WO2025001950A1 - 恒流驱动电路、恒流控制系统及灯具 - Google Patents

恒流驱动电路、恒流控制系统及灯具 Download PDF

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Publication number
WO2025001950A1
WO2025001950A1 PCT/CN2024/100278 CN2024100278W WO2025001950A1 WO 2025001950 A1 WO2025001950 A1 WO 2025001950A1 CN 2024100278 W CN2024100278 W CN 2024100278W WO 2025001950 A1 WO2025001950 A1 WO 2025001950A1
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WIPO (PCT)
Prior art keywords
load
resistor
module
output end
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.)
Ceased
Application number
PCT/CN2024/100278
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English (en)
French (fr)
Inventor
孙小兵
陈�峰
韩剑平
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.)
Opple Lighting Co Ltd
Suzhou Op Lighting Co Ltd
Original Assignee
Opple Lighting Co Ltd
Suzhou Op Lighting 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
Priority claimed from CN202321686484.0U external-priority patent/CN220139766U/zh
Priority claimed from CN202310789354.8A external-priority patent/CN119233479A/zh
Application filed by Opple Lighting Co Ltd, Suzhou Op Lighting Co Ltd filed Critical Opple Lighting Co Ltd
Priority to EP24830596.3A priority Critical patent/EP4738999A1/en
Publication of WO2025001950A1 publication Critical patent/WO2025001950A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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]
    • H05B45/30—Driver circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/31—Phase-control circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/345—Current stabilisation; Maintaining constant current

Definitions

  • the present application relates to a constant current drive circuit, a constant current control system and a lamp, and belongs to the technical field of integrated circuits.
  • the purpose of this application is to provide a constant current drive circuit, a constant current control system and a lamp to solve the problem that multi-stage high-voltage linear products in the prior art cannot work when the voltage fluctuates, and cannot meet the phase angle and THD requirements of the new version of the national standard.
  • a constant current driving circuit comprising:
  • a start-stop module connected to the output end of the load module to control the start and stop of the load module
  • An energy storage module connected to the input end of the load module to charge when a high voltage is input to the load module and to discharge when a low voltage is input to the load module;
  • a rectifier module connected to the output end of the energy storage module to control the angle and magnitude of the current flowing through the energy storage module
  • the rectifier module includes a resistor R1, a first compensation circuit, a first reference circuit, a first comparator, a field effect transistor M1 and a resistor R3, the input end of the resistor R1 is connected to the output end of the load module, the output end of the resistor R1 is connected to the input end of the first compensation circuit, the output end of the first compensation circuit is connected to the input end of the first reference circuit, the output end of the first reference circuit is connected to the non-inverting input end of the first comparator, the output end of the first comparator is connected to the gate of the field effect transistor M1, the drain of the field effect transistor M1 is connected to the energy storage module, the source of the field effect transistor M1 is respectively connected to the reverse input end of the first comparator and the input end of the resistor R3, the output end of the resistor R3 is connected to the output end of the load module and is grounded, so as to control the load through the resistor R3.
  • the current peak value of the energy storage module is controlled.
  • the energy storage module includes an electrolytic capacitor E1 and a resistor R4 connected in parallel with the electrolytic capacitor E1, the positive electrode of the electrolytic capacitor E1 is connected to the input end of the load module, and the negative electrode of the electrolytic capacitor E1 is connected to the drain of the field effect transistor M1.
  • the resistance value of the resistor R1 is adjusted to control the connection or disconnection of the field effect transistor M1 to change the current angle of the electrolytic capacitor E1 during charging and discharging.
  • the rectifier module also includes a temperature protector connected to the first reference circuit.
  • the load module includes a first load, a second load and a resistor connected in series, the input end of the energy storage module is connected to the input end of the first load, the resistor R1 is connected to the output end of the second load, the input end of the resistor is respectively connected to the output ends of the first load and the second load, and the output end of the resistor is grounded.
  • the start-stop module includes a resistor R2, a filter capacitor C1, a second compensation circuit, a second reference circuit, a second switch circuit and a third switch circuit
  • the input end of the resistor R2 is connected to the input end of the load module
  • the output end of the resistor R2 is respectively connected to the input end of the filter capacitor C1 and the second compensation circuit
  • the output end of the filter capacitor C1 is grounded
  • the second compensation circuit is connected to the second reference circuit
  • the input end of the second switch circuit is connected to the output end of the first load
  • the output end of the second switch circuit is connected to the resistor to control the start or stop of the first load
  • the input end of the third switch circuit is connected to the output end of the second load
  • the output end of the third switch circuit is connected to the resistor to control the start or stop of the second load
  • the second reference circuit generates a reference voltage and inputs it into the second switch circuit and the third switch circuit to control the start or stop of the first load and the second load respectively.
  • the second switching circuit includes a second comparator and a field effect transistor M2, the second reference circuit is connected to the positive phase input terminal of the second comparator, the source of the field effect transistor M2 is respectively connected to the resistor and the negative phase input terminal of the second comparator, the drain of the field effect transistor M2 is connected to the output terminal of the first load, and the second comparator controls the connection or disconnection of the field effect transistor M2 to control the start or stop of the first load.
  • the third switching circuit includes a third comparator and a field effect transistor M3, the second reference circuit is connected to the positive phase input terminal of the third comparator, the source of the field effect transistor M3 is respectively connected to the resistor and the negative phase input terminal of the third comparator, the drain of the field effect transistor M3 is connected to the output terminal of the second load, and the third comparator controls the connection or disconnection of the field effect transistor M3 to control the start or stop of the second load.
  • the present application provides a constant current control system, including a drive module, a chip and the aforementioned constant current drive circuit, the resistor R1 is connected to the pin VT1 of the chip, the resistor R3 is connected to the pin CS of the chip, one end of the energy storage module is connected to the output end of the drive module, and the other end is connected to the pin CH of the chip, the load module includes a first load, a second load and a resistor, the input end of the first load is connected to the drive module, the output end of the first load is respectively connected to the input end of the second load and the pin OUT1 of the chip, the output end of the second load is connected to the pin OUT2 of the chip, the resistor is connected to the pin REXT of the chip, the start-stop module includes a resistor R2, the input end of the resistor R2 is connected to the output end of the drive module, and the output end of the resistor R2 is respectively connected to the filter capacitor C1 and the pin
  • the driving module includes a rectifier bridge and a diode D1 connected to the wire network, the output end of the rectifier bridge is connected to the output end of the diode D1, and the output end of the diode D1 is respectively connected to the resistor R2, the energy storage module and the load module.
