CN117873252A - Voltage adjusting circuit, chip and electronic equipment - Google Patents
Voltage adjusting circuit, chip and electronic equipment Download PDFInfo
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- CN117873252A CN117873252A CN202311837528.XA CN202311837528A CN117873252A CN 117873252 A CN117873252 A CN 117873252A CN 202311837528 A CN202311837528 A CN 202311837528A CN 117873252 A CN117873252 A CN 117873252A
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- 238000005070 sampling Methods 0.000 claims description 28
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- 230000001105 regulatory effect Effects 0.000 description 7
- 229920001621 AMOLED Polymers 0.000 description 3
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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Abstract
The invention discloses a voltage adjusting circuit, a chip and electronic equipment, wherein the circuit comprises: a voltage input module; the control module is connected with the voltage input module and generates a control signal according to the input voltage; the voltage output module is connected with the voltage input module and the control module and outputs target voltage according to the input voltage and the control signal; the compensation module is connected with the control module and comprises a correction unit, wherein the correction unit increases a correction amount according to the variation of the input voltage so that the compensation module can compensate according to the variation of the input voltage, and the correction amount is a variable related to the current direct current average value of the input voltage. According to the voltage adjusting circuit, the chip and the electronic equipment, the compensation module is adopted, so that the input voltage or the load current in the circuit is changed, the compensation current is responded quickly, the circuit can output stable target voltage, and excessive overshoot and undershoot phenomena can not occur.
Description
Technical Field
The present invention relates to the field of integrated circuits, and in particular, to a voltage adjusting circuit, a chip and an electronic device.
Background
In the power driving management chip of the AMOLED (Active-matrix organic light-emitting diode), there is such a TDMA (Time division multiple access, time division multiplexing) test requirement: the input power is disturbed at intervals to bounce 500mV up or down within 10 μs and the 500mV bounce lasts at least 500 μs as shown in FIG. 2. If such disturbances occur, then there must be either overschoot or underschoot for the output of the Boost architecture of the DC-DC, requiring less than 20mV for loads within 200mA and less than 60mV for loads within 1A.
In the voltage adjusting circuit 100 shown in fig. 1, the first transistor Q1 is a PMOS thyristor, the second transistor Q2 is an NMOS switch, and the first transistor Q1 and the second transistor Q2 are turned on in turn to ensure that the current of the inductor L is continuous. Due to the action of the operational amplifier OP and the fourth transistor Q4, the voltages at the four ends of the first transistor Q1 and the mirrored third transistor Q3 are completely consistent, and the ratio of current sampling satisfies the ratio of m=W Q1 /W Q2 Sampling current isense=i L The current flowing into the sampling resistor Rramp meets the requirement of the system on the sampling current.
Further, the feedback voltage signal vfb=vout [ R2/(r1+r2) ], the comparator COMP adjusts the duty ratio of the PWM signal of the whole system by comparing the relationship between the output voltage Vea of the error amplifier gm and the ramp compensation voltage Vramp, and the signal frequency of the PWM is determined by the clock signal CLK output from the oscillator. The reference resistor Rea and the reference capacitor Cea are used to compensate the stability of the entire boost loop under different current load conditions.
However, if the input voltage Vin changes suddenly, the output current does not suddenly change, the output voltage Vout needs to be amplified to the output voltage Vea by the error amplifier gm after the output voltage Vout changes and when the feedback voltage signal Vfb is reflected, and then the comparator COMP compares the output voltage Vout to adjust the change amount of the output voltage Vout again by adjusting the duty ratio of the PWM, and the whole process can be simply described as vin→vout→vfb→vea→cmp_out→pwm→vout.
However, the voltage adjusting circuit 100 shown in fig. 1 is not capable of rapidly responding to a change in the input voltage Vin, especially in the case of an input voltage whose average value is not the same, for example, an input voltage of 2.9V to an input voltage of 3.4V, and is not capable of timely adjusting the change in the output voltage Vout.
Therefore, in the related art, when the average value of the input power supply changes, the change cannot be quickly tracked, which often causes disturbance such as overshoot and undershoot to the output voltage, and the output voltage is unstable.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a voltage adjusting circuit, a chip and an electronic device, which can quickly respond to a change in an input voltage or a load current in the circuit and provide a compensation current by using a compensation module, so that the circuit can output a stable target voltage without excessive overshoot and undershoot.
