power supply circuit, including: a first filter capacitor, a second filter capacitor, a first switch tube, a second switch tube, a first rectification branch, and a second rectification branch;
- the input ends of the first rectifying branch and the second rectifying branch are connected to a high frequency alternating current power source;
- the first input end of the first rectifying branch is connected in series with the first diode, the first LED load, the fourth diode and the first capacitor, and is connected to the second input end of the first rectifying branch;
- the second input end of the second rectifying branch is connected in series with the first capacitor, the third diode, the second LED load and the second diode, and is connected to the first input end of the second rectifying branch;
- the first input end and the second input end of the first rectifying branch are respectively connected to the first input end and the second input end of the second rectifying circuit
- a first filter capacitor is connected in parallel to both ends of the first LED load;
- the second filter capacitor is connected in parallel to both ends of the second LED load;
- the first switch tube is connected in parallel at two ends of the second diode, and when the first LED load needs to be turned off, the first switch tube is closed;
- the second switch tube is connected in parallel at both ends of the fourth diode, and when the second LED load needs to be turned off, the second switch tube is closed.
- the first control circuit is configured to detect a first LED load output voltage, and when the first LED load output voltage is greater than the first preset voltage, control the first switch tube to be closed;
- the second control circuit is configured to detect a second LED load output voltage, and when the second LED load output voltage is greater than a second preset voltage, control the second switch tube to be closed.
- the first control circuit is specifically a first comparator
- the second control circuit is specifically a second comparator
- the positive input end of the first comparator is connected to the positive output end of the first LED load, the negative input end of the first comparator is connected to the first preset voltage, and the output end of the first comparator is connected to the control end of the first switch tube ;
- the positive input end of the second comparator is connected to the positive output end of the second LED load, the negative input end of the second comparator is connected to the second preset voltage, and the output end of the second comparator is connected to the control end of the second switch tube .
- the invention also provides a multi-channel LED load power supply circuit, comprising: a first filter capacitor, a second filter capacitor, a first rectification branch and a second rectification branch;
- the input ends of the first rectifying branch and the second rectifying branch are connected to a high frequency alternating current power supply; the first input end of the first rectifying branch is connected in series with the first diode, the first LED load, a second switching tube and a first capacitor, and connected to the second input end of the first rectifying branch;
- the second input end of the second rectifying branch is connected in series with the first capacitor, the second diode, and the second
- the first input end and the second input end of the first rectifying branch are respectively connected to the first input end and the second input end of the second rectifying circuit
- the high frequency alternating current power source When the power supply circuit is in a normal state: the high frequency alternating current power source outputs a positive voltage, the first diode and the second switch tube are turned on to supply power to the first LED load; the alternating current power source outputs a negative voltage, the first switch tube and The second diode is turned on to supply power to the second LED load;
- the first switch tube When the output of the first LED load needs to be turned off, the first switch tube is controlled to be closed when the high frequency AC power source outputs positive and negative voltages; when the output of the second LED load needs to be turned off, the second switch tube is controlled to be at the high frequency AC power source It is closed when both positive and negative voltages are output.
- the method further includes a first switch transistor driving circuit, a second switch transistor driving circuit, a first control circuit, and a second control circuit;
- the first switch tube driving circuit includes: a first enable circuit, a third diode, and a first synchronous rectification control circuit; and an output end of the first control circuit is connected to the first switch tube through a third diode a control end; the output end of the first control circuit is connected to the first input end of the first synchronous rectification control circuit through a first enable circuit, and the second input end and the third input end of the first synchronous rectification control circuit are respectively connected
- the two ends of the first switching tube, the output end of the first synchronous rectification control circuit is connected to the control end of the first switching tube; when the output of the first LED load needs to be turned off, the first control circuit outputs a high level, so that the third two The pole tube is turned on, and the first enable circuit output enable signal is controlled to cause the first synchronous rectification control circuit to stop outputting the driving signal to close the first switch tube;
- the second switch tube driving circuit includes: a second enable circuit, a fourth diode, and a second synchronous rectification control circuit; and an output end of the second control circuit is connected to the second switch tube through the fourth diode a control end; the output end of the second control circuit is connected to the first input end of the second synchronous rectification control circuit through the second enable circuit, and the second input end and the third input end of the second synchronous rectification control circuit are respectively connected
- the two ends of the second switching tube, the output end of the second synchronous rectification control circuit is connected to the control end of the second switching tube; when the output of the second LED load needs to be turned off, the second control circuit outputs a high level, so that the fourth two The pole tube is turned on, and the second enable circuit output enable signal is controlled to cause the second synchronous rectification control circuit to stop outputting the driving signal to close the second switching tube.
