CN201975995U - Circuit capable of enlarging output range and improving output characteristic of switching power supply - Google Patents
Circuit capable of enlarging output range and improving output characteristic of switching power supply Download PDFInfo
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- CN201975995U CN201975995U CN2011200561116U CN201120056111U CN201975995U CN 201975995 U CN201975995 U CN 201975995U CN 2011200561116 U CN2011200561116 U CN 2011200561116U CN 201120056111 U CN201120056111 U CN 201120056111U CN 201975995 U CN201975995 U CN 201975995U
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Abstract
The utility model provides a circuit capable of enlarging the output range and improving the output characteristic of a switching power supply, which comprises a CPU (Central Processing Unit) circuit for providing comparing signals, controlling signals and setting signals, and a voltage-reducing circuit, wherein the voltage-reducing circuit is connected with the output end positive electrode and the output end negative electrode of a pre-stage power supply, and comprises an MOS (Metal Oxide Semiconductor) 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 PWM (Pulse-Width Modulation) circuit. In the utility model, as one circuit can be additionally arranged, very wide high voltage or high current output range capacity of high voltage/low current or high current/low voltage is realized in a power supply case with certain size under the condition of certain power supply output power, and simultaneously, the very quick and adjustable reduction characteristic of output voltage and output current can be obtained.
Description
Technical field
The utility model relates to a kind of Switching Power Supply control technology field, particularly a kind of circuit that can enlarge the Switching Power Supply output area and improve output characteristic.
Background technology
In electronic leaning laboratory, owing to need be used to test multiple different product, the power supply of selecting for use usually needs 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, promptly 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, the raising and the wasting of resources of purchasing the power supply cost have been caused, the frequent simultaneously inconvenience of changing the power operation ten minutes.
Summary of the invention
The purpose of this utility model provides a kind of circuit, solve existing power supply output and can in certain power bracket, obtain the broad high voltage/low current or the output services scope of low-voltage/high electric current, and realize faster, the output voltage of tunable characteristic and the falling characteristic of output current.
To achieve these goals, the utility model provides a kind of circuit that can enlarge the Switching Power Supply output area and improve output characteristic, comprise cpu control circuit, comparison, control and setting signal are provided, also comprise reduction voltage circuit, the output head anode and the negative pole of output end of level power supply before described reduction voltage circuit is connected, 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 head anode 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 one end of the other end of accumulation of energy inductance L 1 and load resistance, 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 the voltage or the electric current comparison signal of cpu control circuit and exports the input of pwm pulse to 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.
Also comprise at least one electronic load, described electronic load comprises 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, one end of source electrode and current-limiting resistance 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;
The reference voltage that cpu control circuit produces is input to the positive input terminal of electronic load error amplifier, is used to control the break-make of 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, be connected with the positive input terminal of electronic load error amplifier 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 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, gather current signal after behind the input of current error amplifier out input pwm circuit, output 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, collect voltage signal after behind the input of the output input pwm circuit of voltage error amplifier, output 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, the output of voltage error amplifier and pwm circuit links to each other.
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.
Operation principle of the present utility model is to have connected the one-level reduction voltage circuit on the signal output part of ordinary tap power supply or conventional linear power supply, the break-make by control metal-oxide-semiconductor Q1 and utilize accumulation of energy inductance L control output to realize high voltage/low current or high current/low voltage.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 (but multi-channel parallel) draw electric current, obtains the dynamic characteristic that needs, as quick as thought with making Adjustable Output Voltage.
When the output of 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 R1, R2, and electronic load device (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 beneficial effects of the utility model are by installing a circuit additional, be implemented 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 output area ability of high electric current respectively, the falling characteristic of while output voltage that can obtain being exceedingly fast, tunable characteristic and output current, and when 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 utility model embodiment.
Fig. 2 is the circuit diagram of the utility model embodiment.
Fig. 3 is the oscillogram of the Switching Power Supply output dynamic characteristic of prior art.
Fig. 4 is the oscillogram of the power supply output dynamic characteristic of the utility model embodiment.
Wherein: 1-current error amplifier, 2-voltage error amplifier, 3-PWM comparator, 4-PWM status comparator, 5-electronic load error amplifier.
Embodiment
Describe preferred embodiment of the present utility model below with reference to the accompanying drawings in detail.
Embodiment as depicted in figs. 1 and 2, present embodiment provides a kind of circuit that can enlarge the Switching Power Supply output area and improve output characteristic, comprise cpu control circuit and reduction voltage circuit, 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 current error amplifier 1 is connected in parallel on the two ends of current sampling resistor R5, gather current signal after behind the input of current error amplifier 1 output input pwm circuit, output 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, collect voltage signal after behind the input of the output input pwm circuit of voltage error amplifier 2, output 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, voltage error amplifier 2 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 can electronic load is in parallel a plurality of 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 to control metal-oxide-semiconductor Q2 plays the function of current of drawing of electronic load, realize the output dynamic characteristic of different voltage and currents, from the traditional slow output waveform figure of Fig. 3 as can be seen, the output waveform of present embodiment Fig. 4 can realize that the quick output of waveform changes.
