CN211791279U - Step-down direct-current voltage conversion circuit with main and auxiliary structures - Google Patents

Step-down direct-current voltage conversion circuit with main and auxiliary structures Download PDF

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CN211791279U
CN211791279U CN202020168554.3U CN202020168554U CN211791279U CN 211791279 U CN211791279 U CN 211791279U CN 202020168554 U CN202020168554 U CN 202020168554U CN 211791279 U CN211791279 U CN 211791279U
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latch
signal
voltage
module
circuit
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曾衍瀚
植浩昌
周威
杨敬慈
林奕涵
李锦韬
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Guangzhou University
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Guangzhou University
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Abstract

The utility model provides a be applied to the step-down type direct current voltage converting circuit who contains main and auxiliary structure among the circuit system, be used for with circuit system's input voltage step-down is specific voltage and exports the load, and it includes: the low-voltage difference linear voltage stabilizing module outputs current to the load simultaneously with the main structure-the switching power supply module in a high-load mode, and outputs instantaneous current with the same trend as the sudden change trend of the load in a preset transient mode, so that a circuit system can achieve a rapid steady state.

Description

Step-down direct-current voltage conversion circuit with main and auxiliary structures
Technical Field
The utility model relates to an integrated circuit field especially relates to a step-down type direct current voltage conversion circuit who contains main and auxiliary structure.
Background
With the popularization of portable devices such as smartwatches and smartphones, there is an urgent need for high-performance power management converters such as DC-DC converters that can efficiently provide large load currents. Current-mode DC-DC converters are becoming more and more popular because of their advantages of simple compensation, relatively high bandwidth, internal current protection, etc.
However, transient response is limited due to low bandwidth and large compensation capacitance. In addition, since the power consumption is fixed, the efficiency of the DC-DC converter is not always better at light load than at high load, and the typical existing fast transient method is to increase the loop gain or the slew rate of the amplifier during the transient. However, in the prior art, when an unstable response occurs, the transient voltage change is large, and the stability of the DC-DC converter is low.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model provides a step-down type direct current voltage conversion circuit who contains main and auxiliary structure has the advantage of quick stable state.
In a first aspect, an embodiment of the present invention provides a step-down dc voltage converting circuit with main and auxiliary structures, which is applied to a circuit system, and is used to step down input voltage of the circuit system to a specific voltage and output the voltage to a load, including: the low-dropout linear voltage regulator comprises a switching power supply module, a low-dropout linear voltage regulator module, a voltage reference module and a clock module;
the switching power supply module is connected with the load and used for providing load current for the load;
the output end of the low-dropout linear voltage stabilizing module is connected with the switching power supply module, the output end of the low-dropout linear voltage stabilizing module does not output current in a preset conventional mode, the current of a part of the load current higher than a first preset threshold value is output in a preset high-load mode, the instantaneous current with the same trend as the sudden change trend of the load is output in a preset transient mode, and all the load current is output in a preset low-load mode;
the output end of the voltage reference module is respectively connected with the reference voltage input end of the low dropout linear voltage stabilizing module and the reference voltage input end of the voltage reference module, and the voltage reference module is used for generating a reference voltage V with a preset voltage valueREF；
And the output end of the clock module is respectively connected with the clock signal input end of the low dropout linear voltage stabilizing module and the clock signal input end of the voltage reference module, and the clock module is used for respectively providing the required clock signal CLK for the low dropout linear voltage stabilizing module and the voltage reference module.
Compared with the prior art, the utility model discloses beneficial effect as follows:
the step-down dc voltage converting circuit applied to a circuit system for stepping down an input voltage of the circuit system to a specific voltage and outputting the voltage to a load includes: a main structure for outputting current to a load, a switching power supply module, an auxiliary structure, a low-voltage difference linear voltage stabilizing module, and a reference voltage V for generating a preset voltage valueREFThe voltage reference module and the clock module are used for respectively providing the clock signals CLK required by the low-voltage difference linear voltage stabilizing module and the switching power supply module, the auxiliary structure-the low-voltage difference linear voltage stabilizing module and the main structure-the switching power supply module output current to the load at the same time in a high-load mode, and output instant current with the same trend as the sudden change trend of the load in a preset transient mode, so that a circuit system can reach a rapid steady state, and all load current is output in a preset low-load mode, thereby avoiding the power waste caused by partial current flowing into the ground when the main structure outputs current to the load in the low-load modeThe area cost is low for adding external devices.
