CN207301842U - A kind of linear DC power supply and the resistance adjustment circuit for linear DC power supply - Google Patents
A kind of linear DC power supply and the resistance adjustment circuit for linear DC power supply Download PDFInfo
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- CN207301842U CN207301842U CN201721247734.5U CN201721247734U CN207301842U CN 207301842 U CN207301842 U CN 207301842U CN 201721247734 U CN201721247734 U CN 201721247734U CN 207301842 U CN207301842 U CN 207301842U
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Abstract
A kind of resistance adjustment circuit the utility model discloses linear DC power supply and for linear DC power supply, belongs to power technique fields.The circuit includes coarse tune digital potentiometer, fine setting digital regulation resistance, smooth resistance and electronic switch, connects again with coarse tune digital potentiometer with fine setting digital regulation resistance parallel connection after the smooth resistance and electronic switch series connection.Linear DC power supply includes microcontroller, voltage drive module and voltage sample module, the voltage drive module includes foregoing resistance adjustment circuit, electronic switch, fine setting digital regulation resistance and coarse tune digital potentiometer and monolithic mechatronics in the resistance adjustment circuit.Change of the DC power output voltage from 4V 39V can be made by the change in resistance of the break-make and coarse tune digital potentiometer of electronic switch, fine setting digital regulation resistance in resistance adjustment circuit, the change pressure difference of each step is 0.03v, it is sufficient to meets a variety of application demands.
Description
Technical field
Power technique fields are the utility model is related to, more particularly to a kind of linear DC power supply and for linear DC power supply
Resistance adjustment circuit.
Background technology
It is to adjust output voltage, in theory, mechanical potentiometer using mechanical potentiometer that traditional DC power supply, which adjusts circuit,
There is the resolution ratio of infinite height, but true resolution depends on the structure of potentiometer, multiturn potentiometer when high-precision, price
It is expensive;Upper using, mechanical potentiometer need to be adjusted with instrument, be inconvenient;Mechanical potentiometer has mechanical contact, and contact is resistance
Property, numerical value has uncertainty;Although mechanical potentiometer has good leakproofness, resistance value is easily protected from environmental, more holds
Easily vibrated and impact influence, poor reliability.
Existing DC power supply includes microcontroller, voltage drive module and voltage sample module etc., voltage drive module bag
Include resistance adjustment circuit.As shown in Figure 1, voltage drive module includes driving chip, protection circuit, filter circuit and mechanical current potential
Device Rf etc., driving chip U include triode and mos switching tubes etc. can export different voltages, protection according to resistor network ratio
Circuit and filter circuit include capacitance C1, C2, C3, C4 and C5, resistance R, inductance L and diode D.Output voltage VO UT=K* (1+
R/Rf), K is constant, and the resistance value of resistance R is constant, only changes the resistance value of mechanical potentiometer Rf, it is possible to adjust output voltage
VOUT。
Digital regulation resistance can not provide unlimited resolution ratio, but suitable resolution ratio may be selected to specific application, and
Resolution ratio be it is normalized, it is repeatable, it is guaranteed.Therefore, this patent uses digitlization of the digital regulation resistance as power supply
Adjust.
The content of the invention
The first purpose of this patent is that providing a kind of resistance adjustment circuit for linear DC power supply is used to replace Rf,
Make change of the DC power output voltage from 4v-39v, the change pressure difference of each step is 0.03v, it is sufficient to meets a variety of application need
Ask.The second purpose of this patent is to provide a kind of linear DC power supply, which can use as signal generator, exportable
High current and continuously linear change.The technical solution is as follows:
On the one hand, the utility model embodiment provides a kind of resistance adjustment circuit for linear DC power supply, the electricity
Resistance, which adjusts circuit, includes coarse tune digital potentiometer, fine setting digital regulation resistance, smooth resistance and electronic switch, the smooth resistance and
Connect again with coarse tune digital potentiometer with fine setting digital regulation resistance parallel connection after electronic switch series connection.
Wherein, the fine setting digital regulation resistance in the utility model embodiment and coarse tune digital potentiometer are 256 grades of 10k numbers
Word potentiometer, the resistance value of the smooth resistance is 0.1k Ω.
