CN106160464B - Reduce the power-supply system of output ripple - Google Patents

Reduce the power-supply system of output ripple Download PDF

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CN106160464B
CN106160464B CN201510134286.7A CN201510134286A CN106160464B CN 106160464 B CN106160464 B CN 106160464B CN 201510134286 A CN201510134286 A CN 201510134286A CN 106160464 B CN106160464 B CN 106160464B
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charge
voltage
circuit
signal
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CN106160464A (en
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樊茂
朱小荣
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Spreadtrum Communications Shanghai Co Ltd
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Spreadtrum Communications Shanghai Co Ltd
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Abstract

The present invention relates to electronic technology fields, and in particular to a kind of power-supply system for reducing output ripple.Including BUCK converter, including, it is provided with the operating circuit of energy-storage travelling wave tube, is switched between the charge and discharge mode can under the action of pulse-width signal, to export first voltage;Control circuit, in one generated by clock unit clock pulse signal, voltage feedback signal, generate pulse-width signal under the action of current detection signal;Charge pump circuit includes regulating circuit, for first voltage to be transformed to negative voltage;Control electrical appliances for electric charge pump is connect with clock unit, for generating switch control signal;Under the action of clock unit, operating circuit is under charge mode with regulating circuit or operating circuit is under discharge mode with regulating circuit.BUCK converter of the present invention and charge pump circuit share same clock source, realize synchronous charging or synchronous discharge, can reduce output ripple voltage, improve the performance of system.

