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CN115528787B - Control loop accelerating circuit - Google Patents

Control loop accelerating circuit Download PDF

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Publication number
CN115528787B
CN115528787B CN202211503613.8A CN202211503613A CN115528787B CN 115528787 B CN115528787 B CN 115528787B CN 202211503613 A CN202211503613 A CN 202211503613A CN 115528787 B CN115528787 B CN 115528787B
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voltage
node
switching tube
circuit
output
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CN115528787A (en
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请求不公布姓名
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Suzhou Baker Microelectronics Co Ltd
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Suzhou Baker Microelectronics Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • 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
    • 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
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electron Sources, Ion Sources (AREA)

Abstract

The application discloses a control loop accelerating circuit, and particularly relates to the technical field of battery power supply. In the control loop accelerating circuit, the output end of a main power switch tube is connected to a first node through a first voltage dividing circuit; the first node is grounded through a second voltage dividing circuit; the power supply voltage end is connected to the second node through a third switching tube and a first switching tube in sequence; the power supply voltage end is also connected to a third node through a fourth switching tube; the third node is connected to the second node through a second switching tube; the third node is connected to the control end of the main power switch tube; the first node is connected to the control end of the first switching tube; the control end of the second switching tube is connected with a reference voltage; the second node is grounded through a first current source; the second node is grounded with an acceleration current source through an acceleration switch tube; the control end of the acceleration switch tube is connected to the output end of the voltage comparison unit. Based on the above circuit, the output voltage regulation speed can be improved when the output current suddenly changes.

Description

Control loop accelerating circuit
Technical Field
The application relates to the technical field of battery power supply, in particular to a control loop accelerating circuit.
Background
In a power supply circuit using a conventional battery as a power supply source, if the output current of the circuit suddenly changes, the current flowing through the main power switching tube also changes at this time, and therefore, a control loop in the battery power supply circuit needs to adaptively adjust the turn-on voltage of the main power switching tube, so as to adapt the current flowing through the main power switching tube.
Since the regulation speed of the control loop in the conventional battery power supply circuit does not follow the change of the output current, the turn-on voltage of the main power switching tube is still kept at the original voltage at the moment of the change of the output current, but the current flowing through the main power switching tube is changed, so that the voltage at two ends of the main power switching tube is changed, and the output voltage is changed, until the control loop finishes the regulation of the turn-on voltage of the main power switching tube. At this time, fluctuation of the output voltage can bring great influence to the power load and the battery power supply circuit, and if the output voltage is too small, the power load or the battery power supply circuit is used for shutdown; if the output voltage is too high, the electrical load or battery-powered circuitry may be damaged.
Therefore, there is a need to use a control loop acceleration circuit to ensure that the regulation speed of the output voltage is increased when the output voltage is too large or too small, thereby controlling the ripple voltage of the output voltage of the battery power supply circuit within a reasonable range.
Disclosure of Invention
The application provides a control loop accelerating circuit, which can improve the regulating speed of the output voltage of a battery power supply circuit when the output current suddenly changes, and control the fluctuation voltage of the output voltage of the battery power supply circuit in a reasonable range.
In one aspect, a control loop accelerating circuit is provided, which comprises an accelerating switch tube, an accelerating current source, a main power switch tube, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube and a first current source;
the input end of the main power switching tube is connected with a power supply voltage end, and the output end of the main power switching tube is connected with an output voltage end; the output end of the main power switch tube is also connected to a first node through a first voltage dividing circuit; the first node is grounded through a second voltage dividing circuit;
the power supply voltage end is connected to the second node through a third switching tube and the first switching tube in sequence; the power supply voltage end is also connected to a third node through a fourth switching tube; the third node is connected to the second node through a second switching tube; the third switching tube and the fourth switching tube form a current mirror structure; the third node is connected to the control end of the main power switching tube; the first node is connected to the control end of the first switching tube; the control end of the second switching tube is connected with a reference voltage;
The second node is grounded through a first current source; the second node is grounded through an acceleration switch tube and an acceleration current source in turn;
the control end of the acceleration switch tube is connected with the output end of the voltage comparison unit; the voltage comparison unit is used for comparing whether the voltage of the output voltage terminal belongs to a designated voltage interval or not, and outputting a high level when the voltage does not belong to the designated voltage interval.
In one possible implementation manner, the first voltage dividing circuit includes a first voltage dividing resistor and a second voltage dividing resistor; the second voltage dividing circuit comprises a third voltage dividing resistor and a fourth voltage dividing resistor;
the output end of the main power switching tube is connected to a first voltage division node through a first voltage division resistor; the first voltage division node is connected to a first node through the second voltage division resistor;
the first node is connected to a second voltage division node through a third voltage division resistor; and the second voltage division node is grounded through the fourth voltage division resistor.
In one possible implementation, the voltage comparison unit includes a first comparator, a second comparator, and a first or logic gate;
the output end of the first comparator and the output end of the second comparator are respectively connected to two input ends of a first OR logic gate; the output end of the first OR logic gate is connected to the control end of the acceleration switch tube;
The non-inverting input end of the first comparator and the inverting input end of the second comparator are connected with reference voltage; the inverting input end of the first comparator is connected with a first voltage division node; and the non-inverting input end of the second comparator is connected with the second voltage division node.
In one possible implementation, the first voltage dividing node is connected to a third voltage dividing node through the second voltage dividing resistor; the third voltage division node is connected to the first node through a fifth voltage division resistor;
the second voltage division node is connected to a fourth voltage division node through the fourth voltage division resistor; the fourth voltage division node is grounded through a sixth voltage division resistor;
the third voltage division node is also connected to the first node through a fifth switching tube; the control end of the fifth switching tube is connected with the output end of the first comparator;
the fourth voltage division node is grounded through a sixth switch tube; the output end of the second comparator is connected to the control end of the sixth switching tube through a NOT gate.
In one possible implementation, the output terminal of the main power switch tube is also grounded through an output filter capacitor.
In one possible implementation manner, the first switching tube, the second switching tube and the acceleration switching tube are NMOS tubes;
Or the first switching tube, the second switching tube and the accelerating switching tube are NPN triodes.