According to an aspect of the present invention, there is provided a voltage adjusting circuit including: the voltage input module is used for receiving input voltage; the control module is connected with the voltage input module and is used for generating a control signal according to the input voltage; the voltage output module is connected with the voltage input module and the control module and is used for outputting target voltage according to the input voltage and the control signal; the compensation module is connected with the control module and is used for generating compensation current according to the variation of the input voltage, wherein the compensation module comprises a correction unit, the correction unit is used for increasing a correction amount according to the variation of the input voltage so that the compensation module can compensate according to the variation of the input voltage, the correction amount is a variable related to the current direct current average value of the input voltage, and the control module is used for adjusting the control signal according to the compensation current so that the voltage output module can output stable target voltage.
Optionally, the correction unit includes: the first end of the filter receives the input voltage, and the second end of the filter outputs the average value of the input voltage; the first end of the subtracter is connected with the second end of the filter, and the second end outputs a difference value between a constant and the average value of the input voltage; the adder comprises three ends, the first end is connected with the second end of the subtracter, the second end receives the input voltage, and the third end outputs the sum of the difference value output by the subtracter and the input voltage.
Optionally, the compensation current is a sum of the first compensation current and the second compensation current.
Optionally, the voltage output module includes: and the second end of the load current detection unit is connected with the output end of the target voltage, the third end of the load current detection unit is connected with the compensation module, and the load current detection unit is used for determining load current and obtaining load voltage according to the load current.
Optionally, the compensation module further comprises: the first compensation unit comprises a normal phase input end, an inversion input end and an output end, wherein the normal phase input end of the first compensation unit is connected with the output end of the correction unit, the inversion input end of the first compensation unit is connected with the grounding end, and the output end of the first compensation unit outputs the first compensation current, and the first compensation unit amplifies an output signal of the correction unit to generate the first compensation current.
Optionally, the compensation module further comprises: the multiplication unit is connected with the load current detection unit and is used for obtaining an intermediate voltage according to the input voltage and the load voltage; the second compensation unit comprises a normal phase input end, an opposite phase input end and an output end, wherein the normal phase input end of the second compensation unit is connected with the multiplication unit, the opposite phase input end is grounded, the output end of the second compensation unit is connected with the output end of the first compensation unit, and the second compensation unit generates the second compensation current according to the intermediate voltage.
Optionally, the voltage input module includes: the first end of the input capacitor is connected with the direct-current voltage input end, and the second end of the input capacitor is connected with the grounding end; and the first end of the inductor is connected with the first end of the input capacitor, and the second end of the inductor is connected with the voltage output module.
Optionally, the control module includes: the error amplifier comprises a normal phase input end, a reverse input end and an output end, wherein the normal phase input end is connected with the voltage output module and is used for receiving a feedback voltage signal, and the reverse input end is connected with the reference voltage input end; the first end of the reference resistor is connected with the output end of the error amplifier; the first end of the reference capacitor is connected with the second end of the reference resistor, and the second end of the reference capacitor is connected with the grounding end; the first end of the current source is connected with the first end of the inductor in the voltage input module; the first end of the sampling capacitor is connected with the second end of the current source; the first end of the sampling resistor is connected with the second end of the sampling capacitor, and the second end of the sampling resistor is connected with the grounding end; the first end of the reset switch is connected with the first end of the sampling capacitor, and the second end of the reset switch is connected with the second end of the sampling capacitor; the comparator comprises a normal phase input end, an inversion input end and an output end, wherein the normal phase input end is connected with the second end of the current source, and the inversion input end is connected with the output end of the error amplifier; the trigger comprises a first input end, a second input end and an output end, wherein the first input end of the trigger is connected with the output end of the comparator; the output end of the oscillator is connected with the second input end of the trigger; the PWM control unit comprises an input end, a first output end and a second output end, wherein the input end of the PWM control unit is connected with the output end of the trigger, and the first output end and the second output end are both connected with the voltage output module.
