CN107024955B - Voltage generating circuit and power supply device - Google Patents
Voltage generating circuit and power supply device Download PDFInfo
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- CN107024955B CN107024955B CN201710398070.0A CN201710398070A CN107024955B CN 107024955 B CN107024955 B CN 107024955B CN 201710398070 A CN201710398070 A CN 201710398070A CN 107024955 B CN107024955 B CN 107024955B
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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
- G05F1/561—Voltage to current converters
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/325—Power saving in peripheral device
- G06F1/3265—Power saving in display device
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
Abstract
The invention discloses a voltage generating circuit and a power supply device, the voltage generating circuit includes: the power supply system comprises at least three power supply ends, wherein the at least three power supply ends are divided into a first group of power supply ends and a second group of power supply ends, each power supply end in the first group of power supply ends is used for providing different first power supply voltages, and each power supply end in the second group of power supply ends is used for providing different second power supply voltages; a control module for generating a selection signal according to a desired value of the output voltage; and the voltage conversion module is selectively connected with one of the first group of power supply terminals to receive the corresponding first power supply voltage according to the selection signal, and connected with one of the second group of power supply terminals to receive the corresponding second power supply voltage, and generates an output voltage according to the received first power supply voltage and the second power supply voltage. The voltage generation circuit and the power supply device provided by the invention can improve the conversion efficiency of the circuit and reduce the power consumption of the system on the premise of ensuring that the adjustable range of the output voltage is not changed.
Description
Technical Field
The present invention relates to the field of electronic technology, and more particularly, to a voltage generation circuit and a power supply device.
Background
With the gradual maturity of touch technology and display technology, touch display panels have been widely applied in various fields, especially in various mobile terminal systems.
The Touch Display panel generally includes a Touch and Display Driver Integration (TDDI), and after a mobile terminal system converts a power voltage provided by a battery into several basic voltages, a voltage generation circuit in the TDDI is configured to generate a common voltage with a certain adjustable range according to the several basic voltages, so that a common electrode in the Touch Display panel can be driven by the common voltage, thereby implementing normal Display and Touch.
Since only a part of the common voltage adjustable range required by the touch display panel is usually a common range, in order to ensure that the output of the voltage generation circuit in the TDDI can satisfy the full adjustable range of the common voltage, a high-amplitude positive supply voltage and a high-amplitude negative supply voltage must be provided to the voltage generation circuit.
Taking a smart phone system as an example, the smart phone system converts a power supply voltage provided by a mobile phone battery into a power supply voltage of ± 5.6V and 1.8V. Fig. 1 shows a schematic diagram of a voltage generation circuit in a TDDI of the prior art. As shown in fig. 1, the voltage generating circuit 100 includes a capacitor C0, an error amplifier OP0, and two adjusting transistors M1 and M2, the adjusting transistors M1 and M2 are connected in series between a first power supply voltage and a second power supply voltage, a common terminal of the adjusting transistors M1 and M2 provides a common voltage Vcom, the capacitor C0 is connected between a common terminal of the adjusting transistors M1 and M2 and ground, and the on and off of the adjusting transistors M1 and M2 are respectively controlled by the output of the error amplifier OP 0. The negative phase input terminal of the error amplifier OP1 receives the reference voltage Vref, and the positive phase input terminal receives the common voltage Vcom. According to the requirement of the touch display device, the voltage generating circuit 100 needs to output the common voltage Vcom of-4V to 1V, so that 1.8V and-5.6V are selected as the first power supply voltage and the second power supply voltage respectively to ensure the correct output range of the common voltage Vcom. However, since the common range of the common voltage Vcom output to the common electrode in the touch display device is-2.5V to 0V, for example, when the voltage generating circuit 100 outputs the common voltage Vcom of-1V, the voltage generating circuit 100 needs to generate a current of approximately 1mA, and the consumed power is approximately 5.6mW, and the conversion efficiency of the voltage generating circuit 100 is only 1/5.6-18%.
Therefore, when the required common voltage is in a common range, the conversion efficiency of the conventional voltage generation circuit is low, resulting in waste in power consumption; further, when the touch display panel normally operates, the conventional voltage generation circuit operates in a state of low conversion efficiency for a long time, which may cause a power consumption waste to be more serious.
