CN102195480B - Wide-range high-precision low-noise automatic range direct current power source - Google Patents
Wide-range high-precision low-noise automatic range direct current power source Download PDFInfo
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- CN102195480B CN102195480B CN 201110052699 CN201110052699A CN102195480B CN 102195480 B CN102195480 B CN 102195480B CN 201110052699 CN201110052699 CN 201110052699 CN 201110052699 A CN201110052699 A CN 201110052699A CN 102195480 B CN102195480 B CN 102195480B
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Abstract
The invention provides a wide-range high-precision low-noise automatic range direct current power source, which comprises a preceding stage power source and a central processing unit (CPU) control circuit, and also comprises a step-down circuit. The step-down circuit comprises a metal oxide semiconductor (MOS) tube Q1, a diode D1, an energy storage inductor L1, a load resistor R4, a current sampling resistor R5, a capacitor C3, an output capacitor C2, a driving circuit and a pulse width modulation (PWM) circuit, so that the wide high-voltage or high-current output capacity of the high-voltage/low-current or the high-current/low-voltage can be realized under power source output power at certain power in a power source cabinet in a certain volume, and high-speed and adjustable dropping characteristic of the output voltage or the output current can be achieved.
Description
Technical field
The present invention relates to a kind of DC power supply product, especially relate to a kind of automatic range DC power supply of wide region high accuracy low noise.
Background technology
In electronic leaning laboratory, owing to need to be used for the multiple different product of test, the power supply of selecting for use usually need have certain surplus, because be difficult to reckon with the various test requests that may occur in the future under normal conditions.So, present situation is exactly in the market, the power supply that a lot of laboratories must be equipped with a plurality of models is realized testing requirement, because conventional DC power supply comprises linear power supply and Switching Power Supply, the isolating transformer of linear power supply and the high frequency transformer of Switching Power Supply play dual parts electrical isolation and power delivery, its power output capacity all is to be proportional to its magnetic core sectional area and the area of coiling window, for the transformer of determining, the maximum power of its transmission is subject to the net sectional area of magnetic core and the area of coiling window, this max power constraint the product of its output voltage electric current, if need bigger output current under certain output voltage, transformer that must be bigger just, need higher cost and change bigger transformer, and need bigger cabinet to place, namely take lab space, the waste testing cost, cause the trouble of wiring again, because mean for the engineer, a kind of product of every test just needs to change a kind of power supply.On the whole, the power supply that the voltage/current range ability narrow defective of this type of power supply product in the market in certain power bracket causes the client need buy many different capacities is realized test request, raising and the wasting of resources of purchasing the power supply cost have been caused, simultaneously the frequent inconvenience of changing the power operation ten minutes.
Summary of the invention
The objective of the invention is to solve in the small size cabinet, realize the output services scope of high voltage/low current very broad in certain power bracket or low-voltage/high electric current, and realize power supply faster, the output voltage of tunable characteristic or the falling characteristic of output current.
To achieve these goals, the invention provides a kind of automatic range DC power supply of wide region high accuracy low noise, level power supply and cpu control circuit before comprising, also comprise reduction voltage circuit, described reduction voltage circuit comprises metal-oxide-semiconductor Q1, diode D1, accumulation of energy inductance L 1, load resistance R4, current sampling resistor R5, capacitor C 3, output capacitance C2, drive circuit, pwm circuit;
The drain electrode of metal-oxide-semiconductor Q1 is connected with the output cathode of preceding level power supply, and an end of an output of source electrode and drive circuit, the negative pole of diode D1 and accumulation of energy inductance L 1 is connected, and the other end of grid and drive circuit is connected;
The positive pole of the end of the other end of accumulation of energy inductance L 1 and load resistance R4, an end of capacitor C 3 and output capacitance C2 is connected, and is used for the output cathode as the automatic range power supply;
Output negative pole and the positive pole of diode D1, the other end of load resistance R4, the other end of capacitor C 3 and the end of current sampling resistor R5 of preceding level power supply are connected;
The other end of current sampling resistor R5 is connected with the negative pole of output capacitance C2, is used for the output negative pole as the automatic range power supply;
The input of pwm circuit receives voltage or the electric current comparison signal of cpu control circuit and exports pwm pulse to the input of drive circuit, is connected source electrode and the grid of metal-oxide-semiconductor Q1 more respectively by the output of drive circuit, the break-make of control metal-oxide-semiconductor Q1.
