CN115226274A - Constant-voltage LED driving power supply load detection circuit with DALI function and detection method - Google Patents
Constant-voltage LED driving power supply load detection circuit with DALI function and detection method Download PDFInfo
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- CN115226274A CN115226274A CN202210509088.4A CN202210509088A CN115226274A CN 115226274 A CN115226274 A CN 115226274A CN 202210509088 A CN202210509088 A CN 202210509088A CN 115226274 A CN115226274 A CN 115226274A
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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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
- H05B45/34—Voltage stabilisation; Maintaining constant voltage
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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
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Abstract
The invention discloses a constant voltage LED driving power supply load detection circuit with a DALI function and a detection method, wherein the constant voltage LED driving power supply load detection circuit comprises a constant voltage output module, the constant voltage output module is provided with an anode output end and a cathode output end, the anode output end of the constant voltage output module is electrically connected to an anode connecting end of a load, the cathode output end of the constant voltage output module is electrically connected to a cathode connecting end of the load to form an output loop, the output loop is further provided with a first load detection circuit, a second load detection circuit, a loop current detection circuit, an LED brightness adjusting switch, an MCU control circuit and a driving and abnormal protection circuit, the detection method mainly judges the load condition according to feedback signals of the first load detection circuit and the second load detection circuit, the accuracy is high, and the misjudgment of the detection circuit of a high-power supply can be effectively prevented.
Description
Technical Field
The invention relates to the technical field of DALI power supplies, in particular to a load detection circuit and a detection method.
Background
According to the protocol requirements of the DALI system, when the constant voltage power supply has a DALI function, the DALI system must detect the load condition of the power supply, such as the presence or absence of the load of the output circuit. When the constant voltage power supply has the DALI function and needs to detect the load condition, the load condition is generally detected by detecting the magnitude of load current flowing through an output loop, the output current of a low-power DALI power supply is generally not large, and the method is better realized, but the output current of a high-power DALI power supply is relatively large, and due to the influence of the detection circuit on the overall power consumption, the detection circuit can detect misjudgment when the load of the output loop is small or no-load, for example, when the load current of the output loop is 10A, the detection circuit can detect the load condition, but when the load current of the output loop is 0.01A, the detection circuit is generally difficult to detect.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a load detection circuit of a constant voltage LED driving power supply with a DALI function, which has high accuracy.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a constant voltage LED driving power supply load detection circuit with a DALI function and a detection method thereof comprise a constant voltage output module, wherein the constant voltage output module is provided with an anode output end and a cathode output end, the anode output end of the constant voltage output module is electrically connected to the anode connecting end of a load, the cathode output end of the constant voltage output module is electrically connected to the cathode connecting end of the load to form an output loop, the output loop is further provided with a first load detection circuit, a second load detection circuit, a loop current detection circuit and an LED brightness adjusting switch, wherein the loop current detection circuit and the LED brightness adjusting switch are connected in series with the load, one input end of the second load detection circuit is electrically connected to the cathode connecting end of the load, the signal output end of the loop current detection circuit is electrically connected to the signal input end of the first load detection circuit, the signal output end of the first load detection circuit is electrically connected to one signal input end of an MCU control circuit, and the signal output end of the second load detection circuit is electrically connected to the other signal input end of the MCU control circuit; the positive electrode output end is also electrically connected to the input end of the power supply system, the output end of the power supply system is divided into two paths, one path is electrically connected to the power supply end of the first load detection circuit, and the other path is electrically connected to the power supply end of the MCU control circuit; the control signal end of the MCU control circuit is electrically connected to the control end of the LED brightness adjusting switch through the driving and abnormity protection circuit, and the input end of the driving and abnormity protection circuit is also connected to the negative electrode output end.
Another object of the present invention is to provide a method for detecting a load of a constant voltage LED driving power supply with a DALI function with high accuracy.
The method comprises the following specific steps that an MCU control circuit judges the load condition according to feedback signals of a first load detection circuit and a second load detection circuit, the first load detection circuit detects the load condition of an output loop and feeds effective signals back to the MCU control circuit, the MCU control circuit judges that the output loop has load and evaluates the ratio of the actual load to a rated load according to the effective signals, if the first load detection circuit detects the load condition of the output loop and feeds ineffective signals back to the MCU control circuit, the MCU control circuit starts the second load detection circuit to detect the load condition of the output loop, the second load detection circuit feeds signals back to the MCU control circuit, the MCU control circuit judges that the output loop has load and evaluates the ratio of the actual load to the rated load, and when the first load detection circuit and the second load detection circuit do not have feedback signals to the MCU control circuit, the MCU control circuit judges that the output loop is in a no-load state.
The invention has the beneficial effects that: compared with the prior art, the product is provided with a first load detection circuit and a small load circuit in an output loop, when a load exists and the ratio of the actual load to the rated load reaches A% to 100% (A is more than or equal to 0 and less than or equal to 100), the first load detection circuit can detect the condition of the load and feed back an effective signal to the MCU control circuit, when the load exists and the ratio of the actual load to the rated load is lower than A%, the first load detection circuit cannot detect the condition of the load and feed back an invalid signal to the MCU control circuit, at the moment, the second load detection circuit detects the condition of the load and feeds back a signal to the MCU control circuit, and when the load is no-load, the first load detection circuit and the second load detection circuit cannot detect the signal; the MCU control circuit is used for judging whether a load exists or not according to the existence of the signal and judging the ratio of the actual load to the rated load according to the signal of the first load detection circuit or the second load detection circuit, can identify the two conditions of no load and the condition that the ratio of the actual load to the rated load is lower than A% when the ratio of the actual load to the rated load reaches A% to 100%, has high accuracy and can effectively prevent the detection circuit of the high-power supply from misjudging.