In one possible implementation manner, the third switching tube, the fourth switching tube and the main power switching tube are PMOS tubes;
or the third switching tube, the fourth switching tube and the main power switching tube are PNP triodes.
In yet another aspect, a battery powered circuit is provided, the battery powered circuit comprising the control loop acceleration circuit described above;
in the battery power supply circuit, an acceleration switch tube, an acceleration current source, a main power switch tube, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first current source and a voltage comparison unit are positioned in a main control chip;
the first voltage dividing circuit and the second voltage dividing circuit are positioned outside the main control chip;
the main control chip comprises a voltage output pin and a first sampling pin; the voltage output pin is connected to the first node through a first voltage dividing circuit in sequence; the first node is connected to the first sampling pin.
In one possible implementation, the circuit further includes a target battery and an input filter capacitor; the main control chip comprises a power supply voltage pin;
The power supply voltage pin is grounded through the input filter capacitor;
the power supply voltage pin is connected to the anode of the target battery; the negative electrode of the target battery is grounded.
In one possible implementation, the main control chip includes a second sampling pin and a third sampling pin; the second sampling pin is connected with a first voltage division node in the first voltage division circuit; and the third sampling pin is connected with a second voltage division node in the second voltage division circuit.
The technical scheme that this application provided can include following beneficial effect:
in a battery power supply scene, a control loop accelerating circuit is arranged, and the circuit comprises an accelerating switch tube, an accelerating current source, a main power switch tube, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube and a first current source; the input end of the main power switching tube is connected with the power supply voltage end, and the output end of the main power switching tube is connected with the output voltage end; the output end of the main power switching tube is also connected to a first node through a first voltage dividing circuit; the first node is grounded through a second voltage dividing circuit; the power supply voltage end is connected to the second node through a third switching tube and a first switching tube in sequence; the power supply voltage end is also connected to a third node through a fourth switching tube; the third node is connected to the second node through a second switching tube; the third switching tube and the fourth switching tube form a current mirror structure; the third node is connected to the control end of the main power switch tube; the first node is connected to the control end of the first switching tube; the control end of the second switching tube is connected with a reference voltage; the second node is grounded through a first current source; the second node is grounded through an acceleration switch tube and an acceleration current source in turn; the control end of the acceleration switch tube is connected with the output end of the voltage comparison unit; the voltage comparison unit is used for comparing whether the voltage of the output voltage terminal belongs to a designated voltage interval or not, and outputting a high level when the voltage does not belong to the designated voltage interval.
In a battery power supply scene, when output current suddenly changes to cause excessive or insufficient output voltage, the control loop accelerating circuit can compare whether the voltage of the output voltage end belongs to a designated voltage interval or not through the voltage comparing unit, and when the voltage does not belong to the designated voltage interval, the control accelerating switching tube is controlled to be conducted so as to improve the regulating speed of the output voltage, the fluctuation voltage of the output voltage is controlled in a reasonable range, the reliability of the battery power supply circuit is further improved, and the safety of an electric load is ensured.
Because the accelerating switch tube is not conducted when the voltage of the output voltage end belongs to the appointed voltage interval, and the accelerating switch tube is conducted when the voltage of the output voltage end does not belong to the appointed voltage interval, the circuit is in a low power consumption state when the regulation speed of the control loop is not required to be accelerated, the acceleration of the regulation speed of the control loop and the output voltage is realized when the regulation speed of the control loop is required to be accelerated, and the circuit power consumption and the regulation speed are balanced.
The circuit of the application also compares the sampled output voltage with the reference voltage without additionally increasing fixed voltage, thereby reducing the circuit volume; when the circuit is in different applications, namely when the normal value of the output voltage is different in the steady state of the circuit, the required reference voltage is also different, but because the sampling voltage value and the reference voltage in the circuit are in a proportional relation, the output voltage can be controlled with the same control precision no matter how the reference voltage changes, so that the control precision and the application range of the circuit are greatly improved; the temperature coefficient of each sampling voltage and the temperature coefficient of the reference voltage in the circuit are the same, so that the control signal output by the voltage comparison unit is not affected by temperature, and the control precision of the circuit is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram illustrating a control loop acceleration circuit according to an exemplary embodiment.
Fig. 2 shows an output waveform diagram of a circuit according to an embodiment of the present application.
Fig. 3 shows a schematic structural diagram of a control loop acceleration circuit according to an embodiment of the present application.
FIG. 4 is a schematic diagram of a control loop acceleration circuit, according to an example embodiment.
Fig. 5 is a schematic diagram showing an equivalent structure of a control loop acceleration circuit for normal output voltage according to an embodiment of the present application.
Fig. 6 is a schematic diagram showing an equivalent structure of a control loop acceleration circuit when the output voltage is too low according to the embodiment of the present application.
Fig. 7 is a schematic diagram showing an equivalent structure of a control loop acceleration circuit when the output voltage is too high according to an embodiment of the present application.
Fig. 8 shows a schematic structural diagram of a battery-powered circuit according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Fig. 1 is a schematic diagram illustrating a control loop acceleration circuit according to an exemplary embodiment. The control loop accelerating circuit can be applied to a battery power supply scene to improve the regulating speed of the output voltage and control the fluctuation voltage of the output voltage within a reasonable range. As shown in FIG. 1, the control loop acceleration circuit comprises an acceleration switch tube Mx and an acceleration current source I sx Main power switching tube Mp, first switching tube M1, second switching tube M2, third switching tube M3, fourth switching tube M4 and first current source I s ；
An input end of the main power switch tube Mp is connected with a power supply voltage end VDD, and an output end of the main power switch tube Mp is connected with an output voltage end V OUT The method comprises the steps of carrying out a first treatment on the surface of the The output end of the main power switch tube Mp is also connected to a first node through a first voltage dividing circuit; the first node is grounded through a second voltage dividing circuit;
the power supply voltage end is connected to the second node through a third switching tube M3 and a first switching tube M1 in sequence; the power supply voltage terminal VDD is also connected to a third node through a fourth switching tube M4; the third node is connected to the second node through a second switching tube M2; the third switching tube M3 and the fourth switching tube M4 form a current mirror structure; the third node is connected to the control end of the main power switching tube Mp; the first node is connected to the control end of the first switching tube M1; the control end of the second switching tube M2 is connected with the reference voltage V REF ；
The second nodeThrough a first current source I s Grounding; the second node also sequentially passes through an acceleration switch tube Mx and an acceleration current source I sx Grounding;
the control end of the acceleration switch tube Mx is connected with the output end of the voltage comparison unit; the voltage comparing unit is used for comparing whether the voltage of the output voltage terminal belongs to a designated voltage interval or not, and outputting a high level when the voltage does not belong to the designated voltage interval.
