CN208971381U - The SS (soft start) control circuit of Switching Power Supply - Google Patents
The SS (soft start) control circuit of Switching Power Supply Download PDFInfo
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Abstract
The utility model provides a kind of SS (soft start) control circuit of Switching Power Supply, including output voltage division module, comparator, reference voltage module and biasing module.The output voltage division module generates the first feedback voltage and the second feedback voltage, and first feedback voltage is inputted into the comparator, the current potential of second feedback voltage is lower than the current potential of first feedback voltage, the comparator receives the reference voltage of the biasing module output, and reference voltage is generated in conjunction with first feedback voltage, in soft start-up process, the output voltage of the reference voltage module is determined according to the low and high level of the reference voltage.Therefore, the embodiments of the present invention are realized in the case where ensuring that the soft starting circuit of switching power source chip normally starts, and save the purpose of switching power source chip cost.
Description
Technical field
The utility model relates to a kind of controls of the soft start of semiconductor integrated circuit technology field more particularly to Switching Power Supply
Circuit.
Background technique
Constantly increase in the fields such as communication, computer and consumer electronics recently as portable electronic product, it is right
The demand of power management chip also exponentially ascendant trend, wherein work efficiency is high by itself for inductance type switching power source chip
With the advantages such as self-heating is smaller, it is widely used in the portable devices such as smart phone, MP3, digital camera.
On startup, the output of the error amplifier in soft starting circuit is electric for the soft starting circuit of traditional switch power supply chip
Pressure is constantly in higher level, and the loop in circuit is made to be in maximum duty ratio state for a long time, generates very big surge electricity
Stream, so as to cause very big overshoot voltage is generated in the output capacitance of Switching Power Supply.Due to excessive surge current and overshoot electricity
Pressure will lead to power tube or other circuit burnouts in switching power source chip.Therefore, in the prior art, soft starting circuit passes through
Na level low current charge generates the starting time that delay voltage carrys out control switch power supply.But Yao Shixian na level low current
Charging, the manufacture craft that will lead to soft starting circuit occur great variety, are easily formed and interfered to soft starting circuit, lead to soft start
It is abnormal when circuit start and soft starting circuit output voltage increases, so that bigger capacitor be needed to come to soft starting circuit
The starting time causes to be delayed, and the area for occupying chip can be also gradually increased.
From the above mentioned it is found that the soft starting circuit of switching power source chip in the prior art can not ensure normally to start
In the case of, save chip cost.
Utility model content
In view of this, the present invention provides a kind of SS (soft start) control circuits of Switching Power Supply, are ensuring to switch to realize
In the case that the soft starting circuit of power supply chip normally starts, do not increase chip area, saves the purpose of chip cost.
To achieve the above object, the utility model embodiment provides the following technical solutions:
The utility model first aspect discloses a kind of SS (soft start) control circuit of Switching Power Supply, comprising: output voltage point
Press VOUT_DIV module, comparator COMP, reference voltage VREF SEL module and biasing module BIAS；
The output end of the output voltage partial pressure VOUT_DIV module is connected with the non-inverting input terminal of the comparator COMP,
For generating the first feedback voltage V FB and the second feedback voltage V FB_CMP, and will be described in the first feedback voltage V FB input
The current potential of comparator COMP, the second feedback voltage V FB_CMP are lower than the current potential of the first feedback voltage V FB；
The inverting input terminal of the comparator COMP is connected with the output end of biasing module BIAS, the comparator COMP's
Output end is connected with the input terminal of the reference voltage VREF SEL module, the comparator COMP, for receiving the bias
The reference voltage VREF of module BIAS output, and reference voltage VSEL is generated in conjunction with the first feedback voltage V FB, in soft start
In the process, the output voltage of the reference voltage VREF SEL module is determined according to the low and high level of the reference voltage VSEL.
Preferably, during soft start, the current potential based on the first feedback voltage V FB rises, in the benchmark
In the case where current potential of the current potential of voltage VREF always above the first feedback voltage V FB, the reference voltage VSEL is low
Level, the comparator COMP, for selecting the second feedback voltage V FB_CMP to the electricity of the reference voltage VREF SEL module
Press the output of the end VREF_SS.
