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 PDF

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Publication number
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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resistance
power supply
linear
voltage
adjustment circuit
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CN201721247734.5U
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鄢平
鄢嘉怡
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Wuhan Wonder Electronic Co Ltd
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Wuhan Wonder Electronic Co Ltd
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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

A kind of linear DC power supply and the resistance adjustment circuit for linear DC power supply
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.
CN201721247734.5U 2017-09-27 2017-09-27 A kind of linear DC power supply and the resistance adjustment circuit for linear DC power supply Expired - Fee Related CN207301842U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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