CN102611328B - Low-power consumption isolation-free DC power supply - Google Patents
Low-power consumption isolation-free DC power supply Download PDFInfo
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- CN102611328B CN102611328B CN201210056444.8A CN201210056444A CN102611328B CN 102611328 B CN102611328 B CN 102611328B CN 201210056444 A CN201210056444 A CN 201210056444A CN 102611328 B CN102611328 B CN 102611328B
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Abstract
The invention discloses a low-power consumption isolation-free DC power supply which comprises a bridge type rectifier circuit, a sampling and segmenting circuit, a current limit switch, a filter and a constant current, wherein AC is converted into pulsating DC through the bridge type rectifier circuit, the current limit switch is controlled through the sampling and segmenting circuit for charging and filtering a filter capacitor C in the filter, and mini ripple waves are eliminated through the constant current when the filter capacitor C discharges, and DC is output. According to the invention, the AC is rectified through the bridge type rectifier circuit to obtain the pulsating DC, the pulsating DC is sampled and segmented, the current limit switch is controlled for carrying out limited charging on the filter capacitor, and the DC is obtained after the filter capacitor passes through a constant current circuit during charging. The low-power consumption isolation-free DC power supply without PWM (Pulse Width Modulation) voltage stabilization control, transformer or inductance, which is designed according to the characteristic of sine waves, is simple and direct in AC-DC conversion, and has the conversion efficiency of reaching above 90 percent.
Description
Technical field
The present invention relates to a kind of LED driving power, especially a kind of for the low-power consumption on LED without isolated DC power supply.
Background technology
At present, energy-conservation and to economize on resources be one of technical field that in development of world economy, tool determines power and influence power, and the universal of LED illumination is the developing stage that lighting field is new, but there is more weak point in current LED driving power, all the more so while driving great power LED, because all not as the power of light output all as heat dissipation, power supply conversion efficiency too low, has affected the performance of LED energy-saving effect.
The step-down mode of LED driving power, classify and have by circuit structure mode:
1, resistance, capacitance decompression mode: by capacitance decompression, flashing while using, due to the effect discharging and recharging, very big by the immediate current of LED, easily defective chip, is subject to the impact of voltage ripple of power network, and power-efficient is low, reliability is low.
2, resistance step-down mode: by resistance step-down, be subject to the interference of grid voltage change larger, be not easy to make stabilized voltage power supply, dropping resistor will consume very most energy, so this supply power mode power-efficient is very low, and system is reliable also lower.
3, conventional transformer step-down mode: power volume is little, weight lays particular stress on, power-efficient also very low, generally only have 45%～60%, so general little use, reliability is not high.
4, electronic transformer step-down mode: power-efficient is lower, voltage range is not wide yet, general 180～240V, moire disturbance is large.
5, RCC step-down mode switch power supply: voltage stabilized range is wider, power-efficient is higher, generally can accomplish 70%～80%, applies also wider.Because the frequency of oscillation of this control mode is discontinuous, switching frequency is not easy to control, and load voltage ripple coefficient is also larger, abnormal load bad adaptability.
6, PWM control mode Switching Power Supply: mainly formed input rectifying filtering part, output rectification filter part, PWM voltage stabilizing control section, switch power conversion part by four parts.The basic functional principle of PWM switch voltage-stabilizing is exactly in the situation that input voltage, inner parameter and external load change, control circuit carries out closed loop feedback by the difference of controlled signal and reference signal, the pulse duration that regulates main circuit switch break-over of device, making the output voltage of Switching Power Supply or current stabilization is corresponding stabilized voltage power supply or constant-current supply.PWM control mode Switching Power Supply is the LED driving power of relative ideal, but the circuit complexity of PWM control mode Switching Power Supply, and the deficiency such as cost of manufacture is high, consumes resources, causes LED illumination because price is far above other illuminating products and can not large area universal.
Summary of the invention
The present invention will solve the shortcoming of above-mentioned prior art, provide a kind of low-power consumption without isolated DC power supply, whole circuit comprises rectification, sampling, cutting, current limiting switch, filtering and six parts of constant current, and the mode of isolating by nothing is converted into direct current by alternating current.