Disclosure of Invention
In order to solve the problems in the prior art, the present invention provides a voltage generating circuit and a power supply apparatus, which can improve the conversion efficiency of the circuit and reduce the power consumption of the system on the premise of ensuring that the adjustable range of the output voltage is not changed.
According to an aspect of the present invention, there is provided a voltage generation circuit for providing an output voltage having an adjustable range, the voltage generation circuit comprising: the power supply system comprises at least three power supply ends, wherein the at least three power supply ends are divided into a first group of power supply ends and a second group of power supply ends, each power supply end in the first group of power supply ends is used for providing different first power supply voltages, and each power supply end in the second group of power supply ends is used for providing different second power supply voltages; a control module for generating a selection signal in accordance with a desired value of the output voltage; a voltage conversion module selectively coupled to one of the first set of power supply terminals to receive the corresponding first power supply voltage and to one of the second set of power supply terminals to receive the corresponding second power supply voltage according to the selection signal, and generating the output voltage according to the received first power supply voltage and the received second power supply voltage.
Preferably, the voltage conversion module includes: an adjusting unit selectively receiving one of the plurality of first supply voltages and one of the plurality of second supply voltages according to the selection signal and converting the received first supply voltage or the received second supply voltage into the output voltage under the action of a control signal; an amplifier having an inverting input terminal receiving a reference voltage set according to a desired value of the output voltage, a non-inverting input terminal receiving the output voltage or a sampled voltage obtained by sampling the output voltage in a set ratio, an output terminal providing the control signal, a positive power supply terminal selectively receiving one of the first power supply voltages according to the selection signal, and a negative power supply terminal selectively receiving one of the second power supply voltages according to the selection signal.
Preferably, the first power supply voltage provided by each power supply terminal in the first group of power supply terminals is greater than or equal to 0, and the second power supply voltage provided by each power supply terminal in the second group of power supply terminals is less than 0.
Preferably, the output terminal of the amplifier includes a first output terminal and a second output terminal, the control signal includes a first control signal output by the first output terminal and a second control signal output by the second output terminal, and the adjusting unit includes: a first adjusting unit, selectively connected to one of the first group of power supply terminals according to the selection signal to receive the corresponding first power supply voltage, wherein the first adjusting unit is turned on and off under the control of the first control signal, and when the first adjusting unit is turned on, a positive-phase adjusting current is provided at an output terminal of the first adjusting unit; and the second adjusting unit is selectively connected with one of the second group of power supply terminals according to the selection signal to receive the corresponding second power supply voltage, the on and off of the second adjusting unit is controlled by the second control signal, when the second adjusting unit is turned on, the output end of the second adjusting unit provides an inverted adjusting current, and the non-inverted adjusting current or the inverted adjusting current acts on a load to generate the output voltage.
Preferably, the first adjusting unit includes: a plurality of first transistors, a first path end of each first transistor being connected to each power supply end in the first group of power supply ends, respectively, and second path ends of the plurality of first transistors being interconnected to serve as an output end of the first adjusting unit; a first selection switch for selectively connecting a control terminal of one of the plurality of first transistors to a first output terminal of the amplifier according to the selection signal.
Preferably, the first adjusting unit includes: a control end of the first transistor is connected with the second output end of the amplifier, and a first pass end of the first transistor is used as an output end of the first adjusting unit; a second selection switch for selectively connecting a second pass terminal of the first transistor to one of the first group of power supply terminals to receive the corresponding first power supply voltage according to the selection signal.
Preferably, the first transistor is a P-channel transistor.
Preferably, the second adjusting unit includes: a plurality of second transistors, a first pass end of each of the second transistors being respectively connected to each of the power supply ends of the second group of power supply ends, second pass ends of the plurality of second transistors being interconnected to serve as an output end of the second adjusting unit, and a third selection switch for selectively connecting a control end of one of the plurality of second transistors to a second output end of the amplifier according to the selection signal.
Preferably, the second adjusting unit includes: a control end of the second transistor is connected with the second output end of the amplifier, and a first pass end of the second transistor is used as an output end of the second adjusting unit; a fourth selection switch for selectively connecting the second pass terminal of the second transistor with one of the second group of power supply terminals to receive the corresponding second power supply voltage according to the selection signal.
