TWI710204B - Control chip, DC-DC converter and portable electronic device using the DC-DC converter - Google Patents

Abstract

A DC-DC converter capable of accelerating the response of line voltage changes, which performs a voltage comparison operation based on a sum signal and an error integration signal to generate a pulse width modulation signal to convert an input voltage into an output voltage, The error integral signal is generated by performing an integral operation on the difference between a feedback voltage and a reference voltage, and the feedback voltage is generated according to a ratio of the output voltage. The characteristic of the DC-DC converter The sum signal is the sum of a slope compensation signal, a current sense voltage, and an input voltage sense signal, the slope compensation signal is a periodic ramp signal, and the current sense voltage is the sum of a power transmission unit A sensed value of the inductor current, and the input voltage sense signal is generated according to a ratio of the input voltage.

Description

Control chip, DC-DC converter and portable electronic device using the DC-DC converter

The invention relates to a DC-DC converter, in particular to a DC-DC converter capable of accelerating response to line voltage changes.

As electronic products that use DC-DC (direct current-direct current; direct current-direct current) output as their power source are increasingly demanding DC-DC output accuracy and ripple, the corresponding DC-DC load changes instantaneously. Response requirements for load-transient and line-transient changes have also increased. When the DC-DC load current suddenly changes or the input voltage changes suddenly, the DC-DC output voltage ripple should be as small as possible.

Please refer to FIG. 1, which shows a circuit diagram of a conventional DC-DC converter. As shown in FIG. 1, the conventional DC-DC converter has a resistor 11a and a resistor 11b in series to form a voltage divider circuit, an error amplifier 12, a slope compensation unit 13, and a current sensing unit 14. , An adding unit 15, a comparator 16, a driving unit 17, a power transmission unit 18 and an output capacitor 19.

The voltage divider circuit is used to generate a feedback voltage V _FB according to a proportion of an output voltage V _OUT ;

The error amplifier 12 is used to perform an integration operation on a difference signal of the feedback voltage V _FB and a reference voltage V _REF to generate an error integration signal V _EA ;

The slope compensation unit 13 is used to generate a slope compensation signal V _RAMP ;

The current sensing unit 14 is used to generate a current sensing voltage V _S according to an inductor current I _{L of the} power transmission unit 18;

The adding unit 15 is used for generating a sum signal V _SUM according to the sum of the slope compensation signal V _RAMP and the current sensing voltage V _S ;

The comparator 16 is used to perform a voltage comparison operation on the error integration signal V _EA and the sum signal V _SUM to generate a pulse width modulation signal PWM;

The driving unit 17 is used for generating a driving signal V _DRV according to the pulse width modulation signal PWM;

The power transmission unit 18 is used to perform an energy transfer operation driven by the driving signal V _{DRV to} transfer the power of an input voltage V _IN to the output voltage V _OUT , and an inductor current I _L is generated during the energy transfer operation ;as well as

The output capacitor 19 is used to provide a filtering effect on the output voltage V _OUT .

During operation, the conventional DC-DC converter uses the current sensing unit 14 to sample the inductor current _IL flowing through a power transistor (not shown in FIG. 1) in the power transmission unit 18 to obtain current sensing. The voltage V _S ; the slope compensation signal V _RAMP is superimposed on V _S to generate a voltage sum signal V _SUM ; and V _{SUM is} compared with the error integration signal V _EA output by the error amplifier 12 in the voltage control loop to generate a pulse width Modulation signal PWM. In the steady state, the pulse width modulation signal PWM will have a duty cycle D such that the output voltage V _OUT is equal to an expected output voltage V _O , where V _O = (1+R ₁ /R ₂ )*V _REF , R ₁ and R ₂ represent the resistance values of the resistor 11a and the resistor 11b, respectively.

When the level of the input voltage V _IN changes, the duty cycle D of the pulse width modulation signal PWM must be changed accordingly so that the output voltage V _OUT can maintain the expected output voltage V _O.

However, the duty cycle D cannot be accelerated to the expected value due to the effect of the integrator circuit of the error amplifier 12, resulting in the output voltage V _OUT jittering, and the slower the duty cycle D changes, the output voltage V _OUT The greater the jitter.