The present invention solves the technical scheme that its technical problem adopts: this low-power consumption is without isolated DC power supply, comprise bridge rectifier, sampling and cutting circuit, current limiting switch and filtering and constant current, alternating current is converted to Rectified alternating current by bridge rectifier, through sampling and cutting circuit control current limiting switch, the filter capacitor C in filtering is charged and filtering, when filter capacitor C electric discharge, eliminate small ripple by constant current and export direct current; Cutting circuit is by the 3rd resistance R
3, the 5th resistance R
5, the 7th NPN type triode V
7, the 8th positive-negative-positive triode V
8with the tenth voltage stabilizing didoe V
10composition; The 3rd resistance R
3one end be connected with positive pulsating direct current output, the other end respectively with the second field effect transistor VT
2grid, the 5th resistance R
5, the 8th positive-negative-positive triode V
8emitter, the tenth voltage stabilizing didoe V
10positive pole, current limiting switch be connected, the 7th NPN type triode V
7, the 8th positive-negative-positive triode V
8the combination of composition Darlington, the 7th NPN type triode V
7collector electrode, the 8th positive-negative-positive triode V
8base stage and the 5th resistance R
5the other end be connected, the 7th NPN type triode V
7base stage 2 be connected with sampling, the 7th NPN type triode V
7emitter, the 8th positive-negative-positive triode V
8collector electrode be connected with negative ripple DC output end, the tenth voltage stabilizing didoe V
10negative pole be connected with negative ripple DC output end.
Bridge rectifier is by four rectifier diode V
1-V
4composition; The first rectifier diode V
1positive pole, the 3rd rectifier diode V
3negative pole be connected with the input of alternating current, the second rectifier diode V
2positive pole, the 4th rectifier diode V
4negative pole be connected with another input of alternating current, the first rectifier diode V
1, the second rectifier diode V
2negative pole be connected to form the positive pulsating direct current output of bridge rectifier 1, the 3rd rectifier diode V
3, the 4th rectifier diode V
4positive pole be connected to form the negative ripple DC output end of bridge rectifier; Positive pulsating direct current output is connected with sampling, direct current positive output end, filtering, and negative ripple DC output end is connected with sampling, cutting circuit, current limiting switch.
Sampling is by the first resistance R
1, the 6th resistance R
6with the 7th resistance R
7be composed in series successively; The first resistance R
1one end connects positive pulsating direct current output, the 7th resistance R
7one end connects negative ripple DC output end, by the first resistance R
1with the 6th resistance R
6the contact of composition is the output of sampling.
The 7th resistance R
7can be fixed value resistance, can be also variable resistor.
Current limiting switch 4 is by the second field effect transistor VT
2, the 9th NPN type triode V
9with the 8th resistance R
8composition; The second field effect transistor VT
2drain electrode connect the negative pole of filter capacitor, the second field effect transistor VT
2source electrode connect the 8th resistance R
8with the 9th NPN type triode V
9base stage, the 9th NPN type triode V
9collector electrode meet the second field effect transistor VT
2grid, the 9th NPN type triode V
9emitter and the 8th resistance R
8another termination negative ripple DC output end.
Filtering 5 is electrochemical capacitor C, and the positive pole of electrochemical capacitor C is connected with positive pulsating direct current output, the negative pole of electrochemical capacitor C and the second field effect transistor VT
2drain electrode be connected with constant current 6.
Constant current 6 is by the second resistance R
2, the 4th resistance R
4, the 5th voltage stabilizing didoe V
5, the 6th NPN type triode V
6with the first field effect transistor VT
1composition; The second resistance R
2one end be connected with positive pulsating direct current output, another termination the 5th voltage stabilizing didoe V
5positive pole, the 6th NPN type triode V
6collector electrode and the first field effect transistor VT
1grid, the first field effect transistor VT
1source electrode meet the 6th NPN type triode V
6base stage, the 4th resistance R
4, the 4th resistance R
4the other end and the 5th voltage stabilizing didoe V
5negative pole, the 6th NPN type triode V
6the negative pole of emitter, filter capacitor C is connected, the first field effect transistor VT
1drain electrode and positive pulsating direct current output form respectively negative pole and the positive pole of DC power supply.
Constant current is by resistance one * R
1, resistance two * R
2, a NPN type triode V
11with the 2nd NPN type triode V
12composition, resistance one * R
1with a NPN type triode V
11collector electrode be connected to the input of little electric current constant current, resistance one * R
1the other end and a NPN type triode V
11base stage, the 2nd NPN type triode V
12collector electrode be connected, a NPN type triode V
11emitter and the 2nd NPN type triode V
12base stage, resistance two * R
2be connected, the 2nd NPN type triode V
12emitter and resistance two * R
2the other end be connected to the output of little electric current constant current.
