CN112578839A - Voltage stabilizing module and electronic device - Google Patents
Voltage stabilizing module and electronic device Download PDFInfo
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- CN112578839A CN112578839A CN202011560166.0A CN202011560166A CN112578839A CN 112578839 A CN112578839 A CN 112578839A CN 202011560166 A CN202011560166 A CN 202011560166A CN 112578839 A CN112578839 A CN 112578839A
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- 230000033228 biological regulation Effects 0.000 claims abstract description 17
- 238000004146 energy storage Methods 0.000 claims description 35
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 14
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- 239000010409 thin film Substances 0.000 description 3
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/563—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices including two stages of regulation at least one of which is output level responsive, e.g. coarse and fine regulation
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Abstract
The invention provides a voltage stabilizing module and an electronic device. The voltage stabilizing module comprises a voltage output end, a control circuit, a digital voltage stabilizing circuit and an analog voltage stabilizing circuit; the control circuit provides a trigger signal for the digital voltage stabilizing circuit when the voltage stabilizing module is started, and is used for controlling the digital voltage stabilizing circuit to work and the analog voltage stabilizing circuit to not work when the output voltage is less than a first voltage or greater than a second voltage, and controlling the analog voltage stabilizing circuit to work and the digital voltage stabilizing circuit to not work when the output voltage is greater than the first voltage and less than the second voltage; the digital voltage stabilizing circuit controls and increases the output voltage after receiving the trigger signal, and controls and adjusts the output voltage when being controlled by the control circuit to work, so that the absolute value of the difference between the output voltage and the reference voltage is reduced; when the analog voltage stabilizing circuit works under the control of the control circuit, the output voltage is regulated to the reference voltage. The invention can not only improve the voltage regulation speed, but also ensure the voltage regulation precision.
Description
Technical Field
The present invention relates to the field of voltage stabilization technologies, and in particular, to a voltage stabilization module and an electronic device.
Background
As SoC chips (system on chip) become more complex, larger in size and higher in power consumption, low dropout regulators (LDO) are required to provide a simple, low power, fast, and clean internal voltage source.
The analog LDO has a higher bandwidth and a better PSR (Primary Switching Regulator), but has a smaller operating range; digital LDOs have a larger operating range but have a larger output noise.
Disclosure of Invention
The invention mainly aims to provide a voltage stabilizing module and an electronic device, and solves the problem that the conventional voltage stabilizing module cannot give consideration to both voltage regulation speed and voltage regulation precision.
In order to achieve the above object, the present invention provides a voltage stabilizing module, which comprises a voltage output terminal, a control circuit, a digital voltage stabilizing circuit and an analog voltage stabilizing circuit,
the control circuit is respectively electrically connected with the voltage output end, the digital voltage stabilizing circuit and the analog voltage stabilizing circuit, and is used for providing a trigger signal for the digital voltage stabilizing circuit when the voltage stabilizing module is started, and controlling the digital voltage stabilizing circuit to work and the analog voltage stabilizing circuit to not work when the output voltage provided by the voltage output end is less than a first voltage or more than a second voltage, and controlling the analog voltage stabilizing circuit to work and the digital voltage stabilizing circuit to not work when the output voltage is more than the first voltage and less than the second voltage;
the digital voltage stabilizing circuit is electrically connected with the voltage output end, is used for controlling and increasing the output voltage after receiving the trigger signal, and is used for controlling and adjusting the output voltage when being controlled by the control circuit to work so as to reduce the absolute value of the difference value between the output voltage and the reference voltage;
the analog voltage stabilizing circuit is electrically connected with the voltage output end and is used for adjusting the output voltage to the reference voltage when the analog voltage stabilizing circuit is controlled by the control circuit to work;
the reference voltage is greater than the first voltage and less than the second voltage.
Optionally, the control circuit is further configured to provide a first turn-on control signal to the digital voltage stabilizing circuit when the output voltage is less than a first voltage or greater than a second voltage, and provide a first turn-off control signal to the analog voltage stabilizing circuit through the voltage stabilizing control terminal, and further configured to provide a second turn-off control signal to the digital voltage stabilizing circuit when the output voltage is greater than the first voltage and less than the second voltage, and provide a second turn-on control signal to the analog voltage stabilizing circuit through the voltage stabilizing control terminal;
the digital voltage stabilizing circuit is further used for controlling to increase the output voltage when the output voltage is judged to be smaller than a preset reference voltage when the first turn-on control signal is received, controlling to decrease the output voltage when the output voltage is judged to be larger than the reference voltage, and stopping working when the second turn-off control signal is received;
the analog voltage stabilizing circuit is further configured to regulate the output voltage to the reference voltage when receiving the second turn-on control signal, and to stop working when receiving the first turn-off control signal.
Optionally, the digital voltage stabilizing circuit includes an analog-to-digital conversion unit, a charging control unit, and an energy storage unit;
the analog-to-digital conversion unit is respectively electrically connected with the control circuit, the voltage output end and the charging control unit, and is used for comparing the output voltage with the reference voltage when receiving the trigger signal or the first starting control signal, providing a first charging control signal to the charging control unit when the output voltage is smaller than the reference voltage, and providing a first charging stopping control signal to the charging control unit when the output voltage is larger than the reference voltage;
the charging control unit is respectively electrically connected with the charging voltage end and the energy storage unit and used for controlling the charging voltage end to be communicated with the energy storage unit when receiving the first charging control signal, so that the charging voltage signal provided by the charging voltage end is used for charging the energy storage unit, and the charging control unit is used for controlling the charging voltage end to be disconnected with the energy storage unit when receiving the first charging stop control signal.
