Voltage regulators, chips, power supplies and electronic devices

Abstract

The present disclosure relates to a voltage regulator, a chip, a power supply, and an electronic device. The voltage regulator includes a voltage input module (10) for receiving an input voltage, a current determination module (20) electrically connected to the voltage input module (10) for determining a regulated current based on the input voltage and a load current, a control module (30) electrically connected to the current determination module (20) for outputting a control signal based on the regulated current, and a voltage output module (40) electrically connected to the voltage input module (10), the current determination module (20), and the control module (30) for outputting a target voltage based on the control signal and the input voltage. The voltage regulator can output a stable target voltage, can respond quickly to changes in the input voltage, is reliable and stable, has high environmental compatibility, and is adaptable to various load applications.

Description

[Technical field]

[0001] The present disclosure relates to the technical field of integrated circuits, and in particular to voltage regulators, chips, power supplies and electronic devices. [Background technology]

[0002] There is a TDMA (Time Division Multiple Access) test requirement for the power management chip of AMOLED (Active-matrix organic light-emitting diode): the input power is subjected to interference at regular intervals, jumping 500mV up or down within 10μS, and the 500mV jump continues for at least 500μS. When such interference occurs, the output of the DC-DC Boost architecture will inevitably have an overshoot or undershoot, and such disturbances must be less than 20mV for a load of 200mA or less, and less than 60mV for a load of 1A or less.

[0003] However, in related techniques, when a disturbance occurs in the input power supply, the change cannot be quickly followed, and disturbances such as overshoot and undershoot often occur in the output voltage, making the output voltage unstable. Summary of the Invention

[0004] In view of this, the present disclosure: a voltage input module for receiving an input voltage; a current determination module electrically connected to the voltage input module for determining a regulated current based on the input voltage and a load current; a control module electrically connected to the current determination module for outputting a control signal based on the regulated current; A voltage output module is electrically connected to the voltage input module, the current determining module and the control module, for outputting a target voltage based on the control signal and the input voltage.

[0005] In one possible embodiment, the current determination module comprises current detection means, signal conversion means and current determination means, the current sensing means is used to identify a load current and to obtain a sensed voltage based on the load current; the signal conversion means is electrically connected to the current detection means and is used to convert the detection voltage into a digital signal; The current determining means is electrically connected to the signal converting means and is used for determining a regulating current based on the digital signal and the input voltage.

[0006] In one possible embodiment, the current determining means comprises a first operational amplifier, a first transistor, a second transistor, a third transistor, a fourth transistor, a number of fifth transistors, a number of switches, and a first resistor; A positive input terminal of the first operational amplifier is used to receive the input voltage, a negative input terminal of the first operational amplifier is electrically connected to a source of the first transistor and a first terminal of the first resistor, an output terminal of the first operational amplifier is electrically connected to a gate of the first transistor, and a second terminal of the first resistor is grounded; a drain of the first transistor electrically connected to a source of the second transistor, a gate of the second transistor, and a gate of the third transistor; a drain of the second transistor and a drain of the third transistor are used to receive a power supply voltage; a source of the third transistor electrically connected to a drain of the fourth transistor, a gate of the fourth transistor, and gates of a plurality of fifth transistors; a source of the fourth transistor and sources of the fifth transistors are grounded; a drain of each fifth transistor is electrically connected to a first end of a corresponding switch, and a control end of each switch is used to receive the digital signal and turn on or off according to the digital signal; The second end of each switch is electrically connected and used to output the regulated current.

[0007] In one possible embodiment, the number of bits of the digital signal is the same as the number of switches, and each bit of the digital signal is used to control the on-state of a corresponding switch.

[0008] In one possible embodiment, the current detection means includes a sixth transistor, a seventh transistor, a second operational amplifier, a second resistor, and a first capacitor; A gate of the sixth transistor is used for receiving the control signal, a drain of the sixth transistor is electrically connected to the voltage input module, and a source of the sixth transistor is electrically connected to the positive input terminal of the second operational amplifier and the drain of the seventh transistor; a negative input terminal of the second operational amplifier electrically connected to the voltage output module, an output terminal of the second operational amplifier electrically connected to the gate of the seventh transistor, and a source of the seventh transistor electrically connected to the first terminal of the second resistor and the first terminal of the first capacitor; a second end of the second resistor and a second end of the first capacitor are grounded; The first end of the second resistor is used to output the detection voltage.