In order to solve the above-mentioned problems, there is an urgent need in the art for a DC-DC converter that can accelerate the response to line voltage changes.

An object of the present invention is to provide a DC-DC converter, which can accelerate the adjustment of the duty cycle of the pulse width modulation signal by incorporating the variation of the input voltage into the determinant factor of the pulse width modulation signal, thereby in addition to making the output In addition to maintaining the expected voltage, the ripple of the output voltage can also remain unchanged.

Another object of the present invention is to provide a portable electronic device, which can choose one of two voltage sources with different voltages as a power supply source, and can use a DC-DC converter that can accelerate the reaction of line voltage changes Accelerate the adjustment of the duty cycle of the pulse modulation signal to keep the output voltage at the expected voltage and the ripple of the output voltage when the voltage source is switched, so as to ensure the stable operation of the information processing unit in the portable electronic device.

In order to achieve the aforementioned purpose, a DC-DC converter that can accelerate the response of line voltage changes is proposed. It has a control circuit to perform a DC-DC conversion operation. The DC-DC conversion operation is based on a summing signal and An error integration signal performs a voltage comparison operation to generate a pulse width modulation signal to convert an input voltage into an output voltage, wherein the error integration signal is performed by comparing a difference between a feedback voltage and a reference voltage It is generated by an integral operation, and the feedback voltage is generated according to a ratio of the output voltage. The characteristics of the DC-DC conversion operation are:

The sum signal is the sum of a slope compensation signal, a current sensing voltage and an input voltage sensing signal, the slope compensation signal is a periodic ramp signal, and the current sensing voltage is an inductance of a power transmission unit The sensing value of the current, and the input voltage sensing signal is generated according to a ratio of the input voltage.

In one embodiment, the DC-DC converter capable of accelerating response to line voltage changes has a combined unit to generate the sum signal according to the sum of the slope compensation signal, the current sensing voltage, and the input voltage sensing signal .

In an embodiment, the combination unit has:

A slope compensation unit for generating the slope compensation signal;

A current sensing unit for generating the current sensing voltage according to the inductor current of the power transmission unit;

An input voltage sensing unit for generating the input voltage sensing signal according to a ratio of the input voltage; and

An addition unit is used to generate the sum signal according to the sum of the slope compensation signal, the current sensing voltage and the input voltage sensing signal.

In an embodiment, the combination unit is realized by an adding circuit, and the adding circuit has:

A transconductance amplifier having a positive input terminal, a negative input terminal and an output terminal, the positive input terminal is coupled to the input voltage, and the negative input terminal is coupled to a reference ground;

A current source, powered by a DC voltage to output a certain current;

A capacitor, the upper electrode of which is coupled to the current source and used to provide the summing signal, and the lower electrode is coupled to the output terminal of the transconductance amplifier and the power transmission unit to receive the transconductance amplifier respectively An output current and the inductor current flowing out of the power transmission unit;

A switch connected in parallel with the capacitor; and

A resistor is coupled between the bottom electrode of the capacitor and the reference ground.

In an embodiment, the combination unit is realized by an adding circuit, and the adding circuit has:

A transconductance amplifier having a positive input terminal, a negative input terminal and an output terminal, the positive input terminal is coupled to the input voltage, and the negative input terminal is coupled to a reference ground;

A capacitor, the upper electrode of which is used to provide the summing signal, and the lower electrode is coupled to the output terminal of the transconductance amplifier and the power transmission unit to respectively receive an output current of the transconductance amplifier and flow out the power The inductance current of the transmission unit;

A first switch connected in parallel with the capacitor;

A resistor, coupled between the bottom electrode of the capacitor and the reference ground;

A second switch coupled between the upper electrode of the capacitor and a bias voltage; and

A current source is coupled between the upper electrode of the capacitor and the reference ground to provide a discharge current to the capacitor.

In order to achieve the aforementioned objective, the present invention further provides a control chip having the aforementioned control circuit.

In order to achieve the foregoing objective, the present invention further provides a portable electronic device having the aforementioned DC-DC converter and an information processing unit capable of accelerating the response line voltage change, wherein the DC-DC converter is Used to provide the output voltage to power the information processing unit.

