CN103857101B - A kind of drive circuit and light fixture - Google Patents
A kind of drive circuit and light fixture Download PDFInfo
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- CN103857101B CN103857101B CN201210497271.3A CN201210497271A CN103857101B CN 103857101 B CN103857101 B CN 103857101B CN 201210497271 A CN201210497271 A CN 201210497271A CN 103857101 B CN103857101 B CN 103857101B
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Abstract
The application relates to lighting field, and the embodiment of the present application provides a kind of drive circuit and light fixture, makes when light fixture dormancy by arranging low-power consumption regulated power supply, and the stand-by power consumption of drive circuit is the lowest, saves unnecessary energy expenditure, extends the life-span of light fixture.And, by arranging control unit, current sampling circuit and DC/DC translation circuit, the electric current of the described light source to be obtained according to described current sampling circuit by control unit judges the size of current of described light source, to control described DC/DC translation circuit output stabling current to described light source, improve the stability of lamp circuit, the drive circuit making light fixture meets the reference index of high efficiency and low-power consumption, stable, low in energy consumption and the drive circuit of stand-by time length is provided, it is ensured that the piece electrical efficiency of this drive circuit and light fixture to portable lighting.
Description
Technical field
The application relates to lighting field, particularly relates to a kind of drive circuit and light fixture.
Background technology
Along with the development of lighting engineering, LED is more and more extensive in the application of general illumination field.LED is as the light source of electric lighting, and driving the efficiency of power supply and stand-by power consumption is the important references index detecting LED electrical equipment.
At present, in the driving power supply of high input voltage, the constant currents used needed for linear voltage stabilization or DC/DC mu balanced circuit offer LED load more.But when lighting is in dormancy, use linear voltage stabilization or the light fixture of DC/DC mu balanced circuit, bigger power consumption can be produced, consume the electricity of battery soon, decreasing the life-span of light fixture, the cost safeguarding light fixture causes the biggest burden, in particular for portable lighting, if battery power consumption is too fast, it is easily caused light fixture and uses the time to shorten.
Summary of the invention
Based on this, the embodiment of the present application provides a kind of efficiency height, low drive circuit and light fixture is lost.
The problem existed for above-mentioned prior art, the first aspect of the application provides a kind of drive circuit to include:
Low-power consumption regulated power supply, is used for exporting burning voltage；
DC/DC translation circuit, the power input of described DC/DC translation circuit is connected to the cathode output end of described low-power consumption regulated power supply, and the outfan of described DC/DC translation circuit is connected to the positive pole of light source；
Current sampling circuit, the test side of described current sampling circuit is connected to the negative pole of described light source, flows through the electric current of described light source for sampling；
Control unit, the signal input of described control unit controls end and is connected to the signal output part of described current sampling circuit, to obtain the electric current flowing through described light source, the output signal of described control unit controls end and is connected to the signal control end of described DC/DC translation circuit, the electric current of the described light source for obtaining according to described current sampling circuit judges the size of current of described light source, to control described DC/DC translation circuit output stabling current to described light source.
In conjunction with the application first aspect, in the implementation that the first is possible, described low-power consumption regulated power supply includes resistance R1, resistance R2, resistance R3, switching tube Q1, switching tube Q2 and electric capacity C1, wherein, first end of described resistance R1 is the cathode output end of described low-power consumption regulated power supply, first end of described resistance R1 is connected to the outfan of described switching tube Q1, second end of described resistance R1 is connected to control end and the outfan of described switching tube Q2 of described switching tube Q1, the input of described switching tube Q1 is connected to 5V positive source, first end of described resistance R2 and the positive pole of described electrochemical capacitor C1, second end of described resistance R2 is connected to control end and first end of described resistance R3 of described switching tube Q2；The negative pole of the input of described switching tube Q2, second end of described resistance R3 and described electrochemical capacitor C1 is connected to the ground.
In conjunction with the first aspect of the application, in the implementation that the second is possible, described control unit includes:
Processor, the output signal that pin is described control unit that controls of described processor controls end, the signal input that sampling pin is described control unit of described processor controls end, the pin that controls of described processor is connected to the signal control end of described DC/DC translation circuit, and the sampling pin of described processor is connected to the signal output part of described current sampling circuit；
The negative electrode of Zener diode U, described Zener diode U is connected to the reference voltage input pin of described processor, and the anode of described Zener diode U is connected to the ground, and is used for producing reference voltage；
Resistance R4, described resistance R4 are connected to the reference voltage of described processor and control between output pin and the reference voltage input pin of described processor, for current limliting, to control the voltage of two grades of U of stabilivolt.
