CN204392101U - AC/DC circuit and switching power supply - Google Patents
AC/DC circuit and switching power supply Download PDFInfo
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- CN204392101U CN204392101U CN201520096513.7U CN201520096513U CN204392101U CN 204392101 U CN204392101 U CN 204392101U CN 201520096513 U CN201520096513 U CN 201520096513U CN 204392101 U CN204392101 U CN 204392101U
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Abstract
The utility model discloses a kind of AC/DC circuit, this AC/DC circuit comprises ac power input end, input rectifying filter circuit, input rectifying secondary filtering circuit, power conversion circuits, output rectifier and filter, output sampling feedback circuit, DC power output end and for providing the power supply circuits of operating voltage for power conversion circuits; The input of input rectifying filter circuit is connected with ac power input end, and the output of input rectifying filter circuit is connected with power conversion circuits through input rectifying secondary filtering circuit; The operating voltage input of power conversion circuits is connected with power supply circuits, and the output of power conversion circuits is connected with DC power output end through output rectifier and filter; The input exporting sampling feedback circuit is connected with DC power output end, and the output exporting sampling feedback circuit is connected with the FEEDBACK CONTROL input of power conversion circuits.The utility model has the advantage that conversion efficiency is high, low in energy consumption and cost is low.
Description
Technical field
The utility model relates to power technique fields, particularly a kind of AC/DC circuit and Switching Power Supply.
Background technology
At present, because Switching Power Supply has the incomparable advantage of other power supplys, switch power technology is made to obtain very fast development.But Switching Power Supply also has many places to be modified in volume, weight, operating efficiency, interference free performance, Electro Magnetic Compatibility, stand-by power consumption and safety in utilization etc.And appear in our daily life along with increasing electronic product; government organs all over the world and industry organization formulate corresponding energy consumption codes and standards all one after another, to help to control better the stand-by power consumption of product and conversion efficiency, cost-saving with protection of the environment with promote tiers in market.In prior art, all there is the defect that conversion efficiency is low, power consumption is high and cost is high in the AC/DC circuit in most Switching Power Supply.
Utility model content
Main purpose of the present utility model is to provide the AC/DC circuit that a kind of conversion efficiency is high, low in energy consumption and cost is low.
In order to achieve the above object, the utility model proposes a kind of AC/DC circuit, described AC/DC circuit comprises ac power input end, input rectifying filter circuit, input rectifying secondary filtering circuit, power conversion circuits, output rectifier and filter, output sampling feedback circuit, DC power output end and for providing the power supply circuits of operating voltage for described power conversion circuits; Wherein,
The input of described input rectifying filter circuit is connected with described ac power input end, and the output of described input rectifying filter circuit is connected with described power conversion circuits through described input rectifying secondary filtering circuit; The operating voltage input of described power conversion circuits is connected with described power supply circuits, and the output of described power conversion circuits is connected with described DC power output end through described output rectifier and filter; The input of described output sampling feedback circuit is connected with described DC power output end, and the described output of output sampling feedback circuit is connected with the FEEDBACK CONTROL input of described power conversion circuits.
Preferably, described input rectifying filter circuit comprises the first diode, the second diode, the 3rd diode, the 4th diode and the first electrochemical capacitor; Wherein,
The negative electrode of described first diode is connected with the anode of described second diode and the live wire of described ac power input end respectively, the anode of described first diode and the equal ground connection of anode of described 3rd diode; The negative electrode of described 3rd diode is connected with the described anode of the 4th diode and the zero line of described ac power input end respectively; The negative electrode of described 4th diode is connected with the negative electrode of described second diode; The negative electrode of described second diode is also connected with the positive pole of described first electrochemical capacitor; The minus earth of described first electrochemical capacitor.
Preferably, described input rectifying secondary filtering circuit comprises the first inductance, the second inductance and the second electrochemical capacitor; Wherein,
The first end of described first inductance is connected with the negative electrode of described second diode, and the second end of described first inductance is connected with the positive pole of described second electrochemical capacitor; The minus earth of described second electrochemical capacitor; The first end ground connection of described second inductance, the second end of described second inductance is connected with the negative pole of described second electrochemical capacitor.
