WO2022082890A1 - Circuit d'attaque d'éclairage à commutation à courant alternatif et à courant continu et lampe - Google Patents

Circuit d'attaque d'éclairage à commutation à courant alternatif et à courant continu et lampe Download PDF

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Publication number
WO2022082890A1
WO2022082890A1 PCT/CN2020/127920 CN2020127920W WO2022082890A1 WO 2022082890 A1 WO2022082890 A1 WO 2022082890A1 CN 2020127920 W CN2020127920 W CN 2020127920W WO 2022082890 A1 WO2022082890 A1 WO 2022082890A1
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WIPO (PCT)
Prior art keywords
circuit
resistor
power
capacitor
voltage
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PCT/CN2020/127920
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English (en)
Chinese (zh)
Inventor
李胜森
罗杨洋
杨林
杨海涛
Original Assignee
深圳市豪恩智能物联股份有限公司
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Publication of WO2022082890A1 publication Critical patent/WO2022082890A1/fr

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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]
    • H05B45/10—Controlling the intensity of the light
    • 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
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • 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
    • 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
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the present application relates to the technical field of lighting, and in particular to an AC-DC switching lighting drive circuit and a lamp.
  • the general lighting circuit can be used in the 198-264V DC emergency system, but it can only be fully loaded, and has no power reduction function, so it does not save energy; the general lighting circuit with its own dimming function , dimming through pulse width modulation signal PWM, or dimming through external 0-10V dimming module, the dimming method cannot meet the application needs of the majority of the market, and in some application environments without 0-10V dimming control board, dimming The cost of light function is high, so that in the DC emergency system 198-264V, even if there is a dimming function, it cannot meet the lighting needs of the emergency system, because the emergency lighting system design specification standard clearly stipulates that different occasions should be designed with reference to the emergency system specification standards, such as Some applications do not allow emergency lighting circuits to set sockets, some emergency lighting is strictly forbidden to use dimming devices, and some require the workplace: the illuminance of safety lighting is not less than 5% of the general lighting illuminance in the occasion, and the illumina
  • the lighting circuit can be used in the DC emergency system 198-264V, but it can only be fully loaded and has no power reduction function, so it cannot meet the design specifications of the emergency lighting system.
  • One of the purposes of the embodiments of the present application is to provide an AC-DC switching lighting drive circuit and a lamp, which aims to solve the problem in the traditional technical solution that the lighting circuit can be used in the DC emergency system 198-264V, but it can only be fully loaded without reducing the voltage.
  • the power function cannot meet the design specification standard of emergency lighting system.
  • an AC-DC switching lighting driving circuit which is connected to a load, and the AC-DC switching lighting driving circuit includes:
  • an input power circuit configured to provide a power supply voltage signal
  • a rectification circuit connected to the input power supply circuit, and configured to perform rectification processing on the power supply voltage signal to generate a rectified voltage signal
  • a transformer power conversion circuit connected to the rectification circuit, is configured to perform voltage conversion processing on the rectified voltage signal to generate a driving voltage signal, and adjust the driving voltage signal according to a driving control signal; the driving voltage signal for driving the load for lighting;
  • a voltage sampling circuit connected to the rectification circuit, configured to perform voltage sampling on the rectified voltage signal to generate a voltage sampling signal
  • a comparison circuit connected to the voltage sampling circuit, configured to generate a power adjustment enable signal according to the voltage sampling signal being lower than a reference voltage signal
  • a power control circuit connected to the comparison circuit and the transformer power conversion circuit, is configured to generate the drive control signal according to the power adjustment enable signal.
  • the transformer power conversion circuit is further configured to perform voltage conversion processing on the rectified voltage signal to generate an auxiliary power supply voltage
  • the AC-DC switching lighting drive circuit further includes:
  • a reference voltage generation circuit connected to the transformer power conversion circuit and the comparison circuit, is configured to generate the reference voltage signal according to the auxiliary power supply voltage.
  • the AC-DC switching lighting driving circuit further includes:
  • a voltage divider power supply circuit connected to the rectifier circuit, the transformer power conversion circuit and the power control circuit, and configured to generate a first power supply voltage according to the rectified voltage signal and the auxiliary power supply voltage, to Power control circuit power supply.
  • a lighting fixture comprising the AC-DC switching lighting driving circuit according to any one of the above.
