CN116030752A - Current generating circuit and driving chip - Google Patents

Abstract

The invention discloses a current generation circuit and a driving chip for generating global current. Wherein the circuit comprises: the device comprises a current control module and a target current generation module, wherein the current control module receives accurate current and generates global current according to the accurate current; the target current generation module is connected with the current control module and used for adjusting the current starting point of the global current. The invention solves the technical problem that the global current generated by the traditional constant current source driving circuit can not drive a load.

Description

Current generating circuit and driving chip

Technical Field

The invention relates to the field of display driving, in particular to a current generation circuit and a driving chip.

Background

In the current application of the LED display driving chip, a circuit to be driven, namely a load, needs to be driven by current provided by a constant current source driving circuit. The constant current source driving circuit part of the circuit plays a quite important role, and the main role of the constant current source driving circuit part is to provide a global current with zero temperature coefficient for a circuit to be driven, and further provide an output current for a load such as an LED lamp according to the global current so as to drive the LED lamp. In the above process, the global current output by the constant current source driving circuit needs to be variable and adjustable, however, since the LED lamp cannot be usually lightened when the driving current is small, many invalid adjustment gears exist in the gears for adjusting the current in the frame of the constant current source driving circuit in the related art, which results in waste of circuit structure and performance, and the LED display screen has the problem of low ash and incapability of starting in the display process.

In view of the above problems, no effective solution has been proposed at present.

Disclosure of Invention

The embodiment of the invention provides a current generation circuit and a driving chip, which are used for at least solving the technical problem that a load cannot be driven by global current generated by a traditional constant current source driving circuit.

According to an aspect of an embodiment of the present invention, there is provided a current generation circuit for generating a global current, including: the device comprises a current control module and a target current generation module, wherein the current control module receives accurate current and generates global current according to the accurate current; the target current generation module is connected with the current control module and used for adjusting the current starting point of the global current.

The current starting point of the global current is adjusted by adopting the target current generating module, so that the purpose that the current generating circuit can successfully drive the load when generating the global current by adopting any gear in the full gears is achieved, and the technical problem that the load cannot be driven by the global current generated by the traditional constant current source driving circuit is solved.

Optionally, the current generation circuit further includes: and the current gain adjusting module is connected with the current control module and the target current generating module and is used for adjusting the current gain of the global current.

The current gain of the global current is adjusted by adopting the current gain adjusting module, so that the corresponding relation between the gear of the current generating circuit and the amplitude of the current gain is changed, the global current is accurately adjusted, and the change of the current value adjusting range of the global current can be realized.

Optionally, the target current generating module includes at least one target current generating unit, and the at least one target current generating unit is connected with the current control module and is used for adjusting a current starting point of the global current.

Optionally, the target current generating unit includes: the first switching element is used for controlling the current starting point adjusting element to be connected with the current control module; the current starting point adjusting element is connected with the current control module through the first switching element; the target current generating unit is used for adjusting the current starting point of the global current by changing the connection state of the current starting point adjusting element and the current control module.

Optionally, the current start point adjustment element includes: the first switching element includes a single pole single throw switch.

Optionally, the current gain adjustment module includes: and the current gain adjusting unit is connected with the current control module and used for adjusting the current gain of the global current.

Optionally, each of the current gain adjustment units includes: the second switching element is used for controlling the current gain adjusting element to be connected with the current control module; the current gain adjusting element is connected with the current control module through the second switching element; the current gain adjusting unit is used for adjusting the current gain of the global current by changing the connection state of the current gain adjusting element and the current control module.

Optionally, the current gain adjustment element includes: and a second field effect transistor, the second switching element comprising a single pole single throw switch.

Optionally, the above current generation circuit further includes: and the controller is respectively connected with the target current generation module and the current gain adjustment module and is used for adjusting and controlling the target current generation module and the current gain adjustment module according to the target value of the global current.

Optionally, the above current generation circuit further includes: and the bias module is connected with the current control module and used for providing the accurate current for the current control module.

According to another aspect of the embodiment of the present invention, there is also provided a driving chip, where the driving chip includes any one of the above-mentioned current generating circuits.