  • the present application provides a lamp, which uses the above-mentioned constant current drive circuit, wherein the load module is an LED lamp.
  • the constant current drive circuit of the present application adjusts the current peak value and current phase angle of the electrolytic capacitor E1 during the charging or discharging process through the rectifier module, so that the output current of the constant current drive circuit can meet the requirements of the phase angle and THD in the new version of the national standard; by adjusting the resistance value of the resistor R1, the connection or disconnection time of the field effect tube M1 is changed, thereby adjusting the phase angle of the electrolytic capacitor E1; by adjusting the resistance value of the resistor R3, the current peak value of the electrolytic capacitor E1 is adjusted.
  • FIG. 1 is a circuit diagram of a drive control system according to a preferred embodiment of the present application.
  • FIG. 2 is an internal circuit diagram of the chip in FIG. 1 .
  • Constant current control system 100 constant current drive circuit 200, load module 1, first load 11, second load 12, resistor 13, energy storage module 2, electrolytic capacitor E1, resistor R4, rectifier module 3, resistor R1, first compensation circuit 31, first reference circuit 32, first comparator 33, field effect tube M1, resistor R3, first power supply circuit 34, first protector 35, start-stop module 4, resistor R2, filter capacitor C1, second compensation circuit 41, second reference circuit 42, second switch circuit 43, field effect tube M2, second comparator 431, third switch circuit 44, third comparator 441, field effect tube M3, second protector 45, second power supply circuit 46, drive module 5, rectifier bridge 51, diode D1, chip 6.
  • the present application discloses a constant current drive circuit 200 for adjusting the phase angle and peak value of the circuit output current, so that the constant current drive circuit 200 can meet the new version of the national standard, thereby enabling products using the circuit to be successfully launched on the market and meet the consumption needs of consumers.
  • the constant current drive circuit 200 includes a load module 1, a start-stop module 4, an energy storage module 2 and a rectifier module 3, wherein the start-stop module 4 is connected to the output end of the load module 1 to control the start and stop of the load module 1; the energy storage module 2 is connected to the input end of the load module 1 to charge when a high voltage is input to the load module 1, and to discharge when a low voltage is input to the load module 1, so as to maintain the normal operation of the circuit load module 1 and improve the stability of the product operation; the rectifier module 3 is connected to the output end of the energy storage module 2 to control the current angle and current peak value flowing through the energy storage module 2.
  • the rectifier module 3 includes a resistor R1, a first compensation circuit 31, a first reference circuit 32, a first comparator 33, a field effect transistor M1 and a resistor R3.
  • the input end of the resistor R1 is connected to the output end of the load module 1
  • the output end of the resistor R1 is connected to the input end of the first compensation circuit 31
  • the output end of the first compensation circuit 31 is connected to the output end of the first reference circuit 32.
  • the input end is connected, the output end of the first reference circuit 32 is connected to the non-inverting input end of the first comparator 33, the output end of the first comparator 33 is connected to the gate of the field effect tube M1, the drain of the field effect tube M1 is connected to the energy storage module 2, the source of the field effect tube M1 is respectively connected to the reverse input end of the first comparator 33 and the input end of the resistor R3, the output end of the resistor R3 is connected to the output end of the load module 1 and is grounded, so as to control the current peak of the energy storage module 2 through the resistor R3.
  • the rectifier module 3 can detect the voltage of the load module 1 through the voltage difference across the resistor R1.
  • the first compensation circuit 31 controls the first reference circuit 32 to generate different reference voltages, which are compared through the first comparator 33, thereby controlling the connection and disconnection of the field effect tube M1, thereby controlling the current angle of the energy storage module 2.
  • the resistance value of the resistor R1 is adjusted to change the voltage difference across the resistor R1, thereby changing the reference voltage of the first reference circuit 32 to adjust the current angle.
  • the resistor R3 is connected in series with the energy storage module 2 .
  • the maximum current flowing through the resistor R3 that is, the peak value of the current, can be adjusted, thereby adjusting the peak current of the energy storage module 2 .
  • the energy storage module 2 includes an electrolytic capacitor E1 and a resistor R4 connected in parallel with the electrolytic capacitor E1.
  • the positive electrode of the electrolytic capacitor E1 is connected to the input end of the load module 1, and the negative electrode of the electrolytic capacitor E1 is connected to the drain of the field effect transistor M1.
  • the resistance value of the resistor R1 is adjusted to control the connection or disconnection of the field effect transistor M1 to change the current angle when the electrolytic capacitor E1 is charged and discharged.
  • the rectifier module 3 also includes a temperature protector connected to the first reference circuit 32.
  • the temperature protector can detect the operating temperature of the constant current drive circuit 200. When the temperature is high, it can control the first reference circuit 32, and then control the output power of the constant current drive circuit 200, so that the output power is reduced to achieve cooling of the constant current drive circuit 200, thereby protecting the constant current drive circuit 200 and preventing abnormalities in the constant current drive circuit 200 caused by high temperature.
  • the load module 1 includes a first load 11, a second load 12 and a resistor 13 connected in series, the input end of the energy storage module 2 is connected to the input end of the first load 11, the resistor R1 is connected to the output end of the second load 12, the input end of the resistor 13 is connected to the output ends of the first load 11 and the second load 12 respectively, and the output end of the resistor 13 is grounded.
  • the energy storage module 2 can supply power to the load module 1 when the voltage of the load module 1 is low, so as to maintain the normal operation of the load module 1.
  • the resistor 13 the current of the load module 1 can be controlled.
  • the resistor 13 is provided with two resistors arranged in parallel, which are defined as resistor R5A and resistor R5B respectively, so as to control the heat generated by the resistor 13.
  • the resistor 13 can be set to one, three, five, etc. arranged in parallel, as long as the heat generated by the resistor 13 can be controlled and the resistor 13 can work normally, and there is no limitation here.
  • the start-stop module 4 includes a resistor R2, a filter capacitor C1, a second compensation circuit 41, a second reference circuit 42, a second switch circuit 43 and a third switch circuit 44, the input end of the resistor R2 is connected to the input end of the load module 1, the output end of the resistor R2 is respectively connected to the filter capacitor C1 and the input end of the second compensation circuit 41, the output end of the filter capacitor C1 is grounded, the second compensation circuit 41 is connected to the second reference circuit 42, the input end of the second switch circuit 43 is connected to the output end of the first load 11, the output end of the second switch circuit 43 is connected to the resistor 13 to control the start or stop of the first load 11, the input end of the third switch circuit 44 is connected to the output end of the second load 12, and the output end of the third switch circuit 44 is connected to the resistor 13
  • the second reference circuit 42 generates a reference voltage and inputs it into the second switch circuit 43 and the third switch circuit 44 to control the start or stop of the first load 11 and the second load 12 respectively.
