EP-4739000-A1 - DRIVE CIRCUIT, DRIVE CONTROLLER, AND LAMP

EP4739000A1EP 4739000 A1EP4739000 A1EP 4739000A1EP-4739000-A1

Abstract

Provided in the present disclosure are a drive circuit, a drive controller, and a lamp. The drive circuit comprises a load module, an energy storage module, a constant-current control module and a sampling signal module, wherein the load module comprises a first load and a second load, which are connected to a power supply module; the energy storage module is connected to the first load, the power supply module charges the energy storage module, and the energy storage module can supply power to the load module; the constant-current control module comprises a first control unit and a fourth control unit, which are connected to the second load in parallel, and a second control unit and a third control unit, which are connected to the second load in series; and the sampling signal module comprises a diode D1 and a sampling module, which are arranged between the power supply module and the energy storage module, the sampling module sampling an output voltage of the power supply module and controlling the connection or disconnection of the first control unit, the second control unit, the third control unit and the fourth control unit. In the present disclosure, an energy storage module and a constant-current control module are configured, such that a load can realize constant-current output when a voltage fluctuation is relatively large, thereby avoiding stroboflash of a lamp bead during the voltage fluctuation.

Inventors

CHEN, FENG
LI, ZHAOHUA
SUN, XIAOBING
FANG, Jitong

Assignees

Suzhou Opple Lighting Co., Ltd.
Opple Lighting Co., Ltd.
Shenzhen Sunmoon Microelectronics Co., Ltd

Dates

Publication Date: 20260506
Application Date: 20240620

Claims (10)

A driving circuit, connected to a power supply module (1), comprising: a load module (7) comprises a first load (71) and a second load (72) that are connected in series, and the first load (71) is connected with the power supply module (1); an energy storage module (3) connected to an input terminal of the first load (71), wherein the energy storage module (3) is charged when the power supply module (1) outputs a high voltage, and power is supplied to the load module (7) by the energy storage module (3) when the power supply module (1) outputs a low voltage; a constant current control module (4), comprising a first control unit (411) and a fourth control unit (423) that are connected in parallel with the second load (72), and a second control unit (413) and a third control unit (421) that are connected in series with the second load (72), to control the start or stop of the second load (72); and a sampling signal module (5), comprising a diode D1 and a sampling module (6), wherein the diode D1 is arranged between the power supply module (1) and the energy storage module (3), and the sampling module (6) is connected with an output terminal of the power supply module (1) to sample an output voltage of the power supply module (1) and control the first control unit (411), the second control unit (413), the third control unit (421) and the fourth control unit (423) to be turned on or turned off.
The driving circuit according to claim 1, wherein the energy storage module (3) comprises an energy storage capacitor C1, and the constant current control module (4) comprises a resistor R3, one terminal of the resistor R3 is connected with the first control unit (411) and the second control unit (413), and other terminal of the resistor R3 is connected with the energy storage capacitor C1, and other terminal of the energy storage capacitor C1 is connected with the first load (71), to form a discharging loop circuit.
The driving circuit according to claim 2, wherein the energy storage module (3) comprises a diode D2, one terminal of the diode D2 is connected with the energy storage capacitor C1, and other terminal of the diode D2 is grounded, to form a charging loop circuit of the energy storage capacitor C1.
The driving circuit according to claim 1, wherein the constant current control module (4) comprises a resistor R4, one terminal of the resistor R4 is connected with the third control unit (421) and the fourth control unit (423), and other terminal of the resistor R4 is grounded.
The driving circuit according to claim 1, wherein the sampling module (6) comprises a comparator (61), the sampling module (6) samples the voltage of the power supply module (1), inputs a sampling result into the comparator (61), and compares the sampling result with a fixed reference of the comparator (61); if the sampling voltage is not less than the fixed reference, the comparator (61) outputs a first control signal to control the third control unit (421) and the fourth control unit (423) to be turned on or turned off.
The driving circuit according to claim 5, wherein the third control unit (421) comprises a third controller (422) and a third transistor M3, one terminal of the third transistor M3 is connected to the third controller (422), another terminal of the third transistor M3 is connected to an output terminal of the second load (72), and still another terminal of the third transistor M3 is grounded; the third controller (422) receives the first control signal, and compares the first control signal with a third reference of the third controller (422); if the first control signal is equal to the third reference, the third controller (422) controls the third transistor M3 to be turned on; the fourth control unit (423) comprises a fourth controller (424) and a fourth transistor M4, one terminal of the fourth transistor M4 is connected with the fourth controller (424), another terminal of the fourth transistor M4 is connected with an input terminal of the second load (72), and still another terminal of the fourth transistor M4 is grounded; the fourth controller (424) receives the first control signal, and compares the first control signal with a fourth reference of the fourth controller (424); if the first control signal is equal to the fourth reference, the fourth controller (424) controls the fourth transistor M4 to be turned on.
The driving circuit according to claim 5, wherein the sampling module (6) further comprises a converter (62) connected with the comparator (61), and if a sampling voltage is less than the fixed reference, the comparator (61) controls the converter (62) to output a second control signal to control the first control unit (411) and the second control unit (61) to be turned on or turned off.
The driving circuit according to claim 7, wherein the second control unit (413) comprises a second controller (414) and a second transistor M2, one terminal of the second transistor M2 is connected to the second controller (414), another terminal of the second transistor M2 is connected to an output terminal of the second load (72), and still another terminal of the second transistor M2 is connected to the energy storage module (3); the second controller (414) receive the second control signal and compares the second control signal with a second reference of the second controller (414); if the second control signal is equal to the second reference, the second controller (414) controls the second transistor M2 to be turned on; the first control unit (411) comprises a first controller (412) and a first transistor M1, one terminal of the first transistor M1 is connected with the first controller (412), another terminal of the first transistor M1 is connected with an input terminal of the second load (72), and still another terminal of the first transistor M1 is connected with the energy storage module (3); the first controller (412) receives the second control signal and compares the second control signal with a first reference of the first controller (412); if the second control signal is equal to the first reference, the first controller (412) controls the first transistor M1 to be turned on.
A drive controller, comprising a power supply module (1) and the drive circuit (200) according to any one of claims 1-8, wherein the power supply module (1) converts an alternating current of a power grid into a direct current to supply power to the drive circuit (200), and part of the drive circuit (200) is arranged in a chip (2), the constant current control module (4) is provided with a first control module (41) comprising the first control unit (411) and the second control unit (413), and a second control module (42) comprising a third control unit (421) and a fourth control unit (423); an isolation device is arranged in the chip (2), the isolation device separates the first control module (41) and the second control module (42), so that a discharge loop circuit is formed between the first control module (41) and the energy storage module (3).
A lamp, comprising the driving circuit (200) according to any one of claims 1-8.