- a first switch tube drive circuit a second switch tube drive circuit, a first control circuit and a second control circuit
- the first switch tube driving circuit includes: a third diode, a first current transformer, a first shaping reset circuit, a third triode, a fourth triode, and a first driving self-power supply circuit;
- the primary winding of a current transformer is connected between the first diode and the first switching tube, and the two ends of the secondary winding are connected to the input end of the first shaping reset circuit, and the two ends of the secondary winding are also connected to the first driving self
- the third triode and the fourth triode are connected into a push-pull circuit, the output end of the first shaping reset circuit is connected to the input end of the push-pull circuit, and the output end of the push-pull circuit is connected to the first switch tube
- the control end of the first driving self-power supply circuit is connected to the collector of the third triode; the collector of the fourth triode is grounded; the output end of the first control circuit is connected to the push-pull circuit through the third diode The input end; when the output of
- the second switch tube driving circuit includes: a fourth diode, a second current transformer, a second shaping reset circuit, a fifth triode, a sixth triode, and a second driving self-power supply circuit;
- the primary winding of the two current transformer is connected between the second diode and the second switching tube, and the two ends of the secondary winding are connected to the input end of the second shaping reset circuit, and the two ends of the secondary winding are also connected to the second driving
- the fifth triode and the sixth triode are connected into a push-pull circuit, the output end of the second shaping reset circuit is connected to the input end of the push-pull circuit, and the output end of the push-pull circuit is connected to the second switch tube a control end of the second driving self-power supply circuit is connected to the collector of the fifth triode; the collector of the sixth triode is grounded;
- the output end of the first control circuit is connected to the push-pull circuit through the third diode The input terminal; when the output of
- the method further includes a first switch transistor driving circuit, a second switch transistor driving circuit, a first control circuit, and a second control circuit;
- the first switch tube driving circuit includes: a third diode, a first auxiliary winding, and a third switching tube; an output end of the first control circuit is connected to a control end of the third switching tube through a third diode; One end of the switch tube is connected to the control end of the first switch tube, the other end is connected to one end of the first auxiliary winding, and the other end of the first auxiliary winding is grounded; when the output of the first LED load needs to be turned off, the first control circuit outputs low power Leveling, turning off the third diode and the third switching tube to close the first switching tube;
- the second switch tube driving circuit includes: a fourth diode, a second auxiliary winding, and a fourth switching tube; the output of the second control circuit is connected to the control end of the fourth switching tube through the fourth diode; the fourth switch One end of the tube is connected to the control end of the second switch tube, the other end is connected to one end of the second auxiliary winding, and the other end of the second auxiliary winding
- the first control circuit is configured to detect a first LED load output voltage, and when the first LED load output voltage is greater than the first preset voltage, control the first switch tube to be closed;
- the second control circuit is configured to detect a second LED load output voltage, and when the second LED load output voltage is greater than a second preset voltage, control the second switch tube to be closed.
- the first control circuit is specifically a first comparator
- the second control circuit is specifically a second comparator
- the positive input end of the first comparator is connected to the positive output end of the first LED load, the negative input end of the first comparator is connected to the first preset voltage, and the output end of the first comparator is connected to the anode of the third diode
- the positive input end of the second comparator is connected to the positive output end of the second LED load, the negative input end of the second comparator is connected to the second preset voltage, and the output end of the second comparator is connected to the fourth diode anode.
