Voltage regulators, chips, power supplies and electronic equipment

Abstract

This disclosure relates to voltage adjustment devices, chips, power supplies, and electronic devices. The device includes: a voltage input module for receiving an input voltage; a current determination module electrically connected to the voltage input module for determining an adjustment current based on the input voltage and load current; a control module electrically connected to the current determination module for outputting a control signal based on the adjustment current; and 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 voltage adjustment device proposed in this disclosure can output a stable target voltage, respond quickly to changes in input voltage, and is reliable and stable. It also has high environmental adaptability and can be adapted to different load applications.

Description

Technical Field

[0001] This disclosure relates to the field of integrated circuit technology, and in particular to a voltage regulation device, chip, power supply, and electronic device. Background Technology

[0002] In AMOLED (Active-matrix organic light-emitting diode) power driver management chips, there is a TDMA (Time Division Multiple Access) test requirement: the input power supply is subject to interference at regular intervals, fluctuating upwards or downwards by 500mV within 10μs, and this 500mV fluctuation must last for at least 500μs. If such interference occurs, the output of the DC-DC Boost architecture will inevitably experience either overshoot or undershoot. This disturbance must be less than 20mV under loads up to 200mA and less than 60mV under loads up to 1A.

[0003] However, the relevant technology cannot quickly track changes when there are disturbances in the input power supply, which often leads to disturbances such as overshoot and undershoot in the output voltage, resulting in unstable output voltage. Summary of the Invention

[0004] In view of this, the present disclosure provides a voltage adjustment device, the device comprising:

[0005] Voltage input module, used to receive input voltage;

[0006] A current determination module, electrically connected to the voltage input module, is used to determine the adjustment current based on the input voltage and the load current.

[0007] The control module is electrically connected to the current determination module and is used to output a control signal according to the adjustment current;

[0008] A voltage output module is electrically connected to the voltage input module, the current determination module, and the control module, and is used to output a target voltage based on the control signal and the input voltage.

[0009] In one possible implementation, the current determination module includes a current detection unit, a signal conversion unit, and a current determination unit, wherein...

[0010] The current detection unit is used to determine the load current and obtain the detection voltage based on the load current.

[0011] The signal conversion unit is electrically connected to the current detection unit and is used to convert the detected voltage into a digital signal.

[0012] The current determination unit is electrically connected to the signal conversion unit and is used to determine the adjustment current based on the digital signal and the input voltage.

[0013] In one possible implementation, the current determination unit 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, wherein,

[0014] The positive input terminal of the first operational amplifier is used to receive the input voltage, the negative input terminal of the first operational amplifier is electrically connected to the source of the first transistor and the first end of the first resistor, the output terminal of the first operational amplifier is electrically connected to the gate of the first transistor, and the second end of the first resistor is grounded.

[0015] The drain of the first transistor is electrically connected to the source of the second transistor, the gate of the second transistor, and the gate of the third transistor.

[0016] The drain of the second transistor and the drain of the third transistor are used to receive the power supply voltage.

[0017] The source of the third transistor is electrically connected to the source of the fourth transistor, the gate of the fourth transistor, and the gates of a plurality of fifth transistors.

[0018] The source of the fourth transistor and the sources of the plurality of fifth transistors are grounded.

[0019] The drain of each fifth transistor is electrically connected to the first terminal of the corresponding switch. The control terminal of each switch is used to receive the digital signal and turn it on or off according to the digital signal.

[0020] The second terminal of each switch is electrically connected for outputting the adjustment current.

[0021] In one possible implementation, the number of bits in the digital signal is the same as the number of switches, and each bit of the digital signal is used to control the on / off state of the corresponding switch.

[0022] In one possible implementation, the current detection unit includes a sixth transistor, a seventh transistor, a second operational amplifier, a second resistor, and a first capacitor, wherein...

[0023] 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.

[0024] The negative input terminal of the second operational amplifier is electrically connected to the voltage output module, the output terminal of the second operational amplifier is electrically connected to the gate of the seventh transistor, and the source of the seventh transistor is electrically connected to the first terminal of the second resistor and the first terminal of the first capacitor.

[0025] The second terminal of the second resistor and the second terminal of the first capacitor are grounded.

[0026] The first terminal of the second resistor is used to output the detection voltage.