Constant current is by resistance one * R
1, resistance two * R
2, the first positive-negative-positive triode V
13with the second positive-negative-positive triode V
14composition, resistance one * R
1with the first positive-negative-positive triode V
13collector electrode be connected to the output of little electric current constant current, resistance one * R
1the other end and the first positive-negative-positive triode V
13base stage, the second positive-negative-positive triode V
14collector electrode be connected, the first positive-negative-positive triode V
13emitter and the second positive-negative-positive triode V
14base stage, resistance two * R
2be connected, the second positive-negative-positive triode V
14emitter and resistance two * R
2the other end be connected to the input of little electric current constant current.
The triode that NPN type triode is made up of P type semiconductor of 2 N type semiconductor sandwich, the triode that positive-negative-positive triode is made up of 1 N type semiconductor of two P type semiconductor sandwich.
The effect that the present invention is useful is: alternating current of the present invention obtains Rectified alternating current after bridge rectifier, Rectified alternating current is sampled to cutting control current limiting switch filter capacitor is carried out to limited charging, when filter capacitor electric discharge, after constant-current circuit, obtain direct current.This low-power consumption without PWM voltage stabilizing control, transless or inductance designing according to sinusoidal wave feature is without isolated DC electricity, and AC-DC conversion is simply direct, and conversion efficiency can be accomplished more than 90%; Can be supporting with the LED lamp of multiple situation, be particularly suitable for the high-power LED driving power source of high voltage.The direct current of direct current output is reliable and stable, the wide accommodation of circuit to alternating voltage, circuit is radiationless, high efficiency, volume are little, to environmental resource close friend, make simple, cost is low, output voltage is adjustable, the direct current of output can be opened a way or instantaneous short circuit can not affect the safety of circuit or electrical network, large area is used this power supply also can not work the mischief to electrical network, safe, reliable and stable when circuit self work.Driving power that can corresponding LED lamp carries out the design of specific aim coupling, has maximum efficiency, and have safety and stability while making it work.
Brief description of the drawings
Fig. 1 is theory diagram of the present invention;
Fig. 2 is circuit diagram of the present invention;
Fig. 3 is cutting line chart of the present invention;
Fig. 4 is the pulsating direct current oscillogram after cutting of the present invention;
Fig. 5 is cutting filtering direct current output waveform figure of the present invention;
Fig. 6 is R in Fig. 2
6+ R
7resistance less or trend towards the simplification circuit theory diagrams of 1 o'clock;
Fig. 7 works as the direct current of constant current requirement compared with the circuit in the B region in hour replacement Fig. 2;
Fig. 8 is the another kind of form of small-power constant-current circuit.
Description of reference numerals: bridge rectifier 1, sampling 2, cutting circuit 3, current limiting switch 4, filtering 5, constant current 6.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
With reference to accompanying drawing: this low-power consumption is without isolated DC power supply, comprise bridge rectifier 1, sampling 2 and cutting circuit 3, current limiting switch 4 and filtering 5 and constant current 6, alternating current is converted to Rectified alternating current by bridge rectifier 1, process sampling 2 and cutting circuit 3 are controlled current limiting switch 4 the filter capacitor C in filtering 5 are charged and filtering, eliminate small ripple export direct current when filter capacitor C electric discharge by constant current 6.
Bridge rectifier 1 is by four rectifier diode V
1-V
4composition; The first rectifier diode V
1positive pole, the 3rd rectifier diode V
3negative pole be connected with the input of alternating current, the second rectifier diode V
2positive pole, the 4th rectifier diode V
4negative pole be connected with another input of alternating current, the first rectifier diode V
1, the second rectifier diode V
2negative pole be connected to form the positive pulsating direct current output of bridge rectifier 1, the 3rd rectifier diode V
3, the 4th rectifier diode V
4positive pole be connected to form the negative ripple DC output end of bridge rectifier 1; Positive pulsating direct current output is connected with sampling 2, direct current positive output end, filtering 5, and negative ripple DC output end is connected with sampling 2, cutting circuit 3, current limiting switch 4.