As an improvement of the scheme, the switching power supply module comprises a first resistor R1A second resistor R2A first capacitor COUTEquivalent series resistance ESR, first inductance L0A power tube M1, a power tube M2, a first power supply, a first operational amplifier, an RC series circuit, a first comparator, and a third resistor RSENThe circuit comprises a first SR latch, a first AND gate, a dead zone generation and driving circuit, a slope compensation circuit and a current sensing circuit;
the first resistor R1First terminal of and the second resistor R2Is connected to the first terminal of the second resistor R2The second terminal of the first resistor R is grounded, and the first resistor R is connected with the ground1Second terminal of, the first capacitor COUTThe first terminal of (1), the first inductance L0Are connected to the input of the load, the first capacitor COUTWith a first end of the equivalent series resistance ESR, the second end of the equivalent series resistance ESR being connected to ground, the first inductance L0The source of M1 and the drain of M2 are commonly connected, the source of M2 is grounded, the drain of M1 is connected with the first power supply, the non-inverting input terminal of the first operational amplifier inputs the reference voltage V through the reference voltage input terminal of the switching power supply moduleREFThe inverting input terminal of the first operational amplifier and the second resistor R2The output end of the first operational amplifier is connected with the inverting input end of the first comparator and the first end of the RC series circuit, the second end of the RC series circuit is grounded, and the non-inverting input end of the first comparator and the third resistor R are connected with each otherSENIs connected to the first terminal of the third resistor RSENThe second end of the first comparator is grounded, the output end of the first comparator is connected with the R end of the first SR latch, the S end of the first SR latch inputs a clock signal CLK through the clock signal input end of the switching power supply module, the Q end of the first SR latch is connected with the first input end of the first AND gate, and the second input end of the first AND gate inputs the first input end of the first AND gateThe output end of the first AND gate is connected with the input end of the dead zone generating and driving circuit, the first output end of the dead zone generating and driving circuit is connected with the grid electrode of M1, the second output end of the dead zone generating and driving circuit is connected with the grid electrode of M2, and the input end of the slope compensation circuit is connected with the first resistor R1The output end of the slope compensation circuit and the output end of the current sensing circuit are connected with the third resistor RSENThe input end of the current sensing circuit is connected with the drain electrode of the M2; the first signal LightLoad is generated by the low dropout linear regulator module, and is asserted high when the circuit system is in the low load mode.
As an improvement of the scheme, the output end of the low dropout linear voltage stabilizing module and the first resistor R1And the feedback voltage input end of the low dropout linear regulator module is connected with the first resistor R1Is connected with the first end of the low-dropout linear voltage stabilizing module, and the switch node V of the low-dropout linear voltage stabilizing moduleSWConnected to the drain of M2.
As an improvement of the above scheme, the low dropout linear regulator module comprises a switch array and a cooperative sensing circuit;
the switch array comprises 32 current units, the signal input end of the switch array is connected with the signal output end of the cooperative induction circuit, and the output end of the switch array is the output end of the low-dropout linear voltage stabilizing module;
the feedback voltage input end of the cooperative induction circuit is the feedback voltage input end of the low-dropout linear voltage stabilizing module, and the switch node V of the cooperative induction circuitSWIs a switching node V of the low dropout linear regulator moduleSWThe circuit system is used for detecting and latching the operation mode of the circuit system and outputting corresponding signals to the switch array according to the detection result; wherein the operating mode comprises: the normal mode, the high load mode, the transient mode, and the low load mode.
As an improvement of the above solution, the cooperative sensing circuit includes: the shift register comprises a plurality of comparators, a second SR latch, a third SR latch, a fourth SR latch, a fifth SR latch, a sixth SR latch, a D latch and a shift register;
the output ends of the comparators are connected with the second SR latch, the third SR latch, the fourth SR latch, the fifth SR latch, the sixth SR latch and the D latch, and the comparators are used for receiving signals from the feedback voltage input end and the switch node VSWThe received signal outputs a corresponding signal through an output end, wherein the corresponding signal comprises a second signal Under _ V when the output voltage of the low-dropout linear voltage stabilizing module is smaller than a preset lower threshold reference voltageLAnd when the output voltage of the low dropout linear voltage stabilizing module is greater than the preset upper threshold reference voltage, the corresponding third signal Over _ VHA corresponding fourth signal Over _ EN when the load current is greater than the first preset threshold value and a corresponding fifth signal Light _ EN when the load current is less than a second preset threshold value;
the second SR latch is used for latching the output state of the low-dropout linear voltage stabilizing module and outputting a corresponding signal to the shift register;
the third SR latch and the fourth SR latch are used for latching whether the circuit system enters the low-load mode or not and outputting corresponding signals to the shift register;
the fifth SR latch and the sixth SR latch are used for latching the proceeding stage of the transient mode of the circuit system and outputting corresponding signals to the shift register;
the D latch is used for latching whether the circuit system enters the high-load mode or not and outputting a corresponding signal to the shift register;
the shift register is used for outputting a 32-bit level signal for controlling the on or off of a current unit in the switch array according to a received signal; the 32-bit level signal includes a lowest bit level signal and a highest bit level signal, and when the lowest bit level signal is low, the output end of the low dropout linear regulator module does not output current.
