CN203951364U - A kind of Switching Power Supply in-line power circuit of D/A system isolation power supply - Google Patents
A kind of Switching Power Supply in-line power circuit of D/A system isolation power supply Download PDFInfo
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- CN203951364U CN203951364U CN201420400546.1U CN201420400546U CN203951364U CN 203951364 U CN203951364 U CN 203951364U CN 201420400546 U CN201420400546 U CN 201420400546U CN 203951364 U CN203951364 U CN 203951364U
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Abstract
The utility model provides a kind of Switching Power Supply in-line power circuit of D/A system isolation power supply, and it comprises voltage reduction module, Voltage stabilizing module, output module, analog circuit power supply port and digital circuit power supply port.Wherein power supply is directly powered to voltage reduction module, and the voltage after reducing is input to Voltage stabilizing module by voltage reduction module.Voltage stabilizing module stable output voltage is to output module, and output module is analog circuit and digital circuit power supply by the different port of isolation.The utility model is applicable to the work power supply of Switching Power Supply internal circuitry, and the voltage reduction module that it comprises and Voltage stabilizing module allow input voltage in very large range to change, and the output of power supply circuits is not acted upon by temperature changes.In output module of the present utility model, adopt D/A system isolation supply power mode, mutual interference while effectively reducing two system works.Visible, the utility model can be Switching Power Supply internal circuitry stable power-supplying, and shows good power source performance.
Description
Technical field
The utility model relates to switch power supply system design, in particular, and a kind of Switching Power Supply in-line power circuit design.
Background technology
Switching Power Supply is widely used in various electronic equipments at present, but the operation of the internal circuitry of Switching Power Supply needs power supply support equally.Traditional Switching Power Supply in-line power main circuit will adopt low dropout linear regulator structure.The reference voltage source of low pressure difference linear voltage regulator comprises transistor, makes the in-line power circuit volume of Switching Power Supply larger, and circuit complexity.Low pressure difference linear voltage regulator uses same port for analog module and digital circuit blocks power supply, and the signal jitter meeting that digital circuit blocks produces affects the work of analog module.For the problems referred to above, be necessary the in-line power circuit design scheme of Switching Power Supply to improve.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of Switching Power Supply in-line power circuit of D/A system isolation power supply.
The technical solution of the utility model is as follows: the Switching Power Supply in-line power circuit of D/A system isolation power supply, it comprises voltage reduction module, Voltage stabilizing module, output module, analog circuit power supply port and digital circuit power supply port.Wherein power supply is directly powered to voltage reduction module, and the voltage after reducing is input to Voltage stabilizing module by voltage reduction module.Voltage stabilizing module stable output voltage is to output module, and output module is isolated the power supply of analog circuit and digital circuit export by different port.
In the Switching Power Supply in-line power circuit of D/A system isolation power supply, voltage reduction module comprises power input mouth, common ground port, reduced output voltage port, No. 1 resistance, No. 2 resistance and No. 1 voltage stabilizing didoe.Voltage reduction module also comprises 1 to No. 6 LDMOS pipe, 1 to No. 4 metal-oxide-semiconductor.Wherein power input connects the upper end of No. 1 resistance, and connects the source electrode of No. 1 LDMOS pipe.The grid of No. 1 LDMOS pipe connects the grid of No. 2 LDMOS pipes, and the drain electrode of No. 1 LDMOS pipe connects the drain electrode of No. 4 LDMOS pipes.The source electrode of No. 2 LDMOS pipes connects power input mouth, and the drain electrode of No. 2 LDMOS pipes connects the drain electrode of No. 5 LDMOS pipes.The drain electrode of No. 3 LDMOS pipes connects the lower end of No. 1 resistance, and the source electrode of No. 3 LDMOS pipes connects the drain electrode of No. 1 metal-oxide-semiconductor.The grid of No. 4 LDMOS pipes connects the grid of No. 3 LDMOS pipes, and the source electrode of No. 4 LDMOS pipes connects the drain electrode of No. 2 metal-oxide-semiconductors.The grid of No. 5 LDMOS pipes connects the grid of No. 6 LDMOS pipes, and the source electrode of No. 5 LDMOS pipes connects the negative electrode of No. 1 diode.The drain electrode of No. 6 LDMOS pipes connects the source electrode of No. 2 LDMOS pipes, and the source electrode of No. 6 LDMOS pipes connects reduced output voltage port.
