CN114126147A - LED constant-current constant-power driving circuit and LED lighting device - Google Patents
LED constant-current constant-power driving circuit and LED lighting device Download PDFInfo
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Abstract
The invention provides an LED constant-current constant-power driving circuit and an LED lighting device, wherein the LED constant-current constant-power driving circuit comprises a signal sampling module, a constant-current driving module, a reference voltage control module and a constant-power adjusting module; the input end of the signal sampling module is connected with a power supply, the output end of the signal sampling module is respectively connected with the input end of the reference voltage control module and the first input end of the constant current driving module, the constant power adjusting module is connected between the output end of the signal sampling module and the first input end of the constant current driving module, the second input end of the constant current driving module is connected with the output end of the reference voltage control module, and the output end of the constant current driving module is connected with the LED light-emitting module; the reference voltage control module is used for receiving the voltage signal collected by the signal sampling module, and controlling the voltage of the second input end of the constant current driving module to be at a preset voltage value based on the voltage signal, so that the current flowing through the LED light-emitting module is stably increased to a constant current value, and the overshoot phenomenon cannot be generated.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to an LED constant-current constant-power driving circuit and an LED lighting device.
Background
The output voltage overshoot refers to a phenomenon that the output voltage is higher than the steady-state voltage in a transient state when the output voltage is established in the process that the power supply is electrified on the input source. If the overshoot amplitude is large and the overshoot time is long, the tolerance limit of the electric equipment is exceeded, and the electric equipment can be damaged.
For example, in the field of LED lighting constant current driving, linear constant current driving has the advantages of simple control, convenient production, and the like, and is widely applied, but in the instant of starting up, an output current of an existing LED constant current constant power driving circuit generates an overshoot phenomenon, which causes damage or breakdown of an LED lamp, damages a lighting device, and reduces the service life of the lighting device.
Disclosure of Invention
The invention aims to provide an LED constant-current constant-power driving circuit and an LED lighting device, and aims to solve the problem that an LED lamp is damaged or broken down due to the fact that output current of the existing LED constant-current constant-power driving circuit overshoots at the moment of starting.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides an LED constant-current constant-power driving circuit, which is used for driving an LED light-emitting module and comprises a signal sampling module, a constant-current driving module, a reference voltage control module and a constant-power regulating module; wherein,
the input end of the signal sampling module is connected with a power supply, the output end of the signal sampling module is respectively connected with the input end of the reference voltage control module and the first input end of the constant current driving module, the constant power adjusting module is connected between the output end of the signal sampling module and the first input end of the constant current driving module, the second input end of the constant current driving module is connected with the output end of the reference voltage control module, and the output end of the constant current driving module is connected with the LED light-emitting module;
the signal sampling module is used for collecting a voltage signal of a power supply; the constant current driving module is used for maintaining the current flowing through the LED light-emitting module to be constant; the constant power regulating module is used for maintaining the output power of the power supply at a preset power value; the reference voltage control module is used for receiving the voltage signal collected by the signal sampling module, and when the power supply is started, the voltage of the second input end of the constant current driving module is controlled to be at a preset voltage value based on the voltage signal, so that the current flowing through the LED light-emitting module is stably increased to be a constant current value.
Preferably, the preset voltage value is greater than a voltage value of the first input end of the constant current driving module.
Further, the reference voltage control module comprises a comparator, an oscillator and a converter, and the constant current driving module comprises an operational amplifier; the positive phase input end of the comparator is connected with the output end of the signal sampling module, the negative phase input end of the comparator is connected with the reference voltage, the output end of the comparator is connected with the input end of the oscillator, the output end of the oscillator is connected with the input end of the converter, the output end of the converter is connected with the positive phase input end of the operational amplifier, and the negative phase input end of the operational amplifier is connected with the output end of the signal sampling module;
the comparator is used for controlling the oscillator to be opened or closed according to the voltage signal collected by the signal sampling module; the oscillator is used for generating a pulse signal with a preset frequency when being started; the converter is used for converting the pulse signal output by the oscillator into an analog signal with a preset threshold value.
Preferably, the oscillator is turned on when the voltage value of the non-inverting input terminal of the comparator is lower than the voltage value of the inverting input terminal.