Optionally, the voltage output module includes: the first channel end of the first transistor is connected with the second end of the inductor of the voltage input module, the second channel end of the first transistor is connected with the load current detection unit, and the control end of the first transistor is connected with the second output end of the control module; the first channel end of the second transistor is connected with the first channel end of the first transistor, the second channel end is connected with the grounding end, and the control end is connected with the first output end of the control module; a third transistor, wherein a first path end of the third transistor is connected with a first path end of the first transistor, and a control end of the third transistor is connected with a control end of the first transistor; a fourth transistor, a first path end of which is connected with a second path end of the third transistor, and a second path end of which is connected with an output end of the compensation module; the operational amplifier comprises a normal phase input end, an inversion input end and an output end, wherein the normal phase input end is connected with the second path end of the third transistor, the inversion input end is connected with the second path end of the first transistor, and the output end is connected with the control end of the fourth transistor; the first end of the first resistor is connected with the second end of the load current detection unit, and the second end of the first resistor is connected with the control module; the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is connected with the grounding end; and the first end of the output end capacitor is connected with the first end of the first resistor, and the second end of the output end capacitor is connected with the grounding end, wherein the second end of the first resistor outputs a feedback voltage signal.
According to another aspect of the present invention, there is provided a chip including the voltage adjustment circuit described above.
According to another aspect of the present invention, there is provided an electronic device including the chip described above.
In the voltage adjusting circuit, the chip and the electronic equipment provided by the application, the normal phase input end of the first compensating unit is connected with the direct current voltage input end through the correcting unit, so that the compensating module can quickly respond as long as the input voltage changes or the average value of the input voltage changes, the compensating current is input into the control module to generate a control signal, and the voltage output module can output stable target voltage according to the control signal without excessive overshoot and undershoot.
Further, the voltage adjusting circuit, the chip and the electronic device further comprise a load current detecting unit in the voltage output module, the load current detecting unit is located between the first transistor and the direct-current voltage output end and can be used for detecting load current and converting the load current into load voltage to be fed back to the compensating module, and the multiplying unit and the second compensating unit in the compensating module are used for receiving the load voltage.
According to the voltage regulating circuit, stable target voltage can be output, the change of input voltage can be responded quickly, and the voltage regulating circuit has the characteristics of reliability and stability.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 shows a schematic diagram of a voltage regulation circuit according to the prior art;
FIG. 2 shows a schematic diagram of a test voltage variation of a voltage regulation circuit according to the prior art;
fig. 3 shows a schematic diagram of a voltage regulation circuit according to an embodiment of the invention;
fig. 4 is a schematic diagram showing the configuration of a correction unit in the voltage adjusting circuit according to the embodiment of the invention;
fig. 5a and 5b show voltage change diagrams of the voltage regulating circuit according to an embodiment of the invention.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts. For clarity, the various features of the drawings are not drawn to scale.
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples.
Fig. 3 shows a schematic diagram of a voltage regulation circuit according to an embodiment of the invention; fig. 4 is a schematic diagram showing the configuration of a correction unit in the voltage adjusting circuit according to the embodiment of the invention; fig. 5a and 5b show voltage change diagrams of the voltage regulating circuit according to an embodiment of the invention.
Referring to fig. 3, the voltage adjusting circuit 200 of the embodiment of the present application includes: a dc voltage input Vin, a dc voltage output Vout, a voltage input module 110, a control module 120, a voltage output module 230, and a compensation module 240. The voltage input module 110 is connected to the control module 120 and the voltage output module 130, and the control module 120 is connected to the compensation module 240 and the voltage output module 230. The voltage output by the dc voltage output terminal Vout is the target voltage.
Specifically, the voltage input module 110 includes an input capacitor C IN And inductance L, input capacitance C IN The inductor L is connected between the dc voltage input terminal Vin and the ground terminal GND, and has a first end connected to the dc voltage input terminal Vin and a second end connected to the voltage output module 230.