Drawings
The invention is further illustrated by the following examples in conjunction with the drawings.
FIG. 1 is a system block diagram of the present invention;
FIG. 2 is a circuit schematic of the power supply system, LED dimmer switch and driver and fault protection circuit;
FIG. 3 is a circuit schematic of a first load detection circuit;
FIG. 4 is a circuit schematic of a DALI interface circuit;
FIG. 5 is a first circuit schematic of the second load detection circuit and the MCU control circuit;
FIG. 6 is a second circuit schematic of a second load detection circuit and an MCU control circuit;
FIG. 7 is a third circuit schematic of the second load detection circuit and the MCU control circuit;
fig. 8 is a flow chart of a detection method.
Detailed Description
Referring to fig. 1 to 8, a constant voltage LED driving power supply load detection circuit and detection method with DALI function includes a constant voltage output module having a positive output terminal and a negative output terminal, wherein the positive output terminal of the constant voltage output module is electrically connected to the positive connection terminal of a load, the negative output terminal of the constant voltage output module is electrically connected to the negative connection terminal of the load to form an output loop, the output loop is further provided with a first load detection circuit, a second load detection circuit, a loop current detection circuit and an LED brightness adjustment switch, the loop current detection circuit and the LED brightness adjustment switch are connected in series with the load, one of the input terminals of the second load detection circuit is electrically connected to the negative connection terminal of the load, the signal output terminal of the loop current detection circuit is electrically connected to the signal input terminal of the first load detection circuit, the signal output terminal of the first load detection circuit is electrically connected to one of the signal input terminals of an MCU control circuit, and the signal output terminal of the second load detection circuit is electrically connected to the other of the MCU control circuit; the positive output end is also electrically connected to the input end of the power supply system, the output end of the power supply system is divided into two paths, one path is electrically connected to the power supply end of the first load detection circuit, and the other path is electrically connected to the power supply end of the MCU control circuit; the control signal end of the MCU control circuit is electrically connected to the control end of the LED brightness adjusting switch through the driving and abnormity protection circuit, the input end of the driving and abnormity protection circuit is also connected to the negative electrode output end, the communication end of the MCU control circuit is in communication connection with the DALI system through the DALI interface circuit, and the DALI interface circuit is suitable for receiving a DALI signal of the DALI system and sending the DALI signal to the MCU control circuit.
Compared with the prior art, the product is provided with the first load detection circuit and the small load circuit in the output loop, when a load exists and the ratio of the actual load to the rated load reaches A% to 100% (A is more than or equal to 0 and less than or equal to 100), the first load detection circuit can detect the condition of the load and feed back an effective signal to the MCU control circuit, when a load exists and the ratio of the actual load to the rated load is lower than A%, the first load detection circuit cannot detect the condition of the load and feeds back an invalid signal to the MCU control circuit, the second load detection circuit detects the condition of the load and feeds back the signal to the MCU control circuit, when no load exists, the first load detection circuit and the second load detection circuit cannot detect signals; the MCU control circuit is used for judging whether a load exists or not according to the existence of the signal, judging the ratio of the actual load to the rated load according to the signal of the first load detection circuit or the second load detection circuit, not only identifying that the ratio of the actual load to the rated load reaches A% to 100%, but also identifying the conditions of no load and the ratio of the actual load to the rated load is lower than A%, has high accuracy, can effectively prevent the detection circuit of the high-power supply from misjudgment, and the MCU control circuit is communicated with the DALI system, when the load is an LED lamp, the MCU control circuit controls the LED brightness adjusting switch to adjust the brightness and the on-off state of the LED lamp, when the MCU control circuit outputs a PWM signal, the driving capability of the driving and abnormal protection circuit can be enhanced, the driving and abnormal protection circuit isolates the MCU control circuit from the LED brightness adjusting switch, the safety of the MCU control circuit is protected, the driving and abnormal protection circuit generates protection when detecting that abnormal conditions such as short circuit of an LED lamp and the like exist in an output loop, and the constant voltage output module outputs stable voltage.