In possible embodiments, the portable electronic device can be a portable computer or a handheld smart device.

The principle that the output voltage of the DC-DC converter of the present invention can accelerate the level change of the response input voltage is that the present invention incorporates the variation of the input voltage into the determining factor of the pulse width modulation signal, and accordingly, when the input voltage changes from When a first level is changed to a second level, the change of the input voltage will drive the pulse width modulation signal to accelerate to change its duty cycle, and in the steady state, the change of the slope compensation signal and the current sensing voltage The sum of the changes will have a zero-sum relationship with the change of the input voltage, so that the output level of the error amplifier remains unchanged, even if the ripple of the output voltage does not change.

Please refer to FIG. 2, which is a circuit diagram of an embodiment of the DC-DC converter capable of accelerating response to line voltage changes according to the present invention. As shown in FIG. 2, the DC-DC converter has a feedback circuit 101, an error amplifier 102, a combination unit 103, a comparator 104, a driving unit 105, a power transmission unit 106, and an output capacitor 107. , The combination unit 103 has a slope compensation unit 103a, a current sensing unit 103b, an input voltage sensing unit 103c, and an addition unit 103d, wherein the error amplifier 102, the combination unit 103, the comparator 104, and the driving unit 105 constitute one The control circuit performs a DC-DC conversion operation, and the combination unit 103 has a slope compensation unit 103a, a current sensing unit 103b, an input voltage sensing unit 103c, and an adding unit 103d.

The feedback circuit 101 is used to generate a feedback voltage V _FB according to a ratio of an output voltage V _OUT ;

The error amplifier 102 is used to perform an integration operation on a difference signal of the feedback voltage V _FB and a reference voltage (not shown in FIG. 2) to generate an error integration signal V _EA ;

The slope compensation unit 103a is used to generate a slope compensation signal V _RAMP ;

The current sensing unit 103b is used to generate a current sensing voltage V _S according to an inductor current _{IL of the} power transmission unit 106;

The input voltage sensing unit 103c is used to generate an input voltage sensing signal V _INS according to a ratio of an input voltage V _IN ;

The adding unit 103d is used to generate a sum signal V _SUM according to the sum of the slope compensation signal V _RAMP , the current sensing voltage V _S and the input voltage sensing signal V _INS ;

The comparator 104 is used to perform a voltage comparison operation on the error integration signal V _EA and the sum signal V _SUM to generate a pulse width modulation signal PWM;

The driving unit 105 is used for generating a driving signal V _DRV according to the pulse width modulation signal PWM;

The power transmission unit 106 is used to perform an energy transfer operation driven by the driving signal V _{DRV to} transfer the power of the input voltage V _IN to the output voltage V _OUT , and an inductor current I _L is generated during the energy transfer operation; as well as

The output capacitor 107 is used to provide a filtering effect on the output voltage V _OUT .

In operation, the DC-DC conversion operation of the present invention uses the current sensing unit 103b to sample the inductor current _IL flowing through a power transistor (not shown in FIG. 2) in the power transmission unit 106 to obtain the current Sense voltage V _S ; superimpose the slope compensation signal V _RAMP on V _S and then add the level of the input voltage sensing signal V _INS to generate the sum signal V _SUM ; and combine the error integration signal V _EA and the sum signal V _SUM is compared to generate a pulse width modulation signal PWM. In the steady state, the pulse width modulation signal PWM will have a duty cycle D such that the output voltage V _OUT is equal to an expected output voltage V _O , where V _O = (1+R ₁ /R ₂ )*V _REF , R ₁ and R ₂ respectively represent the resistance values of the two voltage dividers in the feedback circuit 101, and V _REF represents the reference voltage inside the error amplifier 102.

