CN115226274B - 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 PDF

Info

Publication number
CN115226274B
CN115226274B CN202210509088.4A CN202210509088A CN115226274B CN 115226274 B CN115226274 B CN 115226274B CN 202210509088 A CN202210509088 A CN 202210509088A CN 115226274 B CN115226274 B CN 115226274B
Authority
CN
China
Prior art keywords
resistor
path
capacitor
load
detection circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202210509088.4A
Other languages
Chinese (zh)
Other versions
CN115226274A (en
Inventor
傅焰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Baike Power Supply Co ltd
Original Assignee
Guangdong Baike Power Supply Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Baike Power Supply Co ltd filed Critical Guangdong Baike Power Supply Co ltd
Priority to CN202210509088.4A priority Critical patent/CN115226274B/en
Publication of CN115226274A publication Critical patent/CN115226274A/en
Application granted granted Critical
Publication of CN115226274B publication Critical patent/CN115226274B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The invention discloses a constant voltage LED driving power supply load detection circuit with a DALI function and a detection method thereof, 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 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, an LED brightness adjusting switch, an MCU control circuit and a driving and abnormal protection circuit, and the detection method is mainly used for judging the load condition according to feedback signals of the first load detection circuit and the second load detection circuit, so that the accuracy is high and the false judgment of the detection circuit of a high-power supply can be effectively prevented.