As an improvement of the above scheme, the cooperative sensing circuit further includes a first or gate, a second and gate, a third and gate, a fourth and gate, a second operational amplifier, an RC integration circuit, and a second power supply;
the inverting input end of the second operational amplifier is connected with the feedback voltage input end, the non-inverting input end of the second operational amplifier is connected with the output end of the RC integrating circuit, the input end of the RC integrating circuit is connected with the feedback voltage input end, the output end of the second operational amplifier is connected with the R end of the fifth SR latch, the output end of the second operational amplifier is connected with the R end of the sixth SR latch after being inverted, and the S end of the fifth SR latch is used for receiving the second signal Under _ VLThe Q terminal of the fifth SR latch outputs an undershoot transient signal EN _ Lt, and the S terminal of the sixth SR latch is configured to receive the third signal Over _ VHThe Q terminal of the sixth SR latch outputs an overshoot transient signal EN _ Ht, the Q terminal of the fifth SR latch and the Q terminal of the sixth SR latch further input the first input terminal and the second input terminal of the first or gate, respectively, the output terminal of the first or gate outputs a transient mode signal Tran _ EN, the first input terminal of the second and gate is configured to receive the overshoot transient signal EN _ Ht, the second input terminal of the second and gate is configured to receive the inverted signal of the highest bit level signal, the output terminal of the second and gate is connected to the S terminal of the second SR latch, the R terminal of the second SR latch is configured to receive the inverted signal of the highest bit level signal, the Q terminal of the second SR latch outputs a CTRL signal, the first input terminal of the third and gate is configured to receive the transient mode signal Tran _ EN, and the second input terminal of the third and gate is configured to receive the inverted signal of the highest bit level signal, the output end of the third AND gate is connected with the R end of the third SR latch, the S end of the third SR latch is used for receiving the inverted signal of the highest bit level signal, and the Q end of the third SR latch is connected with the third SR latchThe first end of the fourth AND gate is connected, the second end of the fourth AND gate is used for inputting the fifth signal Light _ EN, the output end of the fourth AND gate is connected with the S end of the fourth SR latch, the R end of the fourth SR latch is used for inputting the transient mode signal Tran _ EN, the Q end of the fourth SR latch is used for outputting the first signal LightLoad corresponding to the low-load mode, the D end of the D latch is connected with the second power supply, the clock signal input end Clk of the D latch is used for receiving the fourth signal Over _ EN, the Reset end of the D latch is used for receiving the transient mode signal Tran _ EN, and the Q end of the D latch outputs the sixth signal OverLoad corresponding to the high-load mode.
As an improvement of the above scheme, the cooperative sensing circuit further includes a charge pump and a level shifter;
the input end of the charge pump is connected with an external power supply, and the output end of the charge pump is connected with the level shifter;
one input end of the level shifter is connected with one output end of the shift register, one output end of the level shifter is connected with one current unit, and the output end of the level shifter outputs a current unit control signal EN.
As an improvement of the above solution, the first signal LightLoad is further output through a control terminal of the cooperative sensing circuit, the control terminal is connected to a gate of a power transistor M3, and a source of the power transistor M3 is connected to the switch node VSWThe input ends of the current sensing circuits are connected together, and the drain electrode of the power tube M3 is connected with the first inductor L0Is connected to the first end of the first housing.
As an improvement of the above solution, one of the current units includes a single-pole double-throw switch and two NMOS transistors, and the normally-open end and the normally-closed end of the single-pole double-throw switch are respectively connected to the gates of the two NMOS transistors.
As an improvement of the scheme, the clock module is of a double-loop feedback structure.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required for the embodiments will be briefly described below, and obviously, the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a step-down dc voltage conversion circuit having a main and auxiliary structure according to an embodiment of the present invention;
fig. 2 is a timing diagram illustrating mode switching of a circuit system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a part of a cooperative sensing circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a part of the low dropout linear regulator module provided in the embodiment of the present invention;
fig. 5 is a schematic structural diagram of a current unit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, a first embodiment of the present invention provides a step-down dc voltage converting circuit having a main and auxiliary structure, which is applied to a circuit system for stepping down an input voltage of the circuit system to a specific voltage and outputting the specific voltage to a load, and includes: the low-dropout linear voltage regulator comprises a switching power supply module, a low-dropout linear voltage regulator module, a voltage reference module and a clock module;
the switching power supply module is connected with the load and used for providing load current for the load;
in an embodiment of the present invention, the switching power supply module is a main structure of the step-down dc voltage converting circuit.
The output end of the low-dropout linear voltage stabilizing module is connected with the switching power supply module, the output end of the low-dropout linear voltage stabilizing module does not output current in a preset conventional mode, the current of a part of the load current higher than a first preset threshold value is output in a preset high-load mode, the instantaneous current with the same trend as the sudden change trend of the load is output in a preset transient mode, and all the load current is output in a preset low-load mode;
in the embodiment of the present invention, the normal mode is when the load current ILOADThe current is less than or equal to a first preset threshold value and greater than a second preset threshold value, the circuit system already exits the mode from the transient mode after the last load transient change, at the moment, the low-dropout linear voltage stabilizing module is turned off, and the circuit system provides all current for the load by the switching power supply module; the high load mode is a mode in which the circuit system is located when the load current is greater than a first preset threshold, the switching power supply module outputs the maximum output current of the switching power supply module at the moment, the low dropout linear voltage stabilizing module provides the current exceeding the part, and the high load mode and the low dropout linear voltage stabilizing module simultaneously output the current to the load; the transient mode is a mode in which a circuit system is located when the load current jumps, the auxiliary low-voltage linear voltage regulator outputs an instantaneous current with the same trend as the sudden change of the load, and a part of charges are supplemented or released to achieve the purpose of quick transient; the low load mode is a mode in which the circuit system is located when the load current is smaller than a second preset threshold, and if the switching power supply module continues to provide all current for the load at this time, a part of the current flows into the ground, which causes power waste, so that the low dropout linear regulator module sends a control signal to enable the switching power supply module to enter a sleep state and provide all the load current by the low dropout linear regulator module, please refer to fig. 2, which is a timing diagram for switching the modes of the circuit system provided by the embodiment of the present invention.