Preferably, during soft start, the current potential based on the first feedback voltage V FB rises, if described first
When the current potential of feedback voltage V FB is higher than the current potential of the reference voltage VREF, the reference voltage VSEL is high level, the ratio
Compared with device COMP, for selecting reference voltage VREF to export to the end voltage VREF_SS of the reference voltage VREF SEL module.
Preferably, in the soft starting circuit of above-mentioned Switching Power Supply, the reference voltage VREF SEL module is opened for MOS
It closes.
The utility model second aspect discloses a kind of Switching Power Supply, comprising: Switching Power Supply disclosed in first aspect is soft to be opened
Dynamic control circuit, the gate driving circuit POWERMOS of error amplifier ERROR_AMP, comparator PWM and power tube
GATEDRIVER；
The input terminal of the SS (soft start) control circuit is connected with output voltage VO UT, the output of the SS (soft start) control circuit
End is connected with the error amplifier ERROR_AMP, is used for outputting reference voltage VREF_SS and the first feedback voltage V FB；
The error amplifier ERROR_AMP receive SS (soft start) control circuit output reference voltage VREF_SS and
First feedback voltage V FB, and it is electric compared with the output of the error of reference voltage VREF_SS by the first feedback voltage V FB of amplification
Press COMP；
The input terminal of the comparator PWM module is connected with the output end of the error amplifier ERROR_AMP, the ratio
Compared with the comparison voltage COMP for the output that the input terminal of device PWM module receives the error amplifier ERROR_AMP, and combine oblique
Slope offset voltage VSLOPE generates the gate driving circuit POWERMOS GATEDRIVER for driving the power tube；
The input terminal and comparator PWM output end of the gate driving circuit POWERMOS GATEDRIVER of the power tube
It is connected, the output end and power tube M of the gate driving circuit POWERMOS GATEDRIVER of the power tubeNGrid LSG and
Power tube MPGrid HSG be connected, driving switch power supply.
Preferably, in above-mentioned Switching Power Supply, further includes: RC compensation network RC Compen；
The output end of the RC compensation network RC Compen and the error amplifier ERROR_AMP and comparator PWM's
Input terminal is connected, for compensating resistance capacitance for Switching Power Supply.
Preferably, in above-mentioned Switching Power Supply, the Switching Power Supply is BOOST Switching Power Supply.
The utility model third aspect discloses a kind of soft start control method of Switching Power Supply, and it is public to be suitable for first aspect
The switch power soft-start control circuit opened, the switch power soft-start control circuit include output voltage partial pressure VOUT_DIV
Module, comparator COMP, reference voltage VREF SEL module and BIAS module；This method comprises:
In soft start-up process, the output voltage partial pressure VOUT_DIV module control inputs the same phase of comparator COMP
First feedback voltage V FB current potential of input terminal, wherein the second feedback that the output voltage partial pressure VOUT_DIV module generates
The current potential of voltage VFB_CMP is lower than the current potential of the first feedback voltage V FB；
The bias BIAS module is via the comparator COMP inverting input terminal to the comparator COMP input reference
Voltage VREF；
The comparator COMP is based on the first feedback voltage V FB and reference voltage VREF and generates reference voltage
VSEL, and determine based on the low and high level of the reference voltage VSEL output voltage of the reference voltage VREF SEL module.
