A constant current drive control circuit and system

Abstract

A constant current drive control circuit and system, wherein a reference voltage circuit converts a high level value of a level signal into a reference voltage and outputs it to an operational amplifier circuit, and a bias enable circuit converts a high level value of a level signal into a first enable signal and outputs it to the operational amplifier circuit to drive it to work. When the operational amplifier circuit is working, after processing the reference voltage, it outputs a conduction signal to a switch circuit, so that the switch circuit is turned on and works, and accordingly controls an LED circuit to emit light, otherwise it is turned off and controls the LED circuit to stop emitting light. Therefore, the high level value of the level signal supplies power to the constant current drive control circuit, and the constant current drive control circuit completes signal processing and signal control when the level signal is in a high level state, and controls the LED circuit to realize constant current; when the level signal is a low level value, the constant current drive control circuit stops working, and the power consumption is zero, and the constant current drive control circuit and the LED circuit realize ultra-low power consumption during standby.

Description

Technical Field

[0001] The present invention belongs to the technical field of constant current drive, and in particular relates to a constant current drive control circuit and system. Background Art

[0002] With the popularity of LED lighting, smart lighting power supplies or lamps developed based on traditional LED power drive systems have gradually entered people's life applications. While smart lighting power supplies or lamps bring convenience to people, they still have certain disadvantages. At present, traditional LED power drive systems control the brightness, color temperature, scene changes, and on or off of lamps through various remote controls, mobile phone apps, or voice recognition and other third-party products. When the LED lamp is set to a dark state, the LED power drive system enters a standby state. At this time, the LED power drive system and / or the LED lamp are actually still in a powered state, consuming unnecessary power.

[0003] Therefore, in the conventional LED power driving technical solution, when the LED power driving system is in the standby state, the LED power driving system and / or the LED lamp is still in the powered state, thus wasting power. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a constant current drive control circuit and system, aiming to solve the problem in traditional LED power drive technology solutions that when the LED power drive system is in standby mode, the LED power drive system and / or the LED lamp are still in a powered state, wasting power consumption.

[0005] A first aspect of an embodiment of the present invention provides a constant current drive control circuit, comprising a dimming port and an output port, wherein the dimming port is used to receive a level signal, and the output port is externally connected to an LED circuit, and the constant current drive control circuit further comprises:

[0006] A reference voltage circuit is connected to the dimming port and is configured to receive a level signal and output a reference voltage after converting a high level value of the level signal;

[0007] A bias enabling circuit connected to the dimming port and configured to output a first enabling signal after converting a high level value of the level signal;

[0008] an operational amplifier circuit connected to the reference voltage circuit and the bias enable circuit, configured to operate upon receiving the first enable signal, and output a conduction signal after performing signal processing on the reference voltage; and

[0009] A switch circuit is connected to the operational amplifier circuit and the output port. The switch circuit is configured to be turned on when receiving the conduction signal and to control the LED circuit to emit light accordingly. Otherwise, the switch circuit is turned off and controls the LED circuit to stop emitting light, thereby realizing the use of the level signal to control the operation of the LED circuit and using the high level value of the level signal as the power supply signal without the need for an external power supply.

[0010] Furthermore, it also includes:

[0011] The power supply enabling circuit is connected to the dimming port, the output port and the operational amplifier circuit, and is configured to operate when receiving a high level value of the level signal, and convert the electrical signal at the output port into a second enabling signal, and transmit it to the operational amplifier circuit, so as to control the switching circuit to be turned on through the operational amplifier circuit and reduce the loss of the switching circuit.

[0012] Furthermore, the reference voltage circuit comprises:

[0013] a current limiting circuit connected to the dimming port, configured to convert the high level value of the level signal into the reference voltage and output it to the operational amplifier circuit, and perform current limiting protection; and

[0014] The clamping circuit is connected to the current limiting circuit and the operational amplifier circuit, and is configured to clamp the voltage value output by the current limiting circuit to the reference voltage.

[0015] Furthermore, it also includes:

[0016] The over-temperature protection circuit is connected to the clamping circuit and is configured to perform temperature monitoring and perform over-temperature protection when the temperature is greater than a preset threshold.