In the embodiment of the present invention, the first preset threshold may be set to 2A, and the second preset threshold may be set to 100 mA.
The output end of the voltage reference module is respectively connected with the base of the low-dropout linear voltage stabilizing moduleA reference voltage input terminal connected with the reference voltage input terminal of the voltage reference module for generating a reference voltage V with a preset voltage valueREF；
In an embodiment of the present invention, after the step-down dc voltage converting circuit is powered on, the voltage reference module is first started to generate the reference voltage VREFAnd converting the voltage into the modules to provide current, wherein the voltage reference module uses a band gap reference circuit structure.
And the output end of the clock module is respectively connected with the clock signal input end of the low dropout linear voltage stabilizing module and the clock signal input end of the voltage reference module, and the clock module is used for respectively providing the required clock signal CLK for the low dropout linear voltage stabilizing module and the voltage reference module.
In the embodiment of the present invention, the clock module may provide clock signals CLK with different frequencies and different duty ratios for the low dropout linear regulator module and the voltage reference module, respectively; it should be noted that the clock module is connected to the cooperative sensing circuit of the low dropout linear regulator module, so that the cooperative sensing circuit operates stably, and the principle is as follows: the cooperative sensing circuit is provided with a digital circuit unit, and a clock signal output by the clock module is a necessary condition for stable operation of the digital circuit unit.
In an embodiment of the present invention, be applied to in the circuit system step-down type direct current voltage conversion circuit for with the input voltage step-down of circuit system is specific voltage and exports the load, and it includes: a main structure for outputting current to a load, a switching power supply module, an auxiliary structure, a low-voltage difference linear voltage stabilizing module, and a reference voltage V for generating a preset voltage valueREFThe auxiliary structure-the low-dropout linear voltage stabilizing module and the main structure-the switching power supply module output current to the load at the same time in a high-load mode, and output instantaneous current with the same trend as the sudden change trend of the load in a preset transient modeThe circuit system can reach a rapid stable state, all load currents are output in a preset low-load mode, the situation that partial currents flow into the ground when a main structure outputs the currents to a load in the low-load mode to cause power waste can be avoided, the voltage reduction type direct current voltage conversion circuit with the main and auxiliary structures is used, no external device needs to be added, and the area cost is low.
In an alternative embodiment, the switching power supply module comprises a first resistor R1A second resistor R2A first capacitor COUTEquivalent series resistance ESR, first inductance L0A power tube M1, a power tube M2, a first power supply VINA first operational amplifier, an RC series circuit, a first comparator, and a third resistor RSENThe circuit comprises a first SR latch, a first AND gate, a dead zone generation and driving circuit, a slope compensation circuit and a current sensing circuit;
the first resistor R1First terminal of and the second resistor R2Is connected to the first terminal of the second resistor R2The second terminal of the first resistor R is grounded, and the first resistor R is connected with the ground1Second terminal of, the first capacitor COUTThe first terminal of (1), the first inductance L0Are connected to the input of the load, the first capacitor COUTWith a first end of the equivalent series resistance ESR, the second end of the equivalent series resistance ESR being connected to ground, the first inductance L0The source of M1 and the drain of M2 are commonly connected, the source of M2 is grounded, and the drain of M1 is connected to the first power supply VINThe non-inverting input end of the first operational amplifier inputs the reference voltage V through the reference voltage input end of the switching power supply moduleREFThe inverting input terminal of the first operational amplifier and the second resistor R2The output end of the first operational amplifier is connected with the inverting input end of the first comparator and the first end of the RC series circuit, the second end of the RC series circuit is grounded, and the non-inverting input end of the first comparator and the third resistor R are connected with each otherSENIs connected to the first terminal of the third resistor RSENSecond terminal of (1) is groundedThe output end of the first comparator is connected with the R end of the first SR latch, the S end of the first SR latch inputs a clock signal CLK through the clock signal input end of the switching power supply module, the Q end of the first SR latch is connected with the first input end of the first and gate, the second input end of the first and gate inputs a signal obtained by inverting the first signal LightLoad, the output end of the first and gate is connected with the input end of the dead zone generating and driving circuit, the first output end of the dead zone generating and driving circuit is connected with the gate of M1, the second output end of the dead zone generating and driving circuit is connected with the gate of M2, and the input end of the slope compensation circuit is connected with the first resistor R1The output end of the slope compensation circuit and the output end of the current sensing circuit are connected with the third resistor RSENThe input end of the current sensing circuit is connected with the drain electrode of the M2; the first signal LightLoad is generated by the low dropout linear regulator module, and is asserted high when the circuit system is in the low load mode.
In an embodiment of the invention, the first power supply VINV is converted into voltage through the switching power supply module and the low-dropout linear voltage stabilizing moduleINVoltage conversion to a specified VOUTAnd the voltage is output at the output end of the low dropout linear voltage stabilizing module.