[0027] In one possible implementation, 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, wherein...

[0028] The 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.

[0029] The 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.

[0030] The source of the eighth transistor is electrically connected to the negative input terminal of the third operational amplifier, the negative input terminal of the second operational amplifier, the first terminal of the third resistor, and the first terminal of the second capacitor. The second terminal of the third resistor is electrically connected to the control module and the first terminal of the fourth resistor. The second terminal of the fourth resistor is grounded, and the second terminal of the second capacitor is grounded.

[0031] The gate of the ninth transistor is electrically connected to the control module for receiving the control signal, and the source of the ninth transistor is grounded.

[0032] The positive input terminal of the third operational amplifier is electrically connected to the source of the tenth transistor and the drain of the eleventh transistor, and the output terminal of the third operational amplifier is electrically connected to the gate of the eleventh transistor.

[0033] The source of the eleventh transistor is electrically connected to both the current determination module and the control module.

[0034] The first terminal of the third resistor is used to output the target voltage.

[0035] In one possible implementation, the voltage input module includes an input capacitor and an input inductor, wherein,

[0036] The first terminal of the input capacitor is electrically connected to the first terminal of the input inductor to receive the input voltage, and the second terminal of the input capacitor is grounded.

[0037] The second terminal of the input inductor is electrically connected to the drain of the ninth transistor, the drain of the eighth transistor, the drain of the sixth transistor, and the drain of the tenth transistor.

[0038] According to one aspect of this disclosure, a chip is provided, the chip comprising:

[0039] The voltage adjustment device mentioned above.

[0040] According to one aspect of this disclosure, a power supply is provided, the power supply comprising:

[0041] The aforementioned chip.

[0042] According to one aspect of this disclosure, an electronic device is provided, the electronic device comprising:

[0043] The aforementioned power supply.

[0044] In one possible implementation, the electronic device includes a display, a smartphone, or a portable device.

[0045] Through the above-described device, the embodiments of this disclosure utilize a current determination module to determine an adjustment current based on the input voltage and load current. Whenever the input voltage changes, the current determination module can respond quickly, generating an adjustment current in conjunction with the load current. This adjustment current is then output to the control module to generate a control signal. Based on the control signal, the voltage output module can output a stable target voltage without excessive overshoot or undershoot, and can achieve stable voltage output under different load conditions. The voltage adjustment device proposed in this disclosure can output a stable target voltage, respond quickly to changes in input voltage, and is reliable and stable, with high environmental adaptability, suitable for various load applications.

[0046] Other features and aspects of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0047] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of this disclosure together with the specification and serve to explain the principles of this disclosure.

[0048] Figure 1A schematic diagram of a voltage adjustment device according to an embodiment of the present disclosure is shown.

[0049] Figure 2 A schematic diagram of a voltage adjustment device according to an embodiment of the present disclosure is shown.

[0050] Figure 3 A schematic diagram of a current determination unit according to an embodiment of the present disclosure is shown.

[0051] Figure 4 A schematic diagram of voltage variation in the DC-DC architecture of the relevant technology is shown.

[0052] Figure 5 A schematic diagram of voltage change in a voltage adjustment device according to an embodiment of the present disclosure is shown.

[0053] Figure 6 A schematic diagram of voltage changes in a voltage regulation device without load current control is shown.

[0054] Figure 7 A schematic diagram of voltage changes in a voltage regulation device that incorporates load current control is shown. Detailed Implementation

[0055] Various exemplary embodiments, features, and aspects of this disclosure will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0056] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0057] Furthermore, to better illustrate this disclosure, numerous specific details are set forth in the following detailed description. Those skilled in the art will understand that this disclosure can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art have not been described in detail in order to highlight the main points of this disclosure.

[0058] Please see Figure 1 , Figure 1 A schematic diagram of a voltage adjustment device according to an embodiment of the present disclosure is shown.

[0059] like Figure 1 As shown, the device includes:

[0060] Voltage input module 10 is used to receive input voltage;

[0061] The current determination module 20 is electrically connected to the voltage input module 10 and is used to determine the adjustment current based on the input voltage and the load current.

[0062] Control module 30 is electrically connected to current determination module 20 and is used to output control signal according to the adjustment current;

[0063] The voltage output module 40 is electrically connected to the voltage input module 10, the current determination module 20 and the control module 30, and is used to output a target voltage according to the control signal and the input voltage.