When the level of the input voltage V _IN changes, the duty cycle D of the pulse width modulation signal PWM must be changed accordingly so that the output voltage V _OUT can maintain the expected output voltage V _O. In order to keep the ripple of the output voltage V _OUT constant, the change of the duty cycle D cannot be driven by the error integration signal V _EA . Therefore, in the present invention, the input voltage sensing signal V _INS becomes a level determining factor of the sum signal V _SUM , so as to accelerate the change of the duty cycle D when the level of the input voltage sensing signal V _INS changes. Since the increase/decrease of the duty cycle D will drive the level of the current sensing voltage V _S and the slope compensation signal V _RAMP to rise/fall, the level of the sum signal V _SUM will rise/fall, and the sum signal The rise/fall of V _SUM level will decrease/increase the duty cycle D. According to this negative feedback mechanism, the duty cycle D can reach a corresponding value at an accelerated rate, so that the error integration signal V _EA remains unchanged, that is, the ripple of the output voltage V _OUT remains unchanged. The output voltage V _OUT maintains the expected output voltage V _O. Please refer to FIG. 3, which is a circuit diagram of a detailed embodiment of the DC-DC converter capable of accelerating response to line voltage changes in FIG. As shown in FIG. 3, the feedback circuit 101 has a first resistor 101a and a second resistor 101b in series configuration; the error amplifier 102 is composed of an integrating amplifier 102a with a resistor-capacitor low-pass network inside The equivalent circuit of the slope compensation unit 103a, the current sensing unit 103b, the input voltage sensing unit 103c and the addition unit 103d in the combination unit 103 can be a transconductance amplifier 103e, a current source 103f, a capacitor 103g, and a switch 103h And a resistor 103i.

The transconductance amplifier 103e has a positive input terminal, a negative input terminal, and an output terminal, the positive input terminal is coupled to the input voltage V _IN , the negative input terminal is coupled to a reference ground, and the output terminal is coupled to The electrode is coupled under the capacitor 103g;

The current source 103f is powered by a DC voltage to output a certain current;

The upper electrode of the capacitor 103g is coupled to the current source 103f and used to provide the sum signal V _SUM , and the lower electrode is coupled to the power transmission unit 106 to receive the inductance current I _L flowing out of the power transmission unit 106;

The switch 103h is connected in parallel with the capacitor 103g; and

The resistor 103i is coupled between the lower electrode of the capacitor 103g and the reference ground.

In the circuit of Figure 3, the current source 103f, the capacitor 103g and the switch 103h are used to generate a periodic ramp signal between the upper and lower electrodes of the capacitor 103g, and the resistor 103i is used to convert the inductor current I _L and The sum of the output current I _VIN (= V _IN *gm) of the conductance amplifier 103e is converted into a voltage signal, so that the sum signal V _SUM is equal to the sum of the ramp signal and the voltage signal.

，則本發明會使占空比D加速地由D ₁變為D ₂。具體而言，在輸入電壓V _IN由V _IN1變為V _IN2時本發明會使加總信號V _SUM立即產生對應的變化，其變化量可表為

，以使占空比D加速地改變，其中gm為轉導放大器103e的跨導，R _COMP為電阻103i的電阻值。當占空比D改變(增加/減少)後，該斜坡信號的準位會因開關103h的導通時間跟著增加/減少而上升/下降，且該電壓信號會跟著上升/下降，致使加總信號V _SUM的準位跟著上升/下降；而當加總信號V _SUM的準位上升/下降時，占空比D會減少/增加。依此，本發明即可在輸入電壓V _IN由V _IN1變為V _IN2時，在不改變誤差積分信號V _EA的準位的情況下使占空比D加速地由D ₁變為D ₂。也就是說，本發明的PWM信號產生機制能夠在使輸出電壓V _OUT的漣波保持不變的情況下加速反應輸入電壓V _IN的準位變化，從而使輸出電壓V _OUT維持預期的準位。 During operation, if the input voltage V _IN changes from V _IN1 to V _IN2 , that is to say

, The present invention will accelerate the duty cycle D from D ₁ to D ₂ . Specifically, when the input voltage V _IN changes from V _IN1 to V _IN2 , the present invention will cause the summing signal V _{SUM to} immediately produce a corresponding change, and the amount of change can be expressed as

, In order to accelerate the change of the duty cycle D, where gm is the transconductance of the transconductance amplifier 103e, and R _COMP is the resistance value of the resistor 103i. When the duty cycle D changes (increases/decreases), the level of the ramp signal will increase/decrease due to the increase/decrease of the on time of the switch 103h, and the voltage signal will increase/decrease, resulting in the sum signal V _{The level of SUM} rises/falls accordingly; and when the level of the sum signal V _SUM rises/falls, the duty cycle D will decrease/increase. Accordingly, the present invention can accelerate the duty cycle D from D ₁ to D ₂ without changing the level of the error integration signal V _EA when the input voltage V _IN changes from V _IN1 to V _IN2 . That is to say, the PWM signal generation mechanism of the present invention can accelerate the response to the level change of the input voltage V _IN while keeping the ripple of the output voltage V _OUT constant, so that the output voltage V _{OUT can} maintain the expected level.