In conjunction with the implementation that the second of the first aspect of the application is possible, in the implementation that the third is possible, described control unit also includes chip drive circuit, the outfan of described chip drive circuit is connected to the chip of described processor and starts pin, the input of described chip drive circuit is connected with the external world, for obtaining extraneous control signal, to start or to close described processor.
In conjunction with the third possible implementation of the first aspect of the application, in the 4th kind of possible implementation, described chip drive circuit includes:
Key switch SW, the input that button is described chip drive circuit of described key switch SW, for receiving the button operation behavior of user, the outfan that outfan is described chip drive circuit of described key switch SW, the chip being connected to described processor starts pin, the ground end ground connection of described key switch SW；
Resistance R5, described resistance R5 are connected to the chip of 5V positive source and described processor and start between pin, and as the pull-up resistor of described key switch SW, the outfan keeping described key switch SW is high level.
In conjunction with any one implementation in the first aspect of the application or the first possible implementation of first aspect to the 4th kind of possible implementation, in the 5th kind of possible implementation, described DC/DC translation circuit includes:
Pulsewidth modulation amplifying circuit, the input of described pulsewidth modulation amplifying circuit is that the signal of described DC/DC translation circuit controls end, and the input of described pulsewidth modulation amplifying circuit is connected to the output signal of described control unit and controls end；
On-off circuit, the input of described on-off circuit is the power input of described DC/DC translation circuit, the input of described on-off circuit is connected to the cathode output end of described low-power consumption regulated power supply, the end that controls of described on-off circuit is connected to the outfan of described pulsewidth modulation amplifying circuit, to receive the pulse-width signal of described pulsewidth modulation amplifying circuit output, and then control being switched on or off of described on-off circuit, by changing dutycycle to export constant electric current；
Inductance L, described inductance L are connected between the outfan of described on-off circuit and the positive pole of described light source, are used for storing energy；
The negative electrode of diode D, described diode D is connected to the outfan of described on-off circuit, and the anode of described diode D is connected to the ground, for afterflow；
Filter circuit, it is made up of electrochemical capacitor C2 and electric capacity C3, for filtering, wherein, the positive pole of described electrochemical capacitor C2 is connected to the positive pole of described light source, the negative pole of described electrochemical capacitor C2 is connected to the anode of described diode D, and described electric capacity C3 is connected between the positive pole of described light source and the anode of described diode D.
In conjunction with the application first aspect the 5th in possible implementation, in the 6th kind of possible implementation, described pulsewidth modulation amplifying circuit includes:
Resistance R6, resistance R7 and switching tube Q3, wherein, first end of described resistance R6 is the input of described pulsewidth modulation amplifying circuit, the outfan of described switching tube Q3 is the outfan of described pulsewidth modulation amplifying circuit, first end of described resistance R6 is connected to the output signal of described control unit and controls end, second end of described resistance R6 is connected to the control end of described switching tube Q3, described resistance R7 is connected between control end and the ground of described switching tube Q3, the input end grounding of described switching tube Q3, the outfan of described switching tube Q3 is connected to the control end of described on-off circuit.
nullThe 6th kind of possible implementation in conjunction with the first aspect of the application，In the 7th kind of possible implementation，Described on-off circuit includes: resistance R8、Resistance R9 and switching tube Q4，Switching tube Q4 controls the control end that end is described on-off circuit，The input that input is described on-off circuit of described switching tube Q4，The outfan that outfan is described on-off circuit of described switching tube Q4，Wherein，First end of described resistance R8 is connected to the input of described switching tube Q4，Second end of described resistance R8 is connected to the control end of described switching tube Q4，First end of described resistance R9 is connected to the second end and the control end of described switching tube Q4 of described resistance R8，Second end of described resistance R9 is connected to the outfan of described switching tube Q3，The outfan of described switching tube Q4 is connected to the negative electrode of described diode D.
In conjunction with in the 7th kind of possible implementation of the first aspect of the application, in the 8th kind of possible implementation, described current sampling circuit includes:
Resistance R10, resistance R11 and electric capacity C4, wherein, the test side that first end is described current sampling circuit of described resistance R10, the signal output part that second end is described current sampling circuit of described resistance R10, first end of described resistance R10 is connected to the negative pole of described light source, second end of described resistance R10 is connected to the sampling pin of described processor, described resistance R11 is connected between negative pole and the ground of described light source, and described electric capacity C4 is connected to the signal input of described control unit and controls between end and ground
The second aspect of the application provides a kind of light fixture, any one drive circuit provided in the several possible embodiment of first aspect that described light fixture includes the application or the first aspect that combines the application.
