CN103078500B - Adjustable switch power supply - Google Patents
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- CN103078500B CN103078500B CN201310050255.4A CN201310050255A CN103078500B CN 103078500 B CN103078500 B CN 103078500B CN 201310050255 A CN201310050255 A CN 201310050255A CN 103078500 B CN103078500 B CN 103078500B
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Abstract
The invention discloses an adjustable switching power supply which comprises a switching power supply power loop, an adjustment control circuit, a main control circuit and an acquisition circuit. The master control circuit is used for generating an adjustable reference voltage signal; and the adjustment control circuit is used for generating a corresponding pulse width modulation signal according to the adjustable reference voltage signal, and controlling the working state of the power loop of the switching power supply through the pulse width modulation signal so as to adjust the output voltage signal of the power loop of the switching power supply. The main control circuit is also used for adjusting the feedback voltage signal so as to adjust the output voltage signal of the switching power supply. The adjustable switching power supply provided by the invention can adjust the output voltage signal of the switching power supply by adjusting the reference voltage signal or the feedback voltage signal, has the advantages of simple circuit structure, convenient adjustment operation, wide output voltage range and high precision, and improves the applicability of the switching power supply.
Description
Technical field
The present invention relates to switch power technology field, particularly relate to a kind of Adjustable switch power supply.
Background technology
Switching Power Supply utilizes modern power electronics technology, the time ratio that control switch pipe turns on and off, to maintain a kind of power supply of regulated output voltage.
Typical Switching Power Supply generally comprises control circuit and switching tube.Wherein, switching tube in current Switching Power Supply adopts power transistor MOSFET (Metal-Oxide-Semiconductor Field-EffectTransistor) usually, Chinese is translated into: metal-oxide layer-semiconductor-field-effect transistor, is called for short " metal-oxide half field effect transistor "; And the Main Function of control circuit in Switching Power Supply is: from switched power output sampling, compare with set point (reference voltage), be operated in the state of conducting or shutoff by control switch pipe, make the stable output of Switching Power Supply.
At present, the control circuit of Switching Power Supply is mainly pulse width modulation (Pulse Width Modulation, PWM) circuit, be called for short pulse width modulation circuit, its basic functional principle is: the reference voltage signal preset by the feedback voltage signal of switched power output collection being returned and pulse width modulation circuit is compared, obtain a pulse-width signal (abbreviation pwm signal), and this pwm signal is sent to the switching tube on switching power circuit.Pulse width modulation circuit, by changing pulse duration or the pulse frequency of this pwm signal, realizes the control of the Storage Unit to Switching Power Supply, thus makes the d. c. voltage signal of Switching Power Supply stable output.
In the prior art, the main purpose of the pulse width modulation circuit in Switching Power Supply is the stable output of maintained switch power supply.And default reference voltage signal is mainly provided by the fixing hardware circuit built in advance in pulse width regulating circuit, therefore, hardware circuit is once determine, the value of reference voltage signal just can not arbitrarily change.Switching Power Supply is after stable output, and its d. c. voltage signal exported in fact also is fixed value.
In various application scenario, realize the adjustment of the output voltage signal of Switching Power Supply by each electronic devices and components in welding control circuit again and unrealistic; And the electronic devices and components adopting hardware parameter adjustable (as slide rheostat etc.) change the output voltage signal size of Switching Power Supply, then adjusting range is little, precision is low.
Therefore, in Switching Power Supply conventional at present, a kind of Switching Power Supply can only export a kind of d. c. voltage signal, is often only applicable to power to a kind of electronic device, limits the applicability of Switching Power Supply.
Summary of the invention
Technical problem to be solved by this invention is, provides the Switching Power Supply that a kind of output voltage is adjustable, improves the applicability of Switching Power Supply.
For solving above technical problem, the invention provides a kind of Adjustable switch power supply, comprising Switching Power Supply loop of power circuit, adjustment control circuit, governor circuit and Acquisition Circuit.Input different reference voltage signals by governor circuit, with the process by adjustment control circuit, produce the pulse width modulating signal that duty ratio is different, thus control switch power loop exports different d. c. voltage signals.
Described governor circuit, for generation of adjustable reference voltage signal, and sends to described adjustment control circuit by described adjustable reference voltage signal.
Described adjustment control circuit, for according to described adjustable reference voltage signal, produce corresponding pulse width modulating signal, and described pulse width modulating signal is sent to described Switching Power Supply loop of power circuit, the operating state of described Switching Power Supply loop of power circuit is controlled, to adjust the output voltage signal of described Switching Power Supply loop of power circuit by described pulse width modulating signal.
Described Acquisition Circuit, for sampling to the output voltage signal of described Switching Power Supply loop of power circuit, producing feedback voltage signal, and described feedback voltage signal is sent to described adjustment control circuit.