[0017] A second aspect of the embodiments of the present invention provides:

[0018] A control circuit, configured to output or stop outputting a level signal according to a control instruction, wherein the level signal has a high level value and a low level value;

[0019] The constant current drive control circuit according to any one of claims 1 to 4, wherein the constant current drive control circuit is connected to the control circuit and the LED circuit, and is configured to drive the LED circuit to receive a constant current and work according to the level signal; and is configured to stop working when the level signal is not received; and

[0020] The first current limiting component is connected to the output current setting port of the constant current drive control circuit and is configured to control the value of the constant current.

[0021] Furthermore, it also includes:

[0022] A rectifier circuit is connected to the LED circuit and configured to rectify the AC signal into a first DC signal and output the first DC signal to the LED circuit.

[0023] Furthermore, it also includes:

[0024] A voltage conversion circuit connected to the rectifier circuit and the control circuit and configured to convert the first DC signal into a second DC signal and output the second DC signal to the control circuit.

[0025] Furthermore, it also includes:

[0026] The human-computer interaction component is connected to the control circuit and is configured to send the control instruction to the control circuit to control the control circuit to execute the instruction accordingly.

[0027] Furthermore, the human-computer interaction component performs wireless or wired communication with the constant current drive control circuit.

[0028] The above-mentioned constant current drive control circuit, system and method utilize the high level value of the level signal to power the constant current drive control circuit. When the level signal is in a high level state, the constant current drive control circuit completes signal processing and signal control, and controls the LED circuit to achieve constant current. When the level signal is a low level value, the constant current drive control circuit stops working, and the power consumption is zero. The constant current drive control circuit and the LED circuit achieve ultra-low power consumption during standby. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 A structural schematic diagram of a constant current drive control circuit provided by one embodiment of the present invention;

[0031] Figure 2 A structural schematic diagram of a constant current drive control circuit provided by another embodiment of the present invention;

[0032] Figure 3 for Figure 1 An example circuit schematic diagram of a constant current drive control circuit is shown;

[0033] Figure 4 for Figure 2 An example circuit schematic diagram of a constant current drive control circuit is shown;

[0034] Figure 5 A structural schematic diagram of a constant current drive control system provided by one embodiment of the present invention;

[0035] Figure 6 A structural schematic diagram of a constant current drive control system provided by another embodiment of the present invention;

[0036] Figure 7 A structural schematic diagram of a constant current drive control system provided by yet another embodiment of the present invention;

[0037] Figure 8 for Figure 5 , 6 Or the example circuit schematic diagram of the constant current drive control system shown in 7;

[0038] Fig. 9 for Figure 5 , 6 Or another exemplary circuit schematic diagram of the constant current drive control system shown in 7;

[0039] Fig.10 This is the corresponding relationship diagram between the working current and the level signal of the LED circuit. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0041] The present invention aims to provide a constant current drive control circuit 10 and system, so that it can achieve the effect of working without an external power supply. The connected level signal has both driving function and power supply function. The level signal controls the operation of the LED circuit 100. When the level signal is a high level value, the high level value of the level signal is converted into a reference voltage Vref and a first enable signal, the constant current drive control circuit 10 is powered on and the LED circuit 100 emits light. When the level signal is a low level value, the constant current drive control circuit 10 stops working, the LED circuit 100 stops emitting light, the power consumption is zero, and the constant current drive control circuit 10 and the LED circuit 100 achieve ultra-low power consumption during standby.

[0042] See also Figure 1 , is a structural diagram of a constant current drive control circuit 10 provided in one embodiment of the present invention. For the sake of convenience, only the part related to this embodiment is shown, which is described in detail as follows:

[0043] A constant current drive control circuit 10 includes a dimming port DIM and an output port OUT, wherein the dimming port DIM is used to receive a level signal, and the output port OUT is externally connected to an LED circuit 100. The constant current drive control circuit 10 also includes a reference voltage Vref circuit 101, a bias voltage circuit, a bias enable circuit 102, an operational amplifier circuit 103, and a switch circuit 104.

[0044] Specifically, the LED circuit 100 is composed of one LED lamp, or multiple LED lamps connected in series or in parallel. The LED circuit 100 is controlled by a constant current drive control circuit 10, which is controlled by a level signal and uses the high level value of the level signal as working power.

[0045] The reference voltage Vref circuit 101 and the bias enabling circuit 102 are respectively connected to the dimming port DIM, the operational amplifier circuit 103 is connected to the reference voltage Vref circuit 101 and the bias enabling circuit 102 , and the switch circuit 104 is connected to the operational amplifier circuit 103 and the output port OUT.