Specifically, the fine setting digital regulation resistance in the utility model embodiment and coarse tune digital potentiometer are by one piece
MCP42010 chips are realized.
Wherein, the electronic switch in the utility model embodiment is NMOS tube.
On the other hand, the utility model embodiment provides a kind of linear DC power supply, including microcontroller, voltage driving mould
Block and voltage sample module, the voltage drive module include being previously described for the resistance adjustment circuit of linear DC power supply, institute
State the electronic switch in resistance adjustment circuit, finely tune digital regulation resistance and coarse tune digital potentiometer and monolithic mechatronics.
Wherein, the microcontroller in the utility model embodiment is according to the voltage of predeterminated voltage and voltage sample module feedback
Voltage difference exports the duty cycle of PWM ripples to adjust, and the voltage drive module receives the PWM ripples of microcontroller output and according to PWM
Ripple adjusts its output voltage.
Further, the linear power supply in the utility model embodiment further includes input module, communication module and display mould
Block, the input module, communication module and display module and monolithic mechatronics.
The technical solution that the utility model embodiment provides has the beneficial effect that:The utility model provides a kind of be used for linearly
The resistance adjustment circuit of DC power supply is used to replace Rf, which includes coarse tune digital potentiometer, fine setting numeral electricity
Position device, smooth resistance and electronic switch, after smooth resistance and electronic switch series connection it is in parallel with fine setting digital regulation resistance again with coarse adjustment
Digital regulation resistance is connected, can by the change in resistance of the break-make and coarse tune digital potentiometer of electronic switch, fine setting digital regulation resistance
So that DC power output voltage changes from 4V-39V, the change pressure difference of each step is only 0.03V, it is sufficient to meets a variety of application need
Ask.In addition, linear DC power supply provided in this embodiment can be used as signal generator, the electric current of exportable maximum 8A can
Export sawtooth waveforms, staircase waveform, sine wave, square wave constant power signal source.
Brief description of the drawings
It is required in being described below to embodiment in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some realities of the utility model
Example is applied, for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the circuit diagram of existing resistance adjustment circuit;
Fig. 2 is the functional block diagram for the resistance adjustment circuit for linear DC power supply that the utility model embodiment provides;
Fig. 3 is the circuit diagram for the resistance adjustment circuit that the utility model embodiment provides;
Fig. 4 is the functional block diagram for the linear DC power supply that the utility model embodiment provides.
Embodiment
It is new to this practicality below in conjunction with attached drawing to make the purpose of this utility model, technical solution and advantage clearer
Type embodiment is described in further detail.
Embodiment 1
Referring to Fig. 2 and 3, embodiment 1 provides a kind of resistance adjustment circuit for linear DC power supply, the resistance adjustment
Circuit P(For replacing the Rf in attached drawing 1)Including coarse tune digital potentiometer, fine setting digital regulation resistance, smooth resistance and electronic cutting
Close, it is in parallel with fine setting digital regulation resistance after the series connection of smooth resistance and electronic switch, circuit after parallel connection again with coarse tune digital current potential
Device is connected.Wherein, smooth resistance is used to the big resistance value jump change of digital regulation resistance being converted into very fine and smooth change in resistance,
Accurately to control output voltage.Coarse tune digital potentiometer and fine setting digital regulation resistance control change in resistance by microcontroller.Electronic cutting
Close and be used to control the structure for changing fine setting digital regulation resistance circuit by microcontroller, it is desirable to which its resistance value is smaller.
Specifically, when exporting small magnitude of voltage, disconnecting electronic switch makes fine setting digital regulation resistance and coarse tune digital current potential
Device is connected, and resistance value is the resistance value of resistance value+fine setting digital regulation resistance of coarse tune digital potentiometer;When exporting big voltage,
Enabled electronic switch makes smooth resistance in parallel with fine setting digital regulation resistance, and total resistance value is the resistance value of coarse tune digital potentiometer
+(Finely tune the parallel resistance value of the resistance value of digital regulation resistance and the resistance value of smooth resistance).Wherein, finely tune digital regulation resistance and
Coarse tune digital potentiometer can be identical or differs, and is preferably identical in order to realizing;In order to reach degree of regulation, number is finely tuned
Word potentiometer and coarse tune digital potentiometer are 128 grades or 256 grades contour grade digital regulation resistances;Preferably, number is at least finely tuned
Word potentiometer is 256 grades.