Furthermore, the converter comprises a counting converter and a digital-to-analog converter, wherein the input end of the counting converter is connected with the output end of the oscillator, the output end of the counting converter is connected with the input end of the digital-to-analog converter, and the output end of the digital-to-analog converter is connected with the positive input end of the operational amplifier;
the counting converter is used for converting the pulse signals output by the oscillator into at least two groups of digital signals; the digital-to-analog converter is used for converting the digital signals of the at least two groups into analog signals of a preset threshold value.
Preferably, the counting converter comprises four outputs for expanding the pulse signal output by the oscillator to a plurality of sets of digital signals.
Furthermore, the constant current driving module further comprises a field effect transistor, and the output end of the operational amplifier is connected with the LED light emitting module through the field effect transistor.
Furthermore, the reference voltage control module comprises a first capacitor and a first resistor, the constant current driving module comprises an operational amplifier, one end of the first resistor is connected with the output end of the signal sampling module, the other end of the first resistor is respectively connected with one end of the first capacitor and the positive input end of the operational amplifier, the other end of the first capacitor is grounded, and the first capacitor is used for charging when the power supply is turned on.
Furthermore, the constant current driving module comprises a plurality of sub constant current driving modules, the second input end of each sub constant current driving module is respectively connected with one output end of the reference voltage control module, and the output end of each sub constant current driving module is respectively connected with one LED light-emitting module or one LED lamp in the LED light-emitting module.
Correspondingly, the invention also provides an LED lighting device which comprises an LED light-emitting module and the LED constant-current and constant-power driving circuit, wherein the output end of the LED constant-current and constant-power driving circuit is electrically connected with the LED light-emitting module.
Compared with the prior art, the scheme of the invention has the following advantages:
according to the LED constant-current and constant-power driving circuit, the input end of a signal sampling module is connected with a power supply, the output end of the signal sampling module is respectively connected with the input end of a reference voltage control module and the first input end of a constant-current driving module, a constant-power adjusting module is connected between the output end of the signal sampling module and the first input end of the constant-current driving module, the second input end of the constant-current driving module is connected with the output end of the reference voltage control module, and the output end of the constant-current driving module is connected with an LED light-emitting module; the signal sampling module is used for collecting voltage signals of a power supply; the constant current driving module is used for maintaining the current flowing through the LED light-emitting module to be constant; the constant power regulating module is used for maintaining the output power of the power supply at a preset power value; the reference voltage control module is used for receiving the voltage signal collected by the signal sampling module, and when the power supply is started, the voltage of the second input end of the constant current driving module is controlled to be at a preset voltage value based on the voltage signal, so that the current flowing through the LED light-emitting module is stably increased to a constant current value, the phenomenon of overshoot of the current flowing through the LED light-emitting module can not be generated at the moment of starting the LED constant current and constant power driving circuit, the LED light-emitting module is protected, and the service life of the LED light-emitting module is prolonged.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a detailed circuit diagram of a conventional constant power control system;
FIG. 2 is a waveform diagram of input voltage versus output current for a conventional constant power control system during operation;
FIG. 3 is a graph of the voltage waveform at port VT when the conventional constant power control system is on;
FIG. 4 is a waveform diagram of current generated within a constant power module in a conventional constant power control system;
FIG. 5 is a current waveform diagram of an LED light module when the system is turned on in the conventional constant power control system;
FIG. 6 is a block diagram of an LED constant current and power driver circuit according to an exemplary embodiment of the present invention;
FIG. 7 is a current waveform diagram of an LED light-emitting module when the LED constant current and power driving circuit of the present invention is turned on;
fig. 8 is a specific circuit diagram of an LED constant current and constant power driving circuit according to an exemplary embodiment of the present invention;
FIG. 9 is a table showing the binary code signal at the output port of the counting converter and the corresponding output voltage of the DAC according to the present invention;
FIG. 10 is a waveform diagram of the output voltage of the reference voltage control module when the LED constant current and power driving circuit of the present invention is turned on;
fig. 11 is a specific circuit diagram of an LED constant current and constant power driving circuit according to yet another exemplary embodiment of the present invention;
fig. 12 is a specific circuit diagram of an LED constant current and constant power driving circuit according to still another exemplary embodiment of the present invention;
fig. 13 is a specific circuit diagram of an LED constant current and constant power driving circuit according to another exemplary embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
As shown in fig. 1, fig. 1 is a specific circuit diagram of a conventional constant power control system, in which an input voltage Uin can be obtained from an input end of a power supply module or a constant current input module, and a voltage Vin of the LED string 13 can also be obtained from an input end of the power supply module or the constant current input module, and is consistent with the input voltage Uin. The resistors R1 and R2 and the MOS transistor M1 form a working loop, the working current of the working loop passes through the mirror current module 11 and the mirror current module 12 and then outputs a mirror current I1, and the mirror current I1 can be calculated according to the following formula one:
wherein Vth is a voltage value of a source terminal of the MOS transistor M1 after the MOS transistor M1 is turned on, K1 is a current ratio of the mirror current module 11, and K2 is a current ratio of the mirror current module 12.