The beneficial effect of present embodiment is the output services scope that high voltage/low current or high current/low voltage can be provided, the falling characteristic of while output voltage that can also obtain being exceedingly fast, tunable characteristic and output current, and when operate as normal before current sampling not the certainty of measurement to output current exert an influence, circuit and external load equipment forked working can not cause the transient state overpower of prime power output end.
Claims (5)
1. one kind can enlarge Switching Power Supply output area and the circuit that improves output characteristic, comprise cpu control circuit, comparison, control and setting signal are provided, it is characterized in that: also comprise reduction voltage circuit, the output head anode and the negative pole of output end of level power supply before described reduction voltage circuit is connected, reduction voltage circuit comprises metal-oxide-semiconductor (Q1), diode (D1), accumulation of energy inductance (L1), load resistance (R4), current sampling resistor (R5), electric capacity (C3), output capacitance (C2), drive circuit, pwm circuit;
The drain electrode of metal-oxide-semiconductor Q1 is connected with the output head anode 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 (L1) is connected, and the other end of grid and drive circuit is connected;
The positive pole of one end of the other end of accumulation of energy inductance (L1) and load resistance (R4), an end of electric capacity (C3) 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 electric capacity (C3) and an 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 the voltage or the electric current comparison signal of cpu control circuit and exports the input of pwm pulse to drive circuit, is connected the 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).
2. a kind of circuit that can enlarge the Switching Power Supply output area and improve output characteristic according to claim 1, it is characterized in that: also comprise at least one electronic load, described 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), one end of source electrode and current-limiting resistance (R6) and the negative terminal of electronic load operational amplifier are connected, and the other end of current-limiting resistance (R6) and the negative pole of preceding level power supply are connected;
The reference voltage that cpu control circuit produces is input to the positive input terminal of electronic load error amplifier (5), is used to control the break-make of metal-oxide-semiconductor (Q2).
3. a kind of circuit that can enlarge the Switching Power Supply output area and improve output characteristic according to claim 2, it is characterized in that: 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 triode (Q3) divider resistance (R2 that is connected in series successively, R3) be connected with the positive input terminal of electronic load error amplifier (5) again after, one end of divider resistance (R1) is connected divider resistance (R2, R3) between, 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), gather current signal after behind the input of current error amplifier (1) output input pwm circuit, output 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), collect voltage signal after behind the input of the output input pwm circuit of voltage error amplifier (2), output 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 (1), voltage error amplifier (2) and the input of pwm circuit link to each other.
4. a kind of circuit that can enlarge the Switching Power Supply output area and improve output characteristic according to claim 3, it is characterized in that: pwm circuit comprises PWM comparator (3), the input of PWM comparator (3) is the input of pwm circuit.
5. according to claim 1 or 2 or 3 or 4 described a kind of circuit that can enlarge the Switching Power Supply output area and improve output characteristic, it is characterized in that: cross-over connection has absorption electric capacity (C1) on the drain electrode of metal-oxide-semiconductor (Q1) and the source electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200561116U CN201975995U (en) | 2011-03-07 | 2011-03-07 | Circuit capable of enlarging output range and improving output characteristic of switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011200561116U CN201975995U (en) | 2011-03-07 | 2011-03-07 | Circuit capable of enlarging output range and improving output characteristic of switching power supply |
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| CN201975995U true CN201975995U (en) | 2011-09-14 |
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| CN2011200561116U Expired - Lifetime CN201975995U (en) | 2011-03-07 | 2011-03-07 | Circuit capable of enlarging output range and improving output characteristic of switching power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158086A (en) * | 2011-03-07 | 2011-08-17 | 艾德克斯电子（南京）有限公司 | Circuit capable of expanding switching power supply output range and improving output characteristic |
| CN103973114A (en) * | 2014-05-06 | 2014-08-06 | 中国电子科技集团公司第四十一研究所 | Constant power control direct-current power supply |
| CN104333230A (en) * | 2014-11-13 | 2015-02-04 | 江苏兆伏爱索新能源有限公司 | Boost circuit of photovoltaic inverter |
-
2011
- 2011-03-07 CN CN2011200561116U patent/CN201975995U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158086A (en) * | 2011-03-07 | 2011-08-17 | 艾德克斯电子（南京）有限公司 | Circuit capable of expanding switching power supply output range and improving output characteristic |
| CN102158086B (en) * | 2011-03-07 | 2013-09-25 | 艾德克斯电子（南京）有限公司 | Circuit capable of expanding switching power supply output range and improving output characteristic |
| CN103973114A (en) * | 2014-05-06 | 2014-08-06 | 中国电子科技集团公司第四十一研究所 | Constant power control direct-current power supply |
| CN104333230A (en) * | 2014-11-13 | 2015-02-04 | 江苏兆伏爱索新能源有限公司 | Boost circuit of photovoltaic inverter |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20110914 Effective date of abandoning: 20130925 |
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| RGAV | Abandon patent right to avoid regrant |