  • the power supply voltage signal is provided through the input power supply circuit; the rectification circuit rectifies the power supply voltage signal to generate the rectified voltage signal; the transformer power conversion circuit rectifies the rectification
  • the voltage signal is subjected to voltage conversion processing to generate a driving voltage signal, and the driving voltage signal is adjusted according to the driving control signal;
  • the driving voltage signal is used to drive the load;
  • the voltage sampling circuit performs voltage sampling on the rectified voltage signal to generate a voltage sampling signal;
  • the comparison circuit generates a power adjustment enable signal according to the voltage sampling signal lower than the reference voltage signal;
  • the power control circuit generates a drive control signal according to the power adjustment enable signal; realizes that when the AC mains is connected, the output drive voltage signal is not power adjusted , so that the driving voltage signal outputting full load power supplies power to the load;
  • the DC power supply voltage signal provided by the lighting emergency DC power supply is connected, the driving voltage signal output to the load is adjusted to automatically detect the AC power supply voltage
  • Signal and DC power voltage signal can be used normally when connected to different power supply voltage signals; at the same time, when connected to the lighting emergency DC power supply for use, the power corresponding to the driving voltage signal can be adjusted to reduce lighting power consumption, The use time of the emergency DC power supply is prolonged, and the emergency lighting system design specification standard is met, the cost is saved, and the practicability of the lighting driving power circuit is improved.
  • FIG. 1 is a schematic structural diagram of an AC-DC switching lighting drive circuit provided by an embodiment of the application
  • FIG. 2 is another schematic structural diagram of an AC-DC switching lighting drive circuit provided by an embodiment of the present application.
  • FIG. 3 is another schematic structural diagram of an AC-DC switching lighting driving circuit provided by an embodiment of the present application.
  • FIG. 4 is another schematic structural diagram of an AC-DC switching lighting drive circuit provided by an embodiment of the present application.
  • FIG. 5 is another schematic structural diagram of an AC-DC switching lighting driving circuit according to an embodiment of the present application.
  • FIG. 6 is an exemplary circuit schematic diagram of an AC-DC switching lighting drive circuit provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram illustrating the relationship between the voltage value of the power adjustment enable signal and the power percentage of the adjustment driving voltage signal.
  • FIG. 1 shows a schematic structural diagram of an AC-DC switching lighting driving circuit provided by a preferred embodiment of the present application. For the convenience of description, only the parts related to this embodiment are shown, and the details are as follows:
  • the AC-DC switching lighting drive circuit is connected to a load 100.
  • the AC-DC switching lighting drive circuit includes: an input power supply circuit 01, a rectifier circuit 11, a transformer power conversion circuit 12, a voltage sampling circuit 13, a comparison circuit 14 and a power control circuit 15.
  • the input power supply circuit 01 is configured to provide a power supply voltage signal; the rectification circuit 11 is connected to the input power supply circuit 01 and configured to rectify the power supply voltage signal to generate a rectified voltage signal; the transformer power conversion circuit 12 is connected to the rectification circuit 11 , configured to perform voltage conversion processing on the rectified voltage signal to generate a driving voltage signal, and adjust the driving voltage signal according to the driving control signal; the driving voltage signal is used to drive the load 100 to illuminate; the voltage sampling circuit 13, and the rectifying circuit 11 is connected, configured to perform voltage sampling on the rectified voltage signal to generate a voltage sampling signal; a comparison circuit 14, connected to the voltage sampling circuit 13, is configured to generate a power adjustment enable signal according to the voltage sampling signal being lower than the reference voltage signal ; The power control circuit 15, connected with the comparison circuit 14 and the transformer power conversion circuit 12, is configured to generate a drive control signal according to the power adjustment enable signal.
  • the load 100 is a lighting module, such as an LED light source module.
  • the input power supply circuit 01 is used to provide a power supply voltage signal, including an AC power supply voltage signal, such as AC 198-264V; and also includes a DC power supply voltage signal, such as DC 198-264V.
  • the rectifier circuit 11 can rectify the input AC power supply voltage signal to generate a rectified voltage signal, for example, convert a 50Hz sine wave AC power into a unidirectional pulsating DC voltage/current with a frequency of 100Hz, and rectify the AC 198-264V
  • the voltage value range obtained after rectification is 279-373.4V; the rectification processing of the DC power supply voltage signal by the rectification circuit 11 is specifically: performing anti-reverse processing on the DC power supply voltage signal to generate a rectified voltage signal.
  • the voltage sampling circuit 13 samples the rectified voltage signal to generate a voltage sampling signal, and indirectly implements detection and sampling of the power supply voltage signal.