Preferably, the second transistor is an N-channel transistor.
According to another aspect of the present invention, there is also provided a power supply device, characterized by comprising: a battery for providing a supply voltage; the voltage generating circuit of any one of the above claims, wherein the plurality of power supply terminals of the voltage generating circuit respectively receive the plurality of power supply voltages to generate the output voltage; and a supply circuit for generating the different first supply voltage and the different second supply voltage.
Compared with the prior art, the voltage generation circuit and the power supply device have the advantages that the power supply voltage of the voltage generation circuit is selected and switched according to the expected value of the output voltage, so that the adjustable range of the output voltage of the voltage generation circuit is ensured, the conversion efficiency of the voltage generation circuit is remarkably improved, the power consumption of a system is reduced, the working time of the system is prolonged, and the power-saving design is realized.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic diagram illustrating a voltage generation circuit in a TDDI according to the prior art.
Fig. 2 shows a schematic block diagram of a power supply apparatus of an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a voltage generation circuit according to an embodiment of the present invention.
Fig. 4 is a diagram illustrating a relationship between a desired value of an output voltage and a positive phase power supply voltage and a negative phase power supply voltage of a voltage generation circuit according to an embodiment of the present invention.
Fig. 5 is a schematic diagram illustrating a structure of the voltage conversion module in fig. 3.
Fig. 6a shows a schematic diagram of an implementation structure of the first adjusting unit in fig. 5.
Fig. 6b shows a schematic diagram of another implementation structure of the first adjusting unit in fig. 5.
Fig. 7a shows a schematic diagram of an implementation structure of the second adjustment unit in fig. 5.
Fig. 7b shows a schematic diagram of another implementation structure of the second adjustment unit in fig. 5.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by like reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale. Moreover, certain well-known elements may not be shown in the figures.
In the following description, numerous specific details of the invention, such as structure, materials, dimensions, processing techniques and techniques of the devices are described in order to provide a more thorough understanding of the invention. However, as will be understood by those skilled in the art, the present invention may be practiced without these specific details.
The present invention will be described in detail below with reference to the accompanying drawings.
Fig. 2 shows a schematic block diagram of a power supply apparatus of an embodiment of the present invention.
As shown in fig. 2, the power supply apparatus 1000 according to the embodiment of the invention is applied to a touch display apparatus, and the power supply apparatus 1000 includes a battery 1100, a power supply circuit 1200 and a voltage generation circuit 1300.
The power supply circuit 1200 is configured to generate a plurality of power supply voltages (e.g., the power supply voltage Vp1, the power supply voltage Vp2, the power supply voltage Vn1, and the power supply voltage Vn2 shown in fig. 2) according to a power supply voltage V0 provided by the battery 1100.
The voltage generating circuit 1300 is used to provide an output voltage Vout with an adjustable range, which is applied to each common electrode in the touch display device as a common voltage Vcom, for example. The voltage generation circuit 1300 is included in TDDI, for example. In the present embodiment, the voltage generating circuit 1300 has at least three power supply terminals respectively receiving different power supply voltages, wherein the power supply terminals include a first group of power supply terminals for providing different first power supply voltages and a second group of power supply terminals for providing different second power supply voltages, for example, each power supply terminal in the first group of power supply terminals provides a first power supply voltage greater than or equal to 0 (e.g., the power supply voltages Vp1 and Vp2 shown in fig. 2), and each power supply terminal in the second group of power supply terminals provides a second power supply voltage less than 0 (e.g., the power supply voltages Vn1 and Vn2 shown in fig. 2).
Fig. 3 is a schematic structural diagram of a voltage generation circuit according to an embodiment of the present invention.
As shown in fig. 3, the voltage generation circuit 1300 according to the embodiment of the present invention includes a control module 1310 and a voltage conversion module 1320.