Preferably, described power conversion circuits comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the first electric capacity, the second electric capacity, the 5th diode, the 6th diode, NMOS tube, PWM control integration chip and power delivery transformer; Wherein,
The first end of described first resistance is connected with the second end of described first inductance, and the second end of described first resistance is connected with the negative electrode of described 5th diode; The anode of described 5th diode is connected with the different name end of former limit winding of described power delivery transformer and the drain electrode of described NMOS tube respectively; The Same Name of Ends of the former limit winding of described power delivery transformer is connected with the first end of described first resistance; The Same Name of Ends of the first auxiliary winding of described power delivery transformer is connected with described output rectifier and filter, and the different name end of the first auxiliary winding of described power delivery transformer is connected with the negative pole of described DC power output end; Described first electric capacity and described first resistor coupled in parallel; The grid of described NMOS tube is connected with the first end of described second resistance, and the source electrode of described NMOS tube is through described 6th grounding through resistance; Second end of described second resistance is connected with the pulse drive signal output pin of described PWM control integration chip; The anode of described 6th diode is connected with the first end of described second resistance, and the negative electrode of described 6th diode is connected with the second end of described second resistance; The first end of described 3rd resistance is connected with the current sample input pin of described PWM control integration chip, and the second end of described 3rd resistance is connected with the described first end of the 5th resistance and the source electrode of described NMOS tube respectively; The first end of described 4th resistance is connected with the grid of described NMOS tube, the second end of described 4th resistance and the equal ground connection of the second end of described 5th resistance; The operating frequency of described PWM control integration chip arranges pin through described 7th grounding through resistance, the lower margin ground connection of described PWM control integration chip, the feedback signal input pin of described PWM control integration chip is connected with the output of described output sampling feedback circuit, and the operating voltage input pin of described PWM control integration chip is connected with described power supply circuits; The first end of described second electric capacity is connected with the current sample input pin of described PWM control integration chip, the second end ground connection of described second electric capacity.
Preferably, described power supply circuits comprise the second auxiliary winding of the 8th resistance, the 9th resistance, the tenth resistance, the 7th diode, the 3rd electrochemical capacitor and described power delivery transformer; Wherein,
The first end of described 8th resistance is connected with the first end of described first inductance, and the second end of described 8th resistance is connected with the operating voltage input pin of the negative electrode of described 7th diode, the positive pole of described 3rd electrochemical capacitor and described PWM control integration chip respectively through described 9th resistance; The minus earth of described 3rd electrochemical capacitor; The anode of described 7th diode is connected through the Same Name of Ends of described tenth resistance with the second auxiliary winding of described power delivery transformer; The different name end ground connection of the second auxiliary winding of described power delivery transformer.
Preferably, described output rectifier and filter comprises the 8th diode and the 4th electrochemical capacitor; Wherein,
The anode of described 8th diode is connected with the Same Name of Ends of first of described power delivery transformer the auxiliary winding, and the negative electrode of described 8th diode is connected with the positive pole of described DC power output end; The positive pole of described 4th electrochemical capacitor is connected with the positive pole of described DC power output end, and the negative pole of described 4th electrochemical capacitor is connected with the negative pole of described DC power output end.
Preferably, described output sampling feedback circuit comprises the 11 resistance, the 12 resistance, the 13 resistance, optocoupler, precision voltage regulator and the 3rd electric capacity; Wherein,
The first end of described 11 resistance is connected with the positive pole of described DC power output end, and the second end of described 11 resistance is connected with the anode of light-emitting diode in described optocoupler; In described optocoupler, the negative electrode of light-emitting diode is connected with the described first end of the 3rd electric capacity and the negative electrode of described precision voltage regulator respectively; The anode of described precision voltage regulator is connected with the negative pole of described DC power output end, and the reference pole of described precision voltage regulator is connected with the second end of described 3rd electric capacity; The first end of described 12 resistance is connected with the positive pole of described DC power output end, and the second end of described 12 resistance is connected with the reference pole of described precision voltage regulator and the first end of described 13 resistance respectively; Second end of described 13 resistance is connected with the negative pole of described DC power output end; In described optocoupler, the collector electrode of triode is connected with the feedback signal input pin of described PWM control integration chip, the grounded emitter of triode in described optocoupler.
