CN110475409B - Voltage control device - Google Patents
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Abstract
The present invention relates to a voltage control apparatus comprising: the power supply module, constant current control module and eliminate stroboscopic light-emitting module, wherein, eliminate stroboscopic light-emitting module includes: a light emitting module and a strobe elimination module; the power supply module is respectively connected with the constant current control module and the strobe elimination light-emitting module and is used for supplying power to the constant current control module and the strobe elimination light-emitting module; the constant current control module is connected with the stroboscopic elimination light-emitting module in series or in parallel and is used for improving the power factor of the light-emitting module and keeping the power factor constant; the stroboscopic elimination module is connected with the light-emitting module in series or in parallel and is used for eliminating stroboscopic of the light-emitting module. By arranging the constant current control module and the flash eliminating module in the light emitting module, the power factor of the light emitting module can be improved, and the flash of the light emitting module can be ensured to be reduced, so that the visual experience of a human body is improved.
Description
Technical Field
The present invention relates to the field of electronic circuits, and in particular, to a voltage control device.
Background
Along with the development of social economy, more and more LED products are in life production of people, wherein a linear full-voltage constant-current control power supply can ensure constant current, ensure stable operation of a lamp, and is widely applied.
However, the existing linear full-voltage constant-current control Power supply or finished lamp in the current market has serious defects, for example, the product does not have a hard index of high Power Factor (PF), or a light source emitted by an LED has serious stroboscopic effect, so that eye fatigue occurs or eye injury can be caused, and the visual experience effect of a human body is poor.
Disclosure of Invention
Based on this, it is necessary to provide a voltage control device for solving the problems that the prior art has a high PF, or the light source emitted by the LED has serious stroboscopic effect, and eye fatigue occurs or eye damage is caused, resulting in poor visual experience effect of human body.
In order to solve the above technical problems, a voltage control apparatus is provided, including: the power supply module, constant current control module and eliminate stroboscopic light-emitting module, wherein, eliminate stroboscopic light-emitting module includes: a light emitting module and a strobe elimination module;
the power supply module is respectively connected with the constant current control module and the strobe elimination light-emitting module and is used for supplying power to the constant current control module and the strobe elimination light-emitting module;
The constant current control module is connected with the stroboscopic elimination light-emitting module in series or in parallel and is used for improving the power factor of the light-emitting module and keeping the power factor constant;
The stroboscopic elimination module is connected with the light-emitting module in series or in parallel and is used for eliminating stroboscopic of the light-emitting module.
Optionally, the power supply module includes: a first winding resistor FR1 and a first rectifier bridge DB1;
One end of the first winding resistor FR1 is connected with a mains supply terminal, the other end of the first winding resistor FR1 is connected with an alternating current pin 1 of the first rectifier bridge DB1, and a positive electrode pin 2, an alternating current pin 3 and a negative electrode pin 4 of the first rectifier bridge DB1 are respectively connected with one end of the constant current control module, the other terminal of the mains supply and the ground.
Optionally, the constant current control module includes: the first constant current source 1, the second constant current source 2, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the first diode D1, the second diode D2 and the first energy storage capacitor E1;
The VT end of the first constant current source 1 is respectively connected with one end of a third resistor R3 and one end of a fourth resistor R4, the other end of the third resistor R3 is respectively connected with the power supply module, the OUT end of the first constant current source 1 and the anode end of the first energy storage capacitor E1, and the other end of the fourth resistor is respectively connected with the GND end of the first constant current source 1 and the stroboscopic elimination light-emitting module;
The REXT end of the first constant current source 1 is respectively connected with one end of the first resistor R1, and the other end of the first resistor R1 is respectively connected with the GND end of the first constant current source 1, the other end of the fourth resistor R4, the strobe elimination light emitting module and the first end of the second resistor R2;
The REXT end of the second constant current source 2 is connected with the second end of the second resistor R2, the OUT end of the second constant current source 2 is connected with the cathode end of the first diode D1, and the anode end of the first diode D1 is respectively connected with the cathode end of the first energy storage capacitor E1 and the cathode end of the second diode D2;
And the GND end of the second constant current source 2 is respectively connected with the first end of the second resistor R2, the other end of the first resistor R1, the other end of the fourth resistor R4 and the strobe elimination light emitting module.
