CN103618466A - Power circuit for supplying 5V voltage - Google Patents
Power circuit for supplying 5V voltage Download PDFInfo
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- CN103618466A CN103618466A CN201310667986.3A CN201310667986A CN103618466A CN 103618466 A CN103618466 A CN 103618466A CN 201310667986 A CN201310667986 A CN 201310667986A CN 103618466 A CN103618466 A CN 103618466A
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Abstract
The invention discloses a power circuit for supplying 5V voltage. The power circuit comprises a transformer T, a rectification filtering circuit, an RCD (residual current device) circuit, a feedback transmission circuit, a feedback receiving circuit, a first voltage output circuit, a second voltage output circuit and a third voltage output circuit, wherein the input end of the rectification filtering circuit is connected to a 220V alternating current power supply through a choking coil, and the output end of the rectification filtering circuit is connected with the input end of the RCD circuit; the feedback receiving circuit, the first voltage output circuit, the second voltage output circuit and the third voltage output circuit are respectively connected with the output end of the RCD circuit through the transformer; the input end of the feedback transmission circuit is connected with the first voltage output circuit, and the output end of the feedback transmission circuit is connected with the feedback receiving circuit; the feedback receiving circuit is connected with the output end of the rectification filtering circuit through a power controller. The power circuit has the advantages of small size, high efficiency, accurate voltage stabilization and low interference, and a plurality of paths of voltage can be simultaneously provided.
Description
Technical field
The present invention relates to a kind of power circuit, relate in particular to a kind of power circuit of the 5V of supply voltage.
Background technology
Along with the development of integrated circuit, various process chip application are more and more extensive, and the circuit of these chips and chip controls, often needs less direct voltage as operating voltage, and wherein, 5V direct voltage is exactly the conventional operating voltages such as CPU, telecommunication circuit.
Although there have been on the market at present some 220V alternating current can be converted to the galvanic module of 5V and equipment, but, current change-over circuit is all " one to one " mostly, that is to say, whole circuit only has a 220V alternating current input and a 5V DC output end, therefore, can only supply a kind of voltage, for some chips, although they are the operating voltages of 5V, operating current is different, so, just need a plurality of power supply circuits, can cause high, the bulky problem of cost.
Summary of the invention
For solving above-mentioned defect of the prior art, the invention provides a kind of power circuit of the 5V of supply voltage, not only volume is little for this circuit, efficiency is high, and the 5V direct voltage of the different rated current of multichannel can be provided.
For solving the problems of the technologies described above, the present invention program comprises: a kind of power circuit of supplying 5V voltage, it is characterized in that, comprise transformer T, current rectifying and wave filtering circuit, RCD circuit, feedback radiating circuit, feedback receiving circuit, the first voltage follower circuit, second voltage output circuit and tertiary voltage output circuit, the input of described current rectifying and wave filtering circuit is connected in 220V AC power by choking-winding, the output of current rectifying and wave filtering circuit is connected with the input of RCD circuit, feedback receiving circuit, the first voltage follower circuit, second voltage output circuit is connected with the output of RCD circuit by transformer respectively with tertiary voltage output circuit, the input of described feedback radiating circuit is connected with the first voltage follower circuit, the output of feedback radiating circuit is connected with feedback receiving circuit, feedback receiving circuit is connected with the output of current rectifying and wave filtering circuit by power-supply controller of electric.
Further, described transformer T comprises the first winding, the second winding, the tertiary winding, the 4th winding and the 5th winding, the first described winding is input and is provided with input port 1 and input port 2, the second described winding is output and is provided with output port 3 and output port 4, the described tertiary winding is output and is provided with output port 5 and output port 6, the 4th described winding is output and is provided with output port 7 and output port 8, and the 5th described winding is output and is provided with output port 9 and output port 10.