Optionally, the analog-to-digital conversion unit includes an N-bit analog-to-digital converter; n is a positive integer; the first charge control signal comprises N first control signals;
the N-bit analog-to-digital converter is respectively electrically connected with the voltage output end, the reference voltage end and the charging control unit and is used for outputting the N first control signals to the charging control unit according to the output voltage and the reference voltage so as to control the connection or disconnection between the charging voltage end and the energy storage unit;
the reference voltage terminal is used for providing a reference voltage.
Optionally, the N-bit analog-to-digital converter is a successive approximation register analog-to-digital converter.
Optionally, the charge control unit includes N charge control transistors;
a control electrode of the nth charging control transistor is connected with the nth first control signal, a first electrode of the nth charging control transistor is electrically connected with the charging voltage end, and a second electrode of the nth charging control transistor is electrically connected with the energy storage unit;
n is a positive integer less than or equal to N.
Optionally, the energy storage unit includes a storage capacitor;
the first end of the storage capacitor is electrically connected with the voltage output end, and the second end of the storage capacitor is electrically connected with the ground end.
Optionally, the analog voltage stabilizing circuit includes an operational amplifier, a first control transistor and a second control transistor;
a first input end of the operational amplifier is electrically connected with the voltage output end, a second input end of the operational amplifier is connected with a reference voltage, and an output end of the operational amplifier is electrically connected with a control electrode of the second control transistor;
the control electrode of the first control transistor is electrically connected with the voltage stabilization control end, the first electrode of the first control transistor is electrically connected with the third voltage end, and the second electrode of the first control transistor is electrically connected with the control electrode of the second control transistor;
the first electrode of the second control transistor is electrically connected with the fourth voltage end, and the second electrode of the second control transistor is electrically connected with the energy storage unit.
Optionally, the control circuit includes a control unit, a first comparator and a second comparator;
the first comparator is electrically connected with the voltage output end, is connected with a first voltage, and is used for comparing the output voltage with the first voltage and transmitting an obtained first comparison result to the control unit;
the second comparator is electrically connected with the voltage output end and is connected with a second voltage, and the second comparator is used for comparing the output voltage with the second voltage and transmitting an obtained second comparison result to the control unit;
the control unit is respectively and electrically connected with the first comparator, the second comparator, the digital voltage stabilizing circuit and the analog voltage stabilizing circuit, the digital voltage stabilizing circuit is used for providing a trigger signal for the digital voltage stabilizing circuit when the voltage stabilizing module is started, and providing a first starting control signal for the digital voltage stabilizing circuit when the output voltage is less than a first voltage or more than a second voltage according to the first comparison result and the second comparison result, providing a first turn-off control signal to the analog voltage stabilizing circuit through the voltage stabilizing control end, and when the output voltage is obtained to be greater than the first voltage and less than the second voltage according to the first comparison result and the second comparison result, and providing a second turn-off control signal for the digital voltage stabilizing circuit, and providing a second turn-on control signal for the analog voltage stabilizing circuit through the voltage stabilizing control end.
Optionally, the control unit is a finite state machine.
The invention also provides an electronic device comprising the voltage stabilizing module.
After the voltage stabilizing module and the electronic device are started, the control circuit firstly controls the digital voltage stabilizing circuit to coarsely adjust the output voltage, and the adjustment speed can be improved due to the high adjustment speed of the digital voltage stabilizing circuit; when the output voltage is greater than the first voltage and less than the second voltage, the control circuit controls the digital voltage stabilizing circuit to stop working so as to save power; the control circuit controls the analog voltage stabilizing circuit to perform fine adjustment on the output voltage so as to adjust the output voltage to a reference voltage and keep the output voltage at the reference voltage. By adopting the voltage stabilizing module provided by the embodiment of the invention, the voltage adjusting speed can be increased, and the voltage adjusting precision can be ensured.
Drawings
Fig. 1 is a structural diagram of a voltage stabilizing module according to an embodiment of the present invention;
fig. 2 is a structural diagram of a voltage regulator module according to another embodiment of the invention;
fig. 3 is a structural diagram of a voltage regulator module according to another embodiment of the invention;
fig. 4 is a structural diagram of a voltage regulator module according to still another embodiment of the present invention;
fig. 5 is a circuit diagram of a voltage stabilizing module according to an embodiment of the invention;
fig. 6 is a simulation operation timing diagram of the embodiment of the voltage stabilizing module shown in fig. 5.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The transistors used in all embodiments of the present invention may be transistors, thin film transistors, or field effect transistors or other devices with the same characteristics. In the embodiment of the present invention, in order to distinguish two poles of the transistor except the control pole, one pole is called a first pole, and the other pole is called a second pole.
In practical operation, when the transistor is a triode, the control electrode may be a base electrode, the first electrode may be a collector electrode, and the second electrode may be an emitter electrode; alternatively, the control electrode may be a base electrode, the first electrode may be an emitter electrode, and the second electrode may be a collector electrode.
In practical operation, when the transistor is a thin film transistor or a field effect transistor, the control electrode may be a gate electrode, the first electrode may be a source electrode, and the second electrode may be a drain electrode; alternatively, the control electrode may be a gate electrode, the first electrode may be a drain electrode, and the second electrode may be a source electrode.
