CN202696996U - Efficient non-isolated switching power supply - Google Patents
Efficient non-isolated switching power supply Download PDFInfo
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- CN202696996U CN202696996U CN 201220391624 CN201220391624U CN202696996U CN 202696996 U CN202696996 U CN 202696996U CN 201220391624 CN201220391624 CN 201220391624 CN 201220391624 U CN201220391624 U CN 201220391624U CN 202696996 U CN202696996 U CN 202696996U
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Abstract
The utility model provides an efficient non-isolated switching power supply for users. The efficient non-isolated switching power supply comprises a rectifying filter circuit, a switching power circuit, a switching power control circuit, and an output constant current circuit. A power supply device rectifies and filters 220V electric supply to direct current through a bridge rectifier. The power supply device uses a field-effect tube circuit as the switching circuit and a reference power supply circuit as a control circuit of the switching circuit, and output constant current is supplied to various LED lamps. Efficiency of the power supply device reaches 98%, much higher than that of an existing switching power supply whose efficiency is 90%. The power supply device is advantaged by small size, little components used without cooling fins, and low cost. Output power of the power supply device can reach 100W, maximum output voltage can reach 300V, and minimum output voltage is tens of volts. The power supply device has a dimming function. The efficient non-isolated switching power supply solves technical problems of relatively large energy consumption and insufficient power-supply efficiency exist in driving powers of existing LED lamps, and solves a problem that cooling pins are needed in driving powers of the existing LED lamps, etc.
Description
Technical field
The utility model relates to a kind of efficient non-isolated switching power unit, and its efficient is high especially, and purpose is the driving power as the LED light fixture.
Background technology
At present, the driving power of various LED light fixtures also exists some problems to wait to solve, energy consumption such as general Switching Power Supply is also larger, general power-efficient is also not high enough, the highest also only has 90%, also have portion of energy to become heat exhaustion and fallen, but also need to distribute these heats with fin.
Summary of the invention
The described problem that exists in order to solve present LED light fixture driving power, the purpose of this utility model is: for the client provides a kind of efficient non-isolated Switching Power Supply, its circuit is simple, the use element is few, volume is very little, substantially few of energy loss does not need to use fin, and efficient can reach 98%.
The utility model provides the basic technical scheme of enforcement as follows:
A kind of efficient non-isolated Switching Power Supply is characterized in that: the control circuit and the output constant current circuit that include current rectifying and wave filtering circuit, switching power circuit, Switching Power Supply; Wherein:
In the rectification circuit that is formed by rectifier bridge stack, the input two ends of rectifier bridge stack (1) connect 220 volts of electric mains, one end ground connection is arranged at the two ends of its output and other end output voltage V+, this output voltage V+and ground wire between the tipping filter capacitor (2) is arranged, formed described current rectifying and wave filtering circuit;
Switching power circuit, by field effect transistor (8) and grid thereof, drain electrode and source circuit form, wherein grid circuit is the grid by field effect transistor (8), be connected in the rectification circuit on the output voltage wire V+ by resistance (3) series resistance (6), drain circuit is the drain electrode by field effect transistor (8), inductance (4) by parallel connection is connected on the output voltage wire V+ with diode (5), source circuit is the source electrode by field effect transistor (8), be connected on the low-pressure end of resistance (6) by voltage stabilizing didoe (7), and this source electrode is in addition by electric capacity (9) ground connection;
The control circuit of Switching Power Supply, by reference power supply and negative electrode thereof, form with reference to the utmost point and anode circuit, wherein:
The cathode circuit of reference power supply (10) connects respectively the grid of field effect transistor (8) and the low-pressure end of resistance (3) forms by its negative electrode;
It is with reference to polar circuit, it is the reference utmost point by reference power supply (10), be connected to by resistance (12) on the bus of negative pole of the low-pressure end of resistance (6) and voltage stabilizing didoe (7), this with reference to the utmost point in addition by resistance (11) be connected respectively to field effect transistor (8) source electrode, voltage stabilizing didoe (7) positive pole and pass through electric capacity (9) ground connection;
Its anode circuit, it is the anode of reference power supply (10), be connected respectively to by resistance (13) field effect transistor (8) source electrode, voltage stabilizing didoe (7) positive pole and by electric capacity (9) ground connection, and this anode is in addition by electric capacity (14), is connected respectively on the common connecting line of the reference utmost point of reference power supply (10) and resistance (11) and resistance (12);
The output constant current circuit is the common connecting line of the anode of reference power supply (10) and resistance (13) and with ground wire the circuit of LED light fixture (15) is housed indirectly.
