CN204304817U - The non-linear negative feedback switching power supply of a kind of beam excitation formula - Google Patents
The non-linear negative feedback switching power supply of a kind of beam excitation formula Download PDFInfo
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- CN204304817U CN204304817U CN201420717113.9U CN201420717113U CN204304817U CN 204304817 U CN204304817 U CN 204304817U CN 201420717113 U CN201420717113 U CN 201420717113U CN 204304817 U CN204304817 U CN 204304817U
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Abstract
The utility model discloses the non-linear negative feedback switching power supply of a kind of beam excitation formula, primarily of diode rectifier U, power amplifier P1, transformer T, be serially connected in the switched filter circuit between diode rectifier U and power amplifier P1, the power output circuit be connected with the secondary coil L2 of transformer T, the transformation feedback circuit be connected with the secondary coil L3 of transformer T, the non-linear negative-feedback circuit be connected with transformation feedback circuit, the PWM controller be connected with power amplifier P1, and output is connected with the tap on the primary coil L1 of transformer T, and the sliding damper that input is connected with the output of power amplifier P1 forms.The utility model utilizes the nonlinear characteristic of non-linear negative-feedback circuit, adjustable pipe is made automatically to be in edge, saturation region, not only effectively reduce circuit self and external radio frequency interference, but also greatly simplify circuit structure, cost of manufacture and maintenance cost are had reduction by a relatively large margin.
Description
Technical field
The utility model relates to a kind of switching power supply, specifically refers to the non-linear negative feedback switching power supply of a kind of beam excitation formula.
Background technology
Along with continuous progress scientific and technological at present, electronic product also brings great convenience to people are in life while function from strength to strength.Voltage stabilizing circuit is just runed and gives birth to, and traditional series connection linear regulator type voltage stabilizing circuit has the features such as stability is high, output voltage is adjustable, ripple coefficient is little, circuit is simple.But the Correctional tube of these series connection linear regulator type voltage stabilizing circuits is always operating at magnifying state, and have electric current to flow through, therefore the power consumption of its pipe is comparatively large, the efficiency of circuit is not high, generally can only reach about 30% ~ 50% always.In order to overcome above-mentioned defect, people just have developed switching mode voltage stabilizing circuit.
In switching mode voltage stabilizing circuit, surge pipe is operated on off state, pipe alternation saturated with cut-off two states in.When pipe saturation conduction, though it is large to flow through pipe current, but tube voltage drop is very little; When pipe ends, tube voltage drop is large, but the electric current flow through is close to zero.Therefore, under power output the same terms, the efficiency of switching mode voltage stabilizer coin series regulator is high, generally can reach about 80% ~ 90%.But it is comparatively large that the switching mode voltage stabilizer that current people adopt but exists ripple coefficient, when Correctional tube constantly switches between saturated and cut-off state, radio frequency interference can be produced to circuit, circuit more complicated and cost is higher.
Utility model content
The purpose of this utility model is the defect that ripple coefficient is comparatively large, radio frequency interference is serious, circuit is complicated and efficiency is not high overcoming the existence of current switching mode voltage stabilizer, provides a kind of beam excitation formula non-linear negative feedback switching power supply.