[0064] Through the above-described device, the embodiments of this disclosure utilize a current determination module to determine an adjustment current based on the input voltage and load current. Whenever the input voltage changes, the current determination module can respond quickly, generating an adjustment current in conjunction with the load current. This adjustment current is then output to the control module to generate a control signal. Based on the control signal, the voltage output module can output a stable target voltage without excessive overshoot or undershoot, and can achieve stable voltage output under different load conditions. The voltage adjustment device proposed in this disclosure can output a stable target voltage, respond quickly to changes in input voltage, and is reliable and stable, with high environmental adaptability, suitable for various load applications.

[0065] The voltage adjustment device disclosed herein may include a DC-DC conversion circuit, which can output a stable and reliable target voltage based on the input DC voltage.

[0066] Please see Figure 2 , Figure 2 A schematic diagram of a voltage adjustment device according to an embodiment of the present disclosure is shown.

[0067] In one possible implementation, such as Figure 2 As shown, the current determination module 20 may include a current detection unit 220, a signal conversion unit 230, and a current determination unit 210, wherein,

[0068] The current detection unit 220 is used to determine the load current and obtain the detection voltage based on the load current.

[0069] The signal conversion unit 230 is electrically connected to the current detection unit 220 and is used to convert the detected voltage into a digital signal.

[0070] The current determination unit 210 is electrically connected to the signal conversion unit 230 and is used to determine the adjustment current Isink based on the digital signal and the input voltage.

[0071] Please refer to the following: Figure 3 , Figure 3 A schematic diagram of a current determination unit according to an embodiment of the present disclosure is shown.

[0072] In one possible implementation, such as Figure 3 As shown, the current determination unit may include a first operational amplifier OP1, a first transistor Q1, a second transistor Q2, a third transistor Q3, a fourth transistor Q4, multiple fifth transistors Q5, multiple switches S1, and a first resistor R1, wherein,

[0073] The positive input terminal of the first operational amplifier OP1 is used to receive the input voltage Vin. The negative input terminal of the first operational amplifier OP1 is electrically connected to the source of the first transistor Q1 and the first end of the first resistor. The output terminal of the first operational amplifier OP1 is electrically connected to the gate of the first transistor Q1. The second end of the first resistor R1 is grounded.

[0074] The drain of the first transistor Q1 is electrically connected to the source of the second transistor Q2, the gate of the second transistor Q2, and the gate of the third transistor Q3.

[0075] The drain of the second transistor Q2 and the drain of the third transistor Q3 are used to receive the power supply voltage Vdd.

[0076] The source of the third transistor Q3 is electrically connected to the source of the fourth transistor Q4, the gate of the fourth transistor Q4, and the gates of the plurality of fifth transistors Q5.

[0077] The source of the fourth transistor Q4 and the source of the fifth transistor Q5 are grounded.

[0078] The drain of each fifth transistor Q5 is electrically connected to the first terminal of the corresponding switch S1. The control terminal of each switch S1 is used to receive the digital signal and turn it on or off according to the digital signal.

[0079] The second terminal of each switch S1 is electrically connected for outputting the adjustment current Isink.

[0080] Through the above-described device, the embodiments of this disclosure use a current determination unit to respond to changes in input voltage and combine it with a digital signal obtained from the load current to determine an adjustment current Isink to compensate for changes in input voltage and generate a control signal. This can stabilize the output voltage, reduce output voltage fluctuations when the input voltage changes, and improve the device's environmental adaptability.

[0081] It should be noted that the number of fifth transistors and the number of switches in this disclosure are not limited. Those skilled in the art can set them as needed. In one example, the number of fifth transistors and the number of switches can be the same, and the connection between the drain of each fifth transistor and the control module is controlled by the corresponding switch. The type and specific implementation of the switches in this disclosure are not limited. In one example, switch S1 can be a transistor, a single-pole single-throw switch, etc.

[0082] With the above-described device, the embodiments of this disclosure can quickly respond to changes in input voltage when the input voltage changes, and determine the adjustment current in conjunction with the load current to compensate the input of the control module, thereby reducing output voltage fluctuations and adapting to different load environments, thus improving environmental adaptability.