[0009] In one possible embodiment, the voltage output module includes an eighth transistor, a ninth transistor, a tenth transistor, an eleventh transistor, a third operational amplifier, a third resistor, a fourth resistor, and a second capacitor; a gate of the eighth transistor is electrically connected to the gate of the sixth transistor, the gate of the tenth transistor and the control module, and is used to receive the control signal; a drain of the eighth transistor is electrically connected to the drain of the ninth transistor, the drain of the sixth transistor, the drain of the tenth transistor and the voltage input module; a source of the eighth transistor is electrically connected to a negative input terminal of the third operational amplifier, a negative input terminal of the second operational amplifier, a first terminal of the third resistor, and a first terminal of the second capacitor; a second terminal of the third resistor is electrically connected to the control module and a first terminal of the fourth resistor; a second terminal of the fourth resistor is grounded; and a second terminal of the second capacitor is grounded; a gate of the ninth transistor is electrically connected to the control module and is used to receive the control signal, and a source of the ninth transistor is grounded; a positive input terminal of the third operational amplifier is electrically connected to a source of the tenth transistor and a drain of the eleventh transistor, and an output terminal of the third operational amplifier is electrically connected to a gate of the eleventh transistor; a source of the eleventh transistor electrically connected to the current determining module and the control module; A first end of the third resistor is used to output the target voltage.

[0010] In one possible embodiment, the voltage input module includes an input capacitor and an input inductor, a first end of the input capacitor is electrically connected to a first end of the input inductor and is used to receive the input voltage, and a second end of the input capacitor is grounded; A second end of the input inductor is electrically connected to a drain of the ninth transistor, a drain of the eighth transistor, a drain of the sixth transistor, and a drain of the tenth transistor.

[0011] According to one aspect of the present disclosure, there is provided a chip including the voltage regulator.

[0012] According to one aspect of the present disclosure, a power supply is provided that includes the chip.

[0013] According to one aspect of the present disclosure, there is provided an electronic device including the power supply.

[0014] In one possible embodiment, the electronic device comprises a display, a smartphone or a mobile device.

[0015] According to the above-mentioned device, in the embodiment of the present disclosure, the current determination module determines the regulating current based on the input voltage and the load current, when the input voltage changes, the current determination module can quickly respond to generate the regulating current according to the load current, and output the regulating current to the control module to generate a control signal, and the voltage output module can output a stable target voltage based on the control signal, and can realize a stable output of voltage under various loads without excessive overshoot or undershoot. The voltage regulator according to the present disclosure can output a stable target voltage, can quickly respond to changes in the input voltage, is reliable and stable, has high environmental compatibility, and can be applied to various loads.

[0016] Other features and aspects of the present disclosure will become apparent from the following detailed description of illustrative embodiments taken in conjunction with the drawings.

[0017] The drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features and aspects of the present application and, together with the specification, serve to explain the principles of the present disclosure. [Brief description of the drawings]

[0018] [Figure 1] 1 shows a schematic diagram of a voltage regulator according to one embodiment of the present disclosure. [Diagram 2] 1 shows a schematic diagram of a voltage regulator according to one embodiment of the present disclosure. [Diagram 3] 1 shows a schematic diagram of a current determining means according to an embodiment of the present disclosure; [Figure 4] 1 shows a schematic diagram of voltage changes in a DC-DC architecture according to the related art; [Diagram 5] 2 shows a schematic diagram of voltage change in a voltage regulator according to one embodiment of the present disclosure; [Figure 6] 1 shows a schematic diagram of voltage change in a voltage regulator when not used in conjunction with load current control; [Figure 7] 1 shows a schematic diagram of voltage change in a voltage regulator when used in conjunction with load current control. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Various exemplary embodiments, features, and aspects according to the present disclosure are described in detail below with reference to the drawings, in which like reference numerals indicate functionally identical or similar elements, and in which various aspects of the embodiments are illustrated, but which are not necessarily drawn to scale unless otherwise indicated.

[0020] The word "exemplary" herein means "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or superior over other embodiments.