The control module 1310 provides a selection signal sel for selecting a non-inverting supply voltage of the voltage conversion module 1320 among the first supply voltages and an inverting supply voltage of the voltage conversion module 1320 among the second supply voltages, depending on the desired value of the output voltage. The select signal sel is, for example, a 2-bit digital signal, the least significant bit sel [0] of the select signal sel is used to select the non-inverting supply voltage of the voltage conversion module 1320, and the most significant bit sel [1] of the select signal sel is used to select the inverting supply voltage of the voltage conversion module 1320.
The voltage conversion module 1320 is coupled to the first set of power terminals to receive a first supply voltage (e.g., supply voltages Vp1 and Vp2 of FIG. 3) having respective magnitudes greater than or equal to 0 and is coupled to the second set of power terminals to receive a second supply voltage (e.g., Vn1 and Vn2 of FIG. 3) having respective magnitudes less than 0. The voltage conversion module 1320 selects one of the first power supply voltages as a non-inverting power supply voltage according to a least significant bit sel [0] of the selection signal output by the control module 1310 and one of the second power supply voltages as an inverting power supply voltage according to a most significant bit sel [1] of the selection signal. The voltage conversion module 1320 generates the output voltage Vout under the influence of the positive phase supply voltage and the negative phase supply voltage.
The voltage converting module 1320 is, for example, a Low Dropout linear Regulator (LDO).
Fig. 4 is a schematic diagram illustrating a corresponding relationship between a desired value of an output voltage and a positive phase power supply voltage and a negative phase power supply voltage of a voltage conversion module according to an embodiment of the present invention.
As a specific example, as shown in fig. 2, the battery 1100 in the power supply apparatus 1000 generates the power supply voltage V0 approximately equal to 4.2V to 3.7V. And dividing the adjustable range of the output voltage into a first sub-range to a third sub-range according to the amplitude use probability of the output voltage Vout, and determining the amplitude of each supply voltage according to the boundary value of the first sub-range to the third sub-range. In the touch display device, the adjustment range required for the common voltage on the common electrode is, for example, -4V to 1V, and the commonly used amplitude range is, for example, -2.8V to 0V, so that, in order to improve the conversion efficiency of the voltage generation circuit 1300, the power supply circuit 1200 generates, according to the power supply voltage V0, a power supply voltage Vp1 being 0V, a power supply voltage Vp2 being +1.8V, a power supply voltage Vn1 being-2.8V, and a power supply voltage Vn2 being-5.6V, wherein the power supply voltage Vn1 can be converted from the power supply voltage Vn2 (for example, by using a charge pump). The voltage generation circuit 1300 generates the output voltage Vout with an adjustable amplitude in the range of-4V to +1V using the four supply voltages.
Specifically, as shown in fig. 4: when the desired value of the output voltage Vout (corresponding to the common voltage) is within a first sub-range (usual) of-2.8V or more and 0V or less, the voltage generation circuit 130 sets the supply voltage Vp 1-0V as a positive-phase supply voltage by the selection signal sel and sets the supply voltage Vn 1-2.8V as a negative-phase supply voltage by the selection signal sel; when the desired value of the output voltage Vout is within a second sub-range (not commonly used) greater than or equal to-4V and less than-2.8V, the voltage generation circuit 130 sets the supply voltage Vp1 (the minimum first supply voltage received by the first group of supply terminals) as the positive-phase supply voltage under the action of the selection signal sel and sets the supply voltage Vn2 as the negative-phase supply voltage under the action of the selection signal sel; when the desired value of the output voltage Vout is within a third sub-range (not commonly used) greater than 0V and equal to or less than 1V, the voltage generation circuit 130 sets the supply voltage Vp2 at 1.8V as the positive-phase supply voltage by the selection signal sel, and sets the supply voltage Vn1 at-2.8V (the second supply voltage having the smallest absolute value received by the second group of supply terminals) as the negative-phase supply voltage by the selection signal sel. Compared with the prior art, the voltage generation circuit provided by the embodiment of the invention can reduce the power consumption by 1 time, thereby ensuring the output range of the output voltage Vout, improving the conversion efficiency of the voltage generation circuit on the basis of the prior art and reducing the power consumption.
Fig. 5 is a schematic diagram illustrating a structure of the voltage conversion module in fig. 3.