Above-mentioned drive circuit and light fixture, make when light fixture dormancy by arranging low-power consumption regulated power supply, and the stand-by power consumption of drive circuit is the lowest, saves unnecessary energy expenditure, extends the life-span of light fixture.And, by arranging control unit, current sampling circuit and DC/DC translation circuit, the electric current of the described light source to be obtained according to described current sampling circuit by control unit judges the size of current of described light source, to control described DC/DC translation circuit output stabling current to described light source, improve the stability of lamp circuit, the drive circuit making light fixture meets the reference index of high efficiency and low-power consumption, stable, low in energy consumption and the drive circuit of stand-by time length is provided, it is ensured that the piece electrical efficiency of this drive circuit and light fixture to portable lighting.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the application, the accompanying drawing used required in embodiment will be briefly described below, apparently, accompanying drawing in describing below is only some embodiments of the application, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
A kind of driving circuit structure figure that Fig. 1 provides for the embodiment of the present application；
The structure chart of the another kind of drive circuit that Fig. 2 provides for the embodiment of the present application；
The circuit theory diagrams based on the drive circuit shown in Fig. 2 that Fig. 3 provides for the embodiment of the present application.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described.
Refer to a kind of driving circuit structure figure that Fig. 1, Fig. 1 provide for the embodiment of the present application.As it is shown in figure 1, the drive circuit that the present embodiment provides is used for the electric current stable to light source offer, including: low-power consumption regulated power supply 110, DC/DC translation circuit 120, current sampling circuit 130 and control unit 140.
Wherein, low-power consumption regulated power supply 110, it is used for exporting burning voltage.
The power input of DC/DC translation circuit 120 is connected to the cathode output end of low-power consumption regulated power supply 110, and the outfan of DC/DC translation circuit 120 is connected to the positive pole of light source 150.
The test side of current sampling circuit 130 is connected to the negative pole of light source 150, flows through the electric current of light source 150 for sampling.
The signal input of control unit 140 controls end and is connected to the signal output part of current sampling circuit 130, to obtain the electric current flowing through light source 150, the output signal of control unit 140 controls end and is connected to the signal control end of DC/DC translation circuit 120, the electric current of the light source 150 for obtaining according to current sampling circuit 130 judges the size of current of light source 150, exports stabling current to light source 150 controlling DC/DC translation circuit 120.
The operation principle of the drive circuit that the present embodiment provides is, after circuit powers on, the burning voltage of low-power consumption is exported by low-power consumption regulated power supply 110, the electric current flowing through light source 150 is sampled by the current sampling circuit 130 being connected to light source 150, then sampled signal is exported to control unit 140, so that control unit 140 judges the size of current of light source 150 according to the electric current of the light source 150 obtained, and then control DC/DC translation circuit 120 exports the pulse width modulated wave of different duty, DC/DC translation circuit 120 is so made to export stabling current to light source 150.Concrete, when the electric current flowing through light source 150 obtained in sampled signal is less than the current value preset, control unit 140 increases the dutycycle of output pulse width modulating wave in DC/DC translation circuit 120, if the electric current flowing through light source 150 obtained in sampled signal is more than the current value preset, control unit 140 reduces the dutycycle of DC/DC translation circuit 120 output pulse width modulating wave, so reaches to export stabling current to the purpose of light source 150.
The drive circuit that the present embodiment provides makes when light fixture dormancy by arranging low-power consumption regulated power supply 110, and the stand-by power consumption of drive circuit is the lowest, saves unnecessary energy expenditure, extends the life-span of light fixture.And, by arranging control unit 140, current sampling circuit 130 and DC/DC translation circuit 120, the electric current of the light source 150 to be obtained according to current sampling circuit 130 by control unit 140 judges the size of current of light source 150, stabling current is exported to light source 150 with control DC/DC translation circuit 120, improve the stability of lamp circuit, the drive circuit making light fixture meets the reference index of high efficiency and low-power consumption, provide stable to portable lighting, low in energy consumption and the drive circuit of stand-by time length, ensure that the piece electrical efficiency of this drive circuit and light fixture.
Refer to the structure chart of the another kind of drive circuit that Fig. 2, Fig. 2 provide for the embodiment of the present application.Drive circuit shown in Fig. 2 is the further improvement to the drive circuit shown in Fig. 1.As shown in Figure 2, the drive circuit that the present embodiment provides includes: low-power consumption regulated power supply 110, DC/DC translation circuit 120, current sampling circuit 130 and control unit 140, wherein, control unit 140 includes processor 141, Zener diode U, resistance 142 and chip drive circuit 143, and DC/DC translation circuit 120 includes pulsewidth modulation amplifying circuit 121, on-off circuit 122, inductance L, diode D, the filter circuit that is made up of electrochemical capacitor 123 and electric capacity 124.