In a power supply circuit using a commonly used battery as a power supply source, if the output current of the circuit suddenly increases, the current flowing through the main power switching tube also increases, but since the adjusting speed of a control loop in the commonly used battery power supply circuit does not follow the change of the output current, the turn-on voltage of the main power switching tube still remains at the original voltage at the moment of the change of the output current, and the current flowing through the main power switching tube increases, the voltage at two ends of the main power switching tube increases at the moment, so that the output voltage decreases. That is, after the output current of the power supply circuit of the battery increases, the output voltage is reduced to a certain value in a short time until the control loop completes the adjustment of the on voltage of the main power switch tube; similarly, after the output current of the power supply circuit of the battery is reduced, the output voltage can be increased to a certain value in a short time until the control loop finishes the adjustment of the on voltage of the main power switch tube.
FIG. 2 shows the output waveform of the circuit in the above case, where I OUT To output current, V OUT For output voltage, t is time. As shown in fig. 2, the output current is suddenly reduced, and the output voltage fluctuates until the output current is stable; the output current increases suddenly again and the output voltage fluctuates until the output current stabilizes again.
The fluctuation of the output voltage can have a large influence on the power load and the battery power supply circuit. The output voltage is too small, which can cause the power load or the battery power supply circuit to be shut down; the output voltage is too high, which can damage the electrical load or the battery-powered circuit. Therefore, it is necessary to ensure the regulation speed of the control loop in the battery-powered circuit so that the control loop can adapt the on-voltage of the main power switching tube in time, thereby adapting the current flowing through the main power switching tube in time.
Therefore, the embodiment of the application provides the control loop accelerating circuit shown in fig. 1, so as to ensure that when the output voltage is too large or too small, the regulating speed of the output voltage is improved, and therefore the fluctuation voltage of the output voltage of the battery power supply circuit is controlled within a reasonable range.
The principle of the control loop acceleration circuit shown in fig. 1 is as follows:
As shown in fig. 1, taking the switching transistors as MOS transistors, the power supply is turned on first, and the gate (i.e., control end) of the second switching transistor M2 is connected to the reference voltage V REF The second switching tube M2 is thus turned on. At this time, the gate voltage V of the main power switch tube Mp g Through a second switching tube M2 and a first current source I s The main power switch tube Mp is pulled down to be conducted, under the action of the first voltage dividing circuit and the second voltage dividing circuit, the first node generates sampling voltage fb, the grid electrode of the first switch tube M1 connected with the first node is pulled up by the sampling voltage fb, and the first switch tube M1 is conducted. At this time, the gates of the third switching tube M3 and the fourth switching tube M4 pass through the first switching tube M1 and the first current source I s The third switching tube M3 and the fourth switching tube M4 are turned on when pulled down. At this time, a first current I is generated in the first switching tube M1 and the third switching tube M3 1 Generating a second current I in a second switching tube M2 2 Generating a fourth current I in a fourth switching tube M4 4 And since the third switching tube M3 and the fourth switching tube M4 form a current mirror structure, I is 1 =I 4 . Meanwhile, when the circuit reaches a steady state, the grid voltage V of the main power switch tube Mp g Unchanged, at this time, I 4 =I 2 I.e. at steady state, I 1 =I 4 =I 2 =I s /2。
Therefore, the gate-source voltage of the first switching tube M1 is equal to the gate-source voltage of the second switching tube M2, and since the sources of the first switching tube M1 and the second switching tube M2 are connected, that is, the source voltages of the first switching tube M1 and the second switching tube M2 are equal, the gate voltages of the first switching tube M1 and the second switching tube M2 are also equal. Thus, in steady state, the sampling voltage fb=v REF =[R2/(R1+R2)]*V OUT Wherein R1 is the resistance value of the first voltage dividing circuit, and R2 is the resistance value of the second voltage dividing circuit. At this time, an output voltage instantaneous value V can be obtained OUT =[(R1+R2)/R2]* fb, output voltage V at steady state OUT Normal value V of (2) OUTP =[(R1+R2)/R2]*V REF I.e. when the circuit is in steady state, the sampling voltage fb=v REF The gate-source voltages of the first switching tube M1 and the second switching tube M2 are equal, I 1 =I 2 =I s /2。
When outputting voltage V OUT When the sampling voltage fb decreases, the sampling voltage fb also decreases<V REF Therefore, the gate-source voltage of the first switching tube M1 is smaller than that of the second switching tube M2, resulting in a second current I 2 Greater than the first current I 1 But still maintain I 1 +I 2 =I s Therefore, the grid electrode of the main power switch tube Mp flows out charges, and the grid electrode voltage V of the main power switch tube Mp g Decreasing, the current flowing through the main power switching tube Mp increases, thereby increasing the output voltage V OUT . If the sampling voltage fb drops too much, the most extreme case is I 4 =I 1 =0，I 2 =I s At this time, the gate capacitance of the main power switch tube Mp is I s The discharge is performed by a current of a magnitude.
When outputting voltage V OUT When the voltage rises, the sampling voltage fb also increases, and at this time fb>V REF Therefore, the gate-source voltage of the first switching tube M1 is greater than that of the second switching tube M2, resulting in a second current I 2 Less than the first current I 1 But still maintain I 1 +I 2 =I s Therefore, the grid electrode of the main power switch tube Mp flows in charges, and the grid electrode voltage V of the main power switch tube Mp g Increases, the current flowing through the main power switch tube Mp decreases, thereby decreasing the output voltage V OUT . If the sampling voltage fb increases too much, the most extreme case is I 4 =I 1 =I s ，I 2 The gate capacitance of the main power switch Mp is equal to I s The charging is performed by a current of a magnitude.
