CN113489321B - Control method and circuit for automatically adjusting output voltage ripple - Google Patents
Control method and circuit for automatically adjusting output voltage ripple Download PDFInfo
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- CN113489321B CN113489321B CN202110817467.5A CN202110817467A CN113489321B CN 113489321 B CN113489321 B CN 113489321B CN 202110817467 A CN202110817467 A CN 202110817467A CN 113489321 B CN113489321 B CN 113489321B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
Abstract
The invention relates to a control method and a circuit for automatically adjusting output voltage ripple. When the voltage topology circuit is in an off state due to the switch driving signal VGN output by the voltage-current control loop, the current control counting module CCT OFF The current I is sampled according to the received load SO Generating a sampling current I with the load SO Positively correlated current control count time T OFF The method comprises the steps of carrying out a first treatment on the surface of the After the current control counting time T passes OFF After that, the current control counting module CCT OFF The voltage-current control loop can be loaded with a current control counting pulse signal, and the voltage-current control loop outputs a switch driving signal VGN capable of driving the voltage topology circuit to be started according to the received current control counting pulse signal, so that the working frequency of the voltage topology circuit can be adjusted as required, and voltage ripple can be adjusted as required. The invention can adjust the working frequency according to the change of the load so as to achieve the purposes of adjusting the output ripple and reducing the output ripple, and has wide application range, safety and reliability.
Description
Technical Field
The present invention relates to a control method and a circuit, and more particularly, to a control method and a circuit for automatically adjusting output voltage ripple.
Background
Since the 21 st century, the integrated circuit industry was the most serious invention in the 21 st century, and its application covers all aspects of human life, along with the rapid development of technology. As one of the important components of integrated circuits, switching power supply technology has been rapidly developed. The switching power supply converter is widely applied to various portable consumer electronic products, computers, electronic devices, instruments, communication devices, household appliances and wearable intelligent electronic devices due to the advantages of high conversion efficiency, high response speed, low loss, small volume and the like. Along with the transformation from the traditional electric energy conversion technology to the energy-saving conversion technology, the global green surge brings forth requirements on the power industry, and is also a target pursued by the power industry. The power supply is an essential important component part of various electronic equipment, and the performance of the power supply is directly related to the safety and reliability indexes of the whole system, wherein the output voltage ripple is used as the performance index of the switching power supply and is a high-quality embodiment of the switching power supply, so that the power supply cannot be ignored in design.
The BOOST circuit is similar to the output voltage ripple of the BUCK-BOOST circuit, which is closely related to parameters such as capacitance, inductance, load current, input voltage, output voltage, etc. Parasitic resistance R of e.g. ceramic capacitor ESR The capacitance value of the ceramic capacitor can be controlled within a few mΩ in a small power condition, the influence on the output ripple is more obvious, and the parasitic resistance R of the ceramic capacitor and the ceramic capacitor is higher at a medium power condition ESR The effect on the output ripple is more pronounced. In addition, the output voltage ripple increases proportionally as the output load is larger while keeping other conditions unchanged, and especially in the case of heavy load, the output ripple even affects the circuit reliability.
In summary, how to adjust the output voltage ripple and ensure the performance stability of the power circuit is a current urgent problem to be solved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a control method and a circuit for automatically adjusting output voltage ripple, which can adjust working frequency according to load change so as to achieve the purposes of adjusting output ripple and reducing output ripple, and have wide application range, safety and reliability.
According to the technical scheme provided by the invention, the control method for automatically adjusting the output voltage ripple comprises a power circuit which can provide a required voltage for a load RL; the power supply circuit comprises a voltage topology circuit which is matched with an input power supply VIN and a voltage and current control loop which can adjust the working state of the voltage topology circuit, wherein the voltage and current control loop can load a switch driving signal VGN to the voltage topology circuit, and the working state of the voltage topology circuit can be adjusted through the switch driving signal VGN;
the system also comprises a current control counting module CCT which is connected with the voltage and current control loop in an adaptive manner OFF The current control counting module CCT OFF Receiving flow through negativeLoad sampling current I of load RL SO The method comprises the steps of carrying out a first treatment on the surface of the When the voltage topology circuit is in an off state due to the switch driving signal VGN output by the voltage-current control loop, the current control counting module CCT OFF The current I is sampled according to the received load SO Generating a sampling current I with the load SO Positively correlated current control count time T OFF ；
After the current control counting time T passes OFF After that, the current control counting module CCT OFF The voltage-current control loop can be loaded with a current control counting pulse signal, and the voltage-current control loop outputs a switch driving signal VGN capable of driving the voltage topology circuit to be started according to the received current control counting pulse signal so as to enable the working frequency of the voltage topology circuit to be adjusted as required, and voltage ripples can be adjusted as required through the adjusted working frequency.
