CN203287806U - Mixed type regulated power supply - Google Patents

Mixed type regulated power supply Download PDF

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CN203287806U
CN203287806U CN2013200370368U CN201320037036U CN203287806U CN 203287806 U CN203287806 U CN 203287806U CN 2013200370368 U CN2013200370368 U CN 2013200370368U CN 201320037036 U CN201320037036 U CN 201320037036U CN 203287806 U CN203287806 U CN 203287806U
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voltage
power supply
linear
resistance
output
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李如春
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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Abstract

A mixed type regulated power supply is formed through parallel connection of a linear regulated power supply module and a switching power supply module. The linear regulated power supply module is composed of an operational amplifier U2, a PNP type triode Q1, an NPN type triode Q2, a voltage-regulator diode D3, a resistor R3 and a resistor R4, wherein the voltage-regulator diode D3 provides reference voltage for a linear power supply, the triode Q1 and the triode Q2 improve the output current drive capability of the linear regulated power supply module, and a circuit controls output voltage through control over the value of a slide rheostat R4. A linear regulated power supply is in parallel connection with a switching power supply to realize mixed voltage stabilization. The output voltage is decided by the linear voltage stabilization part, and the output waveform of the output voltage is small in wave and wide in frequency band. The output current is mostly provided by the switching power supply, so that power-supply efficiency is improved. The mixed type regulated power supply integrates the advantages of the linear power supply and the advantages of the switching power supply, and the performance of the mixed type regulated power supply is improved.

Description

The mixed type stabilized voltage supply
Technical field
The utility model relates to the design of mixed type stabilized voltage supply, can be widely used in long-range and the field such as data communication, computing machine, business automation equipment, industrial instruments, military affairs, space flight, relates to all trades and professions of national economy.
Background technology
Stabilized voltage supply commonly used mainly contains two kinds of linear stabilized power supply and switching power supplies.Linear stabilized power supply is done in linear amplification region owing to adjusting the plumber, and when load current was larger, the collector dissipation of adjusting pipe was larger, and power-efficient is lower, generally only has 40%-60%, sometimes also need be equipped with huge heat abstractor.But the output waveform of linear stabilized power supply has advantages of that degree of distortion is low, dynamic response fast and bandwidth.In switching power supply, adjust pipe and be operated on off state, because saturation conduction pressure drop and the cut-off current of pipe are all very little, so the pipe consumption mainly occurs in the process of state conversion, power-efficient can be brought up to 75%-95%.Simultaneously, due to the heat abstractor that has omitted power transformer and adjustment pipe, so with respect to linear stabilized power supply, the switching power supply volume is little, lightweight.But the output waveform voltage ripple of Switching Power Supply is large, has voltage distortion and time delay, and circuit design more complicated, components and parts are had relatively high expectations.
In actual applications, how designing and realize more high power density, more high conversion efficiency, more low-cost, more high performance stabilized voltage supply, is the target that the Power Electronic Technique slip-stick artist pursues all the time.Usually, adopt the Switching Power Supply of recommending the transform topological structure, can improve output power, be suitable for the low-voltage, high-current occasion.Current mode technology and slope compensation technology that peak point current is controlled are also the parts of emerging power technology, and it can improve the stability of transient response speed and the system loop of Switching Power Supply effectively.The topological structure that Switching Power Supply is mixed with linear power supply is also improve the power supply output efficiency and improve one of important method of performance.
Summary of the invention
The utility model will overcome the above-mentioned shortcoming of prior art, provide a kind of comprehensive linear power supply and Switching Power Supply advantage, avoid the inefficient of linear power supply and improve the mixed type stabilized voltage supply of voltage ripple, distortion and the time delay of Switching Power Supply.