Described adjustment control circuit, also for according to described feedback voltage signal, adjusts described pulse width modulating signal, and the pulse width modulating signal after adjustment is sent to described Switching Power Supply loop of power circuit.
Described adjustment control circuit comprises error amplifying circuit and pulse width modulation circuit.
Described error amplifying circuit, for accessing described adjustable reference voltage signal and described feedback voltage signal, and compares described adjustable reference voltage signal and described feedback voltage signal and amplifies process, obtains the Error Gain signal after amplifying.
Described pulse width modulation circuit is connected with described error amplifying circuit, for described adjustable Error Gain signal and the built-in reference voltage signal of described pulse width modulation circuit are carried out modulation treatment, produces the pulse width modulating signal that duty ratio is adjustable.
In one implementation, described error amplifying circuit comprises operational amplifier, the first resistance R1, the second resistance R2, the 3rd resistance R3 and the first electric capacity C1.
Wherein, one end of described first electric capacity C1 connects the inverting input of described operational amplifier, and the other end of described first electric capacity C1 is connected with one end of described first resistance R1, and the other end of described first resistance R1 connects the output of described operational amplifier.
One end of described second resistance R2 connects the inverting input of described operational amplifier, and the other end of described second resistance R2 is for accessing described feedback voltage signal.
One end of described 3rd resistance R3 connects the normal phase input end of described operational amplifier, and the other end of described 3rd resistance R3 is for accessing described reference voltage signal.
In the present invention, still further provides a kind of Adjustable switch power supply, comprise Switching Power Supply loop of power circuit, adjustment control circuit, governor circuit and Acquisition Circuit.Input different reference voltage signals by governor circuit, with the process by adjustment control circuit, produce the pulse width modulating signal that duty ratio is different, thus control switch power loop exports different d. c. voltage signals.
Described governor circuit, for generation of adjustable reference voltage signal, and sends to described adjustment control circuit by described adjustable reference voltage signal.
Described adjustment control circuit, for according to described adjustable reference voltage signal, produce corresponding pulse width modulating signal, and described pulse width modulating signal is sent to described Switching Power Supply loop of power circuit, the operating state of described Switching Power Supply loop of power circuit is controlled, to adjust the output voltage signal of described Switching Power Supply loop of power circuit by described pulse width modulating signal.
Described Acquisition Circuit, for sampling to the output voltage signal of described Switching Power Supply loop of power circuit, producing feedback voltage signal, and described feedback voltage signal is sent to described governor circuit.
Described governor circuit, also for processing described feedback voltage signal, producing feedback gain signal, and described feedback gain signal is sent to described adjustment control circuit.
Described adjustment control circuit, also for according to described feedback gain signal, adjusts described pulse width modulating signal, and the pulse width modulating signal after adjustment is sent to described Switching Power Supply loop of power circuit.
Adjustable switch power supply provided by the invention, by adopting a governor circuit, arranging the reference voltage signal of adjustment control circuit input, producing the pulse width modulating signal of certain duty ratio; Or, processed by the feedback voltage signal of governor circuit to Acquisition Circuit, change the duty ratio of described pulse width modulating signal.Adjust control circuit by described pulse width modulating signal being sent to the loop of power circuit in Switching Power Supply, the output voltage signal in automatic adjustment switch power loop.The general principle of Adjustable switch power supply provided by the invention is by reference voltage signal, or feedback voltage signal is adjusted, realize the adjustability of the output voltage signal of Switching Power Supply, its circuit structure is simple, it is easy to operate to adjust, output voltage range is wide, precision is high, improves the applicability of Switching Power Supply.
Accompanying drawing explanation
Fig. 1 is the structural representation of the first embodiment of Adjustable switch power supply provided by the invention;
Fig. 2 is the structural representation of the second embodiment of Adjustable switch power supply provided by the invention;
Fig. 3 is a kind of circuit structure diagram of the error amplifying circuit in the Adjustable switch power supply that provides of the second embodiment;
Fig. 4 is another circuit structure diagram of the error amplifying circuit in the Adjustable switch power supply that provides of the second embodiment;
Fig. 5 is the circuit structure diagram of the 3rd embodiment of Adjustable switch power supply provided by the invention;
Fig. 6 is the structural representation of the 4th embodiment of Adjustable switch power supply provided by the invention;
Fig. 7 is the structural representation of the 5th embodiment of Adjustable switch power supply provided by the invention;
Fig. 8 is the circuit structure diagram of the 6th embodiment of Adjustable switch power supply provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.
See Fig. 1, it is the structural representation of the first embodiment of Adjustable switch power supply provided by the invention.
In a first embodiment, this Adjustable switch power supply comprises Switching Power Supply loop of power circuit 101, adjustment control circuit 102, governor circuit 103 and Acquisition Circuit 104.