Current control counting module CCT OFF And also at the same time receive reference current I b Current control counting module CCT OFF The current I is sampled according to the received load SO Generating a sampling current I with the load SO Positively correlated current control count time T OFF Is that
T OFF ＝m(I b -kI so )，I b -kI so ＞0
Where k, m are constant coefficient parameters.
The voltage topology circuit comprises a BOOST topology or a BUCK-BOOST topology.
When the voltage topology circuit is of a BOOST topology structure, the voltage topology circuit comprises an NMOS tube MN1, an inductor L1 and a diode D1, wherein one end of the inductor L1 is connected with the positive end of an input power source VIN, the negative end of the input power source VIN is grounded, the other end of the inductor L1 is connected with the anode end of the diode D1 and the drain end of the NMOS tube MN1, the source end of the NMOS tube MN1 is grounded, and the gate end of the NMOS tube MN1 is connected with the output end of a voltage and current control ring.
The cathode end of the diode D1 is connected with one end of the load RL and one end of the output capacitor Co, and the other end of the load RL and the other end of the output capacitor Co are grounded;
the voltage-current control loop comprises a comparator A1, a comparator A2 and a latch FF1, wherein the non-inverting terminal of the comparator A1 receives a reference voltage Vref, the inverting terminal of the comparator A1 is connected with one end of a resistor R1 and one end of a resistor R2, the other end of the resistor R2 is grounded, the other end of the resistor R1 is connected with the cathode terminal of a diode D1, the output terminal of the comparator A1 is connected with the non-inverting terminal of the comparator A2, the inverting terminal of the comparator A2 is connected with the source terminal of an NMOS tube MN1 and the anode terminal of the diode D1 through a current-checking voltage conversion circuit, the output terminal of the comparator A2 is connected with the reset terminal Rn of the latch FF1, the latch output terminal Q of the latch FF1 is connected with the gate terminal of the NMOS tube MN1, and the current control counting module CCT OFF The count output of (1) is connected to the set terminal Sn of latch FF 1.
When the comparison signal VR output from the comparator A2 to the reset terminal Rn of the latch FF1 is at a low level, the switch driving signal output from the latch output terminal Q of the latch FF1 is at a low level; current control counting module CCT OFF When the current control count pulse signal loaded to the set terminal Sn of the latch FF1 by the count output terminal of (a) is at a low level, the switch driving signal output through the latch output terminal Q of the latch FF1 is at a high level;
the latch output Q of the latch FF1 is also connected with the current control counter module CCT OFF Is connected to the reset terminal rst.
A control circuit for automatically adjusting output voltage ripple comprises a power supply circuit capable of providing a load RL with a required voltage; the power supply circuit comprises a voltage topology circuit which is matched with an input power supply VIN and a voltage and current control loop which can adjust the working state of the voltage topology circuit, wherein the voltage and current control loop can load a switch driving signal VGN to the voltage topology circuit, and the working state of the voltage topology circuit can be adjusted through the switch driving signal VGN;
the system also comprises a current control counting module CCT which is connected with the voltage and current control loop in an adaptive manner OFF The current control counting module CCT OFF Receiving a load sampling current I flowing through a load RL SO The method comprises the steps of carrying out a first treatment on the surface of the The switch driving signal VGN output by the voltage-current control loop enables the voltageWhen the topology circuit is in an off state, the current control counting module CCT OFF The current I is sampled according to the received load SO Generating a sampling current I with the load SO Positively correlated current control count time T OFF ；
After the current control counting time T passes OFF After that, the current control counting module CCT OFF The voltage-current control loop can be loaded with a current control counting pulse signal, and the voltage-current control loop outputs a switch driving signal VGN capable of driving the voltage topology circuit to be started according to the received current control counting pulse signal so as to enable the working frequency of the voltage topology circuit to be adjusted as required, and voltage ripples can be adjusted as required through the adjusted working frequency.