Therefore, the gate voltage V of the main power switch tube Mp g Is regulated at a speed and a first current source I s Has a great relation with the size of the first current source I s I.e. the gate voltage V of the loop-to-main power switching tube Mp can be increased g Thereby increasing the regulation speed to the output voltage V OUT Is provided. At the same time due to the output current I OUT When suddenly decreasing, the output voltage V OUT Will suddenly increase when the output current I OUT When suddenly increasing, the output voltage V OUT Suddenly decreases, so that the circuit can be designed to output the voltage V OUT Above a certain high value or below a certain low value, the regulation speed of the control loop is increased, so that the output voltage V is increased OUT Is controlled within a reasonable range.
Therefore, the acceleration switch tube Mx and the acceleration current source I can be arranged sx And a voltage comparing unit for connecting the control terminal of the acceleration switch tube Mx to the output terminal of the voltage comparing unit, wherein the voltage comparing unit can set a designated voltage interval and compare the voltage of the output voltage terminal (i.e. output voltage V OUT ) Whether within a specified voltage interval. If the output voltage V OUT Within the specified voltage interval, the operation is not performed; if the output voltage V OUT If not in the specified voltage interval, outputting high level to control the on of the acceleration switch tube Mx to accelerate the current source I sx In the access control circuit, thereby increasing the current source size to I s +I sx The adjusting speed of the control loop is quickened.
In summary, in a battery power supply scenario, a control loop accelerating circuit is provided, where the control loop accelerating circuit includes an accelerating switch tube, an accelerating current source, a main power switch tube, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube and a first current source; the input end of the main power switching tube is connected with the power supply voltage end, and the output end of the main power switching tube is connected with the output voltage end; the output end of the main power switching tube is also connected to a first node through a first voltage dividing circuit; the first node is grounded through a second voltage dividing circuit; the power supply voltage end is connected to the second node through a third switching tube and a first switching tube in sequence; the power supply voltage end is also connected to a third node through a fourth switching tube; the third node is connected to the second node through a second switching tube; the third switching tube and the fourth switching tube form a current mirror structure; the third node is connected to the control end of the main power switch tube; the first node is connected to the control end of the first switching tube; the control end of the second switching tube is connected with a reference voltage; the second node is grounded through a first current source; the second node is grounded through an acceleration switch tube and an acceleration current source in turn; the control end of the acceleration switch tube is connected with the output end of the voltage comparison unit; the voltage comparison unit is used for comparing whether the voltage of the output voltage terminal belongs to a designated voltage interval or not, and outputting a high level when the voltage does not belong to the designated voltage interval.
In a battery power supply scene, when output current suddenly changes to cause excessive or insufficient output voltage, the control loop accelerating circuit can compare whether the voltage of the output voltage end belongs to a designated voltage interval or not through the voltage comparing unit, and when the voltage does not belong to the designated voltage interval, the control accelerating switching tube is controlled to be conducted so as to improve the regulating speed of the output voltage, the fluctuation voltage of the output voltage is controlled in a reasonable range, the reliability of the battery power supply circuit is further improved, and the safety of an electric load is ensured.
Because the accelerating switch tube is not conducted when the voltage of the output voltage end belongs to the appointed voltage interval, and the accelerating switch tube is conducted when the voltage of the output voltage end does not belong to the appointed voltage interval, the circuit is in a low power consumption state when the regulation speed of the control loop is not required to be accelerated, the acceleration of the regulation speed of the control loop and the output voltage is realized when the regulation speed of the control loop is required to be accelerated, and the circuit power consumption and the regulation speed are balanced.
The control loop acceleration circuit may also be of the construction shown in fig. 3, based on fig. 1. Fig. 3 shows a schematic structural diagram of a control loop acceleration circuit according to an embodiment of the present application. As shown in fig. 3, in one possible implementation, the first voltage dividing circuit includes a first voltage dividing resistor R f1a And a second voltage-dividing resistor R f1b The method comprises the steps of carrying out a first treatment on the surface of the The second voltage dividing circuit comprises a third voltage dividing resistor R f2a Fourth voltage dividing resistor R f2b The method comprises the steps of carrying out a first treatment on the surface of the The output end of the main power switch tube Mp passes through a first voltage dividing resistor R f1a Connected to the first voltage dividing node;the first voltage dividing node passes through the second voltage dividing resistor R f1b Connected to the first node; the first node passes through a third voltage dividing resistor R f2a Connected to the second voltage division node; the second voltage dividing node passes through the fourth voltage dividing resistor R f2b And (5) grounding.
As shown in fig. 3, in one possible implementation, the voltage comparing unit includes a first comparator COM1, a second comparator COM2, and a first or logic gate U1; the output end of the first comparator COM1 and the output end of the second comparator COM2 are respectively connected to two input ends of the first or logic gate U1; the output end of the first OR logic gate U1 is connected to the control end of the acceleration switch tube Mx; the non-inverting input terminal of the first comparator COM1 and the inverting input terminal of the second comparator COM2 are connected to the reference voltage V REF The method comprises the steps of carrying out a first treatment on the surface of the The inverting input end of the first comparator COM1 is connected with a first voltage division node; the non-inverting input of the second comparator COM2 is connected to the second voltage dividing node.
In one possible implementation, as shown in fig. 3, the output of the main power switching tube is also connected to the output filter capacitor C L And (5) grounding.
As shown in fig. 3, in one possible implementation manner, the first switching tube M1, the second switching tube M2, and the acceleration switching tube Mx are NMOS tubes; alternatively, the first switching transistor M1, the second switching transistor M2, and the acceleration switching transistor Mx are NPN transistors.