The utility model also proposes a kind of Switching Power Supply, described Switching Power Supply comprises AC/DC circuit, and described AC/DC circuit comprises ac power input end, input rectifying filter circuit, input rectifying secondary filtering circuit, power conversion circuits, output rectifier and filter, output sampling feedback circuit, DC power output end and for providing the power supply circuits of operating voltage for described power conversion circuits; Wherein,
The input of described input rectifying filter circuit is connected with described ac power input end, and the output of described input rectifying filter circuit is connected with described power conversion circuits through described input rectifying secondary filtering circuit; The operating voltage input of described power conversion circuits is connected with described power supply circuits, and the output of described power conversion circuits is connected with described DC power output end through described output rectifier and filter; The input of described output sampling feedback circuit is connected with described DC power output end, and the described output of output sampling feedback circuit is connected with the FEEDBACK CONTROL input of described power conversion circuits.
The AC/DC circuit that the utility model proposes, comprises ac power input end, input rectifying filter circuit, input rectifying secondary filtering circuit, power conversion circuits, output rectifier and filter, output sampling feedback circuit, DC power output end and for providing the power supply circuits of operating voltage for described power conversion circuits; The input of described input rectifying filter circuit is connected with described ac power input end, and the output of described input rectifying filter circuit is connected with described power conversion circuits through described input rectifying secondary filtering circuit; The operating voltage input of described power conversion circuits is connected with described power supply circuits, and the output of described power conversion circuits is connected with described DC power output end through described output rectifier and filter; The input of described output sampling feedback circuit is connected with described DC power output end, and the described output of output sampling feedback circuit is connected with the FEEDBACK CONTROL input of described power conversion circuits.The utility model AC/DC circuit has the advantage that conversion efficiency is high, low in energy consumption and cost is low; Further, the utility model AC/DC circuit also has circuit structure advantage that is simple and that easily realize.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the utility model AC/DC circuit.
The realization of the utility model object, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
The utility model provides a kind of AC/DC circuit.
Fig. 1 is the electrical block diagram of the utility model AC/DC circuit.
With reference to Fig. 1, this AC/DC circuit that the present embodiment provides comprises ac power input end 101, input rectifying filter circuit 102, input rectifying secondary filtering circuit 103, power conversion circuits 104, output rectifier and filter 105, exports sampling feedback circuit 106, DC power output end 107 and for providing the power supply circuits 108 of operating voltage for described power conversion circuits.
Wherein, the input of described input rectifying filter circuit 102 is connected with described ac power input end 101, and the output of described input rectifying filter circuit 102 is connected with described power conversion circuits 104 through described input rectifying secondary filtering circuit 103; The operating voltage input of described power conversion circuits 104 is connected with described power supply circuits 108, and the output of described power conversion circuits 104 is connected with described DC power output end 107 through described output rectifier and filter 105; The input of described output sampling feedback circuit 106 is connected with described DC power output end 107, and the output of described output sampling feedback circuit 106 is connected with the FEEDBACK CONTROL input of described power conversion circuits 104.
Particularly, in the present embodiment, described input rectifying filter circuit 102 comprises the first diode D1A, the second diode D1B, the 3rd diode D1C, the 4th diode D1D and the first electrochemical capacitor E1.Wherein, the negative electrode of described first diode D1A is connected with the described anode of the second diode D1B and the live wire ACIN1 of described ac power input end 101 respectively, the anode of described first diode D1A and the equal ground connection of anode of described 3rd diode D1C; The negative electrode of described 3rd diode D1C is connected with the described anode of the 4th diode D1D and the zero line ACIN2 of described ac power input end 101 respectively; The negative electrode of described 4th diode D1D is connected with the negative electrode of described second diode D1B; The negative electrode of described second diode D1B is also connected with the positive pole of described first electrochemical capacitor E1; The minus earth of described first electrochemical capacitor E1.