Described governor circuit 103, for generation of adjustable reference voltage signal, and sends to described adjustment control circuit 102 by described adjustable reference voltage signal.
Described adjustment control circuit 102, for according to described adjustable reference voltage signal, produce corresponding pulse width modulating signal, and described pulse width modulating signal is sent to described Switching Power Supply loop of power circuit 101, the operating state of described Switching Power Supply loop of power circuit 101 is controlled, to adjust the output voltage signal of described Switching Power Supply loop of power circuit 101 by described pulse width modulating signal.
Described Acquisition Circuit 104, for sampling to the output voltage signal of described Switching Power Supply loop of power circuit 101, producing feedback voltage signal, and described feedback voltage signal is sent to described adjustment control circuit 102.
Described adjustment control circuit 102, also for according to described feedback voltage signal, adjusts described pulse width modulating signal, and the pulse width modulating signal after adjustment is sent to described Switching Power Supply loop of power circuit 101.
In the present embodiment, this Switching Power Supply loop of power circuit 101 both can be booster circuit, also can be reduction voltage circuit.After input voltage signal is carried out power conversion by Switching Power Supply loop of power circuit 101, under the control adjusting control circuit 102 and governor circuit 103, produce the output voltage signal corresponding with described reference voltage signal.
In the present embodiment, described adjustment control circuit 102 is according to described adjustable reference voltage signal, produce the pulse width modulating signal of different duty, and described pulse width modulating signal is sent to described Switching Power Supply loop of power circuit 101, to adjust the output voltage signal of described Switching Power Supply loop of power circuit 101.
Duty ratio (Duty Ration) refers in a string desirable pulse period sequence (as square wave), the ratio in the duration of positive pulse and pulse total cycle.
In the present embodiment, adjustment control circuit 102, by processing reference voltage signal, carrys out the duty ratio of control impuls bandwidth modulation signals.After this pulse width modulating signal is sent to Switching Power Supply loop of power circuit 101 by adjustment control circuit 102, Switching Power Supply loop of power circuit 101 is according to the duty ratio (i.e. high level and low duration) of described pulse width modulating signal, automatically control the operating state of its internal electronic component, thus reach control switch power supply exports the d. c. voltage signal of certain value object at its output.
Particularly, Switching Power Supply loop of power circuit 101 can adopt current techique means of the prior art to realize.In conventional Switching Power Supply loop of power circuit 101, comprise switching tube and energy storage capacitor, and the electrical potential difference at described energy storage capacitor two ends is the output voltage signal of described Switching Power Supply loop of power circuit.
In the present embodiment, the course of work of Adjustable switch power supply mainly comprises: the reference voltage signal that adjustment control circuit 102 inputs according to governor circuit 103, produce the pulse width modulating signal with certain duty ratio, when described pulse width modulating signal is sent to the switching tube in Switching Power Supply loop of power circuit 101, the duty ratio of described pulse width modulating signal determines ON time and the deadline of described switching tube; And determine the ON time of described switching tube and deadline the discharge and recharge time of described energy storage capacitor, namely control the electrical potential difference at described energy storage capacitor two ends, thus the output voltage signal of described Switching Power Supply loop of power circuit.Therefore, in the present embodiment, during concrete enforcement, different reference voltage signals is inputted by governor circuit 103, with the process by adjustment control circuit 102, produce the pulse width modulating signal that duty ratio is different, thus controllable switch power loop 101 exports different d. c. voltage signals, namely realizes the adjustability of the output voltage signal of Switching Power Supply.
Acquisition Circuit 104, for sampling to the output voltage signal of described Switching Power Supply loop of power circuit 101, produces feedback voltage signal, and described feedback voltage signal is sent to described adjustment control circuit 102.
In the present embodiment, adjustment control circuit 102 also can receive the feedback voltage signal that Acquisition Circuit 104 sends, according to the difference of described feedback voltage signal and described reference voltage signal, the duty ratio of described pulse width modulating signal is adjusted, and the pulse width modulating signal after adjustment is sent to described Switching Power Supply loop of power circuit 101.
In the present embodiment, the main purpose of Acquisition Circuit 104 is the output voltages to switch power loop 101, namely the actual output voltage signal of Adjustable switch power supply that the present embodiment provides carries out inching, the output of burning voltage signal, makes actual output voltage adjust to the target output voltage signal corresponding with reference voltage.
Referring to Fig. 2, it is the structural representation of the second embodiment of Adjustable switch power supply provided by the invention.
In a second embodiment, further, described adjustment control circuit comprises error amplifying circuit 1021 and pulse width modulation circuit 1022.
Described error amplifying circuit 1021, for accessing described adjustable reference voltage signal and described feedback voltage signal, and compares described adjustable reference voltage signal and described feedback voltage signal and amplifies process, obtains the Error Gain signal after amplifying.