The purpose of this utility model is achieved through the following technical solutions: the non-linear negative feedback switching power supply of a kind of beam excitation formula, primarily of diode rectifier U, power amplifier P1, transformer T, be serially connected in the switched filter circuit between diode rectifier U and power amplifier P1, the power output circuit be connected with the secondary coil L2 of transformer T, the transformation feedback circuit be connected with the secondary coil L3 of transformer T, the non-linear negative-feedback circuit be connected with transformation feedback circuit, the PWM controller be connected with power amplifier P1, and output is connected with the tap on the primary coil L1 of transformer T, and the sliding damper that input is connected with the output of power amplifier P1 forms.Meanwhile, between the cathode output end and PWM controller of diode rectifier U, beam excitation formula logic amplifying circuit is also serially connected with, described beam excitation formula logic amplifying circuit is primarily of power amplifier P2, NAND gate IC1, NAND gate IC2, NAND gate IC3, negative pole is connected with the in-phase end of power amplifier P2, the polar capacitor C11 of positive pole ground connection after optical diode D6, one end is connected with the positive pole of polar capacitor C11, the resistance R11 of other end ground connection after diode D7, positive pole is connected with the tie point of diode D7 with resistance R11, the polar capacitor C10 of minus earth, one end is connected with the negative input of NAND gate IC1, the resistance R12 that the other end is connected with the in-phase end of power amplifier P2, be serially connected in the resistance R13 between the end of oppisite phase of power amplifier P2 and output, one end is connected with the output of NAND gate IC1, the resistance R14 that the other end is connected with the negative input of NAND gate IC3, positive pole is connected with the output of NAND gate IC2, the electric capacity C9 that negative pole is connected with the negative input of NAND gate IC3, and one end is connected with the positive pole of polar capacitor C10, the resistance R15 that the other end is connected with the negative input of NAND gate IC2 forms, the electrode input end of described NAND gate IC1 is connected with the end of oppisite phase of power amplifier P2, and its output is connected with the electrode input end of NAND gate IC2, the electrode input end of NAND gate IC3 is connected with the output of power amplifier P2, and its output is then connected with an input of PWM controller, the positive pole of polar capacitor C11 is then connected with the cathode output end of diode rectifier U, described non-linear negative-feedback circuit is by resistance R3, resistance R4, diode D4, diode D5, and transistor bridge circuits composition, the output of described power amplifier P1 is connected with one end of resistance R4 with the output of transformation feedback circuit and resistance R3 respectively, and the other end of resistance R3 is connected with transistor bridge circuits after diode D4, the other end of resistance R4 is connected with transistor bridge circuits after diode D5.
Further, described transistor bridge circuits is by triode Q2, triode Q3, one end is connected with the collector electrode of triode Q2, the resistance R5 that the other end is connected with the base stage of triode Q3 after resistance R6, one end is connected with the collector electrode of triode Q3, the resistance R8 that the other end is connected with the base stage of triode Q2 after resistance R7, positive pole is connected with the collector electrode of triode Q2, the electric capacity C6 that negative pole is connected with the base stage of triode Q3, negative pole is connected with the collector electrode of triode Q3, the electric capacity C7 that positive pole is connected with the base stage of transistor Q2, and one end is connected with the base stage of transistor Q2, the resistance R9 of the external+6V power supply of the other end is connected with the base stage of one end with transistor Q3, the resistance R10 of the external+6V power supply of the other end forms, the collector electrode of described transistor Q2 is connected with the tie point of diode D4 with resistance R3, its grounded emitter, the collector electrode of described transistor Q3 is connected with the tie point of diode D5 with resistance R4, its grounded emitter.
Described switched filter circuit is by triode Q1, and electric capacity C1, electric capacity C2, resistance R1, resistance R2 and diode D1 form; The base stage of described triode Q1 forms loop with its collector electrode in turn after resistance R2, diode D1 and resistance R1, and electric capacity C1 and resistance R1 is in parallel, and electric capacity C2 and resistance R2 is in parallel; The collector electrode of triode Q1 is connected with the cathode output end of diode rectifier U, its grounded emitter; Resistance R2 is then connected with the in-phase end of power amplifier P1 with the tie point of diode D1; The primary coil L1 of transformer T is then in parallel with diode D1.
The diode D2 that described power output circuit is connected with the Same Name of Ends of secondary coil L2 by P pole, N pole is connected with the non-same polarity of secondary coil L2 after electric capacity C3, and the inductance L 4 that one end is connected with the N pole of diode D2, the other end is connected with the non-same polarity of secondary coil L2 after electric capacity C4 forms.
Described transformation feedback circuit is made up of diode D3 and electric capacity C5; The P pole of described diode D3 is connected with the non-same polarity of secondary coil L3, its N pole is connected with the Same Name of Ends of secondary coil L3 after electric capacity C5, the Same Name of Ends ground connection of described secondary coil L3.
The utility model comparatively prior art is compared, and has the following advantages and beneficial effect:
(1) the utility model make use of the controlling functions of PWM fully, can automatically regulate electric power output voltage value according to duty ratio, guarantees the stable of output valve.
(2) the utility model utilizes the nonlinear characteristic of non-linear negative-feedback circuit, adjustable pipe is made automatically to be in edge, saturation region, not only effectively reduce circuit self and external radio frequency interference, but also greatly simplify circuit structure, cost of manufacture and maintenance cost are had reduction by a relatively large margin.
(3) the utility model effectively can overcome the late effect of Switching Power Supply, can effectively improve Switching Power Supply sensitivity.