Comprise that also at least one electronic load, electronic load comprise metal-oxide-semiconductor Q2, electronic load error amplifier and current-limiting resistance R6;
The drain electrode of metal-oxide-semiconductor Q2 is connected with the positive pole of output capacitance C2, grid is connected with the output of electronic load error amplifier, the end of source electrode and current-limiting resistance R6 is connected with the negative terminal of electronic load operational amplifier, and the other end of current-limiting resistance R6 is connected with the negative pole of preceding level power supply;
Cpu control circuit is connected with the positive input terminal of electronic load error amplifier, is used for the break-make of control metal-oxide-semiconductor Q2.
Described cpu control circuit comprises current error amplifier, voltage error amplifier, electronic load reference voltage circuit, divider resistance R1, R2, R3, triode Q3, PWM status comparator, state comparative level end and electronic load enable signal end;
The output of PWM status comparator is connected with the base stage of triode Q3, the base stage of triode Q3 is provided with electronic load enable signal end, the emitter of triode Q3 is connected with the negative pole of automatic range power supply, the collector electrode of the triode Q3 divider resistance R2 that is connected in series successively, behind the R3, positive input terminal with the electronic load error amplifier is connected again, the end of divider resistance R1 is connected divider resistance R2, between the R3, the other end is connected with the electronic load reference voltage circuit, an input of PWM status comparator is set to state comparative level end, and another input is connected with the output of current error amplifier and voltage error amplifier;
The current error amplifier input terminal is connected in parallel on the two ends of current sampling resistor R5, after gathering the input of current signal by current error amplifier out input pwm circuit, outputed to the input of drive circuit again by the output of pwm circuit, by the break-make of drive circuit output signal control metal-oxide-semiconductor Q1;
The input of voltage error amplifier is connected in parallel on the two ends of output capacitance C2, after collecting the input of voltage signal by the output input pwm circuit of voltage error amplifier, outputed to the input of drive circuit again by the output of pwm circuit, by the break-make of drive circuit output signal control metal-oxide-semiconductor Q1;
The output of the output of current error amplifier, the big device in voltage error side links to each other with the input of pwm circuit.
Pwm circuit comprises the PWM comparator, and the input of PWM comparator is the input of pwm circuit.
Cross-over connection has the capacitor C 1 of absorption on the drain electrode of metal-oxide-semiconductor Q1 and the source electrode.
Preceding level power supply is ordinary tap power supply or conventional linear power supply.
Operation principle of the present invention is to have increased the one-level reduction voltage circuit on the signal output part basis of ordinary tap power supply or conventional linear power supply, by break-make and the size of utilizing accumulation of energy inductance L 1 control output voltage or output current of control metal-oxide-semiconductor Q1.When the output signal value that receives when the PWM comparator in the pwm circuit and the error voltage of set point comparison are lower than (or being higher than) a certain value, the PWM comparator will be adjusted the PWM output pulse width to 0%(or 100%), metal-oxide-semiconductor Q1 conducting this moment (or shutoff), owing to the existence of output capacitance C2, output voltage needs a period of time just can arrive 0V simultaneously; When the error current of PWM comparator is lower than (or being higher than) a certain value, the PWM comparator will be adjusted the PWM output pulse width to 100%(or 0%), metal-oxide-semiconductor Q1 conducting this moment (or shutoff) is under off state, by the size that discharges and recharges the control output current of accumulation of energy inductance L 1.
When the state comparative level end of adjusting the PWM status comparator to desired value and when being added to anti-phase (or homophase) end of PWM status comparator, be low as if the signal of electronic load Enable Pin, then triode Q3 turn-offs.The electronic load reference voltage circuit produces reference voltage as required, the reference voltage of its generation is added to the in-phase end of electronic load error amplifier by divider resistance R1, R3, the electronic load error amplifier is opened driven MOS pipe Q2 and is made electronic load device (but multi-channel parallel) draw electric current, obtains the dynamic characteristic that needs, as quick as thought with making Adjustable Output Voltage.