The voltage stabilizing module of the embodiment of the invention comprises a voltage output end, a control circuit, a digital voltage stabilizing circuit and an analog voltage stabilizing circuit, wherein,
the control circuit is respectively electrically connected with the voltage output end, the digital voltage stabilizing circuit and the analog voltage stabilizing circuit, and is used for providing a trigger signal for the digital voltage stabilizing circuit when the voltage stabilizing module is started, and controlling the digital voltage stabilizing circuit to work and the analog voltage stabilizing circuit to not work when the output voltage provided by the voltage output end is less than a first voltage or more than a second voltage, and controlling the analog voltage stabilizing circuit to work and the digital voltage stabilizing circuit to not work when the output voltage is more than the first voltage and less than the second voltage;
the digital voltage stabilizing circuit is electrically connected with the voltage output end, is used for controlling and increasing the output voltage after receiving the trigger signal, and is used for controlling and adjusting the output voltage when being controlled by the control circuit to work so as to reduce the absolute value of the difference value between the output voltage and the reference voltage;
the analog voltage stabilizing circuit is electrically connected with the voltage output end and is used for adjusting the output voltage to the reference voltage when the analog voltage stabilizing circuit is controlled by the control circuit to work;
the reference voltage is greater than the first voltage and less than the second voltage.
After the voltage stabilizing module is started, the control circuit firstly controls the digital voltage stabilizing circuit to carry out coarse adjustment on the output voltage, and the adjustment speed can be improved due to the high adjustment speed of the digital voltage stabilizing circuit; when the output voltage is greater than the first voltage and less than the second voltage, the control circuit controls the digital voltage stabilizing circuit to stop working so as to save power; the control circuit controls the analog voltage stabilizing circuit to perform fine adjustment on the output voltage so as to adjust the output voltage to a reference voltage and keep the output voltage at the reference voltage. By adopting the voltage stabilizing module provided by the embodiment of the invention, the voltage adjusting speed can be increased, and the voltage adjusting precision can be ensured.
Optionally, the control circuit is further configured to provide a first turn-on control signal to the digital voltage stabilizing circuit when the output voltage is less than a first voltage or greater than a second voltage, and provide a first turn-off control signal to the analog voltage stabilizing circuit through the voltage stabilizing control terminal, and further configured to provide a second turn-off control signal to the digital voltage stabilizing circuit when the output voltage is greater than the first voltage and less than the second voltage, and provide a second turn-on control signal to the analog voltage stabilizing circuit through the voltage stabilizing control terminal;
the digital voltage stabilizing circuit is further used for controlling to increase the output voltage when the output voltage is judged to be smaller than a preset reference voltage when the first turn-on control signal is received, controlling to decrease the output voltage when the output voltage is judged to be larger than the reference voltage, and stopping working when the second turn-off control signal is received;
the analog voltage stabilizing circuit is further configured to regulate the output voltage to the reference voltage when receiving the second turn-on control signal, and to stop working when receiving the first turn-off control signal.
As shown in fig. 1, the voltage regulation module according to the embodiment of the present invention includes a voltage output terminal Out, a control circuit 11, a digital regulation circuit 12 and an analog regulation circuit 13, wherein,
the control circuit 11 is electrically connected to the voltage output terminal Out, the digital voltage stabilizing circuit 12 and the analog voltage stabilizing circuit 13, and is configured to provide a trigger signal to the digital voltage stabilizing circuit 12 when the voltage stabilizing module is started, provide a first turn-on control signal to the digital voltage stabilizing circuit 12 when an output voltage Vout provided by the voltage output terminal Out is smaller than a first voltage or larger than a second voltage, provide a first turn-off control signal to the analog voltage stabilizing circuit 13 through a voltage stabilizing control terminal S0, provide a second turn-off control signal to the digital voltage stabilizing circuit 12 when the output voltage Vout is larger than the first voltage and smaller than the second voltage, and provide a second turn-on control signal to the analog voltage stabilizing circuit 13 through the voltage stabilizing control terminal S0;
the digital voltage stabilizing circuit 12 is electrically connected to the voltage output terminal Out, and is configured to control to increase the output voltage Vout after receiving the trigger signal, and to control to increase the output voltage Vout when determining that the output voltage Vout is smaller than a preset reference voltage, and to control to decrease the output voltage Vout when determining that the output voltage Vout is greater than the reference voltage, and to stop working when receiving the second off control signal;
the analog voltage stabilizing circuit 13 is electrically connected to the voltage output terminal Out, and is configured to regulate the output voltage Vout to the reference voltage when receiving the second turn-on control signal, and to stop working when receiving the first turn-off control signal.
In the embodiment shown in fig. 1, the control circuit 11 may also be connected to the first voltage VL and the second voltage VH, but is not limited thereto.
In the embodiment of the present invention, the reference voltage is between the first voltage and the second voltage, but not limited thereto.
When the voltage stabilizing module works, a trigger signal is provided for the digital voltage stabilizing circuit 12 when the voltage stabilizing module is started, and the digital voltage stabilizing circuit 12 controls to increase the output voltage Vout after receiving the trigger signal;
the control circuit 11 provides a first turn-on control signal to the digital voltage stabilizing circuit 12 when the output voltage Vout provided by the voltage output terminal Out is smaller than a first voltage or larger than a second voltage, and provides a first turn-off control signal to the analog voltage stabilizing circuit 13 through a voltage stabilizing control terminal S0, when the digital voltage stabilizing circuit 12 receives the first turn-on control signal, when the output voltage Vout is judged to be smaller than a preset reference voltage, the digital voltage stabilizing circuit controls to increase the output voltage Vout, and when the output voltage Vout is judged to be larger than the reference voltage, the digital voltage stabilizing circuit controls to decrease the output voltage Vout; the analog voltage stabilizing circuit 13 stops working when receiving the first turn-off control signal; that is, when the difference between the output voltage Vout and the reference voltage is large, that is, the output voltage Vout is smaller than the first voltage or larger than the second voltage, the control circuit 11 controls the digital voltage stabilizing circuit 12 to adjust the output voltage, and the control circuit 11 controls the analog voltage stabilizing circuit 13 to stop working;
when the output voltage Vout is greater than the first voltage and less than the second voltage, the control circuit 11 provides a second turn-off control signal to the digital voltage stabilizing circuit 12 and provides a second turn-on control signal to the analog voltage stabilizing circuit 13, the digital voltage stabilizing circuit 12 stops working when receiving the second turn-off control signal, and the analog voltage stabilizing circuit 13 adjusts the output voltage Vout to the reference voltage when receiving the second turn-on control signal.