LED light fixture (15) is by 15-1, the 15-2 of serial connection ... 15-n N light-emitting diode forms.Additional technical feature is:
1. the resistance (3) in field effect transistor (8) grid circuit is replaced to voltage stabilizing didoe (20), the resistance (6) that is connected with output voltage wire V+ in this grid circuit is replaced to by resistance (16), voltage stabilizing didoe (17), triode (18) and resistance (19) form the constant-current supply of grid circuit, wherein the collector electrode of triode (18) is connected respectively to the negative pole of voltage stabilizing didoe (20) and voltage stabilizing didoe (7), its emitter is connected on the output voltage wire V+ of rectification circuit by resistance (16), its base stage is by resistance (19) ground connection GND, and this base stage is connected on the output voltage wire V+ of rectification circuit by voltage stabilizing didoe (17) in addition.
2. not only the resistance (3) of field effect transistor (8) grid circuit is replaced to voltage stabilizing didoe (20), the resistance (6) that is connected with output voltage wire V+ in this grid circuit is replaced to by described resistance (16), voltage stabilizing didoe (17), the grid circuit constant-current supply that triode (18) and resistance (19) form, and between one of Qiao Dui (1) input arm and 220 volts of civil powers, be connected in series the electric capacity (21) that a reduction bridge is piled input voltage, make this electric power output voltage be easy to drop to very low, to satisfy the requirement of low voltage light fixture.
Operation principle of the present utility model is as follows:
220 volts of civil powers are transformed into VD V+ in current rectifying and wave filtering circuit, it generally is worth at 310 volts, input to the drain electrode of field effect transistor (8) through inductance (4), when the grid of field effect transistor (8) is high level more than 5 volts, field effect transistor (8) conducting, electric current flows to its source electrode from the drain electrode of field effect transistor (8) makes electric capacity (9) begin charging and voltage raises gradually, this voltage that raises gradually charges to electric capacity (14) by resistance (11) again and its voltage is raise gradually, the rising of this voltage is very responsive to the reference power supply (10) that is used as high-amplification-factor, make very soon the cathode voltage of reference power supply (10) drop to suddenly 3 volts of following low levels, make field effect transistor (8) cut-off, the electric charge that is stored on the electric capacity (9) flows out through resistance (13), offers LED light fixture (15) the required electric current that throws light on.Therefore, change the resistance of resistance (13), can change this electric power outputting current size; Equally, the resistance value ratio of change resistance (11) and resistance (12) also can change this electric power outputting current size.
Output voltage V+the voltage required with LED light fixture (15), the pressure reduction of these two voltages is born jointly by field effect transistor (8), inductance (4): when field effect transistor (8) conducting, this pressure reduction is born by inductance (4) basically; During being on the scene effect pipe (8) cut-off, this pressure reduction is born by field effect transistor (8) basically, and the reverse voltage of inductance (4) energy storage induction this moment is by diode (5) short circuit, energy storage in the inductance (4) becomes electric energy and is returned in the electric capacity (2), has greatly reduced energy loss.
The resistance (6) that field effect transistor (8) grid circuit Central Plains arranges, or replacing to the constant-current supply that is formed by described resistance (16), voltage stabilizing didoe (17), triode (18) and resistance (19), its effect all is to provide voltage stabilizing required electric current for voltage stabilizing didoe (7); Because the electric current that constant-current supply provides is very stable, so to the stable better effects if of voltage stabilizing didoe (7), when this electric power output voltage just alters a great deal, use constant-current supply to make the current stability of the utility model power supply output better.