Wherein, the fine setting digital regulation resistance in the utility model embodiment and coarse tune digital potentiometer are 256 grades of 10k
(Ω)Digital regulation resistance, the resistance value of smooth resistance is 0.1k Ω.Certainly digital regulation resistance, coarse tune digital current potential are finely tuned as needed
The resistance value of device and smooth resistance can also be other values.
Specifically, the voltage of the pressure regulation IC inputs of conventional power supply is 8-40v, can be transferred to 1.25v-39.4v in theory,
The change voltage difference of each step is design calculated value for 0.03v, or even can also accomplish 0.01v.Specifically, resistance R in circuit
Resistance value be 39K, according to formula VOUT=1.25* (1+R/Rf), the then VOUT=1.25* (1+R/P) of the present embodiment, output voltage
Change from 4V-39V, the Standard resistance range that can calculate resistance adjustment circuit P is:1.258k-17.7k the numeral electricity of 2 10K
The resistance value of position device can realize change of the resistance value in the range of 1.258k-17.7k by foregoing circuit, and output voltage
Excursion is positive and negative 0.03v.
Specifically, the fine setting digital regulation resistance in the utility model embodiment and coarse tune digital potentiometer are by one piece
Two groups of digital regulation resistances in MCP42010 chips are realized.Certainly, as needed can also use other series, resistance value size and
The a series of digital regulation resistance of the digital regulation resistance of model, such as MCP, X9313, MAX5402.
Wherein, the electronic switch in the utility model embodiment is NMOS tube.
More specifically, have the 10K digital regulation resistances of two groups of independence in MCP42010, and every group of 256 grades of resistance adjustments, every grade
About 39 Europe of resistance;Electronic switch uses NMOS tube, and conducting resistance only has 0.003 Europe(3 milliohms), after NMOS tube conducting, 100 Europe
Resistance and fine setting digital regulation resistance are in parallel, and 39 Europe of fine setting digital regulation resistance stage resistive and 100 Europe parallel connection resistance values are:28 Europe, two
The Europe of level resistance 39x2=78 and 100 Europe parallel connection resistance values are:43.8 Europe, the Europe of three-level resistance 39x3=117 and 100 Europe parallel connection resistance values are:
53.9 Europe, up to 255 grades and the resistance value of 100 Europe parallel connection.Its result is as shown in table 1-4:
Table 1
Series | Resistance value | Series | Resistance value | Series | Resistance value | Series | Resistance value |
1 | 28.05 | 17 | 86.89 | 33 | 92.79 | 49 | 95.02 |
2 | 43.82 | 18 | 87.53 | 34 | 92.98 | 50 | 95.12 |
3 | 53.91 | 19 | 88.1 | 35 | 93.17 | 51 | 95.21 |
4 | 60.93 | 20 | 88.63 | 36 | 93.35 | 52 | 95.3 |
5 | 66.1 | 21 | 89.11 | 37 | 93.51 | 53 | 95.38 |
6 | 70.05 | 22 | 89.56 | 38 | 93.67 | 54 | 95.46 |
7 | 73.19 | 23 | 89.96 | 39 | 93.83 | 55 | 95.54 |
8 | 75.72 | 24 | 90.34 | 40 | 93.97 | 56 | 95.62 |
9 | 77.82 | 25 | 90.69 | 41 | 94.11 | 57 | 95.69 |
10 | 79.59 | 26 | 91.02 | 42 | 94.24 | 58 | 95.76 |
11 | 81.09 | 27 | 91.32 | 43 | 94.37 | 59 | 95.83 |