- the main circuit of the power supply circuit is a LLC resonant conversion circuit, a bridge circuit, an active clamp flyback circuit or a forward flyback circuit.
- the present invention has the following advantages:
- the multi-channel LED load power supply circuit has a first switch tube connected in parallel at both ends of the second diode and a second switch tube connected in parallel at both ends of the fourth diode; and the first switch tube and the second switch are controlled by The switching state of the tube controls the conduction mode of the second diode and the fourth diode.
- the first switch tube and the second switch tube are both disconnected; when the output of a certain load needs to be turned off, the corresponding switch tube is controlled to be closed, so that the diode connected in parallel with the switch tube is short-circuited. This avoids direct short-circuiting of a certain load to generate a large inrush current to the filter capacitor, thereby reducing the current stress of the circuit, improving the reliability of the circuit, and reducing the cost.
- 1 is a circuit diagram of a prior art suitable for constant current driving of two LEDs
- FIG. 2 is a driving circuit diagram of a prior art LED load suitable for even-numbered circuits
- FIG. 3 is a schematic diagram of a driving circuit suitable for an odd-numbered LED load in the prior art
- 4 is an LED driving circuit with an open circuit protection circuit in the prior art
- FIG. 5 is a circuit diagram of a first embodiment of a multi-channel LED load power supply circuit provided by the present invention
- FIG. 6 is a circuit diagram of a second embodiment of a multi-channel LED load power supply circuit provided by the present invention.
- FIG. 7 is a circuit diagram of a third embodiment of a multi-channel LED load power supply circuit provided by the present invention.
- FIG. 8 is a circuit diagram of a fourth embodiment of a multi-channel LED load power supply circuit provided by the present invention.
- Embodiment 9 is a circuit diagram of Embodiment 5 of a multi-channel LED load power supply circuit provided by the present invention.
- Embodiment 6 is a circuit diagram of Embodiment 6 of a multi-channel LED load power supply circuit provided by the present invention.
- Embodiment 7 is a circuit diagram of Embodiment 7 of a multi-channel LED load power supply circuit provided by the present invention.
- FIG. 12 is a circuit diagram of Embodiment 8 of the multi-channel LED load power supply circuit provided by the present invention.
- the figure is a circuit diagram of a first embodiment of a multi-channel LED load power supply circuit provided by the present invention.
- the multi-channel LED load power supply circuit provided in this embodiment includes: a first filter capacitor Col, a second filter capacitor Co2, a first switch transistor Q1, a second switch transistor Q2, a first rectifier branch, and a second rectifier branch;
- the input ends of the first rectifying branch and the second rectifying branch are connected to a high frequency alternating current power supply; as shown in FIG. 5, the anode of the first diode D1 and the cathode of the second diode D2 are connected to a high frequency At one end of the AC power source, the left end of the first capacitor Cb is connected to the other end of the high frequency AC power source. It should be noted that the connection between the first rectifying branch and the second rectifying branch in the following embodiments is the same as that in the embodiment, and details are not described herein again.
- the first input end of the first rectifying branch is connected in series with the first diode D1, the first LED load A1, the fourth diode D4 and the first capacitor Cb connected to the second input end of the first rectifying branch;
- the second input end of the second rectifying branch is connected in series with the first capacitor Cb, the third diode D3, the second LED load A2, and the second diode D2 connected to the first input end of the second rectifying branch;
- the first input end and the second input end of the first rectifying branch are respectively connected to the first input end and the second input end of the second rectifying circuit
- the first filter capacitor Col is connected in parallel to both ends of the first LED load A1; the second filter capacitor Co2 is connected in parallel to both ends of the second LED load A2;
- the first switch tube Q1 is connected in parallel at both ends of the second diode D2, and when the first LED load A1 needs to be turned off, the first switch tube Q1 is controlled to be closed;
- the second switch tube Q2 is connected in parallel at both ends of the fourth diode D4, and when the second LED load A2 needs to be turned off, the second switch tube Q2 is controlled to be closed.