Further, described current rectifying and wave filtering circuit comprises rectifier bridge BD1, capacitor C 1 and resistance R 1, two inputs of BD1 are connected with two outputs of choking-winding L1X respectively, an input of L1X is connected with live wire by fuse FS1, and another input of L1X is connected with zero line by thermistor RTH, and described capacitor C 1 is connected with two outputs of rectifier bridge BD1 respectively, and the minus earth of capacitor C 1, resistance R 1 is in parallel with capacitor C 1.
Further, described RCD circuit comprises diode D1, diode D2, capacitor C 2, resistance R 2 and resistance R 3, the positive pole of D1 is connected with transformer T input port 1 with capacitor C 1 is anodal respectively, the negative pole of D1 is connected with one end of R3, the other end of R3 is connected with the negative pole of D2, the positive pole of D2 is connected with the input port 2 of transformer T, and capacitor C 2 and resistance R 2 are in parallel with D1 respectively.
Further, the first described voltage follower circuit comprises diode D3, resistance R 4, capacitor C 3, capacitor C 4, capacitor C 5, resistance R 5, inductance L 1, capacitor C 6 and capacitor C 7, the positive pole of D3 is connected with the output port 3 of transformer T, the negative pole of D3 is connected to one end of L1 by fuse FS2, the other end of L1 is connected to the first positive polarity delivery outlet, one end of R4 is connected with the positive pole of D3, the other end of R4 is connected with one end of C3, the other end of C3 is connected with the negative pole of D3, the positive pole of C4 is connected with the negative pole of D3, the negative pole of C4 is connected with the first voltage negative pole delivery outlet, one end of C5 is connected with the input port 1 of transformer T, the other end of C5 is connected with the negative pole of C4, R5 is in parallel with C4, the positive pole of C6 is connected with the first positive polarity delivery outlet, the negative pole of C6 is connected with the first voltage negative pole delivery outlet, C7 is in parallel with C6.
Further, described feedback radiating circuit comprises resistance R 6, resistance R 7, resistance R 8, resistance R 9, resistance R 10, capacitor C 8, controllable accurate source of stable pressure TL431, optical coupler U1, one end of R6 is connected with the positive pole of C4, the other end of R6 is connected with the first input end of U1, the two ends of R8 are connected with U1 the second input with U1 first input end respectively, one end of R7 is connected with the first positive polarity delivery outlet, the other end of R7 is connected with C8 one end with the B utmost point of TL431 respectively, the other end of C8 is connected with the second input of U1, the K utmost point of TL431 is connected with the second input of U1, the A utmost point of TL431 is connected with one end of R10, the other end of R10 is connected with one end of R9, the other end of R9 is connected with the B utmost point of TL431, the A utmost point of TL431 is also connected with the first voltage negative pole delivery outlet.
Further, described feedback receiving circuit comprises diode D4, capacitor C 9, capacitor C 10, capacitor C 11, resistance R 11, resistance R 12, the positive pole of D4 is connected with the output port 9 of transformer T, the negative pole of D4 is connected with the positive pole of C9, the minus earth of C9, one end of R11 is connected with the C port of power-supply controller of electric TOP244, the other end of R11 is connected with the positive pole of C10, the minus earth of C10, one end of C11 is connected with the C port of power-supply controller of electric TOP244, the other end ground connection of C11, one end of R12 is connected with the X port of power-supply controller of electric TOP244, the other end ground connection of R12, the output port 10 of transformer T, the F port of power-supply controller of electric TOP244, the S port of power-supply controller of electric TOP244 is ground connection respectively, the D port of power-supply controller of electric TOP244 is connected on the input port 2 of transformer T, the L port of power-supply controller of electric TOP244 is connected with the positive pole of capacitor C 1 by resistance R 13, two outputs of U1 are connected with the negative pole of D4 and the C port of power-supply controller of electric TOP244 respectively.