[0046] The reference voltage Vref circuit 101 is configured to receive a level signal, convert a high level value of the level signal, and then output a reference voltage Vref.

[0047] The bias enabling circuit 102 is configured to output a first enabling signal after converting the high level value of the level signal.

[0048] The operational amplifier circuit 103 is configured to operate upon receiving the first enable signal, and output a conduction signal after performing signal processing on the reference voltage Vref.

[0049] The switch circuit 104 is configured to be turned on when receiving a turn-on signal, and to control the LED circuit 100 to emit light accordingly, otherwise it is turned off and controls the LED circuit 100 to stop emitting light, thereby realizing the use of a level signal to control the operation of the LED circuit 100, and using the high level value of the level signal as a power supply signal, without the need for an external power supply.

[0050] Specifically, when the bias enable circuit 102 outputs the first enable signal, the operational amplifier circuit 103 can work. The operational amplifier circuit 103 is used to output a conduction signal after performing signal processing on the reference voltage Vref. The conduction signal is transmitted to the controlled end of the switch circuit 104, so that the switch circuit 104 is turned on and works; after the switch circuit 104 is turned on, the LED circuit 100 works, and the voltage value of the LED circuit 100 when working is basically equal to the value of the reference voltage Vref.

[0051] When the low level value of the level signal is input to the dimming port DIM of the constant current drive control circuit 10, since the constant current drive control circuit 10 has no external power supply port and is not connected to other power supplies, the constant current drive control circuit 10 is in a stopped state at this time. The constant current drive control circuit 10 does not consume energy and is in an ultra-low power standby state. The constant current drive control circuit 10 receives power through the level signal input from the dimming port DIM, and drives the LED circuit 100 to work accordingly, without the need for an external power supply port such as VIN or VDD, and without any form of external separate power supply circuit or power supply, signal processing and signal control can be completed, and the LED circuit 100 can be controlled to achieve constant current.

[0052] The constant current drive control circuit 10 can be used to control a single LED circuit 100 for dimming, or to control a dual LED circuit 100 for color adjustment, or to control multiple colored lights and other intelligent lighting fixtures or products for dimming and / or color adjustment.

[0053] See also Figure 2 , is a structural schematic diagram of a constant current drive control circuit 10 provided by another embodiment of the present invention. For the sake of convenience, only the part related to this embodiment is shown, which is described in detail as follows:

[0054] In an optional embodiment, the above-mentioned constant current drive control circuit 10 further includes a power supply enabling circuit 105 .

[0055] The power enabling circuit 105 is connected to the dimming port DIM, the output port OUT and the operational amplifier circuit 103 .

[0056] The power supply enabling circuit 105 is configured to operate when receiving a high level value of a level signal, and convert the electrical signal at the output port OUT into a second enabling signal, and transmit it to the operational amplifier circuit 103, so as to control the switch circuit 104 to be turned on through the operational amplifier circuit 103, and reduce the loss of the switch circuit 104.

[0057] Specifically, the electrical signal at the output port OUT is greater than the high level value of the level signal. Figure 1 Compared with the embodiment shown, the advantage of this embodiment is that the power supply enabling circuit 105 converts the electrical signal at the output port OUT into a second enabling signal and transmits it to the operational amplifier circuit 103 to power the operational amplifier circuit 103, so that the conduction signal output by the operational amplifier circuit 103 to the switch circuit 104 is increased, so that the switch circuit 104 operates in a saturation state, the on-resistance of the switch circuit 104 is reduced, and the loss when the switch circuit 104 is turned on is reduced.

[0058] In an optional embodiment, the reference voltage Vref circuit 101 includes a current limiting circuit and a clamping circuit.

[0059] The current limiting circuit is connected to the dimming port DIM, and the clamping circuit is connected to the current limiting circuit and the operational amplifier circuit 103 .

[0060] The current limiting circuit is configured to convert the high level value of the level signal into a reference voltage Vref and output it to the operational amplifier circuit 103 , and perform current limiting protection.

[0061] The clamp circuit is configured to clamp the voltage value output by the current limiting circuit to a reference voltage Vref.

[0062] In other embodiments, the reference voltage Vref circuit 101 may also be formed by other related integrated circuit modules having the function of generating the reference voltage Vref.