- the high frequency AC power source provides energy for the first LED load A1 and the second LED load A2.
- the high frequency referred to in the high frequency alternating current power source is several tens of K or more.
- the closing and opening of the first switching transistor Q1 and the second switching transistor Q2 can be controlled by the first control signal Vs1 and the second control signal Vs2, respectively.
- the multi-channel LED load power supply circuit provided by the embodiment of the present invention has a first switch tube Q1 connected in parallel with the second diode D2 and a second switch tube Q2 connected in parallel with the fourth diode D4;
- the switching states of Q1 and the second switching transistor Q2 control the conduction modes of the second diode D2 and the fourth diode D4.
- the first rectification branch and the second rectification branch work alternately, Q1 and Q2 are both disconnected; when it is necessary to turn off the output of a certain load
- the corresponding switch tube is controlled to be closed, so that the diode connected in parallel with the switch tube is short-circuited. This avoids direct short-circuiting of a certain load to generate a large inrush current to the filter capacitor, thereby reducing the current stress of the circuit, improving the reliability of the circuit, and reducing the cost.
- FIG. 6 the figure is a circuit diagram of a second embodiment of a multi-channel LED load power supply circuit provided by the present invention.
- the multi-channel LED load power supply circuit provided by this embodiment further includes a first control circuit 601 and a second control circuit 602;
- the input end of the first control circuit 601 is connected to the output end of the first LED load A1, and the output end of the first control circuit 601 is connected to the control end of the first switch tube Q1.
- the first control circuit 601 is configured to detect a first LED load A1 output voltage, and when the first LED load A1 output voltage is greater than the first preset voltage, control the first switch tube Q1 to be closed;
- the input end of the second control circuit 602 is connected to the positive output end of the second LED load A2, and the output end of the second control circuit 602 is connected to the control end of the second switch tube Q2.
- the second control circuit 602 is configured to detect an output voltage of the second LED load A2. When the output voltage of the second LED load A2 is greater than the second preset voltage, the second switch Q2 is controlled to be closed.
- the multi-channel LED load power supply circuit controls the switching states of Q1 and Q2 by detecting the output voltage of the LED load, and is used for an LED fault in a certain way, such as an open circuit fault or over The fault is faulted, and the faulty LED load is turned off, thereby preventing abnormal overvoltage of the faulty LED load.
- a self-locking circuit can be added to keep the corresponding switch tube closed after the fault load is turned off.
- the first control circuit 601 provided by the embodiment of the present invention is specifically a first comparator IC1
- the second control circuit 602 is specifically a second comparator IC2
- the positive input end of the first comparator IC1 is connected to the positive output end of the first LED load A1, the negative input end of the first comparator IC1 is connected to the first preset voltage Vrefl, and the output end of the first comparator IC1 is connected to the first The control end of the switch tube Q1;
- the positive input terminal of the second comparator IC2 is connected to the positive output terminal of the second LED load A2, the negative input terminal of the second comparator IC2 is connected to the second preset voltage Vref2, and the output terminal of the second comparator IC2 is connected to the second terminal.
- first preset voltage Vref1 and the second preset voltage Vref2 may be the same or different.
- the rectifier circuit in the multi-channel LED load power supply circuit provided by the above embodiment includes four diodes, and the present invention further provides a multi-channel LED load power supply circuit, wherein the rectifier circuit includes two diodes and two switch tubes, and two switches The tube acts both as a synchronous rectifier in the normal state and as a switching tube in the fault state.
- Another multi-channel LED load supply circuit provided by the present invention will be described in detail below with reference to the accompanying drawings.
- FIG. 8 the figure is a circuit diagram of a fourth embodiment of a multi-channel LED load power supply circuit provided by the present invention.