  • the comparison circuit 14 compares the voltage sampling signal with the reference voltage signal.
  • the voltage sampling signal is higher than the reference voltage signal, and the comparison circuit 14 is not higher than the reference voltage signal according to the voltage sampling signal.
  • the output driving voltage signal is adjusted.
  • the transformer power conversion circuit 12 directly performs voltage conversion processing on the rectified voltage signal to generate a driving voltage signal, and drives the load 100 to emit light to perform full-load power operation, and the luminous flux meets the lighting application requirements; when the input power supply When the DC power supply voltage signal is provided by the circuit 01, the maximum voltage value of the DC power supply voltage signal is 264V, which is less than 276 V, the corresponding voltage sampling signal is lower than the reference voltage signal, and the comparison circuit 14 is generated according to the voltage sampling signal lower than the reference voltage signal An effective power adjustment enable signal, such as a relatively low-level enable signal, controls the power control circuit 15 to generate and output a drive control signal, and controls the transformer power conversion circuit 12 to adjust the output drive voltage signal by adjusting the drive voltage signal.
  • an effective power adjustment enable signal such as a relatively low-level enable signal, controls the power control circuit 15 to generate and output a drive control signal, and controls the transformer power conversion circuit 12 to adjust the output drive voltage signal by adjusting the drive voltage signal.
  • Corresponding power thereby adjusting the driving power of the driving load 100.
  • the power corresponding to the output driving voltage signal is 20% of the full load power.
  • the power generated by the transformer power conversion circuit 12 according to the emergency DC198-264V is the full load power. 20% (that is, one-fifth of the full load power) of the driving voltage signal to drive the load 100 for normal emergency lighting work.
  • the reference voltage signal is a 2.5V reference voltage.
  • the driving control signal is a pulse width modulation signal, that is, a PWM signal, and different power adjustments to the driving voltage signal are realized by adjusting different duty ratios of the driving control signal.
  • the embodiment of the present application can realize that when the AC mains (for example, AC 198-264V) is connected, the output driving voltage signal is not power adjusted, so that the driving voltage signal outputting full load power can supply power to the load; when connecting to the lighting emergency DC power supply
  • the provided DC power supply voltage such as DC 198-264V
  • the power corresponding to the output driving voltage signal is adjusted to automatically detect the AC power supply voltage signal and the DC power supply voltage signal, and can be connected to different power supply voltage signals.
  • the purpose of normal use at the same time, when the emergency lighting DC power supply is connected for use, the power of the driving voltage signal can be adjusted, the lighting power consumption can be reduced, the use time of the emergency DC power supply can be prolonged, and the emergency lighting system design specification standard can be saved.
  • the cost increases the practicability of the lighting driving power circuit.
  • the transformer power conversion circuit 12 is further configured to perform voltage conversion processing on the rectified voltage signal to generate an auxiliary supply voltage; the AC-DC switching lighting driving circuit further includes a reference voltage generating circuit 16 .
  • the reference voltage generation circuit 16 connected to the transformer power conversion circuit 12 and the comparison circuit 14, is configured to generate a reference voltage signal according to the auxiliary power supply voltage.
  • the reference voltage signal is obtained by the reference voltage generation circuit 16 performing voltage division and voltage stabilization on the auxiliary power supply voltage, wherein the auxiliary power supply voltage is generated by the voltage conversion processing of the rectified voltage signal by the transformer power conversion circuit 12, so as to pass
  • the internal circuit obtains a reference voltage signal, which is used as a comparison benchmark for power adjustment of the driving voltage signal, which improves the reliability and practicability of the AC-DC switching lighting driving circuit.
  • the AC-DC switching lighting driving circuit further includes: a voltage dividing power supply circuit 17 .
  • the voltage dividing power supply circuit 17 is connected to the rectifier circuit 11 , the transformer power conversion circuit 12 and the power control circuit 15 , and is configured to generate a first power supply voltage according to the rectified voltage signal and the auxiliary power supply voltage to supply power to the power control circuit 15 .
  • the voltage dividing power supply circuit 17 divides the rectified voltage signal and the auxiliary power supply voltage to generate a first power supply voltage, and uses the first power supply voltage to supply power to the power control circuit 15 to support the normal operation of the power control circuit 15, and No additional power supply circuit is required to provide the operating voltage required by the power control circuit 15 .