Description

Constant-voltage LED driving power supply load detection circuit with DALI function and detection method
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 the DALI function, the DALI system must detect the load condition of the power supply, such as whether the load of the output loop exists or not. When the constant voltage power supply has the DALI function to detect the load condition, the detection is generally realized by detecting the magnitude of the load current flowing through the output loop, the output current of the low-power DALI power supply is generally not large, but the output current of the high-power DALI power supply is relatively large, and the detection circuit can detect the condition of erroneous detection when the load of the output loop is small or no load is considered because the influence of the detection circuit on the overall power consumption is considered, for example, when the load current of the output loop is 10A, the detection circuit can detect the condition, but when the load current of the output loop is 0.01A, the detection circuit generally can hardly detect the condition.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the constant-voltage LED driving power supply load detection circuit with the DALI function, which has high accuracy.
The technical scheme adopted for solving the technical problems is as follows:
the constant voltage LED driving power supply load detection circuit with the 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, 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, which 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 the 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 of the output end is electrically connected to the power supply end of the first load detection circuit, and the other path of the output end 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 abnormality protection circuit, and the input end of the driving and abnormality protection circuit is also connected to the negative electrode output end.
Another object of the present invention is to provide a detection method of the constant voltage LED driving power load detection circuit with DALI function with high accuracy.
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 circuit and feeds back an effective signal to the MCU control circuit, the MCU control circuit judges the load of the output circuit according to the effective signal and evaluates the ratio of the actual load to the rated load, if the first load detection circuit detects the load condition of the output circuit 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 circuit, the second load detection circuit feeds back a signal to the MCU control circuit, the MCU control circuit judges the load of the output circuit 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 have no feedback signals to the MCU control circuit, the MCU control circuit judges that the output circuit is in an idle state.
The beneficial effects of the invention are as follows: 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 is 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 less than A%, the first load detection circuit can not detect the condition of the load and feed back an ineffective signal to the MCU control circuit, at the moment, the second load detection circuit detects the condition of the load and feeds back the signal to the MCU control circuit, and when no load exists, the first load detection circuit and the second load detection circuit can not detect the signal; the MCU control circuit is used for judging whether a load exists or not according to the existence of signals and judging the ratio of the actual load to the rated load according to the signals of the first load detection circuit or the second load detection circuit, so that when the ratio of the actual load to the rated load reaches A% to 100%, the conditions of no load and the ratio of the actual load to the rated load is lower than A%, can be identified, the accuracy is high, and the false judgment of the detection circuit of the high-power supply can be effectively prevented.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a system block diagram of the present invention;
FIG. 2 is a schematic circuit diagram of a power supply system, LED brightness adjustment switches, and drive and anomaly protection circuitry;
FIG. 3 is a circuit schematic of a first load detection circuit;
FIG. 4 is a circuit schematic of the DALI interface circuit;
FIG. 5 is a first circuit schematic of the second load detection circuit and MCU control circuit;
FIG. 6 is a second circuit schematic of a second load detection circuit and MCU control circuit;
FIG. 7 is a third circuit schematic of the second load detection circuit and 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 with DALI function and a detection method thereof include a constant voltage output module, wherein the constant voltage output module has a positive output end and a negative output end, the positive output end of the constant voltage output module is electrically connected to a positive connection end of a load, the negative output end of the constant voltage output module is electrically connected to a negative connection 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 adjustment switch, which are connected in series with the load, one input end of the second load detection circuit is electrically connected to the negative connection 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 the 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 of the output end is electrically connected to the power supply end of the first load detection circuit, and the other path of the output end 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 abnormality protecting circuit, the input end of the driving and abnormality protecting 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 DALI signals of the DALI system and sending the DALI signals 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 percent ((0 is less than or equal to A is 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 less than A%, the first load detection circuit can not detect the condition of the load and feed back an ineffective signal to the MCU control circuit, at the moment, the second load detection circuit detects the condition of the load and feeds back the signal to the MCU control circuit, and when no load exists, the first load detection circuit and the second load detection circuit can not detect the signal; the MCU control circuit is used for judging whether a load exists or not according to the existence of signals and judging the ratio of an actual load to a rated load according to the signals of the first load detection circuit or the second load detection circuit, can recognize that when the ratio of the actual load to the rated load reaches A% to 100%, the MCU control circuit can also recognize the conditions that no load exists 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 a high-power supply from misjudging, and 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 on-off of the LED lamp, when the MCU control circuit outputs PWM signals, the driving capability of the driving and abnormal protection circuit can be enhanced, the driving and abnormal protection circuit separates the MCU control circuit from the LED brightness adjusting switch to protect the safety of the MCU control circuit, and the driving and abnormal protection circuit generates protection when the abnormal conditions such as the short circuit of the LED lamp exist in the output loop, the constant voltage output module outputs a stable voltage.