Description

Reduce the power-supply system of output ripple
Technical field
The present invention relates to electronic technology fields, and in particular to a kind of power-supply system.
Background technique
For using battery powered portable electronic product, it is often necessary to which power-supply system provides generating positive and negative voltage, existing There is the power-supply system of technology that one high input voltage is dropped to output voltage after lower voltage, output electricity by BUCK converter It presses while being converted by charge pump circuit to obtain stable negative voltage output.Charge pump is using capacitor as energy-storage travelling wave tube A kind of Switching Power Supply, inside the charge and discharge of capacitor are controlled by control switch pipe array, realize voltage conversion, characteristic base Between linear voltage regulator and inductance type Switching Power Supply, efficiency with higher and relatively simple peripheral circuit are needing to bear It is widely used in the system of power supply power supply, in conjunction with the power system circuit figure of Fig. 1 and the charge and discharge timing of Fig. 2 to Fig. 4 Figure the energy storage of inductive element and releases energy and capacitive as can be seen that since BUCK converter is there are the on and off of MOSFET The factors such as the charge and discharge of element can usually generate biggish ripple voltage, and due to electric charge transfer factor in charge pump circuit It can cause ripple, the interference meeting of ripple voltage is so that the biggish noise of system appearance, influences the performance of system.
Summary of the invention
The object of the present invention is to provide a kind of power-supply systems for reducing output ripple, solve the above technical problem;
Technical problem solved by the invention can be realized using following technical scheme:
Reduce the power-supply system of output ripple, wherein including,
BUCK converter, the BUCK converter include,
It is provided with the operating circuit of energy-storage travelling wave tube, in charge mode and discharge mode under the action of a pulse-width signal Between switch, to export a first voltage;
Control circuit, in one generated by clock unit clock pulse signal, a sampling is from the voltage of the first voltage The pulse-width signal is generated under the action of feedback signal, a current detection signal;
Charge pump circuit, the charge pump circuit include,
It is provided with the regulating circuit of storage capacitor, for the first voltage to be transformed to a negative voltage, the pressure regulation electricity Road is by the way that voltage conversion is realized in switching between charge mode and discharge mode under one group of switch control signal acts on;
Control electrical appliances for electric charge pump is connect with the clock unit, for generating the switch control signal;
Under the action of the clock unit, the operating circuit is under charge mode with the regulating circuit or institute It states operating circuit and the regulating circuit is under discharge mode.
The power-supply system of reduction output ripple of the invention, the regulating circuit include,
One Input voltage terminal is connect with the first voltage;
One output voltage terminal, for exporting the negative voltage;
First switch branch is connected to the Input voltage terminal and one first and crosses between node;
Second switch branch is connected to described first and crosses between node and ground terminal;
Third switching branches are connected to the output voltage terminal and one second and cross between node;
4th switching branches are connected to described second and cross between node and ground terminal;
The first switch branch, the second switch branch, the third switching branches and the 4th switching branches Control terminal connect respectively with the switch control signal;
The storage capacitor is connected to described first node and described second that crosses and crosses between node;
The regulating circuit is when charge mode, and the first switch branch and the 4th switching branches conducting are described Second switch branch and the third switching branches disconnect, and the Input voltage terminal charges to the storage capacitor;
The regulating circuit is when discharge mode, and the second switch branch and third switching branches conducting are described First switch branch and the 4th switching branches disconnect, and discharge from the storage capacitor both ends to the output voltage terminal.
The power-supply system of reduction output ripple of the invention, further includes an output capacitance, is connected to the output voltage terminal Between ground terminal.
The power-supply system of reduction output ripple of the invention, the operating circuit include,
Charge control branch is connected to an input terminal and one and crosses between node;
Charge and discharge branch is connected to described cross between node and an output end;
Control of discharge branch is connected to described cross between node and ground terminal;
The energy-storage travelling wave tube is series at the charge and discharge branch road;
The operating circuit is when charge mode, and the charge control branch and charge and discharge branch conducting are described to put Electric control branch disconnects, and the electric current of the input terminal input charges to the energy-storage travelling wave tube;
The operating circuit is when discharge mode, and the control of discharge branch and charge and discharge branch conducting are described to fill Electric control branch disconnects, and the energy-storage travelling wave tube discharges to the output end.