As shown in fig. 3, in one possible implementation manner, the third switching tube M3, the fourth switching tube M4 and the main power switching tube Mp are PMOS tubes; alternatively, the third switching transistor M3, the fourth switching transistor M4 and the main power switching transistor Mp are PNP transistors.
The control loop acceleration circuit shown in fig. 3 operates as follows:
when the power supply is turned on, after the main power switch tube Mp is turned on, the four voltage dividing resistors generate voltage, the first voltage dividing node generates a first sampling voltage, and the second voltage dividing node generates a second sampling voltage.
When the circuit reaches steady state, the voltage is sampled
Figure SMS_1
At this point the output voltage transient is available +.>
Figure SMS_2
Output voltage V at steady state OUT Normal value of (2)
Figure SMS_3
。
The principle of increasing the first current source, i.e. increasing the speed of the control loop for adjusting the output voltage, is similar to that of the embodiment of fig. 1, and will not be described again.
Further, the output voltage V can be obtained by four voltage dividing resistors OUT Sampling to obtain a first sampling voltage V s1 And a second sampling voltage V s2 Wherein, in a steady state,
Figure SMS_4
，/>
Figure SMS_5
。
optionally, the first sampling voltage V s1 And a second sampling voltage V s2 An inverting input terminal of the first comparator COM1 and a non-inverting input terminal of the second comparator COM2 are respectively input, and the non-inverting input terminal of the first comparator COM1 and the inverting input terminal of the second comparator COM2 are connected with a reference voltage V REF When V s1 <V REF Or V REF <V s2 The output V of the first OR gate U1 x Is high.
When the output V of the first OR gate U1 x When the voltage is high, the acceleration switch tube Mx is conducted, and the acceleration current source I sx In the access control circuit, thereby increasing the current source size to I s +I sx The adjusting speed of the control loop is increased.
In particular, when V s1 <V REF When, i.e
Figure SMS_6
Both sides are simultaneously multiplied by
Figure SMS_7
Is available in the form of
Figure SMS_8
Can be obtained
Figure SMS_9
. Thus, when V s1 <V REF Corresponding to the instantaneous value V of the output voltage OUT Is smaller than the normal value V of the output voltage OUTP Is->
Figure SMS_10
At the time, the output V of the first comparator COM1 c1 To a high level, at this time, the output V of the first OR gate U1 x Also becomes high level, accelerates the switch tube Mx to be conducted, accelerates the current source I sx Access to the control circuit to cause I 1 +I 2 The size of (2) is represented by I s Becomes I s +I sx The adjusting speed of the control loop is increased.
When V is REF <V s2 When, i.e
Figure SMS_11
Two sides are simultaneously taken with->
Figure SMS_12
Is available in the form of
Figure SMS_13
Can be obtained
Figure SMS_14
Can get->
Figure SMS_15
. Thus, when V REF <V s2 Corresponding to the instantaneous value V of the output voltage OUT Is larger than the normal value V of the output voltage OUTP Is->
Figure SMS_16
At the time, the output V of the second comparator COM2 c2 To a high level, at this time, the output V of the first OR gate U1 x Also becomes high level, speeding up the switching tube Mx is conducted, and current source I is accelerated sx Access to the control circuit to cause I 1 +I 2 The size of (2) is represented by I s Becomes I s +I sx The adjusting speed of the control loop is increased.
Optionally, the output end of the main power switch tube Mp also passes through an output filter capacitor C L Grounding may make the output smoother.
Optionally, the first switching tube, the second switching tube and the accelerating switching tube may be NMOS tubes or NPN triodes.
Optionally, the third switching tube, the fourth switching tube and the main power switching tube may be PMOS tubes or PNP triodes.
Optionally, the sizes of the four voltage dividing resistors can be adjusted according to actual needs so as to control the fluctuation voltage of the output voltage.
In summary, in a battery power supply scenario, a control loop accelerating circuit is provided, where the control loop accelerating circuit includes an accelerating switch tube, an accelerating current source, a main power switch tube, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube and a first current source; the input end of the main power switching tube is connected with the power supply voltage end, and the output end of the main power switching tube is connected with the output voltage end; the output end of the main power switching tube is also connected to a first node through a first voltage dividing circuit; the first node is grounded through a second voltage dividing circuit; the power supply voltage end is connected to the second node through a third switching tube and a first switching tube in sequence; the power supply voltage end is also connected to a third node through a fourth switching tube; the third node is connected to the second node through a second switching tube; the third switching tube and the fourth switching tube form a current mirror structure; the third node is connected to the control end of the main power switch tube; the first node is connected to the control end of the first switching tube; the control end of the second switching tube is connected with a reference voltage; the second node is grounded through a first current source; the second node is grounded through an acceleration switch tube and an acceleration current source in turn; the control end of the acceleration switch tube is connected with the output end of the voltage comparison unit; the voltage comparison unit is used for comparing whether the voltage of the output voltage terminal belongs to a designated voltage interval or not, and outputting a high level when the voltage does not belong to the designated voltage interval.
In a battery power supply scene, when output current suddenly changes to cause excessive or insufficient output voltage, the control loop accelerating circuit can compare whether the voltage of the output voltage end belongs to a designated voltage interval or not through the voltage comparing unit, and when the voltage does not belong to the designated voltage interval, the control accelerating switching tube is controlled to be conducted so as to improve the regulating speed of the output voltage, the fluctuation voltage of the output voltage is controlled in a reasonable range, the reliability of the battery power supply circuit is further improved, and the safety of an electric load is ensured.
Because the accelerating switch tube is not conducted when the voltage of the output voltage end belongs to the appointed voltage interval, and the accelerating switch tube is conducted when the voltage of the output voltage end does not belong to the appointed voltage interval, the circuit is in a low power consumption state when the regulation speed of the control loop is not required to be accelerated, the acceleration of the regulation speed of the control loop and the output voltage is realized when the regulation speed of the control loop is required to be accelerated, and the circuit power consumption and the regulation speed are balanced.
In the circuit structure, the fluctuation voltage of the output voltage can be controlled by adjusting the parameters of each voltage dividing resistor.