In the present embodiment, described input rectifying secondary filtering circuit 103 comprises the first inductance L O1, the second inductance L O2 and the second electrochemical capacitor E2.Wherein, the first end of described first inductance L O1 is connected with the negative electrode of described second diode D1B, and second end of described first inductance L O1 is connected with the positive pole of described second electrochemical capacitor E2; The minus earth of described second electrochemical capacitor E2; The first end ground connection of described second inductance L O2, second end of described second inductance L O2 is connected with the negative pole of described second electrochemical capacitor E2.
In the present embodiment, described power conversion circuits 104 comprises the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the first electric capacity C1, the second electric capacity C2, the 5th diode D5, the 6th diode D6, NMOS tube Q1, PWM control integration chip U1 and power delivery transformer T1.Wherein, the first end of described first resistance R1 is connected with second end of described first inductance L O1, and second end of described first resistance R1 is connected with the negative electrode of described 5th diode D5; The anode of described 5th diode D5 is connected with the former different name end of limit winding S1 of described power delivery transformer T1 and the drain electrode of described NMOS tube Q1 respectively; The Same Name of Ends of the former limit winding S1 of described power delivery transformer T1 is connected with the first end of described first resistance R1; The Same Name of Ends of the first auxiliary winding S2 of described power delivery transformer T1 is connected with described output rectifier and filter 105, and the different name end of the first auxiliary winding S2 of described power delivery transformer T1 is connected with the negative pole RTN of described DC power output end 107; Described first electric capacity C1 is in parallel with described first resistance R1; The grid of described NMOS tube Q1 is connected with the first end of described second resistance R2, and the source electrode of described NMOS tube Q1 is through described 6th resistance R6 ground connection; Second end of described second resistance R2 is connected with the pulse drive signal output pin OUT of described PWM control integration chip U1; The anode of described 6th diode D6 is connected with the first end of described second resistance R2, and the negative electrode of described 6th diode D6 is connected with second end of described second resistance R2; The first end of described 3rd resistance R3 is connected with the current sample input pin CS of described PWM control integration chip U1, and second end of described 3rd resistance R3 is connected with the described first end of the 5th resistance R5 and the source electrode of described NMOS tube Q1 respectively; The first end of described 4th resistance R4 is connected with the grid of described NMOS tube Q1, second end of described 4th resistance R4 and the equal ground connection of the second end of described 5th resistance R5; The operating frequency of described PWM control integration chip U1 arranges pin RT through described 7th resistance R7 ground connection, the lower margin GND ground connection of described PWM control integration chip U1, the feedback signal input pin FB of described PWM control integration chip U1 is connected with the output of described output sampling feedback circuit 106, and the operating voltage input pin VCC of described PWM control integration chip U1 is connected with described power supply circuits 108; The first end of described second electric capacity C2 is connected with the current sample input pin CS of described PWM control integration chip U1, the second end ground connection of described second electric capacity C2.
In the present embodiment, described power supply circuits 108 comprise the second auxiliary winding T1-B of the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the 7th diode D7, the 3rd electrochemical capacitor E3 and described power delivery transformer T1.Wherein, the first end of described 8th resistance R8 is connected with the first end of described first inductance L O1, and second end of described 8th resistance R8 is connected with the operating voltage input pin VCC of the negative electrode of described 7th diode D7, the positive pole of described 3rd electrochemical capacitor E3 and described PWM control integration chip U1 respectively through described 9th resistance R9; The minus earth of described 3rd electrochemical capacitor E3; The anode of described 7th diode D7 is connected with the Same Name of Ends of the second auxiliary winding T1-B of described power delivery transformer T1 through described tenth resistance R10; The different name end ground connection of the second auxiliary winding T1-B of described power delivery transformer T1.