Mixed type stabilized voltage supply described in the utility model is characterized in that: by linear stabilized power supply module and switch power module, be formed in parallel; Described linear stabilized power supply module is by operational amplifier U 2, positive-negative-positive triode Q 1With NPN type triode Q 2, voltage stabilizing diode D 3, resistance R 3And R 4Form; Wherein, D 3Provide the reference voltage of linear power supply, triode Q 1And Q 2Improve the output current driving force of Voltage stabilizing module, circuit is by controlling slide rheostat R 4Value control the size of output voltage;
Described switch power module is by comprising operational amplifier U 3, external resistance R 6And R 10Voltage comparator CMP 1, reference power source V is provided refVoltage stabilizing diode D 1, limiting resistance R lim(resistance R 5), field effect transistor M 1, sustained diode 4And inductance L 1Form;
Specifically being connected to of described switch power module circuit: at first, resistance R 6Concatenation operation amplifier U 3In-phase end, operational amplifier U 3Output through resistance R 10Feed back to amplifier U 3The in-phase end input end, form hysteresis voltage comparator CMP 1Through rectification, filtered pulsating direct current input voltage V IDivide two-way, a road is first to pass through negative terminal, then the mode of process anode is through voltage stabilizing diode D 1With comparator C MP 1The R of in-phase end 6Resistance is connected, and field effect transistor M is linked respectively on a road 1Drain electrode and limiting resistance R limAn end, R limThe other end and comparator C MP 1End of oppisite phase be connected, simultaneously with the linear stabilized power supply module in Q 2Collector connect; Comparator C MP 1Output terminal and field effect transistor M 1Grid be connected, field effect transistor M 1Source electrode respectively with sustained diode 4Negative terminal and inductance L 1An end be connected, D 4Positive ending grounding, inductance L 1The other end and the output-parallel of linear voltage stabilization module after with pull-up resistor R LBe connected;
The circuit of linear stabilized power supply module specifically is connected to: filtered pulsating direct current input voltage V IThrough a current-limiting resistance, with stabilivolt D 3Negative terminal be attempted by operational amplifier U 2In-phase end, stabilivolt D 3Positive ending grounding.Resistance R 3One termination amplifier U 2End of oppisite phase, other end ground connection; Amplifier U 2Output through resistance R 4Feed back to amplifier U 2Inverting input; Triode Q 1And Q 2Base stage and connect after and amplifier U 2Output terminal be connected, emitter also connects rear output as the linear voltage stabilization module, triode Q 2Grounded collector.
As preferred a kind of scheme: comparator C MP 1Reference power source by voltage stabilizing diode D 1With adjustable resistance R 2Compose in parallel, by regulating R 2Size control the reference voltage V of place in circuit refAnd, reference power source V refThrough voltage follower U 1Buffer compartment from after be connected to comparator C MP 1In-phase end; In addition, field effect transistor M 1Drain electrode and source electrode between and meet a protection diode D 3, when input short, be inductance L 1One discharge paths is provided, prevents M 1Drain-source breakdown.
Technical conceive of the present utility model is: during work, by changing limiting resistance R limOn pressure drop, to adjust input comparator CMP 1The magnitude of voltage of end of oppisite phase, make itself and thresholding reference voltage V TComparing, is high level or low level with the output of determining comparer.Output current i when the linear voltage stabilization module section regDuring increase, R limOn pressure drop will be along with increase, input comparator CMP 1The voltage of end of oppisite phase reduces, if lower than the thresholding reference voltage V that sets T-The time, comparer is exported high level, field effect transistor M 1Conducting, inductance L 1Be recharged the output current i of Switching Power Supply part LIncrease.Due to output total current I outA constant numerical value, linear power supply this moment current i partly regProgressively descend, R limOn also corresponding reducing of pressure drop, cause comparator C MP 1The input voltage of end of oppisite phase increases, when surpassing the threshold voltage V that sets T+The time, comparer output low level, M 1Cut-off, diode D 4For inductance L 1Provide the afterflow passage, inductive current i LStart to descend, simultaneously the output current i of linear power supply regProgressively rise.So go round and begin again, keep the constant of output voltage.
In the above-mentioned course of work, linear stabilized power supply guarantees the constant of output voltage, voltage comparator CMP 1Control field effect transistor M 1Switch, and the frequency of operation of definite Switching Power Supply.Output current I outThe electric current of the overwhelming majority provided by Switching Power Supply, improved conversion efficiency.The output current of linear power supply has a threshold value I γ, by the voltage V of reference power source ref, limiting resistance R limAnd the feedback resistance R of hysteresis comparator 6And R 10Determine.Output i when linear power supply regSurpass I γThe time, M 1Conducting, restriction i regContinuing increases; Work as i regWhile being reduced to a certain degree, M 1Cut-off, stop i regFurther reduce, thereby guarantee output current I outIt is a steady state value.