In an embodiment of the present invention, a current generation circuit for generating a global current is employed, wherein the current generation circuit includes: the current control module receives accurate current and generates global current according to the accurate current; the target current generation module is connected with the current control module and used for adjusting the current starting point of the global current, so that the purpose of ensuring that the current generation circuit can successfully drive a load when generating the global current by adopting any gear in all gears is achieved, the technical effect of reducing the waste of circuit structures in the current generation circuit in the constant current source driving circuit frame is achieved, and the technical problem that the global current generated by the traditional constant current source driving circuit cannot drive the load is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

fig. 1 is a circuit diagram of a current mirror provided according to the related art;

FIG. 2 is a schematic diagram of a conventional current mirror output current provided in accordance with the related art;

fig. 3 is a block diagram of a current generation circuit provided according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of providing global current according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of another global current provided in accordance with an alternative embodiment of the present invention;

fig. 6 is a circuit diagram of a current generation circuit provided in accordance with an alternative embodiment of the present invention.

Detailed Description

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

First, partial terms or terminology appearing in the course of describing the embodiments of the present application are applicable to the following explanation:

the circuit structure in the chip can mirror a certain proportion of Current based on a reference Current inside the chip.

The MOS transistor, i.e., the field effect transistor, is an abbreviation of MOSFET, and the MOSFET metal-oxide semiconductor field effect transistor, i.e., the metal-oxide semiconductor field effect transistor, includes G (gate), S (source) and D (drain).

The PMOS tube refers to an n-type substrate and a p-channel, and is a MOS tube for conveying current by the flow of holes, and is called a positive MOS.

NMOS refers to a p-type substrate, an n-channel MOS tube, and is called as a Negative MOS.

The drain-source voltage difference is written as Vdsat, the MOS tube enters a saturation region, the common amplifier and the current mirror CMOS tube need to work in the saturation region, and the larger the Vdsat is, the higher the current precision is for the current mirror structure.

The drain-source voltage difference of the tube is written as Vds, namely the voltage difference between the D stage and the S stage of the MOS tube.

The voltage difference between the gate and the source of the transistor is written as Vgs, namely the voltage difference between the G and the S stages of the MOS transistor.

Example 1

Fig. 1 is a circuit diagram of a current mirror according to the related art, as shown in fig. 1, the structure is a mature current mirror structure, and the operation principle of the current mirror in the related art is that by making Vgs of two NMOS transistors M1 and M2 identical and making both transistors operate in a saturation region, a mirror output current proportional to Iin is mirrored from Iout, the magnitude of the mirror current can be obtained according to the current formula iout=iin (Size 2/Size 1), where Size2 represents the channel width dimension of the M2 transistor, size1 represents the channel width dimension of the M1 transistor, and it can be seen from the formula that the output current of the current mirror can be changed by changing the channel dimension of the MOS transistor in the current mirror.

In addition, fig. 2 is a schematic diagram of the output current of the conventional current mirror provided according to the related art, and as shown in fig. 2, the abscissa represents the output current control gear of the conventional current mirror, and the current mirror represented by the line segment in the figure includes 256 gears; the ordinate represents the output current of the current mirror. As can be seen from the figure, the gain curve of the output current of the conventional current mirror with the change of the gear is a straight line, and the output current gradually increases from 0 with the change of the gear. For some loads, such as LED lamps, the LED lamps will not light up when the output current provided by the constant current source driving circuit does not reach the minimum value for lighting up the LED lamps. Until the output current can light the LED lamp, the gear adjustment performed on the constant current source driving circuit is meaningless before, and the adjustment significance of a plurality of output current adjustment gears of the current mirror is lost, so that the actual change range of the output current is greatly reduced.

Fig. 3 is a block diagram of a current generation circuit according to an embodiment of the present invention, and as shown in fig. 3, the current generation circuit 30 includes a current control module 32 and a target current generation module 34, and the current generation circuit 30 is described in detail below:

the current control module 32 is configured to receive the precision current and generate a global current according to the precision current.

The target current generation module 34 is connected to the current control module and is used for adjusting the current starting point of the global current.

The current generating circuit may be referred to as a constant current source driving circuit for driving a load, and the current generating circuit generates a global current, outputs the global current to the load after a predetermined process, and drives the load to perform an operation. Optionally, the load may be an LED lamp, and the current output to the LED may be adjusted by changing the global current of the constant current source driving circuit, so as to adjust the brightness of the LED lamp, and further control the display image of the LED display screen.

Alternatively, at least one of the precision current and the global current may be a zero temperature coefficient current, which is a current whose current value hardly changes with a temperature change. The current generating circuit can mirror the stable and accurate zero-temperature coefficient accurate current to the global current required by the load through the circuit structure.