  • the operating voltage required by the power control circuit 15 can also be obtained from a battery power source or a power adapter or a voltage conversion chip circuit, so that the power control circuit 15 can generate a drive control signal according to the power adjustment enable signal to drive
  • the transformer power conversion circuit 12 adjusts the power corresponding to the driving voltage signal output to the load 100, so as to reduce the power consumption of the emergency lighting DC power supply, prolong the service life of the lighting emergency power supply, and at the same time ensure compliance with the emergency lighting system design specifications.
  • the AC-DC switching lighting driving circuit further includes: a protection circuit 18 .
  • the protection circuit 18 is connected to the input power supply circuit 01 and the rectification circuit 11, and is configured to perform overcurrent protection and overtemperature protection for the power supply voltage signal.
  • the protection circuit 18 includes protection components, such as fuses, etc., which can disconnect the connection between the input power circuit 01 and the subsequent circuit when the current of the input AC power voltage signal is too large, and protect the latter circuit and The lighting load is not protected from overcurrent, overtemperature and overvoltage, meets safety standards, and improves the safety and reliability of the AC-DC switching lighting drive circuit.
  • protection components such as fuses, etc.
  • the AC-DC switching lighting driving circuit further includes: an electromagnetic filter circuit 19 , a first filter circuit 20 and a second filter circuit 21 .
  • the electromagnetic filter circuit 19 is connected to the protection circuit 18 and the rectifier circuit 11, and is configured to perform electromagnetic interference suppression processing on the power supply voltage signal after overcurrent protection and overtemperature protection.
  • the first filter circuit 20 is connected to the rectifier circuit 11 and the voltage sampling circuit 13, and is configured to perform filtering and noise reduction processing on the rectified voltage signal;
  • the electromagnetic filter circuit 19 can suppress the electromagnetic interference in the circuit, for example, the differential mode noise/interference generated in the circuit when the input power circuit 01 provides the AC voltage signal, and can suppress the power grid surge, so as to protect the Components in the circuit are protected from inrush current damage.
  • the first filter circuit 20 can perform filtering and noise reduction processing on the rectified voltage signal, so as to output a stable and low-noise rectified voltage signal to the voltage sampling circuit 13 and the transformer power conversion circuit 12, thereby improving the voltage sampling accuracy of the voltage sampling circuit 13. , and also improve the precision and stability reliability of the voltage conversion and other processing performed by the transformer power conversion circuit 12 on the rectified voltage signal.
  • the second filter circuit 21 performs filtering and noise reduction processing on the driving voltage signal, so as to output the driving voltage signal with low noise interference to the load 100 , so as to drive the load 100 to work stably.
  • the embodiments of the present application effectively improve the driving stability, reliability and safety of the AC-DC switching lighting driving circuit.
  • the electromagnetic filter circuit includes: a first inductor L1, a thirteenth resistor R13, a fourteenth resistor R14, a second inductor L2, a first variable resistor VR1, and a first Filter capacitor CX1;
  • the first end of the first inductor L1, the first end of the thirteenth resistor R13, and the first end of the first filter capacitor CX1 are commonly connected to the input power circuit 01, and the first inductor L1
  • the second end of the thirteenth resistor R13, the first end of the first variable resistor VR1 are connected to the rectifier circuit 11 in common, and the second end of the first filter capacitor CX1 , the first end of the fourteenth resistor R14 and the first end of the second inductor L2 are connected to the input power circuit 01 in common, the second end of the second inductor L2, the fourteenth resistor
  • the second end of R14 and the second end of the first variable resistor VR1 are commonly connected to the rectifier circuit 11 .
  • the first filter circuit 20 includes a second filter capacitor CX2 ; the first end of the second filter capacitor CX2 is connected to the first output end of the rectifier circuit 11 , the second end of the second filter capacitor CX2 is connected to the second output end of the rectifier circuit 11 .
  • the second filter circuit 21 includes a third filter capacitor CX3 and a seventeenth resistor R17 ; the first end of the third filter capacitor CX3 is connected to the seventeenth resistor R17 .
  • the first end of the resistor R17 is commonly connected to the first end of the load 100
  • the second end of the third filter capacitor CX3 and the second end of the seventeenth resistor R17 are commonly connected to the first end of the load 100 . two ends.
  • the rectifier circuit 11 includes a rectifier bridge DB1; the first input end of the rectifier bridge DB1 is connected to the first output end of the input power supply circuit 01, and the rectifier The second input end of the bridge DB1 is connected to the second output end of the input power supply circuit 01 , the first output end of the rectifier circuit 11 is connected to the first end of the load 100 , and the second end of the rectifier circuit 11 is connected to the first end of the load 100 .