In the present embodiment, described output rectifier and filter 105 comprises the 8th diode D8 and the 4th electrochemical capacitor E4.Wherein, the anode of described 8th diode D8 is connected with the Same Name of Ends of first of described power delivery transformer T1 the auxiliary winding S2, and the negative electrode of described 8th diode D8 is connected with the positive pole OUT+ of described DC power output end 107; The positive pole of described 4th electrochemical capacitor E4 is connected with the positive pole OUT+ of described DC power output end 107, and the negative pole of described 4th electrochemical capacitor E4 is connected with the negative pole RTN of described DC power output end 107.
In the present embodiment, described output sampling feedback circuit 106 comprises the 11 resistance R11, the 12 resistance R12, the 13 resistance R13, optocoupler U2A, precision voltage regulator ZD and the 3rd electric capacity C3.Wherein, the first end of described 11 resistance R11 is connected with the positive pole OUT+ of described DC power output end 107, and second end of described 11 resistance R11 is connected with the anode of light-emitting diode in described optocoupler U2A; In described optocoupler U2A, the negative electrode of light-emitting diode is connected with the first end of described 3rd electric capacity C3 and the negative electrode of described precision voltage regulator ZD respectively; The anode of described precision voltage regulator ZD is connected with the negative pole RTN of described DC power output end 107, and the reference pole of described precision voltage regulator ZD is connected with second end of described 3rd electric capacity C3; The first end of described 12 resistance R12 is connected with the positive pole OUT+ of described DC power output end 107, and second end of described 12 resistance R12 is connected with the reference pole of described precision voltage regulator ZD and the first end of described 13 resistance R13 respectively; Second end of described 13 resistance R13 is connected with the negative pole RTN of described DC power output end 107; In described optocoupler U2A, the collector electrode of triode Q2 is connected with the feedback signal input pin FB of described PWM control integration chip U1, the grounded emitter of triode Q2 in described optocoupler U2A.
In the present embodiment, the feedback signal input pin FB of described PWM control integration chip U1 is the input pin of described optocoupler U2A institute feedback signal; The operating frequency of described PWM control integration chip U1 arrange pin RT be the operating frequency of described PWM control integration chip U1 pin is set, switching frequency when arranging the present embodiment AC/DC circuit full load by accessing a non-essential resistance (i.e. described 7th resistance R7) between this pin and ground; The current sample input pin CS of described PWM control integration chip U1 is used to sample rate current, to limit outside peak power output; The operating voltage input pin VCC input service voltage of described PWM control integration chip U1, for described PWM control integration chip U1 provides normal work time institute's energy requirement, this pin has OVP (overvoltage protection) function concurrently simultaneously; The pulse drive signal output pin OUT of described PWM control integration chip U1 is used for driving the switch motion of external power metal-oxide-semiconductor (i.e. described NMOS tube Q1).In the present embodiment, described PWM control integration chip U1 is the integrated chip being built-in with the multi-protective function such as OVP (overvoltage) and OTP (excess temperature), and the such as promptness of the overvoltage protection of its operating voltage input pin VCC can avoid the hysteresis phenomenon caused by the overload/overvoltage protection of outside; Further, described PWM control integration chip U1 has the little advantage of size, thus is specially adapted to need joint space-efficient Switching Power Supply;
In the present embodiment, the effect of described input rectifying filter circuit 102 is that the AC alternating current of ac power input end 101 is converted to required DC direct current, for the power conversion circuits 104 of rear class provides energy;
In the present embodiment, described input rectifying secondary filtering circuit 103, for entering a process to ripple, makes the output voltage of described input rectifying filter circuit 102 more steady;
In the present embodiment, described 8th resistance R8 in described power supply circuits 108 and described 9th resistance R9 is starting resistance, for energy required when described PWM control integration chip U1 provides startup, the second auxiliary winding T1-B of described 7th diode D7, described tenth resistance R10, described 3rd electrochemical capacitor E3 and described power delivery transformer T1 is after described PWM control integration chip U1 starts, for the normal work of described PWM control integration chip U1 provides energy;