Sampling 2 is by the first resistance R
1, the 6th resistance R
6with the 7th resistance R
7be composed in series successively; The first resistance R
1one end connects positive pulsating direct current output, the 7th resistance R
7one end connects negative ripple DC output end, by the first resistance R
1with the 6th resistance R
6the contact of composition is the output of sampling 2.
The 7th resistance R
7can be fixed value resistance, can be also variable resistor.
Cutting circuit 3 is by the 3rd resistance R
3, the 5th resistance R
5, the 7th NPN type triode V
7, the 8th positive-negative-positive triode V
8with the tenth voltage stabilizing didoe V
10composition; The 3rd resistance R
3one end be connected with positive pulsating direct current output, the other end respectively with the second field effect transistor VT
2grid, the 5th resistance R
5, the 8th positive-negative-positive triode V
8emitter, the tenth voltage stabilizing didoe V
10positive pole, current limiting switch 4 be connected, the 7th NPN type triode V
7, the 8th positive-negative-positive triode V
8the combination of composition Darlington, the 7th NPN type triode V
7collector electrode, the 8th positive-negative-positive triode V
8base stage and the 5th resistance R
5the other end be connected, the 7th NPN type triode V
7base stage 2 be connected with sampling, the 7th NPN type triode V
7emitter, the 8th positive-negative-positive triode V
8collector electrode be connected with negative ripple DC output end, the tenth voltage stabilizing didoe V
10negative pole be connected with negative ripple DC output end.
Current limiting switch 4 is by the second field effect transistor VT
2, the 9th NPN type triode V
9with the 8th resistance R
8composition; The second field effect transistor VT
2drain electrode connect the negative pole of filter capacitor, the second field effect transistor VT
2source electrode connect the 8th resistance R
8with the 9th NPN type triode V
9base stage, the 9th NPN type triode V
9collector electrode meet the second field effect transistor VT
2grid, the 9th NPN type triode V
9emitter and the 8th resistance R
8another termination negative ripple DC output end.
Filtering 5 is electrochemical capacitor C, and the positive pole of electrochemical capacitor C is connected with positive pulsating direct current output, the negative pole of electrochemical capacitor C and field effect transistor VT
2drain electrode be connected with constant current 6.
Constant current 6 is by the second resistance R
2, the 4th resistance R
4, the 5th voltage stabilizing didoe V
5, the 6th NPN type triode V
6with the first field effect transistor VT
1composition; The second resistance R
2one end be connected with positive pulsating direct current output, another termination the 5th voltage stabilizing didoe V
5positive pole, the 6th NPN type triode V
6collector electrode and the first field effect transistor VT
1grid, the first field effect transistor VT
1source electrode meet the 6th NPN type triode V
6base stage, the 4th resistance R
4, the 4th resistance R
4the other end and the 5th voltage stabilizing didoe V
5negative pole, the 6th NPN type triode V
6emitter is connected with the negative pole of filter capacitor C, the first field effect transistor VT
1drain electrode and positive pulsating direct current output form respectively negative pole and the positive pole of DC power supply.
Constant current 6 is by resistance one * R
1, resistance two * R
2, a NPN type triode V
11with the 2nd NPN type triode V
12composition, resistance one * R
1with a NPN type triode V
11collector electrode be connected to the input of little electric current constant current, resistance one * R
1the other end and a NPN type triode V
11base stage, the 2nd NPN type triode V
12collector electrode be connected, a NPN type triode V
11emitter and the 2nd NPN type triode V
12base stage, resistance two * R
2be connected, the 2nd NPN type triode V
12emitter and resistance two * R
2the other end be connected to the output of little electric current constant current.
Constant current 6 is by resistance one * R
1, resistance two * R
2, the first positive-negative-positive triode V
13with the second positive-negative-positive triode V
14composition, resistance one * R
1with the first positive-negative-positive triode V
13collector electrode be connected to the output of little electric current constant current, resistance one * R
1the other end and the first positive-negative-positive triode V
13base stage, the second positive-negative-positive triode V
14collector electrode be connected, the first positive-negative-positive triode V
13emitter and the second positive-negative-positive triode V
14base stage, resistance two * R
2be connected, the second positive-negative-positive triode V
14emitter and resistance two * R
2the other end be connected to the input of little electric current constant current.