The load is an LED lamp; the loop current detection circuit comprises a resistor R1, and the LED brightness adjusting switch comprises an MOS tube Q1, a resistor R2 and a resistor R3; the MCU control circuit comprises a control chip U3, a capacitor C20, a capacitor C28 and a capacitor R21, wherein the model of the control chip U3 is STM32G030; the driving and abnormal protection circuit comprises a resistor R11, a capacitor C13, a capacitor C10, an operational amplifier U2A, a capacitor C11, a resistor R19, a resistor R13, a resistor R12, a PNP type triode Q2, an NPN type triode Q3, a capacitor C6 and a resistor R4, wherein the model of the operational amplifier U2A is LM358; the first load detection circuit comprises a resistor R10, a resistor R14, a capacitor C12, a voltage stabilizer U5, a resistor R15, a resistor R16, a resistor R17, a capacitor C30, a capacitor C14, a diode D2, a resistor R18 and an operational amplifier U2B, wherein the model of the operational amplifier U2B is LM358; the power supply system comprises an NPN type triode Q5, a resistor R9, a voltage stabilizing diode ZD1, a capacitor C2, a capacitor C3, a voltage stabilizing chip U1 and a capacitor C5, wherein the model of the voltage stabilizing chip U1 is MD5333; the DALI interface circuit comprises a resistor R28, a rectifier bridge BD1, an MOS tube Q8, a resistor R26, a capacitor C31, a resistor R27, a PNP type triode Q6, a resistor R25, a resistor R23, a resistor R24, a PNP type triode Q7, a resistor R22, a zener diode ZD3, a capacitor C32, a photoelectric couple U4, a photoelectric couple U6, a resistor R21 and a resistor R20; the positive electrode connection end of the LED lamp is connected with the positive electrode output end of the constant voltage output module, the collector of the NPN type triode Q5 is divided into two paths, one path is connected with the positive electrode output end of the constant voltage output module, the other end is connected with one end of a resistor R9, the emitter of the NPN type triode Q5 is divided into three paths, the first path is grounded through a capacitor C3, the second path is connected with a pin 1 of a voltage stabilizing chip U1, the third path is used as a voltage output end VCC1, the base of the NPN type triode Q5 is divided into three paths, the first path is connected with the other end of the resistor R9, the second path is connected with the cathode of the voltage stabilizing diode ZD1, the third path is grounded through a capacitor C2, the positive electrode of the voltage stabilizing diode ZD1 is grounded, a pin 2 of the voltage stabilizing chip U1 is grounded, a pin 3 of the voltage stabilizing chip U1 is divided into two paths, one path is used as a voltage output end VCC2, the other path is grounded through a capacitor C5, the source of the MOS transistor Q1 is connected with one end of the cathode output end of the constant voltage output module, the drain electrode of the MOS tube Q1 is connected with the negative electrode connecting end of the LED lamp, the grid electrode of the MOS tube Q1 is connected with one end of a resistor R3, the other end of the resistor R3 is divided into two paths, one path is connected with the emitting electrode of a PNP type triode Q2, the other path is connected with the emitting electrode of an NPN type triode Q3, a node between one end of the resistor R3 and the grid electrode of the MOS tube Q1 is connected with a node between one end of the resistor R1 and the source electrode of the MOS tube Q1 through the resistor R2, the collector electrode of the PNP type triode Q2 is connected with a node between one end of the resistor R1 and the source electrode of the MOS tube Q1, the collector electrode of the NPN type triode Q3 is divided into two paths, one path is connected with the ground through a capacitor C6, the other path is connected with a voltage output end VCC1, one end of the resistor R4 is divided into two paths, one path is connected with the base electrode of the PNP type triode Q2, the other path is connected with the base electrode of the NPN type triode Q3, the other path is connected with the other pin 21 of the resistor R4, one end of the control chip U3, one end of the resistor R21 is divided into three paths, the first path is connected with a voltage output end VCC2, the second path is connected with one end of a capacitor C20, the third path is connected with a pin 4 of a control chip U3, the other end of the resistor R21 is divided into two paths, one path is connected with one end of a capacitor C28, the other path is connected with a pin 6 of the control chip U3, a pin 5 of the control chip U3 is divided into two paths, one path is connected with the other end of the capacitor C20, the other path is connected with the other end of the capacitor C28, one end of a capacitor C10 is divided into three paths, the first path is connected with a node between one end of a resistor R1 and a source electrode of a MOS (metal oxide semiconductor) tube Q1 through a resistor R11, the second path is grounded through a capacitor C13, the third path is connected with a pin 2 of an operational amplifier U2A, the other end of the capacitor C10 is divided into two paths, one path is connected with a pin 1 of the operational amplifier U2A, the other path is connected with a cathode of a diode D1, the anode of the diode D1, one path is divided into two paths, one path is connected with a voltage output end VCC2, the other path is connected with a pin 10 of a resistor R19, the pin 10 of the operational amplifier U3, and the pin 8 of the operational amplifier U2A is divided into two paths, one circuit is connected with a voltage output end VCC2, the other circuit is connected with the ground through a capacitor C11, a pin 4 of an operational amplifier U2A is connected with the ground, an anode of a voltage stabilizer U5 is connected with the ground, a reference end and a cathode of the voltage stabilizer U5 are connected together and then are divided into three circuits, the first circuit is connected with the voltage output end VCC2 through a resistor R14, the second circuit is connected with the ground through a capacitor C12, the third circuit is connected with one end of a resistor R16, the other end of the resistor R16 is divided into two circuits, one circuit is connected with a node between one end of the resistor R1 and a source electrode of a MOS tube Q1 through a resistor R10, the other circuit is connected with a pin 6 of an operational amplifier U2B, one end of the capacitor C14 is connected with a node between the other end of the resistor R16 and a pin 6 of the operational amplifier U2B, the other circuit is connected with a pin 7 of the operational amplifier U2B, the other circuit is connected with a cathode of a diode D2, an anode of the diode D2 is divided into two circuits, one circuit is connected with the voltage output