Further, after the output mirror current I1 of the mirror current module 12 is input to the operational amplifier INV1 of the constant current driving module, the current of the LED string 13 can be calculated by the following formula two:
vref1 is a reference voltage at the non-inverting input terminal of the operational amplifier INV1, Rext is a current adjusting resistor, and R3 is a resistor connected between the inverting input terminal of the operational amplifier INV1 and the current adjusting resistor Rext.
As can be seen from the first and second formulas, when the supply voltage Vin is a fixed value, the current Iout of the LED string 13 is a fixed value. When the mirror current I1 changes, the loop current Iout of the LED light string 13 changes, and with a formula, only the voltage Vin is a variable, and as the input voltage Uin of the power supply module increases, the voltage Vin also increases, the mirror current I1 increases, and the current Iout of the LED light string 13 decreases; when the input voltage Uin of the power supply module decreases, the voltage Vin decreases, the mirror current I1 decreases, and the current Iout of the LED string 13 increases. Therefore, during the operation of the system, the input voltage Uin and the output current Iout have opposite trends, which can be seen in the waveform diagram of the system shown in fig. 2.
Further, as shown with continued reference to fig. 1, the capacitor C1 converts the voltage signal at the port VT into a dc voltage. At the moment of starting the system, the input voltage Uin charges the capacitor C1 through the resistor R1, and during the charging process of the capacitor C1, the voltage of the port VT rises from 0V to a fixed value Uvt through time t. The calculation formula of the voltage in the capacitor charging process is as follows:
wherein, I is the current in the charging process of the capacitor, and C is the capacitance value of the capacitor C1. According to the third formula, and as shown in fig. 3, the voltage of the port VT is gradually increased along with the charging time t, and during the time t, the current of the port VT loop is changed from 0 to a fixed current value
In addition, as shown in fig. 4, the mirror current I1 generated after passing through the mirror current module 11 and the mirror current module 12 also increases the current waveform from 0 to a fixed value at the system startup instant, and when the mirror current I1 is the minimum value of 0, the startup current Iout of the LED string 13 is the maximum value as can be known from the second formula, so as shown in fig. 5, at a point a in fig. 5, a current overshoot phenomenon occurs at the system startup instant, which easily causes damage or breakdown of the LED lamp and damages the lighting device. After the system is turned on, the system fully charges the capacitor C1, the voltage at the port VT is kept constant, and when the mirror current I1 is the maximum value, the current Iout of the LED string 13 is reduced to the minimum value, and the current value is output constantly.
Therefore, the problems that the LED lamp is damaged or broken down, the lighting device is damaged, and the service life of the lighting device is shortened due to the fact that the output current of the conventional LED constant-current constant-power driving circuit overshoots at the moment of starting are solved. The invention provides an LED constant-current and constant-power driving circuit, which is used for driving an LED light-emitting module, wherein in an exemplary embodiment, as shown in FIG. 6, the LED constant-current and constant-power driving circuit comprises a signal sampling module 2, a constant-current driving module 4, a reference voltage control module 3 and a constant-power regulating module 6; wherein,
the input end of the signal sampling module 2 is connected with the power supply 1 or the power supply module, the output end of the signal sampling module 2 is respectively connected with the input end of the reference voltage control module 3 and the first input end of the constant current driving module 4, the constant power adjusting module 6 is connected between the output end of the signal sampling module 2 and the first input end of the constant current driving module 4, the second input end of the constant current driving module 4 is connected with the output end of the reference voltage control module 3, and the output end of the constant current driving module 4 is connected with the LED light-emitting module 5.