Described pulse width modulation circuit 1021 is connected with described error amplifying circuit 1021, for described adjustable Error Gain signal and the built-in reference voltage signal of described pulse width modulation circuit are carried out modulation treatment, produce the pulse width modulating signal that duty ratio is adjustable.
During concrete enforcement, pulse width modulation circuit 1022, by building circuit, is built-in with reference voltage signal.Described reference voltage signal includes but not limited to triangular wave or sawtooth signal.
In the present embodiment, when described reference voltage signal be a kind of desirable there is the sawtooth signal of cycle T time, after error amplifying circuit 1021 pairs of reference voltage signals and feedback voltage signal process, the Error Gain signal of generation is delivered in pulse width modulation circuit 1022, carries out modulation treatment with described sawtooth signal.During concrete enforcement, pulse width modulation circuit 1022 according to different Error Gain signals, will produce the pulse width modulating signal that duty ratio is different; And the sizes values of Error Gain signal is by the input signal of error amplifying circuit 1021, i.e. reference voltage signal and feedback voltage signal co-controlling.
Referring to Fig. 3, it is a kind of circuit structure diagram of the error amplifying circuit in the Adjustable switch power supply that provides of the second embodiment.
Particularly, can in implementation in one, described error amplifying circuit 1021 comprises operational amplifier U1, the first resistance R1, the second resistance R2, the 3rd resistance R3 and the first electric capacity C1.
Wherein, one end of described first electric capacity C1 connects the inverting input of described operational amplifier U1, and the other end of described first electric capacity C1 is connected with one end of described first resistance R1, and the other end of described first resistance R1 connects the output of described operational amplifier U1.
One end of described second resistance R2 connects the inverting input of described operational amplifier U1, and the other end of described second resistance R2 is for accessing described feedback voltage signal.
One end of described 3rd resistance R3 connects the normal phase input end of described operational amplifier U1, and the other end of described 3rd resistance R3 is for accessing described reference voltage signal.
In the present embodiment, error amplifying circuit 1021 couples of reference voltage signal VFB and feedback voltage signal Vref make calculus of differences, the error signal obtained are done to amplify process, obtain output signal, i.e. Error Gain signal Vcom.When the reference voltage signal set in pulse width modulation circuit 1022 is as Vc, then, after pulse width modulation circuit 1022 couples of Error Gain signal Vcom carry out modulation treatment, obtain the pulse width modulating signal Vpwm of certain duty ratio.Pulse width modulation circuit 1022, by the duty ratio of control impuls bandwidth modulation signals Vpwm, determines the target output voltage signal Vout of Switching Power Supply loop of power circuit 101.Therefore, when needing Switching Power Supply loop of power circuit 101 to export the d. c. voltage signal of a certain desired value, need to determine by inputting a corresponding reference voltage signal.
But in concrete practice process, owing to there are multiple power electronic devices and components in Switching Power Supply loop of power circuit 101, under pulse width modulation circuit 1022 controls, Switching Power Supply loop of power circuit 101 is not once receive described pulse width modulating signal V
pwmjust the target output voltage signal V of its internal circuit stable output can be controlled at once
out.Therefore, when specifically implementing, need to utilize the actual output voltage signal in Acquisition Circuit 104 pairs of switch power loops 101 gather and feed back.Error amplifying circuit 1021 by comparing the error of feedback voltage signal and reference voltage signal, pulse-width modulated signal V
pwmcarry out inching, thus make the output voltage stabilization of whole Switching Power Supply.
During concrete enforcement, the waveform of reference voltage signal Vc is generally fixed, as triangular wave or sawtooth waveforms etc. by pulse width modulation circuit 1022 internal circuit configuration.
Further, in the Adjustable switch power supply that the present embodiment provides, described error amplifying circuit also comprises the second electric capacity C2, the 3rd electric capacity C3 and the 4th electric capacity C4.
Referring to Fig. 4, it is another circuit structure diagram of the error amplifying circuit in the Adjustable switch power supply that provides of the second embodiment.
Further, described error amplifying circuit 1021 also comprises the second electric capacity C2, the 3rd electric capacity C3 and the 4th electric capacity C4.
One end of described second electric capacity C2 is connected to the inverting input of described operational amplifier U1, and the other end of described second electric capacity C2 is connected to the output of described operational amplifier U1.The effect of the second electric capacity C2 strengthens the gain of low frequency signal and reduces the gain of high-frequency signal.
One end of described 3rd electric capacity C3 is connected to the inverting input of described operational amplifier U1, and the other end of described 3rd electric capacity C3 is connected to the normal phase input end of described operational amplifier U1.
One end of described 4th electric capacity C4 is connected to the positive power source terminal of described operational amplifier U1, the other end ground connection of described 4th electric capacity C4.In the present embodiment, the high frequency ripple of the 4th electric capacity C4 on the power supply of filtering operational amplifier U1.
