CN105407601A - Switch power supply PWM circuit - Google Patents
Switch power supply PWM circuit Download PDFInfo
- Publication number
- CN105407601A CN105407601A CN201510805843.3A CN201510805843A CN105407601A CN 105407601 A CN105407601 A CN 105407601A CN 201510805843 A CN201510805843 A CN 201510805843A CN 105407601 A CN105407601 A CN 105407601A
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- CN
- China
- Prior art keywords
- power supply
- module
- pwm
- comparison module
- switching power
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Abstract
The invention discloses a switch power supply PWM (Pulse Width Modulation) circuit. An error magnification module uses a bipolar transconductance operational amplifier; due to composition, the bipolar transconductance operational amplifier has the characteristics of high output impedance, wide transmission band bandwidth and good high-frequency characteristics, so that the application range of the error magnification module is expanded; the input stage of a PWM comparison module is of a rail-to-rail structure; by using the rail-to-rail structure, when the voltage of a circuit power supply is lowered, the influence of noise on the circuit is not increased; the maximum input oscillation amplitude is obtained; a differential amplification module is arranged on the PWM comparison module, so that a PWM comparer obtains high precision; the PWM comparer has the characteristics of high speed and high precision through response time of the PWM comparison module; and the application value is high.
Description
Technical field
The present invention relates to and belong to LED circuit field, be specifically related to a kind of Switching Power Supply PWM circuit.
Background technology
Power supply is the heart of electronic equipment, does not have all electronic equipments of power supply normally to work, so people are to the increasing of electronic product demand, has also promoted the development of power management products.In power management products, Switching Power Supply power-efficient reaches 70% ~ 95%, is described as energy-efficient power supply, obtains unprecedented development in recent years.Current Switching Power Supply PWM circuit also exists the problem that circuit is complicated and the response time is long.
Summary of the invention
The object of the present invention is to provide a kind of Switching Power Supply PWM circuit.
For achieving the above object, the invention provides following technical scheme: a kind of Switching Power Supply PWM circuit, described Switching Power Supply PWM circuit comprises error amplification module, PWM comparison module and PWMLogic module, described error amplification module is connected with PWM comparison module, the difference of the reference voltage of the output feedback voltage after Voltage loop process and power supply chip inside is amplified by described error amplification module, produce an error amplification signal, error amplification signal and ramp signal compare by described PWM comparison module, the duty ratio of regulation output pulse, thus regulation output magnitude of voltage, described PWM comparison module also with PWMLogic model calling, described PWMLogic module comes unlatching and the shutoff of control switch pipe by exporting driving pulse.
Preferably, what described error amplification module adopted is ambipolar operational transconductance amplifier.
Preferably, described ambipolar operational transconductance amplifier comprises a differential pair by a symmetric trsanscondutance amplifier and three current mirrors form.
Preferably, the input stage of described PWM comparison module is rail-to-rail structure, jointly forms Complementary input structure differential pair structure particular by PMOS and NMOS tube.
Preferably, described PWM comparison module is provided with differential amplification module.
Preferably, the response time of described PWM comparison module is 5.2-5.4ns.
The beneficial effect of above technical scheme is adopted to be: to the invention provides a kind of Switching Power Supply PWM circuit, what described error amplification module adopted is ambipolar operational transconductance amplifier, it is high that the composition of described ambipolar operational transconductance amplifier makes it have output impedance, the feature that passband band is wide and high frequency characteristics is good, thus expand the scope of application of error amplification module, the input stage of described PWM comparison module is rail-to-rail structure, described rail-to-rail structure can when circuit power voltage reduces, do not increase the impact of noise on circuit, and obtain the maximum input amplitude of oscillation, described PWM comparison module is provided with differential amplification module, PWM comparator can be made to obtain higher precision, the response time of described PWM comparison module, PWM comparator is made to have the characteristic of high-speed, high precision, there is very high using value.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of embodiments of the invention.
Fig. 2 is the circuit diagram of error amplification module.
Embodiment
The technological means realized for making the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the present invention further.
embodiment:
A kind of Switching Power Supply PWM circuit, described Switching Power Supply PWM circuit comprises error amplification module, PWM comparison module and PWMLogic module, described error amplification module is connected with PWM comparison module, the difference of the reference voltage of the output feedback voltage after Voltage loop process and power supply chip inside is amplified by described error amplification module, produce an error amplification signal, error amplification signal and ramp signal compare by described PWM comparison module, the duty ratio of regulation output pulse, thus regulation output magnitude of voltage, described PWM comparison module also with PWMLogic model calling, described PWMLogic module comes unlatching and the shutoff of control switch pipe by exporting driving pulse.