Wherein, low-power consumption regulated power supply 110, it is used for exporting burning voltage.
In DC/DC translation circuit 120, the power input of DC/DC translation circuit 120 is connected to the cathode output end of low-power consumption regulated power supply 110, and the outfan of DC/DC translation circuit 120 is connected to the positive pole of light source 150.
Specifically, the input of pulsewidth modulation amplifying circuit 121 is that the signal of DC/DC translation circuit 120 controls end, and the input of pulsewidth modulation amplifying circuit 121 is connected to the output signal of control unit 140 and controls end.The input of on-off circuit 122 is the power input of DC/DC translation circuit 120, the input of on-off circuit 122 is connected to the cathode output end of low-power consumption regulated power supply 110, the end that controls of on-off circuit 122 is connected to the outfan of pulsewidth modulation amplifying circuit 121, to receive the pulse-width signal of pulsewidth modulation amplifying circuit 121 output, and then control being switched on or off of on-off circuit 122, by changing dutycycle to export constant electric current.Inductance L is connected between the outfan of on-off circuit 122 and the positive pole of light source 150, is used for storing energy.The negative electrode of diode D is connected to the outfan of on-off circuit 122, and the anode of diode D is connected to the ground, for afterflow.The filter circuit being made up of electrochemical capacitor 123 and electric capacity 124, for filtering, wherein, the positive pole of electrochemical capacitor 123 is connected to the positive pole of light source 150, the negative pole of electrochemical capacitor 123 is connected to the anode of diode D, and electric capacity C3 is connected between the positive pole of light source 150 and the anode of diode D.
In current sampling circuit 130, the test side of current sampling circuit 130 is connected to the negative pole of light source 150, flows through the electric current of light source 150 for sampling.
In control unit 140, the signal input of control unit 140 controls end and is connected to the signal output part of current sampling circuit 130, to obtain the electric current flowing through light source 150, the output signal of control unit 140 controls end and is connected to the signal control end of DC/DC translation circuit 120, the electric current of the light source 150 for obtaining according to current sampling circuit 130 judges the size of current of light source 150, exports stabling current to light source 150 controlling DC/DC translation circuit 120.
Specifically, the output signal that pin 5 is control unit 140 that controls of processor 141 controls end, the signal input that sampling pin 2 is control unit 140 of processor 141 controls end, the pin 5 that controls of processor 141 is connected to the signal control end of DC/DC translation circuit 120, and the sampling pin 2 of processor 141 is connected to the signal output part of current sampling circuit 130.The negative electrode of Zener diode U is connected to the reference voltage input pin 4 of processor 141, and the anode of Zener diode U is connected to the ground, and is used for producing reference voltage.Resistance 142 is connected to the reference voltage of processor 141 and controls between output pin 3 and the reference voltage input pin 4 of processor 141, for current limliting, to control the voltage of two grades of U of stabilivolt.
The outfan of chip drive circuit 143 is connected to the chip of processor 141 and starts pin 1, and the input of chip drive circuit 143 is connected with the external world, is used for obtaining extraneous control signal, to start or to close processor 141.
The operation principle of the drive circuit that the present embodiment provides is as follows:
After circuit powers on, the burning voltage of low-power consumption is exported by low-power consumption regulated power supply 110, the electric current flowing through light source 150 is sampled by the current sampling circuit 130 being connected to light source 150, then sampled signal is exported to control unit 140, so that control unit 140 judges the size of current of light source 150 according to the electric current of the light source 150 obtained, and then control DC/DC translation circuit 120 exports the pulse width modulated wave of different duty, DC/DC translation circuit 120 is so made to export stabling current to light source 150.
Specifically, DC/DC translation circuit 120 uses BUCK to open up benefit principle, the input current of on-off circuit 122 is provided by pulsewidth modulation amplifying circuit 121, the electric current provided is pulsating current, the dutycycle of pulsating current signal is controlled according to the sampled value obtained from current sampling circuit 130 by the processor 141 in control unit 140, thus the DC/DC translation circuit 120 mending principle by using BUCK to open up exports the electric current that continuous print is stable.