  • the output terminal is grounded.
  • the protection circuit 18 includes a fuse F1; the first end of the fuse F1 is connected to the input power circuit 01, and the second end of the fuse F1 is connected to the The rectifier circuit 11 is connected.
  • the rectifier circuit 11 includes a rectifier bridge DB1.
  • the input power supply circuit 01 When the input power supply circuit 01 is connected to an AC power supply voltage signal, it can convert a 50Hz sine wave AC power into a unidirectional pulsating DC voltage/current with a frequency of 100Hz. , and the voltage range obtained after rectifying AC 198-264V is 279-373.4V; at the same time, when the input power circuit 01 is connected to the DC power supply voltage signal provided by the lighting emergency DC power supply, such as DC 198-264V, it can The power supply voltage signal is subjected to rectification processing such as anti-reverse connection to generate a rectified voltage signal.
  • the voltage sampling circuit 13 includes: a first diode D1, a second diode D2, a first capacitor C1, a first resistor R1, and a second resistor R2;
  • the anode of a diode D1 is connected to the rectifier circuit 11, the cathode of the first diode D1 is connected to the first end of the first resistor R1 and the first end of the first capacitor C1, and the second end of the first capacitor C1 is connected to the first end of the first resistor R1 and the first end of the first capacitor C1.
  • the power supply is connected to ground, the second end of the first resistor R1 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is connected to the anode of the second diode D2, and the cathode of the second diode D2 Connected to the comparison circuit 14 .
  • the anode of the first diode D1 is connected to the positive output end of the rectifier circuit 11
  • the voltage sampling circuit 13 is a high-voltage sampling circuit, and is a rectified voltage signal after filtering and noise reduction processing by the first filter circuit 20 .
  • the first diode D1 and the first capacitor C1 stabilize and filter the rectified voltage signal, so that the pulsating DC is more stable, thereby improving the detection and sampling of the rectified voltage signal by the voltage sampling circuit 13 accuracy and stable reliability.
  • the comparison circuit 14 includes: a first comparator U3, a first field effect transistor Q4, a second capacitor C2, a third resistor R3, a third diode D3, and a fourth second pole tube D4; wherein, the non-inverting input terminal + of the first comparator U3 is connected to the reference voltage signal terminal, and the inverting input terminal - of the first comparator U3 is connected to the voltage sampling circuit 13, the first terminal of the third resistor R3 and the first terminal of the third resistor R3.
  • the first terminal of the two capacitors C2 is connected, the power terminal VCC of the first comparator U3 is connected to the second power supply voltage terminal, the output terminal O of the first comparator U3 is connected to the gate of the first field effect transistor Q4, the first field The drain of the effect transistor Q4 is connected to the power control circuit 15, the source of the first field effect transistor Q4 is connected to the anode of the third diode D3, and the cathode of the third diode D3 is connected to the anode of the fourth diode D4 Connection, the second end of the third resistor R3, the second end of the second capacitor C2 and the cathode of the fourth diode D4 are connected to the power supply ground.
  • the reference voltage signal terminal provides the reference voltage signal
  • the second power supply voltage terminal provides the second power supply voltage.
  • the power supply terminal VCC of the first comparator U3 is also connected to the reference voltage generating circuit 16, and the reference voltage generating circuit 16 generates a second power supply voltage according to the auxiliary power supply voltage, so as to provide a reference for the first comparator.
  • U3 supplies power, avoids setting up a power supply circuit to supply power to the reference voltage generating circuit 16, the circuit structure is simple, and the cost is saved.
  • the inverting input terminal of the first comparator U3 is connected to the cathode of the second diode D2 to receive the voltage sampling signal output from the voltage sampling circuit 13 from the cathode of the second diode D2, and is passed through the second capacitor C2 and
  • the RC filter circuit formed by the third resistor R3 performs filtering and noise reduction processing on the voltage sampling signal, so as to improve the accuracy of the first comparator U3 generating the power adjustment enable signal according to the voltage comparison signal and the reference voltage signal.
  • the voltage value of the power adjustment enable signal is the sum of the resulting voltage values of the third diode D3 and the fourth diode D4.