The signal sampling module 2 is used for collecting a voltage signal of the power supply 1; the constant current driving module 4 is used for driving the LED light emitting module 5 to emit light and maintaining the current flowing through the LED light emitting module 5 constant; the constant power adjusting module 6 is used for maintaining the output power of the power supply 1 at a preset power value, so that the constant power function of the LED constant-current constant-power driving circuit is realized, and the overload is prevented. The reference voltage control module 3 is configured to receive a voltage signal collected by the signal sampling module 2, and when the power supply 1 is turned on, control the voltage of the second input terminal of the constant current driving module 4 to be a preset voltage value based on the voltage signal, so that the constant current driving module 4 adjusts the output current according to the voltages of the first input terminal and the second input terminal, and further, the current flowing through the LED light emitting module 5 is steadily increased to a constant current value.
As shown in fig. 7, in the LED constant current and constant power driving circuit of the present invention, at the instant of system startup, i.e. in the time period t1 in the figure, the waveform of the current Iout flowing through the LED light emitting module 5 also steadily increases from 0, after the system is started, the capacitor C1 is fully charged by the system, the port VT maintains a fixed voltage, and at this time, the current Iout of the LED light emitting module 5 is maintained at a fixed value.
According to the LED constant-current and constant-power driving circuit, the input end of a signal sampling module 2 is connected with a power supply 1, the output end of the signal sampling module is respectively connected with the input end of a reference voltage control module 3 and the first input end of a constant-current driving module 4, a constant-power adjusting module 6 is connected between the output end of the signal sampling module 2 and the first input end of the constant-current driving module 4, the second input end of the constant-current driving module 4 is connected with the output end of the reference voltage control module 3, and the output end of the constant-current driving module 4 is connected with an LED light-emitting module 5; the signal sampling module 2 is used for collecting a voltage signal of the power supply 1; the constant current driving module 4 is used for maintaining the current flowing through the LED light-emitting module 5 to be constant; the constant power regulating module 6 is used for maintaining the output power of the power supply at a preset power value; the reference voltage control module 3 is configured to receive the voltage signal collected by the signal sampling module 2, and when the power supply 1 is turned on, control the voltage at the second input end of the constant current driving module 4 to be at a preset voltage value based on the voltage signal, so that the current flowing through the LED light emitting module 5 is stably increased to a constant current value, and thus the current flowing through the LED light emitting module 5 does not overshoot at the instant of starting the LED constant current and constant power driving circuit, so as to protect the LED light emitting module 5 and prolong the service life of the LED light emitting module 5.
Further, as shown in fig. 8, the constant power regulating module 6 includes a mirror current module 11 and a mirror current module 12, the mirror current module 11 includes a resistor R2 and two fets M1 and M2, the mirror current module 12 includes two fets M3 and M4, gates of the two fets M1 and M2 of the mirror current module 11 are connected to each other, a source of the fet M1 is connected to the gate and one end of the resistor R2, a drain of the fet M1 is grounded, the other end of the resistor R2 is connected to an output end of the signal sampling module 2, a source of the fet M2 is connected to the drain and the gate of the fet M3 of the mirror current module 12, a drain of the fet M2 is grounded, gates of the two fets M3 and M4 of the mirror current module 12 are connected to each other, the sources are all connected with the voltage VDD, and the drain of the field effect transistor M4 is connected with the first input terminal of the constant current driving module 4.
Further, as shown in fig. 8, the signal sampling module 2 includes a resistor R1 and a capacitor C1, wherein one end of the resistor R1 is connected to one end of the capacitor C1 and the input end of the constant power adjusting module 6, the other end of the resistor R1 is connected to the power Vin, and the other end of the capacitor C1 is grounded.