The load is an LED lamp; the loop current detection circuit comprises a resistor R1, and the LED brightness adjusting switch comprises a 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 abnormality protecting 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 triode Q2, an NPN 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 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, a MOS tube Q8, a resistor R26, a capacitor C31, a resistor R27, a PNP triode Q6, a resistor R25, a resistor R23, a resistor R24, a PNP triode Q7, a resistor R22, a zener diode ZD3, a capacitor C32, a thermocouple U4, a thermocouple 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 electrode of the NPN 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 path is connected with one end of a resistor R9, the emitter electrode of the NPN triode Q5 is divided into three paths, the first path is grounded through a capacitor C3, the second path is connected with the 1 pin of a voltage stabilizing chip U1, the third path is used as a voltage output end VCC1, the base electrode of the NPN 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 negative electrode of a voltage stabilizing diode ZD1, the third path is grounded through a capacitor C2, the positive electrode of the voltage stabilizing diode ZD1 is grounded, the 3 pin 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 the capacitor C5, the source electrode of the MOS tube Q1 is connected with one end of the resistor R1, and the other path is connected with the negative electrode 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 emitter electrode of a PNP type triode Q2, the other path is connected with the emitter 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 the 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 voltage output end VCC1 through a capacitor C6, 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 end of the resistor R4 is connected with the 21 pin of a 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 4 pin of a control chip U3, the other end of a 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 6 pin of the control chip U3, a 5 pin 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 tube Q1 through a resistor R11, the second path is grounded through a capacitor C13, the third path is connected with a 2 pin of an operational amplifier U2A, the other end of the capacitor C10 is divided into two paths, one path is connected with a 1 pin 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, the other path is connected with a 10 pin of the control chip U3 through a resistor R19, one path is connected with a voltage output end VCC2, the other path is connected with the ground through a capacitor C11, the 4 pin of the operational amplifier U2A is connected with the ground, the anode of the voltage stabilizer U5 is connected with the ground, the reference end of the voltage stabilizer U5 and the cathode 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, the third path is connected with one end of a resistor R16, the other end of the resistor R16 is connected with a node between one end of a resistor R1 and the source of a MOS tube Q1, the other path is connected with the 6 pin of the operational amplifier U2B, one end of the capacitor C14 is connected with the other end of the resistor R16 and the 6 pin of the operational amplifier U2B, the other path is connected with the cathode of a diode D2, the positive electrode of the diode D2 is divided into two paths, one path is connected with the voltage output end VCC2 through a resistor R18, the other path is connected with the 11 pin of the control chip U3, and one end of the resistor R13 is grounded, the other end of the resistor R13 is divided into two paths, one path is connected with the 3 pin 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 the 5 pin of the operational amplifier U2B, the other end of the capacitor C30 and the other end of the resistor R17 are connected with the ground after being connected together, the 4 pin of the photoelectric coupler U4 is divided into two paths, one path is connected with the voltage output end VCC2 through the resistor R20, the other path is connected with the 7 pin of the control chip U3, the 1 pin of the photoelectric coupler U4 is grounded, the 1 pin of the photoelectric coupler U4 is connected with the collector of the PNP type triode Q7 through the resistor R22, the base of the PNP type triode Q7 is connected with the collector of the PNP type triode Q6, the positive output end of the PNP type triode Q6 is connected with the rectifying bridge BD1, the base electrode of PNP type triode Q6 is divided into two paths, one path is connected with the node between the emitter electrode of PNP type triode Q6 and the positive electrode output end of rectifier bridge BD1 through resistor R25, the other path is connected with the emitter electrode of PNP type triode Q7, one input end of rectifier bridge BD1 is connected with one connecting end of DALI system through resistor R28, the other input end is connected with the other connecting end of DALI system, the base electrode of PNP type triode Q6 is divided into two paths, one path is connected with the node between the emitter electrode of PNP type triode Q6 and the positive electrode output end of rectifier bridge BD1 through resistor R25, the other path is connected with the emitter electrode of PNP type triode Q7, one end of resistor R23 is connected with the node between the base electrode of PNP type triode Q7 and the collector electrode of PNP type triode Q6, the other end of resistor R24 is connected with one end of resistor R24, the other path is connected with the negative electrode output end of rectifier bridge BD1, the other path is connected with one end of capacitor C32, the 2 pins of the photoelectric coupler U4 are divided into three paths, the first path is connected with the cathode of the voltage stabilizing diode ZD3, the second path is connected with the 4 pins of the photoelectric couple U6, the third path is connected with the other end of the capacitor C32, the drain electrode of the MOS tube Q8 is connected with a node between the emitter of the PNP triode Q6 and one end of the rectifying bridge BD1, the grid electrode of the MOS tube Q8 is connected with one end of the resistor R26, the other end of the resistor R26 is divided into three paths, the first path is connected with one end of the capacitor C31, the second path is connected with one end of the resistor R27, the third path is connected with the 3 pin of the photoelectric coupler 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 cathode output end of the rectifying bridge BD1, the anode of the voltage stabilizing diode ZD3 is connected with one end of the capacitor C32, the 1 pin of the photoelectric coupler U6 is connected with the voltage output end 2 through the resistor R21, the 2 pin of the 2 of the photoelectric coupler U6 is connected with the 8 pin of the control chip U3, and the node between the anode of the LED lamp and the constant voltage output module is connected with the node between the cathode of the capacitor C1 and the constant voltage output end of the constant voltage output module.