As shown in fig. 5, the voltage converting module 1320 of the embodiment of the present invention includes an amplifier OP1, a regulating unit 1321 and a capacitor Cf, wherein the capacitor Cf is connected between the output terminal of the output voltage Vout and ground to implement filtering and voltage stabilization.
The amplifier OP1 is used to generate a control signal according to the comparison result between the output voltage Vout (or a sampling voltage obtained by sampling the output voltage Vout in a certain proportion) and a reference voltage Vref, wherein the reference voltage Vref is determined by the expected value of the output voltage Vout. The positive supply terminal OP _ P of the amplifier OP1 receives the positive supply voltage of the voltage conversion module 1320 (one of the supply voltages Vp1 and Vp2 indicated by the least significant bit of the selection signal), and the negative supply terminal OP _ N of the amplifier OP2 receives the negative supply voltage of the voltage conversion module 1320 (one of the supply voltages Vn1 and Vn2 indicated by the most significant bit of the selection signal). The control signals include a first control signal ctl1 output by a first output terminal of the amplifier OP1 and a second control signal ctl2 output by a second output terminal. The amplifier OP1 is, for example, a class AB error operational amplifier.
As a specific example, the positive supply terminal of the amplifier OP1 is connected to one terminal of a multi-way switch unit, and the multi-way switch unit conducts the positive supply terminal OP _ P of the amplifier OP1 with one of the first group of supply terminals under the control of the least significant bit sel [0] of the selection signal, so that the positive supply terminal of the amplifier OP1 receives the positive supply voltage of the voltage conversion module 1320; the negative supply terminal of the amplifier OP1 is connected to one terminal of another multi-way switch unit, and the multi-way switch unit conducts the negative supply terminal OP _ N of the amplifier OP1 to one of the second group of supply terminals under the control of the most significant bit sel [1] of the selection signal, so that the negative supply terminal of the amplifier OP1 receives the inverted supply voltage of the voltage conversion module 1320.
The adjusting unit 1321 includes a first adjusting unit 1321a and a second adjusting unit 1321 b.
The turning on and off of the first adjusting unit 1321a is controlled by a first control signal ctl2, and the first adjusting unit 1321a provides a positive adjustment current Ip when turned on, which acts on a load of the voltage generating circuit 1300 to generate an output voltage Vout equal to or greater than 0. The first adjustment unit 1321a receives the least significant bit sel [0] of the selection signal to select one of the supply voltages Vp1 and Vp2 as the positive phase supply voltage of the voltage conversion module 1320, and generates the positive phase adjustment current Ip using the positive phase supply voltage.
The second adjusting unit 1321b is controlled to turn on and off by the second control signal ctl2, and the second adjusting unit 1321b provides an inverted adjusting current In when turned on, which acts on a load of the voltage generating circuit 1300 to generate the output voltage Vout smaller than 0. The second adjusting unit 1321b receives the most significant bit sel [1] of the selection signal to select one of the supply voltages Vn1 and Vn2 as an inverted supply voltage of the voltage conversion module 1320, and generates an inverted adjustment current In using the inverted supply voltage.
Fig. 6a shows a schematic diagram of an implementation structure of the first adjusting unit in fig. 5.
As shown in fig. 6a, the first adjusting unit 1321a includes a selection switch K1 and transistors MP1 and MP2 connected in series between supply voltages Vp1 and Vp 2. A first terminal of the selection switch K1 receives the first control signal ctl1, and two second terminals of the selection switch K1 are respectively connected to the control terminal of the transistor MP1 and the control terminal of the transistor MP 2. The common terminal of the transistors MP1 and MP2 is connected to the output terminal of the voltage generation circuit 1300 for providing the output voltage Vout.
The selection switch K1 is controlled by the least significant bit sel [0] of the selection signal, for example, when the least significant bit sel [0] of the selection signal is at the first level, the selection switch K1 connects the control terminal of the transistor MP1 to the first output terminal of the amplifier OP1 to make the transistor MP1 turn on and off under the control of the first control signal ctl1, and when the transistor MP1 turns on, the first adjustment unit 1321a generates the positive adjustment current Ip according to the supply voltage Vp 1; when the least significant bit sel [0] of the select signal is at the second level, the select switch K1 connects the control terminal of the transistor MP2 to the first output terminal of the amplifier OP1 to make the transistor MP2 turn on and off under the control of the first control signal ctl1, and when the transistor MP2 turns on, the first adjusting unit 1321a generates the positive adjustment current Ip according to the supply voltage Vp 2.