Further, the reference voltage control module 3 includes a comparator INV2, an oscillator, and a converter, and the constant current driving module 4 includes an operational amplifier INV 1; the normal phase input end of the comparator INV2 is connected with the output end of the signal sampling module 2, the inverted phase input end is connected with the reference voltage V1, the output end of the comparator INV2 is connected with the input end of the oscillator, the output end of the oscillator is connected with the input end of the converter, the output end of the converter is connected with the normal phase input end of the operational amplifier INV1, and the inverted phase input end of the operational amplifier INV1 is connected with the output end of the signal sampling module 2.
The comparator INV2 is configured to control the oscillator to be turned on or off according to the voltage signal collected by the signal sampling module 2; the oscillator is used for generating a pulse signal with a preset frequency when being started; the converter is used for converting the pulse signal output by the oscillator into an analog signal with a preset threshold value.
Preferably, the preset voltage value is greater than the voltage value of the first input end of the constant current driving module 4, so that the difference between the positive phase input end and the negative phase input end of the operational amplifier INV1 is always a positive value at any time. In addition, when the voltage value of the non-inverting input terminal of the comparator INV2 is lower than the voltage value of the inverting input terminal, the oscillator is turned on.
Further, the converter comprises a counting converter and a digital-to-analog converter, an input end of the counting converter is connected with an output end of the oscillator, an output end of the counting converter is connected with an input end of the digital-to-analog converter, and an output end of the digital-to-analog converter is connected with a non-inverting input end of the operational amplifier INV 1;
the counting converter is used for converting the pulse signals output by the oscillator into at least two groups of digital signals; the digital-to-analog converter is used for converting the digital signals of the at least two groups into analog signals of a preset threshold value.
Preferably, with continued reference to fig. 8, the counting converter includes four outputs for expanding the pulse signal output by the oscillator to a plurality of sets of digital signals, such as sixteen sets of digital signals in fig. 9, to output different voltage values accordingly.
Further, the constant current driving module 4 further includes two resistors R3, Rext and a field effect transistor M5, an output end of the operational amplifier INV1 is connected to the LED light emitting module 5 through the field effect transistor, one end of the resistor R3 is connected to an inverting input end of the operational amplifier INV1, the other end of the resistor R3 is connected to one end of the resistor Rext and a drain of the field effect transistor, the other end of the resistor Rext is grounded, and a source of the field effect transistor M5 is connected to the LED light emitting module 5, so that constant current driving of the LED light emitting module 5 is realized, and the LED light emitting module 5 stably operates.
Specifically, at the instant of power-on of the system, the input voltage Vin of the signal sampling module 2 charges the capacitor C1 through the resistor R1, and generates a voltage at the port VT, the voltage enters the non-inverting input terminal of the comparator INV2, the inverting input terminal of the comparator INV2 is connected to the fixed voltage V1, the output terminal of the comparator INV2 outputs a signal EN to control the on and off of the oscillator, when the voltage value at the non-inverting input terminal of the comparator INV2 is smaller than the voltage value at the inverting input terminal thereof, the output signal EN is low, and the oscillator continues to work; when the voltage value at the non-inverting input terminal of the comparator INV2 is greater than the voltage value at the inverting input terminal thereof, i.e. after the capacitor C1 is charged, the output signal EN is high, and the oscillator stops working. In the charging time period t of the capacitor C1, the voltage value of the port VT is less than the fixed voltage V1, the oscillator continues to operate, the pulse signal generated by the oscillator is output to the counting converter, the counting converter may include 4 output ports S1, S2, S3, S4, 16 groups of digital signals of 4-bit binary code may be output, the binary code signal enters the digital-to-analog converter, the conversion generates an analog signal, and the value of the analog signal changes with the size of the binary code, the larger the value of the analog signal, as shown in fig. 9.
An analog signal output by the digital-to-analog converter is input to a non-inverting input end of the constant current driving module 4, the constant current driving module 4 performs constant current control on the LED light emitting module 5, and the current on the LED light emitting module 5 is
As can be seen from the above description, and as shown in fig. 10, at the power-on instant of the system, the value of I1 is gradually increased along with the time t, and the value of the analog signal Vref1 output by the digital-to-analog converter is also gradually increased along with the time t. By setting the internal parameters of the reference voltage control module 3, the value of the analog signal output by the digital-to-analog converter can be adjusted, so that the value of Vref 1-I1R 3 in the formula two is always a positive value at any moment, and the current Iout on the LED string can gradually rise in the process of charging the capacitor C1 for time t.