The beneficial effects of the utility model are, this power-efficient has been brought up to the level of efficiency that surpasses present Switching Power Supply 90% far away, show that through experiment test this power-efficient has reached 98%, its caloric value reduces greatly, in the practical power device, do not needed fin, the supply unit volume that manufactures reduces greatly, required element seldom, cost has obviously reduced, but the power of output has reached 100 watts, and the direct voltage of output reaches as high as 300 volts, and minimum only have tens volts, also have dimming function, solved the existing practical problem of present LED light fixture driving power.
Description of drawings
Fig. 1 is the basic circuit principle assumption diagram of the efficient non-isolated Switching Power Supply of the utility model
Fig. 2 is the utility model circuit diagram that the field effect pipe has the constant-current source grid circuit on Fig. 1 basis
Fig. 3 is that rectifier bridge stack one input arm is provided with mark among the utility model circuit diagram figure of electric capacity on Fig. 2 basis: 1 is rectifier bridge stack, and 2 is electrolytic capacitor filter, and 3 is resistance, 4 is inductance, 5 is diode, and 6 is resistance, and 7 is voltage stabilizing didoe, 8 is field effect transistor, 9 is electric capacity, and 10 is reference power supply, and 11 is resistance, 12 is resistance, 13 is resistance, and 14 is electric capacity, and 15-1,15-2,15-n. are light-emitting diode, 16 is resistance, 17 is voltage stabilizing didoe, and 18 is triode, and 19 is resistance, 20 is voltage stabilizing didoe, and 21 for being arranged on the electric capacity on the bridge heap one input arm.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in detail.
Embodiment 1: a kind of new and effective non-isolated Switching Power Supply
As shown in Figure 1: the basic circuit of the efficient non-isolated Switching Power Supply of the utility model includes the control circuit of current rectifying and wave filtering circuit, switching power circuit, Switching Power Supply and exports constant current circuit; Wherein:
In the rectification circuit that is formed by rectifier bridge stack (1), the input two ends of rectifier bridge stack (1) connect 220 volts of electric mains, one end ground connection is arranged at the two ends of its output and other end output voltage V+, this output voltage V+and ground wire between the tipping filter capacitor (2) is arranged, formed described current rectifying and wave filtering circuit;
Switching power circuit, by field effect transistor (8) and grid thereof, drain electrode and source circuit form, wherein grid circuit is the grid by field effect transistor (8), be connected in the rectification circuit on the output voltage wire V+ by resistance (3) series resistance (6), drain circuit is the drain electrode by field effect transistor (8), inductance (4) by parallel connection is connected on the output voltage wire V+ with diode (5), source circuit is the source electrode by field effect transistor (8), be connected on the low-pressure end of resistance (6) by voltage stabilizing didoe (7), and this source electrode is in addition by electric capacity (9) ground connection;
The control circuit of Switching Power Supply, by reference power supply and negative electrode thereof, form with reference to the utmost point and anode circuit: wherein, the cathode circuit of reference power supply connects respectively the grid of field effect transistor (8) and the low-pressure end of resistance (3) forms by its negative electrode; It is with reference to polar circuit, it is the reference utmost point by reference power supply (10), be connected to by resistance (12) on the bus of the low-pressure end of resistance (6) and voltage stabilizing didoe (7) negative pole, this with reference to the utmost point in addition by resistance (11) be connected respectively to field effect transistor (8) source electrode, voltage stabilizing didoe (7) positive pole and pass through electric capacity (9) ground connection; Its anode circuit, be by resistance (13) be connected respectively to field effect transistor (8) source electrode, voltage stabilizing didoe (7) positive pole and by electric capacity (9) ground connection, and this anode is connected respectively to the reference utmost point of reference power supply (10) and the common connecting line of resistance (11) and resistance (12) by electric capacity (14) in addition;
The output constant current circuit, be the anode of reference power supply (10) and resistance (13) common connecting line and and ground wire between the circuit of tipping LED light fixture (15), this LED light fixture (15) can be comprised of N 15-1,15-2...15-n light-emitting diode of connecting.