Please refer to FIG. 4, which is a circuit diagram of another detailed embodiment of the DC-DC converter capable of accelerating response to line voltage changes in FIG. As shown in FIG. 4, the feedback circuit 101 has a first resistor 101a and a second resistor 101b in series configuration; the error amplifier 102 is composed of an integrating amplifier 102a with a resistor-capacitor low-pass network inside. The equivalent circuit of the slope compensation unit 103a, the current sensing unit 103b, the input voltage sensing unit 103c and the addition unit 103d in the combination unit 103 can be a transconductance amplifier 103e, a capacitor 103g, a switch 103h, a resistor 103i, A switch 103j and a current source 103k are formed.

The transconductance amplifier 103e has a positive input terminal, a negative input terminal, and an output terminal, the positive input terminal is coupled to the input voltage V _IN , the negative input terminal is coupled to a reference ground, and the output terminal is coupled to The electrode is coupled under the capacitor 103g;

The upper electrode of the capacitor 103g is used to provide the sum signal V _SUM , and the lower electrode is coupled to the power transmission unit 106 to receive the inductance current I _L flowing out of the power transmission unit 106;

The switch 103h is connected in parallel with the capacitor 103g;

The resistor 103i is coupled between the lower electrode of the capacitor 103g and the reference ground;

The switch 103j is coupled between the upper electrode of the capacitor 103g and a bias voltage V _B ; and

The current source 103k is coupled between the upper electrode of the capacitor 103g and the reference ground to provide a discharge current to the capacitor 103g.

In the circuit of Figure 4, the bias voltage V _B , the capacitor 103g, the switch 103h, the switch 103j, and the current source 103k are used to generate a periodic ramp signal between the upper and lower electrodes of the capacitor 103g, and the resistor 103i is It is used to convert the sum of the inductor current I _L and the output current I _VIN (= V _IN *gm) of the transconductance amplifier 103e into a voltage signal, so that the sum signal V _SUM is equal to the sum of the ramp signal and the voltage signal.

，則本發明會使占空比D加速地由D ₁變為D ₂。具體而言，在輸入電壓V _IN由V _IN1變為V _IN2時本發明會使加總信號V _SUM立即產生對應的變化，其變化量可表為

，以使占空比D加速地改變，其中gm為轉導放大器103e的跨導，R _COMP為電阻103i的電阻值。當占空比D改變(增加/減少)後，該斜坡信號的準位會因開關103h的導通時間跟著增加/減少而上升/下降，且該電壓信號會跟著上升/下降，致使加總信號V _SUM的準位跟著上升/下降；而當加總信號V _SUM的準位上升/下降時，占空比D會減少/增加。依此，本發明即可在輸入電壓V _IN由V _IN1變為V _IN2時，在不改變誤差積分信號V _EA的準位的情況下使占空比D加速地由D ₁變為D ₂。也就是說，本發明的PWM信號產生機制能夠在使輸出電壓V _OUT的漣波保持不變的情況下加速反應輸入電壓V _IN的準位變化，從而使輸出電壓V _OUT維持預期的準位。 During operation, if the input voltage V _IN changes from V _IN1 to V _IN2 , that is to say

, The present invention will accelerate the duty cycle D from D ₁ to D ₂ . Specifically, when the input voltage V _IN changes from V _IN1 to V _IN2 , the present invention will cause the summing signal V _{SUM to} immediately produce a corresponding change, and the amount of change can be expressed as