The control module 120 includes: error amplifier (gm), reference resistor Rea, reference capacitor Cea, comparator COMP, oscillator (Oscillator), flip-flop, PWM control unit (PWM Control Driver), current source Iramp, reset switch Vreset, sampling capacitor Cramp, sampling resistor Rramp. The error amplifier gm includes a non-inverting input terminal, an inverting input terminal, and an output terminal, where the non-inverting input terminal is connected to the voltage output module 230 and is configured to receive the feedback voltage signal Vfb of the voltage output module 230, and the inverting input terminal is connected to the reference voltage Vref input terminal; the first end of the reference resistor Rea is connected with the output end of the error amplifier gm; the first end of the reference capacitor Cea is connected with the second end of the reference resistor Rea, and the second end is connected with the ground end GND; a first terminal of the current source Iramp is connected to a first terminal of the inductor L in the voltage input module 110; the first end of the sampling capacitor Cramp is connected with the second end of the current source Iramp, and the second end of the sampling capacitor Cramp is connected with the voltage output module 230 and is used for receiving the sampling current Isense of the voltage output module 230; the first end of the sampling resistor Rramp is connected with the second end of the sampling capacitor Cramp, the voltage at the midpoint of the connection is, for example, the sampling voltage Vsense, and the second end is connected with the ground end GND; the first end of the reset switch Vreset is connected with the first end of the sampling capacitor Cramp, the second end of the reset switch Vreset is connected with the second end of the sampling capacitor Cramp, and the reset switch Vreset is turned on and off according to a reset voltage; the comparator COMP comprises a normal phase input end, an opposite phase input end and an output end, wherein the normal phase input end is connected with the second end of the current source Iramp and is used for inputting a ramp compensation voltage Vramp, and the opposite phase input end is connected with the output end of the error amplifier gm; the trigger comprises a first input end R, a second input end S and an output end Q, wherein the first input end R is connected with the output end of the comparator COMP; an Oscillator (Oscillator) for generating the clock signal CLK, and an output of the Oscillator is connected to the second input S of the flip-flop; the PWM control unit includes an input terminal, a first output terminal, and a second output terminal, the input terminal of which is connected to the output terminal of the trigger, and the first output terminal and the second output terminal are both connected to the voltage output module 230.
In this embodiment, the trigger may be configured, for example, to: when the first input end R inputs a high level (1), the output end Q outputs the high level (1); when the second input terminal S inputs a high level (1), the output terminal Q outputs a low level (0). In this embodiment, the PWM control unit may be configured to, for example: when the input end is input into the high level (1), the output is the high level (1); when the input terminal inputs a low level (0), the output is a low level (0).
The voltage output module 230 may include a first transistor Q1, a second transistor Q2, a third transistor Q3, a fourth transistor Q4, an operational amplifier OP, a first resistor R1, a second resistor R2, and an output capacitor C OUT And a load current detection unit. The first channel end of the first transistor Q1 is connected to the second end of the inductor L in the voltage input module 110, and the control end is connected to the second output end of the PWM control unit in the control module 120; the first path end of the second transistor Q2 is connected with the first path end of the first transistor Q1, the second path end is connected with the grounding end GND, and the control end is connected with the first output end of the PWM control unit in the control module 120; the first channel end of the third transistor Q3 is connected with the first channel end of the first transistor Q1, and the control end is connected with the control end of the first transistor Q1; the first pass terminal of the fourth transistor Q4 is connected to the second pass terminal of the third transistor Q3, and the second pass terminal is connected to the control module 120 for providing the sampling current Isense; the load current detection unit comprises three terminals, a first terminal connected to the second path terminal of the first transistor Q1, a second terminal connected to the DC voltage output terminal Vout, and a third terminal connected to the compensation module 24A 0 connection for outputting a load voltage Vctrl; the operational amplifier OP comprises a normal phase input end, an inverted phase input end and an output end, wherein the normal phase input end is connected with the second path end of the third transistor Q3, the inverted phase input end is connected with the second path end of the first transistor Q1, and the output end is connected with the control end of the fourth transistor Q4; the first end of the first resistor R1 is connected with the second end of the load current detection unit; the first end of the second resistor R2 is connected with the second end of the first resistor R1, and the second end is connected with the ground end GND; the first end of the output capacitor Cout is connected to the second end of the load current detecting unit, and the second end is connected to the ground GND. The first resistor R1 and the second resistor R2 are connected in series, and a connection midpoint of the two resistors is connected to a first input terminal of the error amplifier gm in the control module 120 for providing the feedback voltage signal Vfb.
In this embodiment, the first transistor Q1 is, for example, a PMOS thyristor, and the second transistor Q2 is an NMOS switch transistor. The control signals output from the two output terminals of the PWM control unit are the same, but since the first transistor Q1 and the second transistor Q2 are turned on at a high level and turned on at a low level, respectively, the first transistor Q1 and the second transistor Q2 are turned on in turn.