12 | 82.39 | 28 | 91.61 | 44 | 94.49 | 60 | 95.9 |
13 | 83.52 | 29 | 91.61 | 45 | 94.6 | 61 | 95.96 |
14 | 84.52 | 30 | 91.87 | 46 | 94.72 | 62 | 96.02 |
15 | 85.4 | 31 | 92.12 | 47 | 94.82 | 63 | 96.08 |
16 | 86.18 | 32 | 92.36 | 48 | 94.92 | 64 | 96.14 |
Table 2
Series | Resistance value | Series | Resistance value | Series | Resistance value | Series | Resistance value |
65 | 96.2 | 81 | 96.93 | 97 | 97.42 | 113 | 97.78 |
66 | 96.26 | 82 | 96.96 | 98 | 97.45 | 114 | 97.8 |
67 | 96.31 | 83 | 97 | 99 | 97.47 | 115 | 97.81 |
68 | 96.36 | 84 | 97.03 | 100 | 97.5 | 116 | 97.83 |
69 | 96.41 | 85 | 97.07 | 101 | 97.52 | 117 | 97.85 |
70 | 96.46 | 86 | 97.1 | 102 | 97.54 | 118 | 97.87 |
71 | 96.51 | 87 | 97.13 | 103 | 97.57 | 119 | 97.89 |
72 | 96.56 | 88 | 97.16 | 104 | 97.59 | 120 | 97.9 |
73 | 96.6 | 89 | 97.19 | 105 | 97.61 | 121 | 97.92 |
74 | 96.65 | 90 | 97.22 | 106 | 97.63 | 122 | 97.94 |
75 | 96.69 | 91 | 97.25 | 107 | 97.65 | 123 | 97.95 |
76 | 96.73 | 92 | 97.28 | 108 | 97.68 | 124 | 97.97 |
77 | 96.77 | 93 | 97.31 | 109 | 97.7 | 125 | 97.98 |
78 | 96.81 | 94 | 97.34 | 110 | 97.72 | 126 | 98 |
79 | 96.85 | 95 | 97.37 | 111 | 97.74 | 127 | 98.02 |
80 | 96.89 | 96 | 97.39 | 112 | 97.76 | 128 | 98.03 |
Table 3
Series | Resistance value | Series | Resistance value | Series | Resistance value | Series | Resistance value |
129 | 98.05 | 145 | 98.26 | 161 | 98.43 | 177 | 98.57 |
130 | 98.06 | 146 | 98.27 | 162 | 98.44 | 178 | 98.57 |
131 | 98.08 | 147 | 98.28 | 163 | 98.45 | 179 | 98.58 |
132 | 98.09 | 148 | 98.29 | 164 | 98.46 | 180 | 98.59 |
133 | 98.1 | 149 | 98.3 | 165 | 98.46 | 181 | 98.6 |
134 | 98.12 | 150 | 98.31 | 166 | 98.47 | 182 | 98.61 |
135 | 98.13 | 151 | 98.33 | 167 | 98.48 | 183 | 98.61 |
136 | 98.14 | 152 | 98.34 | 168 | 98.49 | 184 | 98.62 |
137 | 98.16 | 153 | 98.35 | 169 | 98.5 | 185 | 98.63 |
138 | 98.17 | 154 | 98.36 | 170 | 98.51 | 186 | 98.64 |
139 | 98.18 | 155 | 98.37 | 171 | 98.52 | 187 | 98.64 |
140 | 98.2 | 156 | 98.38 | 172 | 98.53 | 188 | 98.65 |
141 | 98.21 | 157 | 98.39 | 173 | 98.53 | 189 | 98.66 |
142 | 98.22 | 158 | 98.4 | 174 | 98.54 | 190 | 98.66 |
143 | 98.23 | 159 | 98.41 | 175 | 98.55 | 191 | 98.67 |
144 | 98.25 | 160 | 98.42 | 176 | 98.56 | 192 | 98.68 |
Table 4
Series | Resistance value | Series | Resistance value | Series | Resistance value | Series | Resistance value |
193 | 98.68 | 209 | 98.78 | 225 | 98.87 | 241 | 98.94 |
194 | 98.68 | 210 | 98.78 | 226 | 98.87 | 242 | 98.95 |
195 | 98.69 | 211 | 98.79 | 227 | 98.88 | 243 | 98.95 |
196 | 98.7 | 212 | 98.8 | 228 | 98.88 | 244 | 98.96 |
197 | 98.71 | 213 | 98.81 | 229 | 98.89 | 245 | 98.96 |
198 | 98.72 | 214 | 98.82 | 230 | 98.89 | 246 | 98.96 |
199 | 98.72 | 215 | 98.82 | 231 | 98.9 | 247 | 98.97 |
200 | 98.73 | 216 | 98.82 | 232 | 98.9 | 248 | 98.97 |
201 | 98.74 | 217 | 98.83 | 233 | 98.91 | 249 | 98.98 |
202 | 98.74 | 218 | 98.83 | 234 | 98.91 | 250 | 98.98 |
203 | 98.75 | 219 | 98.84 | 235 | 98.92 | 251 | 98.98 |
204 | 98.75 | 220 | 98.84 | 236 | 98.92 | 252 | 98.99 |
205 | 98.76 | 221 | 98.85 | 237 | 98.92 | 253 | 98.99 |
206 | 98.77 | 222 | 98.85 | 238 | 98.93 | 254 | 99 |
207 | 98.77 | 223 | 98.86 | 239 | 98.93 | 255 | 99 |
208 | 98.78 | 224 | 98.86 | 240 | 98.94 | - | - |