Optionally, the first constant current source 1 includes: the first amplifier INV1, the second amplifier INV2, the first field effect transistor M1, the second field effect transistor M2, the first constant current resistor R1 'and the second constant current resistor R2';
the positive input end of the first amplifier INV1 is the VT end of the first constant current source 1, the output end of the first amplifier INV1 is connected with the gate G of the first field effect transistor M1, the drain D of the first field effect transistor M1 is connected with the power supply VDD, the source S of the first field effect transistor M1 is respectively connected with one end of the second constant current resistor R2 'and the inverting input end of the first amplifier INV1, and the other end of the second constant current resistor R2' is the GND end of the first constant current source 1;
The inverting input end of the second amplifier INV2 is respectively connected with the drain D of the first field effect transistor M1, the power supply VDD and one end of the first constant current resistor R1', the output end of the second amplifier INV2 is connected with the gate G of the second field effect transistor M2, the drain of the second field effect transistor M2 is the OUT end of the first constant current source 1, and the source S of the second field effect transistor M2 is the REXT end of the first current source 1 and is connected with the other end of the second constant current resistor R2'.
Optionally, the second constant current source 2 includes: a third amplifier INV3 and a third field effect transistor M3;
The output end of the third amplifier INV3 is connected to the gate G of the third field effect transistor M3, the drain electrode of the third field effect transistor M3 is the OUT end of the second constant current source 2, and the source electrode of the third field effect transistor M3 and the inverting input end of the third amplifier are the REXT end of the second constant current source 2.
Optionally, the power supply module includes: the second winding resistor FR2, the protection resistor RV1, the second rectifier bridge DB2 and the third diode D3;
one end of the second winding resistor FR2 is connected with a mains supply terminal, the other end of the second winding resistor FR2 is respectively connected with one end of the protection resistor RV1 and the ac pin 1 of the second rectifier bridge DB2, the positive electrode pin 2, the ac pin 3 and the negative electrode pin 4 of the second rectifier bridge DB2 are respectively connected with the anode of the third diode D3, the other terminal of the mains supply and the ground, the other end of the protection resistor RV2 is connected with the other terminal of the mains supply, and the negative electrode of the third diode D3 is connected with the constant current control module or the flash eliminating light emitting module.
Optionally, the constant current control module includes: the constant current control chip U1, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the fourth diode D4, the fifth diode D5 and the second energy storage capacitor E2;
The VT pin of the constant current control chip U1 is respectively connected with one ends of the seventh resistor R7 and the eighth resistor R8, the other end of the seventh resistor R7 is connected with the cathode of the third diode D3, the REXT1 pin and the REXT2 pin of the constant current control chip U1 are respectively connected with the fifth resistor R5 and the sixth resistor R6, the other ends of the fifth resistor R5, the sixth resistor R6 and the eighth resistor R8 are grounded, the OUT2 pin and the VIN pin of the constant current control chip U1 are respectively connected with the cathode of the third diode D3, the OUT1 pin of the constant current control chip U1 is connected with the cathode of the fourth diode D4, the anode of the fourth diode D4 is connected with the cathode of the fifth diode D5, and the anode of the fifth diode D5 is connected with the flash elimination module.
Optionally, the strobe elimination module includes: the strobe elimination chip U2, the ninth resistor R9, the third energy storage capacitor E3 and the first capacitor C1;
the VC pin of the flash eliminating chip U2 is connected with one end of the first capacitor C1, the other end of the first capacitor C1 is respectively connected with the cathode of the third energy storage capacitor E3 and one end of the ninth resistor R9, the anode of the ninth resistor R9 and the anode of the third energy storage capacitor E3 are grounded, the OUT end of the flash eliminating chip U2 is connected with one end of the light emitting module, and the other end of the light emitting module is grounded.
Optionally, the strobe elimination module is disposed at a front end, a middle end or a rear end of the light emitting unit string in the light emitting module.