In voltage reduction module, the grid of No. 1 metal-oxide-semiconductor connects the grid of No. 2 metal-oxide-semiconductors, and the source electrode of No. 1 metal-oxide-semiconductor connects the drain electrode of No. 3 metal-oxide-semiconductors.No. 2 metal-oxide-semiconductors grid connect the source electrode of No. 3 LDMOS pipes, the source electrode of No. 2 metal-oxide-semiconductors connects the upper end of No. 2 resistance.The grid of No. 3 metal-oxide-semiconductors connects the source electrode of No. 1 metal-oxide-semiconductor, and the source electrode of No. 3 metal-oxide-semiconductors connects common ground port.The drain electrode of No. 4 metal-oxide-semiconductors connects the anode of No. 1 diode, and the source electrode of No. 4 metal-oxide-semiconductors connects common ground port.
In the Switching Power Supply in-line power circuit of D/A system isolation power supply, Voltage stabilizing module comprises step-down input port, common ground port, output end of pressure-stabilizing mouth, No. 3 resistance, No. 4 resistance, No. 5 resistance, No. 2 diodes, 1 to No. 5 metal-oxide-semiconductor.Wherein step-down input port connects the upper end of No. 3 resistance, and connects the drain electrode of No. 4 metal-oxide-semiconductors.The drain electrode of No. 1 metal-oxide-semiconductor connects the lower end of No. 3 resistance, and the grid of No. 1 metal-oxide-semiconductor connects the grid of No. 2 metal-oxide-semiconductors.The drain electrode of No. 2 metal-oxide-semiconductors connects the drain electrode of No. 4 metal-oxide-semiconductors, and the source electrode of No. 2 metal-oxide-semiconductors connects the upper end of No. 4 resistance.The drain electrode of No. 3 metal-oxide-semiconductors connects the source electrode of No. 1 metal-oxide-semiconductor, and the source electrode of No. 3 metal-oxide-semiconductors connects common ground port.The grid of No. 4 metal-oxide-semiconductors connects the grid of No. 5 metal-oxide-semiconductors, and the source electrode of No. 4 metal-oxide-semiconductors connects step-down input port.The grid of No. 5 metal-oxide-semiconductors connects the drain electrode of No. 2 metal-oxide-semiconductors, and the drain electrode of No. 5 metal-oxide-semiconductors connects output end of pressure-stabilizing mouth.The negative electrode of No. 2 diodes connects the drain electrode of No. 5 metal-oxide-semiconductors, the upper end of No. 5 resistance of anodic bonding of No. 2 diodes.The lower end of No. 5 resistance connects common ground port.
In the Switching Power Supply in-line power circuit of D/A system isolation power supply, output module comprises step-down input port, voltage stabilizing input port, common ground port, analog circuit power supply port, digital circuit power supply port, No. 1 metal-oxide-semiconductor, No. 2 metal-oxide-semiconductors, No. 6 resistance, No. 1 electric capacity.Wherein step-down input port connects the drain electrode of No. 1 metal-oxide-semiconductor, and voltage stabilizing input port connects the grid of No. 1 metal-oxide-semiconductor.The source electrode of No. 1 metal-oxide-semiconductor connects digital circuit supply port, and connects the upper end of No. 6 resistance.The source electrode of No. 2 metal-oxide-semiconductors connects the source electrode of No. 1 metal-oxide-semiconductor, the drain electrode connecting analog circuit supply port of No. 2 metal-oxide-semiconductors.The upper end of No. 1 electric capacity connects the drain electrode of No. 2 metal-oxide-semiconductors, and the lower end of No. 1 electric capacity connects the grid of No. 2 metal-oxide-semiconductors.The lower end of No. 6 resistance connects the grid of No. 2 metal-oxide-semiconductors, and connects common ground port.
