Constant-current driving circuit, constant-current control system and lamp

Abstract

The invention 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 of the load module, and the energy storage module can be charged when high voltage is input into the load module and can be discharged when 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 connected in sequence, the drain electrode and the source electrode of the field effect transistor M1 are connected with the energy storage module and a resistor R3 respectively, the output end of the resistor R3 is connected with the output end of the load module and is grounded, and the current peak value of the energy storage module is controlled through the resistor R3. According to the invention, the connection or disconnection time of the field effect transistor M1 is changed by adjusting the resistance value of the resistor R1, so that the phase angle of the electrolytic capacitor E1 is adjusted; the current peak value of the electrolytic capacitor E1 is adjusted by adjusting the resistance value of the resistor R3.

Description

Technical Field

[0001] The invention relates to a constant current driving circuit, a constant current control system and a lamp, and belongs to the technical field of integrated circuits. Background Art

[0002] With the release of the new national standard GB 17625.1-2022 "Electromagnetic Compatibility Limits-Part 1: Harmonic Current Emission Limits (Equipment Input Current per Phase ≤16A)", most of the lamps involving multi-stage high-voltage linear in lighting equipment do not meet the emission limit of rated power ≤25W. Although some products are designed with a single-stage high-voltage linear solution that meets the standards, single-stage high-voltage linear products will not work properly when the voltage is low or the voltage fluctuates greatly. Similarly, existing multi-stage high-voltage linear products also flicker or do not work when the voltage is low or the voltage fluctuates, and the existing multi-stage high-voltage linear products cannot meet the requirements of the new national standard for phase angle and THD (harmonic distortion rate).

[0003] In view of this, it is necessary to propose a constant current driving circuit, a constant current control system and a lamp to solve the above problems. Summary of the invention

[0004] The purpose of the present invention 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.

[0005] To achieve the above object, the present invention provides a constant current driving circuit, comprising:

[0006] Load module;

[0007] A start-stop module, connected to the output end of the load module to control the start and stop of the load module;

[0008] 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;

[0009] 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;

[0010] 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 current peak of the energy storage module through the resistor R3.

[0011] As a further improvement of the present invention, 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.

[0012] As a further improvement of the present invention, the rectifier module also includes a temperature protector connected to the first reference circuit.

[0013] As a further improvement of the present invention, 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.

[0014] As a further improvement of the present invention, 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, and 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.

[0015] As a further improvement of the present invention, 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.

[0016] As a further improvement of the present invention, 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.

[0017] To achieve the above-mentioned purpose, the present invention 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.

[0018] As a further improvement of the present invention, 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.

[0019] To achieve the above object, the present invention provides a lamp, applying the above constant current drive circuit, wherein the load module is an LED lamp.

[0020] The beneficial effects of the present invention are as follows: the constant current drive circuit of the present invention 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 regulated. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 4 is a circuit diagram of a drive control system according to a preferred embodiment of the present invention.

[0022] Figure 2 yes Figure 1 Internal circuit diagram of the chip.

[0023] Explanation of the accompanying drawings: 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. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] See also Figure 1 and Figure 2 As shown, the present invention discloses a constant current driving circuit 200, which is used to adjust the phase angle and peak value of the circuit output current, so that the constant current driving 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.

[0026] 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.

[0027] 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 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.

[0028] With such a 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. At the same time, 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. Specifically, 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.

[0029] 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 .

[0030] 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.

[0031] 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.

[0032] 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. By connecting the input end of the energy storage module 2 to the input end of the first load 11, 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. By setting the resistor 13, the current of the load module 1 can be controlled.

[0033] In the present embodiment, 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. Of course, in other embodiments, 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.

[0034] 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 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.

[0035] 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.

[0036] 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. Specifically, 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.

[0037] Similarly, 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] In general, the technical solution of the present invention 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. 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.

[0042] 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 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 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.

[0043] 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 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.

[0044] 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, 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. 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.

[0045] 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 then is grounded to form the working loop of the first load 11 and the second load 12.

[0046] See also Figure 1 and Figure 2As shown, the present invention 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.

[0047] Specifically, 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.

[0048] Specifically, 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. Preferably, 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.

[0049] 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, and 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.

[0050] 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.

[0051] Specifically, 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.

[0052] 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. By providing the diode D1, 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.

[0053] The present invention 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. Of course, in other embodiments, the circuit board can be set as a constant current control system 100, by integrating part of the structure in the constant current drive circuit 200 on the chip 6, so as to improve the integration of the circuit board, thereby reducing the cost of the circuit board, which is not limited here.

[0054] In this embodiment, the lamps include but are not limited to downlights, bulb lamps, 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.

[0055] To sum up, the constant current drive circuit 200 of the present invention adjusts the current peak value 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 value 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.

[0056] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A constant current driving circuit, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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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