[0021] In addition, in order to better explain the present disclosure, many specific details are shown in the following specific embodiments. It should be understood by those skilled in the art that the present disclosure can be similarly implemented without any specific details. In some instances, in order to emphasize the gist of the present disclosure, methods, means, elements and circuits that are well known to those skilled in the art are not described in detail.

[0022] Referring to FIG. 1, there is shown a schematic diagram of a voltage regulator according to one embodiment of the present disclosure.

[0023] As shown in FIG. 1, the voltage regulator comprises: a voltage input module 10 for receiving an input voltage; a current determination module 20 electrically connected to the voltage input module 10 for determining a regulated current based on the input voltage and a load current; a control module 30 electrically connected to the current determination module 20 for outputting a control signal based on the regulated current; a voltage output module 40 electrically connected to the voltage input module 10, the current determining module 20 and the control module 30, for outputting a target voltage according to the control signal and the input voltage.

[0024] According to the above-mentioned device, in the embodiment of the present disclosure, the current determination module determines the regulating current based on the input voltage and the load current, when the input voltage changes, the current determination module can quickly respond to generate the regulating current according to the load current, and output the regulating current to the control module to generate a control signal, and the voltage output module can output a stable target voltage based on the control signal, and can realize a stable output of voltage under various loads without excessive overshoot or undershoot. The voltage regulator according to the present disclosure can output a stable target voltage, can quickly respond to changes in the input voltage, is reliable and stable, has high environmental compatibility, and can be applied to various loads.

[0025] The voltage regulator according to the present disclosure may include a DC-DC conversion circuit (direct current-direct current conversion circuit), and can output a stable and reliable target voltage based on an input DC voltage.

[0026] Referring to FIG. 2, there is shown a schematic diagram of a voltage regulator according to one embodiment of the present disclosure.

[0027] In one possible embodiment, as shown in FIG. 2, the current determination module 20 includes a current detection means 220, a signal conversion means 230 and a current determination means 210; The current detection means 220 is used to identify a load current and obtain a detection voltage based on the load current; the signal conversion means 230 is electrically connected to the current detection means 220 and is used for converting the detection voltage into a digital signal; The current determining means 210 is electrically connected to the signal converting means 230 and is used for determining the regulating current Isink based on the digital signal and the input voltage.

[0028] With additional reference to FIG. 3, there is shown a schematic diagram of a current determining means in one embodiment according to the present disclosure.

[0029] In one possible embodiment, as shown in FIG. 3, the current determining means includes a first operational amplifier OP1, a first transistor Q1, a second transistor Q2, a third transistor Q3, a fourth transistor Q4, a plurality of fifth transistors Q5, a plurality of switches S1, and a first resistor R1; A positive input terminal of the first operational amplifier OP1 is used to receive the input voltage Vin, a negative input terminal of the first operational amplifier OP1 is electrically connected to a source of the first transistor Q1 and a first terminal of the first resistor R1, an output terminal of the first operational amplifier OP1 is electrically connected to a gate of the first transistor Q1, and a second terminal of the first resistor R1 is grounded; The drain of the first transistor Q1 is connected to the drain of the second transistor Q2. drain , electrically connected to the gate of the second transistor Q2 and the gate of the third transistor Q3; The second transistor Q2 sauce and the third transistor Q3 sauce is used to receive the power supply voltage Vdd, The third transistor Q3 drainis electrically connected to the drain of the fourth transistor Q4, the gate of the fourth transistor Q4, and the gates of the plurality of fifth transistors Q5; The source of the fourth transistor Q4 and the source of the fifth transistor Q5 are grounded, A drain of each fifth transistor Q5 is electrically connected to a first end of a corresponding switch S1, and a control end of each switch S1 is used to receive the digital signal and turn on or off according to the digital signal; The second end of each switch S1 is electrically connected and used for outputting the regulated current Isink.

[0030] With the above device, in the embodiment of the present disclosure, the output voltage can be stabilized by responding to the change in the input voltage by the current determining means, and determining the adjustment current Isink according to the digital signal obtained by the load current to compensate for the change in the input voltage and generate a control signal, thereby reducing the variability of the output voltage when the input voltage changes and improving the environmental compatibility of the device.