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, wherein 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, the other 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 emitter of the NPN triode Q4 is grounded, the 25 pin 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 the voltage output end VCC2.
The second technical proposal 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 a MOS tube QS1, wherein an emitter 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, the other 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: the second load detection circuit comprises a resistor RT3, a resistor RT4, a MOS tube QT1 and a capacitor CT10, wherein 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 a source electrode of the MOS tube QT1, the other end of the capacitor CT10 is divided into two paths, one path is connected with a drain electrode of the MOS tube QT1, and the other path is connected with a negative electrode connecting end of the LED lamp.
Specifically, the effective signal is a low-level signal, the ineffective 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% (A is less than or equal to 0 and less than or equal to 100)), the loop current detection circuit extracts the output current of the output loop, the output current of the output loop is amplified in proportion, 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, then the MCU control circuit can judge that the ratio of the actual load to the rated load reaches A% to 100%, the ratio of the actual load to the rated load is less than A when the load is on the basis that the ratio of the actual load to the rated load is less than A, the ratio of the first load detection circuit outputs the high-level signal to the MCU control circuit, and once the MCU control circuit receives the high-level signal with the duty ratio of B (B is less than or equal to 0 and less than or equal to 100), the second load detection circuit detects the voltage at the negative electrode connection end of the LED lamp and the negative electrode is less than or equal to 100%, and when the ratio of the output of the load to C and the MCU control circuit to the actual load to C=is equal to 100, and the duty ratio of the actual load to the actual load to the load is not equal to 100.
The constant voltage output module has two technical schemes:
a technical scheme is as follows: the constant voltage output module comprises an alternating current-to-direct current circuit, wherein the alternating current-to-direct current circuit adopts a flyback isolation architecture or an LLC resonance isolation architecture and outputs constant voltage (in other words, the alternating current-to-direct current circuit is a constant voltage circuit adopting the flyback isolation architecture or the LLC resonance isolation architecture).
The other technical scheme is as follows: the constant voltage output module comprises a direct current-to-direct current circuit, wherein the direct current-to-direct current circuit adopts a buck or flyback isolation architecture and outputs constant voltage (in other words, the direct current-to-direct current circuit adopts a constant voltage circuit of the buck or flyback isolation architecture).
The loop current detection circuit has two standby technical schemes:
a 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 resistor device with small resistance and high precision can be defined according to actual needs, such as a manganese-copper resistor.
The other standby technical scheme is as follows: the LED brightness adjusting switch comprises a MOS tube Q1, and the loop current detection circuit comprises an on-resistance of the MOS tube Q1 when in operation.
The detection method of the constant voltage LED driving power supply load detection circuit with the DALI function 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 circuit and feeds back effective signals to the MCU control circuit, the MCU control circuit judges that the output circuit has a load according to the effective signals 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 circuit and feeds back ineffective signals to the MCU control circuit, the MCU control circuit starts the second load detection circuit to detect the load condition of the output circuit, the second load detection circuit feeds back signals to the MCU control circuit, the MCU control circuit judges that the output circuit 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 have no feedback signals to the MCU control circuit, the MCU control circuit judges that the output circuit is in an idle state.
Specifically, the first load detection circuit detects the output current of the output loop by using the loop current detection circuit, and then amplifies the output current proportionally; 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 and the standard current is realized through the operational amplifier U2B, the operational amplifier U2B outputs a high-level signal or a low-level signal, the low-level signal is taken as the effective signal, the high-level signal is taken as the ineffective signal, for example, the output current is larger than the standard current, the operational amplifier U2B outputs a low-level signal, the output current is smaller than the standard current, the operational amplifier U2B outputs a high-level signal), the MCU control circuit receives the effective signal, then the MCU control circuit judges that the output circuit has a load, the ratio of the actual load to the rated load is larger than or equal to A and smaller than or equal to 100, the MCU control circuit receives the ineffective signal and then outputs a PWM signal with the duty ratio of B to control the LED brightness adjusting switch, the second load detection circuit detects the output voltage of the negative electrode connection end of the load and feeds back to the MCU control circuit, the duty ratio of the output voltage is C to be equal to C, and if B+C=100, the MCU control circuit judges that the output circuit has a load and the ratio of the actual load to the rated load is larger than 0 and smaller than A. In a period of time (for example, within 10 seconds), 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.
The above embodiments do not limit the protection scope of the invention, and those skilled in the art can make equivalent modifications and variations without departing from the whole inventive concept, and they still fall within the scope of the invention.