The power-supply system of reduction output ripple of the invention, when charge control branch described in the operating circuit is connected, First switch branch described in the regulating circuit and the 4th switching branches conducting;And/or described in the operating circuit When control of discharge branch is connected, second switch branch described in the regulating circuit and third switching branches conducting.
The power-supply system of reduction output ripple of the invention, one first PMOS tube of the first switch branch road series connection, institute Second switch branch one first NMOS tube of road series connection is stated, one second NMOS tube of connecting in the third switching branches, the described 4th It connects in switching branches a third NMOS tube.
The power-supply system of reduction output ripple of the invention, the control circuit include,
One error amplifier obtains an error and puts for being compared to a reference voltage with the voltage feedback signal Big signal;
One comparator generates one and compares for being compared to the error amplification signal with the current detection signal Signal;
One PWM modulator, the PWM modulator connect the clock pulse signal, for according to the comparison signal and The clock pulse signal generates the pulse-width signal.
The power-supply system of reduction output ripple of the invention, one second PMOS tube of the charge control branch road series connection;Institute State control of discharge branch one the 4th NMOS tube of road series connection.
The power-supply system of reduction output ripple of the invention, connects negative between the output end and the output voltage terminal It carries.
The utility model has the advantages that due to using the technology described above, the present invention is by sharing BUCK converter with charge pump circuit Same clock source realizes synchronous charging or synchronous discharge, can reduce output ripple voltage, improve the performance of system.
Detailed description of the invention
The power system structure figure that the BUCK converter and charge pump of Fig. 1 prior art are constituted;
Fig. 2 is the charge and discharge timing diagram of BUCK converter;
Fig. 3 is the charge and discharge timing diagram of charge pump;
Fig. 4 is the charge and discharge timing diagram of the BUCK converter of the prior art and the power-supply system of charge pump composition;
Fig. 5 is BUCK converter of the invention and the power system structure figure that charge pump is constituted;
Fig. 6 is the charge and discharge timing diagram of the power-supply system of BUCK converter of the invention and charge pump composition;
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art without creative labor it is obtained it is all its His embodiment, shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase Mutually combination.
The present invention will be further explained below with reference to the attached drawings and specific examples, but not as the limitation of the invention.
Referring to Figure 5, reduce the power-supply system of output ripple, wherein including,
BUCK converter, BUCK converter include,
It is provided with the operating circuit of energy-storage travelling wave tube, in charge mode and discharge mode under the action of a pulse-width signal Between switch, to export a first voltage VDD2;
Control circuit, by one generated by clock unit 5 clock pulse signal, a sampling is from the voltage of first voltage VDD2 Pulse-width signal is generated under the action of feedback signal Vfb, a current detection signal;
Charge pump circuit, charge pump circuit include,
Be provided with the regulating circuit of storage capacitor, first voltage VDD2 be transformed to a negative voltage VSS, the regulating circuit in Voltage conversion is realized in switching between charge mode and discharge mode under one group of switch control signal effect;
Control electrical appliances for electric charge pump 12, connect with clock pulse signal, for generating switch control signal;
Under the action of clock unit, operating circuit works asynchronously under charge mode with regulating circuit, or in electric discharge It works asynchronously under mode.
Output ripple can be reduced by improving switching frequency in the prior art, but high switching frequency can improve switch damage Consumption, electromagnetic interference and the stability for reducing system, output ripple can also be reduced by improving filter capacitor, improve filter however, increasing Wave capacitor will increase the settling time of charge pump, and the present invention innovatively makes BUCK converter and negative charge pump by same a period of time Clock system, switch motion is synchronous, and two circuits are charged and discharged mutually coordinated.
The power-supply system of reduction output ripple of the invention, regulating circuit include,
One Input voltage terminal is connect with first voltage VDD2;
One output voltage terminal, for exporting negative voltage VSS;
First switch branch is connected to Input voltage terminal and one first and crosses between node Lx1;
Second switch branch is connected to first and crosses between node Lx1 and ground terminal GND;
Third switching branches are connected to output voltage terminal and one second and cross between node Lx2;
4th switching branches are connected to second and cross between node Lx2 and ground terminal GND;
First switch branch, second switch branch, third switching branches and the 4th switching branches control terminal respectively with open Close control signal connection;
Storage capacitor is connected to the first node Lx1 and second that crosses and crosses between node Lx2;
Regulating circuit is when charge mode, first switch branch and the conducting of the 4th switching branches, second switch branch and the Three switching branches disconnect, and Input voltage terminal charges to storage capacitor C1;