The utility model is applicable to the work power supply of Switching Power Supply internal circuitry.The voltage reduction module that it comprises and Voltage stabilizing module allow input voltage in very large range to change, and the output of power supply circuits is not acted upon by temperature changes.In output module of the present utility model, adopt analog circuitry system and digital circuitry supply power mode respectively, mutual interference while effectively reducing two system works.Owing to not using reference voltage source structure in circuit design, the volume of circuit and complexity all obviously reduce.Visible, the utility model can be Switching Power Supply internal circuitry stable power-supplying in the situation that of circuit volume and reduced complexity, and shows good power source performance.
Brief description of the drawings
Fig. 1 is module relationship block diagram of the present utility model;
Fig. 2 is voltage reduction module circuit structure diagram of the present utility model;
Fig. 3 is Voltage stabilizing module circuit structure diagram of the present utility model;
Fig. 4 is output module circuit structure diagram of the present utility model;
Fig. 5 is total system circuit structure diagram of the present utility model;
Fig. 6 is the utility model output voltage waveform under different operating condition.
Embodiment
For the ease of understanding the utility model, below in conjunction with the drawings and specific embodiments, the utility model is described in detail.In this specification and accompanying drawing thereof, provided preferred embodiment of the present utility model, still, the utility model can be realized in many different forms, is not limited to the described embodiment of this specification.On the contrary, providing the object of these embodiment is to make to the understanding of disclosure of the present utility model more thoroughly comprehensively.
It should be noted that, when a certain element is fixed on another element, comprise this element is directly fixed on to this another element, or this element is fixed on to this another element by least one other element placed in the middle.When an element connects another element, comprise this element is directly connected to this another element, or this element is connected to this another element by least one other element placed in the middle.
As shown in Figure 1, the Switching Power Supply in-line power circuit of D/A system isolation power supply, it comprises voltage reduction module, Voltage stabilizing module, output module, analog circuit power supply port and digital circuit power supply port.Wherein power supply provides voltage Vin for voltage reduction module, and the voltage Vlw after reducing is input to Voltage stabilizing module by voltage reduction module.Voltage stabilizing module stable output voltage Vtz is to output module, and output module is isolated the supply power voltage Avdd of analog circuit and digital circuit and Dvdd export by different port.
As shown in Figure 2, voltage reduction module comprises power input mouth VIN, common ground port VSS, reduced output voltage port VLW, resistance R 1, resistance R 2 and voltage stabilizing didoe D1.Voltage reduction module also comprises LDMOS pipe MD1 to MD6, metal-oxide-semiconductor ML1 to ML4.The wherein upper end of power input mouth VIN contact resistance R1, and connect the source electrode of LDMOS pipe MD1.The grid of LDMOS pipe MD1 connects the grid of LDMOS pipe MD2, and the drain electrode of LDMOS pipe MD1 connects the drain electrode of LDMOS pipe MD4.The source electrode of LDMOS pipe MD2 connects power input mouth VIN, and the drain electrode of LDMOS pipe MD2 connects the drain electrode of LDMOS pipe MD5.The lower end of the drain electrode contact resistance R1 of LDMOS pipe MD3, the source electrode of LDMOS pipe MD3 connects the drain electrode of metal-oxide-semiconductor ML1.The grid of LDMOS pipe MD4 connects the grid of LDMOS pipe MD3, and the source electrode of LDMOS pipe MD4 connects the drain electrode of metal-oxide-semiconductor ML2.The grid of LDMOS pipe MD5 connects the grid of LDMOS pipe MD6, and the source electrode of LDMOS pipe MD5 connects the negative electrode of diode D1.The drain electrode of LDMOS pipe MD6 connects the source electrode of LDMOS pipe MD2, and the source electrode of LDMOS pipe MD6 connects reduced output voltage port VLW.
In voltage reduction module, the grid of metal-oxide-semiconductor ML1 connects the grid of metal-oxide-semiconductor ML2, and the source electrode of metal-oxide-semiconductor ML1 connects the drain electrode of metal-oxide-semiconductor ML3.Metal-oxide-semiconductor ML2 grid connect the source electrode of LDMOS pipe MD3, the upper end of the source electrode contact resistance R2 of metal-oxide-semiconductor ML2.The grid of metal-oxide-semiconductor ML3 connects the source electrode of metal-oxide-semiconductor ML1, and the source electrode of metal-oxide-semiconductor ML3 connects common ground port VSS.The drain electrode of metal-oxide-semiconductor ML4 connects the anode of diode D1, and the source electrode of metal-oxide-semiconductor ML4 connects common ground port VSS.