Current control counting module CCT OFF And also at the same time receive reference current I b Current control counting module CCT OFF The current I is sampled according to the received load SO Generating a sampling current I with the load SO Positively correlated current control count time T OFF Is that
T OFF ＝m(I b -kI so )，I b -kI so ＞0
Where k, m are constant coefficient parameters.
The voltage topology circuit comprises a BOOST topology or a BUCK-BOOST topology.
When the voltage topology circuit is of a BOOST topology structure, the voltage topology circuit comprises an NMOS tube MN1, an inductor L1 and a diode D1, wherein one end of the inductor L1 is connected with the positive end of an input power source VIN, the negative end of the input power source VIN is grounded, the other end of the inductor L1 is connected with the anode end of the diode D1 and the drain end of the NMOS tube MN1, the source end of the NMOS tube MN1 is grounded, and the gate end of the NMOS tube MN1 is connected with the output end of a voltage and current control ring.
The invention has the advantages that: when the voltage topology circuit is in an off state due to the switch driving signal VGN output by the voltage-current control loop, the current control counting module CCT OFF The current I is sampled according to the received load SO Generating and said load miningSample current I SO Positively correlated current control count time T OFF ；
After the current control counting time T passes OFF After that, the current control counting module CCT OFF The voltage-current control loop can be loaded with a current control counting pulse signal, and the voltage-current control loop outputs a switch driving signal VGN capable of driving the voltage topology circuit to be started according to the received current control counting pulse signal so as to enable the working frequency of the voltage topology circuit to be adjusted as required, and the working frequency of the circuit can be adjusted according to the change of a load by adjusting the working frequency of the voltage topology circuit so as to achieve the purposes of adjusting output ripple and reducing the output ripple.
Drawings
Fig. 1 is a schematic circuit diagram of a BOOST topology of the voltage topology of the present invention.
Detailed Description
The invention will be further described with reference to the following specific drawings and examples.
In order to achieve the purpose of adjusting output ripple and reducing output ripple according to the change of load RL, the invention comprises a power circuit capable of providing required voltage for load RL; the power supply circuit comprises a voltage topology circuit which is matched with an input power supply VIN and a voltage and current control loop which can adjust the working state of the voltage topology circuit, wherein the voltage and current control loop can load a switch driving signal VGN to the voltage topology circuit, and the working state of the voltage topology circuit can be adjusted through the switch driving signal VGN;
the system also comprises a current control counting module CCT which is connected with the voltage and current control loop in an adaptive manner OFF The current control counting module CCT OFF Receiving a load sampling current I flowing through a load RL SO The method comprises the steps of carrying out a first treatment on the surface of the When the voltage topology circuit is in an off state due to the switch driving signal VGN output by the voltage-current control loop, the current control counting module CCT OFF The current I is sampled according to the received load SO Generating a sampling current I with the load SO Positively correlated current control count time T OFF ；
After the current control counting time T passes OFF After that, the current control counting module CCT OFF The voltage-current control loop can be loaded with a current control counting pulse signal, and the voltage-current control loop outputs a switch driving signal VGN capable of driving the voltage topology circuit to be started according to the received current control counting pulse signal so as to enable the working frequency of the voltage topology circuit to be adjusted as required, and voltage ripples can be adjusted as required through the adjusted working frequency.
Specifically, the load RL can be selected according to actual needs, the working voltage of the load RL can be provided by the power circuit, and the load sampling current I flowing through the load RL can be obtained after the voltage is loaded on the load RL SO The load samples current I SO CCT capable of being controlled by current OFF Received. In the embodiment of the invention, the power supply circuit generally comprises a voltage topology circuit, the voltage of the input power supply VIN can be increased or decreased through the voltage topology circuit, the voltage topology circuit comprises a BOOST topology structure or a BUCK-BOOST topology structure, when the voltage topology circuit adopts the BOOST topology structure, the whole power supply circuit can form a common BOOST power supply circuit, and when the voltage topology circuit adopts the BUCK-BOOST topology structure, the whole power supply circuit can form the common BUCK-BOOST power supply circuit, which is particularly well known to those skilled in the art and is not repeated herein.