As shown in Figure 1, alternating current obtains Rectified alternating current after bridge rectifier, Rectified alternating current is sampled to cutting control current limiting switch filter capacitor is carried out to limited charging, obtains direct current when filter capacitor electric discharge after constant-current circuit.This low-power consumption without PWM voltage stabilizing control, transless or inductance designing according to sinusoidal wave feature is without isolated DC power supply, and AC-DC conversion is simply direct, and general efficiency can be accomplished more than 90%; Can be supporting with the LED lamp of multiple situation, be particularly suitable for the high-power LED driving power source of high voltage.
In circuit shown in accompanying drawing 2, eight contacts wherein indicating with eight letters of a-h, this partial circuit surrounding can carry out integrated, is convenient to batch production and produces, and further reduce production costs.Wherein input AC electricity is through the rectification of bridge rectifier 1, by the first rectifier diode V
1, the second rectifier diode V
2positive pole be connected to form the positive pulsating direct current output of bridge rectifier 1, the 3rd rectifier diode V
3, the 4th rectifier diode V
4negative pole be connected to form the negative ripple DC output end of bridge rectifier 1; Positive and negative Rectified alternating current is added in the two ends of sample circuit, and in the time that the voltage changing reaches the magnitude of voltage of segmentation lines A, cutting circuit is opened, by the field effect transistor VT in current limiting switch circuit
2turn-off, although pulsating dc voltage continues to raise, and filter capacitor stops charging, and the voltage of filter capacitor no longer raises, when the voltage changing reaches the magnitude of voltage of segmentation lines A and when following, cutting circuit is closed, the field effect transistor VT in current limiting switch circuit thereupon
2open filter capacitor charging; If when the charging current of filter capacitor reaches Limited Current, the NPN type triode V in current limiting switch circuit
9open, make field effect transistor VT
2grid voltage decline, the electric current that flows through filter capacitor keeps constant, reaches the object of current-limiting protection.Always there is certain ripple in filter capacitor, design adds after constant-current circuit, just can ensure that the direct current maintenance of exporting is constant, meanwhile, can also eliminate ripple in the time discharging and recharging, though moment output short-circuit also can ensure the safety of power supply.The alternating voltage of no matter inputting is high or low, draws as long as be split line after rectification, all will be controlled by current limiting switch, makes the charging voltage of filter capacitor keep certain certain value, and therefore, power supply is also safe in open-circuit condition.In the power circuit of this invention, rectifier diode V
1-V
4, filter capacitor, the second field effect transistor VT
2the common upper voltage limit that determines input AC electricity.The circuit of this invention also possesses following feature, and when requiring, the direct voltage of output is lower, and the alternating voltage lower limit of input is lower, and scope is wider; Otherwise the direct voltage of output is higher when requiring, the lower limit of the alternating voltage of input is also higher, and scope is less.
Accompanying drawing 3 is to regulate R
7segmentation lines A in the time of a certain resistance, the 7th resistance R
7when increase, segmentation lines moves down, the 7th resistance R
7while reducing, in segmentation lines, move; When segmentation lines A moves down, the opening time of current limiting switch shortens, and the pulsating dc voltage of institute's cutting also synchronously declines, and the charging voltage of filter capacitor also declines thereupon; While moving on segmentation lines A, the opening time of current limiting switch extends, and the pulsating dc voltage of institute's cutting also synchronously rises, and the charging voltage of filter capacitor also rises thereupon.Press and electric current the 7th resistance R if obtain a certain galvanic current
7become a certain fixed value resistance.
Accompanying drawing 4 is while replacing filter capacitor with pure resistor load, the oscillogram in load; Hence one can see that, and the power of the lower direct current output in position of segmentation lines A is less, otherwise the power of the higher direct current output in position of segmentation lines A is larger; If will export larger power in the position that segmentation lines is lower, the efficiency of power supply will decline, the second field effect transistor VT of current limiting switch
2also can generate heat, radiation fin is not with regard to entail dangers to the second field effect transistor VT
2safety.
In accompanying drawing 5, dotted line A is segmentation lines, broken line Uc
1the oscillogram that filter capacitor discharges and recharges, straight line Uc
2it is the direct current of output; Hence one can see that, and under the certain condition of segmentation lines, the capacity of filter capacitor will match with load, the too low meeting of load both end voltage causes the fluctuation discharging and recharging of filter capacitor to increase, the decrease in efficiency of power supply, or the pressure drop of constant-current circuit is excessive, causes field effect transistor VT
1generate heat, affect the efficiency of power supply; The too high meeting of load both end voltage causes output power of power supply deficiency, and load, if LED lamp can cause stroboscopic, affects illuminating effect.In the time of actual fabrication, the operating voltage of LED lamp can be regarded straight line Uc approx as
2, and the pressure drop of constant-current circuit is exactly segmentation lines A and straight line Uc
2between mean value.