Further, the load current detection unit load sense in the voltage output module 230 is located between the second path terminal of the first transistor Q1 and the dc voltage output terminal Vout, and is configured to detect the load current Iload and generate a load voltage Vctrl according to the load current Iload. The value of the load voltage Vctrl output by the load sense unit is:
Vctal＝α*Iload，
where α is a preset parameter, and represents a multiplication operation.
The compensation module 240 includes a first compensation unit (gm 1) 241, a second compensation unit (gm 2) 242, a multiplication unit 243, and a correction unit (Vin plus) 244. The first compensation unit 241 includes a non-inverting input terminal, an inverting input terminal, and an output terminal, where the inverting input terminal is connected to the ground GND, and the output terminal is connected to the second terminal of the sampling capacitor Cramp in the control module 120; the second compensation unit 242 includes a non-inverting input terminal, an inverting input terminal, and an output terminal, wherein the inverting input terminal is connected to the ground GND, and the output terminal is connected to the output terminal of the first compensation unit 241; the multiplication unit 243 includes two input terminals and an output terminal, a first input terminal thereof is connected to the dc voltage input terminal Vin, a second input terminal thereof is connected to a third terminal of the load sense of the load current detection unit in the voltage output module 230, and is used for receiving the load voltage Vctrl, and an output terminal thereof is connected to a non-inverting input terminal of the second compensation unit 242; the first terminal of the correction unit (Vin plus) 244 is connected to the dc voltage input terminal Vin, and the second terminal is connected to the non-inverting input terminal of the first compensation unit 241.
The multiplication unit 243 is configured to generate an intermediate voltage according to the input voltage Vin and the load voltage Vctrl; a correction unit (Vin plus) 244 for generating a correction amount, which is a variable related to the current dc average value of the input voltage Vin, based on the input voltage Vin; the first compensation unit 241 is configured to output a first compensation current Isink1, and the second compensation unit 242 is configured to output a second compensation current Isink2.
In this embodiment, the structure of the correction unit 244 in the compensation module 240 is schematically shown in fig. 4, and the correction unit 244 includes a filter 2441, a subtractor 2442 and an adder 2443. Specifically, a first end of a filter 2441 is connected to the DC voltage input terminal Vin, and the filter 2441 receives the input voltage Vin and outputs an average value of the input voltage VinA first terminal of a subtractor 2442 is connected to a second terminal of the filter 2441, the subtractor 2442 being adapted to average the input voltage Vin +.>Subtracting, e.g. subtractor 2442 outputs a signal of +.>The adder 2443 includes three terminals, a first terminal connected to the second terminal of the subtractor 2442, a second terminal connected to the DC voltage input terminal Vin, and a third terminal connected to the non-inverting input terminal of the first compensation unit 241 as the second terminal of the whole correction unit 244The signal output by the adder 2443 is, for example
Further, since the correction unit 244 is located between the non-inverting input terminal of the first compensation unit 241 and the dc voltage input terminal Vin, the first compensation current Isink1 outputted from the first compensation unit 241 can be corrected. The correction unit 244 is equivalent to adding a variable related to the current DC average value of the input voltage Vin based on the variation DeltaVin of the input voltage Vin, and for the same output voltage Vout, different input voltages Vin introduce an average value of the input voltage VinThe relevant increment may make the Line-transient perform better. Where Line-transient refers to transient over-voltage or over-current due to abrupt current or voltage changes.
Further, referring to fig. 3, when the input voltage Vin of the voltage adjusting circuit 200 changes and jumps by Δvin, the multiplication unit 243 generates an output voltage vmulipid according to the load voltage Vctrl and the dc voltage Vin, and the value of the output voltage vmulipid is:
Vmultipie＝β*Vctrl*Vin＝α*β*Iload*Vin，
wherein beta is a preset parameter.
The variation ΔIsink of the compensation current Isink finally applied to the reference resistor Rramp outputted by the compensation module 240 is:
therefore, according to the above formula, it can be understood that the part before the plus sign can compensate for the variation of the load current, and the part after the plus sign can compensate for the variation of the average value of the input voltage Vin, so that the value of the peak-to-peak value Vpp of the output voltage Vout can be effectively controlled within 20mV no matter how the load and the input voltage Vin vary in the voltage regulating circuit shown in fig. 3 of the present application. Wherein, the peak-to-peak value Vpp represents the difference between the maximum value and the minimum value of the voltage waveform in one period.