Preferably, in the soft start control method of above-mentioned Switching Power Supply, if the output voltage divides VOUT_DIV mould
The first feedback voltage V FB potential duration that block control inputs the comparator COMP non-inverting input terminal rises, in the BIAS mould
Block inputs electricity of the current potential always above the first feedback voltage V FB of the reference voltage VREF of the comparator COMP inverting input terminal
In the case where position, the comparator COMP is based on the first feedback voltage V FB and reference voltage VREF and generates with reference to electricity
VSEL is pressed, and determines the output electricity of the reference voltage VREF SEL module based on the low and high level of the reference voltage VSEL
Pressure, comprising:
It is low level that the comparator COMP is based on the first feedback voltage V FB and reference voltage VREF generation
Reference voltage VSEL determines output voltage of the second feedback voltage V FB_CMP as the reference voltage VREF SEL module
VREF_SS。
Preferably, in the soft start control method of above-mentioned Switching Power Supply, if the output voltage divides VOUT_DIV mould
The first feedback voltage V FB potential duration that block control inputs the comparator COMP non-inverting input terminal rises, in the first feedback electricity
The current potential of pressure VFB is more than the current potential for the reference voltage VREF that the BIAS module inputs the comparator COMP inverting input terminal
In the case of, the comparator COMP is based on the first feedback voltage V FB and reference voltage VREF and generates reference voltage
VSEL, and determine based on the low and high level of the reference voltage VSEL output voltage of the reference voltage VREF SEL module,
Include:
The comparator COMP generates high level based on the first feedback voltage V FB and reference voltage VREF
Reference voltage VSEL determines output voltage VREF_SS of the reference voltage VREF as the reference voltage VREF SEL module.
Based on a kind of above-mentioned SS (soft start) control circuit of Switching Power Supply provided by the utility model, the output voltage partial pressure
VOUT_DIV module generates the first feedback voltage V FB and the second feedback voltage V FB_CMP, and by the first feedback voltage V FB
The comparator COMP is inputted, the current potential of the second feedback voltage V FB_CMP is lower than the electricity of the first feedback voltage V FB
Position, the comparator COMP receive the reference voltage VREF of the biasing module BIAS output, and in conjunction with the first feedback electricity
Pressure VFB generates reference voltage VSEL and determines the base according to the low and high level of the reference voltage VSEL in soft start-up process
The output voltage of quasi- voltage VREF SEL module.It ensures that the soft starting circuit of switching power source chip normally starts, and saves and open
Powered-down source chip cost.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 is a kind of structural schematic diagram of the SS (soft start) control circuit of Switching Power Supply disclosed in the utility model embodiment；
Fig. 2 is a kind of configuration diagram of switching power circuit disclosed in the utility model embodiment；
Fig. 3 is a kind of flow diagram of the soft start control method of Switching Power Supply disclosed in the utility model embodiment.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
In this application, the terms "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion,
So that the process, method, article or equipment for including a series of elements not only includes those elements, but also including not having
The other element being expressly recited, or further include for elements inherent to such a process, method, article, or device.Do not having
There is the element limited in the case where more limiting by sentence "including a ...", it is not excluded that in the mistake including the element
There is also other identical elements in journey, method, article or equipment.
It can be seen from background technology that in the prior art, generate delay voltage using na level low current charge come control switch
The method of the soft-start time of power supply causes the manufacture craft of soft starting circuit that great variety occurs, easily to soft starting circuit shape
At interference, soft starting circuit is abnormal when starting and soft starting circuit output voltage increases, so that bigger capacitor be needed
The starting time of soft starting circuit is caused to be delayed, the area for occupying chip can be also gradually increased.Therefore, the utility model discloses
A kind of SS (soft start) control circuit of Switching Power Supply, normally starts for realizing in the soft starting circuit for ensuring switching power source chip
In the case where, do not increase chip area, saves the purpose of chip cost.
As shown in Figure 1, the structure that the utility model embodiment discloses a kind of SS (soft start) control circuit of Switching Power Supply is shown
It is intended to, comprising: output voltage divides VOUT_DIV module, comparator COMP, reference voltage module and biasing module BIAS.
The output end of the output voltage partial pressure VOUT_DIV module is connected with the non-inverting input terminal of the comparator COMP,
For generating the first feedback voltage V FB and the second feedback voltage V FB_CMP, and will be described in the first feedback voltage V FB input
The current potential of comparator COMP, the second feedback voltage V FB_CMP are lower than the current potential of the first feedback voltage V FB.
It should be noted that the feedback of the first feedback voltage V FB and second that the output voltage VO UT_DIV module generates
Voltage VFB_CMP is that output voltage VO UT is generated by output voltage partial pressure VOUT_DIV module.