end VCC2 through a resistor R18, the other circuit is connected with a pin 11 of a control chip U3, and one end of a resistor R13 is connected with the ground, the other end of the resistor R13 is divided into two paths, one path is connected with a pin 3 of the operational amplifier U2A, the other path is connected with one end of the resistor R12, the other end of the resistor R12 is divided into two paths, one path is connected with one end of the resistor R15, the other path is connected with a node between the cathode of the voltage stabilizer U5 and one end of the resistor R16, one end of the capacitor C30 is divided into three paths, the first path is connected with the other end of the resistor R15, one end of the second path is connected with one end of the resistor R17, the third path is connected with a pin 5 of the operational amplifier U2B, the other end of the capacitor C30 and the other end of the resistor R17 are connected together and then grounded, a pin 4 of the photoelectric coupler U4 is divided into two paths, one path is connected with a voltage output end VCC2 through a resistor R20, the other path is connected with a pin 7 of the control chip U3, a pin 3 of the photoelectric coupler U4 is grounded, a pin 1 of the photoelectric coupler U4 is connected with a collector of the PNP triode Q7 through the resistor R22, a base of the PNP triode Q7 is connected with a collector of the PNP type triode Q6, an emitter of the PNP type triode Q7 is connected with a positive electrode of the PNP type triode Q6 is connected with an anode output end of the rectifier BD1, the base electrode of the PNP type triode Q6 is divided into two paths, one path is connected with a node between the emitting electrode of the PNP type triode Q6 and the positive electrode output end of the rectifier bridge BD1 through a resistor R25, the other path is connected with the emitting electrode of the PNP type triode Q7, one input end of the rectifier bridge BD1 is connected with one connecting end of a DALI system through a resistor R28, the other input end is connected with the other connecting end of the DALI system, the base electrode of the PNP type triode Q6 is divided into two paths, one path is connected with a node between the emitting electrode of the PNP type triode Q6 and the positive electrode output end of the rectifier bridge BD1 through a resistor R25, the other path is connected with the emitting electrode of the PNP type triode Q7, one end of a resistor R23 is connected with a node between the base electrode of the PNP type triode Q7 and the collecting electrode of the PNP type triode Q6, the other end of the resistor R23 is connected with one end of a resistor R24, the other end of the resistor R24 is divided into two paths, one path is connected with the negative electrode output end of the rectifier bridge BD1, the other path is connected with one end of a capacitor C32, the 2 pins of the photoelectric coupling U4 are divided into three paths, the first path is connected with the cathode of a voltage stabilizing diode ZD3, the second path is connected with the 4 pin of the photoelectric coupling U6, the third path is connected with the other end of a capacitor C32, the drain electrode of an MOS tube Q8 is connected with a node between the emitting electrode of a PNP type triode Q6 and the anode output end of a rectifier bridge BD1, the grid electrode of the MOS tube Q8 is connected with one end of a resistor R26, the other end of the resistor R26 is divided into three paths, the first path is connected with one end of a capacitor C31, the second path is connected with one end of a resistor R27, and the third path is connected with the 3 pin of the photoelectric coupling U6, the source electrode of the MOS tube Q8, the other end of the capacitor C31 and the other end of the resistor R27 are connected with a node between the other end of the resistor R24 and the negative output end of the rectifier bridge BD1, the anode of the zener diode ZD3 is connected with a node between the other end of the resistor R24 and one end of the capacitor C32, the pin 1 of the photoelectric coupler U6 is connected with the voltage output end VCC2 through the resistor R21, the pin 2 of the photoelectric coupler U6 is connected with the pin 8 of the control chip U3, the node between the anode connecting end of the LED lamp and the anode output end of the constant voltage output module is connected with one end of the capacitor C1, and the node between the other end of the resistor R1 and the negative output end of the constant voltage output module is connected with the other end of the capacitor C1 and the ground.
The second load detection circuit has three technical schemes:
the first technical scheme is as follows: the second load detection circuit comprises a capacitor C7, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and an NPN triode Q4, one end of the resistor R6 is grounded, the other end of the resistor R6 is divided into two paths, one path is connected with a node between the source electrode of the MOS tube Q1 and the negative electrode connecting end of the LED lamp through the capacitor C7, the other path is connected with one end of the resistor R5, one end of the resistor R7 is divided into two paths, one path is connected with the other end of the resistor R5, the other path is connected with the base electrode of the NPN triode Q4, the emitting electrode of the NPN triode Q4 is grounded, a pin 25 of the control chip U3 is divided into two paths, one path is connected with the collector electrode of the NPN triode Q4, the other path is connected with one end of the resistor R8, the other end of the resistor R8 is divided into two paths, one path is connected with the other end of the resistor R7, and the other path is connected with a voltage output end VCC2.
The second technical scheme is as follows: the second load detection circuit comprises a resistor RS2, a PNP type triode QS2, a diode DS1, a resistor RS3, a resistor RS4 and an MOS (metal oxide semiconductor) tube QS1, wherein an emitting electrode of the PNP type triode QS2 is connected with a node between an anode connecting end and an anode output end of the LED lamp through the resistor RS2, a base electrode of the PNP type triode QS2 is connected with a cathode of the diode DS1, one end of the resistor RS3 is divided into two paths, one path is grounded, the other path is connected with a source electrode of the MOS tube QS1 through the resistor RS4, a 25 pin of the control chip U3 is divided into two paths, one path is connected with the other end of the resistor RS3, the other path is connected with a collector electrode of the PNP type triode QS2, an anode of the diode DS1 is divided into two paths, one path is connected with a drain electrode of the MOS tube QS1, and the other path is connected with a cathode connecting end of the LED lamp.