Claims (9)

1. The constant voltage LED driving power supply load detection circuit with the 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 the cathode connecting end of the load to form an output loop; 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 of the output end is electrically connected to the power supply end of the first load detection circuit, and the other path of the output end 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 abnormality protection circuit, and the input end of the driving and abnormality protection circuit is also connected to the negative electrode output end.
2. The constant voltage LED driving power supply load detection circuit with the DALI function according to claim 1, wherein the communication end of the MCU control circuit is in communication connection with a DALI system through a DALI interface circuit.
3. The constant voltage LED driving power supply load detection circuit with DALI function according to claim 2, characterized in that the load is an LED lamp; the loop current detection circuit comprises a resistor R1, and the LED brightness adjusting switch comprises a 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 resistor R21, wherein the model of the control chip U3 is STM32G030; the driving and abnormality protecting 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 triode Q2, an NPN 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 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, a MOS tube Q8, a resistor R26, a capacitor C31, a resistor R27, a PNP triode Q6, a resistor R25, a resistor R23, a resistor R24, a PNP triode Q7, a resistor R22, a zener diode ZD3, a capacitor C32, a thermocouple U4, a thermocouple 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 electrode of the NPN 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 path is connected with one end of a resistor R9, the emitter electrode of the NPN triode Q5 is divided into three paths, the first path is grounded through a capacitor C3, the second path is connected with the 1 pin of a voltage stabilizing chip U1, the third path is used as a voltage output end VCC1, the base electrode of the NPN 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 negative electrode of a voltage stabilizing diode ZD1, the third path is grounded through a capacitor C2, the positive electrode of the voltage stabilizing diode ZD1 is grounded, the 3 pin 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 the capacitor C5, the source electrode of the MOS tube Q1 is connected with one end of the resistor R1, and the other path is connected with the negative electrode 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 emitter electrode of a PNP type triode Q2, the other path is connected with the emitter 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 the 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 voltage output end VCC1 through a capacitor C6, 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 end of the resistor R4 is connected with the 21 pin of a 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 4 pin of a control chip U3, the other end of a 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 6 pin of the control chip U3, a 5 pin 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 tube Q1 through a resistor R11, the second path is grounded through a capacitor C13, the third path is connected with a 2 pin of an operational amplifier U2A, the other end of the capacitor C10 is divided into two paths, one path is connected with a 1 pin 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, the other path is connected with a 10 pin of the control chip U3 through a resistor R19, one path is connected with a voltage output end VCC2, the other path is connected with the ground through a capacitor C11, the 4 pin of the operational amplifier U2A is connected with the ground, the anode of the voltage stabilizer U5 is connected with the ground, the reference end of the voltage stabilizer U5 and the cathode 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, the third path is connected with one end of a resistor R16, the other end of the resistor R16 is connected with a node between one end of a resistor R1 and the source of a MOS tube Q1, the other path is connected with the 6 pin of the operational amplifier U2B, one end of the capacitor C14 is connected with the other end of the resistor R16 and the 6 pin of the operational amplifier U2B, the other path is connected with the cathode of a diode D2, the positive electrode of the diode D2 is divided into two paths, one path is connected with the voltage output end VCC2 through a resistor R18, the other path is connected with the 11 pin of the control chip U3, and one end of the resistor R13 is grounded, the other end of the resistor R13 is divided into two paths, one path is connected with the 3 pin 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 the 5 pin of the operational amplifier U2B, the other end of the capacitor C30 and the other end of the resistor R17 are connected with the ground after being connected together, the 4 pin of the photoelectric coupler U4 is divided into two paths, one path is connected with the voltage output end VCC2 through the resistor R20, the other path is connected with the 7 pin of the control chip U3, the 1 pin of the photoelectric coupler U4 is grounded, the 1 pin of the photoelectric coupler U4 is connected with the collector of the PNP type triode Q7 through the resistor R22, the base of the PNP type triode Q7 is connected with the collector of the PNP type triode Q6, the positive output end of the PNP type triode Q6 is connected with the rectifying bridge BD1, the base electrode of PNP type triode Q6 is divided into two paths, one path is connected with the node between the emitter electrode of PNP type triode Q6 and the positive electrode output end of rectifier bridge BD1 through resistor R25, the other path is connected with the emitter electrode of PNP type triode Q7, one input end of rectifier bridge BD1 is connected with one connecting end of DALI system through resistor R28, the other input end is connected with the other connecting end of DALI system, the base electrode of PNP type triode Q6 is divided into two paths, one path is connected with the node between the emitter electrode of PNP type triode Q6 and the positive electrode output end of rectifier bridge BD1 through resistor