Description

The present disclosure claims priority to the Chinese patent application No. 202310786893.6, filed on June 30, 2023, with the invention name of "DRIVE CIRCUIT, DRIVE CONTROLLER, AND LAMP", and the Chinese patent application No. 202321689790.X, filed on June 30, 2023, with the invention name of "DRIVE CIRCUIT, DRIVE CONTROLLER, AND LAMP", the entire contents of which are incorporated herein by reference as part of the present disclosure. TECHNICAL FIELD The present disclosure relates to a driving circuit, a driving controller and a lamp, and belongs to the technical field of driving circuit. BACKGROUND With the continuous development of LED lighting industry, the constant current control chip is required to have the characteristics of high integration, good circuit performance and small size, at the same time, the LED lighting performance index is gradually improving, which makes the certification requirements of linear constant current drive system higher and higher. At present, a linear constant-current drive control system with high power factor has appeared in the market, which is mainly used to realize the constant-current output of LED in commercial AC power above 220V. However, for AC power below 220V or AC power with wide fluctuation range, LED still cannot realize the constant-current output at present, which causes LED to generate perceptible low-frequency ripple strobes under AC power below 220 V, and long-term low-frequency ripple strobes will cause harm to human eyes. As shown in Fig. 1, the scheme of traditional high PF without strobes realizes the constant current output of LED by controlling the charge and discharge of the input capacitor E1. When the fluctuation of commercial power decreases, LED cannot realize the constant current output. In view of this, it is really necessary to propose a driving circuit, a driving controller and a lamp to solve the above problems. SUMMARY The purpose of the present disclosure is to provide a driving circuit, a driving controller and a lamp, so as to solve the problem that in the prior art, an LED cannot realize constant current output when the fluctuation of commercial power decreases. In order to achieve the above object, the present disclosure provides a driving circuit, connected to a power supply module, comprising: a load module comprises a first load and a second load that are connected in series, and the first load is connected with the power supply module;an energy storage module connected to an input terminal of the first load, wherein the energy storage module is charged when the power supply module outputs a high voltage, and power is supplied to the load module by the energy storage module when the power supply module outputs a low voltage;a constant current control module, comprising a first control unit and a fourth control unit that are connected in parallel with the second load, and a second control unit and a third control unit that are connected in series with the second load to control the start or stop of the second load; anda sampling signal module, comprising a diode D1 and a sampling module, wherein the diode D1 is arranged between the power supply module and the energy storage module, and the sampling module is connected with an output terminal of the power supply module to sample an output voltage of the power supply module and control the first control unit, the second control unit, the third control unit and the fourth control unit to be turned on or turned off. Optionally, the energy storage module comprises an energy storage capacitor C1, and the constant current control module comprises a resistor R3, one terminal of the resistor R3 is connected with the first control unit and the second control unit, and the other terminal of the resistor R3 is connected with the energy storage capacitor C1, and other terminal of the energy storage capacitor C1 is connected with the first load, to form a discharging loop circuit. Optionally, the energy storage module comprises a diode D2, one terminal of the diode D2 is connected with the energy storage capacitor C1, and the other terminal of the diode D2 is grounded, to form a charging loop circuit of the energy storage capacitor C1. Optionally, the constant current control module comprises a resistor R4, one terminal of the resistor R4 is connected with the third control unit and the fourth control unit, and the other terminal of the resistor R4 is grounded. Optionally, the sampling module comprises a comparator, the sampling module samples the voltage of the power supply module, inputs a sampling result into the comparator, and compares the sampling result with a fixed reference of the comparator; if the sampling voltage is not less than the fixed reference, the comparator outputs a first control signal to control the third control unit and the fourth control unit to be turned on or turned off. Optionally, the third control unit comprises a third controller and a third transistor M3, one