Referring to Fig. 5, it is the circuit structure diagram of the 3rd embodiment of Adjustable switch power supply provided by the invention.
In the present embodiment, a kind of physical circuit connected mode of Adjustable switch power supply is given.Wherein, pulse width modulation circuit 1022 is realized by Switching Power Supply control chip OB3350NCPA (OB); wherein the pin 1 of Switching Power Supply control chip OB3350NCPA (OB) is the Power supply pin of chip; pin 2 is pwm control signal output pin; pin 3 is power ground pin; pin 4 is MOSFET tube current detection input pin; pin 5 is feedback voltage input pin; pin 6 is loop compensation pin; pin 7 is overvoltage protection pin, and pin 8 is outside PWM brilliance control pin.
In the present embodiment, in the Adjustable switch power supply that the present embodiment provides, the first filter circuit, the second filter circuit is also comprised.
Described first filter circuit, for carrying out filtering process to described reference voltage signal, producing DC reference voltage signal, and described DC reference voltage signal is sent to described 3rd resistance R3.
Described second filter circuit, for carrying out filtering process to described feedback voltage signal, removes the noise of described feedback voltage signal, and the feedback voltage signal after removing noise is sent to described second resistance R2.
Particularly, described first filter circuit is made up of the 4th resistance R4 and the 5th electric capacity C5; Described second filter circuit is made up of the 5th resistance R5 and the 6th electric capacity C6.
In the present embodiment, Acquisition Circuit 104 is by the feedback voltage signal obtained of sampling in the output voltage signal from Switching Power Supply loop of power circuit 101, the adjustable reference voltage signal produced with governor circuit 103 compares in error originated from input amplifying circuit respectively through after filtering, produce Error Gain signal, and Error Gain signal is sent to Switching Power Supply control chip OB3350NCPA (OB).Switching Power Supply control chip OB3350NCPA (OB) produces the pulse width modulating signal of certain duty ratio, and the operating state of switch tube MOSFET controls, thus the output voltage values in adjustment Switching Power Supply loop of power circuit.
Particularly, in the present embodiment, the output voltage signal of Switching Power Supply and feedback voltage signal change along with the change of reference voltage signal.
In sum, the Adjustable switch power supply that the present invention first, second, and third embodiment provides, by adopting a governor circuit, for adjustment control circuit provides an adjustable reference voltage signal, produce pulse width modulating signal, and by adjusting the duty ratio of described pulse width modulating signal, the output voltage signal in automatic adjustment switch power loop.Its general principle is by inputting an adjustable reference voltage signal, to realize the adjustability of the output voltage signal of Switching Power Supply.
Referring to Fig. 6, it is the structural representation of the 4th embodiment of Adjustable switch power supply provided by the invention.
A kind of Adjustable switch power supply provided in the fourth embodiment, comprises Switching Power Supply loop of power circuit 101, adjustment control circuit 102, governor circuit 103 and Acquisition Circuit 104.
Described governor circuit 103, for generation of adjustable reference voltage signal, and sends to described adjustment control circuit 102 by described adjustable reference voltage signal.
Described adjustment control circuit 102, for according to described adjustable reference voltage signal, produce corresponding pulse width modulating signal, and described pulse width modulating signal is sent to described Switching Power Supply loop of power circuit 101, the operating state of described Switching Power Supply loop of power circuit 101 is controlled, to adjust the output voltage signal of described Switching Power Supply loop of power circuit 101 by described pulse width modulating signal.
Described Acquisition Circuit 104, for sampling to the output voltage signal of described Switching Power Supply loop of power circuit 101, producing feedback voltage signal, and described feedback voltage signal is sent to described governor circuit 103.
Described governor circuit 103, also for processing described feedback voltage signal, producing feedback gain signal, and described feedback gain signal is sent to described adjustment control circuit 102.
Described adjustment control circuit 102, also for according to described feedback gain signal, adjusts described pulse width modulating signal, and the pulse width modulating signal after adjustment is sent to described Switching Power Supply loop of power circuit 101.
In the present embodiment, feedback voltage signal VFB is sent to governor circuit 103 and first carries out preliminary treatment by Acquisition Circuit 104.Be provided with the desired value VFB0 of feedback voltage signal in governor circuit 103, wherein this feedback voltage signal desired value VFB0 is relevant with the first value of establishing of reference voltage signal Vref again.After governor circuit 103 receives the feedback voltage signal VFB of the reality of Acquisition Circuit 104 Real-time Feedback, the feedback voltage signal desired value VFB0 established in the feedback voltage signal VFB of this reality and governor circuit 103 is compared, obtain feedback voltage signal error amount, again amplification process is carried out to described feedback voltage signal error amount, obtain feedback gain signal VFB1.This feedback gain signal VFB1 and reference voltage signal Vref is sent to described adjustment control circuit 102 and makes subsequent treatment by last governor circuit 103 again.