When current level power supply has high-frequency noise, this high-frequency noise will be by absorbing the equivalent capacity of absorption electric capacity that capacitor C 1(C1 is metal-oxide-semiconductor Q1, distributed capacitance etc.), the branch hydraulic circuit dividing potential drop of output capacitance C2, load resistance R4, be 0 at output current, during load resistance R4 resistance big (because power consumption constraints its can not be very little), even metal-oxide-semiconductor Q1 closes fully, output also has a floating voltage.Even this moment, electronic load Enable Pin signal was high, the voltage that the electronic load reference voltage generating circuit produces still can produce the in-phase end that a little signal be added to the electronic load error amplifier by the dividing potential drop of divider resistance R1, R2, and electronic load (but multi-channel parallel) is moved extremely near 0V(the floating voltage of output as long as the conducting resistance of current-limiting resistance R6 and metal-oxide-semiconductor Q2 is enough little to as a constant-current source).Simultaneously load resistance R4 also is the dead load of circuit when the circuit operate as normal, can make load resistance R4 use not even usefulness of big resistance, also can holding circuit stable.
The invention has the beneficial effects as follows in the power supply cabinet of certain volume, under the output power of power supply of certain power, can realize the very wide high voltage of high voltage/low current or high current/low voltage or the fan-out capability of high electric current respectively, the falling characteristic of while output voltage that can obtain being exceedingly fast, tunable characteristic or output current, and during operate as normal before current sampling not the certainty of measurement to output current exert an influence, power supply and external load equipment forked working, level power supply transient state overpower before can not causing.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the embodiment of the invention.
Fig. 2 is the reduction voltage circuit of the embodiment of the invention and the schematic diagram of cpu control circuit.
Fig. 3 is the theory diagram of the ordinary tap power supply of prior art.
Fig. 4 is the oscillogram of the Switching Power Supply output dynamic characteristic of prior art.
Fig. 5 is the oscillogram of the power supply output dynamic characteristic of the embodiment of the invention.
Wherein: 1-current error amplifier, 2-voltage error amplifier, 3-PWM comparator, 4-PWM status comparator, 5-electronic load error amplifier.
Embodiment
Describe the preferred embodiments of the present invention below with reference to the accompanying drawings in detail.
Embodiment such as Fig. 1, Fig. 2 and shown in Figure 3, present embodiment provides a kind of automatic range DC power supply of wide region high accuracy low noise, comprise prime Switching Power Supply, cpu control circuit and reduction voltage circuit, described Switching Power Supply adopts the ordinary tap power supply, perhaps also can adopt conventional linear power supply, ordinary tap power supply rated power is 1200W; Described cpu control circuit comprises electronic load reference voltage circuit, divider resistance R1, R2, R3, triode Q3, PWM status comparator 4, state comparative level end, electronic load enable signal end, current error amplifier 1 and voltage error amplifier 2; Described reduction voltage circuit comprises metal-oxide-semiconductor Q1, diode D1, accumulation of energy inductance L 1, load resistance R4, current sampling resistor R5, capacitor C 3, output capacitance C2, absorbs capacitor C 1, drive circuit, pwm circuit and electronic load.
The drain electrode of metal-oxide-semiconductor Q1 is connected with the output cathode of preceding level power supply, one end of an output of source electrode and drive circuit, the negative pole of diode D1 and accumulation of energy inductance L 1 is connected, the other end of grid and drive circuit is connected, and cross-over connection has the capacitor C 1 of absorption on the drain electrode of metal-oxide-semiconductor Q1 and the source electrode.
The positive pole of the end of the other end of accumulation of energy inductance L 1 and load resistance R4, an end of capacitor C 3 and output capacitance C2 is connected, and is used for the output cathode as the automatic range power supply.
Output negative pole and the positive pole of diode D1, the other end of load resistance R4, the other end of capacitor C 3 and the end of current sampling resistor R5 of preceding level power supply are connected.
The other end of current sampling resistor R5 is connected with the negative pole of output capacitance C2, is used for the output negative pole as the automatic range power supply.