Fig. 6 is developed and next special shape by Fig. 2, works as R
6+ R
7resistance less or trend towards at 1 o'clock, sampling and cutting circuit will lose effect, Fig. 2 circuit A area circuit does not produce effect, Fig. 2 circuit just becomes the circuit shown in Fig. 6.The VD of Fig. 6 circuit is about U
0=1.414Ui, in the time that alternating voltage is 220V, U
0for 310V, adjust corresponding resistance R, can change power output, the parameter of indicating in Fig. 6 circuit is the LED constant-flow driver that about 90W constant current output direct voltage is about 300V, it is to be relatively easy to that this circuit will be made great power LED constant-flow driver.
Fig. 7 is the circuit of constant current 6 parts for replacing the B region in Fig. 2, and the direct current requiring when constant current 6 hour, can adopt two NPN type triodes combinations, realizes small-power output, as long as adjust the R in Fig. 7 circuit
1, R
2resistance.Constant current 6 parts are by resistance one * R
1, resistance two * R
2, a NPN type triode V
11with the 2nd NPN type triode V
12composition, resistance one * R
1with a NPN type triode V
11collector electrode be connected to the input of little electric current constant current, resistance one * R
1the other end and a NPN type triode V
11base stage, the 2nd NPN type triode V
12collector electrode be connected, a NPN type triode V
11emitter and the 2nd NPN type triode V
12base stage, resistance two * R
2be connected, the 2nd NPN type triode V
12emitter and resistance two * R
2the other end be connected to the output of little electric current constant current.
Fig. 8 is the another kind of form of small-power constant-current circuit, adopts two positive-negative-positive triode combinations, and its principle is identical with Fig. 7 circuit.Constant current 6 is by resistance one * R
1, resistance two * R
2, the first positive-negative-positive triode V
13with the second positive-negative-positive triode V
14composition, resistance one * R
1with the first positive-negative-positive triode V
13collector electrode be connected to the output of little electric current constant current, resistance one * R
1the other end and the first positive-negative-positive triode V
13base stage, the second positive-negative-positive triode V
14collector electrode be connected, the first positive-negative-positive triode V
13emitter and the second positive-negative-positive triode V
14base stage, resistance two * R
2be connected, the second positive-negative-positive triode V
14emitter and resistance two * R
2the other end be connected to the input of little electric current constant current.
It can be seen from the above, changes part of circuit or reduce part of circuit all not change general principle of the present invention.
The circuit theory of accompanying drawing 2 according to the present invention, while making 80V direct current:
V
1-V
4with 1N4007, R
1, R
2and R
36.8M, R
427, R
5120K, R
640K, R
710K, R
80.5, V
5, V
10the voltage stabilizing didoe of 12V, V
6, V
7and V
99014, V
89015, VT
1iRF640, VT
2be IRF840, C is the electrochemical capacitor of 100uF/100V; When the alternating voltage of input is within the scope of 60-280V time, just can obtain the direct current of 80V, 20mA, conversion efficiency is more than 90%.If increase power output, can regulate R
7, make R
7resistance diminish, simultaneously R
4resistance also want corresponding reducing, when operation, to note making VT
1pressure drop between 3-6V, VT
2temperature rise can not be too high; In improving power output, conversion efficiency can decline to some extent.
The circuit theory of accompanying drawing 2 according to the present invention, while making 220V direct current:
The galvanic making of 220V and the galvanic making of 80V are similar, and just to change into be the electrochemical capacitor of 200uF/250V to filter capacitor C, R
6changing into is the resistance of 14K; When the alternating voltage of input is within the scope of 160-280V time, just can obtain the direct current of 220V, 20mA, conversion efficiency is more than 97%.If increase power output, can regulate R
7, make R
7resistance diminish, simultaneously R
4resistance also want corresponding reducing, when operation, to note making VT
1pressure drop between 3-6V, VT
2temperature rise can not be too high; In improving power output, conversion efficiency can decline to some extent.If the power output of this circuit is further increased, do not reduce again conversion efficiency simultaneously, to change V
1-V
4, VT
2, C, R
4and R8, V
1-V
4adopt the larger rectifier diode of electric current, VT
2can use 20N60C3, the capacity of C will increase, R
4and R
8all want corresponding reducing.If the output voltage of this circuit is further raise, do not reduce again conversion efficiency simultaneously, to change R
6, make R
6resistance diminish, the withstand voltage increase of filter capacitor will be mated with the operating voltage of LED lamp simultaneously.