In the present embodiment, because governor circuit 103 pairs of feedback voltage signals have carried out preliminary treatment, therefore, can adjust feedback voltage signal on the one hand, thus the duty ratio of control impuls bandwidth modulation signals, and then can the output voltage signal in control switch power loop 101; On the other hand, amplification process can be carried out to the error of feedback voltage signal, thus make adjustment control circuit 102 obtain the more accurate pulse width modulating signal of duty ratio, thus the regulated efficiency of the output voltage signal to switch power loop 101 can be improved.
Fig. 7 is the structural representation of the 5th embodiment of Adjustable switch power supply provided by the invention.
In the 5th embodiment, the described adjustment control circuit 102 of Adjustable switch power supply comprises error amplifying circuit 1021 and pulse width modulation circuit 1022.
Described error amplifying circuit 1021, for accessing described adjustable reference voltage signal and described feedback gain signal, and compares described adjustable reference voltage signal and described feedback gain signal and amplifies process, obtains the Error Gain signal after amplifying.
Described pulse width modulation circuit 1022 is connected with described error amplifying circuit 1021, for described adjustable Error Gain signal and the built-in reference voltage signal of described pulse width modulation circuit are carried out modulation treatment, produce the pulse width modulating signal that duty ratio is adjustable.
Further, described error amplifying circuit 1021 comprises operational amplifier U1, the first resistance R1, the second resistance R2, the 3rd resistance R3 and the first electric capacity C1.
Can referring to a kind of circuit structure diagram of the error amplifying circuit shown in Fig. 3.In the present embodiment, the circuit theory of error amplifying circuit 1021 and function are identical with function with the circuit theory shown in Fig. 3 of the second embodiment.
Wherein, one end of described first electric capacity C1 connects the inverting input of described operational amplifier U1, and the other end of described first electric capacity C1 is connected with one end of described first resistance R1, and the other end of described first resistance R1 connects the output of described operational amplifier U1.
One end of described second resistance R2 connects the U1 inverting input of described operational amplifier, and the other end of described second resistance R2 is for accessing described feedback voltage signal.
One end of described 3rd resistance R3 connects the normal phase input end of described operational amplifier U1, and the other end of described 3rd resistance R3 is for accessing described reference voltage signal.
Further, in the present embodiment, the error amplifying circuit 1021 of Adjustable switch power supply also comprises the second electric capacity C2, the 3rd electric capacity C3 and the 4th electric capacity C4.
Can referring to another circuit structure diagram of the error amplifying circuit shown in Fig. 4.
One end of described second electric capacity C2 is connected to the inverting input of described operational amplifier U1, and the other end of described second electric capacity C2 is connected to the output of described operational amplifier U1.
One end of described 3rd electric capacity C3 is connected to the inverting input of described operational amplifier U1, and the other end of described 3rd electric capacity C3 is connected to the normal phase input end of described operational amplifier U1.
One end of described 4th electric capacity C4 is connected to the positive power source terminal of described operational amplifier U1, the other end ground connection of described 4th electric capacity C4.
In the present embodiment, the circuit theory of error amplifying circuit 1021 and function are identical with function with the circuit theory shown in second embodiment Fig. 4.
Fig. 8 is the circuit structure diagram of the 6th embodiment of Adjustable switch power supply provided by the invention.
In the present embodiment, a kind of physical circuit connected mode of Adjustable switch power supply is given.Wherein, pulse width modulation circuit 1022 is realized by Switching Power Supply control chip OB3350NCPA (OB), and the function of Switching Power Supply control chip OB3350NCPA (OB) is consistent with the content described by operation principle and the 3rd embodiment.
In the Adjustable switch power supply that the present embodiment provides, the distinctive points of itself and the Adjustable switch power supply described in first, second and third embodiment is: in the present embodiment, first feedback voltage signal is inputed to carry out in governor circuit whole, can realize not changing on the basis of reference voltage signal, changed the duty ratio of pulse width modulating signal by adjustment control circuit, thus realize the adjustment to the output voltage signal in switch power loop.
Particularly, the resistance R6 in Fig. 8 and resistance R7 forms Acquisition Circuit, and voltage end B holds the output for Acquisition Circuit.The output voltage signal of Acquisition Circuit to switch power loop gathers, and the feedback voltage signal VFB of acquisition is sent to governor circuit 103; Governor circuit 103 the feedback gain signal VFB1 obtained feedback voltage signal VFB process, is sent to error amplifying circuit 1021 together with reference voltage signal Vref again.The subsequent processes of the functional modules such as error amplifying circuit 1021 is identical with the principle described in the 3rd embodiment.
In the present embodiment, feedback voltage signal Acquisition Circuit fed back carries out pretreated benefit, governor circuit can further to two factors of influence of adjustment control circuit, and namely two input signals (reference voltage signal and feedback voltage signal) control.Wherein, can by adjusting any one factor of influence to reach the object of the output voltage signal of adjustment Switching Power Supply.