, In order to accelerate the change of the duty cycle D, where gm is the transconductance of the transconductance amplifier 103e, and R _COMP is the resistance value of the resistor 103i. When the duty cycle D changes (increases/decreases), the level of the ramp signal will increase/decrease due to the increase/decrease of the on time of the switch 103h, and the voltage signal will increase/decrease, resulting in the sum signal V _{The level of SUM} rises/falls accordingly; and when the level of the sum signal V _SUM rises/falls, the duty cycle D will decrease/increase. Accordingly, the present invention can accelerate the duty cycle D from D ₁ to D ₂ without changing the level of the error integration signal V _EA when the input voltage V _IN changes from V _IN1 to V _IN2 . That is to say, the PWM signal generation mechanism of the present invention can accelerate the response to the level change of the input voltage V _IN while keeping the ripple of the output voltage V _OUT constant, so that the output voltage V _{OUT can} maintain the expected level.

Please refer to FIG. 5, which is a comparison diagram of operating waveforms of a DC-DC converter and a conventional DC-DC converter according to the technical scheme of the present invention. As shown in FIG. 5, the ripple of the output voltage of the present invention is significantly smaller than that of the conventional DC-DC converter.

According to the above description, the present invention can integrate the above-mentioned control circuit into a control chip, and in possible embodiments, the control chip can further integrate the power transistor in the power transmission unit 106.

Based on the above description, the present invention further provides a portable electronic device. Please refer to FIG. 6, which is a block diagram of an embodiment of the portable electronic device of the present invention. As shown in FIG. 6, a portable electronic device 200 has a DC-DC converter 210 and an information processing unit 220. The DC-DC converter 210 is implemented by the aforementioned DC-DC converter to supply power to the information processing. Unit 220, DC-DC converter 210 can convert two different levels of input voltage (V _IN1 , V _IN2 ) into an output voltage V _OUT , and during the process of switching the level of the input voltage (controlled by switch 211) , The ripple of the output voltage V _OUT can be maintained within a predetermined range. The input voltages of the two different levels can be two battery voltages or a battery voltage and a DC output voltage of an AC-DC converter respectively.

In addition, the portable electronic device 200 can be a portable computer or a handheld smart device.

According to the above description, the present invention can provide the following advantages:

1. The DC-DC converter of the present invention can accelerate the adjustment of the duty cycle of the pulse width modulation signal by incorporating the variation of the input voltage into the determining factor of the pulse width modulation signal, so as to maintain the expected voltage of the output voltage In addition, the ripple of the output voltage can also remain unchanged.

2. The portable electronic device of the present invention can choose one of two voltage sources with different voltages as the power supply source, and can accelerate the adjustment of the pulse modulation signal by a DC-DC converter that can accelerate the response to line voltage changes The duty cycle is to keep the output voltage at the expected voltage and the ripple of the output voltage when the voltage source is switched, so as to ensure the stable operation of the information processing unit in the portable electronic device.

The disclosure of the present invention is one of the preferred embodiments, and any partial changes or modifications that are derived from the technical ideas of the present invention and are easily inferred by those skilled in the art will not depart from the scope of the patent right of the present invention.

In summary, regardless of the purpose, means and effect of this case, it is shown that it is very different from the conventional technology, and its first invention is suitable for practicality, and it does meet the patent requirements of the invention. I implore the examiner to investigate and grant the patent as soon as possible. Society is for the best prayer.

11a: Resistance

11b: Resistance

12: Error amplifier

13: Slope compensation unit

14: Current sensing unit

15: addition unit

16: comparator

17: drive unit

18: Power transmission unit

19: output capacitor

101: feedback circuit

102: Error amplifier

102a: Integrating amplifier

103: combination unit

103a: Slope compensation unit

103b: Current sensing unit

103c: Input voltage sensing unit

103d: addition unit

103e: Transconductance amplifier

103f: current source

103g: capacitance

103h: switch

103i: resistance

103j: switch

103k: current source

104: Comparator

105: drive unit

106: Power Transmission Unit

107: output capacitor

200: Portable electronic device

210: DC-DC converter

211: Switch

220: Information Processing Unit

Figure 1 shows a circuit diagram of a conventional DC-DC converter. Fig. 2 is a circuit diagram of an embodiment of the DC-DC converter capable of accelerating response to line voltage changes according to the present invention. 3 is a circuit diagram of a detailed embodiment of the DC-DC converter capable of accelerating response to line voltage changes in FIG. 2. 4 is a circuit diagram of another detailed embodiment of the DC-DC converter capable of accelerating response to line voltage changes in FIG. 2. FIG. 5 is a comparison diagram of operating waveforms of a DC-DC converter and a conventional DC-DC converter implemented according to the technical scheme of the present invention. FIG. 6 is a block diagram of an embodiment of the portable electronic device of the present invention.