In electronic circuit, as long as di/dt or du/dt are not equal to zero, capital produces electromagnetic noise, and electromagnetic noise is the major part of electromagnetic interference source, pulsewidth is less than disturbing pulse or the transition noise of 1 microsecond, and the duration sustained sound that is greater than 10 nanoseconds, the most easily cause fault or the stoppage in transit of electronic equipment, wherein the most serious is the break-make of inductive load.Therefore, the power inverter of pulse-width modulation, operating frequency, between 20KHz-2000KHz, has comprised again core transformers and filter inductance, and hence one can see that, and the power inverter of PWM work is the emission source of EMI maximum.
Low-power consumption does not adopt the method for PWM voltage stabilizing control without isolated DC electricity, do not comprise any inductance component, also do not comprise the power device of high-frequency work, therefore exempted the switching loss of high-frequency power device and the loss of transformer, efficiency will be higher than traditional power circuit; Because all components and parts in circuit are all operated in the frequency of 50Hz, can not produce electromagnetic interference to subscriber equipment or electrical network.
Although the present invention illustrates and describes by reference to preferred embodiment,, those skilled in the art should understand, and in the scope of claims, can do the various variation in form and details.
Claims (3)
1. a low-power consumption is without isolated DC power supply, comprise bridge rectifier (1), sampling (2) and cutting circuit (3), current limiting switch (4) and filtering (5) and constant current (6), it is characterized in that: alternating current is converted to Rectified alternating current by bridge rectifier (1), through sampling (2) and cutting circuit (3) control current limiting switch (4), the filter capacitor (C) in filtering (5) is charged and filtering, when filter capacitor (C) electric discharge, eliminate small ripple by constant current (6) and export direct current; Described cutting circuit (3) is by the 3rd resistance (R
3), the 5th resistance (R
5), the 7th NPN type triode (V
7), the 8th positive-negative-positive triode (V
8) and the tenth voltage stabilizing didoe (V
10) composition; The 3rd resistance (R
3) one end be connected with positive pulsating direct current output, the other end respectively with the second field effect transistor (VT
2) grid, the 5th resistance (R
5), the 8th positive-negative-positive triode (V
8) emitter, the tenth voltage stabilizing didoe (V
10) positive pole, current limiting switch (4) be connected, the 7th NPN type triode (V
7), the 8th positive-negative-positive triode (V
8) combination of composition Darlington, the 7th NPN type triode (V
7) collector electrode, the 8th positive-negative-positive triode (V
8) base stage and the 5th resistance (R
5) the other end be connected, the 7th NPN type triode (V
7) base stage be connected with sampling (2), the 7th NPN type triode (V
7) emitter, the 8th positive-negative-positive triode (V
8) collector electrode be connected with negative ripple DC output end, the tenth voltage stabilizing didoe (V
10) negative pole be connected with negative ripple DC output end; Described bridge rectifier (1) is by four rectifier diode (V
1-V
4) composition; The first rectifier diode (V
1) positive pole, the 3rd rectifier diode (V
3) negative pole be connected with the input of alternating current, the second rectifier diode (V
2) positive pole, the 4th rectifier diode (V
4) negative pole be connected with another input of alternating current, the first rectifier diode (V
1), the second rectifier diode (V
2) negative pole be connected to form the positive pulsating direct current output of bridge rectifier (1), the 3rd rectifier diode (V
3), the 4th rectifier diode (V
4) positive pole be connected to form the negative ripple DC output end of bridge rectifier (1); Positive pulsating direct current output is connected with sampling (2), direct current positive output end, filtering (5), and negative ripple DC output end is connected with sampling (2), cutting circuit (3), current limiting switch (4); Described sampling (2) is by the first resistance (R
1), the 6th resistance (R
6) and the 7th resistance (R
7) be composed in series successively; The first resistance (R
1) one end connects positive pulsating direct current output, the 7th resistance (R
7) one end connection negative ripple DC output end, by the first resistance (R
1) and the 6th resistance (R
6) composition contact be sampling (2) output; Described the 7th resistance (R
7) can be fixed value resistance, can be also variable resistor; Described current limiting switch (4) is by the second field effect transistor (VT