The inverting input terminal of the comparator COMP is connected with the output end of biasing module BIAS, the comparator COMP's
Output end is connected with the input terminal of the reference voltage module, the comparator COMP, for receiving the biasing module BIAS
The reference voltage VREF of output, and reference voltage VSEL is generated in conjunction with the first feedback voltage V FB, in soft start-up process,
The output voltage of the reference voltage module is determined according to the low and high level of the reference voltage VSEL.
It should be noted that the current potential based on the VFB rises, in the current potential of the VREF during soft start
In the case where current potential always above the VFB, the reference voltage VSEL is low level, the comparator COMP, for selecting
The second feedback voltage V FB_CMP is selected to export to the end voltage VREF_SS of the reference voltage module.
Further, it should be noted that the reference voltage module is MOS switch.
The voltage at the end VREF_SS is equivalent to the second feedback voltage V FB_CMP.
It should be noted that the current potential based on the VFB rises, if the current potential of the VFB during soft start
When current potential higher than the reference voltage VREF, the reference voltage VSEL is high level, the comparator COMP, for selecting
Reference voltage VREF is exported to the end voltage VREF_SS of the reference voltage module.
Further, it should be noted that the voltage at the end VREF_SS is equivalent to the reference voltage VREF.
In the utility model embodiment, the output voltage partial pressure VOUT_DIV module generates the first feedback voltage V FB
With the second feedback voltage V FB_CMP, and the first feedback voltage V FB is inputted into the comparator COMP, second feedback
The current potential of voltage VFB_CMP is lower than the current potential of the first feedback voltage V FB, and the comparator COMP receives the biasing module
The reference voltage VREF of BIAS output, and reference voltage VSEL is generated in conjunction with the first feedback voltage V FB, in soft start-up process
In, the output voltage of the reference voltage module is determined according to the low and high level of the reference voltage VSEL.Therefore, this is practical new
Type embodiment in the case where realizing ensures that the soft starting circuit of switching power source chip normally start, saving switching power source chip at
This.
It further, as described in Figure 2, is a kind of configuration diagram of Switching Power Supply disclosed in the utility model embodiment,
The Switching Power Supply includes: SS (soft start) control circuit as shown in Figure 1, error amplifier ERROR_AMP, comparator PWM and function
The gate driving circuit of rate pipe.
The input terminal of the SS (soft start) control circuit is connected with output voltage VO UT, the output of the SS (soft start) control circuit
End is connected with the error amplifier ERROR_AMP, is used for outputting reference voltage VREF_SS and the first feedback voltage V FB.
It should be noted that the specific structure of the SS (soft start) control circuit is as follows:
The output end of the output voltage partial pressure VOUT_DIV module is connected with the non-inverting input terminal of the comparator COMP,
For generating the first feedback voltage V FB and the second feedback voltage V FB_CMP, and will be described in the first feedback voltage V FB input
The current potential of comparator COMP, the second feedback voltage V FB_CMP are lower than the current potential of the first feedback voltage V FB.
The inverting input terminal of the comparator COMP is connected with the output end of biasing module BIAS, the comparator COMP's
Output end is connected with the input terminal of the reference voltage module, the comparator COMP, for receiving the biasing module BIAS
The reference voltage VREF of output, and reference voltage VSEL, the reference voltage module are generated in conjunction with the first feedback voltage V FB
Output reference voltage VREF_SS.
Further, it should be noted that the first feedback voltage V FB that the output voltage partial pressure VOUT_DIV module generates
It is output voltage by output voltage partial pressure VOUT_DIV module generation with the second feedback voltage V FB_CMP.
The error amplifier ERROR_AMP receives reference voltage VREF_SS and the institute of the reference voltage module output
Output voltage partial pressure the first feedback voltage V of VOUT_DIV module FB is stated, and passes through the first feedback voltage V FB of amplification and reference voltage
The comparison voltage COMP that the error of VREF_SS generates.
The input terminal of the comparator PWM module is connected with the output end of the error amplifier ERROR_AMP, the ratio
Compared with the comparison voltage COMP for the output that the input terminal of device PWM module receives the error amplifier ERROR_AMP, and combine oblique
Slope offset voltage VSLOPE drives the gate driving circuit of the power tube.