[0063] Optionally, the above-mentioned constant current drive control circuit 10 also includes an over-temperature protection circuit.

[0064] The over-temperature protection circuit is connected to the clamping circuit.

[0065] The over-temperature protection circuit is configured to monitor the temperature and perform over-temperature protection when the temperature is greater than a preset threshold. By setting the over-temperature protection circuit, the safety of the circuit is increased to avoid high temperature from damaging circuit components or even causing safety accidents. When the operating temperature of the constant current drive control circuit 10 is too high, the over-temperature protection circuit promptly adjusts the parameter size of the reference voltage Vref.

[0066] See also Figure 3 ,for Figure 1 The exemplary circuit schematic diagram of the constant current drive control circuit 10 shown in the figure only shows the part related to the present embodiment for the convenience of explanation, which is described in detail as follows:

[0067] In an optional embodiment, the current limiting circuit includes a resistor R1, and the clamping circuit includes a clamping diode D1.

[0068] In an optional embodiment, the operational amplifier circuit 103 is implemented by an operational amplifier INV1, the switch circuit 104 is implemented by an NMOS transistor Q1, and the bias enabling circuit 102 is implemented by a current source.

[0069] The first end of the resistor R1 and the input end of the current source are both connected to the dimming port DIM, the second end of the resistor R1, the cathode of the clamping diode D1 and the non-inverting input end of the operational amplifier INV1 are connected in common; the inverting input end of the operational amplifier INV1 is connected to the source of the NMOS transistor Q1, the output end of the operational amplifier INV1 is connected to the gate of the NMOS transistor Q1, and the gate of the NMOS transistor Q1 is the controlled end of the switch circuit 104; the drain of the NMOS transistor Q1 is connected to the output port OUT.

[0070] Depend on Figure 3 It can be seen that the constant current drive control circuit 10 further includes a ground port GND and an output current setting port REXT, the anode of the clamping diode D1 is connected to the ground port GND, and the source of the NMOS tube Q1 is connected to the output current setting port REXT.

[0071] Specifically, the output port OUT is externally connected to the LED circuit 100, and when the constant current drive control circuit 10 receives a high level value of the level signal, the gate of the NMOS tube Q1 receives a conduction signal, the LED circuit 100, the drain of the NMOS tube Q1, the source of the NMOS tube Q1 and the current setting port are connected, and the LED circuit 100 emits light.

[0072] Specifically, the level signal enters the dimming port DIM, and passes through the reference voltage Vref circuit 101 composed of the resistor R1 and the clamping diode D1. When the high level value of the level signal is input into the dimming port DIM, a fixed reference voltage Vref is generated. The high level value of the level signal is input into the dimming port DIM, and a fixed bias current is generated through the constant current source and provided to the operational amplifier INV1. This bias current also serves as the power supply of the operational amplifier INV1. The operational amplifier INV1 is normally turned on and works at this time. The operational amplifier INV1 forms a constant current control circuit for the NMOS tube Q1. The source of the NMOS tube Q1 is connected to the first current limiting component Z1 described below through the output current setting port REXT. The output current setting port REXT is also connected to the inverting input terminal of the operational amplifier INV1. It can be seen that the voltage value at the output current setting port REXT is equal to the voltage value at the positive input terminal voltage of the operational amplifier INV1, that is, equal to the voltage value of the reference voltage Vref.

[0073] Optionally, the constant current drive control circuit 10 can be packaged as a constant current drive chip IC1, which has a dimming pin, an output pin, a ground pin and a current setting pin. The dimming pin, the output pin, the ground pin and the current setting pin correspond to the connection points of the dimming port DIM, the output port OUT, the ground port GND and the current setting port, respectively, and are connected to external components or circuits; the reference voltage Vref circuit 101, the bias voltage circuit, the bias enable circuit 102, the operational amplifier circuit 103 and the switch circuit 104 are circuit modules inside the constant current drive chip IC1.

[0074] The above-mentioned constant current driver chip IC1 does not need to set power pins such as VIN or VDD, and does not need an external power supply or power supply circuit. It only uses the level signal input by the dimming port DIM as the driving signal and the power supply signal, and uses the high level value of the level signal for power supply. When the level signal is in a high level state, signal processing and signal control are completed, and the LED circuit 100 is controlled to achieve constant current; when the level signal is a low level value, it stops working, and the power consumption is zero. The constant current drive control circuit 10 and the LED circuit 100 achieve ultra-low power consumption during standby.