Further, described second voltage output circuit comprises diode D5, resistance R 14, capacitor C 12, capacitor C 13, capacitor C 14, circuit of three-terminal voltage-stabilizing integrated U2, the positive pole of D5 is connected with the output port 5 of transformer T, the negative pole of D5 is connected with the positive pole of C12, the negative pole of C12 is connected with the output port 6 of transformer T, R14 is in parallel with C12, the input pin of U2 is connected with the negative pole of D5, the output pin of U2 is connected with the anodal delivery outlet of second voltage by fuse FS3, the grounding pin of U2 is connected with second voltage negative pole delivery outlet, the positive pole of C13 is connected with the anodal delivery outlet of second voltage, the negative pole of C13 is connected with second voltage negative pole delivery outlet, C14 is in parallel with C13, the negative pole of C12 is also connected with the negative pole of C13.
Further, described tertiary voltage output circuit diode D6, resistance R 15, capacitor C 15, capacitor C 16, capacitor C 17, circuit of three-terminal voltage-stabilizing integrated U3, the positive pole of D6 is connected with the output port 7 of transformer T, the negative pole of D6 is connected with the positive pole of C15, the negative pole of C15 is connected with the output port 8 of transformer T, R15 is in parallel with C15, the input pin of U3 is connected with the negative pole of D6, the output pin of U3 is connected with the anodal delivery outlet of tertiary voltage by fuse FS4, the grounding pin of U3 is connected with tertiary voltage negative pole delivery outlet, the positive pole of C16 is connected with the anodal delivery outlet of tertiary voltage, the negative pole of C16 is connected with tertiary voltage negative pole delivery outlet, C17 is in parallel with C16, the negative pole of C15 is also connected with the negative pole of C17.
The invention has the beneficial effects as follows: delicate structure of the present invention, have advantages of that volume is little, efficiency is high, voltage stabilizing is accurate, it is little to disturb, meanwhile, by a circuit, a 220V alternating current of input is converted into 3 road 5V direct currents outputs, can be simultaneously provides power supply supply for various chips and circuit.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention;
Fig. 2 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specific embodiment of the invention is described, should be appreciated that exemplifying embodiment described herein, only for description and interpretation the present invention, is not intended to limit the present invention.
A kind of power circuit of supplying 5V voltage as shown in Figure 1, it comprises transformer T, current rectifying and wave filtering circuit, RCD circuit, feedback radiating circuit, feedback receiving circuit, the first voltage follower circuit, second voltage output circuit and tertiary voltage output circuit, the input of described current rectifying and wave filtering circuit is connected in 220V AC power by choking-winding, the output of current rectifying and wave filtering circuit is connected with the input of RCD circuit, feedback receiving circuit, the first voltage follower circuit, second voltage output circuit is connected with the output of RCD circuit by transformer respectively with tertiary voltage output circuit, the input of described feedback radiating circuit is connected with the first voltage follower circuit, the output of feedback radiating circuit is connected with feedback receiving circuit, feedback receiving circuit is connected with the output of current rectifying and wave filtering circuit by power-supply controller of electric.
As shown in Figure 2, described transformer T comprises the first winding, the second winding, the tertiary winding, the 4th winding and the 5th winding, the first described winding is input and is provided with input port 1 and input port 2, the second described winding is output and is provided with output port 3 and output port 4, the described tertiary winding is output and is provided with output port 5 and output port 6, the 4th described winding is output and is provided with output port 7 and output port 8, and the 5th described winding is output and is provided with output port 9 and output port 10.
Described current rectifying and wave filtering circuit comprises rectifier bridge BD1, capacitor C 1 and resistance R 1, mainly play the effect of rectification and filtering, two inputs of BD1 are connected with two outputs of choking-winding L1X respectively, an input of L1X is connected with live wire by fuse FS1, another input of L1X is connected with zero line by thermistor RTH, described capacitor C 1 is connected with two outputs of rectifier bridge BD1 respectively, and the minus earth of capacitor C 1, resistance R 1 is in parallel with capacitor C 1, wherein, choking-winding L1X can eliminate the common mode disturbances of feeder ear, fuse FS1 plays over-current and-load protective effect, thermistor RTH plays metering function.