Particularly, in the present embodiment, processed by governor circuit 103 pairs of feedback voltage signals, obtain feedback gain signal, again by adjusting described feedback gain signal to control the output signal of adjustment control circuit 102, i.e. pulse width modulating signal, and then the output voltage signal in control switch power loop 101.
In the present embodiment, further, described Adjustable switch power supply, also comprises the first filter circuit, the second filter circuit.
Wherein, described first filter circuit is used for carrying out filtering process to described reference voltage signal, produces DC reference voltage signal, and described DC reference voltage signal is sent to described 3rd resistance R3.
Described second filter circuit is used for carrying out filtering process to described feedback voltage signal, removes the noise of described feedback voltage signal, and the feedback voltage signal after removing noise is sent to described second resistance R2.
Particularly, described first filter circuit is made up of the 4th resistance R4 and the 5th electric capacity C5; Described second filter circuit is made up of the 5th resistance R5 and the 6th electric capacity C6.
Adjustable switch power supply provided by the invention, by the input signal to adjustment control circuit, comprise reference voltage signal and feedback voltage signal adjusts, realize the adjustment of the output voltage signal to Switching Power Supply, its circuit structure is simple, it is easy to operate to adjust, output voltage range is wide, precision is high, improves the applicability of Switching Power Supply.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (8)
1. an Adjustable switch power supply, is characterized in that, comprises Switching Power Supply loop of power circuit, adjustment control circuit, governor circuit and Acquisition Circuit; Input different reference voltage signals by governor circuit, with the process by adjustment control circuit, produce the pulse width modulating signal that duty ratio is different, thus control switch power loop exports different d. c. voltage signals;
Described governor circuit, for generation of adjustable reference voltage signal, and sends to described adjustment control circuit by described adjustable reference voltage signal;
Described adjustment control circuit, for according to described adjustable reference voltage signal, produce corresponding pulse width modulating signal, and described pulse width modulating signal is sent to described Switching Power Supply loop of power circuit, the operating state of described Switching Power Supply loop of power circuit is controlled, to adjust the output voltage signal of described Switching Power Supply loop of power circuit by described pulse width modulating signal;
Described Acquisition Circuit, for sampling to the output voltage signal of described Switching Power Supply loop of power circuit, producing feedback voltage signal, and described feedback voltage signal is sent to described adjustment control circuit;
Described adjustment control circuit, also for according to described feedback voltage signal, adjusts described pulse width modulating signal, and the pulse width modulating signal after adjustment is sent to described Switching Power Supply loop of power circuit; Described adjustment control circuit comprises error amplifying circuit and pulse width modulation circuit;
Described error amplifying circuit, for accessing described adjustable reference voltage signal and described feedback voltage signal, and compares described adjustable reference voltage signal and described feedback voltage signal and amplifies process, obtains the Error Gain signal after amplifying;
Described pulse width modulation circuit is connected with described error amplifying circuit, for described adjustable Error Gain signal and the built-in reference voltage signal of described pulse width modulation circuit are carried out modulation treatment, produces the pulse width modulating signal that duty ratio is adjustable.
2. Adjustable switch power supply as claimed in claim 1, it is characterized in that, described error amplifying circuit comprises operational amplifier, the first resistance R1, the second resistance R2, the 3rd resistance R3 and the first electric capacity C1;
Wherein, one end of described first electric capacity C1 connects the inverting input of described operational amplifier, and the other end of described first electric capacity C1 is connected with one end of described first resistance R1, and the other end of described first resistance R1 connects the output of described operational amplifier;
One end of described second resistance R2 connects the inverting input of described operational amplifier, and the other end of described second resistance R2 is for accessing described feedback voltage signal;
One end of described 3rd resistance R3 connects the normal phase input end of described operational amplifier, and the other end of described 3rd resistance R3 is for accessing described reference voltage signal.
3. Adjustable switch power supply as claimed in claim 2, it is characterized in that, described error amplifying circuit also comprises the second electric capacity C2, the 3rd electric capacity C3 and the 4th electric capacity C4;
One end of described second electric capacity C2 is connected to the inverting input of described operational amplifier, and the other end of described second electric capacity C2 is connected to the output of described operational amplifier;
One end of described 3rd electric capacity C3 is connected to the inverting input of described operational amplifier, and the other end of described 3rd electric capacity C3 is connected to the normal phase input end of described operational amplifier;
One end of described 4th electric capacity C4 is connected to the positive power source terminal of described operational amplifier, the other end ground connection of described 4th electric capacity C4.