Optionally, the light emitting module is formed by connecting a plurality of light emitting diodes in series or in parallel.
According to the voltage control device provided by the invention, the constant current control module and the stroboscopic elimination module are arranged in the light-emitting module, so that the power factor of the light-emitting module can be improved, the stroboscopic reduction of the light-emitting module can be ensured, and the visual experience of a human body is improved.
Drawings
Fig. 1 is a schematic structural diagram of a voltage control device according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of another voltage control device according to an embodiment of the present invention.
Fig. 3 (a) is a schematic diagram illustrating connection between a strobe eliminating module and a light emitting unit according to an embodiment of the present invention.
Fig. 3 (b) is a schematic diagram illustrating connection between a strobe eliminating module and a light emitting unit according to another embodiment of the present invention.
Fig. 3 (c) is a schematic diagram illustrating connection between a strobe eliminating module and a light emitting unit according to an embodiment of the present invention.
Fig. 4 is a schematic circuit diagram of a voltage control device according to an embodiment of the present invention.
Fig. 5 is a schematic circuit diagram of a first constant current source according to an embodiment of the present invention.
Fig. 6 is a schematic circuit diagram of a second constant current source according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of an AC input voltage waveform and a current waveform when the input voltage is 120Va according to an embodiment of the present invention.
Fig. 8 is a schematic diagram of an AC input voltage waveform and a current waveform when the input voltage is 150Va according to an embodiment of the present invention.
Fig. 9 is a schematic diagram of an AC input voltage waveform and a current waveform when the input voltage is 220Va according to an embodiment of the present invention.
Fig. 10 is a schematic circuit diagram of another voltage control apparatus according to an embodiment of the present invention.
Fig. 11 is a schematic circuit diagram of another voltage control apparatus according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a voltage control apparatus according to an embodiment of the present invention, and as shown in fig. 1, the voltage control apparatus includes: the power supply module 1, constant current control module 2 and eliminate stroboscopic light-emitting module, wherein, eliminate stroboscopic light-emitting module and include: a light emitting module 31 and a strobe eliminating module 32;
the power supply module 1 is respectively connected with the constant current control module 2 and the stroboscopic elimination light-emitting module and is used for supplying power to the constant current control module 2 and the stroboscopic elimination light-emitting module;
The constant current control module 2 is connected with the stroboscopic light-emitting module in series or in parallel and is used for improving the power factor of the light-emitting module 31 and keeping the power factor constant;
The strobe-eliminating module 32 is connected in series or parallel with the light emitting module 31 for eliminating strobe of the light emitting module 31.
In some embodiments, the constant current control module 2 may have various connection relations with the light emitting module 31 and the flash eliminating module 32 in the flash eliminating light emitting module, as shown in fig. 1 and 2, in fig. 1, the power supply module 1 is connected with the constant current control module 2 and the flash eliminating module 32, the constant current control module 2 is connected with the light emitting module 31, and the light emitting module 32 is connected with the flash eliminating module 32. In fig. 2, a power supply module 1 is connected to a constant current control module 2 and a light emitting module 31, the constant current control module 2 is connected to a strobe elimination module 32, and the light emitting module 32 is connected to the strobe elimination module 32.
It should be noted that the light emitting module 31 may be formed by connecting a plurality of light emitting units in series or in parallel, where the light emitting units may be light emitting diode bulbs. The strobe elimination module 32 may be disposed at the front end, middle or rear end of the light emitting unit string in the light emitting module 31 in series with the light emitting units. As shown in fig. 3a, b and c, the connection between the strobe elimination module 32 and the light emitting unit is shown.
The strobe elimination module 32 can reduce the current ripple in the light emitting module 31, and can be a function circuit module to obtain an integrated circuit control chip, and the specific form is not limited as long as the strobe elimination function can be realized.
An embodiment of the present invention provides a voltage control device, as shown in fig. 4, and fig. 4 is a schematic circuit structure diagram of the voltage control device according to the embodiment of the present invention.