  • the reference voltage generating circuit 16 includes an eighth diode D8, a seventeenth resistor R17, an eighteenth resistor R18, a first voltage regulator chip U2 and a ninth capacitor C9; wherein , the anode of the eighth diode D8 is connected to the transformer power conversion circuit 12, the cathode of the eighth diode D8 is connected to the first end of the seventeenth resistor R17, and the second end of the seventeenth resistor R17 is connected to the comparison circuit 14.
  • the first end of the eighteenth resistor R18 is connected to the first end of the ninth capacitor C9, the second end of the ninth capacitor C9 is connected to the power supply ground, the second end of the eighteenth resistor R18, the first voltage regulator chip
  • the cathode of U2 and the reference terminal of the first voltage regulator chip U2 are connected to the comparison circuit 14 in common, and the anode of the first voltage regulator chip U2 is connected to the power ground.
  • the cathode of the first voltage regulator chip U2 is the reference voltage output terminal of the reference voltage generating circuit 16, and outputs the reference voltage signal to the non-inverting input terminal + of the first comparator U3.
  • the second terminal of the seventeenth resistor R17 outputs the second power supply voltage to the power terminal VCC of the first comparator U3 to supply power to the first comparator U3.
  • the power control circuit 15 includes: a power control chip U1 , a third capacitor C3 , a fourth capacitor C4 , a fifth capacitor C5 , a sixth capacitor C6 , a seventh capacitor C7 , and a fifth capacitor C7 .
  • the compensation terminal COMP of the power control chip U1 Connect to the first end of the fourth resistor R4 and the first end of the third capacitor C3, the second end of the fourth resistor R4 is connected to the first end of the fourth capacitor C4, the second end of the third capacitor C3 and the fourth The second end of the capacitor C4 is connected to the power ground, and the voltage divider network end ZCS of the power control chip U1 is connected to the first end of the fifth capacitor C5, the second end of the fifth resistor R5 and the first end of the sixth resistor R6, The first end of the fifth resistor R5 is connected to the transformer power conversion circuit 12, the second end of the sixth resistor R6 and the second end of the fifth capacitor C5 are connected to the power supply ground, and the current sensing end ISEN of the power control chip U1 is connected to the power supply ground.
  • the first end of the seventh resistor R7 is connected, the ground end GND of the power control chip U1 is connected to the power supply ground, the analog dimming end ADIM of the power control chip U1 is connected to the first end of the seventh capacitor C7 and the comparison circuit 14, the seventh The second end of the capacitor C7 is connected to the power supply ground, the input voltage terminal VIN of the power control chip U1 is connected to the first end of the sixth capacitor C6 and the voltage dividing power supply circuit 17, and the second end of the sixth capacitor C6 is connected to the power supply ground,
  • the driving terminal DRV of the power control chip U1 is connected to the first terminal of the eighth resistor R8 and the cathode of the fifth diode D5, the second terminal of the eighth resistor R8, the anode of the fifth diode D5 and the ninth resistor R9
  • the first end of the resistor R10 is connected to the transformer power conversion circuit 12 in common, the second end of the ninth resistor R9, the second end of the seventh resistor R7 and the first end
  • the third capacitor C3, the fourth capacitor C4 and the fourth resistor R4 together constitute the RC filter circuit of the power control chip U1, which is the compensation network of the power control chip U1, which can make the power control chip U1 work stably and reliably .
  • the first end of the fifth resistor R5 is connected to the transformer power conversion circuit 12 to access the auxiliary power supply voltage output by the transformer power patent circuit 12, so as to detect that the transformer power conversion circuit 12 performs voltage conversion processing on the rectified voltage signal to The condition of generating the drive voltage signal and the auxiliary supply voltage forms a feedback detection that adjusts the power of the drive voltage signal.
  • the eighth resistor R8 and the fifth diode D5 can perform current limiting protection and anti-reverse connection protection on the driving control signal, so as to protect components such as the power control chip U1 from overcurrent damage.
  • the analog dimming terminal ADIM of the power control chip U1 inputs the power adjustment enable signal, and the seventh capacitor C7 filters the power adjustment enable signal.
  • the power adjustment enable signal input to the analog dimming terminal ADIM of the power control chip U1
  • the voltage value range is 0-3.3V.
  • the adjustment driving voltage signal is full load power (that is, rated power)
  • the voltage value of the power adjustment enable signal input by the analog dimming terminal ADIM of the power control chip U1 is 3.3V, and the power Please refer to Figure 7 for the dimming curve of the control chip U1.
  • Figure 7 shows the relationship between the voltage value of the power adjustment enable signal input by the analog dimming terminal ADIM of the power control chip U1 and the percentage of the power that adjusts the driving voltage signal.