[0031] In the embodiment of the present disclosure, the number of the fifth transistors and the number of the switches are not limited, and those skilled in the art can set them as necessary. In one example, the number of the fifth transistors may be the same as the number of the switches, and the connection relationship between the drain of each fifth transistor and the control module is controlled by the corresponding switch. In the embodiment of the present disclosure, the type and specific embodiment of the switch are not limited, and in one example, the switch S1 may be a transistor, a single-pole single-throw switch, etc.

[0032] With the above-mentioned device, in the embodiment of the present disclosure, when the input voltage changes, the device can quickly respond to the change in the input voltage, determine the adjustment current according to the load current, and compensate the input of the control module, thereby reducing the fluctuation of the output voltage, adapting to various load environments, and improving environmental compatibility.

[0033] Continuing to refer to FIG. 2, in one possible embodiment, the current detection means 220 may include a sixth transistor Q6, a seventh transistor Q7, a second operational amplifier OP2, a second resistor R2, and a first capacitor C1, as shown in FIG.

[0034] Wherein, the gate of the sixth transistor Q6 is used for receiving the control signal, the drain of the sixth transistor Q6 is electrically connected to the voltage input module, and the source of the sixth transistor Q6 is electrically connected to the positive input terminal of the second operational amplifier OP2 and the drain of the seventh transistor Q7; The negative input terminal of the second operational amplifier OP2 is electrically connected to the voltage output module, the output terminal of the second operational amplifier OP2 is electrically connected to the gate of the seventh transistor Q7, and the source of the seventh transistor Q7 is electrically connected to the first terminal of the second resistor R2 and the first terminal of the first capacitor C1; A second end of the second resistor R2 and a second end of the first capacitor C1 are grounded; A first terminal of the second resistor R2 is used to output the detection voltage Vctrl.

[0035] With the above-described device, in the embodiment of the present disclosure, the load current can be detected by a current detection means, a detection voltage is determined based on the detected load current, and an adjustment current is determined based on the detection voltage, thereby compensating for changes at the load end and realizing control of a control signal based on various load conditions.

[0036] In one example, in the detection, the current detection means may average the current of the eighth transistor by (1-D)T*IL to obtain a detection voltage Vtrcl=(1-D)T*IL*R, where D represents the duty ratio, T represents the clock cycle, IL represents the inductance of the input inductor L, and R represents the resistance value of the second resistor R2.

[0037] The current detection means may convert the value of the load current into a detection voltage Vctrl=α*Id, where α is a preset parameter and Id is the load current.

[0038] With the above device, in the embodiment of the present disclosure, a rapid response to the input voltage can be realized and compensation can be performed for various loads, so that the device can adapt to various loads and improve environmental compatibility.

[0039] In one possible embodiment, the signal conversion means 230 may be realized by a dedicated hardware circuit or by a conventional hardware circuit.

[0040] In one example, the signal conversion means may be realized by a digital circuit, for example, the signal conversion means 230 may be provided as a state machine including a register and a logic circuit, or may be realized by a digital-to-analog converter, and the embodiments of the present disclosure are not limited to a specific embodiment of the signal conversion means 230.

[0041] In one possible embodiment, the number of bits of the digital signal is the same as the number of the switches, and each bit of the digital signal is used to control the on state of a corresponding switch. The digital signal obtained by the load current may be used as a control signal for multiple switches, and the output terminal of the signal conversion means 230 is electrically connected to the control terminal of each switch, thereby realizing the control of each switch by the digital signal.

[0042] In one example, when the signal conversion means 230 receives the detection voltage Vctrl output by the current detection means 220, the signal conversion means 230 converts the detection voltage Vctrl into a digital signal Dctr1. <x:0>A signal conversion may be performed on the detection voltage Vctrl to convert it into: where X denotes the most significant bit of the digital signal and X+1 may be equal to the number of switches in the current determining means.

[0043] In one example, different digital signals may be determined for different load currents, so that the switches in the current determining means are turned on in different states, and the current determining means can output a corresponding regulated current based on the load current. For example, when the load current is large, the number of switches controlled by the digital signals is large, and the regulated current output by the current determining means is also large. This allows the control module to control the output voltage of the voltage output module to be stable by realizing compensation or adjustment to the input of the control module.