In the above structure, the target current generation module 34 solves the technical problem that the global current generated according to the accurate current cannot drive the load when the current generation circuit is in a lower gear by adjusting the current start point of the global current. Optionally, the current control module may include a plurality of gears, and global currents with different current magnitudes may be generated and output according to the accurate currents corresponding to different gears, and the gears of the current control module may be referred to as gears of the current generation circuit or the constant current source driving circuit. The starting point of the global current can be the magnitude of the global current output by the current generating circuit when the current generating circuit is in the lowest gear, and the target current generating module can enable the global current output by the current generating circuit under the condition of being in the lowest gear to still successfully drive the load by adjusting the current starting point of the global current.

As an optional implementation manner, the target current generation module can generate a step current with a fixed size, and the step current is integrated into the global current, so that the function of raising the current value of the global current is achieved, the global current output by the current generation circuit under any gear is at least greater than the corresponding value of the step current, the output current output to the load according to the global current is ensured to stably drive the load, and for example, when the load is an LED, the problem that low gray cannot be started in the display process of the LED display screen due to the fact that the current value of the output current is too small is avoided.

In the above circuit configuration, a current generation circuit for generating a global current is employed, wherein the current generation circuit includes: the current control module receives the accurate current and generates global current according to the accurate current; the target current generation module is connected with the current control module and used for adjusting the current starting point of the global current, so that the purpose that the current generation circuit can successfully drive the load when generating the global current by adopting any gear in the full gears is achieved, the technical effect of reducing the waste of circuit structures in the current generation circuit in the constant current source driving circuit frame is achieved, and the technical problem that the global current generated by the traditional constant current source driving circuit cannot drive the load is solved.

Fig. 4 is a schematic diagram of global current provided according to an embodiment of the present invention, and as shown in fig. 4, the ordinate represents global current output by the current generation circuit, and the abscissa represents a gear of the current generation circuit. It can be seen that even though the current generating circuit has a gear of 0, the target current generating module can still change the current starting point of the global current by providing a "boost" current. Optionally, under the condition that the global current is used for driving the LED lamp, the current starting point can be set to be just slightly capable of lighting the current of the LED lamp, so that the effect that the global current output by the current generating circuit can light the LED lamp in all gears is achieved, and the situation that the global current output by the current generating circuit is too small to light the LED lamp when the current generating circuit is in partial low gears is avoided, and the gears lose the regulation significance.

As an optional embodiment, the current generating circuit may further include a bias module, where the bias module is connected to the current control module and is configured to provide an accurate current to the current control module. In this optional embodiment, in order to ensure that the current of the input current control module is zero temperature coefficient accurate current, the bias module may calibrate the input current to eliminate the current precision mismatch phenomenon of the input current, so as to obtain a stable and accurate current, and input the accurate current to the current control module.

As an alternative embodiment, the target current generation module may comprise at least one target current generation unit, which is connected to the current control module for adjusting the current starting point of the global current. In this optional embodiment, the target current generating module may also have a plurality of gears, and each target current generating unit may correspond to one gear of the target current generating module, so as to support the user to adjust the current starting point of the global current to a required current value.

As an alternative embodiment, the target current generating unit may include a first switching element and a current start point adjustment element, wherein the first switching element is configured to control the current start point adjustment element to be connected to the current control module; the current starting point adjusting element is connected with the current control module through the first switching element; and the target current generation unit is used for adjusting the current starting point of the global current by changing the connection state of the current starting point adjusting element and the current control module. It should be noted that, each target current generating unit may correspond to one gear of the target current generating module, so that the gear selection of the target current generating module may be controlled by the first switching element, and the current start point of the global current may be freely changed according to the minimum current value required for driving the load.

As an alternative embodiment, the current start point adjustment element may include a first field effect transistor, and the first switching element may be included in a single pole single throw switch, and it will be understood by those skilled in the art that the current start point adjustment element and the first switching element are illustrated as a field effect transistor and a single pole single throw switch, respectively, and do not constitute limitations on the current start point adjustment element and the first switching element, and any device that may perform the same effect as the field effect transistor and the single pole single throw switch in the present invention is included in the scope of the present invention. For example, the first switching element may also be a register switch.

As an alternative embodiment, the current generating circuit may further comprise a current gain adjustment module, wherein the current gain adjustment module is connected to the current control module and the target current generating module for adjusting the current gain of the global current.