(4) the utility model can reduce the ripple coefficient of switching mode voltage stabilizer significantly, makes power quality more reliable and stable.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present utility model.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
Embodiment
As shown in Figure 1, non-linear degenerative unsaturation formula switching power supply described in the utility model includes diode rectifier U, power amplifier P1, transformer T, switched filter circuit, power output circuit, transformation feedback circuit, PWM controller, sliding damper, non-linear negative-feedback circuit and beam excitation formula logic amplifying circuit.Wherein, transformer T is by the primary coil L1 being arranged on former limit, and the secondary coil L2 and the secondary coil L3 that are arranged on secondary form.The utility model is provided with a sliding tap on the primary coil L1 of transformer T, this sliding tap is then controlled by sliding damper, to guarantee to adjust turn ratio between the primary coil L1 of transformer T and secondary coil L2 and secondary coil L3 according to the duty ratio of PWM controller.
The input of diode rectifier U is used for the civil power of external 220V, between the cathode output end that switched filter circuit is then serially connected in this diode rectifier U and the in-phase end of power amplifier P1.As shown in Figure 1, this switched filter circuit is by triode Q1, and electric capacity C1, electric capacity C2, resistance R1, resistance R2 and diode D1 form.Wherein, the base stage of triode Q1 forms loop with its collector electrode in turn after resistance R2, diode D1 and resistance R1.Electric capacity C1 and resistance R1 is in parallel, and electric capacity C2 and resistance R2 is in parallel, to form typical RC filter circuit.Meanwhile, the collector electrode of triode Q1 is connected with the cathode output end of diode rectifier U, its grounded emitter.Resistance R2 is then connected with the in-phase end of power amplifier P1 with the tie point of diode D1.Primary coil L1 and the diode D1 of described transformer T are in parallel.
In this switched filter circuit, resistance R1, electric capacity C1 and diode D1 form feedback-clamp circuit, can improve the peak-inverse voltage of conversion efficiency and reduction power amplifier P1 in-phase end.
Power output circuit is used for output dc voltage, and it is made up of diode D2, electric capacity C3, inductance L 4 and electric capacity C4.During connection, the P pole of diode D2 is connected with the Same Name of Ends of secondary coil L2, and its N pole is connected with the non-same polarity of secondary coil L2 after electric capacity C3.One end of described inductance L 4 is connected with the N pole of diode D2, the other end is connected with the non-same polarity of secondary coil L2 after electric capacity C4.The two ends of electric capacity C4 are then the output of power supply, for being connected with the load of outside.
Transformation feedback circuit is used for providing feedback voltage for non-linear negative-feedback circuit, and it is made up of diode D3 and electric capacity C5.During connection, the P pole of described diode D3 is connected with the non-same polarity of secondary coil L3, its N pole is connected with the Same Name of Ends of secondary coil L3 after electric capacity C5, the Same Name of Ends ground connection of described secondary coil L3.
Described beam excitation formula logic amplifying circuit is by power amplifier P2, NAND gate IC1, NAND gate IC2, NAND gate IC3, negative pole is connected with the in-phase end of power amplifier P2, the polar capacitor C11 of positive pole ground connection after optical diode D6, one end is connected with the positive pole of polar capacitor C11, the resistance R11 of other end ground connection after diode D7, positive pole is connected with the tie point of diode D7 with resistance R11, the polar capacitor C10 of minus earth, one end is connected with the negative input of NAND gate IC1, the resistance R12 that the other end is connected with the in-phase end of power amplifier P2, be serially connected in the resistance R13 between the end of oppisite phase of power amplifier P2 and output, one end is connected with the output of NAND gate IC1, the resistance R14 that the other end is connected with the negative input of NAND gate IC3, positive pole is connected with the output of NAND gate IC2, the electric capacity C9 that negative pole is connected with the negative input of NAND gate IC3, and one end is connected with the positive pole of polar capacitor C10, the resistance R15 that the other end is connected with the negative input of NAND gate IC2 forms.
Meanwhile, the electrode input end of described NAND gate IC1 is connected with the end of oppisite phase of power amplifier P2, and its output is connected with the electrode input end of NAND gate IC2; The electrode input end of NAND gate IC3 is connected with the output of power amplifier P2, and its output is then connected with an input of PWM controller; The positive pole of polar capacitor C11 is then connected with the cathode output end of diode rectifier U.For guaranteeing effect of the present utility model, another input also ground connection after electric capacity C8 of described PWM controller, the output of PWM controller is then connected with the end of oppisite phase of power amplifier P1.