When the electric current flowing through light source 150 obtained in sampled signal is less than the current value preset, the processor 141 of control unit 140 increases the dutycycle of the pulsewidth modulation amplifying circuit 121 output pulse width modulating wave of DC/DC translation circuit 120, if the electric current flowing through light source 150 obtained in sampled signal is more than the current value preset, the processor 141 of control unit 140 reduces the dutycycle of the pulsewidth modulation amplifying circuit 121 output pulse width modulating wave of DC/DC translation circuit 120, so reaches to export stabling current to the purpose of light source 150.
Refer to the circuit theory diagrams based on the drive circuit shown in Fig. 2 that Fig. 3, Fig. 3 provide for the embodiment of the present application.As shown in Figure 3, the drive circuit that the present embodiment provides includes: low-power consumption regulated power supply 110, DC/DC translation circuit 120, current sampling circuit 130 and control unit 140, wherein, low-power consumption regulated power supply 110 includes resistance R1, resistance R2, resistance R3, switching tube Q1, switching tube Q2 and electric capacity C1.Control unit 140 includes processor 141, Zener diode U, resistance R4 and chip drive circuit 143, and chip drive circuit 143 includes key switch SW and resistance R5.DC/DC translation circuit 120 includes pulsewidth modulation amplifying circuit 121, on-off circuit 122, inductance L, diode D, the filter circuit that is made up of electrochemical capacitor C2 and electric capacity C3, pulsewidth modulation amplifying circuit 121 includes resistance R6, resistance R7 and switching tube Q3, and on-off circuit 122 includes resistance R8, resistance R9 and switching tube Q4.Current sampling circuit 130 includes resistance R10, resistance R11 and electric capacity C4.
Wherein, the annexation of each element is as follows:
In low-power consumption regulated power supply 110, the cathode output end that first end is low-power consumption regulated power supply 110 of resistance R1, first end of resistance R1 is connected to the outfan of switching tube Q1, second end of resistance R1 is connected to control end and the outfan of switching tube Q2 of switching tube Q1, the input of switching tube Q1 is connected to 5V positive source, first end of resistance R2 and the positive pole of electrochemical capacitor C1, and second end of resistance R2 is connected to control end and first end of resistance R3 of switching tube Q2；The negative pole of the input of switching tube Q2, second end of resistance R3 and electrochemical capacitor C1 is connected to the ground.In the present embodiment, switching tube Q1, switching tube Q2 are metal-oxide-semiconductor, and grid is all to control end, and its source electrode is all input, and its drain electrode is all outfan.
In control unit 140, the signal input of control unit 140 controls end and is connected to the signal output part of current sampling circuit 130, to obtain the electric current flowing through light source 150, the output signal of control unit 140 controls end and is connected to the signal control end of DC/DC translation circuit 120, the electric current of the light source 150 for obtaining according to current sampling circuit 130 judges the size of current of light source 150, exports stabling current to light source 150 controlling DC/DC translation circuit 120.Specifically, the output signal that pin 5 is control unit 140 that controls of processor 141 controls end, and the signal input that sampling pin 2 is control unit 140 of processor 141 controls end.The pin 5 that controls of processor 141 is connected to the signal control end of DC/DC translation circuit 120, and the sampling pin 2 of processor 141 is connected to the signal output part of current sampling circuit 130.The negative electrode of Zener diode U is connected to the reference voltage input pin 4 of processor 141, and the anode of Zener diode U is connected to the ground, and is used for producing reference voltage.Resistance R4 is connected to the reference voltage of processor 141 and controls between output pin 3 and the reference voltage input pin 4 of processor 141, for current limliting, to control the voltage of two grades of U of stabilivolt.And, the outfan of chip drive circuit 143 is connected to the chip of processor 141 and starts pin 1, and the input of chip drive circuit 143 is connected with the external world, is used for obtaining extraneous control signal, to start or to close processor 141.
Specifically, in chip drive circuit 143, the button of key switch SW is the input of chip drive circuit, for receiving the button operation behavior of user, the outfan of key switch SW is the outfan of chip drive circuit 143, the chip being connected to processor 141 starts pin 1, the ground end ground connection of key switch SW；Resistance R5 is connected to the chip of 5V positive source and processor 141 and starts between pin 1, and as the pull-up resistor of key switch SW, the outfan keeping key switch SW is high level.