The third technical scheme is as follows: second load detection circuit includes resistance RT3, resistance RT4, MOS pipe QT1, electric capacity CT10, control chip U3's 25 pin divides two tunnel, connect resistance RT 3's one end all the way, another way connects electric capacity CT 10's one end, resistance RT 3's the other end divides two tunnel, ground connection all the way, another way connects resistance RT 4's one end, another termination MOS pipe QT 1's of resistance RT4 source electrode, electric capacity CT 10's the other end divides two tunnel, one way connects MOS pipe QT 1's drain electrode, another way connects the negative pole link of LED lamp.
Specifically, the effective signal is a low-level signal, the invalid signal is a high-level signal, no matter which technical scheme is adopted by the second load detection circuit, when a load exists and the ratio of the actual load to the rated load reaches a% to 100% (0 is equal to or less than a and equal to 100)), the loop current detection circuit extracts the output current of the output loop, the output current of the output loop is proportionally amplified, the operational amplifier U2B compares the output current with the standard current and then feeds back the low-level signal or the high-level signal to the MCU control circuit, the first load detection circuit outputs the low-level signal to the MCU control circuit, the MCU control circuit can determine that the ratio of the actual load to the rated load reaches a% to 100%, when the load exists and the ratio of the actual load to the rated load is less than a%, the first load detection circuit outputs the high-level signal to the MCU control circuit, once the MCU control circuit receives the high-level signal of the first load detection circuit, the MCU control circuit outputs a PWM signal with a duty ratio of B (0 is equal to or less than B and equal to 100), the second load detection circuit detects the voltage at the cathode connection end of the LED lamp and amplifies the load, the second load detection circuit can determine that the ratio of the second load detection circuit is equal to 100%, if the cathode connection of the MCU detection circuit and the load is equal to the sum of the load detection circuit, and the load detection circuit can not less than C, and the load detection circuit can determine that the load detection circuit.
The constant voltage output module has two technical schemes:
one technical scheme is as follows: the constant voltage output module comprises an alternating current to direct current circuit, and the alternating current to direct current circuit adopts a flyback isolation framework or an LLC resonance isolation framework to output constant voltage (in other words, the alternating current to direct current circuit is a constant voltage circuit adopting the flyback isolation framework or the LLC resonance isolation framework).
The other technical scheme is as follows: the constant voltage output module comprises a direct current to direct current conversion circuit, and the direct current to direct current conversion circuit adopts a voltage reduction type or flyback isolation structure and outputs constant voltage (in other words, the direct current to direct current conversion circuit adopts a constant voltage circuit of a voltage reduction type or flyback isolation structure).
The loop current detection circuit has two standby technical schemes:
one standby technical scheme is as follows: the loop current detection circuit is a resistor device with small resistance and high precision in an output loop or a mutual inductor device in the output loop, and the small resistance and the high precision can be defined according to actual requirements, such as manganin resistors.
The other alternative technical scheme is as follows: the LED brightness adjusting switch comprises an MOS tube Q1, and the loop current detection circuit comprises an on-resistance of the MOS tube Q1 during working.
The MCU control circuit judges the load condition according to the feedback signals of the first load detection circuit and the second load detection circuit, the first load detection circuit detects the load condition of an output loop and feeds back an effective signal to the MCU control circuit, the MCU control circuit judges that the output loop has a load according to the effective signal and evaluates the ratio of the actual load to a rated load (namely the load condition), if the first load detection circuit detects the load condition of the output loop and feeds back an invalid signal to the MCU control circuit, the MCU control circuit starts the second load detection circuit to detect the load condition of the output loop, the second load detection circuit feeds back a signal to the MCU control circuit, the MCU control circuit judges that the output loop has the load and evaluates the ratio of the actual load to the rated load, and when the first load detection circuit and the second load detection circuit do not feed back a signal to the MCU control circuit, the MCU control circuit judges that the output loop is in an idle state.
Specifically, the first load detection circuit firstly detects the output current of the output loop by using the loop current detection circuit, and then amplifies the output current in proportion; the first load detection circuit compares the output current with the standard current and then feeds back an effective signal or an ineffective signal to the MCU control circuit (the comparison of the output current with the standard current is realized by the operational amplifier U2B, the operational amplifier U2B outputs a high level signal or a low level signal, the low level signal is used as the effective signal, the high level signal is used as the ineffective signal, for example, the output current is greater than the standard current, the operational amplifier U2B outputs a low level signal, the output current is less than the standard current, and the operational amplifier U2B outputs a high level signal), the MCU control circuit judges that the output loop has a load and the ratio of the actual load to the rated load is greater than or equal to A and less than or equal to 100 after receiving the effective signal, the MCU control circuit outputs a PWM signal with the duty ratio of B to control the LED brightness adjusting switch after receiving the ineffective signal, the second load detection circuit detects the output voltage of the negative electrode connecting end of the load and feeds back the output voltage to the MCU control circuit, the duty ratio of the output voltage is C, if B + C =100, the MCU control circuit judges that the output loop has a load and the ratio of the actual load to the actual load and the actual load to the MCU control circuit is greater than 0 and less than the rated load and less than A; within a period of time (for example, within 10 seconds), the first load detection circuit and the second load detection circuit do not feed back a signal to the MCU control circuit, and the MCU control circuit judges that the output loop is in a no-load state.