The beneficial effects of the utility model are mainly manifested in:, with linear stabilized power supply and switch power parallel, realize mixed stable voltage.Output voltage partly determines by linear voltage stabilization, and the output waveform ripple is little, bandwidth; The output current major part is provided by Switching Power Supply, has improved power-efficient.This power supply combines the advantage separately of linear power supply and Switching Power Supply, has improved power source performance.
Description of drawings
Fig. 1 mixed type voltage-stabilized power supply circuit schematic diagram
Fig. 2 mixed type stabilized voltage supply output voltage work wave
Fig. 3 comparator C MP 1Output terminal (passage 1) and D 4The voltage waveform at two ends (passage 2)
The current waveform of Fig. 4 circuit each several part
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
Mixed type stabilized voltage supply described in the utility model is characterized in that: by linear stabilized power supply module and switch power module, be formed in parallel; Described linear stabilized power supply module is by operational amplifier U 2, positive-negative-positive triode Q 1With NPN type triode Q 2, voltage stabilizing diode D 3, resistance R 3And R 4Form; Wherein, D 3Provide the reference voltage of linear power supply, triode Q 1And Q 2Improve the output current driving force of Voltage stabilizing module, circuit is by controlling slide rheostat R 4Value control the size of output voltage;
Described switch power module is by comprising operational amplifier U 3, external resistance R 6And R 10Voltage comparator CMP 1, reference power source V is provided refVoltage stabilizing diode D 1, limiting resistance R lim(resistance R 5), field effect transistor M 1, sustained diode 4And inductance L 1Form;
Specifically being connected to of described switch power module circuit: at first, resistance R 6Concatenation operation amplifier U 3In-phase end, operational amplifier U 3Output through resistance R 10Feed back to amplifier U 3The in-phase end input end, form hysteresis voltage comparator CMP 1Through rectification, filtered pulsating direct current input voltage V IDivide two-way, a road is first to pass through negative terminal, then the mode of process anode is through voltage stabilizing diode D 1With comparator C MP 1The R of in-phase end 6Resistance is connected, and field effect transistor M is linked respectively on a road 1Drain electrode and limiting resistance R limAn end, R limThe other end and comparator C MP 1End of oppisite phase be connected, simultaneously with the linear stabilized power supply module in Q 2Collector connect; Comparator C MP 1Output terminal and field effect transistor M 1Grid be connected, field effect transistor M 1Source electrode respectively with sustained diode 4Negative terminal and inductance L 1An end be connected, D 4Positive ending grounding, inductance L 1The other end and the output-parallel of linear voltage stabilization module after with pull-up resistor R LBe connected;
The circuit of linear stabilized power supply module specifically is connected to: filtered pulsating direct current input voltage V IThrough a current-limiting resistance, with stabilivolt D 3Negative terminal be attempted by operational amplifier U 2In-phase end, stabilivolt D 3Positive ending grounding.Resistance R 3One termination amplifier U 2End of oppisite phase, other end ground connection; Amplifier U 2Output through resistance R 4Feed back to amplifier U 2Inverting input; Triode Q 1And Q 2Base stage and connect after and amplifier U 2Output terminal be connected, emitter also connects rear output as the linear voltage stabilization module, triode Q 2Grounded collector.
As preferred a kind of scheme: comparator C MP 1Reference power source by voltage stabilizing diode D 1With adjustable resistance R 2Compose in parallel, by regulating R 2Size control the reference voltage V of place in circuit refAnd, reference power source V refThrough voltage follower U 1Buffer compartment from after be connected to comparator C MP 1In-phase end; In addition, field effect transistor M 1Drain electrode and source electrode between and meet a protection diode D 3, when input short, be inductance L 1One discharge paths is provided, prevents M 1Drain-source breakdown.