The resistance level that can be seen that fine setting digital regulation resistance from table 1-4 is higher(Resistance value is big)With 100 Europe resistor coupled in parallel
Change in resistance is smaller, this just provides possibility for output voltage excursion very little, and output voltage can accomplish very high precision.
For example 12.2v voltages are exported, according to formula:VOUT=1.25* (1+R/P) can calculate total resistance of digital regulation resistance
It is worth and is:4.452k, the roughly adjusted rheostat value of coarse tune digital potentiometer:112(Level)X39=4368, finely tune the resistance value of digital regulation resistance
For:The Europe of 4452-4368=84, the 1-4 that tables look-up obtains 13 grade of 83.52 Europe, actual to calculate output voltage:VOUT=1.25*(1+39000/
(4368+83.52))=12.2013v, the 12.2v errors with design requirement are only:0.0013v, due to MCP42010 numeral current potentials
The Standard resistance range of device is 8-12K, and error is big, in practical applications, the magnitude of voltage of microcontroller real-time sampling output voltage and setting
Difference, adjust output voltage in real time, make output voltage as close as setting magnitude of voltage.Small magnitude of voltage is exported, by electricity
Sub switch disconnects, and only allows coarse tune digital potentiometer and fine setting digital regulation resistance to be connected.Any one given output voltage values(Scope
4v-39v)Its equivalent resistance can by coarse tune digital potentiometer, fine setting digital regulation resistance and smooth resistance combination come
Very closely realize and be almost continuously to change.
Embodiment 2
Referring to Fig. 2-4, embodiment 2 provides a kind of linear DC power supply, which includes microcontroller, voltage
Drive module and voltage sample module etc., voltage drive module include the resistance for linear DC power supply that embodiment 1 provides
Circuit is adjusted, the electronic switch, fine setting digital regulation resistance and coarse tune digital potentiometer in foregoing resistance adjustment circuit are and monolithic
Mechatronics.
Wherein, the microcontroller in the utility model embodiment is according to the voltage of predeterminated voltage and voltage sample module feedback
Voltage difference adjusts the ratio of resistor network, and voltage drive module adjusts its output voltage according to the ratio of resistor network.
As shown in figure 3, voltage drive module includes driving chip, protection circuit, filter circuit and resistance adjustment circuit P
Include triode and mos switching tubes etc. Deng, driving chip U different voltages can be exported according to resistor network ratio, protect circuit
Include capacitance C1, C2, C3, C4 and C5, resistance R, inductance L and diode D with filter circuit.Output voltage VO UT=K* (1+R/
P), K is constant, and the resistance value of resistance R is constant, only changes the resistance value of resistance adjustment circuit P(Adjust coarse tune digital potentiometer, fine setting
Digital regulation resistance and opening and closing electronic switch), it is possible to adjust output voltage VO UT.
Wherein, the voltage sample module in the present embodiment includes voltage sampling circuit, voltage sampling circuit detection output
Voltage and with monolithic mechatronics.