In another embodiment, the reference voltage control module 3 of the present invention may also adopt an RC circuit architecture, specifically, as shown in fig. 11, the reference voltage control module 3 includes a first capacitor C2 and a first resistor R4, the constant current driving module 4 includes an operational amplifier INV1, one end of the first resistor R4 is connected to the output end of the signal sampling module 2, the other end of the first resistor R4 is respectively connected to one end of a first capacitor C2 and the non-inverting input end of an operational amplifier INV1, the other end of the first capacitor C2 is grounded, and the first capacitor C2 is used for charging when the power supply 1 is turned on. Specifically, at the instant of powering on the system, a fixed reference voltage V1 charges the first capacitor C2 through the first resistor R4 to generate a voltage Vref1, as can be seen from the formula three, the voltage Vref1 gradually rises along with the charging time t, and by setting the RC parameter of the reference voltage control module 3, the voltage value of the Vref1 can be adjusted, so that the value of Vref 1-I1R 3 is always a positive value at any time, and as can be seen from the formula two, the current Iout on the LED lighting module 5 can gradually rise in the process of charging the capacitor C1 for the charging time t, so as to achieve the effect of no current overshoot at the time of powering on.
Further, the constant current driving module 4 includes a plurality of sub constant current driving modules 4, a second input end of each sub constant current driving module 4 is connected to an output end of the reference voltage control module 3, and an output end of each sub constant current driving module 4 is connected to one LED light emitting module 5 or one LED lamp in the LED light emitting module 5. Specifically, as shown in fig. 12, 2 sections of LED lamp beads are driven by 2 paths of constant current sources inside the constant current driving module 4, and 2 paths of reference voltages Vref1 and Vref2 are generated by the reference voltage control module 3 and are respectively input to the constant current driving module 4, so that no current overshoot is generated at the moment that the multi-section LED light emitting module 5 is turned on.
Further, as shown in fig. 13, the reference voltage control module 3, the constant power regulating module 6 and the constant current module may be integrated in the same module U1, the power supply module may be composed of a rectifier bridge stack DB1 and a thermal relay FR1, two input ends of the rectifier bridge stack DB1 are respectively connected to the live line L and the neutral line N, an anode output end is connected to the input end of the signal sampling module 2, and a cathode output end is grounded.
Correspondingly, the invention also provides an LED lighting device, which comprises an LED light-emitting module 5 and the LED constant-current constant-power driving circuit, wherein the output end of the LED constant-current constant-power driving circuit is electrically connected with the LED light-emitting module 5 so as to protect the LED light-emitting module 5 and prolong the service life of the LED light-emitting module 5.
In summary, the most beneficial effects of the invention are as follows:
according to the LED constant-current constant-power driving circuit and the LED lighting device, the input end of a signal sampling module 2 is connected with a power supply 1, the output end of the signal sampling module is respectively connected with the input end of a reference voltage control module 3 and the first input end of a constant-current driving module 4, the second input end of the constant-current driving module 4 is connected with the output end of the reference voltage control module 3, and the output end of the constant-current driving module 4 is connected with an LED light-emitting module 5; the signal sampling module 2 is used for collecting a voltage signal of the power supply 1; the constant current driving module 4 is used for maintaining the current flowing through the LED light-emitting module 5 to be constant; the reference voltage control module 3 is configured to receive the voltage signal collected by the signal sampling module 2, and when the power supply 1 is turned on, control the voltage at the second input end of the constant current driving module 4 to be at a preset voltage value based on the voltage signal, so that the current flowing through the LED light emitting module 5 is stably increased to a constant current value, and thus the current flowing through the LED light emitting module 5 does not overshoot at the instant of starting the LED constant current and constant power driving circuit, so as to protect the LED light emitting module 5 and prolong the service life of the LED light emitting module 5.