As shown in fig. 4, the power supply module 1 includes: a first winding resistor FR1 and a first rectifier bridge DB1; one end of the first winding resistor FR1 is connected with a mains supply terminal, the other end of the first winding resistor FR1 is connected with an alternating current pin 1 of the first rectifier bridge DB1, and a positive electrode pin 2, an alternating current pin 3 and a negative electrode pin 4 of the first rectifier bridge DB1 are respectively connected with one end of the constant current control module 2, the other terminal of the mains supply and the ground.
The constant current control module 2 includes: the first constant current source 1, the second constant current source 2, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the first diode D1, the second diode D2 and the first energy storage capacitor E1; the VT end of the first constant current source 1 is respectively connected with one ends of a third resistor R3 and a fourth resistor R4, the other end of the third resistor R3 is respectively connected with the power supply module, the OUT end of the first constant current source 1 and the anode end of the first energy storage capacitor E1, and the other end of the fourth resistor is respectively connected with the GND end of the first constant current source 1 and the flash eliminating luminous module; the REXT end of the first constant current source 1 is respectively connected with one end of a first resistor R1, and the other end of the first resistor R1 is respectively connected with the GND end of the first constant current source 1, the other end of a fourth resistor R4, a stroboscopic elimination light-emitting module and the first end of a second resistor R2; the REXT end of the second constant current source 2 is connected with the second end of the second resistor R2, the OUT end of the second constant current source 2 is connected with the cathode end of the first diode D1, and the anode end of the first diode D1 is respectively connected with the cathode end of the first energy storage capacitor E1 and the cathode end of the second diode D2; the GND end of the second constant current source 2 is respectively connected with the first end of the second resistor R2, the other end of the first resistor R1, the other end of the fourth resistor R4 and the strobe elimination light emitting module.
The positive electrode pin 2 of the power supply module 1 is connected to the other end of the third resistor R3, the first constant current source 1, and the anode of the first energy storage capacitor.
Specifically, as shown in fig. 5, fig. 5 is a schematic circuit structure diagram of a first constant current source according to an embodiment of the present invention. Wherein the first constant current source 1 includes: the first amplifier INV1, the second amplifier INV2, the first field effect transistor M1, the second field effect transistor M2, the first constant current resistor R1 'and the second constant current resistor R2'; the non-inverting input end of the first amplifier INV1 is the VT end of the first constant current source 1, the output end of the first amplifier INV1 is connected with the grid electrode G of the first field effect transistor M1, the drain electrode D of the first field effect transistor M1 is connected with the power supply VDD, the source electrode S of the first field effect transistor M1 is respectively connected with one end of the second constant current resistor R2 'and the inverting input end of the first amplifier INV1, and the other end of the second constant current resistor R2' is the GND end of the first constant current source 1; the inverting input end of the second amplifier INV2 is respectively connected with the drain electrode D of the first field effect transistor M1, the power supply VDD and one end of the first constant current resistor R1', the output end of the second amplifier INV2 is connected with the gate electrode G of the second field effect transistor M2, the drain electrode of the second field effect transistor M2 is the OUT end of the first constant current source 1, and the source electrode S of the second field effect transistor M2 is the REXT end of the first current source 1 and is connected with the other end of the second constant current resistor R2'.
Specifically, as shown in fig. 6, fig. 6 is a schematic circuit structure diagram of a second constant current source according to an embodiment of the present invention. Wherein the second constant current source 2 includes: a third amplifier INV3 and a third field effect transistor M3; the output end of the third amplifier INV3 is connected to the gate G of the third field effect transistor M3, the drain of the third field effect transistor M3 is the OUT end of the second constant current source 2, and the source of the third field effect transistor M3 and the inverting input end of the third amplifier are the REXT end of the second constant current source 2.
The specific principle of the circuit for improving the power factor of the light emitting module is described below: the light emitting module takes an LED lamp string as an example.