In DC/DC translation circuit 120, the power input of DC/DC translation circuit 120 is connected to the cathode output end of low-power consumption regulated power supply 110, and the outfan of DC/DC translation circuit 120 is connected to the positive pole of light source 150.Specifically, the signal that input is DC/DC translation circuit 120 of the pulsewidth modulation amplifying circuit 121 in DC/DC translation circuit controls end, and the input of pulsewidth modulation amplifying circuit 121 is connected to the output signal of control unit 140 and controls end.The input of on-off circuit 122 is the power input of DC/DC translation circuit 120, the input of on-off circuit 122 is connected to the cathode output end of low-power consumption regulated power supply 110, the end that controls of on-off circuit 122 is connected to the outfan of pulsewidth modulation amplifying circuit 121, to receive the pulse-width signal of pulsewidth modulation amplifying circuit 121 output, and then control being switched on or off of on-off circuit 122, by changing dutycycle to export constant electric current.Specifically, inductance L is connected between the outfan of on-off circuit 122 and the positive pole of light source 150, is used for storing energy；The negative electrode of diode D is connected to the outfan of on-off circuit 122, and the anode of diode D is connected to the ground, for afterflow.The filter circuit being made up of electrochemical capacitor C2 and electric capacity C3, for filtering, wherein, the positive pole of electrochemical capacitor C2 is connected to the positive pole of light source 150, the negative pole of electrochemical capacitor C2 is connected to the anode of diode D, and electric capacity C3 is connected between the positive pole of light source 150 and the anode of diode D.
Specifically, in pulsewidth modulation amplifying circuit 121, the input that first end is pulsewidth modulation amplifying circuit 121 of resistance R6, the outfan of switching tube Q3 is the outfan of pulsewidth modulation amplifying circuit 121, first end of resistance R6 is connected to the output signal of control unit 140 and controls end, second end of resistance R6 is connected to the control end of switching tube Q3, resistance R7 is connected between control end and the ground of switching tube Q3, the input end grounding of switching tube Q3, the outfan of switching tube Q3 is connected to the control end of on-off circuit 122.
In on-off circuit 122, the control end that first end is on-off circuit 122 of resistance R8, the input that first end is on-off circuit 122 of resistance R9, the outfan of switching tube Q4 is the outfan of on-off circuit 122, wherein, first end of resistance R8 is connected to the outfan of switching tube Q3, second end of resistance R8 is connected to the control end of switching tube Q4, first end of resistance R9 is connected to the first end and the input of switching tube Q4 of resistance R1, second end of resistance R9 is connected to the control end of switching tube Q4, and the outfan of switching tube Q4 is connected to the negative electrode of diode D.Wherein, switching tube Q3 and switching tube Q4 is metal-oxide-semiconductor, and grid is all to control end, and its source electrode is all input, and its drain electrode is all outfan.
In current sampling circuit 130, the test side that first end is current sampling circuit 130 of resistance R10, the signal output part that second end is current sampling circuit 130 of resistance R10, first end of resistance R10 is connected to the negative pole of light source 150, second end of resistance R10 is connected to the sampling pin 2 of processor 141, resistance R11 is connected between negative pole and the ground of light source 150, and electric capacity C4 is connected to the signal input of control unit 140 and controls between end and ground.
The operation principle of the drive circuit that the present embodiment provides is as follows:
After energising, switching tube Q1 turns on, and resistance R2 and resistance R3 is used for dividing potential drop, to provide driving voltage to switching tube Q2, makes switching tube Q2 turn on, and controls switching tube Q2 and is operated in magnifying state, thus controls to export stable voltage.Starting voltage by the grid of switching tube Q1 and switching tube Q2 makes voltage output tend towards stability as feedback control, and circuit power consumption is minimum.
After the button of key switch SW is depressed by, then processor 141 is driven to start working, to control DC/DC translation circuit 120.
Specifically, DC/DC translation circuit 120 uses BUCK to open up benefit principle, the pulsewidth modulation amplifying circuit 121 that the input current of on-off circuit 122 is made up of resistance R6, R7 and switching tube Q3 provides, for pulsating current, the dutycycle of pulsating current signal is controlled according to the sampled value obtained from current sampling circuit 130 by the processor 141 in control unit 140, thus the DC/DC translation circuit 120 mending principle by using BUCK to open up exports the stable electric current of continuous print to light source 150.
To sum up, after circuit powers on and after the button of key switch SW is depressed by, the burning voltage of low-power consumption is exported by low-power consumption regulated power supply 110, the electric current flowing through light source 150 is sampled by the current sampling circuit 130 being connected to light source 150, then sampled signal is exported to control unit 140, so that control unit 140 judges the size of current of light source 150 according to the electric current of the light source 150 obtained, and then control DC/DC translation circuit 120 exports the pulse width modulated wave of different duty, DC/DC translation circuit 120 is so made to export stabling current to light source 150.Concrete, when the electric current flowing through light source 150 obtained in sampled signal is less than the current value preset, control unit 140 increases the dutycycle of DC/DC translation circuit 120 output pulse width modulating wave, if the electric current flowing through light source 150 obtained in sampled signal is more than the current value preset, control unit 140 reduces the dutycycle of DC/DC translation circuit 120 output pulse width modulating wave, so reaches to export stabling current to the purpose of light source 150.