When the voltage stabilizing module works, after the voltage stabilizing module is started, the control circuit 11 firstly controls the digital voltage stabilizing circuit 12 to carry out coarse adjustment on the output voltage, and the adjustment speed can be improved because the adjustment speed of the digital voltage stabilizing circuit 12 is high; when the output voltage Vout is greater than the first voltage and less than the second voltage, the control circuit 11 controls the digital voltage stabilizing circuit 12 to stop working, so as to save power; the control circuit 11 controls the analog voltage stabilizing circuit 13 to perform fine tuning on the output voltage Vout so as to adjust the output voltage Vout to a reference voltage and maintain Vout at the reference voltage. By adopting the voltage stabilizing module provided by the embodiment of the invention, the voltage adjusting speed can be increased, and the voltage adjusting precision can be ensured.
As shown in fig. 2, on the basis of the embodiment of the voltage stabilizing module shown in fig. 1, the digital voltage stabilizing circuit may include an analog-to-digital conversion unit 21, a charging control unit 22 and an energy storage unit 23; the energy storage unit 23 is electrically connected with the voltage output end Out;
the analog-to-digital conversion unit 21 is electrically connected to a voltage output terminal Out, the control circuit 11 and the charging control unit 22, respectively, the digital-to-analog conversion unit 21 is connected to a reference voltage Vref, the digital-to-analog conversion unit 21 is configured to compare the output voltage Vout with the reference voltage when receiving the trigger signal or the first start control signal, provide a first charging control signal to the charging control unit 22 when the output voltage Vout is smaller than the reference voltage, and provide a first charging stop control signal to the charging control unit 22 when the output voltage Vout is greater than the reference voltage;
the charging control unit 22 is electrically connected to the charging voltage terminal V1 and the energy storage unit 23, and is configured to control the charging voltage terminal V1 and the energy storage unit 23 to communicate with each other when receiving the first charging control signal, so as to charge the energy storage unit 23 by the charging voltage signal provided by the charging voltage terminal V1, and to control the charging voltage terminal V1 and the energy storage unit 23 to disconnect from each other when receiving the first charging stop control signal.
In the embodiment of the present invention, the charging voltage terminal V1 may be a positive voltage terminal, but is not limited thereto.
When the embodiment of the voltage stabilizing module shown in fig. 2 of the present invention is in operation, when the digital-to-analog conversion unit 21 receives the trigger signal or the first start control signal, the digital-to-analog conversion unit provides a first charge control signal or a first stop charge control signal to the charge control unit 22 according to Vout and the reference voltage; the charging control unit 22 controls the energy storage unit 23 to be charged by the charging voltage signal when receiving the first charging control signal, and controls the energy storage unit 23 to be stopped from being charged by the charging voltage signal when receiving the first charging stop control signal.
In a specific implementation, the analog-to-digital conversion unit may include an N-bit analog-to-digital converter; n is a positive integer; the first charge control signal comprises N first control signals;
the N-bit analog-to-digital converter is respectively electrically connected with the voltage output end, the reference voltage end and the charging control unit and is used for outputting the N first control signals to the charging control unit according to the output voltage and the reference voltage so as to control the connection or disconnection between the charging voltage end and the energy storage unit;
the reference voltage terminal is used for providing a reference voltage.
In the embodiment of the present invention, the N-bit analog-to-digital converter may be a SAR (successive approximation register type) analog-to-digital converter.
In an embodiment of the present invention, the analog-to-digital conversion unit may include an N-bit analog-to-digital converter, the N-bit analog-to-digital converter outputs N first control signals, and the charge control unit may include N charge control transistors, and the nth charge control transistor is controlled by the nth first control signal to be turned on or off.
Optionally, the charge control unit includes N charge control transistors;
a control electrode of the nth charging control transistor is connected with the nth first control signal, a first electrode of the nth charging control transistor is electrically connected with the charging voltage end, and a second electrode of the nth charging control transistor is electrically connected with the energy storage unit;
n is a positive integer less than or equal to N.
In the embodiment of the present invention, the N charging control transistors are of the same type, that is, the N charging control transistors are all p-type transistors, or the N charging control transistors are all N-type transistors.
In a specific implementation, when the analog-to-digital conversion unit may include an N-bit analog-to-digital converter, the N-bit analog-to-digital converter outputs N first control signals, the charge control unit includes N charge control transistors, and when the nth charge control transistor is controlled by the nth first control signal, when the N charge control transistors are p-type transistors, when the nth first control signal is a low voltage signal, the nth charge control transistor is turned on, and when the nth first control signal is a high voltage signal, the nth charge control transistor is turned off; when the N charge control transistors are N-type transistors, when the nth first control signal is a high voltage signal, the nth charge control transistor is turned on, and when the nth first control signal is a low voltage signal, the nth charge control transistor is turned off. In a specific implementation, the energy storage unit may include a storage capacitor;
the first end of the storage capacitor is electrically connected with the voltage output end, and the second end of the storage capacitor is electrically connected with the ground end.
In a specific implementation, the second terminal of the storage capacitor may be electrically connected to not only a ground terminal, but also another dc voltage terminal.
