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EP-4738999-A1 - CONSTANT CURRENT DRIVING CIRCUIT, CONSTANT CURRENT CONTROL SYSTEM AND LAMP

EP4738999A1EP 4738999 A1EP4738999 A1EP 4738999A1EP-4738999-A1

Abstract

The present application provides a constant current drive circuit, a constant current control system, and a lamp. The constant current drive circuit includes a load module, a start-stop module for controlling the start and stop of the load module, an energy storage module, and a rectifier module for controlling the current angle and current magnitude of the load module circuit. The energy storage module can charge when the load module is input with a high voltage and discharge when the load module is input with a low voltage. The rectifier module includes a resistor R1, a first compensation circuit, a first reference circuit, a first comparator, and a field-effect transistor M1 connected in sequence, the drain electrode and the source electrode of the field-effect transistor M1 are respectively connected to the energy storage module and the resistor R3. The output terminal of the resistor R3 is connected to the output terminal of the load module and grounded, and the current peak value of the energy storage module is controlled through the resistor R3. In the present application, by adjusting the resistance value of the resistor R1, the on or off time of the field-effect transistor M1 is changed to adjust 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 further adjusted.

Inventors

  • SUN, XIAOBING
  • CHEN, FENG
  • HAN, JIANPING

Assignees

  • Suzhou Opple Lighting Co., Ltd.
  • Opple Lighting Co., Ltd.

Dates

Publication Date
20260506
Application Date
20240620

Claims (10)