[0083] Please continue reading. Figure 2 In one possible implementation, such as Figure 2 As shown, the current detection unit 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, wherein...

[0084] The gate of the sixth transistor Q6 is used to receive 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.

[0085] The negative input terminal of the second operational amplifier OP2 is electrically connected to the voltage output module, and the output terminal of the second operational amplifier OP2 is electrically connected to the gate of the seventh transistor Q7. 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.

[0086] The second terminal of the second resistor R2 and the second terminal of the first capacitor C1 are grounded.

[0087] The first terminal of the second resistor R2 is used to output the detection voltage Vctrl.

[0088] With the above device, the embodiments of this disclosure can detect the load current through the current detection unit, determine the detection voltage based on the detected load current, and determine the second adjustment current based on the detection voltage. This can compensate for changes at the load end, thereby enabling control of the control signal based on different load conditions.

[0089] In one example, during detection, the current detection unit can average the current of the eighth transistor at (1-D)T*IL to obtain the detection voltage Vtrcl=(1-D)T*IL*R, where D represents the duty cycle, T represents the clock period, IL represents the inductance of the input inductor L, and R represents the resistance of the second resistor R2.

[0090] The current detection unit can convert the load current value into a detection voltage Vctrl = α * Id, where α represents a preset parameter and Id represents the load current.

[0091] Through the above-described device, the embodiments of this disclosure can achieve a rapid response to the input voltage and provide compensation for different loads. Therefore, the device can adapt to a variety of loads and increases environmental adaptability.

[0092] In one possible implementation, the signal conversion unit 230 can be implemented by dedicated hardware circuitry or by existing hardware circuitry.

[0093] In one example, the signal conversion unit can be implemented by digital circuits. For example, the signal conversion unit 230 can be configured as a state machine including registers and logic circuits, or it can be implemented by a digital-to-analog converter. The specific implementation of the signal conversion unit 230 is not limited in the embodiments disclosed herein.

[0094] In one possible implementation, the number of bits in the digital signal is the same as the number of switches, and each bit of the digital signal is used to control the on / off state of the corresponding switch. The digital signal obtained through the load current can be used as a control signal for multiple switches, and the output of the signal conversion unit 230 can be electrically connected to the control terminal of each switch, thereby realizing the control of each switch according to the digital signal.

[0095] In one example, when the signal conversion unit 230 receives the detection voltage Vctrl output by the current detection unit 220, it can perform signal conversion on the detection voltage Vctrl to convert it into Dctrl. <x:0>Where X represents the highest bit of the digital signal, and X+1 can be equal to the number of switches in the current determination unit.

[0096] In one example, different digital signals can be determined for different load currents, so the conduction status of the switches in the current determination unit is different. The current determination unit can output an adjustment current of a corresponding magnitude according to the load current. For example, when the load current increases, the more switches controlled by the digital signals, the larger the adjustment current output by the current determination unit will be. This can compensate or adjust the input of the control module so that the voltage output by the control module remains stable.

[0097] In one example, the conversion parameters (e.g., the number of bits of the digital signal) of the signal conversion unit 230 can be configured according to the number of switches. When the circuit is working, the signal conversion unit 230 can obtain a digital signal according to the configured conversion parameters and the input detection voltage Vctrl to control the conduction state of each switch.

[0098] In one example, the signal conversion unit 230 can also be configured to automatically read the parameter information (e.g., the number of switches) of the current determination unit and 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, the digital signal can be obtained according to the conversion parameters and the input detection voltage Vctrl to control the conduction state of each switch.

[0099] With the above device, the signal conversion unit of this embodiment can determine the magnitude of the adjustment current based on the detection voltage output by the current detection unit, so that the device can respond quickly to changes in input voltage and adapt to various load conditions. Under different load conditions, it can reduce the fluctuation of output voltage when the input voltage changes, so that the output voltage remains stable.

[0100] In one possible implementation, such as Figure 2 As shown, 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, wherein...

[0101] 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.

[0102] 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.

[0103] 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.

[0104] The gate of the ninth transistor Q9 is electrically connected to the control module for receiving the control signal, and the source of the ninth transistor Q9 is grounded.