Regulating circuit is when discharge mode, second switch branch and the conducting of third switching branches, first switch branch and the Four switching branches disconnect, and discharge from the both ends storage capacitor C1 to output voltage terminal.
The power-supply system of reduction output ripple of the invention, control electrical appliances for electric charge pump 12 may include,
Clock signal generating circuit is connect with clock pulse signal, for generating the non-overlapping clock signal of two-way reverse phase;
Level shifting circuit is connect with clock signal, for generating switch control signal.
When due to regulating circuit work, first switch branch, second switch branch, third switching branches, the 4th switch branch Road cannot simultaneously turn on and end, so the function to guarantee switching branches is real by generating the non-overlapping clock signal of reverse phase It is existing.
It may include other necessary functional modules inside control electrical appliances for electric charge pump 12 or those skilled in the art institute be ripe Other schemes known realize that this will not be repeated here.
The power-supply system of reduction output ripple of the invention, first switch branch road series connection one first PMOS tube Mp1, second Connect one first NMOS tube Mn1 in switching branches, and connect one second NMOS tube Mn3 in third switching branches, the 4th switching branches One third NMOS tube Mn2 of upper series connection.
The power-supply system of reduction output ripple of the invention, further includes an output capacitance C2, be connected to output voltage terminal and Between ground terminal GND.Regulating circuit discharges when discharge mode, from the both ends storage capacitor C1 to output capacitance C2.
The power-supply system of reduction output ripple of the invention, operating circuit may include,
Charge control branch is connected to an input terminal VDD and one and crosses between node Lx;
Charge and discharge branch is connected to and crosses between node Lx and an output end VDD2;
Control of discharge branch is connected to and crosses between node Lx and ground terminal GND;
Energy-storage travelling wave tube L is series at charge and discharge branch road;
For operating circuit when charge mode, switching device group controls charge control branch and the conducting of charge and discharge branch, and controls Control of discharge branch processed disconnects, and the electric current for inputting input terminal VDD charges to energy-storage travelling wave tube L;
For operating circuit when discharge mode, switching device group controls control of discharge branch and the conducting of charge and discharge branch, and controls Charge control branch processed disconnects, and energy-storage travelling wave tube L is made to discharge output end VDD2.
The power-supply system of reduction output ripple of the invention, in operating circuit when the conducting of charge control branch, regulating circuit Middle first switch branch and the conducting of the 4th switching branches;And/or in operating circuit when the conducting of control of discharge branch, in regulating circuit Second switch branch and the conducting of third switching branches.
The power-supply system of reduction output ripple of the invention, control circuit may include,
One error amplifier 6 obtains a mistake for being compared to a reference voltage Vref with voltage feedback signal Vfb Poor amplified signal;
One comparator 2 generates a comparison signal for being compared to error amplification signal with current detection signal;
One PWM modulator 1, PWM modulator connect clock signal, for generating pulsewidth according to comparison signal and clock signal Modulated signal.
Control circuit further comprises current sampling circuit 3 and zero cross detection circuit 7, and concrete methods of realizing is not done herein It repeats.
The power-supply system of reduction output ripple of the invention, one second PMOS tube Mp of charge control branch road series connection;Electric discharge Connect one the 4th NMOS tube Mn on controlling brancher.
The power-supply system of reduction output ripple of the invention, connects load between first voltage VDD2 and negative voltage VSS Rload。
It can be seen that the first PMOS tube Mp1 and third NMOS tube in conjunction with the circuit diagram of Fig. 5 and the charge and discharge timing diagram of Fig. 6 Mn2 conducting, the first NMOS tube Mn1 and the second NMOS tube Mn3 are disconnected, when Input voltage terminal charges to storage capacitor C1, charging control The second PMOS tube Mp of branch road processed is also switched on, and control of discharge branch the 4th NMOS tube Mn of road is disconnected, the synchronous work of BUCK converter Make in charge mode;And when the first NMOS tube Mn1 and the second NMOS tube Mn3 conducting, the first PMOS tube Mp1 and third NMOS tube When Mn2 is disconnected, when the output capacitance C2 from the both ends storage capacitor C1 to output voltage terminal discharges, control of discharge branch road the 4th NMOS tube Mn is also switched on, and charge control branch the second PMOS tube Mp of road is disconnected, and BUCK converter works asynchronously in discharge mode. It can be seen that the present invention by the way that BUCK converter and charge pump circuit are shared same clock referring to the charge and discharge timing diagram of Fig. 6 Source realizes synchronous charging or synchronous discharge, can reduce output ripple voltage, improve the performance of system.
The foregoing is merely preferred embodiments of the present invention, are not intended to limit embodiments of the present invention and protection model It encloses, to those skilled in the art, should can appreciate that all with made by description of the invention and diagramatic content Equivalent replacement and obviously change obtained scheme, should all be included within the scope of the present invention.