The embodiment of the present invention provides a, the dead zone produces and drive circuit's input receives PWM power signal, and its first output and second output two tunnel and input opposite PWM power signal, the signal after the second input first signal LightLoad of first AND gate is got back for make PWM power signal's duty cycle be 0 when low load mode, thereby realize making the purpose that switching power supply module turns off, current sensing circuit replicates and exports inductive current proportionally when inductive current rises, slope compensation circuit exports a slope current signal proportional with output voltage when inductive current rises, the electric current of slope compensation circuit output with the electric current of current sensing circuit input assembles to institute to the instituteThe third resistor RSENAnd converted into a voltage signal; it should be noted that the operating principle of the induction current circuit is as follows: when M1 is turned on and M2 and M3 are turned off, the first power supply V is inputtedINInductance L through M10Charging is performed, and the slope of the inductor current is positive. The M1 source node is connected to the input of a unity gain non-inverting amplifier, the same voltage as that of the M1 source node can be obtained at the output of the amplifier, in the current sensing circuit, a parallel tube of M1 is arranged as M0, the connection relation of M0 is in one-to-one correspondence with M1 except the source, the output of the amplifier is uniquely connected to the source of M0, and the current which is proportional to M1 can be obtained, the current exists only when the slope of the inductive current is positive, and the other time is 0.
In an alternative embodiment, the output end of the low dropout linear regulator module and the first resistor R1And the feedback voltage input end of the low dropout linear regulator module is connected with the first resistor R1Is connected with the first end of the low-dropout linear voltage stabilizing module, and the switch node V of the low-dropout linear voltage stabilizing moduleSWConnected to the drain of M2.
In the embodiment of the present invention, the corresponding schematic point of the feedback voltage input end in fig. 1 is VFBCorrespondingly, when the load current is smaller than the second preset threshold, if the load current continues to be provided by the switching power supply module, a current flows from M2 to ground, and the switching node V is connected to the groundSWThe voltage to ground is greater than 0 when the power tube M2 freewheels.
In an alternative embodiment, the low dropout linear regulator module comprises a switch array and a cooperative sensing circuit;
the switch array comprises 32 current units, the signal input end of the switch array is connected with the signal output end of the cooperative induction circuit, and the output end of the switch array is the output end of the low-dropout linear voltage stabilizing module;
the feedback voltage input end of the cooperative induction circuit is the feedback voltage input end of the low-dropout linear voltage stabilizing module, and the switch node V of the cooperative induction circuitSWFor the low-pressure-difference linear voltage-stabilizing dieSwitch node V of blockSWThe circuit system is used for detecting and latching the operation mode of the circuit system and outputting corresponding signals to the switch array according to the detection result; wherein the operating mode comprises: the normal mode, the high load mode, the transient mode, and the low load mode.
Referring to fig. 3, in an alternative embodiment, the cooperative sensing circuit includes: the shift register comprises a plurality of comparators, a second SR latch, a third SR latch, a fourth SR latch, a fifth SR latch, a sixth SR latch, a D latch and a shift register;
the output ends of the comparators are connected with the second SR latch, the third SR latch, the fourth SR latch, the fifth SR latch, the sixth SR latch and the D latch, and the comparators are used for receiving signals from the feedback voltage input end and the switch node VSWThe received signal outputs a corresponding signal through an output end, wherein the corresponding signal comprises a second signal Under _ V when the output voltage of the low-dropout linear voltage stabilizing module is smaller than a preset lower threshold reference voltageLAnd when the output voltage of the low dropout linear voltage stabilizing module is greater than the preset upper threshold reference voltage, the corresponding third signal Over _ VHA corresponding fourth signal Over _ EN when the load current is greater than the first preset threshold value and a corresponding fifth signal Light _ EN when the load current is less than a second preset threshold value;
the second SR latch is configured to latch an output state of the low dropout linear regulator module and output a corresponding signal to the shift register, where the output state is a working state of the circuit, such as a normal mode and a high load mode;
the third SR latch and the fourth SR latch are used for latching whether the circuit system enters the low-load mode or not and outputting corresponding signals to the shift register;
the fifth SR latch and the sixth SR latch are used for latching the proceeding stage of the transient mode of the circuit system and outputting corresponding signals to the shift register;
the D latch is used for latching whether the circuit system enters the high-load mode or not and outputting a corresponding signal to the shift register;
the shift register is used for outputting a 32-bit level signal for controlling the on or off of a current unit in the switch array according to a received signal; the 32-bit level signal includes a lowest bit level signal and a highest bit level signal, and when the lowest bit level signal is low, the output end of the low dropout linear regulator module does not output current.
In an embodiment of the present invention, when the output voltage of the low dropout linear regulator module is smaller than the preset lower threshold reference voltage, the second signal Under _ VLSet to high, when the output voltage of the low dropout linear regulator module is greater than a preset upper threshold reference voltage, the third signal Over _ VHAnd setting to be high, when the load current is greater than the first preset threshold, setting the fourth signal Over _ EN to be high, and when the load current is less than a second preset threshold, setting the fifth signal Light _ EN to be high.