  • 3.3V is the voltage value of the power adjustment enable signal corresponding to the full load power
  • 3.3V*20% 0.66V, which is exactly two diodes connected in series (ie the third diode D3 and the fourth diode D4)
  • the voltage dividing power supply circuit 17 generates a first power supply voltage to supply power to the power control chip U1.
  • the voltage dividing power supply circuit 17 includes a fifteenth resistor R15, a sixteenth resistor R16 and a seventh diode D7; the first end of the fifteenth resistor R15 is connected to the rectifier circuit , the second end of the fifteenth resistor R15 and the first end of the sixteenth resistor R16 are connected to the power control circuit 15 in common, the second end of the sixteenth resistor R16 is connected to the cathode of the seventh diode D7, the seventh The anode of the diode D7 is connected to the reference voltage generating circuit.
  • the rectified voltage signal is divided by the fifteenth resistor R15, and the auxiliary power supply voltage is divided by the sixteenth resistor R16 and the seventh diode D7, so as to obtain the second power supply voltage, which is passed through
  • the sixth capacitor C6 performs filtering and noise reduction processing on the first power supply voltage, and outputs it to the input voltage terminal VIN of the power control chip U1 to supply power to the power control chip U1.
  • the variable voltage power conversion circuit 12 includes: a transformer T1, an eighth capacitor C8, a sixth diode D6, an eleventh resistor R11, a twelfth resistor R12, and a second field Effect transistor Q2; wherein, the first end of the primary winding T1-A of the transformer T1 is connected to the rectifier circuit 11 and the load 100, and the second end of the primary winding T1-A of the transformer T1 is connected to the first end of the eighth capacitor C8 , the anode of the sixth diode D6 and the drain of the second field effect transistor Q2 are connected, the source of the second field effect transistor Q2, the gate of the second field effect transistor Q2 and the first end of the twelfth resistor R12 Commonly connected to the power control circuit 15, the second end of the twelfth resistor R12 is connected to the power supply ground, the second end of the eighth capacitor C8 is connected to the first end of the eleventh resistor R11, and the cathode of
  • the first end of the secondary winding T1 -AB of the transformer T1 is also connected to the reference voltage generating circuit 16 , so as to output the auxiliary power supply voltage to the reference voltage generating circuit 16 .
  • the gate of the second field effect transistor Q2 is the driving control signal input end of the patented circuit 12 of the transformer power.
  • the second end of the eighth resistor R8, the anode of the fifth diode D5 and the first end of the ninth resistor R9 are connected to the gate of the second field effect transistor Q2, and the power control chip U1 adjusts the output to the second field effect transistor
  • the duty ratio of the drive control signal of the gate of the transistor Q2 is adjusted, so as to adjust the drive voltage signal output to the load LED, thereby realizing the adjustment of the power corresponding to the drive voltage signal.
  • the power supply voltage signal (ie DC 198-264V), so that the voltage sampling signal generated after sampling the rectified voltage signal by the voltage sampling circuit 13 is higher than the reference voltage 2.5V (ie the reference voltage signal), that is, the first comparator U3
  • the voltage of the inverting input terminal - of the first comparator U3 is higher than the non-inverting input terminal of the first comparator U3 + the corresponding reference voltage of 2.5V, the first comparator U3 outputs a low level to control the first field effect transistor Q4 to be turned off, and the power control chip U1
  • the analog dimming terminal ADIM is high level, and the power control chip U1 is not enabled to generate the drive control signal; when the input power circuit 01 is switched to connect to the DC power supply voltage signal (ie DC 198-264V) provided by the lighting emergency system,
  • the voltage sampling circuit 13 samples the rectified voltage signal and generates a voltage sampling signal low-voltage reference voltage signal, the voltage of the inverting input terminal - of the first comparator U3 is
  • the power adjustment enable signal with a voltage value of 0.6-0.7V is exactly 20% of the full load power, using two diodes (ie the third diode D3 and The fourth diode D4) is connected in series to realize the function of low-cost automatic conversion of emergency DC power supply and reducing the working power of the load 100 when the emergency DC power supply is supplied, and also conforms to the emergency lighting system design specification standard.
  • a second aspect of the present application provides a lighting fixture comprising the AC-DC switching lighting driving circuit according to any one of the above.