Further, the power supply in the utility model embodiment further includes input module, communication module and display module etc.,
Input module, communication module and display module with monolithic mechatronics.Certainly, this power supply further includes other modules, such as power supply
Module, the power module give other module for power supply as needed.Wherein, communication module is specially RS232/RS485 communication chips,
For setting output waveform;Input module is specially 8 road input terminals, for setting output waveform, is specifically as follows button;Display
Module, is specially digital-scroll technique, for showing the parameters such as working method and current voltage value.
The present embodiment realizes the linear convergent rate of power supply by varying resistance adjustment mode, which can be defeated by adjusting
Go out the electric current that voltage changes load, can be used as power signal generator, the waveform of common signal generator output is only
It is a small-signal, load-carrying poor ability, the supply current to load is usually milliampere rank, this power supply is sent out as signal
Raw device uses, and can provide the electric current of 8,000 milliamperes of ranks, and carrying load ability is extremely strong.The power supply can be used as step power supply, sawtooth
Ripple power supply, PWM ripples power supply, sine-wave power and staircase waveform power supply etc., available for the speed governing of DC fan, the tune of direct current generator
Speed, the brilliance control of LED light etc..
Specific embodiment of the present utility model described above, does not form the restriction to scope of protection of the utility model.
The various other corresponding changes and deformation that any technical concept according to the present utility model is made, should be included in this practicality
In new scope of the claims.
Claims (7)
1. a kind of resistance adjustment circuit for linear DC power supply, it is characterised in that including coarse tune digital potentiometer, fine setting number
Word potentiometer, smooth resistance and electronic switch, the smooth resistance and electronic switch are in parallel with fine setting digital regulation resistance after connecting
Connect again with coarse tune digital potentiometer.
2. the resistance adjustment circuit according to claim 1 for linear DC power supply, it is characterised in that the fine setting number
Word potentiometer and coarse tune digital potentiometer are 256 grades of 10k digital regulation resistances, and the resistance value of the smooth resistance is 0.1k Ω.
3. the resistance adjustment circuit according to claim 2 for linear DC power supply, it is characterised in that the fine setting number
Word potentiometer and coarse tune digital potentiometer are realized by one piece of MCP42010 chip.
4. the resistance adjustment circuit according to claim 1 for linear DC power supply, it is characterised in that the electronic cutting
Close as NMOS tube.
5. a kind of linear DC power supply, including microcontroller, voltage drive module and voltage sample module, it is characterised in that described
Voltage drive module is included such as claim 1-4 any one of them resistance adjustment circuits, the electricity in the resistance adjustment circuit
Sub switch, fine setting digital regulation resistance and coarse tune digital potentiometer and monolithic mechatronics.
6. linear DC power supply according to claim 5, it is characterised in that the microcontroller is according to predeterminated voltage and voltage
The voltage difference of the voltage of sampling module feedback adjusts the ratio of resistor network, and the voltage drive module is according to resistor network
Ratio adjusts its output voltage.
7. linear DC power supply according to claim 5, it is characterised in that the linear DC power supply further includes input mould
Block, communication module and display module, the input module, communication module and display module and monolithic mechatronics.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN110846702A (en) * | 2019-12-20 | 2020-02-28 | 湖南化工职业技术学院 | Stainless steel electrochemical coloring potential control device |
CN111025945A (en) * | 2019-12-20 | 2020-04-17 | 沈阳兴华华亿轨道交通电器有限公司 | Variable resistance analog circuit and parameter design method of variable resistance analog circuit |
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2017
- 2017-09-27 CN CN201721247734.5U patent/CN207301842U/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110846702A (en) * | 2019-12-20 | 2020-02-28 | 湖南化工职业技术学院 | Stainless steel electrochemical coloring potential control device |
CN111025945A (en) * | 2019-12-20 | 2020-04-17 | 沈阳兴华华亿轨道交通电器有限公司 | Variable resistance analog circuit and parameter design method of variable resistance analog circuit |
CN110846702B (en) * | 2019-12-20 | 2024-04-05 | 湖南化工职业技术学院 | Stainless steel electrochemical coloring potential control device |
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