What described error amplification module adopted is ambipolar operational transconductance amplifier, described ambipolar operational transconductance amplifier comprises a differential pair by a symmetric trsanscondutance amplifier and three current mirrors form, the input stage of described PWM comparison module is rail-to-rail structure, Complementary input structure differential pair structure is jointly formed particular by PMOS and NMOS tube, described PWM comparison module is provided with differential amplification module, and the response time of described PWM comparison module is 5.3ns.
The operation principle of error amplification module: during the work of error amplification module, V
in1input is the output feedack voltage V through source follower step-down
fb, V
in2input is internal reference voltage V
ref, and V
ref=3V, remains unchanged, current source I
biastail current is provided for differential pair by the current mirror of M6, M7 and M8 composition.Output current I
outto load capacitance C
lcharging, output error amplification voltage signal V
e.
The invention provides a kind of Switching Power Supply PWM circuit, what described error amplification module adopted is ambipolar operational transconductance amplifier, it is high that the composition of described ambipolar operational transconductance amplifier makes it have output impedance, the feature that passband band is wide and high frequency characteristics is good, thus expand the scope of application of error amplification module, the input stage of described PWM comparison module is rail-to-rail structure, described rail-to-rail structure can when circuit power voltage reduces, do not increase the impact of noise on circuit, and obtain the maximum input amplitude of oscillation, described PWM comparison module is provided with differential amplification module, PWM comparator can be made to obtain higher precision, the response time of described PWM comparison module, PWM comparator is made to have the characteristic of high-speed, high precision, there is very high using value.
As known by the technical knowledge, the present invention can be realized by other the embodiment not departing from its Spirit Essence or essential feature.Therefore, above-mentioned disclosed embodiment, with regard to each side, all just illustrates, is not only.Within the scope of the present invention all or be all included in the invention being equal to the change in scope of the present invention.
Claims (6)
1. a Switching Power Supply PWM circuit, it is characterized in that, described Switching Power Supply PWM circuit comprises error amplification module, PWM comparison module and PWMLogic module, described error amplification module is connected with PWM comparison module, the difference of the reference voltage of the output feedback voltage after Voltage loop process and power supply chip inside is amplified by described error amplification module, produce an error amplification signal, error amplification signal and ramp signal compare by described PWM comparison module, the duty ratio of regulation output pulse, thus regulation output magnitude of voltage, described PWM comparison module also with PWMLogic model calling, described PWMLogic module comes unlatching and the shutoff of control switch pipe by exporting driving pulse.
2. a kind of Switching Power Supply PWM circuit according to claim 1, is characterized in that: what described error amplification module adopted is ambipolar operational transconductance amplifier.
3. a kind of Switching Power Supply PWM circuit according to claim 2, is characterized in that: described ambipolar operational transconductance amplifier comprises a differential pair by a symmetric trsanscondutance amplifier and three current mirrors form.
4. a kind of Switching Power Supply PWM circuit according to claim 1, it is characterized in that: the input stage of described PWM comparison module is rail-to-rail structure, described rail-to-rail structure is the Complementary input structure differential pair structure jointly consisted of PMOS and NMOS tube.
5. a kind of Switching Power Supply PWM circuit according to claim 1, is characterized in that: described PWM comparison module is provided with differential amplification module.
6. according to claim 5 a kind of Switching Power Supply PWM circuit, it is characterized in that: the response time of described PWM comparison module is 5.2-5.4ns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510805843.3A CN105407601A (en) | 2015-11-20 | 2015-11-20 | Switch power supply PWM circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510805843.3A CN105407601A (en) | 2015-11-20 | 2015-11-20 | Switch power supply PWM circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105407601A true CN105407601A (en) | 2016-03-16 |
Family
ID=55472776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510805843.3A Pending CN105407601A (en) | 2015-11-20 | 2015-11-20 | Switch power supply PWM circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105407601A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841240A (en) * | 2010-04-12 | 2010-09-22 | 无锡中星微电子有限公司 | Power supply converter and error amplifier |
| US20140266085A1 (en) * | 2013-03-15 | 2014-09-18 | Dialog Semiconductor Gmbh | Control Method of High Efficient Buck-Boost Switching Regulator |
-
2015
- 2015-11-20 CN CN201510805843.3A patent/CN105407601A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841240A (en) * | 2010-04-12 | 2010-09-22 | 无锡中星微电子有限公司 | Power supply converter and error amplifier |
| US20140266085A1 (en) * | 2013-03-15 | 2014-09-18 | Dialog Semiconductor Gmbh | Control Method of High Efficient Buck-Boost Switching Regulator |
Non-Patent Citations (1)
| Title |
|---|
| 司明: "一种开关电源PWM控制电路设计", 《中国优秀硕士学位论文全文数据库》 * |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160316 |
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| RJ01 | Rejection of invention patent application after publication |