Further, fig. 5a shows the voltage adjustment circuit shown in fig. 3 without the correction unit 244, where the input voltage Vin is 2.9V, 3.4V, and 3.9V, and the peak-to-peak value Vpp of the output voltage Vout is different under different load currents Iload; fig. 5b shows the variation of the peak-to-peak value Vpp of the output voltage Vout in the case of the input voltages Vin of 2.9V, 3.4V and 3.9V and in the case of different load currents Iload in the voltage adjusting circuit 200 shown in fig. 3.
Referring to fig. 5a and 5b, it can be understood that, without the correction unit 244, the structure of only adopting the fixed voltage compensation and the load current compensation is insufficient for the result of different input voltages Vin, and the value of the peak-to-peak Vpp of the output voltage Vout is slightly larger when the voltage value of the input voltage Vin is lower. Compared to the voltage adjusting circuit 100 shown in fig. 1, the voltage adjusting circuit 200 of the embodiment of the present application not only can ensure that the output voltage Vout voltage can quickly respond to the change of the input voltage Vin, but also can meet the requirements of the output voltage Vout for the Specification (SPEC) of the rapid rising (fastline) excitation of the power supply in the TDMA test, and the TDMA test requirements of the AMOLED in various application environments, no matter how the load is.
Further, the application also provides a chip, which comprises the voltage adjusting circuit.
Further, the application also provides electronic equipment, which comprises the chip. Wherein the electronic device comprises a display screen. Smart phones or portable devices.
In the voltage adjusting circuit, the chip and the electronic equipment provided by the application, the normal phase input end of the first compensating unit is connected with the direct current voltage input end through the correcting unit, so that the compensating module can quickly respond as long as the input voltage changes or the average value of the input voltage changes, the compensating current is input into the control module to generate a control signal, and the voltage output module can output stable target voltage according to the control signal without excessive overshoot and undershoot.
Further, the voltage adjusting circuit, the chip and the electronic device further comprise a load current detecting unit in the voltage output module, the load current detecting unit is located between the first transistor and the direct-current voltage output end and can be used for detecting load current and converting the load current into load voltage to be fed back to the compensating module, and the multiplying unit and the second compensating unit in the compensating module are used for receiving the load voltage.
According to the voltage regulating circuit, stable target voltage can be output, the change of input voltage can be responded quickly, and the voltage regulating circuit has the characteristics of reliability and stability.
Embodiments in accordance with the present invention, as described above, are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (11)
1. A voltage regulation circuit comprising:
the voltage input module receives input voltage;
the control module is connected with the voltage input module and generates a control signal according to the input voltage;
the voltage output module is connected with the voltage input module and the control module and outputs target voltage according to the input voltage and the control signal;
the compensation module is connected with the control module and generates compensation current according to the variation of the input voltage,
wherein the compensation module comprises a correction unit which generates a correction amount according to the variation of the input voltage so that the compensation module can generate a compensation current according to the variation of the input voltage, the correction amount is a variable related to the current direct current average value of the input voltage,
the control module receives the compensation current to generate an adjusted control signal.
2. The voltage adjustment circuit according to claim 1, wherein the correction unit includes:
the first end of the filter receives the input voltage, and the second end of the filter outputs the average value of the input voltage;
the first end of the subtracter is connected with the second end of the filter, and the second end outputs a difference value between a constant and the average value of the input voltage;
the adder comprises three ends, the first end is connected with the second end of the subtracter, the second end receives the input voltage, and the third end outputs the sum of the difference value output by the subtracter and the input voltage.
3. The voltage regulation circuit of claim 2, wherein the compensation current is a sum of a first compensation current and a second compensation current.
4. A voltage regulation circuit according to claim 3, wherein the voltage output module comprises:
and the second end of the load current detection unit is connected with the output end of the target voltage, the third end of the load current detection unit is connected with the compensation module, and the load current detection unit is used for determining load current and obtaining load voltage according to the load current.
5. The voltage regulation circuit of claim 4, wherein the compensation module further comprises:
the first compensation unit comprises a normal phase input end, an inversion input end and an output end, wherein the normal phase input end is connected with the output end of the correction unit, the inversion input end is connected with the grounding end, the output end outputs the first compensation current,
the first compensation unit amplifies the output signal of the correction unit to generate the first compensation current.