The VT port of the first constant current source 1 is configured to sample, in real time, the voltage waveforms of the ac input rectification of the third resistor R3 and the fourth resistor R4 of the voltage division, and the first constant current source 1 can detect, in real time, the change of the voltage waveforms of the input power grid. When the voltage detected by the VT port of the first constant current source 1 is lower than a certain set voltage value Uvt, the output current of the first constant current source 1 is:
I out＝Vrext1/R1 formula 1
When the voltage detected by the VT port of the first constant current source 1 is higher than a certain set voltage value Uvt, the output current of the first constant current source 1 is I out＝V1rext1/Rext1＝(Vrext1-(Vt-Uvt)*Vrext1)/R1 formula 2
When the low voltage 120Vac is input, only the first constant current source 1 and the LED string form a working loop, the VT port voltage value of the first constant current source 1 can be set to be lower than the set value Uvt, the output current of the first constant current source 1 is I out＝Vrext1/R1, the duty ratio of the output current of the first constant current source 1 is n% in one power grid period, the working current waveform of the ac input end is as shown in fig. 7, and at this time, the output power of the system is:
P1=iout1×u LED ×n% equation 3
When the input voltage is higher than 120Vac (e.g. 150 Vac), and the input voltage is higher than a certain voltage point in one period of the input voltage, the VT port voltage of the first constant current source 1 is higher than a set value, the first constant current source 1 adapts to the voltage change of the power grid, the reference voltage value of the REXT port of the constant current source 1 is reduced, and at this time, the output current of the first constant current source 1 outputs an operating current waveform as shown in fig. 8 at a certain voltage moment.
In one ac cycle, the VT port detection voltage value of the first constant current source 1 is high to some extent, and as can be seen from the above formula, in one ac cycle, the output current iout1=0 of the constant current source. In a power grid period, the effective duty ratio of the output current of the first constant current source 1 is m%, the duty ratio can be adjusted through the first resistor R1 and the second resistor R2 of the voltage division, and the output current of the first constant current source 1 is a current integral value in the m% duty ratio. The system input power can be equivalently:
P2=iout1 (integral value) ×u LED ×m% equation 5
When the power grid voltage is 220Vac, the working current waveform of the alternating current input end of the system is shown in fig. 9, the power grid voltage rises in a power grid period, and when the VT port voltage of the first constant current source 1 corresponding to the rising value of the power grid voltage is lower than a set value Uvt, the working current of the first constant current source 1 output current driving LED lamp string is shown in a formula 1; as the power grid voltage rises, when the VT port voltage of the first constant current source 1 corresponding to the power grid voltage rising value is higher than a set value, the output current of the first constant current source 1 is shown as a formula 2; along with the continuous rising of the power grid voltage, the VT port voltage of the first constant current source 1 is higher than a certain value, the first constant current source 1 does not output current any more, at the moment, the voltage passes through the first energy storage capacitor E1, the first diode D1, the constant second flow source 2 and the LED lamp string form a working loop, and the second constant current source 2 outputs constant current:
i out2＝Vrext2/R2 formula 6
Along with the decrease of the power grid voltage, the energy stored by the second energy storage capacitor E2 passes through the first constant current source 1, the LED lamp string and the second diode D2 to form a working loop, and the output current of the first constant current source 1 is shown in the formula 1.
In combination with the above, under the input of the high voltage 220Vac, the system output current is that the first constant current source 1 and the second constant current source 2 jointly output a certain current value to drive the LED lamp string to work, the effective current duty ratio of the first constant current source 1 in one power grid period is p%, and the output current of the constant current source 1 is the current integral value in m% duty ratio.
I out1 (integral value) p% formula 7
The effective current duty ratio of the second constant current source 2 in one power grid period is q%, and the second constant current source 2 has an output current of I out2＝Vrext2/R2 q% in one power grid period as shown in formula 8
At high voltage 220Vac input, the system output power is:
P3= (Iout 1 (integral value) ×p% + Iout2 (integral value) ×q%) × Uled equation 9
The constant current output control base voltages Urext and Urext of the first constant current source 1 and the second constant current source 2 are fixed values, and the resistance values of the first resistor R1, the second resistor R2 and the third resistor R3 and the fourth resistor R4 of the third constant current source 1 are adjusted, so that the system output power P1 under the input of 120Vac grid voltage is equal to the output power P3 under the input of 220Vac grid voltage, the system output power is basically consistent under the input of low voltage 120Vac and high voltage 220Vac, and the system has a certain output power P2 in the middle state (for example, 150 Vac) of a high voltage range through the above steps, and therefore, the linear constant current driving power supply in the whole voltage range has a certain output power.