  • the filter capacitor C1 By setting a filter capacitor C1 at the output end of the resistor R2, the filter capacitor C1 can be charged and discharged when the constant current drive circuit 200 is working, and the reference voltage generated by the second reference circuit 42 is adjusted, thereby controlling the first switch circuit and the second switch circuit 43 to start or stop the second load 12.
  • the second switch circuit 43 includes a second comparator 431 and a field effect transistor M2, the second reference circuit 42 is connected to the positive phase input terminal of the second comparator 431, the source of the field effect transistor M2 is connected to the resistor 13 and the negative phase input terminal of the second comparator 431 respectively, the drain of the field effect transistor M2 is connected to the output terminal of the first load 11, and the second comparator 431 controls the connection or disconnection of the field effect transistor M2 to control the start or stop of the first load 11.
  • the second comparator 431 can generate a comparator reference, and compare the reference with the reference voltage generated by the second reference circuit 42 to determine whether the field effect transistor M2 needs to be turned on or off to start or stop the first load 11.
  • the third switch circuit 44 includes a third comparator 441 and a field effect transistor M3, the second reference circuit 42 is connected to the positive phase input terminal of the third comparator 441, the source of the field effect transistor M3 is connected to the resistor 13 and the negative phase input terminal of the third comparator 441 respectively, the drain of the field effect transistor M3 is connected to the output terminal of the second load 12, and the third comparator 441 controls the connection or disconnection of the field effect transistor M3 to control the start or stop of the second load 12.
  • the third comparator 441 can generate a comparator reference, and compare the reference with the reference voltage generated by the second reference circuit 42 to determine whether it is necessary to turn on or off the field effect transistor M3 to start or stop the second load 12.
  • the reference of the second comparator 431 is lower than the reference of the third comparator 441, so that the reference voltage generated by the second reference circuit 42 can control only the field effect transistor M2 to be connected, or both the field effect transistor M2 and the field effect transistor M3 to be connected through the second comparator 431 and the third comparator 441.
  • the second load 12 is connected to divide the voltage of the first load 11 and avoid the first load 11 from breaking down due to excessive voltage.
  • the constant current drive circuit 200 may also include a drive module 5 to supply power to the load module 1 to drive the load module 1 to work.
  • the drive module 5 includes a rectifier bridge 51 and a diode D1 connected to the line network.
  • the output end of the rectifier bridge 51 is connected to the output end of the diode D1, and the output end of the diode D1 is respectively connected to the resistor R2, the energy storage module 2 and the load module 1.
  • the specific circuit structures of the first compensation circuit 31, the first reference circuit 32, the first protector 35, the second compensation circuit 41, the second reference circuit 42 and the second protector 45 can be set according to the existing technology and are not limited here.
  • the technical solution of the present application includes four circuits, namely, a charging circuit of the electrolytic capacitor E1, a discharging circuit of the electrolytic capacitor E1, a working circuit of the first load 11, and a working circuit of the first load 11 and the second load 12.
  • a charging circuit of the electrolytic capacitor E1 When the voltage of the rectifier bridge 51 is high, the working circuits of the first load 11 and the second load 12 are connected to the charging circuit of the electrolytic capacitor E1; when the voltage of the rectifier bridge 51 is close to the working voltage of the first load 11, the working circuit of the first load 11 is connected; when the voltage of the rectifier bridge 51 is low, the discharge circuit of the electrolytic capacitor E1 is connected.
  • the current is output from the rectifier bridge 51 and flows to the electrolytic capacitor E1, the first load 11 and the second load 12 respectively after passing through the diode D1, and can flow to the resistor R1 after flowing through the second load 12.
  • This causes a voltage difference to appear on the resistor R1, and the connection or disconnection of the field effect tube M1 is controlled by the first compensation circuit 31, the first reference circuit 32 and the first comparator 33.
  • the negative electrode of the electrolytic capacitor E1 is connected to the ground through the field effect tube M1 and the resistor R3, so that the electrolytic capacitor E1 can form a complete loop, thereby realizing the charging of the electrolytic capacitor E1.
  • the current is output from the positive electrode of the electrolytic capacitor E1, passes through the first load 11 and/or the second load 12, and then passes through the resistor 13, the resistor R3 and flows to the negative electrode of the electrolytic capacitor E1 through the field effect transistor M1 to form a power supply circuit from the electrolytic capacitor E1 to the first load 11 and/or the second load 12, so that when the voltage of the rectifier bridge 51 is low, the load module 1 is powered by the electrolytic capacitor E1 to maintain the normal operation of the load module 1.
  • the current output by the rectifier bridge 51 flows to the resistor R2 and the first load 11 respectively, and the current is output to the second compensation circuit 41 and the second reference circuit 42 after passing through the resistor R2.
  • the second reference circuit 42 controls the second switch circuit 43 to be connected.
  • the third switch circuit 44 is disconnected, so that the first load 11 is connected and the second load 12 is turned off.
  • the current flowing through the first load 11 flows through the field effect transistor M2 and then is grounded through the resistor 13 to form the working loop of the first load 11.
  • the second reference circuit 42 controls the second switch circuit 43 and the third switch circuit 44 to be connected, so that the first load 11 and the second load 12 are both connected, and the current flows through the first load 11, the second load 12 and the resistor 13 and then is grounded to form the working loop of the first load 11 and the second load 12.
  • the present application also provides a constant current control system 100, including a driving module 5, a chip 6 and the aforementioned constant current driving circuit 200, and some components in the constant current control circuit are integrated into the chip 6, thereby improving the integration of the constant current control system 100 and reducing the production cost of the constant current control system 100.
  • the resistor R1 is connected to the pin VT1 of the chip 6, the resistor R3 is connected to the pin CS of the chip 6, one end of the energy storage module 2 is connected to the output end of the driving module 5, and the other end is connected to the pin CH of the chip 6.
  • the first compensation circuit 31, the first reference circuit 32, the first comparator 33 and the field effect transistor M1 in the rectifier module 3 are all integrated in the chip 6, one end of the first compensation circuit 31 is connected to the pin VT1 of the chip 6, and the other end is connected to the first reference circuit 32, the first reference circuit 32 is connected to the positive phase input of the first comparator 33, the first comparator 33 is connected to the gate of the field effect transistor M1, the source of the field effect transistor M1 is connected to the negative phase input of the first comparator 33 and the pin CS of the chip 6, and the drain of the field effect transistor M1 is connected to the pin CH of the chip 6.