R25, the other path is connected with the emitter electrode of PNP type triode Q7, one end of resistor R23 is connected with the node between the base electrode of PNP type triode Q7 and the collector electrode of PNP type triode Q6, the other end of resistor R24 is connected with one end of resistor R24, the other path is connected with the negative electrode output end of rectifier bridge BD1, the other path is connected with one end of capacitor C32, the 2 pins of the photoelectric coupler U4 are divided into three paths, the first path is connected with the cathode of the voltage stabilizing diode ZD3, the second path is connected with the 4 pins of the photoelectric couple U6, the third path is connected with the other end of the capacitor C32, the drain electrode of the MOS tube Q8 is connected with a node between the emitter of the PNP triode Q6 and one end of the rectifying bridge BD1, the grid electrode of the MOS tube Q8 is connected with one end of the resistor R26, the other end of the resistor R26 is divided into three paths, the first path is connected with one end of the capacitor C31, the second path is connected with one end of the resistor R27, the third path is connected with the 3 pin of the photoelectric coupler 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 cathode output end of the rectifying bridge BD1, the anode of the voltage stabilizing diode ZD3 is connected with one end of the capacitor C32, the 1 pin of the photoelectric coupler U6 is connected with the voltage output end 2 through the resistor R21, the 2 pin of the 2 of the photoelectric coupler U6 is connected with the 8 pin of the control chip U3, and the node between the anode of the LED lamp and the constant voltage output module is connected with the node between the cathode of the capacitor C1 and the constant voltage output end of the constant voltage output module.
4. The constant voltage LED driving power supply load detection circuit with the DALI function according to claim 3, wherein 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 a source electrode of the MOS tube Q1 and a negative electrode connecting end of an 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 a base electrode of the NPN triode Q4, an emitter electrode of the NPN triode Q4 is grounded, a 25 pin of the control chip U3 is divided into two paths, one path is connected with a 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, and the other path is connected with the other end of the resistor R7.
5. The constant voltage LED driving power supply load detection circuit with the DALI function according to claim 3, wherein the second load detection circuit comprises a resistor RS2, a PNP type triode QS2, a diode DS1, a resistor RS3, a resistor RS4 and a MOS tube QS1, wherein an emitter of the PNP type triode QS2 is connected with a node between an anode connecting end of an LED lamp and an anode output end of a constant voltage output module through the resistor RS2, a base 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 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 of the PNP type triode QS2, the anode of the diode DS1 is divided into two paths, and the other path is connected with a drain of the MOS tube QS1 and the other path is connected with a cathode connecting end of the LED lamp.
6. The constant voltage LED driving power supply load detection circuit with the DALI function according to claim 3, wherein the second load detection circuit comprises a resistor RT3, a resistor RT4, a MOS tube QT1 and a capacitor CT10, 25 pins of a 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 a source electrode of the MOS tube QT1, the other end of the capacitor CT10 is divided into two paths, one path is connected with a drain electrode of the MOS tube QT1, and the other path is connected with a negative electrode connecting end of the LED lamp.
7. The constant voltage LED driving power supply load detection circuit with the DALI function according to claim 1, wherein the LED brightness adjusting switch comprises a MOS tube Q1, and the loop current detection circuit comprises an on-resistance of the MOS tube Q1 when in operation.
8. A detection method of a constant voltage LED driving power supply load detection circuit with a DALI function based on any one of claims 1 to 7 is characterized by comprising the 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 back an effective signal to the MCU control circuit, the MCU control circuit judges the load condition of the output loop according to the effective signal and evaluates the ratio of an actual load to a rated load, 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 a second load detection circuit to detect the load condition of the output loop, the MCU control circuit feeds back a signal to the MCU control circuit, the MCU control circuit judges the load condition of the output loop 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 have no feedback signals to the MCU control circuit, the MCU control circuit judges that the output loop is in an idle state.
9. The detecting method according to claim 8, wherein the first load detecting circuit detects the output current of the output circuit by using the loop current detecting circuit, and then amplifies the output current proportionally; 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 MCU control circuit judges that the output circuit 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 100,0 < A is less than or equal to 100, the MCU control circuit receives the ineffective signal and then outputs a PWM signal with the duty ratio of B to control the LED brightness adjusting switch, 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, and if B+C=100, the MCU control circuit judges that the output circuit has a 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.
CN202210509088.4A 2022-05-11 2022-05-11 Constant-voltage LED driving power supply load detection circuit with DALI function and detection method Active CN115226274B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210509088.4A CN115226274B (en) 2022-05-11 2022-05-11 Constant-voltage LED driving power supply load detection circuit with DALI function and detection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210509088.4A CN115226274B (en) 2022-05-11 2022-05-11 Constant-voltage LED driving power supply load detection circuit with DALI function and detection method