In the implementation, the power supply circuit is either a BOOST power supply circuit or a BUCK-BOOST power supply circuit, and the power supply circuit further comprises a voltage-current control loop besides the voltage topology circuit, wherein the specific working process of the voltage-current control loop and the voltage topology circuit and the specific matching working process of the voltage-current control loop and the voltage topology circuit are consistent with the prior art, and are well known to those skilled in the art, and are not repeated herein. The voltage topology circuit has a corresponding working frequency, that is, the voltage topology circuit can be alternately in a working state and an off state, and the specific situation of the voltage topology circuit in the working state or the off state is consistent with the existing situation, which is well known to those skilled in the art, and is not repeated here. The voltage topology circuit is in a working state or an off state and can be controlled by a switch driving signal VGN output by the voltage and current control loop, and the process of generating the switch driving signal VGN by the voltage and current control loop and controlling the working state of the voltage topology circuit by utilizing the generated switch driving signal VGN is consistent with the prior art and is not repeated here.
In order to adapt to the condition of the load RL and achieve the purpose of reducing voltage ripple, in the embodiment of the invention, the voltage-current control loop and the current control counting module CCT OFF The current control counting module CCT is connected in an adapting way when different from the existing BOOST power supply circuit OFF It is necessary to receive a load sampling current I flowing through a load RL SO Current control counting module CCT OFF Sampling current I according to the received load SO Can generate and sample current I with the load SO Positively correlated current control count time T OFF 。
In particular, the current control counting module CCT is used for controlling the voltage topology circuit to be in an off state if and only if the switch driving signal VGN output by the voltage-current control loop OFF Sampling current I according to the received load SO Can generate a current control count time T OFF . Obtaining the current control counting time T OFF After that, the current control counting module CCT OFF Timing, i.e. when said current control count time T has elapsed OFF After that, the current control counting module CCT OFF The voltage-current control loop can be loaded with a current control counting pulse signal, and can output a switch driving signal VGN capable of driving the voltage topology circuit to be started according to the received current control counting pulse signal, at the moment, the voltage topology circuit can be in a working state according to the switch driving signal VGN, so that the working frequency of the voltage topology circuit can be adjusted as required, and the voltage ripple can be adjusted as required according to the adjusted working frequency.
Further, the current control counting module CCT OFF And also at the same time receive reference current I b Current control counting module CCT OFF According to the connectionThe received load sample current I SO Generating a sampling current I with the load SO Positively correlated current control count time T OFF Is that
T OFF ＝m(I b -kI so )，I b -kI so ＞0
Where k, m are constant coefficient parameters.
In the embodiment of the invention, the reference current I b The reference current I is related to the working frequency of the power circuit when no load exists b The size of (2) can be specifically selected according to actual needs, and is well known in the art, and will not be described herein. The constant coefficient parameters k and m can be specifically selected according to actual needs.
As shown in fig. 1, when the voltage topology circuit is of a BOOST topology structure, the voltage topology circuit includes an NMOS tube MN1, an inductor L1, and a diode D1, wherein one end of the inductor L1 is connected to the positive end of the input power source VIN, the negative end of the input power source VIN is grounded, the other end of the inductor L1 is connected to the anode end of the diode D1 and the drain end of the NMOS tube MN1, the source end of the NMOS tube MN1 is grounded, and the gate end of the NMOS tube MN1 is connected to the output end of the voltage-current control loop.
The cathode end of the diode D1 is connected with one end of the load RL and one end of the output capacitor Co, and the other end of the load RL and the other end of the output capacitor Co are grounded;
the voltage-current control loop comprises a comparator A1, a comparator A2 and a latch FF1, wherein the non-inverting terminal of the comparator A1 receives a reference voltage Vref, the inverting terminal of the comparator A1 is connected with one end of a resistor R1 and one end of a resistor R2, the other end of the resistor R2 is grounded, the other end of the resistor R1 is connected with the cathode terminal of a diode D1, the output terminal of the comparator A1 is connected with the non-inverting terminal of the comparator A2, the inverting terminal of the comparator A2 is connected with the source terminal of an NMOS tube MN1 and the anode terminal of the diode D1 through a current-checking voltage conversion circuit, the output terminal of the comparator A2 is connected with the reset terminal Rn of the latch FF1, the latch output terminal Q of the latch FF1 is connected with the gate terminal of the NMOS tube MN1, and the current control counting module CCT OFF The count output of (1) is connected to the set terminal Sn of latch FF 1.