[0105] The positive input terminal of the third operational amplifier OP3 is electrically connected to the source of the tenth transistor Q10 and the drain of the eleventh transistor Q11, and the output terminal of the third operational amplifier OP3 is electrically connected to the gate of the eleventh transistor Q11.

[0106] The source of the eleventh transistor Q11 is electrically connected to both the current determination module and the control module.

[0107] The first terminal of the third resistor R3 is used to output the target voltage.

[0108] With the above device, the voltage output module of this embodiment can realize voltage output according to the control signal and the input voltage passed from the input module, so as to output a stable target voltage.

[0109] In one possible implementation, the target voltage can be obtained according to the following formula:

[0110] Vout = Vin / (1-D), where D can represent the duty cycle of the control signal.

[0111] Therefore, by adjusting the duty cycle of the control signal, this disclosure can quickly respond to changes in the input voltage and output the desired target output voltage.

[0112] The following describes possible implementations of the voltage input module 10. It should be understood that the following description is exemplary and should not be regarded as a limitation of this disclosure.

[0113] In one possible implementation, such as Figure 2 As shown, the voltage input module 10 may include an input capacitor Cin and an input inductor L, wherein,

[0114] The first terminal of the input capacitor Cin is electrically connected to the first terminal of the input inductor L to receive the input voltage, and the second terminal of the input capacitor Cin is grounded.

[0115] The second terminal 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.

[0116] It should be noted that although this disclosure uses an input capacitor as an example, it should be understood that this disclosure is not limited thereto. In other embodiments, the input capacitor can be replaced by an input capacitor network composed of multiple capacitors. The input capacitor network may include multiple capacitors, and this disclosure does not limit their connection relationship and number.

[0117] In one possible implementation, the input inductor L can be set or replaced by multiple inductors, and the multiple inductors can be connected in series, in parallel or in combination thereof. This disclosure does not limit the number of inductors or their connection relationship included in the input inductor L.

[0118] The following describes possible implementations of the control module 30. It should be understood that the following description is exemplary and should not be regarded as a limitation of this disclosure.

[0119] In one possible implementation, such as Figure 2 As shown, the control module 30 may include an error amplifier gm, a reference resistor Rea, a reference capacitor Cea, a comparator CMP, an oscillator, a trigger, a pulse width modulation (PWM) controller, a current source Iramp, a reset switch Vreset, a capacitor Cramp, and a sampling resistor Rramp, wherein:

[0120] The positive terminal 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 terminal is used to input the reference voltage Vref. The output terminal is electrically connected to the first terminal of the reference resistor Rea and the negative terminal of the comparator CMP.

[0121] The second terminal of the reference resistor Rea is electrically connected to the first terminal of the reference capacitor Cea, and the second terminal of the reference capacitor Cea is grounded.

[0122] The positive terminal of the comparator CMP is electrically connected to the current source Iramp, the first terminal of the capacitor Cramp, and the first terminal of the reset switch, and is used to input the comparison voltage Vramp. The output terminal of the comparator CMP is electrically connected to the first terminal R of the flip-flop.

[0123] The output of the current determination module is electrically connected to the second terminal of the reset switch, the second terminal of the capacitor Crap, and the first terminal of the sampling resistor Rramp, and outputs the adjustment current Isink. The second terminal of the sampling resistor Rramp is grounded.

[0124] 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. The output terminal Q of the flip-flop is electrically connected to the input terminal of the PWM controller.

[0125] The first output terminal of the PWM controller is electrically connected to the gate of the ninth transistor, and the second output terminal is electrically connected to the gates of the eighth transistor, the tenth transistor, and the sixth transistor.

[0126] In one possible implementation, the trigger can be configured as follows:

[0127] When the input at the first terminal R is high (1), the output at the output terminal Q is 1;

[0128] When the second input S is high, the output Q is 0.

[0129] In one possible implementation, the PWM controller can be configured to:

[0130] When the input is 1, the output is 1;

[0131] When the input is 0, the output is 0.

[0132] With the above-described device, the control module of this embodiment can adjust the control signal according to the adjustment current, thereby reducing the voltage fluctuation of the voltage output module and maintaining the stability of the output voltage.

[0133] In this embodiment of the disclosure, the voltage determination module may include a current determination unit and / or a second determination unit.