As shown in Figure 3, Voltage stabilizing module comprises step-down input port VLW, common ground port VSS, output end of pressure-stabilizing mouth VTZ, resistance R 3, resistance R 4, resistance R 5, diode D2, metal-oxide-semiconductor MS1 to MS5.The wherein upper end of step-down input port VLW contact resistance R3, and connect the drain electrode of metal-oxide-semiconductor MS4.The lower end of the drain electrode contact resistance R3 of metal-oxide-semiconductor MS1, the grid of metal-oxide-semiconductor MS1 connects the grid of metal-oxide-semiconductor MS2.The drain electrode of metal-oxide-semiconductor MS2 connects the drain electrode of metal-oxide-semiconductor MS4, the upper end of the source electrode contact resistance R4 of metal-oxide-semiconductor MS2.The drain electrode of metal-oxide-semiconductor MS3 connects the source electrode of metal-oxide-semiconductor MS1, and the source electrode of metal-oxide-semiconductor MS3 connects common ground port VSS.The grid of metal-oxide-semiconductor MS4 connects the grid of metal-oxide-semiconductor MS5, and the source electrode of metal-oxide-semiconductor MS4 connects step-down input port VLW.The grid of metal-oxide-semiconductor MS5 connects the drain electrode of metal-oxide-semiconductor MS2, and the drain electrode of metal-oxide-semiconductor MS5 connects output end of pressure-stabilizing mouth VTZ.The negative electrode of diode D2 connects the drain electrode of metal-oxide-semiconductor MS5, the upper end of the anodic bonding resistance R 5 of diode D2.The lower end of resistance R 5 connects common ground port VSS.
As shown in Figure 4, output module comprises step-down input port VLW, voltage stabilizing input port VTZ, common ground port VSS, analog circuit power supply port AVDD, digital circuit power supply port DVDD, metal-oxide-semiconductor MT1, metal-oxide-semiconductor MT2, resistance R 6, capacitor C 1.Wherein step-down input port VLW connects the drain electrode of metal-oxide-semiconductor MT1, and voltage stabilizing input port VTZ connects the grid of metal-oxide-semiconductor MT1.The source electrode of metal-oxide-semiconductor MT1 connects digital circuit supply port DVDD, and the upper end of contact resistance R6.The source electrode of metal-oxide-semiconductor MT2 connects the source electrode of metal-oxide-semiconductor MT1, the drain electrode connecting analog circuit supply port AVDD of metal-oxide-semiconductor MT2.The upper end of capacitor C 1 connects the drain electrode of metal-oxide-semiconductor MT2, and the lower end of capacitor C 1 connects the grid of metal-oxide-semiconductor MT2.The lower end of resistance R 6 connects the grid of metal-oxide-semiconductor MT2, and connects common ground port VSS.
As shown in Figure 5, the total system of Switching Power Supply in-line power circuit comprises three modules.Wherein power supply provides the input voltage of wide region by power input mouth VIN for voltage reduction module.The output port VLW output mos pipe of voltage reduction module can bear voltage Vlw, and the value of Vlw is Vd1+Vml4.Wherein Vd1 is the pressure drop of voltage stabilizing didoe D1, and Vml4 is the voltage difference of grid and the source electrode of metal-oxide-semiconductor ML4.
Voltage reduction module is exported as inputing to Voltage stabilizing module, and two modules connect by port VLW.Voltage stabilizing module stable output voltage Vtz, and the value of Vtz is Vd2+Vx × R5/R4.Wherein Vd2 is the pressure drop of voltage stabilizing didoe D2, the threshold voltage that Vx is metal-oxide-semiconductor, the resistance that R4 and R5 are corresponding resistor.