The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An LED constant-current constant-power driving circuit is used for driving an LED light-emitting module and is characterized by comprising a signal sampling module, a constant-current driving module, a reference voltage control module and a constant-power regulating module; wherein,
the input end of the signal sampling module is connected with a power supply, the output end of the signal sampling module is respectively connected with the input end of the reference voltage control module and the first input end of the constant current driving module, the constant power adjusting module is connected between the output end of the signal sampling module and the first input end of the constant current driving module, the second input end of the constant current driving module is connected with the output end of the reference voltage control module, and the output end of the constant current driving module is connected with the LED light-emitting module;
the signal sampling module is used for collecting a voltage signal of a power supply; the constant current driving module is used for maintaining the current flowing through the LED light-emitting module to be constant; the constant power regulating module is used for maintaining the output power of the power supply at a preset power value; the reference voltage control module is used for receiving the voltage signal collected by the signal sampling module, and when the power supply is started, the voltage of the second input end of the constant current driving module is controlled to be at a preset voltage value based on the voltage signal, so that the current flowing through the LED light-emitting module is stably increased to be a constant current value.
2. The LED constant-current and constant-power driving circuit according to claim 1, wherein the preset voltage value is greater than a voltage value of the first input terminal of the constant-current driving module.
3. The LED constant-current and constant-power driving circuit according to claim 1, wherein the reference voltage control module comprises a comparator, an oscillator and a converter, and the constant-current driving module comprises an operational amplifier; the positive phase input end of the comparator is connected with the output end of the signal sampling module, the negative phase input end of the comparator is connected with the reference voltage, the output end of the comparator is connected with the input end of the oscillator, the output end of the oscillator is connected with the input end of the converter, the output end of the converter is connected with the positive phase input end of the operational amplifier, and the negative phase input end of the operational amplifier is connected with the output end of the signal sampling module;
the comparator is used for controlling the oscillator to be opened or closed according to the voltage signal collected by the signal sampling module; the oscillator is used for generating a pulse signal with a preset frequency when being started; the converter is used for converting the pulse signal output by the oscillator into an analog signal with a preset threshold value.
4. The LED constant-current and constant-power driving circuit as claimed in claim 3, wherein the oscillator is turned on when a voltage value of a non-inverting input terminal of the comparator is lower than a voltage value of an inverting input terminal.
5. The LED constant-current and constant-power driving circuit as claimed in claim 3, wherein the converter comprises a counting converter and a digital-to-analog converter, an input end of the counting converter is connected with an output end of the oscillator, an output end of the counting converter is connected with an input end of the digital-to-analog converter, and an output end of the digital-to-analog converter is connected with a non-inverting input end of the operational amplifier;
the counting converter is used for converting the pulse signals output by the oscillator into at least two groups of digital signals; the digital-to-analog converter is used for converting the digital signals of the at least two groups into analog signals of a preset threshold value.
6. The LED constant-current and constant-power driving circuit as claimed in claim 5, wherein the count converter comprises four output terminals for expanding the pulse signal output by the oscillator to a plurality of sets of digital signals.
7. The LED constant-current and constant-power driving circuit according to claim 3, wherein the constant-current driving module further comprises a field effect transistor, and the output end of the operational amplifier is connected with the LED light emitting module through the field effect transistor.
8. The LED constant-current and constant-power driving circuit according to claim 1, wherein the reference voltage control module comprises a first capacitor and a first resistor, the constant-current driving module comprises an operational amplifier, one end of the first resistor is connected to the output end of the signal sampling module, the other end of the first resistor is respectively connected to one end of the first capacitor and the positive input end of the operational amplifier, the other end of the first capacitor is grounded, and the first capacitor is used for charging when a power supply is turned on.
9. The LED constant-current and constant-power driving circuit according to claim 1, wherein the constant-current driving module comprises a plurality of sub constant-current driving modules, the second input end of each sub constant-current driving module is connected to one output end of the reference voltage control module, and the output end of each sub constant-current driving module is connected to one LED light-emitting module or one LED lamp in the LED light-emitting module.
10. An LED lighting device, comprising an LED light-emitting module and the LED constant-current constant-power driving circuit as claimed in any one of claims 1 to 9, wherein the output end of the LED constant-current constant-power driving circuit is electrically connected with the LED light-emitting module.
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