The above description is a working principle of a high-PF low-stroboscopic linear full-voltage control mode, and after the current of the LED lamp string is subjected to current ripple reduction treatment by the stroboscopic eliminating module in the stroboscopic eliminating unit, the test value of the flicker percentage of the LED lamp light emission meets the requirement of < 30%.
An embodiment of the present invention provides another voltage control apparatus, as shown in fig. 10, and fig. 10 is a schematic circuit diagram of another voltage control apparatus according to an embodiment of the present invention.
As shown in fig. 10, the power supply module 1 includes: the second winding resistor FR2, the protection resistor RV1, the second rectifier bridge DB2 and the third diode D3; one end of the second winding resistor FR2 is connected with a mains supply terminal, the other end of the second winding resistor FR2 is respectively connected with one end of the protection resistor RV1 and an alternating current pin 1 of the second rectifier bridge DB2, an anode pin 2, an alternating current lead 3 and a cathode pin 4 of the second rectifier bridge DB2 are respectively connected with an anode of a third diode D3, the other terminal of the mains supply and the ground, the other end of the protection resistor RV2 is connected with the other terminal of the mains supply, and a cathode of the third diode D3 is connected with a constant current control module or the flash eliminating light emitting module.
The constant current control module 2 includes: the constant current control chip U1, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the fourth diode D4, the fifth diode D5 and the second energy storage capacitor E2; the VT pin of the constant current control chip U1 is respectively connected with one ends of a seventh resistor R7 and an eighth resistor R8, the other end of the seventh resistor R7 is connected with the cathode of a third diode D3, the REXT1 pin and the REXT2 pin of the constant current control chip U1 are respectively connected with a fifth resistor R5 and a sixth resistor R6, the other ends of the fifth resistor R5, the sixth resistor R6 and the eighth resistor R8 are grounded, the OUT2 pin and the VIN pin of the constant current control chip U1 are respectively connected with the cathode of the third diode D3, the OUT1 pin of the constant current control chip U1 is connected with the cathode of a fourth diode D4, the anode of the fourth diode D4 is connected with the cathode of a fifth diode D5, and the anode of the fifth diode D5 is connected with the flash eliminating module 32.
In the embodiment of the present invention, the principle of improving the power factor of the light emitting module is detailed in the foregoing embodiment, and will not be described herein.
In the embodiment of the present invention, the strobe eliminating module 32 is a chip integrated with a strobe eliminating function, where the strobe eliminating module 32 includes: the strobe elimination chip U2, the ninth resistor R9, the third energy storage capacitor E3 and the first capacitor C1; the VC pin of the flash eliminating chip U2 is connected with one end of a first capacitor C1, the other end of the first capacitor C1 is respectively connected with the cathode of a third energy storage capacitor E3 and one end of a ninth resistor R9, the anodes of the ninth resistor R9 and the third energy storage capacitor E3 are grounded, the OUT end of the flash eliminating chip U2 is connected with one end of a light emitting module, and the other end of the light emitting module is grounded.
An embodiment of the present invention provides a voltage control apparatus, as shown in fig. 11, and fig. 11 is a schematic circuit diagram of another voltage control apparatus according to an embodiment of the present invention.
As shown in fig. 11, the specific structures of the power supply module 1, the constant current control module 2, the light emitting module 31 and the strobe elimination module 32 refer to the embodiment shown in fig. 10. The schematic diagram in fig. 10 changes the connection relationship between the power supply module and the constant current control module 2, the light emitting module 31, and the strobe elimination module 32. Wherein, the concrete connection is: the cathode of the third diode D3 in the power supply module 1 is connected with one end of a ninth resistor R9 in the light-emitting module 31 and the stroboscopic elimination module 32, the anode of the third energy storage capacitor E3 and the cathode of the sixth triode D6; the anode of the sixth triode D6 is respectively connected with the cathode of the seventh triode D7 and the anode of the second energy storage capacitor E2, and the anode of the seventh triode D7, the seventh resistor R7, the VIN pin of the constant current control chip U1, the ninth resistor R9, the cathode of the third energy storage capacitor E3 and the first capacitor are all grounded.