The above embodiments do not limit the scope of the present invention, and those skilled in the art can make equivalent modifications and variations without departing from the overall concept of the present invention.
Claims (9)
1. A constant voltage LED driving power supply load detection circuit with a DALI function comprises a constant voltage output module, wherein the constant voltage output module is provided with an anode output end and a cathode output end, the anode output end of the constant voltage output module is electrically connected to an anode connecting end of a load, and the cathode output end of the constant voltage output module is electrically connected to a cathode connecting end of the load to form an output loop; the positive output end is also electrically connected to the input end of a power supply system, the output end of the power supply system is divided into two paths, one path is electrically connected to the power supply end of the first load detection circuit, and the other path is electrically connected to the power supply end of the MCU control circuit; the control signal end of the MCU control circuit is electrically connected to the control end of the LED brightness adjusting switch through a driving and abnormity protection circuit, and the input end of the driving and abnormity protection circuit is also connected to the negative electrode output end.
2. The constant voltage LED driver power supply load detection circuit with a DALI function as claimed in claim 1, wherein the communication terminal of the MCU control circuit is communicatively connected to a DALI system through a DALI interface circuit.
3. The constant voltage LED driving power supply load detecting circuit having a DALI function as claimed in claim 2, wherein the load is an LED lamp; the loop current detection circuit comprises a resistor R1, and the LED brightness adjusting switch comprises an MOS tube Q1, a resistor R2 and a resistor R3; the MCU control circuit comprises a control chip U3, a capacitor C20, a capacitor C28 and a capacitor R21, wherein the model of the control chip U3 is STM32G030; the driving and abnormal protection circuit comprises a resistor R11, a capacitor C13, a capacitor C10, an operational amplifier U2A, a capacitor C11, a resistor R19, a resistor R13, a resistor R12, a PNP type triode Q2, an NPN type triode Q3, a capacitor C6 and a resistor R4, wherein the model of the operational amplifier U2A is LM358; the first load detection circuit comprises a resistor R10, a resistor R14, a capacitor C12, a voltage stabilizer U5, a resistor R15, a resistor R16, a resistor R17, a capacitor C30, a capacitor C14, a diode D2, a resistor R18 and an operational amplifier U2B, wherein the model of the operational amplifier U2B is LM358; the power supply system comprises an NPN type triode Q5, a resistor R9, a voltage stabilizing diode ZD1, a capacitor C2, a capacitor C3, a voltage stabilizing chip U1 and a capacitor C5, wherein the model of the voltage stabilizing chip U1 is MD5333; the DALI interface circuit comprises a resistor R28, a rectifier bridge BD1, an MOS tube Q8, a resistor R26, a capacitor C31, a resistor R27, a PNP type triode Q6, a resistor R25, a resistor R23, a resistor R24, a PNP type triode Q7, a resistor R22, a zener diode ZD3, a capacitor C32, a photoelectric couple U4, a photoelectric couple U6, a resistor R21 and a resistor R20; the positive electrode connection end of the LED lamp is connected with the positive electrode output end of the constant voltage output module, the collector of the NPN type triode Q5 is divided into two paths, one path is connected with the positive electrode output end of the constant voltage output module, the other end is connected with one end of a resistor R9, the emitter of the NPN type triode Q5 is divided into three paths, the first path is grounded through a capacitor C3, the second path is connected with a pin 1 of a voltage stabilizing chip U1, the third path is used as a voltage output end VCC1, the base of the NPN type triode Q5 is divided into three paths, the first path is connected with the other end of the resistor R9, the second path is connected with the cathode of the voltage stabilizing diode ZD1, the third path is grounded through a capacitor C2, the positive electrode of the voltage stabilizing diode ZD1 is grounded, a pin 2 of the voltage stabilizing chip U1 is grounded, a pin 3 of the voltage stabilizing chip U1 is divided into two paths, one path is used as a voltage output end VCC2, the other path is grounded through a capacitor C5, the source of the MOS transistor Q1 is connected with one end of the cathode output end of the constant voltage output module, the drain electrode of the MOS tube Q1 is connected with the negative electrode connecting end of the LED lamp, the grid electrode of the MOS tube Q1 is connected with one end of a resistor R3, the other end of the resistor R3 is divided into two paths, one path is connected with the emitting electrode of a PNP type triode Q2, the other path is connected with the emitting electrode of an NPN type triode Q3, a node between one end of the resistor R3 and the grid electrode of the MOS tube Q1 is connected with a node between one end of the resistor R1 and the source electrode of the MOS tube Q1 through the resistor R2, the collector electrode of the PNP type triode Q2 is connected with a node between one end of the resistor R1 and the source electrode of the MOS tube Q1, the collector electrode of the NPN type triode Q3 is divided into two paths, one path is connected with the ground through a capacitor C6, the other path is connected with a voltage output end VCC1, one end of the resistor R4 is divided into two paths, one path is connected with the base electrode of the PNP type triode Q2, the other path is connected with the base electrode of the NPN type triode Q3, the other path is connected with the other pin 21 of the resistor R4, one end of the control chip U3, one end of the resistor R21 is divided into three paths, the first path is connected with a voltage output end VCC2, the second path is connected with one end of a capacitor C20, the third path is connected with a pin 4 of a control chip U3, the other end of the resistor R21 is divided into two paths, one path is connected with one end of a capacitor C28, the other path is connected with a pin 6 of the control chip U3, a pin 5 of the control chip U3 is divided into two paths, one path is connected with the other end of the capacitor C20, the other path is connected with the other end of the capacitor C28, one end of a capacitor C10 is divided into three paths, the first path is