Described non-linear negative-feedback circuit is by resistance R3, resistance R4, diode D4, diode D5, and transistor bridge circuits composition.During connection, the output of power amplifier P1 is connected with one end of resistance R4 with the output of transformation feedback circuit and resistance R3 respectively, and the other end of resistance R3 is connected with transistor bridge circuits after diode D4, the other end of resistance R4 is connected with transistor bridge circuits after diode D5.Namely the output of power amplifier P1 will be connected with the tie point of electric capacity C5 with diode D3, simultaneously, resistance R3 also will be connected with the tie point of electric capacity C5 with diode D3 with one end of resistance R4, to guarantee that whole non-linear negative-feedback circuit can obtain feedback voltage from electric capacity C5.
Described transistor bridge circuits is by triode Q2, and triode Q3, resistance R5, resistance R6, electric capacity C6, resistance R7, resistance R8, electric capacity C7 and resistance R9 and resistance R10 form.During connection, one end of resistance R5 is connected with the collector electrode of triode Q2, and its other end is connected with the base stage of triode Q3 after resistance R6.And one end of resistance R8 is connected with the collector electrode of triode Q3, its other end is connected with the base stage of triode Q2 after resistance R7.
The positive pole of electric capacity C6 is connected with the collector electrode of triode Q2, and its negative pole is connected with the base stage of triode Q3; The negative pole of electric capacity C7 is connected with the collector electrode of triode Q3, and its positive pole is connected with the base stage of transistor Q2.One end of resistance R9 is connected with the base stage of transistor Q2, the external+6V power supply of its other end; One end of resistance R10 is connected with the base stage of transistor Q3, the external+6V power supply of its other end.
One end of resistance R3 is connected with the tie point of electric capacity C5 with the output of power amplifier P1, the input of sliding damper and diode D3 simultaneously, and its other end is connected with the tie point of resistance R8 with resistance R7 after diode D4; In like manner, one end of resistance R4 is also connected with the tie point of electric capacity C5 with the output of power amplifier P1, the input of sliding damper and diode D3 simultaneously, and its other end is connected with the tie point of resistance R6 with resistance R5 after diode D5.
The collector electrode of described transistor Q2 is connected with the tie point of diode D4 with resistance R3, its grounded emitter; The collector electrode of described transistor Q3 is connected with the tie point of diode D5 with resistance R4, its grounded emitter.
Transistor bridge circuits of the present utility model is symmetrical structure, during use, by turn-on transistor Q2 and transistor Q3, and rely on negative feedback original paper diode D4 and diode D5 automatically to regulate transistor Q2 and transistor Q3 to be in edge, saturation region, thus provide enough driving voltages for sliding damper, and regulate the tap of transformer T primary coil L1 according to the duty ratio of PWM controller, and then change the turn ratio of primary transformer coil L1 and secondary coil L2 and secondary coil L3.
As mentioned above, just the utility model can well be realized.
Claims (5)
1. the non-linear negative feedback switching power supply of beam excitation formula, primarily of diode rectifier U, power amplifier P1, transformer T, be serially connected in the switched filter circuit between diode rectifier U and power amplifier P1, the power output circuit be connected with the secondary coil L2 of transformer T, the transformation feedback circuit be connected with the secondary coil L3 of transformer T, the non-linear negative-feedback circuit be connected with transformation feedback circuit, the PWM controller be connected with power amplifier P1, and output is connected with the tap on the primary coil L1 of transformer T, and the sliding damper that input is connected with the output of power amplifier P1 forms, it is characterized in that, beam excitation formula logic amplifying circuit is also serially connected with between the cathode output end and PWM controller of diode rectifier U, described beam excitation formula logic amplifying circuit is primarily of power amplifier P2, NAND gate IC1, NAND gate IC2, NAND gate IC3, negative pole is connected with the in-phase end of power amplifier P2, the polar capacitor C11 of positive pole ground connection after optical diode D6, one end is connected with the positive pole of polar capacitor C11, the resistance R11 of other end ground connection after diode D7, positive pole is connected with the tie point of diode D7 with resistance R11, the polar capacitor C10 of minus earth, one end is connected with the negative input of NAND gate IC1, the resistance R12 that the other end is connected with the in-phase end of power amplifier P2, be serially connected in the resistance R13 between the end of oppisite phase of power amplifier P2 and output, one end is connected with the output of NAND gate IC1, the resistance R14 that the other end is connected with the negative input of NAND gate IC3, positive pole is connected with the output of NAND gate IC2, the electric capacity C9 that negative pole is connected with the negative input of NAND gate IC3, and one end is connected with the positive pole of polar capacitor C10, the resistance R15 that the other end is connected with the negative input of NAND gate IC2 forms, the electrode input end of described NAND gate IC1 is connected with the end of oppisite phase of power amplifier P2, and its output is connected with the electrode input end of NAND gate IC2, the electrode input end of NAND gate IC3 is connected with the output of power amplifier P2, and its output is then connected with an input of PWM controller, the positive pole of polar capacitor C11 is then connected with the cathode output end of diode rectifier U, described non-linear negative-feedback circuit is by resistance R3, resistance R4, diode D4, diode D5, and transistor bridge circuits composition, the output of described power amplifier P1 is connected with one end of resistance R4 with the output of transformation feedback circuit and resistance R3 respectively, and the other end of resistance R3 is connected with transistor bridge circuits after diode D4, the other end of resistance R4 is connected with transistor bridge circuits after diode D5.