  1. A constant current drive circuit, comprising: a load module (1); a start-stop module (4), connected to an output terminal of the load module (1) to control start and stop of the load module (1); an energy storage module (2), connected to an input terminal of the load module (1) to be charged when a high voltage is input to the load module (1) and be discharged when a low voltage is input to the load module (1); and a rectifier module (3), connected to an output terminal of the energy storage module (2) to control a current angle and current magnitude of a current flowing through the energy storage module (2); wherein the rectifier module (3) comprises 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, an input terminal of the resistor R1 is connected to the output terminal of the load module (1), and an output terminal of the resistor R1 is connected to an input terminal of the first compensation circuit (31), an output terminal of the first compensation circuit (31) is connected to an input terminal of the first reference circuit (32), and an output terminal of the first reference circuit (32) is connected to a non-inverting input terminal of the first comparator (33), an output terminal of the first comparator (33) is connected to a gate electrode of the field-effect transistor M1, a drain electrode of the field-effect transistor M1 is connected to the energy storage module (2), a source electrode of the field-effect transistor M1 is respectively connected to an inverting input terminal of the first comparator (33) and an input terminal of the resistor R3, an output terminal of the resistor R3 is connected to the output terminal of the load module (1) and grounded, to control a current peak value of the energy storage module (2) through the resistor R3.
  2. The constant current drive circuit according to claim 1, wherein the energy storage module (2) comprises an electrolytic capacitor E1 and a resistor R4 connected in parallel with the electrolytic capacitor E1, a positive electrode of the electrolytic capacitor E1 is connected to the input terminal of the load module (1), and a negative electrode of the electrolytic capacitor E1 is connected to the drain electrode of the field-effect transistor M1, a resistance value of the resistor R1 is adjusted to control on and off state of the field-effect transistor M1, to change a current angle of the electrolytic capacitor E1 during charging and discharging.
  3. The constant current drive circuit according to claim 1, wherein the rectifier module (3) further comprises a temperature protector connected to the first reference circuit (32).
  4. The constant current drive circuit according to claim 1, wherein the load module (1) comprises a first load (11), a second load (12), and a resistor (13) connected in series, the input terminal of the energy storage module (2) is connected to an input terminal of the first load (11), the resistor R1 is connected to an output terminal of the second load (12), an input terminal of the resistor (13) is respectively connected to output terminals of the first load (11) and the second load (12), and an output terminal of the resistor (13) is grounded.
  5. The constant current drive circuit according to claim 4, wherein the start-stop module (4) comprises 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), an input terminal of the resistor R2 is connected to the input terminal of the load module (1), and an output terminal of the resistor R2 is respectively connected to input terminals of the filter capacitor C1 and the second compensation circuit (41), an output terminal of the filter capacitor C1 is grounded, the second compensation circuit (41) is connected to the second reference circuit (42), an input terminal of the second switch circuit (43) is connected to an output terminal of the first load (11), and an output terminal of the second switch circuit (43) is connected to the resistor (13) to control start and stop of the first load (11), an input terminal of the third switch circuit (44) is connected to the output terminal of the second load (12), and an output terminal of the third switch circuit (44) is connected to the resistor (13) to control start and stop of the second load (12), the second reference circuit (42) generates a reference voltage and inputs the reference voltage to the second switch circuit (43) and the third switch circuit (44) to respectively control start and stop of the first load (11) and the second load (12).
  6. The constant current drive circuit according to claim 5, wherein the second switch circuit (43) comprises a second comparator (431) and a field-effect transistor M2, the second reference circuit (42) is connected to a non-inverting input terminal of the second comparator (431), a source electrode of the field-effect transistor M2 is respectively connected to the resistor (13) and an inverting input terminal of the second comparator (431), a drain electrode of the field-effect transistor M2 is connected to the output terminal of the first load (11), and the second comparator (431) controls on and off state of the field-effect transistor M2 to control start and stop of the first load (11).
  7. The constant current drive circuit according to claim 5, wherein the third switch circuit (44) comprises a third comparator (441) and a field-effect transistor M3, the second reference circuit (42) is connected to a non-inverting input terminal of the third comparator (441), a source electrode of the field-effect transistor M3 is respectively connected to the resistor (13) and an inverting input terminal of the third comparator (441), a drain electrode of the field-effect transistor M3 is connected to the output terminal of the second load (12), and the third comparator (441) controls on and off state of the field-effect transistor M3 to control start and stop of the second load (12).
  8. A constant current control system, comprising a drive module (5), a chip (6), and the constant current drive circuit (200) according to any one of claims 1-7, the resistor R1 is connected to a pin VT1 of the chip (6), and the resistor R3 is connected to a pin CS of the chip (6), one terminal of the energy storage module (2) is connected to an output terminal of the drive module (5), and the other terminal of the energy storage module (2) is connected to a pin CH of the chip (6), the load module (1) comprises a first load (11), a second load (12), and a resistor (13), an input terminal of the first load (11) is connected to the drive module (5), and an output terminal of the first load (11) is respectively connected to an input terminal of the second load (12) and a pin OUT1 of the chip (6), an output terminal of the second load (12) is connected to a pin OUT2 of the chip (6), and the resistor (13) is connected to a pin REXT of the chip (6), the start-stop module (4) comprises a resistor R2, an input terminal of the resistor R2 is connected to the output terminal of the drive module (5), and the output terminal of the resistor R2 is respectively connected to a filter capacitor C1 and a pin VT2 of the chip (6).
  9. The constant current control system according to claim 8, wherein the drive module (5) comprises a rectifier bridge (51) connected to a wire network and a diode D1, an output terminal of the rectifier bridge (51) is connected to an output terminal of the diode D1, and the output terminal of the diode D1 is respectively connected to the resistor R2, the energy storage module (2), and the load module (1).
  10. A lamp, comprising the constant current drive circuit (200) according to any one of claims 1-7, and the load module (1) is an LED lamp.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese patent applications filed on June 29, 2023, with application number 202310789354.8 and invention title "Constant Current Drive circuit, Constant Current Control System and Lamp", and on June 29, 2023, with application number 202321686484.0 and invention title "Constant Current Drive circuit, Constant Current Control System and Lamp". The entire contents of these patent applications are incorporated herein by reference. TECHNICAL FIELD The present application relates to a constant current drive circuit, a constant current control system, and a lamp, which belong to the technical field of integrated circuits. BACKGROUND With the release of the new national standard GB 17625.1-2022 "Electromagnetic Compatibility Limits - Part 1: Limits for Harmonic Current Emissions (Equipment Input Current per Phase ≤ 16 A)", most lamps involving multi-stage high-voltage linearity in lighting equipment fail to meet the emission limit of rated power ≤ 25 W. Although some products are designed using a single-stage high-voltage linearity solution that complies with the standard, single-stage high-voltage linearity products may fail to work normally when the voltage is low or fluctuates significantly. Similarly, existing multi-stage high-voltage linearity products also experience flickering or failure to work when the voltage is low or fluctuates; furthermore, existing multi-stage high-voltage linearity products cannot meet the requirements for phase angle and THD (Total Harmonic Distortion) specified in the new national standard. In view of this, it is necessary to propose a constant current drive circuit, a constant current control system, and a lamp to solve the above-mentioned problems. SUMMARY The purpose of the present application is to provide a constant current drive circuit, a constant current control system, and a lamp, so as to address the problems in the prior art where multi-stage high-voltage linearity products may fail to work when voltage fluctuates, and fail to meet the requirements for phase angle and THD specified in the new national standard. To achieve the above purpose, the present application provides a constant current drive circuit, including: a load module;a start-stop module, connected to an output terminal of the load module to control start and stop of the load module;an energy storage module, connected to an input terminal of the load module to be charged when a high voltage is input to the load module and be discharged when a low voltage is input to the load module; anda rectifier module, connected to an output terminal of the energy storage module to control a current angle and current magnitude of a current flowing through the energy storage module;where 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, an input terminal of the resistor R1 is connected to the output terminal of the load module, and an output terminal of the resistor is connected to an input terminal of the first compensation circuit, an output terminal of the first compensation circuit is connected to an input terminal of the first reference circuit, and an output terminal of the first reference circuit is connected to a non-inverting input terminal of the first comparator, an output terminal of the first comparator is connected to a gate electrode of the field-effect transistor M1, a drain electrode of the field-effect transistor M1 is connected to the energy storage module, a source electrode of the field-effect transistor M1 is respectively connected to an inverting input terminal of the first comparator and an input terminal of the resistor R3, an output terminal of the resistor R3 is connected to the output terminal of the load module and grounded, to control a current peak value of the energy storage module through the resistor R3. Optionally, the energy storage module includes an electrolytic capacitor E1 and a resistor R4 connected in parallel with the electrolytic capacitor E1, a positive electrode of the electrolytic capacitor E1 is connected to the input terminal of the load module, and a negative electrode of the electrolytic capacitor E1 is connected to the drain electrode of the field-effect transistor M1, a resistance value of the resistor R1 is adjusted to control on and off state of the field-effect transistor M1, to change a current angle of the electrolytic capacitor E1 during charging and discharging. Optionally, the rectifier module further includes a temperature protector connected to the first reference circuit. Optionally, the load module includes a first load, a second load, and a resistor connected in series, the input terminal of the energy storage module is connected to an input terminal of the first load, the resistor R1 is connected to an output terminal of the second load, an input terminal of the r