The input terminal of the gate driving circuit of the power tube is connected with comparator PWM output end, the grid of the power tube
The output end and power tube M of pole driving circuitNGrid LSG and power tube MPGrid HSG be connected, driving switch power supply.
It should be noted that the output end of the gate driving circuit of the power tube and power tube MNGrid LSG and function
Rate pipe MPGrid HSG be connected, wherein power tube MNGrid LSG connection switch power supply to GND, power tube MPGrid
HSG connection switch power supply is to output voltage VO UT.
Further, switching power circuit further include: RC compensation network and the inductance L for storing and transmitting voltage.
It should be noted that the output end and comparator of the RC compensation network and the error amplifier ERROR_AMP
The input terminal of PWM is connected, for compensating resistance capacitance for switching power circuit.
It should be noted that the output voltage VO UT passes through resistance RLSystem and capacitor CLGround connection guarantees switch power supply
The stabilization on road.
Specific implementation process based on Switching Power Supply disclosed above, citing is illustrated here:
In BOOST Switching Power Supply, the SS (soft start) control circuit outputting reference voltage VREF_SS and the first feedback voltage
VFB, the error amplifier ERROR_AMP receive the reference voltage VREF_SS and first of the SS (soft start) control circuit output
Feedback voltage V FB, and the comparison voltage exported by the error of the first feedback voltage V FB of amplification and reference voltage VREF_SS
COMP, the input terminal of the comparator PWM module receive the comparison voltage of the output of the error amplifier ERROR_AMP
COMP, and the gate driving circuit for driving the power tube, the grid of the power tube are generated in conjunction with slope generation voltage VSLOPE
Pole driving circuit drives BOOST Switching Power Supply.
It should be noted that Switching Power Supply disclosed above can be not only BOOST step-up switching power supply, it can also be BUCK
Adjusting and voltage-reduction switch power supply or BUCK-BOOST lifting type Switching Power Supply etc..
In the utility model embodiment, the feedback of the SS (soft start) control circuit outputting reference voltage VREF_SS and first
Voltage VFB, the error amplifier ERROR_AMP receive the SS (soft start) control circuit output reference voltage VREF_SS and
First feedback voltage V FB, and it is electric compared with the error of reference voltage VREF_SS generates by the first feedback voltage V FB of amplification
Press COMP.The input terminal of the comparator PWM module receives the comparison voltage of the output of the error amplifier ERROR_AMP
COMP, and the gate driving circuit for driving the power tube is generated in conjunction with slope generation voltage VSLOPE.The grid of the power tube
Pole driving circuit driving switch power circuit.It therefore, can be in reality by a kind of switching power circuit disclosed by the utility model
In the case where now ensuring that the soft starting circuit of switching power source chip normally starts, switching power source chip cost is saved.
Based on the SS (soft start) control circuit of Switching Power Supply disclosed in above-mentioned the utility model embodiment, the utility model is implemented
A kind of flow diagram of the also corresponding soft start control method for disclosing Switching Power Supply of example is suitable for soft start as described in Figure 3
Control circuit, method includes the following steps:
Step S301: the output voltage partial pressure VOUT_DIV module control inputs the comparator COMP homophase input
The first feedback voltage V FB current potential at end.
In step S301, the second feedback voltage V FB_CMP's of the output voltage partial pressure VOUT_DIV module generation
Current potential is lower than the current potential of the first feedback voltage V FB.
It should be noted that the first feedback voltage V FB and second that the output voltage partial pressure VOUT_DIV module generates
Feedback voltage V FB_CMP is that output voltage VO UT is generated by the output voltage partial pressure VOUT_DIV module.
Step S302: the bias BIAS module is via the comparator COMP inverting input terminal to the comparator COMP
Input reference voltage VREF.
Step S303: the comparator COMP is generated based on the first feedback voltage V FB and reference voltage VREF
Reference voltage VSEL, and determine based on the low and high level of the reference voltage VSEL output voltage of the reference voltage module.