Referring to fig. 3, in an alternative embodiment, the cooperative sensing circuit further includes a first or gate 4, a second and gate 5, a third and gate 7, a fourth and gate 9, a second operational amplifier 1, an RC integrating circuit, and a second power supply VDD；
The inverting input end of the second operational amplifier 1 is connected with the feedback voltage input end, the non-inverting input end of the second operational amplifier 1 is connected with the output end of the RC integrating circuit, the input end of the RC integrating circuit is connected with the feedback voltage input end, the output end of the second operational amplifier 1 is connected with the R end of the fifth SR latch 2, the output end of the second operational amplifier 1 is inverted and then connected with the R end of the sixth SR latch 3, and the S end of the fifth SR latch 2 is used for receiving the second signal Under _ VLThe Q terminal of the fifth SR latch 2 outputs an undershoot transient signal EN _ Lt, and the S terminal of the sixth SR latch 3 is configured to receive the third signal Over _ VHThe Q terminal of the sixth SR latch 3 outputs an overshoot transient signal EN _ Ht, the Q terminals of the fifth SR latch 2 and the sixth SR latch 3 are further respectively input to the first input terminal and the second input terminal of the first or gate 4, the output terminal of the first or gate 4 outputs a transient mode signal Tran _ EN, the first input terminal of the second and gate 5 is configured to receive the overshoot transient signal EN _ Ht, the second input terminal of the second and gate 5 is configured to receive the inverted signal of the highest bit level signal, the output terminal of the second and gate 5 is connected to the S terminal of the second SR latch 6, the R terminal of the second SR latch 6 is configured to receive the inverted signal of the highest bit level signal, the Q terminal of the second SR latch 6 outputs a CTRL signal, and the first input terminal of the third and gate 7 is configured to receive the transient mode signal Tran _ EN, a second input end of the third and gate 7 is configured to receive the signal after the highest bit level signal is inverted, an output end of the third and gate 7 is connected to an R end of the third SR latch 8, an S end of the third SR latch 8 is configured to receive the signal after the highest bit level signal is inverted, a Q end of the third SR latch 8 is connected to a first end of the fourth and gate 9, a second end of the fourth and gate 9 is configured to input the fifth signal Light _ EN, an output end of the fourth and gate 9 is connected to an S end of the fourth SR latch 10, an R end of the fourth SR latch 10 is configured to input the transient mode signal Tran _ EN, a Q end of the fourth SR latch 10 is configured to output the first signal Light load corresponding to the low load mode, and a D end of the D latch 11 is connected to the second power supply VDDAnd the clock signal input end Clk of the D latch 11 is configured to receive the fourth signal Over _ EN, the Reset end of the D latch 11 is configured to receive the transient mode signal Tran _ EN, and the Q end of the D latch 11 outputs a sixth signal OverLoad corresponding to the high load mode.
In the embodiment of the present invention, when the load current jumps down, the undershoot transient signal EN _ Lt is set to high, when the load current jumps up, the overshoot transient signal EN _ Ht is set to high, the CTRL signal is also set to high, when the load current jumps up or down, the transient mode signal Tran _ EN is set to high, when the circuit system is in the high load mode, the sixth signal overhoad is set to high.
Referring to fig. 4, in an alternative embodiment, the cooperative sensing circuit further includes a charge pump and a level shifter;
the input end of the charge pump is connected with an external power supply, and the output end of the charge pump is connected with the level shifter;
one input end of the level shifter is connected with one output end of the shift register, one output end of the level shifter is connected with one current unit, and the output end of the level shifter outputs a current unit control signal EN.
In the embodiment of the present invention, since the switch array includes 32 current cells, the shift register is 32 bits.
In an optional embodiment, the first signal LightLoad is further output through a control terminal of the cooperative sensing circuit, the control terminal is connected to a gate of a power transistor M3, a source of the power transistor M3 is connected to the switch node VsWThe input ends of the current sensing circuits are connected together, and the drain electrode of the power tube M3 is connected with the first inductor L0Is connected to the first end of the first housing.
Referring to fig. 5, in an alternative embodiment, one of the current units includes a single-pole double-throw switch and two NMOS transistors, and the normally-open end and the normally-closed end of the single-pole double-throw switch are respectively connected to the gates of the two NMOS transistors.
In an embodiment of the present invention, the single-pole double-throw switch receives the current unit control signal EN to control the logic circuit to convert the Q-end output CTRL signal of the second SR latch 6 into the double VDDA drive signal of a level; note that, VDDCorresponding to V in FIG. 1IN。
In an alternative embodiment, the clock module has a dual-loop feedback structure.
The embodiment of the utility model provides an in, clock module has used dicyclo feedback structure, has high accuracy, high reliability, the strong characteristics of stability.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.