Specifically, the transistor MP1 and the transistor MP2 are, for example, P-channel transistors.
Fig. 6b shows a schematic diagram of another implementation structure of the first adjusting unit in fig. 5.
As shown in fig. 6b, the first adjusting unit 1321a includes a selection switch K2 and a transistor MP 0. A first terminal of the selection switch K2 is connected to the first path terminal of the transistor MP0, and two second terminals of the selection switch K2 receive the supply voltages Vp1 and Vp2, respectively. A control terminal of the transistor MP0 is connected to the first output terminal of the amplifier OP1 to receive the first control signal ctl 1.
The selection switch K2 is controlled by the least significant bit sel [0] of the selection signal, for example, when the least significant bit sel [0] of the selection signal is at the first level, the selection switch K2 makes the first path terminal of the transistor MP0 receive the supply voltage Vp1, and when the transistor MP0 is turned on under the control of the first control signal ctl1, the first adjustment unit 1321a generates the positive adjustment current Ip according to the supply voltage Vp 1; when the lowest bit sel [0] of the selection signal is at the second level, the selection switch K2 makes the first path terminal of the transistor MP0 receive the supply voltage Vp2, and when the transistor MP0 is turned on under the control of the first control signal ctl1, the first adjustment unit 1321a generates the positive adjustment current Ip according to the supply voltage Vp 2.
Specifically, the transistor MP0 is, for example, a P-channel transistor.
Fig. 7a shows a schematic diagram of an implementation structure of the second adjustment unit in fig. 5.
As shown in fig. 7a, the second adjusting unit 1321b includes a selection switch K3 and transistors MN1 and MN2 connected in series between supply voltages Vn1 and Vn 2. A first terminal of the selection switch K3 receives the second control signal ctl2, and two second terminals of the selection switch K3 are respectively connected to the control terminal of the transistor MN1 and the control terminal of the transistor MN 2. The common terminal of the transistors MN1 and MN2 is connected to the output terminal of the voltage generation circuit 1300 for providing the output voltage Vout.
The selection switch K3 is controlled by the most significant bit sel [1] of the selection signal, for example, when the most significant bit sel [1] of the selection signal is at the first level, the selection switch K3 connects the control terminal of the transistor MN1 with the second output terminal of the amplifier OP1 to make the transistor MN1 turn on and off under the control of the second control signal ctl2, and when the transistor MN1 turns on, the second adjustment unit 1321b generates the inverted adjustment current In according to the supply voltage Vn 1; when the most significant bit sel [1] of the selection signal is at the second level, the selection switch K3 connects the control terminal of the transistor MN2 with the second output terminal of the amplifier OP1 to make the transistor MN2 turn on and off under the control of the second control signal ctl2, and when the transistor MN2 turns on, the second adjustment unit 1321b generates the inverted adjustment current In according to the supply voltage Vn 2.
Specifically, the transistor MN1 and the transistor MN2 are, for example, N-channel transistors.
Fig. 7b shows a schematic diagram of another implementation structure of the second adjustment unit in fig. 5.
As shown in fig. 7b, the second adjusting unit 1321b includes a selection switch K4 and a transistor MN 0. A first terminal of the selection switch K4 is connected to the first path terminal of the transistor MN0, and two second terminals of the selection switch K4 receive the supply voltages Vn1 and Vn2, respectively. A control terminal of the transistor MN0 is connected to the second output terminal of the amplifier OP1 to receive the second control signal ctl 2.
The selection switch K4 is controlled by the most significant bit sel [1] of the selection signal, for example, when the most significant bit sel [1] of the selection signal is at the first level, the selection switch K4 makes the first path terminal of the transistor MN0 receive the power supply voltage Vn1, and when the transistor MN0 is turned on under the control of the second control signal ctl2, the second adjustment unit 1321b generates the inverted adjustment current In according to the power supply voltage Vn 1; when the most significant bit sel [1] of the selection signal is at the second level, the selection switch K4 makes the first path terminal of the transistor MN0 receive the power supply voltage Vn2, and when the transistor MN0 is turned on under the control of the second control signal ctl2, the second adjustment unit 1321b generates the inverted adjustment current In according to the power supply voltage Vn 2.