It should be noted that if the output voltage partial pressure VOUT_DIV module control inputs the same phase of comparator COMP
First feedback voltage V FB potential duration of input terminal rises, and inputs the comparator COMP anti-phase input in the BIAS module
In the case where current potential of the current potential of the reference voltage VREF at end always above the first feedback voltage V FB, the comparator COMP base
Reference voltage VSEL is generated in the first feedback voltage V FB and reference voltage VREF, and is based on the reference voltage
The low and high level of VSEL determines the output voltage of the reference voltage module, comprising:
It is low level that the comparator COMP is based on the first feedback voltage V FB and reference voltage VREF generation
Reference voltage VSEL determines output voltage VREF_SS of the second feedback voltage V FB_CMP as the reference voltage module.
Further, it should be noted that above-mentioned output voltage VREF_SS is equivalent to the second feedback voltage V FB_CMP.
It should be noted that if the output voltage partial pressure VOUT_DIV module control inputs the same phase of comparator COMP
First feedback voltage V FB potential duration of input terminal rises, and is more than that the BIAS module is defeated in the current potential of the first feedback voltage V FB
In the case where the current potential for entering the reference voltage VREF of the comparator COMP inverting input terminal, the comparator COMP is based on described
The first feedback voltage V FB and reference voltage VREF generates reference voltage VSEL, and the height based on the reference voltage VSEL
Low level determines the output voltage of the reference voltage module, comprising:
The comparator COMP generates high level based on the first feedback voltage V FB and reference voltage VREF
Reference voltage VSEL determines output voltage VREF_SS of the reference voltage VREF as the reference voltage module.
Further, it should be noted that above-mentioned output voltage VREF_SS is equivalent to reference voltage VREF.
Each step of the soft start control method of Switching Power Supply disclosed in above-mentioned the utility model embodiment is specifically former
Reason and implementation procedure, it is identical as the SS (soft start) control circuit of Switching Power Supply disclosed in above-mentioned the utility model embodiment, reference can be made to
Corresponding part, no longer goes to live in the household of one's in-laws on getting married here in the SS (soft start) control circuit of Switching Power Supply disclosed in above-mentioned the utility model embodiment
It states.
The utility model embodiment is in soft start-up process, the output voltage partial pressure VOUT_DIV module control input institute
The first feedback voltage V FB current potential of comparator COMP non-inverting input terminal is stated, the bias BIAS module is via the comparator
COMP inverting input terminal is based on first feedback to the comparator COMP input reference voltage VREF, the comparator COMP
The voltage VFB and reference voltage VREF generates reference voltage VSEL, and the low and high level based on the reference voltage VSEL is true
The output voltage of the fixed reference voltage module.It therefore, can be by a kind of switching power circuit disclosed by the utility model
In the case that realization ensures that the soft starting circuit of switching power source chip normally starts, switching power source chip is saved.
All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for system or
For system embodiment, since it is substantially similar to the method embodiment, so describing fairly simple, related place is referring to method
The part of embodiment illustrates.System and system embodiment described above is only schematical, wherein the conduct
The unit of separate part description may or may not be physically separated, component shown as a unit can be or
Person may not be physical unit, it can and it is in one place, or may be distributed over multiple network units.It can root
According to actual need that some or all of the modules therein is selected to achieve the purpose of the solution of this embodiment.Ordinary skill
Personnel can understand and implement without creative efforts.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of the utility model.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (7)
1. a kind of SS (soft start) control circuit of Switching Power Supply characterized by comprising output voltage divides VOUT_DIV module,
Comparator COMP, reference voltage module and biasing module BIAS；
The output end of the output voltage partial pressure VOUT_DIV module is connected with the non-inverting input terminal of the comparator COMP, is used for
The first feedback voltage V FB and the second feedback voltage V FB_CMP are generated, and the first feedback voltage V FB is inputted into the comparison
The current potential of device COMP, the second feedback voltage V FB_CMP are lower than the current potential of the first feedback voltage V FB；
The inverting input terminal of the comparator COMP is connected with the output end of biasing module BIAS, the output of the comparator COMP
End is connected with the input terminal of the reference voltage module, the comparator COMP, for receiving the biasing module BIAS output
Reference voltage VREF, and in conjunction with the first feedback voltage V FB generate reference voltage VSEL, in soft start-up process, according to
The low and high level of the reference voltage VSEL determines the output voltage of the reference voltage module.