Output module is connected by port VTZ with Voltage stabilizing module.Voltage stabilizing module is isolated power port and analog circuit power supply port of digital circuit by metal-oxide-semiconductor MT2 and capacitor C 1.The supply power voltage value of output module is Vd2-(1-R5/R4) × Vx, and wherein Vd2 is the pressure drop of voltage stabilizing didoe D2, the threshold voltage that Vx is metal-oxide-semiconductor, the resistance that R4 and R5 are corresponding resistor.Because the size of the supply power voltage of output module is only determined by circuit preset parameter, thus its stable output and be subject to variation of ambient temperature and impact that input voltage changes very little.
As shown in Figure 6, when supply voltage Vin is 15V, port DVDD output current is 2mA, and port AVDD output current is 6mA, within the scope of the variation of ambient temperature of-40 degrees Celsius to 150 degrees Celsius, the output voltage of Switching Power Supply in-line power circuit changes as shown in Fig. 6 left side.Fig. 6 left side has shown that respectively the output voltage of digital circuit power supply port DVDD and analog circuit power supply port AVDD changes.Can be found out that by curve in figure the excursion of two-port output voltage is in 11mV left and right, the impact of the output voltage of the variation of visible ambient temperature on Switching Power Supply in-line power circuit is minimum.
Claims (8)
1. a Switching Power Supply in-line power circuit for D/A system isolation power supply, is characterized in that, it comprises voltage reduction module, Voltage stabilizing module, output module, analog circuit power supply port and digital circuit power supply port;
Power supply is directly powered to voltage reduction module, and the voltage after reducing is input to Voltage stabilizing module by voltage reduction module;
Voltage stabilizing module stable output voltage is to output module; Output module is isolated the power supply of analog circuit and digital circuit export by different port.
2. the Switching Power Supply in-line power circuit that D/A system isolation is powered according to claim 1, is characterized in that, voltage reduction module comprises power input mouth, common ground port, reduced output voltage port, No. 1 resistance, No. 2 resistance and No. 1 voltage stabilizing didoe;
Voltage reduction module also comprises 1 to No. 6 LDMOS pipe, 1 to No. 4 metal-oxide-semiconductor.
3. the Switching Power Supply in-line power circuit that D/A system isolation is powered according to claim 2, is characterized in that, power input connects the upper end of No. 1 resistance, and connects the source electrode of No. 1 LDMOS pipe;
The grid of No. 1 LDMOS pipe connects the grid of No. 2 LDMOS pipes, and the drain electrode of No. 1 LDMOS pipe connects the drain electrode of No. 4 LDMOS pipes;
The source electrode of No. 2 LDMOS pipes connects power input mouth, and the drain electrode of No. 2 LDMOS pipes connects the drain electrode of No. 5 LDMOS pipes;
The drain electrode of No. 3 LDMOS pipes connects the lower end of No. 1 resistance, and the source electrode of No. 3 LDMOS pipes connects the drain electrode of No. 1 metal-oxide-semiconductor;
The grid of No. 4 LDMOS pipes connects the grid of No. 3 LDMOS pipes, and the source electrode of No. 4 LDMOS pipes connects the drain electrode of No. 2 metal-oxide-semiconductors;
The grid of No. 5 LDMOS pipes connects the grid of No. 6 LDMOS pipes, and the source electrode of No. 5 LDMOS pipes connects the negative electrode of No. 1 diode;
The drain electrode of No. 6 LDMOS pipes connects the source electrode of No. 2 LDMOS pipes, and the source electrode of No. 6 LDMOS pipes connects reduced output voltage port.
4. the Switching Power Supply in-line power circuit that D/A system isolation is powered according to claim 2, is characterized in that, the grid of No. 1 metal-oxide-semiconductor connects the grid of No. 2 metal-oxide-semiconductors, and the source electrode of No. 1 metal-oxide-semiconductor connects the drain electrode of No. 3 metal-oxide-semiconductors;
No. 2 metal-oxide-semiconductors grid connect the source electrode of No. 3 LDMOS pipes, the source electrode of No. 2 metal-oxide-semiconductors connects the upper end of No. 2 resistance;
The grid of No. 3 metal-oxide-semiconductors connects the source electrode of No. 1 metal-oxide-semiconductor, and the source electrode of No. 3 metal-oxide-semiconductors connects common ground port;
The drain electrode of No. 4 metal-oxide-semiconductors connects the anode of No. 1 diode, and the source electrode of No. 4 metal-oxide-semiconductors connects common ground port.