- the multi-channel LED load power supply circuit provided in this embodiment includes: a first filter capacitor Col, a second filter capacitor Co2, a first rectification branch, and a second rectification branch;
- the input ends of the first rectifying branch and the second rectifying branch are connected to a high frequency alternating current power supply; the first input end of the first rectifying branch is connected in series with the first diode, the first LED load, and the second a switching tube and a first capacitor, and connected to the second input end of the first rectifying branch;
- the second input end of the second rectifying branch is connected in series with the first capacitor, the second diode, and the second
- the first input end and the second input end of the first rectifying branch are respectively connected to the first input end and the second input end of the second rectifying circuit
- the high frequency alternating current power source outputs a positive voltage
- the first diode Dl and the second switch tube Q2 are turned on to supply power to the first LED load A1
- the high frequency AC power source outputs a negative voltage
- the first switch tube Q1 and the second diode D2 are turned on to supply power to the second LED load A2
- the first switch tube Q1 is controlled to be in a closed state when the positive and negative voltages of the high frequency AC power source are turned on
- the second switch tube Q2 is controlled. It is closed when the positive and negative voltages of the high frequency AC power supply.
- the multi-channel LED load power supply circuit provided in this embodiment, when the system is in a normal state, the first diode D1, the second diode D2, and the first switch tube Q1 and the second switch tube Q2 used as diodes,
- the rectifier circuit is formed; when it is necessary to turn off a certain LED load, the switch tube in the rectifier branch corresponding to the LED load is always in a closed state, and the switch tube is used not only as a diode but also as a controllable switch tube.
- the circuit provided in this embodiment also avoids a large short-circuit caused by direct short-circuiting of the LED load, improves the reliability of the circuit, and reduces the cost.
- a self-locking circuit can be added to keep the corresponding switch tube closed after the fault load is turned off.
- FIG. 9 the figure is a circuit diagram of Embodiment 5 of a multi-channel LED load power supply circuit provided by the present invention. 901, a second switch driving circuit 902, a first control circuit 903 and a second control circuit 904;
- the first switch transistor driving circuit 901 includes: a first enable circuit 901a, a third diode D3, and a first synchronous rectification control circuit 901b;
- the output end of the first control circuit 903 is connected to the control end of the first switch tube Q1 through the third diode D3; the output end of the first control circuit 903 is connected to the first synchronous rectification control through the first enable circuit 901a.
- the first input end of the circuit 901b, the second input end and the third input end of the first synchronous rectification control circuit 901b are respectively connected to the two ends of the first switch tube Q1, and the output end of the first synchronous rectification control circuit 901b is connected to the first end.
- the control terminal of the switch Q1 when the output of the first LED load A1 needs to be turned off, the first control circuit 903 outputs a high level to turn on the third diode D3, and simultaneously controls the output of the first enable circuit 901a to enable The signal causes the first synchronous rectification control circuit 901b to stop outputting the driving signal to close the first switching transistor Q1;
- the second switch transistor driving circuit 902 includes: a second enable circuit 909a, a fourth diode D4, and a second synchronous rectification control circuit 902b;
- the output end of the second control circuit 904 is connected to the control end of the second switch tube Q2 through the fourth diode D4; the output end of the second control circuit 904 is connected to the second through the second enable circuit 902a.
- the first input end of the synchronous rectification control circuit 902b, the second input end and the third input end of the second synchronous rectification control circuit 902b are respectively connected at two ends of the second switching tube Q2, and the output end of the second synchronous rectification control circuit 902b Connecting the control end of the second switch Q2; when it is required to turn off the output of the second LED load A2, the second control circuit 904 outputs a high level to turn on the fourth diode D4 while controlling the second enable circuit 902a
- the output enable signal causes the second synchronous rectification control circuit 902b to stop outputting the drive signal to close the second switching transistor Q2.
- FIG. 10 is a circuit diagram of a sixth embodiment of a multi-channel LED load power supply circuit according to the present invention.