2. circuit according to claim 1, which is characterized in that during soft start, based on the first feedback electricity
The current potential of VFB is pressed to rise, in the feelings of current potential of the current potential of the reference voltage VREF always above the first feedback voltage V FB
Under condition, the reference voltage VSEL is low level, the comparator COMP, for selecting the second feedback voltage V FB_CMP to institute
State the end the voltage VREF_SS output of reference voltage module.
3. circuit according to claim 1, which is characterized in that during soft start, based on the first feedback electricity
The current potential of VFB is pressed to rise, it is described if the current potential of the first feedback voltage V FB is higher than the current potential of the reference voltage VREF
Reference voltage VSEL is high level, the comparator COMP, for selecting reference voltage VREF to the reference voltage module
The output of the end voltage VREF_SS.
4. circuit according to claim 1,2 or 3, which is characterized in that the reference voltage module is MOS switch.
5. a kind of Switching Power Supply characterized by comprising switch power soft-start control of any of claims 1-4
Circuit processed, error amplifier ERROR_AMP, the gate driving circuit of comparator PWM and power tube；
The input terminal of the SS (soft start) control circuit is connected with output voltage VO UT, the output end of the SS (soft start) control circuit with
The error amplifier ERROR_AMP is connected, and is used for outputting reference voltage VREF_SS and the first feedback voltage V FB；
The error amplifier ERROR_AMP receives the reference voltage VREF_SS and first of the SS (soft start) control circuit output
Feedback voltage V FB, and the comparison voltage exported by the error of the first feedback voltage V FB of amplification and reference voltage VREF_SS
COMP；
The input terminal of the comparator PWM module is connected with the output end of the error amplifier ERROR_AMP, the comparator
The input terminal of PWM module receives the comparison voltage COMP of the output of the error amplifier ERROR_AMP, and combines slope compensation
Voltage VSLOPE generates the gate driving circuit for driving the power tube；
The input terminal of the gate driving circuit of the power tube is connected with comparator PWM output end, and the grid of the power tube drives
The output end and power tube M of dynamic circuitNGrid LSG and power tube MPGrid HSG be connected, driving switch power supply.
6. Switching Power Supply according to claim 5, which is characterized in that further include: RC compensation network；
The RC compensation network is connected with the input terminal of the output end of the error amplifier ERROR_AMP and comparator PWM, uses
In for Switching Power Supply compensate resistance capacitance.
7. Switching Power Supply according to claim 5, which is characterized in that the Switching Power Supply is BOOST Switching Power Supply.
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| CN201821562841.1U CN208971381U (en) | 2018-09-25 | 2018-09-25 | The SS (soft start) control circuit of Switching Power Supply |
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| CN201821562841.1U CN208971381U (en) | 2018-09-25 | 2018-09-25 | The SS (soft start) control circuit of Switching Power Supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245511A (en) * | 2018-09-25 | 2019-01-18 | 上海艾为电子技术股份有限公司 | The SS (soft start) control circuit and method of Switching Power Supply |
| CN110868229A (en) * | 2019-10-28 | 2020-03-06 | 西安空间无线电技术研究所 | Radio frequency front-end circuit broadband compensation method based on conjugate bipolar point |
-
2018
- 2018-09-25 CN CN201821562841.1U patent/CN208971381U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245511A (en) * | 2018-09-25 | 2019-01-18 | 上海艾为电子技术股份有限公司 | The SS (soft start) control circuit and method of Switching Power Supply |
| CN110868229A (en) * | 2019-10-28 | 2020-03-06 | 西安空间无线电技术研究所 | Radio frequency front-end circuit broadband compensation method based on conjugate bipolar point |
| CN110868229B (en) * | 2019-10-28 | 2021-04-13 | 西安空间无线电技术研究所 | Radio frequency front-end circuit broadband compensation method based on conjugate bipolar point |
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