Publications (2)

Publication Number Publication Date
CN115226274A CN115226274A (en) 2022-10-21
CN115226274B true CN115226274B (en) 2023-12-19

Family

ID=83608818

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210509088.4A Active CN115226274B (en) 2022-05-11 2022-05-11 Constant-voltage LED driving power supply load detection circuit with DALI function and detection method

Country Status (1)

Country Link
CN (1) CN115226274B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116338509B (en) * 2023-03-20 2023-08-29 武汉芯必达微电子有限公司 Test method and test circuit for rapidly-changing power supply signal

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201039525A (en) * 2009-04-30 2010-11-01 wen-zhi Wu Loop control system with functions of zero standby power, overload protection, wireless remote control of switch, electricity consumption display, and conducting energy management through computer
CN103326587A (en) * 2013-07-17 2013-09-25 潘海铭 Light load control method and device of LLC (Liquid Level Control) resonant converter
CN103379701A (en) * 2012-04-26 2013-10-30 海洋王（东莞）照明科技有限公司 LED driving circuit and LED lamp
JP2014107958A (en) * 2012-11-28 2014-06-09 Mitsubishi Electric Corp Power supply device and luminaire
CN105576766A (en) * 2016-02-18 2016-05-11 矽力杰半导体技术(杭州)有限公司 Automatic load detection circuit and mobile power supply applying the circuit
CN108054918A (en) * 2017-11-20 2018-05-18 华为数字技术（苏州）有限公司 A kind of control method, control circuit and the system of four pipes BUCK-BOOST circuits
US10136482B1 (en) * 2018-01-23 2018-11-20 Philips Lighting Holding B.V. Lighting driver, lighting system and control method
JP2020071930A (en) * 2018-10-29 2020-05-07 パナソニックＩｐマネジメント株式会社 Lighting system, illumination control system, and illumination fixture
CN212183779U (en) * 2020-05-26 2020-12-18 浙江阳光美加照明有限公司 LED drive circuit with multipath output automatic adjustment function
CN112701993A (en) * 2020-12-22 2021-04-23 高新现代智能系统股份有限公司 Motor overload detection circuit, motor control circuit and motor
CN113037106A (en) * 2021-02-03 2021-06-25 北京广联宏伟科技股份有限公司 Current feedback control method and system for load-end constant-voltage rectification power supply
CN213816649U (en) * 2020-12-04 2021-07-27 深圳市索卡科技有限公司 Power strip