[0075] See also Figure 4 ,for Figure 2 The exemplary circuit schematic diagram of the constant current drive control circuit 10 shown in the figure only shows the part related to the present embodiment for the convenience of explanation, which is described in detail as follows:

[0076] In an optional embodiment, the power supply enabling circuit 105 is connected to the dimming port DIM and the output port OUT. When the dimming port DIM inputs a high level value of the level signal, the power supply enabling circuit 105 starts to work, and converts the electrical signal received from the output port OUT into a second enable signal and transmits it to the operational amplifier INV1 to power the operational amplifier INV1. In addition, the high level value of the level signal is input to the operational amplifier INV1 through the current source, so that the operational amplifier INV1 starts to work. The electrical signal received by the output port OUT is greater than the high level value of the level signal, and the operational amplifier INV1 controls the gate voltage V_gate of the NMOS tube Q1 to be equal to the electrical signal received by the output port OUT. The VCC voltage is greater than the NMOS tube driving saturation voltage, which reduces the resistance value of the on-resistance of the NMOS tube Q1 and reduces the loss of the NMOS tube Q1.

[0077] Depend on Figure 4 It can be seen that when the level signal is a high level value, the power supply enable circuit 105 works, and the drain voltage of the NMOS tube Q1 enters the power supply enable circuit 105. The power supply enable circuit 105 can be composed of a JFET (Junction Field-EffectTransistor) power device or other related integrated circuits that generate a fixed voltage. The power supply enable circuit 105 generates a second enable signal and outputs it to the operational amplifier INV1 to power the operational amplifier INV1. The operational amplifier INV1 controls the gate voltage V_gate of the NMOS tube Q1 to be equal to the voltage value of the second enable signal. The voltage value of the second enable signal is greater than the saturation voltage of the NMOS tube Q1, which reduces the resistance of the on-resistance of the NMOS tube Q1 and reduces the loss of the NMOS tube Q1.

[0078] In this embodiment, the high level of the level signal is used as the first enable signal to control the operational amplifier INV1 to work, and as the second enable signal to control the power supply enable circuit 105 to work on the NMOS tube Q1. When the level signal is low, the NMOS tube Q1 and the operational amplifier INV1 are turned off at the same time, the power consumption of the entire constant current drive control circuit 10 is close to zero, and the constant current drive control circuit 10 and the LED circuit 100 enter the standby state, and are in an ultra-low power consumption state when in standby.

[0079] See also Figure 5 , is a structural schematic diagram of a constant current drive control system provided by an embodiment of the present invention. For the sake of convenience, only the part related to this embodiment is shown, which is described in detail as follows:

[0080] A constant current drive control system comprises a control circuit, the above-mentioned constant current drive control circuit 10 and a first current limiting component Z1.

[0081] The control circuit is connected to the constant current drive control circuit 10 , and the constant current drive control circuit 10 is connected to the LED circuit 100 and the first component.

[0082] The control circuit is configured to output or stop outputting a level signal according to a control instruction Ctrl, and the level signal has a high level value and a low level value.

[0083] The constant current driving control circuit 10 is configured to drive the LED circuit 100 to receive a constant current and work according to a level signal; and is configured to stop working when not receiving a level signal.

[0084] The first current limiting component Z1 is configured to control the value of the constant current.

[0085] Specifically, the level signal is a PWM signal (Pulse width modulation, pulse width adjustable signal) or a PFM signal (Pulse frequency modulation, pulse frequency modulation signal). The following description takes the level signal as a PWM signal as an example. Fig.10 , you can set the duty cycle of the PWM signal according to actual work needs. The duty cycle can be set to 75%, 50% or 25%, or other values. Fig.10 Optionally, the current waveform output by the constant current drive control circuit 10 has the same phase as the waveform of the PWM signal output by the control circuit; the current output by the constant current drive control circuit 10 is the operating current of the LED circuit 100.