6. The voltage regulation circuit of claim 5, wherein the compensation module further comprises:
the multiplication unit is connected with the load current detection unit and is used for obtaining an intermediate voltage according to the input voltage and the load voltage;
the second compensation unit comprises a normal phase input end, an opposite phase input end and an output end, wherein the normal phase input end of the second compensation unit is connected with the multiplication unit, the opposite phase input end is grounded, the output end of the second compensation unit is connected with the output end of the first compensation unit, and the second compensation unit generates the second compensation current according to the intermediate voltage.
7. The voltage regulation circuit of claim 1, wherein the voltage input module comprises:
the first end of the input capacitor is connected with the direct-current voltage input end, and the second end of the input capacitor is connected with the grounding end;
and the first end of the inductor is connected with the first end of the input capacitor, and the second end of the inductor is connected with the voltage output module.
8. The voltage regulation circuit of claim 1, wherein the control module comprises:
the error amplifier comprises a normal phase input end, a reverse input end and an output end, wherein the normal phase input end is connected with the voltage output module and is used for receiving a feedback voltage signal, and the reverse input end is connected with the reference voltage input end;
the first end of the reference resistor is connected with the output end of the error amplifier;
the first end of the reference capacitor is connected with the second end of the reference resistor, and the second end of the reference capacitor is connected with the grounding end;
the first end of the current source is connected with the first end of the inductor in the voltage input module;
the first end of the sampling capacitor is connected with the second end of the current source;
the first end of the sampling resistor is connected with the second end of the sampling capacitor, and the second end of the sampling resistor is connected with the grounding end;
the first end of the reset switch is connected with the first end of the sampling capacitor, and the second end of the reset switch is connected with the second end of the sampling capacitor;
the comparator comprises a normal phase input end, an inversion input end and an output end, wherein the normal phase input end is connected with the second end of the current source, and the inversion input end is connected with the output end of the error amplifier;
the trigger comprises a first input end, a second input end and an output end, wherein the first input end of the trigger is connected with the output end of the comparator;
the output end of the oscillator is connected with the second input end of the trigger;
the PWM control unit comprises an input end, a first output end and a second output end, wherein the input end of the PWM control unit is connected with the output end of the trigger, and the first output end and the second output end are both connected with the voltage output module.
9. The voltage regulation circuit of claim 4, wherein the voltage output module further comprises:
the first channel end of the first transistor is connected with the second end of the inductor of the voltage input module, the second channel end of the first transistor is connected with the load current detection unit, and the control end of the first transistor is connected with the second output end of the control module;
the first channel end of the second transistor is connected with the first channel end of the first transistor, the second channel end is connected with the grounding end, and the control end is connected with the first output end of the control module;
a third transistor, wherein a first path end of the third transistor is connected with a first path end of the first transistor, and a control end of the third transistor is connected with a control end of the first transistor;
a fourth transistor, a first path end of which is connected with a second path end of the third transistor, and a second path end of which is connected with an output end of the compensation module;
the operational amplifier comprises a normal phase input end, an inversion input end and an output end, wherein the normal phase input end is connected with the second path end of the third transistor, the inversion input end is connected with the second path end of the first transistor, and the output end is connected with the control end of the fourth transistor;
the first end of the first resistor is connected with the second end of the load current detection unit, and the second end of the first resistor is connected with the control module;
the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is connected with the grounding end;
the first end of the output end capacitor is connected with the first end of the first resistor, the second end is connected with the grounding end,
the second end of the first resistor outputs a feedback voltage signal.
10. A chip comprising a voltage regulation circuit according to any one of claims 1-9.
11. An electronic device comprising the chip of claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311837528.XA CN117873252A (en) | 2023-12-28 | 2023-12-28 | Voltage adjusting circuit, chip and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311837528.XA CN117873252A (en) | 2023-12-28 | 2023-12-28 | Voltage adjusting circuit, chip and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117873252A true CN117873252A (en) | 2024-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311837528.XA Pending CN117873252A (en) | 2023-12-28 | 2023-12-28 | Voltage adjusting circuit, chip and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117873252A (en) |
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2023
- 2023-12-28 CN CN202311837528.XA patent/CN117873252A/en active Pending
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