In the present embodiment, described PWM control integration chip U1 is the Master control chip of the present embodiment AC/DC circuit, the effect of described PWM control integration chip U1 is the input/output signal of comprehensive modules, controls conducting and the cut-off of outside main switch (i.e. described NMOS tube Q1); Described second resistance R2 is the driving resistance being connected described PWM control integration chip U1 and described NMOS tube Q1, and described 4th resistance R4 is the biasing resistor of described NMOS tube; Described 3rd resistance R3, described 5th resistance R5, described 6th resistance R6 and described second electric capacity C2 form the sampling filter network of the primary current of described power delivery transformer T1, and the primary current signal of described power delivery transformer T1 is converted into the current sample input pin CS that voltage signal is delivered to described PWM control integration chip U1; Described 7th resistance R7 is that the programmable frequency of described PWM control integration chip U1 arranges resistance, for arranging the operating frequency of described PWM control integration chip U1; Described first resistance R1, described first electric capacity C1 and the 5th diode D5 form Snubber buffer network, result from the Vds peak voltage of described NMOS tube Q1 for the leakage inductance absorbed due to described power delivery transformer T1; Described 6th diode D6 is used for stablizing described NMOS tube Q1, in case stop loss bad described NMOS tube Q1;
In the present embodiment, described output rectifier and filter 105 is direct voltages of pulse triangle wave voltage for described power delivery transformer T1 is transmitted or the low ripple of trapezoidal wave photovoltaic conversion needed for the load of the present embodiment AC/DC circuit, to meet the requirement of load;
In the present embodiment, described 12 resistance R12 in described output sampling feedback circuit 106 and described 13 resistance R13 forms output voltage sampling network, and the voltage sampled is delivered to described precision voltage regulator ZD, and then and be transferred to the feedback signal input pin FB of described PWM control integration chip U1 by described optocoupler U2A.
The present embodiment adopts described PWM control integration chip U1 as main control chip, user can be made to design required Switching Power Supply simply and easily, and there is the advantage of the strong and low standby power loss of high efficiency, low-audio noise, low EMI (EMI), capacitance load capability, make the present embodiment AC/DC circuit can meet the requirement of the Energy Star of 2013.
The AC/DC circuit that the present embodiment provides, comprises ac power input end, input rectifying filter circuit, input rectifying secondary filtering circuit, power conversion circuits, output rectifier and filter, output sampling feedback circuit, DC power output end and for providing the power supply circuits of operating voltage for described power conversion circuits; The input of described input rectifying filter circuit is connected with described ac power input end, and the output of described input rectifying filter circuit is connected with described power conversion circuits through described input rectifying secondary filtering circuit; The operating voltage input of described power conversion circuits is connected with described power supply circuits, and the output of described power conversion circuits is connected with described DC power output end through described output rectifier and filter; The input of described output sampling feedback circuit is connected with described DC power output end, and the described output of output sampling feedback circuit is connected with the FEEDBACK CONTROL input of described power conversion circuits.The present embodiment AC/DC circuit has the advantage that conversion efficiency is high, low in energy consumption and cost is low; Further, the present embodiment AC/DC circuit also has circuit structure advantage that is simple and that easily realize.
The present invention also provides a kind of Switching Power Supply, and this Switching Power Supply comprises AC/DC circuit, and the circuit structure of this AC/DC circuit can refer to above-described embodiment, does not repeat them here.Naturally, the Switching Power Supply due to the present embodiment have employed the technical scheme of above-mentioned AC/DC circuit, and therefore this Switching Power Supply has all beneficial effects of above-mentioned AC/DC circuit.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model specification and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (8)
1. an AC/DC circuit, it is characterized in that, comprise ac power input end, input rectifying filter circuit, input rectifying secondary filtering circuit, power conversion circuits, output rectifier and filter, output sampling feedback circuit, DC power output end and for providing the power supply circuits of operating voltage for described power conversion circuits; Wherein,
The input of described input rectifying filter circuit is connected with described ac power input end, and the output of described input rectifying filter circuit is connected with described power conversion circuits through described input rectifying secondary filtering circuit; The operating voltage input of described power conversion circuits is connected with described power supply circuits, and the output of described power conversion circuits is connected with described DC power output end through described output rectifier and filter; The input of described output sampling feedback circuit is connected with described DC power output end, and the described output of output sampling feedback circuit is connected with the FEEDBACK CONTROL input of described power conversion circuits.