[0086] When the PWM signal enters the dimming port DIM and is at a high level, the reference voltage Vref circuit 101 generates a reference voltage Vref, the operational amplifier INV1 works normally, the NMOS tube Q1 is turned on, the voltage at the output current setting port REXT is the reference voltage Vref, and the LED circuit 100 connected in series with the NMOS tube Q1 is turned on, wherein the current flowing through the LED circuit 100 is a fixed value, and the current on the LED light string is: Where V REXT When the low level of the PWM signal enters the dimming port DIM, the reference voltage Vref circuit 101 cannot establish the reference voltage Vref due to the voltage value of zero, and the low level value of the PWM signal cannot generate a bias current through the constant current source, so the operational amplifier INV1 and the NMOS tube Q1 cannot start working normally, and the LED circuit 100 cannot be turned on and work, and the current consumed by the constant current drive control circuit 10 is at the microampere level or even lower, and it and the LED circuit 100 achieve ultra-low energy consumption standby together.

[0087] In an optional embodiment, the first current limiting component Z1 is implemented by a resistor R2.

[0088] See also Figure 6 , is a structural diagram of a constant current drive control system provided by another embodiment of the present invention. For the sake of convenience, only the part related to this embodiment is shown, which is described in detail as follows:

[0089] In an optional embodiment, the above constant current drive control system further includes a rectifier circuit 40 ; and may also include a voltage conversion circuit 30 .

[0090] The rectifier circuit 40 is connected to the LED circuit 100 , and the voltage conversion circuit 30 is connected to the rectifier circuit 40 and the control circuit.

[0091] The rectifying circuit 40 is configured to rectify the AC power signal into a first DC power signal and output the signal to the LED circuit 100. The voltage converting circuit 30 is configured to convert the first DC power signal into a second DC power signal and output the signal to the control circuit.

[0092] Specifically, the first DC signal is a pulsating DC signal, the AC signal can be 220V AC, or AC generated by other AC power sources. The second DC signal powers the control circuit, so that the control circuit can generate a PWM signal with a specific duty cycle when working.

[0093] The 220V AC mains electricity forms a pulsating DC signal after passing through the rectifier circuit 40. The pulsating DC signal enters the LED circuit 100 through one branch and enters the voltage conversion circuit 30 through another branch. The voltage conversion circuit 30 converts the pulsating DC signal into a second DC signal with a fixed voltage and provides it to the control circuit. When the control circuit is working, it provides a fixed PWM signal to the constant current drive control circuit 10. The constant current drive control circuit 10 does not need a separate power supply outside. The LED circuit 100 and the switch circuit 104 in the constant current drive control circuit 10 are in series.

[0094] See also Figure 7 , is a structural schematic diagram of a constant current drive control system provided by another embodiment of the present invention. For the sake of convenience, only the parts related to this embodiment are shown, which are described in detail as follows:

[0095] In an optional embodiment, the above-mentioned constant current drive control system also includes a human-computer interaction component 50.

[0096] The human-computer interaction component 50 is connected to the control circuit and is configured to send a control instruction Ctrl to the control circuit to control the control circuit to execute the instruction accordingly.

[0097] In an optional embodiment, the human-machine interaction component 50 performs wireless communication or wired communication with the constant current drive control circuit 10. Specifically, the wireless communication method includes but is not limited to Bluetooth, WIFI or microwave radar induction, and the wired communication includes but is not limited to USB connection communication.

[0098] Specifically, the human-computer interaction component 50 is used by the user, and the user can input the control command Ctrl and output the control command Ctrl. The control command Ctrl includes but is not limited to a standby command and a working command. When the standby command is output, the control circuit stops outputting the PWM signal, the constant current drive control circuit 10 enters the standby state, and achieves ultra-low power consumption during the standby period. When the working command is output, the control circuit works, outputs a PWM signal with a specific duty cycle to the dimming port DIM, the constant current drive control circuit 10 works, and the LED circuit 100 emits light.

[0099] See also Figure 8 ,for Figure 5 , 6 Or the example circuit schematic diagram of the constant current drive control system shown in 7, for the convenience of explanation, only the part related to this embodiment is shown, which is detailed as follows:

[0100] In an optional embodiment, the rectifier circuit 40 includes a rectifier bridge DB1 , a resistor R10 , a resistor R30 , and a filter capacitor E10 . Figure 8The constant current drive control circuit 10 shown is implemented by a packaged constant current drive chip IC1.

[0101] The resistor R10 is connected in series to the live wire of the AC mains, the first input terminal of the rectifier bridge DB1 is connected to the live wire through the resistor R10, and the second input terminal is connected to the neutral wire. The potential difference between the live wire and the neutral wire is 220 V. The first output terminal of the rectifier bridge DB1 is connected to the LED circuit 100, the resistor R30 and the filter capacitor E10 are connected in parallel between the first output terminal and the second output terminal of the rectifier bridge DB1, and the second output terminal of the rectifier bridge DB1 is grounded.