  • the lamps can be LED lamps, including LED lamps, etc., which can be powered by the connected AC mains for full-load lighting, or can be powered by the emergency direct current provided by the connected emergency direct current power supply for lighting. Lighting and lighting, and the power adjustment of the lighting driving voltage signal can be performed when the emergency DC power supply for lighting is connected, thereby saving energy consumption and prolonging the use time of the emergency DC power supply.
  • the embodiment of the present application can realize that when the AC mains is connected, the driving voltage signal of full load power is output to supply power to the load; when the DC power supply voltage provided by the lighting emergency DC power supply is connected, the power corresponding to the output driving voltage signal is adjusted.
  • LED lamps can be used when connected to different power sources; at the same time, when connected to the emergency lighting DC power supply for use, the power of the driving lamps can be adjusted, the lighting power consumption can be reduced, the use time of the emergency DC power supply can be prolonged, and the emergency DC power supply can be used.
  • the lighting system design specification standard saves the cost and improves the practicability of the lighting driving power circuit.

Landscapes

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

Abstract

Sont divulgués un circuit d'attaque d'éclairage à commutation à courant alternatif et à courant continu et une lampe. Le circuit comprend : un circuit de redressement (11) pour effectuer un traitement de redressement sur un signal de tension de source d'alimentation fourni par un circuit de source d'alimentation d'entrée (01), de façon à générer un signal de tension redressé ; un circuit de conversion d'alimentation de transformation (12) pour effectuer un traitement de conversion de tension sur le signal de tension redressé, de façon à générer un signal de tension d'attaque pour entraîner une charge (100) ; un circuit d'échantillonnage de tension (13) pour effectuer un échantillonnage de tension sur le signal de tension redressé, de façon à générer un signal d'échantillonnage de tension ; un circuit de comparaison (14) pour générer un signal d'activation d'ajustement d'alimentation selon le signal d'échantillonnage de tension étant inférieur à un signal de tension de référence ; et un circuit de commande d'alimentation (15) pour générer un signal de commande d'attaque en fonction du signal d'activation d'ajustement d'alimentation, de manière à ajuster le signal de tension d'attaque. Lorsque le circuit d'attaque d'éclairage à commutation de courant alternatif et de courant continu est connecté à une source d'alimentation à courant alternatif, un signal de tension d'attaque ayant une alimentation de pleine charge peut être délivré, et lorsque le circuit d'attaque d'éclairage à commutation de courant alternatif et de courant continu est connecté à une source d'alimentation en courant continu d'urgence, la consommation d'énergie peut être réduite, de telle sorte que le circuit d'attaque d'éclairage à commutation de courant alternatif et de courant continu peut être utilisé lorsqu'il est connecté à différentes sources d'alimentation, ce qui permet de prolonger le temps de service de la source d'alimentation en courant continu d'urgence, et de répondre aux spécifications et aux normes de conception d'un système d'éclairage d'urgence.
PCT/CN2020/127920 2020-10-22 2020-11-10 Circuit d'attaque d'éclairage à commutation à courant alternatif et à courant continu et lampe WO2022082890A1 (fr)

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CN202022375661.6U CN213368188U (zh) 2020-10-22 2020-10-22 一种交直流切换照明驱动电路及灯具
CN202022375661.6 2020-10-22

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CN114221527B (zh) * 2022-02-22 2022-05-20 深圳市深澳视觉科技有限公司 交直流能量转换控制电路及高频医疗设备

Citations (4)

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US20150022922A1 (en) * 2013-07-16 2015-01-22 Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd Power supply circuit for power control chips
CN105392261A (zh) * 2015-12-14 2016-03-09 深圳市明微电子股份有限公司 恒功率线性恒流led驱动电路
CN106162990A (zh) * 2016-07-05 2016-11-23 浙江中睿低碳科技有限公司 Led照明装置及其工作方法
CN211509347U (zh) * 2019-12-04 2020-09-15 深圳市豪恩智能物联股份有限公司 一种色温可调的led应急电源驱动电路及led灯具

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150022922A1 (en) * 2013-07-16 2015-01-22 Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd Power supply circuit for power control chips
CN105392261A (zh) * 2015-12-14 2016-03-09 深圳市明微电子股份有限公司 恒功率线性恒流led驱动电路
CN106162990A (zh) * 2016-07-05 2016-11-23 浙江中睿低碳科技有限公司 Led照明装置及其工作方法
CN211509347U (zh) * 2019-12-04 2020-09-15 深圳市豪恩智能物联股份有限公司 一种色温可调的led应急电源驱动电路及led灯具

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