- the first switch transistor driving circuit 1001 includes: a third diode D3, a first current transformer ST1, and a first shaping Reset circuit 1001a, third transistor Q3, fourth transistor Q4 and first driving self-power supply circuit 1001b;
- the primary winding of the first current transformer ST1 is connected between the first diode D1 and the first switching transistor Q1, and the two ends of the secondary winding are connected to the input end of the first shaping reset circuit 1001a, and the two ends of the secondary winding
- the terminal is further connected to the input end of the first driving self-power supply circuit 1001b;
- the third transistor Q3 and the fourth transistor Q4 are connected into a push-pull circuit, and the first shaping reset circuit
- the output end of the 1001a is connected to the input end of the push-pull circuit, and the output end of the push-pull circuit is connected to the control end of the first switch tube Q1;
- the output end of the first driving self-power supply circuit 1001b is connected to the collector of the third transistor Q3; the collector of the fourth transistor Q4 is grounded;
- the output end of the first control circuit 903 is connected to the input end of the push-pull circuit through the third diode D3; when the output of the first LED load A1 needs to be turned off, the first control circuit 903 outputs a high level to make the third diode The tube D3 is turned on, and the push-pull circuit outputs a high level to close the first switch tube Q1;
- the second switch transistor driving circuit 1002 includes: a fourth diode D4, a second current transformer ST2, a second shaping reset circuit 1002a, a fifth transistor Q5, a sixth transistor Q6, and a second driver Self-powered circuit 1002b;
- the primary winding of the second current transformer ST2 is connected between the second diode D2 and the second switching transistor Q2, and the two ends of the secondary winding are connected to the input end of the second shaping reset circuit 1002a, and the two ends of the secondary winding
- the terminal is further connected to the input end of the second driving self-power supply circuit 1002b;
- the fifth triode Q5 and the sixth triode Q6 are connected into a push-pull circuit, and the second shaping reset circuit
- the output end of the 1002a is connected to the input end of the push-pull circuit, the output end of the push-pull circuit is connected to the control end of the second switch tube Q2; the output end of the second drive self-power supply circuit 1002b is connected to the collector of the fifth transistor Q5; The collector of the six transistor Q6 is grounded; the output of the first control circuit 903 is connected to the input terminal of the push-pull circuit through the third diode D3; when the output of the second LED load A2 needs to be turned off, the second control circuit 904 The output high level causes the fourth diode D4 to be turned on, and the push-pull circuit outputs a high level to close the second switching transistor Q3.
- the embodiment of the present invention further provides a switch tube driving circuit.
- FIG. 11 the figure is a circuit diagram of a seventh embodiment of a multi-channel LED load power supply circuit provided by the present invention.
- the first switch transistor driving circuit 1101 includes: a third diode D3, a first auxiliary winding T1-2, and a third Switch tube Q3;
- the output end of the first control circuit 903 is connected to the control end of the third switch tube Q3 through the third diode D3; one end of the third switch tube Q3 is connected to the control end of the first switch tube Q1, and the other end is connected to the first auxiliary winding T1. One end of -2, the other end of the first auxiliary winding T1-2 is grounded;
- the first control circuit 903 When it is necessary to turn off the output of the first LED load A1, the first control circuit 903 outputs a low level to turn off the third diode D3 and the third switching transistor Q3 to close the first switching transistor Q1;
- the second switch tube driving circuit 1102 includes: a fourth diode D4, a second auxiliary winding T1-3, and a fourth switching tube Q4;
- the output of the second control circuit 904 is connected to the control end of the fourth switch tube Q4 through the fourth diode D4; one end of the fourth switch tube Q4 is connected to the control end of the second switch tube Q2, and the other end is connected to the second auxiliary winding T1- One end of 3, the other end of the second auxiliary winding T1-3 is grounded; when it is necessary to turn off the output of the second LED load A2, the second control circuit 904 outputs a low level, so that the fourth diode D4 and the fourth switching tube Q4 is turned off, and the second switching transistor Q2 is closed.
- the first auxiliary winding and the second auxiliary winding may be a winding with a tap, and the tap is grounded and divided into a first auxiliary winding and a second auxiliary winding, as shown in FIG.