[0044] In one example, a conversion parameter (e.g., the number of bits of a digital signal) of the signal conversion means 230 may be configured according to the number of switches. When the circuit is in operation, the signal conversion means 230 can obtain a digital signal based on the configured conversion parameter and the input detection voltage Vctrl to control the on state of each switch.

[0045] In one example, the signal conversion means 230 may be configured to automatically read parameter information (e.g., the number of switches) of the current determination means and autonomously configure the conversion parameters (e.g., the number of bits of the digital signal) according to the number of switches. When the detection voltage Vctrl is received, a digital signal can be obtained based on the conversion parameters and the input detection voltage Vctrl to control the on state of each switch.

[0046] With the above device, the signal conversion means in the embodiment of the present disclosure can determine the magnitude of the regulated current based on the detection voltage output by the current detection means, so that the device can quickly respond to the change in the input voltage and adapt to various load conditions, and reduce the fluctuation of the output voltage and stabilize the output voltage when the input voltage changes under various loads.

[0047] In one possible embodiment, as shown in FIG. 2, the voltage output module 40 may include an eighth transistor Q8, a ninth transistor Q9, a tenth transistor Q10, an eleventh transistor Q11, a third operational amplifier OP3, a third resistor R3, a fourth resistor R4, and a second capacitor C2.

[0048] Wherein, the gate of the eighth transistor Q8 is electrically connected to the gate of the sixth transistor Q6, the gate of the tenth transistor Q10 and the control module, and is used to receive the control signal; the drain of the eighth transistor Q8 is electrically connected to the drain of the ninth transistor Q9, the drain of the sixth transistor Q6, the drain of the tenth transistor Q10 and the voltage input module; The source of the eighth transistor Q8 is electrically connected to the negative input terminal of the third operational amplifier OP3, the negative input terminal of the second operational amplifier OP2, the first terminal of the third resistor R3 and the first terminal of the second capacitor C2, the second terminal of the third resistor R3 is electrically connected to the control module and the first terminal of the fourth resistor R4, the second terminal of the fourth resistor R4 is grounded, and the second terminal of the second capacitor C2 is grounded; The gate of the ninth transistor Q9 is electrically connected to the control module and is used to receive the control signal, and the source of the ninth transistor Q9 is grounded; A positive input terminal of the third operational amplifier OP3 is electrically connected to a source of the tenth transistor Q10 and a drain of the eleventh transistor Q11, and an output terminal of the third operational amplifier OP3 is electrically connected to a gate of the eleventh transistor Q11. The source of the eleventh transistor Q11 is electrically connected to the current determining module and the control module; The first end of the third resistor R3 is used to output the target voltage.

[0049] With the above device, the voltage output module of the embodiment of the present disclosure can realize a voltage output based on the control signal and the input voltage from the voltage input module so as to output a stable target voltage.

[0050] In one possible embodiment, the target voltage may be obtained by the following formula: Vout = Vin / (1-D) However, D may represent the duty ratio of the control signal.

[0051] Therefore, the present disclosure can quickly respond to changes in the input voltage and output the required target output voltage by adjusting the duty ratio of the control signal.

[0052] Below, a description is given of possible embodiments of the voltage input module 10. It should be understood that the following description is illustrative and is not intended to limit the present disclosure.

[0053] In one possible embodiment, the voltage input module 10 may include an input capacitor Cin and an input inductor L, as shown in FIG.

[0054] Wherein, a first end of the input capacitor Cin is electrically connected to a first end of the input inductor L and is used to receive the input voltage, and a second end of the input capacitor Cin is grounded; A second end of the input inductor L is electrically connected to the drain of the ninth transistor Q9, the drain of the eighth transistor Q8, the drain of the sixth transistor Q6, and the drain of the tenth transistor Q10.

[0055] It should be understood that although the present disclosure has been described using an input capacitor as an example, the present disclosure is not limited thereto. In other embodiments, the input capacitor may be replaced with an input capacitor network made of multiple capacitors, and the input capacitor network may include multiple capacitors, and the present disclosure does not limit the connection relationship and number thereof.

[0056] In one possible embodiment, the input inductor L may be provided as a plurality of inductances or may be replaced by a plurality of inductances. The connection method of the plurality of inductances may be a series connection, a parallel connection, or a combination thereof. In the present disclosure, the number of inductances included in the input inductor L and the connection relationship are not limited.