connected with a node between one end of a resistor R1 and a source electrode of an MOS tube Q1 through a resistor R11, the second path is grounded through a capacitor C13, the third path is connected with a pin 2 of an operational amplifier U2A, the other end of the capacitor C10 is divided into two paths, one path is connected with a pin 1 of the operational amplifier U2A, the other path is connected with a cathode of a diode D1, the anode of the diode D1 is divided into two paths, one path is connected with a pin of the resistor R19, one path is connected with a voltage output end VCC2, the other path is connected with a pin 10 of the control chip U3, the pin 10 of the operational amplifier U2A, and the pin 8 is divided into two paths, one path is connected with a voltage output end VCC2, the other path is connected with the ground through a capacitor C11, a pin 4 of an operational amplifier U2A is connected with the ground, an anode of a voltage stabilizer U5 is connected with the ground, a reference end and a cathode of the voltage stabilizer U5 are connected together and then divided into three paths, the first path is connected with the voltage output end VCC2 through a resistor R14, the second path is connected with the ground through a capacitor C12, one end of a third path is connected with one end of a resistor R16, the other end of the resistor R16 is divided into two paths, one path is connected with a node between one end of the resistor R1 and a source electrode of the MOS tube Q1 through a resistor R10, the other path is connected with a pin 6 of an operational amplifier U2B, one end of the capacitor C14 is connected with a node between the other end of the resistor R16 and a pin 6 of the operational amplifier U2B, the other path is connected with the other end of the capacitor C14, one path is connected with a pin 7 of the operational amplifier U2B, the other path is connected with a cathode of a diode D2, an anode of the diode D2 is divided into two paths, one path is connected with a pin of the resistor R18, one path is connected with the voltage output end of the VCC2, the other path is connected with a pin 11 of a control chip U3, and one end of the resistor R13 is connected with the ground, the other end of the resistor R13 is divided into two paths, one path is connected with a pin 3 of the operational amplifier U2A, the other path is connected with one end of the resistor R12, the other end of the resistor R12 is divided into two paths, one path is connected with one end of the resistor R15, the other path is connected with a node between the cathode of the voltage stabilizer U5 and one end of the resistor R16, one end of the capacitor C30 is divided into three paths, the first path is connected with the other end of the resistor R15, the second path is connected with one end of the resistor R17, the third path is connected with a pin 5 of the operational amplifier U2B, the other end of the capacitor C30 and the other end of the resistor R17 are connected together and then grounded, a pin 4 of the photoelectric coupler U4 is divided into two paths, one path is connected with a voltage output end VCC2 through a resistor R20, the other path is connected with a pin 7 of the control chip U3, a pin 3 of the photoelectric coupler U4 is grounded, a pin 1 of the photoelectric coupler U4 is connected with a collector of a PNP triode Q7 through a resistor R22, a base of the PNP triode Q6 is connected with a collector of the PNP triode Q6, and an emitter of the PNP triode Q1 is connected with an anode output end of the rectifier bridge BD1, the base electrode of the PNP type triode Q6 is divided into two paths, one path is connected with a node between the emitting electrode of the PNP type triode Q6 and the positive electrode output end of the rectifier bridge BD1 through a resistor R25, the other path is connected with the emitting electrode of the PNP type triode Q7, one input end of the rectifier bridge BD1 is connected with one connecting end of the DALI system through a resistor R28, the other input end is connected with the other connecting end of the DALI system, the base electrode of the PNP type triode Q6 is divided into two paths, one path is connected with a node between the emitting electrode of the PNP type triode Q6 and the positive electrode output end of the rectifier bridge BD1 through a resistor R25, the other path is connected with the emitting electrode of the PNP type triode Q7, one end of a resistor R23 is connected with a node between the base electrode of the PNP type triode Q7 and the collector electrode of the PNP type triode Q6, the other end of the resistor R23 is connected with one end of a resistor R24, the other end of the resistor R24 is divided, one path is connected with the negative electrode output end of the rectifier bridge BD1, the other path is connected with one end of a capacitor C32, the 2 pins of a photoelectric coupling U4 are divided into three paths, the first path is connected with the negative electrode of a voltage stabilizing diode ZD3, the second path is connected with the 4 pins of a photoelectric coupling U6, the third path is connected with the other end of a capacitor C32, the drain electrode of an MOS tube Q8 is connected with a node between the emitter electrode of a PNP type triode Q6 and the positive electrode output end of a rectifier bridge BD1, the grid electrode of the MOS tube Q8 is connected with one end of a resistor R26, the other end of the resistor R26 is divided into three paths, the first path is connected with one end of a capacitor C31, the second path is connected with one end of a resistor R27, the third path is connected with the 3 pins of the photoelectric coupling U6, the source electrode of the MOS tube Q8, the other end of the capacitor C31 and the other end of the resistor R27 are connected with a node between the other end of a resistor R24 and the negative electrode output end of the rectifier bridge BD1, the 1 pin of the voltage stabilizing diode ZD3 is connected with a node between the other end of the resistor R24 and one end of the capacitor C32, the 1 pin of the photoelectric coupling U6 is connected with a voltage output end of a VCC2 through a resistor R21, the 2 pin 2 of a chip VCC U6, the other end of a constant voltage stabilizing diode ZD output module is connected with the other end of a node of a constant voltage output module, and a negative electrode of a constant voltage output module, and a node of a constant voltage output module is connected with a node of the negative electrode of the capacitor C1 and a constant voltage output module, and a constant voltage output module.