[0134] In one example, the current determination unit can also be configured to include only a current determination unit. For the voltage determination module, a current determination unit is included. In one possible implementation, when the input voltage increases, for example, when Vin changes by a variable ΔVin, when Vin is input to the current determination unit, the change in the adjustment current Isink can be determined by the current determination unit as ΔIsink = gm1 * ΔVin, where gm1 represents the adjustment parameter according to a predetermined value, Vin represents the input voltage, and "*" represents a multiplication operation. In this way, the initial level of Vramp changes by a component of gm1 * ΔVin * Rramp. This change is used to ensure that the output of Vea remains as unchanged as possible. With Vref remaining unchanged, this means that the change in Vfb is small, that is, 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.

[0135] In this way, when the adjustment current is input to the control module, the control module can use the adjustment current to compensate for the change in input voltage and generate a control signal to adaptively adjust the magnitude of the output voltage, thereby making the fluctuation of the output voltage small.

[0136] It should be noted that the specific size of gm1 is not limited in the embodiments disclosed herein, and those skilled in the art can determine it through simulation as needed.

[0137] Please see Figure 4 , Figure 4 A schematic diagram of voltage variation in the DC-DC architecture of the relevant technology is shown.

[0138] Please see Figure 5 , Figure 5 A schematic diagram of voltage change in a voltage adjustment device according to an embodiment of the present disclosure is shown.

[0139] like Figure 4 As shown in the related technology, when the input voltage Vin changes, the change in the voltage output Vout acts on the error amplifier gm and affects Vea. When Vea changes more, the new duty cycle D is adjusted more slowly through the loop. Therefore, the output voltage that jumps up or down with the input voltage will be very large. In this case, the peak-to-peak value of the output voltage Vout can reach 130mV.

[0140] like Figure 5 As shown, when the current determination module includes a current determination unit, the current determination unit in this embodiment determines the total current to control the control module, which can significantly reduce the fluctuation of the output voltage, and the peak-to-peak value of the output voltage is only 30mV.

[0141] As can be seen, this scheme can respond well to changes in input voltage, and the peak-to-peak value of the output voltage change, Vpp, has been reduced from 130mV to 30mV.

[0142] To adapt to load changes, the current determination module in this embodiment may further include a current detection unit and a signal conversion unit. When the current detection unit detects the load current and converts it into a detection voltage, the signal conversion unit converts the detection voltage into a digital signal and inputs the digital signal to the current determination unit. The current determination unit can determine the adjustment current based on the digital signal and the input voltage and apply it to the control module, so that the control module can respond quickly to changes in the input voltage and adapt to different load conditions.

[0143] Please see Figure 6 , Figure 6 A schematic diagram of voltage changes in a voltage regulation device without load current control is shown.

[0144] Please see Figure 7 , Figure 7 A schematic diagram of voltage changes in a voltage regulation device that incorporates load current control is shown.

[0145] like Figure 6 As shown, since the current determination unit needs to determine gm1 in advance based on the set load size, the balance point is selected between light and heavy loads. For loads that are too light or too heavy, the compensation is often insufficient or overflows. Therefore, when Figure 6 Without using a second determining unit to detect the load current, the voltage regulation device cannot adapt to changes in the load. When the load changes (load current Id), the peak-to-peak value of the output voltage change ΔVout fluctuates significantly (Vpp fluctuates from 20mV to 50mV).

[0146] like Figure 7 As shown, the load current is detected by a current detection unit, and a digital signal is determined by a signal conversion unit. The current determination unit determines the adjustment current to compensate the input of the control module based on the digital signal and the input voltage. The voltage adjustment device can not only achieve a fast response to changes in input voltage, but also provide compensation for different loads. Under different loads, the peak-to-peak value of the output voltage Vout fluctuation range Vpp is below 25mV, thereby improving the environmental adaptability of the device. This ensures that the performance of the power supply's fastline excitation in TDMA testing meets the requirements of SPEC and satisfies the TDMA testing requirements of AMOLED in various application environments.

[0147] It should be understood that this disclosure does not limit the selection of each component of the control module 30 or the selection of the reference voltage, which can be determined by those skilled in the art as needed.