In this alternative embodiment, when the constant current source driving circuit does not enable the current gain adjustment module, the current value of the global current increases linearly with the gear as shown in fig. 2; when the constant current source driving circuit starts the current gain adjusting module, the current gain adjusting module can adjust the current gain amplitude of the global current, wherein the gain amplitude of the current refers to changing the same gear of the constant current source driving circuit so that the amplitude of the output global current gain or the amplitude of the subtraction is changed and is reflected in the schematic diagram of the global current of the constant current source driving circuit, namely the slope of the broken line in fig. 5.

Fig. 5 is a schematic diagram of another global current provided according to an alternative embodiment of the present invention, and as shown in fig. 5, by adjusting the circuit structure of the current generating circuit by the current gain adjusting module, it is possible to implement that the gain magnitudes of the output global currents are different and the maximum value of the global currents is amplified when the same gear difference is changed.

As an alternative embodiment, the current gain adjustment module may comprise at least one current gain adjustment unit, wherein the current gain adjustment unit is connected to the current control module for adjusting the current gain of the global current. In this alternative embodiment, the current gain adjustment module may also have at least one gain stage. It should be noted that each current gain adjustment unit may correspond to one gear of the current gain adjustment module, and by changing the structure and the number of the current gain adjustment units connected to the current generation circuit, the gear of the current gain adjustment module may be changed, so as to change the current gain of the global current.

As an alternative embodiment, each current gain adjustment unit may comprise a second switching element and a current gain adjustment element, wherein the second switching element is configured to control the current gain adjustment element to be connected to the current control module; the current gain adjusting element is connected with the current control module through the second switching element; and the current gain adjusting unit is used for adjusting the current gain of the global current by changing the connection state of the current gain adjusting element and the current control module. In this embodiment, each time the current control module is connected to a current gain adjustment element, the current gain amplitude of the global current by the gear can be refined. That is, the current increase/decrease amplitude decreases by a certain value after one shift range is adjusted by one current gain adjusting element.

As an alternative embodiment, the current gain adjustment element may comprise a second field effect transistor, the second switching element comprising a single pole single throw switch. It will be appreciated by those skilled in the art that the current gain adjustment element and the second switching element are illustrated as field effect transistors and single pole single throw switches, respectively, and are not limiting of the current gain adjustment element and the second switching element, and any device that can achieve the same effect as a field effect transistor and a single pole single throw switch in the present invention is included in the scope of the present invention. For example, the second switching element may also be a register switch.

As an alternative embodiment, the current generating circuit may include a controller, wherein the controller is connected to the target current generating module and the current gain adjusting module, respectively, for adjusting the target current generating module and the current gain adjusting module according to the target value of the global current. The target value of the global current is a current value which the user hopes the global current to reach. After the controller obtains the target value of the global current, the current difference value can be determined by combining the current output value of the global current, a target gear is determined according to the current difference value and the gear state of the current generation circuit, and then the current generation circuit is regulated to the target gear by controlling the target current generation module and the current gain regulation module, and the value of the global current output when the current generation circuit is in the target gear is the target value.

Alternatively, the controller may adjust as follows: step S1, according to the current gear state, a current global current value and a target value of global current, firstly determining a reasonable target gear, so that the target gear is positioned in a position close to the middle of a total adjusting range; step S2, calculating the ratio of the current difference value to the gear difference value to obtain a target current gain (current value/gear); step S3, determining a target opening and closing state of each switch in the target current generation module and the current gain adjustment module according to the current gain (namely the current change value when each gear is currently adjusted) and the target current gain; s4, adjusting the state of each switch in the target current generation module and the current gain adjustment module to a target opening and closing state; and S5, adjusting the gear of the current control module from the current gear to the target gear.

The invention also provides a driving chip which can comprise any one of the current generating circuits for generating the output current for driving the load, and solves the technical problem that the load cannot be driven by the global current generated by the traditional constant current source driving circuit. The current generating circuit included in the driving chip can generate global current with adjustable current starting point and adjustable gain, and the driving chip can further process the global current to output the global current.

Fig. 6 is a circuit diagram of a current generation circuit provided in accordance with an alternative embodiment of the present invention. As shown in fig. 6, as an alternative embodiment, the current generation circuit may include a current control module 32, a target current generation module 34, a current gain adjustment module 36, and a bias module 38. The following detailed description of the current generating circuit shown in fig. 6 is provided, and it will be understood by those skilled in the art that the following description of the circuit structure is only a preferred embodiment and is not intended to limit the technical solution of the present invention, and those skilled in the art may modify and modify the local structure based on the inventive concept of the present invention, and these modifications and modifications should be included in the scope of the present invention.