  • the rectifier module 3 also includes a first power supply circuit 34 and a first protector 35 provided in the chip 6, wherein one end of the first power supply circuit 34 is connected to the CH pin of the chip 6, and the other end is connected to the chip 6 to supply power to the chip 6.
  • the first protector 35 is a temperature protector, which is provided inside the chip 6 and connected to the first reference circuit 32 to prevent the chip 6 from being damaged due to excessive temperature.
  • a GND terminal is provided in the chip 6, and the resistor R3 is connected to the pin CS and the GND terminal of the chip 6 to realize the grounding of the resistor R3.
  • the load module 1 includes a first load 11, a second load 12 and a resistor 13.
  • the input end of the first load 11 is connected to the driving module 5, the output end of the first load 11 is respectively connected to the input end of the second load 12 and the pin OUT1 of the chip 6, the output end of the second load 12 is connected to the pin OUT2 of the chip 6, the resistor 13 is connected to the pin REXT of the chip 6, the start-stop module 4 includes a resistor R2, the input end of the resistor R2 is connected to the output end of the driving module 5, and the output end of the resistor R2 is connected to the output end of the driving module 5. They are respectively connected to the filter capacitor C1 and the pin VT2 of the chip 6.
  • the second compensation circuit 41, the second reference circuit 42 and the second switch circuit 43 in the start-stop module 4 are all integrated in the chip 6.
  • One end of the second compensation circuit 41 is connected to the pin VT2 of the chip 6, and the other end is connected to the second reference circuit 42.
  • the second reference circuit 42 is respectively connected to the positive phase inputs of the second comparator 431 and the third comparator 441.
  • the second comparator 431 is connected to the gate of the field effect transistor M2, the source of the field effect transistor M2 is connected to the negative phase input of the second comparator 431 and the pin REXT of the chip 6, and the drain of the field effect transistor M2 is connected to the pin OUT1 of the chip 6;
  • the third comparator 441 is connected to the gate of the field effect transistor M3, the source of the field effect transistor M3 is connected to the negative phase input of the second comparator 431 and the pin REXT of the chip 6, and the drain of the field effect transistor M3 is connected to the pin OUT2 of the chip 6.
  • the start-stop module 4 further includes a second power supply circuit 46 and a second protector 45 disposed in the chip 6, wherein one end of the second power supply circuit 46 is connected to the pin OUT1 of the chip 6, and the other end is connected to the chip 6 to supply power to the chip 6.
  • the second protector 45 is a temperature protector, which is disposed inside the chip 6 and connected to the second reference circuit 42 to prevent the chip 6 from being damaged due to excessive temperature.
  • the driving module 5 includes a rectifier bridge 51 and a diode D1 connected to the wire network, the output end of the rectifier bridge 51 is connected to the output end of the diode D1, and the output end of the diode D1 is respectively connected to the resistor R2, the energy storage module 2 and the load module 1.
  • the current of the rectifier bridge 51 can flow through the diode D1 and then flow to the energy storage module 2 and the load module 1, and when the energy storage module 2 is discharged, the current cannot flow through the diode D1 to the rectifier bridge 51.
  • the present application also provides a lamp, including a base, a frame, a mask, and a circuit board provided with the aforementioned constant current drive circuit 200, wherein the load module 1 is an LED lamp, the first load 11 is a first light string, the second load 12 is a second light string, and the circuit board is also provided with a drive module 5, which is assembled on the circuit board and connected to an external wire network to convert the alternating current of the wire network into direct current to supply power to the constant current drive circuit 200.
  • the circuit board can be set as a constant current control system 100, and part of the structure in the constant current drive circuit 200 is integrated on the chip 6 to improve the integration of the circuit board, thereby reducing the cost of the circuit board, which is not limited here.
  • the lamps include but are not limited to downlights, bulb lamps, light-emitting modules, ceiling lamps, street lamps, mining lamps, etc.
  • the constant current control system 100 and the constant current drive circuit 200 can also be set in products in other electronic fields, which is not limited here.
  • the constant current drive circuit 200 of the present application adjusts the current peak and current phase angle of the electrolytic capacitor E1 during the charging or discharging process through the rectifier module 3, so that the output current of the constant current drive circuit 200 can meet the requirements of the phase angle and THD in the new version of the national standard; by adjusting the resistance value of the resistor R1, the connection or disconnection time of the field effect tube M1 is changed, and then the phase angle of the electrolytic capacitor E1 is adjusted; by adjusting the resistance value of the resistor R3, the current peak of the electrolytic capacitor E1 is adjusted; by setting the first protector 35 and the second protector 45, the safety of the constant current control system 100 is improved.