2. the non-linear negative feedback switching power supply of a kind of beam excitation formula according to claim 1, it is characterized in that, described transistor bridge circuits is by triode Q2, triode Q3, one end is connected with the collector electrode of triode Q2, the resistance R5 that the other end is connected with the base stage of triode Q3 after resistance R6, one end is connected with the collector electrode of triode Q3, the resistance R8 that the other end is connected with the base stage of triode Q2 after resistance R7, positive pole is connected with the collector electrode of triode Q2, the electric capacity C6 that negative pole is connected with the base stage of triode Q3, negative pole is connected with the collector electrode of triode Q3, the electric capacity C7 that positive pole is connected with the base stage of transistor Q2, and one end is connected with the base stage of transistor Q2, the resistance R9 of the external+6V power supply of the other end is connected with the base stage of one end with transistor Q3, the resistance R10 of the external+6V power supply of the other end forms, the collector electrode of described transistor Q2 is connected with the tie point of diode D4 with resistance R3, its grounded emitter, the collector electrode of described transistor Q3 is connected with the tie point of diode D5 with resistance R4, its grounded emitter.
3. the non-linear negative feedback switching power supply of a kind of beam excitation formula according to claim 1 and 2, is characterized in that, described switched filter circuit is by triode Q1, and electric capacity C1, electric capacity C2, resistance R1, resistance R2 and diode D1 form; The base stage of described triode Q1 forms loop with its collector electrode in turn after resistance R2, diode D1 and resistance R1, and electric capacity C1 and resistance R1 is in parallel, and electric capacity C2 and resistance R2 is in parallel; The collector electrode of triode Q1 is connected with the cathode output end of diode rectifier U, its grounded emitter; Resistance R2 is then connected with the in-phase end of power amplifier P1 with the tie point of diode D1; The primary coil L1 of transformer T is then in parallel with diode D1.
4. the non-linear negative feedback switching power supply of a kind of beam excitation formula according to claim 3, it is characterized in that, the diode D2 that described power output circuit is connected with the Same Name of Ends of secondary coil L2 by P pole, N pole is connected with the non-same polarity of secondary coil L2 after electric capacity C3, and the inductance L 4 that one end is connected with the N pole of diode D2, the other end is connected with the non-same polarity of secondary coil L2 after electric capacity C4 forms.
5. the non-linear negative feedback switching power supply of a kind of beam excitation formula according to claim 4, it is characterized in that, described transformation feedback circuit is made up of diode D3 and electric capacity C5; The P pole of described diode D3 is connected with the non-same polarity of secondary coil L3, its N pole is connected with the Same Name of Ends of secondary coil L3 after electric capacity C5, the Same Name of Ends ground connection of described secondary coil L3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420717113.9U CN204304817U (en) | 2014-11-25 | 2014-11-25 | The non-linear negative feedback switching power supply of a kind of beam excitation formula |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420717113.9U CN204304817U (en) | 2014-11-25 | 2014-11-25 | The non-linear negative feedback switching power supply of a kind of beam excitation formula |
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| Publication Number | Publication Date |
|---|---|
| CN204304817U true CN204304817U (en) | 2015-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420717113.9U Expired - Fee Related CN204304817U (en) | 2014-11-25 | 2014-11-25 | The non-linear negative feedback switching power supply of a kind of beam excitation formula |
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| CN (1) | CN204304817U (en) |
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2014
- 2014-11-25 CN CN201420717113.9U patent/CN204304817U/en not_active Expired - Fee Related
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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 |
Granted publication date: 20150429 Termination date: 20151125 |