101: feedback circuit

102: Error amplifier

103: combination unit

103a: Slope compensation unit

103b: Current sensing unit

103c: Input voltage sensing unit

103d: addition unit

104: Comparator

105: drive unit

106: Power Transmission Unit

107: output capacitor

Claims (7)

A DC-DC converter capable of accelerating response to line voltage changes has a control circuit to perform a DC-DC conversion operation. The DC-DC conversion operation performs a voltage comparison operation based on a sum signal and an error integral signal. A pulse width modulation signal is generated to convert an input voltage into an output voltage, wherein the error integration signal is generated by performing an integration operation on a difference between a feedback voltage and a reference voltage, and the feedback The voltage is generated according to a ratio of the output voltage. The DC-DC conversion operation is characterized in that the sum signal is the sum of a slope compensation signal, a current sensing voltage, and an input voltage sensing signal. The slope compensation signal Is a periodic ramp signal, the current sensing voltage is a sensing value of an inductor current of a power transmission unit, and the input voltage sensing signal is generated according to a proportion of the input voltage; wherein the control circuit has a The combination unit generates the sum signal according to the sum of the slope compensation signal, the current sensing voltage, and the input voltage sensing signal. The DC-DC converter capable of accelerating response to line voltage changes as described in item 1 of the scope of patent application, wherein the combination unit has: a slope compensation unit for generating the slope compensation signal; a current sensing unit, For generating the current sensing voltage according to the inductor current of the power transmission unit; an input voltage sensing unit for generating the input voltage sensing signal according to a ratio of the input voltage; and an adding unit for The sum signal is generated according to the sum of the slope compensation signal, the current sensing voltage and the input voltage sensing signal. As described in item 1 of the scope of patent application, the DC-DC converter capable of accelerating the reaction of line voltage changes, wherein the combination unit is realized by an adding circuit, and the adding circuit has: a transconductance amplifier with A positive input terminal, a negative input terminal and an output terminal, the positive input terminal is coupled to the input voltage, and the negative input terminal is coupled to a reference ground; A current source is powered by a DC voltage to output a certain current; a capacitor, the upper electrode of which is coupled to the current source and is used to provide the summing signal, and the lower electrode is connected to the output of the transconductance amplifier Terminal and the power transmission unit are coupled to respectively receive an output current of the transconductance amplifier and the inductive current flowing out of the power transmission unit; a switch connected in parallel with the capacitor; and a resistor coupled to the capacitor Between the lower electrode and the reference ground. As described in item 1 of the scope of patent application, the DC-DC converter capable of accelerating the reaction of line voltage changes, wherein the combination unit is realized by an adding circuit, and the adding circuit has: a transconductance amplifier with A positive input terminal, a negative input terminal and an output terminal, the positive input terminal is coupled to the input voltage, and the negative input terminal is coupled to a reference ground; a capacitor, the upper electrode is used to provide the To sum the signal, the lower electrode is coupled to the output terminal of the transconductance amplifier and the power transmission unit to respectively receive an output current of the transconductance amplifier and the inductive current flowing out of the power transmission unit; a first A switch is connected in parallel with the capacitor; a resistor is coupled between the lower electrode of the capacitor and the reference ground; a second switch is coupled between the upper electrode of the capacitor and a bias voltage And a current source coupled between the upper electrode of the capacitor and the reference ground to provide a discharge current to the capacitor. A control chip having the control circuit described in any one of items 1 to 4 in the scope of patent application. A portable electronic device having a DC-DC converter capable of accelerating response to line voltage changes and an information processing unit as described in any one of items 1 to 4 in the scope of patent application, wherein the DC-DC The converter is used to provide the output voltage to power the information processing unit. The portable electronic device described in item 6 of the scope of the patent application is a portable computer or a handheld smart device.

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