[0057] Below, a description is given of possible implementations of the control module 30. It should be understood that the following description is illustrative and does not limit the present disclosure.

[0058] In one possible embodiment, as shown in FIG. 2, the control module 30 may include an error amplifier gm, a reference resistor Rea, a reference capacitor Cea, a comparator CMP, an oscillator, a flip-flop, a pulse width modulation PWM controller (PWM Control Driver), a current source Iramp, a reset switch Vreset, a capacitor Cramp, and a sampling resistor Rramp.

[0059] Here, the positive end of the error amplifier gm is electrically connected between the third resistor and the fourth resistor, and is used to input the feedback voltage signal Vfb of the voltage output module 40, the negative end of the error amplifier gm is used to input the reference voltage Vref, and the output end of the error amplifier gm is electrically connected to the first end of the reference resistor Rea and the negative end of the comparator CMP; A second end of the reference resistor Rea is electrically connected to a first end of the reference capacitor Cea, and a second end of the reference capacitor Cea is grounded; The positive end of the comparator CMP is electrically connected to a current source Iramp, a first end of a capacitor Cramp and a first end of a reset switch, and is used to input a comparison voltage Vramp; the output end of the comparator CMP is electrically connected to a first end R of the flip-flop; The output end of the current determination module is electrically connected to the second end of the reset switch, the second end of the capacitor Cramp and the first end of the sampling resistor Rramp, and outputs the regulating current Isink, and the second end of the sampling resistor Rramp is grounded; The second terminal S of the flip-flop is electrically connected to the output terminal of the oscillator and is used to receive the clock signal CLK output by the oscillator, and the output terminal Q of the flip-flop is electrically connected to the input terminal of the PWM controller; A first output terminal of the PWM controller is electrically connected to the gate of the ninth transistor, and a second output terminal of the PWM controller is electrically connected to the gate of the eighth transistor, the gate of the tenth transistor, and the gate of the sixth transistor.

[0060] In one possible embodiment, said flip-flop comprises: When the input to the first terminal R becomes high level (1), the output of the output terminal Q becomes 1, When the input to the second terminal S becomes a high level, the output from the output terminal Q becomes 0.

[0061] In one possible embodiment, the PWM controller comprises: When the input to the input terminal becomes 1, the output becomes 1, It is configured so that when the input to the input terminal becomes 0, the output becomes 0.

[0062] With the above device, the control module of the embodiment of the present disclosure can adjust the control signal based on the regulated current, thereby reducing fluctuations in the voltage output by the voltage output module and maintaining the stability of the output voltage.

[0063] In an embodiment of the present disclosure, the current determining module may include a current determining means and / or a second determining means.

[0064] In one example, the current determination module may be configured to include only a current determination means. In a possible embodiment in which the current determination module includes a current determination means, when the input voltage increases, for example when Vin changes by ΔVin, Vin is input to the current determination means, and the current determination means may determine the change in the adjustment current Isink as ΔIsink=gm1*ΔVin. Here, gm1 indicates a preset adjustment parameter, Vin indicates the input voltage, and "*" indicates a multiplication process. In this way, the initial level of Vramp changes by gm1*ΔVin*Rramp, and this change ensures that the output of Vea does not change as much as possible. When Vref is unchanged, it means that the change in Vfb is small, i.e., the change in ΔVout is small, thereby reducing the fluctuation of the output voltage. In this way, the voltage output module 40 can output a stable target voltage.

[0065] In this way, when a regulated current is input to the control module, the control module can adaptively adjust the magnitude of the output voltage by compensating for changes in the input voltage using the regulated current and generating a control signal, thereby reducing the fluctuation of the output voltage.

[0066] In the embodiments of the present disclosure, the specific value of gm1 is not limited, and a person skilled in the art can determine the value by simulation as necessary.

[0067] Referring to FIG. 4, a schematic diagram of voltage changes in a related art DC-DC architecture is shown.

[0068] Referring to FIG. 5, a schematic diagram of voltage change in a voltage regulator according to one embodiment of the present disclosure is shown.

[0069] As shown in Figure 4, in the related art, when the input voltage Vin changes, the change in the voltage output Vout acts on the error amplifier gm to affect Vea. The larger the change in Vea, the slower the loop adjusts the new duty ratio D, so that the output voltage becomes very large with the input voltage jumping up or down. In this case, the peak-to-peak value of the output voltage Vout can reach 130mV.