[0102] Depend on Figure 8 It can be seen that the LED circuit 100 can be implemented by using a single-channel series LED lamp, the input end of the LED lamp string is connected to the rectifier circuit 40, and the output end of the LED lamp string is connected to the output pin of the constant current driving chip IC1.

[0103] The AC power is rectified and filtered by the rectifier circuit 40 to form a pulsating DC signal. The pulsating DC signal passes through the LED light string and enters the output pin of the constant current driver chip IC1 for constant current. The other branch of the pulsating DC signal enters the voltage conversion circuit 30, and the voltage conversion circuit 30 outputs the working voltage required by the control circuit. When the control circuit is working, it outputs a fixed PWM signal. This PWM signal enters the internal circuit through the dimming pin of the constant current driver chip IC1. The integrated circuit structure inside the constant current driver chip IC1 has been Figures 1 to 4 The output current setting pin of the constant current driving chip IC1 is externally connected to the first current limiting component Z1, and the first current limiting component Z1 is grounded. In this embodiment, the first current limiting component Z1 is implemented by a resistor R2.

[0104] The control circuit generates a PWM signal. When the high level of the PWM signal enters the dimming port DIM of the constant current driver chip IC1, the constant current driver chip IC1 uses this high level value as the power supply inside the chip IC1 and the energy source required by the related control circuit. At this time, the constant current driver chip IC1 can work normally, and the output port OUT can output a fixed current I OUT , Control the LED light string to provide constant current. OUT The phase relationship with the PWM signal is as follows Fig.10 .

[0105] See also Fig. 9 ,for Figure 5 , 6 Another exemplary circuit schematic diagram of the constant current drive control system shown in FIG. 7, for the sake of convenience of explanation, only the part related to this embodiment is shown, which is described in detail as follows:

[0106] Fig. 9The constant current drive control circuit 10 shown is implemented by a packaged constant current drive chip IC1.

[0107] The AC power is rectified and filtered by the rectifier circuit 40 to become a pulsed DC signal. The pulsed DC signal passes through two strings of LED lights with different color temperatures and enters the first output port OUT1 and the second output port OUT2 of the constant current driver chip IC1 for constant current. The pulsed DC signal enters the voltage conversion circuit 30 from another branch and outputs the working voltage required by the control circuit. The control circuit outputs two fixed PWM signals, which enter the constant current driver chip IC1. The integrated circuit structure inside the constant current driver chip IC1 has been Figures 1 to 4 The first output current setting port REXT1 and the second output current setting port REXT2 of the constant current driving chip IC1 are connected to a resistor R2 and a resistor R3 respectively.

[0108] The two PWM signals generated by the control circuit are used to control the two LED light strings with different color temperatures to turn on and off, thereby realizing color temperature control. When the high level of the PWM signal enters the two dimming ports DIM of the constant current driver chip IC1, the constant current driver chip IC1 uses this high level value as the power supply inside the chip IC1 and the energy source required by the related control circuit. At this time, the constant current driver chip IC1 can work normally, and the two output ports OUT can output two fixed currents respectively to control the two LED light strings to perform constant current.

[0109] The current on LED string 1 is:

[0110] The current on LED string 2 is:

[0111] Among them, Vreft1 and Vreft2 are two reference voltages Vref inside the LED constant current driver chip IC1. When the low level of the PWM control signal enters the DIM port of the constant current driver chip IC1, since the constant current driver chip IC1 has no power supply pin, the constant current driver chip IC1 stops working and does not consume energy.

[0112] When the human-machine interaction component 50 sends a standby instruction to the control circuit, the two PWM signals output by the control circuit are zero-level signals, and the constant current driving chip IC1 enters the standby mode and is in an ultra-low power consumption state.

[0113] based on Figure 8 and Fig. 9By analyzing the application of the constant current drive control system in single-channel dimming and dual-channel color adjustment respectively, it can be deduced that the constant current drive control system provided by the present invention is also used to make a constant current drive chip IC1 with multi-channel input and multi-channel output, and is applied to multi-channel LED light strings.