Claims (10)

1. A step-down DC voltage conversion circuit with a main and auxiliary structure, applied to a circuit system, for stepping down an input voltage of the circuit system to a specific voltage and outputting the voltage to a load, comprising: the low-dropout linear voltage regulator comprises a switching power supply module, a low-dropout linear voltage regulator module, a voltage reference module and a clock module;
the switching power supply module is connected with the load and used for providing load current for the load;
the output end of the low-dropout linear voltage stabilizing module is connected with the switching power supply module, the output end of the low-dropout linear voltage stabilizing module does not output current in a preset conventional mode, the current of a part of the load current higher than a first preset threshold value is output in a preset high-load mode, the instantaneous current with the same trend as the sudden change trend of the load is output in a preset transient mode, and all the load current is output in a preset low-load mode;
the output end of the voltage reference module is respectively connected with the reference voltage input end of the low dropout linear voltage stabilizing module and the reference voltage input end of the voltage reference module, and the voltage reference module is used for generating a reference voltage V with a preset voltage valueREF；
And the output end of the clock module is respectively connected with the clock signal input end of the low dropout linear voltage stabilizing module and the clock signal input end of the voltage reference module, and the clock module is used for respectively providing the required clock signal CLK for the low dropout linear voltage stabilizing module and the voltage reference module.
2. The buck dc voltage conversion circuit according to claim 1, wherein the switching power supply module includes a first resistor R1A second resistor R2A first capacitor COUTEquivalent series resistance ESR, first inductance L0A power tube M1, a power tube M2, a first power supply, a first operational amplifier, an RC series circuit, a first comparator, and a third resistor RSENThe circuit comprises a first SR latch, a first AND gate, a dead zone generation and driving circuit, a slope compensation circuit and a current sensing circuit;
the first resistor R1First terminal of and the second resistor R2Is connected to the first terminal of the second resistor R2The second terminal of the first resistor R is grounded, and the first resistor R is connected with the ground1Second terminal of, the first capacitor COUTThe first terminal of (1), the first inductance L0Are connected to the input of the load, the first capacitor COUTWith a first end of the equivalent series resistance ESR, the second end of the equivalent series resistance ESR being connected to ground, the first inductance L0The source of M1 and the drain of M2 are commonly connected, the source of M2 is grounded, the drain of M1 is connected with the first power supply, the non-inverting input terminal of the first operational amplifier inputs the reference voltage V through the reference voltage input terminal of the switching power supply moduleREFThe inverting input terminal of the first operational amplifier and the second resistor R2The output end of the first operational amplifier is connected with the inverting input end of the first comparator and the first end of the RC series circuit, the second end of the RC series circuit is grounded, and the non-inverting input end of the first comparator and the third resistor R are connected with each otherSENIs connected to the first terminal of the third resistor RSENThe second end of the first comparator is grounded, the output end of the first comparator is connected with the R end of the first SR latch, the S end of the first SR latch inputs a clock signal CLK through the clock signal input end of the switching power supply module, the Q end of the first SR latch is connected with the first input end of the first AND gate, the second input end of the first AND gate inputs a signal obtained by inverting the first signal LightLoad, the output end of the first AND gate is connected with the input end of the dead zone generating and driving circuit, the first output end of the dead zone generating and driving circuit is connected with the grid of M1, and the dead zone generating and driving circuit is connected with the grid of the M1The second output end of the generating and driving circuit is connected with the grid of the M2, and the input end of the slope compensation circuit is connected with the first resistor R1The output end of the slope compensation circuit and the output end of the current sensing circuit are connected with the third resistor RSENThe input end of the current sensing circuit is connected with the drain electrode of the M2; the first signal LightLoad is generated by the low dropout linear regulator module, and is asserted high when the circuit system is in the low load mode.
3. The buck-type DC voltage conversion circuit according to claim 2, wherein the first resistor R and the output end of the low dropout linear regulator module1And the feedback voltage input end of the low dropout linear regulator module is connected with the first resistor R1Is connected with the first end of the low-dropout linear voltage stabilizing module, and the switch node V of the low-dropout linear voltage stabilizing moduleSWConnected to the drain of M2.
4. The buck dc voltage conversion circuit according to claim 3, wherein the low dropout linear regulator module comprises a switch array and a cooperative sensing circuit;
the switch array comprises 32 current units, the signal input end of the switch array is connected with the signal output end of the cooperative induction circuit, and the output end of the switch array is the output end of the low-dropout linear voltage stabilizing module;
the feedback voltage input end of the cooperative induction circuit is the feedback voltage input end of the low-dropout linear voltage stabilizing module, and the switch node V of the cooperative induction circuitSWIs a switching node V of the low dropout linear regulator moduleSWThe circuit system is used for detecting and latching the operation mode of the circuit system and outputting corresponding signals to the switch array according to the detection result; wherein the operating mode comprises: the normal mode, the high load mode, the transient mode, and the low load mode.