5. the Switching Power Supply in-line power circuit that D/A system isolation is powered according to claim 1, it is characterized in that, Voltage stabilizing module comprises step-down input port, common ground port, output end of pressure-stabilizing mouth, No. 3 resistance, No. 4 resistance, No. 5 resistance, No. 2 diodes, 1 to No. 5 metal-oxide-semiconductor.
6. the Switching Power Supply in-line power circuit that D/A system isolation is powered according to claim 5, is characterized in that, step-down input port connects the upper end of No. 3 resistance, and connects the drain electrode of No. 4 metal-oxide-semiconductors;
The drain electrode of No. 1 metal-oxide-semiconductor connects the lower end of No. 3 resistance, and the grid of No. 1 metal-oxide-semiconductor connects the grid of No. 2 metal-oxide-semiconductors;
The drain electrode of No. 2 metal-oxide-semiconductors connects the drain electrode of No. 4 metal-oxide-semiconductors, and the source electrode of No. 2 metal-oxide-semiconductors connects the upper end of No. 4 resistance;
The drain electrode of No. 3 metal-oxide-semiconductors connects the source electrode of No. 1 metal-oxide-semiconductor, and the source electrode of No. 3 metal-oxide-semiconductors connects common ground port;
The grid of No. 4 metal-oxide-semiconductors connects the grid of No. 5 metal-oxide-semiconductors, and the source electrode of No. 4 metal-oxide-semiconductors connects step-down input port;
The grid of No. 5 metal-oxide-semiconductors connects the drain electrode of No. 2 metal-oxide-semiconductors, and the drain electrode of No. 5 metal-oxide-semiconductors connects output end of pressure-stabilizing mouth;
The negative electrode of No. 2 diodes connects the drain electrode of No. 5 metal-oxide-semiconductors, the upper end of No. 5 resistance of anodic bonding of No. 2 diodes;
The lower end of No. 5 resistance connects common ground port.
7. the Switching Power Supply in-line power circuit that D/A system isolation is powered according to claim 1, it is characterized in that, output module comprises step-down input port, voltage stabilizing input port, common ground port, analog circuit power supply port, digital circuit power supply port, No. 1 metal-oxide-semiconductor, No. 2 metal-oxide-semiconductors, No. 6 resistance, No. 1 electric capacity.
8. the Switching Power Supply in-line power circuit that D/A system isolation is powered according to claim 7, is characterized in that, step-down input port connects the drain electrode of No. 1 metal-oxide-semiconductor, and voltage stabilizing input port connects the grid of No. 1 metal-oxide-semiconductor;
The source electrode of No. 1 metal-oxide-semiconductor connects digital circuit supply port, and connects the upper end of No. 6 resistance;
The source electrode of No. 2 metal-oxide-semiconductors connects the source electrode of No. 1 metal-oxide-semiconductor, the drain electrode connecting analog circuit supply port of No. 2 metal-oxide-semiconductors;
The upper end of No. 1 electric capacity connects the drain electrode of No. 2 metal-oxide-semiconductors, and the lower end of No. 1 electric capacity connects the grid of No. 2 metal-oxide-semiconductors;
The lower end of No. 6 resistance connects the grid of No. 2 metal-oxide-semiconductors, and connects common ground port.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420400546.1U CN203951364U (en) | 2014-07-21 | 2014-07-21 | A kind of Switching Power Supply in-line power circuit of D/A system isolation power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420400546.1U CN203951364U (en) | 2014-07-21 | 2014-07-21 | A kind of Switching Power Supply in-line power circuit of D/A system isolation power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104079172A (en) * | 2014-07-21 | 2014-10-01 | 许昌学院 | High-stability internal power supply circuit suitable for switching power supply |
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2014
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104079172A (en) * | 2014-07-21 | 2014-10-01 | 许昌学院 | High-stability internal power supply circuit suitable for switching power supply |
| CN104079172B (en) * | 2014-07-21 | 2018-02-13 | 许昌学院 | Suitable for the high stability in-line power circuit of Switching Power Supply |
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