Constant current driving circuit, constant current control system and lamp

Abstract

The present application provides a constant current driving circuit, a constant current control system and a lamp. The constant current driving circuit comprises a load module, a start-stop module for controlling the load module to start and stop, an energy storage module, and a rectification module for controlling the circuit angle and the current magnitude of the load module; the energy storage module can be charged when a high voltage is input into the load module and can be discharged when a low voltage is input into the load module; the rectification module comprises a resistor R1, a first compensation circuit, a first reference circuit, a first comparator, and a field effect transistor M1 which are sequentially connected; a drain and a source of the field effect transistor M1 are connected to the energy storage module and a resistor R3, respectively; and an output end of the resistor R3 is connected to an output end of the load module and is grounded, so as to control the current peak value of the energy storage module by means of the resistor R3. According to the present application, by adjusting the resistance of the resistor R1, the connection time or disconnection time of the field effect transistor M1 is changed, so as to adjust the phase angle of an electrolytic capacitor E1; and the current peak of the electrolytic capacitor E1 is adjusted by adjusting the resistance of the resistor R3.

Description

Constant current drive circuit, constant current control system and lamp

[0001] This application claims priority to Chinese patent applications with application date of June 29, 2023, application number 202310789354.8, invention name “Constant current drive circuit, constant current control system and lamp” and application date of June 29, 2023, application number 202321686484.0, invention name “Constant current drive circuit, constant current control system and lamp”. The entire contents of the patent applications are incorporated into this application by reference. Technical Field

[0002] 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. Background Art

[0003] With the release of the new national standard GB 17625.1-2022, "Electromagnetic Compatibility Limits - Part 1: Harmonic Current Emission Limits (Equipment Input Current ≤ 16A per Phase)," most lighting fixtures involving multi-segment high-voltage linear devices no longer meet the emission limits for a rated power of ≤25W. Although some products are designed with single-segment, standard-compliant high-voltage linear solutions, single-segment high-voltage linear products may malfunction when the voltage is low or when the voltage fluctuates significantly. Similarly, existing multi-segment high-voltage linear products may flicker or malfunction when the voltage is low or fluctuating. Furthermore, these products cannot meet the phase angle and THD (harmonic distortion) requirements of the new national standard.

[0004] In view of this, it is indeed necessary to propose a constant current driving circuit, a constant current control system and a lamp to solve the above problems.

[0005] Summary of the Invention

[0006] 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-segment 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.

[0007] To achieve the above objectives, the present application provides a constant current drive circuit, comprising:

[0008] Load module;

[0009] A start-stop module, connected to the output end of the load module to control the start and stop of the load module;

[0010] an energy storage module connected to an input terminal of the load module, so as to be charged when a high voltage is input to the load module and to be discharged when a low voltage is input to the load module;

[0011] 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;

[0012] 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 inverting 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 current peak of the energy storage module through the resistor R3.

[0013] Optionally, 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.

[0014] Optionally, the rectifier module further includes a temperature protector connected to the first reference circuit.

[0015] Optionally, 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 connected to the output ends of the first load and the second load respectively, and the output end of the resistor is grounded.

[0016] Optionally, the start-stop module includes a resistor R2, a filter capacitor C1, a second compensation circuit, a second reference circuit, a second switching circuit and a third switching 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 switching circuit is connected to the output end of the first load, and the output end of the second switching circuit is connected to the resistor to control the start or stop of the first load. The input end of the third switching circuit is connected to the output end of the second load, and the output end of the third switching 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 switching circuit and the third switching circuit to control the start or stop of the first load and the second load, respectively.

[0017] Optionally, 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.

[0018] Optionally, 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.

[0019] To achieve the above-mentioned objectives, 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 VT2 of the chip.

[0020] Optionally, the driving module includes a rectifier bridge and a diode D1 connected to the line 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.

[0021] To achieve the above-mentioned objectives, the present application provides a lamp, which applies the above-mentioned constant current drive circuit, wherein the load module is an LED lamp.

[0022] The beneficial effects of the present application are: the constant current drive circuit 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, 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, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a circuit diagram of a drive control system according to a preferred embodiment of the present application.

[0024] FIG2 is an internal circuit diagram of the chip in FIG1 .

[0025] Description of reference numerals:

[0026] 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 transistor 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 switching circuit 43, field effect transistor M2, second comparator 431, third switching circuit 44, third comparator 441, field effect transistor M3, second protector 45, second power supply circuit 46, drive module 5, rectifier bridge 51, diode D1, chip 6. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of this application clearer, this application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Please refer to Figures 1 and 2. The present application discloses a constant current drive circuit 200, which is used to adjust 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.

[0029] 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 the load module 1 inputs a high voltage, and discharge when the load module 1 inputs a low voltage, 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.

[0030] Specifically, 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 input end of the first reference circuit 32, 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 transistor M1, the drain of the field effect transistor M1 is connected to the energy storage module 2, the source of the field effect transistor M1 is respectively connected to the inverting 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 grounded, so as to control the current peak of the energy storage module 2 through the resistor R3.