Described RCD circuit comprises diode D1, diode D2, capacitor C 2, resistance R 2 and resistance R 3, is mainly used to absorb the moment peak voltage producing, thus protection transformer and control chip.The positive pole of D1 is connected with transformer T input port 1 with capacitor C 1 is anodal respectively, and the negative pole of D1 is connected with one end of R3, and the other end of R3 is connected with the negative pole of D2, and the positive pole of D2 is connected with the input port 2 of transformer T, and capacitor C 2 and resistance R 2 are in parallel with D1 respectively.
The first described voltage follower circuit comprises diode D3, resistance R 4, capacitor C 3, capacitor C 4, capacitor C 5, resistance R 5, inductance L 1, capacitor C 6 and capacitor C 7, and D3 is fast recovery rectifier diode, plays rectified action; C3 works to suppress concussion; protection rectifier diode, c4 is voltage stabilizing prime filter capacitor, absorbs voltage clutter; R5 is dummy load; power supply concussion while preventing rear class zero load, C7 is output filter capacitor, eliminates voltage ripple and clutter; L1 is outputting inductance, strobes.The positive pole of D3 is connected with the output port 3 of transformer T, the negative pole of D3 is connected to one end of L1 by fuse FS2, the other end of L1 is connected to the first positive polarity delivery outlet, one end of R4 is connected with the positive pole of D3, the other end of R4 is connected with one end of C3, the other end of C3 is connected with the negative pole of D3, the positive pole of C4 is connected with the negative pole of D3, the negative pole of C4 is connected with the first voltage negative pole delivery outlet, one end of C5 is connected with the input port 1 of transformer T, the other end of C5 is connected with the negative pole of C4, R5 is in parallel with C4, the positive pole of C6 is connected with the first positive polarity delivery outlet, the negative pole of C6 is connected with the first voltage negative pole delivery outlet, C7 is in parallel with C6.
Described feedback radiating circuit comprises resistance R 6, resistance R 7, resistance R 8, resistance R 9, resistance R 10, capacitor C 8, controllable accurate source of stable pressure TL431, optical coupler U1; be used for guaranteeing guaranteeing output voltage when load variations; wherein TL431 is a reference source; R7, R9, R10 form collection regulating networks; R6 is current-limiting resistance; R8 is protective resistance; the input of protection optocoupler U1; the isolation of late-class circuit and the transmission of feedback signal before optocoupler U1 guarantees; C8 is the filter capacitor of feedback circuit, prevents from disturbing.One end of R6 is connected with the positive pole of C4, the other end of R6 is connected with the first input end of U1, the two ends of R8 are connected with U1 the second input with U1 first input end respectively, one end of R7 is connected with the first positive polarity delivery outlet, the other end of R7 is connected with C8 one end with the B utmost point of TL431 respectively, the other end of C8 is connected with the second input of U1, the K utmost point of TL431 is connected with the second input of U1, the A utmost point of TL431 is connected with one end of R10, the other end of R10 is connected with one end of R9, the other end of R9 is connected with the B utmost point of TL431, the A utmost point of TL431 is also connected with the first voltage negative pole delivery outlet.
Described feedback receiving circuit comprises diode D4, capacitor C 9, capacitor C 10, capacitor C 11, resistance R 11, resistance R 12, and D4 is fast recovery rectifier diode, C9, C10, C11 is filter circuit, R11 is current-limiting resistance, the charging current that suppresses capacitor C 10, the positive pole of D4 is connected with the output port 9 of transformer T, the negative pole of D4 is connected with the positive pole of C9, the minus earth of C9, one end of R11 is connected with the C port of power-supply controller of electric TOP244, the other end of R11 is connected with the positive pole of C10, the minus earth of C10, one end of C11 is connected with the C port of power-supply controller of electric TOP244, the other end ground connection of C11, one end of R12 is connected with the X port of power-supply controller of electric TOP244, the other end ground connection of R12, the output port 10 of transformer T, the F port of power-supply controller of electric TOP244, the S port of power-supply controller of electric TOP244 is ground connection respectively, the D port of power-supply controller of electric TOP244 is connected on the input port 2 of transformer T, the L port of power-supply controller of electric TOP244 is connected with the positive pole of capacitor C 1 by resistance R 13, two outputs of U1 are connected with the negative pole of D4 and the C port of power-supply controller of electric TOP244 respectively, wherein, TOP244 produces pwm signal, R13 is existing voltage acquisition current-limiting resistance.
Described second voltage output circuit comprises diode D5, resistance R 14, capacitor C 12, capacitor C 13, capacitor C 14, circuit of three-terminal voltage-stabilizing integrated U2, U2 guarantees output voltage stabilization, D5 is fast recovery rectifier diode, play rectified action, C13, C14 are output filter capacitor, eliminate voltage ripple and clutter, C12 is voltage stabilizing prime filter capacitor, absorb voltage clutter, R14 is dummy load, prevents the effect of power supply concussion when rear class is unloaded.The positive pole of D5 is connected with the output port 5 of transformer T, the negative pole of D5 is connected with the positive pole of C12, the negative pole of C12 is connected with the output port 6 of transformer T, R14 is in parallel with C12, the input pin of U2 is connected with the negative pole of D5, the output pin of U2 is connected with the anodal delivery outlet of second voltage by fuse FS3, the grounding pin of U2 is connected with second voltage negative pole delivery outlet, the positive pole of C13 is connected with the anodal delivery outlet of second voltage, the negative pole of C13 is connected with second voltage negative pole delivery outlet, C14 is in parallel with C13, and the negative pole of C12 is also connected with the negative pole of C13.
Described tertiary voltage output circuit diode D6, resistance R 15, capacitor C 15, capacitor C 16, capacitor C 17, circuit of three-terminal voltage-stabilizing integrated U3, U3 guarantees output voltage stabilization, D6 is fast recovery rectifier diode, play rectified action, C16, C17 are output filter capacitor, eliminate voltage ripple and clutter, C15 is voltage stabilizing prime filter capacitor, absorb voltage clutter, R15 is dummy load, prevents the effect of power supply concussion when rear class is unloaded.The positive pole of D6 is connected with the output port 7 of transformer T, the negative pole of D6 is connected with the positive pole of C15, the negative pole of C15 is connected with the output port 8 of transformer T, R15 is in parallel with C15, the input pin of U3 is connected with the negative pole of D6, the output pin of U3 is connected with the anodal delivery outlet of tertiary voltage by fuse FS4, the grounding pin of U3 is connected with tertiary voltage negative pole delivery outlet, the positive pole of C16 is connected with the anodal delivery outlet of tertiary voltage, the negative pole of C16 is connected with tertiary voltage negative pole delivery outlet, C17 is in parallel with C16, and the negative pole of C15 is also connected with the negative pole of C17.
Preferably, FS2, FS3, FS4 are resettable fuse, prevent output overloading or short circuit, it is 7805 circuit of three-terminal voltage-stabilizing integrated that described circuit of three-terminal voltage-stabilizing integrated U2 and circuit of three-terminal voltage-stabilizing integrated U3 all adopt model, described capacitor C 1, capacitor C 4, capacitor C 6, capacitor C 9, capacitor C 10, capacitor C 12, capacitor C 13, capacitor C 15, capacitor C 16 are polar capacitor, and described resistance R 10 is variable resistance.
After the access of 220V alternating current, after a series of processing such as over commutation, filtering, step-down, voltage stabilizing, power supply control, direct voltage from first voltage output end output 5V, 2A, from the direct voltage of second voltage output output 5V, 0.2A, from the direct voltage of tertiary voltage output output 5V, 0.2A.
Should be understood that; the above-mentioned description for preferred embodiment is comparatively detailed; can not therefore think the restriction to scope of patent protection of the present invention; those of ordinary skill in the art is under enlightenment of the present invention; do not departing from the scope situation that the claims in the present invention protect; can also make the various deformation such as replacement, simple combination, within these all fall into protection scope of the present invention, the scope of asking for protection of the present invention should be as the criterion with claims.
Claims (9)
1. a power circuit of supplying 5V voltage, it is characterized in that, comprise transformer T, current rectifying and wave filtering circuit, RCD circuit, feedback radiating circuit, feedback receiving circuit, the first voltage follower circuit, second voltage output circuit and tertiary voltage output circuit, the input of described current rectifying and wave filtering circuit is connected in 220V AC power by choking-winding, the output of current rectifying and wave filtering circuit is connected with the input of RCD circuit, feedback receiving circuit, the first voltage follower circuit, second voltage output circuit is connected with the output of RCD circuit by transformer respectively with tertiary voltage output circuit, the input of described feedback radiating circuit is connected with the first voltage follower circuit, the output of feedback radiating circuit is connected with feedback receiving circuit, feedback receiving circuit is connected with the output of current rectifying and wave filtering circuit by power-supply controller of electric.
2. a kind of power circuit of supplying 5V voltage according to claim 1, it is characterized in that, described transformer T comprises the first winding, the second winding, the tertiary winding, the 4th winding and the 5th winding, the first described winding is input and is provided with input port 1 and input port 2, the second described winding is output and is provided with output port 3 and output port 4, the described tertiary winding is output and is provided with output port 5 and output port 6, the 4th described winding is output and is provided with output port 7 and output port 8, the 5th described winding is output and is provided with output port 9 and output port 10.
3. a kind of power circuit of supplying 5V voltage according to claim 2, it is characterized in that, described current rectifying and wave filtering circuit comprises rectifier bridge BD1, capacitor C 1 and resistance R 1, two inputs of BD1 are connected with two outputs of choking-winding L1X respectively, an input of L1X is connected with live wire by fuse FS1, another input of L1X is connected with zero line by thermistor RTH, described capacitor C 1 is connected with two outputs of rectifier bridge BD1 respectively, and the minus earth of capacitor C 1, resistance R 1 is in parallel with capacitor C 1.
4. a kind of power circuit of supplying 5V voltage according to claim 3, it is characterized in that, described RCD circuit comprises diode D1, diode D2, capacitor C 2, resistance R 2 and resistance R 3, the positive pole of D1 is connected with transformer T input port 1 with capacitor C 1 is anodal respectively, the negative pole of D1 is connected with one end of R3, the other end of R3 is connected with the negative pole of D2, and the positive pole of D2 is connected with the input port 2 of transformer T, and capacitor C 2 and resistance R 2 are in parallel with D1 respectively.
5. a kind of power circuit of supplying 5V voltage according to claim 4, it is characterized in that, the first described voltage follower circuit comprises diode D3, resistance R 4, capacitor C 3, capacitor C 4, capacitor C 5, resistance R 5, inductance L 1, capacitor C 6 and capacitor C 7, the positive pole of D3 is connected with the output port 3 of transformer T, the negative pole of D3 is connected to one end of L1 by fuse FS2, the other end of L1 is connected to the first positive polarity delivery outlet, one end of R4 is connected with the positive pole of D3, the other end of R4 is connected with one end of C3, the other end of C3 is connected with the negative pole of D3, the positive pole of C4 is connected with the negative pole of D3, the negative pole of C4 is connected with the first voltage negative pole delivery outlet, one end of C5 is connected with the input port 1 of transformer T, the other end of C5 is connected with the negative pole of C4, R5 is in parallel with C4, the positive pole of C6 is connected with the first positive polarity delivery outlet, the negative pole of C6 is connected with the first voltage negative pole delivery outlet, C7 is in parallel with C6.