2. AC/DC circuit according to claim 1, is characterized in that, described input rectifying filter circuit comprises the first diode, the second diode, the 3rd diode, the 4th diode and the first electrochemical capacitor; Wherein,
The negative electrode of described first diode is connected with the anode of described second diode and the live wire of described ac power input end respectively, the anode of described first diode and the equal ground connection of anode of described 3rd diode; The negative electrode of described 3rd diode is connected with the described anode of the 4th diode and the zero line of described ac power input end respectively; The negative electrode of described 4th diode is connected with the negative electrode of described second diode; The negative electrode of described second diode is also connected with the positive pole of described first electrochemical capacitor; The minus earth of described first electrochemical capacitor.
3. AC/DC circuit according to claim 2, is characterized in that, described input rectifying secondary filtering circuit comprises the first inductance, the second inductance and the second electrochemical capacitor; Wherein,
The first end of described first inductance is connected with the negative electrode of described second diode, and the second end of described first inductance is connected with the positive pole of described second electrochemical capacitor; The minus earth of described second electrochemical capacitor; The first end ground connection of described second inductance, the second end of described second inductance is connected with the negative pole of described second electrochemical capacitor.
4. AC/DC circuit according to claim 3, it is characterized in that, described power conversion circuits comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the first electric capacity, the second electric capacity, the 5th diode, the 6th diode, NMOS tube, PWM control integration chip and power delivery transformer; Wherein,
The first end of described first resistance is connected with the second end of described first inductance, and the second end of described first resistance is connected with the negative electrode of described 5th diode; The anode of described 5th diode is connected with the different name end of former limit winding of described power delivery transformer and the drain electrode of described NMOS tube respectively; The Same Name of Ends of the former limit winding of described power delivery transformer is connected with the first end of described first resistance; The Same Name of Ends of the first auxiliary winding of described power delivery transformer is connected with described output rectifier and filter, and the different name end of the first auxiliary winding of described power delivery transformer is connected with the negative pole of described DC power output end; Described first electric capacity and described first resistor coupled in parallel; The grid of described NMOS tube is connected with the first end of described second resistance, and the source electrode of described NMOS tube is through described 6th grounding through resistance; Second end of described second resistance is connected with the pulse drive signal output pin of described PWM control integration chip; The anode of described 6th diode is connected with the first end of described second resistance, and the negative electrode of described 6th diode is connected with the second end of described second resistance; The first end of described 3rd resistance is connected with the current sample input pin of described PWM control integration chip, and the second end of described 3rd resistance is connected with the described first end of the 5th resistance and the source electrode of described NMOS tube respectively; The first end of described 4th resistance is connected with the grid of described NMOS tube, the second end of described 4th resistance and the equal ground connection of the second end of described 5th resistance; The operating frequency of described PWM control integration chip arranges pin through described 7th grounding through resistance, the lower margin ground connection of described PWM control integration chip, the feedback signal input pin of described PWM control integration chip is connected with the output of described output sampling feedback circuit, and the operating voltage input pin of described PWM control integration chip is connected with described power supply circuits; The first end of described second electric capacity is connected with the current sample input pin of described PWM control integration chip, the second end ground connection of described second electric capacity.
5. AC/DC circuit according to claim 4, is characterized in that, described power supply circuits comprise the second auxiliary winding of the 8th resistance, the 9th resistance, the tenth resistance, the 7th diode, the 3rd electrochemical capacitor and described power delivery transformer; Wherein,
The first end of described 8th resistance is connected with the first end of described first inductance, and the second end of described 8th resistance is connected with the operating voltage input pin of the negative electrode of described 7th diode, the positive pole of described 3rd electrochemical capacitor and described PWM control integration chip respectively through described 9th resistance; The minus earth of described 3rd electrochemical capacitor; The anode of described 7th diode is connected through the Same Name of Ends of described tenth resistance with the second auxiliary winding of described power delivery transformer; The different name end ground connection of the second auxiliary winding of described power delivery transformer.