Optionally, the analog voltage stabilizing circuit includes an operational amplifier, a first control transistor and a second control transistor;
a first input end of the operational amplifier is electrically connected with the voltage output end, a second input end of the operational amplifier is connected with a reference voltage, and an output end of the operational amplifier is electrically connected with a control electrode of the second control transistor;
the control electrode of the first control transistor is electrically connected with the voltage stabilization control end, the first electrode of the first control transistor is electrically connected with the third voltage end, and the second electrode of the first control transistor is electrically connected with the control electrode of the second control transistor;
the first electrode of the second control transistor is electrically connected with the fourth voltage end, and the second electrode of the second control transistor is electrically connected with the energy storage unit. In the embodiment of the present invention, the third voltage terminal may be a positive voltage terminal, and the fourth voltage terminal may be a positive voltage terminal, but not limited thereto; the third voltage terminal may also be a negative voltage terminal, depending on the type of the second control transistor.
As shown in fig. 3, based on the embodiment of the voltage stabilizing module shown in fig. 2, the analog voltage stabilizing circuit may include an operational amplifier Amp, a first control transistor T1 and a second control transistor T2;
a first input end of the operational amplifier Amp is electrically connected with the voltage output end Out, a second input end of the operational amplifier Amp is connected with a reference voltage Vref, and an output end of the operational amplifier Amp is electrically connected with a gate of the second control transistor T2; the control end of the operational amplifier Amp is electrically connected with the voltage stabilization control end S0;
the gate of the first control transistor T1 is electrically connected to the regulated control terminal S0, the source of the first control transistor T1 is electrically connected to a third voltage terminal V3, and the drain of the first control transistor T1 is electrically connected to the gate of the second control transistor T2;
the source of the second control transistor T2 is electrically connected to the fourth voltage terminal V4, and the drain of the second control transistor T2 is electrically connected to the energy storage unit 23.
In the embodiment shown in fig. 3, T1 and T2 are both p-type tfts, but not limited thereto.
When the embodiment of the voltage stabilizing module shown in fig. 3 of the present invention is in operation, when the analog voltage stabilizing circuit operates, the control circuit 11 outputs a high voltage signal through S0, and turns off T1, when the output voltage Vout output by Out is greater than the reference voltage, Amp outputs a high voltage signal, and turns off T2, and stops charging the energy storage unit 23 through the fourth voltage signal provided by the fourth voltage terminal V4; when the Vout is smaller than the reference voltage, the Amp outputs a low voltage signal, T2 is started, and the energy storage unit 23 is charged through the fourth voltage signal to boost the Vout;
when the analog voltage stabilizing circuit does not work, the control circuit 11 outputs a low voltage signal through S0, the T1 is turned on, the grid of the T2 is communicated with the third voltage signal V3, and the T2 is turned off.
In particular implementation, the control circuit may include a control unit, a first comparator and a second comparator;
the first comparator is electrically connected with the voltage output end, is connected with a first voltage, and is used for comparing the output voltage with the first voltage and transmitting an obtained first comparison result to the control unit;
the second comparator is electrically connected with the voltage output end and is connected with a second voltage, and the second comparator is used for comparing the output voltage with the second voltage and transmitting an obtained second comparison result to the control unit;
the control unit is respectively and electrically connected with the first comparator, the second comparator, the digital voltage stabilizing circuit and the analog voltage stabilizing circuit, the digital voltage stabilizing circuit is used for providing a trigger signal for the digital voltage stabilizing circuit when the voltage stabilizing module is started, and providing a first starting control signal for the digital voltage stabilizing circuit when the output voltage is less than a first voltage or more than a second voltage according to the first comparison result and the second comparison result, providing a first turn-off control signal to the analog voltage stabilizing circuit through the voltage stabilizing control end, and when the output voltage is obtained to be greater than the first voltage and less than the second voltage according to the first comparison result and the second comparison result, and providing a second turn-off control signal for the digital voltage stabilizing circuit, and providing a second turn-on control signal for the analog voltage stabilizing circuit through the voltage stabilizing control end.
In the embodiment of the present invention, the control unit may be a Finite State Machine (FSM), but is not limited thereto.
As shown in fig. 4, on the basis of the embodiment of the voltage stabilization module shown in fig. 1, the control circuit may include a control unit 41, a first comparator 42 and a second comparator 43;
the first comparator 42 is electrically connected to the voltage output terminal Out, the first comparator 42 is connected to a first voltage VL, and the first comparator 42 is configured to compare the output voltage Vout with the first voltage and transmit an obtained first comparison result to the control unit 41; the first voltage value is the first voltage VL;
the second comparator 43 is electrically connected to the voltage output terminal Out, the second comparator 43 is connected to a second voltage VH, and the second comparator 43 is configured to compare the output voltage Vout with the second voltage and transmit an obtained second comparison result to the control unit 41;
the control unit 41 is electrically connected to the first comparator 42, the second comparator 43, the digital voltage regulator circuit 12 and the analog voltage regulator circuit 13, is used for providing a trigger signal to the digital voltage stabilizing circuit 12 when the voltage stabilizing module is started, and is used for providing a first starting control signal to the digital voltage stabilizing circuit 12 when the output voltage Vout is less than a first voltage or more than a second voltage according to the first comparison result and the second comparison result, the voltage regulation control terminal S0 is used for providing a first turn-off control signal to the analog voltage regulation circuit 13, and is further used for providing a second turn-off control signal to the digital voltage regulation circuit 12 when the output voltage Vout obtained according to the first comparison result and the second comparison result is greater than the first voltage and less than the second voltage, and providing a second starting control signal to the analog voltage stabilizing circuit 13 through the voltage stabilizing control terminal S0.