In fig. 1, the resistor Resr is an equivalent parasitic resistance of the output capacitor Co. In the embodiment of the present invention, when the comparison signal VR output by the comparator A2 to the reset terminal Rn of the latch FF1 is at a low level, the switch driving signal output through the latch output terminal Q of the latch FF1 is at a low level; current control counting module CCT OFF When the current control count pulse signal loaded to the set terminal Sn of the latch FF1 by the count output terminal of (a) is at a low level, the switch driving signal output through the latch output terminal Q of the latch FF1 is at a high level;
the latch output Q of the latch FF1 is also connected with the current control counter module CCT OFF Is connected to the reset terminal rst.
In specific implementation, the resistor R1 and the resistor R2 can obtain a divided voltage signal, that is, the inverting terminal of the comparator A1 can obtain a divided voltage VFB, the non-inverting terminal of the comparator A1 is connected with the reference voltage Vref, and the specific size of the reference voltage Vref can be selected according to needs, which is well known to those skilled in the art, and will not be repeated here. The latch output terminal Q of the latch FF1 controls the gate voltage and current control count module CCT of the NMOS transistor NM1 OFF Is provided for the reset signal rst. When the NMOS tube NM1 is disconnected, the current control counting module CCT OFF The counting is started, and when the NMOS tube NM1 is conducted, the current control counting module CCT OFF In a reset state.
The output end of the comparator A1 can output a voltage comparison value Vc, and the non-inverting end of the comparator A2 receives the voltage comparison value Vc. The inverting terminal of the comparator A2 is connected with the drain terminal of the NMOS tube MN1, the anode terminal of the diode D1 and the inductor L1 through a current-checking voltage converting circuit (i.e. CTV in FIG. 1), and the current flowing through the NMOS tube MN1 can be converted into a voltage signal, i.e. the voltage V applied to the inverting terminal of the comparator A2 SEN The output terminal of the comparator A2 is connected to the reset terminal Rn of the latch FF1, i.e. the comparison signal VR output by the comparator A2 can be loaded to the reset terminal Rn of the latch FF 1. Latch FF1 may be an SR latch. The current-detecting voltage converting circuit may specifically take the form of a conventional circuit, which is well known to those skilled in the art, and will not be described herein.
For the power circuit of fig. 1, under normal operation, when the driving NMOS MN1 is turned on, the current flowing through the driving NMOS MN1 is an inductor current, and when the driving NMOS MN1 is turned on, the voltage across the inductor L1 is VIN, the inductor current linearly increases, and as the current increases, the voltage V obtained by the current-checking voltage conversion circuit SEN The voltage is also increased in equal proportion, when the voltage V SEN Voltage is equal to voltage V C When the voltage of the comparison signal VR output by the comparator A2 immediately becomes low level, the latch FF1 is reset, that is, the switch driving signal VGN output through the output terminal Q of the latch FF1 is low level, and at this time, the NMOS transistor MN1 is in an off state, that is, the voltage topology circuit is also in an off state; meanwhile, the current control counting module CCT OFF Sampling current I according to the received load SO Can obtain the current control counting time T OFF Current control counting module CCT OFF According to the obtained current, controlling the counting time T OFF Timing, current control count time T OFF Reference is made to the above description for details.
Counting time T from current control OFF The specific calculation mode of the power supply circuit can know the working frequency T of the whole power supply circuit s The method comprises the following steps:
the specific calculation mode of the conduction duty ratio D is consistent with the existing one, and is well known to those skilled in the art, and will not be described here again. As can be seen from the above expression, the current I is sampled with the load SO Is increased by the current control count time T OFF Reduction of the source circuit operating frequency T s And also decreases.
Under normal operating conditions, the output ripple of the circuit is composed of two parts: the specific calculation modes of the ripple wave generated by the output capacitor Co and the ripple wave generated by the parasitic resistance Resr are as follows:
wherein Co is the capacitance value of the output capacitor Co, R ESR Is the resistance of the parasitic resistance. I load Current flowing through the load, and load sampling current I SO There is a linear ratio (sampling ratio), load current I laod And load-like current I SO The linear ratio between the two can be selected according to the needs, and is well known in the art, and will not be described here. As can be seen from the above formula, when the load current I load Increase, output capacitance C o Self-generated ripple and parasitic resistance R esr The ripple generation increases; at the same time, from the above-mentioned operating frequency T s As can be seen from the expression of (a), when the load current I load Increase, the current control count time T OFF Reducing the corresponding circuit operating frequency T s Also, at this time, the ripple is reduced. Therefore, when the load increases, the circuit operating frequency T s The output ripple is automatically adjusted by reducing the output ripple and reducing the ripple when the output ripple and the output ripple are in a mutual offset relation.