[0031] With this configuration, when the voltage across the load module 1 increases, the rectifier module 3 can detect the voltage of the load module 1 through the voltage difference across the resistor R1. Simultaneously, the first compensation circuit 31 controls the first reference circuit 32 to generate different reference voltages, which are compared via the first comparator 33 to control the connection and disconnection of the field-effect transistor M1, thereby controlling the current angle of the energy storage module 2. Specifically, the resistance 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.

[0032] The resistor R3 is connected in series with the energy storage module 2 . By adjusting the resistance of the resistor R3 , 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 .

[0033] 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, so as to change the current angle during the charging and discharging of the electrolytic capacitor E1.

[0034] 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 avoiding abnormalities in the constant current drive circuit 200 caused by high temperature.

[0035] Load module 1 includes a first load 11, a second load 12, and a resistor 13 connected in series. The input of energy storage module 2 is connected to the input of first load 11, resistor R1 is connected to the output of second load 12, and the input of resistor 13 is connected to the outputs of first load 11 and second load 12, respectively. The output of resistor 13 is grounded. By connecting the input of energy storage module 2 to the input of first load 11, energy storage module 2 can supply power to load module 1 when the voltage of load module 1 is low, thereby maintaining the normal operation of load module 1. By providing resistor 13, the current of load module 1 can be controlled.

[0036] In this embodiment, two resistors 13 are provided in parallel, which are defined as resistor R5A and resistor R5B, so as to control the heat generated by the resistor 13. Of course, in other embodiments, the resistor 13 can be set to one, three, five, etc., which are provided in parallel. As long as the heat generated by the resistor 13 can be controlled and the resistor 13 can work normally, there is no limitation here.

[0037] 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 input end of the filter capacitor C1 and 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, the output end of the third switch circuit 44 is connected to the resistor 13 to control the start or stop of the second load 12. 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.

[0038] 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, adjusting the reference voltage generated by the second reference circuit 42, and then controlling the first switch circuit and the second switch circuit 43 to start or stop the second load 12.

[0039] The second switching circuit 43 includes a second comparator 431 and a field-effect transistor M2. The second reference circuit 42 is connected to the non-inverting input terminal of the second comparator 431. The source of the field-effect transistor M2 is connected to the resistor 13 and the negative 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. 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. Specifically, the second comparator 431 can generate a comparator reference and compare this reference with the reference voltage generated by the second reference circuit 42 to determine whether to turn on or off the field-effect transistor M2 to start or stop the first load 11.

[0040] Similarly, the third switching circuit 44 includes a third comparator 441 and a field-effect transistor M3. The second reference circuit 42 is connected to the non-inverting input terminal of the third comparator 441. The source of the field-effect transistor M3 is connected to the resistor 13 and the negative 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. 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 this reference with the reference voltage generated by the second reference circuit 42 to determine whether to turn on or off the field-effect transistor M3 to start or stop the second load 12.

[0041] In this embodiment, 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. When the voltage is high, 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.

[0042] The constant current drive circuit 200 may further include a drive module 5 to supply power to the load module 1 to drive the load module 1 to operate. 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.

[0043] In this embodiment, 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.

[0044] In general, the technical solution of the present application includes four circuits, namely the charging circuit of the electrolytic capacitor E1, the discharging circuit of the electrolytic capacitor E1, the working circuit of the first load 11, and the working circuits of the first load 11 and the second load 12. 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.

[0045] Specifically, in the charging circuit of the electrolytic capacitor E1, 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, so that a voltage difference appears on the resistor R1, and the field effect tube M1 is controlled to be connected or disconnected through the first compensation circuit 31, the first reference circuit 32 and the first comparator 33. The negative electrode of the electrolytic capacitor E1 is set through the field effect tube M1, the resistor R3 and the ground, so that the electrolytic capacitor E1 can form a complete circuit, thereby realizing the charging of the electrolytic capacitor E1.

[0046] In the discharge circuit of the electrolytic capacitor, 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, so as 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.

[0047] In the working loop of the first load 11, the current output by the rectifier bridge 51 flows to the resistor R2 and the first load 11 respectively. 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. At this time, 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.

[0048] In the working loop of the first load 11 and the second load 12, 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 is then grounded to form the working loop of the first load 11 and the second load 12.

[0049] Please refer to Figures 1 and 2. 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. 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.

[0050] Specifically, resistor R1 is connected to pin VT1 of chip 6, resistor R3 is connected to pin CS of chip 6, one end of energy storage module 2 is connected to the output end of driver module 5, and the other end is connected to pin CH of chip 6. The first compensation circuit 31, first reference circuit 32, first comparator 33, and field effect transistor M1 in rectifier module 3 are all integrated into chip 6. One end of first compensation circuit 31 is connected to pin VT1 of chip 6, and the other end is connected to first reference circuit 32. First reference circuit 32 is connected to the positive phase input of first comparator 33. First comparator 33 is connected to the gate of field effect transistor M1. The source of field effect transistor M1 is connected to the negative phase input of first comparator 33 and pin CS of chip 6. The drain of field effect transistor M1 is connected to pin CH of chip 6.