The input of the current error amplifier 1 in the cpu control circuit is connected in parallel on the two ends of current sampling resistor R5, after gathering the input of current signal by current error amplifier 1 output input pwm circuit, outputed to the input of drive circuit again by the output of pwm circuit, by the break-make of drive circuit output signal control metal-oxide-semiconductor Q1;
The input of the voltage error amplifier 2 in the cpu control circuit is connected in parallel on the two ends of output capacitance C2, after collecting the input of voltage signal by the output input pwm circuit of voltage error amplifier 2, outputed to the input of drive circuit again by the output of pwm circuit, by the break-make of drive circuit output signal control metal-oxide-semiconductor Q1;
The input of the PWM comparator 3 of the output of the output of current error amplifier 1, the big device in voltage error side and pwm circuit links to each other.
Electronic load comprises metal-oxide-semiconductor Q2, electronic load error amplifier 5 and current-limiting resistance R6, the drain electrode of metal-oxide-semiconductor Q2 is connected with the positive pole of output capacitance C2, grid is connected with the output of electronic load error amplifier 5, the end of source electrode and current-limiting resistance R6 is connected with the negative terminal of electronic load operational amplifier, the other end of current-limiting resistance R6 is connected with the negative pole of preceding level power supply, perhaps also a plurality of electronic loads in parallel simultaneously;
The output of the PWM status comparator 4 in the cpu control circuit is connected with the base stage of triode Q3, the base stage of triode Q3 is provided with electronic load enable signal end, the emitter of triode Q3 is connected with the negative pole of automatic range power supply, the collector electrode of the triode Q3 divider resistance R2 that is connected in series successively, behind the R3, positive input terminal with electronic load error amplifier 5 is connected again, the end of divider resistance R1 is connected divider resistance R2, between the R3, the other end is connected with the electronic load reference voltage circuit, an input of PWM status comparator 4 is set to state comparative level end, another input is connected with the output of current error amplifier 1 and voltage error amplifier 2, be connected by the positive input terminal of cpu control circuit with electronic load error amplifier 5, the break-make that is used for control metal-oxide-semiconductor Q2 plays the function of current of drawing of electronic load, realize different power supply output dynamic characteristics, from the traditional slow output waveform figure of Fig. 4 as can be seen, the output waveform of present embodiment Fig. 5 can realize that the quick output of waveform changes.
The beneficial effect of present embodiment is in the power supply cabinet of 1U height, under the output power of power supply of 1200W, can realize the fan-out capability of 80V high voltage/low current or the high current/low voltage of 60A respectively, be equivalent to possess an output services scope that possesses the conventional power supply of 80V/60A simultaneously, simultaneously can also obtain being exceedingly fast, the output voltage of tunable characteristic and the falling characteristic of output current, and during operate as normal before current sampling not the certainty of measurement to output current exert an influence, power supply and external load equipment forked working, level power supply transient state overpower before can not causing.
Claims (4)
1. the automatic range DC power supply of a wide region high accuracy low noise, level power supply and cpu control circuit before comprising, it is characterized in that: also comprise reduction voltage circuit and at least one electronic load, described reduction voltage circuit comprises metal-oxide-semiconductor Q1, diode D1, accumulation of energy inductance L 1, load resistance R4, current sampling resistor R5, capacitor C 3, output capacitance C2, drive circuit, pwm circuit;
The drain electrode of metal-oxide-semiconductor Q1 is connected with the output cathode of preceding level power supply, and an end of an output of source electrode and drive circuit, the negative pole of diode D1 and accumulation of energy inductance L 1 is connected, and the other end of grid and drive circuit is connected;
The positive pole of the end of the other end of accumulation of energy inductance L 1 and load resistance R4, an end of capacitor C 3 and output capacitance C2 is connected, and is used for the output cathode as the automatic range power supply;
Output negative pole and the positive pole of diode D1, the other end of load resistance R4, the other end of capacitor C 3 and the end of current sampling resistor R5 of preceding level power supply are connected;
The other end of current sampling resistor R5 is connected with the negative pole of output capacitance C2, is used for the output negative pole as the automatic range power supply;