The left Iin portion of FIG. 6 includes a structure for providing an input current, rext is a 6 Kohm external high precision resistor, the op-amp achieves voltage clamping uniformity, and a zero temperature coefficient input current of 200uA is generated at the drain of the NMOS transistor and provided to the bias block 38. The bias module 38 adjusts the input current, and then outputs a 200uA accurate current to the current control module 32 located at the Im-Iout part, and the accurate current is adjusted by the bias module 38 to ensure accuracy and stability, so that the problem of current precision mismatch can not occur. The current control module 32 generates a global current according to the accurate current, the current control module 32 is simultaneously connected with the target current generation module 34 and the current gain adjustment module 36, a "lifting" current is obtained through the target current generation module 34, the current gain amplitude of the global current is adjusted through the current gain adjustment module 36, the global current is generated in a circuit for generating the Iout part, the global current can be processed to obtain a driving load current, and a circuit structure for further processing the global current is not shown in the figure. The specific structure and functions of each circuit module in fig. 6 are described in detail below.

The bias module 38 may be a PMOS current mirror as shown, connected to a current source, from which a relatively stable 200uA current is drawn. The current is replicated through the PMOS current mirror 1:1 and flows out from the Y point, and the accurate current input into the current control module is obtained.

The current control module 32 may adopt an NMOS transistor current mirror structure with 8 gears, in which the NMOS transistor at the left side 32i of the current mirror structure is connected in parallel with two NMOS transistors in the current gain adjustment module 36, and the NMOS transistor at the right side of the current mirror structure with 8 groups of NMOS transistors corresponding to 8 gears is connected in parallel with the target current generation module 34. The <0> to <7> connected to the NMOS transistor may be register switches. In addition, the current generating circuit may further include an operational amplifier for clamping the electric potential, for example, clamping the electric potential of the X point and the Y point in agreement.

In this alternative embodiment, i may be used to represent a unit channel size of the MOS transistor, where 64i is the channel size of the MOS transistor, and since the size of the MOS transistor and the current size are positively correlated, it may be considered that the current flowing in the MOS transistor after the current is turned on is i and 64i. In fig. 6, the current control module receives a precise current of 200uA, and mirrors a global current through the current mirror structure, so that the constant current source driving circuit can output a current to a load according to the global current, so as to drive the load such as an LED lamp. Since the magnitude of the mirror current of the current mirror can be determined according to the current formula iout=iin (Size 2/Size 1), iin represents the current input to the current mirror, iout represents the current mirrored by the current mirror, size1 represents the sum of the MOS transistor channel width dimensions on the input current side in the current mirror, and Size2 represents the sum of the MOS transistor channel width dimensions on the output current side of the current mirror. Therefore, a MOS transistor (not shown) on one side of the target current generating module may be controlled by a first switching element (not shown) to be connected to the current control module 32, and a MOS transistor in the current gain adjusting module 36 may be controlled by a second switching element to be connected to the current control module 32, so that the ratio of the sum of the sizes of the MOS transistors on two sides of the current mirror may be changed, and the magnitude of the mirrored global current may be further changed, so as to realize the regulation and control of the mirrored output global current.

Optionally, when the switches of the current gain adjustment module 36 and the target current generation module 34 are turned off, if the current control module 32 is tuned to the highest gear, the total size ratio of the MOS transistor channels on the left and right sides of the NMOS transistor current mirror is 32i/128i, so it can be known that iout=4×im=800 uA, where Im represents the accurate current obtained after passing through the PMOS current mirror. Because the output end of the NMOS current mirror adopts 8 output side NMOS tubes (namely NMOS tubes in the current regulation module 32 frame) with exponentially increasing indexes, the 800uA can be divided into 256 gears, and the current gain corresponding to each gear is 3.125uA.

Because 2 parallel NMOS tubes (or more, according to application scene design circuits) are introduced at the current input side of the current mirror, the two NMOS tubes, namely, the two NMOS tubes in the frame of the current gain adjusting module 36, are connected in parallel by adopting a register switch, when the 32i NMOS tube is integrated, the size ratio of the current mirror at the left side and the right side is 64i/128i, so that iout=2xIm=400 uA and 1.5625 uA/gear can be known, and a new gain speed of the output current which is improved along with the gear is provided. Conversely, the original 32i can be split into two 16i, and the current mirror size ratio of the left side and the right side is 16i/128i, so that iout=8×im=1600 uA, 6.25 uA/gear and the like can be known. By the alternative embodiment, any current gain speed can be configured, and the configuration with the best current matching performance can be selected, so that the accuracy of the driving output current of the load is ensured.