[0148] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A voltage regulating device, characterized in that, The device includes: Voltage input module, used to receive input voltage; A current determination module, electrically connected to the voltage input module, is used to determine the adjustment current based on the input voltage and the load current. The control module is electrically connected to the current determination module and is used to output a control signal according to the adjustment current; A voltage output module, electrically connected to the voltage input module, the current determination module, and the control module, is used to output a target voltage based on the control signal and the input voltage. The current determination module includes a current detection unit, a signal conversion unit, and a current determination unit, wherein... The current detection unit is used to determine the load current and obtain the detection voltage based on the load current. The signal conversion unit is electrically connected to the current detection unit and is used to convert the detected voltage into a digital signal. The current determination unit, electrically connected to the signal conversion unit, is used to determine the adjustment current based on the digital signal and the input voltage. The current determination unit includes a first operational amplifier, a first transistor, a second transistor, a third transistor, a fourth transistor, multiple fifth transistors, multiple switches, and a first resistor, wherein... The positive input terminal of the first operational amplifier is used to receive the input voltage, the negative input terminal of the first operational amplifier is electrically connected to the source of the first transistor and the first end of the first resistor, the output terminal of the first operational amplifier is electrically connected to the gate of the first transistor, and the second end of the first resistor is grounded. The drain of the first transistor is electrically connected to the source of the second transistor, the gate of the second transistor, and the gate of the third transistor. The drain of the second transistor and the drain of the third transistor are used to receive the power supply voltage. The source of the third transistor is electrically connected to the source of the fourth transistor, the gate of the fourth transistor, and the gates of a plurality of fifth transistors. The source of the fourth transistor and the sources of the plurality of fifth transistors are grounded. The drain of each fifth transistor is electrically connected to the first terminal of the corresponding switch. The control terminal of each switch is used to receive the digital signal and turn it on or off according to the digital signal. The second terminal of each switch is electrically connected for outputting the adjustment current. The voltage adjustment device includes a DC-DC conversion circuit.

2. The apparatus according to claim 1, characterized in that, The number of bits in the digital signal is the same as the number of switches, and each bit of the digital signal is used to control the conduction state of the corresponding switch.

3. The apparatus according to claim 1, characterized in that, The current detection unit includes a sixth transistor, a seventh transistor, a second operational amplifier, a second resistor, and a first capacitor, wherein... 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. The negative input terminal of the second operational amplifier is electrically connected to the voltage output module, the output terminal of the second operational amplifier is electrically connected to the gate of the seventh transistor, and the source of the seventh transistor is electrically connected to the first terminal of the second resistor and the first terminal of the first capacitor. The second terminal of the second resistor and the second terminal of the first capacitor are grounded. The first terminal of the second resistor is used to output the detection voltage.

4. The apparatus according to claim 3, characterized in that, 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, wherein... The 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. The 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. The source of the eighth transistor is electrically connected to the negative input terminal of the third operational amplifier, the negative input terminal of the second operational amplifier, the first terminal of the third resistor, and the first terminal of the second capacitor. The second terminal of the third resistor is electrically connected to the control module and the first terminal of the fourth resistor. The second terminal of the fourth resistor is grounded, and the second terminal of the second capacitor is grounded. The gate of the ninth transistor is electrically connected to the control module for receiving the control signal, and the source of the ninth transistor is grounded. The positive input terminal of the third operational amplifier is electrically connected to the source of the tenth transistor and the drain of the eleventh transistor, and the output terminal of the third operational amplifier is electrically connected to the gate of the eleventh transistor. The source of the eleventh transistor is electrically connected to both the current determination module and the control module. The first terminal of the third resistor is used to output the target voltage.

5. The apparatus according to claim 4, characterized in that, The voltage input module includes an input capacitor and an input inductor, wherein, The first terminal of the input capacitor is electrically connected to the first terminal of the input inductor to receive the input voltage, and the second terminal of the input capacitor is grounded. The second terminal of the input inductor is electrically connected to the drain of the ninth transistor, the drain of the eighth transistor, the drain of the sixth transistor, and the drain of the tenth transistor.

6. A chip, characterized in that, The chip includes: The voltage adjustment device as described in any one of claims 1-5.

7. A power supply, characterized in that, The power source includes: The chip as described in claim 6.

8. An electronic device, characterized in that, The electronic device includes: The power supply as described in claim 7.

9. The electronic device according to claim 8, characterized in that, The electronic device includes a display, a smartphone, or a portable device.

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