2), the 9th NPN type triode (V
9) and the 8th resistance (R
8) composition; The second field effect transistor (VT
2) drain electrode connect the negative pole of filter capacitor, the second field effect transistor (VT
2) source electrode meet the 8th resistance (R
8) and the 9th NPN type triode (V
9) base stage, the 9th NPN type triode (V
9) collector electrode meet the second field effect transistor (VT
2) grid, the 9th NPN type triode (V
9) emitter and the 8th resistance (R
8) another termination negative ripple DC output end; Described filtering (5) is electrochemical capacitor (C), and the positive pole of electrochemical capacitor (C) is connected with positive pulsating direct current output, the negative pole of electrochemical capacitor (C) and the second field effect transistor (VT
2) drain electrode be connected with constant current (6); Described constant current (6) is by the second resistance (R
2), the 4th resistance (R
4), the 5th voltage stabilizing didoe (V
5), the 6th NPN type triode (V
6) and the first field effect transistor (VT
1) composition; The second resistance (R
2) one end be connected with positive pulsating direct current output, another termination the 5th voltage stabilizing didoe (V
5) positive pole, the 6th NPN type triode (V
6) collector electrode and the first field effect transistor (VT
1) grid, the first field effect transistor (VT
1) source electrode meet the 6th NPN type triode (V
6) base stage, the 4th resistance (R
4), the 4th resistance (R
4) the other end and the 5th voltage stabilizing didoe (V
5) negative pole, the 6th NPN type triode (V
6) negative pole of emitter, filter capacitor (C) is connected, the first field effect transistor (VT
1) drain electrode and positive pulsating direct current output form respectively negative pole and the positive pole of DC power supply.
2. low-power consumption according to claim 1, without isolated DC power supply, is characterized in that: described constant current (6) is substituted by following structure, and described constant current (6) is by resistance one (* R
1), resistance two (* R
2), a NPN type triode (V
11) and the 2nd NPN type triode (V
12) composition, resistance one (* R
1) and a NPN type triode (V
11) collector electrode be connected to the input of little electric current constant current, resistance one (* R
1) the other end and a NPN type triode (V
11) base stage, the 2nd NPN type triode (V
12) collector electrode be connected, a NPN type triode (V
11) emitter and the 2nd NPN type triode (V
12) base stage, resistance two (* R
2) be connected, the 2nd NPN type triode (V
12) emitter and resistance two (* R
2) the other end be connected to the output of little electric current constant current.
3. low-power consumption according to claim 1, without isolated DC power supply, is characterized in that: described constant current (6) is substituted by following structure, and constant current (6) is by resistance one (* R
1), resistance two (* R
2), the first positive-negative-positive triode (V
13) and the second positive-negative-positive triode (V
14) composition, resistance one (* R
1) and the first positive-negative-positive triode (V
13) collector electrode be connected to the output of little electric current constant current, resistance one (* R
1) the other end and the first positive-negative-positive triode (V
13) base stage, the second positive-negative-positive triode (V
14) collector electrode be connected, the first positive-negative-positive triode (V
13) emitter and the second positive-negative-positive triode (V
14) base stage, resistance two (* R
2) be connected, the second positive-negative-positive triode (V
14) emitter and resistance two (* R
2) the other end be connected to the input of little electric current constant current.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210056444.8A CN102611328B (en) | 2012-03-06 | 2012-03-06 | Low-power consumption isolation-free DC power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210056444.8A CN102611328B (en) | 2012-03-06 | 2012-03-06 | Low-power consumption isolation-free DC power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102611328A CN102611328A (en) | 2012-07-25 |
| CN102611328B true CN102611328B (en) | 2014-09-17 |
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| CN111338421B (en) * | 2019-12-09 | 2021-09-24 | 重庆西南集成电路设计有限责任公司 | Two-bus power supply linear voltage stabilizer capable of constant current-limiting switching and dual-mode voltage stabilizing circuit |
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| JP4156072B2 (en) * | 1998-04-23 | 2008-09-24 | アビックス株式会社 | LED collective lamp for AC power supply |
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| CN102611328A (en) | 2012-07-25 |
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