[0070] As shown in FIG. 5, when the current determining module includes a current determining means, the regulating current is determined by the current determining means in the embodiment of the present disclosure to control the control module, so that the fluctuation of the output voltage can be greatly reduced, and the peak-to-peak value of the output voltage is only 30mV.

[0071] According to this scheme, it is possible to improve the response to the change in the input voltage, and it can be seen that the peak-to-peak value Vpp of the change in the output voltage is reduced from 130 mV to 30 mV.

[0072] In order to adapt to changes in load, the current determining module of the embodiment of the present disclosure may further include a current detecting means and a signal converting means, where the current detecting means converts the detected load current into a detected voltage, the signal converting means converts the detected voltage into a digital signal and inputs the digital signal into the current determining means, and the current determining means can determine an adjustment current according to the digital signal and the input voltage to act on the control module, so that the control module can quickly respond to changes in the input voltage and adapt to various load situations.

[0073] Referring to FIG. 6, a schematic diagram of voltage change in a voltage regulator when not used in conjunction with load current control is shown.

[0074] Referring to FIG. 7, there is shown a schematic diagram of voltage change in a voltage regulator when used in conjunction with load current control.

[0075] As shown in Fig. 6, when gm1 is determined in the current determining means, the load magnitude must be set in advance, so the balance point is selected between a heavy load and a light load, but if the load is too light or too heavy, compensation is often insufficient or overflows. Therefore, if the load current detection by the second determining means in Fig. 6 is not adopted, the voltage regulator cannot adapt to changes in the load, and when the load (load current Id) changes, the peak-to-peak value of the output voltage change ΔVout fluctuates greatly (Vpp fluctuates from 20mV to 50mV).

[0076] As shown in Fig. 7, a current detection means is provided to detect the load current, and a digital signal is determined by a signal conversion means, so that the current determination means determines the regulating current based on the digital signal and the input voltage to compensate the input of the control module. This allows the voltage regulator to not only respond quickly to changes in the input voltage, but also compensate for various loads, and the peak-to-peak value Vpp of the fluctuation range of the output voltage Vout is 25mV or less under various loads. This improves the environmental compatibility of the device, and the behavior of the power supply to fastline excitation in TDMA testing meets the needs of SPEC, and meets the TDMA test requirements of AMOLED in various application environments.

[0077] It should be understood that the present disclosure does not limit the selection of each device in the control module 30 or the selection of the reference voltage, and those skilled in the art can determine it according to their needs.

[0078] Although the embodiments of the present disclosure have been described above, the above description is merely illustrative and not exhaustive, and is not limited to the embodiments disclosed. Various modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the embodiments described. The terms selected in this specification are intended to appropriately interpret the principles, practical applications, or improvements to existing technology of the embodiments, or to allow other skilled in the art to understand the embodiments disclosed in this specification.

Claims

1. a voltage input module for receiving an input voltage; a current determination module electrically connected to the voltage input module for determining a regulated current based on the input voltage and a load current; a control module electrically connected to the current determination module for outputting a control signal based on the regulated current; a voltage output module electrically connected to the voltage input module, the current determination module and the control module, for outputting a target voltage based on the control signal and the input voltage; The current determining module includes a current sensing means, a signal converting means, and a current determining means; the current sensing means is used to identify a load current and to obtain a sensed voltage based on the load current; the signal conversion means is electrically connected to the current detection means and is used to convert the detection voltage into a digital signal; The voltage regulator according to claim 1, wherein the current determining means is electrically connected to the signal converting means and is used to determine the regulating current based on the digital signal and the input voltage.