As shown in fig. 5, the voltage stabilizing module according to the embodiment of the present invention includes a voltage output terminal Out, a control circuit, a digital voltage stabilizing circuit, and an analog voltage stabilizing circuit, wherein,
the digital voltage stabilizing circuit comprises an analog-digital conversion unit, a charging control unit 22 and an energy storage unit;
the analog-to-digital conversion unit comprises a 3-bit SAR analog-to-digital converter 51; the energy storage unit comprises a storage capacitor Cout;
the charge control unit 22 includes a first charge control transistor M1, a second charge control transistor M2, and a third charge control transistor M3;
the gate of the first charge control transistor M1 is connected to the first control signal S1 output by the 3-bit SAR analog-to-digital converter 51, the source of the first charge control transistor M1 is electrically connected to the charging voltage terminal V1, and the drain of the first charge control transistor M1 is electrically connected to the first terminal of the storage capacitor Cout; the second end of the Cout is electrically connected with the ground end GND; the first end of the Cout is also electrically connected with a voltage output end Out;
the gate of the second charge control transistor M2 is connected to the second first control signal S2 output by the 3-bit SAR analog-to-digital converter 51, the source of the second charge control transistor M2 is electrically connected to the charging voltage terminal V1, and the drain of the second charge control transistor M2 is electrically connected to the first terminal of the storage capacitor Cout;
the gate of the third charge control transistor M3 is connected to the third first control signal S3 output by the 3-bit SAR analog-to-digital converter 51, the source of the third charge control transistor M3 is electrically connected to the charging voltage terminal V1, and the drain of the third charge control transistor M3 is electrically connected to the first terminal of the storage capacitor Cout;
the analog voltage stabilizing circuit comprises an operational amplifier Amp, a first control transistor T1 and a second control transistor T2;
a first input end of the operational amplifier Amp is electrically connected with the voltage output end Out, a second input end of the operational amplifier Amp is connected with a reference voltage Vref, and an output end of the operational amplifier Amp is electrically connected with a gate of the second control transistor T2; the control end of the Amp is electrically connected with the voltage-stabilizing control end S0;
the gate of the first control transistor T1 is electrically connected to the regulated control terminal S0, the source of the first control transistor T1 is electrically connected to a third voltage terminal V3, and the drain of the first control transistor T1 is electrically connected to the gate of the second control transistor T2;
the source of the second control transistor T2 is electrically connected to the fourth voltage terminal V4, and the drain of the second control transistor T2 is electrically connected to the first terminal of Cout;
the control circuit comprises a control unit 41, a first comparator 42 and a second comparator 43;
the first comparator 42 is electrically connected to the voltage output terminal Out, the first comparator 42 is connected to a first voltage VL, and the first comparator 42 is configured to compare the output voltage Vout with the first voltage and transmit an obtained first comparison result to the control unit 41;
the second comparator 43 is electrically connected to the voltage output terminal Out, the second comparator 43 is connected to a second voltage VH, and the second comparator 43 is configured to compare the output voltage Vout with the second voltage and transmit an obtained second comparison result to the control unit 41;
the control unit 41 is electrically connected to the first comparator 42, the second comparator 43, the digital voltage regulator circuit 12 and the analog voltage regulator circuit 13, is used for providing a trigger signal to the digital voltage stabilizing circuit 12 when the voltage stabilizing module is started, and is used for providing a first starting control signal to the digital voltage stabilizing circuit 12 when the output voltage Vout is less than a first voltage or more than a second voltage according to the first comparison result and the second comparison result, the voltage regulation control terminal S0 is used for providing a first turn-off control signal to the analog voltage regulation circuit 13, and is further used for providing a second turn-off control signal to the digital voltage regulation circuit 12 when the output voltage Vout obtained according to the first comparison result and the second comparison result is greater than the first voltage and less than the second voltage, and providing a second starting control signal to the analog voltage stabilizing circuit 13 through the voltage stabilizing control terminal S0.
In the embodiment shown in fig. 5, all transistors are p-type thin film transistors, and the control unit is a FSM, but not limited thereto.
In the embodiment shown in fig. 5, a 3-bit SAR ADC (analog-to-digital converter) is employed for power, area and response time tradeoffs, for multiple distributed LDOs (low dropout regulators) of SoC chips (system-on-chip) with better power and area.
In the embodiment shown in fig. 5, designated by reference numeral L0 is a load.
In operation of the embodiment of the regulator module of the present invention as shown in figure 5,
when the voltage stabilizing module is started, the control unit 41 provides a trigger signal to the 3-bit SAR analog-to-digital converter 51, the 3-bit SAR analog-to-digital converter 51 controls to boost Vout, and when Vout is smaller than a first voltage or Vout is greater than a second voltage, the control unit 41 provides a first start control signal to the 3-bit SAR analog-to-digital converter 51, and the 3-bit SAR analog-to-digital converter 51 controls to output S1, S2 and S3 according to a difference value between Vout and a reference voltage so as to control on and off of M1, M2 and M3; specifically, when the difference between the reference voltage and Vout is large, S1, S2 and S3 are all low voltage signals, M1, M2 and M3 are all turned on to charge Cout with the charging voltage signal provided by the charging voltage terminal V1, and since there are three charging channels at this time, the charging speed is fast; when the difference between the reference voltage and Vout becomes small, S1 becomes a high voltage signal, S2 and S3 are low voltage signals, M1 is turned off, M2 and M3 are turned on, and there are two charging channels; when the difference between the reference voltage and Vout becomes smaller again, S1 and S2 are high voltage signals, S3 is a low voltage signal, M1 and M2 are turned off, M3 is turned on, and a charging channel exists; when the Vout is larger than the reference voltage, S1, S2 and S3 are all high voltage signals, and M1, M2 and M3 are all turned off;
when Vout is smaller than the first voltage or Vout is greater than the second voltage, the control unit 41 provides a low voltage signal to Amp and T1 through S0 to control Amp to stop working, and make T1 open, control the connection between the gate of T2 and V3, and make T2 turn off;
when Vout is between the first voltage and the second voltage, the control unit 41 provides a second turn-off control signal to the 3-bit SAR analog-to-digital converter, and the control unit 41 provides a high voltage signal to the Amp and T1 through S0 to control the Amp to operate and to turn off T1; when the Amp compares that the Vout is larger than the reference voltage, the Amp outputs a high voltage signal, and T2 is turned off; when the Amp compares that Vout is less than the reference voltage, the Amp outputs a low voltage signal, T2 turns on to charge Cout with the fourth voltage signal provided via V4, so as to regulate Vout to the reference voltage.