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Abstract

本申请提供了一种恒流驱动电路、恒流控制系统及灯具。恒流驱动电路包括负载模块、控制负载模块启动和停止的启停模块、储能模块和控制负载模块电路角度和电流大小的整流模块，储能模块能够在负载模块输入高电压时充电，在负载模块输入低电压时放电，整流模块包括依次连接的电阻R1、第一补偿电路、第一基准电路、第一比较器和场效应管M1，场效应管M1的漏极和源极分别与储能模块和电阻R3连接，电阻R3的输出端与负载模块的输出端连接并接地，通过电阻R3控制储能模块的电流峰值。本申请通过调节电阻R1的阻值，改变场效应管M1的连通或断开时间，以调节电解电容E1的相位角；通过调节电阻R3的阻值，进而调节电解电容E1的电流峰值。

Description

恒流驱动电路、恒流控制系统及灯具
本申请要求了申请日为2023年06月29日，申请号为202310789354.8，发明名称为“恒流驱动电路、恒流控制系统及灯具”以及申请日为2023年06月29日，申请号为202321686484.0，发明名称为“恒流驱动电路、恒流控制系统及灯具”的中国专利申请的优先权，该专利申请的全部内容通过引用结合在本申请中。
技术领域
本申请涉及一种恒流驱动电路、恒流控制系统及灯具，属于集成电路技术领域。
背景技术
随着新板国家标准GB 17625.1-2022《电磁兼容限值-第1部分：谐波电流发射限值(设备每相输入电流≤16A)》的发布，照明设备中大多数涉及多段高压线性的灯具都不符合额定功率≤25W的发射限值，尽管部分产品采用单段的符合标准的高压线性方案进行设计，但是单段的高压线性产品在电压低或电压波动较大时，会出现无法正常工作的情况，同样的，现有多段的高压线性产品也存在电压低或电压波动时出现闪烁或不工作的情况，且现有的多段高压线性产品无法满足新版国家标准对相位角和THD(谐波畸变率)的要求。
有鉴于此，确有必要提出一种恒流驱动电路、恒流控制系统及灯具，以解决上述问题。
发明内容
本申请的目的在于提供一种恒流驱动电路、恒流控制系统及灯具，以解决现有技术中多段高压线性产品在电压波动时会出现无法工作的情况，以及无法满足新版国家标准相位角和THD要求的问题。
为实现上述目的，本申请提供了一种恒流驱动电路，包括：
负载模块；
启停模块，与所述负载模块的输出端连接，以控制所述负载模块的启动和停止；
储能模块，连接于所述负载模块的输入端，以在所述负载模块输入高电压时充电，而在所述负载模块输入低电压时放电；
整流模块，连接于所述储能模块的输出端，以控制流经所述储能模块的电流角度和电流大小；
所述整流模块包括电阻R1、第一补偿电路、第一基准电路、第一比较器、场效应管M1以及电阻R3，所述电阻R1的输入端与所述负载模块的输出端连接，所述电阻R1的输出端与所述第一补偿电路的输入端连接，所述第一补偿电路的输出端与所述第一基准电路的输入端连接，所述第一基准电路的输出端与所述第一比较器的正相输入端连接，所述第一比较器的输出端与所述场效应管M1的栅极连接，所述场效应管M1的漏极与所述储能模块连接，所述场效应管M1的源极分别与所述第一比较器的反向输入端和所述电阻R3的输入端连接，所述电阻R3的输出端与所述负载模块的输出端连接并接地，以通过所述电阻R3控 制所述储能模块的电流峰值。
可选的，所述储能模块包括电解电容E1和与所述电解电容E1并联的电阻R4，所述电解电容E1的正极与所述负载模块的输入端连接，所述电解电容E1的负极与所述场效应管M1的漏极连接，调整所述电阻R1的阻值，以控制所述场效应管M1的连通或断开，以改变所述电解电容E1充放电时的电流角度。
可选的，所述整流模块还包括与所述第一基准电路连接的温度保护器。
可选的，所述负载模块包括串联连接的第一负载、第二负载和电阻，所述储能模块的输入端与所述第一负载的输入端连接，所述电阻R1与所述第二负载的输出端连接，所述电阻的输入端分别与所述第一负载和所述第二负载的输出端连接，所述电阻的输出端接地。
可选的，所述启停模块包括电阻R2、滤波电容C1、第二补偿电路、第二基准电路、第二开关电路和第三开关电路，所述电阻R2的输入端连接所述负载模块的输入端，所述电阻R2的输出端分别与所述滤波电容C1和所述第二补偿电路的输入端连接，所述滤波电容C1的输出端接地，所述第二补偿电路与所述第二基准电路连接，所述第二开关电路的输入端与所述第一负载的输出端连接，所述第二开关电路的输出端与所述电阻连接，以控制所述第一负载的启动或停止，所述第三开关电路的输入端与所述第二负载的输出端连接，所述第三开关电路的输出端与所述电阻连接，以控制所述第二负载的启动或停止，所述第二基准电路产生基准电压，并输入所述第二开关电路和第三开关电路，以分别控制所述第一负载和所述第二负载的启动或停止。
可选的，所述第二开关电路包括第二比较器和场效应管M2，所述第二基准电路与所述第二比较器的正相输入端连接，所述场效应管M2的源极分别与所述电阻和所述第二比较器的负相输入端连接，所述场效应管M2的漏极与所述第一负载的输出端连接，所述第二比较器控制所述场效应管M2的连通或断开，以控制所述第一负载的启动或停止。
可选的，所述第三开关电路包括第三比较器和场效应管M3，所述第二基准电路与所述第三比较器的正相输入端连接，所述场效应管M3的源极分别与所述电阻和所述第三比较器的负相输入端连接，所述场效应管M3的漏极与所述第二负载的输出端连接，所述第三比较器控制所述场效应管M3的连通或断开，以控制所述第二负载的启动或停止。
为实现上述目的，本申请提供了一种恒流控制系统，包括驱动模块、芯片和前述的恒流驱动电路，电阻R1与所述芯片的引脚VT1连接，所述电阻R3与所述芯片的引脚CS连接，储能模块的一端与所述驱动模块的输出端连接，另一端与所述芯片的引脚CH连接，负载模块包括第一负载、第二负载和电阻，所述第一负载的输入端与所述驱动模块连接，所述第一负载的输出端分别与所述第二负载的输入端和所述芯片的引脚OUT1连接，所述第二负载的输出端与所述芯片的引脚OUT2连接，所述电阻与所述芯片的引脚REXT连接，启停模块包括电阻R2，所述电阻R2的输入端与所述驱动模块的输出端连接，所述电阻R2的输出端分别与滤波电容C1和所述芯片的引脚VT2连接。
可选的，所述驱动模块包括与线网连接的整流桥和二极管D1，所述整流桥的输出端与所述二极管D1的输出端连接，所述二极管D1的输出端分别与所述电阻R2、储能模块和负载模块连接。
为实现上述目的，本申请提供了一种灯具，应用前述的恒流驱动电路，其中，所述负载模块为LED灯。