4. Adjustable switch power supply as claimed in claim 3, is characterized in that, also comprise the first filter circuit, the second filter circuit;
Described first filter circuit, for carrying out filtering process to described reference voltage signal, producing DC reference voltage signal, and described DC reference voltage signal is sent to described 3rd resistance R3;
Described second filter circuit, for carrying out filtering process to described feedback voltage signal, removes described feedback
The noise of voltage signal, and the feedback voltage signal after removing noise is sent to described second resistance R2.
5. Adjustable switch power supply as claimed in claim 4, it is characterized in that, described first filter circuit is made up of the 4th resistance R4 and the 5th electric capacity C5; Described second filter circuit is made up of the 5th resistance R5 and the 6th electric capacity C6.
6. an Adjustable switch power supply, is characterized in that, comprises Switching Power Supply loop of power circuit, adjustment control circuit, governor circuit and Acquisition Circuit; Input different reference voltage signals by governor circuit, with the process by adjustment control circuit, produce the pulse width modulating signal that duty ratio is different, thus control switch power loop exports different d. c. voltage signals;
Described governor circuit, for generation of adjustable reference voltage signal, and sends to described adjustment control circuit by described adjustable reference voltage signal;
Described adjustment control circuit, for according to described adjustable reference voltage signal, produce corresponding pulse width modulating signal, and described pulse width modulating signal is sent to described Switching Power Supply loop of power circuit, the operating state of described Switching Power Supply loop of power circuit is controlled, to adjust the output voltage signal of described Switching Power Supply loop of power circuit by described pulse width modulating signal;
Described Acquisition Circuit, for sampling to the output voltage signal of described Switching Power Supply loop of power circuit, producing feedback voltage signal, and described feedback voltage signal is sent to described governor circuit;
Described governor circuit, also for processing described feedback voltage signal, producing feedback gain signal, and described feedback gain signal is sent to described adjustment control circuit;
Described adjustment control circuit, also for according to described feedback gain signal, adjusts described pulse width modulating signal, and the pulse width modulating signal after adjustment is sent to described Switching Power Supply loop of power circuit; Described adjustment control circuit comprises error amplifying circuit and pulse width modulation circuit;
Described error amplifying circuit, for accessing described adjustable reference voltage signal and described feedback gain signal, and compares described adjustable reference voltage signal and described feedback gain signal and amplifies process, obtains the Error Gain signal after amplifying;
Described pulse width modulation circuit is connected with described error amplifying circuit, for described adjustable Error Gain signal and the built-in reference voltage signal of described pulse width modulation circuit are carried out modulation treatment, produces the pulse width modulating signal that duty ratio is adjustable.
7. Adjustable switch power supply as claimed in claim 6, it is characterized in that, described error amplifying circuit comprises operational amplifier, the first resistance R1, the second resistance R2, the 3rd resistance R3 and the first electric capacity C1;
Wherein, one end of described first electric capacity C1 connects the inverting input of described operational amplifier, and the other end of described first electric capacity C1 is connected with one end of described first resistance R1, and the other end of described first resistance R1 connects the output of described operational amplifier;
One end of described second resistance R2 connects the inverting input of described operational amplifier, and the other end of described second resistance R2 is for accessing described feedback voltage signal;
One end of described 3rd resistance R3 connects the normal phase input end of described operational amplifier, and the other end of described 3rd resistance R3 is for accessing described reference voltage signal.
8. Adjustable switch power supply as claimed in claim 7, it is characterized in that, described error amplifying circuit also comprises the second electric capacity C2, the 3rd electric capacity C3 and the 4th electric capacity C4;
One end of described second electric capacity C2 is connected to the inverting input of described operational amplifier, and the other end of described second electric capacity C2 is connected to the output of described operational amplifier;
One end of described 3rd electric capacity C3 is connected to the inverting input of described operational amplifier, and the other end of described 3rd electric capacity C3 is connected to the normal phase input end of described operational amplifier;
One end of described 4th electric capacity C4 is connected to the positive power source terminal of described operational amplifier, the other end ground connection of described 4th electric capacity C4.
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| US9367109B2 (en) * | 2013-07-11 | 2016-06-14 | Qualcomm Incorporated | Switching power supply with noise control |
| CN103997206B (en) * | 2014-05-20 | 2017-04-12 | 华为技术有限公司 | Switching power source |
| CN105048773A (en) * | 2015-07-23 | 2015-11-11 | 深圳开立生物医疗科技股份有限公司 | Output voltage control circuit |
| CN107911007A (en) * | 2017-12-19 | 2018-04-13 | 苏州华兴源创电子科技有限公司 | A kind of reference voltage output device and Switching Power Supply |
| CN110299819B (en) * | 2019-06-05 | 2021-07-20 | 茂硕电源科技股份有限公司 | Digital power supply control circuit and method |
| CN115903988B (en) * | 2023-02-27 | 2023-06-16 | 常州联影智融医疗科技有限公司 | Constant current source device |
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