The circuit of the application also compares the sampled output voltage with the reference voltage without additionally increasing fixed voltage, thereby reducing the circuit volume; when the circuit is in different applications, namely when the normal value of the output voltage is different in the steady state of the circuit, the required reference voltage is also different, but because the sampling voltage value and the reference voltage in the circuit are in a proportional relation, the output voltage can be controlled with the same control precision no matter how the reference voltage changes, so that the control precision and the application range of the circuit are greatly improved; the temperature coefficient of each sampling voltage and the temperature coefficient of the reference voltage in the circuit are the same, so that the control signal output by the voltage comparison unit is not affected by temperature, and the control precision of the circuit is further improved.
Referring to fig. 4, a schematic diagram of a control loop acceleration circuit is shown according to an exemplary embodiment. Fig. 4 is a circuit configuration obtained by adding hysteresis control to the control loop acceleration circuit shown in fig. 3, and the circuit configuration is as follows:
the first voltage dividing node passes through the second voltage dividing resistor R f1b Connected to the third voltage dividing node; the third voltage dividing node passes through a fifth voltage dividing resistor R f1c Connected to the first node;
the second voltage dividing node passes through the fourth voltage dividing resistor R f2b Connected to the fourth voltage dividing node; the fourth voltage dividing node passes through a sixth voltage dividing resistor R f2c Grounding;
the third voltage division node is also connected to the first node through a fifth switching tube Mc 1; the control end of the fifth switching tube Mc1 is connected with the output end of the first comparator COM 1;
the fourth voltage division node is grounded through a sixth switching tube Mc 2; the output end of the second comparator COM2 is connected to the control end of the sixth switching tube Mc2 through the not gate U2.
The control loop acceleration circuit shown in fig. 4 operates as follows:
when the output voltage is normal, the output V of the first comparator COM1 c1 And the output V of the second comparator COM2 c2 All are low level, and the control terminal voltage V of the sixth switching tube Mc2 c3 Is V (V) c2 After inversion, so V c3 Is high.
At this time, the fifth switching tube Mc1 is turned off, and the fifth voltage dividing resistor R f1c The access circuit, the sixth switching tube Mc2 is conducted, and the sixth voltage dividing resistor R f2c Being shorted, the control circuit may be equivalent to the circuit shown in fig. 5.
FIG. 5 is a schematic diagram showing an equivalent structure of a control loop acceleration circuit for controlling a normal output voltage according to an embodiment of the present application, as shown in FIG. 5
Figure SMS_17
。
When V is s1 <V REF When, i.e. when
Figure SMS_18
At the time, the output V of the first comparator COM1 c1 To become high level, the output V of the first OR gate U1 x Is at high level, accelerates the conduction of the switch tube Mx and accelerates the current source I sx The control circuit is connected into the control circuit, and the control circuit starts to adjust the output voltage in an accelerating way. Meanwhile, due to the output V of the first comparator COM1 c1 When the voltage goes high, the fifth switching transistor Mc1 is turned on, and the fifth voltage dividing resistor R f1c Being shorted, the control circuit may be equivalent to the circuit shown in fig. 6.
Fig. 6 is a schematic diagram showing an equivalent structure of a control loop acceleration circuit when the output voltage is too low according to the embodiment of the present application. As shown in fig. 6, the output V of the first comparator COM1 is caused to c1 The condition for going low again is V s1 ＞V REF 。
Due to
Figure SMS_19
，/>
Figure SMS_20
，
Figure SMS_21
Can properly V s1 ＞V REF In the time-course of which the first and second contact surfaces,
Figure SMS_22
。
at this time, due to
Figure SMS_23
Can be obtained
Figure SMS_24
Therefore, the method can be used for manufacturing the optical fiber,
Figure SMS_25
。
from the above analysis, when the output voltage is too low, the control circuit needs to accelerate the output voltage to rise to a value larger than that
Figure SMS_26
Specifically +.>
Figure SMS_27
The acceleration switch tube Mx is turned off at the voltage value of (a).
When V is s2 ＞V REF When, i.e. when
Figure SMS_28
At the time, the output V of the second comparator COM2 c2 To become high level, the output V of the first OR gate U1 x Is at high level, accelerates the conduction of the switch tube Mx and accelerates the current source I sx The control circuit is connected into the control circuit, and the control circuit starts to adjust the output voltage in an accelerating way. At the same time, due to the output V of the second comparator COM2 c2 To become high level, the control terminal voltage V of the sixth switching tube Mc2 c3 At low level, the sixth switching tube Mc2 is turned off, and the sixth voltage dividing resistor R f2c In the access control circuit, the control circuit may be equivalent to the circuit shown in fig. 7.
Fig. 7 is a schematic diagram showing an equivalent structure of a control loop acceleration circuit when the output voltage is too high according to an embodiment of the present application. As shown in fig. 7, the output V of the second comparator COM2 is caused to c2 The condition for going low again is V s2 <V REF 。
Due to
Figure SMS_29
，/>
Figure SMS_30
，
Figure SMS_31
Can properly V s2 <V REF In the time-course of which the first and second contact surfaces,
Figure SMS_32
。
at this time, due to
Figure SMS_33
Can be obtained
Figure SMS_34
Therefore, the method can be used for manufacturing the optical fiber,
Figure SMS_35
。
from the above analysis, when the output voltage is too high, the control circuit needs to accelerate to reduce the output voltage to be smaller than a value
Figure SMS_36
Specifically +.>
Figure SMS_37
The acceleration switch tube Mx is turned off at the voltage value of (a).
For example, when the output voltage decreases below 1.6V, V c1 The regulating speed of the control circuit is increased until the output voltage is increased to 1.8V, and the control circuit is restored to the regulating speed in normal operation; when the output voltage rises to 2.4V, V c2 The regulation speed of the control circuit increases until the output voltage decreases to 2.2V, after which the control circuit returns to the regulation speed in normal operation.
Therefore, by adding the hysteresis control, the reliability of the control circuit is improved, and the output voltage ripple is reduced.