本申请的有益效果是：本申请的恒流驱动电路通过整流模块调整电解电容E1在充电或放电过程中的电流峰值与电流相位角，使得恒流驱动电路的输出电流能够满足新版国家标准中对相位角和THD的要求；通过调节电阻R1的阻值，以改变场效应管M1的连通或断开时间，进而调节电解电容E1的相位角；通过调节电阻R3的阻值，实现了对电解电容E1的电流峰值进行调节。
附图说明
图1是本申请优选实施例的驱动控制系统的电路图。
图2是图1中芯片的内部电路图。
附图标记说明：
恒流控制系统100，恒流驱动电路200，负载模块1，第一负载11，第二负载12，电阻13，储能模块2，电解电容E1，电阻R4，整流模块3，电阻R1，第一补偿电路31，第一基准电路32，第一比较器33，场效应管M1，电阻R3，第一供电电路34，第一保护器35，启停模块4，电阻R2，滤波电容C1，第二补偿电路41，第二基准电路42，第二开关电路43，场效应管M2，第二比较器431，第三开关电路44，第三比较器441，场效应管M3，第二保护器45，第二供电电路46，驱动模块5，整流桥51，二极管D1，芯片6。
具体实施方式
为了使本申请的目的、技术方案和优点更加清楚，下面结合附图和具体实施例对本申请进行详细描述。
请参阅图1和图2所示，本申请揭示了一种恒流驱动电路200，用于调节电路输出电流的相位角和峰值，使得恒流驱动电路200能够满足新版国家标准，进而使得应用该电路的产品能够顺利上市，并满足消费者的消费需求。
恒流驱动电路200包括负载模块1、启停模块4、储能模块2和整流模块3，其中，启停模块4与负载模块1的输出端连接，以控制负载模块1的启动和停止；储能模块2与负载模块1的输入端连接，以在负载模块1输入高电压时充电，而在负载模块1输入低电压时放电，以保持电路负载模块1正常运行，提高产品运行的稳定性；整流模块3连接于储能模块2的输出端，以控制流经储能模块2的电流角度和电流峰值。
具体的，整流模块3包括电阻R1、第一补偿电路31、第一基准电路32、第一比较器33、场效应管M1以及电阻R3，电阻R1的输入端与负载模块1的输出端连接，电阻R1的输出端与第一补偿电路31的输入端连接，第一补偿电路31的输出端与第一基准电路32的 输入端连接，第一基准电路32的输出端与第一比较器33的正相输入端连接，第一比较器33的输出端与场效应管M1的栅极连接，场效应管M1的漏极与储能模块2连接，场效应管M1的源极分别与第一比较器33的反向输入端和电阻R3的输入端连接，电阻R3的输出端与负载模块1的输出端连接并接地，以通过电阻R3控制储能模块2的电流峰值。
如此设置，当负载模块1两端的电压升高时，整流模块3能够通过电阻R1两端的电压差对负载模块1的电压进行检测，同时，第一补偿电路31控制第一基准电路32产生不同的基准电压，通过第一比较器33进行比较，进而控制场效应管M1的连通和断开，进而实现对储能模块2的电流角度进行控制。具体的，调节电阻R1的阻值，以改变电阻R1两端的电压差，进而改变第一基准电路32的基准电压，以实现对电流角度的调节。
电阻R3与储能模块2串联设置，通过调节电阻R3的阻值，即可调节流经电阻R3的最大电流，即电流的峰值，进而实现对储能模块2的峰值电流进行调节。
储能模块2包括电解电容E1和与电解电容E1并联的电阻R4，电解电容E1的正极与负载模块1的输入端连接，电解电容E1的负极与场效应管M1的漏极连接，调整电阻R1的阻值，以控制场效应管M1的连通或断开，以改变电解电容E1充放电时的电流角度。
整流模块3还包括与第一基准电路32连接的温度保护器，温度保护器能够检测恒流驱动电路200的使用温度，当温度较高时，能够控制第一基准电路32，进而控制恒流驱动电路200的输出功率，使得输出功率降低，以实现对恒流驱动电路200的降温，实现了对恒流驱动电路200的保护，避免高温导致恒流驱动电路200出现异常。
负载模块1包括串联连接的第一负载11、第二负载12和电阻13，储能模块2的输入端与第一负载11的输入端连接，电阻R1与第二负载12的输出端连接，电阻13的输入端分别与第一负载11和第二负载12的输出端连接，电阻13的输出端接地。通过将储能模块2的输入端与第一负载11的输入端连接，使得储能模块2在负载模块1电压较低时能够对负载模块1进行供电，以保持负载模块1的正常运行。通过设置电阻13，以实现对负载模块1的电流进行控制。
本实施例中，电阻13设有并联设置的两个，分别定义为电阻R5A和电阻R5B，以实现对电阻13的发热量进行控制，当然，在其它实施例中，电阻13可以设为一个、并联设置的三个、五个等，只要能够实现对电阻13的发热量进行控制，使得电阻13正常工作即可，此处不做限制。
启停模块4包括电阻R2、滤波电容C1、第二补偿电路41、第二基准电路42、第二开关电路43和第三开关电路44，电阻R2的输入端连接负载模块1的输入端，电阻R2的输出端分别与滤波电容C1和第二补偿电路41的输入端连接，滤波电容C1的输出端接地，第二补偿电路41与第二基准电路42连接，第二开关电路43的输入端与第一负载11的输出端连接，第二开关电路43的输出端与电阻13连接，以控制第一负载11的启动或停止，第三开关电路44的输入端与第二负载12的输出端连接，第三开关电路44的输出端与电阻13 连接，以控制第二负载12的启动或停止，第二基准电路42产生基准电压，并输入第二开关电路43和第三开关电路44，以分别控制第一负载11和第二负载12的启动或停止。
通过在电阻R2的输出端设置滤波电容C1，使得滤波电容C1能够在恒流驱动电路200工作时充放电，调整第二基准电路42产生的基准电压，进而实现对第一开关电路和第二开关电路43进行控制，实现对第二负载12的启动或停止。
第二开关电路43包括第二比较器431和场效应管M2，第二基准电路42与第二比较器431的正相输入端连接，场效应管M2的源极分别与电阻13和第二比较器431的负相输入端连接，场效应管M2的漏极与第一负载11的输出端连接，第二比较器431控制场效应管M2的连通或断开，以控制第一负载11的启动或停止。具体的，第二比较器431能够产生比较器基准，并将该基准与第二基准电路42产生的基准电压进行比较，判断是否需要导通或关断场效应管M2，以实现第一负载11的启动或停止。
同理，第三开关电路44包括第三比较器441和场效应管M3，第二基准电路42与第三比较器441的正相输入端连接，场效应管M3的源极分别与电阻13和第三比较器441的负相输入端连接，场效应管M3的漏极与第二负载12的输出端连接，第三比较器441控制场效应管M3的连通或断开，以控制第二负载12的启动或停止。第三比较器441能够产生比较器基准，并将该基准与第二基准电路42产生的基准电压进行比较，判断是否需要导通或关断场效应管M3，以实现第二负载12的启动或停止。