4. The load detection circuit of the constant voltage LED driving power supply with the DALI function as claimed in claim 3, wherein the second load detection circuit includes a capacitor C7, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and an NPN triode Q4, one end of the resistor R6 is grounded, the other end is divided into two paths, one path is connected with a node between the source of the MOS transistor Q1 and the negative connection end of the LED lamp through the capacitor C7, the other path is connected with one end of the resistor R5, one end of the resistor R7 is divided into two paths, the other path is connected with the other end of the resistor R5, the other path is connected with the base of the NPN triode Q4, the emitter of the NPN triode Q4 is grounded, the pin 25 of the control chip U3 is divided into two paths, one path is connected with the collector of the NPN triode Q4, the other path is connected with one end of the resistor R8, the other end of the resistor R8 is divided, the other path is connected with the other end of the resistor R7, and the other path is connected with the voltage output end VCC2.
5. The load detection circuit of the constant voltage LED driving power supply with DALI function as claimed in claim 3, wherein the second load detection circuit includes a resistor RS2, a PNP transistor QS2, a diode DS1, a resistor RS3, a resistor RS4, and a MOS transistor QS1, wherein an emitter of the PNP transistor QS2 is connected to a node between the positive connection terminal of the LED lamp and the positive output terminal of the constant voltage output module through the resistor RS2, a base of the PNP transistor QS2 is connected to a negative terminal of the diode DS1, one terminal of the resistor RS3 is connected to two paths, one path is grounded, the other path is connected to a source of the MOS transistor QS1 through the resistor RS4, a 25-pin of the control chip U3 is connected to two paths, one path is connected to the other terminal of the resistor RS3, the other path is connected to a negative terminal of the PNP transistor QS2, an positive terminal of the diode DS1 is connected to two paths, one path is connected to a drain of the MOS transistor QS1, and the other path is connected to a negative connection terminal of the LED lamp.
6. The constant voltage LED driving power supply load detection circuit with the DALI function as claimed in claim 3, wherein the second load detection circuit comprises a resistor RT3, a resistor RT4, a MOS tube QT1 and a capacitor CT10, the 25 pins of the control chip U3 are divided into two paths, one path is connected with one end of the resistor RT3, the other path is connected with one end of the capacitor CT10, the other end of the resistor RT3 is divided into two paths, one path is grounded, the other path is connected with one end of the resistor RT4, the other end of the resistor RT4 is connected with the source electrode of the MOS tube QT1, the other end of the capacitor CT10 is divided into two paths, one path is connected with the drain electrode of the MOS tube QT1, and the other path is connected with the negative electrode connecting end of the LED lamp.
7. The constant voltage LED driving power supply load detection circuit with DALI function as claimed in claim 1, wherein the LED luminance adjustment switch includes an MOS transistor Q1, and the loop current detection circuit includes an on-resistance of the MOS transistor Q1 during operation.
8. The method for detecting the load of the constant voltage LED driving power supply with the DALI function is characterized in that the MCU control circuit judges the load condition according to the feedback signals of the first load detection circuit and the second load detection circuit, the first load detection circuit detects the load condition of the output loop and feeds back an effective signal to the MCU control circuit, the MCU control circuit judges that the output loop has a load and evaluates the ratio of the actual load to a rated load according to the effective signal, if the first load detection circuit detects the load condition of the output loop and feeds back an ineffective signal to the MCU control circuit, the MCU control circuit starts the second load detection circuit to detect the load condition of the output loop, the second load detection circuit feeds back a signal to the MCU control circuit, the MCU control circuit judges that the output loop has a load and evaluates the ratio of the actual load to the rated load, and when the first load detection circuit and the second load detection circuit do not have a feedback signal to the MCU control circuit, the MCU control circuit judges that the output loop is in an idle state.
9. The detection method according to claim 8, wherein the first load detection circuit first detects the output current of the output loop by using the loop current detection circuit and then scales up the output current; the first load detection circuit compares the output current with the standard current and then feeds back an effective signal or an invalid signal to the MCU control circuit, the MCU control circuit judges that the output loop has a load and the ratio of the actual load to the rated load is more than or equal to A and less than or equal to 100 after receiving the effective signal, the MCU control circuit outputs a PWM signal with the duty ratio of B to control the LED brightness adjusting switch after receiving the invalid signal, the second load detection circuit detects the output voltage of the negative connecting end of the load and feeds back the output voltage to the MCU control circuit, the duty ratio of the output voltage is C, if B + C =100, the MCU control circuit judges that the output loop has the load and the ratio of the actual load to the rated load is more than 0 and less than A; the first load detection circuit and the second load detection circuit do not have feedback signals to the MCU control circuit, and the MCU control circuit judges that the output loop is in an idle state.
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