- first control circuit and the second control circuit in the multi-channel LED load power supply circuit shown in FIG. 9-11 are the same as those shown in FIG. 7, and are not described below, only in FIG. Based on the introduction of the control circuit, as shown in Figure 12.
- the first control circuit 1201 is configured to detect a first LED load A1 output voltage, and when the first LED load A1 output voltage is greater than the first preset voltage Vref1, control the first switch tube Q1 to be closed; the first control circuit 1201 The input terminal is connected to the positive output terminal of the first LED load A1, and the output terminal of the first control circuit 1201 is connected to the anode of the third diode D3.
- the second control circuit 1202 is configured to detect the output voltage of the second LED load A2. When the output voltage of the second LED load A2 is greater than the second preset voltage Vref2, the second switch Q2 is controlled to be closed.
- the input of the second control circuit 1202 is coupled to the positive output of the second LED load A2, and the output of the second control circuit 1202 is coupled to the anode of the fourth diode D4.
- the first control circuit 1201 is specifically a first comparator IC1
- the second control circuit 1202 is specifically a second comparator IC2;
- the positive input terminal of the first comparator IC1 is connected to the positive output terminal of the first LED load A1, the negative input terminal of the first comparator IC1 is connected to the first preset voltage Vrefl, and the output terminal of the first comparator IC2 is connected to the third diode The anode of the tube D3;
- the positive input terminal of the second comparator IC2 is connected to the positive output terminal of the second LED load A2, the negative input terminal of the second comparator IC2 is connected to the second preset voltage Vref2, and the output terminal of the second comparator IC2 is connected to the fourth diode The anode of tube D4.
- first preset voltage Vref1 and the second preset voltage Vref2 may be the same or different.
- the main circuit of the power supply circuit may be an LLC resonant conversion circuit, a bridge circuit, an active clamp flyback circuit, or a forward flyback circuit, wherein FIG. 9-12 is an LLC resonance.
- the circuit is the main circuit.
- the switch tube provided in the embodiment of the present invention may preferably be a MOSFET tube, as shown in FIGS. 8-12. It should be noted that the above embodiments are all described by taking two LED loads as an example. The technical solutions of the multiple LED load power supply circuits provided by all the embodiments of the present invention can be applied to more than two. In the circuit of the LED load path, the specific topology structure can be similar to the even-numbered LED load and the odd-numbered LED load as shown in FIG. 2 and FIG. 3, and details are not described herein again.
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- Circuit Arrangement For Electric Light Sources In General (AREA)
- Dc-Dc Converters (AREA)
Description
Claims
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US13/813,723 US9148933B2 (en) | 2010-08-03 | 2010-12-16 | Power supply circuit for multi-path light-emitting diode (LED) loads |
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CN201010246507.7 | 2010-08-03 | ||
CN2010102465077A CN102348310B (zh) | 2010-08-03 | 2010-08-03 | 一种多路led负载供电电路 |
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CN105101575A (zh) * | 2015-09-06 | 2015-11-25 | 王天甜 | 智能t系列led灯驱动器及其控制方法 |
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CN106455258A (zh) * | 2016-09-30 | 2017-02-22 | 成都赛昂电子科技有限公司 | 一种基于时基集成芯片的过流保护型路灯自动控制电路 |
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GB2587292B (en) * | 2018-05-28 | 2022-05-04 | Tridonic Gmbh & Co Kg | Power supply circuit, controlling method and lighting equipment |
CN109195261B (zh) * | 2018-10-08 | 2020-02-14 | 广东省崧盛电源技术有限公司 | 一种多路输出恒流驱动电路及驱动电源 |
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CN111817262B (zh) * | 2020-06-22 | 2023-03-14 | 深圳市禾望电气股份有限公司 | SiC器件的短路保护电路以及电力电子设备 |
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US9148933B2 (en) | 2015-09-29 |
US20130127343A1 (en) | 2013-05-23 |
CN102348310A (zh) | 2012-02-08 |
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