In summary, in a battery power supply scenario, a control loop accelerating circuit is provided, where the control loop accelerating circuit includes an accelerating switch tube, an accelerating current source, a main power switch tube, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube and a first current source; the input end of the main power switching tube is connected with the power supply voltage end, and the output end of the main power switching tube is connected with the output voltage end; the output end of the main power switching tube is also connected to a first node through a first voltage dividing circuit; the first node is grounded through a second voltage dividing circuit; the power supply voltage end is connected to the second node through a third switching tube and a first switching tube in sequence; the power supply voltage end is also connected to a third node through a fourth switching tube; the third node is connected to the second node through a second switching tube; the third switching tube and the fourth switching tube form a current mirror structure; the third node is connected to the control end of the main power switch tube; the first node is connected to the control end of the first switching tube; the control end of the second switching tube is connected with a reference voltage; the second node is grounded through a first current source; the second node is grounded through an acceleration switch tube and an acceleration current source in turn; the control end of the acceleration switch tube is connected with the output end of the voltage comparison unit; the voltage comparison unit is used for comparing whether the voltage of the output voltage terminal belongs to a designated voltage interval or not, and outputting a high level when the voltage does not belong to the designated voltage interval.
In a battery power supply scene, when output current suddenly changes to cause excessive or insufficient output voltage, the control loop accelerating circuit can compare whether the voltage of the output voltage end belongs to a designated voltage interval or not through the voltage comparing unit, and when the voltage does not belong to the designated voltage interval, the control accelerating switching tube is controlled to be conducted so as to improve the regulating speed of the output voltage, the fluctuation voltage of the output voltage is controlled in a reasonable range, the reliability of the battery power supply circuit is further improved, and the safety of an electric load is ensured.
Because the accelerating switch tube is not conducted when the voltage of the output voltage end belongs to the appointed voltage interval, and the accelerating switch tube is conducted when the voltage of the output voltage end does not belong to the appointed voltage interval, the circuit is in a low power consumption state when the regulation speed of the control loop is not required to be accelerated, the acceleration of the regulation speed of the control loop and the output voltage is realized when the regulation speed of the control loop is required to be accelerated, and the circuit power consumption and the regulation speed are balanced.
In the circuit structure, the fluctuation voltage of the output voltage can be controlled by adjusting the parameters of each voltage dividing resistor.
The circuit of the application also compares the sampled output voltage with the reference voltage without additionally increasing fixed voltage, thereby reducing the circuit volume; when the circuit is in different applications, namely when the normal value of the output voltage is different in the steady state of the circuit, the required reference voltage is also different, but because the sampling voltage value and the reference voltage in the circuit are in a proportional relation, the output voltage can be controlled with the same control precision no matter how the reference voltage changes, so that the control precision and the application range of the circuit are greatly improved; the temperature coefficient of each sampling voltage and the temperature coefficient of the reference voltage in the circuit are the same, so that the control signal output by the voltage comparison unit is not affected by temperature, and the control precision of the circuit is further improved.
Further, fig. 8 shows a schematic structural diagram of a battery power supply circuit according to an embodiment of the present application. As shown in fig. 8, the battery powered circuit includes the control loop acceleration circuit described above.
In the battery power supply circuit, an acceleration switch tube Mx and an acceleration current source I sx Main power switch tube M p A first switching tube M1, a second switching tube M2, a third switching tube M3, a fourth switching tube M4 and a first current source I s And the voltage comparison unit is positioned inside the main control chip U3.
The first voltage dividing circuit and the second voltage dividing circuit are located outside the main control chip U3.
The main control chip U3 includes a voltage output pin V OUT1 A first sampling pin fb1; the voltage output pin V OUT1 Sequentially connected to the first node through a first voltage dividing circuit; the first node is connected to the first sampling pin fb1.
As shown in fig. 8, in one possible implementation, the circuit further includes a target battery E1 and an input filter capacitor C1; the main control chip U3 includes a supply voltage pin VDD1.
The power supply voltage pin VDD1 is grounded through the input filter capacitor C1.
The power supply voltage pin VDD1 is connected to the positive electrode of the target battery E1; the negative electrode of the target battery E1 is grounded.
As shown in fig. 8, in one possible implementation, the main control chip U3 includes a second sampling pin V s1a Third sampling pin V s2a The method comprises the steps of carrying out a first treatment on the surface of the The second sampling pin V s1a The first voltage division node is connected with a first voltage division node in the first voltage division circuit; the third sampling pin V s2a Is connected with a second voltage division node in the second voltage division circuit.
In fig. 8, F1 represents a load, and GND1 represents a ground pin.
In the battery power supply circuit shown in fig. 8, the circuit structure shown in fig. 3 is implemented through the main control chip U3 and the external circuit thereof, so that the battery power supply circuit shown in fig. 8 can also implement the function corresponding to the circuit structure shown in fig. 3 (when the output current suddenly changes to cause the output voltage to be too high or too low, the adjustment speed of the output voltage is increased), which is not described herein again.
Optionally, on the basis that the main control chip U3 and the external circuit together form a circuit structure equivalent to that shown in fig. 3, in this embodiment of the present application, a fifth voltage dividing resistor, a sixth voltage dividing resistor, a fifth switching tube, a sixth switching tube and a non-gate may be further added to the external circuit, and the above components are connected in a manner shown in fig. 4, so that the main control chip U3 and a battery power supply circuit formed by the external circuit added with the components may implement a function corresponding to that shown in fig. 4, which is not repeated herein.