Specifically, the transistor MN0 is, for example, an N-channel transistor.
In summary, compared with the prior art, the voltage generation circuit and the power supply device in the embodiments of the present invention have the beneficial effects that, compared with the prior art, the voltage generation circuit and the power supply device in the embodiments of the present invention select and switch the power supply voltage of the voltage generation circuit according to the expected value of the output voltage, which not only ensures the adjustable range of the output voltage of the voltage generation circuit, but also significantly improves the conversion efficiency of the voltage generation circuit and reduces the power consumption of the system, thereby prolonging the working time of the system and realizing the power saving design.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, article, or apparatus that comprises the element.
While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated.
Claims (11)
1. A voltage generation circuit for providing an output voltage having an adjustable range, the voltage generation circuit comprising:
the power supply system comprises at least three power supply ends, wherein the at least three power supply ends are divided into a first group of power supply ends and a second group of power supply ends, each power supply end in the first group of power supply ends is used for providing different first power supply voltages, and each power supply end in the second group of power supply ends is used for providing different second power supply voltages;
a control module for generating a selection signal in accordance with a desired value of the output voltage;
the adjusting unit is selectively connected with one of the first group of power supply terminals to receive the corresponding first power supply voltage according to the selection signal, is connected with one of the second group of power supply terminals to receive the corresponding second power supply voltage, and selects the received first power supply voltage or the received second power supply voltage to generate the output voltage according to a control signal; and
an amplifier that receives a reference voltage set according to a desired value of the output voltage and provides the control signal according to the reference voltage and the output voltage,
wherein the adjustable range comprises a plurality of sub-ranges, the control module provides the selection signal according to the sub-range corresponding to the expected value of the output voltage, and the first supply voltage and the second supply voltage are determined by the boundary value of each sub-range.
2. The voltage generation circuit of claim 1, wherein for the amplifier, an inverting input thereof receives a reference voltage set according to a desired value of the output voltage, a non-inverting input thereof receives the output voltage or a sampled voltage obtained by sampling the output voltage in a set proportion, an output thereof provides the control signal, a positive power supply thereof selectively receives one of the first power supply voltages according to the selection signal, and a negative power supply thereof selectively receives one of the second power supply voltages according to the selection signal.
3. The voltage generating circuit of claim 2, wherein the first supply voltage provided by each of the first set of supply terminals is greater than or equal to 0, and wherein the second supply voltage provided by each of the second set of supply terminals is less than 0.
4. The voltage generation circuit of claim 3, wherein the output of the amplifier comprises a first output and a second output, wherein the control signal comprises a first control signal output by the first output and a second control signal output by the second output,
the adjusting unit includes:
a first adjusting unit, selectively connected to one of the first group of power supply terminals according to the selection signal to receive the corresponding first power supply voltage, wherein the first adjusting unit is turned on and off under the control of the first control signal, and when the first adjusting unit is turned on, a positive-phase adjusting current is provided at an output terminal of the first adjusting unit;
a second adjusting unit selectively connected to one of the second group of power supply terminals according to the selection signal to receive the corresponding second power supply voltage, wherein the second adjusting unit is turned on and off under the control of the second control signal, and an output terminal of the second adjusting unit provides an inverted adjusting current when the second adjusting unit is turned on,
the positive phase adjusting current or the negative phase adjusting current acts on a load to generate the output voltage.
5. The voltage generation circuit of claim 4, wherein the first adjustment unit comprises:
a plurality of first transistors, a first path end of each of the first transistors being connected to each of the power supply ends in the first group of power supply ends, respectively, and second path ends of the plurality of first transistors being interconnected to serve as an output end of the first adjusting unit;
a first selection switch for selectively connecting a control terminal of one of the plurality of first transistors to a first output terminal of the amplifier according to the selection signal.