[0114] In summary, the present application provides a constant current drive control circuit and system, wherein the reference voltage circuit converts the high level value of the level signal into a reference voltage and outputs it to the operational amplifier circuit, and the bias enable circuit converts the high level value of the level signal into an output first enable signal and outputs it to the operational amplifier circuit to drive it to work. When the operational amplifier circuit is working, after processing the reference voltage, it outputs a conduction signal to the switch circuit to turn on the switch circuit and control the LED circuit to emit light accordingly, otherwise it turns off and controls the LED circuit to stop emitting light. Therefore, the high level value of the level signal powers the constant current drive control circuit, and the constant current drive control circuit completes signal processing and signal control when the level signal is in a high level state, and controls the LED circuit to achieve constant current; when the level signal is a low level value, the constant current drive control circuit stops working, and the power consumption is zero, and the constant current drive control circuit and the LED circuit achieve ultra-low power consumption during standby.

[0115] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A constant current drive control circuit, comprising a dimming port and an output port, wherein the dimming port is used to receive a level signal, and the output port is externally connected to an LED circuit, characterized in that: The constant current drive control circuit also includes: A reference voltage circuit is connected to the dimming port and is configured to receive a level signal and output a reference voltage after converting a high level value of the level signal; A bias enabling circuit connected to the dimming port and configured to output a first enabling signal after converting a high level value of the level signal; an operational amplifier circuit connected to the reference voltage circuit and the bias enable circuit, configured to operate upon receiving the first enable signal, and output a conduction signal after performing signal processing on the reference voltage; and a switch circuit connected to the operational amplifier circuit and the output port, wherein the switch circuit is configured to be turned on when receiving the conduction signal, and to control the LED circuit to emit light accordingly, otherwise it is turned off and controls the LED circuit to stop emitting light, thereby realizing the use of the level signal to control the operation of the LED circuit, and using the high level value of the level signal as the power supply signal of the constant current drive control circuit, without the need for an external power supply; The level signal is a PWM signal or a PFM signal.

2. The constant current drive control circuit according to claim 1, characterized in that: Also includes: The power supply enabling circuit is connected to the dimming port, the output port and the operational amplifier circuit, and is configured to operate when receiving a high level value of the level signal, and convert the electrical signal at the output port into a second enabling signal, and transmit it to the operational amplifier circuit, so as to control the switching circuit to be turned on through the operational amplifier circuit and reduce the loss of the switching circuit.

3. The constant current drive control circuit according to claim 1, characterized in that: The reference voltage circuit comprises: a current limiting circuit connected to the dimming port, configured to convert the high level value of the level signal into the reference voltage and output it to the operational amplifier circuit, and perform current limiting protection; and The clamping circuit is connected to the current limiting circuit and the operational amplifier circuit, and is configured to clamp the voltage value output by the current limiting circuit to the reference voltage.

4. The constant current drive control circuit according to claim 3, characterized in that: Also includes: The over-temperature protection circuit is connected to the clamping circuit and is configured to perform temperature monitoring and perform over-temperature protection when the temperature is greater than a preset threshold.

5. A constant current drive control system, characterized in that: include: A control circuit, configured to output or stop outputting a level signal according to a control instruction, wherein the level signal has a high level value and a low level value; The constant current drive control circuit according to any one of claims 1 to 4, wherein the constant current drive control circuit is connected to the control circuit and the LED circuit, and is configured to drive the LED circuit to receive a constant current and operate according to the level signal; and is configured to stop working when not receiving the level signal; as well as The first current limiting component is connected to the output current setting port of the constant current drive control circuit and is configured to control the value of the constant current.

6. The constant current drive control system according to claim 5, characterized in that: Also includes: A rectifier circuit is connected to the LED circuit and configured to rectify the AC signal into a first DC signal and output the first DC signal to the LED circuit.

7. The constant current drive control system according to claim 6, characterized in that: Also includes: A voltage conversion circuit connected to the rectifier circuit and the control circuit and configured to convert the first DC signal into a second DC signal and output the second DC signal to the control circuit.

8. The constant current drive control system according to claim 5, characterized in that it also includes: The human-computer interaction component is connected to the control circuit and is configured to send the control instruction to the control circuit to control the control circuit to execute the instruction accordingly.

9. The constant current drive control system according to claim 8, characterized in that: The human-computer interaction component performs wireless or wired communication with the constant current drive control circuit.

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