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8427123B2 (en) * 2009-07-08 2013-04-23 Microchip Technology Incorporated System, method and apparatus to transition between pulse width modulation and pulse-frequency modulation in a switch mode power supply
CN104349560B (en) * 2013-08-01 2019-05-10 欧司朗有限公司 Fault detection means and its operation method for street lamp illumination system

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201039525A (en) * 2009-04-30 2010-11-01 wen-zhi Wu Loop control system with functions of zero standby power, overload protection, wireless remote control of switch, electricity consumption display, and conducting energy management through computer
CN103379701A (en) * 2012-04-26 2013-10-30 海洋王（东莞）照明科技有限公司 LED driving circuit and LED lamp
JP2014107958A (en) * 2012-11-28 2014-06-09 Mitsubishi Electric Corp Power supply device and luminaire
CN103326587A (en) * 2013-07-17 2013-09-25 潘海铭 Light load control method and device of LLC (Liquid Level Control) resonant converter
CN105576766A (en) * 2016-02-18 2016-05-11 矽力杰半导体技术(杭州)有限公司 Automatic load detection circuit and mobile power supply applying the circuit
CN108054918A (en) * 2017-11-20 2018-05-18 华为数字技术（苏州）有限公司 A kind of control method, control circuit and the system of four pipes BUCK-BOOST circuits
US10136482B1 (en) * 2018-01-23 2018-11-20 Philips Lighting Holding B.V. Lighting driver, lighting system and control method
JP2020071930A (en) * 2018-10-29 2020-05-07 パナソニックＩｐマネジメント株式会社 Lighting system, illumination control system, and illumination fixture
CN212183779U (en) * 2020-05-26 2020-12-18 浙江阳光美加照明有限公司 LED drive circuit with multipath output automatic adjustment function
CN213816649U (en) * 2020-12-04 2021-07-27 深圳市索卡科技有限公司 Power strip
CN112701993A (en) * 2020-12-22 2021-04-23 高新现代智能系统股份有限公司 Motor overload detection circuit, motor control circuit and motor
CN113037106A (en) * 2021-02-03 2021-06-25 北京广联宏伟科技股份有限公司 Current feedback control method and system for load-end constant-voltage rectification power supply

Also Published As

Publication number Publication date
CN115226274A (en) 2022-10-21

Similar Documents

Publication Publication Date Title
CN115226274B (en) Constant-voltage LED driving power supply load detection circuit with DALI function and detection method
CN109342973B (en) Direct current power supply input state monitoring circuit and system
CN105050295A (en) Over-temperature protection circuit of light-emitting diode (LED) drive power supply
CN204887621U (en) LED drive power supply&#39;s excess temperature protection circuit
CN113506706B (en) Contactor driving circuit with high reliability and working method
CN211860608U (en) Intelligent control system for multi-color temperature LED street lamp
CN212905381U (en) Live wire zero line ground wire of alternating-current charging stake connects wrong detection circuitry
CN103457464A (en) Current limiting circuit on basis of switching power supplies
CN214043036U (en) Power switch control system of LED display screen
CN213693458U (en) Output overvoltage protection circuit of switching power supply
CN209914140U (en) LED dimming circuit and device
CN221550891U (en) Power output short circuit detection circuit and power supply
CN210112322U (en) Power-adjustable LED driving power supply
CN216121778U (en) Low-cost overcurrent protection circuit of sensor
CN213694252U (en) Overvoltage protection circuit, power supply and electronic equipment
CN218387303U (en) Low-power consumption switching power supply circuit
CN112014621A (en) Current detection circuit, switching power supply and television
CN219554573U (en) Overcurrent time-delay protection circuit
CN217935459U (en) Switching power supply with detection function
CN212627147U (en) Overcurrent protection circuit applied to frequency converter
CN211406381U (en) LED module driver
CN217034092U (en) Alternating voltage detection circuit for inhibiting temperature drift of photoelectric coupler
CN213818302U (en) Lamp and regulating and controlling circuit thereof
CN216720918U (en) Magnetic control box
CN219833773U (en) Power supply control system of bathroom product

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant