CN104682707A - Switching power supply for selectable output of voltage - Google Patents
Switching power supply for selectable output of voltage Download PDFInfo
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- CN104682707A CN104682707A CN201310627701.3A CN201310627701A CN104682707A CN 104682707 A CN104682707 A CN 104682707A CN 201310627701 A CN201310627701 A CN 201310627701A CN 104682707 A CN104682707 A CN 104682707A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/2176—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a switching power supply for selectable output of voltage. The switching power supply comprises a voltage transformation unit, a transformer, a switch unit, a feedback unit and an adjusting unit, wherein the switch unit is controlled by the control unit and is connected with the transformer and the control unit; the feedback unit is used for outputting a feedback signal; the adjusting unit is used for receiving a selection signal and is connected with the feedback unit; the third input end of the adjusting unit receives the selection signal; the first output end and the second output end of the adjusting unit are connected with a subordinate circuit; the third output end of the adjusting unit is connected with the third input end of the feedback unit; the adjusting unit receives the selection signal; the control unit controls the conducting or closing of the switch unit according to the selection signal so as to adjust the output voltage; the feedback unit outputs the feedback signal according to the output voltage; the control unit further adjusts the output voltage according to the feedback signal. According to the switching power supply disclosed by the invention, selectable output of the voltage can be realized; in addition, the circuit structure of the switching power supply is simple, so the weight of the circuit is reduced, and the EMC (Electro Magnetic Compatibility) overproof condition caused by a Y capacitor is avoided.
Description
Technical field
The present invention relates to Switching Power Supply, particularly relate to the Switching Power Supply of alternative output voltages.
Background technology
At a lot of audio frequency apparatus, in communication equipment, require the leakage current that power supply is very low.For avoiding power supply on the impact of equipment, a lot of equipment requirement has the optional function of dual output.But, equipment may have several functional module, and the operating voltage of each functional module is different, and does not work simultaneously, such as some audio frequency apparatus operating voltage is 5V, but the voltage that small machine in equipment or electromagnetism iron rule may need 12V even higher could normal work.So just need 5V, 12V dual power supply.And prior art uses the direct step-down of transformer in these applications, two groups of voltages are exported by 2 windings of secondary, through over commutation, filtering, voltage stabilizing obtains two kinds of voltages, such dual output power supply, need the switch arranging switch control rule or procedure auto-control second road power supply on device panel, Power Management Design is more complicated, again because transformer has two auxiliary winding, increase power supply weight, cost is higher.In addition, the interference of no Y capacitance designing power supply is comparatively serious, and EMC test exceeds standard.Some switching power source chip also can realize two-way voltage and export, but circuit is by the restriction of concrete Chip scale, and scheme is fixed, and cost is higher, is unfavorable for extensive use.
Summary of the invention
The technical problem to be solved in the present invention is the deficiency overcoming the existence of above-mentioned prior art, and a kind of Switching Power Supply of alternative output voltages is proposed, it can solve in prior art the complex structure adopting dual output electricity power supply, the problem that circuit weight is excessive, serious interference, cost are higher.
For solving the problems of the technologies described above, the present invention proposes a kind of Switching Power Supply of alternative output voltages, and it comprises: voltage transformation module, and it is for being converted to DC power supply AC power, and its input connects AC power; Control unit, it comprises supply module, first input end, the second input, the 3rd input, four-input terminal and output, and the first input end of control unit connects supply module, the second input end grounding of control unit; Transformer, it comprises a primary coil and one first secondary coil, and one end of the primary coil of transformer connects the output of voltage transformation module; Switch element, it is controlled by control unit, it comprises control end, input and output, the output of the control end connection control unit of switch element, the other end of the primary coil of the input connection transformer of switch element, the four-input terminal of the output connection control unit of switch element; Feedback unit, it is for output feedback signal, comprise first input end, the second input, the 3rd input, the first output, the second output, the 3rd output and the 4th output, the first input end of feedback unit and the first secondary coil of the equal connection transformer of the second input, 3rd output output feedback signal of feedback unit the 3rd input of connection control unit, the 4th output head grounding of feedback unit; Regulon, it is for receiving selection signal, it comprises first input end, the second input, the 3rd input, the first output, the second output and the 3rd output, the first input end of regulon and the second input connect the first output and second output of feedback unit, 3rd input of regulon receives selects signal, first output, second output of regulon connect subordinate's circuit, and the 3rd output of regulon connects the 3rd input of feedback unit; Wherein, regulon receives selects signal, control unit is according to selection Signal-controlled switch cell conduction or close to adjust output voltage, and feedback unit is according to output voltage output feedback signal, and control unit adjusts output voltage further according to feedback signal again.
Preferably, control unit also comprises switch control chip (IC1), electric capacity (C6), resistance (R3), resistance (R5) and resistance (R6), and switch control chip (IC1) comprises first end, the second end, the 3rd end, the 4th end and five terminal; The first input end of the first end connection control unit of switch control chip (IC1), the first end of switch control chip (IC1) connects electric capacity (C6) ground connection afterwards, second input of the second end contact resistance (R3) of switch control chip (IC1) connection control unit afterwards, 3rd input of the three-terminal link control unit of switch control chip (IC1), 4th end of switch control chip (IC1) connects resistance (R5) in parallel and resistance (R6) ground connection afterwards, the output of the five terminal connection control unit of switch control chip (IC1).
Preferably, supply module is linear voltage regulator.
Preferably, supply module comprises diode (D1), diode (D3), resistance (R7), resistance (R8), resistance (R9), resistance (R10), triode (Q2), triode (Q3), voltage-stabiliser tube (D5) and electric capacity (Y1), transformer also comprises second subprime coil, and second subprime coil comprises first end, the second end and the 3rd end, the anode of diode (D1) connects the first end of second subprime coil, the negative electrode of diode connects the negative electrode of voltage-stabiliser tube (D5), anode contact resistance (R9) ground connection afterwards of voltage-stabiliser tube (D5), the collector electrode of triode (Q2) connects the negative electrode of diode (D1), the emitter contact resistance (R10) of triode (Q2) is to the first end of switch control chip (IC1), the anode of diode (D3) connects the second end of second subprime coil, the emitter of the negative electrode connecting triode (Q2) of diode (D3), the collector electrode of triode (Q2) successively contact resistance (R7) and resistance (R8) afterwards to ground, the base stage of the collector electrode connecting triode (Q2) of triode (Q3), the base stage contact resistance (R7) of triode (Q3) and the junction of resistance (R8), the emitter of triode (Q3) connects the anode of voltage-stabiliser tube (D5), one end ground connection of electric capacity (Y1), the other end connects the second input of feedback unit, 3rd end ground connection of second subprime coil.
Preferably, switch element is triode (Q1), and the base stage of triode (Q1) is the control end of switch element, the input of the current collection of triode (Q1) very switch element, the output of the transmitting of triode (Q1) very switch element.
Preferably, switch element is metal-oxide-semiconductor, and the grid of metal-oxide-semiconductor is the control end of switch element, and the source electrode of metal-oxide-semiconductor is the input of switch element, and the drain electrode of metal-oxide-semiconductor is the output of switch element.
Preferably, feedback unit comprises diode (D2), electric capacity (C4), electric capacity (C5), electric capacity (C7), resistance (R11), resistance (R12), resistance (R13), optical coupler (P1), voltage-stabiliser tube (U1) and transformer (T2), the anode of diode (D2) connects the first input end of feedback unit, negative electrode connection electric capacity (C7) of diode (D2) connects the second input of feedback unit afterwards, the negative electrode of diode (D2) connects the first output of feedback unit, one end of resistance (R13) connects the negative electrode of diode (D2), the other end of resistance (R13) connects the anode of optical coupler (P1), the collector electrode of optical coupler (P1) successively contact resistance (R11) and electric capacity (C4) to the 4th output of feedback unit, the junction of resistance (R11) and electric capacity (C4) connects the 3rd output of feedback unit, the emitter of optical coupler (P1) connects the 4th output of feedback unit, the negative electrode of voltage-stabiliser tube (U1) connects the negative electrode of optical coupler (P1), the anode of voltage-stabiliser tube (U1) connects the second output of feedback unit, electric capacity (C5) and resistance (R12) is in series with successively between the negative electrode of voltage-stabiliser tube (U1) and reference pole, the reference pole of voltage-stabiliser tube (U1) connects the 3rd input of feedback unit.
Preferably, regulon comprises resistance (R14), resistance (R15), resistance (R16), electric capacity (C8), resistance (R17) and triode (Q4), between the first input end that resistance (R14) and resistance (R15) are connected on regulon successively and the second input, resistance (R14) is connected the 3rd output of regulon with the junction of resistance (R15), one end of resistance (R16) connects the 3rd output of regulon, the collector electrode of the other end connecting triode (Q4) of resistance (R16), the grounded emitter of triode (Q4), the base stage contact resistance (R17) of triode (Q4) is to the 3rd input of regulon, between the first input end that electric capacity (C8) is connected to regulon and the second input, the input of transformer (T2) is connected to the first input end of regulon, second input, the output of transformer (T2) is connected to the first output of regulon, second output.
Preferably, voltage transformation module comprises fuse (F1), regulating resistance (VR1), rectifier bridge (BG1) and LC filtration module, between the input that fuse (F1), regulating resistance (VR1), rectifier bridge (BG1) and LC filtration module are connected on voltage transformation module successively and output.
Preferably, change in voltage unit also comprises the peak absorbing module between the output being connected to LC filtration module and voltage transformation module, peak absorbing module comprises: resistance (R1), resistance (R2), resistance (R4), electric capacity (C3) and diode (D4), one end of resistance (R1) connects LC filtration module, the first input end of the other end connection control unit of resistance (R1), electric capacity (C3), between the first end that resistance (R4) and diode (D4) are connected on the first secondary coil of transformer successively and the second end, resistance (R2) is in parallel with electric capacity (C3).
Compared with prior art, the present invention has following beneficial effect: the Switching Power Supply of alternative output voltages of the present invention, feedback unit is adopted to select output end voltage, control unit adjustment output voltage, while making the output voltage of power supply have two kinds of selections, circuit structure is simple, alleviate the weight of circuit, and solve and exceed standard because remove the EMC that Y capacitance brings, add the signal degree of purity of power output end, also achieve the completely isolated of input and output, be applicable to the occasion higher to noise requirements.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the Switching Power Supply of alternative output voltages of the present invention.
Wherein, description of reference numerals is as follows: voltage transformation module 1 peak absorbing module 11 LC filtration module 12 control unit 2 supply module 21 transformer T1 switch element 3 feedback unit 4 regulon 5.
Embodiment
In order to further illustrate principle of the present invention and structure, existing by reference to the accompanying drawings to a preferred embodiment of the present invention will be described in detail.
the Switching Power Supply embodiment of alternative output voltages
A Switching Power Supply for alternative output voltages, it comprises: voltage transformation module 1, control unit 2, transformer T1, switch element 3, feedback unit 4 and regulon 5.
Voltage transformation module 1, it is for being converted to DC power supply AC power, and its input connects AC power.Control unit 2 comprises supply module 21, first input end, the second input, the 3rd input, four-input terminal and output.Transformer T1 comprises a primary coil and one first secondary coil.Switch element 3 is controlled by control unit 2, and it comprises control end, input and output.Feedback unit 4, it is for output feedback signal, comprises first input end, the second input, the 3rd input, the first output, the second output, the 3rd output and the 4th output.Regulon 5, it is for receiving selection signal, and it comprises first input end, the second input, the 3rd input, the first output, the second output and the 3rd output.
The first input end of control unit 2 connects supply module 21, the second input end grounding of control unit 2.One end of the primary coil of transformer T1 connects the output of voltage transformation module 1.The output of the control end connection control unit 2 of switch element 3, the other end of the primary coil of the input connection transformer T1 of switch element 3, the four-input terminal of the output connection control unit 2 of switch element 3.First secondary coil of the first input end of feedback unit 4 and the equal connection transformer T1 of the second input, 3rd input of feedback unit 4 receives selects signal, first output of feedback unit 4 and the second output connect subordinate's circuit and output voltage, 3rd output output feedback signal of feedback unit 4 the 3rd input of connection control unit 2, the 4th output head grounding of feedback unit 4.Wherein, feedback unit 4 receives selects output feedback signal after signal, and control unit 2 is according to unit 3 conducting of feedback signal control switch or close to adjust output voltage.The first input end of regulon 5 and the second input connect the first output and second output of feedback unit 4,3rd input of regulon 5 receives described selection signal, first output, second output of regulon 5 connect subordinate's circuit, and the 3rd output of regulon 5 connects the 3rd input of feedback unit 4.
Wherein, regulon 5 receives selects signal, control unit 2 is according to selection Signal-controlled switch unit 3 conducting or close to adjust output voltage, and feedback unit 4 is according to output voltage output feedback signal, and control unit 2 adjusts output voltage further according to feedback signal again.
Voltage transformation module 1 comprises fuse (F1), regulating resistance (VR1), rectifier bridge (BG1), LC filtration module 12 and peak absorbing module 11.Between the input that fuse (F1), regulating resistance (VR1), rectifier bridge (BG1), LC filtration module 12 and peak absorbing module 11 are connected on voltage transformation module 1 successively and output.Peak absorbing module 11 comprises: resistance (R1), resistance (R2), resistance (R4), electric capacity (C3) and diode (D4).One end of resistance (R1) connects LC filtration module, the first input end of the other end connection control unit 2 of resistance (R1), between the first end that electric capacity (C3), resistance (R4) and diode (D4) are connected on first secondary coil of transformer T1 successively and the second end, resistance (R2) is in parallel with electric capacity (C3).The pulse spike voltage that this peak absorbing module 11 produces when can absorb switch element 3 switch.
Control unit 2 comprises switch control chip (IC1), electric capacity (C6), resistance (R3), resistance (R5) and resistance (R6).Switch control chip (IC1) comprises first end, the second end, the 3rd end, the 4th end and five terminal.
The first input end of the first end connection control unit 2 of switch control chip (IC1), the first end of switch control chip (IC1) connects electric capacity (C6) ground connection afterwards, second input of the second end contact resistance (R3) of switch control chip (IC1) connection control unit 2 afterwards, 3rd input of the three-terminal link control unit 2 of switch control chip (IC1), 4th end of switch control chip (IC1) connects resistance (R5) in parallel and resistance (R6) ground connection afterwards, the output of the five terminal connection control unit 2 of switch control chip (IC1).
In the present embodiment, pin Vic+, Fren, FB, IS, GD of the first end of switch control chip (IC1), the second end, the 3rd end, the 4th end and five terminal corresponding switch control chip (IC1) respectively.
In the present embodiment, supply module 21 comprises diode (D1), diode (D3), resistance (R7), resistance (R8), resistance (R9), resistance (R10), triode (Q2), triode (Q3), voltage-stabiliser tube (D5) and electric capacity (Y1).Transformer T1 also comprises second subprime coil, and second subprime coil comprises first end, the second end and the 3rd end.
The anode of diode (D1) connects the first end of second subprime coil, and the negative electrode of diode connects the negative electrode of voltage-stabiliser tube (D5), anode contact resistance (R9) ground connection afterwards of voltage-stabiliser tube (D5).The collector electrode of triode (Q2) connects the negative electrode of diode (D1), and the emitter contact resistance (R10) of triode (Q2) is to the first end of switch control chip (IC1).The anode of diode (D3) connects the second end of second subprime coil, the emitter of the negative electrode connecting triode (Q2) of diode (D3), the collector electrode of triode (Q2) successively contact resistance (R7) and resistance (R8) afterwards to ground.The base stage of the collector electrode connecting triode (Q2) of triode (Q3), the base stage contact resistance (R7) of triode (Q3) and the junction of resistance (R8), the emitter of triode (Q3) connects the anode of voltage-stabiliser tube (D5).One end ground connection of electric capacity (Y1), the other end connects the second input of feedback unit 4, the 3rd end ground connection of second subprime coil.In the present embodiment, supply module 21 can output to the voltage of switch control chip (IC1) according to the conversion adjustment of voltage.
Execute in example at other, supply module 21 is linear voltage regulator, for switch control chip (IC1) provides voltage.Two-pack winding transformer is powered to IC, realizes automatically switching, ensure the normal work of IC by functional circuit,
In the present embodiment, switch element 3 is triode (Q1), and the base stage of triode (Q1) is the control end of switch element 3, the input of the current collection of triode (Q1) very switch element 3, the output of the transmitting of triode (Q1) very switch element 3.
In other embodiments, switch element 3 is metal-oxide-semiconductor, and the grid of metal-oxide-semiconductor is the control end of switch element 3, and the source electrode of metal-oxide-semiconductor is the input of switch element 3, and the drain electrode of metal-oxide-semiconductor is the output of switch element 3.
Feedback unit 4 comprises diode (D2), electric capacity (C4), electric capacity (C5), electric capacity (C7), resistance (R11), resistance (R12), resistance (R13), optical coupler (P1), voltage-stabiliser tube (U1) and transformer (T2).
The anode of diode (D2) connects the first input end of feedback unit 4, and negative electrode connection electric capacity (C7) of diode (D2) connects the second input of feedback unit 4 afterwards, and the negative electrode of diode (D2) connects the first output of feedback unit 4.One end of resistance (R13) connects the negative electrode of diode (D2), and the other end of resistance (R13) connects the anode of optical coupler (P1).The collector electrode of optical coupler (P1) successively after contact resistance (R11) and electric capacity (C4) to the 4th output of feedback unit 4, the junction of resistance (R11) and electric capacity (C4) connects the 3rd output of feedback unit.The emitter of optical coupler (P1) connects the 4th output of feedback unit 4.The negative electrode of voltage-stabiliser tube (U1) connects the negative electrode of optical coupler (P1), the anode of voltage-stabiliser tube (U1) connects the second output of feedback unit 4, be in series with electric capacity (C5) and resistance (R12) successively between the negative electrode of voltage-stabiliser tube (U1) and reference pole, the reference pole of voltage-stabiliser tube (U1) connects the 3rd input of described feedback unit.
Regulon 5 comprises resistance (R14), resistance (R15), resistance (R16), electric capacity (C8), resistance (R17) and triode (Q4).Between the first input end that resistance (R14) and resistance (R15) are connected on regulon 5 successively and the second input, resistance (R14) is connected the 3rd output of regulon 5 with the junction of resistance (R15).One end of resistance (R16) connects the reference pole of voltage-stabiliser tube, the collector electrode of the other end connecting triode (Q4) of resistance (R16).The grounded emitter of triode (Q4), the base stage contact resistance (R17) of triode (Q4) is to the 3rd input of regulon 5.Between the first input end that electric capacity (C8) is connected to regulon 5 and the second input, the input of transformer (T2) is connected to first input end, second input of regulon 5, and the output of transformer (T2) is connected to the first output of regulon 5, the second output.
light fixture embodiment
The present invention also proposes a kind of light fixture, and it comprises the Switching Power Supply of alternative output voltages as above.
Operation principle of the present invention is described in detail below in conjunction with Fig. 1.
When the 3rd input Con of regulon 5 is unsettled, control unit 2 control switch unit 3 conducting or closedown are to adjust output voltage, output voltage is+5V, (5V is greater than when the 3rd input Con of regulon 5 connects high level, here optional 5V or 12V), control unit 2 control switch unit 3 conducting or closedown are to adjust output voltage, and output voltage is 12V.
Compared with prior art, the present invention has following beneficial effect: the Switching Power Supply of alternative output voltages of the present invention, feedback unit is adopted to select output end voltage, control unit adjustment output voltage, while making the output voltage of power supply have two kinds of selections, circuit structure is simple, alleviate the weight of circuit, and solve and exceed standard because remove the EMC that Y capacitance brings, add the signal degree of purity of power output end, also achieve the completely isolated of input and output, be applicable to the occasion higher to noise requirements.
These are only better possible embodiments of the present invention, not limit the scope of the invention, all utilizations specification of the present invention and the change of the equivalent structure done by accompanying drawing content, be all included in protection scope of the present invention.
Claims (10)
1. a Switching Power Supply for alternative output voltages, is characterized in that, it comprises:
Voltage transformation module, it is for being converted to DC power supply AC power, and its input connects described AC power;
Control unit, it comprises supply module, first input end, the second input, the 3rd input, four-input terminal and output, and the first input end of described control unit connects described supply module, the second input end grounding of described control unit;
Transformer, it comprises a primary coil and one first secondary coil, and one end of the primary coil of described transformer connects the output of described voltage transformation module;
Switch element, it is controlled by described control unit, it comprises control end, input and output, the control end of described switch element connects the output of described control unit, the input of described switch element connects the other end of the primary coil of described transformer, and the output of described switch element connects the four-input terminal of described control unit;
Feedback unit, it is for output feedback signal, comprise first input end, the second input, the 3rd input, the first output, the second output, the 3rd output and the 4th output, first input end and second input of described feedback unit are all connected the first secondary coil of described transformer, 3rd output of described feedback unit exports described feedback signal and connects the 3rd input of described control unit, the 4th output head grounding of described feedback unit;
Regulon, it is for receiving selection signal, it comprises first input end, the second input, the 3rd input, the first output, the second output and the 3rd output, the first input end of described regulon and the second input connect the first output and second output of described feedback unit, 3rd input of described regulon receives described selection signal, first output, second output of described regulon connect subordinate's circuit, and the 3rd output of described regulon connects the 3rd input of described feedback unit;
Wherein, described regulon receives described selection signal, described control unit according to described selection signal controlling switching means conductive or close to adjust described output voltage, described feedback unit is according to described output voltage output feedback signal, and described control unit adjusts described output voltage further according to described feedback signal again.
2. Switching Power Supply as claimed in claim 1, it is characterized in that, described control unit also comprises switch control chip (IC1), electric capacity (C6), resistance (R3), resistance (R5) and resistance (R6), and described switch control chip (IC1) comprises first end, the second end, the 3rd end, the 4th end and five terminal;
The first end of described switch control chip (IC1) connects the first input end of described control unit, the first end of described switch control chip (IC1) connects described electric capacity (C6) ground connection afterwards, second end of described switch control chip (IC1) connects the second input that described resistance (R3) connects described control unit afterwards, 3rd input of control unit described in the three-terminal link of described switch control chip (IC1), 4th end of described switch control chip (IC1) connects described resistance (R5) in parallel and resistance (R6) ground connection afterwards, the five terminal of described switch control chip (IC1) connects the output of described control unit.
3. Switching Power Supply as claimed in claim 2, it is characterized in that, described supply module is linear voltage regulator.
4. Switching Power Supply as claimed in claim 2, it is characterized in that, described supply module comprises diode (D1), diode (D3), resistance (R7), resistance (R8), resistance (R9), resistance (R10), triode (Q2), triode (Q3), voltage-stabiliser tube (D5) and electric capacity (Y1), described transformer also comprises second subprime coil, and described second subprime coil comprises first end, the second end and the 3rd end;
The anode of described diode (D1) connects the first end of described second subprime coil, the negative electrode of described diode connects the negative electrode of described voltage-stabiliser tube (D5), the anode of described voltage-stabiliser tube (D5) connects described resistance (R9) ground connection afterwards, the collector electrode of described triode (Q2) connects the negative electrode of described diode (D1), the emitter of described triode (Q2) connects the first end of described resistance (R10) to described switch control chip (IC1), the anode of described diode (D3) connects the second end of described second subprime coil, the negative electrode of described diode (D3) connects the emitter of described triode (Q2), the collector electrode of described triode (Q2) connects described resistance (R7) and resistance (R8) successively afterwards to ground, the collector electrode of described triode (Q3) connects the base stage of described triode (Q2), the base stage of described triode (Q3) connects the junction of described resistance (R7) and resistance (R8), the emitter of described triode (Q3) connects the anode of described voltage-stabiliser tube (D5), one end ground connection of described electric capacity (Y1), the other end connects the second input of described feedback unit, 3rd end ground connection of described second subprime coil.
5. Switching Power Supply as claimed in claim 1, it is characterized in that, described switch element is triode (Q1), the base stage of described triode (Q1) is the control end of described switch element, the input of the very described switch element of current collection of described triode (Q1), the output of the very described switch element of transmitting of described triode (Q1).
6. Switching Power Supply as claimed in claim 1, it is characterized in that, described switch element is metal-oxide-semiconductor, and the grid of described metal-oxide-semiconductor is the control end of described switch element, the source electrode of described metal-oxide-semiconductor is the input of described switch element, and the drain electrode of described metal-oxide-semiconductor is the output of described switch element.
7. Switching Power Supply as claimed in claim 1, it is characterized in that, described feedback unit comprises diode (D2), electric capacity (C4), electric capacity (C5), electric capacity (C7), resistance (R11), resistance (R12), resistance (R13), optical coupler (P1), voltage-stabiliser tube (U1) and transformer (T2);
The anode of described diode (D2) connects the first input end of described feedback unit, the negative electrode of described diode (D2) connects the second input that described electric capacity (C7) connects described feedback unit afterwards, the negative electrode of described diode (D2) connects the first output of described feedback unit, one end of described resistance (R13) connects the negative electrode of described diode (D2), the other end of described resistance (R13) connects the anode of described optical coupler (P1), the collector electrode of described optical coupler (P1) connects described resistance (R11) and electric capacity (C4) the 4th output to described feedback unit successively, the junction of described resistance (R11) and electric capacity (C4) connects the 3rd output of described feedback unit, the emitter of described optical coupler (P1) connects the 4th output of described feedback unit, the negative electrode of described voltage-stabiliser tube (U1) connects the negative electrode of described optical coupler (P1), the anode of described voltage-stabiliser tube (U1) connects the second output of described feedback unit, described electric capacity (C5) and resistance (R12) is in series with successively between the negative electrode of described voltage-stabiliser tube (U1) and reference pole, the reference pole of described voltage-stabiliser tube (U1) connects the 3rd input of described feedback unit.
8. Switching Power Supply as claimed in claim 1, it is characterized in that, described regulon comprises resistance (R14), resistance (R15), resistance (R16), electric capacity (C8), resistance (R17) and triode (Q4);
Between the first input end that described resistance (R14) and resistance (R15) are connected on described regulon successively and the second input, described resistance (R14) is connected the 3rd output of described regulon with the junction of resistance (R15), one end of described resistance (R16) connects the 3rd output of described regulon, the other end of described resistance (R16) connects the collector electrode of described triode (Q4), the grounded emitter of described triode (Q4), the base stage of described triode (Q4) connects three input of described resistance (R17) to described regulon, between the first input end that described electric capacity (C8) is connected to described regulon and the second input, the input of described transformer (T2) is connected to the first input end of described regulon, second input, the output of described transformer (T2) is connected to the first output of described regulon, second output.
9. Switching Power Supply as claimed in claim 1, it is characterized in that, described voltage transformation module comprises fuse (F1), regulating resistance (VR1), rectifier bridge (BG1) and LC filtration module, between the input that described fuse (F1), regulating resistance (VR1), rectifier bridge (BG1) and LC filtration module are connected on described voltage transformation module successively and output.
10. Switching Power Supply as claimed in claim 1, it is characterized in that, described change in voltage unit also comprises the peak absorbing module between the output being connected to described LC filtration module and voltage transformation module, described peak absorbing module comprises: resistance (R1), resistance (R2), resistance (R4), electric capacity (C3) and diode (D4), one end of described resistance (R1) connects described LC filtration module, the other end of described resistance (R1) connects the first input end of described control unit, described electric capacity (C3), between the first end that resistance (R4) and diode (D4) are connected on the first secondary coil of described transformer successively and the second end, described resistance (R2) is in parallel with described electric capacity (C3).
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| CN201310627701.3A CN104682707A (en) | 2013-11-28 | 2013-11-28 | Switching power supply for selectable output of voltage |
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| CN201310627701.3A CN104682707A (en) | 2013-11-28 | 2013-11-28 | Switching power supply for selectable output of voltage |
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| CN104682707A true CN104682707A (en) | 2015-06-03 |
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| CN201310627701.3A Pending CN104682707A (en) | 2013-11-28 | 2013-11-28 | Switching power supply for selectable output of voltage |
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Cited By (1)
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| CN113741606A (en) * | 2021-08-06 | 2021-12-03 | 深圳市立创普电源技术有限公司 | Power control circuit capable of self-adapting to input voltage |
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