In summary, a control circuit capable of automatically adjusting output voltage ripple is obtained, comprising a power supply circuit capable of providing a required voltage for a load RL; the power supply circuit comprises a voltage topology circuit which is matched with an input power supply VIN and a voltage and current control loop which can adjust the working state of the voltage topology circuit, wherein the voltage and current control loop can load a switch driving signal VGN to the voltage topology circuit, and the working state of the voltage topology circuit can be adjusted through the switch driving signal VGN;
the system also comprises a current control counting module CCT which is connected with the voltage and current control loop in an adaptive manner OFF The current control counting module CCT OFF Receiving a load sampling current I flowing through a load RL SO The method comprises the steps of carrying out a first treatment on the surface of the When the voltage topology circuit is in an off state due to the switch driving signal VGN output by the voltage-current control loop, the current control counting module CCT OFF The current I is sampled according to the received load SO Generating a sampling current I with the load SO Positively correlated current control count time T OFF ；
After passing through the electricityFlow control count time T OFF After that, the current control counting module CCT OFF The voltage-current control loop can be loaded with a current control counting pulse signal, and the voltage-current control loop outputs a switch driving signal VGN capable of driving the voltage topology circuit to be started according to the received current control counting pulse signal so as to enable the working frequency of the voltage topology circuit to be adjusted as required, and voltage ripples can be adjusted as required through the adjusted working frequency.
In the embodiment of the invention, a voltage topology circuit, a voltage and current control loop and a current control counting module CCT OFF The specific operation and the matching state of the above-mentioned components are consistent with the above description, and specific reference should be made to the above description, which is not repeated here.
Claims (8)
1. A control method for automatically adjusting output voltage ripple includes a power circuit capable of providing a load RL with a desired voltage; the power supply circuit comprises a voltage topology circuit which is matched with an input power supply VIN and a voltage and current control loop which can adjust the working state of the voltage topology circuit, wherein the voltage and current control loop can load a switch driving signal VGN to the voltage topology circuit, and the working state of the voltage topology circuit can be adjusted through the switch driving signal VGN; the method is characterized in that:
the system also comprises a current control counting module CCT which is adaptively connected with the voltage and current control loop OFF The current control counting module CCT OFF Receiving a load sampling current I flowing through a load RL SO The method comprises the steps of carrying out a first treatment on the surface of the When the voltage topology circuit is in an off state due to the switch driving signal VGN output by the voltage-current control loop, the current control counting module CCT OFF Sampling current I according to the received load SO Generating a sampling current I with the load SO Positively correlated current control count time T OFF ；
After the current control counting time T passes OFF After that, the current control counting module CCT OFF The voltage-current control loop can be loaded with a current control count pulse signal, and the voltage-current control loop can output a driving voltage topology according to the received current control count pulse signalThe circuit is started to drive the signal VGN by a switch so as to enable the working frequency of the voltage topology circuit to be adjusted as required, and the output voltage ripple can be adjusted as required through the adjusted working frequency;
current control counting module CCT OFF And also at the same time receive reference current I b Current control counting module CCT OFF Sampling current I according to the received load SO Generating a sampling current I with the load SO Positively correlated current control count time T OFF Is that
T OFF ＝m(I b -kI so )，I b -kI so ＞0
Where k, m are constant coefficient parameters.
2. The method for controlling the automatic regulation of output voltage ripple according to claim 1, wherein: the voltage topology circuit comprises a BOOST topology or a BUCK-BOOST topology.
3. The method for controlling the automatic regulation of output voltage ripple according to claim 2, wherein: when the voltage topology circuit is of a BOOST topology structure, the voltage topology circuit comprises an NMOS tube MN1, an inductor L1 and a diode D1, wherein one end of the inductor L1 is connected with the positive end of an input power source VIN, the negative end of the input power source VIN is grounded, the other end of the inductor L1 is connected with the anode end of the diode D1 and the drain end of the NMOS tube MN1, the source end of the NMOS tube MN1 is grounded, and the gate end of the NMOS tube MN1 is connected with the output end of a voltage and current control ring.