Embodiment 2: field effect transistor has the new and effective non-isolated Switching Power Supply of constant-current source grid circuit
As shown in Figure 2: the basic circuit of the efficient non-isolated Switching Power Supply of the utility model includes the control circuit of current rectifying and wave filtering circuit, switching power circuit, Switching Power Supply and exports constant current circuit; Wherein:
In the rectification circuit that is formed by rectifier bridge stack (1), two inputs of rectifier bridge stack (1) connect 220 volts of electric mains, one end ground connection is arranged at the two ends of its output and other end output voltage V+, this output voltage V+and ground wire between the tipping filter capacitor (2) is arranged, formed described current rectifying and wave filtering circuit;
Switching power circuit is comprised of field effect transistor (8) and grid, drain electrode and source circuit; Wherein:
Grid circuit, by the collector electrode of voltage stabilizing didoe (20) connecting triode (18) and the negative pole of voltage stabilizing didoe (7) by the grid of field effect transistor (8), triode (18) emitter is connected on the output voltage wire V+ of rectification circuit by resistance (16), the base stage of triode (18) is by resistance (19) ground connection GND, this base stage is connected on the output voltage wire V+ of rectification circuit by voltage stabilizing didoe (17) in addition, like this voltage stabilizing didoe (20) and by triode (18), resistance (16), the constant-current supply that voltage stabilizing didoe (17) and resistance (19) form becomes the grid circuit of field effect transistor 8;
Drain circuit is the drain electrode by field effect transistor (8), and the inductance (4) by parallel connection is connected on the output voltage wire V+ with diode (5);
Source circuit is the source electrode by field effect transistor (8), be connected on the collector electrode of triode in the constant-current supply (18) by voltage stabilizing didoe (7), and this source electrode is in addition by electric capacity (9) ground connection;
The control circuit of Switching Power Supply, by reference power supply and negative electrode thereof, form with reference to the utmost point and anode circuit: wherein, the cathode circuit of reference power supply, the grid and the voltage stabilizing didoe (20) that are connected respectively field effect transistor (8) by its negative electrode form; It is with reference to polar circuit, it is the reference utmost point by reference power supply (10), be connected to by resistance (12) on the bus of the collector electrode of triode (18) and voltage stabilizing didoe (7) and the negative pole of (20), this with reference to the utmost point in addition by resistance (11) be connected respectively to field effect transistor (8) source electrode, voltage stabilizing didoe (7) positive pole and pass through electric capacity 9 ground connection; Its anode circuit, be to be connected respectively on the positive pole of source electrode, voltage stabilizing didoe (7) of field effect transistor (8) and by electric capacity 9 ground connection by resistance (13), and this anode is connected respectively to the reference utmost point of reference power supply (10) and the common connecting line of resistance (11) and resistance (12) by electric capacity (14) in addition;
The output constant current circuit, be the anode of reference power supply (10) and resistance 13 common connecting line and and ground wire between the circuit of tipping LED light fixture (15), this LED light fixture (15) can be comprised of N 15-1,15-2...15-n light-emitting diode of connecting.
Embodiment 3: rectifier bridge stack one input arm is provided with the efficient non-isolated Switching Power Supply of electric capacity
As shown in Figure 3: it is basic identical that present embodiment circuit and example are executed example 2, difference only is: this example is connected in series the electric capacity (21) that a reduction bridge is piled input voltage between input arm of the bridge of input circuit heap (1) and 220 volts of civil powers, remainder and embodiment 2 are identical.