The drive circuit that the present embodiment provides makes when light fixture dormancy by arranging low-power consumption regulated power supply 110, and the stand-by power consumption of drive circuit is the lowest, saves unnecessary energy expenditure, extends the life-span of light fixture.And, by arranging control unit 140, current sampling circuit 130 and DC/DC translation circuit 120, the electric current of the light source 150 to be obtained according to current sampling circuit 130 by control unit 140 judges to flow through the size of current of light source 150, stabling current is exported to light source 150 with control DC/DC translation circuit 120, improve the stability of lamp circuit, the drive circuit making light fixture meets the reference index of high efficiency and low-power consumption, provide stable to portable lighting, low in energy consumption and the drive circuit of stand-by time length, ensure that the piece electrical efficiency of this drive circuit and light fixture.
Being above the preferred implementation of the application, it is noted that for those skilled in the art, on the premise of without departing from the application principle, it is also possible to make some improvements and modifications, these improvements and modifications are also considered as the protection domain of the application.
Claims (8)
1. a drive circuit, it is characterised in that including:
Low-power consumption regulated power supply, is used for exporting burning voltage；
DC/DC translation circuit, the power input of described DC/DC translation circuit is connected to the cathode output end of described low-power consumption regulated power supply, and the outfan of described DC/DC translation circuit is connected to the positive pole of light source；
Current sampling circuit, the test side of described current sampling circuit is connected to the negative pole of described light source, flows through the electric current of described light source for sampling；
Control unit, the signal input of described control unit controls end and is connected to the signal output part of described current sampling circuit, to obtain the electric current flowing through described light source, the output signal of described control unit controls end and is connected to the signal control end of described DC/DC translation circuit, the electric current of the described light source for obtaining according to described current sampling circuit judges the size of current of described light source, to control described DC/DC translation circuit output stabling current to described light source；
Described DC/DC translation circuit includes pulsewidth modulation amplifying circuit and on-off circuit, the input of described pulsewidth modulation amplifying circuit is that the signal of described DC/DC translation circuit controls end, and the input of described pulsewidth modulation amplifying circuit is connected to the output signal of described control unit and controls end；
Described pulsewidth modulation amplifying circuit includes resistance R6, resistance R7 and switching tube Q3, wherein, first end of described resistance R6 is the input of described pulsewidth modulation amplifying circuit, the outfan of described switching tube Q3 is the outfan of described pulsewidth modulation amplifying circuit, first end of described resistance R6 is connected to the output signal of described control unit and controls end, second end of described resistance R6 is connected to the control end of described switching tube Q3, described resistance R7 is connected between control end and the ground of described switching tube Q3, the input end grounding of described switching tube Q3, the outfan of described switching tube Q3 is connected to the control end of described on-off circuit.
2. drive circuit as claimed in claim 1, it is characterised in that described control unit includes:
Processor, the output signal that pin is described control unit that controls of described processor controls end, the signal input that sampling pin is described control unit of described processor controls end, the pin that controls of described processor is connected to the signal control end of described DC/DC translation circuit, and the sampling pin of described processor is connected to the signal output part of described current sampling circuit；
The negative electrode of Zener diode U, described Zener diode U is connected to the reference voltage input pin of described processor, and the anode of described Zener diode U is connected to the ground, and is used for producing reference voltage；
Resistance R4, described resistance R4 are connected to the reference voltage of described processor and control between output pin and the reference voltage input pin of described processor, for current limliting, to control the voltage of two grades of U of stabilivolt.
3. drive circuit as claimed in claim 2, it is characterized in that, described control unit also includes chip drive circuit, the outfan of described chip drive circuit is connected to the chip of described processor and starts pin, the input of described chip drive circuit is connected with the external world, for obtaining extraneous control signal, to start or to close described processor.
4. drive circuit as claimed in claim 3, it is characterised in that described chip drive circuit includes:
Key switch SW, the input that button is described chip drive circuit of described key switch SW, for receiving the button operation behavior of user, the outfan that outfan is described chip drive circuit of described key switch SW, the chip being connected to described processor starts pin, the ground end ground connection of described key switch SW；
Resistance R5, described resistance R5 are connected to the chip of 5V positive source and described processor and start between pin, and as the pull-up resistor of described key switch SW, the outfan keeping described key switch SW is high level.