本实施例中，第二比较器431的基准低于第三比较器441的基准，使得第二基准电路42产生的基准电压能够通过第二比较器431和第三比较器441控制仅场效应管M2连通，或场效应管M2和场效应管M3均连通，当电压高时，接入第二负载12，以对第一负载11和进行分压，避免第一负载11因电压过高而导致击穿。
恒流驱动电路200还可以包括驱动模块5，以给负载模块1供电，以驱动负载模块1工作，驱动模块5包括与线网连接的整流桥51和二极管D1，整流桥51的输出端与二极管D1的输出端连接，二极管D1的输出端分别与电阻R2、储能模块2和负载模块1连接。
本实施例中，第一补偿电路31、第一基准电路32、第一保护器35、第二补偿电路41、第二基准电路42和第二保护器45的具体电路结构可以根据现有技术进行设置，此处不做限制。
总的来说，本申请的技术方案包括四条回路，分别为电解电容E1的充电回路，电解电容E1的放电回路，第一负载11的工作回路，第一负载11和第二负载12的工作回路，其中，当整流桥51的电压较高时，第一负载11和第二负载12的工作回路和电解电容的E1的充电回路连通；当整流桥51的电压与第一负载11的工作电压接近时，第一负载11的工作回路连通；当整流桥51的电压较低时，电解电容E1的放电回路连通。
具体的，在电解电容E1的充电回路中，电流从整流桥51输出并经过二极管D1后分别流向电解电容E1、第一负载11和第二负载12，并通过流过第二负载12后能够流向电阻R1， 使得电阻R1的出现电压差，并通过第一补偿电路31、第一基准电路32和第一比较器33控制场效应管M1的连通或关断，电解电容E1的负极通过场效应管M1、电阻R3并接地设置，使得电解电容E1能够形成完整的回路，进而实现对电解电容E1的充电。
在电解电容的放电回路中，电流从电解电容E1的正极输出，并经过第一负载11和/或第二负载12，随后经过电阻13、电阻R3并通过场效应管M1流向电解电容E1的负极，以形成电解电容E1向第一负载11和/或第二负载12的供电回路，以在整流桥51电压较低时，通过电解电容E1对负载模块1进行供电，保持负载模块1的正常运行。
在第一负载11的工作回路中，整流桥51输出的电流分别流向电阻R2和第一负载11，电流经电阻R2后输出至第二补偿电路41和第二基准电路42，通过第二基准电路42控制第二开关电路43连通，此时第三开关电路44断开，使得第一负载11连通，而第二负载12关断，流经第一负载11的电流流经场效应管M2后经电阻13接地，以形成第一负载11的工作回路。
在第一负载11和第二负载12的工作回路中，第二基准电路42控制第二开关电路43和第三开关电路44连通，使得第一负载11和第二负载12均连通，电流流经第一负载11、第二负载12和电阻13后接地，以形成第一负载11和第二负载12的工作回路。
请参阅图1和图2所示，本申请还提供了一种恒流控制系统100，包括驱动模块5、芯片6和前述的恒流驱动电路200，将恒流控制电路中的部分元器件集成在芯片6中，提高了恒流控制系统100的集成度，同时降低了恒流控制系统100的生产成本。
具体的，电阻R1与芯片6的引脚VT1连接，电阻R3与芯片6的引脚CS连接，储能模块2的一端与驱动模块5的输出端连接，另一端与芯片6的引脚CH连接。整流模块3中的第一补偿电路31、第一基准电路32、第一比较器33和场效应管M1均集成在芯片6内，第一补偿电路31的一端与芯片6的引脚VT1连接，另一端与第一基准电路32连接，第一基准电路32与第一比较器33的正相输入连接，第一比较器33与场效应管M1的栅极连接，场效应管M1的源极与第一比较器33的负相输入以及芯片6的引脚CS连接，场效应管M1的漏极与芯片6的引脚CH连接。
具体的，整流模块3还包括设于芯片6内的第一供电电路34和第一保护器35，其中，第一供电电路34的一端与芯片6的CH引脚连接，另一端与芯片6连接，以向芯片6供电。第一保护器35为温度保护器，设于芯片6内部并与第一基准电路32连接，以避免温度过高导致芯片6损坏。优选的，芯片6内设有GND端，电阻R3连接芯片6的引脚CS和GND端，以实现电阻R3接地。
负载模块1包括第一负载11、第二负载12和电阻13，第一负载11的输入端与驱动模块5连接，第一负载11的输出端分别与第二负载12的输入端和芯片6的引脚OUT1连接，第二负载12的输出端与芯片6的引脚OUT2连接，电阻13与芯片6的引脚REXT连接，启停模块4包括电阻R2，电阻R2的输入端与驱动模块5的输出端连接，电阻R2的输出端 分别与滤波电容C1和芯片6的引脚VT2连接。
启停模块4中的第二补偿电路41、第二基准电路42和第二开关电路43均集成在芯片6内，第二补偿电路41的一端与芯片6的引脚VT2连接，另一端与第二基准电路42连接，第二基准电路42分别与第二比较器431和第三比较器441的正相输入连接，第二比较器431与场效应管M2的栅极连接，场效应管M2的源极与第二比较器431的负相输入以及芯片6的引脚REXT连接，场效应管M2的漏极与芯片6的引脚OUT1连接；第三比较器441与场效应管M3的栅极连接，场效应管M3的源极与第二比较器431的负相输入以及芯片6的引脚REXT连接，场效应管M3的漏极与芯片6的引脚OUT2连接。
具体的，启停模块4还包括设于芯片6内的第二供电电路46和第二保护器45，其中，第二供电电路46的一端与芯片6的引脚OUT1连接，另一端与芯片6连接，以向芯片6供电。第二保护器45为温度保护器，设于芯片6内部并与第二基准电路42连接，以避免温度过高导致芯片6损坏。
驱动模块5包括与线网连接的整流桥51和二极管D1，整流桥51的输出端与二极管D1的输出端连接，二极管D1的输出端分别与电阻R2、储能模块2和负载模块1连接。通过设置二极管D1，使得整流桥51的电流能够流经二极管D1后流向储能模块2和负载模块1，而当储能模块2放电时，电流无法穿过二极管D1流向整流桥51。
本申请还提供了一种灯具，包括底座、边框、面罩和设有前述恒流驱动电路200的电路板等，其中，负载模块1为LED灯，第一负载11为第一灯串，第二负载12为第二灯串，电路板上还设有驱动模块5，驱动模块5组装在电路板上并与外部线网连接，将线网的交流电转换为直流电以向恒流驱动电路200供电。当然，在其它实施例中，电路板上可以设置为恒流控制系统100，通过将恒流驱动电路200中的部分结构集成在芯片6上，以提高电路板的集成度，进而降低电路板的成本，此处不做限制。
本实施例中，灯具包括但不限于筒射灯、球泡灯、发光模组、吸顶灯、路灯、工矿灯等，当然，在其它实施例中，恒流控制系统100和恒流驱动电路200还可以设置在其它电子领域的产品中，此处不做限制。