Referring to fig. 5, if Size1 on the current input side of the current mirror becomes 2 times as large as that of Size1 on the input side according to the formula iout=iin (Size 2/Size 1), the gain of the output current generated by increasing the MOS transistor Size i on the current output side is only one half of that of the original MOS transistor Size, and the slope of the broken line in fig. 5 is reduced. Through the optional embodiment, the gain amplitude corresponding to the gear of different output sides of the current mirror can be changed according to the requirement, the fine adjustment of the output current when the output current is smaller is realized, and the adjustment precision of the current is improved.

Optionally, the width dimensions of the multiple current output side MOS transistors of the NMOS transistor current mirror may be sequentially increased. For example, the size of the NMOS transistor on the current output side may be gradually increased in an exponential form of 2 on the basis of the reference size. For example, in the case where the size of the first output side NMOS is 1, the size of each output side NMOS after is 2,4,8,16, … …, respectively, reduces the number of output side NMOS transistors required to traverse all output current steps by employing multiple current output side NMOS transistors of increasing size. For example, if all the output side NMOS transistors are of the reference size, when the global current to be output needs to reach 129 steps, 129 output side NMOS transistors of the reference size need to be connected in parallel to the output side of the current mirror; however, if the layout of the NMOS transistors on the output side is increased, only two NMOS transistors with reference size1 and reference size 128 on the output side can be started, so that the hardware structure required in the current mirror is greatly saved.

It should be noted that, for the MOS transistor, the influence factor of the current accuracy is very complex, specifically, the output current of the MOS transistor is determined by Vdsat, vgs, vds, vth, and size, so that the problem can only be removed and cannot be completely solved if only one parameter variation Iout deviates from the theoretical value. Further, the accuracy of the current output by the MOS is substantially positively correlated with the channel size of the tube, and therefore, when Iout takes a small value from zero, the accuracy of the output current of the MOS tube is hardly ensured. Therefore, optionally, the target current generation module can avoid the situation that the current value of the global current is too small by regulating and controlling the current starting point of the global current generated by the current control module, and can regulate the gain of the global current of the current control module by the current gain regulation module, so that the current precision of the global current is improved by the method.

The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.

In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (10)

1. A current generation circuit, comprising: a current control module and a target current generation module, wherein,

the current control module receives accurate current and generates global current according to the accurate current;

the target current generation module is connected with the current control module and used for adjusting the current starting point of the global current.

2. The current generation circuit of claim 1, wherein the current generation circuit further comprises: and the current gain adjusting module is connected with the current control module and the target current generating module and is used for adjusting the current gain of the global current.

3. The current generation circuit according to claim 1 or 2, wherein the target current generation module comprises at least one target current generation unit connected to the current control module for adjusting a current start point of the global current.

4. A current generation circuit according to claim 3, wherein the target current generation unit includes: a first switching element and a current start point adjustment element, wherein,

the first switching element is used for controlling the current starting point adjusting element to be connected with the current control module;

the current starting point adjusting element is connected with the current control module through the first switching element;

the target current generating unit is used for adjusting the current starting point of the global current by changing the connection state of the current starting point adjusting element and the current control module.

5. The current generation circuit of claim 4, wherein the current start point adjustment element comprises: the first switching element includes a single pole single throw switch.

6. The current generation circuit of claim 2, wherein the current gain adjustment module comprises: and the current gain adjusting unit is connected with the current control module and used for adjusting the current gain of the global current.

7. The current generation circuit of claim 6, wherein each of the current gain adjustment units comprises: a second switching element and a current gain adjustment element, wherein,

the second switching element is used for controlling the current gain adjusting element to be connected with the current control module;

the current gain adjusting element is connected with the current control module through the second switching element;

the current gain adjusting unit is used for adjusting the current gain of the global current by changing the connection state of the current gain adjusting element and the current control module.

8. The current generation circuit of claim 7, wherein the current gain adjustment element comprises: and a second field effect transistor, the second switching element comprising a single pole single throw switch.

9. The current generation circuit of claim 2, further comprising: and the controller is respectively connected with the target current generation module and the current gain adjustment module and is used for adjusting and controlling the target current generation module and the current gain adjustment module according to the target value of the global current.

10. A driver chip, characterized in that the driver chip comprises the current generating circuit of any one of claims 1 to 9.

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