In this embodiment, only the connection relation of each module is changed, and the specific principle is described with reference to fig. 4, which is not repeated here.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. A voltage control apparatus, comprising: the power supply module, constant current control module and eliminate stroboscopic light-emitting module, wherein, eliminate stroboscopic light-emitting module includes: a light emitting module and a strobe elimination module;
the power supply module is respectively connected with the constant current control module and the strobe elimination light-emitting module and is used for supplying power to the constant current control module and the strobe elimination light-emitting module;
The constant current control module is connected with the stroboscopic elimination light-emitting module in series or in parallel and is used for improving the power factor of the light-emitting module and keeping the power factor constant;
The constant current control module includes: the first constant current source, the second constant current source, the first resistor, the second resistor, the third resistor, the fourth resistor, the first diode, the second diode and the first energy storage capacitor;
The VT end of the first constant current source is respectively connected with one end of a third resistor and one end of a fourth resistor, the other end of the third resistor is respectively connected with the power supply module, the OUT end of the first constant current source and the anode end of the first energy storage capacitor, and the other end of the fourth resistor is respectively connected with the GND end of the first constant current source and the flash eliminating light emitting module;
The REXT end of the first constant current source is respectively connected with one end of the first resistor, and the other end of the first resistor is respectively connected with the GND end of the first constant current source, the other end of the fourth resistor, the strobe elimination light emitting module and the first end of the second resistor;
the REXT end of the second constant current source is connected with the second end of the second resistor, the OUT end of the second constant current source is connected with the cathode end of the first diode, and the anode end of the first diode is respectively connected with the cathode end of the first energy storage capacitor and the cathode end of the second diode;
The GND end of the second constant current source is respectively connected with the first end of the second resistor, the other end of the first resistor, the other end of the fourth resistor and the stroboscopic elimination light-emitting module;
Or (b)
The constant current control module includes: the constant current control chip, the fifth resistor, the sixth resistor, the seventh resistor, the eighth resistor, the fourth diode, the fifth diode and the second energy storage capacitor;
The VT pin of the constant current control chip is respectively connected with one ends of the seventh resistor and the eighth resistor, the other end of the seventh resistor is connected with the power supply module, the REXT1 pin and the REXT2 pin of the constant current control chip are respectively connected with the fifth resistor and the sixth resistor, the other ends of the fifth resistor, the sixth resistor and the eighth resistor are grounded, the OUT1 pin and the VIN pin of the constant current control chip are both connected with the power supply module, the OUT2 pin of the constant current control chip is connected with the cathode of the fourth diode, the anode of the fourth diode is connected with the cathode of the fifth diode, and the anode of the fifth diode is connected with the flash eliminating module;
the stroboscopic elimination module is connected with the light-emitting module in series or in parallel and is used for reducing current ripple in the light-emitting module so as to eliminate stroboscopic;
the stroboscopic elimination module comprises any one of a functional circuit module and an integrated circuit control chip.
2. The voltage control apparatus of claim 1, wherein the power supply module comprises: the first winding resistor and the first rectifier bridge stack;
One end of the first winding resistor is connected with a mains supply terminal, the other end of the first winding resistor is connected with an alternating current pin of the first rectifier bridge stack, and an anode pin, an alternating current pin and a cathode pin of the first rectifier bridge stack are respectively connected with one end of the constant current control module, the other terminal of the mains supply and the ground.