6. The voltage generation circuit of claim 4, wherein the first adjustment unit comprises:
a control end of the first transistor is connected with the second output end of the amplifier, and a first pass end of the first transistor is used as an output end of the first adjusting unit;
a second selection switch for selectively connecting a second pass terminal of the first transistor to one of the first group of power supply terminals to receive the corresponding first power supply voltage according to the selection signal.
7. The voltage generation circuit according to any one of claims 5 or 6, wherein the first transistor is a P-channel transistor.
8. The voltage generation circuit of claim 4, wherein the second adjustment unit comprises:
a plurality of second transistors, a first pass terminal of each of the second transistors being respectively connected to each of the power supply terminals of the second group of power supply terminals, second pass terminals of the plurality of second transistors being interconnected to serve as an output terminal of the second adjusting unit,
and a third selection switch for selectively connecting the control terminal of one of the second transistors to the second output terminal of the amplifier according to the selection signal.
9. The voltage generation circuit of claim 4, wherein the second adjustment unit comprises:
a control end of the second transistor is connected with the second output end of the amplifier, and a first pass end of the second transistor is used as an output end of the second adjusting unit;
a fourth selection switch for selectively connecting the second pass terminal of the second transistor with one of the second group of power supply terminals to receive the corresponding second power supply voltage according to the selection signal.
10. The voltage generation circuit according to any one of claims 8 or 9, wherein the second transistor is an N-channel transistor.
11. A power supply device, comprising:
a battery for providing a supply voltage;
a voltage generation circuit according to any one of claims 1 to 10; and
a supply circuit for generating the different first supply voltage and the different second supply voltage using the supply voltage.
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| CN201710398070.0A CN107024955B (en) | 2017-05-31 | 2017-05-31 | Voltage generating circuit and power supply device |
| KR1020170083046A KR101971222B1 (en) | 2017-05-31 | 2017-06-30 | Voltage generating circuit and power supply device |
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| CN201710398070.0A CN107024955B (en) | 2017-05-31 | 2017-05-31 | Voltage generating circuit and power supply device |
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| JPH08242537A (en) * | 1994-12-16 | 1996-09-17 | Sgs Thomson Microelectron Sa | Circuit for selecting supply voltage for voltage regulator |
| CN1150091A (en) * | 1995-07-18 | 1997-05-21 | 葛拉夫狄克株式会社 | Thermal head and head drive circuit therefor |
| CN101162866A (en) * | 2006-10-09 | 2008-04-16 | 思柏科技股份有限公司 | Adjustable variant electric voltage voltage-stabilizing device |
| CN104914906A (en) * | 2014-01-10 | 2015-09-16 | 雅达电子国际有限公司 | Control circuits and methods for regulating output voltages using multiple and/or adjustable reference voltages |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4643954B2 (en) * | 2004-09-09 | 2011-03-02 | ルネサスエレクトロニクス株式会社 | Gradation voltage generation circuit and gradation voltage generation method |
| CN102855856B (en) * | 2012-08-30 | 2016-04-13 | 南京中电熊猫液晶显示科技有限公司 | A kind of driving method and liquid crystal display thereof eliminating liquid crystal display Mura |
| KR102307725B1 (en) * | 2015-01-30 | 2021-10-01 | 엘지디스플레이 주식회사 | Apparatus for generating gray scale voltage and apparatus for driving data for display and display apparatus comprising the same |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08242537A (en) * | 1994-12-16 | 1996-09-17 | Sgs Thomson Microelectron Sa | Circuit for selecting supply voltage for voltage regulator |
| CN1150091A (en) * | 1995-07-18 | 1997-05-21 | 葛拉夫狄克株式会社 | Thermal head and head drive circuit therefor |
| CN101162866A (en) * | 2006-10-09 | 2008-04-16 | 思柏科技股份有限公司 | Adjustable variant electric voltage voltage-stabilizing device |
| CN104914906A (en) * | 2014-01-10 | 2015-09-16 | 雅达电子国际有限公司 | Control circuits and methods for regulating output voltages using multiple and/or adjustable reference voltages |
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| CN107024955A (en) | 2017-08-08 |
| KR101971222B1 (en) | 2019-04-22 |
| KR20180131304A (en) | 2018-12-10 |
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