5. the drive circuit as described in arbitrary in Claims 1-4, it is characterized in that, the input of described on-off circuit is the power input of described DC/DC translation circuit, the input of described on-off circuit is connected to the cathode output end of described low-power consumption regulated power supply, the end that controls of described on-off circuit is connected to the outfan of described pulsewidth modulation amplifying circuit, to receive the pulse-width signal of described pulsewidth modulation amplifying circuit output, and then control being switched on or off of described on-off circuit, by changing dutycycle to export constant electric current；
Described DC/DC translation circuit also includes that inductance L, described inductance L are connected between the outfan of described on-off circuit and the positive pole of described light source, are used for storing energy；
The negative electrode of diode D, described diode D is connected to the outfan of described on-off circuit, and the anode of described diode D is connected to the ground, for afterflow；
Filter circuit, it is made up of electrochemical capacitor C2 and electric capacity C3, for filtering, wherein, the positive pole of described electrochemical capacitor C2 is connected to the positive pole of described light source, the negative pole of described electrochemical capacitor C2 is connected to the anode of described diode D, and described electric capacity C3 is connected between the positive pole of described light source and the anode of described diode D.
6. drive circuit as claimed in claim 5, it is characterized in that, described on-off circuit includes: resistance R8, resistance R9 and switching tube Q4, switching tube Q4 controls the control end that end is described on-off circuit, the input that input is described on-off circuit of described switching tube Q4, the outfan that outfan is described on-off circuit of described switching tube Q4, first end of described resistance R8 is connected to the input of described switching tube Q4, second end of described resistance R8 is connected to the control end of described switching tube Q4, first end of described resistance R9 is connected to the second end and the control end of described switching tube Q4 of described resistance R8, second end of described resistance R9 is connected to the outfan of described switching tube Q3, the outfan of described switching tube Q4 is connected to the negative electrode of described diode D.
7. drive circuit as claimed in claim 6, it is characterised in that described current sampling circuit includes:
Resistance R10, resistance R11 and electric capacity C4, wherein, the test side that first end is described current sampling circuit of described resistance R10, the signal output part that second end is described current sampling circuit of described resistance R10, first end of described resistance R10 is connected to the negative pole of described light source, second end of described resistance R10 is connected to the sampling pin of described processor, described resistance R11 is connected between negative pole and the ground of described light source, and described electric capacity C4 is connected to the signal input of described control unit and controls between end and ground.
8. a light fixture, it is characterised in that include the drive circuit as described in arbitrary in claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210497271.3A CN103857101B (en) | 2012-11-29 | 2012-11-29 | A kind of drive circuit and light fixture |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210497271.3A CN103857101B (en) | 2012-11-29 | 2012-11-29 | A kind of drive circuit and light fixture |
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| CN103857101A CN103857101A (en) | 2014-06-11 |
| CN103857101B true CN103857101B (en) | 2016-08-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104252840B (en) * | 2014-09-11 | 2017-01-18 | 天津三星电子有限公司 | Driving circuit |
| CN106602871A (en) * | 2016-11-18 | 2017-04-26 | 全椒县志宏机电设备设计有限公司 | Constant-current backlight power source circuit, power source device and display |
| CN110113842B (en) * | 2019-05-21 | 2024-03-05 | 江苏宜美照明科技股份有限公司 | Ambient light induction control lamp switch circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1904790A (en) * | 2005-07-25 | 2007-01-31 | 鸿富锦精密工业（深圳）有限公司 | Output adjustable voltage stabilizing power circuit |
| CN102548171A (en) * | 2010-12-22 | 2012-07-04 | 海洋王照明科技股份有限公司 | Control circuit of emergency lamp |
| CN102740538A (en) * | 2011-04-13 | 2012-10-17 | 海洋王照明科技股份有限公司 | Led drive circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007048656A (en) * | 2005-08-11 | 2007-02-22 | Toshiba Lighting & Technology Corp | Discharge lamp lighting device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1904790A (en) * | 2005-07-25 | 2007-01-31 | 鸿富锦精密工业（深圳）有限公司 | Output adjustable voltage stabilizing power circuit |
| CN102548171A (en) * | 2010-12-22 | 2012-07-04 | 海洋王照明科技股份有限公司 | Control circuit of emergency lamp |
| CN102740538A (en) * | 2011-04-13 | 2012-10-17 | 海洋王照明科技股份有限公司 | Led drive circuit |
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