The input of pwm circuit receives voltage or the electric current comparison signal of cpu control circuit and exports pwm pulse to the input of drive circuit, is connected source electrode and the grid of metal-oxide-semiconductor Q1 more respectively by the output of drive circuit, the break-make of control metal-oxide-semiconductor Q1;
Electronic load comprises metal-oxide-semiconductor Q2, electronic load error amplifier (5) and current-limiting resistance R6;
The drain electrode of metal-oxide-semiconductor Q2 is connected with the positive pole of output capacitance C2, grid is connected with the output of electronic load error amplifier (5), the end of source electrode and current-limiting resistance R6 is connected with the negative terminal of electronic load operational amplifier, and the other end of current-limiting resistance R6 is connected with the negative pole of preceding level power supply;
Cpu control circuit is connected with the positive input terminal of electronic load error amplifier (5), is used for the break-make of control metal-oxide-semiconductor Q2;
Described cpu control circuit comprises current error amplifier (1), voltage error amplifier (2), electronic load reference voltage circuit, divider resistance R1, R2, R3, triode Q3, PWM status comparator (4), state comparative level end and electronic load enable signal end;
The output of PWM status comparator (4) is connected with the base stage of triode Q3, the base stage of triode Q3 is provided with electronic load enable signal end, the emitter of triode Q3 is connected with the negative pole of automatic range power supply, the collector electrode of the triode Q3 divider resistance R2 that is connected in series successively, be connected with the positive input terminal of electronic load error amplifier (5) again behind the R3, the end of divider resistance R1 is connected divider resistance R2, between the R3, the other end is connected with the electronic load reference voltage circuit, an input of PWM status comparator (4) is set to state comparative level end, and another input is connected with the output of current error amplifier (1) and voltage error amplifier (2);
The input of current error amplifier (1) is connected in parallel on the two ends of current sampling resistor R5, after gathering the input of current signal by current error amplifier (1) output input pwm circuit, outputed to the input of drive circuit again by the output of pwm circuit, by the break-make of drive circuit output signal control metal-oxide-semiconductor Q1;
The input of voltage error amplifier (2) is connected in parallel on the two ends of output capacitance C2, after collecting the input of voltage signal by the output input pwm circuit of voltage error amplifier (2), outputed to the input of drive circuit again by the output of pwm circuit, by the break-make of drive circuit output signal control metal-oxide-semiconductor Q1;
The input of the output of current error amplifier (1), the output of the big device in voltage error side and pwm circuit links to each other.
2. the automatic range DC power supply of a kind of wide region high accuracy low noise according to claim 1, it is characterized in that: pwm circuit comprises PWM comparator (3), the input of PWM comparator (3) is the input of pwm circuit.
3. the automatic range DC power supply of a kind of wide region high accuracy low noise according to claim 1 and 2 is characterized in that: cross-over connection has the capacitor C 1 of absorption on the drain electrode of metal-oxide-semiconductor Q1 and the source electrode.
4. the automatic range DC power supply of a kind of wide region high accuracy low noise according to claim 3, it is characterized in that: preceding level power supply is ordinary tap power supply or conventional linear power supply.
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| CN102195480B true CN102195480B (en) | 2013-09-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834539A (en) * | 2010-05-27 | 2010-09-15 | 浙江大学 | High-efficiency AC/DC combined converter with wide output voltage range |
| CN201994849U (en) * | 2011-03-07 | 2011-09-28 | 艾德克斯电子（南京）有限公司 | Auto range direct-current power supply with wide range, high accuracy and low noise |
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| JP3742780B2 (en) * | 2002-05-09 | 2006-02-08 | 松下電器産業株式会社 | DC-DC converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834539A (en) * | 2010-05-27 | 2010-09-15 | 浙江大学 | High-efficiency AC/DC combined converter with wide output voltage range |
| CN201994849U (en) * | 2011-03-07 | 2011-09-28 | 艾德克斯电子（南京）有限公司 | Auto range direct-current power supply with wide range, high accuracy and low noise |
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Address after: Zhimengyuan, No.4 gupinggang, Gulou District, Nanjing, Jiangsu Province, 210009 Patentee after: ADEX Electronics (Nanjing) Co.,Ltd. Address before: Building 1, No. 108, xishanqiao South Road, Yuhuatai District, Nanjing City, Jiangsu Province, 210039 Patentee before: ADEX Electronics (Nanjing) Co.,Ltd. |