3. The voltage control apparatus according to claim 1, wherein the first constant current source includes: the first amplifier, the second amplifier, the first field effect transistor, the second field effect transistor, the first constant current resistor and the second constant current resistor;
the positive-phase input end of the first amplifier is the VT end of the first constant current source, the output end of the first amplifier is connected with the grid electrode of the first field effect transistor, the drain electrode of the first field effect transistor is connected with a power supply, the source electrode of the first field effect transistor is respectively connected with one end of the second constant current resistor and the inverting input end of the first amplifier, and the other end of the second constant current resistor is the GND end of the first constant current source;
The inverting input end of the second amplifier is respectively connected with the drain electrode of the first field effect transistor, the power supply and one end of the first constant current resistor, the output end of the second amplifier is connected with the grid electrode of the second field effect transistor, the source electrode of the second field effect transistor is the OUT end of the first constant current source, and the drain electrode of the second field effect transistor is the REXT end of the first constant current source and is connected with the other end of the first constant current resistor.
4. The voltage control apparatus according to claim 1, wherein the second constant current source includes: a third amplifier and a third field effect transistor;
The output end of the third amplifier is connected with the grid electrode of the third field effect transistor, the drain electrode of the third field effect transistor is the end of the second constant current source, and the source electrode of the third field effect transistor and the inverting input end of the third amplifier are REXT ends of the second constant current source.
5. The voltage control apparatus of claim 1, wherein the power supply module comprises: the second winding resistor, the protection resistor, the second rectifier bridge stack and the third diode;
One end of the second winding resistor is connected with a mains supply wiring terminal, the other end of the second winding resistor is respectively connected with one end of the protection resistor and an alternating current pin of the second rectifier bridge stack, an anode pin, an alternating current pin and a cathode pin of the second rectifier bridge stack are respectively connected with an anode of the third diode, the other wiring terminal of the mains supply and the ground, the other end of the protection resistor is connected with the other wiring terminal of the mains supply, and a cathode of the third diode is connected with the constant current control module or the flash eliminating light emitting module.
6. The voltage control device of claim 5, wherein the other end of the seventh resistor is connected to the cathode of the third diode, and the OUT1 pin and the VIN pin of the constant current control chip are both connected to the cathode of the third diode.
7. The voltage control device of claim 6, wherein the strobe elimination module comprises: the flash eliminating chip, the ninth resistor, the third energy storage capacitor and the first capacitor;
the VC pin of the flash eliminating chip is connected with one end of the first capacitor, the other end of the first capacitor is connected with the cathode of the third energy storage capacitor and one end of the ninth resistor respectively, the anode of the ninth resistor and the anode of the third energy storage capacitor are grounded, the OUT end of the flash eliminating chip is connected with one end of the light emitting module, and the other end of the light emitting module is grounded.
8. The voltage control device of any one of claims 1 to 7, wherein the stroboscopic elimination module is disposed at a front end, a middle end, or a rear end of a light-emitting unit string in the light-emitting module.
9. The voltage control device of any one of claims 1 to 7, wherein the light emitting module is connected in series or in parallel by a plurality of light emitting diodes.
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| CN201910866638.6A CN110475409B (en) | 2019-09-12 | 2019-09-12 | Voltage control device |
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| CN201910866638.6A CN110475409B (en) | 2019-09-12 | 2019-09-12 | Voltage control device |
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| CN210579375U (en) * | 2019-09-12 | 2020-05-19 | 深圳市明微电子股份有限公司 | Voltage control device |
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| TW201332390A (en) * | 2012-01-20 | 2013-08-01 | Luxul Technology Inc | Flicker-free LED driver circuit with a high power factor |
| CN203708600U (en) * | 2014-02-12 | 2014-07-09 | 深圳市明微电子股份有限公司 | Stroboscopic-free high power factor constant current control circuit and LED lighting device |
| KR102168672B1 (en) * | 2016-05-25 | 2020-10-22 | 한국전기연구원 | Driving circuit using the constant current for improving power factor |
| CN205883647U (en) * | 2016-07-19 | 2017-01-11 | 深圳市明微电子股份有限公司 | There is not linear constant -current drive circuit of stroboscopic LED |
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| CN106793294B (en) * | 2016-12-22 | 2018-09-04 | 苏州欧普照明有限公司 | driving circuit |
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