Fig. 6 is a simulation operation timing diagram of the embodiment of the voltage stabilizing module shown in fig. 5.
As shown in fig. 6, after the voltage stabilizing module is started, the control unit 41 provides a trigger signal to the 3-bit SAR analog-to-digital converter 52, and the 3-bit SAR analog-to-digital converter 52 generates S1, S2, and S3 according to Vout and Vref to raise Vout;
in the first phase P1, Vout is smaller than VL, the control unit 41 controls the 3-bit SAR analog-to-digital converter 52 to operate;
in the second stage P2, Vout rises to be greater than VL, the control unit 41 controls the 3-bit SAR analog-to-digital converter 52 to stop working, and the control unit 41 controls Amp to work to control Vout to be regulated to Vref;
in the third stage P3, the load becomes large, Vout becomes suddenly small and smaller than VL, the control unit 41 controls the 3-bit SAR analog-to-digital converter 52 to work to increase Vout, the larger adjustment amplitude of the SAR analog-to-digital converter 52 causes Vout to be larger than VH, and after Vout is larger than VH, the 3-bit SAR analog-to-digital converter 52 decreases Vout until Vout is smaller than VH;
in the fourth phase P4, control unit 41 controls 3-bit SAR analog-to-digital converter 52 to stop operating, and control unit 41 controls Amp to operate to control Vout to be regulated to Vref.
In fig. 6, the horizontal axis represents time t in seconds, and the vertical axis represents Vout in volts.
The electronic device according to the embodiment of the invention may include the voltage stabilizing module.
When the electronic device is implemented specifically, the electronic device may further include an Soc chip (system-on-chip), the voltage regulation module may be an LDO (low dropout regulator), and the LDO provides a simple structure, low power consumption, high speed, and clean internal power supply for the Soc chip.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (11)
1. A voltage stabilizing module is characterized by comprising a voltage output end, a control circuit, a digital voltage stabilizing circuit and an analog voltage stabilizing circuit, wherein,
the control circuit is respectively electrically connected with the voltage output end, the digital voltage stabilizing circuit and the analog voltage stabilizing circuit, and is used for providing a trigger signal for the digital voltage stabilizing circuit when the voltage stabilizing module is started, and controlling the digital voltage stabilizing circuit to work and the analog voltage stabilizing circuit to not work when the output voltage provided by the voltage output end is less than a first voltage or more than a second voltage, and controlling the analog voltage stabilizing circuit to work and the digital voltage stabilizing circuit to not work when the output voltage is more than the first voltage and less than the second voltage;
the digital voltage stabilizing circuit is electrically connected with the voltage output end, is used for controlling and increasing the output voltage after receiving the trigger signal, and is used for controlling and adjusting the output voltage when being controlled by the control circuit to work so as to reduce the absolute value of the difference value between the output voltage and the reference voltage;
the analog voltage stabilizing circuit is electrically connected with the voltage output end and is used for adjusting the output voltage to the reference voltage when the analog voltage stabilizing circuit is controlled by the control circuit to work;
the reference voltage is greater than the first voltage and less than the second voltage.
2. The regulator module of claim 1, wherein the control circuit is further configured to provide a first turn-on control signal to the digital regulator circuit and a first turn-off control signal to the analog regulator circuit via the regulator control terminal when the output voltage is less than a first voltage or greater than a second voltage, and to provide a second turn-off control signal to the digital regulator circuit and a second turn-on control signal to the analog regulator circuit via the regulator control terminal when the output voltage is greater than the first voltage and less than the second voltage;
the digital voltage stabilizing circuit is further used for controlling to increase the output voltage when the output voltage is judged to be smaller than a preset reference voltage when the first turn-on control signal is received, controlling to decrease the output voltage when the output voltage is judged to be larger than the reference voltage, and stopping working when the second turn-off control signal is received;
the analog voltage stabilizing circuit is further configured to regulate the output voltage to the reference voltage when receiving the second turn-on control signal, and to stop working when receiving the first turn-off control signal.
3. The voltage regulator module according to claim 2, wherein the digital voltage regulator circuit comprises an analog-to-digital conversion unit, a charging control unit and an energy storage unit;
the analog-to-digital conversion unit is respectively electrically connected with the control circuit, the voltage output end and the charging control unit, and is used for comparing the output voltage with the reference voltage when receiving the trigger signal or the first starting control signal, providing a first charging control signal to the charging control unit when the output voltage is smaller than the reference voltage, and providing a first charging stopping control signal to the charging control unit when the output voltage is larger than the reference voltage;
the charging control unit is respectively electrically connected with the charging voltage end and the energy storage unit and used for controlling the charging voltage end to be communicated with the energy storage unit when receiving the first charging control signal, so that the charging voltage signal provided by the charging voltage end is used for charging the energy storage unit, and the charging control unit is used for controlling the charging voltage end to be disconnected with the energy storage unit when receiving the first charging stop control signal.