6. a kind of power circuit of supplying 5V voltage according to claim 5, it is characterized in that, described feedback radiating circuit comprises resistance R 6, resistance R 7, resistance R 8, resistance R 9, resistance R 10, capacitor C 8, controllable accurate source of stable pressure TL431, optical coupler U1, one end of R6 is connected with the positive pole of C4, the other end of R6 is connected with the first input end of U1, the two ends of R8 are connected with U1 the second input with U1 first input end respectively, one end of R7 is connected with the first positive polarity delivery outlet, the other end of R7 is connected with C8 one end with the B utmost point of TL431 respectively, the other end of C8 is connected with the second input of U1, the K utmost point of TL431 is connected with the second input of U1, the A utmost point of TL431 is connected with one end of R10, the other end of R10 is connected with one end of R9, the other end of R9 is connected with the B utmost point of TL431, the A utmost point of TL431 is also connected with the first voltage negative pole delivery outlet.
7. a kind of power circuit of supplying 5V voltage according to claim 6, it is characterized in that, described feedback receiving circuit comprises diode D4, capacitor C 9, capacitor C 10, capacitor C 11, resistance R 11, resistance R 12, the positive pole of D4 is connected with the output port 9 of transformer T, the negative pole of D4 is connected with the positive pole of C9, the minus earth of C9, one end of R11 is connected with the C port of power-supply controller of electric TOP244, the other end of R11 is connected with the positive pole of C10, the minus earth of C10, one end of C11 is connected with the C port of power-supply controller of electric TOP244, the other end ground connection of C11, one end of R12 is connected with the X port of power-supply controller of electric TOP244, the other end ground connection of R12, the output port 10 of transformer T, the F port of power-supply controller of electric TOP244, the S port of power-supply controller of electric TOP244 is ground connection respectively, the D port of power-supply controller of electric TOP244 is connected on the input port 2 of transformer T, the L port of power-supply controller of electric TOP244 is connected with the positive pole of capacitor C 1 by resistance R 13, two outputs of U1 are connected with the negative pole of D4 and the C port of power-supply controller of electric TOP244 respectively.
8. a kind of power circuit of supplying 5V voltage according to claim 7, it is characterized in that, described second voltage output circuit comprises diode D5, resistance R 14, capacitor C 12, capacitor C 13, capacitor C 14, circuit of three-terminal voltage-stabilizing integrated U2, the positive pole of D5 is connected with the output port 5 of transformer T, the negative pole of D5 is connected with the positive pole of C12, the negative pole of C12 is connected with the output port 6 of transformer T, R14 is in parallel with C12, the input pin of U2 is connected with the negative pole of D5, the output pin of U2 is connected with the anodal delivery outlet of second voltage by fuse FS3, the grounding pin of U2 is connected with second voltage negative pole delivery outlet, the positive pole of C13 is connected with the anodal delivery outlet of second voltage, the negative pole of C13 is connected with second voltage negative pole delivery outlet, C14 is in parallel with C13, the negative pole of C12 is also connected with the negative pole of C13.
9. a kind of power circuit of supplying 5V voltage according to claim 8, it is characterized in that, described tertiary voltage output circuit diode D6, resistance R 15, capacitor C 15, capacitor C 16, capacitor C 17, circuit of three-terminal voltage-stabilizing integrated U3, the positive pole of D6 is connected with the output port 7 of transformer T, the negative pole of D6 is connected with the positive pole of C15, the negative pole of C15 is connected with the output port 8 of transformer T, R15 is in parallel with C15, the input pin of U3 is connected with the negative pole of D6, the output pin of U3 is connected with the anodal delivery outlet of tertiary voltage by fuse FS4, the grounding pin of U3 is connected with tertiary voltage negative pole delivery outlet, the positive pole of C16 is connected with the anodal delivery outlet of tertiary voltage, the negative pole of C16 is connected with tertiary voltage negative pole delivery outlet, C17 is in parallel with C16, the negative pole of C15 is also connected with the negative pole of C17.
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Application publication date: 20140305 |