Claims (8)

1. reducing the power-supply system of output ripple, which is characterized in that including,
BUCK converter, the BUCK converter include,
It is provided with the operating circuit of energy-storage travelling wave tube, under the action of a pulse-width signal between the charge and discharge mode can Switching, to export a first voltage;
Control circuit, in one generated by clock unit clock pulse signal, a sampling is from the Voltage Feedback of the first voltage The pulse-width signal is generated under the action of signal, a current detection signal;
Charge pump circuit, the charge pump circuit include,
It is provided with the regulating circuit of storage capacitor, for the first voltage to be transformed to a negative voltage, the regulating circuit is logical Voltage conversion is realized in switching between charge mode and discharge mode under excessively one group of switch control signal effect;
Control electrical appliances for electric charge pump is connect with the clock unit, for generating the switch control signal;
Under the action of the clock unit, the operating circuit is under charge mode with the regulating circuit or the work Make circuit and the regulating circuit is under discharge mode;
One load of connection between the voltage output end of the regulating circuit, and the output end of the operating circuit.
2. the power-supply system according to claim 1 for reducing output ripple, which is characterized in that the regulating circuit includes,
One Input voltage terminal is connect with the first voltage;
The output voltage terminal, for exporting the negative voltage;
First switch branch is connected to the Input voltage terminal and one first and crosses between node;
Second switch branch is connected to described first and crosses between node and ground terminal;
Third switching branches are connected to the output voltage terminal and one second and cross between node;
4th switching branches are connected to described second and cross between node and ground terminal;
The control of the first switch branch, the second switch branch, the third switching branches and the 4th switching branches End processed is connect with the switch control signal respectively;
The storage capacitor is connected to described first node and described second that crosses and crosses between node;
The regulating circuit is when charge mode, the first switch branch and the 4th switching branches conducting, and described second Switching branches and the third switching branches disconnect, and the Input voltage terminal charges to the storage capacitor;
The regulating circuit is when discharge mode, the second switch branch and third switching branches conducting, and described first Switching branches and the 4th switching branches disconnect, and discharge from the storage capacitor both ends to the output voltage terminal.
3. the power-supply system according to claim 2 for reducing output ripple, which is characterized in that it further include an output capacitance, It is connected between the output voltage terminal and ground terminal.
4. the power-supply system according to claim 2 for reducing output ripple, which is characterized in that the operating circuit includes,
Charge control branch is connected to an input terminal and one and crosses between node;
Charge and discharge branch is connected to described cross between node and the output end;
Control of discharge branch is connected to described cross between node and ground terminal;
The energy-storage travelling wave tube is series at the charge and discharge branch road;
The operating circuit is when charge mode, the charge control branch and charge and discharge branch conducting, the electric discharge control Branch processed disconnects, and the electric current of the input terminal input charges to the energy-storage travelling wave tube;
The operating circuit is when discharge mode, the control of discharge branch and charge and discharge branch conducting, the charging control Branch processed disconnects, and the energy-storage travelling wave tube discharges to the output end.
5. the power-supply system according to claim 4 for reducing output ripple, which is characterized in that described in the operating circuit When charge control branch is connected, first switch branch described in the regulating circuit and the 4th switching branches conducting;And/or When control of discharge branch described in the operating circuit is connected, second switch branch described in the regulating circuit and the third Switching branches conducting.
6. the power-supply system according to claim 2 for reducing output ripple, which is characterized in that the first switch branch road It connects one first PMOS tube, one first NMOS tube of the second switch branch road series connection connects one in the third switching branches Second NMOS tube, a third NMOS tube of connecting in the 4th switching branches.
7. the power-supply system according to claim 1 for reducing output ripple, which is characterized in that the control circuit includes,
One error amplifier obtains error amplification letter for being compared to a reference voltage with the voltage feedback signal Number;
One comparator generates a comparison signal for being compared to the error amplification signal with the current detection signal;
One PWM modulator, the PWM modulator connect the clock pulse signal, for according to the comparison signal and described Clock pulse signal generates the pulse-width signal.
8. the power-supply system according to claim 4 for reducing output ripple, which is characterized in that the charge control branch road It connects one second PMOS tube;One the 4th NMOS tube of the control of discharge branch road series connection.
CN201510134286.7A 2015-03-25 2015-03-25 Reduce the power-supply system of output ripple Active CN106160464B (en)

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TWI633733B (en) * 2017-04-18 2018-08-21 立積電子股份有限公司 Power supply and method for operating a power supply
TWI664798B (en) * 2017-11-20 2019-07-01 國立成功大學 Power supply system
CN108471236B (en) * 2018-04-20 2020-06-09 晶晨半导体(上海)股份有限公司 Power supply system with stable loop
US11239758B2 (en) 2018-04-20 2022-02-01 Amlogic (Shanghai) Co., Ltd. Power supply system with stable loop
CN108964428B (en) * 2018-06-27 2020-07-31 晶晨半导体(上海)股份有限公司 Power supply system with ripple suppression function
US10965215B2 (en) * 2019-08-15 2021-03-30 Microchip Technology Incorporated Constant on-time buck converter with calibrated ripple injection having improved light load transient response and reduced output capacitor size

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CN104065263A (en) * 2013-03-22 2014-09-24 株式会社东芝 Voltage Conversion Circuit And Switching Control Circuit

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