5. The buck dc voltage conversion circuit according to claim 4, wherein the cooperative sensing circuit comprises: the shift register comprises a plurality of comparators, a second SR latch, a third SR latch, a fourth SR latch, a fifth SR latch, a sixth SR latch, a D latch and a shift register;
the output ends of the comparators are connected with the second SR latch, the third SR latch, the fourth SR latch, the fifth SR latch, the sixth SR latch and the D latch, and the comparators are used for receiving signals from the feedback voltage input end and the switch node VSWThe received signal outputs a corresponding signal through an output end, wherein the corresponding signal comprises a second signal Under _ V when the output voltage of the low-dropout linear voltage stabilizing module is smaller than a preset lower threshold reference voltageLAnd when the output voltage of the low dropout linear voltage stabilizing module is greater than the preset upper threshold reference voltage, the corresponding third signal Over _ VHA corresponding fourth signal Over _ EN when the load current is greater than the first preset threshold value and a corresponding fifth signal Light _ EN when the load current is less than a second preset threshold value;
the second SR latch is used for latching the output state of the low-dropout linear voltage stabilizing module and outputting a corresponding signal to the shift register;
the third SR latch and the fourth SR latch are used for latching whether the circuit system enters the low-load mode or not and outputting corresponding signals to the shift register;
the fifth SR latch and the sixth SR latch are used for latching the proceeding stage of the transient mode of the circuit system and outputting corresponding signals to the shift register;
the D latch is used for latching whether the circuit system enters the high-load mode or not and outputting a corresponding signal to the shift register;
the shift register is used for outputting a 32-bit level signal for controlling the on or off of a current unit in the switch array according to a received signal; the 32-bit level signal includes a lowest bit level signal and a highest bit level signal, and when the lowest bit level signal is low, the output end of the low dropout linear regulator module does not output current.
6. The buck direct-current voltage conversion circuit according to claim 5, wherein the cooperative sensing circuit further comprises a first OR gate, a second AND gate, a third AND gate, a fourth AND gate, a second operational amplifier, an RC integrating circuit, and a second power supply;
the inverting input end of the second operational amplifier is connected with the feedback voltage input end, the non-inverting input end of the second operational amplifier is connected with the output end of the RC integrating circuit, the input end of the RC integrating circuit is connected with the feedback voltage input end, the output end of the second operational amplifier is connected with the R end of the fifth SR latch, the output end of the second operational amplifier is connected with the R end of the sixth SR latch after being inverted, and the S end of the fifth SR latch is used for receiving the second signal Under _ VLThe Q terminal of the fifth SR latch outputs an undershoot transient signal EN _ Lt, and the S terminal of the sixth SR latch is configured to receive the third signal Over _ VHThe Q terminal of the sixth SR latch outputs an overshoot transient signal EN _ Ht, the Q terminal of the fifth SR latch and the Q terminal of the sixth SR latch further input the first input terminal and the second input terminal of the first or gate, respectively, the output terminal of the first or gate outputs a transient mode signal Tran _ EN, the first input terminal of the second and gate is configured to receive the overshoot transient signal EN _ Ht, the second input terminal of the second and gate is configured to receive the inverted signal of the highest bit level signal, the output terminal of the second and gate is connected to the S terminal of the second SR latch, the R terminal of the second SR latch is configured to receive the inverted signal of the highest bit level signal, the Q terminal of the second SR latch outputs a CTRL signal, the first input terminal of the third and gate is configured to receive the transient mode signal Tran _ EN, and the second input terminal of the third and gate is configured to receive the inverted signal of the highest bit level signal, of said third AND gateThe output end is connected with the R end of the third SR latch, the S end of the third SR latch is used for receiving the signal after the inversion of the highest bit level signal, the Q end of the third SR latch is connected with the first end of the fourth AND gate, the second end of the fourth AND gate is used for inputting the fifth signal LightEN, the output end of the fourth AND gate is connected with the S end of the fourth SR latch, the R end of the fourth SR latch is used for inputting the transient mode signal Tran _ EN, the Q terminal of the fourth SR latch is used to output the first signal LightLoad corresponding to the low load mode, the D end of the D latch is connected with the second power supply, the clock signal input end Clk of the D latch is used for receiving the fourth signal OverEN, the Reset terminal of the D latch is used to receive the transient mode signal Tran _ EN, and the Q end of the D latch outputs a sixth signal OverLoad corresponding to the high load mode.
7. The buck dc voltage conversion circuit according to claim 5 or 6, wherein the cooperative sensing circuit further comprises a charge pump and a level shifter;
the input end of the charge pump is connected with an external power supply, and the output end of the charge pump is connected with the level shifter;
one input end of the level shifter is connected with one output end of the shift register, one output end of the level shifter is connected with one current unit, and the output end of the level shifter outputs a current unit control signal EN.
8. The buck dc voltage converting circuit according to claim 6, wherein the first signal LightLoad is further output through a control terminal of the cooperative sensing circuit, the control terminal is connected to a gate of a power transistor M3, and a source of the power transistor M3 is connected to the switching node VSWThe input ends of the current sensing circuits are connected together, and the drain electrode of the power tube M3 is connected with the first inductor L0Is connected to the first end of the first housing.
9. The buck dc voltage conversion circuit according to claim 4, wherein one of the current cells comprises a single-pole double-throw switch and two NMOS transistors, and the normally-open end and the normally-closed end of the single-pole double-throw switch are respectively connected to the gates of the two NMOS transistors.
10. The buck dc voltage conversion circuit of claim 1, wherein the clock module is configured as a dual-loop feedback structure.
CN202020168554.3U 2020-02-13 2020-02-13 Step-down direct-current voltage conversion circuit with main and auxiliary structures Active CN211791279U (en)

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