Fig. 1 is circuit theory diagrams of the present utility model, and the linear stabilized power supply module is by operational amplifier TL081, triode Q 1(BD140) and Q 2(BD139), voltage stabilizing diode D 3, resistance R 3, R 4And R 5Form.Wherein, R 5Limiting resistance R lim, D 3Provide the reference voltage of linear power supply, by controlling slide rheostat R 4Value control the size of output voltage.Voltage stabilizing diode D 1, adjustable potentiometer R 2, voltage follower U 1(uA741), hysteresis comparator CMP 1(comprise operational amplifier LM311, resistance R 6And R 10), field effect transistor M 1(IRF540), inductance L 1And sustained diode 4Form the Switching Power Supply part.Voltage follower U 1Play a part buffer compartment from.Stabilivolt D 1With potentiometer R 2Determine comparator C MP 1The value of reference voltage, by with limiting resistance R limThe voltage of upper generation compares, and determines that the output of comparer is high level or low level.When linear power supply part output current increases, R limOn pressure drop will be along with increase, input comparator CMP 1The voltage of end of oppisite phase reduces, if lower than the thresholding reference voltage V that sets T-The time, comparer is exported high level, M 1Conducting, inductance L 1Be recharged, Switching Power Supply part output current increases.Because the output total current is a constant numerical value, this moment, the electric current of linear switch part progressively descended, R limOn also corresponding reducing of pressure drop, make comparator C MP when being reduced to 1The input voltage of end of oppisite phase surpasses the threshold voltage V that sets T+The time, comparer is output low level, M 1Cut-off, D 4For inductance L 1The afterflow passage is provided, and inductive current starts to descend, and the linear power supply output current progressively rises.So go round and begin again, keep the constant of output voltage.
In Fig. 1, adding amplitude is the DC voltage of 18V, and is superimposed with the interference square-wave signal of 1V, a 10KHz, the pulsation of analog input signal, slide rheostat R 2And R 4All get the waveform that 50%, Fig. 2 has shown output voltage.Can see, the waveform of output voltage is comparatively desirable, and amplitude is 6.67V, with the theoretical calculation formula of linear power supply module output voltage
Figure BDA00002764217300061
The value that draws is consistent.Fig. 3 has shown comparator C MP 1Output terminal and sustained diode 4The voltage waveform at two ends.Analyze theoretically, be on off state during the comparer normal operation, its output waveform should be a square wave.As we can see from the figure, the actual output of comparer is consistent with theory.Thereby illustrate, switch power module is working properly.Fig. 4 has shown the waveform of circuit each several part electric current, and wherein passage 1 is the output current of linear power supply part, and passage 2 is the current waveform of switch sections, and passage 3 is the output total current waveform, and wherein the electric current and voltage of current probe is than being 10mV/mA.As we can see from the figure, the electric current of switch module is about 550 ± 50mA, and the electric current of linear block is about
Figure BDA00002764217300071
Obviously, switch module provides most output currents, and output current keeps a fixed value (being about 660mA) simultaneously.This explanation, most power of circuit are realized by switch module, improved the efficiency of circuit, and the Main Function of linear block are the ripples that reduces output voltage, improve the performance of circuit.
The described content of this instructions embodiment is only enumerating the way of realization of utility model design; protection domain of the present utility model should not be regarded as only limiting to the concrete form that embodiment states, protection domain of the present utility model also reaches the equivalent technologies means that design can be expected according to the utility model in those skilled in the art.