综上所述，本申请的恒流驱动电路200通过整流模块3调整电解电容E1在充电或放电过程中的电流峰值与电流相位角，使得恒流驱动电路200的输出电流能够满足新版国家标准中对相位角和THD的要求；通过调节电阻R1的阻值，以改变场效应管M1的连通或断开时间，进而调节电解电容E1的相位角；通过调节电阻R3的阻值，实现了对电解电容E1的电流峰值进行调节；通过设置第一保护器35和第二保护器45，以提高恒流控制系统100的安全性。
以上实施例仅用以说明本申请的技术方案而非限制，尽管参照较佳实施例对本申请进行了详细说明，本领域的普通技术人员应当理解，可以对本申请的技术方案进行修改或者等同替换，而不脱离本申请技术方案的精神和范围。

Claims (10)

  1. 一种恒流驱动电路，其中，包括：
    负载模块(1)；
    启停模块(4)，与所述负载模块(1)的输出端连接，以控制所述负载模块(1)的启动和停止；
    储能模块(2)，连接于所述负载模块(1)的输入端，以在所述负载模块(1)输入高电压时充电，而在所述负载模块(1)输入低电压时放电；
    整流模块(3)，连接于所述储能模块(2)的输出端，以控制流经所述储能模块(2)的电流角度和电流大小；
    所述整流模块(3)包括电阻R1、第一补偿电路(31)、第一基准电路(32)、第一比较器(33)、场效应管M1以及电阻R3，所述电阻R1的输入端与所述负载模块(1)的输出端连接，所述电阻R1的输出端与所述第一补偿电路(31)的输入端连接，所述第一补偿电路(31)的输出端与所述第一基准电路(32)的输入端连接，所述第一基准电路(32)的输出端与所述第一比较器(33)的正相输入端连接，所述第一比较器(33)的输出端与所述场效应管M1的栅极连接，所述场效应管M1的漏极与所述储能模块(2)连接，所述场效应管M1的源极分别与所述第一比较器(33)的反向输入端和所述电阻R3的输入端连接，所述电阻R3的输出端与所述负载模块(1)的输出端连接并接地，以通过所述电阻R3控制所述储能模块(2)的电流峰值。
  2. 根据权利要求1所述的恒流驱动电路，其中，所述储能模块(2)包括电解电容E1和与所述电解电容E1并联的电阻R4，所述电解电容E1的正极与所述负载模块(1)的输入端连接，所述电解电容E1的负极与所述场效应管M1的漏极连接，调整所述电阻R1的阻值，以控制所述场效应管M1的连通或断开，以改变所述电解电容E1充放电时的电流角度。
  3. 根据权利要求1所述的恒流驱动电路，其中，所述整流模块(3)还包括与所述第一基准电路(32)连接的温度保护器。
  4. 根据权利要求1所述的恒流驱动电路，其中，所述负载模块(1)包括串联连接的第一负载(11)、第二负载(12)和电阻(13)，所述储能模块(2)的输入端与所述第一负载(11)的输入端连接，所述电阻R1与所述第二负载(12)的输出端连接，所述电阻(13)的输入端分别与所述第一负载(11)和所述第二负载(12)的输出端连接，所述电阻(13)的输出端接地。
  5. 根据权利要求4所述的恒流驱动电路，其中，所述启停模块(4)包括电阻R2、滤波电容C1、第二补偿电路(41)、第二基准电路(42)、第二开关电路(43)和第三开关电路(44)，所述电阻R2的输入端连接所述负载模块(1)的输入端，所述电阻R2的输出端分别与所述滤波电容C1和所述第二补偿电路(41)的输入端连接，所述滤波电容C1的输出端接地，所述第二补偿电路(41)与所述第二基准电路(42)连接，所述第二开关电路(43)的输入端与所述第一负载(11)的输出端连接，所述第二开关电路(43)的输出端与所述电阻(13)连接，以控制所述第一负载(11)的启动或停止，所述第三开关电路(44)的输入端与所述第二负载(12)的输出端连接， 所述第三开关电路(44)的输出端与所述电阻(13)连接，以控制所述第二负载(12)的启动或停止，所述第二基准电路(42)产生基准电压，并输入所述第二开关电路(43)和第三开关电路(44)，以分别控制所述第一负载(11)和所述第二负载(12)的启动或停止。
  6. 根据权利要求5所述的恒流驱动电路，其中，所述第二开关电路(43)包括第二比较器(431)和场效应管M2，所述第二基准电路(42)与所述第二比较器(431)的正相输入端连接，所述场效应管M2的源极分别与所述电阻(13)和所述第二比较器(431)的负相输入端连接，所述场效应管M2的漏极与所述第一负载(11)的输出端连接，所述第二比较器(431)控制所述场效应管M2的连通或断开，以控制所述第一负载(11)的启动或停止。
  7. 根据权利要求5所述的恒流驱动电路，其中，所述第三开关电路(44)包括第三比较器(441)和场效应管M3，所述第二基准电路(42)与所述第三比较器(441)的正相输入端连接，所述场效应管M3的源极分别与所述电阻(13)和所述第三比较器(441)的负相输入端连接，所述场效应管M3的漏极与所述第二负载(12)的输出端连接，所述第三比较器(441)控制所述场效应管M3的连通或断开，以控制所述第二负载(12)的启动或停止。
  8. 一种恒流控制系统，其中，包括驱动模块(5)、芯片(6)和如权利要求1-7中任一项所述的恒流驱动电路(200)，电阻R1与所述芯片(6)的引脚VT1连接，所述电阻R3与所述芯片(6)的引脚CS连接，储能模块(2)的一端与所述驱动模块(5)的输出端连接，另一端与所述芯片(6)的引脚CH连接，负载模块(1)包括第一负载(11)、第二负载(12)和电阻(13)，所述第一负载(11)的输入端与所述驱动模块(5)连接，所述第一负载(11)的输出端分别与所述第二负载(12)的输入端和所述芯片(6)的引脚OUT1连接，所述第二负载(12)的输出端与所述芯片(6)的引脚OUT2连接，所述电阻(13)与所述芯片(6)的引脚REXT连接，启停模块(4)包括电阻R2，所述电阻R2的输入端与所述驱动模块(5)的输出端连接，所述电阻R2的输出端分别与滤波电容C1和所述芯片(6)的引脚VT2连接。
  9. 根据权利要求8所述的恒流控制系统，其中，所述驱动模块(5)包括与线网连接的整流桥(51)和二极管D1，所述整流桥(51)的输出端与所述二极管D1的输出端连接，所述二极管D1的输出端分别与所述电阻R2、储能模块(2)和负载模块(1)连接。
  10. 一种灯具，其中，应用如权利要求1-7中任一项所述的恒流驱动电路(200)，其中，所述负载模块(1)为LED灯。
PCT/CN2024/100278 2023-06-29 2024-06-20 恒流驱动电路、恒流控制系统及灯具 Ceased WO2025001950A1 (zh)

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