Claims (3)
1. an efficient non-isolated Switching Power Supply is characterized in that: the control circuit and the output constant current circuit that include current rectifying and wave filtering circuit, switching power circuit, Switching Power Supply; Wherein:
In the rectification circuit that is formed by rectifier bridge stack (1), the input two ends of rectifier bridge stack (1) connect 220 volts of electric mains, one end ground connection is arranged at the two ends of its output and other end output voltage V+, this output voltage V+and ground wire between the tipping filter capacitor (2) is arranged, formed described current rectifying and wave filtering circuit;
Switching power circuit, by field effect transistor (8) and grid thereof, drain electrode and source circuit form, wherein grid circuit is the grid by field effect transistor (8), be connected in the rectification circuit on the output voltage wire V+ by resistance (3) series resistance (6), drain circuit is the drain electrode by field effect transistor (8), inductance (4) by parallel connection is connected on the output voltage wire V+ with diode (5), source circuit is the source electrode by field effect transistor (8), be connected on the low-pressure end of resistance (6) by voltage stabilizing didoe (7), and this source electrode is in addition by electric capacity (9) ground connection;
The control circuit of Switching Power Supply, be by TL431 reference power supply device hereinafter to be referred as reference power supply, and negative electrode, form with reference to the utmost point and anode circuit, wherein:
The cathode circuit of reference power supply connects respectively the grid of field effect transistor (8) and the low-pressure end of resistance (3) forms by its negative electrode;
It is with reference to polar circuit, it is the reference utmost point by reference power supply (10), be connected to by resistance (12) on the bus of the low-pressure end of resistance (6) and voltage stabilizing didoe (7) negative pole, this is connected respectively to the source electrode of field effect transistor (8), the positive pole of voltage stabilizing didoe (7) by resistance (11) in addition with reference to the utmost point, and by electric capacity (9) ground connection;
Its anode circuit, it is the anode of reference power supply (10), be connected respectively to the source electrode of field effect transistor (8), the positive pole of voltage stabilizing didoe (7) by resistance (13), and by electric capacity (9) ground connection, and this anode is in addition by electric capacity (14), is connected respectively on the common connecting line of the reference utmost point of reference power supply (10) and resistance (11) and resistance (12);
The output constant current circuit is the common connecting line of the anode of reference power supply (10) and resistance (13) and with ground wire the circuit of LED light fixture (15) is housed indirectly.
2. according to efficient non-isolated Switching Power Supply claimed in claim 1, it is characterized in that: the grid circuit of described field effect transistor (8), it is the grid by field effect transistor (8), by the collector electrode of voltage stabilizing didoe (20) connecting triode (18) and the negative pole of voltage stabilizing didoe (7), the emitter of triode (18) is connected on the output voltage wire V+ of rectification circuit by resistance (16), the base stage of triode (18) is by resistance (19) ground connection GND, this base stage is connected on the output voltage wire V+ of rectification circuit by voltage stabilizing didoe (17) in addition, like this voltage stabilizing didoe (20) and by triode (18), resistance (16), the constant-current supply that voltage stabilizing didoe (17) and resistance (19) form becomes the grid circuit of field effect transistor (8).
3. according to efficient non-isolated Switching Power Supply claimed in claim 2, it is characterized in that: described in the rectification circuit of input, between one of Qi Qiaodui (1) input arm and 220 volts of civil powers, be connected in series the electric capacity (21) that the reduction bridge is piled input voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220391624 CN202696996U (en) | 2012-08-09 | 2012-08-09 | Efficient non-isolated switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220391624 CN202696996U (en) | 2012-08-09 | 2012-08-09 | Efficient non-isolated switching power supply |
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| Publication Number | Publication Date |
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| CN202696996U true CN202696996U (en) | 2013-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220391624 Expired - Fee Related CN202696996U (en) | 2012-08-09 | 2012-08-09 | Efficient non-isolated switching power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104362873A (en) * | 2014-12-01 | 2015-02-18 | 张光阳 | Efficient non-isolated power source |
| CN110650572A (en) * | 2019-09-27 | 2020-01-03 | 浙江孚硕电通股份有限公司 | LED power supply |
-
2012
- 2012-08-09 CN CN 201220391624 patent/CN202696996U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104362873A (en) * | 2014-12-01 | 2015-02-18 | 张光阳 | Efficient non-isolated power source |
| CN110650572A (en) * | 2019-09-27 | 2020-01-03 | 浙江孚硕电通股份有限公司 | LED power supply |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20140809 |
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| EXPY | Termination of patent right or utility model |