2. the current determining means includes a first operational amplifier, a first transistor, a second transistor, a third transistor, a fourth transistor, a plurality of fifth transistors, a plurality of switches, and a first resistor; a positive input terminal of the first operational amplifier is used to receive the input voltage, a negative input terminal of the first operational amplifier is electrically connected to a source of the first transistor and a first terminal of the first resistor, an output terminal of the first operational amplifier is electrically connected to a gate of the first transistor, and a second terminal of the first resistor is grounded; a drain of the first transistor electrically connected to a drain of the second transistor, a gate of the second transistor, and a gate of the third transistor; a source of the second transistor and a source of the third transistor are used to receive a power supply voltage; a drain of the third transistor electrically connected to a drain of the fourth transistor, a gate of the fourth transistor, and gates of a plurality of fifth transistors; a source of the fourth transistor and sources of the fifth transistors are grounded; a drain of each fifth transistor is electrically connected to a first end of a corresponding switch, and a control end of each switch is used to receive the digital signal and turn on or off according to the digital signal; 2. The voltage regulator of claim 1, wherein a second end of each switch is electrically connected to output the regulated current.

3. 3. The voltage regulator according to claim 2, wherein the number of bits of the digital signal is the same as the number of the switches, and each bit of the digital signal is used to control the on state of the corresponding switch.

4. the current detection means includes a sixth transistor, a seventh transistor, a second operational amplifier, a second resistor, and a first capacitor; the voltage output module includes an eighth transistor, a ninth transistor, a tenth transistor, an eleventh transistor, a third operational amplifier, a third resistor, a fourth resistor, and a second capacitor; The gate of the sixth transistor is used to receive the control signal, the drain of the sixth transistor is electrically connected to the voltage input module, and the source of the sixth transistor is electrically connected to the positive input terminal of the second operational amplifier and the drain of the seventh transistor; a negative input terminal of the second operational amplifier is electrically connected to a source of the eighth transistor of the voltage output module, a negative terminal of the third operational amplifier, a first terminal of the third resistor, and a first terminal of the second capacitor; an output terminal of the second operational amplifier is electrically connected to a gate of the seventh transistor, and a source of the seventh transistor is electrically connected to a first terminal of the second resistor and a first terminal of the first capacitor; a second end of the second resistor and a second end of the first capacitor are grounded; 2. The voltage regulator according to claim 1, wherein a first end of the second resistor is used to output the detection voltage.

5. The control module includes an error amplifier, a reference resistor, a reference capacitor, a comparator, an oscillator, a flip-flop, a pulse width modulation (PWM) controller, a current source, a reset switch, a capacitor, and a sampling resistor; a gate of the eighth transistor is electrically connected to the gate of the sixth transistor, the gate of the tenth transistor and the pulse width modulation (PWM) controller of the control module, and is used to receive the control signal; a drain of the eighth transistor is electrically connected to the drain of the ninth transistor, the drain of the sixth transistor, the drain of the tenth transistor and the voltage input module; a source of the eighth transistor is electrically connected to a negative input terminal of the third operational amplifier, a negative input terminal of the second operational amplifier, a first terminal of the third resistor, and a first terminal of the second capacitor; a second terminal of the third resistor is electrically connected to a positive terminal of the error amplifier of the control module and a first terminal of the fourth resistor; a second terminal of the fourth resistor is grounded; and a second terminal of the second capacitor is grounded; A gate of the ninth transistor is electrically connected to the pulse width modulation PWM controller of the control module and is used to receive the control signal, and a source of the ninth transistor is grounded; a positive input terminal of the third operational amplifier is electrically connected to a source of the tenth transistor and a drain of the eleventh transistor, and an output terminal of the third operational amplifier is electrically connected to a gate of the eleventh transistor; a source of the eleventh transistor is electrically connected to second terminals of the switches of the current determining means of the current determining module, a second terminal of the reset switch of the control module, a second terminal of the capacitor of the control module, and a first terminal of the sampling resistor of the control module; 5. The voltage regulator according to claim 4, wherein a first end of the third resistor is used to output the target voltage.

6. the voltage input module includes an input capacitor and an input inductor; a first end of the input capacitor is electrically connected to a first end of the input inductor and is used to receive the input voltage, and a second end of the input capacitor is grounded; 6. The voltage regulator of claim 5, wherein a second end of the input inductor is electrically connected to a drain of the ninth transistor, a drain of the eighth transistor, a drain of the sixth transistor, and a drain of the tenth transistor.

7. A chip comprising a voltage regulator according to any one of claims 1 to 6.

8. A power supply comprising the chip of claim 7.

9. 9. An electronic device comprising the power supply according to claim 8.

10. The electronic device according to claim 9 , wherein the electronic device comprises a display, a smartphone, or a mobile device.

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