4. The method for controlling the automatic regulation of output voltage ripple according to claim 3, wherein: the cathode end of the diode D1 is connected with one end of the load RL and one end of the output capacitor Co, and the other end of the load RL and the other end of the output capacitor Co are grounded;
the voltage-current control loop comprises a comparator A1, a comparator A2 and a latch FF1, wherein the non-inverting terminal of the comparator A1 receives the reference voltage Vref, and the inverting terminal of the comparator A1 is electrically connected with the output terminal of the latch FF1One end of a resistor R1 and one end of a resistor R2 are connected, the other end of the resistor R2 is grounded, the other end of the resistor R1 is connected with the cathode end of a diode D1, the output end of a comparator A1 is connected with the same-phase end of the comparator A2, the inverting end of the comparator A2 is connected with the drain end of an NMOS tube MN1 and the anode end of the diode D1 through a current detection voltage conversion circuit, the output end of the comparator A2 is connected with the reset end Rn of a latch FF1, the latch output end Q of the latch FF1 is connected with the gate end of the NMOS tube MN1, and a current control counting module CCT OFF The count output of (1) is connected to the set terminal Sn of latch FF 1.
5. The method for controlling the automatic regulation of output voltage ripple as recited in claim 4, wherein: when the comparison signal VR output from the comparator A2 to the reset terminal Rn of the latch FF1 is at a low level, the switch driving signal VGN output from the latch output terminal Q of the latch FF1 is at a low level; current control counting module CCT OFF When the current control count pulse signal loaded to the set terminal Sn of the latch FF1 by the count output terminal of (a) is at a low level, the switch driving signal VGN output through the latch output terminal Q of the latch FF1 is at a high level;
the latch output Q of the latch FF1 is also connected with the current control counter module CCT OFF Is connected to the reset terminal rst.
6. A control circuit for automatically adjusting output voltage ripple comprises a power supply circuit capable of providing a load RL with a required voltage; the power supply circuit comprises a voltage topology circuit which is matched with an input power supply VIN and a voltage and current control loop which can adjust the working state of the voltage topology circuit, wherein the voltage and current control loop can load a switch driving signal VGN to the voltage topology circuit, and the working state of the voltage topology circuit can be adjusted through the switch driving signal VGN; the method is characterized in that:
the system also comprises a current control counting module CCT which is adaptively connected with the voltage and current control loop OFF The current control counting module CCT OFF Receiving a load sampling current I flowing through a load RL SO The method comprises the steps of carrying out a first treatment on the surface of the The switch driving signal VGN output by the voltage-current control loop enables the voltageWhen the topology circuit is in an off state, the current control counting module CCT OFF Sampling current I according to the received load SO Generating a sampling current I with the load SO Positively correlated current control count time T OFF ；
After the current control counting time T passes OFF After that, the current control counting module CCT OFF The voltage-current control loop outputs a switch driving signal VGN capable of driving the voltage topology circuit to be started according to the received current control counting pulse signal, so that the working frequency of the voltage topology circuit can be adjusted as required, and the output voltage ripple can be adjusted as required through the adjusted working frequency;
current control counting module CCT OFF And also at the same time receive reference current I b Current control counting module CCT OFF Sampling current I according to the received load SO Generating a sampling current I with the load SO Positively correlated current control count time T OFF Is that
T OFF ＝m(I b -kI so )，I b -kI so ＞0
Where k, m are constant coefficient parameters.
7. The control circuit for automatically adjusting output voltage ripple as recited in claim 6, wherein: the voltage topology circuit comprises a BOOST topology or a BUCK-BOOST topology.
8. The control circuit for automatically adjusting output voltage ripple as recited in claim 7, wherein: when the voltage topology circuit is of a BOOST topology structure, the voltage topology circuit comprises an NMOS tube MN1, an inductor L1 and a diode D1, wherein one end of the inductor L1 is connected with the positive end of an input power source VIN, the negative end of the input power source VIN is grounded, the other end of the inductor L1 is connected with the anode end of the diode D1 and the drain end of the NMOS tube MN1, the source end of the NMOS tube MN1 is grounded, and the gate end of the NMOS tube MN1 is connected with the output end of a voltage and current control ring.
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