6. AC/DC circuit according to claim 5, is characterized in that, described output rectifier and filter comprises the 8th diode and the 4th electrochemical capacitor; Wherein,
The anode of described 8th diode is connected with the Same Name of Ends of first of described power delivery transformer the auxiliary winding, and the negative electrode of described 8th diode is connected with the positive pole of described DC power output end; The positive pole of described 4th electrochemical capacitor is connected with the positive pole of described DC power output end, and the negative pole of described 4th electrochemical capacitor is connected with the negative pole of described DC power output end.
7. AC/DC circuit according to claim 6, is characterized in that, described output sampling feedback circuit comprises the 11 resistance, the 12 resistance, the 13 resistance, optocoupler, precision voltage regulator and the 3rd electric capacity; Wherein,
The first end of described 11 resistance is connected with the positive pole of described DC power output end, and the second end of described 11 resistance is connected with the anode of light-emitting diode in described optocoupler; In described optocoupler, the negative electrode of light-emitting diode is connected with the described first end of the 3rd electric capacity and the negative electrode of described precision voltage regulator respectively; The anode of described precision voltage regulator is connected with the negative pole of described DC power output end, and the reference pole of described precision voltage regulator is connected with the second end of described 3rd electric capacity; The first end of described 12 resistance is connected with the positive pole of described DC power output end, and the second end of described 12 resistance is connected with the reference pole of described precision voltage regulator and the first end of described 13 resistance respectively; Second end of described 13 resistance is connected with the negative pole of described DC power output end; In described optocoupler, the collector electrode of triode is connected with the feedback signal input pin of described PWM control integration chip, the grounded emitter of triode in described optocoupler.
8. a Switching Power Supply, is characterized in that, comprises the AC/DC circuit according to any one of claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520096513.7U CN204392101U (en) | 2015-02-10 | 2015-02-10 | AC/DC circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520096513.7U CN204392101U (en) | 2015-02-10 | 2015-02-10 | AC/DC circuit and switching power supply |
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| Publication Number | Publication Date |
|---|---|
| CN204392101U true CN204392101U (en) | 2015-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520096513.7U Expired - Fee Related CN204392101U (en) | 2015-02-10 | 2015-02-10 | AC/DC circuit and switching power supply |
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| CN (1) | CN204392101U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106612074A (en) * | 2015-10-26 | 2017-05-03 | 万国半导体(开曼)股份有限公司 | Power supply device |
| US10157702B2 (en) | 2014-12-07 | 2018-12-18 | Alpha And Omega Semiconductor (Cayman) Ltd. | Pulse transformer |
| CN117240104A (en) * | 2023-11-15 | 2023-12-15 | 广东东菱电源科技有限公司 | DC-DC isolation switch power supply circuit based on MCU control |
-
2015
- 2015-02-10 CN CN201520096513.7U patent/CN204392101U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10157702B2 (en) | 2014-12-07 | 2018-12-18 | Alpha And Omega Semiconductor (Cayman) Ltd. | Pulse transformer |
| US11127520B2 (en) | 2014-12-07 | 2021-09-21 | Alpha And Omega Semiconductor (Cayman) Ltd. | Pulse transformer |
| CN106612074A (en) * | 2015-10-26 | 2017-05-03 | 万国半导体(开曼)股份有限公司 | Power supply device |
| CN106612074B (en) * | 2015-10-26 | 2019-11-12 | 万国半导体(开曼)股份有限公司 | Power supply device |
| CN117240104A (en) * | 2023-11-15 | 2023-12-15 | 广东东菱电源科技有限公司 | DC-DC isolation switch power supply circuit based on MCU control |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150610 Termination date: 20170210 |