In summary, a control loop accelerating circuit is provided in the battery power supply circuit, and the control loop accelerating circuit includes an accelerating switch tube, an accelerating current source, a main power switch tube, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube and a first current source; the input end of the main power switching tube is connected with the power supply voltage end, and the output end of the main power switching tube is connected with the output voltage end; the output end of the main power switching tube is also connected to a first node through a first voltage dividing circuit; the first node is grounded through a second voltage dividing circuit; the power supply voltage end is connected to the second node through a third switching tube and a first switching tube in sequence; the power supply voltage end is also connected to a third node through a fourth switching tube; the third node is connected to the second node through a second switching tube; the third switching tube and the fourth switching tube form a current mirror structure; the third node is connected to the control end of the main power switch tube; the first node is connected to the control end of the first switching tube; the control end of the second switching tube is connected with a reference voltage; the second node is grounded through a first current source; the second node is grounded through an acceleration switch tube and an acceleration current source in turn; the control end of the acceleration switch tube is connected with the output end of the voltage comparison unit; the voltage comparison unit is used for comparing whether the voltage of the output voltage terminal belongs to a designated voltage interval or not, and outputting a high level when the voltage does not belong to the designated voltage interval. Through the circuit structure, in a battery power supply scene, when the output current suddenly changes to cause the output voltage to be too large or too small, the control loop accelerating circuit can compare whether the voltage of the output voltage end belongs to a designated voltage interval or not through the voltage comparison unit, and when the voltage does not belong to the designated voltage interval, the control accelerating switching tube is controlled to be conducted so as to improve the regulating speed of the output voltage, the fluctuation voltage of the output voltage is controlled within a reasonable range, the reliability of the battery power supply circuit is further improved, and the safety of an electric load is ensured.
Because the accelerating switch tube is not conducted when the voltage of the output voltage end belongs to the appointed voltage interval, and the accelerating switch tube is conducted when the voltage of the output voltage end does not belong to the appointed voltage interval, the circuit is in a low power consumption state when the regulation speed of the control loop is not required to be accelerated, the acceleration of the regulation speed of the control loop and the output voltage is realized when the regulation speed of the control loop is required to be accelerated, and the circuit power consumption and the regulation speed are balanced.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It is to be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (9)

1. The control loop accelerating circuit is characterized by comprising an accelerating switch tube, an accelerating current source, a main power switch tube, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube and a first current source;
the input end of the main power switching tube is connected with a power supply voltage end, and the output end of the main power switching tube is connected with an output voltage end; the output end of the main power switch tube is also connected to a first node through a first voltage dividing circuit; the first node is grounded through a second voltage dividing circuit;
the power supply voltage end is connected to the second node through a third switching tube and the first switching tube in sequence; the power supply voltage end is also connected to a third node through a fourth switching tube; the third node is connected to the second node through a second switching tube; the third switching tube and the fourth switching tube form a current mirror structure; the third node is connected to the control end of the main power switching tube; the first node is connected to the control end of the first switching tube; the control end of the second switching tube is connected with a reference voltage;
the second node is grounded through a first current source; the second node is grounded through an acceleration switch tube and an acceleration current source in turn;
The control end of the acceleration switch tube is connected with the output end of the voltage comparison unit; the voltage comparison unit is used for comparing whether the voltage of the output voltage terminal belongs to a designated voltage interval or not, and outputting a high level when the voltage does not belong to the designated voltage interval;
the first voltage dividing circuit comprises a first voltage dividing resistor; the second voltage dividing circuit comprises a third voltage dividing resistor;
the output end of the main power switching tube is connected to a first voltage division node through a first voltage division resistor;
the first node is connected to a second voltage division node through a third voltage division resistor;
the voltage comparison unit comprises a first comparator, a second comparator and a first OR logic gate;
the output end of the first comparator and the output end of the second comparator are respectively connected to two input ends of a first OR logic gate; the output end of the first OR logic gate is connected to the control end of the acceleration switch tube;
the non-inverting input end of the first comparator and the inverting input end of the second comparator are connected with reference voltage; the inverting input end of the first comparator is connected with a first voltage division node; and the non-inverting input end of the second comparator is connected with the second voltage division node.
2. The control loop acceleration circuit of claim 1, wherein the first voltage divider circuit further comprises a second voltage divider resistor; the second voltage dividing circuit further comprises a fourth voltage dividing resistor;
The first voltage division node is connected to the first node through the second voltage division resistor; and the second voltage division node is grounded through the fourth voltage division resistor.
3. The control loop acceleration circuit of claim 2, wherein the first voltage dividing node is connected to a third voltage dividing node through the second voltage dividing resistor; the third voltage division node is connected to the first node through a fifth voltage division resistor;
the second voltage division node is connected to a fourth voltage division node through the fourth voltage division resistor; the fourth voltage division node is grounded through a sixth voltage division resistor;
the third voltage division node is also connected to the first node through a fifth switching tube; the control end of the fifth switching tube is connected with the output end of the first comparator;
the fourth voltage division node is grounded through a sixth switch tube; the output end of the second comparator is connected to the control end of the sixth switching tube through a NOT gate.
4. A control loop acceleration circuit according to any one of the claims 1-3, characterized in, that the output of the main power switching tube is further connected to ground via an output filter capacitor.
5. A control loop acceleration circuit according to any one of the claims 1-3, characterized in, that the first, second and acceleration switching tubes are NMOS tubes;
Or the first switching tube, the second switching tube and the accelerating switching tube are NPN triodes.
6. A control loop acceleration circuit according to any one of claims 1 to 3, characterized in, that the third switching tube, the fourth switching tube and the main power switching tube are PMOS tubes;
or the third switching tube, the fourth switching tube and the main power switching tube are PNP triodes.
7. A battery powered circuit comprising the control loop acceleration circuit of any one of claims 1 to 6;
in the battery power supply circuit, an acceleration switch tube, an acceleration current source, a main power switch tube, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first current source and a voltage comparison unit are positioned in a main control chip;
the first voltage dividing circuit and the second voltage dividing circuit are positioned outside the main control chip;
the main control chip comprises a voltage output pin and a first sampling pin; the voltage output pin is connected to the first node through a first voltage dividing circuit in sequence; the first node is connected to the first sampling pin.
8. The battery powered circuit of claim 7, wherein the circuit further comprises a target battery and an input filter capacitor; the main control chip comprises a power supply voltage pin;
The power supply voltage pin is grounded through the input filter capacitor;
the power supply voltage pin is connected to the anode of the target battery; the negative electrode of the target battery is grounded.
9. The battery powered circuit of claim 7, wherein the main control chip includes a second sampling pin and a third sampling pin; the second sampling pin is connected with a first voltage division node in the first voltage division circuit; and the third sampling pin is connected with a second voltage division node in the second voltage division circuit.
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