Claims (2)

1. the mixed type stabilized voltage supply, is characterized in that: by linear stabilized power supply module and switch power module, be formed in parallel; Described linear stabilized power supply module is by operational amplifier U 2, positive-negative-positive triode Q 1With NPN type triode Q 2, voltage stabilizing diode D 3, resistance R 3And resistance R 4Form; Wherein, D 3Provide the reference voltage of linear power supply, triode Q 1With triode Q 2Improve the output current driving force of Voltage stabilizing module, circuit is by controlling slide rheostat R 4Value control the size of output voltage;
Described switch power module is by comprising operational amplifier U 3, external resistance R 6And resistance R 10Voltage comparator CMP 1, reference power source V is provided refVoltage stabilizing diode D 1, limiting resistance R lim, field effect transistor M 1, sustained diode 4And inductance L 1Form;
Specifically being connected to of described switch power module circuit: at first, resistance R 6Concatenation operation amplifier U 3In-phase end, operational amplifier U 3Output through resistance R 10Feed back to amplifier U 3The in-phase end input end, form hysteresis voltage comparator CMP 1Through rectification, filtered pulsating direct current input voltage V IDivide two-way, a road is first to pass through negative terminal, then the mode of process anode is through voltage stabilizing diode D 1With comparator C MP 1The R of in-phase end 6Resistance is connected, and field effect transistor M is linked respectively on a road 1Drain electrode and limiting resistance R limAn end, R limThe other end and comparator C MP 1End of oppisite phase be connected, simultaneously with the linear stabilized power supply module in Q 2Collector connect; Comparator C MP 1Output terminal and field effect transistor M 1Grid be connected, field effect transistor M 1Source electrode respectively with sustained diode 4Negative terminal and inductance L 1An end be connected, D 4Positive ending grounding, inductance L 1The other end and the output-parallel of linear voltage stabilization module after with pull-up resistor R LBe connected;
The circuit of linear stabilized power supply module specifically is connected to: filtered pulsating direct current input voltage V IThrough a current-limiting resistance, with stabilivolt D 3Negative terminal be attempted by operational amplifier U 2In-phase end, stabilivolt D 3Positive ending grounding; Resistance R 3One termination amplifier U 2End of oppisite phase, other end ground connection; Amplifier U 2Output through resistance R 4Feed back to amplifier U 2Inverting input; Triode Q 1With triode Q 2Base stage and connect after and amplifier U 2Output terminal be connected, emitter also connects rear output as the linear voltage stabilization module, triode Q 2Grounded collector.
2. stabilized voltage supply as claimed in claim 1, is characterized in that: comparator C MP 1Reference power source by voltage stabilizing diode D 1With adjustable resistance R 2Compose in parallel, by regulating R 2Size control the reference voltage V of place in circuit refAnd, reference power source V refThrough voltage follower U 1Buffer compartment from after be connected to comparator C MP 1In-phase end; In addition, field effect transistor M 1Drain electrode and source electrode between and meet a protection diode D 3, when input short, be inductance L 1One discharge paths is provided, prevents M 1Drain-source breakdown.
CN2013200370368U 2013-01-23 2013-01-23 Mixed type regulated power supply Expired - Fee Related CN203287806U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103123511A (en) * 2013-01-23 2013-05-29 浙江工业大学 Hybrid type voltage-stabilized power supply
CN103945608A (en) * 2014-04-15 2014-07-23 广东科谷电源有限公司 Low power consumed LED linear power supply with following characteristic
CN104793683A (en) * 2015-04-20 2015-07-22 樊晓微 Mixed stabilized voltage supply
CN105353816A (en) * 2014-08-20 2016-02-24 联想(北京)有限公司 Method for stabilizing power supply, power supply and electronic device
CN106292825A (en) * 2016-09-10 2017-01-04 杭州电子科技大学 A kind of precision current source control circuit being suitable to grounding type resistance dependent sensor
CN113224948A (en) * 2021-07-08 2021-08-06 上海芯龙半导体技术股份有限公司 Switching power supply circuit, switching power supply chip and switching power supply system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103123511A (en) * 2013-01-23 2013-05-29 浙江工业大学 Hybrid type voltage-stabilized power supply
CN103123511B (en) * 2013-01-23 2014-11-12 浙江工业大学 Hybrid type voltage-stabilized power supply
CN103945608A (en) * 2014-04-15 2014-07-23 广东科谷电源有限公司 Low power consumed LED linear power supply with following characteristic
CN105353816A (en) * 2014-08-20 2016-02-24 联想(北京)有限公司 Method for stabilizing power supply, power supply and electronic device
CN104793683A (en) * 2015-04-20 2015-07-22 樊晓微 Mixed stabilized voltage supply
CN104793683B (en) * 2015-04-20 2016-09-14 樊晓微 Mixed stable voltage power supply
CN106292825A (en) * 2016-09-10 2017-01-04 杭州电子科技大学 A kind of precision current source control circuit being suitable to grounding type resistance dependent sensor
CN106292825B (en) * 2016-09-10 2017-09-05 杭州电子科技大学 A kind of precision current source control circuit that dependent sensor is hindered suitable for grounding type
CN113224948A (en) * 2021-07-08 2021-08-06 上海芯龙半导体技术股份有限公司 Switching power supply circuit, switching power supply chip and switching power supply system
CN113224948B (en) * 2021-07-08 2021-09-24 上海芯龙半导体技术股份有限公司 Switching power supply circuit, switching power supply chip and switching power supply system

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