[0051] Specifically, the rectifier module 3 also includes a first power supply circuit 34 and a first protector 35 provided within the chip 6. 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 within the chip 6 and connected to the first reference circuit 32 to prevent damage to the chip 6 due to excessive temperature. Preferably, a GND terminal is provided within the chip 6, and the resistor R3 is connected to the CS pin and the GND terminal of the chip 6 to achieve grounding of the resistor R3.

[0052] 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, and 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 respectively connected to the filter capacitor C1 and the pin VT2 of the chip 6.

[0053] The second compensation circuit 41, the second reference circuit 42 and the second switching 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 connected to the positive inputs of the second comparator 431 and the third comparator 441 respectively. 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 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 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.

[0054] Specifically, the start-stop module 4 further includes a second power supply circuit 46 and a second protector 45 disposed within the chip 6. 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 disposed within the chip 6 and connected to the second reference circuit 42 to prevent damage to the chip 6 due to excessive temperature.

[0055] The driver module 5 includes a rectifier bridge 51 and a diode D1 connected to the power grid. The output of the rectifier bridge 51 is connected to the output of the diode D1, which is connected to the resistor R2, the energy storage module 2, and the load module 1. By providing diode D1, the current in the rectifier bridge 51 can flow through diode D1 and then to the energy storage module 2 and load module 1. However, when the energy storage module 2 is discharging, the current cannot flow through diode D1 to the rectifier bridge 51.

[0056] 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, and the second load 12 is a second light string. 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 AC power of the wire network into DC power to supply power to the constant current drive circuit 200. Of course, in other embodiments, the circuit board can be provided with a constant current control system 100, and by integrating part of the structure in the constant current drive circuit 200 on the chip 6, the integration of the circuit board can be improved, thereby reducing the cost of the circuit board. This is not limited here.

[0057] In this embodiment, the lamps include but are not limited to downlights, bulbs, light-emitting modules, ceiling lamps, street lamps, mining lamps, etc. Of course, in other embodiments, 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.

[0058] To sum up, 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 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.

[0059] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A constant current drive circuit, wherein: include: Load module (1); A start-stop module (4) connected to the output end of the load module (1) to control the start and stop of the load module (1); An energy storage module (2) is connected to the input end of the load module (1) so as to be charged when a high voltage is input to the load module (1) and to be discharged when a low voltage is input to the load module (1); A rectifier module (3) connected to the output end of the energy storage module (2) to control the angle and magnitude of the current flowing through the energy storage module (2); 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; 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 input end of the first reference circuit (32); 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 transistor M1; the drain of the field effect transistor M1 is connected to the energy storage module (2); the source of the field effect transistor 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.

2. The constant current driving 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, 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, so as to change the current angle of the electrolytic capacitor E1 during charging and discharging.

3. The constant current driving circuit according to claim 1, wherein: The rectifier module (3) also includes a temperature protector connected to the first reference circuit (32).

4. The constant current driving 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 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 respectively connected to the output ends of the first load (11) and the second load (12), and the output end of the resistor (13) is grounded.

5. The constant current driving 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); 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 input end of 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); The output end of the third switch circuit (44) is connected to the resistor (13) to control the start or stop of the second load (12); 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 respectively control the start or stop of the first load (11) and the second load (12).

6. The constant current driving 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 the positive phase input terminal of the second comparator (431); the source of the field effect transistor M2 is respectively connected to the resistor (13) and the negative phase input terminal of the second comparator (431); the drain of the field effect transistor M2 is connected to the output terminal of the first load (11); 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).

7. The constant current driving 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 the positive phase input terminal of the third comparator (441); the source of the field effect transistor M3 is respectively connected to the resistor (13) and the negative phase input terminal of the third comparator (441); the drain of the field effect transistor M3 is connected to the output terminal of the second load (12); 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).

8. A constant current control system, wherein: The invention comprises a driving module (5), a chip (6) and a constant current driving circuit (200) according to any one of claims 1 to 7, wherein a resistor R1 is connected to a pin VT1 of the chip (6), the resistor R3 is connected to a pin CS of the chip (6), one end of an energy storage module (2) is connected to an output end of the driving module (5), and the other end is connected to a pin CH of the chip (6), and a load module (1) comprises a first load (11), a second load (12) and a resistor (13), and the input end of the first load (11) is connected to the driving module ( The first load (11) is 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) comprises a resistor R2, the input end of the resistor R2 is connected to the output end of the drive module (5), and the output end of the resistor R2 is connected to the filter capacitor C1 and the pin VT2 of the chip (6).

9. The constant current control system according to claim 8, wherein: The driving module (5) comprises a rectifier bridge (51) and a diode D1 connected to a 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).

10. A lamp, wherein: A constant current drive circuit (200) as claimed in any one of claims 1 to 7, wherein the load module (1) is an LED lamp.

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