4. The voltage regulation module of claim 3 wherein the analog-to-digital conversion unit comprises an N-bit analog-to-digital converter; n is a positive integer; the first charge control signal comprises N first control signals;
the N-bit analog-to-digital converter is respectively electrically connected with the voltage output end, the reference voltage end and the charging control unit and is used for outputting the N first control signals to the charging control unit according to the output voltage and the reference voltage so as to control the connection or disconnection between the charging voltage end and the energy storage unit;
the reference voltage terminal is used for providing a reference voltage.
5. The voltage regulation module of claim 4 wherein the N-bit analog-to-digital converter is a successive approximation register analog-to-digital converter.
6. The voltage regulation module of claim 4 wherein the charge control unit comprises N charge control transistors;
a control electrode of the nth charging control transistor is connected with the nth first control signal, a first electrode of the nth charging control transistor is electrically connected with the charging voltage end, and a second electrode of the nth charging control transistor is electrically connected with the energy storage unit;
n is a positive integer less than or equal to N.
7. The voltage stabilization module of claim 3, wherein the energy storage unit comprises a storage capacitor;
the first end of the storage capacitor is electrically connected with the voltage output end, and the second end of the storage capacitor is electrically connected with the ground end.
8. The regulator module of claim 3, wherein said analog voltage regulator circuit includes an operational amplifier, a first control transistor and a second control transistor;
a first input end of the operational amplifier is electrically connected with the voltage output end, a second input end of the operational amplifier is connected with a reference voltage, and an output end of the operational amplifier is electrically connected with a control electrode of the second control transistor;
the control electrode of the first control transistor is electrically connected with the voltage stabilization control end, the first electrode of the first control transistor is electrically connected with the third voltage end, and the second electrode of the first control transistor is electrically connected with the control electrode of the second control transistor;
the first electrode of the second control transistor is electrically connected with the fourth voltage end, and the second electrode of the second control transistor is electrically connected with the energy storage unit.
9. The voltage stabilization module of any one of claims 3 to 8, wherein the control circuit comprises a control unit, a first comparator and a second comparator;
the first comparator is electrically connected with the voltage output end, is connected with a first voltage, and is used for comparing the output voltage with the first voltage and transmitting an obtained first comparison result to the control unit;
the second comparator is electrically connected with the voltage output end and is connected with a second voltage, and the second comparator is used for comparing the output voltage with the second voltage and transmitting an obtained second comparison result to the control unit;
the control unit is respectively and electrically connected with the first comparator, the second comparator, the digital voltage stabilizing circuit and the analog voltage stabilizing circuit, the digital voltage stabilizing circuit is used for providing a trigger signal for the digital voltage stabilizing circuit when the voltage stabilizing module is started, and providing a first starting control signal for the digital voltage stabilizing circuit when the output voltage is less than a first voltage or more than a second voltage according to the first comparison result and the second comparison result, providing a first turn-off control signal to the analog voltage stabilizing circuit through the voltage stabilizing control end, and when the output voltage is obtained to be greater than the first voltage and less than the second voltage according to the first comparison result and the second comparison result, and providing a second turn-off control signal for the digital voltage stabilizing circuit, and providing a second turn-on control signal for the analog voltage stabilizing circuit through the voltage stabilizing control end.
10. The voltage regulator module according to claim 9, wherein the control unit is a finite state machine.
11. An electronic device, comprising the voltage stabilizing module according to any one of claims 1 to 10.
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| CN202011560166.0A CN112578839A (en) | 2020-12-25 | 2020-12-25 | Voltage stabilizing module and electronic device |
| PCT/CN2021/095527 WO2022134452A1 (en) | 2020-12-25 | 2021-05-24 | Voltage stabilization module and electronic apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011560166.0A CN112578839A (en) | 2020-12-25 | 2020-12-25 | Voltage stabilizing module and electronic device |
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| WO2022134452A1 (en) * | 2020-12-25 | 2022-06-30 | 海宁奕斯伟集成电路设计有限公司 | Voltage stabilization module and electronic apparatus |
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| US10126766B2 (en) * | 2016-01-26 | 2018-11-13 | Samsung Electronics Co., Ltd. | Low dropout voltage (LDO) regulator including a dual loop circuit and an application processor and a user device including the same |
| CN106774587A (en) * | 2016-12-05 | 2017-05-31 | 清华大学 | A kind of low pressure difference linear voltage regulator |
| CN107977037B (en) * | 2017-11-17 | 2019-12-31 | 合肥鑫晟光电科技有限公司 | Low dropout regulator and control method thereof |
| US10185338B1 (en) * | 2017-12-20 | 2019-01-22 | Stmicroelectronics International N.V. | Digital low drop-out (LDO) voltage regulator with analog-assisted dynamic reference correction |
| CN109753099B (en) * | 2018-12-21 | 2020-06-09 | 西安电子科技大学 | Digital analog double-loop low dropout linear voltage regulator |
| CN112578839A (en) * | 2020-12-25 | 2021-03-30 | 海宁奕斯伟集成电路设计有限公司 | Voltage stabilizing module and electronic device |
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| WO2022134452A1 (en) * | 2020-12-25 | 2022-06-30 | 海宁奕斯伟集成电路设计有限公司 | Voltage stabilization module and electronic apparatus |
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